Coordination control method for LVRT (Low Voltage Ride Through) of wind turbine

A technology of coordinated control and wind turbines, applied in the control of wind turbines, wind power generation, wind turbines, etc., can solve the problem of easy disconnection of wind turbines from the grid, enhance reactive power control capabilities, ensure rapid recovery, and restrain overspeeding. Effect

Inactive Publication Date: 2010-10-27
XIANGTAN UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The purpose of the present invention is to overcome the shortcoming that the wind power generating set is easy to disconnect from the grid caused by energy mismatch or torque imbalance when the voltage drops, and through the coordinated control of the power converter 5, the unloading load 6, and the pitch controller 7, Improving low voltage ride through margin of direct drive wind power system

Method used

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  • Coordination control method for LVRT (Low Voltage Ride Through) of wind turbine
  • Coordination control method for LVRT (Low Voltage Ride Through) of wind turbine
  • Coordination control method for LVRT (Low Voltage Ride Through) of wind turbine

Examples

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Effect test

Embodiment 1

[0015] Embodiment 1, by figure 1 , figure 2 It can be seen that when the transmission line fails, the early warning module 4 generates an "early warning" signal, and the coordination control module 1 sends an instruction to the pitch controller 7 to enable the fault pre-pitch mode, and the pitch controller 7 changes the pitch at a certain The speed increases the pitch angle, reduces the capture of wind energy, and reduces the output power of the wind turbine. The wind power SCADA system voltage drop analysis module 3 calculates the voltage drop amplitude and duration, and the data analysis module 9 in the coordination control module 1 detects whether the voltage drop amplitude is lower than the lower limit value, and if so, switches the power converter 5 The operation mode, from PWM control mode to STATCOM mode, prevents the voltage from continuing to drop, otherwise it maintains the original working mode. Since the distance protection and differential protection are widely...

Embodiment 2

[0016] Embodiment 2, by figure 2 , image 3 It can be seen that when the power distribution line fails, the pitch controller 7 enters the fault pre-pitch mode under the action of the "early warning" signal, and the voltage drop analysis module 3 of the wind power SCADA system calculates the voltage drop amplitude and duration. Most of the protection of distribution lines is over-current protection, and segmental over-current protection increases the time for fault removal, resulting in an increase in the duration of instantaneous voltage drops. Assuming that both the amplitude and the duration of the voltage drop exceed the limit value, at this time, the power converter 5 and the unloaded load 6 cannot meet the requirements. The pitch controller 7 switches from the pre-pitch mode to the failure emergency pitch mode, so that the pitch angle of the wind turbine increases rapidly with the maximum pitch change rate, rapidly reduces the wind energy captured by the fan, and reduce...

Embodiment 3

[0017] Embodiment 3, by figure 2 , image 3 It can be seen that when the fault point is far away, the "early warning" signal is generated by the early warning module 4, and the pitch change work is switched to the fail-safe pitch change mode. The analysis result of the voltage drop analysis module 3 of the wind power SCADA system is that the impact of the fault on the current wind farm is very small, that is, when the amplitude of the voltage drop time is very small and the duration is also very short, the coordination control module 1 does not need to be put into the fault emergency pitch change mode, When the voltage drops, the impact of the voltage drop on the wind turbine is further reduced in the fault pre-pitch mode. At this time, there is no need to put in the unloading load 6, and the power converter 5 still works normally. At this time, it can be completely adjusted by the motor itself. Ability to realize LVRT function.

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Abstract

The invention relates to a coordination control method for the LVRT (Low Voltage Ride Through) of a wind turbine, mainly solving the technical problems of DC voltage rise, and the like caused by unmatched energy at both sides of a converter in a voltage fall period. The invention adopts the technical scheme that a variable-pitch control method for implementing early warning to a voltage fall is added on a statistical analysis basis of voltage fall, a variable-pitch control strategy is improved and optimized under a voltage fall condition to realize coordination control by cooperating with a power converter and an unloading load, improve the transient voltage stability of a permanent magnet direct drive generator synchronized with a wind farm and ensure the LVRT function realization of the wind turbine and the safety and the stability of an electric network. Likewise, the in-advance acquiring of the recovery conditions of remote faults is beneficial to the rapid recovery of the maximum wind energy capture of the unit.

Description

technical field [0001] The invention relates to a low-voltage ride-through coordinated control method for a wind power generating set. Background technique [0002] The low voltage ride through (LVRT, Low Voltage Ride Through) function of the wind turbine means that it will continue to operate without disconnecting from the grid when the terminal voltage drops to a certain value, and it can even provide a certain amount of reactive power for the system to help the system recover. voltage capability. The LVRT function can avoid the protection action time and resume normal operation after the fault is removed. This can greatly reduce the number of times wind turbines are repeatedly connected to the grid when they fail, reducing the impact on the grid. [0003] The voltage drop will bring a series of transient processes to the motor, such as overvoltage, overcurrent or speed increase, which will seriously endanger the safe operation of the fan itself and its control system. ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): F03D7/00
CPCY02E10/723Y02E10/72
Inventor 段斌邓文浪杨先有敬章龙黄凌翔
Owner XIANGTAN UNIV
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