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Low Voltage Ride Through Control System of Doubly-fed Induction Generator

A doubly-fed induction motor, low voltage ride through technology, applied in motor generator control, control system, vector control system and other directions, can solve the problems of poor control characteristics, long demagnetization process of stator flux linkage, etc., to improve control characteristics, The effect of avoiding the influence of the feedforward voltage and improving the control accuracy

Active Publication Date: 2019-04-19
ZHEJIANG WINDEY
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AI Technical Summary

Problems solved by technology

[0006] In order to overcome the shortcomings of the existing doubly-fed induction generator low-voltage ride-through control method, the stator flux demagnetization process is too long and the control characteristics are poor. Process control characteristics of doubly-fed induction generator low voltage ride through control system

Method used

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  • Low Voltage Ride Through Control System of Doubly-fed Induction Generator
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  • Low Voltage Ride Through Control System of Doubly-fed Induction Generator

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Embodiment Construction

[0041] The present invention will be further described below in conjunction with the accompanying drawings.

[0042] refer to figure 1 and figure 2 , a doubly-fed induction motor low-voltage ride-through control system, including a three-phase grid 100, a doubly-fed motor 101, a converter 102, a stator damping resistance switching device 103, a phase-locked loop 104, a stator voltage-current clarke conversion unit 105, Stator active power / reactive power calculation unit 106, rotor current clarke / park conversion unit 107, power outer loop 108, rotor current inner loop 109, rotor feedforward voltage calculation unit 110, SVPWM modulation calculation unit 111 and Crowbar circuit 112.

[0043] The three-phase grid 100 is a three-phase AC power supply after the 35KV bus of the grid passes through a 35KV / 690V transformer. The rotor winding of the double-fed induction generator 101 is connected to the rotor converter of the converter 102, the stator winding is connected to the thr...

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Abstract

The invention provides a doubly-fed induction generator low-voltage ride-through control system which comprises a three-phase power gird, a doubly-fed motor, an inverter, a PLL (phase locked loop), a stator voltage and current Clarke conversion unit, a stator active power and reactive power calculation unit, a rotor current Clarke / Park conversion unit, a power outer ring, a rotor current inner ring, a SVPWM modulation and computing unit, and a Crowbar circuit. The low-voltage ride-through control system also comprises a stator damping resistor switching device, and the stator winding of the doubly-fed motor is connected to the three-phase power gird through the stator damping resistor switching device. The stator damping resistor switching device is realized by the parallel connection of a bidirectional thyristor and a damping resistor. The invention provides the doubly-fed induction generator low-voltage ride-through control system with the acceleration of stator magnetic linkage demagnetization process and the improvement of the control characteristic of a unit in a low voltage-ride through process.

Description

technical field [0001] The invention relates to the control technology of a doubly-fed induction generator, in particular to a low-voltage ride-through control system of a doubly-fed induction generator. Background technique [0002] With the continuous increase of wind power penetration rate, a large number of units cut off from the grid will lead to a serious imbalance in the active power and reactive power of the grid, and the resulting disturbance will degrade the stability of the entire grid. The fault developed into multiple faults. Therefore, the wind power grid-connected guidelines require that when the grid voltage drops sharply, the wind turbines must maintain grid-connected operation and provide a certain amount of reactive power support to the grid to help the grid voltage rise and then help the grid voltage to recover; at the same time, when the grid voltage recovers Finally, the wind turbines must be able to quickly return to normal operation and output active...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02J3/38H02J3/48H02J3/50H02P21/22H02P21/28
CPCH02J3/386H02J3/48H02J3/50Y02E10/76
Inventor 赵豆豆许国东杨靖陶钧炳韩小良邱纪星周杰
Owner ZHEJIANG WINDEY
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