考虑系统频率响应特征的配电网综合优化规划

Comprehensive Optimization Planning of Distribution Network by Considering System Frequency Response Characteristics

以风电为代表的新能源大规模并入电力系统,其输入给电网能力的不可预测性给电力系统的有功功率平衡以及频率控制带来了严重影响。基于此,提出一种考虑系统频率响应的鲁棒区间风电并网优化调度模型。该模型以发电成本以及风电场弃负荷惩罚成本建立目标函数,通过计算鲁棒区间并制定最佳的发电方案,能够有效降低系统的成本以及系统频率控制。同时该模型考虑了风电并网的特殊恶劣场景下的频率约束,系统的频率变化均满足要求。采用改进IEEE 33节点算例进行验证。结果表明,所提的模型能够保证系统在大规模风电并网过程中系统频率波动的安全性与可控性。

New energy, represented by wind power, is incorporated into the power system on a large scale, and its unpredictability has a serious impact on the active power balance and frequency control of the power system. Therefore, a robust inter-regional wind power grid-connected optimal dispatch model that considers the frequency response of the system is proposed. The model establishes an objective function based on the cost of power generation and the penalty cost of wind farm abandonment. By calculating the robust interval and formulating the best power generation plan, it can effectively reduce the cost of the system and the system frequency control. At the same time, the model considers the frequency constraints in the special harsh scenarios of wind power grid connection, and the frequency changes of the system meet the requirements. An improved IEEE 33-node calculation example is used for verification. The results show that the proposed model can ensure the safety and controllability of system frequency fluctuations in the process of large-scale wind power grid connection.