SU845247A1 - Device for control of valve-type converter - Google Patents

Description

(54) DEVICE FOR CONTROLLING VEPTILA CONVERTER

I

The invention relates to electrical engineering, namely, control systems for valve converters.

A device for controlling converter 1 is known, comprising an integrator, a zero-organ and a distributor, the disadvantage of which is low noise immunity.

The closest to the present invention is a device for controlling a converter containing an integrator with a reset key, the outputs of the voltage sensor and the bias source are connected to the inputs of the integrator, a zero-body, the outputs of which are connected to the inputs of the integrator and the bias source, and to the output pulses, the output of which through the OR element is connected to the reset key, and the control unit.

The disadvantage of the device is low speed.

The aim of the invention is to increase speed.

The goal is achieved by the fact that in a known device the null-organ is provided with an additional input to which the output of the control unit is connected.

The drawing shows a functional diagram of the control device.

The device contains a pulse distributor 1, connected to the inputs of the valve converter 2, with a load co. The second is a magnet 3 with a series-connected shunt 4. The signal of the error, which is formed when comparing the voltage of shunt 4 and the setting voltage of task block 5, is fed to the input of current regulator 6. Shunt 4, block 5 and controller 6

10 form a control unit.

The voltage control loop consists of a voltage sensor 7 and an offset source 8 connected to the summing inputs of the reference voltage generator 9,

5 consisting of an operational amplifier 10 with an integrating capacitor 11. The operational amplifier and the capacitor perform the functions of an integrator to which a reset key 12 is connected to reset it,

Claims (2)

jg the control input of which is supplied by the signals of the element OR 13. The inputs of the latter are connected to the outputs of the distributor of impulses, which is controlled by the null organ 14, to which signals are supplied from the reference voltage generator and from the current regulator. The device works as follows. The pulse from the pulse distributor 1, which arrives at the control input of the key 12 through the element OR 13, resets the output voltage of the integrator to zero. After this, the bias source voltage 8 and sensor 7 are integrated until the voltage at the input of the null organ 14, summed from the bias voltage Uc (and the output voltage of the integrator Uo of the integrator and Uy of the current regulator 6, reaches the trigger threshold. The output pulse the zero-body 14 through the pulse distributor 1 unlocks the corresponding valve in the converter 2 and through the element OR 13 - the discharge switch 12. Then the cycle of operation is repeated with the difference that at the end of the cycle the pulse from the output of the distributor I goes to the next valve Gate 2. Changes in the voltage at the output of converter 2 or control signal that occurs when current changes in shunt 5, i.e. in magnet 3, as well as when setting is changed in task block 5, leads to a new value of control angle at which the error is minimized. A high speed in the control device as compared to the opposed one is achieved by the fact that the moment of operation of the null organ is determined by the instantaneous value of the control signal and not by the value of its integral. The ratio of resistances through which the bias voltage Uj is applied to the integrato, pc to the null organ 14, is chosen so that in the steady state the pulse frequency produced by the null organ is constant and is determined by the number of converter phases and the mains frequency . With this setting of the system parameters, the linearity of the static characteristic of the valve converter takes place. The invention The device for controlling a valve converter containing an integrator with a reset key, the outputs of the voltage sensor and bias source, a zero-body, the outputs of which are connected to the integrator and the bias source, are connected to the integrator inputs, and the output switch is a pulse distributor whose output is the OR element is connected to a reset key, and a control unit, characterized in that, in order to improve speed, the nullorgan has an additional input to which the output of the control unit is connected. Sources of information taken into account in the examination 1.Shishillo V.P. Automated valve electric drive. M., “Energie, 1969, p. 166-171, fig. 3-9. 2. Control systems for thyristor and ion electric drives. Informelectro. M., 1971, p. 56, fig. 50.