基于短路电流约束的新能源最大接入容量实用化计算方法

Practical Calculation Method for Maximum Capacity of New Energy Access Based on Short-circuit Current Constraint

摘要:

随着并网新能源规模的迅猛增加，对短路电流的贡献愈发凸显。针对新能源最大装机容量难以估计的问题，提出了一种基于短路电流约束的新能源最大接入容量实用化计算方法。通过计算新能源固定装机容量接入高电压等级汇集站对短路电流的贡献值，并根据现有系统中高电压等级汇集站的短路电流与断路器遮断容量的差值，在保障断路器遮断能力的前提下，折算出新能源最大接入容量。所提方法可有效评估新能源接入电网时对电网短路电流的贡献问题，并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，所提方法具有良好的指导意义和实际应用价值。

Abstract:

With the rapid increase in the scale of grid-connected new energy, the contribution to short-circuit current is becoming increasingly prominent. Aiming at the difficulty in estimating the maximum installed capacity of new energy, a practical calculation method for the maximum capacity of new energy access to power grid based on short-circuit current constraints is proposed. Through calculating the contribution value to short-circuit current by the fixed installed capacity of new energy access to high voltage level collection stations, and according to the difference between the short-circuit current of high voltage level collection stations and the breaking capacity of circuit breaker in the existing system, the maximum capacity of new energy access to power grid is calculated under the premise of ensuring the breaking capacity of circuit-breaker. The proposed method can effectively evaluate the contribution of short-circuit current when new energy access to power grid, and can easily and quickly determine the maximum installed capacity of new energy that can be connected to the centralized grid-connecting point. Actual grid calculation examples show that the proposed method has good guiding significance and practical application value.