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This paper proposes an adaptive observer based on Kalman filter (KF) to estimate the capacitor voltages of Modular Multilevel Converters (MMC). The proposed method offers a considerable reduction in sensors count, hence the system cost and also increases the converter reliability. The paper also investigates several approaches linked to MMC; voltage balancing control issue, the effect of circulating...
Nowadays the increasing utilization of renewable energy sources demand power converters capable of delivering high quality energy to the low voltage grid. The traditional dead-time compensation methods handle high-power operating conditions well, but low-power conditions and discontinuous conduction require further investigation. This paper identifies four cases of discontinuous conduction in single...
In this paper, switching modulation schemes for Z-source converters used for renewable energy integration are investigated. Both dc-dc converters and dc-ac converters are discussed. Input/output voltage relationships for the two types of converters (half-bridge dc-dc and three-phase three-bridge dc-ac) are analyzed based on circuit analysis. The two converters are built and simulated in PSCAD. Simulation...
An inverter is a circuit which converts dc power into ac power at desired output voltage and frequency. The a.c. output voltage can be fixed at a fixed or variable frequency. This conversion can be achieved by controlled turn ON & turn OFF or by forced commutated thyristors depending on applications. The output voltage waveform of a practical inverter is non sinusoidal but for high power applications...
In this paper, a multi output high frequency soft switching inverter topology is presented for home use IH cooking appliances. The proposed inverter system is comprised of simple power circuitry and unique control scheme. The detailed analysis shows that the proposed inverter has low harmonic distortion, low switching losses and wide output power range. A detailed PWM procedure is illustrated as well...
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