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Novel grid-connected photovoltaic power generation control method

A control method and photovoltaic cell technology, applied in photovoltaic power generation, single-network parallel feeding arrangement, etc., can solve problems such as unsatisfactory control effects, achieve enhanced operational reliability and safety, simple design steps, and strong anti-interference ability Effect

Inactive Publication Date: 2014-02-26
SHANGHAI UNIVERSITY OF ELECTRIC POWER
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  • Abstract
  • Description
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  • Application Information

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Problems solved by technology

However, the control effect of the current control methods is not satisfactory.

Method used

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Embodiment Construction

[0019] The invention uses the active disturbance rejection control technology to design the photovoltaic grid-connected power generation controller, realizes the power balance tracking control in the photovoltaic grid-connected power generation mode, and adjusts the frequency and voltage without difference, ensuring the stability of the regional photovoltaic grid-connected power generation system run.

[0020] Technical scheme of the present invention is as follows:

[0021] (1) Construct the second-order linear active disturbance rejection controller:

[0022] Aiming at the complexity of ADRC parameter tuning, a linear ADRC controller is proposed. Let a class of uncertain objects be ,in, is the input, y is the output, d is a constant coefficient, w for external disturbances. yes y derivative of .

[0023] To add external disturbances to the system dynamic model, it can be changed to:

[0024]

[0025] Construct a state-space model:

[0026]

[0027] in, ,...

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Abstract

The invention relates to a novel grid-connected photovoltaic power generation control method. Control refers to a power control link and a double-loop control link. In the power control link, the frequency and a reference signal of the voltage amplitude of a grid system are acquired according to drooping characteristics, the set drooping characteristics are automatically tracked through a PI controller, and then the purpose of controlling active power and reactive power to be output is achieved based on double-ring control of the active-disturbance-rejection technology. According to the grid-connected photovoltaic power generation control method based on the active-disturbance-rejection technology, designed steps are simple, an active-disturbance-rejection structure is strong in disturbance resistance ability, balance tracking of power under photovoltaic grid connected modes can be achieved, no-difference adjusting of the frequency and the voltage amplitude can be achieved, and operation reliability and safety of a photovoltaic grid-connected system are improved. The control method has general significance, is wide in application range and provides a new concept for controlling complex nonlinear controlled objects.

Description

technical field [0001] The invention relates to a micro-grid control technology, in particular to a novel photovoltaic grid-connected power generation control method. Background technique [0002] Photovoltaic power generation (PVG) grid-connected technology is a research hotspot at home and abroad. Grid-connected operation of PVG system can improve the reliability of grid power supply, reduce peak-valley difference and system backup, etc. [0003] In the photovoltaic grid-connected power generation system, the tracking control of the grid is directly related to the output power quality and the operating efficiency of the system, and is the core and technical key of the system. However, since photovoltaic power generation is affected by uncertain factors such as weather and light, its output power has the characteristics of volatility and discontinuity. Energy storage devices can be added to the photovoltaic power generation system to reasonably adjust the output power of ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02J3/38
CPCY02E10/563Y02E10/56
Inventor 朱昊韦钢翟春荣
Owner SHANGHAI UNIVERSITY OF ELECTRIC POWER
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