Study on Parallel Parallel Flow Control of Modular Direct Current Power Supply Based on Virtual Impedance
There are differences in the parameters between the modules of the direct current power supply,which leads to circulating current problems when the modular direct current power supply operates in parallel.To solve this problem,a modular direct current power supply parallel current sharing control based on virtual impedance was studied.The article detects the circulating current between modules during the parallel operation of modular direct current power supplies,designs a pure resistive virtual impedance,and adds a control structure for the parallel direct current power supply system.The designed virtual impedance suppresses circulating currents between parallel power supply modules by adjusting the virtual impedance,achieving modular direct current power supply parallel current sharing control.The experimental results show that the maximum deviation of the load current between the parallel direct current power supply modules under the design method is only 0.58 A,which can achieve good current sharing control.
virtual impedancemodular direct current powerdirect current power parallelhomogeneous flow control
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