并联型有源电力滤波器参考电流获取的新方法  

A NOVEL METHOD OF CALCULATING CURRENT REFERENCE FOR SHUNT ACTIVE POWER FILTERS

作　　者：公茂忠[1] 刘汉奎[1] 顾建军[1] 徐殿国[1] 

机构地区：[1]哈尔滨工业大学电气工程系,黑龙江哈尔滨150001

出　　处：《中国电机工程学报》2002年第9期43-47,共5页Proceedings of the CSEE

摘　　要：提出了一种计算并联型有源电力滤波器电源电流参考信号和补偿电流指令信号的新方法。该方法通过对电源电压进行谐波分析,得出电压的基波正序分量,由此来确定电源电流参考的相位信息;同时从能量平衡的角度确定电源电流参考信号的幅值信息。另外,为了消除在对Fourier算法离散化时由于内部时钟与电网周期不完全同步引起的积累误差,采用了在滑动时间坐标系中进行Fourier分析的方法。文中所提方法,完全用软件实现了参考信号的同步,从而省去了产生参考同步信号的硬件电路。该方法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压畸变和不平衡条件下。在样机上对算法进行了实验,实验结果验证了该方法的正确性和可行性。A new method to calculate the source current reference and the compensating current reference for shunt active power filter (APF) is presented. The fundamental positive component, which is employed to determine the phase angle of the source current reference, is obtained by performing harmonic analysis on the source voltage, while the magnitude of the source current reference is determined from the viewpoint of energy-balance. The Fourier analysis is carried out in a sliding coordinate system, eliminating the accumulated error caused by the difference between the internally generated time reference and the line cycle when performing discretization on Fourier algorithm. The proposed method, which realizes the synchronization through software implementation, makes it unnecessary for an extra synchronization circuit to the grid. The APF prototype bared on the proposed approach works well under various load conditions, especially in the case of a distorted or unbalanced supply. Experimental results obtained from a prototype confirm the validity and feasibility of the proposed method.

关 键 词：并联型有源电力滤波器 参考电流获取 谐波分析 无功功率补偿 电力系统 

分 类 号：TM713.8[电气工程—电力系统及自动化] TM714.3