SU993385A1

SU993385A1 - System for automatic regulating voltage and compensating for reactive power in distribution network

Info

Publication number: SU993385A1
Application number: SU813259102A
Authority: SU
Inventors: Всеволод Григорьевич Пекелис
Priority date: 1981-03-09
Filing date: 1981-03-09
Publication date: 1983-01-30

Description

Изобретение относитс к электроэнергетике и может быть использовано в распределительных электрических сет х напр жени 10-35-110 кВ.The invention relates to power engineering and can be used in distribution electrical networks with a voltage of 10-35-110 kV.

Известно, что ОСНОВШЛ4 средством ресулировани напр жени в распределительных сет х вл ютс трансформаторы с РПН, (регулированием под рузкой),устанавливаемые на распределительных подстанци х и используемые в режиме автоматического регулировани f .It is known that a SNECV4 means for voltage regulation in distribution networks are transformers with an on-load tap-changer, (regulation under load), installed at distribution substations and used in automatic control mode f.

Основным недостатком данного средства вл етс относительно низка надежность устройств РПН электромеханического исполнени .The main disadvantage of this tool is the relatively low reliability of electromechanical on-load tap-changers.

Нар ду с регулируемыми трансформаторами дл регулировани напр жени в распределительных сет х могут использоватьс шунтовые конденсаторные батареи, автоматически управл емые по отклонению напр жени с коррекцией по току нагрузки 23.Along with adjustable transformers, shunt capacitor banks can be used to control the voltage in distribution networks, which are automatically controlled by voltage deviation with load current correction 23.

Однако при таком использовании конденсаторных батарей их эффективность как средства ксмипенсации реак- тивной нагрузки резко снижаетс .However, with this use of capacitor batteries, their effectiveness as a means of compensating for reactive load decreases sharply.

При регулировании конденсаторных установок по услови м достижени наиболее экономичного режима сетиWhen regulating condenser installations according to the conditions of achieving the most economical mode of the network

регулирование напр жени должно осуществл тьс трансформаторами с РПН или вольтодобавочными автотрансформаторами .Voltage regulation should be carried out with transformers with an on-load tap-changer or booster transformers.

Наиболее близкой к предлагаемой вл етс система автоматического регулировани напр жени и компенсации реактивной мощности в распределительной сети, состо ща из трансфОЕ мато10 ра с РПН, подключенного к шинам питани , блока автс 1атического управлени , РПН, подключенного к шинному трансФорматору напр жени и трансформатору тока силового трансформатора и шунтр15 вых конденсаторных батарей, установленных в распределительной сети 3.Closest to the proposed system is an automatic voltage regulation and reactive power compensation in the distribution network, consisting of a transformer motherboard with an on-load tap-changer, connected to the power buses, an automatic control unit, an on-load tap-changer, connected to the bus voltage transformer and the current transformer transformer and shuntr15 out capacitor banks installed in the distribution network 3.

Недостатком известной системы вл етс относительно низка надежность устройства РПН электромеханического A disadvantage of the known system is the relatively low reliability of an electromechanical on-load tap-changer.

20 исполнени , работаючщх в режиме автбматического регулировани напр жени , и относительно низкое качество регулировани из-за ступенчатого изменени коэффициента трансформации 20 versions, operating in automatic voltage regulation mode, and relatively low control quality due to a step change in the transformation ratio.

25 силового трансформатора.25 power transformer.

Claims

The purpose of the invention is to simplify and improve the reliability of the operation of the on-load tap-changer and the quality of control of the yarn 30. This goal is achieved by the fact that the system is equipped with a shunt controlled reactor with an automatic control current controller and two relay elements, the reactor is connected to supply power, an automatic control current controller is connected to the bus voltage transformer and a current transformer, and the contacts of the relay elements are on to the output circuit of the RPN automatic control unit. The drawing shows a functional diagram of the proposed system. The system consists of a transformer 1 with PnHj. electric drive 2 of the on-load tap-changer, unit 3. automatic control of the on-load tap-changer (BAURN) with two outputs of the shunt controlled reactor 4, automatic regulator 5 of the control current, bus transformer b voltage, transformer 7 current in the power transformer circuit, relay elements 8 and 9, fixors, respectively, the minimum and maximum values of the current of the capacitor and capacitor batteries 10. The system works as follows. In case of any deviations of the voltage on the tires from a given installation, caused by a change in the load of the distribution network or the voltage in the supply network, the automatic regulator 5, operating without a dead zone, changes the control current of the reactor so as to eliminate the voltage deviation on. tires. At the same time, the on-load tap-changer does not work, since the output circuits of the automatic block controlling this device are open contacts of relay elements 8 and 9. When the reactor control current reaches the minimum or maximum values, relay elements of 8 and 9, respectively, operate. x BAURPN output (automatic control unit for control under load). The operation of any of these elements occurs when the adjustment range of the reactor in the appropriate direction is exhausted. If the voltage deviation on the tires exceeds the dead zone of the BAURPN, the latter closes its output contact, and the response of the transformer is switched. After that, the adjustment range of the reactor is restored and it brings the voltage to the desired setting. When the reactor control current changes within the adjustment range of the output circuit, the BAURPN is open. Thus, joint coordinated voltage regulation of shunt controlled reactor and transformer with on-load tap-changer is carried out; reactor - continuous inside the dead zone of the BAURPN transformer - discrete (stepwise). The proposed system is an optimal combination of contact and contactless means of regulation. voltages at which ojfni and others are used most rationally: contact means for coarse step regulation in a wide range, and contactless means for smooth regulation, but in a narrow range. At the same time, both of them are relatively cheap, easy to operate and are used with high efficiency. Claims An automatic voltage regulation and reactive power compensation system in a distribution network, comprising a load-controlled transformer connected to the power buses, an automatic load control unit connected to the bus voltage transformer and a current transformer of the power transformer, and unregulated capacitor banks, characterized in that, in order to simplify and improve the reliability of the control device under load and quality It has a shunt controlled reactor with an automatic control current controller and two relay elements, the reactor is connected to the power buses, an automatic control current controller is connected to the bus voltage transformer and a current transformer, and the contacts of the relay elements are included in control circuit output circuit of the automatic control unit under load. Sources of information taken into account in the examination 1. Barkan Ya.D. Automation of voltage regulation in distribution networks. M., Energie, 1971.

2. Barkan Ya.D. Automatic control of the capacitor battery mode, M., Energie, 1978.

3. Temporary guidelines for voltage regulation in electrical networks. M., BTI ORGRES, 1956.