This chapter deals with the DSP control of three-phase voltage source inverters. A study on a 10-kW grid-connected photovoltaic inverter with two control options, namely, the α-β stationary reference frame and the d-q rotating reference frame, is shown. Experimental results are provided in order to validate the performance and limitations of the control strategies under study.

Chapter Contents:

• 8.1 Introduction
• 8.2 Modeling and control structures of grid-connected three-phase voltage-sourced inverters (VSIs)
• 8.2.1 Modeling in an orthogonal stationary reference frame (StatRF)
• 8.2.1.1 Operation point of the grid-connected VSI in α-β coordinates
• 8.2.1.2 Dynamic model of the grid-connected VSI in α-β coordinates
• 8.2.2 Modeling in an orthogonal synchronous reference frame (SRF)
• 8.2.2.1 Operation point of the grid-connected VSI in d-q coordinates
• 8.2.2.2 Dynamic model of the grid-connected VSI in d-q coordinates
• 8.2.3 Control of a grid-connected PV inverter with LCL filter
• 8.2.3.1 Control structure in a stationary reference frame
• 8.2.3.2 Control structure in a synchronous reference frame
• 8.3 DSP control of a grid-connected PV inverter with LCL filter in the StatRF
• 8.3.1 Design and programming of the current loops in the StatRF
• 8.3.2 Design and programming of the voltage loop in the StatRF
• 8.4 DSP control of a grid-connected PV inverter with LCL filter in the SRF
• 8.4.1 Design and programming of the current loops in the SRF
• 8.4.2 Design and programming of the voltage loop in the SRF
• 8.5 Experimental results
• 8.6 Conclusions
• Acknowledgment
• References

Inspec keywords: photovoltaic power systems; power grids; invertors; power generation control

Other keywords: α-β stationary reference frame; power 10 kW; d-q rotating reference frame; grid-connected photovoltaic inverter; DSP controller; grid-connected three-phase voltage source inverter

Subjects: Solar power stations and photovoltaic power systems; Control of electric power systems; DC-AC power convertors (invertors)