高比例分布式电源接入电网短路电流的拟牛顿迭代计算方法  

Quasi-Newton Iterative Calculation Method for Short Circuit Current of High Proportion Distributed Generation Connected to Power Grid

作　　者：吴成国 肖仕武 WU Chengguo;XIAO Shiwu(State Key Laboratory of Alternate Electrical Power System With Renewable Energy Sources(North China Electric Power University),Changping District,Beijing 102206,China)

机构地区：[1]新能源电力系统国家重点实验室(华北电力大学),北京市昌平区102206

出　　处：《电网技术》2022年第12期4581-4590,共10页Power System Technology

基　　金：国家电网公司科技项目(4000-202118066A-0-0-00)。

摘　　要：分布式电源的接入导致电网的短路电流计算网络方程非线性,不可避免会运用数值迭代方法进行计算,目前绝大多数文章采用的算法都是不动点迭代方法,该文研究发现随着分布式电源渗透率的增大,这种不动点迭代方法收敛特性将变差,高比例分布式电源接入电网短路电流计算面临挑战。针对现有短路电流计算方法在处理高比例分布式电源电网时的不足,文中提出了一种计及电网电压约束条件的分布式电源接入电网的新型迭代计算方法。首先分析了目前的不动点迭代计算方法在高比例分布式电源接入电网中收敛特性的理论依据。其次,提出了收敛特性更好的拟牛顿迭代计算方法,分析了其基本原理并给出在电网短路计算中的具体应用方法,接着提出了适应于高比例分布式电源接入电网的计及电压约束条件下的拟牛顿迭代算法,能够保证分布式电源接入节点电压不越限,同时具有良好的收敛特性。最后以IEEE33节点与IEEE118节点电网为例,通过与目前常规的不动点迭代计算方法进行对比分析,验证了该文所提的拟牛顿迭代计算方法具有更好的迭代收敛特性。With the increase of the permeability of distributed generations,the short-circuit current calculation of power grid needs to take into account the influence of distributed generations.The access of distributed generations leads to the nonlinearity of network equation,so it is inevitable to apply the numerical iterative calculation method.At present,most of the algorithms involved in this paper use the fixed point iterative calculation method.In this paper,it is found that with increase of the permeability of distributed generations,the convergence characteristics of this simple iterative method will become worse,and the calculation of short-circuit current in high proportion distributed generation networks is facing serious challenges.In view of the shortcomings of the existing short-circuit current calculation methods in dealing with high proportion distributed generations power grid,a new iterative calculation method of power grid considering node voltage constraints is proposed in this paper.Firstly,the theoretical basis of the convergence characteristics of current iterative calculation methods in high proportion distributed power grid is analyzed.Secondly,the Quasi-Newton iterative calculation method with better convergence characteristics is proposed,and its basic principle and specific application method in power grid short-circuit calculation are introduced.Then,the modification method of distributed generation short-circuit calculation model considering voltage constraints is introduced.Finally,based on IEEE33 bus and IEEE118 bus power grids,through the comparative analysis with the current conventional fixed point iterative calculation method,it is verified that the Quasi-Newton iterative calculation method proposed in this paper has better iterative convergence characteristics than the conventional fixed point iterative calculation method.

关 键 词：高比例分布式电源 不动点迭代 短路电流计算 拟牛顿迭代算法 收敛特性 

分 类 号：TM721[电气工程—电力系统及自动化]