面向快速负荷的SVC控制策略的研究及其应用

Design of the SVC Control Strategy for Fast Load and its Application

根据快速负荷的补偿要求,提出了一种基于瞬时值的负荷补偿原理。利用瞬时无功理论实现了瞬时正序负序无功电流、正序负序有功电流的检测和理想补偿器补偿导纳的计算;同时介绍了一种"全局开环+局部闭环"的SVC控制策略,并对晶闸管阀组的触发方式进行改进,以获得快速响应速度和良好的稳态精度。由试验和现场运行效果证明,本文的SVC控制策略达到了快速负荷补偿的要求,改善了对闪变的抑制效果,对工程实践有较好的指导意义。

For the compensation requirements of fast load,it proposes a principle of load compensation based on the instantaneous value.Using instantaneous reactive power theory,the detections on both reactive current and active current of instantaneous positive/negative sequence are realized,and the calculation of ideal compensator ＇s compensation admittance is also obtained.Furthermore,in order to achieve the rapid response and good steady-state accuracy,a SVC control strategy of overall open-loop part closed-loop is proposed,and the trigger mode of thyristor valves is also improved.The results of test and field running show that the SVC control strategy can meet the requirements of the fast load compensation,improves the flicker suppression and has good guidance for engineering practice.