Signal processing method of parallel multiple power modules, signal processing circuit and signal processing system

Abstract

The present invention discloses a signal processing method of parallel multiple power modules, a signal processing circuit and a signal processing system. The signal processing circuit comprises the signal processing circuit which comprises a state signal switching circuit and a drive signal switching circuit. The method comprises the steps of (S1) obtaining the state signal of each power module, and generating the overall state signal of the parallel multiple power modules based on the obtained each state signal, (S2) driving the multiple power modules to work or stop based on the overall state signal of the parallel multiple power modules. In the condition of the parallel connection of the multple power modules, the transfer process of the driving signals and the state signals of the multiple power modules is effectively carried out, the system resource is saved, and the system is easy to realize, the cost is low, and the reliability is high.

Description

technical field [0001] The invention relates to frequency converters, and more specifically, to a signal processing method, circuit and system for parallel multi-power modules. Background technique [0002] With the continuous increase of wind power unit capacity, the power level of wind power inverters is also gradually increasing, and to achieve higher power inverters, it has become an application trend to use multiple power modules in parallel. The parallel connection technology of multiple power modules in the inverter has the advantages of effectively improving the power level, increasing system reliability and efficiency, reducing costs, and strong flexibility. However, with the increase in the number of parallel power modules, the control and The number of protection class signals also increases accordingly. [0003] At present, the fiber optic solution is mainly used to process the signals of multiple power modules. In the fiber optic solution, the control and prote...

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Problems solved by technology

[0004] The present invention aims at the defect that the signal of the parallel multi-power module of the inverter is separately processed, the development cycle is long and the cost is high in the prior art, and a signal processing method, circuit and system of the parallel multi-power module are provided. The signal conversion process when two power modules are connected in parallel can effectively solve the problems of insufficient control ports and limited software resources, and the design scheme is simple, easy to implement, low cost, and high reliability.

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