DocumentCode :
109504
Title :
The Limitations of Digital Simulation and the Advantages of PHIL Testing in Studying Distributed Generation Provision of Ancillary Services
Author :
Kotsampopoulos, Panos C. ; Lehfuss, Felix ; Lauss, Georg F. ; Bletterie, Benoit ; Hatziargyriou, Nikos D.
Author_Institution :
Sch. of Electr. & Comput. Eng., Nat. Tech. Univ. of Athens, Athens, Greece
Volume :
62
Issue :
9
fYear :
2015
fDate :
Sept. 2015
Firstpage :
5502
Lastpage :
5515
Abstract :
There is increasing interest in the evaluation of the capability of power-electronic-interfaced distributed generators (DGs) connected to weak medium-voltage (MV) feeders, to provide ancillary services. Classic simulations using simplified DG models have their limitations and may prove insufficient due to the complexity of adequate modeling of power electronic interfaces. Moreover, conventional testing does not allow the investigation of the real generator with the distribution system interactions. Therefore, a scaled-down physical DG (i.e., inverter and dc source) with exactly the same functionalities can be used to evaluate the network integration of the actual DG, by means of power hardware-in-the-loop (PHIL) testing. In this paper, suitable scaling of the power rating and voltage level of the hardware is performed, and an interfacing approach is proposed that achieves stability of simulations without compromising accuracy. The PHIL tests successfully demonstrate potential problems in the coordination of the on-load tap changer controlling the MV feeder with the voltage controller of the DG, such as recurring tap changes, increased reactive power flows, and opposing actions. Moreover, recurring oscillations of the voltage controller of the hardware model are observed at certain system configurations. These inverter control instabilities, which are not visible in purely digital simulations, demonstrate the added value of employing PHIL testing for current and future power system analysis and testing.
Keywords :
distributed power generation; distribution networks; invertors; load flow; on load tap changers; power electronics; power generation control; power system simulation; reactive power; voltage control; DC source; DG models; MV feeders; PHIL testing; distributed generation provision; distributed generators; distribution system interactions; inverter control instabilities; medium-voltage feeders; on-load tap changer; power electronic interfaces; power hardware-in-the-loop; power rating; power system analysis; reactive power flows; recurring oscillations; voltage controller; Hardware; Impedance; Inverters; Power system stability; Software; Stability analysis; Testing; $cosvarphi(P)$; Ancillary services; Distributed Generation; On Load Tap Changer (OLTC); Power Hardware in the Loop (PHIL); Q(U); cos,(P); distributed generation; on-load tap changer (OLTC); power hardware in the loop (PHIL); real-time simulation; simulation methods; stability; voltage control;
fLanguage :
English
Journal_Title :
Industrial Electronics, IEEE Transactions on
Publisher :
ieee
ISSN :
0278-0046
Type :
jour
DOI :
10.1109/TIE.2015.2414899
Filename :
7063951
Link To Document :
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