Implementation of Solar Photovoltaic System with Universal Active Filtering Capability

 ABSTRACT:

In this work, a novel technique based on second order sequence filter and proportional resonant controller is pro- posed for control of universal active power filter integrated with PV array system (UAPF-PV). Using a second order sequence filter and sampling it at zero crossing of instant of the load voltage, the active component of distorted load current is estimated which is further used to generate reference signal for shunt active filter. The proposed method has good accuracy in extracting fundamental active component of distorted and unbalanced load currents with reduced mathematical computations. Along with power quality improvement, the system also generates clean energy through the PV array system integrated to its DC-bus. The UAPF-PV system integrates benefits of power quality improvement and distributed generation. The system performance is experimentally evaluated on an experimental prototype in the laboratory under a variety of disturbance conditions such as PCC voltage fall/rise, load unbalancing and variation in solar irradiation.

KEYWORDS:

1.      Power quality

2.      Universal active power filter

3.      Adaptive filtering

4.      Photovoltaic system

5.      Maximum power point tracking

6.       Sequence filter

SOFTWARE: MATLAB/SIMULINK

BLOCK DIAGRAM:

Fig. 1. System configuration of UAPF-PV

 EXPECTED SIMULATION RESULTS:

(a) Performance under Load Removal

(b) Performance under Load Addition

Fig. 2. Dynamic Performance under load Unbalance Condition

(a) Performance under PCC Voltage Dip Condition

(b) Performance under Swell Condition

Fig. 3. Dynamic Performance under PCC Voltage dip/rise Condition

Fig. 4. UAPF-PV Response under irradiation Change Condition

Fig. 6. Salient Signals in Extraction of Fundamental Positive Sequence Load Current

(a) Salient Signals in Shunt Active Filter Control

(b) Salient Signals in series active filter Control

Fig. 7. Salient Signals in UAPF-PV Control

 

 CONCLUSION:

 The performance of a novel control technique for solar PV system with universal active filtering has been evaluated. The fundamental positive sequence component of nonlinear load current is extracted using a second order sequence filter along with a zero cross detection technique. The series active filter is controlled using a proportional resonant controller implemented in _ − _ domain along with feedforward component. The system performs satisfactorily under disturbances such as PCC voltage dip/rise, changes in solar radiation and load disturbances. Apart from improving power quality, the system also supplies power from PV array into grid. A comparison of the proposed control shows that the system has improved performance as compared to conventional control techniques with slightly lower computational burden. The system integrates distributed generation along with enhancing power quality of distribution system.

REFERENCES:

 

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