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This paper proposes a current compensation method for current reconstruction from a DC-link current sensor. The method has region in which phase current reconstruction is difficult. To solve this problem, voltage reference and carrier compensation methods have been proposed. However, these methods increase the phase current harmonics. This paper proposes a current compensation method that uses the...
This paper focuses on the circuit which is to reduce the number of switching elements in comparison to a common multi-level inverter NPC inverter. Increasing the number of levels of the output voltage at reduced circuit number switching elements, and performs waveform improvement. Typically, the ratio of the input voltage of the multi-level inverter is E1 : E2 = 1 : 1. When the ratio of the input...
An energy storage system is integrated into a power-grid to compensate for the power fluctuation from renewable energy systems. This paper proposes a high-efficiency and low-cost energy storage system for the power-grid. The proposed system combines multi-energy storage devices such as a LaB and an EDLC for reducing the cost incurred by the system for the complete operation period. This paper also...
Uninterruptible power supplies (UPSs) are widely used to overcome instantaneous voltage drops and complete power failures. This paper proposes a novel single-phase standby UPS with a small size and high reliability. The proposed UPS consists of a buck-boost converter and a full-bridge inverter; this device eliminates the need for bulky electrolytic capacitors or output LC-filtering. The buck-boost...
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