Page 121 - Hybrid-Renewable Energy Systems in Microgrids

An overview of control techniques and technical challenge for inverters in micro grid 105

on cost-prioritized, micro grid protection in meshed topologies, stability improve-
ment, including the voltage fluctuations when a particular DG comes in or out of the
system and DG source dynamics.

5 Conclusion

The requirements of the power industry to benefit from more current, cleaner, and
sustainable power sources, the supply of energy at high quality and reliability through
smart grid appears to be inevitable. Implementing smart microgrids that benefit from
the abilities of DG units in a proper way has been an effective advance in this respect.
PLLs are distinctively as nonlinear and inefficient, it is important to alter the PLL
variables to achieve reasonable execution while controlling the inverter output voltage
in power system keeping in mind the end goal to make the inverter voltage is syn-
chronized with the grid voltage. This chapter has been discussed the PLL strategies
and synchronization systems to find an extensive perspective on their unique, assorted
structures and applications. The highlights of control methods for microgrid invert and
the importance of dynamic security has been discussed. Also, the challenges in the
microgrid for future trends have been discussed.

References

[1] Amin, M.R., Shamsul, S.A., 2017. A framework for selection of grid-inverter synchronisa-
tion unit: harmonics, phase-angle and frequency. Renew. Sust. Energy Rev. 78, 210–219.
[2] Blaabjerg, F., Teodorescu, R., Liserre, M., Timbus, A.V., 2006. Overview of control and
grid synchronization for distributed power generation systems. IEEE Trans. Ind. Electron.
53, 1398–1409.
[3] Rocabert, J., Luna, A., Blaabjerg, F., Rodríguez, P., 2012. Control of power converters in
AC microgrids. IEEE Trans. Power Electron. 27, 4734–4749.
[4] Rodriguez, P., Timbus, A.V., Teodorescu, R., Liserre, M., Blaabjerg, F., 2007. Flexible ac-
tive power control of distributed power generation systems during grid faults. IEEE Trans.
Ind. Electron. 54, 2583–2592.
[5] Mohseni, M., Islam, S.M., 2012. Review of international grid codes for wind power inte-
gration: diversity, technology and a case for global standard. Renew. Sust. Energy. Rev. 16,
3876–3890.
[6] Li, Y.W., Kao, C.-N., 2009. An accurate power control strategy for powerelectronics- in-
terfaced distributed generation units operating in a low-voltage multibus microgrid. IEEE
Trans. Power Electron. 24, 2977–2988.
[7] Ackermann, T., Andersson, G., Söder, L., 2001. Distributed generation: a definition. Electr.
Power Syst. Res. 57, 195–204.
[8] Lee, C.T., Chu, C.C., Cheng, P.T., 2013. A new droop control method for the autonomous
operation of distributed energy resource interface converters. IEEE Trans. Power Electron.
28, 1980–1993.
[9] Li, Y., Vilathgamuwa, D.M., Loh, P.C., 2004. Design, analysis, and real-time testing of a
controller for multibus microgrid system. IEEE Trans. Power Electron. 19, 1195–1204.