基于原对偶内点法的发输电系统可靠性评估交流潮流分析法

Composite System Reliability Evaluation with AC Power Flow Analysis Based on Interior Point Method

电力系统可靠性评估对于精度的要求随着新能源接入电网不断提高。传统的发输电系统可靠性评估在状态校正过程中采用基于直流潮流的最小切负荷模型,该模型存在不能考虑系统电压和无功功率的局限。利用原对偶内点法在可靠性评估中实现了基于交流潮流的有功无功综合优化状态校正模型。该模型通过非线性规划综合考虑系统有功无功关联、网损、节点电压及潮流约束等因素。为了解决非线性规划中计算量大和收敛性的问题,还提出了一种改进的基于交流潮流有功无功解耦的状态校正模型。对IEEE-RTS79系统与2012年海南电网进行可靠性评估,结果证明了所提出算法的精确性和有效性。该方法有望应用于更精确地对含新能源发输电系统进行可靠性评估。

With the integration of renewable energy,the requirement of accuracy in the composite system reliability evaluation is underscored. The traditional model for load shedding minimization in the composite system reliability evaluation is based on DC power flow,where reactive power and voltage cannot be considered. This paper presents a newly developed comprehensive optimization load shedding model. Furthermore,in order to reduce the computational complexity brought about by nonlinear programming,a decoupled load shedding model is proposed. Numerical tests are conducted on IEEE-RTS-79,as well as 2012 Hainan Grid and the accuracy and effectiveness of the proposed method have been proved validated. This method is expected to be applied in the reliability evaluation of composite systems with renewable energy.