Publisher : The Korean Institute of Power Electronics
DOI : 10.6113/JPE.2016.16.3.1176
Title & Authors
A Novel Control Scheme for T-Type Three-Level SSG Converters Using Adaptive PR Controller with a Variable Frequency Resonant PLL Lin, Zhenjun; Huang, Shenghua; Wan, Shanming;
In this paper, a novel quasi-direct power control (Q-DPC) scheme based on a resonant frequency adaptive proportional-resonant (PR) current controller with a variable frequency resonant phase locked loop (RPLL) is proposed, which can achieve a fast power response with a unity power factor. It can also adapt to variations of the generator frequency in T-type Three-level shaft synchronous generator (SSG) converters. The PR controller under the static α-β frame is designed to track ac signals and to avert the strong cross coupling under the rotating d-q frame. The fundamental frequency can be precisely acquired by a RPLL from the generator terminal voltage which is distorted by harmonics. Thus, the resonant frequency of the PR controller can be confirmed exactly with optimized performance. Based on an instantaneous power balance, the load power feed-forward is added to the power command to improve the anti-disturbance performance of the dc-link. Simulations based on MATLAB/Simulink and experimental results obtained from a 75kW prototype validate the correctness and effectiveness of the proposed control scheme.
Proportional-resonant control;Quasi direct power control;Resonant phase locked loop;Shaft synchronous generator;T-type there-level converter;
J. Prousalidis, C. Patsios, F. Kanellos, A. Sarigiannidis, N. Tsekouras, and G. Antonopoulos, "Exploiting shaft generators to improve ship efficiency," Electrical Systems for Aircraft, Railway and Ship Propulsion (ESARS), pp. 1-6, 2012.
J.-S. Lee and K.-B. Lee, “Open-switch fault tolerance control for a three-level NPC/T-Type rectifier in wind turbine systems,” IEEE Trans. Ind. Electron., Vol. 62, No. 2, pp. 1012-1021. Feb. 2015.
M. Schweizer and J. W. Kolar, “Design and implementation of a highly efficient three-level t-type converter for low-voltage applications,” IEEE Trans. Power Electron., Vol. 28, No. 2, pp. 899-907, Feb. 2013.
P. Alemi, S.-Y. Jeong, and D.-C. Lee, “Active damping of LLCL filters using pr control for grid-connected three-level T-type converters,” Journal of Power Electronics, Vol. 15, No. 3, pp. 786-795, May 2015.
W. Zhang, Y. Hou, X. Liu, and Y. Zhou, “Switched control of three-phase voltage source PWM rectifier under a wide-range rapidly varying active load,” IEEE Trans. Power Electron., Vol. 27, No. 2, pp. 881-890, Feb. 2012.
C.-L. Xia, Z. Xu, and J.-X. Zhao, “A new direct power control strategy for NPC three-level voltage source rectifiers using a novel vector influence table method,” Journal of Power Electronics, Vol. 15, No. 1, pp. 106-115, Jan. 2015.
S. Kwak and J.-C. Park, “Model-predictive direct power control with vector preselection technique for highly efficient active rectifers,” IEEE Trans. Ind. Informat., Vol. 11, No. 1, pp. 44-52 . Feb. 2015.
Z. Song, Y. Tian, W. Chen, Z. Zhu, and Z. Chen, “Predictive duty cycle control of three-phase active-front-end rectifiers,” IEEE Trans. Power Electron., Vol. 31, No. 1, pp. 698 -710, Jan. 2016.
Z.-X. Zou, K. Zhou, Z. Wang, and M. Cheng, “Frequency-adaptive fractional-order repetitive control of shunt active power filters,” IEEE Trans. Ind. Electron., Vol. 62, No. 3, pp. 1659-1668, Mar. 2015.
L. Hang, S. Liu, G. Yan, B. Qu, and Z.–Y. Lu, “An improved deadbeat scheme with fuzzy controller for the grid-side three-phase pwm boost rectifier,” IEEE Trans. Power Electron., Vol. 26, No. 4, pp. 1184-1191, Apr. 2011.
R. Guzman, L. G. de Vicuña, J. Morales, M. Castilla, and J. Matas, “Sliding-mode control for a three-phase unity power factor rectifier operating at fixed switching frequency,” IEEE Trans. Power Electron., Vol. 31, No. 1, pp. 758-769, Jan. 2016.
J. Dannehl, C.Wessels, and F.W. Fuchs, “Limitations of Voltage-oriented PI current control of grid-connected PWM rectifiers with LCL filters,” IEEE Trans. Ind. Electron., Vol. 56, No. 2, pp. 380-388, Feb. 2009.
X. Bao, F. Zhuo, Y. Tian, and P. Tan, “Simplified feedback linearization control of three-phase photovoltaic inverter with an LCL filter,” IEEE Trans. Power Electron., Vol. 28, No. 6, pp. 2739-2752, Jun. 2013.
N. He, D. Xu, Y. Zhu, J. Zhang, G. Shen, Y. Zhang, J. Ma, and C. Liu, “Weighted average current control in a three-phase grid inverter with an LCL filter,” IEEE Trans. Power Electron., Vol. 28, No. 6, pp. 2785-2797, Jun. 2013.
H. Kim, M. W. Degner, J. M. Guerrero, F. Briz, and R. D. Lorenz, “Discrete-time current regulator design for ac machine drives,” IEEE Trans. Ind. Appl., Vol. 46, No. 4, pp. 1317-1324, Jul. 2010.
L. Yin, Z. Zhao, T. Lu, S. Yang, and G. Zou, “An improved DC-link voltage fast control scheme for a PWM rectifier-inverter system,” IEEE Trans. Ind. Appl., Vol. 50, No. 1, pp. 1669-1675, Jan. 2014.
A. Calle-Prado, S. Alepuz, J. Bordonau, J. Nicolas-Apruzzese, P. Cortés, and J. Rodriguez, “Model predictive current control of grid-connected neutral point clamped converters to meet low voltage ride through requirements,” IEEE Trans. Ind. Electron., Vol. 62, No. 3, pp. 1503-1514, Mar. 2015.
Y. Jia, J. Zhao, and X. Fu, “Direct grid current control of LCL-filtered grid-connected inverter mitigating grid voltage disturbance,” IEEE Trans. Ind. Electron., Vol. 29, No. 3, pp. 1532-1541, Mar. 2014.
G. Shen, X. Zhu, J. Zhang, and D. Xu, “a new feedback method for PR current control of LCL-filter-based grid-connected inverter,” IEEE Trans. Ind. Electron., Vol. 57, No. 6, pp. 2033-2041, Jun. 2010.
B. Li, W. Yao, L. Hang, and L. M. Tolbert, “Robust proportional resonant regulator for grid-connected voltage source inverter (VSI) using direct pole placement design method,” IET Power Electron., Vol. 5, No. 8, pp. 1367-1373, Vol. 5, 2012.
Q. Guo, H. Liu, and Y. Zhang, “A new control strategy for a three-phase PWM current-source rectifier in the stationary frame,” Journal of Power Electronics, Vol. 15, No. 4, pp. 994-1005, Jul. 2015.
A. Vidal, F. D. Freijedo, A. G. Yepes, P. Fernandez-Comesana, J. Malvar, Ó. Lopez, J. Doval-Gandoy, “Assessment and optimization of the transient response of proportional-resonant current controllers for distributed power generation systems,” IEEE Trans. Ind. Electron., Vol. 60, No. 4, pp. 1367-1383, Apr. 2013.
A. Timbus, M. Liserre, R. Teodorescu, P. Rodriguez, F. Blaabjerg, “Evaluation of current controllers for distributed power generation systems,” IEEE Trans. Power Electron. Vol. 24, No. 3, pp. 654-664, Mar. 2009.
L. Cao, K. H. Loo, and Y. M. Lai, “Frequency-adaptive filtering of low-frequency harmonic current in fuel cell power conditioning systems,” IEEE Trans. Power Electron., Vol. 30, No. 4, pp. 1966-1978, Apr. 2015.
A. Uphues, K. Notzold, R. Wegener, and S. Soter, "Frequency adaptive PR-controller for compensation of current harmonics," Industrial Electronics Society, IECON 2014-40th Annual Conference of the IEEE, 2014.
F. D. Freijedo, A. G. Yepes, J. Malvar, O. Lopez, P. Fernandez-Comesana, A. Vidal, J. Doval-Gandoy, “Frequency tracking of digital resonant filters for control of power converters connected to public distribution systems,” IET Power Electron., Vol. 4, No. 4, pp. 454-462, Apr. 2011.
L.-Y. Yang, C.-L. Wang, J.-H. Liu, and C.-X. Jia, “A novel phase locked loop for grid-connected converters under non-ideal grid conditions,” Journal of Power Electronics, Vol. 15, No. 1, pp. 216-226, Jan. 2015.
K.-J. Lee, J.-P. Lee, D. Shin, D.-W. Yoo, and H.-J. K., “A novel grid synchronization PLL method based on adaptive low-pass notch filter for grid-connected PCS,” IEEE Trans. Ind. Electron., Vol. 61, No. 1, pp. 292-301, Jan. 2014.
F. Gonzalez-Espin, E. Figueres, and G. Garcera, “An adaptive synchronous-reference-frame phase-locked loop for power quality improvement in a polluted utility grid,” IEEE Trans. Ind. Electron., Vol. 59, No. 6, pp. 2718-2731, Jun. 2012.
D. Dong, B. Wen, D. Boroyevich, P. Mattavelli, and Y. Xue, “Analysis of phase-locked loop low frequency stability in three-phase grid-connected power converters considering impedance interactions,” IEEE Trans. Ind. Electron., Vol. 62, No. 1, pp. 310-321, Jan. 2015.
A. Yepes, F. Freijedo, J. Doval-Gandoy, O. Lopez, J. Malvar, and P. Fernandez-Comesana, “Effects of discretization methods on the performance of resonant controllers,” IEEE Trans. Power Electron., Vol. 25, No. 7, pp. 1692-1712, Jul. 2010.