单相H桥级联静止同步补偿器反馈线性化解耦控制

单相H桥级联静止同步补偿器（static synchronous compemator，STATCOM）n7以快速补偿电力机车这种单相整流的波动性负荷所需的无功，但静止同步补偿器是一个强耦合、非线性系统，为对有功和无功进行解耦，引入反馈线性化方法，通过坐标变化和状态反馈，获得精确线性化模型，并使有功、无功完全解耦，设计...

Control Scheme of Decoupled State Feedback Linearization of Single-Phase H-Bridge Cascaded STATCOM

Electric locomotive is a kind of single-phase rectified and fluctuating load,and single-phase H-bridge cascaded static synchronous compensator(STATCOM),which is a strongly coupled nonlinear system,can be applied to electrical railway system to compensate reactive power.To decouple active and reactive power,through leading in feedback linearization method and by means of coordinate transformation and state feedback,active and reactive power are completely decoupled and an precise linearization model is attianed,and a closed-loop controller is developed.To keep capacitance voltage balancing at DC side of H-bridge,the outer voltage loop is combined with individual balancing control to make capacitance voltage keeping its set value.Meanwhile,adopting the strategy of carrier phase-shifted sinusoidal pulse-width modulation(CPS-SPWM),a higher equivalent switching frequency is implememted under lower device switching frequency.Numerical simulation results show that the proposed control strategy is correct and effect;active and reactive power can be independently adjusted and dynamic performance of the system is satisfied,and the set value of capacitor voltage can be maintained.