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Low-voltage ride-through control system and control method for high-power direct-drive permanent magnet wind power generation system

A wind power generation system, low-voltage ride-through technology, applied in wind power generation, AC network voltage regulation, electrical components, etc., can solve the problems of unbalanced input and output power, the threat of insulating gate transistor capacitance, and DC side voltage rise, etc. Beneficial for quick recovery

Active Publication Date: 2018-09-18
ZHENJIANG EAST CHINA ELECTRIC POWER EQUIP FACTORY CO LTD
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  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

When the grid voltage drops, the output voltage of the direct-drive permanent magnet wind power generation system drops. At this time, the output current must be increased to maintain the balance between the power absorbed by the converter from the wind turbine and the output power to the grid. When the drop is large, the input and output power are unbalanced, causing the voltage on the DC side to rise, which poses a threat to the insulated gate transistor (IGBT) and capacitor of the main circuit of the converter

Method used

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  • Low-voltage ride-through control system and control method for high-power direct-drive permanent magnet wind power generation system
  • Low-voltage ride-through control system and control method for high-power direct-drive permanent magnet wind power generation system

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Embodiment Construction

[0011] Such as figure 1 As shown, the low-voltage ride-through control system of the high-power direct-drive permanent magnet wind power generation system includes a full-power converter 1 composed of a machine-side converter and a grid-side converter located between the wind generator and the grid. A crowbar circuit 2 is connected to the DC bus of the full power converter. The system also includes a control module capable of controlling the working state of the crowbar circuit and the full power converter, and the signal input terminal of the control module is connected with a voltage drop detection device capable of detecting grid voltage drop. The control module controls the working mode of the grid-side converter and the input or cut-out of the crowbar circuit according to the detection signal of the voltage drop detection device.

[0012] During the working process of the system of the present invention, the control module collects and detects the signal of the voltage d...

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Abstract

The invention belongs to a wind power generation technology, and relates to a system and a method for controlling low voltage ride through of a high-power direct-driven permanent magnet wind power generation system. The system comprises a full power converter which is positioned between a wind power generator and a power grid and consists of a machine side converter and a grid side converter, and a Crowbar circuit is connected onto a direct current bus of the full power converter. According to the system and the method, protection for the converter can be realized well when the voltage of the direct-driven permanent magnet wind power generation system drops in the power grid, and the low voltage ride through can be realized well through the cooperation with a converter system.

Description

technical field [0001] The invention belongs to wind power generation technology, and relates to a low-voltage ride-through control system and a control method of a high-power direct-drive permanent magnet wind power generation system. Background technique [0002] As a new energy industry, wind power has developed rapidly in recent years, and its installed capacity has continued to increase. With the continuous increase of installed capacity of wind power, it has become a mandatory requirement for wind power generators to have "low voltage ride through function". As the core component of wind power generators, converters must have this function. According to the basic principle of the wind power generation system, during the voltage drop, the system will generate large current and high voltage, so a protection device must be designed in the converter system to prevent damage to the converter. [0003] Compared with doubly-fed motors, permanent magnet direct-drive fans are ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02J3/38H02J3/16
CPCH02J3/001H02J3/16H02J3/386Y02E10/76Y02E40/30
Inventor 汪龙生付军涂永飞李鹏
Owner ZHENJIANG EAST CHINA ELECTRIC POWER EQUIP FACTORY CO LTD
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