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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...
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 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...
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...
In this paper, a dead-beat direct torque and flux control with a novel sliding-mode stator flux observer is proposed for electric vehicle (EV) drives. Compared to the direct torque control, the proposed scheme exhibits both static and dynamic performances. Since the system parameters have impact on the control effect of the permanent magnet synchronous motor (PMSM) deadbeat-direct torque control (DB-DTC)...
This paper proposes a controller design method using modeling-error feedback to improve steady-state performance for a system with time delay. The controller is designed based on the mixed H2/H∞ control assuring the stability condition with Lyapunov-Krasovskii functional. The proposed method resolves the problem of steady-state error due to model error which the conventional method using a communication...
In the recent times, the number of amateur farmers has been increasing. Although amateur farmers use tillers, they may find it difficult to drive the tiller along a straight line. There is a need for electric tillers with independent drive wheels. This paper proposes straight control incorporating human driving input by using a disturbance observer. Numerical simulation results and experimental results...
The researches have been ongoing on various vibration control methods for resonant system. Reflected wave rejection-based vibration control is one of the vibration control for resonant system which considers high order resonances owing to the wave equation. However, the conventional reflected wave rejection-based vibration control mainly focuses on the position control, the torque/force control of...
In this paper, a model based robust control for three-phase three-level Neutral Point Clamped (NPC) power converters is studied. Based on the continuous averaged model of the system, a Second Order Sliding Mode (SOSM) technique is employed to the control design. The control objectives are to achieve desired dc-link capacitor voltage regulation, voltage balance in the two dc-link capacitors and the...
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