Photovoltaic auxiliary commercial power AC power supply system

Abstract

The invention discloses a photovoltaic auxiliary commercial power AC power supply system comprising a solar cell boosting module which provides high voltage DC, a high voltage DC / AC inversion module which converts the high voltage DC and outputs photovoltaic power supply AC having the same frequency and the same phase with those of commercial power, and a power supply module which performs AC isolation and line combination on the commercial power and the photovoltaic power supply AC and the supplies power to a load. The AC isolation and line combination power supply module comprises a one-way coupling isolation control circuit which is connected with the commercial power and provides commercial power AC to the load at the output end. The photovoltaic power supply AC and the output end of the one-way coupling isolation control circuit are connected in parallel and then supply power to the load together. The one-way coupling isolation control circuit only allows passing of the commercial power and prevents the photovoltaic power supply AC from feeding into the commercial power grid. The photovoltaic auxiliary commercial power AC power supply system is simple and reasonable in structure, low in manufacturing cost without storage battery and pollution-free to the environment so that the reactive current of the load can be prevented from entering the commercial power grid.

Description

technical field [0001] The invention relates to the field of photovoltaic grid-connected power supply, in particular to an AC power supply system for photovoltaic auxiliary mains power. Background technique [0002] With the increasingly prominent environmental problems caused by the burning of fossil energy and the gradual consumption of non-renewable energy, it is foreseeable that human beings will exhaust it sooner or later in the future, and the demand for new green energy that can be permanently and sustainably supplied is becoming increasingly urgent. Solar energy is the source of all recyclable energy on the earth, and it is inexhaustible energy. Therefore, judging from the current state of technological development, it can be said that solar energy is the main way for human beings to supply energy in the long-term future. In recent years, the governments of various countries have vigorously supported the development of the photovoltaic industry. The cumulative instal...

AI Technical Summary

Problems solved by technology

[0004] The technical problem to be solved by the present invention is to overcome the harshness of low-power photovoltaic inverter grid-connected technology and The disadvantage of cost is to realize new energy power generation while avoiding affecting the quality of the grid, and to provide a simple and reasonable structure, low production cost, no battery, and no pollution to the environment. A photovoltaic-assisted mains AC power supply system

Images