改进的自适应遗传算法在配电网谐波抑制中的应用

以配电网中无源和有源滤波器的总费用最小为目标函数,以谐波电压和滤波器的安全运行为约束条件,将改进的自适应遗传算法应用于配电网谐波抑制工作,对无源和有源滤波器的安装节点和参数进行统一优化配置。给出了一个18节点的典型配电系统运算结果,说明了整个算法的有效性。     

改进的自适应遗传算法在配电网谐波抑制中的应用

以配电网中无源和有源滤波器的总费用最小为目标函数,以谐波电压和滤波器的安全运行为约束条件,将改进的自适应遗传算法应用于配电网谐波抑制工作,对无源和有源滤波器的安装节点和参数进行统一优化配置.给出了一个18节点的典型配电系统运算结果,说明了整个算法的有效性.     

等效无限长有源电力滤波器在环形配电网中的应用

随着高科技园区等用户对供电可靠性要求的提高,环形配电网成为一种发展趋势。与射线型配电网相似,由功率因数校正电容和系统自身电感导致的谐波谐振现象,使得环形配电网中的谐波污染问题成为人们关注的焦点之一。该文针对环形配电网中谐波谐振现象,基于将环形配电网等效为射线型配电网的基本思想,提出一种在环形配电网中点安装等效无限长有源电力滤波器(infinite active power filter,I-APF)的谐波抑制方案。相比于在环形配电网中点安装阻性有源电力滤波器(resistive active power filter,R-APF)的传统方案,该方案不仅能够获得更好的谐波抑制效果;同时,该方案对于安装位置的改变、电容的改变和非线性负载的改变,均具有更好的适应性和谐波抑制效果。仿真分析和实验结果均验证了该方案的正确性和有效性。     

等效无限长有源电力滤波器在环形配电网中的应用EI北大核心CSCD

随着高科技园区等用户对供电可靠性要求的提高,环形配电网成为一种发展趋势。与射线型配电网相似,由功率因数校正电容和系统自身电感导致的谐波谐振现象,使得环形配电网中的谐波污染问题成为人们关注的焦点之一。该文针对环形配电网中谐波谐振现象,基于将环形配电网等效为射线型配电网的基本思想,提出一种在环形配电网中点安装等效无限长有源电力滤波器(infinite active power filter,I-APF)的谐波抑制方案。相比于在环形配电网中点安装阻性有源电力滤波器(resistive active power filter,R-APF)的传统方案,该方案不仅能够获得更好的谐波抑制效果;同时,该方案对于安装位置的改变、电容的改变和非线性负载的改变,均具有更好的适应性和谐波抑制效果。仿真分析和实验结果均验证了该方案的正确性和有效性。     

应用多级有源滤波系统的分布式电源谐波治理

有源滤波器是配电网谐波治理的动态补偿装置,但分布式电源的接入造成配电网谐波变得复杂,单一的有源滤波器在补偿线路谐波方面难以达到效果。设计了一种多级有源滤波系统,将补偿源设置在各电源母线处,得到一组含多个补偿源的分布式电源接入的配电网模型,通过调节滞环宽度,稳定开关频率。采用改进后的滞环空间矢量控制对各有源滤波单元分别进行控制,并基于MATLAB/Simulink仿真平台,分别搭建了含单一滤波器和两级有源滤波系统的分布式电源接入的配电网仿真模型,仿真对比分析了谐波治理的效果,仿真结果验证了多级有源滤波系统对分布式电源接入的配电网谐波治理的有效性和可行性。     

基于多谐波源动态运行的配电网滤波装置优化配置

在一个配电网中往往同时存在多个谐波源,且工作时间不确定,为提高遗传算法的搜索效率,利用分级递阶的自适应遗传算法对配电网中的无源滤波器(Passive Power Filter,PPF)和有源滤波器(Active Power Filter,APF)进行统一优化配置。用该算法在多谐波源动态运行的整个配电网中分级优化PPF和APF的安装地点、安装类型、安装参数,即先确定安装地点,再确定安装类型和安装组数,最后确定滤波器的参数,在满足谐波潮流约束条件的前提下,在控制滤波装置初期投资费用的同时有效抑制谐波。算例计算结果证明了该算法的有效性。     

有源滤波器在不同网络中的应用分析

介绍了并联型有源滤波器对谐波抑制的作用。基于电压检测控制的并联型有源电力滤波器相当于一个有源阻尼,对谐波分量呈现出阻抗特性,除了具有抑制谐波进入电网的能力之外,还能阻尼谐波共振。将并联型有源电力滤波器应用于两种不同类型的电力线网络,然后评估其在不同类型网络结构中的滤波和阻尼共振的性能。第一种电力网为220 V配电网,第二种电力网为简化的150 k V太阳能发电网络,容量为444.4 MVA。并且使用谐波共振模态分析和计算参与因数的方法来确定有源滤波器的最佳安置位置,使有源滤波器滤波和抑制共振的效果最优。     

在配电网谐波扩散抑制中并联有源滤波器的检测方式和安装位置研究

通过建立配电网的简化模型,探讨了单根馈线上并联型有源滤波器不同检测方式及安装位置对系统稳定性和谐波扩散抑制效果的影响.认为:最好的检测方式是检测有源滤波器安装点处的电压方式;最好的安装位置是馈线的最末端.并用仿真结果验证了相关结论的正确性.     

基于BP神经网络建模的并联型有源电力滤波器谐波综合治理控制算法

有源电力滤波器是一种用以抑制配电网谐波的治理设备,其技术成熟,具有受电网状态影响较小的优点,工作时有源电力滤波器检测补偿点的谐波电流并输出相反的电流进行抵消,以达到治理谐波的目的.然而,采用传统的控制方法时,一个有源滤波器仅能针对单个节点的谐波源进行补偿,对于含分布式谐波源的配电网来说,如需抑制电网整体的谐波,则必须安...     

并联混合型有源电力滤波器的最优安装点

着重探讨混合型有源电力滤波器最优安装点的问题。建立配电网及混合型滤波器(hybrid active power filter,HAPF)的简化模型,定义以配电网各节点母线电压总畸变量为参考量的配电网谐波治理目标函数(network objective function,NOF)。通过对配电网节点导纳矩阵的分析得到配电网的电压及电流转移矩阵,并以此研究配电网的频率响应特性,为混合型有源电力滤波器无源支路的谐振频率及参数选择提供设计参考;同时以获得最优目标函数为目的阐述HAPF最优安装点的选择方法,并着重探讨电网参数变化的影响。所述方法可推广应用于各种配电网的谐波治理与无功补偿当中,工程应用结果验证了该文理论分析的正确性。     

A shunt active filter based on voltage detection for harmonictermination of a radial power distribution line

This paper focuses on a shunt active filter based on the detection of harmonic voltages at the point of installation. The objective of the active filter is to attenuate harmonic propagation resulting from series/parallel resonance between capacitors for power factor correction and line inductors in a power distribution line. The active filter acts as a low resistor to the external circuit for harmonic frequencies, and it is installed on the end bus of the power distribution line, just like a 50 Ω terminator installed on the end terminal of a signal transmission line. Therefore, the function of the active filter is referred to as “harmonic termination” in this paper. Experimental results obtained from a laboratory system rated at 200 V and 20 kW verify that the active filter for the purpose of harmonic termination has the capability of harmonic damping throughout the power distribution line     

Experimental verification of the effect of a voltage‐detection‐based shunt active filter for harmonic damping throughout a power distribution line

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     

Power quality improvement in 3-phase 3-wire distribution systems using modular active power filter

Active power filters have been introduced for the purpose of power quality improvement. The power converter used as an active filter is rated based on the magnitude of the injected current and is operated at the switching frequency required to perform the filtering job successfully. Excessive losses are expected if the converter's power rating and switching frequency are both high. In this paper, an efficient and reliable active filter system for the power quality enhancement is proposed. The proposed filter is based on 3-phase PWM-controlled current–source converter (CSC) modules, where each filter module is dedicated to eliminate a specific harmonic and/or balance the line currents. Based on the information extracted from the line by the ADALINE, each leg of every CSC module is independently controlled to perform the balancing or/and harmonic filtering in a 3-phase 3-wire distribution system. As the harmonic order increases, the magnitudes of the harmonics decrease and their frequencies increase. Therefore, the power rating of the active filter modules will decrease and their switching frequency (bandwidth) will increase with the harmonic order. As a result, the overall switching losses are minimized due to balanced ‘power rating-switching frequency’ product. An economic study shows that the modular approach is superior to the conventional one converter scheme. Furthermore, the modular approach offers higher reliability, as the failure of one converter does not jeopardize the whole filtering mission. Speed and accuracy of ADALINE, self-synchronizing harmonic tracking, optimized dc-side current values and minimal converter losses are additional features of the proposed filter. The theoretical expectations are verified by digital simulation using EMTDC simulation package.     

Performance of automatic gain adjustment in a shunt active filter intended for installation on power distribution systems

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     

APF在万吨选矿厂低压配电系统中的节能应用

介绍了工矿企业供配电系统的特点,对新建万吨生产线低压配电系统谐波的危害、现场测试进行了详细的分析,提出了利用有源电力滤波器（APF）技术进行谐波治理的方法,并对APF基本原理进行了阐述,最后给出了治理效果。     

基于灵敏度分析的谐波治理设备多目标优化配置方法

在非线性负荷和分布式电源大量接入配电网的背景下,配置有源电力滤波器是解决电压波形畸变、谐波损耗激增、电能质量下降等一系列谐波污染问题的有效措施之一。为合理选择配电网中有源电力滤波器安装位置与容量,协调谐波治理成本和效果之间的关系,文中提出一种基于灵敏度分析的有源电力滤波器多目标优化配置方法,实现了有源滤波器位置和容量的快速求解。建立配电网谐波潮流计算模型,使用灵敏度分析方法处理所有节点,获得了安装节点集合;考虑节点电压的谐波畸变率和投资成本,建立滤波器容量优化模型;通过分解多目标进化算法求解优化模型;对IEEE 18节点配电系统进行仿真计算,结果表明了文章所提方法的有效性。     

10 kV配电网混合型有源滤波器的研制

针对中小型企业谐波治理的要求,在分析LC和LCC电路谐振特性的基础上,提出了一种新颖的谐波注入式电路。该电路减小了有源滤波部分的容量,减少了无源元器件的使用数量,占地面积小,达到了工程应用的目的。详细介绍了该系统的滤波原理、控制器结构和大功率逆变器的实现。挂网试运行结果表明,该装置滤波效果较好,可靠性高,而且这种混合型有源滤波器(HAPF)的性能价格比较高,因而具有良好的工程推广应用价值。     

Combined compensation structure of a static Var compensator and an active filter for unbalanced three-phase distribution feeders with harmonic distortion

A combined reactive power compensation method of a static Var compensator (SVC) and an active filter is described in this paper for unbalanced three-phase distribution feeders with harmonic distortion. The SVC acts as a classic reactive power compensator for load balancing and power factor correction. The small rating active filter is used to improve filtering characteristics of the passive filter in SVC and suppress possible resonance between the system impedance and the passive filter. The control signals are derived from the calculation of instantaneous active and reactive powers of the distribution feeder. Simulation results carried out by the electromagnetic transients program (EMTP) show that the proposed reactive power compensation configurations can effectively balance currents, correct power factor, and eliminate harmonic currents.