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INVENTION
Patent of the Russian Federation RU2006127
DEVICE FOR VOLTAGE REGULATION AND REACTIVE POWER
The name of the inventor: Kozurman Igor Anatolievich
The name of the patent holder: Kozurman Igor Anatolievich
Address for correspondence:
Date of commencement of the patent: 1991.09.16
Use: in electric power distribution systems to compensate for voltage fluctuations depending on fluctuations in the magnitude of the load and voltage regulation in the supply network. SUMMARY OF THE INVENTION: The device is equipped with a potential-regulator connected to the secondary winding of the transformer-reactor, the capacitor bank is connected to the point of connection of the primary and secondary windings of the potential-regulator and to the beginning of the secondary winding of the transformer-reactor, the inductive resistance of the primary winding of the potential-regulator should be equal to the capacitive Resistance of the capacitor bank. When the angle of the magnetic coupling between the primary and secondary windings of the potential-regulator changes, the current in the secondary winding of the transformer-reactor changes, and, consequently, the equivalent resistance of the primary winding of the transformer-reactor.
DESCRIPTION OF THE INVENTION
The invention relates to electric power distribution systems, is intended to compensate for voltage fluctuations as a function of fluctuations in the magnitude of the load, but also to regulate reactive power.
A device for regulating voltage and reactive power is known, comprising a transformer-reactor whose primary winding is connected in series with the load, and the first secondary winding is connected in series with the capacitor bank to the mains voltage, the beginning of this winding being connected to the network between the end of the primary winding and the load; The transformer reactor is provided with a second secondary winding connected through the thyristor switch to the mains voltage, the beginning of the second secondary winding being connected to the beginning of the first secondary winding [1].
A device for regulating voltage and reactive power is also known, comprising a transformer-reactor whose primary winding is connected in series with the load, and the secondary winding is connected in series with the capacitor bank to the mains voltage, the beginning of this winding being connected to the network between the end of the primary winding and the load [2 ].
These devices have the following drawbacks.
They contain a thyristor key, the presence of which causes distortion of the shape of the voltage curve; The capacitor bank is switched on to the full voltage of the network, which entails an increase in its size and cost; Provides the ability to compensate for voltage fluctuations caused by changes in the magnitude of the load, do not allow the regulation of voltage in the supply network; Insufficient limits of voltage regulation and reactive power.
The object of the invention is to improve the quality of electrical energy by improving the shape of the voltage curve (compared to other control methods) and expanding the limits and smoothness of the latter's regulation.
The figure shows the electrical diagram of the device.
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The device contains a potential controller 1 connected to the secondary winding of the transformer-reactor 2, a capacitor bank 3 connected to the connection point of the primary and secondary windings of the potential-regulator 1 and to the beginning of the secondary winding of the transformer-reactor 2. The primary winding of the transformer-reactor is connected in series with Load 4. The inductive resistance of the primary winding of the potential-regulator 1 must be equal to the capacitive resistance of the capacitor bank 3. The primary winding of the transformer-reactor 2 through the resistance of the line 5 is connected to a voltage source 6. The principle of operation of the device is based on changing the equivalent resistance of the primary winding of the transformer-reactor 2 by regulating the current in its secondary winding by means of a potential-regulator 1. |
When the magnetic coupling angle is changed 
Between the primary and secondary windings of the potential-regulator 1, the current in the secondary winding of the transformer-reactor 2 changes, and, consequently, the equivalent resistance of the primary winding of the transformer-reactor 2.
In this case, the voltage change on load 4 is determined by the following dependencies:
The equivalent resistance Z e of the primary winding of the transformer-reactor is determined by the following relationship:
Where x 1 is the inductive resistance of the primary winding
Potential-regulator, Ohm;
X 2 - inductive resistance of the secondary winding of the potential-regulator, Ohm;
X 3 - inductive resistance of the secondary winding of the transformer-reactor, Ohm;
X 4 - inductive resistance of the primary winding of the transformer-reactor, Ohm;
Х С - capacitive resistance of the capacitor bank, Ohm;
К св1 - the coefficient of magnetic coupling between the primary and secondary windings of the transformer-reactor;
K c 2 - the coefficient of magnetic coupling between the primary and secondary windings of the potential-regulator; - the angle of magnetic coupling between the primary and secondary windings of the potential-regulator.
The capacitor bank 3 and the potential-regulator 1 for the said connection and with these parameters are an inductive capacitive converter, which is a source of reactive power.
When the magnetic coupling angle is changed Between the primary x 1 and secondary x 2 windings of the potential-regulator 1, the currents in these windings change. The magnitude of the reactive power produced by the inductive capacitive converter depends on the current I 2 in the secondary winding of the potential-regulator 1: 
This device does not contain non-linear elements, therefore, the shape of the voltage curve is not distorted when its voltage is compensated.
In the process of regulation, the equivalent resistance of the primary winding of the transformer-reactor can be either capacitive or inductive, so the voltage regulation range increases.
The use of a potential-regulator ensures the smoothness of voltage regulation on the load.
In addition, the network and the capacitor bank are electrically separated, which allows you to calculate the battery for a lower voltage. This reduces its size and reduces its cost.
Known devices are widely used in electrical networks for voltage regulation and reactive power. The proposed device, which has a number of advantages over the known ones, will be preferable to others, especially in networks with loads sensitive to the quality of the voltage / shape of the curve, but also in those cases where large control limits and its smoothness are required.
This device can be assembled from elements manufactured by the industry serially.
(56) Authors' certificate of the USSR N 1149347, cl. H 02 J 3/12, 1982.
The author's certificate of the USSR N 1282258, cl. H 02 J 3/18, 1984.
CLAIM
A VOLTAGE AND REACTIVE POWER CONTROL UNIT comprising a transformer reactor whose primary winding is connected in series with the load, and a capacitor bank characterized in that it is provided with a potential controller connected to the secondary of the transformer reactor, the capacitor bank is connected to the connection point of the primary And secondary windings of the potential-regulator and to the beginning of the secondary winding of the transformer-reactor, and the inductive resistance of the primary winding of the potential-regulator should be equal to the capacitive resistance of the capacitor bank.
print version
Published on February 15, 2007
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