Equivalent method for electromagnetic and electromechanical transient hybrid simulation electromagnetic side system

A hybrid simulation and electromagnetic technology, applied in the effective field, can solve the problems of limited selection of phasor extraction algorithms, inapplicability, incomplete information representation of the opposite system, etc., to achieve the effect of improving simulation accuracy and reducing simulation errors.

Inactive Publication Date: 2015-05-13
NORTH CHINA ELECTRIC POWER UNIV (BAODING)
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Problems solved by technology

The current source equivalent is to transfer the current injected from the electromagnetic side of the interface to the electromechanical side to the electromechanical side in the form of a phasor, which is used for electromechanical transient simulation of the electromechanical side system. However, the current phase has relative properties, and the phase angle depends on signal sampling The starting time of the data window, so there are certain restrictions on the selection of phasor extraction algorithms
Equivalenting the electromagnetic side system in the form of a power source avoids the direct calculation of the absolute phase, but its representation of the information of the opposite side system is still incomplete
The premise of Norton equivalent is to obtain the node admittance matrix and injection current of all nodes on the electromagnetic side, but this method is obviously not suitable for commercial electromagnetic transient simulation platforms such as RTDS (Real Time Digital Simulator) or PSCAD on the electromagnetic side. Happening

Method used

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  • Equivalent method for electromagnetic and electromechanical transient hybrid simulation electromagnetic side system
  • Equivalent method for electromagnetic and electromechanical transient hybrid simulation electromagnetic side system
  • Equivalent method for electromagnetic and electromechanical transient hybrid simulation electromagnetic side system

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Embodiment 1

[0022] Extract the voltage fundamental wave positive sequence phasor U at each interface bus at the same time k ∠θ k Positive sequence phasor with current fundamental wave k is the interface bus label, θ k and Respectively, the voltage fundamental positive sequence phasor phase of the kth interface bus and the current fundamental positive sequence phasor phase injected from the electromagnetic system into the interface bus;

[0023] According to the voltage fundamental positive sequence phasor U k ∠θ k Positive sequence phasor with current fundamental wave Calculate the active power P injected from the electromechanical side to the electromagnetic side at the k interface k and reactive power Q k ,in

[0024] According to the solution format of the electromechanical side network equation is:

[0025] YU=I (1)

[0026] Among them, Y is the admittance matrix of the electromechanical network, U is the node voltage matrix, and I is the node injection current matrix, ...

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Abstract

The invention discloses an equivalent method for an electromagnetic and electromechanical transient hybrid simulation electromagnetic side system, and belongs to the technical field of electric system simulation. The method is suitable for a commercial electromagnetic transient simulation platform, and includes the steps that voltage fundamental wave positive sequence phasors and current fundamental wave positive sequence phasors at all interface buses are extracted; active power P and reactive power Q which are injected from an electromechanical side to an electromagnetic side of the interfaces are calculated; P, Q, the positive sequence voltage amplitude values U of the interfaces and the phase angle difference between voltages of the interfaces serve as equivalent information of the interface k and are transmitted to the electromechanical transient simulation platform; a corresponding iteration coefficient matrix is constructed, and used for obtaining voltages of electromechanical transient simulation nodes in an iteration mode. According to the method, simulation errors, for electromechanical transient simulation, caused by an electromagnetic side equivalent model can be effectively reduced, and particularly, the equivalent method has an effect of obviously improving the electromechanical transient simulation precision of an electromechanical side system during a failure.

Description

technical field [0001] The invention belongs to the technical field of electric power system simulation, and in particular relates to an equivalent method for electromagnetic and electromechanical transient mixed simulation electromagnetic side systems. Background technique [0002] As more and more high-power power electronic devices are widely used in modern power systems, especially in the development and construction of DC transmission projects, the traditional transient stability simulation technology can no longer meet the requirements of power system operation and control. Transient simulation can be divided into electromagnetic transient simulation for studying transient overvoltage, overcurrent, system harmonics and waveform distortion, and electromechanical transient simulation for studying dynamic behavior after power grid disturbance. Due to the shortcomings of a single simulation technology in the accurate simulation of large-scale systems, scholars at home and ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G06F9/455
Inventor 肖湘宁杨洋陈鹏伟房钊陶顺
Owner NORTH CHINA ELECTRIC POWER UNIV (BAODING)
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