Device and method for controlling fault ride-through of power grid of flexible direct-current transmission system
A technology of power transmission system and flexible DC, which is applied in the field of power transmission and transformation, can solve problems such as the failure to improve the level of DC fault ride-through of flexible DC and DC bus voltage fluctuations, so as to improve the ability of AC fault ride-through, avoid equipment lock-up, reduce The effect of small fault currents
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[0028] The specific implementation of the present invention will be further described below in conjunction with the accompanying drawings.
[0029] In this implementation mode, the transmission capacity of the flexible DC transmission system is 100MW, and the DC bus voltage is ±220KV, such as figure 1 As shown, the flexible direct current transmission system power grid fault ride-through control device of this embodiment includes a switchable braking resistor unit 1, a power voltage adjustment unit 2, a full-bridge braking unit 3, a detection unit 4 and a control unit 5; the device is connected to To the flexible DC transmission system, the system includes a three-phase grid 8, a rectifier terminal 6 and an inverter terminal 7;
[0030] The switchable braking resistor unit 1 is connected in series on the DC bus of the inverter terminal 7 of the flexible DC transmission system, the power voltage regulation unit 2 is connected in parallel on the DC bus of the inverter terminal 7...
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