三相四线制并联型有源电力滤波器研究

介绍了三相四线并联型有源电力滤波器的基本原理,谐波检测方法以及控制策略.本文采用电流闭环PI结合电压前馈控制补偿电流发生环节,建立了并联型三相四线制有源电力滤波系统的仿真模型并进行了仿真.仿真结果表明该并联型有源电力滤波器能有效地补偿三相电流及中线电流,论证了其补偿电流检测方法及控制方案的可行性.     

三相四开关并联型有源电力滤波器的指令电流确定方法

该文提供一种低成本的三相四开关并联型有源电力滤波器以适用于中、低压系统同时进行谐波电流抑制和无功功率补偿。通过对该三相四开关并联型有源电力滤波器工作原理的分析,采用直接将期望得到的电网正序基波电流作为该三相四开关并联型有源电力滤波器指令电流信号的控制方法。为保证在电网电压不平衡和电网出现短时故障等情况下,三相四开关并联型有源电力滤波器仍能安全有效的工作,引入正序基波电流幅值校正环节和正序基波电压相角检测器;为实现直流侧中点电压平衡,采用一种基于比例控制算法的直流侧电压偏置补偿器。相关的仿真与实验结果均证明该指令电流确定方法的可行性和有效性。     

并联型有源电力滤波器在非理想电源电压下的控制

首先提出了并联型有源电力滤波器在不对称、非正弦电源电压情况下补偿电流指令的准确计算方法。该方法基于同时对三相电压、电流进行旋转坐标变换和投影变换。所求得的补偿电流指令为非线性负载电流中除了基波正序有功分量之外的全部电流分量。应用于三相三线制电路时，该方法可以计算任意次谐波电流的瞬时值。进一步提出了在不对称、非正弦电源电压情况下，并联型有源电力滤波器产生补偿电流的无差拍控制法。理论分析、仿真及实验结果表明了所提出的计算和控制方法的有效性，从而为并联型有源电力滤波器在非理想电源电压条件下的正确控制提供了一条有效途径。所提出的方法对其它类型有源电力滤波器的控制也有借鉴意义。     

神经网络控制的三相并联有源电力滤波器设计

针对现有各种谐波检测方法的不足,在分析了滤波器的工作原理和传统的神经网络控制算法之后,提出了一种新的神经网络控制算法,设计了一种应用于电力系统中补偿无功和抑制谐波的三相并联有源电力滤波器(APF),该滤波器由一个三相PWM电压源逆变器及其控制电路组成。将负载电流、直流侧电容电压与系统电压输入改进的神经网络,计算出并联有源电力滤波器的参考电流,参考电流输入滞环电流控制器获得逆变器的触发脉冲,从而得到补偿电流。通过Matlab仿真表明,由改进的神经网络控制的滤波器,在负载变化及其电流变化情况下都有良好的性能。同时,通过数字信号处理器实现的系统实验验证了该方案的正确性。     

一种用于并联型有源电力滤波器的离散解耦控制方法

为解决三相三线并联型有源电力滤波器(APF)电流之间的耦合问题,在应用谐波与瞬时无功电流检测算法的基础上,提出了一种离散解耦控制策略.该方法基于α-β变换,建立了α-β坐标系下的三相三线并联型APF数学模型,推导了中性点电压对电流控制的影响.在(-(域中采用两个电流控制器实现了APF系统的电流解耦控制,有效消除了中性点电压的影响.该方法易于数字化实现,减少了计算量.理论推导和仿真实验表明了该方法的正确性和有效性.     

新型混合有源滤波装置的电流控制策略研究

针对混合有源电力滤波装置中有源滤波部分容量大小的问题,提出一种三相三线制并联型混合有源电力滤波装置的新型拓扑结构.这种混合有源滤波装置中每一相的无源滤波器与一个小的附加电感串联,并且这个附加电感通过一个单相耦合变压器与有源滤波器并联.其中,有源滤波器被控制成一个谐波电流源.这个附加电感为滤波支路的基波电流提供了通路,并且能够减小有源滤波器的输出电压.因而,有源滤波器的容量得到了有效的降低.详细介绍了包括负载电流检测、系统电流电测和复合控制的统一控制策略,并且讨论了该装置的有源滤波器的容量要求.最后,计算机仿真结果和实验样机的实验结果证实了所提出的新型混合式有源滤波器拓扑结构和统一控制策略是可行的并且是有效的.     

基于DSP三相四线制有源电力滤波的研究

介绍了并联型有源电力滤波器的工作原理、基本结构和控制策略,然后利用MATLAB/Simulink中的电力系统仿真模块箱(PSB)建立了有源电力滤波器系统的仿真模型并进行了仿真.ip-iq法由于实时性较好,在三相电压畸变的情况下能准确地检测谐波分量.仿真结果表明,采用的ip-iq谐波电流检测方法和滞环控制方法的准确性,电流补偿效果达到设计要求.最后,在TMS320F2812的DSP平台搭建了控制模块,实验表明有源电力滤波在ip-iq的谐波检测和滞环控制下具有较好的滤波效果.     

一种单相有源电力滤波器单周控制模型的研究

本文研究了单相并联型有源电力滤波器的单周控制方法。单周控制方法应用于有源电力滤波器的优点在于：避免了复杂的畸变电流检测过程和复杂的控制电路，而是把畸变电流的检测过程与有源电力滤波器的控制过程一次完成，具有很好的实时性和控制电路简单等优点。本文对于单相并联型有源电力滤波器提出了一种新型单周控制方法。通过对主电路的分析，导出了该滤波器在三相四线制系统中单周控制的数学模型，并在此基础上进行了仿真研究。仿真结果证明了该方法的正确性和有效性。     

并联型有源电力滤波器直流电容电压的控制

控制有源电力滤波器(APF)直流侧电压为适当值是保证其具有良好补偿性能的一个重要因素,以并联型有源电力滤波器交流和直流侧瞬时功率平衡为基础,对并联型有源电力滤波器直流电容平均电压与脉动电压的变化规律进行研究,分析了它们对并联型有源电力滤波器性能的影响。为了克服这种影响,提出了在补偿电流中注入基波有功电流和增大直流侧电容量控制直流电压稳定的一种方法。仿真结果验证了所提出方法的正确性和有效性。     

并联型有源电力滤波器直流电容电压的控制

控制有源电力滤波器(APF)直流侧电压为适当值是保证其具有良好补偿性能的一个重要因素,以并联型有源电力滤波器交流和直流侧瞬时功率平衡为基础,对并联型有源电力滤波器直流电容平均电压与脉动电压的变化规律进行研究,分析了它们对并联型有源电力滤波器性能的影响。为了克服这种影响,提出了在补偿电流中注入基波有功电流和增大直流侧电容量控制直流电压稳定的一种方法。仿真结果验证了所提出方法的正确性和有效性。     

有源电力滤波器自校正预测控制方法

提出了基于预测控制和空间矢量调制的有源电力滤波器输出补偿电流控制方法.利用外推拉格朗日插值法对有源电力滤波器输出电压进行线性预测,并对其引入校正因子,得出了基于自校正的无差拍指令电压计算模型,以实现对输出补偿电流的闭环无差拍控制;随后在对指令电压进行空间矢量调制过程中简化传统的矢量定位方法,并优化空间矢量的作用时序以降低功率器件的开关损耗.在电网电压不对称且存在畸变条件下的理论分析和仿真结果证明该方法能有效的跟踪指令电流的变化.以此为基础设计一套三相并联型有源电力滤波器,并在10 kV电力系统试运行,实验结果验证了该控制方法的有效性.     

三相四线制有源电力滤波器的研究及仿真

分析了三相四线制四桥臂有源电力滤波器的工作原理,提出基于瞬时无功功率理论的谐波检测方法。建立了四桥臂带输出电感的三相四线制的数学模型。基于dq0坐标系下数学模型,采用电流内环的基于前馈解耦PI控制方法,以及PI参数的设计方法。利用三维空间矢量脉宽调制技术(3D-SVPWM)进行电流跟踪控制逆变器的输出,易于数字实现,直流电压利用率高。通过Matlab仿真及试验证明了三相四线制有源电力滤波器系统对三相不平衡四线制系统的三相谐波及无功电流与中性线电流有效的补偿效果。     

A three-phase line-interactive UPS system implementation with series-parallel active power-line conditioning capabilities

This paper presents a three-phase line-interactive uninterruptible power supply (UPS) system with series-parallel active power-line conditioning capabilities, using a synchronous-reference-frame (SRF)-based controller, which allows an effective power-factor correction, load harmonic current suppression, and output voltage regulation. The three-phase UPS system is composed of two active power filter topologies. The first one is a series active power filter, which works as a sinusoidal current source in phase with the input voltage. The other is a parallel active power filter, which works as a sinusoidal voltage source in phase with the input voltage, providing to the load a regulated and sinusoidal voltage with low total harmonic distortion. Operation of a three-phase phase-locked loop structure, used in the proposed line-interactive UPS implementation, is presented and experimentally verified under distorted utility conditions. The control algorithm using the SRF method and the active power flow through the UPS system are described and analytically studied. Design procedures, digital simulations, and experimental results for a prototype are presented to verify the good performance of the proposed three-phase line-interactive UPS system.     

A novel adaptive HBCC technique for three-phase shunt APF

This paper proposes an important improvement of the hysteresis band current control (HBCC) technique for three-phase shunt active power filter (APF) to eliminate harmonics and to compensate the reactive power generated by three-phase rectifier. In this technique, a simple and quick prediction of the hysteresis band is added to a phase-locked-loop (PLL) control to ensure constant switching frequency and synchronization of modulation pulses independently on system parameters. This allows the advantages of quick response, good current tracking accuracy and minimal ripple in three-phase systems. This technique is robust and it is characterized by the simplicity, this aspect is very significant for a practice realization because it constitutes the factors which determine the cost and the reliability of industrial assembly. The proposed technique determines the switching signals of the three-phase shunt APF and the algorithm which is based on the dc bus capacitors voltage regulation using proportional-integral (PI) controller is used to determine the suitable current reference signals. The behavior of the proposed technique has been fully verified by digital simulation, where the obtained results show that the proposed technique can improve shunt APF performances noticeably.     

Experimental Verification of Photovoltaic-based Three-phase Four-wire Series Hybrid Active Power Filter

Abstract—This article proposes a photovoltaic and battery interfaced series hybrid active power filter, which is comprised of a series active power filter and an inductor-capacitor (LC) shunt passive filter. The main benefits of the proposed system provide the compensation against the voltage harmonics, current harmonics, and voltage interruption for the whole day. A series active power filter demands a source of energy for compensating the voltage sag/swell. The proposed topology utilizes the green energy source with an energy storage unit to meet the DC-link voltage requirement of the series active power filter. The control strategy is based on the dual formulation of the compensation system principles with adaptive fuzzy logic controller. The simulation and experimental studies are carried out to validate the effectiveness of the proposed photovoltaic interfaced three-phase four-wire series hybrid active power filter.     

基于DSP-FPGA全数字控制的并联有源电力滤波器

简要分析了并联有源电力滤波器的工作原理,选取含有裂相电容的三桥臂电压源型逆变器作为系统主电路,输出电流采用动态滞环控制.针对三相四线系统,且考虑电网电压畸变和不对称情况,给出一种基于瞬时功率理论实现无功功率和谐波全补偿的控制策略,并设计了基于DSP-FPGA的全数字控制系统.仿真和实验结果验证了控制策略的正确性.     

模糊PI控制三相四开关并联型APF研究

提供一种低成本的三相四开关并联型有源滤波器(Three-phase Four-switch Shunt Active Power Filter,简称TFS-APF),将其用于中、低压系统,可同时实现谐波电流抑制和无功功率补偿.采用直接将期望得到的电网正序基波电流作为TFSAPF指令电流信号的控制方法.为进一步提高检测算法的响应速度和自适应能力,引入模糊PI控制器.仿真与实验结果均证明TFSAPF及其指令电流检测算法的可行性和有效性.     

有源电力滤波器自适应电网电流滞环控制

简要介绍了基于有功能量平衡原理的控制方法,将自适应电网电流滞环控制方法应用于三相四线制有源电力滤波器。该方法主要根据电网电压、有源电力滤波器接入点电压和电网电流的微分改变滞环电流宽度,从而实现开关频率的稳定;通过改变补偿电流的波形实现电网电流的正弦化,且在负载变化时,电网电流能实现动态稳定。该方法的特点是不需要传统的谐波电流检测,可实现数字化控制。使用Matlab仿真,其结果证明了该方法对三相四线制有源电力滤波器进行定频控制是可行的。     

A Low-cost Reconfigurable Field-programmable Gate Array Based Three-phase Shunt Active Power Filter for Current Harmonic Elimination and Power Factor Constraints

Non-linear loads, such as switched mode power supply, adjustable-speed drives, arc furnaces, etc., result in deterioration of power quality in terms of current harmonics and reactive power demand. Shunt active power filters are widely used to compensate the current harmonics, thereby improving power quality. Digital signal processors and microcontroller units used in digital control of shunt active power filters are constrained by a complex algorithm structure, adaptability, accuracy, the absence of feedback loop delays, and larger execution time. Shunt active power filters require a faster computation update rate to maintain the closed-loop bandwidth, accurate sensing of voltage and current, proper estimation of parameters, and a high frequency pulse-width modulation. In this article, a low-cost single all-on-chip field-programmable gate array implements the digital control of a three-phase shunt active power filter. This proposed implementation scheme has much less execution time and boosts the overall performance of the system. All required tasks of a typical shunt active power filter are implemented with a low-cost single all-on chip field-programmable gate array module that provides freedom to reconfigure for any other applications. Additional features, such as anti-windup, over-sampling, and time multiplexing, are also added to improve the overall performance. The proposed system is designed to meet IEEE 519 and IEC EN 61000-3 recommendations in terms of harmonic elimination and unity power factor requirements. The entire algorithm is coded, processed, and simulated using Xilinx 12.1 ISE Suite to estimate the advantages of the proposed system. This code is also defused on the low-cost single all-on-chip Xilinx Spartan 3A DSP-XC3SD1800 laboratory prototype, and experimental results obtained match with simulated counterparts. The proposed control scheme for the shunt active power filter results in reduces current harmonics under dynamic and steady-state operating conditions.