Journal Press India^®

Author Details ( * ) denotes Corresponding author

This article provides a generic technique for per phase DC bus voltage balancing that might be used in a CMI based STATCOM. The STATCOM system parameter model and the conventional control technique are examined first. A per phase DC bus voltage balancing mechanism is detailed using a dq/abc park transformation and the loop-gain shaped control design technique. This approach aims to maintain a constant DC bus voltage. The dc capacitor may be controlled globally by a proportional resonant controller. A controller that rejects disturbances may be used to regulate clustered loads. By facing a number of challenging tasks at the point of aggregate generally, including balancing the DC voltage and accounting for reactive power. If these problems can be handled, the system’s supremacy could be increased. This article describes the general control arrangement in order to increase the system’s reliability. This system may accomplish reactive power compensation and dc link voltage balancing by using the nine-level cascade multilevel inverter as STATCOM. One particular topic has been emphasised repeatedly throughout the text.

Keywords

CMI; STATCOM; Facts Devices; DC Voltage

1. Ghias, A.M.Y.M.; Pou, J.; Ciobotaru, M.; Agelidis, V.G., "Voltage balancing strategy for a five-level flying capacitor converter using phase disposition PWM with sawtooth-shaped carriers," in IECON 2012 - 38th Annual Conference on IEEE Industrial Electronics Society , vol., no., pp.5013-5019, 25-28 Oct. 2012.
2. Malinowski, M.; Gopakumar, K.; Rodriguez, J.; Pérez, M.A., "A Survey on Cascaded Multilevel Inverters," in Industrial Electronics, IEEE Transactions on , vol.57, no.7, pp.2197-2206, July 2010.
3. Lu, Z.-G.; Zhao, L.-L.; Zhu, W.-P.; Wu, C.-J.; Qin, Y.-S., "Research on cascaded three-phase-bridge multilevel converter based on CPS-PWM," in Power Electronics, IET, vol.6, no.6, pp.1088-1099, July 2013
4. Rodriguez, J.; Jih-Sheng Lai; Fang Zheng Peng, "Multilevel inverters: a survey of topologies, controls, and applications," in Industrial Electronics, IEEE Transaction , vol.49, no.4, pp.724-738, Aug 2002.
5. Sepahvand, H.; Jingsheng Liao; Ferdowsi, M.; Corzine, K.A., "Capacitor Voltage Regulation in Single-DC-Source Cascaded H-Bridge Multilevel Converters Using Phase-Shift Modulation," in Industrial Electronics, IEEE Transactions on , vol.60, no.9, pp.3619-3626, Sept. 2013.
6. Townsend, C.; Summers, T.J.; Betz, R.E., "Comparison of modulation strategies for a cascaded H-bridge StatCom — Part 1: Theoretical background," in IECON 2010 - 36th Annual Conference on IEEE Industrial Electronics Society , vol., no., pp.2019-2024, 7-10 Nov. 2010
7. Xiaotian Zhang; Spencer, J.W., "Study of Multisampled Multilevel Inverters to Improve Control Performance," in Power Electronics, IEEE Transactions on , vol.27, no.11, pp.4409-4416, Nov. 2012.
8. Waltrich, G.; Barbi, I., "Three-Phase Cascaded Multilevel Inverter Using Power Cells With Two Inverter Legs in Series," in Industrial Electronics, IEEE Transactions on , vol.57, no.8, pp.2605-2612, Aug. 2010.
9. Mc Grath, B.P.; Holmes, D.G., "Multicarrier PWM strategies for multilevel inverters," in Industrial Electronics, IEEE Transactions on , vol.49, no.4, pp.858-867, Aug 2002.
10. Marquez, A.; Leon, J.I.; Vazquez, S.; Franquelo, L.G., "Advanced control of a multilevel cascaded H-bridge converter for PV applications," in Industrial Electronics Society, IECON 2014 - 40th Annual Conference of the IEEE , vol., no., pp.4548-4553, Oct. 29 2014-Nov. 1 2014.
11. Townsend, C.D.; Summers, T.J.; Vodden, J.; Watson, A.J.; Betz, R.E.; Clare, J.C., "Optimization of Switching Losses and Capacitor Voltage Ripple Using Model Predictive Control of a Cascaded H-Bridge Multilevel StatCom," in Power Electronics, IEEE Transactions on , vol.28, no.7, pp.3077-3087, July 2013.
12. Marzoughi, A.; Neyshabouri, Y.; Imaneini, H., "Control scheme for cascaded H-bridge converter-based distribution network static compensator," in Power Electronics, IET , vol.7, no.11, pp.2837-2845, 11 2014.
13. Dieckerhoff, S.; Bernet, S.; Krug, D., "Power loss-oriented evaluation of high voltage IGBTs and multilevel converters in transformerless traction applications," in Power Electronics, IEEE Transactions on , vol.20, no.6, pp.1328-1336, Nov. 2005.
14. C. Han et al., "An ETO Thyristor and Modular H-bridge PWM Converter-based 4.5MVA STATCOM: 480V/500A Transformerless Grid-Connected Experimentation," Conference Record of the 2006 IEEE Industry Applications Conference Forty-First IAS Annual Meeting, Tampa, FL, 2006, pp. 1039-1044.
15. Yiqiao Liang and C. O. Nwankpa, "A new type of STATCOM based on cascading voltage-source inverters  with phase-shifted unipolar SPWM," in IEEE Transactions on Industry Applications, vol. 35, no. 5, pp. 1118-1123, Sep/Oct 1999.
16. Zeng Guang, Yang Bo and Zhong Yanru, "Cascaded multilevel STATCOM DC capacitor voltage balance method based on CPS-PWM," Power Engineering and Automation Conference (PEAM), 2011 IEEE, Wuhan, 2011, pp. 276-278.
17. Y. Li and B. Wu, "A Novel DC Voltage Detection Technique in the CHB Inverter-Based STATCOM,"  in IEEE Transactions on Power Delivery, vol. 23, no. 3, pp. 1613-1619, July 2008.