基于模糊专家推理的500kV变电站自动调压控制方法研究

Study of automatic voltage control approach based on fuzzy-expert inference for 500kV substations

变电站的电压无功控制是保证电能质量和电力系统安全可靠运行的重要措施。本文分析了当前电压无功控制方法存在的不足,把模糊推理和专家系统相结合,提出一种500kV变电站新型电压无功控制方法。本方法利用模糊推理处理模糊性和不确定性问题的优点,很好地解决了电压越限的模糊边界问题,克服了固定边界控制方法存在的不足。同时,依据专家系统很强的逻辑推理和问题综合的能力,综合调压控制的限制条件、优化原则和设备保护闭锁信息等,实现电容器、电抗器和变压器分接头在变电站各种运行状态下的最佳配合。实验表明,本方法能大大改善变电站系统的调压控制性能、提高电压质量,具有良好的应用价值。

The voltage and reactive power control of the substation is an important approach that ensures the voltage quality and the power system operating securely and reliably. This paper analyzes the shortage of the methods used in the voltage and reactive power control at present, and proposes a new method of the voltage and reactive power control, which is based on the fuzzy expert inference. The proposed method solves the fuzzy boundary problem of bus voltage and overcomes the shortage of the fixed boundary control methods. In addition, it combines the limiting conditions and optimized standards in voltage control and the protective and locked information in substation, and realizes the best coordination of capacitor, reactor and transformer tag in various running status of substation. The experimental result for 500kV substation shows that the proposed method improves greatly the performance of voltage and reactive power control and improves the voltage quality, and has the well application foreground.