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.
- 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
Available at: http://works.bepress.com/jonathan-kimball/107/