Abstract
A steady-state time-invariant (SSTI) state-space model is proposed in this paper for the hybrid modular multilevel converter (hybrid MMC). To analyze the internal dynamics of the hybrid MMC, the phasor modelling method is employed with considering three different frequency components in modulation signals. Originating from the state-space model, the steady-state model is obtained for analytically illustrating operating characteristics of the hybrid MMC. A ‘scan and check’ method is proposed to determine the feasible PQ operating zone of the hybrid MMC with considering multiple operating constraints, especially the requirement for successful voltage balancing of half-bridge sub-modules (HBSMs). The accuracy of the state-space model is verified by comparing the time-domain response with the equivalent electromagnetic model of a hybrid MMC in PSCAD/EMTDC. Feasible operating zones of the tested system under different DC terminal voltages are calculated. The effects of different operating constraints on limiting the PQ operating zone are analyzed. The impact of converter parameters such as the sub-module ratio, the arm reactance and the sub-module capacitance on the operating zone is presented in detail.
| Original language | English |
|---|---|
| Pages (from-to) | 99-108 |
| Number of pages | 10 |
| Journal | Electric Power Systems Research |
| Volume | 162 |
| Early online date | 16 May 2018 |
| DOIs | |
| Publication status | Published - 30 Sep 2018 |
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Keywords
- analytical model
- HVDC transmission
- hybrid modular multilevel converter
- small-signal analysis
- steady-state analysis
Cite this
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State-space model and PQ operating zone analysis of hybrid MMC. / Lu, Xiaojun; Xiang, Wang; Lin, Weixing; Wen, Jinyu.
In: Electric Power Systems Research, Vol. 162, 30.09.2018, p. 99-108.Research output: Contribution to journal › Article
TY - JOUR
T1 - State-space model and PQ operating zone analysis of hybrid MMC
AU - Lu, Xiaojun
AU - Xiang, Wang
AU - Lin, Weixing
AU - Wen, Jinyu
PY - 2018/9/30
Y1 - 2018/9/30
N2 - A steady-state time-invariant (SSTI) state-space model is proposed in this paper for the hybrid modular multilevel converter (hybrid MMC). To analyze the internal dynamics of the hybrid MMC, the phasor modelling method is employed with considering three different frequency components in modulation signals. Originating from the state-space model, the steady-state model is obtained for analytically illustrating operating characteristics of the hybrid MMC. A ‘scan and check’ method is proposed to determine the feasible PQ operating zone of the hybrid MMC with considering multiple operating constraints, especially the requirement for successful voltage balancing of half-bridge sub-modules (HBSMs). The accuracy of the state-space model is verified by comparing the time-domain response with the equivalent electromagnetic model of a hybrid MMC in PSCAD/EMTDC. Feasible operating zones of the tested system under different DC terminal voltages are calculated. The effects of different operating constraints on limiting the PQ operating zone are analyzed. The impact of converter parameters such as the sub-module ratio, the arm reactance and the sub-module capacitance on the operating zone is presented in detail.
AB - A steady-state time-invariant (SSTI) state-space model is proposed in this paper for the hybrid modular multilevel converter (hybrid MMC). To analyze the internal dynamics of the hybrid MMC, the phasor modelling method is employed with considering three different frequency components in modulation signals. Originating from the state-space model, the steady-state model is obtained for analytically illustrating operating characteristics of the hybrid MMC. A ‘scan and check’ method is proposed to determine the feasible PQ operating zone of the hybrid MMC with considering multiple operating constraints, especially the requirement for successful voltage balancing of half-bridge sub-modules (HBSMs). The accuracy of the state-space model is verified by comparing the time-domain response with the equivalent electromagnetic model of a hybrid MMC in PSCAD/EMTDC. Feasible operating zones of the tested system under different DC terminal voltages are calculated. The effects of different operating constraints on limiting the PQ operating zone are analyzed. The impact of converter parameters such as the sub-module ratio, the arm reactance and the sub-module capacitance on the operating zone is presented in detail.
KW - analytical model
KW - HVDC transmission
KW - hybrid modular multilevel converter
KW - small-signal analysis
KW - steady-state analysis
UR - http://www.scopus.com/inward/record.url?scp=85047086365&partnerID=8YFLogxK
U2 - 10.1016/j.epsr.2018.05.003
DO - 10.1016/j.epsr.2018.05.003
M3 - Article
VL - 162
SP - 99
EP - 108
JO - Electric Power Systems Research
JF - Electric Power Systems Research
SN - 0378-7796
ER -