Sine wave inverter parallel system with variable current ratio

Abstract

The invention discloses a sine wave inverter parallel system with variable current ratio, which is characterized by comprising a monitoring management unit and one or a plurality of inverter power supply modules in redundancy parallel operation; the monitoring management unit is connected with all the inverter power supply modules through a communication signal wire; the inverter power supply modules are mutually connected by the communication signal wires, synchronous signal wires and average current signal wires; and each inverter power supply module is simultaneously connected with a DC (Direct Current) input end and an AC (Alternating Current) output end. The proportion of the load current shared by each module of the parallel system provided by the invention can be set as required so as to meet the requirements on uniform load current sharing (current equalization) by parallel inverter power supply modules with same capacity or load current sharing by the inverter power supply modules with different capacities in the parallel system according to different proportions, so that the parallel function of the inverter power supply modules with different capacities is realized.

Description

technical field [0001] The invention relates to the field of AC inverter power supplies, in particular to a sine wave inverter parallel system with variable current ratio. Background technique [0002] The inverter is a power electronic conversion device that converts DC power into AC power, and its main function is to provide AC power for electrical equipment. The sine wave inverter refers to the inverter whose AC output voltage is a sine wave, and the inverters in the following descriptions all refer to the sine wave inverter. [0003] In the case of using the inverter to supply power to the load, in order to improve the reliability of the inverter power supply system, or when the capacity of a single inverter cannot meet the load demand, multiple modules can be used to form an inverter parallel system to Work. In order to make the system have a capacity corresponding to the number of modules connected in parallel, it is required that each inverter connected in parallel ...

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Problems solved by technology

[0008] The present invention aims at the problems of complex control schemes and inability to realize parallel connection of inverters with different capacities existing in the existing inverter parallel connection system, and proposes a redundant inverter parallel connection system with variable current ratio, which can realize arbitrary parallel connection modules Share the load current according to the set ratio, and the steady-state and dynamic performance parameters of the parallel system are not lower than that of a single module

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