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Device and method for suppressing subsynchronous oscillation of power system

A sub-synchronous oscillation and power system technology, applied in the direction of reducing/preventing power oscillations, can solve problems such as weak robustness, high requirements for system mathematical modeling, and difficult control effects, so as to reduce dependence and suppress secondary The effect of synchronous oscillation

Inactive Publication Date: 2012-02-01
SOUTHEAST UNIV
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Problems solved by technology

[0004] The existing additional excitation damping control is based on classical control theory, which requires high mathematical modeling of the system, and it is difficult to obtain a satisfactory control effect, and its robustness is not strong.

Method used

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  • Device and method for suppressing subsynchronous oscillation of power system
  • Device and method for suppressing subsynchronous oscillation of power system
  • Device and method for suppressing subsynchronous oscillation of power system

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Embodiment Construction

[0038] The present invention will be further described below in conjunction with the accompanying drawings.

[0039] like figure 1 Shown is a suppression device for subsynchronous oscillations in power systems, including a generator speed deviation signal Δω acquisition device, which processes the speed deviation signal Δω to obtain subsynchronous speed deviation signals Δω for each oscillation mode i 1. For the subsynchronous speed deviation signal Δω of each oscillation mode i Processed to obtain the rate of change of the rotational speed deviation signal for each oscillation mode 2. For the subsynchronous speed deviation signal Δω of each oscillation mode i and the rate of change of the speed deviation signal A fuzzy inference system 3 for processing to obtain additional damping control signals of each oscillation mode, and amplifying and limiting the nearby damping control signals of each oscillation mode, and superimposing all the signals generated by the amplificatio...

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Abstract

The invention discloses a device and method for suppressing subsynchronous oscillation of a power system. The method comprises the following steps of: firstly, filtering the rotation speed signal of a generator to obtain the subsynchronous rotation speed signal of each mode; processing the subsynchronous rotation speed signal of each mode respectively to obtain a change rate; then, generating an additional control signal through a Sugeno type fuzzy reasoning system; and finally, performing amplification, overlapping and amplitude limiting on the obtained additional control signal, and generating an exciting voltage additional control signal so as to change the exciting current, generate a subsynchronous frequency damping torque and suppress the subsynchronous oscillation. In the method provided by the invention, a training sample of a fuzzy controller is established according to the phase compensation principle, and the parameters of the fuzzy system are optimized and trained by use of a learning algorithm of an error backpropagation neural network. The method solves the problem that the expert experience is difficult to obtain by the fuzzy controller, and the additional exciting damping controller can effectively suppress the subsynchronous oscillation of the power system.

Description

technical field [0001] The invention relates to power system stability and control technology, in particular to a generator additional excitation damping control device and a suppression method based on a fuzzy neural network for improving the stability of power system subsynchronous oscillation. Background technique [0002] The application of AC series compensation technology in the power system is more and more extensive. Adding series capacitors in the transmission line can reduce the equivalent reactance of the line and reduce the phase angle difference between the two ends of the system, thereby obtaining a higher stability margin and a larger transmission power. However, the series compensation transmission network (including generators, transformers, lines, series capacitors and other components) will form an electrical resonance circuit, if the natural frequency of this electrical resonance circuit is complementary to the natural frequency of the torsional vibration...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02J3/24
Inventor 吴熙蒋平
Owner SOUTHEAST UNIV
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