考虑电压稳定的主动配电网动态无功优化

Dynamic Reactive Power Optimization of Active Distribution Network Considering Voltage Stability

高比例分布式电源的接入造成电网局部电压越线问题严重,配电网动态无功优化是配网安全、稳定运行的重要保障。提出了一种考虑电压稳定的主动配电网动态无功/电压调控策略,基于分布式电源运行特性和网络日负荷曲线,建立考虑电压稳定、网络损耗为目标的主动配电网动态无功电压模型,同时考虑电容器组、SVC等无功调压设备动作次数约束;提出了基于柯西变异的动态权重粒子群优化算法,在粒子群进化过程中通过动态调整权重因子、学习因子提高算法的寻优速度,利用柯西变异提高算法跳出局部最优解的能力;最后,通过仿真算例验证本文方法的可行性和合理性。通过合理控制无功调压设备的动作时间实现一天内主动配电网无功潮流的最优分布,提高系统运行的安全性和稳定性。

The dynamic reactive power optimization of active distribution network with stable voltage and the access of high proportion of distributed generation will cause serious local voltage line crossing problem,and the dynamic reactive power optimization of distribution network is an important guarantee for the safe and stable operation of distribution network.A dynamic reactive power/voltage regulation strategy for active distribution network considering voltage stability was proposed.Based on the operation characteristics of distributed generation and the daily load curve of the network,a dynamic reactive power/voltage model for active distribution network considering voltage stability and low network loss was established,taking into account the constraints of the number of actions of capacitor banks,SVC and other reactive power voltage regulation devices;a dynamic weight particle swarm optimization algorithm based on Cauchy mutation was proposed.During the evolution of particle swarm,the optimization speed of the algorithm was improved by dynamically adjusting the weight factor and learning factor,and the ability of the algorithm to jump out of the local optimal solution was improved by Cauchy mutation;finally,the feasibility and rationality of the method are verified by a simulation example.The optimal distribution of reactive power flow in an active distribution network can be achieved by reasonably controlling the action time of the reactive power regulating equipment in a day,and the security and stability of the system operation can be improved.