An all-round soft-switching AC-DC hybrid energy router

Abstract

An all-round soft-switching AC-DC hybrid energy router, including a three-phase bidirectional rectifier unit, a dual active full-bridge conversion unit, an all-round zero-voltage soft-switching unit, an interleaved parallel Boost unit, a four-switch Buck-Boost unit, a single-phase Full-bridge bidirectional inverter unit, high-voltage DC bus, low-voltage DC bus, Hall current sampling, voltage sampling, DSP control board, drive circuit, auxiliary power supply. The all-round zero-voltage soft switching unit used in the dual active full-bridge converter in this device is divided into 7 modes in one cycle, which greatly reduces the switching loss of the dual active full-bridge converter. The new structure improves SST's ability to support the distribution network and improve power quality. The DC bus is drawn out so that DC loads, energy storage devices, and photovoltaic equipment can be connected to the local energy Internet, realizing distributed equipment and distribution in the region. The power exchange between grids solves the problem of local consumption of new energy and lays a hardware foundation for the optimization of power economy.

Description

technical field [0001] The invention belongs to the field of energy Internet and the field of electric energy conversion technology of power electronics, and specifically relates to an AC / DC hybrid energy router device with all-round soft switching. Background technique [0002] As the network structure of the interconnected system becomes more and more complex and the system capacity continues to increase, it is possible to realize large-area and multi-energy optimal configuration to achieve better economy, and at the same time bring security risks to the safe operation of the power grid. Secondly, with the continuous improvement of the penetration rate of new energy in the power grid, new energy equipment such as photovoltaic power generation and wind power generation has the characteristics of wide distribution, small capacity, instability, and mixed AC and DC sources. The power system is integrated into power electronic equipment in power generation, power transmission, ...

AI Technical Summary

Problems solved by technology

[0003] The current conversion device with solid-state transformer as the core, due to its simple topology, has a large energy loss in the process of power conversion, and cannot meet the current requirements for high efficiency, high power density, and low loss of energy routers; traditional solid-state transformers The control method is single, and it is only considered from the perspective of grid connection. Now, the access of renewable energy such as photovoltaic power generation and wind power generation has brought new challenges to the normal operation of the grid. Traditional solid-state transformers are not well qualified

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