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This work considers the problem of speed sensorless vector control of a three-phase PMSM using nonlinear control methods. An improved design of continuous sliding mode observer (SMO) is provided with a comprehensive analysis of sigmoid boundary layer to establish its relation with the estimation accuracy. The idea of cascaded SMO and high gain observer (HGO) is proposed for robust speed estimation...
A novel adaptive evolving Takagi-Sugeno (T-S) model identification method is investigated and integrated in a control architecture to control of nonlinear processes is investigated. The proposed system identification approach consists of two main steps: antecedent T-S fuzzy model parameters identification and consequent parameters identification. First, a new unsupervised fuzzy clustering algorithm...
A model of power demand represents the foundation of any intelligent Energy Management System, and its accuracy is the key factor determining the performance of such system. In order to improve the accuracy of the modeling process, a multi-model approach based on a Hierarchical Clustering of similar load behaviors is presented. The clustering algorithm joins similar data subsets in groups that are...
Digital controllers have several advantages with respect to their flexibility and design's simplicity. However, they are subject to problems that are not faced by analog controllers. In particular, these problems are related to the finite word-length implementation that might lead to overflows, limit cycles, and time constraints in fixed-point or floating-point processors. This paper proposes a new...
Dynamic states of a synchronous machine, i.e. rotor angle and rotor speed, are important variables for power system control, studies and analysis. Availability or estimating of these variables would help us to monitor effectively the stability condition of the power systems in order to develop local or wide-area control loop to improve power system stability and reliability. To estimate the rotor...
Load identification is an important issue in power system representations to ensure that simulations will reproduce the dynamic response of a system during a disturbance. For a load model to be accurate, its parameter must be appropriately estimated by a parameter fitness algorithm. The success of the estimation depends mainly on the availability of a good initial parameter guess. If it is not available,...
The paper presents a sensorless double-manifold sliding mode observer for the induction motor (EVI) drive. The observer is designed using an alternative state-space model of the EVI — it estimates the speed and the stationary frame fluxes of the motor. These are typically needed in an EVI direct field orientation control scheme. First, the paper presents the alternative state-space model of the IM...
An approach to machine modeling by using finite reluctances is proposed. The finite reluctance approach is well suited for fast modeling and dynamic simulation of electrical machines in general and of fractional-slot surface-mounted permanent magnet machines in particular. The latter usually have very large air gap and slots, with relevant leakage and large tangential components of flux density in...
A self-tunning adaptive control scheme for application to Switched Reluctance (SR) Motors is investigated in this work. The control gains of the proposed Pi-based control scheme are functions of the motor current and speed error signals. A second order nonlinear model of an SR Motor is considered to design the controller. The model is linearized around a nominal operation point to tune the controller...
The Switched Reluctance Machine (SRM) is known for being one of the oldest electric machine designs. Unfortunately, it is usually assumed that this implies that the machine is outdated. However with the advent of microprocessors, the SRM has become a suitable option for a number of applications because the shortcomings of the machine can be mitigated with control. Compared to other machines, the SRM...
In this paper a practical demonstration for simultaneous lévitation and rotation for a ferromagnetic object is presented. A hollow steel cylinder of 59 gm mass is arranged to remain suspended stably under I-core electromagnet utilizing DC electromagnetic levitation principle and then arranged to rotate the levitated cylinder around 1000 rpm speed based on eddy current based energy meter principle...
High frequency (HF) sinusoidal voltage injection is a common method to estimate the initial rotor position of permanent magnet synchronous machines (PMSM). When a HF sinusoidal voltage is injected into d-axis, the saturation of magnetic field in d-axis can lead to HF current response including harmonics. This paper makes a detailed analysis on the harmonic current response. Based on the analysis,...
This paper proposes an improved sensorless matrix-converter IPMSM drive system using a high frequency injection method. By suitably choosing different virtual dc-bus voltages and compensating the duty cycle of the switching states, the estimated position error can be obviously reduced. A 32-bit digital signal processor, TMS-320LF-2407A, is used to execute the rotor position estimation and the whole...
This paper describes a new sensorless control using self-dynamics without an external signal injection. Instead of the signal injection, it utilizes the self-dynamics of the control loop that inherently adjusts the magnitude of inverters current and voltage in the switching frequency range. Due to no existence of the external signal, the proposed method provides several advantages including reduction...
This paper proposes a multimotor drive based on a commercial three-leg converter. The topology is composed by a standard three-leg converter supplying two machines in a parallel connection. A Permanent-magnet synchronous motor (PMSM) and Single-phase induction motor (SPIM) are used in this work. The configuration is suitable for applications which is required independent control of two machines from...
This paper presents an ac-dc-ac reversible nine-phase machine drive system. The grid side converter is composed of Y-connected single-phase bridges. As the machine is composed of three three-phase groups, a three-leg converters are connected separately to each group. The topology does not make use of input isolation transformers and reduces the power processed by converter switches when compared to...
In this paper a novel adaptive Maximum Torque per Ampere (MTPA) control scheme of an interior permanent magnet synchronous machine (IPMSM) is introduced. To avoid an on- or off-line numerical calculation of the reference current for the MTPA curve, a reference model of the torque which is equivalent to the IPMSM with zero d-axis current is utilized to enforce the torque of the IPMSM towards its reference...
This paper describes position estimation method for interior permanent magnet synchronous motor (IPMSM) using idea of pattern matching technique. High frequency signal injection methods are conventional method of sensorless vector control for IPMSM in standstill and very low speed region. Those methods are used when the value of phase inductance can be assumed to be a sinusoidal function of rotor...
This paper presents an improved position-sensorless field-oriented control strategy for a surface-mount permanent magnet synchronous motor (PMSM). In this algorithm, a high-pass filter (HPF) has been applied to the rotor flux estimation to solve the DC drift or offset problem caused by the integration part. The rotor position and speed signal extraction is achieved by mean of a phase-lock loop (PLL)...
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