A photovoltaic grid-connected inverter system based on grid-connected control algorithm

An inverter system and control algorithm technology, which is applied in photovoltaic power generation, single grid parallel feeding arrangement, multiphase network asymmetry reduction, etc. Problems such as calculation and delay, to achieve the effect of improving dynamic and fast response performance, reducing impact, and improving accurate performance

Active Publication Date: 2016-01-13
DONGFANG ELECTRIC AUTOMATIC CONTROL ENG CO LTD
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the feedback of the secondary pulsation interference in the above-mentioned patents is obtained through filtering, calculation, and sampling, and the complicated calculation and delay brought by the filtering and calculation links will affect the control accuracy and dynamic response speed of the entire system, making the elimination of The effect of secondary pulsation interference cannot meet expectations

Method used

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  • A photovoltaic grid-connected inverter system based on grid-connected control algorithm
  • A photovoltaic grid-connected inverter system based on grid-connected control algorithm
  • A photovoltaic grid-connected inverter system based on grid-connected control algorithm

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Embodiment 1

[0031] A photovoltaic grid-connected inverter system based on grid-connected control algorithm, which is characterized by: including photovoltaic array module, DC / DC module, inverter full bridge module, filter switching circuit module, sampling module, DSP controller module and power frequency Isolation transformer module;

[0032] The photovoltaic array module is connected with the DC / DC module, the DC / DC module is connected with the inverter full bridge module, the inverter full bridge module is connected with the filter switching circuit module, the filter switching circuit module is connected with the power frequency isolation transformer module, and the DC / DC module is connected with the inverter full bridge module. The DC module and the power frequency isolation transformer module are connected with the DSP controller module through the sampling module, and the DSP controller module is respectively connected with the inverter full bridge module and the DC / DC module;

[0033] ...

Embodiment 2

[0045] A photovoltaic grid-connected inverter system based on grid-connected control algorithm, which is characterized by: including photovoltaic array module, DC / DC module, inverter full bridge module, filter switching circuit module, sampling module, DSP controller module and power frequency Isolation transformer module; the photovoltaic array module is connected with the DC / DC module, the DC / DC module is connected with the inverter full bridge module, the inverter full bridge module is connected with the filter switching circuit module, and the filter switching circuit module is connected with the power frequency isolation transformer module, The DC / DC module and the power frequency isolation transformer module are connected with the DSP controller module through the sampling module, and the DSP controller module is respectively connected with the inverter full bridge module and the DC / DC module; the photovoltaic array module converts the collected solar energy into DC power ...

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Abstract

The invention relates to the technical field of photovoltaic grid-tied inverter control, in particular to a photovoltaic grid-tied inversion system based on novel grid-tied control algorithm. The photovoltaic grid-tied inversion system based on the novel grid-tied control algorithm comprises a photovoltaic array module, a direct current (DC) / DC module, an inversion full-bridge module, a filter switch circuit module, a sampling module, a digital signal processor (DSP) controller module and a power frequency isolation transformer module. The photovoltaic grid-tied inversion system based on the novel grid-tied control algorithm has the advantages that a double-closed-loop control strategy is adopted by the inversion full-bridge module, proportion integral resonance (PIR) controllers are adopted by a DC bus voltage control outer ring and a grid-tied current control inner ring, a space vector pulse width modulation (SVPWM) technology is adopted by an inversion full-bridge circuit, the DC / DC module is adopted to achieve maximum power point tracking (MPPT) of the photovoltaic grid-tied inversion system, a power frequency isolation transformer is adopted to isolate DC components, and influence of the grid-tied inversion system on power grid electricity equipment is reduced.

Description

Technical field [0001] The invention belongs to the technical field of photovoltaic grid-connected inverter control, and specifically relates to a photovoltaic grid-connected inverter system based on a grid-connected control algorithm. Background technique [0002] In today's increasingly scarce energy and serious environmental pollution, the use of solar energy has been paid more attention, and photovoltaic grid-connected power generation has therefore achieved unprecedented development. Grid-connected inverter (including Boost boost circuit, inverter full-bridge circuit, DSP controller and sampling circuit) is the most critical component of photovoltaic power generation system as the interface device between photovoltaic power generation system and power grid, and its control technology has become the current research One of the hot spots. At present, SPWM inverter technology is widely used in photovoltaic grid-connected inverters. Although this solution can meet the requirem...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02J3/38H02J1/02H02J3/26
CPCY02E10/56Y02E40/50
Inventor 李华银赵昕彭涛闵泽生陈建国蒋弛雷杜睿徐其惠石方舟徐纯科陈明田绍据
Owner DONGFANG ELECTRIC AUTOMATIC CONTROL ENG CO LTD
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