适合分布式光伏发电接入的交直流混合低压配电系统的研究

Research on AC and DC Low-voltage Distribution Systems Suitable for PV Access

针对传统的交直流混合微网中的能耗大,孤岛检测可能失败等问题。本文提出一种适合分布式光伏发电接入的交直流低压混合配电网,直流电直接给直流家用电器供电,交流电网给交流电器直接供电,这样既能减少能量转换过程中电能的损耗又有良好的经济性。交直流电网之间的连接采用24脉波晶闸管双向换流器,既可以降低损耗,又可以防止孤岛检测失败。光伏最大功率跟踪采用电导增量法,换流器的控制采用恒压控制以维持母线电压稳定,仿真结果证明方案的可行性。

To solve the problems of power loss and the failure of the isolated island detection in the traditional AC / DC hybrid microgrid. A low-voltage AC and DC hybrid distribution network was presented, which is suitable for a distributed PV to access, DC power supply DC power directly to DC household electrical appliances, as AC power supply AC power directly to AC household electrical appliances, so that both can save power and have a good economy. A 24-pulse thyristor converter between AC and DC hybrid distribution network was used, which can reduce the loss of the power, and can prevent the failure of the island test. The algorithm of MPPT used P＆O. Method; the Inverter control used constant pressure control to maintain the bus voltage stability. The simu- lation results prove the feasibility of the scheme.