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Grid-connection control method for solar photovoltaic power generation

A technology of solar photovoltaic and solar energy, applied in the field of solar photovoltaic power generation, can solve the problems of few research results and practical methods, and achieve the effect of reducing the probability of misjudgment and misoperation

Inactive Publication Date: 2010-09-22
孔小明 +2
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although many patent documents have proposed many solutions to the maximum power control problem, and the grid-connected technology is also a very mature technology, but the effective combination of the two is applied to the solar photovoltaic power generation system. And there are still relatively few practical methods

Method used

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  • Grid-connection control method for solar photovoltaic power generation
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  • Grid-connection control method for solar photovoltaic power generation

Examples

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Effect test

Embodiment 1

[0026] (2) Embodiment 1: When implementing the MPPT algorithm and implementing grid-connected control, the present invention detects the output voltage and the current of the solar panel 1 with the microprocessor 6, and executes the MPPT algorithm to regulate the output current of the solar panel 1, that is The input current of the DC / DC converter 2 (hereinafter simply referred to as the output current of the solar cell panel 1 ) keeps the output power of the solar cell panel 1 at the maximum value under the current light intensity. On the other hand, the microprocessor 6 detects the grid voltage and the inverter output current to implement the grid-connected control of the inverter 3, detects the DC bus voltage at the same time, and executes the DC bus constant voltage control algorithm to adjust the paralleling of the inverter 3. The magnitude of the output current of the network, in order to achieve the purpose of controlling the DC bus voltage to a pre-specified voltage val...

Embodiment 2

[0027] (3) Embodiment 2: When implementing the MPPT algorithm and implementing grid-connected control, the present invention detects grid voltage and inverter output current with microprocessor 6 to implement grid-connected control, and microprocessor 6 detects solar panel 1 simultaneously The output voltage and current of the inverter 3 are executed, and the MPPT algorithm is executed to adjust the output current of the inverter 3 during grid-connected control. On the other hand, the microprocessor 6 detects the DC bus voltage, executes the DC bus constant voltage control algorithm, and controls the DC bus voltage to a predetermined voltage value by adjusting the output current of the solar panel 1 .

[0028] (4) The general idea of ​​Embodiment 1 is that, from the perspective of the DC / DC converter 2, the function of the inverter 3 is first defined as a DC voltage source connected in parallel with the power grid. The task of this DC voltage source is to keep the DC voltage o...

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Abstract

The invention discloses a grid-connection control method for solar photovoltaic power generation and belongs to the field of solar photovoltaic power generation. The method is characterized in that: constant voltage control of a direct-current bus is taken as a basic starting point and the output voltage and current of a photovoltaic cell are adjusted by adjusting the pulse-width modulation (PWM) duty ratio of a DC / DC converter so as to realize the tracking control of the maximum output power point of the photovoltaic cell; and in addition, stable and grid-connection running of a photovoltaic generating system is realized and the constant voltage of the direct-current bus is maintained by adjusting the output current of a DC / AC grid-connected inverter. The tracking control of the maximum power point of the photovoltaic cell is characterized in that: the variation track of a power-voltage vector is obtained by sampling the output voltage and current of the photovoltaic cell at three or more points and is matched with a preset variation mode so as to determine the adjusting direction of the output current. During grid-connection running, the PWM duty ratio of the inverter is adjusted by using the measured voltage amplitude, phase position and frequency information of a power grid so as to synchronize the voltage generated by the system and the power grid. Moreover, the voltage of the direct-current bus is kept constant by using high-speed feedback of the output current of the inverter, so that the power of the system fed in the power grid is close to the power generated by a solar cell to the maximum.

Description

technical field [0001] The invention belongs to the field of solar photovoltaic power generation, and in particular relates to a method for controlling grid-connected power generation at the maximum power point of a solar photovoltaic battery panel. Background technique [0002] As one of the main ways of the new energy revolution in the 21st century, solar power generation is receiving increasing attention. Independent solar power generation systems and megawatt-level solar grid-connected power generation have begun to move from laboratories to practical applications. Easing our reliance on traditional fossil energy generation and nuclear power generation in a larger sense is playing an increasing role. [0003] The key equipment for solar power generation is solar photovoltaic panels. Photovoltaic cells convert the absorbed sunlight energy into DC power. Many photovoltaic cells are connected in series and parallel to form a panel, and then these panels are connected in ser...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02J3/38H02N6/00
CPCY02E10/563Y02E10/56
Inventor 孔小明姜松芳戴政
Owner 孔小明
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