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CCM-based micro inverter and control method thereof

A micro-inverter, mode technology, used in control/regulation systems, irreversible DC power input conversion to AC power output, instruments and other directions, can solve the problems of complex PI control parameter correction, large flyback conversion circuit transformers, etc.

Active Publication Date: 2014-03-19
CHANGSHA VICTORY ELECTRICITY TECH
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] However, the micro-inverter in CCM mode is a non-minimum phase system, and the correction of PI control parameters is relatively complicated, and the transformer of the flyback conversion circuit in CCM mode is relatively large. There is no micro-inverter in CCM mode in the foreign market

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  • CCM-based micro inverter and control method thereof
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  • CCM-based micro inverter and control method thereof

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Embodiment Construction

[0042] The present invention will be further described below in conjunction with the accompanying drawings and embodiments.

[0043] Such as figure 1 As shown, it is a schematic structural diagram of a micro-inverter based on the CCM mode of the present invention, including an interleaved flyback conversion circuit 102, a full-bridge inverter circuit 103, an EMI filter circuit 104, and a control system 106. The interleaved flyback conversion The input end of the circuit is connected to the photovoltaic cell 101, the input ends of the interleaved flyback conversion circuit, the full-bridge inverter circuit, and the EMI filter circuit are connected to the power grid 105 in turn, and the two ends of the photovoltaic cell, the interleaved flyback conversion circuit The switch control terminal of the MOS tube, the primary side of the transformer in the interleaved flyback conversion circuit, each switch control terminal of the full-bridge inverter circuit, the output terminal of th...

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Abstract

The invention discloses a CCM-based micro inverter and a control method thereof. The micro inverter employs a universal ARM chip STM32 as a main control chip of a micro inverter control system, by use of AD conversion of the chip, and the inherent functions of a timer, a temperature sensor and an embedded FLASH and the like, the requirements for micro inverter AD conversion, PWM wave duty ratio control, power failure protection and temperature protection are finished, and the system total cost is lowered; the control method enables a micro inverter flyback transformation circuit to work in a CCM, reduces the switch frequency, enables the control of the universal ARM chip STM32 to be realized, reduces switch loss at the same time, reduces requirements for a filter, further decreases the system cost and improves the working efficiency, and the actual measured highest efficiency can reach 94.63%.

Description

technical field [0001] The invention relates to a micro-inverter based on a CCM mode and a control method thereof. Background technique [0002] Before the electric energy generated by photovoltaic cells is incorporated into the grid, it must be reversed by an inverter to make it meet the grid standard before it can be connected to the grid. Photovoltaic power generation systems increasingly tend to use distributed micro-inverters as DC-AC conversion tools, and the rapid development of large-scale integrated circuits and DSP technology enables full digital control of micro-inverters. [0003] The flyback conversion circuit is one of the components of the main circuit of the micro-inverter, and its working mode is divided into CCM (continuous current mode) and DCM (discontinuous current mode). Compared with the DCM mode, the CCM mode flyback conversion circuit has a small peak current of the primary side and the secondary side of the transformer, lower requirements on the cu...

Claims

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Application Information

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IPC IPC(8): H02M3/335H02M7/48H02J3/38
CPCY02E10/563Y02E10/56
Inventor 杨建阮璇粟梅张鹏飞孙尧王海龙
Owner CHANGSHA VICTORY ELECTRICITY TECH
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