RU2699012C1 - Three-phase high-voltage frequency converter - Google Patents

Three-phase high-voltage frequency converter Download PDF

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Publication number
RU2699012C1
RU2699012C1 RU2018141423A RU2018141423A RU2699012C1 RU 2699012 C1 RU2699012 C1 RU 2699012C1 RU 2018141423 A RU2018141423 A RU 2018141423A RU 2018141423 A RU2018141423 A RU 2018141423A RU 2699012 C1 RU2699012 C1 RU 2699012C1
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Russia
Prior art keywords
phase
converter
circuit
blocks
winding
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RU2018141423A
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Russian (ru)
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Илья Николаевич Джус
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Илья Николаевич Джус
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    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
    • H02M5/00—Conversion of ac power input into ac power output, e.g. for change of voltage, for change of frequency, for change of number of phases
    • H02M5/40—Conversion of ac power input into ac power output, e.g. for change of voltage, for change of frequency, for change of number of phases with intermediate conversion into dc
    • H02M5/42—Conversion of ac power input into ac power output, e.g. for change of voltage, for change of frequency, for change of number of phases with intermediate conversion into dc by static converters
    • H02M5/44—Conversion of ac power input into ac power output, e.g. for change of voltage, for change of frequency, for change of number of phases with intermediate conversion into dc by static converters using discharge tubes or semiconductor devices to convert the intermediate dc into ac
    • H02M5/443—Conversion of ac power input into ac power output, e.g. for change of voltage, for change of frequency, for change of number of phases with intermediate conversion into dc by static converters using discharge tubes or semiconductor devices to convert the intermediate dc into ac using devices of a thyratron or thyristor type requiring extinguishing means
    • H02M5/45—Conversion of ac power input into ac power output, e.g. for change of voltage, for change of frequency, for change of number of phases with intermediate conversion into dc by static converters using discharge tubes or semiconductor devices to convert the intermediate dc into ac using devices of a thyratron or thyristor type requiring extinguishing means using semiconductor devices only
    • H02M5/451—Conversion of ac power input into ac power output, e.g. for change of voltage, for change of frequency, for change of number of phases with intermediate conversion into dc by static converters using discharge tubes or semiconductor devices to convert the intermediate dc into ac using devices of a thyratron or thyristor type requiring extinguishing means using semiconductor devices only with automatic control of output voltage or frequency
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
    • H02M5/00—Conversion of ac power input into ac power output, e.g. for change of voltage, for change of frequency, for change of number of phases
    • H02M5/40—Conversion of ac power input into ac power output, e.g. for change of voltage, for change of frequency, for change of number of phases with intermediate conversion into dc
    • H02M5/42—Conversion of ac power input into ac power output, e.g. for change of voltage, for change of frequency, for change of number of phases with intermediate conversion into dc by static converters
    • H02M5/44—Conversion of ac power input into ac power output, e.g. for change of voltage, for change of frequency, for change of number of phases with intermediate conversion into dc by static converters using discharge tubes or semiconductor devices to convert the intermediate dc into ac
    • H02M5/453—Conversion of ac power input into ac power output, e.g. for change of voltage, for change of frequency, for change of number of phases with intermediate conversion into dc by static converters using discharge tubes or semiconductor devices to convert the intermediate dc into ac using devices of a triode or transistor type requiring continuous application of a control signal
    • H02M5/458—Conversion of ac power input into ac power output, e.g. for change of voltage, for change of frequency, for change of number of phases with intermediate conversion into dc by static converters using discharge tubes or semiconductor devices to convert the intermediate dc into ac using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02P—CONTROL OR REGULATION OF ELECTRIC MOTORS, ELECTRIC GENERATORS OR DYNAMO-ELECTRIC CONVERTERS; CONTROLLING TRANSFORMERS, REACTORS OR CHOKE COILS
    • H02P27/00—Arrangements or methods for the control of AC motors characterised by the kind of supply voltage
    • H02P27/04—Arrangements or methods for the control of AC motors characterised by the kind of supply voltage using variable-frequency supply voltage, e.g. inverter or converter supply voltage
    • H02P27/06—Arrangements or methods for the control of AC motors characterised by the kind of supply voltage using variable-frequency supply voltage, e.g. inverter or converter supply voltage using dc to ac converters or inverters
    • H02P27/08—Arrangements or methods for the control of AC motors characterised by the kind of supply voltage using variable-frequency supply voltage, e.g. inverter or converter supply voltage using dc to ac converters or inverters with pulse width modulation

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  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Control Of Electrical Variables (AREA)

Abstract

FIELD: electrical engineering.
SUBSTANCE: invention relates to electrical engineering and can be used in a powerful electric drive. Three-phase high-frequency frequency converter comprises series-connected converter units (9), which are supplied from three-phase groups of gate windings of transformers (2, 3, 4), and outputs of group of blocks (9) are connected to motor (12); network winding (7) of transformer (1) is connected to high-voltage switch (8), and winding (6) of pre-charge through current-limiting capacitors (11) is connected to switch (7) of medium voltage network. A short-circuiter (10) is introduced into the converter, which provides short-circuit of capacitors to the star in operating mode, thus providing compensation of reactive power.
EFFECT: technical result is increase in the efficiency.
1 cl, 2 dwg

Description

Изобретение относится к электротехнике и может использоваться в мощном электроприводе. Широко известный преобразователь подобного типа /1/ содержит в каждой фазе последовательно соединенные преобразовательные блоки, которые соединены входами с трехфазными группами вентильных обмоток трансформатора, а выходы цепи трех групп блоков, соединены звездой. Имеется также специальный трансформатор предзаряда с токоограничивающим резистором. Недостаток такого устройства состоит в сложной схеме соединения.The invention relates to electrical engineering and can be used in a powerful electric drive. A well-known converter of this type / 1 / contains in each phase series-connected converter blocks, which are connected by inputs to three-phase groups of valve transformer windings, and the outputs of the circuit of three groups of blocks are connected by a star. There is also a special precharge transformer with a current limiting resistor. The disadvantage of this device is the complex connection scheme.

Наиболее близким по сути является трехфазный частотный преобразователь /2/ высокого напряжения, содержащий в каждой фазе последовательно соединенные преобразовательные блоки, которые соединены входами с трехфазными группами вентильных обмоток трансформатора, имеющими между собой фазовый сдвиг векторов напряжения, а выходы цепи трех групп блоков, соединены звездой и подключены к двигателю, сетевая обмотка трансформатора подключена к выключателю, а обмотка предзаряда через конденсатор подключена к выключателю сети среднего напряжения. Недостаток устройства состоит в относительно низком К.П.Д., обусловленном потреблением реактивной мощности из сети.The closest in essence is a three-phase frequency converter / 2 / high voltage, containing in each phase series-connected converter blocks that are connected by inputs to three-phase groups of transformer valve windings having a phase shift of voltage vectors, and the outputs of the circuit of three groups of blocks are connected by a star and connected to the motor, the transformer mains winding is connected to the circuit breaker, and the precharge winding through the capacitor is connected to the medium voltage main circuit breaker . The disadvantage of the device is the relatively low KPD due to the consumption of reactive power from the network.

Техническим результатом предложения является повышение К.П.Д.The technical result of the proposal is to increase K.D.

Технический результат достигается за счет того, что преобразователь снабжен короткозамыкателем среднего напряжения, подключенным к общей точке конденсаторов и обмоток предзаряда.The technical result is achieved due to the fact that the converter is equipped with a short-circuit medium voltage connected to a common point of the capacitors and precharge windings.

Дополнительно последовательно с короткозамыкателем включена батарея конденсаторов.Additionally, a capacitor bank is connected in series with the short circuit.

На чертеже фиг. 1 и 2 представлена схема преобразователя. Обозначено: 1 - первичная обмотка трансформатора, 2, 3, 4 - группы трехфазных вторичных, вентильных обмоток трансформатора, 5 -- его сеть (высокая), 6 - обмотка предзаряда, 7 - выключатель среднего напряжения, 8 - высоковольтный выключатель, 9 - преобразовательные блоки (см. схема /2/), 10 - короткозамыкатель, 11 - токоограничивающие конденсаторы. По выходу цепи блоков 9 составляют выходные фазы (А, В, С), соединенные в звезду и подключенные к нагрузке 12 (двигателю). На фиг. 2 последовательно с короткозамыкателем 10 установлена батарея шунтовых конденсаторов 13.In the drawing of FIG. 1 and 2 shows a converter circuit. Designated: 1 - primary winding of the transformer, 2, 3, 4 - groups of three-phase secondary, valve windings of the transformer, 5 - its network (high), 6 - precharge winding, 7 - medium voltage switch, 8 - high voltage switch, 9 - converter blocks (see diagram / 2 /), 10 - short-circuit, 11 - current-limiting capacitors. By the output of the circuit of blocks 9 are the output phases (A, B, C), connected to a star and connected to the load 12 (motor). In FIG. 2, a shunt capacitor bank 13 is installed in series with the short circuit 10.

Частотный преобразователь работает следующим образом. Переменное высокое напряжение сети понижается до более низкого обмотками 2-5 (уровень 1кВ), выпрямляется и преобразуется в переменное напряжение другой частоты и величины. Фазовый сдвиг напряжений обмоток 2-4 трансформатора обеспечивает в первичной обмотке 1 многоступенчатый ток по форме близкий к синусоидальному. К двигателю 12 подводится суммарное напряжение блоков 9, которое регулируется по частоте и амплитуде методом широтно-импульсной модуляции. Начальный запуск преобразователя производят в таком порядке. Выключатель 8 отключен, короткозамыкатель 10 также отключен, включается выключатель 7 среднего напряжения, чем в обмотки 6 предзаряда подается напряжение порядка 0,4 кВ. Это напряжение трансформируется в вентильные обмотки 2, 3, 4 и вызывает заряд фильтровых конденсаторов, входящих в состав преобразовательных блоков 9. Происходит предварительный заряд этих конденсаторов (блоков 9). Ток заряда ограничивают конденсаторы 11. После окончания предзаряда, выключатель 7 размыкается и включаются выключатель 8 и короткозамыкатель 10. Преобразователь находится в рабочем состоянии. При этом через конденсаторы 11 протекает реактивный ток, компенсирующий (частично) реактивный ток, потребляемый блоками 9. Таким образом, происходит снижение потребления реактивной мощности из сети. Это повышает К.П.Д. установки, ибо снижаются перетоки реактивной мощности в сети. Батарея 13 на фиг. 2 используется для уменьшения тока в статическом режиме.The frequency converter operates as follows. The alternating high voltage of the network is reduced to lower windings 2-5 (1kV level), rectified and converted into alternating voltage of a different frequency and magnitude. The phase shift of the voltage of the transformer windings 2-4 provides in the primary winding 1 a multistage current in a shape close to sinusoidal. The total voltage of the blocks 9 is supplied to the motor 12, which is regulated in frequency and amplitude by the method of pulse-width modulation. The initial start-up of the converter is performed in this order. The switch 8 is turned off, the short circuit 10 is also turned off, the medium voltage switch 7 is turned on, and a voltage of about 0.4 kV is supplied to the pre-charge windings 6. This voltage is transformed into the valve windings 2, 3, 4 and causes the charge of the filter capacitors included in the converter blocks 9. There is a preliminary charge of these capacitors (blocks 9). The charge current is limited by the capacitors 11. After the pre-charge is completed, the switch 7 opens and the switch 8 and the short circuit 10 are turned on. The converter is in working condition. In this case, a reactive current flows through the capacitors 11, compensating (partially) for the reactive current consumed by the units 9. Thus, there is a decrease in the consumption of reactive power from the network. It boosts KPD installations, because the flow of reactive power in the network is reduced. The battery 13 in FIG. 2 is used to reduce current in static mode.

Источники информации:Information sources:

1. Патент РФ на полезную модель №115132.1. RF patent for utility model No. 115132.

2. Патент РФ на изобретение №2364016, кл. H02P 9/00, H02P 1/00.2. RF patent for the invention No. 2364016, class. H02P 9/00, H02P 1/00.

Claims (2)

1. Трехфазный частотный преобразователь высокого напряжения, содержащий в каждой фазе последовательно соединенные преобразовательные блоки, которые соединены входами с трехфазными группами вентильных обмоток трансформатора, имеющими между собой фазовый сдвиг векторов напряжения, а выходы цепи трех групп блоков соединены звездой и подключены к двигателю, сетевая обмотка трансформатора подключена к выключателю, а обмотка предзаряда через конденсатор подключена к выключателю сети среднего напряжения, отличающийся тем, что он снабжен короткозамыкателем, подключенным к общей точке конденсаторов и обмоток предзаряда.1. A three-phase frequency converter of high voltage, containing in each phase series-connected converter blocks, which are connected by inputs to three-phase groups of transformer valve windings having a phase shift of voltage vectors, and the outputs of the circuit of three groups of blocks are connected by a star and connected to the motor, network winding the transformer is connected to the switch, and the precharge winding through the capacitor is connected to the medium voltage circuit breaker, characterized in that it is equipped with a short-circuit switch connected to a common point on the capacitors and precharge windings. 2. Трехфазный частотный преобразователь высокого напряжения по п. 1, отличающийся тем, что последовательно с короткозамыкателем включена батарея конденсаторов.2. A three-phase high-frequency frequency converter according to claim 1, characterized in that a capacitor bank is connected in series with the short circuit.
RU2018141423A 2018-11-26 2018-11-26 Three-phase high-voltage frequency converter RU2699012C1 (en)

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Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2002045250A1 (en) * 2000-11-30 2002-06-06 Mitsubishi Denki Kabushiki Kaisha Power conversion device
CN101243590A (en) * 2005-08-18 2008-08-13 西门子能量及自动化公司 System and method for limiting AC inrush current
RU115132U1 (en) * 2011-11-25 2012-04-20 Открытое Акционерное Общество Холдинговая Компания "Электрозавод" (Оао "Электрозавод") AUTONOMOUS INVERTER VOLTAGE CONVERTER
US8223515B2 (en) * 2009-02-26 2012-07-17 TECO—Westinghouse Motor Company Pre-charging an inverter using an auxiliary winding
RU144730U1 (en) * 2014-03-18 2014-08-27 Открытое акционерное общество "Акционерная компания по транспорту нефти "Транснефть" (ОАО "АК "Транснефть") HIGH VOLTAGE FREQUENCY REGULATED ELECTRIC DRIVE
JP6020261B2 (en) * 2012-03-09 2016-11-02 ミツミ電機株式会社 Semiconductor sensor device and electronic device using the same
US9712070B2 (en) * 2013-06-04 2017-07-18 Toshiba Mitsubishi-Electric Industrial Systems Corporation Power conversion device

Patent Citations (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2002045250A1 (en) * 2000-11-30 2002-06-06 Mitsubishi Denki Kabushiki Kaisha Power conversion device
DE60027333T2 (en) * 2000-11-30 2007-01-18 Mitsubishi Denki K.K. POWER CONVERTER DEVICE
CN101243590A (en) * 2005-08-18 2008-08-13 西门子能量及自动化公司 System and method for limiting AC inrush current
RU2364016C1 (en) * 2005-08-18 2009-08-10 Сименс Энерджи Энд Отомейшн, Инк. System and method of limiting alternating inrush current
US8223515B2 (en) * 2009-02-26 2012-07-17 TECO—Westinghouse Motor Company Pre-charging an inverter using an auxiliary winding
RU115132U1 (en) * 2011-11-25 2012-04-20 Открытое Акционерное Общество Холдинговая Компания "Электрозавод" (Оао "Электрозавод") AUTONOMOUS INVERTER VOLTAGE CONVERTER
JP6020261B2 (en) * 2012-03-09 2016-11-02 ミツミ電機株式会社 Semiconductor sensor device and electronic device using the same
US9712070B2 (en) * 2013-06-04 2017-07-18 Toshiba Mitsubishi-Electric Industrial Systems Corporation Power conversion device
RU144730U1 (en) * 2014-03-18 2014-08-27 Открытое акционерное общество "Акционерная компания по транспорту нефти "Транснефть" (ОАО "АК "Транснефть") HIGH VOLTAGE FREQUENCY REGULATED ELECTRIC DRIVE

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