RU2505903C1 - Intergrated apparatus for compensation of reactive power and melting ice cover (version) - Google Patents

Intergrated apparatus for compensation of reactive power and melting ice cover (version) Download PDF

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Publication number
RU2505903C1
RU2505903C1 RU2012124470/07A RU2012124470A RU2505903C1 RU 2505903 C1 RU2505903 C1 RU 2505903C1 RU 2012124470/07 A RU2012124470/07 A RU 2012124470/07A RU 2012124470 A RU2012124470 A RU 2012124470A RU 2505903 C1 RU2505903 C1 RU 2505903C1
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Russia
Prior art keywords
melting
mode
ice
reactive power
pole switch
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RU2012124470/07A
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Russian (ru)
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RU2012124470A (en
Inventor
Юрий Павлович Сташинов
Владислав Викторович Конопелько
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Открытое Акционерное Общество "Федеральная Сетевая Компания Единой Энергетической Системы" (Оао "Фск Еэс")
Закрытое акционерное общество "ЭнергоПроект" (ЗАО "ЭнергоПроект")
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Priority to RU2012124470/07A priority Critical patent/RU2505903C1/en
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    • YGENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02EREDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E40/00Technologies for an efficient electrical power generation, transmission or distribution
    • Y02E40/30Reactive power compensation

Abstract

FIELD: electricity.
SUBSTANCE: apparatus has a three-phase bridge converter on fully controlled semiconductor rectifiers, which are shunted by anti-parallel connected diodes, a capacitor bank at the direct current side, a first three-pole switch and two series-connected three-phase chokes, one of which is connected in parallel to a second three-pole switch, at the alternating current side. According to the first version, the capacitor bank in reactive power compensation mode is connected by contacts of a third three-pole switch, which are open in ice melting mode, to emitter (collector) leads of rectifiers of the converter which in that mode are connected through a fourth three-pole switch to wires of the overhead power line for controlled melting of ice with alternating current. According to the second version, the capacitor bank in reactive power compensation mode is connected by contacts of the third and fourth three-pole switches, which are open in ice melting mode, to emitter and collector leads of rectifiers of the converter which in that mode are connected through fifth and sixth three-pole switches to wires of two overhead power lines for simultaneous controlled melting of ice thereon with alternating current.
EFFECT: shorter duration of the melting process with simultaneous reduction of the amount of additional switching equipment.
2 cl, 4 dwg

Description

Technical field

The invention relates to the field of electrical engineering and can be used in electrical substations.

State of the art

With the development of power semiconductor technology in the electric power industry, static devices for reactive power compensation (STATCOMs) made on the basis of voltage converters on fully controlled power electronics devices shunted by reverse diodes (see, for example, Kochkin V.I., Nechaev O.P. Application of static reactive power compensators in electric networks of power systems and enterprises. - M.: Publishing House NTs ENAS, 2000). Due to their high speed, as well as the use of pulse width modulation (PWM), STATCOMs can effectively maintain the required quality indicators of electricity in power supply systems.

Another important technical task aimed at improving the reliability of power supply to consumers is the regulated melting of ice on overhead power lines (VL). To solve it, a variety of converters are used, also made on semiconductor power key elements. However, they are used for their intended purpose for a relatively short time, only during periods of icing. In this regard, it is advisable to combine the functions of reactive power compensation and ice melting in one device to save capital costs in connection with a reduction in the total amount of equipment installed at the substation.

Known combined installations for reactive power compensation and ice melting (KRM-PG), made on the basis of a three-phase bridge converter (two or three-level) on fully controllable power semiconductor devices - IGBT or lockable thyristors (see US Pat. No. 6433520; publ. 13.08 .2002; Pat RU No. 2376692; claimed. 09.06.2008; publ. 12/20/2009. Bull. No. 35).

SUMMARY OF THE INVENTION

The converter contains three arms on series-connected fully controllable semiconductor gates, shunted by on-board diodes. When implementing STATCOM, an AC converter through the first three-pole switch and a reactor group of two three-phase inductors is connected to a three-phase winding of the power transformer, and a capacitor bank acting as a constant voltage source is connected to the DC output of the converter. In parallel with one of the three-phase reactors, a second three-pole switch is connected, the contacts of which are open when the device is in reactive power compensation mode.

When melting ice, the converter is transferred from compensation mode to controlled rectifier mode, with an output connected via a two-pole switch or two single-pole VL wires switches, on which ice is smelted with direct current. The contacts of the second three-pole switch are closed in this mode.

The advantage of using direct current is the ability to melt ice on long lines. However, with the recommended melting schemes: “snake”, “wire - two wires”, “wire-wire” (see Guidelines for melting ice with direct current. Part 2. - M .: MU 34-70-028-82, 1983) requires the use of additional high-voltage switches placed at both ends of the line, with their periodic switching during the melting process, which significantly complicates the organization of ice melting, increases the melting time, and requires additional capital costs for external switching equipment.

The technical effect of the invention is to simplify the organization and reduce the duration of the ice melting process through the combined installation of KRM-PG with a simultaneous reduction in the number of additional switching equipment.

To achieve this effect, with the help of additional switches, AC voltage regulators are formed from semiconductor switches of the converter for controlled melting of ice on overhead lines with alternating current. In this case, ice smelting is carried out simultaneously on three wires closed at the opposite end of the line.

The implementation of the invention in view of its development

The essence of the invention is illustrated by drawings, where Figs. 1-3 show schematic diagrams of variants of the proposed KRM-PG installation, and Fig. 4 shows graphs of the voltage changes at the terminals of the overhead line wires for melting ice when adjusting the effective value of the melting current by changing the duration of the flow periods current and currentless pauses.

The proposed combined installation for reactive power compensation and ice melting is made on the basis of a bridge converter containing three arms 1-3 on series-connected fully controllable semiconductor switches - IGBT transistors, shunted by on-board diodes. On the AC side, the converter is connected to the three phases A, B, C of the secondary winding of the transformer or the AC network through the first three-pole switch 4 and three-phase inductors 5, 6, in parallel with one of which the second three-pole switch 7. is connected. A capacitor is connected to the DC output of the converter battery 8.

According to the first embodiment of the installation (Figs. 1 and 2), in the reactive power compensation mode, the capacitor battery 8 is connected by the contacts of the third three-pole switch 9, open in the ice melting mode, with the emitter (collector) terminals of the converter valves, which in this mode by the fourth three-pole switch 10 connected to the wires of the overhead line for controlled melting of ice on them with alternating current.

According to the second variant (Fig. 3), in the reactive power compensation mode, the capacitor bank 8 is connected by the contacts of the third 9 and fourth 11 three-pole switches, open in the ice melting mode, with the emitter and collector terminals of the converter valves, which in this mode by means of the fifth 10 and sixth 12 three-pole circuit breakers are connected to the wires of the first and second overhead lines for simultaneous controlled melting of ice on them with alternating current.

Installation works as follows.

In reactive power compensation mode, when the angle of control of semiconductor switches α is slightly less than 180 °, the converter consumes active power from the AC network to cover losses in the converter elements in order to maintain voltage at the terminals of the capacitor bank, which in this mode performs the functions of a DC power source . Moreover, on the AC side, the converter forms an alternating three-phase voltage U P , the first harmonic of which is shifted with respect to the phase voltages of the AC source by an angle β = 180 ° -α. If the amplitude of the first harmonic of the voltage U P exceeds the amplitude of the alternating voltage of the alternating current source, the converter generates reactive power into the network, if on the contrary, the converter loads the network with reactive power. By changing the high-frequency PWM coefficient, the amplitude of the first harmonic of the voltage U P is regulated, and therefore, the magnitude and direction of transmission of reactive power through the converter.

In the STATCOM mode, the contacts of the three-pole switch 7 are open.

For melting ice with alternating current in a combined installation according to the first embodiment, the contacts of the three-pole switch 9 are opened, and the emitter (collector) terminals of the converter valves with the contacts of the three-pole switch 10 are connected to the overhead wires closed at the opposite end of the line.

According to the second variant of the combined KRM-PG device in the ice melting mode by alternating current, the contacts of switches 9, 11 are opened, and by means of switches 10, 12, the wires VL1 and VL2 are connected to the semiconductor switches of the converter, simultaneously melting the ice on two air lines.

The required melting current can be set and, if necessary, automatically maintained by changing the modulation coefficient of the high-frequency PWM or by changing the semiconductor switch state control signals for the durations of the current flow periods T1 and non-current breaks T2, as shown in Fig. 4.

To more efficiently use the power of the converter in the ice melting mode, a three-phase reactor 6 is shunted by the contacts of a three-pole switch 7.

In contrast to direct ice melting, controlled alternating current melting is carried out simultaneously on all overhead lines and requires only a short circuit at the opposite end of the line, which greatly simplifies the organization and reduction of the melting process while reducing the number of additional switching equipment.

Claims (2)

1. A combined installation for reactive power compensation and ice melting, comprising a three-phase bridge converter on fully controllable semiconductor valves, shunted with on-board diodes, a DC capacitor bank, a first three-pole switch and two three-phase reactors connected in series, one of which is connected to the second three-pole switch, on the AC side, characterized in that in reactive power compensation mode a capacitor bank connected to the contacts of the third three-pole circuit breaker in the melting ice-open mode, the emitter (collector) terminals converter valves, which in this mode by the fourth three-pole switch connected to both air lines for the controlled melting of ice on them alternating current.
2. Combined installation for reactive power compensation and ice melting, comprising a three-phase bridge converter on fully controllable semiconductor valves, shunted with on-board diodes, a DC capacitor bank, a first three-pole switch and two three-phase chokes connected in series, one of which is connected to the second three-pole switch, on the AC side, characterized in that in reactive power compensation mode the capacitor bank is connected by the contacts of the third and fourth three-pole switches, open in ice melting mode, with the emitter and collector terminals of the converter valves, which in this mode are connected by the fifth and sixth three-pole switches, respectively, to the wires of the first and second overhead lines for simultaneous controlled ice melting on them by alternating current.
RU2012124470/07A 2012-06-14 2012-06-14 Intergrated apparatus for compensation of reactive power and melting ice cover (version) RU2505903C1 (en)

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Cited By (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN103915808A (en) * 2014-03-07 2014-07-09 南方电网科学研究院有限责任公司 Direct current deicing device based on voltage source type converter and control method thereof
CN104701796A (en) * 2015-03-27 2015-06-10 国家电网公司 Intensive type DC de-icing device topology structure
CN104810801A (en) * 2015-04-28 2015-07-29 中国南方电网有限责任公司超高压输电公司检修试验中心 Tubular bus current differential protection method applicable to direct-current ice melting system rectifying device
CN106684795A (en) * 2015-11-10 2017-05-17 云南电网有限责任公司昭通供电局 Direct current deicing apparatus based on three-phase bridge type full-control structure
RU2621068C1 (en) * 2016-07-06 2017-05-31 Акционерное общество "Научно-технический центр Федеральной сетевой компании Единой энергетической системы" Reactive power compensation and ice-melting combination device on the basis of the driven shunt reactor transformer
CN107181263A (en) * 2016-12-12 2017-09-19 南京南瑞继保电气有限公司 The DC ice melting of zero load test and SVC major loop and method to set up can be achieved
CN109193536A (en) * 2018-09-21 2019-01-11 国网湖南省电力有限公司 The intensive high-power reactive compensation system of DC de-icing device
RU2729039C1 (en) * 2019-11-19 2020-08-04 Федеральное государственное бюджетное образовательное учреждение высшего образования "Казанский государственный энергетический университет" (ФГБОУ ВО "КГЭУ") Combined ice melting system and load curve smoothing using energy accumulators based on storage batteries and high-power supercapacitors contained in an autonomous power plant
RU2729200C1 (en) * 2019-11-20 2020-08-05 Федеральное государственное бюджетное образовательное учреждение высшего образования "Казанский государственный энергетический университет" (ФГБОУ ВО "КГЭУ") Combined glaze ice melting system and load curve smoothing using energy accumulators based on storage batteries and high-power supercapacitors contained in autonomous power plant assembly

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6433520B1 (en) * 2001-05-29 2002-08-13 Siemens Power Transmission & Distribution Inc Dc power regulator incorporating high power ac to dc converter with controllable dc voltage and method of use
RU2316867C1 (en) * 2006-08-11 2008-02-10 Открытое Акционерное Общество "Федеральная Сетевая Компания Единой Энергетической Системы" (Оао "Фск Еэс") Combinatorial ice melting and reactive power correcting installation
RU2376692C1 (en) * 2008-06-09 2009-12-20 Открытое акционерное общество "Научно-исследовательский институт по передаче электроэнергии постоянным током высокого напряжения" (ОАО "НИИПТ") Combined plant for glase ice and reactive power compensation

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6433520B1 (en) * 2001-05-29 2002-08-13 Siemens Power Transmission & Distribution Inc Dc power regulator incorporating high power ac to dc converter with controllable dc voltage and method of use
RU2316867C1 (en) * 2006-08-11 2008-02-10 Открытое Акционерное Общество "Федеральная Сетевая Компания Единой Энергетической Системы" (Оао "Фск Еэс") Combinatorial ice melting and reactive power correcting installation
RU2376692C1 (en) * 2008-06-09 2009-12-20 Открытое акционерное общество "Научно-исследовательский институт по передаче электроэнергии постоянным током высокого напряжения" (ОАО "НИИПТ") Combined plant for glase ice and reactive power compensation

Cited By (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN103915808A (en) * 2014-03-07 2014-07-09 南方电网科学研究院有限责任公司 Direct current deicing device based on voltage source type converter and control method thereof
CN104701796A (en) * 2015-03-27 2015-06-10 国家电网公司 Intensive type DC de-icing device topology structure
CN104701796B (en) * 2015-03-27 2016-04-27 国家电网公司 A kind of intensive DC de-icing device topological structure
CN104810801A (en) * 2015-04-28 2015-07-29 中国南方电网有限责任公司超高压输电公司检修试验中心 Tubular bus current differential protection method applicable to direct-current ice melting system rectifying device
CN104810801B (en) * 2015-04-28 2017-07-11 中国南方电网有限责任公司超高压输电公司检修试验中心 Suitable for the pipe bus current differential protecting method of direct current ice melting system fairing
CN106684795A (en) * 2015-11-10 2017-05-17 云南电网有限责任公司昭通供电局 Direct current deicing apparatus based on three-phase bridge type full-control structure
RU2621068C1 (en) * 2016-07-06 2017-05-31 Акционерное общество "Научно-технический центр Федеральной сетевой компании Единой энергетической системы" Reactive power compensation and ice-melting combination device on the basis of the driven shunt reactor transformer
CN107181263A (en) * 2016-12-12 2017-09-19 南京南瑞继保电气有限公司 The DC ice melting of zero load test and SVC major loop and method to set up can be achieved
CN109193536A (en) * 2018-09-21 2019-01-11 国网湖南省电力有限公司 The intensive high-power reactive compensation system of DC de-icing device
RU2729039C1 (en) * 2019-11-19 2020-08-04 Федеральное государственное бюджетное образовательное учреждение высшего образования "Казанский государственный энергетический университет" (ФГБОУ ВО "КГЭУ") Combined ice melting system and load curve smoothing using energy accumulators based on storage batteries and high-power supercapacitors contained in an autonomous power plant
RU2729200C1 (en) * 2019-11-20 2020-08-05 Федеральное государственное бюджетное образовательное учреждение высшего образования "Казанский государственный энергетический университет" (ФГБОУ ВО "КГЭУ") Combined glaze ice melting system and load curve smoothing using energy accumulators based on storage batteries and high-power supercapacitors contained in autonomous power plant assembly

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