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Deficiencies like unbalanced voltages or harmonics in the voltage source could result in problems like excessive losses, over-voltages, mechanical oscillations, and interference with control electronics. Detecting these abnormal conditions in the machine is of great importance in the interaction of the electrical machine and the power grid. In this paper the effect of the unbalanced voltages, harmonics...
The grid-connected photovoltaic (PV) power generation system is expected to be more widespread in distribution systems due to increasing fossil-fuel cost. This paper presents a control system that combines photovoltaic (PV) grid connected generation and power quality managements with two system configurations. The system can not only realize photovoltaic generation, but also suppress current harmonics...
This paper presents a new single phase ac-ac converter. After a brief discussion about species of Z-source converters, dynamic model of converter is analyzed. This converter can step up and down input ac voltage. Simplicity and high power quality operation are its specific advantages. Proposed converter is designed based on main core of Z-source converters. Finally, this converter is simulated in...
This paper presents the design and implementation of a three-phase unity power factor single-stage rectifier. The main use of the converter is expected to be in the telecommunications industry where it supplies constant DC voltage to the telecom network and charges the high capacity batteries while providing unity power factor to the utility. The converter is based on the flyback topology operating...
In this paper Z-source ac-ac converter has been analyzed for compensation of voltage sags and swells and maintenance of continuous regulation in output voltage. A brief discussion about voltage sags and swells is done, and then Z-source ac-ac converter topology, control and operation are reviewed. Finally, simulation analysis has been done using Matlab/Simulink software and its results confirm theoretical...
One of the major power quality problems in distribution systems are voltage sags. This paper deals with a dynamic voltage restorer (DVR) as one of the different solutions to compensate these sags and protect sensitive loads. However, the quality of DVR output voltage, such as THD, is important. This paper present a new configuration of DVR based on flying capacitor multicell (FCM) converter. The main...
Quality of electrical energy is an important issue which has to be considered carefully. This paper examined the basic power quality problems and made a comparative study on the solutions of one of the most important power quality problem ??compensation of reactive power?? in Northern Cyprus. In this study conversional methods are used. For analyzing reactive power problems, Bozkaya Mine company power...
This paper presents statistical methods and wavelet based effective feature extraction method for power quality (PQ) disturbance classification problem. The PQ signals used in this study are two common types named as swell and sag. First, the signals consisting of sag and swell are determined by using statistical methods. In the previous studies, validation of PQ disturbances for obtaining skewness...
Deficiencies like unbalanced voltages in the voltage source could result in problems like excessive losses, over-voltages, mechanical oscillations, and interference with control electronics. Detecting these abnormal conditions in the machine is of great importance in the interaction of the electrical machine and the power grid. In this paper the effect of the unbalanced voltages on the motor performance,...
In this paper a new hybrid active filter is proposed that combines harmonic filtering and neutral current compensation. The main difference between proposed topology and conventional structures consists of the connection of neutral wire to positive terminal of DC link capacitor thus avoiding the need of split capacitor or forth leg for neutral current cancellation that reduces the manufacturing cost...
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