Comparative Study of Frequency Converters for Doubly Fed Induction Machines
Abstract
:1. Introduction
2. Modeling Methodology
3. Two-Level Frequency Converter and an Asynchronous Generator Motor
4. Three-Level Frequency Converter and an Asynchronous Generator Motor
5. Cascade Frequency Converter and an Asynchronous Generator Motor
6. Multistage-Multilevel Frequency Converter and an Asynchronous Generator-Motor
7. Spectral Analysis of the Output Voltage of the Used Frequency Converters
8. Comparative Analysis of the Used Frequency Converters
9. Discussion and Practical Consequences of the Results
10. Conclusions
- The article presents models of four FC topologies connected to a DFIM, namely: a two-level, three-level, cascade, and multistage-multilevel FC.
- The presented modeling methodology based on interconnected sub-systems leads to rapid responses of the computer system, and thus also to more efficient use of central processing unit (CPU) time.
- In all of the considered variants of FCs that are considering higher harmonics in a broad spectrum, the supply voltage distortion factor of the rotor of the DFIM exceeds 10%. This demonstrates the need to analyze and take into account the effect of higher harmonics on electromagnetic processes in the PSS, DFIM energy losses, and the reliability of the system.
- A comparative analysis of PSS schemes with a doubly fed induction machine, and FCs of various types in the rotor circuit has been made.
- Taking into account the set of indicators, such as the power of semiconductor devices, capacitors energy storage, input/output voltages and currents, the use of IGBT high-speed modules etc., it is recommended to use a PSS scheme with a multistage FC in the DFIM rotor circuit.
- On the basis of complex evaluation of the parameters, the multistage FC has the most favorable values for:
- A network voltage distortion factor (9% compared to the maximum value achieved for another converter scheme);
- rotor current distortion factor (5% compared to the maximum value achieved for another converter scheme);
- power imbalance (14% compared to the maximum value achieved for another converter scheme);
- the total power of the rotor is minimal here (together with Scheme 3, the cascade FC) while maintaining the rotor speed, the active and reactive power of the power system, the active power of the stator, and the total power of the DFIM rotor at the first harmonic.
Acknowledgments
Author Contributions
Conflicts of Interest
References
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Parameters of PSS with DFIM and FC in the Circuit of Rotor | Scheme 1 Two-Level FC | Scheme 2 Three-Level FC | Scheme 3 CASCADE FC | Scheme 4 MMFC |
---|---|---|---|---|
Frequency of pulse-width modulation fPWM [Hz] | 4000 | 4000 | 4000 | 4000 |
Rotor speed of DFIM [pu] | 1.0712 | 1.0742 | 1.0742 | 1.0742 |
Active power of the power system [MW] | 273.93 | 273.93 | 273.91 | 273.93 |
Reactive power of the power system [MVAR] | 96.5 | 96.5 | 96.5 | 96.5 |
Active power of the stator [MW] | 255.32 | 254.91 | 255.62 | 255.85 |
Reactive power of the stator [MVAR] | 97.06 | 97.93 | 96.27 | 96.75 |
Active power in the DFIM rotor circuit [MW] | 18.61 | 19.02 | 18.3 | 18.09 |
Shaft power of DFIM [MW] | 272.33 | 271.77 | 272.67 | 272.87 |
Total power of the rotor of DFIM [MW] | 26.05 | 21.87 | 20.58 | 20.82 |
Total power of DFIM rotor at the first harmonic [MW] | 20.55 | 20.4 | 20.47 | 20.52 |
Power of the transformer primary windings [MW] | 18.82 | 19.06 | 18.31 | 18.09 |
Power of the transformer secondary windings [MW] | 22.91 | 19.82 | 25.52 | 32.19 |
Power of the rectifiers keys [MW] | 173.7 | 173.2 | 454 | 180 |
Power of the inverters keys [MW] | 179.9 | 179.7 | 176.9 | 180 |
Power of the isolating diodes [MW] | - | 167 | - | 135 |
Energy of capacities (0.5∑CU2) [kJ] | 500 | 500 | 1,500 | 500 |
Network voltage distortion factor [%] | 3.98 | 3.57 | 2.76 | 0.34 |
Network current distortion factor [%] | 0.44 | 0.34 | 0.819 | 0.13 |
Rotor voltage distortion factor [%] | 61 | 36 | 10.4 | 17 |
Rotor current distortion factor [%] | 0.18 | 0.29 | 1.0 | 0.053 |
Rectifiers modulation factor amplitude | 0.819 | 0.809 | 0.818 | 0.825 |
Inverters modulation factor amplitude | 0.818 | 0.809 | 0.815 | 0.791 |
Rectified voltage [V] | 10,000 | 10,000 | 820 | 10,000 |
Rotor phase voltage at the first harmonic [V] | 3236 | 3218 | 3224 | 3224 |
Rectifier phase effective current [A] | 1859 | 1900 | 3237 | 2639 |
Inverter phase effective current [A] | 2117 | 2113 | 2116 | 2121 |
Rotor phase effective current [A] | 2117 | 2113 | 2116 | 2121 |
Power imbalance | 0.25 | 0.43 | 0.13 | 0.06 |
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Nahdi, T.; Maga, D. Comparative Study of Frequency Converters for Doubly Fed Induction Machines. Sustainability 2018, 10, 594. https://doi.org/10.3390/su10030594
Nahdi T, Maga D. Comparative Study of Frequency Converters for Doubly Fed Induction Machines. Sustainability. 2018; 10(3):594. https://doi.org/10.3390/su10030594
Chicago/Turabian StyleNahdi, Tarek, and Dusan Maga. 2018. "Comparative Study of Frequency Converters for Doubly Fed Induction Machines" Sustainability 10, no. 3: 594. https://doi.org/10.3390/su10030594