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针对特高压电网发展对自动电压控制(AVC)系统的技术需求,分析了现有AVC系统控制方式对特高压联网的适应性。通过对传统基于经济压差的无功电压控制策略进行优化调整,提出了多级AVC协调的特高压电网无功电压控制策略,实际电网数字仿真证明了该策略的有效性和可行性。该策略的实施可以实现特高压层面和500kV电网层面的无功功率实时分层平衡控制,显著降低网损,提高电网运行经济效益。同时,可实现特高压电网AVC系统和省级电网AVC系统的有效衔接,尽量减少对已有省级电网AVC系统的升级改造工作,节约了电网投资。
In view of the technical requirements for the development of UHV power grids for AVC systems, the adaptability of existing AVC system control methods to UHV networking is analyzed. Based on the optimization and adjustment of traditional reactive voltage control strategy based on economic pressure difference, a multi-level AVC coordinated reactive voltage control strategy for UHV power grid is proposed. Actual power network digital simulation proves the effectiveness and feasibility of the strategy. The implementation of this strategy can realize real-time hierarchical balance control of reactive power at UHV level and 500kV grid level, significantly reducing network loss and improving economic benefits of grid operation. At the same time, the effective connection between the UHV power grid AVC system and the provincial power grid AVC system can be realized, the upgrading and transformation of the existing provincial power grid AVC system can be minimized, and the power grid investment can be saved.