直流电网模型和仿真的发展与挑战

直流电网具有接入灵活、控制灵活、经济性好等优势,受到了工程和学术界的关注,而传统的电力系统建模仿真技术已经不能完全适应直流电网的研究和应用的需要。文中介绍了直流电网建模仿真的最新发展,总结了适用于直流电网的设备模型和仿真方法,提出了建模和仿真技术的挑战。在建模技术方面,总结了AC/DC换流器模型、DC/DC换流器模型、直流开关模型、直流负载模型和直流电网的系统控制模型和实现方法。在仿真技术方面,阐述了直流电网潮流算法的实施方案和挑战;总结了直流电网电磁暂态算法在精确性和效率上的挑战,提出了解决方案;阐述了高效的并行算法和多速率混合仿真的挑战和实现方法;展望了物理仿真技术和数模混合仿真在直流电网的应用和未来发展。

Development and Challenge of Modeling and Simulation of DC Grid

Marked with flexible interconnection, flexible control and economy, the direct current (DC) grid has captured the attention of industry and academy while the traditional modeling and simulation technology is hardly able to completely satisfy the needs of DC grids. This paper studies the development of DC grids modeling and simulation, summaries the modeling and simulation technology of DC grids, and proposes challenges to enhance modeling and simulation. In the field of modeling, AC/DC converter model, DC/DC converter model, DC switch model, DC load model, and system control model and implementing method of DC power grid is suggested. In the field of simulation, the power flow on the application and challenge is illustrated, while the drawback of inadequate precision and efficiency of the electro-magnetic simulation algorithm is summarized. Moreover, the real-time simulation, the highly efficient parallel technology and multi rate technology are treated. The trend of analog and digital hybrid simulation is discussed, and its prospects for future application in DC grids are given.