reactive power


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reactive power:

see power, electricpower, electric,
energy dissipated in an electrical or electronic circuit or device per unit of time. The electrical energy supplied by a current to an appliance enables it to do work or provide some other form of energy such as light or heat.
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The Columbia Electronic Encyclopedia™ Copyright © 2013, Columbia University Press. Licensed from Columbia University Press. All rights reserved. www.cc.columbia.edu/cu/cup/
The following article is from The Great Soviet Encyclopedia (1979). It might be outdated or ideologically biased.

Reactive Power

 

the quantity that describes the load created in electric equipment by the energy oscillations of an electromagnetic field in an AC network. The reactive power Q is equal to the product of the operating value of the voltage U and the current I multiplied by the sine of the angle of the phase shift Φ between them: Q = UI sin Φ. It is measured in vars. Reactive power is related to the apparent power S and the active power P by the expression Reactive Power.

The reactive power consumed in electric circuits creates additional resistance losses, which are met by the expenditure of energy at power stations, and voltage losses, which degrade the voltage regulation conditions. In some electric installations, the reactive power may be substantially greater than the active power. This causes high reactive currents to develop and overloads the current sources. In order to avoid overloads and to improve the power factor of electric installations, the reactive power is compensated.

The Great Soviet Encyclopedia, 3rd Edition (1970-1979). © 2010 The Gale Group, Inc. All rights reserved.

reactive power

[rē′ak·tiv ′pau̇·ər]
(electricity)
The power value obtained by multiplying together the effective value of current in amperes, the effective value of voltage in volts, and the sine of the angular phase difference between current and voltage. Also known as wattless power.
McGraw-Hill Dictionary of Scientific & Technical Terms, 6E, Copyright © 2003 by The McGraw-Hill Companies, Inc.
References in periodicals archive ?
The above 200 MVAr segment of synchronous condensers is expected to be the largest market, by reactive power rating, during the forecast period.
To enable the decoupling of the active and reactive power in the hybrid system, we need to omit some secondary factors in the Jacobi matrix based on the steady-state characteristics of AC/DC grids.
The goal of the paper is study of modes in a threephase power supply system with a linear asymmetric load to identify the ambiguity of solution of the problem of synthesizing parameters of the compensator in the modes of full compensation of reactive power.
Optimal compensation should ensure minimal costs of the reactive power generation and transmission within the considered system.
Type-IV: Generate active power but consume reactive power (ex.
Reactive power compensation - or, simply put, power factorcorrection - is an efficient and economical way of improving the power factor and thereby reducing the burden on networks.
During the scheme above, due to the limit of the power factor, adjusting the reactive power of the inverter has limited effect on voltage adjustment, and the installing of reactive compensation equipment and energy storage equipment brings additional investment.
In this context, to face the stringent specifications of maximum wind power tracking and reactive power control problems of doubly fed wind turbine system where the uncertainties are subjected to fast variations, this paper proposes a new adaptive control gain second-order sliding mode scheme.
A family of different devices which can control the reactive power at designated buses is given the name Flexible AC Transmission Systems (FACTS).
A model that represents a shunt hybrid active power filters application mainly for current harmonic elimination and fixed reactive power compensation [2].

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