Abstract
Cascade multilevel inverters have been developed for electric utility applications. A cascade M-level inverter consists of (M-1)/2 H-bridges in which each bridge's dc voltage is supported by its own de capacitor. The new inverter can: (1) generate almost sinusoidal waveform voltage while only switching one time per fundamental cycle; (2) dispense with multi-pulse inverters' transformers used in conventional utility interfaces and static var compensators; (3) enables direct parallel or series transformer-less connection to medium- and high-voltage power systems. In short, the cascade inverter is much more efficient and suitable for utility applications than traditional multi-pulse and pulse width modulation (PWM) inverters. The authors have experimentally demonstrated the superiority of the new inverter for power supply, (hybrid) electric vehicle (EV) motor drive, reactive power (var) and harmonic compensation. This paper summarizes the features, feasibility, and control schemes of the cascade inverter for utility applications including utility interface of renewable energy, voltage regulation, var compensation, and harmonic filtering in power systems. Analytical, simulated, and experimental results demonstrated the superiority of the new inverters.
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References
Akagi, H., Nabae, A. and Atoh, S., 1986. Control strategy of active power filters using multiple voltage-source PWM converters.IEEE Trans. Ind. Appl.,20(3): 460–466.
Carpita, M. and Teconi, S., 1991. A Novel Multilevel Structure for Voltage Source Inverter. EPE, p. 90–94.
Fujita, H., Tominaga, S. and Akagi, H., 1995. Analysis and Design of an Advanced Static Var Compensator Using Quad-Series Voltage-Source Inverters. IEEE/IAS Annual Meeting, Orlando, FL, p. 2565–2572.
Gyugyi, L. and Strycula, E. C., 1976. Active Ac Power Filters. IEEE/IAS Annual Meeting, p. 529–537.
Hochgraf, C., Lasseter, R., Divan, D. and Lipo, T. A., 1994. Comparison of Multilevel Inverters for Static Var Compensation. IEEE/IAS Annual Meeting, Denver, CO, p. 921–928.
Meynard, T. A. and Foch, H., 1993. Imbricated cells multilevel voltage-source inverters for high voltage applications.European Power Electronics Journal,3(2): 99–106.
Mohan, N. and Kamath, D. R., 1995. A Novel, High-Frequency, Per-Phase Static Var Compensator. IEEE/IAS Annual Meeting, Orlando, FL, p. 2581–2586.
Mori, S., Matsuno, K., Hasegawa, T., Ohnishi, S., Takeda, M., Seto, M., Murakami, S. and Ishiguro, F., 1992. Development of Large Static Var Generator Using Self-Commutated Inverters for Improving Power System Stability. IEEE PES Winter Power Meeting, New York, NY, Paper No. 92 WM165-1.
Nakamori, A. and Eguchi, N., 1994. DC Overvoltage Phenomenon of Multi-pulse Inverter Transformers for Utility Applications. 1994 National Convention Record IEE of Japan, Paper Number 552, p. 5–93.
Peng, F. Z., Akagi, H. and Nabae, A., 1990. A study of active power filters using quad-series voltage-source PWM converters for harmonic compensation.IEEE Trans. on Power Electronics,5(1): 9–15.
Peng, F. Z. and Lai, J. S., 1995. A Multilevel Voltage-Source Inverter with Separate DC Sources for Static VAR Generation. IEEE/IAS Annual Meeting, Orlando, FL, p. 2541–2548.
Peng, F. Z. and Lai, J. S., 1996a. Application Considerations and Compensation Characteristics of Shunt Active and Series Active Filters in Power Systems. Proceedings of the 7th International Conference on Harmonics and Quality Power, Las Vegas, NV, p. 12–20.
Peng, F. Z. and Lai, J. S., 1996b. Dynamic Performance and Control of a Static Var Compensator Using Cascade Multilevel Inverters. IEEE/IAS Annual Meeting. San Diego, CA, p. 1009–1015.
Peng, F. Z., McKeever, J. W. and Adams, D. J., 1997. A Power Line Conditioner Using Cascade Multilevel Inverters for Distribution Systems. IEEE/IAS Annual Meeting, New Orleans, LA.
Peng, F. Z. and Lai, J. S., 1997. Multilevel Cascade Voltage Source Inverter with Separate DC Sources. U. S. Patent #5,642,275.
Peng, F. Z. and Wang, J., 2003. A Novel Configuration of Unified Power Flow Controller. IEEE/APEC.
Schauder, C., Gernhardt, M., Stacey, E., Lemak, T., Gyugyi, L., Cease, T. W. and Edris, A., 1994. Development of a 100 MVAR Static Condenser for Voltage Control of Transmission Systems. IEEE PES Summer Power Meeting, San Francisco, CA, Paper No. 94 SM479-6PWRD.
Schauder, C. D., 1994. Advanced Static Var Compensator Control System. U.S. Patent: 5,329,221.
Seki, N. and Uchino, H., 1994. Which is Better at a High Power Reactive Power Compensation System, High PWM Frequency or Multiple Connection? IEEE/IAS'94 Annual Meeting, Denver, CO, p. 946–953.
Tolbert, L. M., Peng, F. Z. and Habetler, T. G., 1999. Multilevel converters for large electric drives.IEEE Transactions on Industry Applications,35(5): 36–44.
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Fang-zen, P., Zhao-ming, Q. Applications of cascade multilevel inverters. J. Zheijang Univ.-Sci. 4, 658–665 (2003). https://doi.org/10.1631/BF02851606
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DOI: https://doi.org/10.1631/BF02851606