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This paper presents the design of new controller and modeling for a single phase inverter that must operate in island mode or disconnected from the grid within a microgrid. The inverter model is presented in small signal and the current loop controller and the comparative between two controllers for the voltage loop are designed. Considering that in this mode of operation the aim is to maintain the...
In traditional grid-connected inverter control strategies, the dual-loop current control system is widely used and quite effective. However, the grid impedance is mainly inductive with uncertainty in weak grid. Its value varies with wide range which the traditional control system performance will be effected seriously, even unstable. When a control system such as the grid-connected inverter system...
Admittance control is a well-established and popular control strategy in modern robotics. However, the standard admittance controller has several limitations. First, the passivity can be guaranteed by finding a set of control parameters that makes the admittance function positive real. However, this approach cannot be applied to multi degrees-of-freedom robot because it requires transfer function...
Several data-driven design methods for a feedback controller for an unknown plant were studied. The data conversion method (DCM), which is one of the methods, has improved the design ability for more various plants by using a new approach. This paper applies the revised DCM to a two degree of freedom controller. First, the paper discusses a theory when applying DCM to a two degree of freedom controller...
The importance of energy-efficient DC voltage conversionis ever increasing. This demands for advanced topologiessuch as time-interleaved multiphase DC-DC converters. Anessential part of such a converter is the control loop, which not only regulates the output voltage, but also balances the currents of the individual phases. In this paper, a small-signal model of a two-phase buck converter is derived,...
In this paper, we study a formation control scheme that achieves a tight formation in a 1D platoon. The scheme achieves constant inter-vehicle spacings (with no transient) for almost every vehicle pair whenever there are no disturbances. We build up from the basic leader following approach with a modification in the weight selection. In particular, each member tracks the movement of its immediate...
In many modern engineered systems, including Cyber-Physical Systems, there may be many interacting components with coupled dynamics. Our prior work has shown that such systems exhibit fractional-order dynamics, which may serve as a concise model for such very high-order systems. This paper extends that prior work to a more general class of systems in which the operator describing the dynamics of the...
In this paper we consider the proportional-integral (PI) controller and the problem of modern design using gain margin, phase margin and bandwidth as simultaneous specifications. We develop analytical approaches to deal with these specifications leading to the generation of a design surface which displays all achievable designs as well as the various tradeoffs inherent to the problem. The key supporting...
This paper is focused on the optimal design of the controllers in an active filtering and regeneration system for DC railway traction substation. The control algorithm of the system is based on the indirect current control method and uses two closed loops with PI controllers: an outer one for the DC voltage control and the other for the grid current control. In order to perform the energy regeneration...
This article propose a hybrid fractional order PIDcontroller which is optimized with classical proportional integralderivative controller (PID) gives an exquisite response. Here thetwo tuning method are used to evaluate the parameters of PIDcontroller, first one is Ziegler-Nichols and other one is Astrom-Hagglund method. The parameters of FO-PID controller in useas the proportional constant, integral...
To represent an iterative optimization technique for designing a fractional order PID (FOPID) controller based on a smith predictor (SP) is the main objective of this paper. Here, the long dead time compensating smith predictor based control scheme is proposed. Withal, the difficulty of using FOPID controller shoots up, as this controller hinges two extra terms i.e. derivative order and integral order...
Droop-controlled inverters are widely employed as power sources in three-phase AC power electronics system, such as distributed generation, while the interaction between the source and the load may lead overall system to be unstable. Terminal-characteristics based stability criteria are very attractive for analyzing the stability of three-phase AC power electronics system. However, the systems, composed...
This work proposes the usage of a repetitive-based control to dynamically restore the voltage applied to sensitive and critical loads of power systems. Besides, sag and voltage swells, the proposed control can intrinsically mitigate harmonic distortions. Furthermore, the filter is able to work out on sinusoid references and, thus, avoids the need of employing the dq transform. A recursive least-squares...
Multiple unit of PFC converters can be utilized for better power quality in the residential applications. It is important to set proper amount of reactive power contribution from each unit of PFC converter to reduce power loss and increase stability. To set the referenced amount of reactive power contribution for each PFC converter, a dynamic supervisory controller is necessary. In this paper, a wireless...
In this paper, the application of a multiphase interleaving DC-DC converter in the drivetrain of an electric vehicle is studied. At first, a method for controlling the converter is proposed which ensures its operation under variable switching frequency and changing of the number of active phases. The implemented cascade control is designed with the help of a small signal model of the multiphase converter...
The main purpose of this article is to present and describe the advantages of the MFC/IMC structure utilization in control of BLDC motor. The results of the analysis included in this work compare two-loop control structure containing internal model of the process with classical single-loop structure with PID controller, which is commonly used in control of industrial motors. In the framework of conducted...
This paper researches on modeling and design of quasi-Z-source inverter (q-ZSI) applied for PMSM drive system. Using state-space average method, the small-signal model and steady model are builded. Based on the mathematical model of PMSM and q-ZSI, the control systems of dc-link voltage and stator current are designed. The bandwidth of dc-link system is limited to reduce the interference between them...
The root-locus method is often employed when a controller that can find its gains is designed. Usually the method is used to determine only one design parameter. However most controllers for industrial applications have more than one controller gain: for example proportional-integral-derivative (PID) controllers have three controller gains, P, I, and D. As the root-locus technique cannot complete...
A motor controller based on STM32F103 MCU, which is designed for the patient transfer apparatus is presented. Firstly, according to the working principle of the apparatus, the power of the motor is calculated, and the selection of the motor is carried out. According to the chosen motor, the controller's hardware circuit design is carried out. According to the need of apparatus control, the controller...
This paper presents the regenerative braking design control and simulation of a hybrid energy storage system (HESS) for an electric vehicle (EV). The EV is driven by two 30 kW permanent magnet synchronous motors. The HESS contains a Li-Ion battery and an Ultra-Capacitor (UC) sources. In extreme braking conditions, the UC should be able to recover all the power delivered by the motors. When the maximal...
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