The Infona portal uses cookies, i.e. strings of text saved by a browser on the user's device. The portal can access those files and use them to remember the user's data, such as their chosen settings (screen view, interface language, etc.), or their login data. By using the Infona portal the user accepts automatic saving and using this information for portal operation purposes. More information on the subject can be found in the Privacy Policy and Terms of Service. By closing this window the user confirms that they have read the information on cookie usage, and they accept the privacy policy and the way cookies are used by the portal. You can change the cookie settings in your browser.
The paper is focused on reduction and balancing of power losses in a dual inverter. The proposed technique is based on finite control set model predictive control with two techniques which improve the behavior of the basic predictive algorithm to deal with different time constants in the system. The proposed algorithm uses approximation of the power losses by an exponential filter and furthermore,...
The proposed control method for dual converters combines two approaches as space vector PWM (SVPWM) and finite control set model predictive control (FCS-MPC). The SVPWM is used for suitable output voltage vectors preselection and the FCS-MPC enables using a mathematical model of the system and a proposed cost function to reduce power losses and to redistribute power losses among transistors. The suitable...
This paper introduces a new universal carrier-based pulse width modulation for multiphase converters based on a novel approach for the determination of modulation signals. They are calculated employing the minimum infinity-norm method which is in general suitable for underdetermined systems. The proposed approach minimizes the maximum element of solution vector and finds a unique one in the infinite...
This paper deals with a new control system based on finite control set model predictive control designed for a dual voltage source inverter. The proposed control systems deals with three objectives, the first one is the output current control depending on the load current demands, the second part of the control system is balancing of power losses among the semiconductor devices using redundant switching...
Overmodulation area of five-phase converters is covered by space vector PWM methods above all. The paper proposes a carrier-based PWM modulator employing the minimum infinity-norm method which is able to synthesize an arbitrary voltage vector in both, αβ and xy planes, respectively, which is advantageous besides the linear modulation area in the overmodulation zone as well. Thanks to the proposed...
This paper deals with a Sub-Hexagonal Centre PWM (SHCPWM) with variable switching sequence for a topology based on cascaded connection of two converters, so called dual inverter. The SHCPWM is enhanced to consider the last IGBT switching state representing the previous space vector and to balance and reduce power losses among the transistors. The proposed method is compared with the known SHCPWM with...
A new sensorless control algorithm for surface mounted permanent magnet synchronous machines with finite control set model predictive control (FCS-MPC) is proposed and its properties are analyzed. The FCS-MPC usually operates with a short sampling period, therefore the estimation algorithm needs to be computationally cheap. Moreover, injection of high frequency (hf) voltage signals into a given axis...
This paper deals with a proposal of a carrier redistribution PWM and its comparison with a phase disposition PWM (PDPWM) and carrier redistribution PWM for a multilevel converter dedicated to high power medium voltage electric drives. The converter topology is based on a cascaded connection of two-level inverters, the so called dual inverter. The well known phase disposition PWM for multilevel converters...
The aim of this paper is to present two different control approaches with injection of high frequency signals for estimation of rotor position and speed of a permanent magnet synchronous motor (PMSM) due its anisotropy. There are selected and modified two methods, a sliding mode control and a direct torque control which are not usually used for injecting high frequency signals because they do not...
A new control algorithm for operation of surface mounted permanent magnet synchronous machines in very low speed and standstill using finite control set model predictive control (FCS-MPC) and high frequency signal injection for estimation of the rotor position is proposed. Estimation of the rotor position is based on the standard injections of high frequency signal into the voltage command for a PWM...
This paper is concerned with design of a new general PWM method dedicated for multiphase converters. The proposed approach is based on the minimum infinity-norm solution which enables optimization of control signals for arbitrary number of phases with maximum dc-link utilization. The verification is performed for three and five phase converters by both simulations as well as experiments on laboratory...
The objective of this paper is to give an overview and comparison of control techniques for a three-level voltage source inverter based on dual connection of two-level converters supplied by two independent voltage sources. The compared modulation techniques are based on carrier based PWM, six step and space vector PWM with changeover of the inverters roles from clamping to switching inverter and...
This paper presents a new pulse width modulator dedicated basically for under determined systems. The solution of the under determined problem is performed by minimum 1-inflnity norm solution. One of known under determined system is a four-leg three-phase converter because four reference signals must be created from three control commands. The infinity norm enables to find proper solution to generate...
A new sensorless control algorithm for surface mounted permanent magnet synchronous machines with direct torque control (DTC) is proposed. The DTC usually operates with a short sampling period, therefore estimation algorithms need to be computationally cheap. Moreover, injection of high-frequency (hf) signals into a given axis can be a challenging task in comparison with a standard vector control...
The aim of this paper is to study the use of the Extended Kalman filer (EKF) for sensorless control of a permanent magnet synchronous motor (PMSM) drive controlled by direct torque control (DTC). The main drawback of DTC is the necessity of short sampling period. The challenge for the EKF is therefore the minimization of its execution time. This is achieved by using so called reduced state space model...
The aim of this paper is to study the use of the Extended Kalman filer (EKF) for sensorless control of a permanent magnet synchronous motor (PMSM) drive controlled by direct torque control (DTC). In contrast to the vector control, the DTC allows for better compensation of the dead-time effects, however, it also needs to run with much shorter sampling period. The challenge for the EKF is to minimize...
This paper presents a method for frequency analysis of traction drives supplied from a dc trolley wire with an input LC filter. The proposed method is suitable for frequency analysis of the traction drive in whole speed range and enables to find resonant or other observed harmonics in the operating drive circuit which could cause dangerous oscillations particularly at resonant frequencies of the power...
This paper is concerned with design of a speed and position estimator of a permanent magnet synchronous motor (PMSM) controlled by direct torque control (DTC). The designed estimator is based on a reduced-order Kaiman filter. The reduced-order Kaiman filter is computationally less demanding in comparison with a full model Kaiman filter, therefore it is suitable for use in the direct torque control...
This paper investigates two control platforms combining DSP and FPGA. The first platform is topologically designed as two boards and the second one as a single board. The proposed units are designed to control multilevel converters particularly. Both developed platforms are used in control system for a four level multilevel converter with flying capacitors and their behavior is investigated and evaluated...
This paper presents a new method of frequency characteristic measurement for ac drives connected to a dc trolley-wire. The input part of a drive is composed of an input LC filter. The LC filter is a naturally almost undamped circuit and any change in the circuit (e.g. voltage drop or constant power taken from the circuit) causes dangerous capacitor voltage oscillations. This method helps to find dangerous...
Set the date range to filter the displayed results. You can set a starting date, ending date or both. You can enter the dates manually or choose them from the calendar.