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A kind of mppt centralized mode exit, switching method and related application

A centralized mode and one-way technology, which is applied in the field of switching and MPPT centralized mode exit, can solve the problems of inability to achieve high overall conversion efficiency and high MPPT efficiency, and the reduction of MPPT efficiency of photovoltaic inverters, so as to achieve high overall conversion Efficiency and high MPPT efficiency, improve MPPT efficiency, achieve a balanced effect

Active Publication Date: 2018-06-12
SUNGROW POWER SUPPLY CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] However, when the light intensity changes, the maximum power point of each photovoltaic cell in the photovoltaic module may deviate from the overall maximum power point of the photovoltaic module, resulting in a decrease in the MPPT efficiency of the photovoltaic inverter, making it impossible to achieve high overall conversion efficiency and Compromise of high MPPT efficiency

Method used

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  • A kind of mppt centralized mode exit, switching method and related application
  • A kind of mppt centralized mode exit, switching method and related application
  • A kind of mppt centralized mode exit, switching method and related application

Examples

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Embodiment 1

[0036] Embodiment 1 of the present invention discloses an MPPT (Maximum Power Point Tracking, Maximum Power Point Tracking) centralized mode exit method applied to photovoltaic inverters, so as to achieve both high conversion efficiency and high MPPT of the photovoltaic inverter efficiency. Wherein, the photovoltaic inverter includes multiple DC chopper circuits and one inverter circuit, and the inverter circuit is connected to the parallel output side of the multiple DC chopper circuits on the DC bus; see figure 2 , the method includes:

[0037] Step 101: Judging whether the photovoltaic inverter is in the MPPT centralized mode, when the photovoltaic inverter is in the MPPT centralized mode, enter step 102, otherwise execute step 101 again;

[0038]Step 102: Perform MPPT control on each photovoltaic cell in the photovoltaic module separately to obtain the maximum power point of each photovoltaic cell, wherein the photovoltaic module is directly connected in parallel to the ...

Embodiment 2

[0053] Based on Embodiment 1, Embodiment 2 of the present invention discloses another MPPT centralized mode exit method applied to photovoltaic inverters, so as to achieve both high conversion efficiency and high MPPT efficiency of the photovoltaic inverter. The improvement of Example 2 compared with Embodiment 1 is that, before performing step 102, it also includes: judging whether the DC bus voltage meets the inverter requirements, and only when it is judged that the DC bus voltage meets the inverter requirements, Go to step 102, otherwise directly exit the MPPT centralized mode; to prevent the photovoltaic inverter from running under conditions that do not meet the requirements for entering the MPPT centralized mode.

[0054] Wherein, judging whether the DC bus voltage meets the inverter requirements can be obtained by judging whether the DC bus voltage is higher than the minimum working voltage of the inverter circuit; if the DC bus voltage is lower than the minimum working...

Embodiment 3

[0056] Embodiment 3 of the present invention discloses an MPPT centralized mode switching method applied to photovoltaic inverters, so as to achieve both high overall conversion efficiency and high MPPT efficiency of the photovoltaic inverter, the method includes an MPPT centralized mode entry method And any one of the above MPPT centralized mode exit methods;

[0057] Among them, see Figure 5 , the MPPT centralized mode entry method includes:

[0058] Step 101: Obtain the maximum power point of each photovoltaic cell connected to the multi-channel DC chopper circuit of the photovoltaic inverter;

[0059] Step 102: Determine the reference value in the maximum power point according to the type of the multi-channel DC chopper circuit, and interrupt the operation of the DC chopper circuit connected to the photovoltaic cell corresponding to the reference value;

[0060] When the multi-channel DC chopper circuit is a step-up chopper circuit, then the reference value is the maxim...

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Abstract

The invention discloses an MPPT centralized mode exit method, which is applied to a photovoltaic inverter including multiple DC chopper circuits and one inverter circuit. The method includes: when the photovoltaic inverter is in the MPPT centralized mode, Each path of photovoltaic cells in the photovoltaic module is individually controlled by MPPT to obtain the maximum power point of each path of photovoltaic cells; according to the type of the multi-path DC chopper circuit, determine the maximum power point of each path of photovoltaic cells the standard value; determine whether the voltage difference between the rest of the maximum power point and the standard value exceeds the allowable voltage difference, and restore the DC chopper circuit connected to several photovoltaic cells whose operating voltage difference exceeds the allowable voltage difference, so as to Taking into account the high conversion efficiency and high MPPT efficiency of the photovoltaic inverter. In addition, the invention also discloses an MPPT centralized mode switching method and related applications.

Description

technical field [0001] The present invention relates to the technical field of photovoltaic power generation, and more specifically, to an MPPT centralized mode exit and switching method and related applications. Background technique [0002] Photovoltaic inverter is an energy conversion device in a photovoltaic power generation system, which is used to convert the direct current generated by photovoltaic cells into alternating current and then send it to the grid. The topology of most small and medium power photovoltaic inverters is as follows figure 1 As shown, it includes one inverter circuit and multiple parallel DC chopper circuits, multiple photovoltaic cells are connected to the DC bus through the multiple DC chopper circuits, and then output by one inverter circuit. [0003] When the bus voltage meets the inverter requirements, the inverter control system will control several DC chopper circuits with lower transformer voltage to stop working, so that the photovoltai...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02J3/38H02S40/32
CPCG05F1/67H02J2300/26H02J3/381Y02E10/56H02J3/38H02M7/44
Inventor 张凤岗倪华郑群张彦虎胡兵
Owner SUNGROW POWER SUPPLY CO LTD
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