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MPPT tracking method for inverter, storage medium and computing equipment

A technology of computing equipment and inverters, applied in the direction of instruments, adjusting electric variables, control/regulation systems, etc., can solve problems such as slow dynamic response speed, DC side undervoltage, slow power tracking speed, etc., to achieve simple engineering implementation, The algorithm logic is clear and easy to promote and apply

Inactive Publication Date: 2021-01-22
XIAN THERMAL POWER RES INST CO LTD
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] (1) If the step size ΔV of MPPT tracking is too large, the power fluctuation at the maximum power point will be large, resulting in a certain power loss
[0006] (2) If the step size ΔV of MPPT tracking is too small, on the one hand, the power tracking speed will be too slow; Faults such as DC side undervoltage
And because the step size is too small, the two power deviations before and after are small, which may cause calculation deviations when the power fluctuates, resulting in wrong tracking directions, which further affects the speed of tracking to the maximum power point

Method used

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  • MPPT tracking method for inverter, storage medium and computing equipment

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Embodiment Construction

[0029] see figure 1 , a MPPT tracking method for an inverter of the present invention, the photovoltaic cell panel has the characteristics that the open circuit voltage Uoc of the photovoltaic cell panel varies within 30V during normal operation in one day, and the maximum power point is 0.78~0.8Uoc; the specific steps are as follows:

[0030] S1. Power on the inverter, detect the current open circuit voltage value Uoc, and start the grid-connected operation of the inverter;

[0031] When the DC bus voltage Vref is greater than 0.85Uoc, the PI control loop of the voltage outer loop is disconnected, and the given value X of the current loop is directly controlled. The given value X starts to increase rapidly from 0, and increases △X every interrupt cycle (each interrupt The period is only 333us), at this time the power rises rapidly, and the DC bus voltage Vref rapidly decreases to near the maximum power point voltage.

[0032] S2. When the DC bus voltage Vref is reduced below...

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Abstract

The invention discloses an MPPT tracking method for an inverter, a storage medium and computing equipment, and the method comprises the steps: enabling the inverter to be powered on, detecting a current open-circuit voltage value Uoc, and enabling the inverter to start grid-connected operation; when the direct-current bus voltage Vref is reduced to 0.85Uoc or below, high-precision MPPT tracking isconducted through an MPPT small-step-length algorithm; when it is detected that the direct-current bus voltage Vref is smaller than 0.7Uoc, the inverter works in an abnormal state, and after the direct-current bus voltage Vref is recovered to 0.7Uoc or above, tracking is conducted at the maximum power point again. The method achieves the purpose of stable and quick tracking of the MPPT of the inverter, is clear in logic, is simple in engineering implementation, and is convenient for popularization and application.

Description

technical field [0001] The invention belongs to the technical field of inverter control, and in particular relates to an MPPT tracking method for an inverter, a storage medium and a computing device. Background technique [0002] MPPT (Maximum Power Point Tracking) tracking technology is to track and control the changes in output voltage and current caused by changes in solar cell surface temperature and solar irradiance, so that the array can always be kept in the working state of maximum output. The adjustment behavior to obtain the maximum power output is called maximum power point tracking (MPPT tracking technology). Because solar cells are affected by external factors such as light intensity and the environment, their output power changes, and the light intensity generates more electricity. The inverter with MPPT maximum power tracking is to make full use of solar cells and make them run at the maximum power point. That is to say, under the condition of constant solar...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G05F1/67
CPCG05F1/67
Inventor 张瑞刚吴琼杨博谢小军郗航姚伟刚李太江
Owner XIAN THERMAL POWER RES INST CO LTD
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