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In a generator, the power of the generator and the direction of motion are approximately the same direction. Water vapor does not work in the turbine generator set and provides the energy required to rotate the order of permanent magnet generators.
This energy comes from thermal energy from the generator. But the heat can not be directly converted into ordered energy. The turbine generator set and should not function as a heat engine, converting a limited amount of thermal energy into ordered energy as heat flows from a warmer object to a cooler object. The turbine generator set, the object is the hottest high pressure and colder object is the outside air or water. As the heat flows in the generator into the cold world about the nature and thermodynamics allow us to draw some heat from mechanical energy as ordered.
The exact definition of distributed generation varies somewhat among sources, however, generally agreed in the sense of power generation that occurs at or near the point of consumption rather than a central power plant of the season. Although this could include largest site generation facilities, the main focus of interest are sets of 20 to 30 MW or less. Some but not all of these include the use of combined heat and power (CHP) designs. The new interest in DG has been driven largely by technologies, customer needs and structural change.
- New small-scale, efficient technologies for power generation are the promise of the generation of performance previously only available in large central station plants.
- Changes in customer needs for electricity reliability of energy are creating more value for the high quality energy.
- Electric utility restructuring is creating new opportunities for self-generation as well as concerns about future costs and / or system reliability power generation plant.
The general definition of leadership includes on-site emergency generators have been in place for many years. One manifestation of the general direction is to create the opportunity to use these generators in new and expanded. Since these are very high emitters, this aspect of the overall direction has created a concern for environmental regulators that dominates much of the discussion of the DG. From the industry perspective "DG", however, the R & D and main business focus is the application of natural gas to new and advanced technologies based on the generation of much lower emissions. One challenge in this debate is to separate the potential value of new technologies of concern for the greater use of old equipment, which emit high. To address these issues, it helps to start with an overview of applications and technologies DG.
ApPLICATIONS
Compared to the broad base of technologies to generate useful load, distributed generation technologies have higher capital costs, high operating costs, or both. Thus, there are relatively few applications in today's markets or the general direction is economically competitive in a pure base load power base. In contrast, applications of DG tend to fill any special requirements to justify the additional cost.
Most requests the DG to fit one of three categories.
Emergency generation: This application has been for many years and prior to the broader concept of "distributed generation". There was always some installations and some charges at some facilities that can not tolerate any interruption in electrical service. Critical care with life support equipment are an example. With the growing importance of computers in the U.S. industry and trade, intolerance, even for short breaks are becoming more common. In these applications, an automatic power monitors and automatically initiates a back-up generators in case of failure. Breakers to connect the generator to support critical loads.
Reciprocating engines are generating technology that can offer immediate start required by these applications. In addition, some living standards of safety require the use of fuel stored on site, rather than natural gas, which could be subject to interruption during an emergency. Diesel engines have historically been the lowest cost, fastest starting and most common choice. Although they have very high emissions of NOx, the actual hours of operation due to network outage in a year are very low. The solution to limit emissions regulations has been to limit the hours of operation from 100 to 500 hours per year, including periodic testing.
Note that the schedule of hours of emergency operation usually does not correlate with the time of the main air quality problems (excess ozone). Grid interruptions tend to be during periods of bad weather (storm or ice storm) sometimes the ozone layer, which are not high, or related to mechanical disruption (construction or accident) that are not correlated with the problems of air quality.
The use of generators for emergency www.grupoelectrogeno3000.es is especially to provide energy at peak hours, has also been common for many years. Its use is limited however due to the structure of electricity tariffs that limited economic value or discouraged its celebration. The peak potential in the site / razor burden has increased for various reasons related to the restructuring of the electricity industry:
- More transparent pricing structures to offer economic incentives stronger for electricity customers to reduce peak loads.
- Electric charges increasingly sensitive and increasing the reliability / power quality problems with central power supply, have created a demand for on-site generation. Many of the quality of energy and connection problems are related to the insufficient capacity of generation or transmission and distribution constraints in the core network. The economic value of power outage is great for a growing number of customers so they can afford increasingly generating site.
- In some cases, the network is actively seeking site generators as a source of generation capacity. In some cases, the ISO paid very high market rates for generators for peak power of the Web. This may be an important engine for the installation of peak / load shaving generation.
The duration of peak / load shaving operation varies according to region, but is likely to be higher than the emergency back-up use - possibly several hundred thousand hours. In many places, some of the peak / load shaving operation is correlated with days of the ozone problem. Many of the peaks in demand are correlated with hot summer days are the days that the ozone problem. Peak / load shaving for the winter peak demand (common in many areas) not, of course, contribute to the overcoming of ozone, except in some southern areas.
