低压配电网三相四桥臂D-STATCOM的无源控制

Passivity-based Control for Three-phase Four-bridge D-STATCOM in Low-voltage Distribution Network

三相四桥臂配电网静止同步补偿器(D-STATCOM)在解决三相四线制的低压供电系统中由三相不平衡负载所带来的问题上有明显的优越性。在同步旋转d-q-0坐标系下建立了系统的欧拉-拉格朗日(EL)周期平均模型,针对其非线性强耦合的特点,采用了无源控制(PBC)叠加反相交叉耦合项的控制策略实现d、q轴分量非线性解耦控制,根据系统的无源性采用了能量成形和阻尼注入(ESDI)的方法设计了PBC控制器,并从Lyapunov稳定性理论上论证了闭环系统的渐进稳定,通过仿真实验验证采用的控制策略实现了三相不平衡等问题的有效处理。

Three-phase four-bridge distribution static synchronous compensator （D-STATCOM） has the obvious superiority in solving the problems that brought by the three-phase unbalanced loads in the three-phase four-wire low-voltage power supply system. The Euler-Lagrange （EL） cycle average model is established based on the synchronous rotation d-q-O coordinates. In the light of the nonlinear and strong coupling characteristics, the passivity-based control （PBC） and inverse cross coupling control strategy using the d-q axis nonlinear decoupling control PBC controller is designed by energy shaping and damping injection （ESD1） based on the passivity of the system. The closed-loop system is demonstrating asymptotically stable according to the Lyapunov stability theory. Simulation results verify to the control strategy deal with three-phase unbalance and other problems effectively.