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This paper presents a novel voltage-shift acceleration control scheme for anti-islanding of power-converter-based distributed generators (DGs). The proposed control objective is achieved by a voltage positive-feedback loop properly designed in the synchronous d-q frame. In this paper, the overall power flow control scheme of the studied DG is first described. Then, a quantitative design methodology...
Desired islanding detection method not only can detect islanding within acceptable duration, but also require it has less adverse impact on power quality. This paper presents an active islanding detection method for a distributed resource (DG) unit which is coupled to a utility grid through grid-connected converter. With the proposed method which is based on adding periodical disturbing current through...
As the development of distributed generation technology, the renewable energy resources are widely transformed to electricity and transferred to the utility through grid-connected converters. Islanding detection is a mandatory function for the converters. It usually injects perturbations to the converter output to improve the effectiveness of islanding detection. The current research is mainly based...
With the capacity of operating in four quarters and low total harmonic distortion in the grid side, back-to-back converter became a hot spot these years. In this paper, a novel topology structure of back-to-back three-level converter was proposed, it's principle was analysed, besides, the controlling method was stated in detail. Finally, the control method was verified by simulation.
Three level dual Buck half bridge inverter topologies, especially the coupled-inductance dual Buck inverter, are presented. Dual Buck inverter is a new configuration which has the characteristics of high frequency and efficiency. However the output of the bridge is in bi-polarity PWM waveform and the voltage stress is high. To overcome those problems, three level combined switches are adopted to replace...
To meet the requirement of the output power of grid-connected photovoltaic (PV) power generation system, the inverter should be controlled according to the output power of PV arrays. In this paper proposed method of a novel fuzzy logic control for grid connected photovolatic system. The system composed of boost converter and a single-phase full-bridge inverter connected to utility grid. The system...
This paper compares voltage gain of control methods for the Z-source inverter under a given boost factor. The control methods of the Z-source inverter are simple boost control, maximum boost control and maximum constant boost control respectively. The Z-source inverter advantageously utilizes the shoot-through switching states besides active and zero states. The Z-source network makes the shoot-through...
The paper deals with the automatic generation of global model of static converters without the description of their environment. The considered models are average and exact models (i.e. with ideal switches). These models are obtained by using a software tool named AMG (for Average Model Generator) with a priori on the control mode and behaviour of the static converter. In this paper, an extension...
This paper evaluates the features of a new highly modular multilevel converter topology (M2C) for medium voltage applications. Furthermore this paper will compare the M2C converter topology with existing converter topologies regarding the basic principle of operation, measurements as well as the harmonic content of the electrical output values.
The paper presents a comparative study of three different 3D-SVM techniques for the control of flying-capacitor multi-level inverters under both balanced and unbalanced operating conditions. Simulation results show that Direct 3D-SVM is the most efficient in computational effort. Application of this scheme to a three-level FCMI is simulated using the Alternative Transients Program (ATP). Output performance...
At the design framework, in this Thesis s the modular multilevel converter (MMC) is analysed and proposed for connecting the power grids. In order to mathematically describe the converter behaviour, the linear time-varying model (LTV) is developed. The system is considered linear between two switching instants. Since the switching functions have a periodical nature, the steady state of the system...
F3E (fundamental frequency front end) is the denomination for a converter with active rectifier and negligibly small DC-link-capacitance. These converters are normally used to operate 3-phase-motors, especially in applications where power regeneration is required. The simplicity and high efficiency of F3E-converters makes them suitable also for renewable energy applications (wind, water etc.), or...
A simple method of serial connecting IGBT's is applied and standard low voltage IGBT modules are used in the MV test inverter to evaluate the method. The dc link voltage is 2.4 kV and the RMS output line to line voltage is 1.7 kV. The method works and test experiences are presented in paper.
Modern railway traction converters are equipped with IGBT-modules. Due to the mode of operation and a service lifetime of 30 years, typically specified for traction applications, the cycling capability is an important issue in converter design. The requirements from the application are summarized and design targets for the next generation of IGBT modules are discussed in this paper.
The paper reports the results of analysis of a multi-terminal UPFC used for power transfer and stability improvement of power systems. The analysis employed abc to qd0 transformation technique to obtain a time-invariant equation describing the system. A simulation of a-two transmission network rated at 20 and 15 MVA at 33 kV was investigated. Results confirm that converters rated appropriately can...
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