High-voltage DC transmission conversion transient low-voltage test method and circuit thereof

A high-voltage direct current transmission and test circuit technology, which is applied in the direction of circuit breaker testing, measuring electricity, measuring electrical variables, etc.

Active Publication Date: 2014-03-26
XJ ELECTRIC +1
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0015] The purpose of the present invention is to provide a high-voltage direct current transmission commutation transient low voltage test method to solve the problems caused by the existing test methods

Method used

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  • High-voltage DC transmission conversion transient low-voltage test method and circuit thereof
  • High-voltage DC transmission conversion transient low-voltage test method and circuit thereof
  • High-voltage DC transmission conversion transient low-voltage test method and circuit thereof

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Embodiment Construction

[0028] The present invention will be further introduced below in combination with specific implementation modes.

[0029] Such as figure 2 Shown is the schematic diagram of the circuit structure of the transient low voltage test method of the HVDC converter valve of the present invention, the main equipment includes a high voltage voltage source, a low voltage current source, a capacitor Cs, the first auxiliary control valve Da3 and the second auxiliary control valve Da4, high-voltage isolation valve Daux, commutation reactance Lc, sample valve Vt, loop resistance R and capacitance C. The specific connection method is: the positive and negative electrodes of the high-voltage voltage source are connected in series with the auxiliary control valve Da3 and the commutation reactance Lc, and the test valve Vt is connected in series to form the flow circuit of the test valve; the auxiliary control valve Da3 Auxiliary control valve Da4 is connected in reverse at both ends, and a sh...

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PUM

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Abstract

The invention relates to a high-voltage DC transmission conversion transient low-voltage test method and a circuit thereof. The circuit comprises a high-voltage current source and a high-voltage voltage source; a first auxiliary control valve and a commutation reactor are sequentially connected in series between the anode and cathode of the high-voltage voltage source, and then connected in series with a test valve to form a through-flow loop of the test valve; the two ends of the first auxiliary control valve are reversely connected in parallel with a second auxiliary control valve; the two ends of the high-voltage voltage source are connected in parallel with an oscillation capacitor; the two ends of the test valve are connected in parallel with the low-voltage current source; a high-voltage isolation valve is connected in series between the anode of the low-voltage current source and the test valve; and the first and second auxiliary control valves are connected in parallel with a voltage division loop consisting of a voltage division resistor and a voltage division capacitor. In the invention, the auxiliary control valves are connected in parallel with the voltage division loop consisting of a resistor and a capacitor, and the transient low voltage on the test valve is realized when the positive voltage is built on the test valve; and the voltage stress characteristics during the transient operation of the DC transmission conversion valve can be really reflected.

Description

technical field [0001] The invention relates to the field of electric power systems of direct current transmission, and more specifically relates to a high-voltage direct current transmission commutation transient low voltage test method and a circuit thereof. Background technique [0002] HVDC transmission is a new type of power transmission developed in the 1950s. At present, there are about 100 DC transmission projects in the world, and there are more than 10 DC transmission projects in my country, with a total capacity of more than 18GW and a total transmission distance of more than 7000km. This has brought China's power grid into an era of AC and DC complementarity. The continuous progress of DC transmission technology and its superiority in the development of large power grids have made my country's power grid face an unprecedented development situation. Since DC transmission has the characteristics of long transmission distance, large transmission capacity, and flexib...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01R31/00G01R31/327
Inventor 常忠廷张建甘江华胡四全范彩云阮卫华胡永雄段艳丽
Owner XJ ELECTRIC
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