【摘要】 针对户用直流微电网的低惯性特点,研究分布式电源并网电力电子接口设备的潜在惯性支持能力,提高直流微电网的暂态稳定性.首先,构建基于光储的直流微电网模型,根据微电网直流母线电压变化量及微源接口电路的虚拟惯性控制系数确定能提供的惯性功率;其次,结合配电网的动态潮流约束及直流母线电压变化量的不同,分析加入虚拟惯性控制后直流微电网的暂态稳定性,研究虚拟惯性控制策略及虚拟电容值的选取范围;最后,基于PSCAD平台搭建仿真模型,仿真结果验证了所提虚拟惯性控制策略的有效性,并提高了直流微电网的暂态稳定性.更多还原

【Abstract】 In view of the low inertia characteristics of community DC micro-grid,the virtual inertia control is proposed in this paper through the research potential inertia of distributed power grid power electronic interface equipment support ability to improve the transient stability.Firstly,the model of DC micro-grid based on photovoltaic( PV) and energy storage is established,and the inertial power is directly determined by the DC bus voltage variation and the virtual inertia control coefficient of the interface circuit.Secondly,combined with dynamic trend of constraints of the distribution and variation of different DC bus voltage,the virtual inertial control strategy and the virtual capacitance value are produced while analyzing its transient stability.Finally,a model of community DC micro-grid is built and simulated in PSCAD,and the validity of the proposed control strategy and the correctness of the transient stability analysis are verified.更多还原