考虑交流潮流校正的日内滚动发电计划模型与方法

AC-corrected Model and Method for Intra-day Generation Scheduling

为了提高日内滚动发电计划的计算效率和潮流计算精度,采用直流潮流建立日内滚动发电计划优化模型,考虑基态和N-1故障方式下的网络安全约束,从而高效求解滚动发电计划;基于机组有功出力计划,结合无功负荷预测和无功补偿设备投切情况,建立以有功出力调整量最小为目标的交流潮流校正模型,对有功出力计划进行修正,从而提高计划潮流的准确性,满足实时运行的精度要求。基于实际电网的算例分析表明,该方法能够有效提高优化计算效率和潮流准确度。

In order to improve computational efficiency and power flow accuracy, an AC-corrected model and method for intra-day generation scheduling is proposed. The intra-day generation scheduling optimization model based on DC flow is established first, then the optimization generation plan is created with consideration of network security constraints under normal and N-1 contingency scenarios. An AC-corrected model is built with objective of minimizing overall generation power output adjustment based on obtained generation active power schedule and reactive load forecast or historical distribution. This model corrects generation power outputs and therefore improves accuracy of network power flow to meet real-time operation requirements. The case study of a real power system show that proposed model and method can effectively improve computational efficiency and power flow accuracy as expected.