Method for expanding MMC-HVDC model simulation scale under RTDS

Abstract

The invention discloses a method for expanding modular multilevel converter based high voltage direct current (MMC-HVDC) model simulation scale under a real time digital simulator (RTDS) in the technical field of power system multilevel distribution simulation. The method comprises the following steps of: simulating three phase bridge arms of a modular multilevel converter (MMC) by six multi-bridge series modules of the RTDS; placing two multi-bridge series modules which simulates an in-phase bridge arm of the MMC in the same small step-length module; connecting the direct current sides of the three phase bridge arms, positioned in different small step-length modules, of the MMC by using a small step-length circuit model in the RTDS; establishing an alternating current system in the RTDS; connecting the rectifier side and the inverter side of the MMC by utilizing the small step-length circuit model; and respectively performing simulation computation on the rectifier side and the inverter side of the MMC by utilizing two computing communication units in the RTDS. By using the method, the problem of limited simulation scale of the MMC-HVDC under the RTDS is solved.

Description

Method of enlarging the simulation scale of MMC-HVDC model under RTDS technical field The invention belongs to the technical field of multi-level distribution simulation technology of electric power system, and in particular relates to a method for enlarging the simulation scale of MMC-HVDC model under RTDS. Background technique Modular Multilevel Converter Based High Voltage Direct Current (MMC-HVDC or MMC for short) is an important branch of Voltage Source Converter Based High Voltage Direct Current (VSC-HVDC) in the multilevel field. As shown in Figure 1, compared with traditional DC transmission, VSC-HVDC has the following main advantages: (1) It does not need commutation current from the AC system at the receiving end, and can supply power to the passive network. (2) Fast and independent control of active power and reactive power can be realized, and four-quadrant operation can be realized for active power and reactive power. (3) It can provide fast reactive powe...

AI Technical Summary

Problems solved by technology

The purpose of the present invention is to propose a method for enlarging the simulation scale of the MMC-HVDC model under RTDS to solve the problem that the scale of the MMC-HVDC model simulation under RTDS is currently limited.

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