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A control method and device for a hybrid direct current transmission system

A technology of hybrid DC power transmission and control method, which is applied in the direction of output power conversion device, conversion of AC power input to DC power output, conversion of AC power input to AC power output, etc., which can solve the problem of DC voltage drop and large impact of AC system, etc. problem, achieve the effect of avoiding power transmission interruption, simple and fast reversal

Active Publication Date: 2017-11-24
NR ELECTRIC CO LTD +1
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  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] There is a problem in the existing hybrid DC transmission system: when the AC system at the sending end where the LCC is located fails, especially a serious ground fault, the DC voltage output by the LCC will drop with the AC voltage
The impact on the connected AC system will be greater than commutation failure

Method used

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  • A control method and device for a hybrid direct current transmission system
  • A control method and device for a hybrid direct current transmission system
  • A control method and device for a hybrid direct current transmission system

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Embodiment Construction

[0024] The technical solutions of the present invention will be described in detail below in conjunction with the accompanying drawings and specific embodiments.

[0025] The hybrid direct current transmission system includes a rectifier converter station for connecting the AC grid at the sending end, an inverter converter station for connecting the AC grid at the receiving end, and a DC transmission line for connecting the rectifier converter station and the inverter converter station. The rectifier station is connected to the AC grid at the receiving end through a transformer, the rectifier station includes at least one set of current source converter units, and the inverse converter station includes at least one set of modular multilevel converter units.

[0026] Generally, the rectification converter station adopts the current source converter based on the thyristor device, and the current source converter can be a six-pulse bridge circuit, a twelve-pulse bridge circuit or ...

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Abstract

The invention discloses a control method and device for a hybrid direct current transmission system. The hybrid direct current transmission system adjusts the total number of input sub-modules and input sub-modules of a modular multilevel converter in real time according to the direct current voltage of a rectification station at the other end The polarity of the output level; or adjust the total number of input sub-modules of the modular multi-level converter and the polarity of the output level of the input sub-module in real time according to the magnitude of the DC current or DC power; or at the same time according to the DC current The total number of input sub-modules of the modular multilevel converter and the polarity of the output level of the input sub-modules are adjusted in real time according to the size of the input sub-module and the DC voltage of the rectification station at the other end. The method provided by the invention can effectively control the direct current voltage and direct current of the system, and avoid the interruption of the power transmission of the hybrid direct current transmission system.

Description

technical field [0001] The invention belongs to the field of direct current transmission, and relates to a control method and device applied in a direct current transmission system composed of a modular multilevel converter at least one end, in particular to a control method and device for a hybrid direct current transmission system. Background technique [0002] High-voltage direct current transmission technology can be divided into two categories: thyristor-based current source direct current transmission technology (LCC-HVDC), and flexible direct current transmission technology based on fully-controlled power electronic devices (VSC-HVDC). LCC-HVDC has low cost, low loss, and mature operation technology. At present, most of the operating DC transmission systems in the world are LCC-HVDC systems, but the current source DC transmission system (LCC-HVDC) has the possibility of easy switching of the inverter side. Phase failure, strong dependence on the AC system, absorbing a...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02J3/36
CPCH02J3/36Y02E60/60H02M1/32H02M7/483H02M5/4585H02M1/325H02M7/4835H02M7/5387H02M7/7575
Inventor 赵文强汪楠楠王永平鲁江柏传军卢宇
Owner NR ELECTRIC CO LTD
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