Application of Transformerless High Gain DC/DC Converter for Grid-connected Offshore Windfarms

Mohamad Reza  Banaei; Farhad Mohajel  Kazemi

doi:10.6180/jase.2016.19.3.11

Application of Transformerless High Gain DC/DC Converter for Grid-connected Offshore Windfarms

Mohamad Reza Banaei This email address is being protected from spambots. You need JavaScript enabled to view it.¹ and Farhad Mohajel Kazemi¹

¹Electrical Engineering Department, Azarbaijan Shahid Madani University, Tabriz, Iran

Received: July 2, 2015
Accepted: February 17, 2016
Publication Date: September 1, 2016

Download Citation: ||https://doi.org/10.6180/jase.2016.19.3.11

ABSTRACT

In this paper, operation and control of an offshore wind farmusing typical configuration is considered. Commonly, the offshore wind farms are connected to the grid using HVDC transmission system in order to decrease power losses and voltage sag. In the proposed configuration a new cascaded structure of transformerless high gain DC/DC converter is appliedinstead of a power transformer. The proposed DC/DC converter can boost voltage level and regulate DC link voltage in output of permanent magnet synchronous generator (PMSG). By adjusting DC link voltage in a suitable value, the maximum active power can be received from PMSG. The main advantage of the proposed configuration is that there aren’t anypower transformer and back-to-back converter inoutput of PMSG. The simulation results confirm good operation of the proposedconfiguration in various wind speeds. Also experimental results of the introduced prototype of the DC/DC converter show the effectiveness of this converter in high gain mode.

Keywords: Offshore Wind Farm, High Gain DC/DC Converter, PMSG, HVDC

REFERENCES

[1] Muyeen, S. M., Takahashi, R. and Tamura, J., “Operation and Control of HVDC-Connected Offshore Wind Farm,” IEEE Trans. Sustainable Energy, Vol. 1, No. 1, pp. 3037 (2010). doi: 10.1109/TSTE.2010.2041561
[2] Edrah, M., Lo, K. L. and Anaya-Lara, Elansari, A, “Impact of DFIG Based Offshore Wind Farms Connected Through VSC-HVDC Link on Power System Stability,” 11th IET International Conference on AC and DC Power Transmission, pp. 17 (2015). doi: 10. 1049/cp.2015.0054
[3] Wang, L., Wang, K.-H., Lee, W.-J. and Chen, Z., “Power-Flow Control and Stability Enhancement of Four Parallel-Operated Offshore Wind Farms Using a Line-Commutated HVDC Link,” IEEE Transactions on Power Delivery, Vol. 25, No. 2, pp. 11901202 (2010). doi: 10.1109/TPWRD.2009.2034915
[4] Nguyen, T. H., Lee, D.-C. and Kim, C.-K., “A SeriesConnected Topology of a Diode Rectifier and a Voltage-Source Converter for an HVDC Transmission System,” IEEE Transactions on Power Electronics, Vol. 29, No. 4, pp. 15791584 (2014). doi: 10.1109/ TPEL.2013.2283368
[5] Cord, P., Hans-Gunter, E. and Hans-Joachim, K., “DFIG Wind Turbines Operating in a Fixed Reference Frame,” 17th European Conference on Power Electronics and Applications (EPE’15 ECCE-Europe), pp. 18 (2015). doi: 10.1109/EPE.2015.7309114
[6] Li, C., Zhan, P., Wen, J., Yao, M., Li, N. and Lee, W.-J., “Offshore Wind Farm Integration and Frequency Support Control Utilizing Hybrid Multiterminal HVDC Transmission,” IEEE Trans. Industry Applications., Vol. 50, No. 4, pp. 27882797 (2014). doi: 10.1109/ TIA.2013.2293818
[7] Deng, F. and Chen, Z., “Operation and Control of a DC-Grid Offshore Wind Farm under DC Transmission System Faults,” IEEE Transactions on Power Delivery, Vol. 28, No. 3, pp. 13561363 (2013). doi: 10.1109/ TPWRD.2013.2261561
[8] Vas, P., Electrical Machines and Drives A Space Vector Theory Approach. New York: Oxford Univ. Press (1992).
[9] Benadja, M. and Chandra, A., “Adaptive Sensorless Control of PMSGs-Based Offshore Wind Farm and VSC-HVDC Stations,” IEEE Journal of Emerging and Selected Topics in Power Electronics, Vol. 3, No. 4, pp. 918931 (2015). doi: 10.1109/JESTPE.2015.24 53113
[10] Ramasamy, B. K., Palaniappan, A. and Yakoh, S. M., “Direct-drive Low-speed Wind Energy Conversion System Incorporating Axial-type Permanent Magnet Generator and Z-source Inverter with Sensorless Maximum Power Point Tracking Controller,” IET Renewable Power Generation, Vol. 7, No. 3, pp. 284295 (2013). doi: 10.1049/iet-rpg.2012.0248
[11] Mesemanolis, A., Mademlis, C. and Kioskeridis, I., “Maximum Efficiency of a Wind Energy Conversion System with a PM Synchronous Generator,” 7th Mediterranean Conference and Exhibition on Power Generation, Transmission, Distribution and Energy Conversion, pp. 19 (2010). doi: 10.1049/cp.2010.0868
[12] Gimenez, R. B., Villalba, S., 1guez-D’Derl´ee, J. R., Perez, S. B. and Morant, F., “Diode-Based HVdc Link for the Connection of Large Offshore Wind Farms,” IEEE Transactions on Energy Conversion, Vol. 26, No. 2, pp. 615626 (2011). doi: 10.1109/TEC.2011.2114 886
[13] Musasa, K., Gitau, M. N. and Bansal, R. C., “Dynamic Analysis of DCDC Converter Internal to an Offshore Wind Farm,” IET Renewable Power Generation, Vol. 9, No. 6, pp. 542548 (2015). doi: 10.1049/iet-rpg. 2014.0420
[14] Ioinovici, A., Power Electronics and Energy Conversion Systems, Holon, Israel: Holon Inst. Technol. Vol. 1 (2013).
[15] Hsieh, Y.-P., Chen, J.-F., Liang, T.-J. and Lung-Sheng, “Novel High Step-Up DCDC Converter for Distributed Generation System,” IEEE Transactions on Industrial Electronics, Vol. 60, No. 4, pp. 14731482 (2013). doi: 10.1109/TIE.2011.2107721
[16] Yang, L.-S., Liang, T.-J. and Chen, J.-F., “Transformerless DCDC Converters with High Step-Up Voltage Gain,” IEEE Trans. Ind. Electron, Vol. 56, No. 8, pp. 31443152 (2009). doi: 10.1109/TIE.2009. 2022512
[17] Huang, C., Li, F. and Jin, Z., “Maximum Power Point Tracking Strategy for Large-Scale Wind Generation Systems Considering Wind Turbine Dynamics,” IEEE Transactions on Industrial Electronics, Vol. 62, No. 4, pp. 25302539 (2015). doi: 10.1109/TIE.2015.2395384
[18] Kim, H.-W., Kim, S.-S. and Koa, H.-S., “Modeling and Control of PMSG-based Variable-speed Wind Turbine,” Electric Power Systems Research, Vol. 80, pp. 4652 (2010). doi: 10.1016/j.epsr.2009.08.003