基于短路电流约束的新能源最大接入容量计算

Calculation for Maximum Capacity of New Energy Access to Power Grid Based on Short Circuit Current Constraints

短路电流超标可能会破坏电网安全稳定运行,甚至导致整个互联系统的崩溃。随着并网新能源规模的迅猛增加,特别是新能源大规模接入对短路电流的贡献越来越大。受限于短路电流水平,集中并网点所能接纳的新能源最大装机容量已成为电网规划和运行部门的重要关注点。分析了新能源对系统短路电流的贡献因素,在对新能源初始接入方案下接入点各电压等级节点进行短路电流计算的基础上,提出了考虑短路电流约束的新能源最大可接入容量判定方法。该方法可简单快速得出集中并网点可接入新能源最大装机规模,实际电网算例计算表明该方法具有良好的指导意义和实际应用价值。

The short circuit current exceeds the standard may damage the secure and stable operation of the power grid,and even lead to the collapse of the entire interconnected system.With the rapid increase in the scale of grid-connected new energy,especially the impact of centralized access new energy on the short circuit current of grid-connected points is growing.Under the limitation of short circuit current,the maximum installed capacity of new energy that can be accessed by centralized grid-connection point has become an important concern of power grid planning and operation departments.The influence factors of new energy on the short circuit current of the grid is analyzed,based on the short circuit current calculation of buses at all voltage levels of the centralized grid access points under the initial grid connection planning scheme of new energy,a method to determine the maximum access capacity of new energy based on the short circuit current constraints is proposed.This method can simply and quickly obtain the maximum installed capacity of new energy that can be accessed by the centralized grid-connection points.The calculation of an actual power grid example shows that this method has good guiding significance and practical application value.