Hierarchical distributed photovoltaic access power distribution network voltage control system and method

Abstract

The invention provides a hierarchical distributed photovoltaic access power distribution network voltage control system and method. The system comprises a feed line voltage controller and local voltage controllers. Each local voltage controller is directed to a local photovoltaic power station. The feed line voltage controller is directed to the whole feed line and coordinates and controls each local voltage controller on the feed line. If the local voltage controller cannot solve the local voltage off-limit problem, the local voltage controller uploads the operation state of the local photovoltaic power station to the feed line voltage controller to which the local voltage controller belongs, and the feed line voltage controller calculates the control amount and issues the control instruction according to electrical information uploaded by the local voltage controller. According to the instruction sent by the feed line voltage controller, the local voltage controller calculates the control amount of the local area, and controls reactive power output of a local reactive power compensator and a local photovoltaic inverter, so to achieve voltage off-limit control in the feed line area. The voltage off-limit problem caused by the photovoltaic access is solved, and the power distribution network voltage distribution meets engineering operation requirements.

Description

technical field [0001] The invention relates to a layered and distributed photovoltaic access distribution network voltage control system method, which belongs to the technical field of distribution network automation. Background technique [0002] Power system reactive power optimization is an effective means to ensure the safe operation of the system and improve the voltage distribution. Usually, the voltage control of the distribution network adopts a centralized management method for management and control. Commonly used control strategies, such as the nine-zone diagram control strategy based on the measurement of outlet end nodes, realize voltage control through voltage and reactive power control devices. However, after the distributed power supply is connected, the increase in the active output of the distributed power supply makes the power factor too low, which may easily lead to misoperation of the voltage and reactive power control device. The extensive incorporat...

AI Technical Summary

Problems solved by technology

[0007] Aiming at the deficiencies of the existing technology, the present invention proposes a layered and distributed photovoltaic access distribution network voltage control system and method, which can solve the voltage limit problem caused by photovoltaic access, and make the distribution network with photovoltaic access Grid voltage distribution meets project operation requirements

[0010] If the local voltage controller cannot solve the problem of local voltage exceeding the limit, it will upload the operating status of the local photovoltaic power plant to the feeder voltage controller, and the feeder voltage controller will calculate and control the control quantity according to the electrical information uploaded by the local voltage controller Issuance of instructions; the local voltage controller calculates the control quantity in the local area according to the instructions issued by the feeder voltage controller, and controls the reactive power output of the local reactive power compensation device and the local photovoltaic inverter to realize the feeder area Voltage limit control within the

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