A converter control method for improving the low-voltage ride-through capability of double-fed wind turbines
A low-voltage ride-through, doubly-fed fan technology, applied in the direction of motor generator control, generator control circuit, asynchronous generator control, etc., can solve the problem of failure to guarantee control performance and insufficient consideration of the nonlinearity of the grid-side converter model Characteristics and other issues, to achieve low voltage ride through, best control effect, reduce rotor overcurrent and DC overvoltage effect
Active Publication Date: 2021-11-02
STATE GRID SHAANXI ELECTRIC POWER RES INST +2
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However, these controllers do not fully consider the nonlinear characteristics of the grid-side converter model in practical applications, and cannot guarantee the ideal control performance
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[0112] In order to make the purpose, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly described below in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are the Some, but not all, embodiments are invented. 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.
[0113] The wind power generation system (WGS) in the present invention includes a doubly-fed induction generator (referred to as a doubly-fed fan), a wind turbine, a rotor-side converter, a grid-side converter, an AC filter and an AC system. The purpose of the present invention is to make full use of the control capabilities of the rotor-side and grid-side converters, a...
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A converter control method for improving the low-voltage ride-through capability of double-fed wind turbines. After a sudden voltage drop, the DC capacitor voltage and rotor current i are monitored at all times r , to judge whether the DC capacitor voltage or rotor current exceeds the limit value; when the DC capacitor voltage or rotor current i r When the limit value is exceeded, the active crowbar protection circuit is triggered; when the DC capacitor voltage and the rotor current are both lower than the limit value and keep within two cycles without exceeding the limit, the active crowbar protection circuit is exited, and the rotor side and the grid side are switched simultaneously. The PI control of the converter is switched to comprehensive interference suppression control; after the voltage drop is restored, switch back to PI control to achieve the purpose of low-voltage ride-through of the wind farm when the power grid fails suddenly. Compared with the PI control strategy, the integrated LVRT control strategy designed in the present invention can make full use of the output capability of the converter, has better transient control performance during the voltage drop period, and can effectively meet the low voltage ride-through requirements of double-fed wind turbines .
Description
technical field [0001] The invention belongs to the field of power system control, and relates to an independent nonlinear control method for double converters, in particular to a converter control method for improving the low-voltage ride-through capability of double-fed wind turbines, and is especially suitable for grid connection with large-scale wind power generation transmission system. Background technique [0002] The crisis of global fossil energy shortage and environmental pollution is gradually aggravating, and the development of renewable energy has attracted widespread attention. Among various types of wind generator systems (WGS), those based on doubly fed induction generators (DFIG) are widely used due to their small size, low cost, and flexible control. Onshore wind farms. [0003] Since the stator windings of DFIG are directly connected to the grid, the operation of the wind turbine is susceptible to grid disturbances, especially grid voltage dips. For thi...
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IPC IPC(8): H02J3/16H02J3/38H02M7/5387H02P9/10H02P21/14H02P101/15H02P103/10
CPCH02J3/16H02J3/38H02M7/53871H02P9/007H02P9/105H02P21/14H02P2101/15H02P2103/10H02J2300/28Y02E40/30
Inventor 王若谷秦博宇刘健张若微戴立森高欣孙宏丽郭云涛郭安祥吴子豪王辰曦
Owner STATE GRID SHAANXI ELECTRIC POWER RES INST