Three-phase electric ring power supply experimental device

Abstract

The present invention relates to a three-phase electric closed-loop power supply experimental device, comprising: a motor, which is used to rotate under the action of a driving control signal; a generator, the rotating shaft of the generator is mechanically connected to the rotating shaft of the motor, and is used to output three-phase electricity driven by the rotation of the motor; a control board, the control board includes a first setting unit and a control unit, the control unit is electrically connected to the first setting unit and the motor respectively, the first setting unit is used to receive a three-phase electricity target value input by a user, and the control unit is used to generate a driving control signal according to the three-phase electricity target value to drive the motor to rotate until the three-phase electricity meets the three-phase electricity target value. When conducting training, two three-phase electric closed-loop power supply experimental devices can be used for training, without the need to use actual power supply equipment, which can not only effectively reduce training costs and improve training safety, but also trainees can perform operations repeatedly, greatly improving the quality and effect of training.

Description

Technical Field

[0001] The invention relates to the technical field of power distribution detection, in particular to a three-phase electric ring-circuit power supply experimental device. Background Art

[0002] In the power distribution system, when a power line fails or the required capacity increases, the distribution network needs to switch the power supply line. Before switching the power supply line, the phase of the two three-phase power supply lines needs to be confirmed, that is, the three phases A, B and C need to be judged, and the frequency and phase angle of the two three-phase power supply lines need to be tested. When the phase, frequency and phase angle meet the conditions, the two three-phase ring-to-ring power supplies can be combined, otherwise the power equipment will be damaged, causing power failures, and even serious personal safety. Therefore, the operators of the three-phase ring-to-ring power supply must undergo pre-job training, but due to the high voltage and large size of the actual power supply equipment, the training brings many inconveniences. Summary of the invention

[0003] Based on this, it is necessary to provide a three-phase electric ring-circuit power supply experimental device to address the problem of difficulty in pre-job training for three-phase ring-circuit power supply operators due to the shortcomings of actual power supply equipment such as high voltage and large size.

[0004] A three-phase electric ring-circuit power supply experimental device, comprising:

[0005] A motor, configured to rotate under the action of a drive control signal;

[0006] A generator, the rotating shaft of the generator is mechanically connected to the rotating shaft of the motor, and is used to output three-phase electricity driven by the rotation of the motor;

[0007] The control board includes a first setting unit and a control unit. The control unit is electrically connected to the first setting unit and the motor respectively. The first setting unit is used to receive the three-phase electricity target value input by the user. The control unit is used to generate a drive control signal according to the three-phase electricity target value to drive the motor to rotate until the three-phase electricity meets the three-phase electricity target value.

[0008] In one embodiment, the control board further includes a motor drive unit, which is electrically connected to the control unit and the motor, respectively, and is used to drive and control the motor according to a drive control signal to rotate the motor.

[0009] In one embodiment, the motor drive unit comprises:

[0010] A first resistor, one end of which is electrically connected to the control unit;

[0011] A first switch tube, a control end of the first switch tube is electrically connected to the other end of the first resistor, a first end of the first switch tube is electrically connected to a first preset power supply, and a second end of the first switch tube is electrically connected to the motor.

[0012] In one embodiment, the control panel further comprises:

[0013] A voltage detection unit, the voltage detection unit is electrically connected to the generator and is used to detect the voltage of the three-phase electricity;

[0014] A frequency detection unit, the frequency detection unit is electrically connected to the generator and is used to detect the frequency of the three-phase electricity;

[0015] The control unit is also electrically connected to the voltage detection unit and the frequency detection unit respectively, and is used to generate a driving control signal according to the three-phase electricity target value, the voltage of the three-phase electricity and the frequency of the three-phase electricity.

[0016] In one embodiment, the voltage detection unit includes:

[0017] A rectifier circuit, wherein an input end of the rectifier circuit is electrically connected to an output end of the generator and is used to rectify the three-phase electricity to obtain a first direct current;

[0018] A filter circuit, wherein an input end of the filter circuit is electrically connected to an output end of the rectifier circuit, and is used to filter the first direct current to obtain a second direct current;

[0019] A voltage divider circuit, wherein the input end of the voltage divider circuit is electrically connected to the output end of the filter circuit, and the output end of the voltage divider circuit is electrically connected to the control unit, for dividing the second direct current to obtain a voltage detection signal, and the control unit is also used to obtain the voltage of the three-phase electricity according to the voltage detection signal.

[0020] In one embodiment, the frequency detection unit includes:

[0021] a second resistor, one end of the second resistor being electrically connected to the output end of the generator;

[0022] A photoelectric coupler, wherein the first input terminal and the second input terminal of the photoelectric coupler are connected and then electrically connected to the other end of the second resistor, and the third input terminal and the fourth input terminal of the photoelectric coupler are connected and then grounded;

[0023] A second switch tube, wherein the control end of the second switch tube is electrically connected to the first output end of the photoelectric coupler, the first end of the second switch tube is connected to the second output end and the third output end of the photoelectric coupler and then grounded, and the second end of the second switch tube is electrically connected to the control unit;

[0024] a third resistor, one end of the third resistor being electrically connected to the first output end and the fourth output end of the photoelectric coupler respectively, and the other end of the third resistor being electrically connected to the second preset power supply;

[0025] A fourth resistor, one end of the fourth resistor is electrically connected to the second end of the second switch tube, and the other end of the fourth resistor is electrically connected to the second preset power supply.

[0026] In one of the embodiments, the first setting unit includes a voltage setting interface and / or a frequency setting interface.

[0027] In one embodiment, the control panel further includes a second setting unit, and the second setting unit includes:

[0028] A phase setting interface, used to receive a three-phase electrical phase target value input by a user;

[0029] The phase shift circuit is electrically connected to the phase setting interface and the output end of the generator, and is used to adjust the phase of the three-phase electricity according to the three-phase electricity phase target value.

[0030] In one embodiment, the phase shift circuit includes:

[0031] a second capacitor, one end of the second capacitor being electrically connected to the output end of the generator;

[0032] A comparator, wherein a first input terminal of the comparator is electrically connected to the other end of the second capacitor;

[0033] An adjustable resistor, wherein a first end of the adjustable resistor is electrically connected to a first input end of the comparator, a second end of the adjustable resistor is grounded, and an adjustment end of the adjustable resistor is electrically connected to a phase setting interface;

[0034] a fifth resistor, one end of which is grounded, and the other end of which is electrically connected to the second input end of the comparator;

[0035] A sixth resistor, one end of the sixth resistor is electrically connected to the other end of the fifth resistor, and the other end of the sixth resistor is electrically connected to the output end of the comparator.

[0036] In one embodiment, the above-mentioned device further includes: a power supply, which is electrically connected to the control board to supply power to the control board.

[0037] The above-mentioned three-phase electric closed-loop power supply experimental device receives the three-phase electric target value input by the user through the first setting unit, and generates a drive control signal according to the three-phase electric target value through the control unit. The motor rotates under the action of the drive control signal, and the generator outputs three-phase electricity driven by the rotation of the motor until the three-phase electricity meets the three-phase electric target value. When conducting training, two three-phase electric closed-loop power supply experimental devices can be used for training without using actual power supply equipment. This can not only effectively reduce training costs and improve training safety, but also trainees can perform operations repeatedly, greatly improving the quality and effect of training. BRIEF DESCRIPTION OF THE DRAWINGS

[0038] Figure 1 It is a structural schematic diagram of a three-phase electric ring-type power supply experimental device in one embodiment;

[0039] Figure 2 It is a structural schematic diagram of a three-phase electric ring-type power supply experimental device in another embodiment;

[0040] Figure 3 is a schematic structural diagram of a motor drive unit in one embodiment;

[0041] Figure 4 is a schematic structural diagram of a voltage detection unit in one embodiment;

[0042] Figure 5 is a structural schematic diagram of a frequency detection unit in one embodiment;

[0043] Figure 6 is a schematic structural diagram of a phase shift circuit in one embodiment;

[0044] Figure 7 It is a structural schematic diagram of a three-phase electric ring-type power supply experimental device in another embodiment. DETAILED DESCRIPTION

[0045] In order to make the above-mentioned objects, features and advantages of the present invention more obvious and easy to understand, the specific embodiments of the present invention are described in detail below in conjunction with the accompanying drawings. In the following description, many specific details are set forth to facilitate a full understanding of the present invention. However, the present invention can be implemented in many other ways different from those described herein, and those skilled in the art can make similar improvements without violating the connotation of the present invention, so the present invention is not limited by the specific implementation disclosed below.

[0046] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as those generally understood by those skilled in the art of the technical field of the present invention. The terms used herein in the specification of the present invention are only for the purpose of describing specific embodiments and are not intended to limit the present invention. The various technical features of the above embodiments can be combined arbitrarily. In order to make the description concise, all possible combinations of the various technical features in the above embodiments are not described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0047] Figure 1 FIG. 1 is a schematic diagram of a three-phase electric ring-type power supply experimental device in an embodiment. Figure 1 As shown, the three-phase electric ring-type power supply experimental device includes: a motor 10, a generator 20 and a control board 30.

[0048] Among them, the motor 10 is used to rotate under the action of a driving control signal; the rotating shaft of the generator 20 is mechanically connected to the rotating shaft of the motor 10, so as to output three-phase electricity driven by the rotation of the motor 10; the control board 30 includes a first setting unit 31 and a control unit 32, the control unit 32 is electrically connected to the first setting unit 31 and the motor 10 respectively, the first setting unit 31 is used to receive the three-phase electricity target value input by the user, and the control unit 32 is used to generate a driving control signal according to the three-phase electricity target value to drive the motor 10 to rotate until the three-phase electricity meets the three-phase electricity target value.

[0049] Specifically, the motor 10 can be a DC12V motor, and the generator 20 can be an AC24V three-phase micro generator. The power supply end of the motor 10 is electrically connected to the control unit 32 through a wire, and the rotating shaft of the motor 10 is mechanically connected to the rotating shaft of the generator 20 through a belt. The three-phase power A, B, C output terminals and the neutral point of the generator 20 are connected to the A, B, C phase terminals and the neutral line terminal N through wires. The terminals provide a test port for the experiment and can be connected to the test equipment or load. After the control board 30 is powered on, the first setting unit 31 receives the three-phase power target value input by the user, and sends the received three-phase power target value to the control unit 32. The control unit 32 outputs a driving control signal to the motor 10 according to the three-phase power target value to drive the motor 10 to rotate. When the motor 10 rotates, the rotating shaft of the motor 10 drives the rotor of the engine 20 to rotate, and an electromotive force is generated through an alternating electromagnetic field, and a three-phase power with a phase difference of a certain angle, such as 120°, is generated on the three-phase winding of the generator 20, and is output through the corresponding terminal. Therefore, the experimental device can output corresponding three-phase electricity according to user needs.

[0050] In the actual training process, the trainers can use the two experimental devices for training. At this time, the trainers can set the three-phase power target values ​​of the two experimental devices to be the same / different through the first setting unit 31 to obtain two identical / different three-phase powers. Then the trainees detect the output two three-phase powers and determine whether the three-phase power can be merged according to the detection results. In this way, the trainees can be trained without using actual power supply equipment, which can not only effectively reduce the training cost and improve the training safety, but also the trainees can perform the operation repeatedly, which greatly improves the quality and effect of the training.

[0051] In one embodiment, the first setting unit 31 includes a voltage setting interface and / or a frequency setting interface, wherein the voltage target value of the three-phase electricity can be set through the voltage setting interface, for example, the voltage target value of the three-phase electricity is set to 24V; the frequency target value of the three-phase electricity can be set through the frequency setting interface, for example, the frequency target value of the three-phase electricity is set to 50Hz. In practical applications, the first setting unit 31 may include a voltage setting interface and a frequency setting interface, so that the voltage target value and the frequency target value of the three-phase electricity can be set at the same time to ensure the comprehensiveness and diversity of the training.

[0052] In one embodiment, Figure 2 As shown, the control board 30 further includes a motor driving unit 33, which is electrically connected to the control unit 32 and the motor 10, respectively, for driving and controlling the motor 10 according to a driving control signal so that the motor 10 rotates.

[0053] Specifically, the control board 30 is also provided with a motor drive output interface 34, the motor drive unit 33 is electrically connected to the control unit 32 and the motor drive output interface 34 respectively, and the power supply end of the motor 10 is electrically connected to the motor drive output interface 34 through a wire. When the control unit 32 is powered on, the control unit 32 outputs a drive control signal to the motor drive unit 33 according to the set three-phase electricity target value. Under the action of the drive control signal, the motor drive unit 33 works to generate electric energy, and outputs electric energy through the motor drive output interface 34, drives the motor 10 to rotate, and then drives the generator 20 to output three-phase electricity.

[0054] In one embodiment, Figure 3 As shown, the motor drive unit 33 includes: a first resistor R1 and a first switch tube Q1, one end of the first resistor R1 is electrically connected to the control unit 32, specifically, it can be electrically connected to an I / O port of the control unit 32; the control end of the first switch tube Q1 is electrically connected to the other end of the first resistor R1, the first end of the first switch tube Q1 is electrically connected to the first preset power supply VCC1, and the second end of the first switch tube Q1 is electrically connected to the motor 10. Among them, the first switch tube Q1 can be a MOS tube, which is not specifically limited here, and when the motor 10 is a DC12V motor, the second end of the first switch tube Q1 is electrically connected to the positive pole of the motor 10, and the first preset power supply VCC1 can be a DC12V power supply.

[0055] In one embodiment, Figure 2As shown, the control board 30 also includes: a voltage detection unit 35 and a frequency detection unit 36, wherein the voltage detection unit 35 is electrically connected to the generator 20 to detect the voltage of the three-phase electricity; the frequency detection unit 36 ​​is electrically connected to the generator 20 to detect the frequency of the three-phase electricity; the control unit 32 is also electrically connected to the voltage detection unit 35 and the frequency detection unit 36 ​​respectively, to generate a drive control signal according to the three-phase electricity target value, the three-phase electricity voltage and the three-phase electricity frequency.

[0056] Specifically, the control board 30 is also provided with a three-phase electricity sampling input interface 37, and the voltage detection unit 35 and the frequency detection unit 36 ​​are electrically connected to the output end of the generator 20 through the three-phase electricity sampling input interface 37. When the control board 30 is powered on, the control unit 32 outputs a drive control signal to the motor 10 according to the set three-phase electricity target value, drives the motor 10 to rotate, and then drives the generator 20 to output three-phase electricity. At the same time, the voltage detection unit 35 detects the voltage of the three-phase electricity output by the generator 20 in real time and sends it to the control unit 32, and the frequency detection unit 36 ​​detects the frequency of the three-phase electricity output by the generator 20 in real time and sends it to the control unit 32. The control unit 32 compares the received voltage and frequency of the three-phase electricity with the set three-phase electricity target value, automatically adjusts the drive control signal, and changes the driving capacity of the motor drive unit 33 by increasing or decreasing the drive control signal, thereby changing the three-phase electricity output by the generator 20, so that the three-phase electricity output by the generator 20 is the same as the set three-phase electricity target value.

[0057] Specifically, driven by the motor 10, the time for the rotor of the engine 20 to rotate once is a period T, the frequency f is 1 / T, and the angular frequency w=2π / T=2πf. According to the formula, it can be seen that the voltage and frequency generated by the generator 20 are both proportional to the rotor speed. Therefore, by adjusting the speed of the motor 10, the voltage and frequency of the three-phase electricity generated by the generator 20 can be adjusted. Since the speed of the motor 10 is related to the strength of the drive control signal output by the control unit 32, the three-phase electricity output by the generator 20 can be changed by increasing or decreasing the drive control signal to change the driving ability of the motor drive unit 33. For example, when the drive control signal is enhanced, the driving ability of the motor drive unit 33 increases, the speed of the generator 20 increases, and the output voltage and frequency of the three-phase electricity increase; when the drive control signal is weakened, the driving ability of the motor drive unit 33 decreases, the speed of the generator 20 decreases, and the output voltage and frequency of the three-phase electricity decrease. Then, the above process is repeated to make the three-phase electricity output by the generator 20 the same as the set three-phase electricity target value.

[0058] In one embodiment, Figure 4As shown, the voltage detection unit 35 includes: a rectifier circuit 351, a filter circuit 352 and a voltage divider circuit 353, wherein the input end of the rectifier circuit 351 is electrically connected to the output end of the generator 20, so as to rectify the three-phase electricity to obtain a first direct current; the input end of the filter circuit 352 is electrically connected to the output end of the rectifier circuit 351, so as to filter the first direct current to obtain a second direct current; the input end of the voltage divider circuit 353 is electrically connected to the output end of the filter circuit 352, and the output end of the voltage divider circuit 353 is electrically connected to the control unit 32, so as to divide the second direct current to obtain a voltage detection signal, and the control unit 32 is also used to obtain the voltage of the three-phase electricity according to the voltage detection signal.

[0059] Specifically, the rectifier circuit 351 can be a single-phase rectifier circuit, and its input end is electrically connected to any phase (such as phase A, phase B or phase C) of the generator 20 and the ground, so as to rectify the alternating current output by the generator 20 to obtain the first direct current. The filter circuit 352 can be a capacitor type, LC type, LCL type and π type filter circuit, and its input end is electrically connected to the output end of the rectifier circuit 351, so as to filter the first direct current to obtain a stable direct current. The voltage divider circuit 353 can be composed of two resistors connected in series, and the two ends of the series connection are electrically connected to the output end of the filter circuit 352, and the series connection point is electrically connected to the control unit 32. The control unit 32 obtains the voltage of the series connection point and converts the voltage to obtain the voltage of the three-phase electricity output by the generator 20.

[0060] In one embodiment, Figure 5 As shown, the frequency detection unit 36 ​​includes: a second resistor R2, a photocoupler U, a second switch tube Q2, a third resistor R3 and a fourth resistor R4. Among them, one end of the second resistor R2 is electrically connected to the output end of the generator 20, specifically to any phase (such as phase A, phase B or phase C) of the generator 20; the first input end and the second input end of the photoelectric coupler U are connected and then electrically connected to the other end of the second resistor R2, and the third input end and the fourth input end of the photoelectric coupler U are connected and then grounded; the control end of the second switch tube Q2 (such as a MOS tube) is electrically connected to the first output end of the photoelectric coupler U, the first end of the second switch tube Q2 is connected to the second output end and the third output end of the photoelectric coupler U and then grounded, and the second end of the second switch tube Q2 is electrically connected to the control unit 32; one end of the third resistor R3 is electrically connected to the first output end and the fourth output end of the photoelectric coupler U respectively, and the other end of the third resistor R3 is electrically connected to the second preset power supply VCC2 (such as a DC5V power supply); one end of the fourth resistor R4 is electrically connected to the second end of the second switch tube Q2, and the other end of the fourth resistor R4 is electrically connected to the second preset power supply VCC2.

[0061] In one embodiment, Figure 2As shown, the control panel 30 also includes a second setting unit 38, which includes: a phase setting interface 381 and a phase shift circuit 382. The phase setting interface 381 is used to receive the three-phase electricity phase target value input by the user; the phase shift circuit 382 is electrically connected to the phase setting interface 381 and the output end of the generator 20, and is used to adjust the phase of the three-phase electricity according to the three-phase electricity phase target value. In other words, the user can set the phase target value of the three-phase electricity through the phase setting interface and the phase shift circuit. For example, the set phase target value can be 110°. In actual use, a second setting unit 38 can be set for each phase of the three-phase electricity output by the engine 20 to adjust the phase of the three-phase electricity.

[0062] In one embodiment, Figure 6 As shown, the phase shift circuit 382 includes: a second capacitor C2, a comparator K, an adjustable resistor R, a fifth resistor R5 and a sixth resistor R6. Among them, one end of the second capacitor C2 is electrically connected to the output end of the generator 20; the first input end of the comparator K is electrically connected to the other end of the second capacitor C2; the first end of the adjustable resistor R is electrically connected to the first input end of the comparator K, the second end of the adjustable resistor R is grounded, and the adjustment end of the adjustable resistor R is electrically connected to the phase setting interface 381; one end of the fifth resistor R5 is grounded, and the other end of the fifth resistor R5 is electrically connected to the second input end of the comparator K; one end of the sixth resistor R6 is electrically connected to the other end of the fifth resistor R5, and the other end of the sixth resistor R6 is electrically connected to the output end of the comparator K. In actual use, one end of the second capacitor C2 is electrically connected to any phase (such as phase A, phase B or phase C) of the generator 20, and the output end of the comparator K is also electrically connected to the phase, that is, the phase shift circuit 382 is connected in series in any phase line of the output end of the generator 20, and the user adjusts the phase of the phase electricity by adjusting the resistance value of the adjustable resistor R through the phase setting interface 381.

[0063] In one embodiment, Figure 7 As shown, the above-mentioned three-phase electric ring-type power supply experimental device also includes: a power supply 40, which is electrically connected to the control board 30 to supply power to the control board 30. Specifically, the power supply 40 can be an independent power supply, such as a DC12V battery, and the entire control board 30 is powered by the independent power supply and the power input interface 39 on the control board 30; the power supply 40 can also be an AC / DC converter, whose input end is connected to the mains to convert the AC mains into the DC power required by the control board 30. The specific method can be selected according to actual needs.

[0064] In one embodiment, Figure 7As shown, the above-mentioned three-phase electric ring-circuited power supply experimental device also includes: a box 50, and the entire experimental device is arranged in the box 50, which not only ensures the aesthetics of the experimental device, but also avoids the risk of electric shock during training.

[0065] Specifically, in this embodiment, the three-phase electric ring-type power supply experimental device may include five parts: a motor 10, a generator 20, a control board 30, a power supply 40, and a box 50. Among them, the motor 10 may be a DC12V motor, which is fixed inside the box 50 by screws, and the generator 20 may be an AC24V three-phase micro generator, which is fixed inside the box 50 by screws, and the rotating shaft of the motor 10 is connected to the rotating shaft of the generator 20 by a belt. The control board 30 is provided with a control unit 32 (such as a control chip), a motor drive unit 33, a motor drive output interface 34, a voltage detection unit 35, a frequency detection unit 36, a three-phase electric sampling input interface 37, a first setting unit 31, a second setting unit 38, and a power input interface 39. The motor 10 is also connected to the motor drive output interface 34 by a wire, and the output end of the generator 20 is also connected to the three-phase electric sampling input interface 37 by a wire. The power supply 40 can be a DC12V battery, which is fixed in the box 50 by screws, and the positive and negative electrodes are connected to the power input interface 39 of the control board 30 by wires to provide power for the entire experimental device. The box 50 is provided with a setting button corresponding to the first setting unit 31 (used to set the voltage and frequency of the three-phase electricity), a setting knob corresponding to the second setting unit 38 (used to set the phase of the three-phase electricity), a power switch, and A, B, C phase terminals and a neutral line terminal N corresponding to the output end of the generator 20.

[0066] In actual use, the trainer can first set the voltage (such as 24V) and frequency (such as 50Hz) of the three-phase electricity through the setting button on the box 50, and set the phase (such as 120°) of the three-phase electricity through the setting knob, and then turn on the power switch on the box 50. At this time, the power supply 40 supplies power to the control panel 30. After the control unit 32 on the control panel 30 is powered on, it starts to run according to the pre-programmed program. Specifically, it can first output a drive control signal to the motor drive unit 33 according to the set voltage and frequency. The motor drive unit 33 generates electric energy and outputs electric energy through the motor drive output interface 34 to drive the motor 10 to rotate. When the motor 10 rotates, the rotating shaft of the motor 10 drives the rotor of the engine 20 to rotate, and an electromotive force is generated through the alternating electromagnetic field, and three-phase electricity is generated on the three-phase winding of the generator 20. At the same time, the voltage detection unit 35 and the frequency detection unit 36 ​​detect the voltage and frequency of the three-phase electricity output by the generator 20 in real time, and send them to the control unit 32. The control unit 32 compares the received voltage and frequency with the set voltage (such as 24V) and frequency (such as 50Hz), and automatically adjusts the drive control signal of the motor 10, such as increasing or decreasing the drive control signal to change the driving capacity of the motor drive unit 33, until the detected voltage and frequency of the three-phase electricity are the same as the set voltage (such as 24V) and frequency (such as 50Hz).

[0067] When the trainers are training the trainees, the above two experimental devices can be used for training. During the training, the voltage of the three-phase electricity output by the generator 20 of one of the experimental devices can be set to 24V and the frequency can be set to 50Hz, and the voltage of the other can be set to 12V and the frequency can be set to 25Hz, so as to obtain two different three-phase electricity for the trainees to test. Then the trainees test the two three-phase electricity to determine whether the two three-phase electricity can be merged. In this example, it is obvious that the two three-phase electricity cannot be merged. In addition, the trainers can also set the phase of the three-phase electricity output by the generator 20 of one of the experimental devices to 120° and the phase of the other to 110°, and the trainees can also test to determine whether the two three-phase electricity can be merged. In this example, it is obvious that the two three-phase electricity cannot be merged. In addition, the three-phase electricity commonly used is symmetrical three-phase electricity, and its instantaneous expression is shown in the following formula:

[0068]

[0069] It can be seen from the above formula that the maximum values ​​of the symmetrical three-phase electricity output by the motor 20 are equal, the frequency is the same, and the phase difference is 120°, that is, the sum of the instantaneous values ​​of the symmetrical three-phase electricity is 0 (e A +e B +e C=0), so according to this principle, a three-phase load imbalance experiment can be carried out, such as connecting the three-phase electricity to loads of different powers respectively, so that the voltage on the neutral line is not 0, and then the trainees conduct the test. If the three-phase electricity is unbalanced, the two three-phase electricity cannot be combined. Therefore, the three-phase power supply experimental device of the present application can be used to train the three-phase power supply operators without using the actual power supply equipment, and the trainees can perform the operation repeatedly, which greatly improves the quality and effect of the training.

[0070] The above-mentioned three-phase electric closed-loop power supply experimental device receives the three-phase electric target value input by the user through the first setting unit, and generates a drive control signal according to the three-phase electric target value through the control unit. The motor rotates under the action of the drive control signal, and the generator outputs three-phase electricity driven by the rotation of the motor until the three-phase electricity meets the three-phase electric target value. When conducting training, two three-phase electric closed-loop power supply experimental devices can be used for training without using actual power supply equipment. This can not only effectively reduce training costs and improve training safety, but also trainees can perform operations repeatedly, greatly improving the quality and effect of training.

[0071] The technical features of the above-described embodiments may be arbitrarily combined. To make the description concise, not all possible combinations of the technical features in the above-described embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0072] The above-mentioned embodiments only express several implementation methods of the present invention, and the descriptions thereof are relatively specific and detailed, but they cannot be understood as limiting the scope of the invention patent. It should be pointed out that, for ordinary technicians in this field, several variations and improvements can be made without departing from the concept of the present invention, and these all belong to the protection scope of the present invention. Therefore, the protection scope of the patent of the present invention shall be subject to the attached claims.

Claims

1. A three-phase electric ring power supply experimental device, characterized in that: include: A motor, configured to rotate under the action of a drive control signal; A generator, the rotating shaft of the generator is mechanically connected to the rotating shaft of the motor, and is used to output three-phase electricity under the rotation of the motor; A control panel, the control panel comprising a first setting unit and a control unit, the control unit being electrically connected to the first setting unit and the motor respectively, the first setting unit being used to receive a three-phase electricity target value input by a user, the control unit being used to generate the drive control signal according to the three-phase electricity target value to drive the motor to rotate until the three-phase electricity meets the three-phase electricity target value; the first setting unit is also used to set the three-phase electricity target values ​​of two three-phase electricity closing and ring-turning power supply experimental devices to be the same / different, so as to obtain two identical / different three-phase electricity, the two identical / different three-phase electricity being used to determine whether the three-phase electricity can be merged; The control panel also includes: a voltage detection unit, the voltage detection unit being electrically connected to the generator and configured to detect the voltage of the three-phase electricity; a frequency detection unit, the frequency detection unit being electrically connected to the generator and configured to detect the frequency of the three-phase electricity; The control unit is also electrically connected to the voltage detection unit and the frequency detection unit respectively, and is used to generate the drive control signal according to the three-phase power target value, the voltage of the three-phase power and the frequency of the three-phase power; The control panel further includes a second setting unit, wherein the second setting unit includes: A phase setting interface, used to receive a three-phase electrical phase target value input by a user; a phase shifting circuit, the phase shifting circuit being electrically connected to the phase setting interface and the output end of the generator, and being used to adjust the phase of the three-phase electricity according to the three-phase electricity phase target value; Wherein, the phase shift circuit comprises: a second capacitor, one end of which is electrically connected to the output end of the generator; a comparator, wherein a first input terminal of the comparator is electrically connected to the other end of the second capacitor; An adjustable resistor, wherein a first end of the adjustable resistor is electrically connected to the first input end of the comparator, a second end of the adjustable resistor is grounded, and an adjustment end of the adjustable resistor is electrically connected to the phase setting interface; a fifth resistor, one end of which is grounded, and the other end of which is electrically connected to the second input end of the comparator; A sixth resistor, one end of the sixth resistor is electrically connected to the other end of the fifth resistor, and the other end of the sixth resistor is electrically connected to the output end of the comparator.

2. The device according to claim 1, characterized in that The control board further includes a motor driving unit, which is electrically connected to the control unit and the motor respectively, and is used to drive and control the motor according to the driving control signal so as to rotate the motor.

3. The device according to claim 2, characterized in that The motor drive unit comprises: a first resistor, one end of which is electrically connected to the control unit; A first switch tube, wherein a control end of the first switch tube is electrically connected to the other end of the first resistor, a first end of the first switch tube is electrically connected to a first preset power supply, and a second end of the first switch tube is electrically connected to the motor.

4. The device according to claim 1, characterized in that The voltage detection unit comprises: a rectifier circuit, wherein an input end of the rectifier circuit is electrically connected to an output end of the generator, and is used to rectify the three-phase electricity to obtain a first direct current; a filter circuit, wherein an input end of the filter circuit is electrically connected to an output end of the rectifier circuit, and is used to filter the first direct current to obtain a second direct current; A voltage divider circuit, wherein the input end of the voltage divider circuit is electrically connected to the output end of the filter circuit, and the output end of the voltage divider circuit is electrically connected to the control unit, for dividing the second direct current to obtain a voltage detection signal, and the control unit is also used to obtain the voltage of the three-phase electricity according to the voltage detection signal.

5. The device according to claim 1, characterized in that The frequency detection unit comprises: a second resistor, one end of which is electrically connected to the output end of the generator; A photoelectric coupler, wherein a first input terminal and a second input terminal of the photoelectric coupler are connected to each other and then electrically connected to the other end of the second resistor, and a third input terminal and a fourth input terminal of the photoelectric coupler are connected to each other and then grounded; a second switch tube, wherein the control end of the second switch tube is electrically connected to the first output end of the photoelectric coupler, the first end of the second switch tube is connected to the second output end and the third output end of the photoelectric coupler and then grounded, and the second end of the second switch tube is electrically connected to the control unit; a third resistor, one end of the third resistor being electrically connected to the first output end and the fourth output end of the photoelectric coupler respectively, and the other end of the third resistor being electrically connected to a second preset power supply; a fourth resistor, one end of the fourth resistor being electrically connected to the second end of the second switch tube, and the other end of the fourth resistor being electrically connected to the second preset power supply.

6. The device according to claim 1, characterized in that The first setting unit includes a voltage setting interface and / or a frequency setting interface.

7. The device according to any one of claims 1 to 6, characterized in that The device also includes: a power supply, which is electrically connected to the control board to supply power to the control board.

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