Decoupled Power Flow Of A Single Stage Grid Connected PV System With Multilevel Inverter

Umesh Kumar Sinha

With the wide installation of solar PV array in respect of other renewable power generation, there is a scope of feeding the surplus power to grid for better and economic power utilization. This paper presents an independent control of active and reactive power flow of single stage grid connected PV system with multilevel inverter. Vector control scheme has been implemented in d-q reference frame which is synchronously rotating with the grid frequency. Two current control loop has been used, one for d-axis and other for q-axis to control the current injected into the grid such that it has low total harmonic distortion and in phase with the grid voltage. In addition to that, a DC voltage control loop has also been implemented to operate the inverter at the desired DC link voltage that is the DC voltage corresponding to maximum power, which is obtained by the MPPT algorithm. Grid-connected inverters have wide application in the field of distributed generation and power quality. The above scheme employs a three-phase three-level Diode clamped multilevel inverter to improve the current injected to grid.

https://dx.doi.org/10.31873/IJEAS.6.11.16