Journal
SYMMETRY-BASEL
Volume 14, Issue 3, Pages -Publisher
MDPI
DOI: 10.3390/sym14030483
Keywords
reactive power; compensator; renewable energy; cascaded inverter; low-voltage grid; asymmetric compensation; smooth compensation
Categories
Funding
- EEA Grants
- Research Council of Lithuania (LMTLT) [S-BMT-21-5 (LT08-2-LMT-K-01-040)]
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This paper proposes and analyzes the topology of a static synchronous compensator of reactive power for a low-voltage three-phase utility grid capable of asymmetric reactive power compensation, with lower power losses compared to conventional compensators.
The topology of the static synchronous compensator of reactive power for a low-voltage three-phase utility grid capable of asymmetric reactive power compensation in grid phases has been proposed and analysed. It is implemented using separate, independent cascaded H-bridge multilevel inverters for each phase. Every inverter includes two H-bridge cascades. The first cascade operating at grid frequency is implemented using thyristors, and the second one-operating at high frequency is based on the high-speed MOSFET transistors. The investigation shows that the proposed compensator is able to compensate the reactive power in a low-voltage three-phase grid when phases are loaded by highly asymmetrical reactive loads and provides up to three times lower power losses in the compensator as compared with the situation when the compensator is based on the conventional three-level inverters implemented using IGBT transistors.
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