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Under unbalanced grid conditions low order harmonic appears both at the DC output and AC inputs of the converter. Such harmonics lead to deterioration of performance of the system. This paper presents a novel feedback-based controller, which regulates directly converter voltages to eliminate of the 2nd ripple of DC link voltage to alleviate the stress of DC-link capacitor and to reduce the 3rd harmonic...
The Interline Power Flow Controller (IPFC) is a voltage-source-converter (VSC)-based flexible ac transmission system (FACTS) controller for series compensation in a multiline transmission system of a substation. The common DC link in the IPFC configuration enables each inverter to transfer real power to another, so regulation of DC link voltage is an important issue in overall performance of the system...
This paper presents a novel selective control algorithm for a shunt active filter. Based on the proposed control algorithm, the active filter drains controlled currents in order to improve the performance of the passive filters and also to minimize a specific harmonic component of the system voltages. The controlled currents produced by the active filter are determined through the system voltages,...
Recently, importance of the effective use of energy and demand for the introduction of renewable energy have risen more than before. Therefore, it is necessary to construct power network systems that consist of semiconductor power converters with various functions such as generation of the electric power, storing and discharge of the electric power. This paper describes high-speed coordination control...
Voltage sags are major power quality problems in distribution systems. To overcome these problems, different solutions have been proposed to compensate these sags and protect sensitive loads. As a solution, dynamic voltage restorers (DVRs) have been proposed to provide higher power quality. However, the quality of DVR output voltage, such as THD, is important. So, in this paper a configuration of...
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