P-Q and P-V Control of Photovoltaic Generators in Distribution Systems
In this paper, simultaneous management of active power and volt/var is explored with photovoltaic (PV) generators in distribution systems. The PV active power output can be controlled in the load-following mode when sufficient solar power is out there to provide a local load, or the most power point tracking (MPPT) mode when a local load is giant or injection to the system is allowed. Two selected control approaches, P-Q management within the load-following mode and P-V control in the MPPT mode, are investigated in this paper. The P-Q management is implemented with a relatively easy approach, whereas the P-V management demands an extra MPPT logic, that is solved primarily based on an influence balance between the dc and ac sides in an exceedingly 2-stage PV configuration. The management algorithms are tested with the IEEE 13-bus distribution feeder with numerous system conditions just like the presence of multiple PV generators, imbalance, harmonics, and faults. The MATLAB and SimPowerSystems simulation results clearly demonstrate the capability of the proposed control in maintaining the P/V bus as either a P-Q or P-V bus relying on totally different applications.
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