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Case Study #4
Published in Tony Giampaolo, Gas Turbine Handbook: Principles and Practice, 2020
Twelve Capstone MicroTurbines™ are located at the school to provide the electricity and heat from the LFG. Each Capstone MicroTurbineTM fueled by the landfill gas produces up to 30 kW of three-phase electricity at 480 volts, using 12 to 16 cubic feet per minute (cfm) of landfill gas for a total of 360 kW of electricity—enough to power the equivalent of approximately 120 homes. The microturbine system incorporates a combustor, a turbine, and a generator. The rotating components are mounted on a single shaft supported by air bearings that rotate at up to 96,000 RPM. The generator is cooled by airflow into the gas turbine. Built-in relay protection (over/under voltage and over/under frequency) automatically trips off the microturbines in the event of a utility system outage or a power quality disturbance. Excess electricity not used by ACHS is sold to Commonwealth Edison. A 12-turbine system was selected to provide a system that will remain functional as LFG production from HOD Landfill decreases. Based on the initial LFG collection rates, up to 18 turbines could have been installed. The final payback for this project, based on conservative assumptions for future energy costs, is approximately 8 years. The installed microturbines are shown on Figure 18-5.
Electric Power Production
Published in J. Lawrence, P.E. Vogt, Electricity Pricing, 2017
Locally sited, gas-powered generators, which are typically sized to serve a single customer or a small group of customers, represent a major component of distributed generation (DG), or in a broader perspective, distributed resources (DR). Advances in microturbine technology have reduced the footprint of these units thus making them more practical for smaller customer applications. Micro-turbines have a capacity range of a few kW to a few hundred kW, but multiple units can be configured in the same installation to collectively produce a much higher capacity. High-pressure natural gas is often used as a fuel source for micro-turbines, although they can be operated on other gaseous and liquid fuel sources. Low-pressure gas sources, such as from landfill methane, require the use of auxiliary compressors. Microturbines typically are air-cooled, have one moving part, and operate at very high rotational speeds while producing standard secondary level voltages (e.g., 480Y/277 volts).
Control and Analysis of Hybrid Renewable Energy Systems
Published in Gou Bei, Ki Na Woon, Diong Bill, Fuel Cells, 2017
Gou Bei, Ki Na Woon, Diong Bill
Many alternative energy sources including wind, PV, fuel cell, diesel system, gas turbine, and microturbine can be used to build a hybrid energy system [2–12]. Nevertheless, the major renewable energy sources used and reported are wind and PV power [2–12]. Due to the intermittent nature of wind and solar energies, stand-alone wind and PV energy systems normally require energy storage devices or some other generation sources to form a hybrid system. The storage device can be a battery bank, supercapacitor bank, superconducting magnetic energy storage, or a fuel cell–electrolyzer system.
Detection of Islanding and Fault Disturbances in Microgrid using Wavelet Packet Transform
Published in IETE Journal of Research, 2019
Prakash K. Ray, Basanta K. Panigrahi, Pravat K. Rout, Asit Mohanty, Foo Y. S. Eddy, Hoay Beng Gooi
Microturbine is usually utilised in transportation sectors, but now-a-days, thought of supplying electrical energy to different loads and applications. In the coming years, it is expected to be one of the promising technologies for alternative power generation due to its merits like growing research and developments, less moving parts, less maintenance, its flexibility in the way it can be connected to load; stand-alone or grid-connected mode, back-up power, minimising the stress on the grid during peak load demand, etc. The power capacity may range from 25 kW to 500 kW with variable speed ranges depending upon the type of application. The main components of the microturbine are the compressor, recuperator, combustion chamber and turbine, similar to that of a gas turbine, but are comparatively smaller in size. The compressor increases the air and pushes it into the combustion chamber. There, it is mixed with the input fuel to be burned in the combustion chamber. The hot gas with increased pressure is converted to mechanical energy by the turbines and fed to generator for converting it into electrical energy [17,18].