Test system for transient step response of flexible direct-current electronic voltage transformer

A technology of voltage transformer and flexible DC, which is applied in the field of transient step response test system of flexible DC electronic voltage transformer, to achieve the effect of improving time scale accuracy, good transient characteristics and ensuring accuracy

Pending Publication Date: 2019-04-26
江苏凌创电气自动化股份有限公司
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Problems solved by technology

[0010] Purpose: In order to overcome the deficiencies in the existing technology, improve the reliability of the flexible direct current transmission system, and aim at the current technical status of the existing flexible direct current electronic voltage tra

Method used

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  • Test system for transient step response of flexible direct-current electronic voltage transformer
  • Test system for transient step response of flexible direct-current electronic voltage transformer
  • Test system for transient step response of flexible direct-current electronic voltage transformer

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Embodiment 1

[0038] High-power fully-controlled power electronic devices are used to control the output of the DC transient step voltage generator, a three-phase power frequency power supply is connected to a D / Y type converter, and a three-phase 6-pulse fully-controlled rectifier bridge is used to give High-voltage large-capacity capacitor matrix energy storage, accumulating the transient step electric energy required for the test. Through the cooperative control of the control valve in the discharge circuit and the rectifier bridge, the discharge control of high-voltage electric energy is carried out, and the transient step signal required for the test is formed on the primary side of the DC electronic voltage transformer under test.

[0039] The precision resistor divider uses metal foil precision resistors, and its resistance accuracy can reach 10 -6 , the temperature coefficient of resistance can reach ±0.3×10-6 / ℃, the distributed capacitance can be lower than 0.5pF, and the distribu...

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PUM

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Abstract

The invention relates to a test system for transient step response of a flexible direct-current electronic voltage transformer, wherein an EVT digital value receiving module is used for receiving a sample signal sent by a merging unit of a tested direct-current electronic voltage transformer, and a signal conditioning loop is used for sending a digital signal of a standard signal; a clock module is respectively used for controlling the standard signal and the sample signal to have an uniform time sequence and time scale; the synchronized standard signal and sample signal are processed by a step high value calculation module and a step low value calculation module; the stable direct current components of the standard signal and sample signal are processed by a 10% time calculation module and a 90% time calculation module; the output values of the 10% time calculation module and 90% time calculation module are input into a step response delay calculation module, and the step response delay calculation module is used for calculating the difference value of the time moments corresponding to the standard signal and the sample signal respectively. The system meets the requirement of flexible direct current transmission on the reliability of the flexible direct-current electronic voltage transformer.

Description

technical field [0001] The invention relates to a transient step response test system of a flexible DC electronic voltage transformer, which belongs to the technical field of flexible DC transmission testing. Background technique [0002] At present, with the rapid development of high-power full-control power electronic devices and the continuous improvement of the DC grid manufacturing level, the flexible DC transmission technology has received more and more attention and application in the field of high-voltage DC transmission, and will become an important part of the DC grid. The most important method of transmission. Compared with the AC system, the faults of the DC system develop faster, and the control and protection are more difficult. As the core measurement equipment in the flexible DC control and protection system, the electronic transformer is also facing higher technical and reliability requirements. [0003] The flexible DC electronic voltage transformers in o...

Claims

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Application Information

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IPC IPC(8): G01R35/02
CPCG01R35/02
Inventor 汤汉松
Owner 江苏凌创电气自动化股份有限公司
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