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Transformer-free solar inverter topological structure based on MMC

A topology and inverter technology, which is applied in the direction of irreversible DC power input conversion to AC power output, climate change adaptation, output power conversion devices, etc., can solve the problem of large equipment investment, long production cycle, and large footprint and other issues, to achieve the effect of reducing equipment cost, reducing equipment volume, and reducing equipment manufacturing cycle

Inactive Publication Date: 2011-04-13
RONGXIN POWER ELECTRONICS
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  • Application Information

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Problems solved by technology

The solar inverter in the prior art is to invert the DC voltage synthesized by the battery array into three-phase AC power, which is sent to the power grid after passing through the transformer. long cycle

Method used

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  • Transformer-free solar inverter topological structure based on MMC
  • Transformer-free solar inverter topological structure based on MMC
  • Transformer-free solar inverter topological structure based on MMC

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Embodiment Construction

[0025] See figure 1 , a transformerless solar inverter topology based on MMC, including a photovoltaic cell array, a DC conversion circuit, and an inverter composed of multiple standard power units. The DC voltage generated by the photovoltaic cell array is converted into a stable DC voltage by the DC conversion circuit After the DC voltage, as the DC side voltage of each standard power unit in the inverter, by controlling the on and off of the switching devices of each power unit, the synthesis of the three-phase AC voltage of A, B, and C is realized, and the high-voltage output is directly achieved , directly into the grid without a transformer. This topology is based on half-bridge series technology, and the type of power unit used is a modular multilevel modular multilevel converter, called MMC standard power unit, which is a half-bridge structure. It can directly achieve high-voltage output and be directly connected to the power grid without the need for a transformer, w...

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Abstract

The invention relates to a transformer-free solar inverter topological structure based on an MMC, which comprises a photocell array, a direct-current converting circuit and an inverter consisting of a plurality of standard power units, wherein a direct-current voltage generated by the photocell array is converted into a stable direct-current voltage through the direct-current converting circuit to be used as a direct-current side voltage of each standard power unit in the inverter, the synthesis of a three-phase alternating-current voltage is realized through controlling the on and the off of a switching element of each power unit so as to directly achieve the purpose of high-voltage output and access power grid. The invention has the advantages of realization of high-voltage output by adopting a superpositioning manner of the standard power units without arranging a transformer at the synchronization side of a photovoltaic system, low cost, space saving, simple structure and high response speed.

Description

technical field [0001] The invention relates to a transformerless solar inverter topology based on an MMC (Modular Multilevel Converter) modular multilevel inverter. Background technique [0002] In the current era of energy shortage, photovoltaic power generation as a renewable energy is generally recognized and vigorously developed. China's development of light energy is relatively backward, and the technology is on the rise. China has a large land area, and the annual solar radiation exceeds 600kJ / cm 2 , the solar energy absorbed by the surface every year is equivalent to the energy of 17 trillion tons of standard coal, so it has a good development prospect. [0003] Photovoltaic cells are the main devices that convert light energy into electrical energy. Photovoltaic power generation systems usually use a photovoltaic cell array composed of several photovoltaic cells to achieve a higher input voltage of the grid-connected inverter. [0004] A solar inverter, also know...

Claims

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Application Information

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IPC IPC(8): H02M7/48
CPCH02M7/493H02M7/483H02J3/383H02M2007/4835Y02E10/563Y02E10/56H02J2300/24H02J3/381Y02A30/60H02J3/466H02M7/4835
Inventor 张坤张跃平胡涛李太峰魏西平杨洋赵淑玉王振
Owner RONGXIN POWER ELECTRONICS
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