光储直流微电网自适应下垂控制策略研究

Adaptive Droop Control Strategy for Photovoltaic and Energy Storage Direct Current Microgrid

分析传统下垂控制母线电压偏移较大的原因,提出一种新型自适应下垂控制策略。建立变换器下垂系数与负载功率之间的数学模型,自主调整下垂系数使直流母线电压稳定在额定值。构建直流微电网仿真模型和实验台架,在相同工况下对传统下垂控制策略和所提控制策略进行对比,仿真和实验结果表明此方法可保持母线电压基本恒定,抑制变换器间环流,并可根据光伏单元自身容量按比例分配负载功率。

A novel adaptive droop control strategy is proposed by analyzing the reason of bus voltage deviation in traditional droop control.A mathematical model between droop coefficient and load power is established to adjust the droop coefficient autonomously and stabilize the direct current bus voltage at rated value.The simulation model and experimental platform of direct current microgrid are constructed, and the traditional droop control strategy and the proposed control strategy are compared under the same working conditions.The simulation and experimental results show that this method can keep the bus voltage basically constant, restrain the circulation between the converters, and distribute the load according to the capacity of the photovoltaic unit.