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Method for prediction of electrical power system electromechanical oscillation mode after accessing multi-port direct current system

A multi-terminal DC and electromechanical oscillation technology, which is applied in AC network circuits, reducing/preventing power oscillation, circuit devices, etc., can solve the problems of complex modal calculation process and heavy calculation burden, and achieve reduced calculation complexity without losing accuracy Degree, the effect of reducing the order of the model

Active Publication Date: 2017-02-15
NORTH CHINA ELECTRIC POWER UNIV (BAODING) +2
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Problems solved by technology

[0004] Using the above method to analyze the stability of the multi-terminal DC system after it is connected to the AC system, it is necessary to derive the state matrix of the closed-loop system. heavy

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  • Method for prediction of electrical power system electromechanical oscillation mode after accessing multi-port direct current system
  • Method for prediction of electrical power system electromechanical oscillation mode after accessing multi-port direct current system
  • Method for prediction of electrical power system electromechanical oscillation mode after accessing multi-port direct current system

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Embodiment Construction

[0026] The embodiments will be described in detail below in conjunction with the accompanying drawings.

[0027] The purpose of the present invention is to propose a derivation method capable of predicting the electromechanical oscillation mode of the power system after the multi-terminal DC system is connected, and a fast estimation method capable of predicting the electromechanical oscillation mode of the power system after the multi-terminal DC system is connected, so as to reduce the eigenvalue The model order and computational complexity in the analysis provide a practical method for engineering practice that is simple, efficient and accurate.

[0028] To achieve the above object, the technical solution adopted in the present invention is:

[0029] A fast estimation method that can predict the electromechanical oscillation mode of the power system after the multi-terminal DC system is connected, the establishment of the transfer function of the multi-terminal DC system an...

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Abstract

The present invention relates to a full-system model establishing method when a multi-port direct current system an alternating current system are interconnected, especially to an estimation method of the full-system electromechanical oscillation mode after the multi-port direct current system is accessed to the alternating current system. The method comprises the following steps: S1: establishing the transfer function model of the multi-port direct current system and the transfer function model of an alternating current system, and determining the coupling relation between the transfer function model of the multi-port direct current system and the transfer function model of an alternating current system; and S2: assessing the influence of the dynamic interaction effect of the multi-port direct current system and the alternating current system on the system electromechanical oscillation mode according to the coupling relation. The present invention provides a derivation method capable of predicting the electrical power system electromechanical oscillation mode after accessing the multi-port direct current system and a rapid estimation method capable of predicting the electrical power system electromechanical oscillation mode after accessing the multi-port direct current system, so that the model order and the computation complexity in the feature value analysis are reduced, and a simple and effective practical method without losing accuracy is provided for the engineering practice.

Description

technical field [0001] The invention relates to a method for establishing a whole-system model when a multi-terminal DC system is interconnected with an AC system, in particular to a method for quickly estimating the electromechanical oscillation mode of the whole system after the multi-terminal DC system is connected to an AC system. Background technique [0002] Most of my country's water power resources are distributed in the southwest region, while wind and solar energy resources are distributed in the northwest region. The research of large-capacity power transmission has become a very hot topic nowadays. Due to the advantages of low loss and large transmission capacity, DC transmission technology is more and more widely used in the field of long-distance power transmission. With the continuous expansion of wind farms and photovoltaic power plants, new energy power generation is more connected to the AC system through the DC system. Under this development trend, these ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02J3/24
CPCH02J3/24H02J2203/20
Inventor 杜文娟付强张琰王海风
Owner NORTH CHINA ELECTRIC POWER UNIV (BAODING)
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