面向用户的多分布式电源并联优化控制技术研究

Research on User-oriented Multi-distributed Power Supply Parallel Optimization Control Technology

采用传统下垂控制的多分布式电源并联系统中,由于线路阻抗和本地负荷不同以及控制单元逻辑复杂、控制参数设置差异等原因,使各分布式电源有功无功功率输出不能按容量均分,导致产生系统环流。对此,提出一种改进的分布式电源并联下垂控制策略,即在传统U-Q下垂控制中加入无功补偿,将有功下垂前置到直流侧DC/DC斩波器环节,最终最大限度减小分布式电源并联变流器有功、无功之间相互耦合影响,有效改善分布式电源多机并联时有功/无功功率分配精度,降低系统环流。最后,通过Matlab/Simulink仿真平台验证了该策略的有效性和可行性。

In the multi-distributed power parallel system with the traditional droop control,due to the difference of line impedance and local load,complicated logic of the control unit,and different control parameter setting,the active and reactive output of each distributed power cannot be divided according to capacity,resulting in generate system circulation.Aiming at this problem,an improved parallel power supply droop control strategy for distributed power supply is proposed.The reactive power compensation is added to the traditional U-Qdroop control,and the active droop is placed forward to the DC side DC/DC chopper,which ultimately reduces the interaction between the active and reactive power of the distributed power supply parallel converter.The active/reactive power distribution accuracy was improved,and the system circulation was reduced.Finally,the effectiveness and feasibility of the strategy were verified by the Matlab/Simulink simulation platform.