Journal of Power Electronics & Power Systems
Journal of Power Electronics & Power Systems (JoPEPS) is an international e-Journal focused towards the publication of research finding papers in the areas of Power Electronics & Power Systems. Focus and Scope Covers Power Transmission, Distribution and Generation Power Electronics and Communication Electric Machinery and Power Engineering Systems Energy Management Systems Energy Systems Modeling & Simulation Energy Development Supervisory Control
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Photovoltaic System Based Modified SEPIC Converter with Perturb and Observe Algorithm
In recent years, because of the increasing demand of the electrical energy, the solar energy has been considered as one of principal renewable energy sources for electric power generation. As it has low power efficiency; to increase the extracted power from PV system is a matter of concern. To extract maximum power, a maximum power point tracking (MPPT) controller is necessary in a PV system. In this paper, a PV fed high static gain step-up dc-dc converter based on the modified SEPIC converter with magnetic coupling is presented. By employing some modifications in classical SEPIC converter, the static gain of proposed converters increased considerably up to 20 times. The MATLAB simulation model is developed with PV MPPT fed modified SEPIC with magnetic coupling and output diode clamping. The result shows that the proposed topologies of converters provide low switch voltage, low output diode voltage and immunize reverse recovery current. With the proposed topologies, the static gain of the converter is increased as well as the efficiency of converter is increased up to about 92%. Keywords: DC-DC power conversion, photovoltaic (PV), maximum power point tracking (MPPT), voltage multiplier, solar power generation Cite this Article Patwardhan JE, Maheshwari RM. Photovoltaic System Based on Modified SEPIC Converter with Perturb and Observe Algorithm. Journal of Power Electronics & Power Systems. 2017; 7(2): 33–41p.
The Electromagnetic Transients in Mixed Power Networks with Partial Undergrounding
<!--[if gte mso 9]><xml> <o:OfficeDocumentSettings> <o:RelyOnVML /> <o:AllowPNG /> </o:OfficeDocumentSettings> </xml><![endif]--> This paper deals with the electromagnetic transients in partially undergrounded mixed high voltage power networks. These networks can include several cable sections replacing parts of the overhead transmission lines. The analysis yields the transient voltage and current distributions along the normal and the partially undergrounded lines. Moreover, the results can indicate eventually existing localized voltage and current concentrations within the network. The study suggests an exact direct analytical distributed parameter approach for modeling the transmission lines and cable sections. Instead of representing the partially undergrounded line by the cascade connection of several two-port circuits, this paper proposes the use of a single equivalent nonuniform transmission line. The non-uniform circuit parameters are represented by means of several step functions in terms of the co-ordinates along the lines under investigation. The resulting expressions are substituted in the simultaneous voltage and current differential equations, for which direct and exact analytical solutions are available in terms of Mathematica parametric functions. The resulting Laplace s-domain voltage and current expressions will then be numerically inverted using the Hosono algorithm. The results of several case studies in which the transients are initiated by sources of step-function or double-exponential waveforms are presented and discussed. The impact of the partial undergrounding on the wave reflections and the matching conditions is also demonstrated. 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A Review on Cascade Tripping and Islanding Scheme
Large black outs typically involve sophisticated and cascading chains of events. Giant blackout though sporadic, is expensive to society with estimates of direct prices up to billions of bucks. There also are indirect prices like attainable social disruptions and also the propagation of failures into different infrastructures like communications, water system, fossil fuel and transportation. The very important importance of electrical power to our society motivates continuing attention to maintaining installation stability and developing new strategies to manage the chance of cascading blackouts. If the system is operated securely, such events do not lead to loss of load or instability. Islanding scheme is used as prevention against such large cascading failures. Keywords: Cascade tripping, islanding, stability analysis Cite this Article Supriya Rakshit, Mitali Pathak. A Review on Cascade Tripping and Islanding Scheme. Journal of Power Electronics & Power Systems. 2017; 7(2): 24–27p.
Extended Switched Inductor Quasi Z Source Inverter for Photovoltaic Applications
<!--[if gte mso 9]><xml> <o:OfficeDocumentSettings> <o:RelyOnVML /> <o:AllowPNG /> </o:OfficeDocumentSettings> </xml><![endif]--> A novel extended switched inductor quasi Z source inverter is proposed in this paper for better voltage boosting with improved power factor and reliability. The operation of the proposed inverter is described with its equivalent circuit explaining operating states such as shoot through and non-shoot through states and outlining the relationship between output voltage, total harmonic distortion and power factor. Simple boost scheme is used for switching actions of the inverter. Simulation and experimental results are presented to illustrate the performance of the proposed inverter topology. The proposed inverter has reduced voltage stress on the passive elements and better inversion ability and it can be used for photovoltaic applications. Keywords: Switched inductor quasi Z source network, Z source inverter, extension, voltage boosting ability, capacitor voltage stress, power factor improvement Cite this Article V.Saravanan, M. Aravindan, V. Balaji. Extended Switched Inductor Quasi Z Source Inverter for Photovoltaic Applications. 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Paper Battery for Portable Electronics: A Review
This paper depicts about paper battery. A paper battery is an adaptable, ultrathin vitality stockpiling and generation gadget framed by consolidating Carbon Nanotubes with a customary sheet of cellulose based paper. A paper battery can work both as a high vitality battery and super capacitor. The battery produces power similarly as the traditional lithium-particle batteries however every one of the segments has been consolidated into a light weight adaptable sheet of paper. The gadgets are shaped by joining cellulose with an imbuement of adjusted carbon nanotubes. They are biodegradable, light weight and non-harmful in nature and have potential versatility to control up and coming era of gadgets, therapeutic gadgets and half breed vehicles. The target of composing the paper is to comprehend and break down the properties and qualities of Paper Batteries; to consider its points of interest, potential applications, confinements and impediments. This paper also scrutinizes the construction and numerous approaches of production of paper battery. Keywords: Biodegradable, carbon nanotubes, cellulose, paper battery, hybrid vehicles, super capacitor Cite this Article Amit Sharma, Akanksha, Kumari Charu Bhatia, et al. Paper Battery for Portable Electronics: A Review. Journal of Power Electronics & Power Systems. 2017; 7(2): 28–32p.
Design and Simulation of Z-Source Inverter Fed Brushless DC Motor Drive Supplied With Fuel Cell for Automotive Applications
<!--[if gte mso 9]><xml> <o:OfficeDocumentSettings> <o:RelyOnVML /> <o:AllowPNG /> </o:OfficeDocumentSettings> </xml><![endif]--> This paper presents design and simulation of Z-source inverter fed brushless DC motor drive supplied with fuel cell for automotive applications. The brushless DC (BLDC) motor are used due to many advantages such as high efficiency, high torque, high reliability, high-power density, lower maintenance compared to other motors in electric transport applications. The BLDC motor drive is with voltage source inverter (VSI) or current source inverter (CSI) because of low efficiency, high thermal loss, and inductor and capacitor large values inherently unreliable. Also shoot-through in DC bus in VSI and open circuit in DC link in CSI causes damage to the power source connected to the inverter, such as fuel cells, solar cells or the battery. In VSI and CSI are for increasing and decreasing the output voltage needs to separate DC-DC Buck and Boost converter. But their disadvantages have been overcome in the Z-source inverter using two inductors and capacitors. Also the Z-source inverter has inherent protection against shoot-through in the DC bus and boost voltage ability. In this paper the BLDC motor drive supplied to the fuel cell via a Z-source inverter are designed and evaluated. The simulation results show that the output voltage of fuel cell less can be settled in desired zone with changing capacitors and inductors and operating duty cycle. Keywords: Brushless DC motor (BLDC), impedance source inverter (ZSI), fuel cell, Shoot-through duty cycle, conventional inverter Cite this Article Mohsen Teimoori, Sayyed Hossein Edjtahed, Abolfazl Halvaei Niasar et al. Design and Simulation of Z-Source Inverter Fed Brushless DC Motor Drive Supplied With Fuel Cell for Automotive Applications. 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Application of Accelerated PSO and ANN for optimal Scheduling of Hydrothermal System
A short range problem of hydrothermal scheduling of hydrothermal system with cascaded is analyzed in this paper. The net head, water discharge rate and water transport delay between connected reservoirs is considered in the problem. The developed algorithm is demonstrated on a test system consisting one thermal plant and four cascaded hydro plants. The results obtained by the APSO technique are compared to PSO and conventional technique. It is found that result obtained by APSO approach is superior in term of fuel cost and lesser computational time. The results of PSO, APSO and conventional technique are taking as inputs for the training to ANN system. ANN provides better result as comparison of PSO, APSO and conventional technique. Keywords: Hydrothermal scheduling, Particle Swarm Optimization, Artificial Neural Network, Accelerated Particle Swarm Optimization Cite this Article Gupta SK, Manisha Malik, Diksha Gupta. Application of Accelerated PSO and ANN for optimal Scheduling of Hydrothermal System. Journal of Power Electronics and Power Systems. 2016; 6(3): 42–52p.
Performance Evaluation of Brushless DC Motor during Sinusoidal and Trapezoidal Back-EMF Waveform
Due to increasing popularity and wide application in the drive system BLDC motor is widely used. An undesirable signal in the brushless dc motor is a ripple in torque, which is in challenging motor control and some machine tools. This article represents the performance evolution of BLDC motor by using the sinusoidal and trapezoidal back EMF waveform for getting the efficient operation of BLDC motor drives. In sinusoidal back EMF waveform requires sinusoidal flux density; it also requires the high-resolution rotor position sensors. In trapezoidal back EMF waveform, it requires lower resolution sensor. Non-ideal properties of any source causes either phase current or back EMF waveform to depart from their entirely sinusoidal waves, which will typically give rise to an undesired pulsating torque components. In current waveform actually, inverter contribute to the torque ripple owing to the time harmonics. BLDC motor is an actually electronic commutated motor. Torque control is accomplished by challenging the back EMF waveform. BLDC motor is powered by the semiconductor devices such that MOSFET. The corresponding results have been comparing using MATLAB/ SIMULINK. Keywords: BLDC motor, stator current, rotor angle, rotor position, ripple torque, stator back EMF and hall effect signals Cite this Article Rima M. Pujara, C.K. Vibhakar. Performance Evaluation of Brushless DC Motor During Sinusoidal and Trapezoidal Back-EMF Waveform. Journal of Power Electronics and Power Systems. 2016; 6(3): 14–22p.
Design of a Closed Loop Boost Converter with Parametric Variation Analysis of PI Controller for Constant Output Voltage Applications
The DC-DC converters have an unregulated input dc voltage and a constant or regulated output dc voltage. Switching DC-DC voltage converters have two elements: A controller and a power stage. The power stage regulates the switching elements and converts input voltage to output voltage. The controller controls the switching operation to regulate the output voltage. The two systems are linked by a feedback loop that compares the actual output voltage with the desired output to derive the error voltage. This paper will focus on modeling, analysis, design and simulation of DC-DC boost converter architecture and will present an optimized controller for constant voltage applications. The constant output applications have been established by using pulse width modulation (PWM) with a proportional-integral (PI) controller. PI Controller is the most widely used controller in various industrial & technological applications. Here, trial and error method is used to set the controller parameters & to get constant outputs. The calculations of the boost converter have been examined through simulation results using MATLAB Simulink. Keywords: Boost converter, duty cycle, PI controller, PWM Generator (DC-DC), trial & error method Cite this Article Shetu Roy, Mohammad Abdul Mannan. Design of a Closed Loop Boost Converter with Parametric Variation Analysis of PI Controller for Constant Output Voltage Applications. Journal of Power Electronics and Power Systems. 2016; 6(3): 1–13p.
Power Control of Doubly Fed Induction Generator (DFIG) Based on IP Controller
Conventionally, the indirect power control of Doubly Fed Induction Generator (DFIG) has been developed based on conventional Proportional-Plus-Integral (PI) controller due to its simple construction and implementation. The steady-state error minimization, overshoot elimination and disturbance rejection are not possible where the gains of PI controller are chosen by trial and error method. The steady-state error and disturbance rejection can be possible if the gains of PI controller are chosen by proper choosing of poles. But the overshoot elimination is not possible where PI based control is designed. In this paper, Integral-Plus-Proportional (IP) controller is proposed to design for power control of the DFIG. The IP controller is well suited to minimized the overshoot problem which is arisen in PI controller. The performance of proposed IP controller for power control of the DFIG system is analyzed and investigated through the simulation work. The results of simulation works are presented to demonstrate the effectiveness of propose IP controller compared with conventional PI controller. The proposed IP controller shows the superior performance over PI controller in terms of minimization of overshoot. Keywords: Stator flux orientation control, Active and reactive power control, PI controller, IP controller, Doubly fed induction generator Cite this Article A.K.M Rejwanul Haque, Mohammad Abdul Mannan, Junji Tamura. Power Control of Doubly Fed Induction Generator (DFIG) Based on IP Controller. Journal of Power Electronics and Power Systems. 2016; 6(3): 23–32p.
Evaluation Algorithm for Discrimination between Fault and Power Swing Using Independent Component Analysis
The analysis of faults and disturbances in power systems is a basic requirement for a secure and reliable electrical power supply. Independent component analysis (ICA) is an efficient computational method used to find out hidden components in a set of sampled data. The basic target of ICA is to find a linear representation and relation between nongaussian data captured during disturbance, so that the components are statistically independent, or as independent as possible. This paper explains the application of ICA as an abrupt change detection technology to detect the abrupt changes in segmented current and voltage signals, which are recorded during fault or disturbance. Also show how the detected abrupt change in signal segment is discriminated in fault and power swing. Keywords: Distance protection, Abrupt change detection, Power Swing, Disturbance analysis, Relay performance Cite this Article Upadhyay VJ, Pandya AS. Evaluation Algorithm for Discrimination between Fault and Power Swing Using Independent Component Analysis. Journal of Power Electronics and Power Systems. 2016; 6(3): 53–59p.
The Frequency Characteristics of Transformer Windings Considering the Separation-Dependence of the Inter-Turn Mutual Parameters
The paper presents a direct method for the determination of the frequency characteristics of transformer windings. The dependence of both the inter-turn mutual inductances and capacitances on the separation between these winding turns is taken into consideration. From measured data available in the literature, a formula for this dependence is derived. The voltage and current distributions along the winding will be governed by two integro-differential equations in terms of the location along the winding and the frequency. A direct solution of these equations will be presented. It doesn’t require any numerical iterative techniques or finite difference analyses. The frequency response, including the series and parallel resonance frequencies as well as the winding’s frequency-dependent input impedance for sample case studies are presented and discussed. Different transformer’s neutral treatments are addressed. These results are compared with the corresponding ones ignoring the non-uniformity of the mutual elements. In order to validate the proposed method, the paper is concluded by addressing special cases with known exact solutions. Keywords: Power transformers, winding, modeling, distributed parameter circuits, non-uniform, frequency response, resonance, impedance characteristics, mutual parameters, integro-differential equations Cite this Article Mohamed M. Saied. The Frequency Characteristics of Transformer Windings Considering the Separation-Dependence of the Inter-Turn Mutual Parameters. Journal of Power Electronics and Power Systems. 2016; 6(3): 72–81p.
A Disaggregated Optimization Approach for Competitive Procurement of Energy and Operating Reserve
In restructured environment, Ancillary Services (AS) plays a vital role, as they are required for reliable and secure operation of the power system. Operating Reserve (OR), as one of the main AS, is a capability of a power system to prevent any unexpected imbalances caused by generation, transmission or equipment outage has been considered in this work. The approach is based on disaggregated clearing of energy and OR, which can support the development of an effective reserve allocation and pricing methodology. This approach is based on sequential clearing of Energy Market (EM) and Reserve Market (RM) with the objective of procurement cost minimization. The optimization problem is formulated and solved using Optimal Power Flow (OPF) technique which considers all transmission constraints and power flow limits. In this model, the energy is procured first in EM followed by OR in RM. The procurement of both energy and OR using sequential approach has been demonstrated by considering modified IEEE 5-unit test system. Keywords: Electric power deregulation, auction design, operating reserve, sequential dispatch, energy market, reserve market Cite this Article Anuj Banshwar, Yog Raj Sood, Rajnish Shrivastava, A Disaggregated Optimization Approach for Competitive Procurement of Energy and Operating Reserve. Journal of Power Electronics and Power Systems. 2016; 6(3): 33–41p.
Wireless Annunciator Window for Substation Application with GSM Facility
The work aim is to understand and design of wireless communication between annunciator window and circuit breaker, relay, transformers etc., are located in switchyard for Power Substation. The wireless communication methods are more reliable, convenient and economical, faster as compared to the actual wire communication system. In our project we used a GSM system for sending wireless signal to the Annunciator window. GSM system supports to transfer the information over a long distance without use of electrical conductor or wire. It provides more flexibility and continues to play a significant role in the modernization. Using this GSM technology we get correct information on our mobile phone also. This helps when operator is long away from substation so he/she can provide control action from this place to the helper one. Keywords: Wireless, GSM, Annuncitor window, Substation, Switchyard
Performance Evaluation of Active Power Filter for Aircraft System
Sinusoidal current control approach for extracting reference currents for shunt lively energy filters were modified using genetic algorithm and its performances had been compared. The acute evaluation of comparison of the repayment functionality based on THD and speedwell be finished, and pointers may be given for the selection of method for use. The simulated effects the usage of MATLAB version are shown, and they will undoubtedly prove the significance of the proposed manipulate technique of plane shunt APF. Keywords: Aircraft electrical system, shunt active filter (APF), sinusoidal current control strategy, GA, THD Cite this Article Saifullah Khalid. Performance Evaluation of Active Power Filter for Aircraft System. Journal of Power Electronics & Power Systems. 2017; 7(1): 1–8p.
Harmonic Compensation in Grid Interconnected DG Units by Closed Loop Control
This paper deals with improvement of power quality problem namely harmonic problem using distributed generation as their source of electricity. The harmonics occur in such a system because of the nature of loads connected. There are many power quality problems. out of which harmonics normally caused by non-linear loads like variable frequency drives, fluorescent lightning, office computers etc. have adverse effects on the power quality. Also, harmonic detection and prediction is of utmost importance because it can cause electrical noise, sensitive equipment malfunctioning, tripping of circuit breakers etc. Reduction of harmonics is considered very important for the proper functioning of the customer equipments. There may be many harmonic mitigation techniques including active and passive methods, and choosing the best method out of it may be a challenging task. Proposed method is for single phase inverter for DG systems that requires power quality features like harmonic and its compensation for grid connected operation. Here simulation results in DG and grid connected mode is shown. An active harmonic compensation technique by using current controlled technique has been discussed in this paper, which is basically a closed loop control technique which will eliminate the DG current tracking errors. The effectiveness of the harmonic compensation scheme developed has been verified by the simulation and hardware developed for 1-phase system. The harmonics caused by the non linear loads has been compensated by using closed loop control, in which the harmonic current frequency variation is taken as closed loop or given as a feedback to the microcontroller, which in turns gives the pulses to the driver circuit and the driver circuit gives the switching pulses to the gate of the mosfets, which is known as PWM technique and this is how harmonics are eliminated in the system. The simulation has been carried out in Matlab 2013. The simulation deals with the PQ theory based PI controller which minimizes the harmonics generated by non-linear loads. The simulation and hardware results obtained validate this technique. Keywords: Distributed generation, harmonics, MATLAB/simulink Cite this Article Asha Gaikwad, Prachi Jeevane. Harmonic Compensation in Grid Interconnected DG Units by Closed Loop Control. Journal of Power Electronics and Power Systems. 2017; 7(1): 9–17p.
Circuit Topologies, Operation, Control Schemes and Modulation Techniques of Modular Multilevel Inverter
The Modular Multilevel Converter (MMC) is one of the developing topology. MMC has several attractive features such as a modular structure, transformer-less operation, easily scalable in terms of voltage and current, low expense for redundancy and fault tolerant operation and excellent output waveforms quality. Due to these attractive features industry and researcher increased the interest in this converter. This interest results in the development of new power topologies, modulation strategies and control schemes. The main control objective of MMCs is to control capacitor voltages of each sub module (SM) and arm currents at its terminals. Depending on the application, it could be required to control the DC and AC voltages or currents. The MMC has no of cell in each arm, this cell has different power topologies. This paper focus on comparison of different control techniques to achieve different control objectives, like control of external voltage and current, control of average capacitor voltages, control of arm circulating current etc. Selection of the modulation techniques is also one of the research area to enhance the performance of the MMC. This paper highlights some convectional and advance pulse width modulation techniques. Various pulse width modulation (PWM) techniques based on using a single reference waveform that have been developed for MMC include: Phase Disposition(PD), Phase opposite Disposition (POD), Alternate Phase opposite Disposition (APOD), Phase Shifted carrier (PSC) and Carrier Rotation PWM scheme. Keywords: Capacitor voltage balancing, circulating current control, modular multilevel converter, modulation techniques, switching frequency Cite this Article Kaumil B. Shah, Hina Chandwani. Circuit Topologies, Operation, Control Schemes and Modulation Techniques of Modular Multilevel Inverter. Journal of Power Electronics and Power Systems. 2017; 7(1): 28–40p.
Design and Simulation of Fuzzy Logic Based Speed Control of Electrical Vehicle with Induction Motor Taking Core Loss and Stray Load Losses into Account
In modern technology electrical differentials to design Electrical Vehicle are getting popular for its simplicity, faster response, accurate control capability and other facility. The controller design for the distinctive motors is a captivating and challenging work to acquire sought execution appropriately. For this different kind of controller is used to get accurate results. For Induction Motor it is very important to control the speed and torque to get smooth control application. Field Oriented Control aids the factor and empowers independent control of speed and torque by building up an autonomous relationship is created due to consideration of core loss and stray load losses while modeling Induction Motor which is neglected at most of the works. In this paper, with a better modeled IM Fuzzy Logic controller is accompanied to give it more accuracy and simplicity. The performances of the designed controller is accessed using MATLAB/Simulink where all the simulation results shows enough confirmation that smooth, exact and vigorous performance is achievable with the proposed controller.
Design and Development of Power Saving Generation using Conveyor Belt
This paper represents the “power saving and generation using conveyor belt”. As electricity prices continue to rise the increasing need of energy management; requires better understanding of models for energy-consuming applications, such as conveyor belts. Our team chooses to research the flexibility in power saving and generation using conveyor belt with different type of applications. Conveyor belts are used in wide range of industries, including power generation, mining and mineral processing. This model consists of LDR, rpm sensor, and rpm control circuit which controls the speed of the motor driving the conveyor. The object sensors which detect the objects send signal to the motor driving circuit to on/off the motor. It provides many advantages over conventional relay type of control, including increased reliability, more flexibility, lower cost, communication capability and faster response time. This paper is based on systematic conveyor controller to control the speed of conveyor belt. That’s why power saving and generation is possible. Keywords: LDR, Geared DC motor, sensors, power saving, conveyor belt Cite this Article: Akshay Mohale, Aabasaheb Kurund, Nikhil Jadhav et al. Design and Development of Power Saving Generation using Conveyor Belt. Journal of Power Engineering & Power Systems. 2017; 7(1): 18–21p.
Review: Distribution Generation and Islanding
The demand for distributed generation (DG) has increased in recent years and many countries across the world are adopting it due to various factors such as improvements in technologies including renewable energy sources and the efficiency it provides. However, islanding detection is of prime importance as it can be hazardous to the maintenance workers. The increasing use of distributed generation causes more number of parameters to be controlled for the proper functioning of the utility. Formation of islands is a problem in such type of generation. This paper gives a review on a brief introduction on islanding, its types, reasons for formation of islands, challenges and the recent techniques available for islanding detection with its comparison so as to avoid complete grid failure. Keywords: Distributed generation, nondetection zones, islanding, islanding detection, point of common coupling Cite this Article Asha Gaikwad, Prachi Jeevane. Review: Distribution Generation and Islanding. Journal of Power Electronics and Power Sytems. 2016; 6(2): 45–54p.
Improvement in Distribution System Performance by D-STATCOM
Increasing use of power electronics devices in modern power system has many power quality problems arise in distribution system like voltage sag, voltage swell, harmonics, flickering, etc. This problem largely affects the performance of distribution system. Distribution static synchronous compensator (D-STATCOM) is a device which is used for the solution of power quality problems. In this paper, voltage sag and voltage swell were generated and mitigation of the same is achieved using D-STATCOM at point of common coupling (PCC). There is 415 V distribution test system taken for the study. Simulation is carried out and results are analyzed using MATLAB Simulink software. Keywords: D-STATCOM, voltage sag, voltage swell, distribution static compensator, distribution system performance, power quality problem Cite this Article Solanki Lalkrushna L, Patel RR, Chintan Patel. Improvement in Distribution System Performance by D-STATCOM. Journal of Power Electronics and Power Systems. 2016; 6(2): 25–33p.
Mitigation of Magnetizing Inrush Current for Unloaded Three Phase Electrically Coupled Power Transformers involving Remanence Effect using Distributed Asymmetrical Winding Configuration
This paper demonstrates a novel approach to mitigate the magnetizing inrush current of a coupled unloaded transformer to a considerable extent having had the residual magnetism present in its core with the aid of a modern distributed asymmetrical winding configuration alike from the conventional methods. The proposed method has been analyzed on Power transformer with different configuration of winding, core design arrangement while feeding from the mains to star and delta side of transformer individually. The instant of plugging with circuit breakers affecting the performance characteristics of transformer has also been elaborated. The proposed method is verified by the simulation in PSCAD environment on a practical transformer of 30 MVA, 27/ 132 kV, three units of single phase transformer connected in star and delta configuration. The simulated results show a good agreement in mitigation of magnetizing inrush current to small percentage of rated full load current. So, the above said method can be applied in practical field as the magnitudes of magnetizing inrush currents can be estimated before manufacturing of transformer. Keywords: Distributed winding, magnetizing inrush current, inrush analogous inductance, air core reactance Cite this Article Haresh S. Nankani, Hina Chandwani, Urmil Parikh. Mitigation of Magnetizing Inrush Current for Unloaded Three Phase Electrically Coupled Power Transformers involving Remanence Effect using Distributed Asymmetrical Winding Configuration. Journal of Power Electronics and Power Systems. 2016; 6(2): 89–99p.
Optimal Capacity of Pump Storage System for Standalone Green Microgrid Interconnection with Main Grid in Deregulated Power Sector
The energy crisis requires more generation capability, and is more importance to the storage technologies. To overcome this shortage of energy, pump storage system is used in the power system with great storing capacity up to this time. The isolated or regional grid in remote areas probably depends on renewable power sources such as wind; solar, geothermal, tidal, etc. with its availability is the main power resources. It is quite necessary for improving the operation, stability and economical efficiency of the microgrid grid. Therefore, a certain capacity of pump storage system is required to conduct these operations. In this paper, two case studieshave been presented for an isolated microgrid with interconnected to maingrid. Firstly, without storage and secondly with pump storage system. On the basis of these case studies, the optimal capacity of the pump storage system has been determined. The proposed work has been validated by considered 3-microgrid system interconnection with main grid. A new technique like energy storage system is used for a simple, economic, and feasibility evaluation of energy storage facilities in pump storage system. The energy is stored in the form of water potential through pumping using renewable energy sources. The results demonstrated that the optimal capacity of pump storage plant has been determined by calculated surplus power and loss of load in the pump storage system. . Keywords: Green energy, concept of microgrid, layout of standalone renewable energy systems, model and mathematical formulation pumped storage system Cite this Article Digambar Singh, Jasmine Kaur Saini, Yog Raj Sood. Optimal Capacity of Pump Storage System for Standalone Green Microgrid Interconnection with Main Grid in Deregulated Power Sector. Journal of Power Electronics and Power Systems. 2016; 6(2): 100–114p.
Optimal Placement and Location of Phasor Measurement Unit Considering Bus Voltage Using Genetic Algorithm
This paper presents a procedure by which new PMU locations can be symmetrically determined in order to render an observable system. Monitoring and supervision of power systems are provided by the control centre, whose role is the design, coordination and network management. In this paper, an attempt has been made to control technique based on the implantation of measurement units at the network buses. A proposed methodology makes the system completely observable and calculates the optimal number of PMUs. In addition, the two different procedures have been applied to solve the PMU placement problem. One is an integer based programming (IP) method and the other one is a Genetic Algorithm (GA). A comparative study has been done by implementing both the methods to find the optimal number of PMUs. Once an optimal number of PMUs have been available, a load flow has been performed to know the bus voltage magnitude, if the bus voltage magnitude is within safe limit then the corresponding PMU will be operate otherwise not. The proposed methodology has been successfully implemented on three IEEE test systems. Keywords: PMU, optimal placement, genetic algorithm, bit integer programming, newton raphson Cite this Article Sandeep Bhongade, Lokesh Verma. Optimal Placement and Location of Phasor Measurement Unit Considering Bus Voltage Using Genetic Algorithm. Journal of Power Electronics and Power Systems. 2016; 6(2): 74–84p.
Area Load Frequency Control (ALFC) using Different Conventional Algorithms
In practical system, frequency is always changing because of changing load. So, load frequency control (LFC) is necessary to maintain the frequency at an optimum level. So, in the general system, integral (I), proportional integral (PI) and proportional integral derivative (PID) controller is used for compensation of frequency. In this paper simulation for load frequency control (LFC) is done on two area thermal systems and also different conventional PID tuning methods for minimization of error have been shown. Keywords: ALFC, two area thermal system, LQR, PID controller Cite this Article Garvil Vadher, Sumit Rathor. Area Load Frequency Control (ALFC) Using Different Conventional Algorithms. Journal of Power Electronics and Power Systems. 2016; 6(2): 1–7p.