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Maximal power point tracking control method for single-phase single-stage photovoltaic inverter

A maximum power point, photovoltaic inverter technology, applied in photovoltaic power generation, photovoltaic modules, output power conversion devices, etc., can solve problems such as optimal control of the DC voltage set value extreme value, and achieve optimal steady-state and dynamic Performance, ease of implementation, and low computational cost

Inactive Publication Date: 2012-09-19
于晶荣
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

From this point of view, the optimization problem of DC voltage setting value is a typical extreme value optimization control problem

Method used

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  • Maximal power point tracking control method for single-phase single-stage photovoltaic inverter
  • Maximal power point tracking control method for single-phase single-stage photovoltaic inverter
  • Maximal power point tracking control method for single-phase single-stage photovoltaic inverter

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Embodiment Construction

[0028] The following will be described in detail in conjunction with the accompanying drawings, but not as a limitation of the present invention.

[0029] (1) Photovoltaic cell characteristic curve

[0030] Under different light intensities and ambient temperatures, the output current-voltage of photovoltaic cells presents nonlinear characteristics, and its current-voltage characteristic equation is

[0031] I PV = I ph - I o ( exp ( q U PV AkT ) - 1 ) - - - ( 1 )

[0032] In the formula, U PV , I PV are the output voltage a...

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Abstract

The invention discloses a maximal power point tracking (MPPT) control method for a single-phase single-stage photovoltaic inverter. The method comprises the steps of: sampling output current and output voltage of a photovoltaic cell, calculating output power of the photovoltaic cell; respectively filtering direct current components of the output voltage and the output power through high-pass filtering to obtain alternating current components of the output voltage and the output power; regarding the alternating current component of the output voltage as disturbance quantity of optimizing control of an extreme value, multiplying the disturbance quantity by the alternating current component of the output power, and then obtaining estimated work voltage of the maximal power output point by low-pass filtering and integration, superposing the disturbance quantity on the estimated work voltage, and repeatedly carrying out the steps to ensure that the photovoltaic cell works near the maximal power output point all the time. According to the maximal power point tracking control method for the single-phase single-stage photovoltaic inverter disclosed by the invention, the inherent quality of the system is sufficiently utilized without additionally injecting a disturbance signal, and the effect of the external disturbance signal on the system is eliminated. In addition, the maximal power point tracking control method for the single-phase single-stage photovoltaic inverter can ensure less calculation of the MPPT control method, thereby facilitating implementation.

Description

technical field [0001] The present invention relates to the field of photovoltaic power generation, in particular to a maximum power point tracking (MPPT, Maximum Power Point tracking) method for a single-phase single-stage photovoltaic inverter. Background technique [0002] In recent years, new energy power generation technologies have developed rapidly, among which photovoltaic power generation is considered to be the most promising renewable energy utilization technology due to its cleanliness and economy. Photovoltaic roofs are considered to be the main form of promotion and popularization of photovoltaic power generation technology in the future. In this type of photovoltaic system, photovoltaic cells are connected to a single-phase grid or supply a load through an inverter. As a key component of the photovoltaic system, the inverter directly affects the overall performance, efficiency and cost of the system. Due to its low cost, high reliability and flexible configu...

Claims

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Application Information

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IPC IPC(8): H02M7/537H02N6/00H02S40/30H02S40/32
CPCY02E10/56
Inventor 于晶荣曹一家陈岗徐勇荣飞
Owner 于晶荣
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