SU1515329A2 - Device for controlling excitation of synchronous generator - Google Patents

Abstract

The invention relates to electrical engineering. The aim of the invention is to increase the stability and quality of regulation. The device contains sensors: deviations of the voltage of the generator 4, a derivative of this voltage 5, deviations of the stabilizing mode parameter 6 and its derivative 7, the outputs of which are connected to the inputs of the adder 3, block 9 for damping large oscillations, the output of which is connected via a controlled key 13 s output of the adder 3, the control circuit key 13, including the elements 14-25. The essence of the invention lies in the fact that in the control circuit of the key 13 a meter 23 of the amplitude values of the signal is used. A feature of the operation of the device is that the damping unit 9 of large oscillations is connected to the input of the adder 3 at the moments when the amplitude value of the mode parameter of a given magnitude is exceeded. 2 Il.

Description

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The invention relates to electrical engineering and can be used to control the excitation of high-power synchronous generators controlled by high-power automatic excitation controllers (ARV

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The purpose of the invention is to increase the stability and quality of the regulation of the Q. order to increase the sensitivity of the device to emergency disturbances.

Figure 1 shows the structural diagram of the device; Fig. 2 illustrates the electrical circuit for measuring the amplitude value of the signal.

The devices for controlling the excitation of the synchronous generator include a driver 2 connected to the rotor circuit of the synchronous generator 1, connected to the output of the adder 3, to the inputs of which sensors are connected:} 4 generator voltage deviations,

5 derivative generator voltage, 25

6 of the stabilizing mode parameter, 7 derivative of the stabilizing mode parameter, and the output of the current and voltage feedback block 8, the input of which is connected to the output of the shock (the adjuster 2. The device also contains a large-oscillation damping block 9, including the sawtooth generator 10 voltage, block 11 multiplying and additional adder 12, the input of the generator 10 sawtooth voltage and one of the outputs of the additional adder 12 is connected to the output of the sensor 6, the second input of the additional Q adder 12 is connected to the output of the multiplication unit It, whose inputs are connected respectively to the output of the sawtooth generator 10 and the output of the sensor 7, the output of the additional adder 12 connected to one of the inputs of the main adder 3 via a control key 13, to the control input which is connected to the output of the element OR 14, one of the inputs of which through the first comparator 15 is connected to the output of the circuit containing a series-connected diode 16 and a U-shaped R CR four quadrupole (RC circuit) 17 of two resistors 18 and t9 and a capacitor 20 between them free access diode 16 connected to the output of the sensor 7 and the second vghod OR gate 14 is connected

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The second comparator 21 is connected to the output of the first comparator 21, the maximum permissible value setting device 22 is connected to the derivative of the mode parameter, and the second input of the comparator 21 is connected to the output of the amplitude value meter 23 of the signal whose input is connected to the output of sensor 7. Moreover, the resistance R of the resistor 18 is less than the resistance R of resistor 19.

The meter 23 of the amplitude values of the signal is made on the rectifier 24 and the converter 25 amplitude values, and the input of the rectifier 24 is connected to the input of the meter 23 amplitude values of the signal, and its input is connected to the information input of the converter 25 amplitude values. The power part of the amplitude-value projection generator 25 includes a switch 26 connected in series with a storage capacitor 27. The outputs of which are the output of the signal amplitude value meter. The converter control unit contains an extremer 28, the input of which is connected to the input of the measurer of the amplitude values of the signal, and the output through the differentiating converter 29 and the one-shot 30 to the control key circuit 26. The extremer includes an additional one. a key 31 through which the input of the amplitude value meter of the signal is connected with a series-connected additional capacitor 32 and a low-impedance input of the amplifier 33, the output of which through the trigger 34 is connected to the input of the differentiating converter 29.

The device works as follows.

In all modes of operation, the signals from the outputs of sensors 4-7 and block 8 of feedback are fed to the inputs of the main adder, ensuring the operation of the controller according to the unified APB SL circuit. At the same time, the output signal of the sensor 6 is fed to the generator 10 of the sawtooth voltage, which captures the moment of each change of the sign (zero crossing) of the deviation signal of the stabilizing mode parameter and generates an auxiliary signal at the output proportional to the time from the moment of changing the sign of the signal at the sensor output 6. The signal from the output of the generator 10 is fed to the input of the multiplication unit 11, the second input of which receives the output signal of the sensor 7 derivative. mode parameter deviation. The output signal from the multiplication unit 11 is fed to one of the inputs of the additional adder 12, the second input of which receives the output signal of the sensor 6. The stabilizing signal generated in this way from the output of the additional adder 12 is fed to the information input of the key 13.

53296

There is a non-zero signal that arrives at the control input of the key 13 and causes it to close. As a result of the output of the damping unit 9, large oscillations are connected to one of the inputs of the adder 3. At the same time, the stabilizing signal itself is fed to the output adder of the regulator.

0 In the described state, the circuit is located until the production parameter of the extreme value is reached. At this moment, the voltage at the input of the KC circuit stops increasing

In the normal mode of operation, generator-15 is personalized, the current through circuit 20-18 stops 1, the output signal of the derivative sensor 7 is substantially less than the output signal of the setter 22, fed to the input of the comparator 21, whose output signal at the specified 20 ratio of input signals is zero. Since in this mode, the output signal of the sensor 7 is almost zero, the output of the comparator 15 is also a zero signal. 25 When: zero signals at the inputs of the element OR 14, the signal at its output is also zero and the key 13 is in the open state, disconnecting the output signal of the damping unit 9 of the large amplitudes of oscillations from the adder 3.

In the emergency mode of the generator 1, at the output of the sensor 7, the derivative appears significantly different from

and the voltage at the output of the CS circuit 17 becomes equal to zero, thus fixing the moment when the current value of the mode parameter of the new extreme value is reached. This value is stored on the capacitor 20 and is subsequently used as the previous extreme value. The termination of the current in the RC circuit 20-18 and the resetting of its output signal leads to the overturning of the comparator 15, the zero input signals of which lead to the appearance of the zero output signal, the removal of the control signal from the key input 13, its opening and the disconnection of the damping unit from the entrance of the main sum of the matrix 3.

After reaching the extremity, the variable signal is positive. the maximum value of the voltage in the half-wave of which through the diode 16 is fed to the input of the circuit 17.

The signal arriving at the RC circuit 47 corresponds to the current value of the pin of the RC circuit 17 begins to decrease in accordance with the change in the positive half-wave of the output signal of the sensor 7. At the same time, the current in the RC circuit 17

of the water mode parameter in section 40 (changes direction, i.e., condensation-positive half-wave. As the current value of the derivative increases, it is compared with the extreme value previously recorded on the RC circuit 17 (for the first alarm a comparison with a zero signal occurs.) At that moment, when the current value exceeds the previously stored ExtOPITOP 20, the discharge is discharged along the resistance loop 18-20-19. The choice of the loop resistances from the conditions R. R, respectively, the resistance of the resistors 18 and 19) It provides memorization of the extreme value for a time of 10–20 s, corresponding to the attenuation of practically any electromechanical transient processes of the generator, via a capacitor 20, resistively generated by emergency disturbances.

The torus 18 of the RC circuit 17 begins to flow a current that charges the capacitor 20, causing a voltage drop across the resistor 1-8 and the appearance of a positive terminal at the input of the comparator 15. Thereby, the excess of the current value over the previously stored extreme value is fixed. At the output of the comparator 15 in this case, if, in the process of damping the disturbed motion, the subsequent current value of the derivative exceeds the fixed one, then the whole cycle of operations is repeated.

In all modes of operation of the device, the meter 23 amplitude values of the signal, the inputs of which receive the output signal of the block 7 derivative

the voltage at the output of the CS circuit 17 becomes equal to zero, thereby fixing the moment when the current value of the operating parameter of the new extreme value is reached. This value is stored on the capacitor 20 and is subsequently used as the previous extreme value. The termination of the current in the RC circuit 20-18 and the resetting of its output signal leads to the overturning of the comparator 15, the zero input signals of which lead to the appearance of the zero output signal, the removal of the control signal from the key input 13, its opening and the disconnection of the damping unit from the input of the main adder 3.

After the moment of reaching the extremes of the RC circuit 17, it begins to decrease in accordance with the change in the positive half-wave of the output signal of the sensor 7. At the same time, the current in RC circuits 17

(changes direction, i.e. condensation

ITOP 20 is discharged along a 18-20-19 resistance contour. The choice of the resistance circuit of the conditions R. R, respectively, the resistance of the resistors 18 and 19) ensures that the extreme value is stored for 10–20 s, which corresponds to the attenuation of almost any electromechanical transient processes of the generator, but if in the process of damping the disturbed motion the subsequent current value of the derivative exceeds the fixed, then the whole cycle of operations is repeated is.

In all modes of operation of the device, the meter 23 amplitude values of the signal, the inputs of which receive the output signal of the block 7 derivative

of the stabilizing parameter, forms the output step signal, the magnitude of which is equal to the fixed amplitude value of the derivative of the stabilizing parameter. The magnitude of the output signal of the meter 23 of the amplitude values of the signal changes at the moment when the input signal passes its own amplitude value.

An excess of the amplitude value of the maximum permissible value, determined by the output signal of the setting device 22, results in a nonzero output signal of the comparator 21 and, accordingly, a control signal at the input of the key 13, which closes regardless of the state of the comparator 15. Decrease of the amplitude value the signal of the derivative below the level of the output signal of the sensor 22 leads to the appearance of a zero output signal of the comparator 21 arriving at one of the inputs of the element OR 14; Arathor 15 output signal is not equal to zero, the switch 13 remains closed, otherwise the switch is opened, turning off the output of unit 9 dampening Rovani large oscillations from the adder 3.

The meter amplitude values of the signal 23 operates as follows.

The variable signal received at the input of the signal amplitude values is differentiated and amplified by a circuit including an additional capacitor 32 and an amplifier 33, and is fed to the input of the trigger 34. The trigger 34 is in one of the stable states and switches at the moment of signal transition at its input

cut zero, which correspond to the moments of passage of the signal at the input {of the amplitude values meter of the signal of extreme values. Flip-flop triggers a pulse at the output of the differentiating converter 29 that triggers the single-vibrator 30. At the time of the appearance of a short signal at the single-vibrator output, switch 26 closes, which ensures the charge of the storage capacitor 27 to a voltage equal to the output voltage of the rectifier 24 which, at the time of closing the key 26, corresponds to the amplitude value of the input signal of the meter 23, the amplitude value of the signal. Therefore, the voltage on the storage capacitor has a step shape and is equal in magnitude to the amplitude values of the specified signal.

The use of a device for controlling the excitation of a synchronous generator provides a strong effect on the disturbance of the disturbance, which improves the stability and quality of the controllers.

Claims (1)

Invention Formula A device for controlling the excitation of a synchronous generator according to the ed. St. N 1325658, characterized in that, in order to increase the stability and quality of regulation by increasing the sensitivity of the device to emergency disturbances, a signal amplitude meter is inserted through which the second input of the second comparator is connected to the output of the sensor of a stabilizing mode parameter and the free diode output. 2