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.
This paper investigates topologically independent vector modulation for multilevel converters. The investigate vector modulation is Space Vector PWM (SVPWM) which was implemented in FPGA and also tested in development board MLC interface with low-voltage prototype of three-level Neutral Point Clamped (3L-NPC) converter. The main advantages and disadvantages which were found out during implementation...
The paper propose a novel Space Vector Pulse Width Modulation (SVPWM) for two stage two-phase matrix converter with four legs fed two-phase induction motor (TPIM). Proposed control technique reduce number of switching, switching losses and therefore increase efficiency. Comparison of simulated and measured stator currents THD and efficiency comparison of two stage matrix converter controlled by SVPWM...
This paper adopted the variable switching frequency PWM (VSFPWM) control to the SPMSM and combined the VSFPWM with SVPWM and DPWM. A power loss model was built to quantitatively compare the system efficiency at CSF/VSF SVPWM and CSF/VSF DPWM. Simulation and experimental validations were pursued on a 5kW surfaced-mounted permanent synchronous motor (SPMSM) drive system.
To suppress zero-sequence circulating current in parallel operating inverters with common DC power supply, this paper proposes a new strategy based on Dual-carrier SVPWM and proportional resonant (PR) control, which use two opposite active vectors instead of zero vectors to suppress the higher frequency circulating current and reduces the lower frequency circulating current by means of zero-sequence...
This paper presents a model predictive strategy for a three-phase, two-level Voltage Source Inverter (VSI) and three-level Diode-Clamped Converters (DCCs) with AC filter for Renewable Energy Systems (RES) applications. The renewable energy systems model is used in this paper to investigate the system performance when power is supplied to Resistive-Inductive load (RL-load). This strategy allows for...
This paper presents the experimental evaluation of a flux linkage-based inverter loss model embedded in a deadbeat-direct torque and flux control (DB-DTFC) that achieves desired torque and minimizes losses over each switching period. The optimal flux commands are selected from those that will achieve the desired torque by using embedded dynamic flux linkage-based loss models of the machine and inverter...
This paper presents a new, simple and generalized approach to calculate flying capacitor currents for an n-level flying capacitor converter without the use of look-up tables. The performance of the proposed method has been studied for a three-, four- and five-level flying capacitor converter in MATLAB/Simulink environment.
Multilevel inverters with hexagonal voltage space vector structures have improved performance of induction motor drives compared to that of the two level inverters. Further reduction in the torque ripple on the motor shaft is possible by using multilevel dodecagonal (12-sided polygon) voltage space vector structures. The advantages of dodecagonal voltage space vector based PWM techniques are the complete...
This paper considers a new system structure, which does not require current sensors for control and is optimized for medium- and small-power drives with strict requirements on precision. The main difference between traditional vector control and the proposed structure is a direct axis current compensator (DACC). DACC simplifies the control algorithms and cheapens the control hardware, in particular,...
This paper proposes a new five-level voltage source converter (VSC) for medium-voltage high-power applications. The features and operation of the proposed converter is studied. The Space Vector Modulation (SVM) technique is developed to regulate voltages of flying capacitors. The performance of the proposed converter is evaluated by simulation and experimental results.
This paper presents three-phase four-level FLC based electric motor drive for mining application supplied directly from a 6 kV ac-grid. It describes complete control algorithms of the drive with active voltage balancing control. The proposed control is verified by experiments carried out on down-scale drive prototype of rated power of 35 kVA.
In this paper, the basic principle of space-voltage vector PWM (SVPWM) is presented. Due to back propagation neural networks (BP) based SVPWM controller have local optimization problem and lower training rate, a radial basis function neural networks (RBF) controller based SVPWM is proposed. Using Matlab/Simulink together with Neural Network Toolbox, we develop a computer simulation program for the...
The transformerless DC/AC inverter topologies are employed in Photovoltaic systems in order to improve the power conversion efficiency, power density and cost. The Active-Neutral Point Clamped (Active-NPC) transformerless inverters have the advantage of achieving better thermal balance among their power semiconductors. In this paper, a new modulation technique is proposed for optimally controlling...
In this paper, a performance comparison of Voltage Source Inverter (VSI) controlled by Model Predictive Current Control (MPC) and closed loop Sine Pulse Width Modulation (SPWM) is presented. Basic concepts, operating principles, control diagrams and results are used to provide a comparison between the SPWM and MPC. Both methods are compared using simulations, results and the graphs are drawn. The...
The stator flux and electromagnetic torque are directly controlled in a DTC system using space vector modulation technique. In DTC, torque and flux ripples increases at low speeds. A DTC-SVM induction motor drive at very low speeds is investigated here and High Frequency Signal Injection (HFSI) method is adopted to mitigate the low speed issues. In this method a sinusoidal wave of small amplitude...
Power quality is acquiring increased attention in the present power system environment. Increased use of sensitive and nonlinear loads in electrical power systems and the rapid growth of renewable energy sources are the major causes of poor power quality. The most regular power quality situations are voltage dip, voltage swell, harmonic contents and so on. Among these, voltage sag is considered as...
Aiming at the power component open circuit faults of the cascaded inverter, the fault model is set up, and the PSO-BP neural network is used to diagnose the faults. At the same time, in order to avoid the premature convergence in the basic PSO algorithm, some mutation operations are conducted upon the particles. The wavelet decomposition is used to extract the fault characteristics for training and...
Permanent Magnet Synchronous Motors (PMSM) are good option for electric vehicles, hybrid electric vehicles and used for many industrial, aerospace and domestic applications. This paper presents hardware implementation of PMSM drive system without using any position sensor. An open loop control is implemented to operate PMSM at various speeds. Discussed basic theory of space vector PWM for generating...
This paper investigates the four different Pulse Width Modulation strategies and thoroughly analyses and evaluates the performance of VSI based inverter implementing the different modulation techniques. It is demonstrated by theoretical analysis and simulated results using MATLAB Simulink Tool. The inverter output voltage, total harmonic distortion of voltage output and common mode voltage in each...
Space vector based pulse density modulation scheme is a control method proposed for multilevel inverter producing octadecogonal space vector. A multilevel inverter is constructed by connecting two level inverter at right end and three level inverter at left end of a three phase transformer winding whose secondary is star connected. This inverter is fed with three different DC voltages possible of...
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.