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Photovoltaic inversion controller's parameter identification method based on fuzzy C mean value and differential evolution hybrid algorithm

A photovoltaic inverter, differential evolution technology, applied in photovoltaic power generation, single-grid parallel feeding arrangement, AC network circuit, etc., can solve the problem of slow algorithm convergence speed and so on

Active Publication Date: 2017-07-28
HEFEI UNIV OF TECH +1
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Problems solved by technology

The differential evolution algorithm has been widely used in the field of parameter identification of complex systems due to its simple algorithm, strong robustness and powerful global search ability, but an obvious shortcoming of the algorithm is that the convergence speed of the algorithm is slow in the late iteration

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  • Photovoltaic inversion controller's parameter identification method based on fuzzy C mean value and differential evolution hybrid algorithm
  • Photovoltaic inversion controller's parameter identification method based on fuzzy C mean value and differential evolution hybrid algorithm
  • Photovoltaic inversion controller's parameter identification method based on fuzzy C mean value and differential evolution hybrid algorithm

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Embodiment Construction

[0065] In this embodiment, the structure of the photovoltaic inverter and the photovoltaic inverter controller is as follows: figure 1 As shown, the photovoltaic inverter is controlled by the photovoltaic inverter controller. The photovoltaic inverter controller adopts the common voltage outer loop and current inner loop control strategy. The control strategy includes 5 control parameters in total, which are: voltage outer loop Ring proportionality coefficient k pu , voltage outer loop integral coefficient k iu , current inner loop proportional coefficient k pi , current inner loop integral coefficient k ii , filter inductance L s ;Will figure 1 The reactive current reference value in the PV inverter controller is set to 0, i qref = 0, the unit power factor of the photovoltaic inverter can be connected to the grid.

[0066] Such as figure 2 As shown, the PV inverter controller parameter identification method based on fuzzy C-means and differential evolution hybrid algo...

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Abstract

The invention discloses a photovoltaic inversion controller's parameter identification method based on the fuzzy C mean value and the differential evolution hybrid algorithm. The method comprises: 1) setting the three-phase short-circuit fault disturbance at the grid connection point of the photovoltaic inverter; and sampling the active power output of the photovoltaic inverter; 2) identifying all control parameters of the photovoltaic inverter through the use of the fuzzy C mean value and the differential evolution hybrid algorithm wherein the identification results of the voltage outer ring proportional coefficient, the voltage outer ring integral coefficient, and the current inner ring proportional coefficient are the final results of the parameters; 3) setting the photovoltaic direct current voltage reference value sudden disturbance and sampling the active power output of the photovoltaic inverter again; and 4) through the use of the fuzzy C mean value and the differential evolution hybrid algorithm, identifying the current inner ring proportional coefficient and the filter inductance parameters. The method of the invention is able to obtain the parameter values of a photovoltaic inversion controller quickly and accurately so that the simulated dynamic response curve of the photovoltaic inversion controller is consistent with the actually measured dynamic response curve.

Description

technical field [0001] The invention relates to the technical field of power system analysis, and more specifically, the invention relates to a parameter identification method of a photovoltaic inverter controller. Background technique [0002] In recent years, with the increasingly serious energy crisis and environmental pollution, photovoltaic power generation has attracted more and more attention because of its clean and renewable characteristics, and is in the stage of rapid development and large-scale application. Photovoltaic inverter is the core device to realize photovoltaic system grid-connected, and plays a decisive role in the grid-connected transient characteristics of photovoltaic system. Accurately obtaining the parameters of photovoltaic inverter controller is of great importance for the stability analysis and fault protection of photovoltaic grid-connected. is of great significance. At present, most of the parameters of photovoltaic inverter controllers are ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02J3/38
CPCH02J3/383H02J2203/20Y02E10/56
Inventor 吴红斌刘众前王刘芳齐先军徐斌丁津津骆晨李伟陈洪波
Owner HEFEI UNIV OF TECH
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