TY - JOUR
T1 - Coherence Analysis of System Characteristics and Control Parameters for Hybrid HVDC Transmission Systems Based on Small-Signal Modeling
AU - Zhu, Jiebei
AU - Li, Suxuan
AU - Yu, Lujie
AU - Bu, Siqi
AU - Li, Yujun
AU - Wang, Yizhen
AU - Deng, Zhaoshun
AU - Liu, Dong
AU - Jia, Hongjie
AU - Wang, Chengshan
N1 - Funding Information:
This work was supported by in part by the SGCC Project (Research on Performance Promotion for Heterogeneous Hardware Platform Based Parallel EMT and Hybrid Simulation Technology) under Grant 5100-201955002A- 0-0-00.
Publisher Copyright:
© 2013 IEEE.
PY - 2021/12/1
Y1 - 2021/12/1
N2 - Hybrid high-voltage direct current (HVdc) system, which comprises a line-commutated converter (LCC) at rectifier side and a voltage source converter (VSC) at inverter side, is drawing wide attention due to its high reliability and economic benefit. For such a new transmission technology, the system characteristics are not comprehensively studied, and inappropriate control parameters may be coherent to system instability. This article puts forward a novel coherence analysis procedure that analyzes system stability based on a verified hybrid HVdc small-signal model. For the first time, the procedure is proposed to capture the coherence relationships between the system characteristics and the control parameters. The analysis results reveal that the circuit and control parameters can highly affect the oscillatory modes and even cause instability. Moreover, the variation of grid short-circuit ratio (SCR) at LCC rectifier side trades off the response speed and damping of the oscillatory modes - under low SCR, large proportional and small integral coefficients of the LCC dc current control are suggested to enhance response performance. Also, the increase of VSC dc capacitance reduces the mode response speed - for a large capacitance, large proportional and small integral coefficients of the VSC dc voltage control shall be set to guarantee system stability.
AB - Hybrid high-voltage direct current (HVdc) system, which comprises a line-commutated converter (LCC) at rectifier side and a voltage source converter (VSC) at inverter side, is drawing wide attention due to its high reliability and economic benefit. For such a new transmission technology, the system characteristics are not comprehensively studied, and inappropriate control parameters may be coherent to system instability. This article puts forward a novel coherence analysis procedure that analyzes system stability based on a verified hybrid HVdc small-signal model. For the first time, the procedure is proposed to capture the coherence relationships between the system characteristics and the control parameters. The analysis results reveal that the circuit and control parameters can highly affect the oscillatory modes and even cause instability. Moreover, the variation of grid short-circuit ratio (SCR) at LCC rectifier side trades off the response speed and damping of the oscillatory modes - under low SCR, large proportional and small integral coefficients of the LCC dc current control are suggested to enhance response performance. Also, the increase of VSC dc capacitance reduces the mode response speed - for a large capacitance, large proportional and small integral coefficients of the VSC dc voltage control shall be set to guarantee system stability.
KW - Converter control
KW - high-voltage direct current (HVdc) transmission
KW - parameter optimization
KW - power system stability
KW - small-signal analysis
UR - http://www.scopus.com/inward/record.url?scp=85120741540&partnerID=8YFLogxK
U2 - 10.1109/JESTPE.2020.3014434
DO - 10.1109/JESTPE.2020.3014434
M3 - Journal article
AN - SCOPUS:85120741540
SN - 2168-6777
VL - 9
SP - 7436
EP - 7446
JO - IEEE Journal of Emerging and Selected Topics in Power Electronics
JF - IEEE Journal of Emerging and Selected Topics in Power Electronics
IS - 6
ER -