Phase-Frequency Controlled In Virtual Synchronous Converter for Low-Voltage Microgrid-Inverter Synchronization

Md Ruhul Amin, Shamsul Aizam Zulkifli


In this paper, it will explain an internal voltage controlled based on generator swing technique/dynamic response in virtual synchronous converter (VSCon) in order to achieve voltage synchronization between low voltage microgrid and inverter.  As known, PLL is a common technique in order to synchronize the amplitude, phase-angle and frequency between microgrid and inverter for voltage connection. VSCon is a technique does not require any phase locked loop (PLL) circuit as an external control structure for the inverter synchronization function. This VSCon has been modeled and simulated in Matlab/Simulink software, with single-phase source input system connected with several loads variation. This VSCon has been implemented in inverter control to generate a pulse width modulation (PWM) signal that respond with the grid information in order to synchronize the inverter output voltage with the grid voltage without using the PLL. Several simulation tests have been conducted to prove the reliability of this VSCon. It also has been tested when the grid frequency changes from the rated frequency to 51Hz where the result shows that, VSCon takes nearly 20ms to synchronize to this changes frequency value.

Total Views: 150


Grid; Inverter; Phase-Locked-Loop; Synchronous Generator; Synchronization

Full Text:



M. R. Amin, R. B. Roy, and M. M. Hasan, “Modeling and Optimization of Decentralized Microgrid System for St. Martin’s Island in Bangladesh,” Int. J. Energy, Inf. Commun., vol. 5, no. 5, pp. 1–12, Oct. 2014.

M. Marinelli, F. Sossan, G. T. Costanzo, and H. W. Bindner, “Testing of a Predictive Control Strategy for Balancing Renewable Sources in a Microgrid,” IEEE Trans. Sustain. Energy, vol. 5, no. 4, pp. 1426–1433, Oct. 2014.

D. G. Patino, E. G. Erira, J. R. Fuelagan, and E. E. Rosero, “Implementation a HERIC inverter prototype connected to the grid controlled by SOGI-FLL,” 2015 IEEE Work. Power Electron. Power Qual. Appl. PEPQA 2015 - Proc., no. Dc, 2015.

M. R. Amin and Rajib Baran Roy, “Design of microcontroller based Thyristor Controlled three-phase static volt-ampere reactive compensator,” in 2014 International Conference on Informatics, Electronics & Vision (ICIEV), 2014, pp. 1–6.

J. Rocabert, A. Luna, F. Blaabjerg, and P. Rodríguez, “Control of Power Converters in AC Microgrids,” IEEE Trans. Power Electron., vol. 27, no. 11, pp. 4734–4749, Nov. 2012.

M. R. Amin and S. A. Zulkifli, “PLL and Self-synchronized Synchronverter: an Overview of Grid-inverter Synchronization Techniques,” in 10th International Power Engineering and Optimization Conference (PEOCO’16), 2016, p. 8.1.

Q.-C. Zhong and G. C. Konstantopoulos, “Current-Limiting Droop Control of Grid-connected Inverters,” IEEE Trans. Ind. Electron., pp. 1–1, 2016.

Y. Li, J. Li, Y. Lei, and W. Sun, “Grid synchronization technology for distributed power generation system,” IEEE Transp. Electrif. Conf. Expo, ITEC Asia-Pacific 2014 - Conf. Proc., pp. 1–6, 2014.

M. R. Amin and S. A. Zulkifli, “Non-PLL Fast Grid-Inverter Synchronization for Microgrids Applications,” in 2016 IEEE 6th International Conference on Power and Energy (PECON 2016), Hatten Hotel Melaka, Malaysia, 28-29 November 2016, 2016.

S. M. Silva, B. M. Lopes, B. J. C. Filho, R. P. Campana, and W. C. Bosventura, “Performance evaluation of PLL algorithms for single-phase grid-connected systems,” Conf. Rec. 2004 IEEE Ind. Appl. Conf. 2004. 39th IAS Annu. Meet., vol. 4, no. 1, pp. 2259–2263, 2004.

R. M. Linus and P. Damodharan, “Performance Analysis of Field Oriented Controlled Grid Side Inverter For Grid Synchronization of Wind Energy Conversion System Under Different Loaded Conditions,” pp. 6–11, 2014.

G. Valverde and T. Van Cutsem, “Model predictive control of voltages in active distribution networks,” IEEE Trans. Smart Grid, vol. 4, no. 4, pp. 2152–2161, 2013.

O. C. Castillo, R. O. Gonzalez, and J. J. Rodriguez Rivas, “Comparison of synchronization techniques to the grid applied to single-phase inverters,” 2013 4th IEEE Int. Symp. Power Electron. Distrib. Gener. Syst. PEDG 2013 - Conf. Proc., 2013.

Q. C. Zhong and G. Weiss, “Synchronverters: Inverters that mimic synchronous generators,” IEEE Trans. Ind. Electron., vol. 58, no. 4, pp. 1259–1267, 2011.

Q. C. Zhong, P.-L. P. Nguyen, Z. Ma, and W. Sheng, “Self-synchronised Synchronverters: Inverters without a Dedicated Synchronisation Unit,” IEEE Trans. Power Electron., vol. 29, no. c, pp. 1–1, 2014.

Q.-C. Zhong and D. Boroyevich, “Structural Resemblance Between Droop Controllers and Phase-Locked Loops,” IEEE Access, vol. 4, pp. 5733–5741, 2016.

Q.-C. Zhong and G. Weiss, “Static synchronous generators for distributed generation and renewable energy,” in 2009 IEEE/PES Power Systems Conference and Exposition, 2009, pp. 1–6.

F. Paul M, Anderson A. A., Power System Control and Stability, 2nd ed. USA: Willey-IEEE Press.

S. J. Chapman, Electric Machinery Fundamentals, 4th ed. McGraq Hill, 2005.

D. P. Kothari and I. J. Nagrath, Electric Machines. New Delhi: Tata McGraw Hill Publishing Company Limited, 2004.

J. J. Grainger and W. D. Stevenson, Power System Analysis, Six. McGraw Hill, 2005.

M. Takahashi, K. Matsuzawa, M. Sato, K. Omata, R. Tsukui, T. Nakamura, and S. Mizuguchi, “Fast generation shedding equipment based on the observation of swings of generators,” IEEE Trans. Power Syst., vol. 3, no. 2, pp. 439–446, May 1988.

R. Teodorescu, F. Blaabjerg, U. Borup, and M. Liserre, “A new control structure for grid-connected LCL PV inverters with zero steady-state error and selective harmonic compensation,” in Nineteenth Annual IEEE Applied Power Electronics Conference and Exposition, 2004. APEC ’04., vol. 1, pp. 580–586.


Online ISSN: 1309-0127;;

IJRER is cited in SCOPUS, EBSCO, WEB of SCIENCE (Thomson Reuters)