交直流配电网接纳分布式电源的实时仿真研究

Real-time simulation of AC and DC distribution network to receive distributed generations

含多种分布式电源的交直流混合配电网是未来智能配电网的架构特点。首先,建立了含两个区域的交直流混合配电基本架构,并根据各种分布式电源的容量和发电特性,将光伏电源、直驱风机、双馈风机和储能装置接入配电网的合适区域。然后,详细分析了交直流接口换流器的数学模型及其几种典型控制策略。最后,利用变流器控制方式和运行策略的多样性,对上述交直流混合配电网进行了均衡馈线出力、不间断供电和能量调度实时仿真实验。仿真结果验证了该配电网系统架构在接纳多种分布式电源方面的技术优势。

AC and DC distribution network with multiple distributed generations is an architectural feature of smart distribution grid in the future. Firstly, basic framework of AC and DC distribution network containing two regions is established. Photovoltaic generation system, direct drive turbines, double-fed wind turbine and the energy storage device are connected to the distribution network according to the capacity and characteristics of various distributed generations. Secondly, the mathematical model and several typical control strategies of AC/DC interface converter are analyzed in detail as well. Finally, the real-time simulation experiments of feeder lines balancing, uninterruptable power supply and energy dispatch based on the above AC and DC distribution network are carried out by using the diversity of converter control strategy and operation mode. Simulation results verify the technology advantages of the distribution network system architecture in terms of receiving various distributed generations.