A Voltage Sensorless Control of a Three Phase Grid Connected Inverter based on Lyapunov Energy Function under Unbalanced Grid Voltage Condition
Voltage sensing in a three-phase grid-connected inverter can be expensive, and introduces vulnerability to the sensor's failure. To address this problem, a sensorless current control strategy is introduced which is composed of two basic elements. First, a current controller based on a Lyapunov energy function is derived by the assumption of known grid voltage. Next, a dual second-order generalized integrator (DSOGI) structure is utilized to extract the positive sequence grid voltage from the Lyapunov-based current controller outputs and generate the unit vectors from the phase locked loop. The methodology presented has been verified in simulation using MATLAB/Simulink and PLECS. Experimental validation is provided by a reduced scale laboratory prototype.
V. R. Chowdhury et al., "A Voltage Sensorless Control of a Three Phase Grid Connected Inverter based on Lyapunov Energy Function under Unbalanced Grid Voltage Condition," Proceedings of the 2018 IEEE Energy Conversion Congress and Exposition (2018, Portland, OR), pp. 4884 - 4888, Institute of Electrical and Electronics Engineers (IEEE), Sep 2018.
The definitive version is available at https://doi.org/10.1109/ECCE.2018.8558434
2018 IEEE Energy Conversion Congress and Exposition, ECCE 2018 (2018: Sep. 23-27, Portland, OR)
Electrical and Computer Engineering
Intelligent Systems Center
Keywords and Phrases
Controllers; Electric current control; Electric inverters; Energy conversion; Locks (fasteners); Lyapunov functions; MATLAB; Phase locked loops; Current controller; Experimental validations; Lyapunov energy functions; Phase Locked Loop (PLL); Second-order generalized integrators; Sensorless; Three-phase grid connected inverters; Voltage sensorless controls; Sensorless control; Dual second order generalized integrator (DSOGI); Lyapunov function based current controller; Voltage sensorless
International Standard Book Number (ISBN)
Article - Conference proceedings
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01 Sep 2018