基于TMS320LF2812的并联型有源电力滤波器的设计与实现

针对谐波抑制和无功补偿的问题,对有源电力滤波器进行一系列研究,阐述了有源电力滤波器的基本原理以及控制策略。基于TMS320LF2812设计了有源电力滤波器,包括DSP控制板、电压采样电路,电流采样电路以及IPM功率单元的设计,并给出了有源电力滤波器的软件设计。最后利用MATLAB仿真软件对所涉及的有源电力滤波器进行仿真,验证了有源滤波器系统的正确性以及谐波补偿电流和滞环比较控制模块的有效性。     

电力有源滤波器在供电系统中的应用（续）

电力有源滤波器在供电系统中的主要应用是补偿电网中的谐波和无功功率,依此改善交流电源的供电质量。文中介绍了电力有源滤波器的电路结构以及控制方式。给出了电压型电力有源滤波器、电流型电力有源滤波器、多模式电力有源滤波器以及混合型电力有源滤波器的电路结构,并重点介绍无功电流和谐波电流的检测、逆变器直流侧电源电压的控制以及混合型电力有源滤波器的控制方案,最后给出了电力有源滤波器的补偿特性。     

电力有源滤波器在供电系统中的应用

电力有源滤波器在供电系统中的主要应用是补偿电网中的谐波和无功功率,依此改善交流电源的供电质量。文中介绍了电力有源滤波器的电路结构以及控制方式。给出了电压型电力有源滤波器,电流型电力有源滤波器,多模式电力有源滤波器以及混合型电力有源滤波器的电路结构,并重点介绍无功电流和谐波电流的检测,逆变器直流侧电源电压的控制以及混合型电力有源滤波器的控制方案,最后给出了电力有源滤波器的补偿特性。     

基于瞬时无功功率理论的APF的研究与仿真

本文介绍了并联型有源电力滤波器的工作原理和基于瞬时无功功率理论的谐波和无功电流检测方法,用Matlab SimUlink建立了带典型负载的电力有源滤波器的仿真模型,模拟实际系统,用于检验其策略和参数在实际条件下的工作情况。仿真模型的结果表明：基于瞬时无功功率理论的有源滤波器,可以很好的起到动态抑制电网谐波和补偿无功的作...     

选择性有源滤波器治理12脉波整流器的谐波

文章介绍12脉波整流器应用选择性有源滤波器抑制谐波电流和补偿无功,采用基于瞬时功率理论的谐波和无功电流检测方法。对有源滤波器和负荷系统进行仿真,并对仿真结果进行详细分析。仿真结果表明：基于瞬时功率理论的谐波和无功电流检测方法可以准确、实时地检测出三相电流中的任意次谐波及无功电流,有源滤波器抑制11次和13次谐波电流,并补偿无功。     

混合有源电力滤波器的仿真研究

分析混合有源电力滤波器的补偿原理和补偿特性,该滤波器能够很好地改善无源滤波器的滤波性能,实现大功率下的谐波抑制和无功功率补偿.最后,建立仿真模型,并对波形作出分析.     

补偿电铁谐波及无功电流的有源滤波器的研究

研究应用于补偿电铁谐波及无功电流的单相有源滤波器,基于鉴相原理的谐波及无功电流检测法适合于作为电铁谐渡及无功电流的检测方法,改进的三角波调制电流控制方法能对电铁系统中的谐波及无功电流起到很好的补偿作用.仿真结果表明有源滤波器能够达到综合补偿的目的.     

混合有源电力滤波器的仿真研究

分析混合有源电力滤波器的补偿原理和补偿特性,该滤波器能够很好地改善无源滤波器的滤波性能,实现大功率下的谐波抑制和无功功率补偿。最后,建立仿真模型,并对波形作出分析。     

基于双反星形整流器负载的TAPF补偿方案研究

针对目前电解电镀等工业应用中快速变化的强非线性负载产生大量谐波和无功的问题,以混合型有源电力滤波器TAPF的谐波与无功补偿技术为背景,基于双反星形整流器负载将传统的阻抗型补偿装置TSC和并联型APF相结合构成TAPF补偿系统。由TSC进行大容量无功补偿,APF进行谐波电流补偿,以使系统具有优良的谐波与无功补偿特性及自适应性,提高了电网电能质量。仿真结果表明,该TAPF补偿方案对工业中应用双反星形整流器负载所引起的一系列与谐波和无功有关的电能质量问题进行了很好的解决。     

有源电力滤波器的设计

有源电力滤波器(Active Power Filter)是目前研究比较深入的一种装置,它是一种用于动态补偿,既可抑制谐波,又可以补偿无功的新型电力电子装置,它能对大小和频率都变化的谐波以及变化的无功进行补偿,其应用可克服LC滤波器等传统的谐波抑制和无功补偿方法的缺点。     

Neural Network-Based Selective Compensation of Current Quality Problems in Distribution System

Active power filters (APFs) have been used to compensate harmonics, reactive current, and negative sequence fundamental frequency current drawn by nonlinear loads. The control of APF is the core issue for their proper operation. The flexibility of selective compensation embedded in the control scheme makes APF versatile for compensation of reactive power, harmonic currents, and unbalance in source currents and their combinations, depending upon the limited rating of voltage source inverter employed as APF. The proposed scheme utilizes neural network-based decomposition of the load current into positive and negative sequence fundamental frequency component, reactive component and harmonic components. The adaline-based current decomposer estimates the reference currents through tracking of unit vectors together with tuning of the weights. The implementation of the control scheme facilitates selective compensation which respects the limited rating of the APF. The simulated results using developed MATLAB model are presented and are validated by experimental results to depict the effectiveness of the proposed control method of APF     

A novel shunt hybrid active power filter based on magnetic flux compensation

In this article, the principle of a novel shunt hybrid active power filter (APF) based on magnetic flux compensation is proposed. The parallel transformer can exhibit nearly zero impedance to harmonic current whereas the zero magnetic flux condition is satisfied for harmonics, which leads harmonic current to flow into the transformer branch. Meanwhile, the transformer can exhibit continuously adjustable impedance to the fundamental current based on fundamental magnetic flux compensation, which works together with the passive power filter to compensate for reactive power. A mathematical model is established for system stability analysis and steady state estimation. The experimental results verify that the performance of the proposed APF is satisfactory in harmonic suppression as well as reactive power compensation.     

基于DSP的D-STATCOM硬件实现及控制算法

针对电网无功功率实现动态无功补偿的问题,采用模块化的设计方法,设计出一种基于DSP的D-STATCOM电路。根据瞬时无功功率理论计算参考电流和补偿电流,并采用直接电流控制方法产生补偿电流。建立了整个补偿过程的数学模型,分析了D-STATCOM中电流控制算法、电压控制算法以及IGBT晶闸管通断时间控制算法。结果表明:D-STATCOM完成无功补偿,达到抑制谐波的目的。     

强谐波环境下的无功功率补偿技术

非线性功率用电设备产生谐波电流,导致电磁干扰、功率因数降低,由电容器、串联电抗器组成的谐波滤波装置具有谐波滤除和无功补偿两大功能。工作时不会像传统电容器组补偿那样,在提高功率因数的同时对高次谐波进行放大,而是对谐波进行吸收,提高电源质量。在电抗性补偿系统里,根据需要被补偿的功率计算得出电容,串联谐振电路的串联谐振频率由...     

One-cycle control of three-phase active power filter with vector operation

Active power filters (APFs) provides an effective measure to eliminate the power line harmonic/reactive currents generated by nonlinear loads or by distributed energy sources that are connected to the grid. Active power filters are typically connected in parallel to the harmonic/reactive current sources and cancel the harmonic/reactive components in the line current so that the current flow into and from the grid is sinusoidal and in phase with the grid voltage. Since the APFs process only the harmonic/reactive power, their power-handling capability can be much higher than that of the cascade power-factor-correction methods. In this paper, the one-cycle control method is extended to control three-phase APFs. The proposed control approach employs one integrator with reset along with several logic and linear components to control a voltage-source converter to achieve three-phase unity power factor for the current to and from the power grid. No multipliers or sensors for the load current and the APF inductor current are required. Furthermore, there is no need to calculate the reference for controlling APF inductor current so that complicated digital computation is eliminated. The operation switching frequency is constant that is desirable for industrial applications. The proposed control approach features great simplicity, excellent harmonic/reactive current cancellation, and solid stability. It is a cost-effective solution for power quality control for electronic equipment, buildings, industrial facilities, ships, airplanes, distributed power generation stations, etc. All findings are supported by experimental results.     

A novel open-loop control method for a current-source active power filter

This paper presents a new control system for a current-source active power filter. The harmonic current compensation is realized using only a feedforward control of the load currents. The LC filter resonance of the converter is damped in an open-loop manner using the dynamic equations of the supply filter. The benefits of the proposed control system are that it is simple and straightforward, the number of measurements and sensors can be minimized, and also that the LC filter size can be optimized according to proper harmonic distortion level of the supply currents without care about the stability issues of the closed-loop system. This usually leads to reduction of the filter size. Also, the changes in fundamental current components of the active filter can be effectively realized when the active power filter can also be used as a fast reactive power compensator. The control system also includes the calculation delay compensation of the digital control system. The control system is realized using a single-chip Motorola MPC555 microcontroller. The tests with the prototype show effective current harmonic compensating performance of the nonlinear loads.     

基于传统功率理论谐波抑制和无功补偿方法

基于传统功率理论，提出了一种谐波抑制和无功补偿方法，根据有功功率可求等效线性负载，进一步求得该时刻补偿电流值。应用于有源电力滤波器控制中，可有效地抑制谐波电流和补偿无功功率，减小了电流信号检测中偶然误差对补偿效果的影响。这种方法可以应用在单相、三相电力系统的滤波电路中。仿真证明了这种方法的有效性。     

谐波情况下的无功补偿设计

本文分析了系统谐波的主要成分,指出了内网谐波和外网谐波对无功补偿的影响,详细讲述了无功补偿串接电抗器和并联谐波滤波器的设计计算方法,尤其是在既有内网谐波又有外网谐波情况下无功补偿滤波器的设计方法。     

A three-phase active power filter operating with fixed switchingfrequency for reactive power and current harmonic compensation

The performance and dynamic characteristics of a three-phase active power filter operating with fixed switching frequency is presented and analyzed in this paper. The proposed scheme employs a PWM voltage-source inverter and has two important characteristics. First, it operates with fixed switching frequency, and second, it can compensate the reactive power and the current harmonic components of nonlinear loads. Reactive power compensation is achieved without sensing and computing the reactive component of the load current, thus simplifying the control system. Current harmonic compensation is done in time domain. The principles of operation of the proposed active power filter along with the design criteria of the power and control circuit components are discussed in detail. Finally, experimental results obtained from a 5 kVA prototype confirm the feasibility and the features of the proposed system