Active Voltage Feedback Control for Hybrid Multiterminal HVDC System Adopting Improved Synchronverters

In this paper, we propose an idea to integrate more renewable energy into the existing China power grid and to provide remote islands with a reliable power supply. The idea is to expand the existing point-to-point line-commutated converter (LCC) HVDC transmission link into a hybrid multiterminal HVDC (hybrid MTDC) system, which contains LCC stations and voltage-source converter (VSC) stations. Accordingly, this paper proposes a novel control strategy for this system called active voltage feedback control, which does not need any high-speed communication system under various disturbances, such as wind speed variations, load fluctuations, faults, etc. This paper also adds secondary frequency regulation to the synchronverter, which is one way of combining the VSC converter with synchronous machine behavior. Then, this paper applies an approach to limit its current under fault conditions. Finally, the entire hybrid MTDC system is modeled in PSCAD/EMTDC. Simulation results show that the improved synchronverter is able to achieve secondary frequency control, and the presented active voltage feedback control works very well when exposed to various disturbances.

[1]  L. H. Fink,et al.  Understanding automatic generation control , 1992 .

[2]  M. R. Iravani,et al.  Application of GTO voltage source inverter in a hybrid HVDC link , 1994 .

[3]  Toshihiko Noguchi,et al.  Direct power control of PWM converter without power source voltage sensors , 1996, IAS '96. Conference Record of the 1996 IEEE Industry Applications Conference Thirty-First IAS Annual Meeting.

[4]  T. Nakajima,et al.  A control system for HVDC transmission by voltage sourced converters , 1999, 1999 IEEE Power Engineering Society Summer Meeting. Conference Proceedings (Cat. No.99CH36364).

[5]  M. Takasaki,et al.  Simulation studies on a control and protection scheme for hybrid multi-terminal HVDC systems , 1999, IEEE Power Engineering Society. 1999 Winter Meeting (Cat. No.99CH36233).

[6]  Boon-Teck Ooi,et al.  Multi-terminal LVDC system for optimal acquisition of power in wind-farm using induction generators , 2001, 2001 IEEE 32nd Annual Power Electronics Specialists Conference (IEEE Cat. No.01CH37230).

[7]  Herbert Werner,et al.  Model of a VSC HVDC terminal attached to a weak AC system , 2003, Proceedings of 2003 IEEE Conference on Control Applications, 2003. CCA 2003..

[8]  Liang Haifeng,et al.  Research on hybrid HVDC , 2004, 2004 International Conference on Power System Technology, 2004. PowerCon 2004..

[9]  Shijie Cheng,et al.  Performance analysis of a hybrid multi-terminal HVDC system , 2005, 2005 International Conference on Electrical Machines and Systems.

[10]  Yong Chang,et al.  Hybrid Multi-terminal HVDC System for Large Scale Wind Power , 2006, 2006 IEEE PES Power Systems Conference and Exposition.

[11]  H.-P. Beck,et al.  Virtual synchronous machine , 2007, 2007 9th International Conference on Electrical Power Quality and Utilisation.

[12]  D. Kirschen,et al.  A Survey of Frequency and Voltage Control Ancillary Services—Part I: Technical Features , 2007, IEEE Transactions on Power Systems.

[13]  J. Driesen,et al.  Virtual synchronous generators , 2008, 2008 IEEE Power and Energy Society General Meeting - Conversion and Delivery of Electrical Energy in the 21st Century.

[14]  Liangzhong Yao,et al.  Multi-terminal DC transmission systems for connecting large offshore wind farms , 2008, 2008 IEEE Power and Energy Society General Meeting - Conversion and Delivery of Electrical Energy in the 21st Century.

[15]  V.G. Agelidis,et al.  VSC-Based HVDC Power Transmission Systems: An Overview , 2009, IEEE Transactions on Power Electronics.

[16]  Marta Molinas,et al.  A controller in d-q synchronous reference frame for hybrid HVDC transmission system , 2010, The 2010 International Power Electronics Conference - ECCE ASIA -.

[17]  Vijay K. Sood,et al.  A hybrid HVDC transmission system supplying a passive load , 2010, 2010 IEEE Electrical Power & Energy Conference.

[18]  Kjetil Uhlen,et al.  Primary frequency control of remote grids connected by multi-terminal HVDC , 2010, IEEE PES General Meeting.

[19]  C D Barker,et al.  Autonomous converter control in a multi-terminal HVDC system , 2010 .

[20]  Hans-Peter Nee,et al.  Power-Synchronization Control of Grid-Connected Voltage-Source Converters , 2010, IEEE Transactions on Power Systems.

[21]  Lin Ma,et al.  Design and control of LCL-filter with active damping for Active Power Filter , 2010, 2010 IEEE International Symposium on Industrial Electronics.

[22]  Qing-Chang Zhong,et al.  Synchronverters: Inverters That Mimic Synchronous Generators , 2011, IEEE Transactions on Industrial Electronics.

[23]  Liangzhong Yao,et al.  DC voltage control and power dispatch of a multi-terminal HVDC system for integrating large offshore wind farms , 2011 .

[24]  Liangzhong Yao,et al.  Integrating Wind Farm to the Grid Using Hybrid Multiterminal HVDC Technology , 2011, IEEE Transactions on Industry Applications.

[25]  Qing-Chang Zhong,et al.  Synchronverter-based control strategies for three-phase PWM rectifiers , 2012, 2012 7th IEEE Conference on Industrial Electronics and Applications (ICIEA).

[26]  Reza Iravani,et al.  Overcurrent and Overload Protection of Directly Voltage-Controlled Distributed Resources in a Microgrid , 2013, IEEE Transactions on Industrial Electronics.

[27]  Wanxing Sheng,et al.  Self-Synchronized Synchronverters: Inverters Without a Dedicated Synchronization Unit , 2014, IEEE Transactions on Power Electronics.

[28]  Yasser Abdel-Rady I. Mohamed,et al.  Integrating VSCs to Weak Grids by Nonlinear Power Damping Controller With Self-Synchronization Capability , 2014, IEEE Transactions on Power Systems.

[29]  Yasser Abdel-Rady I. Mohamed,et al.  Novel Comprehensive Control Framework for Incorporating VSCs to Smart Power Grids Using Bidirectional Synchronous-VSC , 2014, IEEE Transactions on Power Systems.