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Method for suppressing sub-synchronous oscillation based on thyristor controlled reactor

A technology of thyristor control and sub-synchronous oscillation, which is applied to control generators, control systems, and reduce/prevent power oscillations. , universal applicability, the effect of suppressing subsynchronous resonance

Inactive Publication Date: 2010-09-15
ZHEJIANG UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The first problem is that the physical meaning of the control strategy is not clear, and there are certain difficulties in engineering implementation
The second problem is that the controller design is mostly based on the TCR fundamental wave steady-state model, and this model is not applicable in the sub-synchronous frequency range, so this controller design method is theoretically flawed

Method used

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  • Method for suppressing sub-synchronous oscillation based on thyristor controlled reactor
  • Method for suppressing sub-synchronous oscillation based on thyristor controlled reactor
  • Method for suppressing sub-synchronous oscillation based on thyristor controlled reactor

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Embodiment Construction

[0036] The specific implementation of the present invention will be described in detail below in conjunction with the drawings and examples, but the present invention is not limited by the specific examples.

[0037] Using a test system such as image 3 As shown, the shaft system of the mechanical system is composed of 6 mass blocks, which are high-pressure cylinder (HP), medium-pressure cylinder (IP), low-pressure cylinder A (LA), low-pressure cylinder B (LB), generator (GEN) and excitation Machine (EXC), including 5 torsional vibration modes, the torsional vibration frequencies of modes 1 to 5 are 15.71Hz, 20.21Hz, 25.55Hz, 32.28Hz and 47.45Hz. The TCR is arranged on the high-voltage side of the step-up transformer, the TCR is connected in a delta, the capacity is 10% of the generator capacity, and the reference firing angle α 0 =135°. The connection transformer of TCR is Δ / Y connection method, 539kV / 35kV, and the rated capacity is 100MVA. The series complement degree in ...

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Abstract

The invention discloses a method for suppressing sub-synchronous oscillation (SSR) based on a thyristor controlled reactor (TCR). In the method, the phase relationship of a TCR trigger angle alpha and electrical torque Te of a generator is measured through a time domain frequency scanning method, and based on the phase compensation principle, filtering, amplifying and phase compensation are respectively carried out on component of each comtorsional vibration mode of speed signal of the generator by utilizing a plurality of modes for controlling channels, thereby the TCR can provide positive electrical damping near each dangerous torsional vibration mode of the generator, and the purpose of suppressing sub-synchronous oscillation is achieved. The method has the advantages of definite physical conception and convenient engineering implement.

Description

technical field [0001] The invention proposes a method for suppressing subsynchronous oscillation of a power system by using a thyristor-controlled reactor (TCR), which belongs to an innovative technology for suppressing subsynchronous oscillation of a power system. Background technique [0002] The AC transmission line adopts series capacitor compensation, which can greatly improve the transmission capacity of the AC line, and has huge economic benefits. In recent years, large-scale coal power bases represented by Inner Mongolia Yimin Power Plant, Tuoketuo Power Plant, Shangdu Power Plant and Shaanxi Jinjie Power Plant have adopted the transmission mode of AC line plus series capacitor compensation. However, the transmission mode of AC line plus series capacitor compensation may cause the subsynchronous resonance (SSR) problem of the generator set, which becomes a major threat to the safe operation of the power grid. [0003] To suppress SSR, various solutions have been pr...

Claims

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Application Information

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IPC IPC(8): H02J3/24H02P9/00
Inventor 徐政郑翔张静
Owner ZHEJIANG UNIV
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