含新型统一潮流控制器的电力系统安全校正模型

Security Correction Model of Power System with Novel Unified Power Flow Controller

统一潮流控制器(UPFC)串联侧和并联侧接于不同母线的新型拓扑使得UPFC的传统稳态模型难以适用,灵敏度类安全校正方法忽略了无功功率的影响,可能会引入新的不安全因素。基于此,提出一种适应性更强的UPFC稳态模型,并提出一种含UPFC的潮流计算优化模型。在考虑无功功率的影响后,引入0-1变量将安全校正问题转化为以调整设备数目最少和调整量最少为目标的多目标优化问题。然后,通过权重区分发电机节点和负荷节点,减少切负荷动作的发生。最后,利用极大值法将多目标优化问题转化为单目标优化问题,降低模型求解难度。116节点实际等值系统的算例测试表明,所述安全校正模型可利用最少的调整设备和调整量,消除系统过载故障。UPFC参与调控可提高系统安全校正效率。

New topology of unified power flow controller(UPFC)connected to different buses on shunt side and series side makes the traditional steady-state model of UPFC difficult to apply.Sensitivity-based security correction method ignores the effect of reactive power and may introduce new insecurity factors.Based on this,a steady-state UPFC model with high adaptability is proposed,along with an optimization model for power flow calculation with UPFC.Then,considering the influence of reactive power,a variable of 0-1 is introduced to transform the security correction problem into a multi-objective optimization problem with the objective of minimizing the number of adjusting devices and the amount of adjusting.Furthermore,the generator nodes and load nodes are distinguished by weights to reduce the occurrence of load shedding.Finally,the multi-objective optimization problem is transformed into a single-objective optimization problem by using the maximum method,which decreases the solving difficulty of the model.The test results of 116-bus equivalent system show that the proposed security correction model can eliminate the overload fault of the system by using the least adjusting equipment and adjusting amount,and the UPFC can improve the efficiency of the security correction.