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Grid connected photovoltaic inverters always adopt a cascade control system in interfacing photovoltaic cells for maximum power point tracking purposes. Unbalanced gird voltage generate a double frequency component in the dc-link voltage. Either selecting larger capacitance value or decreasing the crossover frequency of the dc-link voltage control decreases distortion of grid current references. Large...
The dead-time effect of driving signal and the lagging effect of digital control have serious implications for the static and dynamic performance of the inverter distortion voltage, the paper makes a research on static and dynamic performance of diode clamp three-level single phase inverter. The paper regards dead-time effect and lagging effect as a periodic disturbance and proposes a lagging improved...
This paper presents a simple design procedure for LC filters used in wide band gap device based adjustable speed drives. Wide band gap devices offer fast turn-on and turn-off times, thus producing high dV/dt into the motor terminals. The high dV/dt can be harmful for the motor windings and bearings and must therefore be reduced. This may be accomplished by a sine LC filter with DC link feedback, which...
A voltage source inverter-fed synchronous magnet synchronous motor (PMSM) produces torque ripple due to application of pulsewidth modulation (PWM) method. Torque ripple is influenced strongly by the PWM strategy. A Hybrid SVPWM (HSVPWM) technique is presented to reduce torque ripple of PMSM. The method employs both conventional sequences and advanced bus-clamping switching sequences, which apply an...
Harmonics generated from Large-scale Grid-connected photovoltaic plant (GCPV) has the characteristics of high frequency and wide range. So the impact of distributed parameter of high-voltage cables becomes more significant. Based on an actual GCPV, harmonic output particularities were discussed according to its operating mechanism. Step-up transformer, reactive power compensation device, distributed...
In this paper, a novel nine level bi-direction multilevel inverter is proposed, The structure of the main concepts for the use eleven power switch devices to divide input voltage that is replace the traditional circuit using by capacitor. Nine switches and four diodes are required to generate a nine-level output. Additional two switches and inductor will generate an output voltages balance circuit...
Power converters are crucial components of the wind turbine generator system (WTGS), and the reliability of wind power converters is partly susceptible to the wind speed at the wind sites. The existing literatures, which evaluate the effect of wind speed on lifetime of power semiconductors, mostly compare lifetime of power semiconductors in the different wind farm and hardly obtain relationship between...
Micro grid(MG) consists of a number of parallel operating inverters. The droop control strategy is commonly used in parallel-connected inverters. The conventional PI regulator for the voltage control has little effect on restraining the voltage harmonic content under the nonlinear load conditions. So an effective and reasonable control strategy for inverters must be adopted to ensure the output power...
A flux-controlled cubic memristor circuit is developed and a van der Pol oscillator is implemented based on the inherent non-linear properties of this memristor. Meanwhile a linear feedback controller is designed to synchronization of two chaotic circuit. The range of the controller gain for synchronizing is derived. Both results of simulations and experiments validate the proposed van der Pol oscillation...
A parallel-serial dual active bridge (PSDAB) circuit is presented in the paper to improve the efficiency under the circumstances of high-voltage ratio transformation. The proposed PSDAB circuit is constructed by the paralleled low-voltage terminals of the two dual active bridges (DABs) and the serial high-voltage terminals of the DABs. Just like the DAB circuit, the zero voltage switching (ZVS) is...
There are lots of issues existed with the Power Supply System in DC Building, and it is controversial as these issues have not been solved completely. In recent years, worldwide attention has been focused on proposing the standards of “HVDC power supply system” or “up to 400Vdc power feed system” following with the development of the power supply system in data center. Many attentions from the worldwide...
Based on the existing voltage balancing scheme for two series HV-IGBTs (High voltage insulated gate bipolar transistors) with active clamping and status feedback, this paper focuses on the characteristics of IGBT with active clamping circuit. First, the previous series IGBT model is improved according to the experiment results in order to give accurate feedback signal in the active clamping sub-circuit...
The development of an intelligent control solution for a wide range of diesel generators is discussed. Compared with most existing solutions, the advantages of the proposed solution lie in two folds: (i) The proposed control has the plug-and-play capability which is reflected by an automatic recognition procedure when it is plugged into a specific diesel generator, such that some extensive manual-tuning...
In view of the problem of traditional single-stage DC-DC converter transform difficult in the 380V DC micro-grid composed of distributed power, this paper proposes a novel topology, achieving high-step-down ratio and soft-switching. Based on the analysis of its basic principle, this paper gives the soft-switching conditions, and discusses the stability of the circuit in sliding mode variable structure...
As for high power plasma power supply, due to high efficiency and flexibility, multi-channel interleaved multi-stage paralleled Buck DC-DC Converter becomes the first choice. In the paper, two-channel interleaved two- stage paralleled Buck DC-DC Converter powered by three-phase AC power supply is selected as research subject, dedicated for the use of plasma cutting machine of 2×45kW, and the passivity-based...
A new current-fed rectifier based phase-shifted full-bridge (PSFB) converter is proposed in this paper to be suitable for the electrical vehicle application, where the load range is wide and high output voltage is required. The converter can achieve effectively zero-voltage switching (ZVS) for the leading arm and zero-voltage zero-current switching (ZVZCS) for the lagging arm in the whole load range...
In modern smart electric grids, power cables are supervised by a large number of monitor equipments. In many field application cases, current transformers (CT) are employed to extract electrical power from these high voltage cables to supply monitoring circuits. In this paper, in order to harvest maximum power from cables, key parameters of the rectifier with current transformer circuits are analyzed,...
This paper proposes a new interleaved flyback topology based on hysteretic control. The output current ripple can be reduced with the interleaved structure, and both switches can achieve Zero-voltage-switching (ZVS). Besides, the energy of leakage inductance can be fully recycled, which will improve the efficiency of the converter. The topology is based on hysteresis control, with this control scheme,...
This paper proposes a reactive current control method focusing on a copper loss reduction for a dual active bridge DC-DC converter. The proposed method controls the reactive current using the fundamental wave model of the primary and secondary voltages in the dual active bridge DC-DC converter. However, the total power factor reduced by the harmonic component of the output voltage of the each inverter...
In order to overcome the disadvantages in traditional “EE” shape coupled inductors that the distributions of the air gaps are too concentrated, the distributions of the magnetic pressure and flux are not uniform, the air gaps are too nearly to the windings, this paper proposes a new structure of coupled inductors. It is proved with simulation and experiment that in the new structure, a parallel connection...
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