无源性控制在有源电力滤波器中的应用

线路或负载参数未知可能会导致有源滤波器系统失稳. 为解决系统的稳定性问题, 将无源性控制应用于有源电力滤波器来保证系统的稳定性. 将有源滤波器和非线性负载视为一个整体. 对负载进行诺顿等效, 把负载电压和电源电流作为状态变量, 把补偿电流作为控制变量, 建立系统在dq轴上的模型. 获得系统的控制律也就获得了补偿电流的给定值. 验证系统满足无源性条件之后, 再利用无源性控制方法获得系统的控制律. 虽然算法在理论上比较复杂, 但是实现上相当简单. 在仿真中, 对比了容性负载, 感性负载以及变动负载情况下的控制     

并联有源电力滤波器控制方式研究

针对无损耗电阻器的并联有源电力滤波器，采用一种控制算法，可实时计算出开关阵列的导通时间，实现更精确的控制。仿真结果表明，该滤波器及控制算法具有良好的谐波补偿效果。     

无源性控制在有源电力滤波器中的应用

线路或负载参数未知可能会导致有源滤波器系统失稳，为解决系统的稳定性问题，将无源性控制应用于有源电力滤波器来保证系统的稳定性。将有源滤波器和非线性负载视为一个整体，对负载进行诺顿等效，把负载电压和电源电流作为状态变量，把补偿电流作为控制变量，建立系统在dp轴上的模型。获得系统的控制律也就获得了补偿电流的给定值，验证系统满足无源性条件之后，再利用无源性控制方法获得系统的控制律。虽然算法在理论上比较复杂，但是实现上相当简单。在仿真中，对比了容性负载，感性负载以及变动负载情况下的控制效果，仿真结果表明算法具有很好的鲁棒性，并能很好的保证系统的稳定性。     

有源电力滤波器及其新进展

有源电力滤波器是一种用于动态抑制谐波，补偿无功的新型电力电子装置。本文介绍了有源电力滤波器的工作原理、特点、分类及控制策略，对有源电力滤波器技术研究的新进展进行了综述，展望了有源电力滤波器在我国的应用及发展前景。     

并联型有源电力滤波器的分数阶微积分控制策略

针对常规PID控制器由于受采样频率等因素影响而难以获得满意的控制效果的问题,研究了并联型有源电力滤波器的分数阶微积分控制策略,采用改进Oustaloup算法求解分数阶微积分。Matlab仿真结果表明,该控制策略比常规PID控制策略能更好地将直流侧电压稳定在设定值;得到的网侧电流更平滑,更接近于正弦波;在补偿瞬间的冲击电流更小,补偿跟踪电流可以很好地跟踪指令电流。     

基于改进的滞环控制策略的并联型有源电力滤波器仿真研究

针对并联型有源电力滤波器采用三角载波控制策略和滞环控制策略存在的问题,提出了一种基于改进的滞环控制策略的并联型有源电力滤波器的设计方案,分析了并联型有源电力滤波器的系统结构与原理,介绍了基于瞬时无功功率的ip、iq谐波检测方法,给出了改进的滞环控制策略的控制原理。仿真结果表明,该有源电力滤波器具有良好的谐波电流补偿性能。     

基于DSP的并联型有源电力滤波器的研制

所研制的有源电力滤波器采用以IGBT为内核的智能功率模块(简称IPM)构成三相全桥逆变主电路,控制电路的核心是32位定点DSP芯片,检测电路由电压和电流传感器主要构成。通过检测电路检测到非线性负载的谐波信号,经由DSP运算转换并发出PWM的脉冲信号,控制逆变器产生符合要求的补偿电流到电网。     

并联型有源电力滤波器(APF)的仿真模型

对并联型有源电力滤波器系统的电路结构、控制方法、工作原理、系统特性进行了分析和探讨，并利用Matlab中的电力系统仿真工具箱对其进行了建模和仿真。并联型有源电力滤波器适用于多种负载条件下的谐波和无功补偿，尤其是能应用于电源电流畸变和不平衡条件下。稳态仿真结果表明，该方案具有很好的谐波补偿效果、并且具有通用性。有源电力滤波器是一种满足谐波标准要求、且能很好地解决谐波问题的装置。     

基于 DSP 的并联型电力有源滤波器的研究

文章提出了采用电力有源滤波器补偿电力系统谐波的方案,并以并联有源电力滤波器为研究对象,对其拓扑结构、补偿分量的检测算法、控制策略等问题作了较系统的研究,在该基础上介绍了一种基于DSP的并联型有源滤波器的设计。通过仿真实验对有源滤波器数学模型、检测算法及控制策略的有效性和实用性进行了验证。     

一种新型的并联型单相有源电力滤波器

通过分析并联型有源电力滤波器的工作原理和系统结构,本文提出一种新型的电流闭环预测控制策略,相比于传统的PI控制、滞环控制和预测控制算法,该预测策略能减小计算量,并降低模型的复杂度。同时,谐波电流检测电路采用单相电流延迟60°构造三相电流d-q变换法,获取逆变主电路的参考电流。该滤波系统还引入PI外环以稳定直流侧的电容电压。最后,采用S imu link的电力系统分析模块进行仿真。结果表明,该滤波系统可有效检测高次谐波分量,迅速补偿谐波电流,同理论分析一致。     

并联混合有源滤波器哈密顿系统建模及无源控制

并联混合有源滤波器(SHAPF)的控制策略是决定其稳定性和谐波治理效果的关键因素之一,利用SHAPF自身的无源性设计控制器可以取得比常规控制器更好的控制效果.首先建立了SHAPF端口受控哈密顿系统模型,然后基于互联和阻尼配置无源控制方法,提出了一种新的SHAPF非线性控制策略,从理论上保证了闭环系统的渐进稳定.最后仿真实验证明了该控制策略能够有效消除电网中的谐波电流,与传统线性二次型调节器(LQR)相比,该控制策略具有更好的稳态补偿效果和对负载变化的干扰抑制能力.     

并联混合有源滤波器逆系统解耦控制

针对并联混合有源滤波器(SHAPF)这一强耦合非线性系统的控制问题,提出了一种基于逆系统方法的SHAPF反馈线性化解耦控制策略.首先根据SHAPF非线性数学模型,采用逆系统方法生成其α阶积分逆系统,进而构造出解耦的伪线性系统,然后利用极点配置方法对伪线性系统进行综合,设计了系统的闭环控制器,并给出了系统零动态的镇定条件,保证了闭环控制系统的稳定性.最后仿真实验表明该控制策略能够有效消除电网中的谐波电流,并且与传统线性反馈-前馈控制策略相比,该控制策略具有更好的动静态性能.     

一种新型有源电力滤波器电流控制策略研究

针对现有有源电力滤波器结构较为复杂、谐波电流跟踪困难等问题,提出了一种新型有源电力滤波器电流控制策略。该控制策略不需要进行负载电流测量与谐波检测,而是直接在电网侧提取电网电流,并将比例积分与矢量比例积分控制器结合使用以对电网电流进行控制,从而实现谐波补偿。仿真结果证明了该策略的正确性与有效性。     

Robust nonlinear control of shunt active filters for harmonic current compensation

An advanced control strategy of shunt active filters (SAF) aiming to compensate for harmonic current in the electric supply grid is proposed. The SAF considered here is suitable for three-phase three-wire current harmonic compensation and is based on AC/DC three-phase boost converter topology. Robust control of the active-reactive current/power delivered by the SAF is designed exploiting the internal model principle. The stabilization of the DC-link voltage dynamics is addressed along with the fulfillment of the harmonics compensation objective. The two-time scale behavior of the SAF is exploited to apply the averaging theory in the control design. Experiments are provided to show the effectiveness of the proposed solution.     

Experimental modeling and control design of shunt active power filters

One of the main issues when designing a control strategy for a power electronic system is the development of a reliable model of the real system. However, the evaluation of the actual plant parameters is difficult due to the mismatch between nameplate and actual values of components, and the presence of unmodeled dynamics and non-linearities. This paper presents a novel technique for both model parameters identification and optimized control design of a shunt active power filter system using genetic algorithms (GAs). Experimental results demonstrate that the proposed modeling and control design approach greatly improve the system performance.     

Increasing the operating area of shunt active filters by advanced nonlinear control

This work is aimed to rigorously manage voltage saturation and maximum current constraints in Shunt Active Filters. In this respect, assuming "unconstrained" control algorithms have already been defined to achieve standard objectives for such devices(i.e. current tracking for harmonic compensation and DC-bus voltage boundness), a plug-in unit, oriented to extend the system operating region and at the same time preserving good performance under large transients and overload conditions, is presented.This solution allows to improve availability, robustness and composability of Shunt Active Filters, which are expected to be key features in present and next generation complex and possibly "smart" power grids. The proposed unit is composed by two parts.First, a suitable anti-windup strategy is defined in order to deal with control input saturation. Its main purpose is to preserve the original "unconstrained error dynamics", in face of input saturation, while guaranteeing low computational burden and reduced performance impairment(the latter goal, in harmonic compensation context, leads to rather non-standard problem formulation).To this aim, the anti-windup acts on the current references through a suitably-designed additional dynamics. Then, in order to cope with current limitations, an additional strategy has been designed; again the current references is suitably shaped to comply with the features and bounds of the system, augmented with the above-mentioned anti-windup solution. The proposed scheme can be simply joined to any kind of unconstrained controller adopted to steer Shunt Active Filters. In this work, an Internal-Model-based current controller is adopted as a benchmark case. The proposed approach is validate through extensive simulation tests.     

Hierarchical neuro-fuzzy current control for a shunt active power filter

This paper presents the design of a hierarchical neuro-fuzzy current control scheme for a shunt active power filter compared with a single fuzzy controller scheme. A single fuzzy controller scheme is presented first and an ANFIS based neuro-fuzzy controller is connected hierarchically to the first one to improve the performance. Simulation results show that harmonic compensation is achieved with both schemes, however switching performance is superior for hierarchical scheme. The method of switching controller development in this paper is new and can be applied to other power electronic converter applications for improved performance.     

Cascade nonlinear control of shunt active power filters with average performance analysis

The problem of controlling single-phase shunt active power filters is addressed in presence of nonlinear loads. The control objective is twofold: (i) compensation of harmonic and reactive currents absorbed by the nonlinear load, this objective is referred to as power factor correction (PFC); (ii) regulation of the inverter output capacitor voltage. A two-loop cascade control strategy is developed that includes an inner-loop designed, using the Lyapunov design approach, to cope with the compensation issue and an outer-loop designed to regulate the capacitor voltage. The controller performances are formally analysed using system averaging theory. The theoretical results are illustrated by simulation.