计及网损最小的电网简化方法

Power grid reduction method considering the power active loss

针对风电、光伏等可再生能源不断并入电网,以及特高压直流的大力发展,使电网的规模越来越大从而增加了电网无功电压的控制难度的问题,提出了采用蒙特卡洛方法模拟电网实际运行状态,使用非线性最小二乘回归方法获得了有功损耗与节点有功注入、无功注入之间的权重,从而形成了电网有功损耗模型。针对该模型,以电网有功损耗为目标,通过对电网中的各个节点进行了分区优化,从而获得了最符合电网运行实际的节点分区结果。对IEEE39母线系统进行仿真测试。结果表明,所提方法能够实现98%的电压预测精度,说明该电网简化方法有助于提高新形势下电网无功电压的监视和控制精度。

Aiming at the situation of renewable energy, such as wind, photovoltaic and so on, merged into the power grids, and the develop-ment of the extra-high voltage, the power grid scale was becoming much bigger, it was difficult to controll the voltage getting much bigger. In order to solve the problem, the Monte Carlo method was used to simulate the power system real station, and the nonlinear least squares was set to establish relation between the active power loss and active power injection, reactive power injection. The model of power grid active loss could be get. Aiming at the objective, passing through the nodes in grids partition optimization, the result of accord with the real situa-tion was gotten. The simulation test of the IEEE39 buses system was presented. The results indicate that the experimental results verify the forecast accuracy of the proposed method reaches 98%. So the effectiveness of voltage monitoring and controlling is proving and suit to the new power system condition.