AVC Comprehensive Coordinated Control Strategy of Centralized Condenser in Northwest Power Grid

Abstract

This paper presented a comprehensive coordinated control strategy of centralized condenser in high-voltage DC converter station which participated in automatic voltage control (AVC) to perform the reactive power optimization in high proportion new energy areas of Northwest Power Grid. Firstly, the general control idea of AVC was analyzed, and the three-level voltage control mode based on “soft partition” was given. According to the actual situation of Northwest power grid and Qinghai power grid, the coordinated control variables between them were established. Combined with the optimal power flow model, the comprehensive coordinated control strategy of Qaidam condenser participating in AVC was formed. The good applicability of the control strategy was demonstrated by the example of power grid large disturbance encountered during the AVC joint commissioning test of Qaidam condenser. The presented strategy enhances the condenser’s reactive power source effect in the case of steady-state operation. Meanwhile, it ensures instantaneous strong reactive power support capability in the case of power grid fault. As a result, the strategy gives full play to the performance of the condenser, and improves the level of reactive power and voltage regulation of power grid.

Keywords

• electric system
• condenser
• automatic voltage control (avc)
• reactive power replacement
• high proportion new energy