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基于特定消谐法控制的有源电力滤波器的研究
【作者】 刘辉；
【作者基本信息】 太原科技大学 ， 电力电子与电力传动， 2009， 硕士
【摘要】 面对日益严重的“电网污染”,电网净化已引起越来越多的关注。由于有源电力滤波器在谐波抑制、无功补偿、平衡三相不平衡系统、电压调节以及闪变抑制等诸多方面已取得了良好的效果,弥补了无源电力滤波器的不足,被公认为是综合治理“电网污染”的有效手段之一。本文通过对有源电力滤波器(Active Power Filter,简称“APF”)特定消谐控制策略的研究,为有源电力滤波器技术提供了一种有效的控制、分析和设计方案。首先,为了减少谐波的含量,实现主电路模块化,本文的主电路采用了具有独立直流电源的级联式多电平逆变器结构,并构建了仿真模型,验证了其可行性。其次,针对谐波电流检测精度不高、响应慢、谐波补偿效果不好等情况。本文采用了瞬时无功功率理论的p-q算法和ip-iq算法,并给出了该理论在三相电路中任意次谐波和无功电流检测的仿真实验研究。然后,本文重点介绍了特定消谐控制算法,研究了MATLAB中的曲线拟合技术、非线性方程组的求解,并提出了一种基于曲线拟合技术的特定消谐控制的电流控制策略,该控制算法使系统响应迅速,且具有满意的控制精度,仿真结果验证了该方法的可行性。最后,本文构建了一种基于MATLAB/Simulink特定消谐控制的并联混合型有源电力滤波器的仿真模型。通过仿真实验研究表明,该方案在电网电流存在畸变的情况下,能很好地跟踪检测谐波并选择性的消除谐波,而且具有很好的动态响应和较高的检测精度以及快速补偿谐波等优点,最终达到了改善优化电网质量的目的。
【Abstract】 More and more attentions have been paid to" power clean "for the serious "power pollution "problem. Active power filter overcomes the drawbacks of passive power filter and has many multifunctions, such as harmonic compensation, reactive power compensation, flicker/imbalance compensaiton and voltage regulation, so it has been considered as one of the most effective methods to suppress the serious "Power Pollution" problem. In this paper, a study on the selected harmonic elimination control algorithm of active power filter is to provide a kind of effective control scheme, analysis and design methods for active power filter.First of all , the cascaded multilevel inverter with direct current power supply is adopted in this paper in order to reduce the harmonic content and realize the modularization. The feasibility is verified by corresponding simulation.Secondly, according to the low detection precision, slow response and poor effect of harmonic compensation of the harmonic current detection algorithm, the paper introduces p-q algorithm and ip-iq algorithm based on the instantaneous reactive power theory, and the simulation experiment study on the detection of random and reactive harmonic in three-phase circuit is given.Thirdly, selected harmonic elimination control algorithm is introduced by studing Curve Fitting Technique (CFT) and solving nonlinear equations. Moreover selected harmonic elimination control algorithm based on CFT is presented. The rapid response and satisfactory control precision are obtained by using this control algorithm. The feasibility is verified by simulation results.Finally, the paper constructs a simulation model of shunt hybrid active power filter based on MATLAB/Simulink selected harmonic elimination. It can well detect the harmonic by the simulation experiment. Selected harmonic elimination has many virtues such as good dynamic response, much higher detection precision and quick compensation to harmonic current. It can reach the goal to improve and optimize the quality of the electricity networks.