计及电网结构和电源负荷运行态势的电网浓缩方法

A Power Grid Concentration Method Considering the Construction and Its Operation Situations

随着风、光等可再生能源的大规模并入电网,电力系统规模必将日趋庞大,从而给电力系统的安全监视带来困难。为了能够有效地提高电力系统监视的效率,提出了考虑电网结构和电源、负荷运行态势的电网浓缩简化方法。首先,提出电网浓缩度的模型;然后,以发电机输出功率转移分布因子作为浓缩度模型中的输电线路权值、以发电机与负荷电压的灵敏度作为凝聚的寻优目标,建立电网的浓缩模型;最后,建立了浓缩电网经济性检验的评价指标,根据此指标,可以选取最优的浓缩电网。通过对IEEE39节点系统的仿真验证,表明了所提方法的有效性。

With the large-scale wind and photovoltaic power merged in the power grid, the power system is getting larger at an unprecedented rate, lending more difficulties in the safety monitoring. In order to enhance the efficiency of the safety monitoring, this paper presents a concentration method of the power grid considering the power grid construction and its operation trends of power generation and loads. Firstly, the model of concentration is proposed. Secondly, with the shift distribution factor of the generator's output power as the weight of the transmission line, the sensitivity between the power generator and load voltage as the optimization goal of concen-tration, a reduction model of the power grid is established.Finally, the paper sets the assessment criteria for economy of the reduced grid, and the optimal concentration power grid can be chosen according to the criteria. Simulation of IEEE39 nodes has verified the effectiveness of the model.