System and method for testing sub-synchronous oscillation suppression of SVG (Static Var Generator) based on RTDS (Real Time Digital Simulator)

Abstract

The embodiment of the invention provides a system for testing sub-synchronous oscillation suppression of an SVG (Static Var Generator) based on an RTDS (Real Time Digital Simulator). The system comprises an RTDS, a power amplifier, an optical-electrical converter, an SVG controller and control equipment, and is characterized in that the RTDS comprises a GTAO board card used for analog signal output, a GTDI / DO board card used for digital signal input and output, a control interface board card used for communication and a processor board card; the power amplifier is connected with the GTAO board card and used for receiving analog signals outputted by the GTAO board card, amplifying the analog signals and outputting the amplified analog signals; the optical-electrical converter is applied to conversion between optical signals and electrical signals; the SVG controller is connected with the power amplifier and the optical-electrical converter, and controls the operating state of the SVG; and the control equipment is connected with the control interface board card, communicates with the processor board card through the control interface board card, and is used for building a simulation power grid model so as to test sub-synchronous oscillation suppression of the SVG. The technical scheme provided by the embodiment of the invention can verify a suppression effect of the SVG for sub-synchronous oscillation under the condition that the SVG is not connected to the actual power grid.

Description

technical field [0001] Embodiments of the present invention relate to the field of subsynchronous oscillation testing in power systems, and in particular to an RTDS-based SVG suppression subsynchronous oscillation testing system and method. Background technique [0002] In high-voltage or ultra-high-voltage long-distance transmission systems, in order to increase the transmission capacity of the system and improve the stability of the system, series capacitor compensation technology is usually used, but at the same time it will also bring the risk of subsynchronous oscillation. [0003] As a new type of power electronic equipment, SVG (Static Var Generator) can inject specified frequency current into the power system, improve the transient characteristics and steady-state characteristics of the system, and have an inhibitory effect on the subsynchronous oscillation of the power system. , has been widely used in power systems in recent years. [0004] However, the suppressio...

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Problems solved by technology

[0004] However, the suppression effect of SVG can only be verified in the actual power grid system. If the suppression effect of SVG is not good, it will cause damage to the power grid, and there is a certain risk

Therefore, the defect in the existing technology is that there is no test system and method for SVG suppression of subsynchronous oscillation, which can verify the suppression effect of SVG on subsynchronous oscillation when the SVG is not connected to the actual power grid.

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