Fault ride-through method for DC unipolar grounding in multi-terminal flexible HVDC transmission system
A high-voltage direct current, power transmission system technology, applied in the direction of converting AC power input to DC power output, output power conversion device, emergency protection circuit device for limiting overcurrent/overvoltage, etc., can solve the problem of transient overvoltage Continue to maintain the fault power transmission and other problems to achieve the effect of eliminating fault transient overvoltage, improving active defense, and fast restarting after fault
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example 1
[0132] The overhead line is used as the DC transmission line of the multi-terminal flexible HVDC transmission system. After detecting a single-pole ground fault, the MMC converter switches to the fault ride-through control mode: adjust the common mode command of the bridge arm reference signal of the faulty pole to be zero, the DC voltage command to be half of the rated value, and the active power command to be half of the rated value half. At the same time, by introducing the misphase angle γ between the differential mode component of the reference voltage of the upper bridge arm and the differential mode component of the reference voltage of the lower bridge arm, the balance of the capacitor voltage of the upper bridge arm sub-module and the balance of the capacitor voltage of the lower bridge arm sub-module are maintained, and The first additional reference voltage signal v is superimposed on the reference voltage of the faulty pole bridge arm zn1 , superimpose the second ...
example 2
[0145] The cable is used as the direct current transmission line of the multi-terminal flexible high voltage direct current transmission system. After detecting a single-pole ground fault, the MMC converter switches to the fault ride-through control mode: adjust the common mode command of the bridge arm reference signal of the faulty pole to be zero, the DC voltage command to be half of the rated value, and the active power command to be half of the rated value half. At the same time, the balance of the sub-module capacitor voltage between the upper and lower bridge arms is maintained by introducing the phase misalignment angle γ between the differential mode components of the reference voltage of the upper and lower arms, and the first additional reference voltage is superimposed on the reference voltage of the faulty pole arm signal v zn1 , superimpose the second additional reference signal v on the reference voltage of the sound pole arm zp1 . During the fault ride-throu...
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