This paper presents a step by step modeling of a new improved hybrid photovoltaic fed distributed static compensator (PV-DSTATCOM) in ab-c reference frame. Further the system average model is transformed to orthogonal synchronous (d-q) reference frame. The new improved PV-DSTATCOM is used to compensate the current distortion and reactive power, generated by a non-linear three phase bridge uncontrolled rectifier with ohmic-inductive load. For perfect harmonic compensation (PHC) and unit power factor (UPF) a multi-loop control scheme is employed in which the inner controller ensures the current harmonic and reactive power compensation, and the outer controller takes care of the voltage regulation at the dc side of PV-DSTATCOM. The presented system is implemented using MATLAB/Simulink tool and the performance is discussed through obtained simulation results. Furthermore an experimental setup is developed and the efficacy of the system is verified under practical limitations. Both the simulation and experimental results confirm the effectiveness of the presented system under ideal and distorted supply voltage.
1. Photovoltaic fed distributed static compensator
2. Harmonic elimination
3. Synchronous reference frame
4. Average modeling.
Fig. 1 Line diagram of new hybrid PV-DSTATCOM
EXPECTED SIMULATION RESULTS:
Fig. 2. Simulation results for ideal supply voltage (a) source voltage (b) load current before compensation (c) source current after compensation
Fig. 3. Simulation results for distorted supply voltage (a) source voltage (b) load current before compensation (c) source current after compensation
Fig. 4. Simulation results for unbalanced supply voltage (a) source voltage (b) load current before compensation (c) source current after compensation
Fig. 5. Simulation results for unbalanced and distorted supply voltage (a) source voltage (b) load current before compensation (c) source current after compensation
In this paper a step by step modeling of the new improved PV-DSTATCOM in abc frame and its transformation to dq frame has been derived. With the implemented controller and dc voltage regulator, the PV-DSTATCOM shows adequate tracking performance and the ability to achieve unity power factor in both simulation end real time constraints.
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