一种离网主电源逆变器控制策略

A control strategy of inverter for main power in micro-grid

微电网独立运行中的主电源逆变器系统的有效控制是提高分布式发电能源高效利用的有效措施。针对传统控制策略无法有效消除系统运行的稳态误差且控制策略算法复杂问题,在自然坐标系下提出一种基于比例复数积分控制器的电压电流双闭环控制策略,用以改善传统的基于比例积分控制的运行效果。利用比例复数积分控制器可对基波频率交流信号实现零稳态误差追踪,在自然坐标系下进行电压电流双闭环控制,避免进行坐标变换、锁相环与前馈解耦控制环节,达到降低控制系统的复杂程度的目的。最后通过实验证明了所提策略的正确性与有效性。

An effective control strategy of the main power inverter system in micro-grid is a useful measure to improve energy distributed generation. Due to traditional control strategy cannot eliminate the static error of system effectively while leading to complex algorithm,a double closed-loop of voltage and current strategy based on proportional complex integral（ PCI） controller is proposed for the inverter system on natural coordinate. When the PCI controller is used to control fundamental frequency,it offers a zero steady-state error tracking feature. Meanwhile,the coordinate transform,phase locked-loop and decoupling control can be avoided while the calculation of system can be reduced. Finally,the experiment test verifies the correctness of this algorithm.