Hybrid compensation type inter-line power transfer device and control method thereof

Abstract

The invention provides a hybrid inter-line power transfer device. The hybrid inter-line power transfer device comprises two sets of series compensation devices; each set of series compensation devicescomprises at least one series transformer, a voltage source converter and at least one bypass switch; at least one set of series compensation devices comprises at least one reactor unit; the first side winding of the series transformer in each set of series compensation device is connected with the corresponding bypass switch in parallel and then is connected into a circuit in series; the secondside winding of the series transformer in each set of series compensation device is connected with the alternating current side of the voltage source converter, or the second side winding of the series transformer is connected with the reactor unit and then is connected with the alternating current side of the voltage source converter; and the direct current sides of the voltage source convertersof the two sets of series compensation devices are connected. The invention further provides a corresponding control method. According to the hybrid inter-line power transfer device provided by the technical schemes of the invention, the total capacity of the device can be reduced, and cost and occupied area are reduced. The hybrid inter-line power transfer device has a fault current limiting capacity, and therefore, can improve the reliability of the equipment.

Description

technical field [0001] The invention belongs to the technical field of flexible AC power transmission in a power system, and particularly relates to a compensator for power transfer between lines and a control method thereof. Background technique [0002] With the rapid development of the power system, with the increasing load, increasingly complex grid structure, large-scale access of new energy, uneven distribution of power flow, insufficient voltage support capacity, electromechanical oscillation and other problems are often intertwined, bringing new challenges to power grid operation control. challenge. Due to the saturation of transmission corridors and the commercialization of grid companies, it will be increasingly difficult to increase transmission capacity by building new transmission lines. The ever-increasing user load requires power flow control to improve the existing power delivery capacity; the complex power exchange between the booming smart grid and the ele...

AI Technical Summary

Problems solved by technology

In addition, the inter-line power transfer device scheme applied to the current multi-circuit line transmission channel requires the same number of voltage source converters as the number of lines, which occupies a large area and costs, and the control function is complicated.

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