考虑最低惯量需求的受端电网储能规划研究

Research on the Energy Storage Planning of the Receiving-End Power Grid Considering Minimum Inertia Requirement

随着新能源接入比例快速攀升,受端电网惯量支撑和频率调节能力逐步下降,频率稳定问题日益突出。电化学储能具有快速功率响应能力,为保障频率稳定提供了新手段。该文综合考虑电化学储能虚拟惯量和快速频率响应功能,提出了一种考虑系统最低惯量需求的受端电网储能规划方法。从最低惯量需求的定义出发,根据惯量水平与系统频率响应特性的关系,得到基于最大频率变化率和最大频率偏差的最低惯量需求约束,以总成本最小为目标和运行安全约束校验为内核构建了储能优化规划模型。基于分段线性化和变量二进制转化技术,实现了原始非线性优化模型的线性化高效求解。基于某电网规划数据开展仿真测试,验证了该文模型的有效性。

With the rapid increase in the proportion of new energy,the inertia support and frequency regulation capability of the receiving-end power grid have been gradually declining,and the problem of frequency stability has become increasingly prominent.Electrochemical energy storage is endowed with fast power response capabilities,providing a new means to ensure frequency stability.Therefore,this paper presents an energy storage planning method for the receiving-end grid that considers the minimum inertia requirement of the system,as well as the virtual inertia and fast frequency response functions of energy storage.Starting from the definition of the minimum inertia requirement,the minimum inertia requirement constraint is derived based on the maximum rate-of-change of frequency and maximum frequency deviation,so as to establish the energy storage planning model with the objective of minimizing the total cost.By utilizing piece wise linearization and binary conversion techniques,the efficient linear solution of the original nonlinear optimization model is achieved.The simulation tests are conducted based on power grid planning data to verify the effectiveness of the proposed model.