Query: nine switch inverter dual induction machine

Candidate papers:

abstract: Nine Switch Inverter (NSI) is a good alternative to two level three phase voltage source inverters (VSIs) when multiple loads exist in the system. Using multiple voltage source inverters is well known technique to drive multiple induction machines for multi drive systems. This increases total cost and volume of the system since more discrete components are required for designing the total system. On the other hand, Nine Switch Inverter provides promising solution to control multiple ac loads with less number of semiconductor switches. This converter has dual output and two ac loads can be controlled independently with no restriction. In this paper, model predictive control method is presented to control two induction machines using Nine Switch Inverter. The proposed method uses the mathematical model of the system to predict control objectives and solves multi objectives cost function to determine optimal control actuation. The performance of the predictive controller is evaluated by simulation work. According to simulation results, predictive controller provides good reference tracking capability in steady state and transient.
author_names: Ozan Gulbudak

Mustafa Gokdag
title: Predictive dual induction machine control using nine switch inverter for multi drive systems
venue: 2018 IEEE 12th International Conference on Compatibility, Power Electronics and Power Engineering (CPE POWERENG 2018)
year: 2018

abstract: Nowadays, multiphase induction drives are used in electric vehicle applications to improve reliability and efficiency. These induction motors are controlled by using a multiphase voltage source inverter (VSI) As the number of phases increases, the number of switching devices used in multiphase VSI also increases, which results in a reduction of the system efficiency and an increase in the cost. Among these multiphase drives, the six phase drive is used more frequently in electric vehicular industries. A conventional six phase VSI requires 12 switches to drive the six phase machine. Also, conventional six phase VSI requires more dc link voltage than the boost six phase VSI to drive the six phase machine. In order to overcome the problems associated with the conventional six phase VSI controlled six phase induction drives, this article proposes a nine switch boost inverter (NSBI) for six phase induction drive applications. The proposed NSBI has a single input dc voltage source, and it provides six phase ac output voltages. These six phase output voltages are regulated by using modified nonsinusoidal pulsewidth modulation (MNSPWM) technique. The proposed NSBI with a six phase induction motor is simulated using MATLAB/Simulink and validated using a field programmable gate array (FPGA) controlled hardware prototype. The verification of the proposed system during load torque variations and winding failure conditions is carried out.
author_names: Mohana Kishore Pinjala

Ravikumar Bhimasingu
title: Improving the DC Link Utilization of Nine Switch Boost Inverter Suitable for Six Phase Induction Motor
venue: IEEE Transactions on Transportation Electrification
year: 2020

abstract: This paper presents the direct torque control (DTC) scheme for symmetrical six phase induction machine by using Nine Switch Inverter (NSI) When this motor is controlled by conventional two level inverter, it provides 64 voltage vectors with switch count of 12. The proposed inverter is nine switch two level having capability to produce 27 voltage vectors. The DTC control is implemented with these available voltage vectors by this inverter and flux of xy subspace is eliminated for the performance improvement. The torque ripple reduction is achieved by using five level torque comparator. The performance is presented through simulation results and confirmed through hardware implementation.
author_names: Sohit Sharma

Mohan V Aware

Apekshit Bhowate
title: Direct torque control of symmetrical six phase induction machine using nine switch inverter
venue: 2017 IEEE Transportation Electrification Conference (ITEC India)
year: 2017

abstract: This paper investigates the performance of an asymmetrical six phase induction machine fed by a six phase nine switch voltage source inverter under both healthy and open motor phase cases. In the literature, the nine switch inverter topology is proposed as a suitable reduced switch count converter topology for six phase drives, where each pair of phases share the same converter leg. First, a brief summary about this topology along with its limitations are introduced. The six phase drive system topology is then investigated under both inverter and machine open circuit faults. Conventional rotor field oriented controller is employed as a controller platform for such a drive. Optimal current control is used under open phase conditions to ensure a certain optimization criterion, namely, minimum stator copper loss or maximum torque production. The system is investigated through a simulation study using MATLAB/SIMULINK.
author_names: Ahmed Salem

Ragi A R Hamdy

Ayman Samy Abdel-Khalik

Ibrahim F El-Arabawy

Mostafa S Hamad
title: Performance of nine switch inverter fed asymmetrical six phase induction machine under machine and converter faults
venue: 2016 Eighteenth International Middle East Power Systems Conference (MEPCON)
year: 2016

abstract: This paper introduces a new transformerless converter topology for Multiphase Based Wind Energy Conversion Systems (WECSs) In this topology, a twelve phase induction generator is integrated to the grid using dual Nine Switch Converters (NSCs) connected in series forming a high voltage cascaded dc link. For this generator phase number, this topology reduces the total number of semiconductor devices in the machine side converter by 25% than conventional topologies, where four three phase two level voltage source converters are typically needed. Moreover, it offers a high ac dc boosting capability, which facilities a transformerless system operation. The twelve phase induction generator can be regarded as dual symmetrical six phase windings with a spatial displacement of 30deg. Therefore, each NSC controls each six phase winding set. The dc link midpoint balancing is achieved based on controlling the (x y) current components of the two winding groups. The proposed topology and its control system are analyzed and simulated under different operating cases using MATLAB/SIMULINK.
author_names: Sherif M Dabour

Ayman Samy Abdel-Khalik

Shehab Ahmed

Ahmed M Massoud
title: A new dual series connected Nine Switch Converter topology for a twelve phase induction machine wind energy system
venue: 2017 11th IEEE International Conference on Compatibility, Power Electronics and Power Engineering (CPE POWERENG)
year: 2017

abstract: This paper describes a model predictive control method for Nine Switch Inverter (NSI) based AC drive systems. Two separate three phase AC loads (dual output mode operation) or a single six phase load (six phase mode operation) can be connected to output terminals of an NSI. Three different Finite Control Set Model Predictive Control (FCS MPC) strategies are presented and described. Firstly, dual output mode FCS MPC provides flexible control of detached load stages without any undesirable interaction. When disseminated loads are needed to be controlled, the output terminals of NSI are individually connected to separate load stages. Secondly, six phase mode FCS MPC provides robust control of six phase load current. Thirdly, the predictive control scheme for controlling multiple induction machines is presented. Experimental and simulation tests have demonstrated that the proposed method exhibits a secured converter operation. The proposed predictive control strategies of Nine Switch Inverter are accomplished using a Field Programmable Gate Arrays (FPGA)
author_names: Ozan Gulbudak

Mustafa Gokdag
title: Finite control set model predictive control approach of nine switch inverter based drive systems: Design, analysis, and validation.
venue: ISA transactions
year: 2020

abstract: Modern ship propulsion systems are looking towards to high efficiency electric drive systems. This work presents a new inverter configuration for multiphase AC drives for its application in Full Electric Ship (FEP) propulsion. Simulation results based on real hull dynamic data where carried out different load impacts and speed reversion in normal and stator winding faulty conditions.
author_names: Carlos A Reusser
title: Full electric ship propulsion, based on a dual nine switch inverter topology for dual three phase induction motor drive
venue: 2016 IEEE Transportation Electrification Conference and Expo (ITEC)
year: 2016

abstract: Induction motors are still popular in industries amongst the several types of motor due to its simple, robust and maintenance free construction. With the fast progress in transport industry the need exists for ac machines with higher power per unit. Six phase induction motor is a solution where higher power per volume is required such as for electric vehicle application. In this paper, six phase induction motor is operated by compact nine switch inverter. Space vector modulation technique is incorporated to operate nine switch inverter for six phase induction motor drive.
author_names: Chaitanya N Jibhakate

Madhuri A Chaudhari

Mohan M Renge
title: Space Vector Modulation of Nine Switch Inverter for Six Phase Induction Motor Drive
year: 2020

abstract: The Nine Switch Inverter (NSI) is a recently developed dual output converter. It can be used to drive two three phase loads independently. As a substitute to two separate conventional voltage source inverters, the NSI has been, already, proposed in various industrial applications to reduce the number of semiconductor switches and its associated energy losses and drive circuitry. On the other hand, the Direct Torque Control (DTC) is a robust control scheme of AC motors, which consist of selecting proper state vectors of a conventional voltage source inverter. The NSI, having a different working principle from the conventional voltage source inverter and taking into account the varying influence of active space vectors on motor's torque and stator flux, a Direct Torque Control is suggested in this paper to, efficiently, drive two induction motors independently, while minimizing the torque and stator flux ripples of both motors. Simulations results confirm the effectiveness of the proposed algorithm. In addition, application of this newly proposed control scheme in operation of an Electric Vehicule (EV) is demonstrated.
author_names: Draoui Abdelghani

Allaoua Boumediene
title: Direct Torque Control of Two Induction Motors Using the Nine Switch Inverter
year: 2018

abstract: Nine Switch Inverter (NSI) is composed of two conventional inverters with three common switches. Two sets of three phase ac loads can be connected to the outputs of NSI and independently controlled without any undesirable interaction. In conventional multi step Model Predictive Control (MPC) of a nine switch inverter, the prediction steps of both load stages must be equal. Unfortunately, this results in losing the freedom of selecting independent prediction horizon for individual loads. To overcome this problem, a novel asymmetrical multi step direct model predictive control method is presented in this paper. The proposed method finds two independent optimum solutions for each load to match with their utilization profile. It is assumed that two individual loads are controlled by two separate virtual inverters, and two separate model predictive control problems with their own prediction steps are solved to identify optimum control actions. The control calculations are performed in a Cyclone IV Field Programmable Gate Array (FPGA) by using a pipelined architecture. The system stability is analyzed using Lyapunov stability method. To highlight the effectiveness of introduced strategy, mathematical proof for controlling two separate loads with an asymmetrical prediction step is validated in experimentally.
author_names: Ozan Gulbudak

Mustafa Gokdag
title: Asymmetrical Multi Step Direct Model Predictive Control of Nine Switch Inverter for Dual Output Mode Operation
venue: IEEE Access
year: 2019