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.
High order harmonic flux and current of permanent magnet synchronous motor (PMSM) are generated by the distortion of air-gap magnetic field and the nonlinear characteristics of inverter, resulting in the ripple of electromagnetic torque. In this paper, a novel harmonic compensation algorithm was proposed to solve this problem. Based on the harmonic model of the PMSM, harmonic voltage is injected to...
The optimal design of a VSI based photovoltaic (PV) inverter has been studied extensively during the last years. The focus in these studies has been in the selection of the reactive components of the LCL-filter, leaving the inductor design out from the discussion. However, the inductor design plays important role when the design target is to minimize the size and the cost of the filter. Unfortunately,...
This paper presents three-phase current source inverter with hysteresis control in voltage source mode. Analysis of the output characteristics of the converter was made. The voltage source mode for current source inverter was considered. A computer model of three-phase current source inverter and control system with hysteresis control was developed. The basic diagrams illustrating working capacity...
This paper presents the mathematical deduction of models for LCL filters with and without the damping resistor, the criteria for designing LCL filter, a systematic procedure for designing LCL filter and experimental tests with an isolated load. Experimental tests demonstrate the relevance of propose procedure for the design of LCL filter. Usually, power inverter is the interface between renewable...
In this paper, a photovoltaic (PV) gird-connected micro-inverter controlled by power factor correction (PFC) controller is implemented. The PFC controller is adopted to control the inverter output current sinusoidally. Besides, the maximum power point tracking control circuit can get the maximum power form PV modules. The duality between the PFC circuit and the inverter circuit is presented first...
Due to the increase in load and use of heavy machines in the industries, the demand for multilevel inverter has been increased to a large extent. This paper investigates the effect of increase in Levels from 3 to 33 levels, using a simplified technique in Separate Source Cascaded Multilevel Inverter (CMlI) on the Total Harmonic Distortion (THD) for 1-Phase and 3-Phase Inverter without using any filters,...
Photovoltaic system (PV) is widely used in various renewable energy application. The main problem of PV system is how to get the maximum output power. Furthermore, the redundancy output power generated by on a distribution system should also be considered. This study utilizes the excess power for energy storage using bidirectional converter. Since the DC voltage which generated by PV and the energy...
The increasing presence of green energy on grid needs using of high control strategy and good power quality. For that reason this paper presents analysis and control of three phase space vector pulse width modulated (SVPWM) two level voltage source inverters (VSI) with constant switching frequency using a direct power control (DPC). In order to improve the power quality by reducing harmonic distortion,...
We present in this work the study and the realization of a photovoltaic system connected to the network. This system was simulated in the Matlab/Simulink environment and a laboratory prototype was manufactured for various tests and measures. Results of MPPT control, PWM control of a DC/AC single-phase converter, signal filtering of harmonic of the inverter as well as synchronization with the network...
Unique pitfalls in parallel three-level T-type inverters (3LTIs) are potential zero-sequence circulating currents (ZSCCs) which are more complex than parallel two-level inverters and can cause current discrepancy, current waveform distortion, power losses, etc. In this paper, the ZSCC paths in the parallel 3LTIs are first presented, and an equivalent model of the ZSCCs is developed. It is...
Aircraft technology has been witnessing a complete revamp in the past two decades. The traditional mechanical, pneumatic and hydraulic systems in civil aircrafts are beginning to be replaced by lighter and compact electrical systems. Inverters are indispensable in an aircraft electric system and are employed for conversion of DC power to AC. Multilevel inverters reduces the harmonic content in the...
This paper addresses the harmonic compensation error problem existing with parallel connected inverter in the same grid interface conditions by means of impedance-based analysis and modeling. Unlike the single grid connected inverter, it is found that multiple parallel connected inverters and grid impedance can make influence to each other if they each have a harmonic compensation function. The analysis...
Grid-connected photovoltaic (PV) systems with power electronic interfaces are becoming popular since they do not contribute to environmental pollution. However, one of the issues with grid feeding inverter is the requirement of high dc-link voltage. In view of this, single stage solar inverters using conventional inverters may not be suitable, since they require input dc voltage higher than the peak...
In this paper, based on the basic feature and its engineering calculation method of photovoltaic power, the mathematical model of PV power was established. The voltage oriented control (VOC) was applied in connecting to the power grid. In the context of PSCAD/EMTDC, a PV grid-connected system model was constructed and simulation research was conducted. The results demonstrated the main harmonic source...
This paper focus on the control of the module capacitor voltages and the circulating current harmonics of the modular multilevel inverter (MMI). The harmonic elements of the circulating current and the capacitor voltages are analyzed with a single phase state equations of the system deduced in this paper. And then the three phase state equations are transformed into the double line-frequency negative-sequence...
In order to improve the power quality of output voltage, a feed-forward control approach based on neural network observers for a single-phase inverter is proposed. This approach is to build a Hopfield Neural Network parallel observer based on the principle of energy minimization and to extract harmonic current from single-phase inverter output through optimized computation with Hopfield Neural Network...
The purpose of this paper is to analyze the harmonic current distortion in a system with air conditioners driven by frequency converters and its correction waveform current with the use of two filters tuned in different frequencies. The use of air conditioners inverter, despite lower power consumption, the circuit injects harmonic frequencies of multiple orders that pollute the system. The filters...
The core issues with Distributed Generation (DG) systems of today are the insertion of power quality threats, harmonic distortions to the main stream power system and inefficient power sharing leading to power fluctuation problem. This paper effectively sorts out the causes of power fluctuation in islanded mode of operation of micro-grids and presents an effective method for their optimum compensation...
Nowadays trains offer a level of comfort and services that obviously imply a higher energy consumption to feed the auxiliary train power systems. Usually, the auxiliary power systems are fed by two power converters placed in opposite ends of the train. These power converters share the demanded power and depending on how over-dimensioned the system is, they offer a certain level of redundancy. The...
This paper presents a study of a generalized multilevel asymmetric inverter based on a H-Bridge Cell with one Arm Series (CHB-as) and five switches. It is shown several asymmetrical arrangements of input source combinations that produce several equally spaced voltage levels with few components. Equations for determining the switching frequency employed in the low power processing cells are developed,...
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.