Design method for SVC controller based on improved atomic decomposition parameter identification

A technology of atomic decomposition and identification method, which is applied in the field of SVC controller design based on improved atomic decomposition parameter identification, can solve the problem that the controller cannot be well suppressed and cannot well adapt to the characteristics of time-varying nonlinearity of the power system, etc. problem, achieve good suppression effect, suppress subsynchronous oscillation, and reduce time complexity

Active Publication Date: 2014-03-19
WUHAN UNIV
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Problems solved by technology

The SVC subsynchronous damper (SSDC) designed for subsynchronous oscillation can effectively suppress subsynchronous oscillation, but the current common controller design methods are often not well adapted to the time-varying nonlinear characteristics of power systems, making the designed The controller cannot get a good suppression effect

Method used

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  • Design method for SVC controller based on improved atomic decomposition parameter identification
  • Design method for SVC controller based on improved atomic decomposition parameter identification
  • Design method for SVC controller based on improved atomic decomposition parameter identification

Examples

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Effect test

Embodiment 1

[0126] Taking the IEEE first standard model as an example, see Figure 5 . The generator shaft system adopts a six-mass spring model, and there are five torsional vibration modes in the shaft system, and the torsional vibration frequencies are 15.71 Hz, 20.21 Hz, 25.55 Hz, 32.28 Hz and 47.46 Hz.

[0127] In order to extract the sub-synchronous oscillation mode related to the torsional vibration strength of the mass, this embodiment selects the generator speed deviation as the analysis signal. At the moment of 1.5s, a three-phase short circuit occurs in the system through the transition impedance at node B, and the fault lasts for 0.075s. Record the waveform of 0 ~ 12s period, and the sampling frequency is 1kHz.

[0128] The damped sine atom is decomposed on the signal, and after several iterations, five main damped sine atoms, that is, five vibration modes of the shaft system, are decomposed. The signal reconstructed from the atom is basically consistent with the original s...

Embodiment 2

[0139] This embodiment takes Figure 10 The series compensation transmission system of Zhongjinjie Power Plant is taken as an example, and the steps are the same as those in Embodiment 1.

[0140] In this model, Fugu Power Plant has 2 sets of 600MW units, which are sent to Xinzhou switch station through two 192km transmission lines; Jinjie Power Plant has 4 sets of 600MW units, which are sent to Xinzhou Switch Station through two 246km transmission lines; - Shibei three-circuit line is 192km long; fixed series compensating capacitors with a series compensation degree of 35% are installed on the Jinxin Line incoming line and Fuxin Line outgoing line in the Xinzhou Opening and Closing Station.

[0141] The generator shafting model of Jinjie Power Plant adopts a four-segment lumped-mass spring model, and the shafting has three modal frequencies in total, the frequency of mode 1 is 13.19Hz, the frequency of mode 2 is 22.82Hz, and the frequency of mode 3 is 28.19Hz. Among them, mo...

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Abstract

The invention discloses a design method for an SVC (Static Var Compensators) controller based on improved atomic decomposition parameter identification. Based on an overcomplete damped sine atom library, a cosine migration model, a mixed migration operator and a mutation strategy are introduced to improve the biogeography optimization method, the improved biogeography optimization method is adopted to optimize the atom decomposition method, and the improved atom decomposition method is adopted to decompose a subsynchronous oscillation signal and identify a subsynchronous oscillation modal parameter; based on the identified subsynchronous oscillation modal parameter, an SVC subsynchronous damping controller is designed and optimized by the particle swarm algorithm. According to the invention, the subsynchronous oscillation modal parameter can be quickly and accurately identified, and the designed SVC subsynchronous damping controller has a favorable subsynchronous oscillation inhibition effect.

Description

technical field [0001] The invention relates to safe and stable operation of electric power systems, and more particularly relates to an SVC controller design method based on improved atomic decomposition parameter identification. Background technique [0002] With the expansion of the scale and the further complexity of the structure of my country's power system, the problem of subsynchronous oscillation in the power system needs to be solved urgently. When subsynchronous oscillation occurs, the shafting of the mechanical system and the electrical system will generate increased torsional vibration, which will cause the shafting of the generator rotor to break in severe cases, resulting in major accidents. Rapid and accurate identification of subsynchronous oscillation modal parameters plays a vital role in subsynchronous oscillation monitoring, early warning and formulation of control measures. With the rapid development of wide-area measurement systems, the method of extr...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G06F17/50G06N3/00
Inventor 刘涤尘董飞飞廖清芬吴军岑炳成宋春丽朱振山冀星沛魏大千
Owner WUHAN UNIV
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