SU773825A1

SU773825A1 - Regulating reactive power source

Info

Publication number: SU773825A1
Application number: SU792739349A
Authority: SU
Inventors: Николай Ильич Джус
Original assignee: Московское Отделение Научно-Исследовательского Института Постоянного Тока
Priority date: 1979-03-26
Filing date: 1979-03-26
Publication date: 1980-10-23

Description

(54) РЕГУЛИРУЕМЫЙ ИСТОЧНИК РЕАКТИВНОЙ МОЩНОСТИ(54) ADJUSTABLE SOURCE OF REACTIVE POWER

II

Изобретение относитс к электротехнике и может быть использовано в качестве устройства компенсации реактивной мощности в сет х переменного тока.The invention relates to electrical engineering and can be used as a device for compensating reactive power in AC networks.

Известны источники реактивной мощности (ИРМ), состо щие из трехдиодных батарей , подключенных к сети переменного тока через управл емые вентили .There are known sources of reactive power (IRM), consisting of three-diode batteries connected to the AC network through controlled gates.

Недостатком таких схем вл етс больша величина бросков тока при отпирании вентилей, дл ликвидации указанных бросков параллельно конденсаторам необходимо включить управл емые внешние источники напр жени , что сильно удорожает и усложн ет , схему, снижает ее надежность.The drawback of such circuits is the large amount of current surges when the valves are unlocked. To eliminate these surges, parallel to the capacitors it is necessary to turn on controlled external voltage sources, which greatly increases the cost and complexity of the circuit and reduces its reliability.

Известен также регулируемый источник реактивной мощности трехфазной сети перемен ного тока, содержащий вентильный преобразователь посто нного тока, подключаемый к сети через конденсаторы, включенные в каждой фазе, и замкнутый на реактор на стороне посто нного тока 2.Also known is a controlled reactive power source of a three-phase AC network, which contains a DC converter that is connected to the network through capacitors connected in each phase and closed to the reactor on the DC side 2.

Недостатки схемы - сложность силовой схемы и управлени и его низка надежность.The drawbacks of the circuit are the complexity of the power circuit and control and its low reliability.

Цель изобретени - повышение надежности путем упрощени управлени устройством .The purpose of the invention is to increase reliability by simplifying device control.

Цель достигаетс тем, что в регулируемый источник реактивной мощности трехфазной сети переменного тока, содержащий вентильный преобразователь посто нного тока , подключаемый к сети через конденсаторы , включенные в каждой фазе, и замкнутый на реактор на стороне посто нного тока, введены полностью управл емый ключ, например электронна лампа, и дополнительные конденсатор и реактор, защунтированный диодом, причем дополнительный реактор и полностью управл емый ключ соединены The goal is achieved by introducing a fully controllable key, for example, a regulated source of reactive power to a three-phase AC network containing a DC converter connected to the network through capacitors connected in each phase and closed to the reactor on the DC side. an electronic lamp, and an additional capacitor and a reactor, which is triggered by a diode, with the additional reactor and the fully controllable key connected

10 последовательно и включены в рассечку цепи посто нного тока преобразовател , а параллельно им подсоединен дополнительный конденсатор.10 in series and included in the dissection of the DC circuit of the converter, and in parallel with them an additional capacitor is connected.

На чертеже представлена схема устрой15 ства.The drawing shows a device diagram.

Claims

The capacitors 1 are connected to the network 2 by some pins, and the others to the input of the valve converter 3. On the DC side of the valve converter 20 additional 3 capacitor 4 and reactor 5, as well as reactor 6 and switch 7, which is a fully controlled valve ( dual operation thyristor, trans. “fl-- ff yirsg JV,;: 4-resistor, electronic lamp, thyristor with forced switching node). A diode 8 is connected in parallel with reactor 5. Key 7 operates in pulse-width modulation mode. When key 7 is turned off, the current of additional reactor 5 is closed through diode 8, which relieves voltage on the current key. An interruption in the current of network 2 (capacitors 1) does not cause overvoltages, since the valve converter 3 is bridged by capacitor 4. Reactor 6 allows current to flow from network 2 "o through additional capacitor 4 into the gaps when switch 7 is turned off. In the network, the voltage across the capacitor 4 increases in time. When key 7 is turned on, additional capacitor 4 is discharged through additional reactor 5 and key 7. The discharge current surges are limited by additional reactor 5. Thus, the use of only one controllable element, key 7, connected on the DC side jg of the converter 3 in the proposed scheme, it is possible to reject complex power circuits and control systems inherent in a known controlled reactive power source, to reduce current surges and overvoltage on capacitors 1, which is 25 volts the end result is a significant increase in S; reliability of regulated reactive power source. Claims An adjustable reactive power source of a three-phase AC network, containing a DC converter, connected to the network via capacitors connected in each phase, and closed to the DC-side reactor, which is designed to simplify and hone it , a fully controllable switch, such as an electronic lamp, and an additional capacitor and reactor, which is triggered by a diode, are inserted into it, with the additional reactor and the fully controlled switch connected Consequently, they are included in the cut} of the DC circuit of the converter, and an additional capacitor is connected in parallel with them. Sources of information taken into account during the examination 1. USSR Author's Certificate No. 230959, cl. H 02 J 3/18, 07/17/1963.

2. Venikov, VA and others. Static sources of reactive power in electrical grids. M., “Energie, 1975, p. 77, fig. 3-10.