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Method applied in alternating current/direct current large power grid transient analysis of imitating direct current response

A transient analysis, AC and DC technology, applied in electrical components and other directions, can solve the problems of slow simulation speed, inaccurate simulation of commutation process and power changes, and analysis errors of transient stability of AC and DC interconnected large power grids. The effect of high degree, simple operation and fast calculation speed

Active Publication Date: 2013-05-08
ELECTRIC POWER RESEARCH INSTITUTE, CHINA SOUTHERN POWER GRID CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The simulation speed of the electromechanical transient simulation software is fast and can adapt to the analysis requirements of large-scale power grids; however, since the DC model used in the electromechanical transient simulation is a quasi-steady model, the commutation of DC when asymmetrical faults or harmonic voltages are involved The process and power changes cannot be accurately simulated, and there is also a lack of simulation of the converter transformer control reactive power compensation / voltage control and DC protection criteria, so the dynamic response simulation of the HVDC transmission system is not accurate enough
Electromagnetic transient simulation software can accurately simulate the dynamic characteristics of DC control and protection, but the simulation speed is slow, and it is difficult to adapt to the analysis requirements of large-scale power grids. big error

Method used

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  • Method applied in alternating current/direct current large power grid transient analysis of imitating direct current response
  • Method applied in alternating current/direct current large power grid transient analysis of imitating direct current response
  • Method applied in alternating current/direct current large power grid transient analysis of imitating direct current response

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Effect test

Embodiment 1

[0028] Step S3: When the fault in the electromechanical transient simulation prevents the bus voltage of the inverter station from falling below 90% of the voltage value before the fault, no matter whether the three-phase permanent grounding short-circuit fault of the line (referred to as the three-permanent fault) is correctly removed or the switch single If the phase refuses to move, the commutation failure of the DC system will not occur, and the DC is simulated by the model of the electromechanical transient simulation software itself.

Embodiment 2

[0030] Step S3: When the fault in the electromechanical transient simulation causes the bus voltage of the inverter station to drop below 90% of the voltage value before the fault, the response simulation of the DC power of the electromechanical transient simulation software is as follows: the DC power is reduced to 0 at the moment of the fault. , after the fault is cleared, the DC power command returns to the value before the fault. like figure 2 shown.

Embodiment 3

[0032] Step S3: If the single-phase switch of the three-permanent fault of the line refuses to operate, that is, when the three-permanent fault occurs, the bus voltage of the inverter station drops below 40% of the value before the fault, then the moment of the fault is considered while the AC system is faulty in the electromechanical transient simulation. The DC power is reduced to 0, and the DC power command returns to the value before the fault after 0.35s. like image 3 shown.

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Abstract

The invention discloses a method applied in alternating current / direct current large power grid transient analysis of imitating direct current response. Fault simulation is disposed in alternating current / direct current large power grid electromechanical transient simulation software. Faults are simulated in the power grid electromagnetic transient software, and contravariant station busbar voltage and the result of the electromechanical transient simulation software are in basic accordance. Power wave form of the direct current is simulated. The electromechanical transient simulation and differences of the direct current wave form simulated by the electromechanical transient simulation software are in comprehensive analysis under fault conditions. The faults are simulated in the electromechanical transient simulation software meanwhile a direct current power modification card is used for modifying a reference value of the direct current power. After the simulated comparison, power curve of the direct current is consistent with the trend of the electromagnetic transient simulation results. Multi-chapter direct currents are simulated. A system is in electromechanical transient stable simulation. The direct current transmission dynamic response is imitated to obtain systematical stable features of the alternating current / direct current. The method applied in the alternating current / direct current large power grid transient analysis of imitating the direct current response is easy to operate, quick in computation speed, high in accuracy degree and suitable for using in the alternating current / direct current interconnection big power grid electromechanical transient simulation analysis.

Description

technical field [0001] The invention belongs to the technical field of power system analysis, and more particularly, relates to a method for accurately simulating the response of a high-voltage direct-current transmission system in electromechanical transient simulation analysis of an AC-DC interconnected large power grid. Background technique [0002] In order to simulate and analyze the system stability of AC and DC interconnected large power grids and the interaction between AC and DC, it is necessary to comprehensively use electromechanical transient simulation software and electromagnetic transient simulation software. The simulation speed of the electromechanical transient simulation software is fast, which can meet the analysis requirements of large-scale power grids; however, due to the quasi-steady-state model of the DC model used in the electromechanical transient simulation, the commutation of DC in the event of asymmetric faults and harmonic voltages The process ...

Claims

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Application Information

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IPC IPC(8): H02J5/00
Inventor 赵勇洪潮金小明周保荣夏成军陈建斌杜斌赵利刚
Owner ELECTRIC POWER RESEARCH INSTITUTE, CHINA SOUTHERN POWER GRID CO LTD
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