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High voltage ride-through method of wind power converter

A wind power converter, high voltage technology, applied in wind power generation, single grid parallel feeding arrangement, etc., can solve the problems of grid-connected active power DC bus voltage grid electromotive force imbalance, fluctuation and other problems, achieve good control and suppress fluctuations Effect

Inactive Publication Date: 2014-12-24
STATE GRID CORP OF CHINA +4
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] The purpose of the present invention is to provide a high-voltage ride-through method for wind power converters to solve the problem of grid-connected active power and DC bus voltage fluctuations caused by grid electromotive force imbalance after high-voltage ride-through

Method used

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  • High voltage ride-through method of wind power converter
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  • High voltage ride-through method of wind power converter

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Embodiment Construction

[0020] The present invention will be described in further detail below in conjunction with the accompanying drawings.

[0021] Such as figure 1 as shown, figure 1 It is a system structure diagram of the present invention, the wind power converter includes a grid-side converter GSC, a machine-side converter LSC, a DC bus voltage discharge circuit DBR, and a DC bus voltage discharge circuit DBR includes an IGBT, a DC discharge resistor R, A diode, the diode is connected in reverse parallel with the IGBT and then connected in series with the DC discharge resistor R.

[0022] Real-time monitoring of the grid voltage of the wind turbine generator set, when the detected grid voltage is a set multiple of the rated voltage, here we take 1.1 times as an example. When the detected grid voltage is 1.1 times the rated voltage, the converter enters the high voltage ride-through control state, and the grid-side converter increases the reactive output by changing the reactive current. The ...

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Abstract

The invention relates to a high voltage ride-through method of a wind power converter. The wind power converter comprises a direct-current bus voltage bleeder circuit. The direct-current bus voltage bleeder circuit comprises an IGBT and a direct-current unloading resistor, and the IGBT and the direct-current unloading resistor are connected to the two ends of the converter after being connected in series. When the voltage of a power grid is higher than a set multiple of nominal voltage, the high voltage ride-through state is started, reactive output of a grid side converter is increased, the transient transition process of high voltage ride-through is achieved, and a unit can ride through a fault at the power grid voltage of 1.1 pu to 1.3 pu. Meanwhile, the fluctuation of the active power of the converter can be suppressed through positive and negative sequence current control, the direct-current bus voltage bleeder circuit releases electric energy, and the fluctuation of the active power of grid connection and the direct-current bus voltage caused by unbalance of the electrodynamic potential of the power grid can be effectively suppressed.

Description

technical field [0001] The invention relates to a high-voltage ride-through method for a wind power converter, belonging to the technical field of wind power generation. Background technique [0002] At present, wind power generation systems mainly include constant speed and constant frequency power generation systems and variable speed constant frequency wind power generation systems. Because the constant speed and constant frequency power generation system can only capture wind energy at a certain wind speed, the power generation efficiency is low, and its application is less and less; while the variable speed constant frequency wind power generation system is more and more widely used. Variable-speed constant-frequency wind power generation systems generally use double-fed motors or permanent magnet synchronous motors as generators, and direct-drive fans that use permanent magnet synchronous motors as generators can save the speed-up gearbox of double-fed fans and reduce ...

Claims

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Application Information

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IPC IPC(8): H02J3/38
CPCY02E10/76
Inventor 张建高亚春刘少宇朱斯马步云岳巍澎肖鹏郜亚秋刘刚孙健程林志杨杨史航卢仁宝李松博石磊
Owner STATE GRID CORP OF CHINA
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