Paper Info
Title
Existence Of Sinusoidal Orbits Of A Nonlinear Proportional And Resonant Current Regulator For Islanded Microgrids
Abstract
Conventional control strategies for ac power electronic inverters are based on the availability of very stable voltage and frequency references from synchronous generators with large inertia (i. e., the generators can be approximately treated as ideal infinite buses). Such strategies are no longer adequate for low or zero-inertia electricity generating systems like microgrids, which rely upon a high penetration of renewable energy sources. This has led to new inverter control strategies for microgrids, with the goal of fulfilling load power demand while guaranteeing stability of a microgrid.In this paper we initiate the analysis of a nonlinear current control scheme for regulating microgrids that consists of a linear proportional and resonant controller in a feedback connection with a nonlinear phase-locked loop. Numerical simulations and laboratory experiments in the literature support heuristic arguments suggesting that this scheme can generate a sinusoidal voltage at a frequency which adapts itself to the impedance angle of the load, thus providing an intrinsic frequency droop for primary control in a microgrid. Moreover, multiple inverters can synchronise to a common frequency and the scheme can be augmented with additional control loops to provide voltage regulation, current magnitude droop and secondary control. In this paper we rigorously establish the existence of sinusoidal orbits for this current control scheme, for the special case of a single-phase inverter connected to an RL load. This confirms that the system can indeed generate a purely sinusoidal output voltage (i. e., contains no harmonics) as observed in simulations.
Year
DOI
Venue
2018
10.1109/CDC.2018.8619680
2018 IEEE CONFERENCE ON DECISION AND CONTROL (CDC)
Field
DocType
ISSN
Inverter,Control theory,Computer science,Control theory,AC power,Electrical impedance,Voltage regulation,Harmonics,Microgrid,Voltage droop
Conference
0743-1546
Citations 
PageRank 
References 
0
0.34
0
Authors
2
Name
Order
Citations
PageRank
Hendra Ishwara Nurdin125237.19
Fletcher, J.E.21612.82