Topic
Power optimizer
About: Power optimizer is a research topic. Over the lifetime, 10525 publications have been published within this topic receiving 199245 citations.
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TL;DR: In this paper, an evolutionary algorithm technique, also known as particle swarm optimization, was employed to detect the local maximum power point (MPP) instead of the global MPP and reduce the efficiency of PV systems even further.
Abstract: Partial shading is one of the unavoidable complications in the field of solar power generation. Although the most common approach in increasing a photovoltaic (PV) array's efficiency has always been to introduce a bypass diode to the said array, this poses another problem in the form of multi-peaks curves whenever the modules are partially shaded. To further complicate matters, most conventional Maximum Power Point Tracking methods develop errors under certain circumstances (for example, they detect the local Maximum Power Point (MPP) instead of the global MPP) and reduce the efficiency of PV systems even further. Presently, much research has been undertaken to improve upon them. This study aims to employ an evolutionary algorithm technique, also known as particle swarm optimization, in MPP detection.
57 citations
01 Oct 2006
TL;DR: In this article, a detailed model of the WT with doubly fed induction generator (DFIG) and its associated controllers is presented, based on which the small signal stability model is derived.
Abstract: The growing integration of wind energy into power networks will have a significant impact on power system stability. With the development of wind turbine (WT) techniques, the doubly fed induction generator (DFIG) becomes the dominant WT type used in wind farms. In this situation, DFIG should be modeled properly in power system stability analysis. A detailed model of the WT with DFIG and its associated controllers is presented, based on which the small signal stability model is derived. Small signal stability analysis shows that the DFIG control can significantly improve the stability of WT system. Applying a set of optimized controller parameters, the stability can be further enhanced. Dynamic simulations are performed to illustrate the control performance
57 citations
05 Nov 2002
TL;DR: This paper presents a circuit configuration with power factor correction by a third type of buck boost converter, termed a 'CSC, canonical switching cell', suitable for power factor Correction.
Abstract: The conventional boost converters are generally used for rectifier circuits with power factor correction, and as a result the output voltage becomes limited. To expand the controlled voltage range, buck-boost or Cuk converter types should be utilized. This paper presents a circuit configuration with power factor correction by a third type of buck boost converter, termed a 'CSC, canonical switching cell'. Single-phase power factor correction using a buck boost converter can control the output voltage over a wide range, because it has the ability to step-up and step-down the output voltage. Firstly, this paper compares the mechanisms of the power transmission and the characteristics based on total stored energy. Secondly, CSC converter is applied to the single-phase power factor correction. It is presented that this converter is suitable for power factor correction.
56 citations
TL;DR: In this article, an energy capacitor system (ECS), which combines power electronic devices and electric double-layer capacitor, can significantly decrease voltage and power fluctuations of grid-connected fixed-speed wind generator.
Abstract: In this paper, it is reported that energy capacitor system (ECS), which combines power electronic devices and electric double-layer capacitor, can significantly decrease voltage and power fluctuations of grid-connected fixed-speed wind generator. The proper selection of wind farm output power reference is still a problem for smoothing the wind farm output power. This paper proposes exponential moving average to generate the reference output power of a grid-connected wind farm. The objective of the control system is to follow the line power reference by absorbing or providing real power to or from the ECS. Moreover, the necessary reactive power can also be supplied to keep the wind farm terminal voltage at the desired reference level. Real wind speed data were used in the simulation analyses, which validate the effectiveness of the proposed control strategy. Simulation results clearly show that our proposed ECS can be suitable for wind power application. Copyright © 2007 John Wiley & Sons, Ltd.
56 citations
Patent•
14 Jul 2006
TL;DR: In this paper, a wind turbine is connected to an electrical power grid and uses a magnet generator as the only electrical power generator element both in the normal operation of the turbine and during periods in which the turbine is disconnected from the power grid.
Abstract: The invention relates to a wind turbine (1) which is connected to an electrical power grid (23) and which uses a magnet generator (6) as the only electrical power generator element both in the normal operation thereof and during periods in which the turbine is disconnected from the electrical power grid. The aforementioned wind turbine can perform operations in order to maintain the wind turbine systems operational, with the continued generation of electrical power, and to adjust the quantity of electrical power produced for power consumption during the periods in which the turbine is disconnected from the electrical power grid.
56 citations