低压直流微电网母线电压控制策略

Bus voltage control strategy for low voltage DC microgrid

直流母线电压恒定是直流微电网运行控制的目标之一,考虑直流微电网并网和离网两种运行模式,提出基于交流电网和储能电池的直流母线电压控制策略.合理设计AC-DC变换器和DC-DC变换器的电压外环和电流内环控制参数,提高控制系统的动态性能,维持直流母线电压恒定,实现系统功率平衡流动.搭建直流微电网的Simulink模型,验证母线电压控制策略的有效性.结果表明当直流微电网系统内的负载波动时,母线电压控制策略可快速保障直流母线电压恒定,验证了提出的母线电压控制策略的有效性.

One of the aims for microgrid operational control is to maintain the constant of DC bus voltage. Considering DC microgrid on both grid-connected and islanding operating conditions, DC bus voltage control strategy was proposed based on AC power grid and energy storage battery. Through the reasonable design of voltage outer loop and current inner loop control parameters for the both AC-DC converter and the DC-DC converter, the dynamic performance of the control sys- tem was improved, and the DC bus voltage was kept constant. The validity of the bus voltage control strategy was verified by building the Simulink model of the DC microgrid. The results show that the constant of DC bus voltage can be rapidly maintained by the bus voltage control strategy with the load fluctuation of DC microgrid system. Therefore, the bus voltage control strategy is validity.