A Novel DC-Bus Sensor-less MPPT Technique for Single-Stage PV Grid-Connected Inverters
Abstract
:1. Introduction
2. Derivation of the Proposed Technique
2.1. Typical Single-Stage Configuration Response
2.2. Effect of Change in Insolation
- Step increase in insolation while operating at or below the previous maximum power point;
- Step decrease in insolation while operating below the new maximum power point;
- Step decrease in insolation while operating above the new maximum power point.
2.3. PV Selection Limits
- Continue operation at a power point below the maximum power as long as the inverter and PV voltage criteria are satisfied.
- Set a cut-off power for the inverter such that the inverter will cease operation at very low power values.
3. Proposed System
3.1. Configuration
3.2. Algorithm
3.2.1. Tracking Process
3.2.2. Recharging Process
3.2.3. Observation Process
3.3. Controller
3.4. Parameters
- Choosing a suitable ΔG: this is a design selection based on the required sensing of changes in insolation. Decreasing the value of ΔG leads to an increased accuracy of obtaining true maximum power.
- Find Vdc(Gn−1) and Pout(Gn−1): using PV model in Equation (5), calculate the PV maximum output power at nominal temperature and insolation below maximum by ΔG.
- Find Vdc(Gn): calculate the PV voltage at maximum insolation that would give the same output power at the lower insolation calculated earlier:
4. Simulation Results
4.1. Proposed Sensor-less Configuration
4.2. Configuration with Sensors
4.3. Proposed Sensor-Less Configuration under Partial Shading
4.4. Simulation Evaluation
5. Experimental Results
6. Conclusions
Acknowledgments
Author Contributions
Conflicts of Interest
References
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Parameter | Value |
---|---|
Vg | 220 Vrms |
Number of series PV modules | 20 |
PV array total maximum power | 800 W |
L1 | 80 mH |
Cdc | 10 mF |
mamax | 0.98 |
Settlement range | ±0.002 |
Δma | 0.005 |
algorithm sampling rate | 0.1 s |
Ki Sensorless configuration | 8.0 |
Kp Sensored configuration (Voltage control loop) | 0.5 |
Ki Sensored configuration (Voltage control loop) | 2.2 |
Kp Sensored configuration (Current control loop) | 0.4 |
Ki Sensored configuration (Current control loop) | 8.0 |
Sensorless configuration reference power increment | 70 W |
Sensored configuration reference voltage increment | 1 V |
Tracking Time | Current Oscillations | Sensors | Configuration |
---|---|---|---|
26 s | 0 | 2(Vg, Ig) | Proposed (Figure 9) |
0.3 s | 3.3% | 4(Vdc, Idc, Vg, Ig) | Classical (Figure 1b) |
Parameter | Value |
---|---|
Vg | 220 Vrms |
PV Panel Type | LORENTZ LC175-24M |
Number of parallel PV Panels | 2 |
PMPP/panel | 175 W at 1000 W/m2 |
VMPP | 35 V at 1000 W/m2 |
L1 | 4 mH |
Cdc | 10 mF |
Transformer ratio | 7/230 V |
Switching frequency & Current controller sampling frequency | 10 kHz |
Reference output power incremenet | 15 W |
Algorithm sampling rate | 0.1 s |
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Elsaharty, M.A.; Ashour, H.A.; Rakhshani, E.; Pouresmaeil, E.; Catalão, J.P.S. A Novel DC-Bus Sensor-less MPPT Technique for Single-Stage PV Grid-Connected Inverters. Energies 2016, 9, 248. https://doi.org/10.3390/en9040248
Elsaharty MA, Ashour HA, Rakhshani E, Pouresmaeil E, Catalão JPS. A Novel DC-Bus Sensor-less MPPT Technique for Single-Stage PV Grid-Connected Inverters. Energies. 2016; 9(4):248. https://doi.org/10.3390/en9040248
Chicago/Turabian StyleElsaharty, Mohamed A., Hamdy A. Ashour, Elyas Rakhshani, Edris Pouresmaeil, and João P. S. Catalão. 2016. "A Novel DC-Bus Sensor-less MPPT Technique for Single-Stage PV Grid-Connected Inverters" Energies 9, no. 4: 248. https://doi.org/10.3390/en9040248