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
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[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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