基于单载波调制的链式STATCOM电容电压均衡控制方法研究

为解决链式STATCOM电容电压均衡问题,探讨了一种单载波调制电压均衡方法。针对单载波调制的链式STATCOM,采用电压解耦控制实现其总体有功功率控制,在均压控制方面,采用能量交换法和循环换位法相结合的均衡控制策略,在实现电压动态平衡的同时提高了稳态平衡精度。为使工作模式可靠切换,提出了一种切换控制方法。最后,仿真实验结果验证了该控制方法的有效性和可行性。

Research on Capacitor Voltage Balance Control Method for Cascade STATCOM Based on Single-carrier Modulation

In order to solve the capacitor voltage balance problem of cascade STATCOM , a voltage balancing control method based on single-carrier modulation is probed in this paper ..Aiming at the single-carrier modulation cascade STATCOM, the voltage decoupling control method is adopted to realize the control of overall active power .In terms of the voltage balancing control , a voltage balancing control strategy which combines the energy exchange method with circulation transposition method is proposed to realize the voltage dynamic balance process and improve the steady state balance precision at the same time .A switch control method is proposed to realize reliable switching of working mode.Finally, the effectiveness and feasibility of the proposed control method are verified by the simulation results .