现有的逆变器并联控制策略都是基于平均均流模式,而某些应用场合输入电压源采用发电机形式,其工作效率在额定电流点最优,此时平均均流模式显然不适用.提出了一种新型的并联控制方案,使得除最后一个并联的电压源外其余电压源均工作在额定电流处,整体效率达到最优.该方案中逆变器采用三环控制,电流内环改善系统响应,电压中环确保系统稳定性,外环跟随功率分配单元给定电流信号以获得最优效率.功率分配单元根据负载电流和电压源额定电流提供外环电流给定信号.理论分析和仿真实验验证了该方案的可行性.%Parallel control strategies of inverter are almost based on average current sharing scheme, while it's not suitable for the voltage source like generator whose efficiency is optimal at the point of rated current. A novel parallel control strategy is proposed in this paper that all voltage sources work at the rated current except the last paralleled source, which achieves an optimal overall parallel system efficiency. In the strategy, each inverter has three loops: an inner-loop current controller to improve, the system response, a middle-loop voltage controller to govern system stability and an outer-loop controller to achieve an optimal efficiency following the given current signal of power distribution unit, which provides outer-loop given current signal according to the load current and voltage source rated current. Theoretical analysis and simulation verify the effectiveness of the strategy.
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