Convertible unified power flow controller

Abstract

The invention provides a convertible unified power flow controller. The convertible unified power flow controller comprises at least one parallel transformer, three current converters, at least two series transformers, at least a group of alternating current switches and three groups of direct current switches, wherein at least one side of each series transformer is connected with at least one group of bypass switches in parallel, alternating current sides of the three current converters are connected into an alternating current system after connected with the at least one parallel transformer through parallel side switches, the two current converters on the series side are respectively connected with at least one group of the series transformers, and then are connected with a power transmission line in series, and direct current sides of the three current converters are connected with one another through the direct current switches. By adopting the structure, multiple running modes can be achieved, unified power flow controller functions of a single circuit can still be achieved when a random current converter breaks down, and simultaneously the convertible unified power flow controller is small in occupied area and low in cost, and has good economical efficiency, flexibility and reliability.

Description

technical field [0001] The invention relates to a flexible alternating current transmission technology, in particular to a convertible unified power flow controller. Background technique [0002] With the interconnection of large-scale power systems and the use of various new equipment, the scale and complexity of the power system have also increased while making power generation and transmission more economical and efficient; coupled with a large number of distributed power generation systems connected to the grid , so that the traditional fixed power flow transmitted from the transmission network to the distribution network is reversed; the continuous growth of user load requires power flow control means to improve the existing power transmission capacity; the complex power exchange between the booming smart grid and the power market requires Frequent flow control. [0003] The unified power flow controller, also known as UPFC (Unified Power Flow Controller), is the most ...

AI Technical Summary

Problems solved by technology

If a complete set of UPFC is installed in each circuit of the double circuit, each set of UPFC consists of a static synchronous compensator (including a parallel transformer and a parallel side converter) and a static synchronous series compensator (including a series transformer and a series-side converter), a total of four converters and four transformers are required, which occupies a relatively large area and the investment cost is relatively high

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