考虑风电随机性的交直流系统协调二级电压控制方法

Coordinated secondary voltage control method of AC/DC system considering wind power randomness

为了应对风电随机波动导致的送端电网潮流大规模变化、换流母线电压扰动,进一步导致换流站离散设备额外动作,提出考虑风电随机性的交直流系统协调二级电压控制方法:首先通过定义功率相对偏差来描述风电波动程度,筛选出二级电压控制中不能忽略风电功率波动的特征时段;然后采用k-means聚类方法得到特征时段风电出力的典型场景;最后利用概率场景法来表示风电的随机性,借助机会约束法解决不确定性优化问题。基于修改的IEEE39节点算例系统进行仿真并验证所提方法的有效性。

To address the challenges posed by large-scale changes of the sending grid tide and the voltage disturbance in converter buses caused by random fluctuation of wind power,which further leads to additional actions of the discrete equipment in the converter station,this paper proposes a coordinated secondary voltage control method for AC-DC systems that consider the randomness of wind power.Firstly,the degree of wind power fluctuation is quantified by defining the relative deviation of power,and characteristic time periods of wind power fluctuation which cannot be ignored in the secondary voltage control are identified.Next,the k-means clustering method is employed to obtain typical scenarios of wind power output during these characteristic time periods.Finally,the probabilistic scenario method is used to represent the randomness of wind power,and the uncertainty optimization problem is solved using the chance constraint method.The effectiveness of the proposed method is validated through simulations conducted on a modified IEEE39 node arithmetic system.