光储直流微电网系统协调控制策略研究

Research on coordinated control strategy of photovoltaic and energy storage DC microgrid system

为了更好地控制、管理和使用随机性较大的分布式可再生能源和需求波动较大的负载,文章对光储直流微电网系统内不同的变换器提出不同控制策略,通过不同控制策略控制变换器协调运行来保证系统的稳定运行,同时利用基于超级电容和蓄电池的互补特性设计了级联的拓扑结构组成混合储能系统,使系统稳定性进一步提高;并将系统分为多个运行模式,在所提控制策略下系统在多个模式间实现平滑稳定切换。最后对运行中出现的分布式光伏电源输出波动和负载变化情况在MATLAB/Simulink进行了仿真实验。结果表明,所提策略能有效抑制系统直流母线电压波动和优化混合储能的运行,提高了系统的可靠性和稳定性,验证了控制策略的有效性和可行性。

In order to better control,manage and use random distributed renewable energy and loads with large demand fluctuations,this paper proposes different control strategies for different converters in the DC micro-grid system,and controls the coordinated operation of converters to ensure the stable operation of the system through different control strategies.Meanwhile,a cascaded topology is designed to form a hybrid energy storage system based on the complementary characteristics of super capacitors and batteries,which further improves the stability of the system.The system is divided into multiple operating modes,and the system realizes smooth and stable switching among multiple modes under the proposed control strategy.Finally,a simulation experiment is carried out in MATLAB/Simulink for the output fluctuation and load change of the distributed photovoltaic power supply during operation.The results show that the proposed strategy can effectively suppress the DC bus voltage fluctuation of the system and optimize the operation of hybrid energy storage,which improves the reliability and stability of the system,and verifies the effectiveness and feasibility of the control strategy.