考虑风电接入的电压控制区域修正方法研究

传统的电压控制区域（VCA）划分会随风电出力的波动而发生变化,为了获得能够适应各种风电出力的稳定分区,提出一种考虑风电接入下电压控制区域的修正方法。首先,为了研究风电出力的波动性对分区的影响,将风电出力概率分布离散化为多个场景,研究每个出力场景下的潮流、分区。其次,利用雅可比子矩阵建立含有功因素的灵敏度矩阵与电气距离矩阵,采用凝聚的层次聚类法对风电出力不同断面条件下的PQ节点分区。通过Q-V曲线的极小值将与PQ节点无功限值一致的发电机组也归为一组,再利用灵敏度法将剩余的PV节点逐次划分获得全网分区。最后,通过识别VCA边界,利用断线分析法将电压波动不一致的边界节点重新划分,从而提升区域之间的电压解耦程度,实现区域的拓扑优化。将IEEE39节点系统处理为多个风电出力场景,并对每个场景的出力断面进行仿真分析。结果表明,所提方法能合理体现由于风电出力波动导致的分区变化,并可修正不同出力场景下的分区变化,可为系统各区域的电压稳定控制提供条件。

RESEARCH ON MODIFICATION METHOD OF VOLTAGE CONTROL AREA CONSIDERING WIND POWER CONNECTION

The traditional Voltage Control Area （VCA） division will change with the fluctuation of wind power output. To obtain a stable partition to adapt the various wind power output, this article proposed a method of voltage control area correction considering the impact of wind power. Firstly, in order to study the impact of the fluctuation of wind power output on the partition, the probability distribution of wind power output is discretized into multiple scenarios, and the power flow and partition of each scenario are studied. Secondly, the Jacobian submatrix is used to establish the sensitivity matrix and electrical distance matrix with power factor, and the condensed hierarchical clustering method is used to partition PQ nodes under different cross-section conditions of wind power output. According to the minimum value of Q-V curve, the generators which are consistent with the reactive power limit of PQ node are also classified into a group, and then the remaining PV nodes are divided into the whole network by sensitivity method. Finally, by identifying the boundary of VCA, the broken line analysis method is used to re divide the boundary nodes with inconsistent voltage fluctuations, so as to improve the voltage decoupling degree identifying the boundary of VCA. In this paper, the IEEE 39 bus system is used for wind power processing in multiple scenarios, and the simulation analysis of each output scenario is carried out. The results show that the proposed method can reasonably reflect the partition changes caused by the fluctuation of wind power output, and correct the partition changes under different output scenarios, which provides conditions for the voltage stability control of each region of the system.