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INVENTION
Patent of the Russian Federation RU2210156
REACTIVE POWER COMPENSATION SYSTEM
The name of the inventor: Mordovian State University. N.P. Ogareva
(72) The name of the inventor: Igolnikov Yu.S.
The name of the patent holder: Mordovian State University. N.P. Ogareva
Address for correspondence: 430000, Mordovia, Saransk, ul. Bolshevistskaya, 68, Mordovian State University. N.P. Ogareva, Department of Patents and Standards
Date of commencement of the patent: 2001.04.04
The invention relates to the field of electric power industry, namely to reactive power compensation systems in alternating current networks. The technical result consists in expanding the number of stages of reactive power control. The essence is that the system consists of two devices 1 and 2, executed in the same way and containing the same functional elements. The device 1 comprises a bridge bridge converter 3 connected to AC phases A, B, C through capacitor banks 4, 5, 6 and reactors 7, 8, 9. On the DC side, the bridge converter is shorted by a thyristor 10, a chain of a series-connected resistor 11 and thyristor 12 and a chain of capacitor 13 and thyristor 14. Resistor 11 serves to limit the charging current of capacitors 4, 5, 6. Condenser 13 serves to forcibly turn off thyristor 14. Reactors 7, 8, 9 are installed to exclude resonant phenomena with the network. Similar elements comprise the device 2. Between the terminals 1 , B 1 , C 1 of each phase of the alternating current of the converter 3 and the same terminals A 2, B 2, C 2 of each phase of the alternating current of the converter 15 of the device 2, a chain consisting of 16- 18 and counter-parallel operated control valves 19-24. The AC input terminals of the converters of the same name are connected through the respective reactors and capacitors of the batteries to the opposite phases of the mains. Thus, for example, the output A 1 of the converter 3 is connected through the capacitor bank 6 and the reactor 9 with the phase "C" of the network, and the terminal A 2 of the converter 15 of the device 2 through the capacitor bank 25 and the reactor 26 is connected to the "A" phase of the supply network.
DESCRIPTION OF THE INVENTION
The invention relates to the field of electric power engineering, namely to reactive power compensation systems in alternating current networks.
A device for compensating reactive power is known (see SU 1415324, IPC-4 H 02 J 3/18, publ. 07.08.88) containing power capacitors, thyristors, a resistor, capacitors and a pair of counter-parallelly connected thyristors. Each of the thyristor pairs is shunted by a low-power resistor, respectively. Each of the capacitors has the same capacitance and is connected between one of the input terminals of the valve regulator and the phase of the network through a pair of counter-parallelly connected thyristors.
The disadvantage of this device is the range of regulation limited by only three steps.
The technical result consists in expanding the number of stages of reactive power control.
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The essence of the invention is that the reactive power compensation system includes in its composition a first reactive power compensation device comprising a bridge bridge converter connected to the phases of the alternating current network through reactors and capacitor banks installed between each reactor and the corresponding AC output of the bridge bridge converter , To the DC terminals of which are connected in parallel two chains made with the help of fully controlled keys, one of which is connected in series with the resistor. The said system is provided with a second same reactive power compensation device connected to the same network. Between the output of each phase of the alternating current of the gate bridge converter of the first device and the output of each phase of the alternating current of the second device, a chain consisting of a capacitor connected in series with a pair of counter-parallel controlled valves is connected. The same input terminals of the gate bridge converters of the devices are connected through the corresponding reactor and battery capacitors to the opposite phases of the network. The capacitances of the capacitor banks of the devices are chosen of different sizes. |
The figure shows the scheme of reactive power compensation consisting of two devices for reactive power compensation 1 and 2, made in the same scheme and containing the same functional elements. Thus, the device 1 comprises a bridge bridge converter 3 connected to AC phases A, B, C through capacitor banks 4, 5, 6 and reactors 7, 8, 9. On the DC side, the gate bridge converter is shorted by a thyristor 10 in series Connected resistor 11 and thyristor 12 and a chain of capacitor 13 and thyristor 14. Resistor 11 serves to limit the charging current of capacitor banks 4, 5, 6. Condenser 13 serves to forcibly turn off thyristor 14. Reactors 7, 8, 9 are installed to exclude resonance phenomena With the network. Similar elements include compensation device 2. Between the terminals A 1 , B 1 , C 1 of each phase of the alternating current of the bridge bridge converter 3 of the device 1 and the same terminals A 2 , B 2 , C 2 of each phase of the alternating current of the bridge bridge converter 15 of the device 2 A chain consisting of capacitors 16-18 and counter-parallel-connected control valves, for example thyristors 19-24, is included. The same input terminals of alternating current of the bridge bridge converters 3 and 15 are connected through the corresponding reactors and capacitors of the batteries to the opposite phases of the mains. Thus, for example, the output A 1 of the gateway bridge converter 3 of the device 1 is connected through the capacitor bank 6 and the reactor 9 with the phase "C" of the network, and the terminal A 2 of the gate bridge converter 15 of the device 2 through the capacitor bank 25 and the reactor is connected to the "A" Supply network. Such inclusion allows to obtain an additional stage of reactive power.
The reactive power compensation system provides 6 control stages, which are provided as follows. The maximum reactive power is achieved by simultaneously switching the bridge bridge converters 3 and 15 of devices 1 and 2, i.e. Short-circuit their outputs. At the same time, condenser batteries 4-6 and 25-27 operate in the system. When only the device 1 is switched on and the valve bridge converter 15 is turned off, the second control stage is reached. When the gate bridge converter 15 of the device 2 is switched on and the valve bridge converter 3 is switched off, the third control stage is reached, since only condenser batteries 25-27 will be in operation. Shorting the input of the gate bridge converter 3 of the device 1 and turning on the counter-parallel valve pairs, for example thyristors 19-24, a fourth control stage is obtained, the reactive power of which is determined by the total reactive power of the capacitor banks 25-27 and connected in series through the counter-parallelly connected thyristors 19-24, capacitors 16-18. Similarly, when the device 2 is switched on and the thyristors 19-24 are turned on and connected in parallel, the fifth stage of reactive power is obtained. If both bridge circuits of devices 1 and 2 are turned off and only the counter-parallel pairs of thyristors 19-24 are switched on, the sixth stage of reactive power corresponding to the minimum reactive power will be realized, since all the capacitors will appear in each line in series through a corresponding pair of counter-parallel The valves are connected to a line voltage.
In comparison with the known solutions, the proposed one allows to expand the number of reactive power control stages with only three capacitor batteries.
CLAIM
1. A reactive power compensation system comprising a first reactive power compensation device comprising a bridged bridge converter connected to phases of the alternating current network through reactors and capacitor batteries installed between each reactor and the corresponding AC output of the bridge bridge converter to the terminals of the permanent Which is connected in parallel to two chains made with fully controlled keys, one of which is connected in series with the resistor, characterized in that said system is provided with a second same reactive power compensation device connected to the same network, and between the output of each phase of the variable Current of the bridge bridge converter of the first device and the output of each phase of the alternating current of the second device, a chain consisting of a capacitor connected in series with a pair of counter-parallel controlled valves is connected, the same input terminals of gate bridge converters of reactive power compensation devices are connected through respective reactors and battery capacitors To the opposite network phases.
2. The reactive power compensation system according to claim 1, characterized in that the capacitance of the capacitor batteries of the devices is selected of a different value.
print version
Published on February 15, 2007
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