Reactive Voltage Control Method of Distribution Network Based on Multi-energy Coordination

Aiming at the coupling relationship between the pressure regulation of thermal and gas systems and the reactive power balance of power grid in electric-heat-gas multi-energy systems, a reactive power optimization model for multi-energy systems is proposed based on the reactive power demand characteristics in the energy transport process of thermo-gas systems. This paper studies the reactive power and output characteristics and their uncertainty of various power sources, and the reactive power demand characteristics of various energy transport processes, and establishes the reactive power balance and its uncertainty model of distribution network for a multi-energy system consisting of electricity, heat and gas with large-scale renewable energy supply. On this basis, the reactive power adjustable capacity quantization model based on the pressure adjustable limit parameters of heat, cold, hydrogen and gas energy medium transport pipeline and the corresponding reactive power demand capacity is studied, and the reactive power demand model under the coupling relationship between power grid and gas network is established to reduce voltage fluctuation. Establish the economic cost model of reactive power compensation device, reactive power supply and pump station; The uncertainty of reactive power balance and the constraint of source network load storage operation are further considered. In order to minimize the voltage fluctuation and the lowest cost, the reactive voltage control method of multi-time scale coordination and optimization is adopted to realize the stable reactive voltage control of distribution network through the reactive power optimization control of multi-energy regulation.