Current source-type uninterrupted power switch for AC power distribution system

Abstract

The invention relates to a current source-type uninterrupted power switch for an AC power distribution system, and belongs to the technical field of combination of power electronics and a power distribution technology. The current source-type uninterrupted power switch comprises low-capacity CSCs, a high-capacity CSC, an electronic switch and a controller, wherein DC sides of the low-capacity CSCs are mutually connected through a DC bus of the power switch; DC outlets of the low-capacity CSCs are connected with hybrid DC change-over switches in parallel; an AC side of the high-capacity CSC is connected with one end of the electronic switch through an AC circuit breaker, the DC side is connected with the DC bus in series and the DC outlet is connected with the hybrid DC change-over switches in parallel; the other end of the electronic switch is connected with an AC substation; and the controller is connected with the electronic switch, the low-capacity CSCs and the high-capacity CSC through signal lines separately. According to the power switch, the utilization efficiency of a single main transformer is improved; the total capacity of the current source converter stations is reduced; the overall loss of the system is reduced; the overall investment quota of equipment is reduced; and the overall system more economically and reliably runs.

Description

technical field [0001] The invention relates to a current source type uninterrupted power converter for an AC power distribution system, which belongs to the technical field of combining power electronics and power distribution technology. Background technique [0002] In recent years, with the continuous expansion of city scale and the rapid increase of power load, the requirements for power quality, power supply reliability and transmission capacity of power distribution network are also increasing. In response to these requirements, there are two main ideas for the development of the distribution network: 1) develop distributed power sources and supporting facilities to reduce the pressure on the distribution network; 2) strengthen the construction of the distribution network and increase the utilization rate of distribution equipment. At present, many experts and scholars are studying the flexible access of distributed power sources. Common distributed power sources main...

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Problems solved by technology

[0005] The purpose of the present invention is to propose a current source type uninterruptible power exchanger for AC power distribution system, aiming at the problems of large backup capacity of the main transformer and low utilization rate of equipment in the existing AC power distribution system, from the power distribution system In terms of network construction, a current source uninterruptible power converter (hereinafter referred to as CSC-UPH) for AC power distribution system is proposed to effectively reduce the backup capacity of the main transformer, improve the utilization rate of power distribution network equipment, and realize the system N- 1 Uninterrupted power supply under failure, and realize active optimization control of system power flow, improve power supply quality and perform flexible reactive power compensation when the AC system fails

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