Ke Ji, Weiming Chen, Xueguang Wu, et al. High Frequency Stability Constraints Based MMC Controller Design Using NSGA-III Algorithm[J]. CSEE Journal of Power and Energy Systems, 2023, 9(2): 623-633.
DOI:
Ke Ji, Weiming Chen, Xueguang Wu, et al. High Frequency Stability Constraints Based MMC Controller Design Using NSGA-III Algorithm[J]. CSEE Journal of Power and Energy Systems, 2023, 9(2): 623-633.DOI: 10.17775/CSEEJPES.2020.03810.
High Frequency Stability Constraints Based MMC Controller Design Using NSGA-III Algorithm
The occurrence of high frequency resonances (HFRs) has been frequently observed in several MMC-HVDC projects. To avoid these HFRs
the controller design of an MMC must satisfy two requirements: 1) The controller should remain stable while in the high frequency range
and 2) MMC impedance should not possess a negative real part in the high frequency range. So far
majority of the related studies on MMC controller design have been unable to address these requirements precisely. This paper first describes the simplified high frequency MMC impedance model developed indigenously by the authors. Subsequently
the driving mechanism of two kinds of HFRs is revealed using the said developed model
including: 1) MMC controller instability
and 2) Interaction instability between MMC and AC cables. Furthermore
the mathematical expressions outlining the controller stability constraint and positive damping constraint are proposed. Additionally
NSGA-III based multi-objective optimization algorithm is adopted
to identify the region most suitable for satisfying the proposed stability constraints under the MMC controller parameters. The proposed controller design method is capable of effectively evading the HFRs triggered by the incompatible MMC. The detailed time-domain simulations generated using PSCAD/EMTDC software validate the proposed designed method and endorse the improved results.