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Simulation Research of Transient Over-voltage on High-voltage Shunt Capacitor Banks
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作者 HU Quan-wei ZHOU Xing-xing +3 位作者 SI Wen-rong ZHANG Yang LI Jun-hao LI Yan-ming 《高压电器》 CAS CSCD 北大核心 2011年第9期37-43,共7页
With the development of power systems,a large number of shunt capacitors are used to improve power quality in the distribution network.The shunt capacitor banks are operated much frequently,as a result,the capacitor b... With the development of power systems,a large number of shunt capacitors are used to improve power quality in the distribution network.The shunt capacitor banks are operated much frequently,as a result,the capacitor banks will bear large numbers of over-voltage inevitably.If the over-voltage exceeds certain amplitude,the capacitor will be damaged.This paper aims at the capacitor banks in the 35 kV side of Shanghai Xu-xing 500 kV substation,and applies ATP-EMTP to simulate the over-voltages generated by operating the switches under different angles of the source.Finally,according to the results of simulation and theoretical analysis,a best choice(i.e.angles of the source) to switch on capacitor banks is proposed.In this case the over-voltage on the capacitor will be limited to lowest. 展开更多
关键词 capacitor banks operating over-voltage EMTP SIMULATION
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Effect of Switching Devices on Power Quality and Transient Voltage Suppression Using Capacitor Bank Model
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作者 Isaac Kofi Mensah Prah Joseph Cudjoe Attachie 《Journal of Power and Energy Engineering》 2022年第5期77-89,共13页
The main purpose of the electrical power system is to transport and distribute energy generated by the central power plants in a safe and reliable manner to the customer premises. Most of the electrical equipment is e... The main purpose of the electrical power system is to transport and distribute energy generated by the central power plants in a safe and reliable manner to the customer premises. Most of the electrical equipment is exposed within the open which suggests they can be vulnerable to lightning strikes, road dwindling, windstorms, and a few engineering activities with the potential of causing different degrees of damage to the electrical equipment. One of the ways to guard the equipment is to deploy switching devices. However, the operations of most of these switching devices produce oscillatory transient in the electrical transmission and distribution systems which result in voltage, current, and frequency fluctuations in the load. This paper investigates the effect of switching devices on power quality and proposes a positive sequence voltage power transient suppression technique that can spontaneously improve the distorted voltage at the instant of capacitor switching using the capacitor line model as a case study. MATLAB/Simulink software was utilized for the analysis on an electrical network model with bus voltages of 69 kV/12.47 kV and 480 V. The results showed that, during switching operations, the positive sequence voltage power detector block produces ripple-free accurate results. 展开更多
关键词 Capacitor banks Inrush Current Laplace Transform Power Quality Posi-tive Sequence SWITCHING Transient Voltage
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Optimum Simultaneous Allocation of Renewable Energy DG and Capacitor Banks in Radial Distribution Network
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作者 Sivasangari Rajeswaran Kamaraj Nagappan 《Circuits and Systems》 2016年第11期3556-3564,共10页
Nowadays the optimal allocation of distributed generation (DG) in the distribution network becomes the popular research area in restructuring of power system. The capacitor banks introduced in the distribution network... Nowadays the optimal allocation of distributed generation (DG) in the distribution network becomes the popular research area in restructuring of power system. The capacitor banks introduced in the distribution networks for reactive power compensation also have the capacity to minimize the real and reactive power losses occurred in the system. Hence, this research integrates the allocation of renewable energy DG and capacitor banks in the radial distribution network to minimize the real power loss occurred in the system. A two-stage methodology is used for simultaneous allocation of renewable DG and capacitor banks. The optimum location of renewable energy DG and capacitor banks is determined using the distributed generation sitting index (DGSI) ranking method and the optimum sizing of DG and capacitor banks is found out for simultaneous placement using weight improved particle swarm optimization algorithm (WIPSO) and self adaptive differential evolution algorithm (SADE). This two-stage methodology reduces the burden of SADE and WIPSO algorithm, by using the DGSI index in determining the optimal location. Hence the computational time gets reduced which makes them suitable for online applications. By using the above methodology, a comprehensive performance analysis is done on IEEE 33 bus and 69 bus RDNs and the results are discussed in detail. 展开更多
关键词 Distributed Generation Capacitor banks Real Power Loss Radial Distribution Network Distributed Generation Sitting Index WIPSO SADE
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Design of Capacitor Bank in Parallel to Photovoltaic Power Plant
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作者 A. Kalyuzhny B. Reshef +3 位作者 G.Yehuda G.David P. Koulbekov T. Day 《Journal of Energy and Power Engineering》 2014年第5期939-947,共9页
The purpose of the paper is to develop a solution for application of PV (photovoltaic) generators in MV (medium voltage) distribution system without unacceptable voltage changes due to drops of PV power output. Th... The purpose of the paper is to develop a solution for application of PV (photovoltaic) generators in MV (medium voltage) distribution system without unacceptable voltage changes due to drops of PV power output. The proposed solution includes operation of PV with predetermined leading power factor and addition of a capacitor bank in parallel to PV plant in order to compensate the reactive power absorbed by the PV inverters. The analytical expression of required power factor angle is derived. Adding a capacitor bank in parallel to PV power plant may pose a problem because of space limitations. The dimensions and cost of small MV capacitor banks depend significantly on the capacitor bank protection against internal faults. Application of the developed negative-sequence current difference method for the unbalance protection of the capacitor banks enables to achieve a compact and cost-reduced design of the banks connected in parallel to PV power plants. A real-world example of operation of the PV plant in parallel to the capacitor bank with the novel protection scheme is described. 展开更多
关键词 Photovoltaic power plant power quality capacitor bank unbalance protection.
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A wideband low-phase-noise LC VCO for DRM/DAB frequency synthesizer
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作者 雷雪梅 王志功 王科平 《Journal of Southeast University(English Edition)》 EI CAS 2010年第4期528-531,共4页
The wideband CMOS voltage-controlled oscillator(VCO)with low phase noise and low power consumption is presented for a DRM/DAB(digital radio mondiale and digital audio broadcasting)frequency synthesizer.In order to... The wideband CMOS voltage-controlled oscillator(VCO)with low phase noise and low power consumption is presented for a DRM/DAB(digital radio mondiale and digital audio broadcasting)frequency synthesizer.In order to obtain a wide band and a large tuning range,a parallel switched capacitor bank is added in the LC tank.The proposed VCO is implemented in SMIC 0.18-μm RF CMOS technology and the chip area is 750 μm×560 μm,including the test buffer circuit and the pads.Measured results show that the tuning range is 44.6%;i.e.,the frequency turning range is from 2.27 to 3.57 GHz.The measured phase noise is-122.22 dBc/Hz at a 1 MHz offset from the carrier.The maximum power consumption of the core part is 6.16 mW at a 1.8 V power supply. 展开更多
关键词 CMOS voltage-controlled oscillator switched capacitor bank MOS varactors WIDEBAND low phase noise DRM/DAB frequency synthesizer
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Power loss reduction of distribution systems using BFO based optimal reconfiguration along with DG and shunt capacitor placement simultaneously in fuzzy framework 被引量:1
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作者 M.Mohammadi A.Mohammadi Rozbahani S.Bahmanyar 《Journal of Central South University》 SCIE EI CAS CSCD 2017年第1期90-103,共14页
In distribution systems,network reconfiguration and capacitor placement are commonly used to diminish power losses and keep voltage profiles within acceptable limits.Moreover,the problem of DG allocation and sizing is... In distribution systems,network reconfiguration and capacitor placement are commonly used to diminish power losses and keep voltage profiles within acceptable limits.Moreover,the problem of DG allocation and sizing is great important.In this work,a combination of a fuzzy multi-objective approach and bacterial foraging optimization(BFO) as a meta-heuristic algorithm is used to solve the simultaneous reconfiguration and optimal sizing of DGs and shunt capacitors in a distribution system.Each objective is transferred into fuzzy domain using its membership function.Then,the overall fuzzy satisfaction function is formed and considered a fitness function inasmuch as the value of this function has to be maximized to gain the optimal solution.The numerical results show that the presented algorithm improves the performance much more than other meta-heuristic algorithms.Simulation results found that simultaneous reconfiguration with DG and shunt capacitors allocation(case 5) has 77.41%,42.15%,and 56.14%improvements in power loss reduction,load balancing,and voltage profile indices,respectively in 33-bus test system.This result found 87.27%,35.82%,and 54.34%improvements of mentioned indices respectively for 69-bus system. 展开更多
关键词 network reconfiguration distributed generation (DG) capacitor banks fuzzy framework bacterial foragingoptimization
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Particle swarm optimization algorithm for simultaneous optimal placement and sizing of shunt active power conditioner(APC)and shunt capacitor in harmonic distorted distribution system
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作者 Mohammadi Mohammad 《Journal of Central South University》 SCIE EI CAS CSCD 2017年第9期2035-2048,共14页
Due to development of distribution systems and increase in electricity demand,the use of capacitor banks increases.From the other point of view,nonlinear loads generate and inject considerable harmonic currents into p... Due to development of distribution systems and increase in electricity demand,the use of capacitor banks increases.From the other point of view,nonlinear loads generate and inject considerable harmonic currents into power system.Under this condition if capacitor banks are not properly selected and placed in the power system,they could amplify and propagate these harmonics and deteriorate power quality to unacceptable levels.With attention of disadvantages of passive filters,such as occurring resonance,nowadays the usage of this type of harmonic compensator is restricted.On the other side,one of parallel multi-function compensating devices which are recently used in distribution system to mitigate voltage sag and harmonic distortion,performs power factor correction,and improves the overall power quality as active power conditioner(APC).Therefore,the utilization of APC in harmonic distorted system can affect and change the optimal location and size of shunt capacitor bank under harmonic distortion condition.This paper presents an optimization algorithm for improvement of power quality using simultaneous optimal placement and sizing of APC and shunt capacitor banks in radial distribution networks in the presence of voltage and current harmonics.The algorithm is based on particle swarm optimization(PSO).The objective function includes the cost of power losses,energy losses and those of the capacitor banks and APCs. 展开更多
关键词 shunt capacitor banks active power conditioner multi-objective function particle swarm optimization (PSO) harmonic distorted distribution system
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Microcontroller Control of Reactive Power Compensation for Growing Industrial Loads
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作者 Edwin N. Mbinkar Derek Ajesam Asoh Sulayman Kujabi 《Energy and Power Engineering》 CAS 2022年第9期460-476,共17页
Many industrial installations in developing countries start-up as small factories, without regard for the need of compensation of reactive power, leading to significant financial losses in the long term. By improving ... Many industrial installations in developing countries start-up as small factories, without regard for the need of compensation of reactive power, leading to significant financial losses in the long term. By improving the power factor, the customer can reduce its power demand and potentially increase efficiency of their equipment. A PIC microcontroller is used to switch capacitor banks to compensate for the reactive power. In order to determine the size of the capacitor bank needed, the microcontroller calculates the phase difference between the voltage and the current. The results obtained based on the lagging power factor for three test loads show an improvement in the power factor from 0.52 to 0.96 under different test load conditions. 展开更多
关键词 Power Factor Compensation Capacitor bank PIC Microcontroller Reactive Power
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Transitional Recovery Voltages at Capacitive Currents Switching-off by Vacuum and SF6 Circuit-Breakers
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作者 Tahir M. Lazimov Samir V. Imanov Esam A. Saafan 《Journal of Energy and Power Engineering》 2012年第5期777-783,共7页
Results of calculation the recovery voltages conditioned by capacitive currents switching-off by high voltage vacuum and auto-compression (SF6) circuit-breakers are presented in the article. The purpose of research ... Results of calculation the recovery voltages conditioned by capacitive currents switching-off by high voltage vacuum and auto-compression (SF6) circuit-breakers are presented in the article. The purpose of research was evaluating the maximum values of recovery voltages and also studying the dependence of recovery voltages on some influencing factors, especially on type of circuit-breaker presented in numerical models with its dielectric strength restoration law, chopping current and operation time. The research was carried out with using computer simulation. 展开更多
关键词 Recovery voltages capacitive currents switching overvoltages capacitor banks dielectric strength restoration law.
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Power Quality Improvement of Distribution Network Using BESS and Capacitor Bank 被引量:3
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作者 F.R.Islam A.Lallu +2 位作者 K.A.Mamun K.Prakash N.K.Roy 《Journal of Modern Power Systems and Clean Energy》 SCIE EI CSCD 2021年第3期625-632,共8页
The power demand around the world is increasing rapidly.The aging distribution network architectures are used by the existing utility companies to deliver power to the consumers,which significantly affects the reliabi... The power demand around the world is increasing rapidly.The aging distribution network architectures are used by the existing utility companies to deliver power to the consumers,which significantly affects the reliability,stability and quality of the delivered power.Different techniques such as compensation devices have been used by power system engineers and researchers to maintain the quality of power transmitted to end users.In this paper,wattage and volt-amp reactive(VAR)planning scheme has been proposed by using the combination of battery energy storage systems(BESS)and compensators to deal with the vulnerability of networks to voltage drop and system inefficiency.The cost-effective combination of BESS and shunt capacitor bank will then be analyzed to indicate the benefit of the proposed scheme. 展开更多
关键词 Battery energy storage system(BESS) shunt capacitor bank reliability stability quality volt-amp reactive(VAR)planning distribution network
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