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Capability Curve
Capability curve of an electrical generator describes the limits of the active power, active (Megawatt, MW) and reactive power (MVAr) that the generator can provide. The curve represents a boundary of all operating points in the MW/MVAr plane; it is typically drawn with the real power on the horizontal axis, and, for the synchronous generator, resembles a letter D in shape, thus another name for the same curve, D-curve. In some sources the axes are switched, and the curve gets a dome-shaped appearance. Synchronous generators For a traditional synchronous generator the curve consists of multiple segments, each due to some physical constraint: * at the right part of the curve (close to the rated voltage), the generator is constrained by the heat dissipation in the Armature (electrical), armature (stator for large generators). The heating is proportional to the sum of squares of active and reactive currents, at the near-constant voltage it is closely proportional to the sum of squar ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Capability Curve Of An Electrical Generator
A capability is the ability to execute a specified course of action or to achieve certain outcomes. As it applies to human capital, capability represents performing or achieving certain actions/outcomes in terms of the intersection of capacity and ability. Capability may also refer to: Engineering * Capability (systems engineering), the ability to execute a specified course of action * Capability management, integrative management function in the defense sector Computing * Capability-based addressing, scheme used by some computers to control access to memory * Capability-based security, concept in the design of secure computing systems Economics * Capability Maturity Model, a development model * Capability Maturity Model Integration, a process improvement training and appraisal program * Dynamic capabilities, theory in organizational sciences * Capability management in business, capacity, materials, and expertise an organization needs in order to perform core functions * Capabi ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Capability Curve Of An Electrical Generator Expanded With Cooling
A capability is the ability to execute a specified course of action or to achieve certain outcomes. As it applies to human capital, capability represents performing or achieving certain actions/outcomes in terms of the intersection of capacity and ability. Capability may also refer to: Engineering * Capability (systems engineering), the ability to execute a specified course of action * Capability management, integrative management function in the defense sector Computing * Capability-based addressing, scheme used by some computers to control access to memory * Capability-based security, concept in the design of secure computing systems Economics * Capability Maturity Model, a development model * Capability Maturity Model Integration, a process improvement training and appraisal program * Dynamic capabilities, theory in organizational sciences * Capability management in business, capacity, materials, and expertise an organization needs in order to perform core functions * ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Voltage Control
Voltage control and reactive power management are two facets of an ancillary service that enables reliability of the transmission networks and facilitates the electricity market on these networks. Both aspects of this activity are intertwined (voltage change in an alternating current (AC) network is effected through production or absorption of reactive power), so within this article the term ''voltage control'' will be primarily used to designate this essentially single activity, as suggested by Kirby & Hirst (1997). Voltage control does not include reactive power injections within one AC cycle, these are a part of a separate ancillary service, so called system stability service. The transmission of reactive power is limited by its nature, so the voltage control is provided through pieces of equipment distributed throughout the power grid, unlike the frequency control that is based on maintaining the overall active power balance in the system. Need for voltage control Kirby & H ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Fixed Speed Wind Turbine
Fixed may refer to: * Fixed (EP), ''Fixed'' (EP), EP by Nine Inch Nails * ''Fixed'', an upcoming 2D adult animated film directed by Genndy Tartakovsky * Fixed (typeface), a collection of monospace bitmap fonts that is distributed with the X Window System * Fixed, subjected to neutering * Fixed point (mathematics), a point that is mapped to itself by the function * Fixed line telephone, landline See also * * * Fix (other) * Fixer (other) * Fixing (other) * Fixture (other) {{disambiguation ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
STATCOM
A static synchronous compensator (STATCOM), originally known as a static synchronous condenser (STATCON), is a regulating device shunt-connected to alternating current electricity transmission network. It is based on a power electronics voltage-source converter and can act as either a source or sink of reactive AC power to an electricity network. If connected to a source of power it can also provide active AC power. It is a member of the FACTS family of devices, that became possible in 1990s due to availability of powerful gate turn-off thyristors (GTO). STATCOM is inherently modular and electable. These compensators can also be used to reduce voltage fluctuations. History and uses A prototype 1 MVAr STATCON was described in a report by Empire State Electric Energy Research Corporation in 1987. The first production 100 MVAr STATCON made by Westinghouse Electric was installed at the Tennessee Valley Authority Sullivan substation in 1995 and was quickly retired due to obsolesc ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Voltage Regulation
In electrical engineering, particularly power engineering, voltage regulation is a measure of change in the voltage magnitude between the sending and receiving end of a component, such as a transmission or distribution line. Voltage regulation describes the ability of a system to provide near constant voltage over a wide range of load conditions. The term may refer to a passive property that results in more or less voltage drop under various load conditions, or to the active intervention with devices for the specific purpose of adjusting voltage. Electrical power systems In electrical power systems, voltage regulation is a dimensionless quantity defined at the receiving end of a transmission line as: :\text VR = \frac \times 100 where ''Vnl'' is voltage at no load and ''Vfl'' is voltage at full load. The percent voltage regulation of an ideal transmission line, as defined by a transmission line with zero resistance and reactance, would equal zero due to ''Vnl'' equaling ''Vfl'' a ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Doubly-fed Induction Generator
Doubly-fed electric machines also slip-ring generators are electric motors or electric generators, where both the field magnet windings and armature windings are separately connected to equipment outside the machine. By feeding adjustable frequency AC power to the field windings, the magnetic field can be made to rotate, allowing variation in motor or generator speed. This is useful, for instance, for generators used in wind turbines. DFIG-based wind turbines, because of their flexibility and ability to control active and reactive power, are almost the most interesting wind turbine technology. Introduction Doubly fed electrical generators are similar to AC electrical generators, but have additional features which allow them to run at speeds slightly above or below their natural synchronous speed. This is useful for large variable speed wind turbines, because wind speed can change suddenly. When a gust of wind hits a wind turbine, the blades try to s ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Photovoltaics
Photovoltaics (PV) is the conversion of light into electricity using semiconducting materials that exhibit the photovoltaic effect, a phenomenon studied in physics, photochemistry, and electrochemistry. The photovoltaic effect is commercially used for electricity generation and as photosensors. A photovoltaic system employs solar modules, each comprising a number of solar cells, which generate electrical power. PV installations may be ground-mounted, rooftop-mounted, wall-mounted or floating. The mount may be fixed or use a solar tracker to follow the sun across the sky. Photovoltaic technology helps to mitigate climate change because it emits much less carbon dioxide than fossil fuels. Solar PV has specific advantages as an energy source: once installed, its operation generates no pollution and no greenhouse gas emissions, it shows scalability in respect of power needs and silicon has large availability in the Earth's crust, although other materials required in PV system m ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Power Converter
Power most often refers to: * Power (physics), meaning "rate of doing work" ** Engine power, the power put out by an engine ** Electric power * Power (social and political), the ability to influence people or events ** Abusive power Power may also refer to: Mathematics, science and technology Computing * IBM POWER (software), an IBM operating system enhancement package * IBM POWER architecture, a RISC instruction set architecture * Power ISA, a RISC instruction set architecture derived from PowerPC * IBM Power microprocessors, made by IBM, which implement those RISC architectures * Power.org, a predecessor to the OpenPOWER Foundation * SGI POWER Challenge, a line of SGI supercomputers Mathematics * Exponentiation, "''x'' to the power of ''y''" * Power function * Power of a point * Statistical power Physics * Magnification, the factor by which an optical system enlarges an image * Optical power, the degree to which a lens converges or diverges light Social sciences and polit ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Variable Renewable Energy
Variable renewable energy (VRE) or intermittent renewable energy sources (IRES) are renewable energy sources that are not dispatchable due to their fluctuating nature, such as wind power and solar power, as opposed to controllable renewable energy sources, such as dammed hydroelectricity or biomass, or relatively constant sources, such as geothermal power. The use of small amounts of intermittent power has little effect on grid operations. Using larger amounts of intermittent power may require upgrades or even a redesign of the grid infrastructure. Options to absorb large shares of variable energy into the grid include using storage, improved interconnection between different variable sources to smooth out supply, using dispatchable energy sources such as hydroelectricity and having overcapacity, so that sufficient energy is produced even when weather is less favourable. More connections between the energy sector and the building, transport and industrial sectors may also help. ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Capability Curves For Generators With Full Converters
A capability is the ability to execute a specified course of action or to achieve certain outcomes. As it applies to human capital, capability represents performing or achieving certain actions/outcomes in terms of the intersection of capacity and ability. Capability may also refer to: Engineering * Capability (systems engineering), the ability to execute a specified course of action * Capability management, integrative management function in the defense sector Computing * Capability-based addressing, scheme used by some computers to control access to memory * Capability-based security, concept in the design of secure computing systems Economics * Capability Maturity Model, a development model * Capability Maturity Model Integration, a process improvement training and appraisal program * Dynamic capabilities, theory in organizational sciences * Capability management in business, capacity, materials, and expertise an organization needs in order to perform core functions * ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Synchronous Condenser
In electrical engineering, a synchronous condenser (sometimes called a syncon, synchronous capacitor or synchronous compensator) is a DC-excited synchronous motor, whose shaft is not connected to anything but spins freely.B. M. Weedy, Electric Power Systems Second Edition, John Wiley and Sons, London, 1972, page 149 Its purpose is not to convert electric power to mechanical power or vice versa, but to adjust conditions on the electric power transmission grid. Its field is controlled by a voltage regulator to either generate or absorb reactive power as needed to adjust the grid's voltage, or to improve power factor. The condenser’s installation and operation are identical to large electric motors and generators (some generators are actually designed to be able to operate as synchronous condensers with the prime mover disconnected). Increasing the device's field excitation results in its furnishing reactive power (measured in units of var) to the system. Its principal advantage ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
