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This paper presents a discrete time torque observer and an extended H∞ filter to estimate the rotor speed and position in a permanent magnet machine. Those estimated variables are key components of a robust sensorless controller for the machine when it is associated with a wind turbine emulator test-rig. In addition, an iterative maximum power point tracking algorithm is proposed for maximum efficiency...
This paper proposes an adaptive full-order Sliding Mode Observer (SMO) for the rotor speed and position estimation in the Permanent Magnet Synchronous Generator (PMSG). A full-order terminal SMO is designed to make the estimated stator current track the actual stator current, and eliminate the chattering. Furthermore, A back Electro Motive Force (EMF) observer adopts adaptive control to estimate the...
This paper presents a direct phase current controller for a two phase synchronous machine. Firstly, the machine is modelled in three domains : the electrical domain, the electromagnetic domain and the mechanical domain. Secondly, a linearised model is deduced for the RS controller coefficient determination. The performance is enhanced with the introduction of a model observer to compensate the system...
Observers are used in relation to several controllers: IFOC, sensor-less drives and for fault detection but they have not been used yet for predictive control of drives. This paper shows the benefits of incorporating a rotor current observer to enhance the predictions needed for predictive control of stator currents in VSI driven IM. The new scheme is compared with the standard one in which non-measurable...
This paper proposed a robust H∞ fault estimation method and a fault-tolerant control(FTC) of vapor compression cycle(VCC) systems. Based on a moving boundary model(MBM), linearization and model reduction were conducted. Actuator faults were estimated by a proportional-integral(PI)-observer and it was designed using a H∞ estimation theory. Robust fault-tolerant controller was designed using a convex...
In the field of high-precision position control, the position response requires that there is no vibration. However, a permanent magnet synchronous motor (PMSM) has a wide variety of torque-ripple components, including cogging torque and flux harmonics, which degrade the control performance. Typically, these components are defined as a disturbance torque, and compensation is accomplished by using...
Water heating applications consume a considerable portion of electricity demand in most of countries. Small wind turbines are one of attractive alternatives for grid electricity based water heating systems. Wind energy can be converted to heat energy in a high efficient manner. However it is essential that wind turbine based water heating systems should be economical and reliable. Maximum power point...
In this paper, a decoupled hybrid control of velocity and tension is applied to cold rolling system with a disturbance observer in simulation. This innovative method controls the strip tension and line speed independently in orthogonally-crossed two modal spaces: the differential mode and the common mode. In the proposed system, even if the operator changes the line speed, the target tension is maintained...
This paper proposes a novel design method of disturbance observer (DOB) and reaction force observer (RFOB) for acceleration-based bilateral control (ABC) utilizing DC brushed motor (abbreviated as DC motor later). ABC is one of the control method to enable the transmission of haptic sensation between master and slave robots. In order to transmit highly precise haptic sensation, both DOB and RFOB are...
Elastic joints in 2-mass drive systems, may lead to torsional oscillation which is usually rectified by reducing the bandwidth of control system. In order to improve the control performance, feedback signals from all the states are required. All the states of a drive system with a flexible coupling cannot be easily measured so it is usually necessary to estimate some of the system states using appropriate...
This paper presents a novel two channel control law for high transparency teleoperation under time delay with guaranteed delay independent L2 stability. Four channel controllers have long been known to provide transparent teleoperation when time delay does not exist on the communication channels. However under time delay, a trade-off between delay and transparency must be made to make the system stable...
This paper focuses on storage and reproduction systems for environmental haptic sensations. A large force vibration is caused by the differential of viscosity momentum in the reproduction system based on force control. To solve this problem, the reproduction system based on momentum control has been proposed in previous our research. The improved reproduction system has a configuration that the momentum...
Recently, a soft robot considering the contact of the human has attracted attention, and the zero stiffness torque control is required. Because a soft robot causes vibration at the load side, vibration suppression control of a soft robot is required. In this paper, the authors discuss position control and torque control of a soft robot by using a torsion torque sensor based on a resonance ratio control...
Energy production or critical applications need fault tolerant operation. Six-phase induction machine (SC6PIG) increases the reliability by allowing the loss of up to 3 phases. Associated with a relevant novel control able to adapt itself to the new configuration, operation can keep on under fault. A novel strategy of control is here proposed with sensorless control. This strategy nonetheless focus...
This paper proposes a sensorless stator flux observer for the direct torque control (DTC) scheme of interior permanent magnet synchronous motors (IPMSMs) drives in the very low speed region including standstill. The stator flux observer comprises the voltage model augmented by the current model. The position information required by the current model is obtained by a separate rotor position estimator...
This paper aims to propose a fallback system isolated from man-in-the-middle attack (MITM) for networked control systems. In this paper, fallback is an incident response of the control system in which facilities are preferentially protected and a minimal system operates during MITM. Since the communication contents of the networked control systems can be tampered with by MITM, the proposed system...
Flexible AC Transmission System (FACTS) component is available to manage a number of varied situations of the power line. The Unifier Power Flow Controller (UPFC) as one of the FACTS is used in order to keep conditions of the power line. The UPFC consists of two inverters. One is connected in parallel to the power line, the other is connected in series. In parallel side, the reactive power can be...
This study aimed to compare color categorization characteristics of color vision deficient (CVD) observers with those of normal trichromat (NT) observers. In order to investigate the effects of color luminace and the use of perceptual judgements on color categorization properties, the experiment carried out at three luminance levels by using two experimental tasks, a color-naming task (CNT) and a...
In this paper, a control method to improve the static stability of two-wheeled wheel chair is proposed. The two-wheeled wheel chair is the wheel chair without caster wheels, and moves and stabilizes with only two wheels. It has good operability and capability to go over a step. However, two-wheeled wheel chair has difficulty in statical stabilization because of the structure. In this paper, the steering...
With the increase in aging population of many developed countries, the demand of walking or standing assist device has grown. This paper presents structure and control system of novel assist device, Intelligent Tension Pole (ITP), to assist walking and standing in room considered supporting for self-reliance, space saving, and stability. Two-wheel and one-wheel are added to lower and upper ends of...
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