Journal
IEEE TRANSACTIONS ON POWER ELECTRONICS
Volume 34, Issue 11, Pages 10557-10574Publisher
IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC
DOI: 10.1109/TPEL.2019.2899651
Keywords
Electromagnetic transients (EMTs); hybrid multi-domain transmission-line mode (HMD-TLM); multi-domain co-simulation; multi-terminal dc (MTDC) grid; shifted-frequency dynamic phasor (SFP) model
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Funding
- National Key Research and Development Program of China [2017YFB0902800]
- National Natural Science Foundation of China [51737007]
- Science and Technology Project of State Grid [SGXJ0000KXJS1700841]
- SJTU Global Strategic Partnership Fund
- Shanghai Sailing Program [19YF1423500]
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To accurately capture the dynamics of a large-scale ac/dc system as a whole and the interactions between its individual components, a simulation method with high precision and efficiency is in great demand. For this purpose, we develop a multi-domain co-simulation method, in which the target system is partitioned into multiple dc and ac subsystems, represented by our proposed shifted-frequency phasor (SFP) models and the traditional EMT models, respectively. SFP models can be simulated with a much larger time step, leading to a significant improvement in simulation efficiency under a given requirement of precision. Further, a new interface model, namely, hybrid multi-domain transmission-line model (HMD-TLM), is developed to reflect the interactions between SFP models and EMT models, with the additional benefit of producing instantaneous and phasor waveforms simultaneously. Thus, the multi-domain co-simulation is implemented based on the efficient SFP models, the HMD-TLM, and a designed time sequences of simulation. The performance (efficiency and accuracy) of the proposed method has been validated on the well-known CIGRE ac/dc system as well as a practical system integrating large ac grids and modular-multilevel-converter-based multi-terminal dc grids.
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