Photovoltaic inverter-based power quality optimization method for distribution transformer district

Abstract

The invention discloses a photovoltaic inverter-based power quality optimization method for a distribution transformer district, belongs to a control technology of a photovoltaic power station, and relates to the field of power quality control and particularly relates to a method for optimizing power quality by fully utilizing the capacity of the photovoltaic power station. The TTU acquires an output threshold value and a reactive compensation power factor set by a transformer in the transformer area, output parameters of a current transformer are acquired through alternating current collection, available capacity and output parameters of a current photovoltaic power station are acquired through communication with a photovoltaic power station, a current state of the transformer area is acquired through parameter comparison, and the output level of the photovoltaic power station is calculated according to the state for adjustment. The method is advantaged in that the countercurrent condition of the transformer area can be prevented as much as possible, the capacity of photovoltaic power generation equipment in the transformer area is fully utilized, active power and reactive power compensation are provided, the equipment is simple, and particularly, when the equipment is applied to application environments of industrial and commercial users, schools, hospitals and the like whichcan be independently powered by one transformer area and have medium-sized scales or above, users can be prevented from being penalty by electric power companies.

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...

AI Technical Summary

Problems solved by technology

[0005] In addition, for medium-sized industrial and commercial users and schools, hospitals and other application scenarios that can be used as a separate power supply for a station area, photovoltaic power generation will also be generated so that the power factor of the electric energy delivered by the grid to the station area is unqualified, and users face being fined by the grid company question

[0006] The existing technology is to adjust and improve the power quality through the combination of photovoltaic inverters, SVG reactive power compensation, capacitors and other equipment. There are many equipments and complicated control

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