Bridge type DC energy consumption device and control method

An energy-consuming device and control method technology, applied in circuit devices, emergency protection circuit devices, emergency protection circuit devices for limiting overcurrent/overvoltage, etc. Can not send and other problems, to enhance the ability to suppress the overvoltage of the DC line, reduce the risk of overvoltage, and save the effect of charging resistors
CN109546674APending Publication Date: 2019-03-29NR ELECTRIC CO LTD +1
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
NR ELECTRIC CO LTD
Publication Date
2019-03-29

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Abstract

The invention discloses a bridge type DC energy consumption device which comprises at least two bridge type energy consumption modules. Each bridge type energy consumption module is formed by connecting a DC capacitor, a first energy consumption branch and a second energy consumption branch in parallel. The first energy consumption branch is formed by connecting a first power semiconductor deviceand a first energy consumption resistor in series, and a connection point of the two is led out as a first lead-out end. The second energy consumption branch is formed by serially connecting a secondpower semiconductor device and a second energy consumption resistor, and a connecting point of the two is led out as a second lead-out end. The at least two bridge type energy consumption modules areconnected in series in the same direction to form the bridge type DC energy consumption device. The invention further discloses a control method based on the bridge type DC energy consumption device.When the voltage of a DC line rises, the power semiconductor device is controlled to control the on-off of the energy consumption resistor so as to stabilize the direct-current voltage. When the DC line is short-circuited, the first energy consumption resistor and the second energy consumption resistor are connected in series to limit the direct current capacitance current. The device is high in cost performance, high in reliability and easy to implement.
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Description

technical field

[0001] The invention belongs to the technical field of high-power electric current conversion, and in particular relates to a bridge-type DC energy consumption device and a control method. Background technique

[0002] In HVDC power transmission system, DC energy consumption device is a crucial equipment. DC energy consumption devices are mainly used in the application scenarios of new energy power generation and transmission. If the power generation end is an inertial power source similar to wind power, when the power receiving end fails, because the power cannot be sent out, the energy will be accumulated on the DC side, resulting in the failure of the DC transmission line. The voltage rise will cause harm to the safe operation of the equipment.

[0003] The commonly used technical solution in the prior art is to use power semiconductor devices, such as IGBT directly connected in series and a centralized resistance solution. The IGBT valve string is subjec...

Claims

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