A DC short-circuit fault ride-through control method and related device

Abstract

The present application discloses a DC short-circuit fault ride-through control method and related devices, including breaking the DC circuit breaker on the island side in the faulty pole to remove the fault; The transmitted active power determines the type of power transfer condition; if the type of power transfer condition is self-consumption condition, control the island-side converter station in the non-faulty pole to increase the output power to pass the non-faulty pole after the fault is removed. The middle-island-side converter station transfers all the active power of the island-side converter station in the faulty pole; if the power transfer condition type is non-self-consumption condition, control the non-faulty-pole middle-island-side converter station to run at full power and control the wind farm to increase the load, so as to pass all the active power of the converter station on the island side in the non-faulty pole and the converter station on the island side in the fault pole of the wind farm after the fault is removed. This method can effectively reduce the fault influence range and maintain the power balance of the islanded system.

Description

technical field [0001] The present application relates to the technical field of flexible direct current power transmission, and in particular, to a method; it also relates to an apparatus, a device, and a computer-readable storage medium. Background technique [0002] Due to the increase in power consumption of power grids in isolated islands such as offshore islands and urban centers, it is difficult for the supporting power supply of isolated islands to meet the growing demand for electricity in the island. The Modular Multilevel Converter based High Voltage Direct Current (MMC-HVDC) system based on modular multilevel converter station adopts fully controlled power electronic devices, which can realize the autonomous shutdown of the device and have independent control of active and reactive power. It has the advantages of dynamic compensation for AC reactive power shortage and supporting AC voltage, and has the ability to supply power to passive islands. Therefore, MMC-HV...

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Problems solved by technology

In addition, the control strategy for the mutual conversion of MMC-HVDC between the networked and islanded operation states mainly includes the droop control strategy without switching. To withstand the short-circuit fault again in the island operation state; and the general control strategy of MMC-HVDC networking and island operation, by limiting the frequency command value and the inner loop current controller to achieve the purpose of improving the fault ride-through capability of the island system

[0004] However, the above-mentioned control strategies are all from the perspective of the converter station itself to improve the operation stability of the island system, without considering the coordination and cooperation among the various supporting equipment in the system, especially the research on DC short-circuit fault ride-through is blank

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