Control of parallel multiple converters for direct drive permanent magnet wind power generation systems
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This paper discusses control strategies for megawatt-level direct-drive wind generation systems using permanent magnet synchronous generators, addressing issues like reactive power circulation. It proposes a robust adaptive sliding observer for rotor position sensing and presents experimental results demonstrating the effectiveness of its control schemes. Key advancements include the suppression of zero-sequence currents and improved reliability of parallel three-phase PWM converters.
![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
CONCLUSION:
This paper has comprehensively addressed the control issues of parallel three-phase PWM
converters for the permanent magnet wind power generation systems. The major
accomplishments and some conclusions are summarized in the following.
1) A peak current model of zero-sequence currents has been derived and analyzed for the three-
phase PWM converters in parallel connection.
2) A zero-sequence current control scheme has been adapted to reject the zero-sequence current
inside an individual converter.
3) An adaptive observer has been integrated with parallel operation control experimentally. The
performance of position sensorless control of the generator has been greatly enhanced and the
reliability has been increased.
4) Zero-sequence currents have been successfully suppressed for the back-to-back converters
with parallel connection. Large impedance needed to equalize the current sharing has been
removed.
5) Experimental verification of the control of the three-phase PWM converters in parallel
confirms the good performance and promising features of the proposed directly driven
permanent magnet synchronous power generation system.
REFERENCES:
[1] T. Kawabata And S. Higashino, “Parallel Operation Of Voltage Source Inverters,” Ieee
Trans. Ind. Appl., Vol. 24, No. 2, Pp. 281–287, Mar./Apr. 1988.](https://image.slidesharecdn.com/239controlofparallelmultipleconvertersfordirectdrivepermanentmagnetwindpowergenerationsystems-141115035836-conversion-gate01/85/Control-of-parallel-multiple-converters-for-direct-drive-permanent-magnet-wind-power-generation-systems-5-320.jpg)
![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
[2] J. Holtz, W. Lotzkat, And K. H. Werner, “A High-Power Multi-Transistorinverter
Uninterruptable Power Supply System,” Ieee Trans. Power Electron., Vol. 3, No. 3, Pp. 278–
285, Jul. 1988.
[3] L. H.Walker, “10mwgto Converter For Battery Peaking Service,” Ieee Trans. Ind. Appl., Vol.
26, No. 1, Pp. 63–72, Jan./Feb. 1990.
[4] S. Fukuda And K. Matsushita, “A Control Method For Parallel-Connected Multiple Inverter
Systems,” Presented At The 7th Int. Conf. Power Electron. Variable Speed Drives, London,
U.K., 1998.
[5] X. Kun, F. C. Lee, D. Boroyevich, Y. Zhihong, And S. Mazumder, “Interleaved Pwm With
Discontinuous Space-Vector Modulation,” Ieee Trans. Power Electron., Vol. 14, No. 5, Pp. 906–
917, Sep. 1999.](https://image.slidesharecdn.com/239controlofparallelmultipleconvertersfordirectdrivepermanentmagnetwindpowergenerationsystems-141115035836-conversion-gate01/85/Control-of-parallel-multiple-converters-for-direct-drive-permanent-magnet-wind-power-generation-systems-6-320.jpg)
Control of parallel multiple converters for direct drive permanent magnet wind power generation systems
- 1. 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 Of Parallel Multiple Converters For Direct-Drive Permanent-Magnet Wind Power Generation Systems ABSTRACT: This paper proposes control strategies for mega watt level direct-drive wind generation systems based on permanent magnet synchronous generators. In the paper, a circulating current model is derived and analyzed. The parallel-operation controllers are designed to restrain reactive power circulation and beat frequency circulation currents caused by discontinuous space vector modulation. The control schemes do not change the configurations of the system consisting of parallel multiple converters. They are easy to implement for modular designs and large impedance required to equalize the current sharing is not needed. To increase the system reliability, a robust adaptive sliding observer is designed to sense the rotor position of the wind power generator. The experimental results proved the effectiveness of the control strategies. KEYWORDS: 1. Circulation currents 2. Parallel multiple converters 3. Permanent magnet synchronous generators (PMSGs) 4. Wind power SOFTWARE: MATLAB/SIMULINK
- 2. 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: Fig.1. High-Power Direct-Drive PMSG Wind Generator System Connected To The Power Grid. EXPECTED SIMULATION RESULTS: Fig 2. Same phase currents, circulating current, and dc-link voltage Fig. 3. Same phase currents and dc-link voltage of two grid-side of two grid-side branch units without circulating current control. branch units under circulating current control at 10 kW full power
- 3. 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. Generator-side currents and dc-link voltage of an Fig.5. 10 kW full power generating operation. (a) Grid and generator currents. individual converter with circulating current control at (b) Suppressed circulating currents. (c) Carrier phase shifting by 180◦ phase at 10 kW full power. grid side.
- 4. 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.6. Generator-side currents of an individual converter when the Fig. 7. Three-phase generator currents of individual converter operated at generator operated at 1.5 MW. Overlapping of phase-a current at 1.5 MW. Ch1(yellow) is phase-a current of converter I, Ch2 is of converter I in Ch1 (yellow) and phase-a current of converter II phase-b current of converter I, and CH3 (pink) is phase-c current of in Ch3 (pink). Ch2 is phase-b current of converter I. converter I . Fig.8. Grid-side currents of individual converter when the generator Fig.9. Three-phase grid-side currents of an individual converter operated at 1.5 MW. phase-a current of converter I in Ch1 when the generator operated at 1.5 MW. (blue) overlapped with Ch3 (green) phase-a current of converter II. Ch2 is phase-b (red) current of converter I, dc-link voltage in CH4 (pink) 500 V/grid.
- 5. 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 CONCLUSION: This paper has comprehensively addressed the control issues of parallel three-phase PWM converters for the permanent magnet wind power generation systems. The major accomplishments and some conclusions are summarized in the following. 1) A peak current model of zero-sequence currents has been derived and analyzed for the three- phase PWM converters in parallel connection. 2) A zero-sequence current control scheme has been adapted to reject the zero-sequence current inside an individual converter. 3) An adaptive observer has been integrated with parallel operation control experimentally. The performance of position sensorless control of the generator has been greatly enhanced and the reliability has been increased. 4) Zero-sequence currents have been successfully suppressed for the back-to-back converters with parallel connection. Large impedance needed to equalize the current sharing has been removed. 5) Experimental verification of the control of the three-phase PWM converters in parallel confirms the good performance and promising features of the proposed directly driven permanent magnet synchronous power generation system. REFERENCES: [1] T. Kawabata And S. Higashino, “Parallel Operation Of Voltage Source Inverters,” Ieee Trans. Ind. Appl., Vol. 24, No. 2, Pp. 281–287, Mar./Apr. 1988.
- 6. 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 [2] J. Holtz, W. Lotzkat, And K. H. Werner, “A High-Power Multi-Transistorinverter Uninterruptable Power Supply System,” Ieee Trans. Power Electron., Vol. 3, No. 3, Pp. 278– 285, Jul. 1988. [3] L. H.Walker, “10mwgto Converter For Battery Peaking Service,” Ieee Trans. Ind. Appl., Vol. 26, No. 1, Pp. 63–72, Jan./Feb. 1990. [4] S. Fukuda And K. Matsushita, “A Control Method For Parallel-Connected Multiple Inverter Systems,” Presented At The 7th Int. Conf. Power Electron. Variable Speed Drives, London, U.K., 1998. [5] X. Kun, F. C. Lee, D. Boroyevich, Y. Zhihong, And S. Mazumder, “Interleaved Pwm With Discontinuous Space-Vector Modulation,” Ieee Trans. Power Electron., Vol. 14, No. 5, Pp. 906– 917, Sep. 1999.