A COMBINED ULTRA CAPACITOR AND DYNAMIC VOLTAGE RESTORER FOR MITIGATING VOLTAGE SAG AND SWELL IN POWER QUALITY OF THE DISTRIBUTION GRID
Journal Title: International Journal of Engineering Sciences & Research Technology - Year 0, Vol 5, Issue 1
Abstract
The most severe power quality problems in electrical systems are called as voltage sag and swell. These power quality problems must be compensated accurately. There are two voltage injection strategies to inject controlled voltage via dynamic voltage restorer (DVR) in electrical systems. The proposed power conditioner has active power capability which is useful in mitigating the grid intermittencies and in improving the voltage sag and swell compensation. Here, energy storage is integrated into dc-link of the power conditioner through a bidirectional dc-dc converter that helps in providing a stiff dc-link voltage. The integration helps in providing active/reactive power support, intermittency smoothing, sag/swell compensation and harmonic compensation. The power conditioner operates in five different modes, each of which has been analyzed. The novel contribution of this paper lies in the integration of rechargeable UCAP-based energy storage into the DVR topology. With this integration, the UCAP-DVR system will have active power capability and will be able to independently compensate temporary voltage sags and swells without relying on the grid to compensate for faults on the grid like in the past. UCAP is integrated into dc-link of the DVR through a bidirectional dc–dc converter, which helps in providing a stiff dc-link voltage, and the integrated UCAP-DVR system helps in compensating temporary voltage sags and voltage swells, which last from 3 s to 1 min. Complexities involved in the design and control of both the dc–ac inverter and the dc–dc converter are discussed. The simulation model of the overall system is developed and compared to the experimental hardware setup.
Authors and Affiliations
K. C. Anandhan
Keywords
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