SU907762A1

SU907762A1 - Current inverter starting device

Info

Publication number: SU907762A1
Application number: SU802943824A
Authority: SU
Inventors: Виталий Анатольевич Алфимов; Юрий Васильевич Никитенко
Original assignee: Научно-производственное объединение "ЭНЕРГИЯ"
Priority date: 1980-06-25
Filing date: 1980-06-25
Publication date: 1982-02-23

Description

1one

Изобретение относитс к преобразовательной технике, а именно к способам пуска автономных инверторов тока.The invention relates to a converter technique, and in particular to methods for starting autonomous current inverters.

Известен способ пуска инверторов тока, заключающийс в том, что на тиристоры инвертора подают импульсы управлени , а ток в звене посто нного тока постепенно увеличивают, увеличива питающее посто нное напр жение 1.A known method of starting the current inverters is that control inverters supply the thyristors of the inverter, and the current in the DC link gradually increases, increasing the supply voltage of constant voltage 1.

Однако при таком способе пуска на интервале пуска нагрузка питаетс пониженным напр жением, что не всегда допустимо.However, with this start-up method, in the start-up interval, the load is supplied with a reduced voltage, which is not always permissible.

Дл устранени этого недостатка при пуске используют отдельное пусковое устройство , позвол ющее увеличивать ток достаточно быстро.To eliminate this drawback, a separate starting device is used at start-up, which allows the current to be increased rather quickly.

Наиболее близким по технической сущности к изобретению вл етс способ пуска инвертора тока, содержащего тиристорный мост с конденсатором в диагонали переменного тока и сглаживающим дросселем в цепи посто нного тока моста, а также тиристорное пусковое устройство, включенное в диагональ посто нного тока моста , заключающийс в том, что замыкают цепь сглаживающего дроссел , увеличивают ток в дросселе до заданного значени и затем подают управл ющие импульсы на тиристоры моста 2.The closest in technical essence to the invention is a method for starting a current inverter containing a thyristor bridge with a capacitor in an AC diagonal and a smoothing choke in the DC circuit of the bridge, as well as a thyristor starting device included in the DC diagonal of the bridge, consisting of that close the smoothing throttle circuit, increase the current in the inductor to a predetermined value, and then apply control pulses to the thyristors of bridge 2.

Недостаток известного способа состоит в том, что в течение всего времени пуска ток дроссел протекает через пусковое 5 устройство.. Вследствие этого тиристорное пусковое устройство мощного инвертора тока должно быть рассчитано на номинальный ток дроссел , что приводит к увеличению его габаритов, усложнению устройства и снижению его КПД.The disadvantage of this method is that during the entire time of start-up, the current of the throttle flows through the starting device 5. As a result, the thyristor starting device of the powerful current inverter must be calculated on the nominal current of the throttle, which leads to an increase in its dimensions, complication of the device and decrease Efficiency

Цель изобретени - повыщение КПД и упрощение аппаратурной реализации инвертора путем уменьщени длительности интервала протекани тока через пусковое устройство.The purpose of the invention is to increase the efficiency and simplify the hardware implementation of the inverter by reducing the duration of the current flow interval through the starting device.

Claims

The goal is achieved by the fact that in the above-mentioned method of starting the current inverter with a thyristor starting device, consisting in closing the smoothing circuit, increasing the current 2Q in the inductor to a predetermined value and then sending control pulses to the thyristors of the bridge, shorting the smoothing circuit. produced by unlocking the thyristors of the bridge, after increasing the current of the chokes to a predetermined value, unlocking the thyristor of the starting device, locking the thyristors of the bridge, and controlling pulses to the thyristors of the bottom bridge t after reduction of their locking properties. The drawing shows a device that implements the proposed method. A smoothing choke 2 connected to thyristor bridge 3 is connected to power source 1. On the AC side, capacitors 4 are connected to the phase terminals of bridge 3 and a useful load is 5. Parallel to the thyristor bridge there is a thyristor starting device b consisting of thyristor 7, capacitor 8 and resistor 9. When the inverter starts up, all the thyristors of the bridge 3 are unlocked. The voltage at its output at this time is zero. In this case, the throttle current increases to a predetermined value, after which the signal, for example, a current relay (not shown), unlocks the thyristor 7. The throttle current is closed through the thyristor 7 and the capacitor 8, which can be precharged for more reliable locking of the bridge thyristors. After locking the thyristors of the Bridge, determined by the time required to restore their locking ability, they are given start-up pulses, i.e., two opposite thyristors of opposite phases are unlocked. The throttle current 2 flows through these thyristors and the phase A capacitor, and the thyristor 7 is locked. As the capacitor charges, a voltage appears at the output of the current inverter and the start is complete. When using the proposed method, the current at start-up mainly flows through the thyristors of the bridge, designed for long-term operation at rated current. The duration of the current flow decreases significantly, respectively, the installed powers of the thyristor 7 and the resistor 9 of the starting device 6 can be reduced. This simplifies the inverter and increases its efficiency. A method for starting a current inverter comprising a thyristor bridge with a capacitor in an AC diagonal and a smoothing choke in the DC circuit of the bridge, as well as a thyristor starting device included in the DC diagonal of the bridge, consisting of closing the smoothing choke circuit, increase the current in the inductor to a predetermined value and then apply control pulses to the thyristors of the bridge, characterized in that, in order to increase the efficiency and simplify the instrumental implementation of the inverter by smart The duration of the current flow interval through the starting device, the circuit of the smoothing choke is made by unlocking the thyristors of the bridge, after increasing the current of the chokes to a predetermined value, unlocking the thyristor of the starting device, locking the thyristors of the bridge, and controlling pulses to the thyristors of the bridge are supplied after their locking properties are restored . Sources of information taken into account during the examination 1. Yu. G. Tolstov. Autonomous current inverters, M., “Energie, 1978, p. 184.

2. In the same place 185.