A power quality optimization method for distribution transformer area based on photovoltaic inverter

Abstract

A photovoltaic inverter-based power quality optimization method for a distribution transformer area belongs to the control technology of a photovoltaic power station and relates to the field of power quality control, in particular a method for optimizing power quality by making full use of the capabilities of a photovoltaic power station. TTU obtains the output threshold and reactive compensation power factor set by the transformer in the station area, obtains the output parameters of the current transformer through AC collection, obtains the available capacity and output parameters of the current photovoltaic power station through communication with the photovoltaic power station, and obtains it through parameter comparison According to the current state of the station area, the output level of the photovoltaic power station is calculated and adjusted according to the state. By adopting the present invention, it is possible to prevent reverse flow in the station area as much as possible, and make full use of the ability of the photovoltaic power generation equipment in the station area to provide active power and reactive power compensation. The equipment is simple, and it is especially applied to medium-sized and above-sized plants that can be used as a separate power supply for a station area. In the application environment of industrial and commercial users, schools, hospitals, etc., users can be prevented from being fined by the power company.

Description

technical field

[0001] The invention belongs to the control technology of a photovoltaic power station, and relates to the field of power quality control, in particular to a method for optimizing power quality by making full use of the ability of a photovoltaic power station. Background technique

[0002] In order to prevent the electric energy generated by the photovoltaic power generation system from entering the public grid (countercurrent), causing an impact on the public grid and resulting in a decline in the power quality of the public grid, the state has formulated Q / GDW480-2010 "Technical Regulations for Connecting Photovoltaic Power Stations to the Grid", which clearly stipulates that In addition, for areas with weak power grids, photovoltaic power generation systems must be equipped with anti-backflow devices. The State Grid Corporation of China requires that when the photovoltaic power generation system is designed to be irreversible grid-connected, when the rever...

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