A5042844597- Advanced DC-DC Converters
- Multilevel Inverters and Converters
- Microgrid Control and Optimization
- Silicon Carbide Semiconductor Technologies
- Real-time simulation and control systems
- Radiation Effects in Electronics
- Modeling and Simulation Systems
- HVDC Systems and Fault Protection
- Power System Optimization and Stability
- Power Quality and Harmonics
- Induction Heating and Inverter Technology
Budapest University of Technology and Economics
2013-2024
As switching power converters are becoming widespread, the quality of inverters and active rectifiers is increasingly important. Effective dead time a major cause harmonics in output current voltage sourced PWM converters. The traditional dead-time compensation methods can only handle high operating conditions well. Several capable accurately compensating at low zero crossing or discontinuous currents require actual value ripple which measured between two switch-over points within period. In...
Nowadays the increasing utilization of alternative energy sources demand three phase power converters capable delivering high quality to low voltage grid. Good dead time compensation hardware and software are essential keep order harmonics at acceptable levels even light load conditions, costs. Low current waveforms with multiple zero crossings within a switching period still problematic today's technology. Such operating conditions often happen in PWM inverters variable frequency drives or...
Nowadays the increasing utilization of renewable energy sources demand power converters capable delivering high quality to low voltage grid. The traditional dead-time compensation methods handle high-power operating conditions well, but low-power and discontinuous conduction require further investigation. This paper identifies four cases in single phase half bridge inverters, describes resulting nonlinearities. Based on these results three continuous conduction, an improved dead time method...
The 60° flat-top modulation technique (also called two phase or discontinuous modulation) is a widely used method in the industry to reduce switching losses three PWM inverters. This reduces number of switchings via adding zero sequence component output voltage. added chosen such that one legs not switched, but phase-to-phase voltage still remains sinusoidal. In this article it shown can cause low order harmonic distortion. and magnitude effect investigated, an empirical given decrease...
Back-to-back PWM inverter based bidirectional dynamic voltage restorers (DVR) may have worse efficiency than mechanical or SCR solutions, but they are able to provide a continuously variable in series with the grid. As injected waveform does not need be sinusoidal, additional features also implemented software. In this paper it is shown that compensation of harmonics, flicker, and even transients all possible some extent. The power required for injection originate from same phase where...
Nowadays, the need for isolated bidirectional DC-to-DC converters is increasing, as electric energy storage gaining more popularity. For high power applications, Dual Active Bridge (DAB) are widely used. Various control methods were proposed throughout years, but none of them practical to use with low frequency and leakage transformers. In this paper, a novel algorithm presented, which specifically designed these applications has outstanding transient response characteristics. The behavior...
The 60° Flat-Top PWM modulation method (also called DPWM1, two-phase, or bus-clamp) is widely used by the industry to reduce switching losses in three-phase inverters connecting one of legs positive negative DC rail continuously for 60°of fundamental period. It known that - compared most SVM increases frequency current components. actual amount highly dependent on index. a lesser fact at each switch-over happening every 60°, because change phase component low-order harmonics are produced as...