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An Equivalent Method of Electromagnetic and Electromechanical Transient Hybrid Simulation Electromagnetic Side System

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

Inactive Publication Date: 2018-01-19
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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  • An Equivalent Method of Electromagnetic and Electromechanical Transient Hybrid Simulation Electromagnetic Side System
  • An Equivalent Method of Electromagnetic and Electromechanical Transient Hybrid Simulation Electromagnetic Side System
  • An Equivalent Method of 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 with 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 electromagnetic and electromechanical transient mixed simulation electromagnetic side system equivalent method, which belongs to the technical field of power system simulation. The method is suitable for commercial electromagnetic transient simulation platforms; it includes the steps of: extracting the positive-sequence phasor of voltage fundamental wave and the positive-sequence phasor of fundamental wave of current at each interface bus; calculating the active power P and Reactive power Q; transfer P, Q, interface positive sequence voltage amplitude U, and phase angle difference between each interface voltage as the equivalent information at interface k to the electromechanical transient simulation platform; construct the corresponding iterative coefficient matrix, and use Iterative calculation of node voltage for electromechanical transient simulation. This method can effectively reduce the simulation error brought by the equivalent model of the electromagnetic side to the electromechanical transient simulation, especially to significantly improve the accuracy of the electromechanical transient simulation of the electromechanical side system during a fault.

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 Patents(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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