Optical storage coordination and output voltage sharing integrated control method for series impedance source converter

Abstract

The invention relates to an optical storage coordination and output voltage sharing integrated control method for series impedance source converter, specifically to an optical storage coordination anddistributed output voltage sharing integrated control method suitable for medium voltage DC power supply system. It solves the problem that the voltage sharing control strategy of the medium voltageDC power supply system is not conducive to the system expansion and the output voltage of the series impedance source converter is unbalanced, which leads to the poor stability of the whole system. The integrated control method of the invention adopts a phase-shifting through modulation mode, wherein, the control variable through angle is used for adjusting the photovoltaic module to realize maximum power tracking, and the output voltage stabilization is realized by controlling the phase-shifting angle between the primary side bridge arms of the transformer. In addition, the average voltage onthe input side is added as a new voltage reference value on the basis of the voltage reference value output by the system. When the output voltage of the series impedance source converter is unbalanced, the voltage sharing is realized by changing the corresponding voltage reference value. The invention is mainly applicable to a medium voltage DC power supply system.

Description

technical field [0001] The invention relates to a comprehensive control method for optical-storage coordination and distributed output voltage equalization of a series impedance source three-port converter suitable for a medium-voltage direct current power supply system. Background technique [0002] In a DC power supply system containing renewable energy power generation, the three-port converter can be used as an interface converter connecting photovoltaic modules, energy storage devices and loads. It can realize power transmission and voltage level matching between power ports, and has a relatively High power density has thus received widespread attention. The impedance source three-port converter combines the quasi-Z source impedance network with the full-bridge converter, in which two ports are connected through the impedance network in a non-isolated manner, and these two ports are isolated from the other port by a high-frequency transformer, using a high-frequency tra...

AI Technical Summary

Problems solved by technology

[0005] The purpose of the present invention is to solve the problem that the voltage equalization control strategy of the medium-voltage DC power supply system is not conducive to system expansion, and the output voltage of the impedance source converter connected in series is unbalanced, which leads to poor stability of the entire system. Synthetic control method for optical-storage coordination and output voltage equalization of series impedance source converters

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