TY - JOUR
T1 - Model Predictive Control of LC-Filtered Voltage Source Inverters with Optimal Switching Sequence
AU - Zheng, Changming
AU - Dragicevic, Tomislav
AU - Zhang, Zhenbin
AU - Rodriguez, Jose
AU - Blaabjerg, Frede
N1 - Funding Information:
Manuscript received May 7, 2020; revised July 16, 2020; accepted August 5, 2020. Date of publication August 11, 2020; date of current version October 30, 2020. The work of Jose Rodriguez was supported by the ANID through Projects FB0008, ACT192013, and 1170167. Recommended for publication by Associate Editor R. Kennel. (Corresponding author: Changming Zheng.) Changming Zheng is with the College of Control Science and Engineering, China University of Petroleum (East China), Qingdao 266580, China (e-mail: jsxzzcm@126.com).
Publisher Copyright:
© 1986-2012 IEEE.
Copyright:
Copyright 2020 Elsevier B.V., All rights reserved.
PY - 2021/3
Y1 - 2021/3
N2 - Voltage source inverters with output LC filter enable a sinusoidal output voltage with low harmonics, suitable for islanded ac microgrid or uninterruptible power supply applications. Conventional finite-set model predictive voltage control (MPVC) applies only a single switching vector per control period, leading to a variable switching frequency and significant output ripple. This article resolves these issues by proposing an improved MPVC with optimal switching sequence (OSS-MPVC). First, an improved vector switching sequence is defined, aiming to reduce the output-voltage ripple with a constant switching frequency. Then, to tackle the difficulty in extending the OSS to high-order systems due to the coupling effect of the output filter, a generalized 'one-step estimation' solution is proposed, which directly associates the control-variable gradients with the vector switching sequence. To further enhance the output-voltage tracking accuracy, intersample dynamics are taken into account in the cost function. The control delay and dead-time compensation are also considered. Simulations and experimental results verify the feasibility of the proposed method.
AB - Voltage source inverters with output LC filter enable a sinusoidal output voltage with low harmonics, suitable for islanded ac microgrid or uninterruptible power supply applications. Conventional finite-set model predictive voltage control (MPVC) applies only a single switching vector per control period, leading to a variable switching frequency and significant output ripple. This article resolves these issues by proposing an improved MPVC with optimal switching sequence (OSS-MPVC). First, an improved vector switching sequence is defined, aiming to reduce the output-voltage ripple with a constant switching frequency. Then, to tackle the difficulty in extending the OSS to high-order systems due to the coupling effect of the output filter, a generalized 'one-step estimation' solution is proposed, which directly associates the control-variable gradients with the vector switching sequence. To further enhance the output-voltage tracking accuracy, intersample dynamics are taken into account in the cost function. The control delay and dead-time compensation are also considered. Simulations and experimental results verify the feasibility of the proposed method.
KW - Fixed switching frequency
KW - inverters
KW - microgrid
KW - model predictive control (MPC)
KW - optimal switching sequence (OSS)
UR - http://www.scopus.com/inward/record.url?scp=85095684390&partnerID=8YFLogxK
U2 - 10.1109/TPEL.2020.3015540
DO - 10.1109/TPEL.2020.3015540
M3 - Article
AN - SCOPUS:85095684390
VL - 36
SP - 3422
EP - 3436
JO - IEEE Transactions on Power Electronics
JF - IEEE Transactions on Power Electronics
SN - 0885-8993
IS - 3
M1 - 9165198
ER -