Anti-backflow method and device for grid-connected power generation system

Abstract

The invention provides an anti-backflow method for a grid-connected power generation system. The anti-backflow method comprises the following steps of: A) respectively acquiring power generation power of a photovoltaic system and load power of a load, and calculating a reference quantity alpha, wherein the alpha=power generation power/load power; and B) comparing the reference quantity alpha with a preset adjustment value epsilon 2, and if the reference quantity alpha is larger than the adjustment value epsilon 2, controlling the power generation power and reducing the alpha, wherein the epsilon 2 is more than 0 and less than 1. The reference quantity alpha is reduced to ensure that the value fluctuates in the vicinity of the adjustment value epsilon 2 at most; and simultaneously, as the adjustment value epsilon 2 is less than 1, the possibility of enabling the reference quantity alpha to be more than 1 is very small, namely that the power generation power of the whole grid-connected power generation system can not be more than the power required for the load basically, the existence of surplus electric energy for being sent into an electric fence can be avoided basically, and the possibility of production of backflow is very small. According to the method, by establishing a functional module framework, a computer system is controlled by a computer program command to complete the operation.

Description

technical field [0001] The invention relates to the technical field of backflow prevention, in particular to a method for preventing backflow in a grid-connected power generation system. The method is accomplished by establishing a functional module framework and controlling the computer system by computer program instructions. Background technique [0002] With the continuous reduction of non-renewable energy, more and more attention has been paid to renewable energy such as solar energy and wind energy that can achieve sustainable development of energy and the environment. The focus of renewable energy development. At present, new energy power generation systems such as solar photovoltaic power generation and wind power generation are mainly divided into two categories: independent power generation systems and grid-connected power generation systems. The main purpose of the independent power generation system is to supply power to loads in a certain area. However, due to...

AI Technical Summary

Problems solved by technology

The technical solution of this patent monitors the current and voltage of the grid side through voltage and current measurement and control instruments to judge whether there is excess power entering the grid and takes remedial measures to prevent backflow when excess power enters the grid. Therefore, the technical solution for backflow It is a method of after-the-fact remedy. Although it can play a certain role, there are still excess electric energy being sent to the grid, which may cause danger to the grid.