Grid Connected Photovoltaic Systems: Challenges and Control Solutions - A Potential Review

Abstract

The thirst for energy has brought out the existence of grid connected solar photovoltaic systems to meet out the reduction in the energy bill, which act as a cost saving methodology with simultaneous gain of incentives from the government for transporting the power to the national grid. Hence the operational objectives and the control strategies employed for its efficient operation are to be well studied. This paper thus discusses in detail about its topology, grid standards, real time challenges and objectives incorporating even the ancillary control schemes. A review is made on the control techniques which are made available for the DC (PV side) and AC side (grid side). A comparative analysis is made on each of the techniques based on the response parameters concluding the suggestion of most appropriate strategy for tolerable operation of grid connected photovoltaic systems.  Index Terms-grid connected photovoltaic system, MPPT control, current control, phase synchronization and direct power control

Direct control of active and reactive power for a grid-connected single-phase photovoltaic inverter

“…), and if > 0.5 , then reactive power compensation might become a requirement as in IEC61727 standards [6]. Therefore, in the proposed PQ calculator the amount of power supplied by the converter can be optionally adjusted (according to grid conditions e.g.…”

Design of type-1 servo controller for grid voltage modulated direct-power control of single-phase grid-connected PV inverter

“…Solar photovoltaic systems are broadly classified into standalone PV systems and grid connected PV systems. Solar PV serves as a sole source of energy satisfying the load demand in standalone systems, whereas in grid connected PV systems, the AC grid also supports the occurring load demand [2]. Many of the single-phase PV systems operated in a standalone configuration, however, connecting them to grid have been on the rise due to the advantages, such as; providing ancillary services to the utility (reactive power support), load balancing, voltage support, and harmonic mitigation [3].…”