Flexible direct-current transmission real-time simulation system and simulation method thereof

Abstract

The invention relates to a flexible direct-current transmission real-time simulation system and a simulation method thereof. The flexible direct-current transmission real-time simulation system comprises a real-time simulation platform, an A-set device and a B-set device. The A-set device comprises an A-set valve control device, an A-set valve control signal conversion device, an A-set converter valve control device, an A-set station control device, an A-set direct-current protection device, an A-set direct-current measurement and control device, an A-set alternating-current measurement and control device and a centralized wave recording device, wherein the real-time simulation platform is connected with the A-set valve control device through the A-set valve control signal conversion device, the A-set valve control device is connected with the A-set converter valve control device, the A-set converter valve control device is connected with the A-set station control device, and the real-time simulation platform is respectively connected with the A-set direct-current protection device, the A-set direct-current measurement and control device and the A-set alternating-current measurement and control device through a signal interface screen and connected with the centralized wave recording device. The B-set device and the A-set device are the same in composition and connected relation of the devices. According to the flexible direct-current transmission real-time simulation system, the steady state and transient characteristics of the flexible direct-current system can be precisely simulated.

Description

technical field [0001] The present invention relates to a flexible direct current transmission real-time simulation system and its simulation method, in particular to a flexible direct current transmission real-time simulation system and its simulation method based on a modular multilevel converter, belonging to a flexible direct current transmission real-time simulation system and its simulation method innovative technology. Background technique [0002] With the rapid development and engineering application of flexible DC transmission technology, it has become an application trend to construct a high-voltage / large-capacity flexible DC transmission system based on modular multilevel converters (MMC). With the increase of voltage level and capacity, the number of cascaded power modules in the bridge arm of the modular multilevel converter is also increasing. After the number of cascaded modules reaches hundreds, how to ensure the unit modules and control and protection devic...

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Problems solved by technology

[0004] In the MMC-based flexible direct current transmission topology, the trigger signals of each power module in a single bridge arm are different, and the measurement information of capacitor voltage and bridge arm current in thousands of power modules of the six bridge arms must be completed within a microsecond control period. Sending and receiving different control and protection commands provided by the valve control system for each converter power module, the existing method of transmitting electrical analog quantities through the I / O port is no longer suitable for this kind of flexible HVDC converter real-time simulation of

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