Recent advances and control techniques in grid connected PV system – A review

Abstract

In recent years, grid connected photovoltaic system has emerged with its simplicity, reliability and endurability. The ranges of grid tie inverters (GTI) are classified as small scale as several tens of kilowatts and large scale as hundreds of megawatts. Accordingly, the standard of interconnecting to the grid is made higher extent in improving its power system reliability, efficiency and cost. Moreover, the working of grid connected inverter primarily depends on robustness in control strategy, even working in abnormal grid conditions such as deviation of voltage and frequency. This review focuses on updating grid standard codes and regulations, in addition overview of recent control strategies and direct power control. The structure of the phase locked loop (PLL) with grid synchronization techniques for single phase and three phase is discussed in brief. Investigations are performed for a fault ride through capabilities with detailed analysis of islanding detection methods with its types. The PV- STATCOM control functionality for the enhancement is discussed in detail.