D-STATCOM不平衡负荷补偿电流的优化设计  

Optional Design of Compensation Currents for D-STATCOM Used for Unbalanced Load

作　　者：朱永强[1] 刘文华[1] 宋强[1] 谢文[1] 刘世宇[1] 

机构地区：[1]清华大学电机系,北京市100084

出　　处：《电力系统自动化》2005年第8期65-70,共6页Automation of Electric Power Systems

基　　金：台达电力电子科教发展基金资助项目。

摘　　要：在介绍不平衡负荷的电纳补偿原理的同时,分析了其不足之处,即在负荷严重不平衡的情况 下,三相补偿装置分担的负荷不均衡,限制了装置的补偿能力,也容易导致一相或两相过流;针对不 平衡负荷补偿的特殊工况,提出了补偿电流优化设计的目标,即三相电流大小均衡。文中给出了补 偿电流优化设计的理论依据和前提条件:首先,通过选择合适的电路连接方式,电流是多样可选择 的;从数学上证明了提出的优化设计目标的合理性,并给出了优化补偿电流的计算方法。通过 MATLAB计算,与传统补偿思路进行了基波电流、电容电压波动等多项指标的比较,证明优化设 计原理在各项指标上部具有明显的优势。PSCAD仿真和10 kVA样机实验结果表明,优化设计原 理可以实现且效果良好。The shortage of compensation principle for unbalanced loads with admittances is analyzed, which occurs in the serious unbalanced working condition and makes the three-phase compensation currents different in amplitude from each other which may lead to one or two phases overload and the compensation capability is restricted. Optional design target is proposed, which is to make the three-phase compensation currents close to each other as possible as it can in order to bear the loads in nearly average. Theoretical basis and preconditions are discussed that any currents combination can be realized by proper circuit selection, then mathematical proof and calculating method of the optional design target is introduced. Comparisons of the optional design and conventional compensation principle are made with MATLAB simulation, which demonstrate the advantages of the optional design in the aspects of maximum phase compensation current and DC voltage ripple. PSCAD simulation and 10 kVA D-STATCOM field test results show that the optional design can be realized with good effect.

关 键 词：D-STATCOM 不平衡负荷补偿 优化设计 

分 类 号：TM714[电气工程—电力系统及自动化]