Double stage PV-BES weak grid connected system

This paper presents a grid connected solar photovoltaic (PV)-battery system using a double stage topology. The ESOGI (Enhanced Second Order Generalised Integrator)-based control estimates the positive sequence components (PSCs) of grid voltages, the amplitude of grid voltages, and unit templates. The VSC (voltage source converter) converts the DC power to AC power and providing constant power to the grid under a predefined power mode. VSC also performs multiple functions like balancing the grid currents, harmonics elimination, and providing reactive power compensation to the loads. Moreover, BDC (bidirectional converter) control maintains the voltage at the DC link and battery current. At low insolation levels, the battery supplies the required power to the load under a predefined power mode. Moreover, the battery supplies the predefined power to the grid under a predefined power mode condition. Under various dynamic conditions, simulated results and experimental results have shown a good performance.

Automated summary

This paper presents a grid connected solar PV-battery system using a double stage topology. The ESOGI-based control estimates the positive sequence components of grid voltages, the amplitude of grid voltages, and unit templates. The VSC converts DC power to AC power and provides constant power to the grid under a predefined power mode. VSC also performs multiple functions like balancing grid currents, harmonics elimination, and providing reactive power compensation. Moreover, the BDC control maintains the voltage at the DC link and battery current. At low insolation levels, the battery supplies power to the load under a predefined power mode, and also supplies power to the grid under a predefined power mode condition. Simulated and experimental results demonstrate good performance under various dynamic conditions.