Voltage and Reactive Power Control in Substation Under Decentralized Control Mode of AVC

Voltage and reactive power control(VQC) in substations is an important component of automatic voltage control(AVC).In view of the defects that traditional VQC strategies are not adapted to AVC and their control effects are unsatisfied,in this paper a new VQC strategy for substation is proposed.According to this strategy and based on desired voltage value of AVC,adjusting times of on-load tap changer(OLTC) and switching times of capacitor banks,a multi-objective decision-making model is constructed.For the selectable schemes to solve the proposed model an objective decision matrix is built and through non-dimension treatment the objective decision matrix is changed into relative superior attribute degree matrix of all objectives.To overcome the shortcoming of single weight determination and make the determination of weight more effective and reasonable,the improved analytical hierarchy process(AHP),i.e.,the subjective weight determining,and dispersion maximization,i.e.,the objective weight determining,are integratively utilized to determine the weight the weights of indices.Finally,the optimal control strategy is solved by multi-objective decision-making based linear weighted sum.The feasibility and superiority of the proposed control strategy are verified by calculation example.