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变电站电压无功控制(voltage and reactive power control,VQC)是自动电压控制(automatic voltage control,AVC)系统的重要组成部分。针对传统VQC策略不适应AVC系统且控制效果较差的缺陷,提出了一种新的变电站VQC策略。该策略基于AVC电压目标值、OLTC调节次数和电容器组投切次数构建VQC多目标优化决策模型,对求解模型的可选方案建立目标决策矩阵并进行无量纲处理转化为各目标相对优属度矩阵。为克服单一赋权法的缺点,使权重的确定更为有效合理,综合运用了改进层次分析法(主观赋权法)与离差最大化方法(客观赋权法)以确定各目标的权重值,最后采用多目标决策的线性加权和法求解出最优控制策略。通过算例验证了所提控制策略的可行性和优越性。
Substation voltage and reactive power control (VQC) is an important part of the automatic voltage control (AVC) system. Aiming at the defect that the traditional VQC strategy does not adapt to the AVC system and the control effect is poor, a new substation VQC strategy is proposed. The strategy builds a VQC multi-objective optimization decision model based on the AVC voltage target value, the number of OLTC adjustments and the number of switching times of the capacitor banks, and establishes a target decision matrix for the alternatives of the solution model and converts them into dimensionless relative priority matrix . In order to overcome the shortcomings of the single weighting method and make the determination of the weight more effective and reasonable, the method of AHP (subjective weighting) and maximization of dispersion (objective weighting) are synthetically applied to determine the weights Finally, the optimal control strategy is solved by the linear weighted sum method of multi-objective decision. An example is given to verify the feasibility and superiority of the proposed control strategy.