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Markov games can be used as a platform to deal with exogenous disturbances and parametric variations. In this work an attempt has been made to achieve a superior performance with fuzzy Markov game based control by hybridizing two game theory based approaches of ‘fictitious play’ and ‘minimax’. The work attempts a ‘safe yet consistent’ Markov game controller which advocates a minimax policy during...
This paper proposes a simulation model of an adaptive optimal control strategy for the traction drive of the hybrid electric vehicle. The control unit has to ensure the stability of the power network at different operating conditions. Moreover, the optimal design of the controller is required for the power management in order to reduce the energy losses during acceleration and braking processes. The...
The major drawback of usual dual three-phase AC machines, when supplied by a Voltage Source Inverter (VSI), is the occurrence of extra harmonic currents which circulate in the stator windings causing additional losses and constraints on the power component. This paper compares dedicated Pulse Width Modulation (PWM) strategies used for controlling a dual three-phase Permanent Magnet Synchronous machine...
This paper proposes a simple and effective scheme for Direct Torque Control (DTC) of Brushless DC Motor. Unlike the traditional DTC where both the torque and flux must to be employed in order to deliver the switching table for the inverter, the proposed DTC scheme utilizes only the torque information. By considering the particular operating principle of the motor, the instantaneous torque can be estimated...
Controlling an induction machine has been a difficult task since its invention, especially at low speed operation and during highly dynamic regimes, where the required torque/speed changes constantly. This paper aims to present the validation and implementation of a deadbeat direct torque and flux control scheme (DB-DTFC) for induction machines on a multilevel platform consisting on an FPGA, a real...
In recent years, there is an increasing interest in adopting synchronous reluctance machines for several applications. This is due to two main factors. The first is the increasing and highly variable cost of rare-earth permanent magnet (PM), such as NdFeB and SmCo. The second is the requirement for more efficient machines with respect to induction machines in general applications. However, a drawback...
In general, switched reluctance motors (SRMs) are driven by the unipolar current excitation. The conventional drive technique requires simultaneous optimization process for some controlled-parameters: the turn-on angle, turn-off angle, and current chopping level. The difficulty in the current command generation makes the torque controller design complicated. In the previous paper, to give a general...
Saturation strongly affects the performance of interior PM machines and thus the use of linear (constant parameter) equivalent-circuit models for such machines generally results in substantial errors. This paper investigates the use of a linear magnetic model which is combined with a flux-linkage limit, so that it corresponds to a flux density or saturation limit. The model is used to predict the...
This paper describes the identification of HRP-2 foot's dynamics. It is expected that a humanoid robot will work in the same environment as man. For that purpose, safety of operation is important. Although a simulator is used for confirming safe conditions of operation, an error may arise in a dynamic parameter by the robot of a simulator, and an actual robot. In this paper, it identified about the...
In this paper, a novel method for predicting the torque-speed characteristics of salient-pole synchronous machines (SPSM) is presented. These characteristics are commonly used as the basis for evaluating drives with variable operating ranges, e.g. traction drives for electric and hybrid electric vehicles. Such vehicles are often powered by permanent magnet synchronous machines (PMSM) which contain...
The paper focuses on the synchronous reluctance machine rotor design. The rotor's shape in this machine should maximize the flux passing in the d axis while minimizing the flux in its q axis. This can be achieved by designing the rotor to respect the natural flow of the flux in the d axis in order to reduce the magnetic resistance while increasing the insulation in the q axis. The proposed design...
A modified DC-link voltage balancing scheme is proposed, which keeps the two DC-link capacitor voltage differences at a desired level for wider load variation and for low power factor. Moreover, the proposed control strategy uses a reduced number of switching sequences compared to conventional DC-link voltage balancing strategy, which helps to reduce the switching losses. Effects of low power factor...
A flux-weakening predictive control algorithm (FWPC) is proposed in this paper with the aim of extending Constant-Power Speed Range (CPSR) of Surface-Mounted Permanent Magnet Synchronous Machines (SPMs). The proposed FWPC is developed on the basis of an accurate SPM sampled-data model and consists of appropriately exploiting the DC-link voltage reserve that is generally set aside for dynamic purpose...
A comparison of two passivity-based control strategies — with and without an integral control action — is proposed in this paper for the tracking control of a hydrostatic transmission, which is commercially used in working machines. An unknown leakage volume flow and a resulting load torque are taken into account as lumped disturbances. These disturbances and two unmeasurable state variables — the...
The electromagnetic torque ripple generated in the permanent magnet synchronous machine (PMSM), also called sideband torque ripple, due to space vector pulse-width modulation (SVPWM) excitation, is analytically investigated. The main sideband torque ripple components of the PMSM driven by a SVPWM voltage source inverter in a wind power generation system are first derived from the corresponding sideband...
Conventional single-vector-based model predictive torque control (MPTC) has been widely studied due to its intuitive concept and quick response. To improve the steady state performance, recently the concept of duty cycle control was introduced in MPTC by inserting a null vector along with an active vector during one control period. However, this still fails to reduce the torque error to a minimal...
In modern electrical drives all regulators are implemented in discrete-time domain. The design of current controller in the continuous time and its following discretization is a common and effective procedure as long as the ratio between the fundamental frequency and the sampling frequency remains sufficiently small. If this condition is violated, the performance of the closed loop system becomes...
This paper introduces the use of machine saliency as one of the parameters for the sizing of a three level inverter dc-link capacitor. A new nearest three vector (NTV) balancing algorithm is also introduced for the dc-link capacitors. A comparison between a two and three level inverter was conducted whereby the inverter input dc current for the two level inverter registered higher ripples than that...
Sensorless field oriented control has always been an area of study with many insecurities, parameter sensitivities and instabilities. In this paper, after giving a short overview of standard sensorless field oriented control algorithms, a new technology by Texas Instruments called “InstaSPIN” will be evaluated. InstaSPIN promises to solve all of the well-known problems of sensorless control as, weak...
This paper first extend the Fundamental PWM Excitation (FPE) sensorless control technique on Interior Permanent Magnet Synchronous Machine (IPMSM) and investigates the torque control bandwidth of three sensorless control schemes for Direct Torque and Flux Control (DTFC) for IPMSMs, including High Frequency (HF) Injection, Adaptive Sliding Mode Observer (SMO) and FPE. Through the frequency response...
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