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In automotive industry space is extremely limited. The efficient and fast control of electric motors is a key technology to save energy and space. This paper shows strategies to improve energy consumption of a redundant Voltage Source Inverter (VSI) and an associated double three-phase Permanent Magnet Synchronous Motor (PMSM). Focus is to significantly reduce the DC link power dissipation of the...
The design process of converters usually requires investigations with different abstraction levels. In this paper, an analytical calculation tool for dual-active-bridge DC-to-DC converters is introduced. This tool is used during a pre-simulation design stage. Its calculations are based on idealized current shapes. One of the most important advantages is the high calculation speed: the tool is faster...
Power control is important in the operation of dc microgrid, particularly for the power sharing between different types of power sources including PV, wind power generation systems. In this paper, an effective control scheme for dc microgrid with energy storage system (ESS) is proposed. The power sharing scheme using two ESSs in a dc microgrid for stable operation is proposed. Detailed effective control...
This paper outlines performance prediction of 6/3 Switched Reluctance Motor (SRM) with flux reversal free stator. The performance analysis of the motor is done under both electrical and mechanical aspects. In electrical regards, the electromagnetic analysis is done in static and dynamic conditions. This predicts the flux path, flux distribution and elimination of flux reversal in the stator, which...
This paper presents a robust nonlinear control method for interior permanent magnet synchronous motors (IPMSM) based on maximum torque per ampere (MTPA) with harmonic injection. Third harmonic injection is employed for increased utilization of supply potential and reduced motor current harmonic distortion. Global asymptotic stability of the drive is demonstrated through Lyapunov stability criterion...
This paper presents development and control of buck fed buck converter topology for high current application. For high current application like DC welding, single converter structure may cause complete system failure if the semiconductor switch fails. Hence, to improve reliability, parallel DC-DC converter structure is proposed in this paper. This arrangement ensures load sharing between the converters...
AlGaN/GaN-based fin-shaped field-effect transistors (FinFETs) with very steep sidewall and various fin-widths (Wfin) have been fabricated by utilizing electron-beam lithography and additional anisotropic sidewall wet etch in TMAH solution. The device with Wfin of 150 nm exhibits normally-on performance with threshold voltage of −2.5 V, suppression of current collapse phenomenon, low gate leakage current...
A new 600V high-voltage IC (HVIC) featuring a high noise tolerance is proposed. The purpose of the proposed HVIC is to achieve the high noise tolerance without an increase of the fabrication cost. The basic device concept is to arrange a P-separation layer around the high-side control part, which is called a new self-shielding structure, to reduce a hole current injection under the condition of negative...
Field Oriented Control (FOC) of induction motor drive is more popular in process and manufacturing industries as it controls the motor as desired. To perform FOC, Variable Voltage Variable Frequency (VVVF) operation of an inverter, connected in the stator or rotor circuit (in case of wound rotor) of the machine, is mandatory. For VVVF control, the rotor speed and stator currents have to be measured...
This paper presents a programmable gate driver unit for power semiconductors such as IGBTs and MOSFETs which allows to adjust the gate voltage and gate resistance for turn-on and turn-off of the power semiconductor independently. As properties of the gate driver have a major influence on the switching behavior of power semiconductors and thus on switching losses and EMI, it is highly desirable to...
This paper describes a high speed drive system for textile rotor spinning applications with individually driven spinning units. High energy efficiency and lifetime is obtained by utilization of a slotless electronically commutated PM motor and active magnetic bearings for rotor suspension. Compared to traditional, centralized driven machines the proposed configuration allows a rotor design open at...
In this paper, a three-level neutral-point-clamped (NPC) inverter based filter capacitor supported integrated distribution static compensator (DSTATCOM) topology is proposed for load compensation using modified control algorithm. A three-phase four wire low voltage distribution system is taken into consideration with non-stiff source. The suggested topology is realized using three-level NPC voltage...
This paper presents a configuration and a control strategy for dynamic voltage restorer (DVR). In order to compensate the voltage of each phase separately, a closed-loop PI control law in the d-q reference frame is proposed. The proposed method provides a fast response and effective sag compensation capabilities. In addition, in order to detect voltage sag, a linear Kalman filter is employed to estimate...
Based on the topology of back-to-back convertor, a regenerative braking strategy used for Permanent Magnet Synchronous Motor (PMSM) is presented in this paper. According to this strategy, without dc link braking resistor, PMSM can operate in four-quadrants stably, and switch in different quadrants continuously. Based on Model Reference Adaptive System (MRAS) theory, a rotational inertia online-observer...
This paper deals with the design of a passively damped magnetic bearing system in a special construction form powered by a BLDC Motor. Special attention was given to the optimization of the mechanical system in order to minimize oscillation amplitudes due to unbalanced excitation and decay times. In addition, the main components of the presented drive, the magnetic bearings and the BLDC-motor, were...
Modular Multilevel Converter (MMC) is considered a promising topology in medium and high voltage class STATCOM for its scalability, modularity, low THD, etc. However, the output THD of MMC-STATCOM increases due to the reduction of sub-module number in medium voltage class. To solve this problem, an improved Nearest-Level-Modulation aiming to create more output voltage level is introduced in this paper...
This paper presents adaptive control structure applied for electrical drive with elastic coupling between motor and load machine. The main speed controller is based on neuro-fuzzy model. Proposed control structure works using all state variables of the two-mass system. Feedbacks coefficients have been calculated analytically. Information about state variables is given by the Luenberger observer. For...
This paper presents a steady-state analysis for the bidirectional dual active bridge (DAB) dc-dc converter operating in extended-phase-shift (EPS) control by proposing a new model that produces equations for RMS and average device currents, and RMS and peak inductor/transformer currents. The DAB converter performance is evaluated based on the mathematical model, focusing on zero-voltage switching...
In the paper an adaptive fuzzy logic control based structure for damping of torsional vibrations is proposed. Firstly, the commonly-used control methodologies for two-mass drive system are presented. Then the mathematical model of the plant is introduced shortly. Next the adaptive control structure with fuzzy PID controller is described in detail. The computational effort of fuzzy controller is reduced...
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