An Adaptive Hybrid Control of Grid Tied Inverter for the Reduction of Total Harmonic Distortion and Improvement of Robustness against Grid Impedance Variation
Abstract
:1. Introduction
- 1.
- Reduced total harmonic distortion using adaptive resonance compensators while keeping stability margins for the current system unchanged;
- 2.
- The adaptive filters (Notch and Resonant) are implemented to improve the performance of the harmonic compensators and reduce the burden on the current regulator;
- 3.
- The synchronous and stationary reference framed controllers are utilized simultaneously to reduce computational complexity and enhance performance.
2. System Modeling
3. Impedance Based Stability
4. Proposed Model
4.1. Current Regulator
4.2. Adaptive Harmonic Compensators
5. Results and Evaluation
6. Conclusions
Author Contributions
Funding
Institutional Review Board Statement
Informed Consent Statement
Data Availability Statement
Acknowledgments
Conflicts of Interest
References
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Symbol | Description | Values |
---|---|---|
P | Rated power | 5 kW |
DC-link voltage | 400 V | |
Grid voltage (RMS) at PCC | 220 V | |
Grid frequency(fundamental) | 50 Hz | |
Inverter side inductance | 0.75 mH | |
Grid side Inductance | 0.45 mH | |
Filter capacitor | 6.01 uF | |
Active damping constant | 10.6/400 | |
Grid impedance | 0–15 mH | |
SOGI filter damping factor | 0.5 | |
Compensator damping factor | 0.001 | |
Notch filter damping factor | 7 | |
Compensator gain | 250 | |
Proportional gain | 50 | |
Integral time constant | 741 | |
Low pass filter natural frequency | 150 Hz | |
Low pass filter time constant | 3.18 × 10 | |
Proportional gain PLL | 10 | |
Integral time constant PLL | 20 × 10 |
Systems | Z_g | H3 | H5 | H7 | H9 |
---|---|---|---|---|---|
System 1 without Harmonic Compensator | 5 mH | 1.1 | 0.5 | 0.5 | 0.55 |
System 2 with Proposed Harmonic Compensator | 5 mH | 0.2 | 0.1 | 0.1 | 0.15 |
System 1 without Harmonic Compensator | 10 mH | 1.1 | 0.5 | 0.5 | 0.5 |
System 2 with Proposed Harmonic Compensator | 10 mH | 0.45 | 0.19 | 0.1 | 0.1 |
System 1 without Harmonic Compensator | 15 mH | 1.4 | 0.65 | 0.4 | 0.55 |
System 2 with Proposed Harmonic Compensator | 15 mH | 0.4 | 0.2 | 0.1 | 0.15 |
S. No. 1 | Technique | THD When Zg = 5 mH | THD When Zg = 10 mH | THD When Zg = 15 mH |
---|---|---|---|---|
1 | Proposed (Grid Voltage THD = 4.07%) | 0.90% | 0.67% | 0.58% |
2 | Reference [6] (Table III) | 3.50% | 3.20% | 2.90% |
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Muhammad, T.; Khan, A.U.; Chughtai, M.T.; Khan, R.A.; Abid, Y.; Islam, M.; Khan, S. An Adaptive Hybrid Control of Grid Tied Inverter for the Reduction of Total Harmonic Distortion and Improvement of Robustness against Grid Impedance Variation. Energies 2022, 15, 4724. https://doi.org/10.3390/en15134724
Muhammad T, Khan AU, Chughtai MT, Khan RA, Abid Y, Islam M, Khan S. An Adaptive Hybrid Control of Grid Tied Inverter for the Reduction of Total Harmonic Distortion and Improvement of Robustness against Grid Impedance Variation. Energies. 2022; 15(13):4724. https://doi.org/10.3390/en15134724
Chicago/Turabian StyleMuhammad, Tila, Adnan Umar Khan, Muhammad Tajammal Chughtai, Reyyan Ahmad Khan, Yousra Abid, Muhammad Islam, and Sheroz Khan. 2022. "An Adaptive Hybrid Control of Grid Tied Inverter for the Reduction of Total Harmonic Distortion and Improvement of Robustness against Grid Impedance Variation" Energies 15, no. 13: 4724. https://doi.org/10.3390/en15134724