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Low-voltage ride through control method and device for doubly-fed wind power generating system

A doubly-fed wind power generation and low-voltage ride-through technology, which is applied in wind power generation, control systems, control generators, etc., can solve secondary overcurrent, DC bus voltage overvoltage, small capacity and cannot adapt to large-capacity doubly-fed wind power generation System and other problems, to achieve the effect of large release resistance, prevent secondary overcurrent, and shorten the transition process time

Active Publication Date: 2012-01-18
CHINA UNIV OF MINING & TECH +1
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AI Technical Summary

Problems solved by technology

[0004] The current IGBT-based crowbar protection circuit used in low-voltage ride-through has defects: (1) the capacity is small and cannot adapt to large-capacity double-fed wind power generation systems, (2) it is easy to cause DC bus voltage overvoltage and secondary overcurrent, etc. question

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  • Low-voltage ride through control method and device for doubly-fed wind power generating system
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  • Low-voltage ride through control method and device for doubly-fed wind power generating system

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Embodiment Construction

[0019] An embodiment of the present invention will be further described below in conjunction with accompanying drawing:

[0020] Such as figure 1 As shown, in the low-voltage ride-through control method of the doubly-fed wind power generation system of the present invention, when a low-voltage fault occurs in the grid, the signal detection circuit 9 transmits the detected low-voltage fault signal to the motor controller 8, and the motor controller 8 receives After receiving this signal, a control command is sent to make the reversible power converter 7 stop working, and at the same time, a signal is sent to open the main release circuit and the auxiliary release circuit in the crowbar protection circuit 10, so as to quickly release the transient surge current in the rotor winding 6 of the doubly-fed motor, At this time, the main release circuit and the auxiliary release circuit work in parallel, and the smaller equivalent release resistance in the crowbar protection circuit 10...

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Abstract

The invention discloses a low-voltage ride through control method and a low-voltage ride through control device for a doubly-fed wind power generating system. The device comprises a reversible power converter, a motor controller, a signal detection circuit and a crowbar protection circuit. The crowbar protection circuit consists of a three-phase uncontrolled bridge rectifier, a primary release circuit and a secondary release circuit. When a power grid has a low-voltage failure, the reversible power converter stops working, the primary and secondary release circuits in the crowbar protection circuit are switched on at the same time and work in parallel to rapidly release transient impact current in a rotor winding of a doubly-fed motor; when the current of a rotor attenuated to a rated value, the secondary release circuit stops working, and the primary release circuit is still switched on to release the transient current in the rotor wining; and after the low-voltage failure of the power grid is eliminated to recover the voltage of the power grid, the reversible power converter restarts working, and the crowbar protection circuit completely stops working. By the method and the device, high ride through capability and good effects are ensured, the time of a transient process for low-voltage ride through can be shortened, the voltage recovery of the power grid can be accelerated and secondary over-current can be effectively prevented.

Description

technical field [0001] The invention relates to the field of wind power generation, in particular to a low-voltage ride-through control method and device for a doubly-fed wind power generation system. Background technique [0002] In recent years, with the development of wind power generation technology, the installed capacity of wind power generation has been increasing year by year. After the power grid fails and the voltage drops, if the wind power generation units are disconnected, it will bring about transient instability of the power system and may cause Partial or even systemic paralysis. Therefore, the power system puts forward a series of requirements for the operation of wind farms, including the fault ride-through capability of the grid, that is, when the voltage at the grid-connected point of the wind turbine drops, the wind turbine can remain connected to the grid, and even provide a certain amount of reactive power to the grid to support the grid voltage recove...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02J3/38H02P9/10
CPCY02E10/763Y02E10/76
Inventor 谭国俊邓先明甄文欢
Owner CHINA UNIV OF MINING & TECH
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