CAJ | 학술논문

链式静止无功补偿装置( SVG)对于提高电网的安全稳定有着巨大的意义，其中便于模块化的链式结构给扩展SVG容量带来了很大的方便，但是结构中分散的直流侧电压却难以控制。根据双闭环控制理论，使内环电流控制实现了无功电流的实时准确跟随；外环直流电压控制不仅分相控制了单相的总体电压水平，而且根据各路的调制波信号控制了单个功率单元电压水平，从而实现了外环的分层控制策略。在Matlab/Simulink下，以2 kV电压等级为例，对每相三功率单元串联的三相系统进行了仿真，通过仿真实验验证了SVG的补偿效果以及控制系统的可靠性。
련식정지무공보상장치( SVG)대우제고전망적안전은정유착거대적의의，기중편우모괴화적련식결구급확전SVG용량대래료흔대적방편，단시결구중분산적직류측전압각난이공제。근거쌍폐배공제이론，사내배전류공제실현료무공전류적실시준학근수；외배직류전압공제불부분상공제료단상적총체전압수평，이차근거각로적조제파신호공제료단개공솔단원전압수평，종이실현료외배적분층공제책략。재Matlab/Simulink하，이2 kV전압등급위례，대매상삼공솔단원천련적삼상계통진행료방진，통과방진실험험증료SVG적보상효과이급공제계통적가고성。
The chain static reactive compensation device ( SVG) is of great significance for enhancing the security and stability of the power grid. The chain structure that is facilitated to be modulated has brought great convenience to ca-pacity expanding of the SVG. but the scattered DC line-side voltage control is difficult to achieve. Based on the doub-le closed-loop control theory, this study enabled the inner current control to follow the reactive current accurately and in real-time. And the hierarchical control of the outer ring was realized, under which the outer DC voltage control not only controlled the general voltage level of the single phase in individual phase control, , but also controlled the volt-age level of each power unit according to various modulation waves. . Under the environment of Matlab/Simulink, taking the 2kV voltage level for example, the paper simulated the three-phase system with the power unit of single-phase three series, and the simulation results verified the compensation effect of the SVG and the reliability of the con-trol system.