Reactive power balance system between 35kV alternating current buses based on flexible direct current technology

Abstract

The invention discloses a reactive power balance system between 35kV alternating current buses based on a flexible direct current technology. The reactive power balance system between the 35kV alternating current buses based on the flexible direct current technology comprises a bus section I and a bus section II, a control circuit is connected in series between each phase of the two bus sections,the control circuit comprises two branches connected in parallel, and one branch comprises a first inductor, N MMC modules and a second inductor which are sequentially connected in series. According to the invention, the capacity configuration of the two reactive power compensation devices under the power distribution network segmentation and segmentation operation conditions is optimized, and thesystem construction cost is reduced. Meanwhile, a multi-terminal flexible interconnection energy bidirectional flow control method is adopted, the output reactive power of the reactive power compensation devices connected with the two buses is allocated in real time by controlling a flexible interconnection modular multilevel circuit, the utilization rate of the reactive power compensation devices is increased, and active reactive power balance between the reactive power compensation devices of the power distribution network is achieved.

Description

technical field [0001] The invention discloses a reactive power balancing system between 35kV AC buses based on flexible DC technology, and relates to the technical field of smart grids. Background technique [0002] When there are two sections of busbars in the 35kV and below distribution network, they are generally operated in sections, and each section of busbars is equipped with a set of static var compensation devices. The static var compensation device configured in sections in the distribution network can continuously adjust its reactive power output in real time to realize the control of the bus voltage at the grid-connected point. In the segmental operation mode of the distribution network, the two busbars operate independently and the tie lines between the segments are disconnected. However, the two busbars of the distribution network will not work under the maximum load capacity in most cases, because the static var The capacity of the compensation device is conf...

AI Technical Summary

Problems solved by technology

In the segmental operation mode of the distribution network, the two busbars operate independently and the tie lines between the segments are disconnected. However, the two busbars of the distribution network will not work under the maximum load capacity in most cases, because the static var The capacity of the compensation device is configured according to the maximum load, thus increasing the cost of system construction and causing idle power compensation devices

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