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The stator transient DC flux component emerges in the Double Fed Induction Generator (DFIG) following grid voltage dip, which results in an important influence on the controllability of rotor converter. In this paper, the research focuses on the responding time of the dynamic reactive current injection referring to DFIG with the crowbar protection under Zero Voltage Ride-Through (ZVRT). Firstly, theoretical...
This paper proposes a novel control technique for the DSTATCOM. The DSTATCOM in this paper is connected to a distribution system with a DFIG based wind farm acting as a source. The DFIG here is considered to be operating in islanding mode. There are a large number of DSTATCOM controllers proposed. In this paper a novel optimised Icosf controller is proposed to reduce the THD level. The controller...
For medium/high voltage high-power neutral-point-clamped (NPC) three-level converters, narrow pulses appear usually when modulation waves are close to ±1 and 0. To ensure reliable switching and the safety, a long narrow pulse limit time needs to be set. Narrow pulse problems will become prominent. Meantime, neutral-point voltage balance problem of three-level NPC converters is a key issue that should...
Recent developments show that renewable energy sources are considerably contributing to the electrical power generation and offer a future-oriented, sustainable and environmental-friendly alternative to fossil energy sources. Wind energy in particular has experienced a rapid growth over the past decades, so that wind energy conversion systems (WECS) will occupy an important role in the power generation...
Diversified Technologies, Inc. (DTI) is building three long pulse solid-state klystron transmitters to meet spallation source requirements. Two of the three will be installed at CEA Saclay and the National Institute of Nuclear and Particle Physics (IN2P3) in 2015, to be used as test stands for the European Spallation Source (ESS), The third system will be installed at Oak Ridge National Laboratory...
The dynamic voltage restorers are efficient series compensation devices to improve power quality. Indeed, they are composed of a coupling transformer and power electronics to provide fast voltage sag correction and harmonics compensation. This paper focuses on a new topology of a coupling transformer for the dynamic voltage restorers which improves the protection of the voltage source converter against...
This paper presents a nonlinear control strategy for single-phase universal active filters, using multiple reference frames. The control uses the concept of product demodulations and feedback linearization to circumvent realization problems of standard park transformation strategies and resonant controllers. However, similar to those, the present control allows achieving selective compensation and...
The dynamic voltage restorer (DVR) is among the most cost-effective solution against voltage sags. By using the transformer coupled topology, DVR could take the advantage of electrical isolation and voltage boost. However, at the start of compensation, the injection transformer may experience a flux linkage that is up to twice its steady-state value. The flux linkage will be driven to the level of...
To improve the voltage quality of the power supply is an important function of the D-STATCOM. A novel voltage control strategy based on active-disturbance rejection control under unbalance voltage conditions is proposed in this paper. The active-disturbance rejection control for D-STATCOM is proposed to overcome the difficulty result from the nonlinear, multivariable and coupling characteristics of...
Voltage sags and swells, voltage harmonics and voltage imbalances in power systems may affect sensitive loads causing production interruption or equipment damage. Now-a-days series voltage compensation using power electronics devices is a promising solution for these problems and the design, control and application of this type of devices have drawn much attention in the literature. Comprehensive...
Wind energy conversion systems using the doubly-fed induction generator (DFIG) are the most commercialized topology worldwide, because this technology uses converters dimensioned for ±30% of the system rated power, thus reducing the equipment cost. The direct connection of the DFIG stator to the electrical system increases its sensitivity to grid disturbances. In this context, this paper analyzes...
Unexpected voltage sags or outages events often interrupt the operation of manufacturing processes, or even lead to equipment damages. Numerous critical loads rely on the uninterruptible power supply (UPS) system to uphold the power during these events and maintain the normal operation. As disturbances occur in the utility, the UPS should take over the load within 1-5 ms to prevent any interruptions...
This paper proposes and outlines a systematic procedure based on intelligent control methods for the purpose of enhancing the design and associated performance of a medium-scale WECS with permanent magnet synchronous generator (PMSG) connected to a medium voltage (MV) distribution grid. More specifically are achieved rapid, accurate, stable and simultaneous: MPP tracking of the WT with PMSG, dc voltage...
Survey results suggest that 92% of interruption at industrial facilities is voltage sag related. The voltage sag compensator, based on a transformer-coupled series- connected voltage source inverter, is among the most cost- effective solution against voltage sags. Transformers are often installed in front of critical loads for electrical isolation purposes. When voltage sags happen, the transformers...
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