A method and system for coordinated correction of power system frequency and voltage based on model predictive control
A model predictive control, power system technology, applied in circuit devices, AC network circuits, reducing/preventing power oscillations, etc., can solve problems such as long-term voltage and frequency stability in power systems, and improve frequency and voltage stability analysis and decision-making ability, improve efficiency, and enrich the effect of decision-making tools
Active Publication Date: 2021-06-04
CHINA ELECTRIC POWER RES INST +1
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[0004] The present invention proposes a power system frequency and voltage coordination correction method and system based on model predictive control to solve the problem of how to ensure the medium and long-term voltage and frequency stability of the power system
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[0076] Exemplary embodiments of the present invention will now be described with reference to the drawings; however, the present invention may be embodied in many different forms and are not limited to the embodiments described herein, which are provided for the purpose of exhaustively and completely disclosing the present invention. invention and fully convey the scope of the invention to those skilled in the art. The terms used in the exemplary embodiments shown in the drawings do not limit the present invention. In the figures, the same units / elements are given the same reference numerals.
[0077] Unless otherwise specified, the terms (including scientific and technical terms) used herein have the commonly understood meanings to those skilled in the art. In addition, it can be understood that terms defined by commonly used dictionaries should be understood to have consistent meanings in the context of their related fields, and should not be understood as idealized or over...
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The present invention provides a power system frequency and voltage coordinated correction method based on model predictive control, including: step 1, predicting the system reference response track of the current forecast period according to the system operation data at the initial moment of the current forecast period of the power system, and using Calculate the trajectory sensitivity by numerical method and direct method; step 2, determine the frequency and voltage coordination optimization model according to the trajectory sensitivity, control set, desired trajectory and simplified constraints; step 3, solve the frequency and voltage coordination optimization model to determine the control quantity, and Put in the control amount at the initial moment of the next forecast period; step 4, judge whether the voltage and frequency of the power system have recovered to the steady-state operation level; if they have recovered, then end; otherwise, return to step 1. The invention improves the efficiency of optimization and reduces the possibility of no solution, performs closed-loop coordinated control on frequency and voltage, and improves the ability of frequency and voltage stability analysis and decision-making of power system scheduling operators.
Description
technical field [0001] The present invention relates to the technical field of electric power system, and more specifically, relates to a method and system for coordinating and correcting frequency and voltage of electric power system based on model predictive control. Background technique [0002] After a single DC incoming call or the loss of multiple UHV DC circuits, the large power shortage will easily cause continuous frequency stability problems. A short-circuit fault in the AC system may cause multiple DC simultaneous / continuous commutation failures, and the DC absorbs a large amount of reactive power from the system, resulting in slow voltage recovery, causing voltage safety issues. Under the action of DC commutation failure and cascading faults, the receiving end power grid may cause frequency and voltage problems at the same time. Strong straight and weak AC, and the total capacity of the fed-in DC accounted for an increased proportion of the load. The East China...
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IPC IPC(8): H02J3/24
CPCH02J3/24H02J2203/20
Inventor 许鹏飞宋墩文马世英汤伟杨铖宋新立杨学涛胡晓飞刘辉李铮杜三恩陈勇侯俊贤刘道伟仲悟之冯静熊选文
Owner CHINA ELECTRIC POWER RES INST