Unified power flow controller and control method thereof

Abstract

The invention discloses a unified power flow controller. The unified power flow controller comprises a plurality of series side converters, a plurality of transformers connected in series, a plurality of primary side winding by-pass switches, a parallel side converter, a parallel transformer and a wire incoming switch. The alternating-current ends of all the series side converters are connected with corresponding secondary side windings of the transformers connected in series, primary side windings of the transformers connected in series are connected with the corresponding primary side winding by-pass switches in parallel, and the primary side winding by-pass switches are connected into corresponding circuits in series. The direct-current ends of all the series side converters are connected in parallel and jointly connected with the direct-current end of the parallel side converter, the alternating-current end of the parallel side converter is connected with one end of the parallel transformer, and the other end of the parallel transformer is connected with an alternating-current bus of a multi-loop circuit through the wire incoming switch. The topological structure can achieve multiple operation modes and save a plurality of parallel side converters and transformers, has good economical efficiency and flexibility. The invention further discloses a control method of the unified power flow controller.

Description

technical field [0001] The invention relates to a flexible AC power transmission technology, in particular to a unified power flow controller applied to multiple circuits or lines and a control method thereof. 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 (...

AI Technical Summary

Problems solved by technology

If a complete set of UPFC is installed on each of N circuits or N lines (N is a natural number), 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) is connected, requiring a total of 2N converters and 2N transformers, which occupies a relatively large area and requires a relatively large investment

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