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Converter based on three-port distributed photovoltaic energy storage hybrid structure

A distributed photovoltaic, hybrid structure technology, applied in photovoltaic power generation, output power conversion devices, AC power input into DC power output and other directions, can solve problems such as use restrictions, achieve convenient power balance, small grid impact, and The effect of good quality of grid power

Inactive Publication Date: 2019-12-20
ELECTRIC POWER RES INST OF STATE GRID ZHEJIANG ELECTRIC POWER COMAPNY
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  • Claims
  • Application Information

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Problems solved by technology

[0005] The traditional rectifier and inverter circuit has one port on the DC side, and its use is subject to certain restrictions; especially in the field of new energy such as distributed photovoltaic power generation, multi-port parallel access technology on the DC side is required

Method used

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Embodiment Construction

[0026] In order for those skilled in the art to better understand and implement the present invention, the technical solution of the present invention will be described in detail below in conjunction with the accompanying drawings and specific embodiments, but the present invention is not limited to this embodiment.

[0027] A converter based on a three-port distributed photovoltaic energy storage hybrid structure adopts a single-star topology, which includes an energy storage medium part, a power stage part, and an LCL filter part; the energy storage medium part includes an energy storage battery Battery and a photovoltaic Array PV. The whole converter passes through the filter circuit (that is, the LCL filter part) and is connected to the three-phase power grid.

[0028] The power stage part includes a DC side anti-reverse diode D 0 , a three-phase bridge arm structure composed of multiple power switches and a bidirectional switch, the anode of the photovoltaic array is con...

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Abstract

The invention discloses a converter based on a three-port distributed photovoltaic energy storage hybrid structure. The converter disclosed by the invention adopts a single star topology structure, which comprises an energy storage medium part, a power stage part and an LCL filtering part; the energy storage medium part comprises an energy storage battery and a photovoltaic array; the power stagepart comprises a DC side anti-reflection diode, a three-phase bridge arm structure composed of multiple power switches, and bilateral switches, and an anode of the photovoltaic array is connected to the anode of the anti-reflection diode; and the other ends of the three bilateral switches are connected with midpoints of three bridge arms and the LCL filtering part. According to the converter disclosed by the invention, the switches of a three-phase bridge arm of the power stage of the converter and the bilateral switches are reused, and the photovoltaic array and the energy storage battery aredispersed into a main power circuit, which facilitates the power balance of the photovoltaic array and the energy storage battery.

Description

technical field [0001] The invention belongs to the technical field of power electronic systems, in particular to a converter based on a three-port distributed photovoltaic energy storage hybrid structure. Background technique [0002] Distributed photovoltaic power generation has the advantages of clean and environmental protection, flexible construction, nearby utilization, and little impact on the power grid by a single unit. It is of great significance to optimize energy structure, promote energy conservation and emission reduction, and achieve sustainable economic development. It has become one of the important forms of solar energy utilization. one. However, the output of distributed photovoltaic power generation has the disadvantages of randomness and intermittency. After being connected to the grid, it will cause adverse effects such as power fluctuations and power quality degradation of the grid. In order to suppress the adverse impact on the grid after distributed...

Claims

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Application Information

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IPC IPC(8): H02M7/797H02J3/38H02J3/32H02J7/35
CPCH02J3/32H02J7/35H02M7/797Y02E10/56Y02E70/30
Inventor 陈超阙波周金辉苏毅方马振宇邓焰阮杰李广地
Owner ELECTRIC POWER RES INST OF STATE GRID ZHEJIANG ELECTRIC POWER COMAPNY
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