模式转换下分布式电源接入微电网的控制策略研究及仿真

分布式电源的建模及微电网的控制策略是当前的研究热点,针对模式转换下分布式电源接入微电网控制策略选择的研究较少。孤岛和并网模式下应选择不同的控制策略,同时在一个微电网中加入多种分布式电源的控制复杂,难度比单一分布式电源接入要大。文章分析了微电网的特殊性,进行了不同的控制模式的比较。孤网时选择主从控制模式作为微电网的控制策略可以适应微电网不同运行方式的需要;并网时分布式电源可采用PQ控制。根据在并网模式下的运行特点提出各个分布式电源的PQ控制策略,建立了含光伏电池、风力发电机、微型燃气轮机的微电网模型。仿真分析了孤岛运行下和日照环境改变时微电网的并网运行特性,结果证明了控制方式的恰当选择能使微电网在不同运行模式下对于大电网可控且动态性能优良,并网时不会对大电网产生大的冲击。

Study and Simulation on Distributed Power Access to Power System under Mode Switching

A number of researches have focused on the modeling of distributed power and control strategy of Microgrid, but there are fewer studies for mode conversion distributed Micro grid access choice of control policy. Meanwhile, the control of the Microgird with multiple distributed generations is more difficult than that of the Microgrid with just on distributed power. This paper analyzes the particularity of Microgrid, compares different control modes, and finally selects the master-slave control mode as the control strategy of Microgrid. PQ control strategies of various distributed generations has been built according to working characteristics of accessing model, and the simulation model of a Microgrid containing photovoltaic cells, wind turbines and microturbines has been built. The working characteristics of paralleling Microgrid with light intensity changes has been simulated, and the results shows that the proper choice of control method can guarantee the controllability of Microgrid as to power system and excellent dynamic performance, thus it has slight impact on the power system.