复杂大电网无功潮流的参数误差高敏性分析

由于超高压输电线路受所处地理环境、气候条件以及负荷水平等的影响,潮流建模时输电线路参数与真实值之间不可避免会存在误差。从线路的分布参数特性分析了线路参数的误差来源,针对电流流过输电线路时的电压降落和功率损耗,分析线路参数电阻、电抗、电纳的误差对两者的影响,进而扩大到对复杂大电网无功潮流和节点电压的影响。最后,以南方某省500 k V超高压电网为算例,进行潮流计算仿真分析。仿真结果表明了复杂大电网无功潮流对输电线路参数误差具有高敏性,结论对电网优化运行与控制具有重要的指导价值。

Analysis of Parameter Error Hypersensitivity of Reactive Power Flow in the Complex Large-Scale Power Grid

Due to the influence of the geographical environment, climatic condition and the severity of the load on ultrahigh voltage transmission lines, error transmission lines parameter and true value is inevitable when flow modeling. We can tell the origin where the error of transmission parameters lies from the characteristics of its distribution. In view of voltage drop and power loss produced by the current flowing through the transmission line, this paper analyzes the influence which the error of line parameter, the resistance, reactance and susceptance has on both voltage drop and power loss, extending to the influence on complex large grid reactive power flow and node voltage. Finally, taking 500kV UHV power grid of a province in the southern as an example, this paper uses simulation software to flow calculate and simulation analyze. The results of simulation show that the error of complex large grid reactive power flow on the transmission line is hypersensitivity, conclusion has important guiding valve to power grid optimal operation and control.