摘要
为保证静止同步串联补偿器(SSSC)在输电系统不平衡时仍能输出干净的补偿指令,提出一种主、附加控制器相叠加的控制策略。主控制器采用不涉及正、负序矢量分离的传统双闭环控制策略;附加控制器通过交叉解耦控制来提取双序dq坐标系下的负序电流,并采用P控制来削弱负序电流对主控制器电流内环控制的干扰,消除了直流电压中因正、负序电流的耦合问题而带来的2次谐波。两控制器输出指令相叠加,形成SSSC的输出控制指令。最后在系统电压平衡、不平衡情况下进行仿真,验证了该控制策略的可行性。
To ensure SSSC output a clean compensation command in unbalanced transmission system, this paper proposes a control strategy of combination of a main controller and an additional controller. Main controller uses the traditional double closed loop control strategy, which does not involve vector separation between positive and negative sequence. The additional controller uses the decoupling control to extract the negative sequence current under dual se- quence dq fram, then uses the P control to weaken the interference of negative sequence current on inner-loop current control of the main controller, which eliminates the second-order harmonics in DC voltage due to coupling relationship between positive sequence current and negative sequence current. Adding up the two controllers＂ output command forms the control command of static synchronous series compensator（SSSC）. Finally, the simulation results under balanced and unbalanced system power verify the feasibility of this control strategy.
出处
《电力系统及其自动化学报》
CSCD
北大核心
2015年第7期67-72,共6页
Proceedings of the CSU-EPSA
关键词
三相不平衡
静止同步串联补偿器
矢量分离
正序分量
负序分量
three-phase unbalance
static synchronous series compensator（SSSC）
vector separation
positive sequence component
negative sequence component
