A Coordinated Marginal Current Control Method for LCC-HVDC

Line-commutated-converter-based HVdc (LCC-HVdc) is extensively used in modern power systems. Most of the LCC-HVdcs are implemented with the control strategy termed marginal current control method (MCCM), while their operation is sensitive to disturbance from the ac part of the system. This paper originally reveals the mechanism of two types of oscillations induced by the MCCM after ac disturbances, i.e., the current boundary induced oscillation and the current error induced oscillation. A coordinated marginal current control method (CMCCM) is proposed, aiming at suppressing the aforementioned oscillations and enhancing HVdc recovery performance. Compared to the MCCM that responds only to dc voltage, the CMCCM additionally considers ac voltage, ac current, and power factor of the converter. AC grid's parameters are also taken into account. With a more considerate design, the empirical current boundary determined by the MCCM is replaced with an analytical one to coordinately control dc current. Therefore, better performance of HVdc is achieved. Simulations in RTDS reveal that the proposed CMCCM can suppress the oscillations, speed up HVdc recovery process, and moderate transient over voltage of HVdc.

[1]  Jian Sun,et al.  HVDC transmission system architectures and control - A review , 2013, 2013 IEEE 14th Workshop on Control and Modeling for Power Electronics (COMPEL).

[2]  Ali Abur,et al.  Tracking Three-Phase Untransposed Transmission Line Parameters Using Synchronized Measurements , 2018, IEEE Transactions on Power Systems.

[3]  G. Andersson,et al.  Analysis of HVDC converters connected to weak AC systems , 1990 .

[4]  M. Szechtman,et al.  A benchmark model for HVDC system studies , 1991 .

[5]  Amirthagunaraj Yogarathinam,et al.  Impact of Inertia and Effective Short Circuit Ratio on Control of Frequency in Weak Grids Interfacing LCC-HVDC and DFIG-Based Wind Farms , 2017, IEEE Transactions on Power Delivery.

[6]  Farrokh Aminifar,et al.  Parameter Estimation of Multiterminal Transmission Lines Using Joint PMU and SCADA Data , 2015, IEEE Transactions on Power Delivery.

[7]  M. Szechtman,et al.  Transient AC voltage related phenomena for HVDC schemes connected to weak AC systems , 1992 .

[8]  Oluwafemi E. Oni,et al.  A review of LCC-HVDC and VSC-HVDC technologies and applications , 2016, 2016 IEEE 16th International Conference on Environment and Electrical Engineering (EEEIC).

[9]  Gilsoo Jang,et al.  HVDC Transmission: Power Conversion Applications in Power Systems , 2009 .

[10]  A. E. Hammad,et al.  Improving the dynamic performance of a complex AC/DC system by HVDC control modifications , 1990 .

[11]  Amirthagunaraj Yogarathinam,et al.  Frequency control for weak AC grid connected to wind farm and LCC-HVDC system: Modeling and stability analysis , 2016, 2016 IEEE Power and Energy Society General Meeting (PESGM).

[12]  D. Povh,et al.  Further development of HVDC control , 2011, 2011 IEEE Trondheim PowerTech.

[13]  Deqiang Gan,et al.  Assessing Strength of Multi-Infeed LCC-HVDC Systems Using Generalized Short-Circuit Ratio , 2019, IEEE Transactions on Power Systems.

[14]  Gert Rietveld,et al.  Utilization of PMU Measurements for Three-Phase Line Parameter Estimation in Power Systems , 2018, IEEE Transactions on Instrumentation and Measurement.

[15]  Seung-ill Moon,et al.  Reactive power control operation scheme of LCC-HVDC for maximizing shunt capacitor size in AC systems , 2015, 2015 IEEE PES Asia-Pacific Power and Energy Engineering Conference (APPEEC).

[16]  D. Povh,et al.  Analysis of Innovative HVDC Control , 2009, 2009 IEEE Bucharest PowerTech.

[17]  J. Reeve,et al.  Gain scheduling adaptive control strategies for HVDC systems to accommodate large disturbances , 1994 .

[18]  Chunpeng Zhang,et al.  Improved current order control strategy for effective mitigation of commutation failure in HVDC system , 2017, 2017 IEEE Power & Energy Society General Meeting.

[19]  Zhou Huafeng,et al.  On-line PMU-based transmission line parameter identification , 2015 .

[20]  J. Reeve,et al.  Multi-infeed HVDC transient response and recovery strategies , 1993 .

[21]  F. Karlecik-Maier.  A New Closed Loop Control Method for HVDC Transmission , 1996 .

[22]  Zheng Xu,et al.  The strength indexes of the islanded LCC‐HVDC sending power system , 2019 .

[23]  G. Andersson,et al.  Power stability analysis of multi-infeed HVDC systems , 1998 .

[24]  Aniruddha M. Gole,et al.  Dynamic performance of static and synchronous compensators at an HVDC inverter bus in a very weak AC system , 1994 .

[25]  Chunyi Guo,et al.  An Improved Measure of AC System Strength for Performance Analysis of Multi-Infeed HVdc Systems Including VSC and LCC Converters , 2018, IEEE Transactions on Power Delivery.

[26]  Guoqiang Sun,et al.  LCC-HVDC Supplementary Controller Design Based on Global Fast Terminal Sliding Mode Control , 2018, 2018 IEEE International Conference on Energy Internet (ICEI).

[27]  Weidong Yang,et al.  A co-ordinated recovery strategy of multi-infeed HVDC systems , 2001, 2001 IEEE Power Engineering Society Winter Meeting. Conference Proceedings (Cat. No.01CH37194).

[28]  Xinzhou Dong,et al.  A Predictive Control Strategy for Mitigation of Commutation Failure in LCC-Based HVDC Systems , 2019, IEEE Transactions on Power Electronics.

[29]  Dirk Van Hertem,et al.  HVDC Systems in Smart Grids , 2017, Proceedings of the IEEE.