Isolation type new energy power supply equipment based on three-port power converter

Abstract

The invention discloses isolation type new energy power supply equipment based on a three-port power converter. The isolation type new energy power supply equipment consists of a new energy battery, an energy storage device, an inverse resistance diode, two coupling inductors, four main switching tubes, two clamping switching tubes, two clamping capacitors, two rectifier diodes and two filter capacitors which are mutually connected. By adoption of a staggered parallel structure, the phases of the main switching tubes are controlled, and low ripples of the input current can be realized, so that the maximum power point tracking control of the new energy battery is easily realized; and meanwhile, by adoption of an active clamping structure, soft switching of the main switching tubes can be realized, so that the loss is reduced, and the efficiency is improved. In addition, by adoption of the series structure of two coupling inductors on the load side, high boosting capacity can be realized; the new energy battery can supply power to the load side and can supply power to a storage battery during operation; and when the new energy battery does not work, the new energy battery also can supply power to the load side through the storage battery.

Description

technical field [0001] The invention belongs to the technical field of new energy power conversion, and in particular relates to an isolated new energy power supply device based on a three-port power converter. Background technique [0002] In the new energy power supply system, since the electric energy generated by the new energy is DC with a lower voltage, and in many application scenarios (such as grid-connected power generation systems), a DC with a higher voltage is required, so the new energy power supply system has power conversion. The power converter converts low-voltage direct current into suitable high-voltage direct current; in addition, the power converter also needs to be responsible for the energy management and control among the new energy, battery and load. [0003] The output voltage gain of the conventional boost type (Boost) interleaved parallel DC-DC converter is small, the voltage stress of the power switch tube is large, the power switch tube is hard ...

AI Technical Summary

Problems solved by technology

[0006] (1) Because it is a single magnetic core structure, the transmission power is limited, and this topology cannot be used in occasions with high power;

[0007] (2) Since the essence of the circuit is a half-bridge structure, there is a limited boosting capacity of the secondary side, which limits the application of this topology in high boosting occasions. For example, the input source is a photovoltaic cell or a fuel cell, and the output load is grid-connected. or standalone inverters;

[0008] (3) Due to the large current ripple on the primary side, when it is necessary to control the optimal operating point of the input source, such as a fuel cell or a photovoltaic panel, this topology will encounter great difficulties in control

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