Recent developments and future research recommendations of control strategies for wind and solar PV energy systems

Abstract

This paper provides a systematic review of advanced control strategies for the two mostly acclaimed standalone/off-grid distributed generation (DG) systems, i.e., wind energy conversion systems (WECSs) and solar photovoltaic energy systems (PVESs). The existing literature individually studies each DG system and does not provide an appropriate categorization of available advanced control strategies. Thus, it is quite difficult to systematically comprehend the control requirements of overall standalone/off-grid DG systems. Unlike the existing literature, this paper conducts a systematic study based on a useful distinctive organization of the advanced control strategies for the standalone permanent magnet synchronous generator (PMSG)-/doubly-fed induction generator (DFIG)-based WECSs and PVESs. The generalized control configurations for both standalone/off-grid DG systems are specifically exhibited by assigning a control system (CS) with its inherent inputs and outputs for every power conditioning unit (PCU) in the corresponding generation system. The advanced control techniques for all CSs are distinctively classified based on the presented generalized control configurations for both DG systems. Then, a comprehensive review is performed on every control technique with regard to its control functionality in the particular CS. Last, significant future research recommendations are provided for both standalone DG systems keeping in view the improved control strategies and PCUs.

Keywords

• Maximum power point tracking (MPPT) algorithm
• Photovoltaic (PV) arrays
• Pitch angle and speed control techniques
• PMSG-/DFIG-based wind turbines (WTs)
• Standalone/off-grid distributed generation (DG) systems
• Voltage and current control techniques