Model-based generation of low distortion currents in grid-coupled PWM-inverters using an LCL output filter

In this paper, a single phase inductance–capacitance– inductance (LCL) output stage for grid coupled inverters is designed and built. An accurate model and observer of the output filter and the distorted grid voltage are implemented. The paper deals with the construction of a 14-state model, and the...

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Bibliographic Details
Published in:IEEE transactions on power electronics 2006-07, Vol.21 (4), p.1032-1040
Main Authors: Bolsens, Bruno, Brabandere, Karel De, Den Keybus, Jeroen Van, Driesen, Johan, Belmans, Ronnie
Format: Article
Language:English
Subjects:
active power filter
Applied sciences
Capacitors
Circuits
Computer simulation
Distortion
Electric currents
Electric potential
Electrical engineering. Electrical power engineering
Electrical equipment
Electronics
Exact sciences and technology
Feedback control
Harmonic analysis
Harmonics
Inductance
inductance–capacitance–inductance(LCL) output stage design
inverter current control
Inverters
low grid current distortion
Modulation
Observers
Power electronics, power supplies
powerquality
Pulse width modulation
Resonant frequency
Terms—Active front end
Topology
Voltage
voltage source inverter (VSI)
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Summary:In this paper, a single phase inductance–capacitance– inductance (LCL) output stage for grid coupled inverters is designed and built. An accurate model and observer of the output filter and the distorted grid voltage are implemented. The paper deals with the construction of a 14-state model, and the feedback control loop to obtain adequate closed loop response. Simulations indicate a good performance of the controller, with a total harmonic current distortion (THD) below 1%. Experimental results confirm simulations, and illustrate the correct operation of the Kalman observer to estimate the distorted grid voltage (THD 3%). The observer only uses the inverter current measurement as input. The output filter effectively reduces the pulsewidth modulation harmonics in the grid current.
ISSN:0885-8993
1941-0107
DOI:10.1109/TPEL.2006.876840