A solar-diesel complementary controller based on grid-connected inverter and its working method

Abstract

The invention belongs to the field of photovoltaic and diesel power generation complementary controllers, and particularly relates to a grid-connected inversion-based solar-diesel complementary controller. The grid-connected inversion-based solar-diesel complementary controller comprises a central processor module, wherein a signal input end of the central processor module is connected with a signal output end of an electric quantity detection module; a power supply input end of the central processor module is connected with a power supply output end of an auxiliary power supply module; the signal output end of the central processor module is connected with the signal input end of the switch control module; the central processor module and a communication module are in tow-way communication connection; two signal output ends of the switch control module are connected with a diesel generator and a switching signal input end of a power grid respectively; the diesel generator is used for supplying electricity to a load; the communication module and a photovoltaic inverter are in tow-way communication connection; the photovoltaic inverter is used for supplying electricity to the load, so that the condition that a grid-connected photovoltaic power generation system and a diesel engine can simultaneously work and can carry out supplementary electricity generation is ensured; environment-friendly photovoltaic power is utilized to the maximal extent; diesel oil is saved; and emission of carbon dioxide is reduced.

Description

technical field [0001] The invention belongs to the field of complementary controllers for photovoltaic and diesel power generation, in particular to a photovoltaic and diesel complementary controller based on grid-connected inverter and its working method. Background technique [0002] With the technological advancement and cost reduction of photovoltaic grid-connected systems, under the vigorous promotion of national policies, small and medium-sized photovoltaic grid-connected power generation systems have begun to be widely used, and have gradually been promoted and applied from cities to rural areas. Rural power grids are due to factors such as imperfect facilities , frequent power outages and other troubles, due to some technical problems and the relevant standards of the State Grid, the photovoltaic grid-connected system must stop generating power immediately after the power outage, but for some important loads such as grain storage, communication base stations, and TV ...

AI Technical Summary

Problems solved by technology

[0017] After the power grid is restored and before K2 is closed, the photovoltaic power remains in the same phase, frequency, and amplitude as the diesel power and is different from the grid power. After K2 is closed, the two AC powers with different phases, frequencies, and amplitudes are forced to be connected together. It is bound to cause a large inrush current, damage and burn down photovoltaic inverters and other equipment

Images