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Control Strategy for Power Flow Management in a PV System Supplying DC Loads

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The growing concern for energy saving has increased the usage of LED-based street lights, electronic chokes, compact fluorescent lamps, and inverter-fed drives. Hence, the load profile seen by the electrical grid is undergoing a notable change as these devices have to operate from a dc source. Photovoltaics (PV) being a major energy source, the aforementioned loads can be connected directly to the dc bus. A grid-connected PV system involves a power source (PV array), a power sink (load), and two power sources/sink (utility and battery), and hence, a power flow management system is required to balance the power flow among these sources. One such system is developed for selecting the operating mode of the bidirectional converter by sensing the battery voltage. The viability of the scheme has been ascertained by performing experimental studies on a laboratory prototype. The control strategy is digitally implemented on an Altera Cyclone II Field Programmable Gate Array (FPGA) board, and the algorithm is verified for different modes of operation by varying the load. Experimental results are presented to bring out the usefulness of the control strategy.
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  ELECTRICAL PROJECTS USING MATLAB SIMULINK Gmail: asokatechnologies@gmail.com , Website: http://www.asokatechnologies.in 0-9347143789/9949240245 For Simulation Results of the project Contact Us Gmail: asokatechnologies@gmail.com , Website: http://www.asokatechnologies.in 0-9347143789/9949240245 Control Strategy for Power Flow Management in a PV System Supplying DC Loads Abstract: The growing concern for energy saving has increasedthe usage of   LED-based street lights, electronic chokes, compactfluorescent lamps, and inverter-fed drives. Hence, the load profileseen by the electrical grid is undergoing a notable change asthesedevices have to operate from a dc source. Photovoltaics(PV)being a major energy source, the aforementioned loads can beconnected directly to the dc bus. A grid-connectedPV systeminvolves a power source (PV array), a power sink (load), andtwo power sources/sink (utility and battery), and hence, a power flow management system is required to balance the power flowamong these sources. One such system is developed for selectingthe operating mode of the bidirectional converter by sensingthe battery voltage. The viability of the scheme has been ascertainedby performing experimental studies on a laboratory prototype.The control strategy is digitally implemented on an AlteraCyclone II Field Programmable Gate Array (FPGA) board, andthe algorithm is verified for different modes of operation byvarying the load. Experimental results are presented to bring outthe usefulness of the control strategy. Keywords: 1.Bidirectional converter 2.DCbus3.Photovoltaic4.Power flow management system (PMS) Software: MATLAB/SIMULINK   ELECTRICAL PROJECTS USING MATLAB SIMULINK Gmail: asokatechnologies@gmail.com , Website: http://www.asokatechnologies.in 0-9347143789/9949240245 For Simulation Results of the project Contact Us Gmail: asokatechnologies@gmail.com , Website: http://www.asokatechnologies.in 0-9347143789/9949240245 Block Diagram 1:   Fig.1.Grid-connected PV system with ac and dc loads. Block Diagram 2: Fig.2 Schematic of the bidirectional converter with PMS  ELECTRICAL PROJECTS USING MATLAB SIMULINK Gmail: asokatechnologies@gmail.com , Website: http://www.asokatechnologies.in 0-9347143789/9949240245 For Simulation Results of the project Contact Us Gmail: asokatechnologies@gmail.com , Website: http://www.asokatechnologies.in 0-9347143789/9949240245 Expected Simulation Results: Fig. 3. Steady-state response. (a) Rectifier mode. (b) Inverter mode  ELECTRICAL PROJECTS USING MATLAB SIMULINK Gmail: asokatechnologies@gmail.com , Website: http://www.asokatechnologies.in 0-9347143789/9949240245 For Simulation Results of the project Contact Us Gmail: asokatechnologies@gmail.com , Website: http://www.asokatechnologies.in 0-9347143789/9949240245 Fig. 4. Dynamic respo   nse for step change in load: (a) AC line current control ( iL  —0.5 A/div; V  dc—55 V/div; P  pv— 100 W/div; io  —0.5 A/div). (b) AC line current control ( iL  —1 A/div; V  dc—55 V/div; P  pv—100 W/div; io  —0.5 A/div). (c) Proposed control ( iL  —1 A/div; V  dc—55 V/div; P  pv—100 W/div; ib  —1 A/div; io  —1 A/div; Vb  —5 V/div). Dynamic response for step change in insolation: (d) AC line current control ( iL  —0.5 A/div; V  dc—40 V/div; P  pv—100 W/div; io  —1 A/div). (e) AC line current control ( iL  —0.5 A/div; V  dc—40 V/div; P  pv—100 W/div; io  —1 A/div). (f) Proposed control ( iL  —0.5 A/div; V  dc—55 V/div; P  pv—200 W/div; ib  —1 A/div; io  —1 A/div; Vb  —5 V/div). Time: 0.025 s/div.
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