关键词: 高渗透率光伏, 电压控制, 鲁棒控制, 有功-无功协同, 统一控制模型

Abstract: With the large-scale integration of distributed photovoltaic systems into distribution grids, voltage fluctuations and out-of-limit issues have become increasingly prominent. Traditional single-voltage control methods struggle to achieve rapid dynamic voltage regulation. Therefore, for distribution grids with high penetration of distributed PV, this paper proposes a robust control strategy based on the coordinated operation of distributed power source converters and static var compensators. First, voltage control models for distributed power sources and static var compensators are established. Second, based on these control models, a voltage sensitivity matrix is introduced to construct a unified voltage control model for the distribution network. By coordinating active and reactive voltage control, the system's active voltage regulation capability is fully utilized to achieve rapid dynamic voltage control. Considering the parameter uncertainties arising during distribution network operation, a robust control strategy is designed incorporating robust H∞ performance constraints. Finally, case studies conducted on the IEEE 33-node system under scenarios of fluctuating PV output and sudden load changes demonstrate that the proposed strategy achieves fast and stable voltage control. It effectively suppresses voltage fluctuations caused by external disturbances, verifying the rapidity and effectiveness of the proposed cooperative control strategy.

Key words: high penetration photovoltaic, voltage control, robust control, active-reactive synergy, unified control model