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Power Quality (PQ) is the most significant perspectives at transmission and distribution levels. The supply of high grade electrical services required to the customers illustrates this concept. The voltage sag and swell are the most frequent PQ problems that mainly occur in the distribution systems since it may cause equipment tripping, failure of drive systems, shutdown for domestic and industrial...
This paper presents Dynamic Voltage Restorer (DVR) based on bidirectiona l full-bridge dc-dc converter to compensate severe voltage sag/swell problems in medium voltage system. Voltage swell causes the continuous rise at dc-link voltage of DVR which may damage the dc-link capacitors and solid-state devices, and increase the power losses. Unidirectional dc-dc converters based DVRs do not allow power...
The global trend towards larger size ground mounted photovoltaic (PV) power plants seems set to continue, with the development of several projects in the 100MW range and higher. This installation trend will challenge the existent PV plant architectures by requiring power converters with a higher power rating and a higher voltage level at the point of common coupling (PCC), which can lead to higher...
In this paper, a new scheme for the multilevel inverter based dynamic voltage restorer (DVR) is proposed. The proposed DVR uses multilevel inverter and a dc/dc converter. The dc/dc converter adjusts the dc link voltage according to the amount of voltage sag so that the output voltage of the multilevel inverter has always its maximum possible number of levels. This results in the better quality of...
The dual-active-bridge (DAB) and a half-bridge inverter are integrated back-to-back for a converter/inverter system. The power source is isolated by a high frequency transformer, and a 60 Hz inverter is directly connected to the secondary side of the converter via DC link capacitors. Thus, the proposed converter-inverter topology greatly reduces the size and the number of parts count, while providing...
Distributed power generation will be formed in many weak distribution networks, after renewable energy sources are connected to them. It is very important to increase the reliability and efficiency of using these renewable energy sources. By using DVR (dynamic voltage restorer), the power quality problem in distributed power generation (e.g. voltage fluctuation) can effectively be solved. In this...
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