考虑短路容量和电压稳定约束的受端电网饱和负荷规模研究

Load Scale Assessment and Power Receiving Capacity of Saturated AC Receiving-End Network Considering Short Circuit Capacity and Voltage Stability Constraint

考虑短路容量和静态电压稳定约束,文章提出了一种交流受端电网饱和负荷规模的量化评估方法。通过网络阻抗建立了短路容量、静态电压稳定极限和热稳定的联系,结合潮流和阻抗分布特性分析得出短路容量和静态电压稳定极限之间存在一定比例。根据实际受端电网环网大小和电网允许的最大短路容量得出输电通道最小阻抗,考虑实际电网环网潮流相对输电通道较低情况,将受端负荷整体结构解耦成单通道对接入点负荷供电模型,得出整个受端地区短路容量和热稳定约束下的静态电压稳定极限解析公式,量化评估了受端电网饱和负荷规模。实际电网仿真验证了其准确性,可为电网分区规划提供一定的参考。

This paper proposes a quantitative assessment method for the saturated load scale of AC receiving-end network with considering the constraints of short circuit capacity and static voltage stability constraint. The relationship of short-circuit capacity,static voltage stability limit and thermal stability is established by network impedance,and the proportional relationship between short-circuit capacity and static voltage stability limit is analyzed qualitatively with the characteristics of power flowand impedance distribution. According to the ring size of the actual receiving-end network and the maximum shortcircuit capacity,the minimum impedance of transmission channel is obtained. Because the power flowof actual ring network is relatively low,the whole receiving-end network can be decoupled into the structure of single power supply to single load,so as to obtain the static voltage stability limit analytical formula under the constraints of the end regions short-circuit capacity and thermal stability,and quantitatively evaluate the saturated load scale of AC receiving-end network. The accuracy is verified by the simulation of the actual network,which can provide some references for the planning of power grid.