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High-voltage direct-current (DC) transformer and control method thereof

A technology of high-voltage DC and transformers, which is applied in the direction of converting DC power input to DC power output, control/regulation systems, instruments, etc., and can solve problems such as low system reliability and difficulty in realizing redundant operation of main circuit failures, so as to improve reliability sexual effect

Active Publication Date: 2014-03-12
INST OF ELECTRICAL ENG CHINESE ACAD OF SCI +1
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Problems solved by technology

[0005] The purpose of the present invention is to overcome the shortcomings of the existing HVDC power distribution system high-voltage direct current transformer that it is difficult to realize the redundant operation of the main circuit failure, which leads to low system reliability, and propose a high-voltage direct current transformer and its control method

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  • High-voltage direct-current (DC) transformer and control method thereof

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[0017] Taking a 16kV / 750V high-voltage DC transformer as an example to further illustrate the specific implementation of the present invention: the high-voltage DC voltage is 16kV, the low-voltage DC voltage is 750V, and contains 18 isolated low-voltage DC-DC converters, that is, N=18 ;Set 2 redundant isolated low-voltage DC-DC converters, that is, R=2; and assume that the control period of the isolated low-voltage DC-DC converter is 1 / 10kHz=0.1ms, then:

[0018] (1) Under normal circumstances, the high-voltage side mechanical bypass switches K of 18 isolated low-voltage DC-DC converters 1 are in the off state, and its low-voltage side mechanical bypass switch K 2 They are all in the closed state, and in any 0.1ms control cycle, there are always only 16 high-voltage side capacitors of the isolated low-voltage DC-DC converter connected in series on the high-voltage DC side, and the voltage on each capacitor is 16kV / 16 =1000V; and the high voltage side of the remaining two isol...

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Abstract

The invention relates to a high-voltage direct-current (DC) transformer and a control method thereof. The high-voltage DC transformer comprises N isolation type low-voltage DC-DC converters. The high-voltage side of each low-voltage DC-DC converter comprises a first mechanical bypass switch (K1), and the low-voltage side thereof comprises a second mechanical bypass switch (K2). During normal operation, a control system allows R isolation type low-voltage DC-DC converters to be in the redundancy state and the rest N-R isolation type low-voltage DC-DC converters to be in the normal state, wherein 0<R<N. When one optional isolation type low-voltage DC-DC converter inside fails, the first mechanical bypass switch (K1) on the high-voltage side of the converter is switched on, and second mechanical bypass switch (K2) on the low-voltage side of the converter is switched off. Regardless of whether the internal circuit fails or not, only N-R isolation type low-voltage DC-DC converters bear high DC voltage, and voltage input and output are not affected when some parts of the circuit is bypassed.

Description

technical field [0001] The invention relates to a highly reliable high-voltage direct current transformer and a control method thereof in the field of high-voltage direct current (above 10kV) power transmission and distribution. Background technique [0002] High Voltage Direct Current (HVDC) technology above 10kV is usually applied to transmit high-power electric energy from a long-distance power plant to electrical equipment, and the transmission line can be an overhead line or a submarine cable. HVDC technology can also be used to connect two separate grids when traditional AC interconnection solutions are not feasible. Generally HVDC transmission system has lower cost and higher efficiency than AC transmission system. In AC transmission systems, mains power can be tapped to loads through power transformers along the power transmission line. However, for the HVDC transmission system, since the power transformer cannot transmit DC power, it is generally necessary to esta...

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Application Information

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IPC IPC(8): H02H7/05H02M3/315
Inventor 李子欣王平李耀华高范强徐飞楚遵方孙湛冬
Owner INST OF ELECTRICAL ENG CHINESE ACAD OF SCI
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