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WAMS-based low-frequency oscillation decentralized controller design method considering interaction

A decentralized controller and low-frequency oscillation technology, applied in the direction of reducing/preventing power oscillation, etc., can solve impractical problems, achieve reduced dependence, good control effect, and increased adaptability

Active Publication Date: 2016-01-27
NORTH CHINA ELECTRIC POWER UNIV (BAODING)
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Problems solved by technology

This multi-controller parameter optimization method not only requires all the system modeling parameters to be known, but also the calculation amount and time consumption are limited by the number of parameters, which is extremely impractical in the interconnected large power grid

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  • WAMS-based low-frequency oscillation decentralized controller design method considering interaction
  • WAMS-based low-frequency oscillation decentralized controller design method considering interaction
  • WAMS-based low-frequency oscillation decentralized controller design method considering interaction

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Embodiment Construction

[0029] The method of the present invention will be further explained below in conjunction with the drawings, including system modal parameter identification, key mode determination, controllability calculation, control loop combination Pareto optimal set solution, and optimal control loop combination design of each controller.

[0030] Step 1: Identify the modal parameters of the system and determine the number of key modes and controllers based on the N4SID method.

[0031] Due to the large error of the single-input single-output identification result, the present invention is based on the N4SID method, using WAMS to collect multiple sets of disturbance signals and the power angle, angular velocity or active signal of each unit, and identify the reduced-order state matrix of the single-input multiple-output system group by group. The fitness function value that satisfies the identification result is greater than 90%, and the system reduced-order state matrix A is obtained by combin...

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Abstract

The invention discloses a WAMS-based low-frequency oscillation decentralized controller design method considering interaction which can be applied to low-frequency oscillation control of a power system. The method comprises the steps of: acquiring modal information by integrating multiple identification results; identifying controllability and observability by adopting a state subspace model identification method (N4SID), and determining installation positions of controllers and candidate feedback signals; transferring functional matrix definition according to MIMO for identification and solution row by row, calculating a highly-controllable low-interaction control loop combination by utilizing a branch and bound method, and converting a complex multi-controller coordination design problem into a simple decentralized controller independent design problem; designing a PSS for a region pattern by adopting an identification-based pole placement method, and designing the controllers for an interval pattern by adopting a model prediction control method. The good control effects of the two types of independently designed controllers verify effectiveness of the WAMS-based low-frequency oscillation decentralized controller design method. The WAMS-based low-frequency oscillation decentralized controller design method provides a new idea for designing a multi-damping controller based on identification coordination.

Description

Technical field [0001] The invention belongs to the field of power system low-frequency oscillation analysis and control applications, and particularly relates to a power system low-frequency oscillation coordinated damping control based on WAMS multi-signal identification to solve system control characteristics, and to determine a control loop combination with high controllability and small interaction method. Background technique [0002] With the expansion of the scale of regional interconnection of power systems, the exchange of power between regions has become more frequent, and the operation of power grids has become more complex. Low-frequency oscillation has become an important factor affecting the stable operation of the power grid and restricting the transmission capacity of the power grid. Therefore, in order to ensure the safe and stable operation of the power system, research on the coordinated control of low-frequency oscillations in interconnected large-scale power...

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Application Information

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IPC IPC(8): H02J3/24
Inventor 马燕峰周一辰赵书强胡永强
Owner NORTH CHINA ELECTRIC POWER UNIV (BAODING)
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