Digital and analog mixed simulation system suitable for direct-current power grid

Abstract

The invention discloses a digital and analog mixed simulation system suitable for a direct-current power grid. The system comprises a digital side interface and a physical side interface, wherein the digital side interface is used for receiving a first signal from an A / D so that a digital simulation subsystem carries out digital simulation according to the first signal; the digital side interface outputs a second signal to a D / A; the D / A converts the second signal into a corresponding third signal and outputs the third signal to a control system; the control system receives the third signal and a fourth signal from a measuring unit, and carries out operation of tracking control according to the third signal and the fourth signal to generate a fifth signal; and the physical side interface is used for outputting direct-current power quantity according to the fifth signal so that a physical simulation subsystem carries out physical analog simulation according to the direct-current power quantity. According to an embodiment of the invention, the digital and analog mixed simulation system is suitable for digital and analog mixed real-time simulation of a direct-current power system.

Description

technical field [0001] The invention relates to the technical field of digital-analog hybrid real-time simulation of a power system, and more particularly relates to a digital-analog hybrid simulation system suitable for a DC power grid. Background technique [0002] In the power transmission link, with the continuous decline in the manufacturing cost of silicon-controlled converters, direct current transmission has been widely used. DC transmission systems have significant advantages in long-distance high-power transmission, submarine cable power transmission, interconnection between AC systems operating at different frequencies or asynchronously, limiting short-circuit current, and power transmission with new energy. In the power distribution link, distributed power supply and energy storage systems have been widely developed, power electronic equipment is widely used, and more and more DC loads or loads containing DC links are connected to the distribution network. The a...

AI Technical Summary

Problems solved by technology

[0007] Aiming at the defects of the prior art, the purpose of the present invention is to solve the problem that the AC interface system in the existing AC digital-analog hybrid simulation system is a three-phase main circuit structure, and outputs three-phase AC current, so that the digital simulation subsystem and the analog simulation cannot be completed. Technical Issues of DC-DC Conversion Between Subsystems

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