Abstract
The design of control and protection system of the line-commutated converter (LCC) in a meticulous way should consider both dynamics of the LCC and large-scale ac grids. Consequently, a highly accurate and efficient simulation method is desirable. In order to capture the high-frequency dynamics between ac/dc grids, the multirate and mixed solver based cosimulation by combining transient stability (TS), shifted-frequency phasor (SFP), and electromagnetic transient (EMT) models is proposed. The idea of the proposed multirate and mixed solver based cosimulations is to naturally decouple the whole system into the respective TS, EMT, and SFP subsystems. The accuracy of the proposed multirate cosimulation is guaranteed by the proposed interface models, i.e., the TS-SFP interface model (TS-SFP-IM) and the SFP-EMT interface model (SFP-EMT-IM). The efficiency is guaranteed by the natural partitioning strategy, decoupled manner based communication structure and the overall realization of time sequence. The performance of the proposed multirate cosimulation has been validated on practical ac/dc system in China.
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