SU739703A1 - Device for stabilizing frequency of self-containing power supply source - Google Patents

Description

one

The invention relates to a conversion technique and is a frequency stabilization device for auto-. power sources with elevation. cervical requirements for power quality,

Known autonomous system with variable speed drive, co. holding a high frequency generator that rotates from a variable speed drive. A static frequency converter (FH) is connected to the generator. The form of the output voltage of the HRO is not provided. meets the quality requirements of the elec- therefore, an electromachine filter is connected to the output: an asynchronous motor (BP), on the shaft of which there is a generator of stable frequency and voltage with a small nonlinear distortion factor,

The change in the frequency of rotation of a stable frequency generator at a constant frequency and voltage value of the output of the FHC is determined by the magnitude of the slip of the arterial pressure when the load changes. To stabilize the frequency

rotation, it is necessary to vary the frequency and voltage at the FH output accordingly.

To maintain the frequency of rotation of the generator with the required accuracy, digital frequency controllers are connected to the system. Digital frequency frequency controllers are known that are based on counting

10 pulses per unit of time and comparison of the resulting number of pulses per unit of time with the specified 1. Difference in. The digital form is a proportional error of the automatic control system. A number characterizing the difference frequency is recorded in a memory device, where it is stored until the next comparison. The number 20 written in the memory device is converted into an analog signal, acting through an amplifying link on the object to be controlled by the drive. In this case, a measurement time is required, during which the controller does not respond to a change in speed (dead time). This reduces the dynamic properties of the controller.,

thirty

 Also known is a device for stabilizing the frequency of an autonomous power source, built on the basis of a continuous count of the difference in the number of pulses from a stable source of frequency and number of pulses from the rotational speed sensor 2,

This device contains a synchronization block at the input, a reversible counter, a generator of the reference frequency, the output of which is connected to the first input of the controlled frequency divider, to the second input of which the master unit is connected.

The comparison organ in such a controller is a reversible counter, for one charge of which a pulse is supplied;

on the other - the disputed frequency pulses. The reference frequency is generated by a reference oscillator, a frequency, and is fed to the input of a controlled frequency divider, With the aid of a master device. At the same time, the division ratio of the controlled frequency divider is set such that the frequency at its output is proportional to the predetermined frequency of rotation of the shield. The difference between the set and the actual frequencies, recorded by a reversible counter, is transmitted in digital form to the input of the code-analogue converter, and then through the amplifying link to the Control Object. The difference in clock counter in a reverse counter can only be expressed by an integer number of pulses. Therefore, at a frequency difference of 1 Hz, the difference recorded in the reversible counter will change to 1 unit B.1 s, Yes speed increase

requires the use of high-frequency rotational speed sensors, which, with; leads to a decrease in reliability and an increase in the cost of equipment. .

The purpose of the invention is to improve the dynamic characteristics of the device. This is achieved by the device for stabilizing the frequency of the HOMHord auto and its power supply, consisting of a high-frequency oscillator with variable speed drive, frequency converter at the output of the generator and an electromotor filter containing a clock unit at the input, reversible counter, generator of reference frequency, the output of which is connected to the first control input-. A splittable frequency divider, to the second input of which the master unit is connected, is supplied with a reference duration setting device, a setting time limiter. frequency deviation, delay unit and comparison unit. At the same time, the outputs of the synchronization unit are connected to the input of the unit master of the reference duration and to the input of the unit of the permissible frequency deviation. On . other inputs of these units are connected

reference frequency generator output. The outputs of the master clock of the reference duration and the master of the frequency tolerance are connected to the inputs of the comparator unit. The output of the comparison unit is connected to a reversible counter and an input to the delay unit. The output of the delay unit is connected to the input of the comparator unit, and the output of the reversible counter to the input of the controlled frequency divider, the output of which is used for connection, to the control frequency input of the frequency converter.

The drawing shows a diagram of an auto power source with a device for frequency stabilization.

An autonomous power supply consists of generator J. with a variable speed drive, a static frequency converter 2, the output of which is an electric machine, a filter consisting of an induction motor 3 and a stable frequency generator 4,. .

The device for stabilizing the frequency comprises a synchronization unit 5 for converting the sinusoidal voltage of the generator 4 into a pulse voltage of short duration on crossing the zero positive and negative half-wave of the sinusoidal voltage. From the output of block 5, the pulses corresponding to the transition through the zero of the positive half-wave voltage are fed to the input of the master of the standard duration, the master of the reference duration determines the frequency of stabilization. From the output of the generator 1, the pulses correspond to the transition through the zero of the negative half of the voltage applied to master setting 7 Frequency tolerance. The pulse duration from the output of the setting device 7 is determined by the specified accuracy of maintaining the frequency of the generator 4, the signals from the output of setting devices b and 7 are sent to the comparison unit 8.

The device for stabilization-frequency contains. Also - block 9 delay reversing counter. 10, controlled frequency divider 11, block 12, reference frequency generator 13.

Claims (1)

Depending on the result of the comparison with the output of block 8, a pulse is applied to the Comparative bus or to the subtraction bus of the reversible counter 10. The signal from the reversible counter 10 changes the division ratio of the frequency divider 11 in an appropriate manner. Since the change in the frequency of the generator 4 is determined by the change in the decay of the asynchronous motor 3 and does not exceed 10%, the dividing unit 12 provides a division factor corresponding to the idle generator, while the reversible counter 10 is in the state of zero count, the generator 13, the reference frequency is connected to the controlled frequency divider 11, a setpoint generator of this duration and 3: an admittance 7 of the frequency tolerance. With the passage of a pulse from the output of the comparison unit via the addition bus or lower presses, a delay block 9 is started, which prohibits the passage of pulses from the comparison block 8 until the system has passed the last pulse. ; The stabilization device works as follows. . When the frequency of rotation of the generator 4 decreases, the pulse decay sets the reference duration after the passage of the pulse from the setpoint generator 7, and from the output of the comparison unit, the pulse arrives. This impulse goes to the reversing counter 10 and the delay block 9. The reversing counter increases its content by one. The division ratio of the controlled splitter hour is reduced, and its output frequency, fed to the FHR, is increased. The frequency of rotation of the generator 4 is increased. Upon receipt of the pulse pulse on the delay unit 9, a temporary prohibition on the passage of pulses from the comparison unit 8 is introduced. After the system has processed the pulse transmitted to the reversing counter 10, the pulse is removed. When the generator frequency 4 is exceeded, a predetermined decrease in the pulse of the setting device 6 of the reference duration comes from the output pulse from the setting device 7, and a pulse comes from the output of the comparison unit 8. This impulse arrives at the subtraction bus of the reversible counter 10 and the delay unit 9. A reversible counter reduces its content by one. The division ratio of the controlled frequency divider increases, and. him. the output frequency applied to the microwave is reduced. The frequency of rotation of generator 4 is reduced. The delay unit 9 operates in a manner similar to frequency reduction. If the pulse of the setpoint adjuster b of the reference duration arrives at the moment coinciding with the presence of the impulse output of the setpoint 1, then at the output of the comparison unit 8 there are no pulses. The output frequency of the controlled divides the frequency 11 does not change. | and the frequency of rotation of the generator 4 is in the required range. The proposed device is characterized by greater reliability and high speed. If the known 2 device performs a 1 Hz deviation per 1 s, then the proposed same deviation works within 10 ms. Claims. Device for stabilizing the frequency of an autonomous power source consisting of a high-frequency generator with a variable speed drive, a frequency converter at the generator output and a motor filter containing a synchronizing unit at the input, a reversible counter, a reference frequency generator whose output is connected to the first input of the controlled divider Frequency, which is connected to the BTopObiy input (Ii unit, D tl and so that, in order to improve, for the device, it is equipped with sensors for ohm of the reference duration, the setpoint of the permissible frequency separation by the delay block n the comparison unit, the outputs of the synchronization unit are connected to the input of the reference duration setting unit and to the input of the setting unit permissible frequency deviation, to the other inputs of which the output of the reference frequency generator, outputs of the setting reference time generator and setting unit of the frequency tolerance is connected to the inputs of the comparison unit, the output of which is tapped to the reversing counter and the input of the delay unit, the output of the backward unit The holders are connected to the input of the dpaBHeHHB unit, the output of the reversible counter is connected to the input of a controllable frequency divider, the output of which is used to connect to the frequency control input of the frequency converter, "Sources of information taken into account during examination 1, Bogorad G.Z, , Kiblitsky V, B, Digital controllers and velocity meters, M, g Energy / 1966, p. 86, 2, Bogorad, G.Z., Kiblitsky, V.V., Digital Controllers and Meters of Grief, M., Energie, 1966, p. 96. //