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Parameter identification method for grid-connected photovoltaic power generation system based on transient disturbance

A photovoltaic power generation system and transient disturbance technology, applied in the field of parameter identification, can solve problems such as the influence of large power grid stability, low voltage ride through, and grid-connected harmonics, and achieve the effect of solving inaccurate identification

Pending Publication Date: 2020-02-21
STATE GRID GASU ELECTRIC POWER RES INST +2
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Problems solved by technology

However, grid-connected photovoltaic power generation system will bring a series of problems, such as low voltage ride-through problem, grid-connected harmonic problem, large-scale grid-connected impact on the stability of traditional large power grid, etc., and accurate grid-connected photovoltaic power generation system model and Grid-connected photovoltaic inverter control parameters are the basis for researching and solving such problems

Method used

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  • Parameter identification method for grid-connected photovoltaic power generation system based on transient disturbance
  • Parameter identification method for grid-connected photovoltaic power generation system based on transient disturbance
  • Parameter identification method for grid-connected photovoltaic power generation system based on transient disturbance

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Embodiment

[0058] The following takes the sudden change of photovoltaic intensity and sudden change of temperature as an example. When the model built in this paper is in stable operation, the photovoltaic array and DC-DC converter reach the maximum power point under the control of Mppt. At this time, the voltage, U-dc. = 501V, and the power P = 10.42KW. The control parameter of the inverter is k PId =k PIq =20,k IId =k IIq =1000,k PUd =k PUd =0.1,k IUq =k IUq =10, L=23mH. Artificially set disturbance sunlight intensity from 1000W / m 2 down to 800W / m 2 To obtain the disturbance data Id, Iq curve, that is, the reference current curve. The q-axis parameters are fixed, and the improved GPSO algorithm is used to identify the control parameters of the d-axis in the grid-connected photovoltaic inverter in the case of sudden changes in sunlight intensity. The identification results are shown in Table 1.

[0059] Table 1

[0060]

[0061] On the contrary, the control parameters of ...

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Abstract

The invention discloses a parameter identification method for a grid-connected photovoltaic power generation system based on transient disturbance. The grid-connected photovoltaic power generation system comprises a photovoltaic array, a DC / DC converter, an inverter controlled by a VSC, an inverter, an inverter controller, and a filter circuit. The filter circuit is connected with a power grid. The DC / DC converter is connected with a maximum power controller. The inverter is connected with the inverter controller. The method is based on an improved genetic algorithm-particle swarm optimization(GA-PSO). By analyzing current changes under different transient disturbances, optimal identification of inverter parameters is achieved. The problem that a traditional mathematical analysis method is inaccurate in identification of the inverter parameters is solved, and a foundation is provided for research on inverter control optimization, low voltage ride-through, power grid power flow optimization and the like.

Description

technical field [0001] The invention belongs to the technical field of parameter identification, and in particular relates to a method for identifying parameters of a grid-connected photovoltaic power generation system based on transient disturbances. Background technique [0002] Photovoltaic power generation, as one of the main clean energy sources in my country at present, has the advantages of wide distribution, high flexibility, and obvious effects of energy saving and emission reduction. In 2015, the National Energy Administration pointed out that the photovoltaic power generation capacity will exceed 100GW in 2020. Therefore, photovoltaic power generation has been in the stage of rapid development and large-scale application, and large-scale photovoltaic power generation grid connection is an inevitable trend of photovoltaic development. However, grid-connected photovoltaic power generation system will bring a series of problems, such as low voltage ride-through prob...

Claims

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Application Information

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IPC IPC(8): H02J3/38
CPCY02E10/56
Inventor 马喜平胡殿刚董开松沈渭程李树林刘克权张伟徐宏雷刘丽娟赵炜张光儒魏博梁有珍赵耀杨俊闵占奎刘秀良李志敏陈明忠同焕珍张赛甄文喜朱宏毅郑翔宇陈柏旭周政龙魏润芝赵霖党建
Owner STATE GRID GASU ELECTRIC POWER RES INST
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