Abstract
This chapter is dedicated to DC Microgrid’s application to provide ancillary services to weak AC grids. In particular, control algorithms are designed to provide inertial, frequency and voltage support for weak grids, such as AC Microgrids composed mainly by sources interfaced by power converters, with a small portion of diesel generators. A number of synthetic inertia approaches are introduced to improve the stability properties of an AC grid face to strong variations on loads and productions, brought by electric vehicles and possibly other renewable energy sources. The power electronic issues related to control interactions and poor inertial response are described, where suitable solution is addressed. The power converter is driven as a Virtual Synchronous Machine (VSM), where the control strategy follows classical swing equation, such that the converter emulates a synchronous generator, including inertial support. This strategy can be exploited in low inertia systems with high penetration of renewables. An application example illustrates the performance of the Microgrid in the context of virtual inertia control.
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Notes
- 1.
Synchronous generators store kinetic energy proportional to moment of inertia J and the square of their angular speed, with time response of few seconds.
- 2.
The capacitors of power converters can store electrostatic energy in order of units to hundreds of milliseconds.
- 3.
Usually, VSC have outer voltage control loop and an inner control loop, which is the current control loop.
- 4.
Frequency Nadir is defined as the minimum value of frequency reached during the transient period.
- 5.
Nominal frequency in this case is 60 Hz.
- 6.
Note that VSM is said as the VSC operating as a synchronous machine.
- 7.
The comparison can also be done with moment of inertia J.
- 8.
Power converter units can be understand as a generalization for DER integrated via power converters.
- 9.
PLL performance problems can also be cited here, since may bring steady-state errors and instability mainly in weak grids application. So, this approach requires robust PLL implementation [70].
- 10.
The swing equation of VSM allows interactions with the grid frequency, influencing its behavior.
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Perez, F., Damm, G., Ribeiro, P. (2022). DC Microgrids for Ancillary Services Provision. In: Zambroni de Souza, A.C., Venkatesh, B. (eds) Planning and Operation of Active Distribution Networks. Lecture Notes in Electrical Engineering, vol 826. Springer, Cham. https://doi.org/10.1007/978-3-030-90812-6_15
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