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Control method of grid-side converter of permanent magnetic direct drive type wind turbine system during low voltage ride through

A technology of wind power generation system and grid-side converter, which is applied in wind power generation, single-network parallel feeding arrangement, sustainable building, etc., can solve the problem of PI controller saturation and out-of-control, and achieve the goal of improving performance and meeting control requirements Effect

Active Publication Date: 2013-03-27
NORTH CHINA ELECTRIC POWER UNIV (BAODING)
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Due to the saturation characteristics of PI control itself, in the severe dynamic process of low voltage ride through of the system, some PI controllers tend to be saturated and out of control, which will bring adverse effects to the control system

Method used

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  • Control method of grid-side converter of permanent magnetic direct drive type wind turbine system during low voltage ride through
  • Control method of grid-side converter of permanent magnetic direct drive type wind turbine system during low voltage ride through
  • Control method of grid-side converter of permanent magnetic direct drive type wind turbine system during low voltage ride through

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Embodiment Construction

[0021] The technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only some of the embodiments of the present invention, not all of them. Based on the embodiments of the present invention, all other embodiments obtained by persons of ordinary skill in the art without making creative efforts belong to the protection scope of the present invention.

[0022] Embodiments of the present invention will be further described in detail below in conjunction with the accompanying drawings, as figure 1 Shown is a schematic flowchart of a control method for a grid-side converter during low-voltage ride-through of a permanent magnet direct-drive wind power generation system provided by an embodiment of the present invention, and the method includes:

[0023] Step 11: Establish a mathematical model of the p...

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Abstract

The invention discloses a control method of a grid-side converter of a permanent magnetic direct drive type wind turbine system during low voltage ride through. The method comprises building a mathematical model of the permanent magnetic direct drive type wind turbine system through a transfer function of the permanent magnetic direct drive type wind turbine system, making a control strategy of the grid-side converter of the permanent magnetic direct drive type wind turbine system during low voltage ride through; building the mathematical model of the grid-side converter in a real-time digital simulator (RTDS) of an electrical power system; using the built mathematical model of the grid-side converter to simulate and contrast control results of the control strategy in the permanent magnetic direct drive type wind turbine system during low voltage ride through and checking effectiveness of the control strategy. The control method can analyze, simulate and check an PI control ring which is not favorable for low voltage ride through of the system, improves the control strategy, accordingly meets control requirements for the low voltage ride through of the system, and improves performance of the permanent magnetic direct drive type wind turbine system.

Description

technical field [0001] The invention relates to the technical field of wind power generation systems, in particular to a control method for a grid-side converter during low-voltage ride-through of a permanent magnet direct-drive wind power generation system. Background technique [0002] With the increase of grid-connected wind farm capacity, the impact of wind power generation system on the grid can no longer be ignored. In a conventional wind power generation system, when the grid voltage drops to a certain value, the wind turbine will automatically disconnect from the grid. This situation is acceptable in a grid where the proportion of wind power generation is not high; In the power system, the off-grid of wind power generators will cause the collapse of grid voltage and frequency, which will bring huge losses to industrial production, thus making it difficult for large-scale application of wind power generation. In order to keep wind turbines connected to the grid even ...

Claims

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Application Information

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IPC IPC(8): H02J3/38
CPCY02E10/763Y02B10/30Y02E10/76
Inventor 毕天姝薛安成陈进美杨奇逊
Owner NORTH CHINA ELECTRIC POWER UNIV (BAODING)
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