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Hybrid back-to-back direct-current power transmission device and fault processing method

A technology of direct current transmission and direct current voltage, which is applied in the direction of circuit devices, emergency protection circuit devices, and AC network circuits, etc. It can solve the problems of voltage exceeding the acceptable range and slow speed of power current regulators, etc., and achieves simple structure and prevents direct current voltage The effect of increasing and preventing the overvoltage of the capacitor

Active Publication Date: 2016-03-09
NR ELECTRIC CO LTD +1
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Problems solved by technology

But this method for figure 1 The direct current transmission device in is not applicable, figure 1 The rectification side of the DC transmission device shown is a current source converter, and the speed of its power current regulator is much slower than that of the flexible DC transmission device. By reducing the reference value of active power on the DC side, the DC voltage cannot be prevented in time. Further increase, the voltage on the DC side will still greatly exceed the acceptable range

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  • Hybrid back-to-back direct-current power transmission device and fault processing method
  • Hybrid back-to-back direct-current power transmission device and fault processing method
  • Hybrid back-to-back direct-current power transmission device and fault processing method

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Embodiment Construction

[0031] The technical scheme of the present invention will be described in further detail below in conjunction with the accompanying drawings and specific embodiments, so that those skilled in the art can better understand the present invention and implement it, but the examples given are not intended to limit the present invention.

[0032] A hybrid back-to-back DC power transmission device, including a DC power transmission device and a fault processing device, wherein the DC power transmission device is such as figure 1 As shown, it includes a current source converter based on a thyristor device for connecting to the AC grid at the sending end and a voltage source converter based on a fully-controlled power electronic device for connecting to the AC grid at the receiving end. figure 1 Among them, filtering and reactive power compensation devices are installed on the AC bus connected to the current source converter, and a smoothing reactor is installed between the current sour...

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Abstract

The invention discloses a hybrid back-to-back direct-current power transmission device and a fault processing method. The method comprises the following steps of: 1, collecting a direct voltage and a direct current of the direct-current power transmission device, an alternating voltage of an alternating power grid connected with a voltage source type converter, and a voltage of a voltage source type converter sub-module capacitor; 2, judging whether the direct-current power transmission device breaks down according to analog quantities collected in the step 1; and 3, if yes, changing the power transmitted by the voltage source type converter, and simultaneously changing the direct voltage generated by the voltage source type converter and / or the output alternating current. According to the invention, the direct current overvoltage problem caused when the alternating power grid connected with voltage source type converter at an inversion side in the direct-current power transmission device can be effectively solved, a direct-current bus and the sub-module capacitor are prevented against the overvoltage, the alternating fault is reliably crossed, and the safety of equipment is better protected.

Description

technical field [0001] The invention relates to a hybrid back-to-back DC power transmission device and a fault handling method, in particular to a DC power transmission device and a fault handling method which are composed of at least one end being a current source converter and one end being a voltage source converter. Background technique [0002] HVDC systems can be divided into two types: conventional DC transmission systems (LCC-HVDC) based on thyristor technology and flexible HVDC systems based on fully controlled power electronic device technology (Flexible-HVDC). Among them, the conventional direct current transmission system (LCC-HVDC) has low cost, low loss, and mature operation technology. The inverter side is prone to commutation failure, strong dependence on the AC system, absorbing a large amount of reactive power, and large area occupied by the converter station. The new generation of flexible direct current transmission system (Flexible-HVDC) can realize the...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02H7/26H02J3/00H02J3/36
CPCH02H7/262H02J3/00H02J3/36H02J3/001Y02E60/60
Inventor 赵文强王永平汪楠楠柏传军胡兆庆
Owner NR ELECTRIC CO LTD
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