Hybrid cascade type direct-current fault ride-through system based on fault current limiter and control method
A DC fault ride-through and fault current limiter technology, applied in the direction of emergency protection circuit devices, electrical components, circuit devices for limiting overcurrent/overvoltage, etc., can solve the LCC commutation failure fault, MMC single-pole grounding fault Insufficient traversing ability and other problems, to achieve the effect of simple control, good recovery process and strong economy
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[0035] The present invention will be described in further detail below in conjunction with the accompanying drawings and specific embodiments.
[0036] The hybrid cascaded DC fault ride-through system based on the fault current limiter of the present invention includes multiple fault current limiters and their controllers. Between the DC inlets of the low-end MMCs at the cascaded DC receiving end.
[0037] When a commutation failure occurs in the high-end LCC of the hybrid cascaded DC receiving end, the fault current limiter controller detects that the DC current of the MMC reaches the fault current limiter start-up criterion current I set When the current limiting resistor is switched on, the DC fault current is suppressed to avoid the blocking of the MMC valve group.
[0038] When a single-pole ground fault occurs in a hybrid cascaded DC receiving-end low-end MMC, the fault current limiter uses its own topology to block the normal MMC and the discharge circuit of the faulty...
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