Current-sharing control method and system for parallel modular inverse power supply

Abstract

This invention discloses one parallel module inverter power even current control method and system, wherein, the method comprises the following steps: comparing two inverter modules output values and taking maximum value as even current signal through even bus into other inverter module to control other inverter output value; the control system testing each inverter module DC / DC voltage control circuit output signals through CPU process through connection control bus feedback signals to each inverter module DC / AC to control each inverter module output. The relative system comprises at least two parallel load inverter module, one control system to control sine and cosine modulation signal generator through control bus to output the modulation signal to inverter module to adjust inverter module output.

Description

[technical field] [0001] The invention relates to the technical field of power electronics, in particular to a current balance control method and system among modules of a parallel modularized inverter power supply system. [Background technique] [0002] With the development of power electronics technology, various electronic devices have higher and higher requirements for power and current. Using multiple power modules in parallel to supply power can not only provide the required current, but also An N+X redundant structure is formed, which improves the stability of the system. However, when the power modules are running in parallel, due to the dispersion of the parameters of each module, the output currents cannot be exactly the same, resulting in some modules being overloaded and some modules being overloaded, which will reduce the stability of the system. It is a problem that must be solved to improve the stability of the parallel power supply system to distribute the o...

AI Technical Summary

Problems solved by technology

Its disadvantages are: there needs to be communication between each module, and the connection is more complicated; once the main module fails, the entire power system will collapse, and it cannot be used in a redundant structure

Its disadvantages are: the current sharing bus must be used. If a module is short-circuited with the current sharing bus, the system will not be able to share current, and the current limiting of a single module may also cause system instability.

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