混合微网中双向AC/DC变换器研究与设计

Research and Design of Bidirectional AC/DC Converter in Hybrid Microgrid

在交直流混合电网中,AC/DC变换器既要实现直流微网与上级交流电网的连接,也要成为风力发电、燃气轮机发电等交流型分布式能源的并网接口。基于此,首先建立交直流混合微网中AC/DC变换器模型;其次采用PID闭环控制,实现配电系统的稳定,并在系统中增设可控出力的蓄电池双向功率变换环节,实现功率平衡;最后采用SVPWM进行逆变控制策略,降低谐波畸变率,进一步保证系统稳定性。

In AC/DC hybrid power grid,AC/DC converter can be used as the interface between DC distribution network and superior AC power network,and also as the grid-connected interface of AC distributed energy such as wind power generation and gas turbine power generation.Based on this,firstly,the AC/DC converter model in the flyover DC hybrid microgrid is built.PID closed-loop control is adopted to realize the stability of the distribution system.The bidirectional power transformation link of the battery with controllable output is added to achieve the power balance.The inverter control strategy of SVPWM is used to further reduce the harmonic distortion rate and ensure the stability of the system.