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1. A fixed-switching-frequency Sliding Mode Current Controller for Mutually Coupled Switched Reluctance Machines using Asymmetric Bridge Converter

   Hu, Kun ; Ye, Jin ; Velni, Javad ; Guo, Lulu ; Yang, Bowen. ( June 2019 , IEEE Transportation Electrification Conference and Expo)

   In this paper, an integral sliding mode current controller (SMC) is proposed for mutually coupled switched reluctance motors (MCSRM) using asymmetric bridge converters aiming to achieve constant switching frequency and lower sampling rate. A generalized state-space model is built and then the design of a sliding mode controller along with the stability analysis of the closed-loop system are presented. The effectiveness of SMC is verified using simulation studies with a three-phase, sinusoidal excitation 12/8 MCSRM over a wide speed range. Compared to the hysteresis current control, the proposed SMC based design approach demonstrates a comparable response in terms of currents ripples, the root-mean-square error of current and torque while achieving a constant switching frequency and lower sampling rate. 

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2. A fixed-switching-frequency Sliding Mode Current Controller for Mutually Coupled Switched Reluctance Machines using Asymmetric Bridge Converter

   Hu, Kun ; Ye, Jin ; Velni, Mohammadpour ; Guo, Lulu ; Yang, Bowen. ( June 2019 , IEEE Transportation Electrification Conference and Expo)

   In this paper, an integral sliding mode current controller (SMC) is proposed for mutually coupled switched reluctance motors (MCSRM) using asymmetric bridge converters aiming to achieve constant switching frequency and lower sampling rate. A generalized state-space model is built and then the design of a sliding mode controller along with the stability analysis of the closed-loop system are presented. The effectiveness of SMC is verified using simulation studies with a three-phase, sinusoidal excitation 12/8 MCSRM over a wide speed range. Compared to the hysteresis current control, the proposed SMC-based design approach demonstrates a comparable response in terms of currents ripples, the root-mean-square error of current and torque while achieving a constant switching frequency and lower sampling rate. 

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3. Model Predictive Current Control of Mutually Coupled Switched Reluctance Machines using a Three-Phase Voltage Source Converter

   Hu, Kun ; Guo, Lulu ; Ye, Jin ( March 2020 , IEEE Applied Power Electronics Conference)

   In this paper, a model predictive current controller (MPCC) is proposed for short-pitched mutually coupled switched reluctance machines (MCSRMs) using a three-phase voltage source converter (VSC) to achieve fast dynamics and advanced current tracking ability. Due to strong mutually coupling between phases, to our knowledge, MPCC for MCSRMs has not been studied yet. A two-order flux-based prediction model of the MCSRMs using the VSC is presented with standard state space equations in discrete-time domain, based on which, the current regulation is achieved by solving a constrained optimization problem. With the receding optimal duty ratio input, MPCC demonstrates good current tracking ability, which is verified by simulations with a three-phase, sinusoidal excitation 12/8 MCSRM. Compared to hysteresis current control, the current response with MPCC bears lower current ripples and a fixed switching frequency. 

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4. A Design Algorithm for Multivariable Linear Quadratic Integral Controllers in Voltage-Source Converters

   Lopez, Andres F ; Patarroyo, Juan F ; Sanabria, Enrique A ; Campo, Daniel D ; Vasquez, Jesus D ; Andrade, Fabio ( January 2020 , IECON 2020 is the 46th Annual Conference of the IEEE Industrial Electronics Society)

   This paper presents a voltage control design algorithm for a three-phase voltage source converter (VSC) connected to a linear load using a passive LCL filter. The controller is based on an optimal regulator, combined with the integral of the voltage error, which is called LQI that achieves null tracking of the error. The main objective of this paper is to present an algorithm to design a voltage controller through frequency analysis of the singular values of the system, the weight of the states involved in the system, the movement of the closed poles and their respective step response to evaluate performance and robustness against load changes. The simulation results show a satisfactory operation of the voltage controller with fast recovery after a resistive load change 

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5. Sliding Mode Control Scheme of a Cascaded H-Bridge Multilevel Active Front End Rectifier

   https://doi.org/10.1109/PEDG51384.2021.9494173  

   Jean-Pierre, Garry ; Altin, Necmi ; Nasiri, Adel ( June 2021 , 2021 IEEE 12th Annual International Symposium on Power Electronics for Distributed Generation Systems)

   In this study, a sliding mode control (SMC) scheme is proposed for the single-phase cascaded H-bridge (CHB) multilevel active front end (AFE) rectifier with LCL filter. A PI controller is employed to control the DC voltage of the rectifier modules and to obtain the amplitude for the reference grid current. The SMC based current control scheme uses the grid current and filter capacitor voltage feedbacks. The resonance of the LCL filter is damped using the voltage feedback of the capacitor. Therefore, the requirement for additional damping circuitry is removed. Simulation and experimental results are presented to verify the performance of the SMC for the CHB multilevel AFE rectifier. The overall proposed control scheme provides almost unity power factor and fast transient response. It is seen from the results that the current drawn from the grid is in sinusoidal waveform with low THD. 

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