EPE Association: EPE 2017 - LS4b: Control Techniques for Power Converters III

EPE 2017 - LS4b: Control Techniques for Power Converters III
You are here: EPE Documents > 01 - EPE & EPE ECCE Conference Proceedings > EPE 2017 ECCE Europe - Conference > EPE 2017 - Topic 03: Measurement and Control > EPE 2017 - LS4b: Control Techniques for Power Converters III

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   A Hybrid Designed Digital Dual-Loop Control of High Power Ground Power Unit (GPU)
By Mahmoud NOURI [View]
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Abstract: 400 Hz inverters, known as Ground Power Units (GPUs), are widely used in aviation and marine industry.Due to their approximately eight times higher fundamental frequency, 400 Hz inverters are much moresensitive to practical delays such as sampling delays, when compared to traditional 50-60 Hz inverters.Conventional controllers designed for 50-60 Hz inverters, therefore, must be redesigned to properly addressa different sampling rate issue. This paper proposes a modified dual cascade control loop applicable to 400Hz inverters. The inverter topology has been modified by placing the filter inductor at the input side oftransformer. Therefore, in the resulting configuration, the inductor current will serve as a new feedbackvariable with less harmonic content. The control system employs a proportional and a resonant controllerdesigned in digital and analog domains, respectively, which is a new design approach compared to theexisting methods resulting in enhanced performance of the 400 Hz GPU. In addition, a feedforward blockhas been added to the overall typical dual loop scheme to decouple the control variables from load currentdisturbances and improve the dynamic response of the inverter. An optimized smooth noise-robustderivative has also been introduced to improve the noise immunity. Simulations and experimental resultson a 20 kVA prototype GPU show the validity of the proposed scheme to provide high-performancetransient and steady state responses.

   Design of Controller for Inverters with Ultra-Low THD: A Repetitive and Predictive-PID Controller Approach
By Bunyamin TAMYUREK [View]
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Abstract: This paper presents a design and an implementation of inverters with ultra-low total harmonic distortion (THD) under all kinds of loads. In this study, the ultra-low THD objective is achieved by combining theadvantages of the repetitive controller, the predictive-PID controller and the reference signal feedforwarding method in a multi-loop structure. The high performance uninterruptible power supply(UPS) and the transformer test converter applications where the ultra-low THD is desired require theuse of high performance controllers. This study successfully achieves the design of such a controller bymeans of computer simulation, which is based on the true model of the inverter system. The tuning ofthe controller and inverter parameters made through simulation has yielded a successful hardware designand a good performance during the experimental tests. The performance of controller is evaluated interms of output voltage waveform distortion under actual linear and nonlinear loads. The experimentalresults that demonstrate the success of the controller are obtained from the voltage source inverters (VSI)built for a three-phase UPS application at 30 kVA and a transformer test converter application at 300kVA. The maximum measured THD is less than 2.88\% under the worst nonlinear load case. Theconverters employing the designed controller are currently in use with success in the field.

   Hybridization schemes for particle swarm iterative learning controllers in repetitive systems
By Bartlomiej UFNALSKI [View]
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Abstract: Two novel hybridization schemes for the particle swarm repetitive controller (PSRC) are developed and tested herein. They are designed to be used in power electronic converters, such as grid-tie converters or constant-amplitude constant-frequency (CACF) true sine wave inverters, as well as in motion control systems, especially in assembly line robots. The proposed control algorithms combine the good responsiveness of the classic deterministic iterative learning controller (ILC) with the robustness offered by the evolutionary population-based swarm controller. Properties of the control algorithms are illustrated in the CACF inverter using computer simulations. One out of the schemes is then employed in the three-phase grid-tie converter to facilitate sinusoidal currents under the distorted grid voltage conditions. A weakness not manifested in the case of the CACF inverter, however clearly apparent in the case of the grid-tie converter if envisaged to interface a superconducting magnetic energy storage (SMES), is identified. The concept of an adaptive evaporation rate for the PSRC is then investigated to enhance the performance of the original hybrid repetitive controller. This is to facilitate the controller's future deployment in the power electronic interface for an SMES system where learning should last at most a few seconds instead of tens of seconds.

   Improved Particle Swarm Optimization Algorithm and Its Application in Power Electronic Controller
By Zishun PENG [View]
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Abstract: The traditional particle swarm optimization (PSO) algorithm has been used to optimize inverter controller parameters. However, there are some disadvantages when the quantity and optimization interval of inverter controller parameters increase, such as easily falling into local optimum, and optimization convergence problems. An improved PSO algorithm with multi-swarm and multi-velocity (MMPSO) is proposed in this paper. It is made of three kinds of different particle groups and three kinds of velocity update methods. Comparing with the traditional PSO algorithm, the combination of multi-swarm and multi-velocity of the MMPSO can effectively improve optimization ability of traditional PSO algorithm. Various off-line optimization models of single phase inverter systems are established to compare MMPSO and other PSO algorithms. The experimental results validate the validity and correctness of MMPSO.

EPE 2017 - LS4b: Control Techniques for Power Converters III
You are here: EPE Documents > 01 - EPE & EPE ECCE Conference Proceedings > EPE 2017 ECCE Europe - Conference > EPE 2017 - Topic 03: Measurement and Control > EPE 2017 - LS4b: Control Techniques for Power Converters III
	[return to parent folder]

	A Hybrid Designed Digital Dual-Loop Control of High Power Ground Power Unit (GPU) By Mahmoud NOURI	[View] [Download]
Abstract: 400 Hz inverters, known as Ground Power Units (GPUs), are widely used in aviation and marine industry.Due to their approximately eight times higher fundamental frequency, 400 Hz inverters are much moresensitive to practical delays such as sampling delays, when compared to traditional 50-60 Hz inverters.Conventional controllers designed for 50-60 Hz inverters, therefore, must be redesigned to properly addressa different sampling rate issue. This paper proposes a modified dual cascade control loop applicable to 400Hz inverters. The inverter topology has been modified by placing the filter inductor at the input side oftransformer. Therefore, in the resulting configuration, the inductor current will serve as a new feedbackvariable with less harmonic content. The control system employs a proportional and a resonant controllerdesigned in digital and analog domains, respectively, which is a new design approach compared to theexisting methods resulting in enhanced performance of the 400 Hz GPU. In addition, a feedforward blockhas been added to the overall typical dual loop scheme to decouple the control variables from load currentdisturbances and improve the dynamic response of the inverter. An optimized smooth noise-robustderivative has also been introduced to improve the noise immunity. Simulations and experimental resultson a 20 kVA prototype GPU show the validity of the proposed scheme to provide high-performancetransient and steady state responses.

	Design of Controller for Inverters with Ultra-Low THD: A Repetitive and Predictive-PID Controller Approach By Bunyamin TAMYUREK	[View] [Download]
Abstract: This paper presents a design and an implementation of inverters with ultra-low total harmonic distortion (THD) under all kinds of loads. In this study, the ultra-low THD objective is achieved by combining theadvantages of the repetitive controller, the predictive-PID controller and the reference signal feedforwarding method in a multi-loop structure. The high performance uninterruptible power supply(UPS) and the transformer test converter applications where the ultra-low THD is desired require theuse of high performance controllers. This study successfully achieves the design of such a controller bymeans of computer simulation, which is based on the true model of the inverter system. The tuning ofthe controller and inverter parameters made through simulation has yielded a successful hardware designand a good performance during the experimental tests. The performance of controller is evaluated interms of output voltage waveform distortion under actual linear and nonlinear loads. The experimentalresults that demonstrate the success of the controller are obtained from the voltage source inverters (VSI)built for a three-phase UPS application at 30 kVA and a transformer test converter application at 300kVA. The maximum measured THD is less than 2.88\% under the worst nonlinear load case. Theconverters employing the designed controller are currently in use with success in the field.

	Hybridization schemes for particle swarm iterative learning controllers in repetitive systems By Bartlomiej UFNALSKI	[View] [Download]
Abstract: Two novel hybridization schemes for the particle swarm repetitive controller (PSRC) are developed and tested herein. They are designed to be used in power electronic converters, such as grid-tie converters or constant-amplitude constant-frequency (CACF) true sine wave inverters, as well as in motion control systems, especially in assembly line robots. The proposed control algorithms combine the good responsiveness of the classic deterministic iterative learning controller (ILC) with the robustness offered by the evolutionary population-based swarm controller. Properties of the control algorithms are illustrated in the CACF inverter using computer simulations. One out of the schemes is then employed in the three-phase grid-tie converter to facilitate sinusoidal currents under the distorted grid voltage conditions. A weakness not manifested in the case of the CACF inverter, however clearly apparent in the case of the grid-tie converter if envisaged to interface a superconducting magnetic energy storage (SMES), is identified. The concept of an adaptive evaporation rate for the PSRC is then investigated to enhance the performance of the original hybrid repetitive controller. This is to facilitate the controller's future deployment in the power electronic interface for an SMES system where learning should last at most a few seconds instead of tens of seconds.

	Improved Particle Swarm Optimization Algorithm and Its Application in Power Electronic Controller By Zishun PENG	[View] [Download]
Abstract: The traditional particle swarm optimization (PSO) algorithm has been used to optimize inverter controller parameters. However, there are some disadvantages when the quantity and optimization interval of inverter controller parameters increase, such as easily falling into local optimum, and optimization convergence problems. An improved PSO algorithm with multi-swarm and multi-velocity (MMPSO) is proposed in this paper. It is made of three kinds of different particle groups and three kinds of velocity update methods. Comparing with the traditional PSO algorithm, the combination of multi-swarm and multi-velocity of the MMPSO can effectively improve optimization ability of traditional PSO algorithm. Various off-line optimization models of single phase inverter systems are established to compare MMPSO and other PSO algorithms. The experimental results validate the validity and correctness of MMPSO.