Abstract
Neutral point (NP) voltage imbalance is a natural problem with three-level converters, the neutral point voltage is coordinated by zero-sequence voltage injection based on SPWM. The effect of the sixth harmonic injection on the NP voltage is analyzed based on SPWM, in this paper. The NP voltage can be controlled by superimposing sixth harmonic on the modulated wave. The total fluctuation of the NP voltage is related to the injected harmonic amplitude in one modulation wave period. When the injected harmonics are not zero, the NP voltage will shift over time. A sixth harmonic is constructed to control the NP voltage based on SPWM and a novel NP voltage control method based on sixth harmonic injection is proposed. This method is simple and easy to implement. A NP voltage control model is established in matlab to verify that the control algorithm is valid. Simulation results verify the effectiveness of the proposed method.
This is a preview of subscription content, log in via an institution to check access.
Access this chapter
Tax calculation will be finalised at checkout
Purchases are for personal use only
Similar content being viewed by others
References
Lee, J., Lee, K.: Time-offset injection method for neutral-point ac ripple voltage reduction in a three-level inverter. IEEE Trans. Power Electron. 31(3), 1931–1941 (2016)
Beig, A.R., Narayanan, G., Ranganathan, V.T.: Modified SVPWM algorithm for three level VSI with synchronized and symmetrical waveforms. IEEE Trans. Ind. Electron. 54(1), 486–494 (2007)
Gupta, A.K., Khambadkone, A.M.: A simple space vector PWM scheme to operate a three-level NPC inverter at high modulation index including over-modulation region, with neutral point balancing. IEEE Trans. Ind. Appl. 43(3), 751–760 (2007)
Lee, J.S., Lee, K.B.: Time-offset injection method for neutral-point AC ripple voltage reduction in a three-level inverter. IEEE Trans. Power Electron. 31(3), 1931–1941 (2016)
Maheshwari, R., Munk-Nielsen, S., Busquets-Monge, S.: Design of neutral-point voltage controller of a three-level NPC inverter with small DC-link capacitors. IEEE Trans. Ind. Electron. 60(5), 1861–1871 (2013)
Zaragoza, J., Pou, J., Ceballos, S.: Voltage-balance compensator for a carrier-based modulation in the neutral-point-clamped converter. IEEE Trans. Ind. Electron. 56(2), 305–314 (2009)
Deng, Y., Harley, R.G.: Space-vector versus nearest-level pulse width modulation for multilevel converters. IEEE Trans. Power Electron. 30(6), 2962–2974 (2015)
Zhu, R., Wu, X., Tang, Y.: Duty cycle-based three-level space-vector pulse-width modulation with overmodulation and neutral-point balancing capabilities for three-phase neutral-point clamped inverters. IET Power Electron. 8(10), 1931–1940 (2015)
Author information
Authors and Affiliations
Editor information
Editors and Affiliations
Rights and permissions
Copyright information
© 2022 The Author(s), under exclusive license to Springer Nature Singapore Pte Ltd.
About this paper
Cite this paper
Gong, B. (2022). NP Voltage Control Strategy Based on 6th Harmonic Injection for Three-Level Converter. In: Jia, L., Qin, Y., Liang, J., Liu, Z., Diao, L., An, M. (eds) Proceedings of the 5th International Conference on Electrical Engineering and Information Technologies for Rail Transportation (EITRT) 2021. EITRT 2021. Lecture Notes in Electrical Engineering, vol 864. Springer, Singapore. https://doi.org/10.1007/978-981-16-9905-4_7
Download citation
DOI: https://doi.org/10.1007/978-981-16-9905-4_7
Published:
Publisher Name: Springer, Singapore
Print ISBN: 978-981-16-9904-7
Online ISBN: 978-981-16-9905-4
eBook Packages: EngineeringEngineering (R0)