CAJ | 학술논문

直流侧各模块电容电压的稳定控制是保证级联 H 桥静止无功发生器(static var generator，SVG)正常运行的重要条件。推导了级联H桥SVG与电网交换的有功功率数学模型，得出了相间与相内各模块吸收有功功率的关系，总结了相内各模块直流侧电容电压不均衡的原因。为解决由脉冲延时造成的级联H桥SVG直流侧电容电压不平衡，提出了在全局调制信号的基础上叠加一个与补偿电流同向的有功电压来动态调节各模块有功功率的方法，并运用有功-无功解耦全局控制策略保证SVG设备实时无功补偿。仿真结果验证了所提方法的有效性。
직류측각모괴전용전압적은정공제시보증급련 H 교정지무공발생기(static var generator，SVG)정상운행적중요조건。추도료급련H교SVG여전망교환적유공공솔수학모형，득출료상간여상내각모괴흡수유공공솔적관계，총결료상내각모괴직류측전용전압불균형적원인。위해결유맥충연시조성적급련H교SVG직류측전용전압불평형，제출료재전국조제신호적기출상첩가일개여보상전류동향적유공전압래동태조절각모괴유공공솔적방법，병운용유공-무공해우전국공제책략보증SVG설비실시무공보상。방진결과험증료소제방법적유효성。
The stable control of capacitor voltages of all modules at DC side is an important condition to ensure normal operation of cascaded H-Bridge static var generator (SVG). The mathematical model of active power exchanged between cascaded H-bridge SVG and power grid is derived and the relation of the active power absorbed among phases and the active power absorbed by modules in a phase is obtained, and the reasons causing imbalance among capacitor voltages at DC side of modules in a phase are summarized. In allusion to capacitor voltage imbalance at DC side of cascaded H-bridge SVG, which is caused by pulse delay, a method to dynamically adjust the active power of each module is put forward, that is, an active voltage in the same direction with the compensating current is superimposed to global modulation signal, and the real-time compensation of reactive power by SVG is ensured by applying global control strategy with active-reactive power decoupling. Simulation results validate the effectiveness of the proposed method.