Abstract
For the problem of poor accuracy of the existing multi-rate simulation methods, this paper proposes a multi-rate real-time simulation method based on the Norton equivalent, compared with multi-rate simulation method based on the ideal source equivalent. After the Norton equivalence of the fast subsystem and the slow subsystem are established, they are solved simultaneously at the junction nodes. In order to reduce the amount of the simulation calculation, the Norton equivalent circuit is obtained by incremental calculation. The data interaction between the fast subsystem and the slow subsystem is realized by extrapolation method. For ensuring the real-time performance of the simulation, the method of the slow subsystem calculates ahead of the fast subsystem is given for the slow subsystem with a large amount of calculation. Finally, the AC/DC hybrid power system was simulated on the real-time simulation platform (FPGA-based Real-Time Digital Solver, FRTDS), and the simulation results were compared with the single-rate simulation, which verified the correctness and accuracy of the proposed method.
Highlights
China has built the world’s largest AC/DC hybrid power system with the highest voltage level, and the regional power grids have been interconnected through ultra-high voltage AC/DC transmission lines [1,2]
For the problem of poor accuracy of the existing multi-rate simulation methods, this paper proposes a multi-rate real-time simulation method based on the Norton equivalent, compared with multi-rate simulation method based on the ideal source equivalent
In order to reduce the amount of the simulation calculation, the Norton equivalent circuit is obtained by incremental calculation
Summary
(FPGA) has fully configurable configurable parallel distributed memory structure and deep pipeline structure, and has the advantages of distributed memory structure and deep pipeline structure, and has the advantages of low low cost cost and and size. advantages. Smart Grids of Tianjin University has developed a real-time digital solver based on FPGA (FRTDS). In order to to improve scripts, graphicalmodeling modelingtool toolforfor real-time simulation of power system developed. Scripts, aa graphical real-time simulation of power system has has beenbeen developed. Users only need to generate power system database with graphical modeling tools, and do not need simulation script can be further generated, which further reduces the workload of the researchers. FRTDS and the host computer, andneed the communication protocol is used between and the host computer, and the the capabilities of function of the host computer is to download the simulation program and set up the simulation. Aurora communication protocol of Xilinx is a scalable lightweight link layer protocol for moving data requirements, so they are used between and the real digital device. The FRTDS real-time simulation platform selects Xilinx’s Virtex-7 FPGA experimental controller.
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