Flexible arc extinguishing converter with additional reactive compensation, and control method thereof

Abstract

The embodiment of the invention provides a flexible arc extinguishing converter with additional reactive compensation, and a control method thereof. The flexible arc extinguishing converter with additional reactive compensation comprises a DC/AC converter, an AC/DC converter and an integrated controller, wherein the AC side of the DC/AC converter is boosted by a single-phase transformer of a powerdistribution network system and then is connected to the neutral point of the power distribution network system, and is used for outputting a specific AC voltage vector to realize grounding arc extinction of the power distribution network system, the DC sides of the AC/DC converter and the DC/AC converter are interconnected to form a DC bus, the AC side of the AC/DC converter is connected to a station transformer power supply and is used for controlling the voltage of the DC bus to be constant and performing reactive compensation on the station transformer power supply, the reactive power isdynamically adjusted along with the output voltage and current information of the DC/AC converter, and the comprehensive controller performs information acquisition, controls logic operation and sendsa control command to the AC/DC converter and the DC/AC converter.

Description

technical field [0001] The present application relates to the technical field of application of power electronic equipment in power systems, in particular to a flexible arc-suppression converter with additional reactive power compensation and a control method thereof. Background technique [0002] With the rapid development of the urban distribution network, the power supply lines in the distribution network are increasing and lengthening year by year, resulting in an increase in the capacitive current of the system to the ground, resulting in a grounding arc in the system when a single-phase grounding occurs, endangering personal safety. In addition, the diversification of load forms leads to an increasing demand for reactive power in the distribution network. [0003] At present, the scheme of using power electronic equipment to achieve flexible arc suppression has gradually become a research hotspot in the industry due to its advantages of rapidity, accuracy, and flexibil...

AI Technical Summary

Problems solved by technology

In the no-fault stage, this scheme cannot realize the reactive power compensation function. Since the time of ground fault occurrence is relatively short compared with the full-cycle operation time, the utilization rate of this scheme is extremely poor. Configuring reactive power compensation equipment alone will increase equipment investment and occupy an area demand will also increase

"A voltage control method for active arc suppression devices in distribution networks" (Patent No. 20171022276.X) discloses a new type of arc suppression compensation device, which uses power electronic equipment to compensate a specific voltage vector at the neutral point of the power grid to achieve arc suppression. However, the device cannot realize the reactive power compensation function of the system

[0004] The reactive power com

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