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A Multi-Peak MPPT Method for Photovoltaic Inverters Based on Improved Conductance Incremental Method

A technology of photovoltaic inverter and conductance increment method, which is applied in photovoltaic power generation, adjustment of electrical variables, instruments, etc., to achieve the effect of efficient start, improve power generation efficiency, and improve search efficiency

Active Publication Date: 2018-05-15
GUANGZHOU INST OF ENERGY CONVERSION - CHINESE ACAD OF SCI
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  • Abstract
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Problems solved by technology

[0004] The purpose of the present invention is to solve the problem of tracking the global maximum power point of the multi-peak output of the photovoltaic array by the photovoltaic inverter under the shadow, and propose a multi-peak algorithm triggering method to improve the MPPT tracking of the photovoltaic inverter under shadow conditions and no shadow conditions efficiency

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  • A Multi-Peak MPPT Method for Photovoltaic Inverters Based on Improved Conductance Incremental Method
  • A Multi-Peak MPPT Method for Photovoltaic Inverters Based on Improved Conductance Incremental Method
  • A Multi-Peak MPPT Method for Photovoltaic Inverters Based on Improved Conductance Incremental Method

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[0038] The technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings and embodiments. Apparently, the described embodiments are only some of the embodiments of the present invention, not all of them.

[0039] see Figure 3 to Figure 5 , the method of the present invention can be used in single-stage and dual-stage grid-connected inverters. Here, a dual-stage grid-connected inverter is taken as an example for illustration. The structure of a photovoltaic system using a dual-stage grid-connected inverter is as follows image 3 shown. Figure 4 with Figure 5 They are the step diagram and flow chart of the method of the present invention respectively; the present invention mainly aims at the multi-peak curve of photovoltaic array under the shadow due to the mismatch of the output characteristics of each series photovoltaic module, adopting the shadow real-time monitoring and judging steps to re...

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Abstract

The invention discloses an improved conductance increment method based photovoltaic inverter multiple peak value MPPT (Maximum Power Point Tracking). Photovoltaic array information is used as an inverter control parameter, real-time monitoring of a shadow is achieved, and shadow change can be accurately and effectively determined; a segment fixed step size conductance increment method is used as a global maximum power point scanning algorithm to perform maximum power primary scanning, and the segment fixed step size conductance increment method is used to perform accurate tracking on a global maximum power after primary scanning is completed. The method has high power fluctuation sensitivity, can eliminate sun irradiation fluctuation without in the absence of a shadow, can avoid triggering of power fluctuation for the global maximum power point scanning algorithm in the absence of a shadow, can improve the scanning efficiency, can rapidly, stably and accurately achieve MPPT of a shadow, and can improve the MPPT efficiency in the presence of a shadow.

Description

technical field [0001] The invention relates to the field of photovoltaic power generation systems, in particular to a multi-peak MPPT method for photovoltaic inverters based on the improved conductance incremental method. Background technique [0002] Maximum power point tracking (Maximum Power Point Tracking, referred to as MPPT) control is a DC / DC or DC / AC converter control method to make photovoltaic modules work at the maximum power point, so that the output power of the photovoltaic array is maximized to ensure that the photovoltaic power generation system has higher efficiency. In the case of uniform solar irradiation and temperature, photovoltaic modules exist such as figure 1 As shown in the P-V (power-voltage) characteristic curve, the photovoltaic array composed of photovoltaic modules connected in series and parallel also has the same output characteristic curve. In the case of no shading, the maximum tracking efficiency of the photovoltaic inverter can reach 9...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G05F1/67
CPCG05F1/67Y02E10/56
Inventor 黄磊舒杰王浩吴志锋张继元崔琼
Owner GUANGZHOU INST OF ENERGY CONVERSION - CHINESE ACAD OF SCI
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