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Normally, photovoltaic (PV) power system can be considered as a disturbance of power system. But in proposed paper that when power fluctuation occurs, high permeability PV system can suppress power grids low frequency oscillation because of its large capacity and quick response. If high penetration PV system has the ability of power system energy balance, it is sure to get more extensive applications...
The loosely coupled transformer is the key component of a contactless power transmission (CPT) system. In order to reduce the size of the loosely coupled transformer, mixed winding arrangement containing planar winding and vertical winding is proposed in this paper. However, because of the using of the vertical winding, the proposed transformer has a large part of leakage flux at the back of the core,...
This paper carefully discusses the interaction between the bus capacitors and the parasitic inductances in an integrated DC-DC converter module. The design principles of the bus capacitors are presented and validated by simulation results. In addition, an optimized PCB layout with split bus capacitors is proposed for enhancement-mode Gallium-Nitride (eGaN) transistors based integrated DC-DC power...
Leakage current suppression for a transformerless zero voltage switching (ZVS) full-bridge inverter is investigated. The leakage current model and the common mode voltage of the ZVS full-bridge inverter are analyzed. The leakage current flowing through the parasitic capacitor between PV panels and the ground is reduced by a common mode inductor and the bypass capacitors. The theoretical analysis of...
Islanding Detection is considered one necessary functionality for grid-connected photovoltaic (PV) inverters according to standards and grid-code limits. Diverse islanding detection methods, passive and active, have been proposed in literature to cope with this safety requirement. Among them, active methods are used to reduce and eliminate the nondetection zone (NDZ) when power is almost balanced...
A common DC bus connected PV-battery system is introduced, in which two asymmetry PV boost converters can work respectively or together, the T-type three-level DC/AC converter could operate in four-quadrant, the battery exchange power with the common DC bus via a bi-directional DC/DC converter (BDC), and some more peripheral equipments are introduced to make up the whole system. The overall control...
Wireless power transmission via magnetic resonance has been attracted and interested as long range wireless power transmission method. As a consequence, high-frequency inverter operating under high power conversion efficiency is required. In this paper, power conversion efficiency and power transmission efficiency of full bridge inverter using GaN devices are evaluated and discussed from the experimental...
Nowadays, electromagnetic interference (EMI) seems to be one of the major constraints of photovoltaic inverters. Unfortunately, it is too often regarded as the last phase of the development of the system since it represents the last step of its marketing. This paper discusses DC side EMI filter design methodology for photovoltaic inverter System. An analysis of noise source and propagation path impedances...
An improved grid-connected photovoltaic (PV) power generation system is proposed to solve the problem that the total harmonic distortion (THD) of grid-connected current generally exceeds 5% under the condition of low output power of PV array in this paper. The system includes a larger capacity master inverter with an LCL filter and a smaller capacity slave inverter with an L filter. Two inverters...
Continuing to raise the bar for power conversion performance, eGaN FETs are steadily improving performance in high power density and high current applications. In this paper we will discuss the latest developments in DC-DC converters, including a major improvement in eGaN FETs with the latest generation devices. This new family of eGaN FETs is keeping Moore's Law alive with significant gains in key...
Controllability of the nine-switch inverter is studied with the switched linear system model. On the basis of analysis results, a novel space vector pulse modulation (SVPWM) strategy is proposed. Compared with the classic SVPWM strategy, the number of operation modes used in the novel modulation strategy is reduced by half, therefore the switching sequence of the vectors can be simplified. In addition,...
The resonance characteristics of ultrasonic transducer are analyzed based on the equivalent circuit of transducer and the quantitative calculation of admittance circle, and a control method of frequency tracking based on variable step length is proposed, and the limits of step switching are deduced, and the control parameters of the control method based on variable step length is designed in this...
Multi-Functional Bidirectional AC/DC T-type 3-Level Converter for Super UPS is investigated in this paper. The AC/DC converter is used as the interfaced between DC Bus and Energy Source or Load. According to the components (grid, gas turbines, AC loads) connected in AC side, The AC/DC converter operates at AC voltage source mode, Power source mode or DC voltage source mode. A control scheme for the...
This paper proposes an improved power sharing control scheme to achieve the accurate power sharing control and offer an improved PCC voltage regulation capability in islanding microgrid. An enhanced virtual impedance design is assumed in the conventional droop control scheme to manage distributed generation (DG) units to export the accurate reactive power in proportion to their rating. A point of...
In order to meet the requirements of electrolytic copper-foil, a 6.5V/50kA power supply system composed of ten power modules is developed. The power module is composed of two-leg PWM rectifier and dc/dc converter, and dc/dc converter adopts two full-wave rectifiers in parallel to enhance the output ability. In order to meet the process requirements of electrolytic copper-foil, a virtual impedance...
The work presented in this paper aims to propose a control strategy being able to extract efficiently energy from a fixed-pitch marine current turbine associated with a 5-phase Permanent Magnet Synchronous Generator (PMSG) in healthy mode and in faulty mode. The considered faults are opened phases. For each tidal current speed, the control strategy aims to extract the maximum power with respect of...
In AC/DC hybrid grid, the individual AC and DC grids exist. The power converters are the key interfaces between these two kinds of individual grids. Under unbalance AC grid, the grid voltage is distorted and the harmonics is involved. Therefore, the active power and reactive power also give rise to the uncontrolled oscillations, which will damage the interface converters. In order to ensure the safety...
Owning to the predictability of tidal current resources, marine tidal current energy is considered to be a reliable and promising renewable power source for coastal areas or some remote islands. During the last 10 years, various original horizontal axis and vertical axis marine current turbines (MCT) have been developed around the world. Although various projects have been reported in the state-of-the-art...
This paper proposes a novel resonance suppression scheme for a single-phase grid inverter with the LLCL filters. In the structure of the LLCL filters, a small inductor is connected in series with the capacitor in the conventional LCL filters to make zero impedance at the switching frequency, by which the grid-side inductor filter can be reduced remarkably. However, since the resonance phenomenon is...
This paper discusses low speed double stator permanent magnet generator design combined with control strategies. The study is based on analytical model. The results indicate that generator structure design is a compromise between torque volume density, power efficiency and control strategy. The reactance value presents an important factor for the system power efficiency and selection of control strategy...
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