Planning and analysis of the demonstration project of the MVDC distribution network in Zhuhai

Abstract

The DC distribution system is an important development direction of the distribution system, which can improve the reliability and the quality of the power supply, and support the new energy, the energy storage, the electric vehicles, and the flexible access of AC and DC loads to grid. To realize the demonstration application of the DC distribution technology, China’s first demonstration project of the medium voltage DC distribution network will be built in Zhuhai, Guangdong Province to support the construction of the city energy internet. First, this paper analyzes the demand of the DC distribution network project, and puts forward the construction content and construction target. Then, it designs and analyzes the electrical connection mode, system operation mode, and startup and shutdown mode of the DC distribution network, and proposes the overall project construction plan. Finally, it conducts the specific project design and analysis, which mainly include the selection of equipment such as inverters, DC transformers and DC circuit breakers, the design and analysis of the DC control and protection system, the design and analysis of the over-voltage protection and the configuration scheme of the lightning arrester, and analysis of the system transient characteristics. The design and analysis of the engineering program is a combination of China’s distribution network engineering practice and technical characteristics, which lays a solid foundation for the advancement of the DC power distribution technology in China, and has reference value and demonstration effect for the design and construction of other projects.

Key words： MVDC distribution network; DC solid state transformer; DC circuit breaker; modular multilevel converter

Acknowledgments

This work was supported by the National Key Research and Development Program (No. 2017YFB0903203), the “Internet+” Smart Energy (Energy Internet) Demonstration Project, and the 60th China Postdoctoral Science Foundation.

References

1 Baran M E, Mahajan N R. DC distribution for industrial systems: opportunities and challenges. Industry Applications IEEE Transactions on, 2003, 39(6): 1596–1601

2 Riccobono A, Santi E. Comprehensive review of stability criteria for DC power distribution systems. IEEE Transactions on Industry Applications, 2014, 50(5): 3525–3535

3 Nilsson D, Sannino A. Efficiency analysis of low-and medium-voltage DC distribution systems. In: IEEE Power Engineering Society General Meeting, Denver, CO, USA, 2004, 2315–2321

4 Starke M R, Li F, Tolbert L M, Ozpineci B. AC vs. DC distribution: maximum transfer capability. In: 2008 IEEE Power and Energy Society General Meeting–Conversion and Delivery of Electrical Energy in the 21st Century, Pittsburgh, PA, USA, 2008

5 Starke M R, Tolbert L M, Ozpineci B. AC vs. DC distribution: a loss comparison. In: 2008 IEEE/PES Transmission and Distribution Conference and Exposition, Chicago, IL, USA, 2008, 1–7

6 Boroyevich D, Cvetković I, Dong D, Burgos R, Wang F, Lee F. Future electronic power distribution systems a contemplative view. In: 2010 12th International Conference on Optimization of Electrical and Electronic Equipment, Basov, Romania, 2010, 1369–1380

7 Bifaretti S, Zanchetta P, Watson A, Tarisciotti L, Clare J C. Advanced power electronic conversion and control system for universal and flexible power management. IEEE Transactions on Smart Grid, 2011, 2(2): 231–243

8 Wu T F, Sun K H, Kuo C L, Chang C H. Predictive current controlled 5-kW single-phase bidirectional inverter with wide inductance variation for DC-microgrid applications. IEEE Transactions on Power Electronics, 2010, 25(12): 3076–3084

9 Huang A Q, Crow M L, Heydt G T, Zheng J P, Dale S J. The future renewable electric energy delivery and management (FREEDM) system: the energy internet. Proceedings of the IEEE, 2011, 99(1): 133–148

10 Ito Y, Zhongqing Y, Akagi H. DC microgrid based distribution power generation system. In: 4th International Power Electronics and Motion Control Conference, Xi’an, China, 2004, 1740–1745

11 Kakigano H, Miura Y, Ise T, DC micro-grid for super high quality distribution- system configuration and control of distributed generations and energy storage devices. In: 2006 37th IEEE Power Electronics Specialists Conference, Jeju, South Korea, 2006, 1–7

12 Kakigano H, Miura Y, Ise T. Low-voltage bipolar-type DC microgrid for super high quality distribution. IEEE Transactions on Power Electronics, 2010, 25(12): 3066–3075

13 Brenna M, Tironi E, Ubezio G. Proposal of a local DC distribution network with distributed energy resources. In: 11th International Conference on Harmonics and Quality of Power, Lake Placid, NY, USA, 2004, 397–402

14 Magureanu R, Albu M, Priboianu M, Dumitrescu A M. A DC distribution network with alternative sources. In: 2007 Mediterranean Conference on Control & Automation, 2007, 1–4

15 Diaz N L, Dragičević T, Vasquez J C, Guerrero J M. Intelligent distributed generation and storage units for DC microgrids—a new concept on cooperative control without communications beyond droop control. IEEE Transactions on Smart Grid, 2014, 5(5): 2476–2485

16 Shafiee Q, Dragičević T, Vasquez J C, Guerrero J M. Hierarchical control for multiple DC-microgrids clusters. IEEE Transactions on Energy Conversion, 2014, 29(4): 922–933

17 Li C, Chaudhary S K, Dragičević T, Vasquez J C, Guerrero J M. Power flow analysis for DC voltage droop controlled DC microgrids. In: IEEE 11th International Multi-Conference on Systems, Signals & Devices, Barcelona, Spain, 2014, 1–5

18 Stieneker M, Butz J, Rabiee S, Stagge H, Doncker R W D. Medium-voltage DC research grid Aachen. In: International ETG Congress 2015; Die Energiewende–Blueprints for the new energy age, Bonn, Germany, 2015, 1–7

19 Mura F, Doncker R W D. Design aspects of a medium-voltage direct current (MVDC) grid for a university campus. In: 8th International Conference on Power Electronics, Jeju, South Korea, 2011, 2359–2366

20 Jiang D, Zheng H. Research status and developing prospect of DC distribution network. Automation of Electric Power Systems, 2012, 36(8): 98–104 (in Chinese)

21 Wang D, Mao C, Lu J, Chen X, Zeng J, Zhang J. Technical analysis and design concept of DC distribution system. Automation of Electric Power Systems, 2013, 37(8): 82–88 (in Chinese)

22 Qiang S, Zhao B, Liu W, Zeng R. An overview of research on smart DC distribution power network. Proceedings of the CSEE, 2013, 33(25): 9–19 (in Chinese)