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Method and device for assessing sub-synchronous resonance

A sub-synchronous resonance, machine-network technology, applied in the direction of circuit devices, AC network circuits, electrical components, etc., can solve the problem of not considering the actual damping characteristics of the machine-network system, not comprehensively considering electrical damping and mechanical damping, and not being able to accurately evaluate the secondary Problems such as synchronous resonance

Inactive Publication Date: 2012-07-25
南方电网技术研究中心 +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] When evaluating the subsynchronous resonance in prior art 1, only the frequency characteristics of the machine-network system are considered, and the actual damping characteristics of the machine-grid system are not considered, so the subsynchronous resonance cannot be accurately evaluated; in prior art 2, when evaluating the subsynchronous resonance , only electrical damping is considered, without comprehensive consideration of electrical damping and mechanical damping, the subsynchronous resonance cannot be evaluated comprehensively and accurately

Method used

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  • Method and device for assessing sub-synchronous resonance
  • Method and device for assessing sub-synchronous resonance
  • Method and device for assessing sub-synchronous resonance

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Embodiment 1

[0079] see figure 1 , the embodiment of the present invention provides a subsynchronous resonance evaluation method, the method flow is as follows:

[0080] Step 101: Obtain the electrical damping of the machine-grid system, and acquire the mechanical damping of the machine-grid system;

[0081] Step 102: Obtain the total damping of the machine-network system according to the electrical damping and mechanical damping of the machine-network system;

[0082] Step 103: Evaluate the subsynchronous resonance of the machine-network system according to the total damping of the machine-grid system.

[0083] The method provided by the embodiment of the present invention obtains the total damping by combining the electrical damping and mechanical damping of the machine-network system, and evaluates the subsynchronous resonance of the machine-grid system according to the total damping, not only considering the electrical damping, but also combining the mechanical damping, which can be c...

Embodiment 2

[0085] see figure 2 , the embodiment of the present invention provides a subsynchronous resonance evaluation method, the method flow is as follows:

[0086] Step 201: The machine-network system is equivalent to a general machine-network equivalent circuit, the general machine-network equivalent circuit includes a first circuit and a generator connected to the first circuit, and the first circuit specifically includes: a first resistor R 1 , the first inductance L 1 and the first capacitor C 1 The first series circuit after series connection and the second resistance R 2 and the second inductance L 2 The second series circuit connected in series is connected in parallel, and the circuit connected in parallel is connected in series with the third resistor R 0 ;

[0087] For the machine-network system, the embodiment of the present invention, in a specific operation mode, according to the range of the sub-synchronous torsional vibration frequency of the generator shafting (...

Embodiment 3

[0129] see Figure 6 , an embodiment of the present invention provides an evaluation device for subsynchronous resonance, the device includes:

[0130] The first acquiring module 301 is configured to acquire the electrical damping of the machine-grid system, and acquire the mechanical damping of the machine-grid system;

[0131] In the second acquisition module 302, the user acquires the total damping of the machine-network system according to the electrical damping and mechanical damping of the machine-network system acquired by the first acquiring module 301;

[0132] The evaluation module 303 is configured to evaluate the subsynchronous resonance of the machine-grid system according to the total damping of the machine-grid system acquired by the second acquiring module 302 .

[0133] For the first acquisition module 301, see Figure 7 , the first acquisition module 301 includes:

[0134] The equivalent unit 301a is used to equate the machine-network system into a general...

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Abstract

The invention discloses a method and a device for assessing sub-synchronous resonance, and belongs to the technical field of stability analysis of a power system. The method comprises the following steps of: acquiring electric damping and mechanical damping of a machine screen system; acquiring total damping of the machine screen system according to the electric damping and the mechanical dampingof the machine screen system; and assessing the sub-synchronous resonance of the machine screen system according to the total damping of the machine screen system. The device comprises a first acquisition module, a second acquisition module and an assessment module. The method and the device can comprehensively and accurately assess the sub-synchronous resonance of the machine screen system by acquiring the total damping according to the electric damping and the mechanical damping of the machine screen system and assessing the sub-synchronous resonance of the machine screen system according to the total damping.

Description

technical field [0001] The invention relates to the technical field of power system stability analysis, in particular to an evaluation method and device for subsynchronous resonance. Background technique [0002] In the ultra-high voltage transmission system, the use of series compensation (referred to as series compensation) transmission system is an effective method to increase the long-distance transmission capacity and improve the stability of the transmission system. However, when the electrical resonance frequency of the series-compensated transmission network is close to complementary to the mechanical torsional vibration frequency of the generator shafting, it may lead to under-damping or negative damping of the torsional vibration of the generator shafting, resulting in a series-compensated transmission system and a generator. Sub-synchronous resonance (SSR) occurs in the machine-network system. When the sub-synchronous resonance is severe, the generator shaft will ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02J3/00
Inventor 谢小荣杨煜黎小林王忠军
Owner 南方电网技术研究中心
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