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Electric power system wide-area output feedback control method considering WAMS (Wide Area Measurement System) signal time delay

A technology of power system and control method, applied in the direction of adaptive control, general control system, control/regulation system, etc., can solve the problems of poor system control performance, difficulty, system instability, etc.

Inactive Publication Date: 2013-09-04
WUHAN UNIV
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  • Claims
  • Application Information

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Problems solved by technology

The existence of time lag makes the stability analysis and control of the power system more complicated and difficult, and it is also one of the root causes of system instability and system control performance deterioration.

Method used

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  • Electric power system wide-area output feedback control method considering WAMS (Wide Area Measurement System) signal time delay
  • Electric power system wide-area output feedback control method considering WAMS (Wide Area Measurement System) signal time delay
  • Electric power system wide-area output feedback control method considering WAMS (Wide Area Measurement System) signal time delay

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Embodiment

[0149] In this example, the improved free-weight matrix method is used to design a wide-area time-delay damping controller, and the New England 10-machine 39-node system is used to verify the effectiveness of the method in this paper. figure 2 shown.

[0150] The output signal of the designed wide-area time-delay damping controller WATDC is attached to the excitation system of the generators G1, G3, G8, and G9, and the input signal adopts the important tie line power and the generator power angle difference y=[P 2-30 ,P 35-22 ,δ 30-32 ,δ 30-38 ] T , where: P 2-30 is the active power of the connecting line between bus 2 and B30; P 35-22 The active work of the connecting line connecting the busbars 35 and 22; δ 30-32 is the power angle difference between G1 and G3; δ 30-38 is the power angle difference between G1 and G9. After the above design process, the required wide-area controller and the maximum time delay upper limit of 532.7ms are obtained, which can meet the ac...

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Abstract

The invention provides an electric power system wide-area output feedback control method considering WAMS (Wide Area Measurement System) signal time delay. The method comprises the following steps of: firstly, building a closed-loop wide-area electric power system general model considering feedback signal time lag on the basis of a networked control system theory; then introducing an improved free-weighting matrix approach to obtain a theorem and a deduction for time lag stability analysis of a wide-area electric power system networked control system; meanwhile, converting a non-linear matrix inequality (NLMI) into a linear matrix inequality (LMI) which is convenient to resolve by adopting an improved cone compensation algorithm, and obtaining the maximum time lag boundary of a wide-area electric power system networked controller with lower conservative property and a corresponding state feedback controller via a non-linear iterative optimization algorithm; and finally, realizing time lag output feedback control of an electric power system in combination with a mature state observer theory. The electric power system wide-area output feedback control method has the advantages of simple calculating process, higher running speed, capability of obtaining the maximum time lag upper bound of a wide-area electric power system rapidly, and easiness in implementing on the aspect of engineering.

Description

technical field [0001] The invention belongs to the technical field of power system wide-area time-delay damping control, and in particular relates to a power system wide-area output feedback control method considering the time delay of a WAMS signal. Background technique [0002] With the interconnection of large-scale power grids in my country, the network structure is more complex, the distribution area is wider, the components are more, and the dynamic behavior is also more complex. The analysis and safety early warning of such nonlinear ultra-large-scale power systems with dynamic and static uncertainties are very difficult. The long-used power system control and protection design methods based on local information and the framework of static security defense systems cannot meet the requirements of ultra-large-scale power system oscillation suppression and control, system protection and dynamic security defense. Therefore, it is necessary to strengthen the basic resear...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G05B13/04
Inventor 胡志坚张子泳
Owner WUHAN UNIV
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