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The change to a sustainable energy supply advances further development in grid interconnection, especially for offshore wind farms. This enables future wind farms to be interconnected by high voltage dc transmission grids. In this paper, a case study for dc grid with integrated offshore wind farms is studied and a system control is developed.
Conventional direct power control (DPC) technique is a simple and efficient control strategy for three-phase PWM rectifier. However, its performance is deteriorated when the converter is supplied by unbalanced or distorted grid voltages. This paper presents the design and implementation of a new DPC scheme based on disturbance rejection principle to achieve sinusoidal input currents operation of three-phase...
The wind power generation system connected to DC line has been investigated recently. We have proposed new converter exciting induction generator system for dc output to reduce the system cost. This paper shows that the rating of the converter can be reduced by using the 3rd harmonic injection control. 3rd harmonic injection control can increase the ac output voltage with same dc voltage. Both experimental...
The work described in this paper deals with the analytical design and optimization of a line-start permanent magnet synchronous motor (LSPM) with a series magnetic circuit structure. The design approach considers a LSPM as an induction motor (IM) combined with a permanent magnet rotor arrangement and takes into account the characteristics of both asynchronous and synchronous regimes.
This paper presents a simple rectifier configuration for SCIG (squirrel cage induction generator) applied to variable speed wind turbines. The proposed rectifier consists of a diode rectifier and a series reactive power compensator named MERS. Advantages of this configuration are reduced active semi-conductor device rating needed and line frequency switching operation of the series compensator. Experimental...
Due to new grid codes for grid connected photovoltaic power generation, since 2012 PV inverters have to be able to feed in reactive power down to a power factor of cos(ϕ) = 0.9 besides their normal operation with pure active power [1]. In this paper the influence of different semiconductors on the power losses as function of the power factor will be studied on the base of a three-level MNPC topology...
Efficiency is a fundamental UPS performance criterion. Remarkably, UPS efficiency in field applications may deviate from controlled laboratory conditions. This paper focuses on the impact of mains supply on double-conversion UPS efficiency. As the mains supply mostly affects the rectifier section, the results also provide a reference on the impact of mains supply on rectifier efficiency.
In this paper the impact of photovoltaic (PV) system connected to the medium voltage distribution gird using three-phase three-level inverter and step-up transformer will be investigated. The PV inverter is capable to control active and reactive power independently. The impact to the grid voltage profile of both active and reactive power regulation of the PV system will be examined. In order to simplify...
Because of the rapid increase of distributed generation, active voltage regulation becomes relevant for low voltage networks. In this paper, several power electronic voltage regulation approaches are presented and compared to each other through a Monte-Carlo-based network analysis. The focus of the investigation is on a series voltage regulator, for which simulation results and experimental results...
PFC controllers usually need three sensors. A digital implementation with pre-calculated duty cycles can reduce the number of sensors. The disadvantage of using pre-calculated duty cycles is that power factor is very sensitive to any non-idealities, so some kind of regulation is necessary. A single ADC and single loop technique is proposed and it obtains a high power factor under non-nominal conditions.
This paper presents a directly driven wave power generation system which is connected to power grid composed of permanent magnetic linear generator(PMLG), generator side converter, grid side converter, controller and grid. Control strategies based on back to back converter structure was proposed: vector decoupling control was used to generator side converter aiming at optimize power extraction from...
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