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直流侧电压平衡是单相链式STATCOM能够安全、可靠运行的前提,而各H桥之间有功功率损耗的差异是造成直流侧电压不平衡的根本原因。建立了单相链式STATCOM在d-q旋转坐标系下的数学模型,基于瞬时功率理论分析了引起直流电压不平衡的原因,并设计了由前馈解耦电流内环、电压均值外环和电压平衡外环组成的三环控制策略。与在a-b-c静止坐标系下的控制策略相比,该方法不仅实现了网侧电流的无静差控制,同时更便于直流侧电压平衡环节的实现。仿真与实验均验证了该方法的有效性。
DC voltage balance is the premise of single-phase chain STATCOM can be safe and reliable operation, and the difference between active H W bridge power loss is the root cause of DC voltage imbalance. The mathematical model of single-phase STATCOM under the dq rotating coordinate system is established. Based on the instantaneous power theory, the cause of unbalanced DC voltage is analyzed. The design of the three-phase STATCOM based on the inner loop of feedforward decoupling current, Outer ring composition of the tricyclic control strategy. Compared with the control strategy in the a-b-c stationary coordinate system, this method not only achieves no-dead-time control of the grid-side current, but also facilitates the implementation of the DC-link voltage balancing. Simulation and experiment verify the effectiveness of this method.