SU1429263A1 - Arrangement for resynchronizing a synchronous electric machine - Google Patents

Abstract

The invention relates to electrical engineering. The aim of the invention is / Two speed improvement. This goal is achieved by the fact that in the device for resynchronization of synchronous electric masking sensors 6 and 7, the excitation voltage is equipped with capacitors 11 and 14, respectively, and the logic elements OR 30, the logic elements HE 20, 23 and 29, the logic element OR 30 and RS-trig are introduced - ger 27. As a result, sensors 6 and 7 monitor instantaneous voltages on the field winding, which does not require the generation of control voltages on the thyristor driver 1 at the moment the field voltage passes through zero. 2 Il. about

Description

the region j corresponds to obtaining the maximum zero voltage across the

35

maximum accelerating moment. In addition, at the selected angle

the excitation supply ensures reliable locking of the thyristor switch 4. When braking occurs (a generator moment, a signal appears at the output of the meter 26 of the active power voltage, which through the third driver 25 pulses and the first logic element OR 22 enters the Q-input S of the second trigger 27. In this case, a signal appears at its inverting input, which is supplied to the control input of Stop thyristor exciter 1 and the excitation current is switched off. A recurrent of the excitation current occurs after ohozhdeni zone rotor braking torque.

The signal for switching the trigger 27 in the position corresponding to the impulse supply to the control input Start is generated in the following circuit: the second pulse shaper 15, the trigger 17, logical

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50

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elements AND 21, OR 30, and 24, R-input of trigger 27. Gaiynia of the rotor field S pauses the excitation current, the thyristor switch 4 and the starting resis

About Zeroing Voltage

five

Q

five

0

five

winding 2 excitation.

The active power meter must be instantaneous with a continuous control of the magnitude and direction of the active power in the stator motor circuit. The signal at the output of the active power direction meter 26 appears when a certain value of the active power setpoint is reached from the electrical machine to the network.

Reducing the duration of the asynchronous stroke during desync is avoided by maintaining a positive torque on the shaft and quickly detecting the asynchronous mode without using special rotor angle position sensors for this purpose.

Since the first 6 and second 7 rotor voltage sensors monitor the instantaneous voltage value on the field winding, the control voltage on the rotor is not required to send a control signal to the thyristor activator.

This ensures high performance of the device as with resins.

chronizadia, and with asynchronization start.

Claims (1)

Invention Formula A device for resynchronizing synchronous electric machines containing a thyristor exciter with leads for connecting to the excitation winding of a synchronous machine, successively interconnected, a thyristor switch and a starting resistor connected between the indicated transistor exciters, two sensors voltages, each of which is made in the intake of series-connected resistors and a zener diode, and) the input is connected to the thyristor and jHoro exciters; two formers: pulses, each input co | is one with the output of one of the excitation voltage sensors, a meter for directing active power, to the output of which the input of the third driver and 1-puls is connected, the first logic element is NOT, the first, second, third and fourth logic elements are AND the first RS trigger , the first logical element OR, which differs from the fact that, for the purpose of higher i-speed, each exciter voltage sensor is equipped with a capacitor connected in series with a resistor, the free voltage of the capacitor forms the input voltage of the sensor and excitation ,, the second third and fourth logical elements are NOT, the second RS-flip-flop and the second logical element OR, and the output of the first pulse shaper is connected to the R-input of the first RS-flip-flop and through the first logical element NOT to the first input of the first logical element I, the output of the second pulse maker is connected to the S input of the first RS flip-flop and through the second logic element NOT to the second input of the second logical element I the second input of the first logical element AND, the output of which is connected to the second input of the first logical element OR, connected by the first "INPUT to the output of the third pulse generator, and through the fourth logical element NOT to the third the input of the fourth logic element I, the output of the first logic element OR is connected to the Z-input of the second RS flip-flop, the inverting output of which is connected to the control input of the Stop thyristor exciter, the control input of the Start, which is connected to the output of the third And, the second input of which is connected to the non-inverting output of the second RS-flip-flop, and the R-input of the second RS-flip-flop is connected to the code of the fourth logical And, the starting output of the thyristor exciter is connected to the second input of the fourth And the first input of the third logical element AND, and through the third logical element NOT to the third input of the first logical element AND, the output of the second logical element AND connected to the second input of the second logical element OR, the output of which is connected to the first input of the fourth logical element AND , and the First input of the second logical element OR - to the output of the first pulse generator. Jils l I-I r- | r Ilr L Well in I I and P P J Well P P Figg