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Designing method for wide area damping controller considering electric power system operation mode changes

A wide-area damping and operating mode technology, applied in the direction of reducing/preventing power oscillation, etc., can solve problems such as large changes in system operating mode and failure of wide-area controllers

Active Publication Date: 2014-03-05
WUHAN UNIV
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Problems solved by technology

[0004] The purpose of the present invention is to propose a wide-area damping controller design method that takes into account the changes in the operation mode of the power system, aiming to solve the system operation caused by the occurrence of load switching, tie line transmission power changes, and important line switching in the power system. The wide area controller fails due to large changes in the mode, and is used to avoid the negative impact of the system time lag on the controller

Method used

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  • Designing method for wide area damping controller considering electric power system operation mode changes
  • Designing method for wide area damping controller considering electric power system operation mode changes
  • Designing method for wide area damping controller considering electric power system operation mode changes

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Embodiment Construction

[0036] Specific implementation

[0037] Step 1. First select the dispatch variable ρ; usually select important tie line power, bus voltage, generator voltage, phase angle and other key parameters that can reflect the dynamic characteristics of the system.

[0038] Step 2. Select the input and output signals of the wide-area damping controller; usually select important tie-line power, generator power angle difference or generator speed difference as the input signal of the controller. The output signal of the controller is usually attached to the strong oscillation mode. The excitation side of the related synchronous generator.

[0039] Step 3. Grid the scheduling variables to obtain (ρ l , Ρ 2 ,...Ρ i …Ρ n ) Separately for each ρ i Carry on the controller design, the design method adopts the following theorem:

[0040] If the time delay constraint is met 0 ≤ d ( t ) ≤ h ‾ Like x · ( t ) = A ( ρ ( t ) ) x ( t ) ...

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Abstract

The invention provides a designing method for a wide area damping controller considering electric power system operation mode changes. A time-lag linear parameter change method is adopted for performing modeling on an electric system, a linear equation is skillfully used for describing non-linear problems, and a state feedback controller (namely the wide area damping controller) capable of being insensitive to time varying and time-lag is designed in combination with a linear matrix inequality. In different operation modes of the system, the same wide area damping controller can be adopted for effectively restraining low-frequency oscillation of the electric system. The problem that a wide area damping controller designed through a traditional linear method is ineffective because wide-range changes happen on the operation modes of the electric system can be effectively solved. The designing method is simple in process, high in robustness and capable of effectively solving the time varying and time-lag problems in an electric system communication channel and meets requirements of engineering application.

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 design method of a wide-area damping controller that takes into account changes in the operation mode of the power system. Background technique [0002] In recent years, with the wide application of Wide Area Measurement System (WAMS) in power systems, the use of wide-area damping controllers to suppress low-frequency oscillations in power systems has become a hot spot for experts and scholars. The wide-area damping controller avoids the complicated process of coordinated configuration of parameters in the traditional power system stabilizer (Power System Stability—PSS) design process, and the wide-area signal used is more conducive to suppressing the system's inter-area low-frequency oscillation. But at the same time, many problems such as the communication delay in the wide area signal and the robustness of the controller to th...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02J3/24
Inventor 胡志坚索江镭
Owner WUHAN UNIV
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