基于虚拟磁链的 STATCOM 直接功率控制研究

摘要

The H-bridge cascaded connection based static synchronous compensators ( STATCOM) has been mainly studied in this paper.The principle of virtual flux observer and the direct power control algorithm based on the virtual flux linkage has been analyzed.The integration element in flux observer has been improved and the cascaded inertial element has been adopted instead to eliminate the steady state error.The DC side voltage imbalance factors are ana-lyzed in the view of power conservation, and a distributed DC voltage control algorithm has been introduced.The sim-ulation results show that the direct power control method based on virtual flux linkage has been dynamic property, and the control algorithm in DC side is correct.Finally, the control strategy is verified in a three level chain STATCOM system with VME control box as its core controller, and the experimental results verify the effectiveness and feasibility of the algorithm.%对基于H桥级联的静止同步补偿器（ STATCOM）进行了研究，分析了虚拟磁链观测器的原理和基于虚拟磁链的直接功率控制算法，对虚拟磁链观测器中的纯积分环节进行了改进，应用级联惯性环节代替纯积分环节来消除纯积分环节带来的稳态误差，从功率守恒的角度分析了直流侧电压不平衡的因素，引入了分布式直流侧电压控制算法。在MATLAB仿真软件中对功率解耦控制算法与基于虚拟磁链的直接功率控制算法进行了仿真分析，结果表明基于虚拟磁链的直接功率控制算法有更好的动态性能，且验证了直流侧控制算法的正确性。最后，在一台以VME控制箱为核心控制器的3级链式STATCOM系统上对控制策略进行了验证，实验结果表明了算法的有效性、可行性。