RU161374U1 - VOLTAGE REGULATOR FOR SYNCHRONOUS GENERATOR - Google Patents

Abstract

The utility model relates to the field of electrical engineering and electrical engineering, and in particular to aviation power supply systems. The voltage regulator for a synchronous generator contains a control unit and an output power stage connected to the excitation winding of the generator with controlled keys, diodes, a choke and a capacitor. The first and second outputs of the control unit are connected respectively to the input of the first managed key and to the input of the second managed key. The first and second outputs of the first managed key are connected to the first output of the second managed key through the inductor and through the capacitor, respectively. The second output of the second controlled key is connected to the first output of the excitation winding of the generator. Shunt diodes are connected to both managed keys in parallel. The voltage regulator reduces the voltage surge during load shedding, significantly improving the quality of electricity.

Description

VOLTAGE REGULATOR FOR SYNCHRONOUS GENERATOR

The utility model relates to the field of electrical engineering and electrical engineering, and in particular to aviation power supply systems.

Known is a typical circuit of a single-cycle DC-DC converter, Production Edition, Moin B.C., "Stabilized Transistor Converters", Moscow, Energoatomizdat, 1986, p. 13, Fig. 1.4b, in which, when the transistor (key) is open, energy is accumulated in the inductor, and when the transistor (key) is closed, this energy is transferred to the load through the diode.

Also known is a transistor voltage regulator used with direct current generators and working in conjunction with collector starter generators, MEI Publishing House "Electrical Equipment for Aircraft", Volume 1, Moscow, 2005, pp. 290-291, in the circuit of which a widely known output power supply is used cascade, the electrical circuit of which contains transistors (keys), diodes, inductors, capacitors.

A significant drawback of this transistor voltage regulator is the insufficient current decay rate in the excitation winding of the generator during load shedding during operation of this regulator, which leads to a decrease in the reliability of the power supply system as a whole.

The proposed voltage regulator for a synchronous generator allows you to increase the rate of current drop in the excitation winding of the generator during load shedding, which reduces the voltage surge during load shedding, and thereby significantly improves the quality of electricity.

The technical task of the utility model is to increase the rate of current decline in the excitation winding of the generator during load shedding, to improve the quality of electricity.

The technical result is achieved in the voltage regulator for a synchronous generator, containing a control unit and connected to the excitation winding of the generator output power stage with controlled keys, diodes, inductor and capacitor. The first and second outputs of the control unit are connected respectively to the input of the first managed key and to the input of the second managed key. The first and second outputs of the first managed key are connected to the first output of the second managed key through the inductor and through the capacitor, respectively, and the second output of the second managed key is connected to the first output of the generator excitation winding. Shunt diodes are connected to both managed keys in parallel.

The voltage regulator for a synchronous generator allows you to get a larger negative average value of the voltage on the field winding of the generator, which provides a faster decrease in the current of the field winding.

In FIG. 1 is a functional diagram of a voltage regulator for a synchronous generator; FIG. 2 shows a timing diagram of changes in signals and controller parameters, where:

1 - the first managed key;

2 - the second managed key;

3, 4 - shunt diodes;

5 - throttle;

6 - capacitor;

7 - field winding of the generator;

8 - control unit;

9 - generator load;

10 - generator

Exerc 1 - the first control signal;

Exerc 2 - the second control signal;

U is the voltage across the field winding 7;

I - field current 7;

t ₀ - moment of time of load shedding 9;

D is the duty cycle. The voltage regulator for a synchronous generator contains a control unit 8, an excitation winding 7 and a load 9 of the generator 10. The power cascade of the regulator is made on controlled switches 1 and 2 with shunt diodes connected to them in parallel, respectively 3 and 4. The first controlled switch 1 and the second controlled switch 2 connected to the inductor 5 and the capacitor 6. An excitation winding 7 of the generator 10 is connected to the output of the power stage.

The voltage regulator for a synchronous generator operates as follows.

In static modes of operation of the voltage regulator, the control unit 8 generates antiphase control signals Upr 1 and Upr 2 with a duty cycle D determined by the measured voltage at the load 9 of the generator 10. The first control signal Upr 1 goes from the control unit 8 to the first controlled key 1 and sets the relative the duration of its open state. The second control signal Upr 2 goes from the control unit 8 to the second managed key 2, setting the relative duration of its open state. In this case, the duty cycle D has a value D> 0.5 and the average voltage U (in Fig. 2 is shown by a dashed line) on the excitation winding 7 of the generator 10 has a positive value.

At time t ₀ , when the controller is in transition mode due to load shedding 9 of the generator 10, the control unit 8 briefly generates a PWM signal with a duty cycle D <0.5, abruptly changing the duty cycle D of the control signals Upr 1 and Upr 2.

When the duty cycle D changes, the average value of the voltage U on the excitation winding 7 of the generator 10 abruptly changes polarity and the current I of the excitation winding 7 of the generator 10 starts to decrease sharply.

Thus, the voltage regulator for a synchronous generator allows you to get a larger negative average value of the voltage on the field winding of the generator, which provides a faster drop in the current of the field winding, thereby reducing the duration of the voltage surge during load shedding, significantly improving the quality of electricity.

Claims (1)

A voltage regulator for a synchronous generator comprising a control unit and an output power stage with controlled keys, diodes, a inductor and a capacitor connected to the excitation winding of the generator, while the first and second outputs of the control unit are connected respectively to the input of the first controlled key and to the input of the second controlled key, moreover, the first and second outputs of the first managed key are connected to the first output of the second managed key through the inductor and through the capacitor, respectively, and the second output d of the second managed key is connected to the first output of the excitation winding of the generator, at the same time parallel shunt diodes are connected to both managed keys.

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