A method for overvoltage suppression of flexible direct current transmission system connected to wind farms

A DC voltage and power transmission system technology, applied in the direction of power transmission AC network, etc., can solve problems such as system outage, output power reduction, and threat to AC system stability
CN104158205BInactive Publication Date: 2016-04-20NORTH CHINA ELECTRIC POWER UNIV (BAODING) +2
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Patents(China)
Current Assignee / Owner
NORTH CHINA ELECTRIC POWER UNIV (BAODING)
Publication Date
2016-04-20
Estimated Expiration
Not applicable · inactive patent

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Abstract

The invention relates to a direct-current overvoltage suppressing method of a flexible direct-current power transmission system connected with a wind farm in the technical field of wind farm power transmission. When the voltage of a receiving-end alternating-current system drops, the alternating-current voltage frequency output by a sending-end converter station is increased according to acquired direct-current voltage and is tracked in real time by a doubly-fed wind turbine controller. The doubly-fed wind turbine controller adjusts the rotation speed of a doubly-fed wind turbine according to the relation between the alternating-current voltage frequency and the angular speed of the doubly-fed wind turbine so as to increase the kinetic energy of the wind turbine, reduce the output power of the wind farm and suppress the rise of the direct-current voltage. When the voltage of the receiving-end alternating-current system is restored to the rated value, the sending-end converter station controls the alternating-current voltage frequency to be restored to the rated value. According to the method of the invention, neither wind turbine switching nor communication between the converter station and the wind farm is needed, the system is more reliable, and adjustment is quicker.
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Description

technical field

[0001] The invention relates to the technical field of wind farm power transmission and distribution, in particular to an overvoltage suppression method for a flexible direct current transmission system connected to a wind farm. Background technique

[0002] With the large-scale development of wind power, more and more wind power will be sent through the flexible direct current transmission system. However, in the area where the wind farm is located, the strength of the AC grid is weak or there is no AC grid support, so the island operation mode is adopted, and the sending end converter station VSC1 (VoltageSourceConverter1) of the flexible DC transmission system is required to adopt constant AC voltage and constant frequency control for Wind farms provide AC voltage. With this control method, there will be some disadvantages:

[0003] 1. The sending-end converter station VSC1 will be equivalent to an ideal AC power supply, which cannot adjust the output po...

Claims

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