Parallel Operation of Inverters With Droop Control of Voltage and Frequency

  • Rakesh S Kushwah


In distributed generation numerous small generating stations are connected to micro grid by using interfacing inverter. While connecting a various inverters in micro grid, load sharing amongst them in very important factor. This paper presents a novel approach for interfacing parallel inverter, the technique used in this paper is based on P-F/Q-V droop control. This technique is very helpful when micro grid is operating in island mode. The droop control is designed in a such a way that it helps in maintaining the voltage and frequency stability. In this paper method of droop control is implemented and characteristics of proportional load sharing are obtained from each connected inverter. The two inverters operation is shown in this paper. The two inverter scheme with droop control is implemented in MATLAB and results obtained shows significant sharing of load while maintaining the constant voltage and frequency.

Keywords: Parallel operation of converter, droop control of Voltage and frequency, power grid, proportional power sharing etc.


1] Chethan Raj D, D N Gaonkar, “Frequency and Voltage Droop Control of Parallel Inverters in Microgrid” 2016 2nd International
Conference on Control, Instrumentation, Energy & Communication (CIEC)
[2] H.Farhangi, "The path of the smart grid", IEEE Power Energy Mag., vol 8, no.1, pp.18-28, Jan/Feb.2010.
[3] M.Chandorkar, D.Divan, and R.Adapa, "Control of parallel connected inverters in standalone AC supply systems", IEEE Tranactions on Industry Applications, vol. 29, no.1, pp.136-143, Jan/Feb 1993.
[4] R.Lasseter, "Microgrids", in Power Engineering Society Winter Meeting. 2002. IEEE, vol.1, 2002, pp.305-308.
[5] Y.B.Byn, T.G.Koo, K.Y.Joe, E.S.Kim, J.I.Seo, and D.H.Kim, "Parallel operation of three phase UPS inverters by wirless load sharing control", in Proc.22nd, Int. Telecommun. Energy conf., 2000, pp.526-532.
[6] T.F.Wu, Y.K.Chen ,and Y.H.Huang, "3C strategy for inverters in parallel operation achieving and equal current distribution", IEEE Trans.Ind.Electron.,vol.47,no.2,pp.273281,Apr.2000.
[7] Y.Pei, G.Jiang, X.Yang and Z.Wang, "Auto master slave control technique of parallel inverters in distributed ac power systems and UPS", in Pro. IEEE Power Electron. Spec. Conf., 2004, pp.2050-2053.
[8] J.M.Guerrero, L.G.DeVicuna, J.Matas, M.Castilla, and J.Miret, "A wirless controller to enhance dynamic performance of parallel inverters in distributed generations systems", IEEE Trans. on Power Electronics, vol.19, pp.1205-1213, 2004.
47 Views | 27 Downloads
How to Cite
S Kushwah, R. (2018). Parallel Operation of Inverters With Droop Control of Voltage and Frequency. Asian Journal For Convergence In Technology (Founded by ISB &M School of Technology )), 4(I). journals.v4iI.468
Electrical & Electronics Engineering