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An apparatus and method for suppressing subsynchronous oscillation based on bypass current compensation

A sub-synchronous oscillation and bypass current technology, applied in harmonic reduction devices, reducing/preventing power oscillation, AC network to reduce harmonics/ripples, etc., can solve problems such as complex control parameter design and sensitive system operating conditions

Active Publication Date: 2018-12-18
NORTHEASTERN UNIV
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  • Claims
  • Application Information

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Problems solved by technology

This method has fast response speed and good suppression effect, but the design of control parameters is relatively complicated and sensitive to system operating conditions

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  • An apparatus and method for suppressing subsynchronous oscillation based on bypass current compensation
  • An apparatus and method for suppressing subsynchronous oscillation based on bypass current compensation
  • An apparatus and method for suppressing subsynchronous oscillation based on bypass current compensation

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Embodiment Construction

[0044] The specific implementation manners of the present invention will be further described in detail below in conjunction with the accompanying drawings and embodiments. The following examples are used to illustrate the present invention, but are not intended to limit the scope of the present invention.

[0045] This example is as follows:

[0046] On the one hand, the present invention provides a subsynchronous oscillation suppression device based on bypass current compensation, such as figure 1 As shown, including parallel bandpass filter, control module, current regulator;

[0047] The parallel bandpass filter is connected in parallel with the current regulator, and then connected in series between the fan and the step-up transformer. Under power frequency conditions, the parallel bandpass filter has a small impedance, which is equivalent to a short circuit, and is used to pass power frequency current. Does not affect the normal transmission of fan power, i.e. 1 = i ...

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Abstract

The invention provides a device and a method for suppressing subsynchronous oscillation based on bypass current compensation, which relate to the field of stability analysis of a new energy grid-connected system. The invention collects the bypass harmonic current on the outlet line of the fan for amplitude adjustment and phase shifting treatment, so that the amplitude of the bypass harmonic current is equal to the amplitude of another part of the harmonic component in the line, and the phase is opposite to each other, thereby canceling each other, and the purpose of suppressing the subsynchronous oscillation is achieved. The invention does not need a FACTS device as an injection current source, reduces the interference of external current and harmonics, simplifies the control structure ofthe suppression system, and ensures the safe and economic operation of the power system.

Description

technical field [0001] The invention relates to the technical field of stability analysis of new energy grid-connected systems, in particular to a subsynchronous oscillation suppression device and method based on bypass current compensation. Background technique [0002] Power system subsynchronous oscillation is a continuous or even increasing oscillation caused by the coupling of dynamic processes of mechanical equipment and electrical equipment in the power system. It is one of the common problems in the field of power system stability analysis. Because its oscillation frequency is less than the power frequency of 50Hz, it is called subsynchronous oscillation. At present, most of the research fields on subsynchronous oscillation focus on large-scale thermal power and hydropower transmission through series compensation technology and high-voltage direct current transmission technology. However, the research on the subsynchronous oscillation problem of wind power grid-conn...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02J3/24H02J3/01
CPCH02J3/01H02J3/24Y02E40/40
Inventor 马大中高裕杨珺刘鑫蕊孙秋野张化光杨东升黄博南汪刚会国涛王智良
Owner NORTHEASTERN UNIV