A Robust Voltage Control Method for Active Distribution Network Based on Active and Reactive Power Coordination

Abstract

The invention relates to an active power and reactive power-coordinated active power distribution network robust voltage control method and belongs to the power system optimization operation control field. According to the method of the invention, an objective function of optimal control is established, and an interval scheduling mode of photovoltaic power generation is put forward, and a three-phase power flow equation under highest voltage and lowest voltage conditions in the operation of an active power distribution network is utilized, and grouped capacitors are processed through utilizing a binary coding mode, and therefore, discrete control problems can be processed continuously; and finally, the reactive power of photovoltaic and continuous reactive compensation devices and the grouped capacitors and a permissible active power interval issued to a photovoltaic power station are controlled comprehensively, so that the method can be adaptable to the uncertainty of photovoltaic power generation and load power in the active power distribution network. Optimal control strategies obtained through adopting the method can guarantee safe voltage when photovoltaic power generation and load power fluctuate in an uncertain interval, and voltage control of the active power distribution network can be benefitted.

Description

technical field [0001] The invention relates to a robust voltage control method for an active power distribution network coordinated with active and reactive power, and belongs to the field of power system optimal operation control. Background technique [0002] For the distribution network with high penetration rate of photovoltaic access, the impact of photovoltaic power generation on the safe operation of the power grid cannot be ignored. The power of photovoltaic power generation depends on the intensity of light, so it is random and intermittent. The large-scale distribution network is limited by investment and maintenance costs. Real-time measurement devices are rarely installed, and the measurement values ​​used for state estimation are mostly pseudo-measurements of load power. Therefore, the observability of the distribution network is relatively poor, and the state estimation results In particular, load estimation errors are large. Traditional deterministic voltag...

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Problems solved by technology

The large-scale distribution network is limited by investment and maintenance costs. Real-time measurement devices are rarely installed, and the measurement values ​​used for state estimation are mostly pseudo-measurements of load power. Therefore, the observability of the distribution network is relatively poor, and the state estimation results In particular, load estimation errors are large

Traditional deterministic voltage optimization control is based on hypothetical "accurate" data, without considering the uncertainty of photovoltaic power generation and the estimation error of load, so the optimization strategy obtained by it cannot guarantee that photovoltaic power generation and load power are within the uncertainty range Grid voltage remains safe during fluctuations

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