A Design Method of Low Frequency Oscillating Decentralized Controller Based on WAMs Considering the Interaction
A decentralized controller, low-frequency oscillation technology, applied in the direction of reducing/preventing power oscillation, can solve problems such as impracticality, and achieve the effect of reducing dependence, good control effect, and increasing adaptability
Active Publication Date: 2017-11-17
NORTH CHINA ELECTRIC POWER UNIV (BAODING)
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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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[0029] The method of the present invention will be further described below in conjunction with the accompanying drawings, including system modal parameter identification, key mode determination, controllable observability calculation, control loop combination Pareto optimal set solution, and the design of each controller under the optimal control loop combination.
[0030] Step 1: Identify the system modal parameters and determine the number of key modes and controllers based on the N4SID method.
[0031] Due to the relatively large error of the single-input-single-output identification result, the present invention is based on the N4SID method, uses WAMS to collect multiple groups of disturbance signals and the power angle, angular velocity or active power signal of each unit, and identifies the reduced-order state matrix of the single-input multiple-output system group by group. The fitness function value that satisfies the identification results is greater than 90%, and the ...
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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 application field of low-frequency oscillation analysis and control of power systems, and in particular relates to a coordinated damping control of low-frequency oscillations of power systems based on WAMS multi-signal identification to solve system control characteristics, and to determine a combination of control loops with high controllability and small interaction method. Background technique [0002] With the expansion of the regional interconnection scale of the power system, inter-regional power exchanges become more frequent, and the operation mode of the power grid becomes 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, it is of great application value to study the coordinated control of low-frequency osc...
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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)