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For reduction of the switching power losses developer of three-phase inverters thinks increasingly about discontinuous modulation strategies. This applies in particular for high power inverters such as for starter generator - or hybrid drive systems. The dc-link current of these discontinuous modulated voltage source inverter are analyzed in this paper. First the dc- and the rms-current of the dc-link...
The European navigation satellite system Galileo is moving ahead. We describe the open service signal L1 OS transmitted from the satellites. Compared to GPS some new features are introduced: Binary offset carrier modulation, coherent adaptive sub-carrier modulation, pilot signals, and tiered codes. These features make the GPS and Galileo signals live together on the same frequencies, and they make...
Nowadays the most used multilevel topology for variable-speed wind turbines (WTs) is the a back-to back three-level NPC (Neutral Point Clamped) VSCs (voltage source converter). One of the most critical elements in the design of this type of converters is the DC-bus capacitors. The calculus of these depends on the same factors that the same two-levels topology, and, moreover it is function of a low...
A micro-controller-based dimmable electronic ballast for HPS lamps is presented in this paper. An easier and low-cost power control method is proposed in this paper, based on the regulation of the average input current of the inverter. Driving signal with low frequency modulation generated from MCU is used to eliminate unstable arc during dimming state. Experimental results for the commercial HPS...
Multilevel inverters have become an attractive alternative for medium voltage and power quality demanding applications. However, like most power converter families, multilevel inverters are controlled with modulation techniques that are conceptually based on nonlinear waveform synthesis assuming constant dc-link voltages. Nevertheless, real applications have load and supply dependent dc-links that...
This paper presents an experimental chopper-inverter system which we use for most of our lab work in power electronics. The system is based on an IGBT three-phase voltage inverter and a FPGA control board. According to the configuration chosen by the user, this set can constitute a converter in a predefined list ranging from the simple non reversible buck converter up to the three-phase PWM power...
Based on small-signal models, comparisons were made for three commonly-used control schemes for adaptive voltage position for VRM applications. Performances compared include output impedance, control stability, and audio susceptibility. "AVP+" control compares favorably among the three schemes.
Operation of adjustable-frequency drives is accompanied by generation of losses in the converter and motor. These losses depend on the modulation frequency and on the drive output power. The change of modulation frequency modifies converter losses and also motor losses, because of the modified motor current waveform. Thus, it modifies total drive losses. Variation of the drive output power also modifies...
Novel method of synchronous pulsewidth modulation (PWM) has been disseminated for control of cascaded neutral-point-clamped inverters feeding open-end winding induction motor drive with single dc voltage source. Control algorithms provide in this case full elimination of the common-mode voltages both in each inverter and in the load. Phase voltages of the drive system are characterised by quarter-wave...
This paper presents a grasping/manipulating control method using mode transformation. Discrete Fourier transform (DFT) matrices are utilized as transformation matrices. In grasping/manipulating control systems, decomposition into grasping motion and manipulating motion remains a key problem. By means of the proposed method, the grasping controller and the manipulating controller can be designed independently...
This paper is shows technique of improvement signal output of inverter for driving high efficient achieve of improvement is designed by pulse width modulation which is delta modulation in order to use simply method and is not difficult, However, this method achieves high efficient output signal that dives slightly lower percent of harmonic. There more, Signal of output produces obtained heavy sinusoidal...
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