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Method for reducing overvoltage of filter in wind driven generator side

A technology for wind turbines and wind power systems, applied in wind energy generation, control of generators, electrical components, etc., can solve the problem of high voltage on the motor side

Pending Publication Date: 2021-09-10
SHIDAI ELECTRIC FACTORY ZHUZHOU ELECTRIC LOCOMOTIVES INST MIN OF RAILWAYS
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The technical problem to be solved by the present invention is to provide a method that can effectively solve the problem of excessive voltage on the motor side caused by the long cable transmission line of the wind power generation system, and at the same time reduce the overvoltage of the wind power generator side filter with higher cost performance

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  • Method for reducing overvoltage of filter in wind driven generator side
  • Method for reducing overvoltage of filter in wind driven generator side

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Embodiment Construction

[0014] The present invention will be described in further detail below in conjunction with the accompanying drawings.

[0015] combined with figure 2 , a method for reducing the overvoltage of the wind generator side filter, that is, adding a Y capacitor to the positive and negative busbars of the DC side of the converter connected to the generator in the wind power generation system, and one end of the Y capacitor It is connected to the busbar and the other end is grounded; at the same time, an LCR filter is set between the machine side of the converter and the long cable of the wind turbine; the overvoltage on the motor side of the wind power generation system is reduced by combining the structure of the Y capacitor and the LCR filter .

[0016] As an improvement, a damping resistor is connected in series after each Y capacitor. The damping resistor can effectively reduce the leakage current of the system to the ground and the circulating current of the system, and furthe...

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Abstract

The invention discloses a method for reducing overvoltage of a filter in a wind driven generator side, which can effectively solve the problem of overhigh voltage on a motor side caused by a long cable transmission line of a wind power generation system and is higher in cost performance. Namely, a positive bus and a negative bus in the direct current side of a converter connected with a generator in a wind power generation system are provided with Y capacitors respectively, one end of each Y capacitor is connected with the bus, and the other end of each Y capacitor is grounded; meanwhile, an LCR filter is arranged between the machine side of the converter and a long cable of the wind driven generator; and the overvoltage in the motor side of the wind power generation system is reduced through a structure of combining the Y capacitors with the LCR filter. As an improvement, a damping resistor is connected in series behind each Y capacitor.

Description

technical field [0001] The invention relates to the technical field of wind power generation, in particular to a method for reducing the overvoltage of a wind power generator side filter. Background technique [0002] At present, wind power generation is widely used. In the wind power generation system, the stator side of the permanent magnet synchronous generator is directly connected to the converter, and the power generated by the generator is transmitted to the DC side of the converter through the machine-side converter, and then The power is directly connected to the grid through the grid-side converter, realizing the utilization of clean energy. [0003] During the research process of daily maintenance and system improvement of wind power generation system, the wind power generation system in the prior art has the following problems: that is, the wind power generator is located at the top of the tower of the entire power generation system, and the converter is located ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02M1/32H02M1/14H02P9/10H02P101/15
CPCH02M1/32H02M1/14H02P9/10H02P2101/15Y02E10/76
Inventor 肖宁支永健孙锦林朱柄全曾鸣杨德勇袁科亮
Owner SHIDAI ELECTRIC FACTORY ZHUZHOU ELECTRIC LOCOMOTIVES INST MIN OF RAILWAYS