Series compensation device

Abstract

The invention discloses a series compensation device. The device comprises at least two voltage source current converters, at least two three-phase transformers, and at least one three-phase electric reactor; the voltage source current converters are connected to a multi-loop line in series through the three-phase transformers, and the AC sides of the voltage source current converters are connected with one another through the three-phase electric reactors, thereby realizing the function of equally dividing system flow by the plurality of current converters. The device scheme provided by the application can be independently installed in a power transmission system to be used as a static synchronous series compensator, and can also be used as a component of a unified flow controller, a convertible static compensator, an inter-line flow controller and a unified power quality regulator to be connected to a power transmission system device in series. The device is capable of saving the capacity of the current converters, the application efficiency of the series compensation device is improved, and the cost and the floor area are reduced.

Description

technical field [0001] The invention relates to the field of flexible alternating current transmission, in particular to a series compensation device. Background technique [0002] The equipment of flexible AC transmission system (FACTS) can be divided into series compensation device, parallel compensation device and comprehensive control device. Among them, the parallel compensation device can be directly connected to various levels of power grids, and the series compensation device and the comprehensive control device need to be connected to the power grid in series at one end, so the reliability, flexibility and safety of the device need to be integrated to study its connection mode. [0003] Among series compensation devices and integrated control devices, Static Synchronous Series Compensator (SSSC), Unified Power Flow Controller (UPFC), Interline Power Flow Controller (IPFC) and Switchable Static Compensator (CSC) can all improve the power transmission capacity of the ...

AI Technical Summary

Problems solved by technology

In most cases, the total operating current of the double-circuit lines is far less than the sum of the current ratings of the double-circuit lines. The above scheme causes a serious waste of capacity during normal operation, which will inevitably increase the investment cost and floor area, and at the same time reduce the overall loss. increase

For power grids with more circuit structures, cost, land occupation and equipment loss will further limit the application of series compensation devices

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