考虑电能替代负荷的配电网承载力评估方法

随着我国电能替代工作的加速推进,多元电能替代负荷的大量接入对配电网的安全稳定运行带来了极大的考验,评估负荷承载力对配电网规划具有重要意义。首先分析了目前电能替代的主要负荷类型,并建立其运行模型；其次以配电网容纳负荷数量最大为目标函数,考虑源-网-荷-储侧灵活性资源运行约束与配电网安全稳定运行约束,建立了配电网负荷承载力优化模型,通过二阶锥松弛方法将其转化为二阶锥规划模型；最后通过对某实际电网的141节点算例的仿真,实现了对配电网负荷承载力的量

Evaluation method of distribution network hosting capacity considering electric energy substitution load

With the acceleration of the work of electric energy substitution in China, a large number of multiple electric energy substitution loads have been connected, which has brought great challenges to the safe and stable operation of the distribution network. Assessment of load hosting capacity is of great significance to the distribution network planning. Firstly, the main load types of electric energy substitution are analyzed, and their operation models are established. Then, taking the maximum load capacity of the distribution network as the objective function, considering the flexible resource operation constraints of source network load storage side and the safe and stable operation constraints of the distribution network, an optimization model for the load hosting capacity of the distribution network is established, which is transformed into a second- order cone programming model through the second- order cone relaxation method. Finally, through the simulation of a 141 node example of an actual power grid, the quantitative evaluation of the load hosting capacity of the distribution network is realized,and the role of the optimal scheduling and load regulation capacity of flexible resources in improving the load hosting capacity of the distribution network is verified.