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Converter overvoltage protection system and parameter design method of unified power flow controller

A power flow controller and parameter design technology, which is applied in the direction of emergency protection circuit devices for limiting overcurrent/overvoltage, AC network circuits, emergency protection circuit devices, etc., can solve the problem of high overvoltage protection level of arresters, converter Problems such as manufacturing difficulty and manufacturing cost increase, to achieve the effect of ensuring safe and economical operation, reducing the overvoltage level of the converter, and reducing costs

Active Publication Date: 2022-06-28
NR ELECTRIC CO LTD +2
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Problems solved by technology

[0004] The existing overvoltage protection method for the converter of the unified power flow controller is to use a gapless zinc oxide arrester connected in parallel on the AC side of the converter and on the valve side of the series transformer, and the arrester connected in parallel on the valve side of the series transformer is also connected in parallel with a fast bypass switch , this protection method usually uses the voltage and current nonlinear characteristics of the zinc oxide arrester to limit the voltage between the converter valve terminals caused by the fault of the AC system, but the parameters of the gapless zinc oxide arrester in this method are controlled by the unified power flow. In the case of a DC side fault, The limitation of the overcurrent of the inverter and the high level of overvoltage protection of the arrester lead to a great increase in the manufacturing difficulty and cost of the inverter

Method used

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  • Converter overvoltage protection system and parameter design method of unified power flow controller
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  • Converter overvoltage protection system and parameter design method of unified power flow controller

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Embodiment Construction

[0031] The technical solutions and beneficial effects of the present invention will be described in detail below with reference to the accompanying drawings.

[0032] like figure 2 As shown, the present invention provides a converter overvoltage protection system with a unified power flow controller, which is suitable for figure 1 In the unified power flow controller shown, the converter is a three-phase six-arm structure, including a converter valve 1 and a bridge arm reactor 2. The converter valve 1 adopts a modular multi-level structure, and the sub-module adopts a half-bridge Sub-module; the converter is connected to the series transformer 8 by connecting the copper bar 5, and the other end of the series transformer 8 is connected to the AC line.

[0033] The overvoltage protection system includes a surge arrester I 3, a surge arrester II 4, a surge arrester III 6, a thyristor bypass switch 10, a bypass circuit breaker 11 and a monitoring device, wherein one end of the s...

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Abstract

The invention discloses a converter overvoltage protection system and a parameter design method of a unified power flow controller. The system includes first to third arresters, a thyristor bypass switch, a bypass circuit breaker and a monitoring device, wherein the second arrester One end is grounded through the first surge arrester, the other end is connected to the connection line between the converter valve and the bridge arm reactor, and the thyristor bypass switch is connected in parallel with the second surge arrester; the third surge arrester is connected in parallel with the connecting copper bar, using a star connection, And its neutral point is connected to the neutral point of the series transformer and grounded through the grounding resistance; the bypass circuit breaker is connected in parallel to the line side of the series transformer; the monitoring module is used to monitor the status of the converter valve, thyristor bypass switch and bypass circuit breaker Monitoring and control, when the converter valve is detected to be blocked, the bypass thyristor is controlled to be turned on, and the bypass circuit breaker is closed at the same time. This technical solution can effectively reduce the overvoltage protection level of the converter, and greatly improve the economy and reliability of the converter.

Description

technical field [0001] The invention belongs to the field of flexible AC power transmission, and particularly relates to a converter overvoltage protection system for a unified power flow controller and a parameter design method thereof. Background technique [0002] The modern power system has gradually evolved into a large-scale AC-DC hybrid power grid. The problems of unbalanced distribution of load and power generation within the power grid and large differences in the distribution of power flow in transmission channels have become increasingly prominent. The problems of heavy and light loads in transmission channels exist simultaneously. Limited by the bearing capacity of the heavy-duty channel, it is difficult to use the transmission channel in the power grid very effectively. At the same time, due to the restrictions of urban planning, the difficulty of line reconstruction and power grid expansion is increasing, and the reliable and economical operation of the transmi...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02M1/32H02H9/04H02J3/00
CPCH02M1/32H02H9/04H02J3/00
Inventor 刘永刚陶风波王新宝谢天喜常宝立徐阳王真
Owner NR ELECTRIC CO LTD
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