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Nearest level modulation is one of the main modulation strategies in the modular multilevel converter (MMC), which has obvious advantage in the converter with a large number of voltage levels. To ensure the effect of voltage balancing, the capacitor voltages of submodules are usually required to be collected and sorted all the time, and a great deal of voltage acquisition modules are needed to achieve...
Ripple current at twice the output frequency exists at dc side in single phase inverter due to the instantaneous power imbalance between input and output power. Neutral-point voltage waveform control method is proposed in this paper to eliminate the ripple current in E-capless full-bridge inverter. With the proposed method, the pulsation power is controlled to only flow through ac capacitors and the...
This paper applies the solar photovoltaic power generation to supply the power to the insulator power line detection system. The paper control the charging and discharging of the battery through the DC / DC, voltage and current regulation feedback circuit. This system has finished the anti-lightning of protection of the battery, overcharge protection, charge overcharge protection and anti-reverse...
The mass resolution of the sensor based on a film bulk acoustic resonator (FBAR) needs to be improved when it is used to detect small molecules with low concentration. A method to improve the mass resolution of FBAR by active control technology is proposed. The active control function is realized by introducing an active control piezoelectric layer between the sensing piezoelectric layer and the substrate...
The paper proposes two automatic voltage controllers for the South Korean power system. Simulation results from detailed Korean power-flow models show that the controllers can provide significant improvements in security, quality and efficiency of power system voltage monitoring and control. Operating within a time scale ranging from tens of seconds to a few minutes, the controllers can act upon voltage...
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