一种基于电流分离补偿的级联型DSTATCOM及其建模与控制  

Modeling and Control of Cascaded H-Bridge DSTATCOM Based on Current Separation Compensation

作　　者：许胜[1] 杨振宇[2] 

机构地区：[1]泰州师范高等专科学校,泰州225300 [2]常州供电公司,常州213003

出　　处：《电工技术学报》2012年第9期25-33,共9页Transactions of China Electrotechnical Society

基　　金：泰州市科技专项经费(工业)(TG201218);江苏省科技支撑项目(BE2005072;BE2008123)资助

摘　　要：提出了一种基于电流分离补偿的级联型DSTATCOM,装置各级联功率单元直流侧通过四象限整流器连接到电网,一方面实现各单元直流电压的均衡控制,另一方面采用电流分离补偿的控制方法,将部分或全部基波正序无功电流由四象限整流器提供,而H桥逆变器只承担基波负序、谐波或部分基波正序无功补偿任务,以实现对装置补偿容量的优化配置,提高装置的性价比。文章首先阐述了该装置的工作原理;其次详细分析了装置补偿无功、负序以及谐波电流时功率单元交直流能量的流动情况,并建立了直流侧电流数学模型,以便指导控制算法和电路参数的研究设计;然后,简要介绍了该装置控制系统的设计方案,重点分析了各单元整流器无功补偿同步控制等几个关键性控制技术;最后通过实验对各种理论结果进行了分析和验证。A sort of cascaded H-bridge distribution static synchronous compensator（DSTATCOM） based on current separation compensation is proposed in this paper. A three-phase 4-quadrant VSR united with the DC-side capacitor serves as the independent DC power supply for the H-bridge inverter in the power units of the DSTATCOM. Especially, the VSR provides the whole or a part of the fundamental wave positive-sequence reactive current, and contrarily, the H-bridge inverter only undertakes a part of the reactive compensation tasks besides the fundamental wave negative-sequence and harmonic currents. Thus, the compensation capacity of the DSTATCOM will get optimized distribution and the performance price ratio will also be improved. This paper, firstly introduces the mainly work principle of this device. Secondly, the energy operation rules between the DC and AC side of the power units are analyzed in detail. Moreover, the DC mathematic model is established so as to instruct the researches of the control arithmetic and circuit parameters. Then, this paper sets forth briefly the control system, and on this basis, several critical control methods are analyzed, such as reactive compensation synchronization control technology of every power units. At last, a great deal experiments are made to validate these conclusions mentioned in this paper.

关 键 词：级联型配电静止同步补偿器 电流分离补偿 直流侧数学模型 同步控制 

分 类 号：TM46[电气工程—电器]