Active and reactive energy

This paper illustrates the scheme of integrating of photo-voltaic (PV) system as distributed generation to micro-grid. PV system is integrated to grid with three-level inverter and five-level cascaded H-Bridge inverter to invert the type of supply synchronized to grid. Inverter will be controlled with simple current control strategy. Results were presented for the proposed work considering cases like DG sending only active power and DG injecting both active and reactive power through three-level and five-level inverter topologies.

13p phanngocminhtam 14-09-2021 10 1   Download

n recent years, renewable energy sources have greatly affected the structure and operation of power systems. Previously, grid-connected PV generators using inverters were only allowed to generate active power to ensure the utilities to adjust the voltage in the distribution grid. It is no longer optimal for system power transmission and system stability, especially when solar power sources with a capacity of hundreds of MWs having a role in regulating grid voltage. Accordingly, this paper proposes a smart inverter model of a gridconnected PV system that can regulate the reactive power.

5p kequaidan11 13-04-2021 13 2   Download

The paper presents the study of high harmonics influence on power metering by static meters for active and reactive energy. The review and analysis of manufacturer’s documents and standards in the field of electricity meters testing was conducted and mathematical models for calculating active and reactive energy were identified.

6p lucastanguyen 01-06-2020 10 1   Download

In Lyme Borreliosis, western blot is the preferred serologic test. Antigen detection tests (antigen capture and PCR), although insensitive, are very specific and are especially helpful in evaluating the seronegative patient and those still ill or relapsing after therapy. Often, these antigen detection tests are the only positive markers of Bb infection, as seronegativity has been reported to occur in as many as 30% to 50% of cases. Nevertheless, active LB can be present even if all of these tests are non-reactive! Clinical diagnosis is therefore required.

45p can_thai 12-12-2012 40 1   Download

In a book titled Photosynthesis it is easy to forget that light is not simply the energy driving plant metabolism. Light also is the central environmental factor that affects plant size, shape and development. In fact, light activation of photomorphogenic signaling pathways sets the stage for photosynthesis and ensures the maintenance of the apparatus. The effects of specific wavebands of light exert their influence on plant biology from the molecular level all the way up to the higher morphological level, and even contribute to the canopy form as a whole.

330p conquynho32 15-09-2012 58 7   Download

However, from an energetic point of view, it has been debated that phenolics favour hydrogen atom transfer mechanisms, in which lower energies are involved (Leopoldini et al., 2011). The radicals derived from oxygen represent the most important class of radical species generated in living systems. However the term antioxidant is often used to describe the scavenging activity of all reactive radicals including e.g. RNS radicals.

350p wqwqwqwqwq 23-07-2012 65 11   Download

AT is recognized as the largest energy store of free fatty acids (FFA) and triglycerides (TG), and more recently as an endocrine organ that regulates the secretion of adipokines, which coordinate energy metabolism, insulin sensitivity and feeding behavior, not only in adults but also in pediatric populations. Imbalance between visceral and subcutaneous AT is capable of altering its physiology.

110p wqwqwqwqwq 20-07-2012 63 3   Download