SU605302A2 - Movable electric power plant automatic frequency regulator - Google Patents

Description

one

The invention relates to the field of frequency control in mobile power stations C driven, for example, from a car engine.

According to the main author. St. No. 525218 is known for the automatic frequency control of a mobile power station with a drive alternator, for example, from a car engine, containing a sensitive element with a four-arm bridge, amplifiers with impulse devices connected to their outputs, an executive electric motor with a gearbox, a multivibrator and a differential chain, the choke is connected to one diagonal of the mentioned bridge, and the diodes to the inputs of the amplifiers and the outputs of the multivibrator, the input of which through the differentiating circuit The point and the diode are connected to the bridge's lane formed by a resistor.

The disadvantage of this regulator is the increased time of the transition process of frequency recovery at. its large deviations caused, for example, by switching a load that has a power comparable to the power of the generator. The increase in time is due to the oscillatory nature of the frequency control process.

The aim of the invention is to reduce the transient time, i.e.

2

quality is balanced The goal is achieved by introducing a time relay, a threshold device and a ramp voltage generator connected by an input to the outputs of a pulse device, and an output through a threshold device to the input of a time relay whose output is connected to the inputs of a pulse device. the moreover, the generator of the linearly increasing voltage is made with a capacitor at the output, the capacitor of the generator of the linearly increasing voltage, and sometimes This device is made in the form of a zener diode, in parallel with which the closing relay of the time relay is connected.

FIG. 1 shows a regulator circuit; in fig. 2 are timing charts for the frequency control operation.

The regulator contains a sensitive element with a four-arm bridge 1, amplifiers 2, 3 with their inputs 4, 5 impregnated devices 6, 7 connected to their outputs, a performance electric motor 8 with a gearbox 9, a multivibrator 10, a differentiating chain 11. In one diagonal of the bridge 1 includes choke 12, and the other through Diodes 13-16 - inputs of amplifiers 2, 3 and outputs of the multivibrator 10. Multivibrator input

lO through the differential circuit AND AND and the diode 17 is connected to one of the bridge of the bridge 1.

The controller also contains a time relay 18, a threshold device 19 and a linearly increasing voltage generator 20 connected by input 21 to the outputs of pulse devices 6, 7 using contacts 22-I, 23-1, relay 22, 23, and output 24 to input 25 of threshold device 19, connected by output 26 to input 27 of time relay 18, output 28 of which is connected to inputs 4.5 of impulse devices 6.7.

The threshold device 19 contains a zener diode 29, shunted by the contacts 30-1 of the relay 30.

The output shaft of the gearbox 9 is connected to the throttle valve 31 of the internal combustion engine 32, which drives the generator 33 of the power plant.

The regulator works as follows.

The voltage pulses supplied to the amplifiers 2, 3 from the output diagonal of bridge 1 and the multivibrator 10 are amplified and summed up so that when the frequency decreases, the relay 22 of the pulse device 6 is activated, and when the frequency increases, the relay 23 of the pulse device 7,. supply voltage / 7n (Fig. 2, a) to the corresponding winding of the executive engine 8, and the latter, through the gearbox 9, rotates the throttle valve 31 of the engine 32, changing the flow of the combustible mixture and, accordingly, the rotation speed of the engine 3 2 and the frequency of the generator current 33 until the frequency reaches the nominal value of ± and ± A /, where 2A / is the dead zone of the regulator.

With large frequency deviations, caused, for example, by a load commutation, having a power comparable to the generator power of the power plant, the following occurs (Fig. 2.6).

Simultaneously with the pulses supplied to the executive electric motor by 8 contacts 22-1 () of relay 22 (23), another pair of contacts of the same relay supplies voltage pulses to the input 21 of the linearly rising voltage generator 20. Transistor 34, unlocked by the base current, DC pulses flowing through the resistor 35, the magnitude of the collector's current, through the diode, 36 charge the capacitor 37, the voltage on which during the pulse increases linearly (L / C "a. 2 b). During the pause, the voltage practically remains constant. The voltage Uc, which is simultaneously the output voltage of the generator 20, increases from pulse to pulse and when the value of Usr is reached (Fig. 2.6), the threshold device 19 is triggered, i.e., the zener diode 29 starts to conduct. relay 30 and its contacts short-circuits the Zener diode 29. Capacitor

37, discharging, keeps TokoM discharging transistor 38 in the open state for a time p (Fig. 2.6) until it releases the relay 30.

The resistor 39 serves as the resistor 40 for adjusting the shutter speed, and the capacitor 37 charge rate is controlled by the resistor 40. Resistor 41 serves to discharge the capacitor 37 after the end of the transient process if the voltage has not reached f / cp.

The output contacts of the relay 30 are shunted for an exposure time tp the inputs 4, 5 of the pulse devices 6, 7, stopping the supply of pulses to the executive motor 8. The time of the time relay and the time delay is chosen so that after the supply of pulses stops, the frequency goes into the dead zone. The frequency continues to change after the termination of the regulation due to the inertia of the generator-prime mover system.

In the absence of devices 18, 19, 20 (see the dotted line in Fig. 2.6), pulses are applied to the executive electric actuator while the frequency is outside the sensitivity zone, THAT leads to an overshoot, i.e. an oscillatory adjustment process. The frequency due to the inertia of the system, changing, goes beyond the deadband and

causes the operation of another channel of the regulator, increasing the transient time fppo compared with tn (Fig. 2.6). Thus, the introduction of time relay 18, threshold device 19 and generator 20 into the controller

reduces the time-of-transition process of frequency regulation, thereby improving the quality of regulation.

Claims (4)

1. Automatic frequency control of a mobile power station according to aut. St. No. 525218, characterized in that, in order to improve the quality of control, the onboard regulator has a time relay, a threshold device and a lane voltage generator connected by an input to the outputs of a pulse device, and an output of a threshold device. About the time relay input, the output which is connected to the pulses of pulse devices. 2. The regulator according to claim 1, characterized in that the linearly increasing voltage generator is provided with an output capacitor. 3. The regulator according to claim 1, characterized in that the capacitor of the linearly rising voltage is used as the time element of the time relay driver. 4. The regulator according to claim 1, which differs from the fact that the threshold device is made in the form of a zener diode, in parallel with which the closing contact of the time relay is connected. 254 . / / .and"