电力系统谐波不稳定及相应对策的研究  

Power System Harmonic Instability and Countermeasures

作　　者：赵贺[1] 钱峰[1] 汤广福[1] 

机构地区：[1]中国电力科学研究院,北京市海淀区100192

出　　处：《中国电机工程学报》2009年第13期29-34,共6页Proceedings of the CSEE

基　　金：国家重点基础研究发展计划项目(973项目)(2004CB217907)~~

摘　　要：近年来在一些工厂、港口发生局部电力不稳定,表现为电压和频率剧烈变化随即停电。该文说明此现象属于谐波不稳定,而产生的原因主要是电力电子装置产生的谐波过大,导致同步锁相失败。该文提出良好的强靭锁相的必要条件是被锁相的电压应处理成三相系统的基频电压分量,同时必须是三相基波的正序分量。为达到正确处理带有谐波三相不平衡的电压,采用"滑动傅里叶方法"和"滑动对称分量法",可用极少量的计算取出正序基波电压。为串联电力电子设备的锁相,该文展示提取基波电流的方法,也将说明有效地检出谐波的数字方法。In recent years some local power systems went to unstable, performed as voltage and frequency swing, extended to trip, local system outage. This paper confirms that some of them caused by harmonic instability phenomenon, the reason is high power electronic equipment produce large amount of harmonics, and then system voltage heavily distorted result in phase locking failure of some power electronic equipment. The basic principle of a robust phase locking method of a power electronic equipment must treat fundamental frequency waveform and positive components of the reference voltage only. For the sample voltage with unbalance and harmonics, this paper uses slide Fourier and slide symmetrical component method, these methods can get the fundamental positive component voltage with minimal computing procedure. According to the need of series connected devices, this paper introduces the current extraction methods and the effective harmonic detection methods.

关 键 词：谐波不稳定 锁相 傅里叶法 对称分量法 基波 

分 类 号：TM71[电气工程—电力系统及自动化]