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Efficient no-transformer single phase photovoltaic grid-connected inverter

A transformer and inverter technology, applied in the field of high-efficiency transformerless single-phase photovoltaic grid-connected inverters, can solve problems such as increased common mode current and potential safety hazards, and achieve the effects of suppressing common mode current, simple control, and improved efficiency

Inactive Publication Date: 2013-03-20
艾伏新能源科技(上海)股份有限公司
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  • Claims
  • Application Information

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Problems solved by technology

However, the grid-connected inverter without an isolation transformer makes an electrical connection between the photovoltaic (PV) and the grid, and the common-mode current is greatly increased, which brings potential safety hazards

Method used

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  • Efficient no-transformer single phase photovoltaic grid-connected inverter

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Embodiment Construction

[0018] refer to Figure 1-8 , the specific embodiment adopts the following technical solutions: it includes a solar photovoltaic array 1, a boost circuit 2, a DC-AC inverter 3, a relay 4, a power grid 5 and a leakage current loop 6, a solar photovoltaic array 1, a boost circuit 2. The DC-AC inverter 3, the relay 4 are connected to the grid 5 in sequence, the relay 4 is connected to the grid 5, and the booster circuit 2 is connected to the leakage current loop 6, and the leakage current loop 6 is connected to the grid 5.

[0019] The solar photovoltaic array 1 in this specific embodiment is the input of a single-phase photovoltaic inverter, which provides electric energy for the entire system including the control circuit. Under the condition of daytime light, the solar cell array converts the received light energy into electrical energy, through the BOOST booster circuit, through the DC-AC (DC-AC) inverter, the DC is converted into AC, and the power is transmitted to the grid....

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Abstract

The invention provides an efficient no-transformer single phase photovoltaic grid-connected inverter and relates to an inverter. The efficient no-transformer single phase photovoltaic grid-connected inverter comprises a solar photovoltaic array (1), a booster circuit (2), a direct current-alternating current (DC-AC) inverter (3), a relay (4), a power grid (5) and a leak current loop (6), the solar photovoltaic array (1), the booster circuit (2), the direct current-alternating current (DC-AC) inverter (3), the relay (4) and the power grid (5) are connected with one another in sequence, the relay (4) is connected with the power grid (5), besides the booster circuit (2) is connected with the leak current loop (6), and the leak current loop (6) is connected with the power grid (5). The efficient no-transformer single phase photovoltaic grid-connected inverter can effectively restrain a common mode current, and the highest efficiency of a topological structure can be up to 96%.

Description

Technical field: [0001] The invention relates to an inverter, in particular to a high-efficiency transformerless single-phase photovoltaic grid-connected inverter. Background technique: [0002] With the increasing depletion of energy, solar energy has become a very potential green energy, and photovoltaic power generation is currently the main way to utilize solar energy. For grid-connected photovoltaic grid-connected inverters, there are two topologies with isolation transformers and without isolation transformers. For grid-connected inverters with isolation transformers, a power frequency transformer is usually added to the grid side to achieve electrical isolation between the DC side of the photovoltaic array and the grid side; a high-frequency isolation transformer can also be added to the DC side to achieve electrical isolation between the grid side and the DC side. Due to the low frequency on the grid side, the isolation transformer on the grid side is bulky, heavy a...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02M7/48H02M3/155H02M7/5387
CPCY02E10/56
Inventor 杨勇赵方平王仁峰魏冬冬
Owner 艾伏新能源科技(上海)股份有限公司
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