RU1809494C - Method of control over diesel-inertia set of guaranteed supply with asynchronized synchronous electric machine - Google Patents

Abstract

SUMMARY OF THE INVENTION: in order to provide a predetermined quality of energy on the tires of guaranteed power supply for a predetermined time of energy supply, the value of the assumed frequency change is additionally introduced into the law of control of the field of excitation of the rotor of an asynchronized synchronous machine, at the terminals of the asynchronized synchronous machine during its autonomous operation on load during this time. The desired magnitude of the expected frequency change is calculated as a function of operating time, magnitude of energy stored by the aggregate, magnitude of current active power consumed by the load, and the necessary time to start the drive motor and engage the clutch connecting the flywheel to the shaft of the drive motor. 1 ill., 1 tab. Ј

Description

The invention relates to energy, in particular to the field of autonomous energy with a diesel drive, in particular to diesel-inertial units of guaranteed power supply with an asynchronous-synchronous electric machine.

The purpose of the invention is to improve the quality of electrical energy in dynamic modes of the guaranteed power system.

The drawing shows a diagram of a device that implements the proposed method. The following notation is accepted here:

1 - network input;

2 - network input transformer;

3 - high-speed thyristor switch network input;

4 - bus power supply;

5 - switch asynchronous synchronous generator;

6 - asynchronized synchronous generator;

7 - flywheel;

8 - uncoupling clutch;

9 - drive engine;

10 - initial excitation generator;

11 is a speed sensor of a drive motor;

12 - frequency converter;

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13 - a regulator of the frequency of the generated alternating current, the amplitude of the rotor current and the phase of the resulting vector of the rotor field of the asynchronized synchronous generator;

14 - speed controller of the drive motor;

15 - frequency converter switch;

16 - the first electronic key;

17 - the second electronic key;

18 is a drive for synchronous rotation speed of a drive motor;

19 is a functional adjuster of a rotational speed of a drive motor;

20 is a shutdown electromagnet of an asynchronous synchronous generator circuit breaker;

21 - load sensor asynchronous synchronous generator;

22 is a load sensor of a guaranteed power supply system;

23 - thyristor key;

24 is a voltage meter of an asynchronized synchronous generator;

25 - the first circuit is NOT;

26 is a shutdown electromagnet of a frequency converter switch;

27 - a null organ;

28 - the second circuit is NOT;

29 - network generator frequency of the generated current;

30 is a network reference rotor speed generator;

31 - autonomous adjuster of the frequency of the generated current;

32 - the third electronic key;

33 - switching unit thyristor switch network input;

34 - current transformer sensor of the active load of the generator;

35 - current transformer of the active load sensor of the guaranteed power system;

36-solenoid switch generator;

37 illustrates an electromagnet for turning on the frequency converter;

3fc - one-shot;

39 shows the presence of an external network voltage.

The guaranteed power supply system consists of a network input 1, a network input transformer 2, connected via a thyristor switch 3 to a guaranteed power bus 4, an asynchronized synchronous generator 6 with a flywheel 7, connected through a switch 5 to a guaranteed power bus and mechanically connected by means of a disconnect

couplings 8 with a drive motor 9, On the same shaft with "(synchronized synchronous generator 6 is the initial excitation generator 10, and on the same shaft

a drive motor sensor 11 is provided with a drive motor. The frequency converter 12 is connected via an input 15 to the circuits of the synchronized synchronous generator, and the circuits of its inductor are connected directly to the output of the frequency converter and through the thyristor key 23 to the output of the initial excitation generator 10. The control input of the frequency converter 5 is connected to the control output a torus 13 of the frequency of the generated alternating current, the amplitude of the rotor current and the phase of the resulting vector of the rotor half, the first input of the regulator 13 is connected to the output voltage of the asynchronous voltage synchronized generator, the second input of the controller 13 is connected to the output of the network generator frequency of rotation of the generator, and the sixth input of the controller 13 is connected to the output of the third

5 32 an electronic key, the information input of which is connected to the output of the autonomous frequency adjuster 31, and the control input of this key through the second circuit is NOT 28 connected to the output of the zero-organ 27, the input

0 zero-organ 27 and the inputs of the adjusters 29 and 30 are connected to the output of the load sensor 22 of the guaranteed power system connected to the current transformer 35. The first input of the speed controller 14

5, the drive motor is connected to the output of the speed sensor 11, the second input of the controller 14 is connected to the output of the voltage amplifier 39 of the external network, the third and fourth inputs of the controller 14

0 is connected to the outputs of the first 16 and second 17 electronic keys and the information input of the first 16 electronic keys is connected to the output of the master 18 of the synchronous speed, the control input of this

5 keys are connected to the output of the first 26 of the circuit NOT, in parallel with this input are connected the input of the electromagnet 20 to turn off the generator circuit breaker, the input of the electromagnet 26 to turn off the circuit breaker

0 frequency and the control electrode of the thyristor switch 23. The information input of this circuit is connected to the output of the functional setpoint 19 of the frequency of rotation of the drive motor, and the control input

5 of the second 17 key is connected to the output of the voltage meter 24 of the asynchronized synchronous generator 6, parallel to this input is the input of the first 25 circuit NOT, one of the inputs of the thyristor switch switching unit 33,

the input of the single-vibrator 38 and the input of the electromagnet 37 to turn on the frequency converter 12. The output of the single-vibrator 38 is connected to the input of the electromagnet 36 to turn on the switch 5 of the generator 6. The first input of the function drive 19 of the speed of the drive motor is connected to the output of the speed sensor 11, and the second input of the drive 19 connected to the output of the generator load sensor 21 connected to the current transformer 34. The second input of the switching unit 33 is connected to the voltage of the network input between the network input transformer 2 and the thyristor by the circuit breaker 3. The input of the voltage amplifier 39 of the external network voltage is connected to the stator circuits of the generator 6.

The device operates as follows.

When starting the asynchronized synchronous generator, the voltage at its terminals is less than the nominal value and there is no signal at the output of the voltage meter 24. In this regard, there is a signal at the output of the first 25 of the circuit NOT, which means that the electromagnets 20 and 26 have tripped and the switches 5 and 15 are turned off, and the thyristor switch 23 is turned on, which ensures that the initial excitation generator 10 is connected to the rotor circuits of the asynchronized synchronous generator 6. Due to the fact that there is a signal at the control input of the first. 16 of the electronic key, the speed controller 14 of the drive motor is controlled by the synchronous speed controller. In this case, the regulator 14 ensures that the uncoupling clutch 7 is turned on and the generator 6 is turned with the drive motor 9 to a synchronous speed. The excitation of the generator 6 is carried out from the initial excitation generator 10, the output voltage of which increases as the speed of the drive motor increases. Thus, the asynchronized synchronous generator 6 is brought into synchronous operation, in which the circuits of its rotor are powered by the direct current voltage generated by the initial excitation generator 10. When the rated voltage appears on the terminals of the generator 6, a signal appears at the output of the voltage meter 24, the electromagnet 37 for turning on the switch 15 of the frequency converter 12 is activated, the one-shot 38 is started, the speed controller 14 of the drive motor is transferred to the control from the function of the frequency setter 19 rotation, and the rotor circuit of the generator 6

they begin to receive power from the output of the frequency converter 12. The control of the frequency converter 12 is carried out by the controller 13, which, depending on

whether the network input is turned on or not changes the operating mode of the frequency converter 12. If the network input is turned off, there is no signal at the output of the zero-organ 27 and the regulator 13 is controlled through the third 32 electronic key 0 by an autonomous generator 31 of the generated current frequency. If the network input is turned on, there is a signal at the output of the null-organ 27, the autonomous controller 31 is turned off, and the controller 13 is controlled by the network generator 29 of the frequency of the generated current and the network controller 30 of the rotor speed of the generator rotor. After a time equal to the response time of the single vibrator 38, a signal appears at the input of the electromagnet

0 36 and the switch 5 of the generator 6 is turned on. The time delay and the inclusion of the switch 5 of the generator 6 is necessary to put the generator b in synchronous and in-phase with respect to the voltage

5 bus power supply 4 state, i.e. in a state in which the inclusion of the generator 6 in parallel operation is carried out without a voltage drop and without surge surge

0 between the generator and the buses. If there is a voltage at the mains input, the generator 6 goes into motor mode. This fact is recorded by the finder 39, which disables the drive motor controller 14

5 9. Turning off the regulator 14 will ensure that the fuel supply to the engine 9 is cut off, the uncoupling clutch 8 is turned off and the drive motor is stopped.

When the generator 6 is operating in the engine mode, the frequency of rotation of its shaft is regulated depending on the load of the guaranteed power supply system. Changing the frequency of rotation of the shaft is carried out by changing the frequency of the current in its circuit

5 inductors. The choice of the speed value is made in such a way that at a given value of the load of the guaranteed power system would be greater than the value of the speed in the stand-alone

0 operating mode and similar load by an amount equal to a decrease in the rotational speed during the start-up of the drive motor. The magnitude of the current amplitude and the phase of the resulting field in the inductor circuit are determined by the reactive load of the guaranteed power buses.

The present invention allows, in contrast to the prototype, to provide functional regulation of the magnitude of the amplitude and frequency of the current in the circuit of the inductor ASG at

changing the load of the guaranteed power supply system, which helps to improve the quality of electric energy in dynamic operating modes while maintaining the optimal ratio between the power generated by the generator and the fuel consumed by the engine.

The technical advantages of the invention in comparison with the prototype are that the guaranteed power supply system is prepared to receive the load in the event of a loss of mains input voltage / the process of switching to stand-alone operation is not accompanied by disturbances, which avoids degradation of quality indicators in dynamic modes electrical energy. The power required to power the rotor circuits of an asynchronous synchronous generator substantially depends on the load condition and rotor speed.

From the data given in the table, it follows that for idle mode and synchronous speed of the generator rotor, the power required to provide excitation is minimal.

Obviously, to excite the generator in idle mode at a synchronous speed of its shaft n 1500, it is possible to use the initial excitation generator. For this purpose, it is necessary that the generator switch and the frequency converter switch are turned off, and the generator rotor rotates at a synchronous speed.

Claims (1)

The reliability of the object of the invention is confirmed by the following considerations. According to the proposed method, it is possible to maintain a functional dependence of the rotational speed of the shaft of an asynchronous synchronous generator, the magnitude of the current and the resulting phase of the field in the circuit of its inductor on the active and reactive load of the guaranteed power system. At the same time, the system is prepared for the possible disappearance of the voltage of the mains input, which means that the dynamic modes of the system will not be accompanied by a deterioration in the quality of electric energy on the guaranteed power buses. SUMMARY OF THE INVENTION A method for controlling a guaranteed diesel-inertia power unit with an asynchronous synchronous electric machine, which measures the magnitude and frequency of voltage on the guaranteed power buses, the magnitude and frequency of voltage on the stator main terminals of an asynchronous synchronous electric machine, and the rotational speed of the asynchronous synchronous synchronous machine electric machine and measure the frequency the amplitude of the current and the phase of the resulting field of excitation of the rotor so that the asynchronized synchronous electric machine operates in a motor mode, characterized in that, for the purpose of improving the quality of electric energy in the dynamic modes of the guaranteed power supply system, additionally measure the values of active power on the guaranteed power tires, the previously measured values of the rotor speed, the inertial mass of the rotor and the flywheel calculate the value of the energy stored by the aggregate, according to the specified values of time providing guaranteed power when disconnecting guaranteed external power from the bus, starting the drive motor, and turning on the coupling connecting Howick shaft driving motor, and the measured value active power on the guaranteed power buses calculate the amount of energy required for the specified supply, compare the amount of energy stored by the unit with the required the obtained value is determined by the expected value of the frequency change at the terminals of the core circuit of an asynchronous synchronous electric machine and the frequency of the rotor field of the asynchronous synchronous electric machine is changed by the obtained value, and then the current amplitude and phase of the resulting rotor excitation field are changed to obtain the nominal voltage value. The dependence of the parameters of the circuit of the rotor of the generator on the speed and load conditions