Alternating-direct current power supply system for variable frequency equipment and variable frequency air conditioner

Abstract

The invention discloses an alternating-direct current power supply system for variable frequency equipment and a variable frequency air conditioner. The alternating-direct current power supply system comprises direct current power supply wiring terminals, alternating current power supply wiring terminals, a direct current sampling circuit and a controller; the alternating current power supply wiring terminals are connected with a direct current bus voltage input end of a first inversion unit through a first rectifier bridge; the direct current power supply wiring terminals are connected with the direct current bus voltage input end of the first inversion unit sequentially through a second inversion unit, an isolation transformer and a second rectifier bridge; and the direct current sampling circuit acquires direct current voltage input by the direct current power supply wiring terminals and outputs to the controller through the direct current isolation transformer. Since the alternating-direct current power supply system is designed, the variable frequency equipment such as the variable frequency air conditioner can be directly powered by an alternating current mains supply and a public direct current power grid or direct current energy generated by renewable energy sources; the working requirements of long-term continuous operation of the variable frequency equipment can be met; and the variable frequency equipment is greener and more environment-friendly.

Description

Technical field [0001] The invention belongs to the technical field of frequency conversion systems, and specifically relates to a power supply system for providing power supply for frequency conversion equipment and a frequency conversion air conditioner designed by using the power supply system. Background technique [0002] With the development and use of solar, wind and geothermal energy, more and more regions are using renewable energy for power supply worldwide. Since most of the electricity generated by renewable energy is direct current, and most of the existing electrical equipment requires AC power supply. Therefore, in order to be able to make full use of the direct current electricity generated by renewable energy simply and conveniently, the current The solution is mainly to convert the DC power generated by renewable energy into AC power, and then merge it into the AC mains grid, and use the mains grid to supply power for various electrical equipment. [0003] Howev...

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Problems solved by technology

[0003] However, this grid-connected power supply design scheme is only suitable for power supply companies in various countries, and requires extremely high construction costs to build renewable energy substations to realize the supply of renewable energy to traditional energy. There are different degrees of difficulties in terms of site and power grid laying, or in future power grid maintenance.

Moreover, for some countries that have been equipped with public DC power grids or enterprises or households that have independently installed renewable energy power supply equipment, the existing electrical equipment that only supports AC power supply cannot make full use of these energies. Significant underutilization of the public DC grid and renewable energy

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