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Output amplitude value regulating method of wind power plant harmonic suppressor

A harmonic suppressor and amplitude adjustment technology, which is applied in wind power generation, harmonic reduction devices, and AC networks to reduce harmonics/ripples, etc., can solve the problem of inability to suppress subsynchronous oscillations of wind farms, lack of effective solutions for blocking, etc. problem, to achieve the effect of preventing locking, simple structure and reasonable design

Active Publication Date: 2019-02-15
ELECTRIC POWER RES INST STATE GRID SHANXI ELECTRIC POWER
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

When the reference signal of the harmonic suppressor exceeds the limit of the reactive power compensation device, the reactive power compensation device will be blocked and will not send any current, so that the additional harmonic suppressor of the reactive power compensator cannot suppress the subsynchronous oscillation of the wind farm as a whole
Moreover, there is currently no effective solution to prevent its latch-up

Method used

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  • Output amplitude value regulating method of wind power plant harmonic suppressor
  • Output amplitude value regulating method of wind power plant harmonic suppressor

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Embodiment Construction

[0022] In order to make the above objects, features and advantages of the present invention more comprehensible, specific implementations of the present invention will be described in detail below in conjunction with the accompanying drawings. In the following description, numerous specific details are set forth in order to provide a thorough understanding of the present invention. However, the present invention can be implemented in many other ways different from those described here, and those skilled in the art can make similar improvements without departing from the connotation of the present invention, so the present invention is not limited by the specific implementations disclosed below.

[0023] It should be noted that when an element is referred to as being “fixed” to another element, it can be directly on the other element or there can also be an intervening element. When an element is referred to as being "connected to" another element, it can be directly connected ...

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Abstract

The invention provides an output amplitude value regulating method of a wind power plant harmonic suppressor, and relates to the technical field of an electric power system. The method comprises the following steps of 1, calculating an instruction signal x(t) according to a subsynchronous frequency component in voltage or current when subsynchronous oscillation occurs on a power grid; 2, performing real-time judgment on the instruction signal x(t), and outputting a reference signal y(t) according to the judgment result; and 3, sending corresponding current by a reactive power compensation device according to the y(t) in the step 2, and injecting the current into the power grid. The instruction signal x(t) is calculated and judged; the work state of the reactive power compensation device can be regulated in real time; the output capability of the reactive power compensation device can be improved; the locking effect caused by amplitude limitation can be prevented; and the reactive powercompensation device can be enabled to normally work under various conditions.

Description

Technical field: [0001] The invention relates to the technical field of power systems, in particular to a method for adjusting the output amplitude of a harmonic suppressor in a wind farm. Background technique: [0002] In order to improve the transmission capacity of long-distance lines in wind farms, high-voltage direct current transmission or series compensation capacitors are generally used. However, these devices will cause unstable subsynchronous oscillations in the power system. At present, subsynchronous oscillation can be suppressed in the form of additional harmonic suppressor of reactive power compensation device. The reactive power compensation device uses the output signal of the harmonic suppressor as a reference signal to send out a current that suppresses subsynchronous oscillation. When the reference signal of the harmonic suppressor exceeds the limit of the reactive power compensation device, the reactive power compensation device will be blocked and will ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02J3/18H02J3/01H02J3/24
CPCH02J3/01H02J3/18H02J3/24Y02E10/76Y02E40/30Y02E40/40
Inventor 郑惠萍刘新元杨尉薇段永泽郝鑫杰程雪婷曲莹郝捷张颖马东娟
Owner ELECTRIC POWER RES INST STATE GRID SHANXI ELECTRIC POWER
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