SU597060A2 - Automatic frequency control device for movable electric power plants - Google Patents

Description

29, an engine 30 driving a generator 31 of a power station. The controller also includes an additional forcing unit 32, consisting of amplifiers made of transistors 33 and 34, relays 35 and 36, connected by inputs through a differentiating circuit containing a capacitor 37 and resistors 38 and 39 to the excitation winding 40 of generator 31, connected to the voltage regulator 41.

The electrical part of the regulator 26 n the additional forcing unit 32 constitutes the electrical part 42 of the proposed frequency regulator.

The regulator works as follows.

With an abrupt change in the load on the generator terminals (switching on and switching off consumers), the voltage regulator 41 also abruptly changes the voltage on the field winding to compensate for the response of the core. If the load is increased, the voltage on the field winding 40 also increases, and the charge current of the capacitor 37, which flows through the resistor 38 and the base of the transistor 34, unlocks the latter. The relay 36 is energized and energizes the executive motor 27, which, on the throttle valve 29 of the prime mover 30, increases the fuel supply, thus preventing a decrease. generator frequency 31. When the generator load decreases, the voltage on the field winding decreases. The discharge current of the capacitor 37, charged prior to the voltage of the field winding, flows through the resistor 39 and the base of the transistor 33, which opens the latter. The relay 35 is activated and by its contact .m supplies power to the executive engine 27, which, acting on the throttle valve 29 of the prime mover 30, reduces the fuel supply, thus preventing an increase in the frequency of the generator 31. The time during which the signal to the executive engine is supplied is determined by the change in the voltage of the excitation winding (change in load), the time constant of the differentiating chain and the amplification factors of the amplifiers, i.e., at constant parameters, the circuit is proportional to e Connecting or disconnecting the load. Taking into account that the frequency deviation in the absence of regulation is proportional to the change in the active power of the consumers, and the voltage change on the field winding required to compensate for the reaction of the core and the voltage constant at the generator output depends on the total power of the consumers The forcing unit will generally be partial, i.e., after a load change, the frequency will not take on the value that was before the load change.

Exact frequency control is carried out by a known part of the regulator circuit, which reacts to frequency deviation and consists of elements 1 to 31. The resonant circuit made up of chokes 4 and capacitor 5 is tuned to a frequency equal to the nominal frequency of the generator. When the frequency deviates from the resonant voltage on the output diagonal of the four-shoulder bridge, it changes in magnitude and

phase. As the frequency increases, the voltage of the sensing element supplied to the input of the phase-sensitive amplifier is opposite in phase to the voltage of the winding of the transformer 7, and the capacitor 12 is charged through a diode, 14 to a voltage determined by the parameters

circuit and frequency deviation, since the resistance of the charge circuit is small, the charge occurs almost simultaneously with the frequency change. When the frequency decreases, the capacitor 13 is similarly charged. The capacitor 24 (25) of the pulse device is charged before the switching voltage of the diode 18 (19). Upon reaching the switching voltage of the diode 18 (19) on the capacitor 24 (25), the latter is unlocked, and the voltage is applied to the winding of the relay 20 (21). The relay is triggered and is in such a state that the capacitor 24 (25) is not discharged and the voltage drops to the release voltage of the relay. After that, the cycle repeats. When a relay is triggered, its closing contacts bypass the switching diode

18 (19), which is locked.

At the same time, the second closing contact, pevie, supplies the supply voltage to the appropriate winding of the executive motor, and the latter, through the reducer, produces

0 turn the throttle of the drive engine, changing the flow of the combustible mixture and, accordingly, the speed of rotation of the engine shaft. The cycle is repeated until the rated current frequency of the power plant is established. Thus, the current frequency regulator auth. St.

5 No. 237232, which responds to frequency deviation, is supplemented by a device that responds to load changes.

The advantage of the proposed controller is that the first signal to the executive motor arrives almost simultaneously, but with a change in load and not after a frequency deviation by the threshold value, which shortens the transient process and increases accordingly the speed of the controller as a whole.

Claims (1)

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