MMC real-time simulation design method based on FPGA and real-time simulator

Abstract

The invention discloses an MMC real-time simulation design method based on an FPGA, and the method comprises the steps: building an MMC real-time simulation model based on Thevenin equivalence in a real-time simulator based on the FPGA, wherein the FPGA-based real-time simulator comprises a bridge arm resolving unit and a sub-module resolving unit, the bridge arm resolving unit calculates historical current sources and currents of all bridge arms in the MMC under the current simulation step length, and the sub-module resolving unit calculates Thevenin equivalent voltage sources and Thevenin equivalent resistances of all sub-modules in the MMC under the current simulation step length, completes each time of real-time simulation according to the preset simulation step length, and outputs a simulation result of the MMC real-time simulation model when the current simulation moment reaches the preset simulation ending moment. The embodiment of the invention further discloses the real-time simulator based on the FPGA, real-time simulation of the MMC with the higher level number is achieved based on the FPGA, it can be guaranteed that the MMC model is efficiently and accurately solved, and the resource utilization rate of the real-time simulator is effectively increased.

Description

technical field [0001] The invention relates to the technical field of electrical system simulation, in particular to an FPGA-based MMC real-time simulation design method and a real-time simulator. Background technique [0002] With unique advantages such as low switching frequency, good harmonic characteristics, and strong scalability, MMC (Modular Multilevel Converter, Modular Multilevel Converter) has become the preferred topology of flexible DC transmission systems, and is widely used in domestic and foreign data A flexible DC project. The access of MMC makes the dynamic characteristics of the electrical system more complex, and the steady-state simulation analysis of the traditional power grid can no longer meet the needs. It is necessary to use fine transient simulation to deeply understand the operation mechanism and dynamic characteristics of the MMC system. [0003] Real-time simulation is still needed to realize fast electromagnetic transient simulation, especiall...

AI Technical Summary

Problems solved by technology

However, in the process of implementing the present invention, the inventors found that the prior art has at least the following problems: Due to the increase in the transmission voltage level of the electrical system, each bridge arm of the MMC in engineering applications is often formed by cascading hundreds of sub-modules, and each sub-module The module also contains several power electronic devices, resulting in hundreds of power electronic switches in the entire MMC, which makes the solution dimension of the system extremely large

Real-time simulators based on serial hardware such as conventional CPU processors or DSPs are limited by the processing speed and physical structure, and the ability to realize MMC real-time simulation calculations under a small simulation step size is relatively limited.

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