JPS5914399A - Automatic frequency controller for motor driven generator - Google Patents

Abstract

PURPOSE:To enhance the reliability of a motor driven generator by providing two rising and falling set input circuits which can alter the set values only when a contact is closed. CONSTITUTION:Control gate circuits 24a, 24b open gates only while an operation switch 21 or 22 is operated or while the frequency increase or decrease signal of an automatic synchronous energizing unit 18 or an effective power sharing unit 20 is generating, and a pulse from a pulse generator 23 is transmitted to a pulse integration and subtraction counter 25. The integrated value of the counter 25 is converted by a digital-to-analog converter 26 to an analog voltage value. A deviation amplifier 10 controls the phase of a thyristor 13 in response to the deviation between the output of a frequency/voltage converter 6 representing the output frequency of a generator 3 and the output voltage of the converter 26. In this manner, the state immediately after the disconnection of the cable can be maintained even at the time when the cable is disconnected.

Description

DETAILED DESCRIPTION OF THE INVENTION This invention (d) relates to a device for controlling a motor generator so that its output frequency is automatically maintained at a preset value.

An example of this type of device was the one shown in Figure 1.

In meat, 1 (-j AC motor, 2 electromagnetic coupling, 2 AD (field winding, AD generator, 4illL and front cover, 5 step-down transformer, 6 frequency/voltage converter, 7 Input resistor, deviation amplification circuit combining 10th resistor 8 and capacitor V9, phase control circuit of 11th iris resistor 13,
12 ignition circuit, 141 automatic frequency control circuit for generator 3, 15.16t:1 frequency setter, 11 dots for automatic synchronization @ 118, 19 constant for effective power sharing compensation 20 It is an open connection.

Next, I will explain the operation of the CB. The frequency control of the power generation Ps3 is to transmit the rotation of the AC motor 1, which is rotating at a constant speed, to the generator 3. This is done by controlling the iris register 13. For example, in the case of single unit operation, the input voltage value set by the manual frequency setter 15, 16 is compared with the output of the frequency/voltage converter 6.
The deviation is input to the deviation amplification circuit 10. At this time,
If the set input voltage value is large, the output of the deviation amplification circuit 10 advances the phase of the iris register 13 through the phase control circuit 11 and the dipping arc circuit 12. Winding 2
The current of a is increased 7111, and the output frequency of power generation P83 is increased. First, the power of the set input voltage value is small.
is the output of the deviation amplifier circuit 10, which passes through the phase control circuit 11 and the arc circuit 12 to delay the phase of the yristor 130.
The current flowing through the field winding 2a is reduced to lower the output frequency of the generator 3. In addition, the automatic synchronization start 18 closes the normally open contact 11 (2), and the uniform speed signal of the automatic synchronization start 18 (
From the second point, frequency uniformity is affected. Next, add two lotus scoops to C.
The contact 17, which was closed by the previous automatic synchronization, is opened, and the contact 19 is now closed, and the active power sharing is divided by No. 1 (conventional). The automatic frequency control device f'l is constructed as above.
'C, the frequency setter 15 and 16 are faulty.

When the setting signal disappears due to a cable breakage or the like, the output frequency of the generator 3 fluctuates in proportion to the amount of signal, leading to serious failures such as power outages and system failures. In addition, disturbances are applied to the system according to the number of failures when the speed signal is cut at the completion of automatic synchronization, or when the η dynamic power sharing signal is cut when switching from single-wheel operation to independent operation.

Furthermore, when settings can be made in two or more places, there is a next layer in which the setting value of one setting device (thus affecting the frequency adjustment range of the remaining setting devices).

This invention provides two setting input circuits for the rising sieve, which can change the set price only when the contact closure is closed.
From the second point, even if the cable breaks, it will maintain its original state.
Another object of the present invention is to provide an automatic frequency control device for a generator that does not change the frequency adjustment range of other setting devices.

An embodiment of the present invention will be explained below with reference to the drawings.

In Fig. 2, the automatic synchronization device 18a, the automatic synchronization device 18a Riko's automatic synchronization device 18) are closed by the frequency increase signal, and the 18b is closed by the frequency decrease signal. It is an open contact layer.

In addition, 2(lη effective power sharing system, 20a is a normally open positive and negative which is closed by the frequency increasing signal from Riko's active power sharing device, and 20b is a normally open positive and negative which is closed by the frequency increasing signal from the active power sharing device.21 22 is an operation switch for increasing the set frequency, 22 is an operation switch for decreasing the set frequency, 23 is a rebalance generator, and 24a, 24b is a phantom control gate circuit. When the frequency is increased (=integrated) and when the frequency is increased to 1, the PALNU of the device 23ρ and the like is subtracted.26 This is a digital-to-analog converter that converts the digital output of the integration/subtraction counter 25 into an analog voltage value. Since the other elements of 7 are the same as those shown in FIG.

Next, the operation will be explained. control gate circuit 24a,
24bt: j, operation switch 21 and ne 22 operation Gyuto 1, open the gate only during automatic synchronization, frequency increase during wide effective power sharing, and signal generation, and integrate the pulses from the pulse generator 23・Inform the subtraction counter 25. For example, the operation switch 21 and the normally open contacts 18a, 2
When any one of 0a has a closing force, the control gate circuit 24
A is operated, and a pulse from the pulse generator 23 is input to the integration side input of the integration/subtraction counter 25, and the integration value increases. The digital-to-analog converter 26
1 telogram voltage range (=converted 1) is input to the deviation amplification circuit 10. In this deviation amplification circuit 10, the output voltage of the frequency V-voltage converter 6 indicating the output frequency of the generator 3 and the digital If the output voltage of the analog converter 26 is comparative name j, and the value of the rising signal is also high, the output frequency of the generator 3 is also high, the output of the deviation amplifier circuit 10 is
The phase of the firistor 13 is advanced through the first dipping arc circuit 12, and the field current is boosted to increase the generator output frequency a. Conversely, the operation switch 22 is also normally open and connected 19b, 2
When any one of 0b is closed (and the 1 signal is generated, the control gate !1vS24b opens and the pulse generator 23) is applied to the subtraction input of the integration/subtraction counter 25. The n pulse product N value decreases. As a result, the output voltage of the digital-to-analog converter 26 is lowered, causing an error in the output of the deviation amplifier circuit 10 and causing an error in the phase control circuit 1.
1. After 2 steps, the phase of the VIRISTOR 13 is delayed, and the generator's frequency O is reduced.

Also, each of the up signal and down signal is (+1
If it is not present, the count of the integration/subtraction counter 25 will not change.

In the above example, a combination of an AC motor 1 and a magnetic coupling 2 was shown as the driving means for the motor generator 3, but a current motor with a field winding or a power It is a variable speed electric motor using electronics and has good χ.
The same effect as the above-mentioned contamination example is achieved. In addition, as a means of changing the set voltage, a pulse generator as shown in the practical example,
Instead of a static type that uses a combination of a control gate circuit, an integration/subtraction counter, and a digital/analog converter, it is also possible to use an electric variable resistor that operates with a contact input.

As described above, the invention uses two setting circuits that operate when the contacts are closed and stop between the contacts. Even if an accident occurs, the frequency setting device remains in the same position as before the accident.Also, the operating power supply can be easily separated and interfaces with other equipment can be easily made, making it highly versatile and reliable. This has the effect of allowing the system to be configured.

[Brief explanation of the drawing]

The first diagram shows a circuit (8) showing a conventional automatic frequency control device,
2 is a circuit diagram showing an automatic frequency control device according to an example of the present invention; FIG. 1...L motive, 2...electromagnetic coupling, 3...
・Countercurrent generator, 6... Zhou tl! Ei/voltage converter, 10
... Deviation amplification circuit, 11... Phase control circuit, 12.
...Small arc circuit, 13...Power iris register, 14...Frequency automatic control circuit, 18...Automatic synchronization device, 18a
, 1 sb... Normally open J1.20... Effective vehicle power sharing sash, 20a, 20b... Open contact collapse, 21.22.
...Operation switch, 23...Pulse generator, 24a,
24b...Control gate circuit, 25...Integration/subtraction counter, 26...Digital/analog converter. In addition, the same reference numerals in the figures indicate corresponding parts.

Claims (1)

[Claims] (1) In the automatic frequency control equipment of the motor generator, the above set value is set so that the output frequency of the generator is compared with the set value and the rotation speed of the above generator is controlled according to the deviation C2 of the 7. An automatic frequency control system for a motor generator, characterized in that two setting circuits, one for frequency increase and one for frequency 1, which operate when A5 is closed and stop when A5 is open, are provided as setting input circuits. (21) The above setting input circuit includes an integration/subtraction counter, a first operation switch that inputs a pulse to the integration input of the integration/subtraction counter when closed, and a subtraction input of the integration/subtraction counter when closed. A second operation switch for inputting the same pulse, and a digital/analog converter for converting the voltage of the integration/subtraction counter into an analog voltage. Generator automatic cycle control IL