直流电网中潮流控制器电路拓扑比较

构建直流电网能有效解决大规模新能源电力的可靠接入,弥补现有交流电网的不足。如何有效控制直流电网内线路潮流是构建直流电网时不可回避的问题。随着直流电网中节点数的增加和网络结构的复杂化,仅靠换流站控制将无法实现整个直流电网潮流的优化分配及有效控制。在直流电网中引入潮流控制器可有效达到控制潮流的目的。文中对现有直流潮流控制器电路拓扑进行了详细比较分析,指出了各类直流潮流控制器的优缺点及应用场合,在此基础上,提出一种新型线间直流潮流控制器。随后分别从4类直流潮流控制器中选出一种,在一个五端直流电网仿真模型中分别进行仿真研究,验证了各类直流潮流控制器的特性。最后,指出了直流潮流控制器技术未来的研究方向和需要解决的问题。

Comparisons of Power Flow Controller Topologies in DC Power Grids

Constructing DC power grid can effectively solve the problem of reliable integration of large-scale new energy into the system, making up for the defects of the existing AC power grid. When constructing the DC power grid, an inevitable problem is how to effectively control the power flow in the DC power grid. When nodes are increased and the structure of DC power grid becomes more complicated, the power flow of DC power grid cannot be effectively distributed and controlled just by relying on the control by the converter station. Inserting power flow controllers into the DC power grid can effectively control the power flow. The topologies of existing DC power flow controllers are analysed first and the advantages and disadvantages and application occasions of these DC power flow controllers are pointed out. Then a novel inter-line DC power flow controller is developed and one of four different kinds of DC power flow controllers is chosen for simulation in a five-terminal DC power grid to verify the characteristics of all DC power flow controllers. Finally, the research direction and problems to be solved of DC power flow controller technologies are presented. This work is National Natural Science Foundation of China(No. 51307024), State Grid Corporation of China(No. NY83-15-003), and Graduate Research and Innovation Project of Jiangsu Province(No. SJLX_0063MMM).