Grid integration of PV power based on PHIL testing using different interface algorithms

Abstract

Photovoltaic (PV) power among all renewable energies had the most accelerated growth rate in terms of installed capacity in recent years. Transmission System Operators (TSOs) changed their perspective about PV power and started to include it into their planning and operation, imposing PV systems to be more active in grid support. Therefore, a better understanding and detailed analysis of the PV systems interaction with the grid is needed; hence power hardware in the loop (PHIL) testing involving PV power can be a solution to address the testing challenges. To test PV systems for grid code (GC) compliance and supply of ancillary services, first the grid has to be simulated using PHIL, but in order to achieve it, different interface algorithms (IA) had to be evaluated in terms of system stability and signal accuracy

Development of a hybrid emulation platform based on RTDS and reconfigurable power converter-based testbed

“…6, the resistance between the digital and hardware side is used repeatedly in order to improve the stability [12]. The accuracy decreases because of using the resistance repeatedly and there is a resistance needed in the hardware side.…”

Requirements for Power Hardware-in-the-Loop Emulation of Distribution Grid Challenges

“…For detailed investigations on interface algorithms, a multitude of publications can be found-some of them mentioned in the following without going closer into detail: Lauss et al [1] have a closer look at ITM feedback current filtering. In [18], Craciun et al compare the ITM and damping impedance method for an PV integration. This method is modified by Paran et al by using a variable damping impedance [19].…”

“…In [21], a more detailed and complex interfacing approach is proposed together with a method of rescaling power and voltage levels. theoretical work [17], [1], [18], [19], [20], [21] 1 possibly; no detailed information available 2 restricted source and DUT impedance; passive DUT…”

Power hardware-in-the-loop setup for power system stability analyses

“…However, combining several systems, computer simulations and hardware devices, may lead to inaccuracy and hardware damaging [8,9]. Therefore several points have to be considered to run realistic and save experiments: -Real-time capability -Resonance and error damping -Emergency circuit system -Accurate bidirectional coupling Lots of researches for stable and accurate interfaces are under development to ensure safe and realistic behaviors of HIL procedures [10,11].…”