共查询到20条相似文献,搜索用时 15 毫秒
1.
Keiji Wada Hideaki Fujita Hirofumi Akagi Noboru Shibamaru 《Electrical Engineering in Japan》2000,133(2):1-10
This paper is focused on a voltage‐detection‐based shunt active filter for installation on a power distribution system. A main objective of the active filter is to achieve damping of harmonic propagation coming from series/parallel resonance between capacitors for power factor correction and line inductors in the distribution system. The active filter installed at the end terminal of a distribution feeder is controlled in such a way as to present infinite impedance to the external circuit for the fundamental frequency, and to exhibit low resistance for harmonic frequencies. As a result, the active filter acts as a damping resistor for the harmonic propagation, like a 50‐Ω terminator installed at the end of a signal transmission line. It is verified by experiment that the active filter intended for harmonic termination has the capability of harmonic damping throughout the distribution feeder. © 2000 Scripta Technica, Electr Eng Jpn, 133(2): 1–10, 2000 相似文献
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Pichai Jintakosonwit Hirofumi Akagi Hideaki Fujita Satoshi Ogasawara 《Electrical Engineering in Japan》2003,142(4):56-65
This paper discusses automatic gain adjustment in a fully‐digital‐controlled shunt active filter intended for installation on power distribution systems. This is the first step in cooperative control of multiple shunt active filters based on voltage detection for harmonic damping throughout power distribution systems. In general, an optimal control gain is equal to the characteristic impedance of a distribution line. However, it is difficult to know the circuit parameters of a real distribution line, which depend strongly on feeder connections, shunt capacitors, and loads. Therefore, the main purpose of the gain adjustment is to help the active filter to damp out harmonic propagation without considering the circuit parameters. Moreover, the gain adjustment can reduce the compensating current and losses in the active filter. The active filter having the function of automatic gain adjustment is experimentally compared to that with a constant gain. Experiment results verify the effectiveness of the active filter having the function of automatic gain adjustment. © 2003 Wiley Periodicals, Inc. Electr Eng Jpn, 142(4): 56–65, 2003; Published online in Wiley InterScience ( www.interscience.wiley.com ). DOI 10.1002/eej.10094 相似文献
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根据串联型有源电力滤波器的工作原理,基于瞬时无功功率理论,提出了一种谐波电压的瞬时检测方法。该方法具有快速、准确的特点,实验结果证明了所提出方法的正确性和可靠性,为有效抑制谐波提供了可靠的保证。 相似文献
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并联有源滤波器(shunt active power filter, SAPF)在主动配电网系统中应用日益广泛,提升SAPF的补偿性能成为众多学者关注和研究的热点。对直流侧电压精准稳定控制是保证SAPF补偿性能的关键。采用传统PI控制系统在非线性负载突变和电压跳变时无法对直流侧电压进行快速稳定控制,为改善直流侧电压的控制性能,提出电压外环滑模变结构PI复合控制器。仿真与实验结果表明:滑模PI复合控制器提高了直流电压控制的稳态精度和响应速度,降低了直流电压波动对SAPF补偿性能的影响。 相似文献
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配电系统的最新趋势表明,非线性负载的使用将在未来呈现上升的趋势,因此研究了并联型有源滤波器,用来消除谐波,从而提升电能质量。使用一种无谐波检测方法,从而使补偿精度不再受负载电流检测精度的影响,输出电流波形的控制使用一种优化的准比例谐振控制器完成。在并联型有源滤波器主电路系统结构的基础上,提出了一种电压电流双闭环及电流比例负反馈的准比例谐振优化控制方案。最后,通过MATLAB/Simulink对所提优化控制方案进行仿真,所提出优化控制的可行性通过仿真实验得到充分验证。 相似文献
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为解决并联型有源电力滤波器三相电流之间和有功无功电流之间的强耦合问题,以达到改善负载补偿效果的目的,总结了近年来相关学者对有源电力滤波器解耦控制的研究工作。首先,分析了并联有源电力滤波器的结构和特点。然后,从搭建模型的不同类型出发,对比分析了三相三线制、三相四线制及混合型并联有源电力滤波器的结构特点和控制方法,研究了近年来有源电力滤波器各种解耦控制方法的研究进展及相互的联系。最后,结合近年来新兴的控制方法,对有源电力滤波器解耦控制的研究做了展望。 相似文献
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基于瞬时无功理论的并联型有源滤波器恒功率控制 总被引:1,自引:0,他引:1
根据瞬时功率理论,研究了并联型有源滤波器的工作机制,通过实现逆变器有功功率和无功功率的解耦,提出了并联型有源滤波器恒功率控制策略。该控制策略通过分离出待补偿的功率分量,然后计算出其与逆变器实际功率的误差,根据误差生成逆变器参考电压,采用空间矢量调制算法对功率进出补偿,实现系统的恒功率控制。该策略可以有效抑制系统交流侧谐波电流,补偿无功功率,稳定输出的有功功率,改善系统稳态性能。最后,通过Maflab/Simulink对该控制策略进行仿真验证,结果证明了该策略的正确性和有效性。 相似文献
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在研究了PI控制方法控制方法的基础上,提出了对有源电力滤波器直流侧电压实现模糊递推PI控制的方法,设计了模糊控制规则,详细介绍了模糊递推PI控制方法的控制原理,并且针对PI控制方法和模糊递推PI控制方法采用Matlab/Simunlink仿真软件对直流侧电压进行仿真分析。仿真结果表明,模糊递推PI控制方法在系统稳定以及负载突变时比PI控制方法能够更加有效地消除稳态误差,使有源电力滤波器直流侧电压实现精确跟踪,从而提高滤波器的滤波效果。 相似文献
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电力有源滤波器是抑制谐波的有效手段,补偿分量的准确检测直接决定了它的补偿效果。提出了改进的三相电压畸变且不对称情况下的基波正序有功电流分量的检测方式,通过dq变换分别测出电压和电流基波正序分量的有效值和相位,求出准确的电流基波正序有功分量,从而得到需要补偿的电流分量。电压和电流基波正序分量的检测同步进行,减少了低通滤波器的延时,仿真结果说明了改进方式的有效性和正确性。 相似文献
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基于DFT的瞬时谐波检测方法 总被引:11,自引:7,他引:11
提出了一种用离散傅里叶变换DFT(Discrete Fourier Transform)实现特殊滤波器的瞬时谐波电流的检测方法。该滤波器在基频处的值无衰减,相位无延时,能将2次以上的谐波全部滤掉。根据滤波器冲激响应的特点得到了滤波算法的递推关系,大大地节约了计算量。基于此滤波器设计的数字谐波检测方法可用于任何一种电力系统的谐波补偿装置中,理论推导和仿真实验表明,该数字谐波检测系统既保留了数字滤波器的准确性,又克服了长期以来数字滤波器跟随性差的问题,算法易于实现,具有较高的实用价值。 相似文献
13.
Shoji Kawasaki Kazuki Shimoda Motohiro Tanaka Hisao Taoka Junya Matsuki Yasuhiro Hayashi 《Electrical Engineering in Japan》2013,182(3):19-29
The amount of distributed generation (DG) such as photovoltaic systems and wind power generator systems installed in distribution systems has been increasing because of reduction of the effects on the environment. However, harmonic problems in the distribution system are a concern in the context of increased connection of DGs through inverters and the spread of power electronics equipment. This paper proposes a method for the restraint of voltage total harmonic distortion (THD) in a whole distribution network by active filter (AF) operation of multiple power conditioner systems (PCSs). It also proposes a method for determination of the optimal gain of AF operation so as to minimize the maximum value of voltage THD in the distribution network by real‐time feedback control with measured data from information technology (IT) switches. In order to verify the validity of the proposed method, numerical calculations are carried out using an analytical model of a distribution network of interconnected DGs with PCSs. © 2012 Wiley Periodicals, Inc. Electr Eng Jpn, 182(3): 19–29, 2013; Published online in Wiley Online Library ( wileyonlinelibrary.com ). DOI 10.1002/eej.22354 相似文献
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分析了电力电网的谐波源、谐波特性和谐波产生的危害,并通过在某大型化工公司低压配电系统中的实际应用案例,研究了电压型有源电力滤波器投入前后的数据等情况,说明了有源电力滤波器的谐波治理技术是改善抑制电网污染、提高电能质量、保证电气设备安全运行的有效手段之一。 相似文献
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并联型有源电力滤波器的仿真研究 总被引:4,自引:0,他引:4
并联型有源电力滤波器可较好地补偿电流源产生的谐波,利用MATLAB中的电力系统仿真工具箱对其进行建模与仿真.仿真试验结果表明,它能很好地补偿非线性负载产生的谐波. 相似文献
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并联有源滤波器的最优电压滞环电流控制 总被引:10,自引:4,他引:10
简要介绍了并联有源滤波器的原理其普通滞环电流控制的特点,针对普通滞环电流控制方法的不足,提出并详细分析了一种最优电压滞环电流控制新方法,该方法的显著特点是通过识别参考电压矢量知电流误差矢量的区域控制滤波器的输出,避免了复杂计算和逆变器不必要的开关,并且快速,准确,从而改善了有源滤波器的性能。 相似文献
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随着越来越多的非线形电力负荷投入使用,使城市电网中的谐波分量猛增.为降低谐波对电力系统的危害,更有效地抑制揩波,提出与传统的电力有源滤波器不同的新型设计思路,并设计实现了小功率单相新型谐波抑制装置,取得比较好的谐波抑制效果,体现了该装置功能多、性能好、克服了常规LC无源滤波器不足等特点. 相似文献
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根据瞬时无功功率理论基础,基于传统的ip-iq算法在谐波检测中其动态响应及精度上的不足,对其低通滤波器(LPF)进行改进,增加了平均值滤波算法。理论分析及Matlab仿真实验表明,改进后的谐波检测方法具有较快的动态响应与良好的检测精度,具有较高的应用与研究价值。 相似文献
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This paper proposes a series active filter for mitigation of the third‐harmonic voltage in a three‐phase four‐wire power distribution system in a building. The active filter which consists of a single‐phase inverter can suppress the harmonic voltage of the system. The active filter is characterized by acting not only as a capacitor but also as a resistor for the third‐harmonic components. A Hilbert transformer is applied to the controller of the active filter in order to realize accurate third‐harmonic detection on a single‐phase active filter. Measurement results of harmonic distortion of source voltage in a building is also shown in this paper. It is clarified in a simulation and experiment that the active filter can suppress the third‐harmonic voltage without increasing neutral conductor current. © 2004 Wiley Periodicals, Inc. Electr Eng Jpn, 150(1): 62–70, 2005; Published online in Wiley InterScience ( www.interscience.wiley.com ). DOI 10.1002/eej.10379 相似文献