CN115078856A - Resistive load selection method and device for three-phase alternating current phase sequence detection circuit - Google Patents
Resistive load selection method and device for three-phase alternating current phase sequence detection circuit Download PDFInfo
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Abstract
The invention discloses a resistive load selection method and a resistive load selection device for a three-phase alternating current phase sequence detection circuit, wherein the method comprises the following steps: obtaining a power supply phase voltage, a reactance ratio parameter value and incandescent lamp power of a three-phase alternating current phase sequence detection circuit, wherein each incandescent lamp is respectively connected with a resistive load with the same resistance value in series; calculating the equivalent rated resistance of the incandescent lamp according to the power item voltage and the incandescent lamp power; calculating three-phase load voltage according to the reactance ratio parameter value and the power supply phase voltage; setting the resistance value of the resistive load, calculating the voltage at two ends of each incandescent lamp, comparing the three-phase load voltage and the voltage at two ends of each incandescent lamp with a preset load voltage parameter value, and if the three-phase load voltage or the voltage at two ends of any incandescent lamp exceeds the preset load voltage parameter value, resetting the resistance value of the resistive load until the voltage at two ends of each incandescent lamp does not exceed the preset load voltage parameter value. The invention ensures that the working voltage of the equipment meets the long-term working requirement, and realizes safety and stability.
Description
Technical Field
The invention relates to the technical field of three-phase alternating current, in particular to a resistive load selection method and a resistive load selection device for a three-phase alternating current phase sequence detection circuit.
Background
This section is intended to provide a background or context to the embodiments of the invention that are recited in the claims. The description herein is not admitted to be prior art by inclusion in this section.
The alternating current power system is provided with three conducting wires which are divided into ABC three phases, and under the normal condition, the three phases of voltage and current are symmetrical, and the phase difference is 120 degrees. When the system fails, the ABC three phases are not symmetrical any more, and the voltage and the current can be decomposed into three components of positive sequence, negative sequence and zero sequence for convenient analysis. The phase sequence of the three electromotive forces U-V-W-U is called a positive phase sequence, if the rotor of the generator rotates anticlockwise, the phase sequence of the three electromotive forces is opposite, namely U-W-V-U, and the phase sequence is called a negative phase sequence. The phase sequence problem needs to be considered when the three-phase motor is connected with a power supply. In order to facilitate daily electricity utilization, a factory and a workshop substation, three distribution buses are respectively coated with yellow, green and red colors for respectively representing U, V, W three phases.
In the existing three-phase alternating current phase sequence detection, 1 capacitor and 2 incandescent lamps are used as temporary loads, and the existing three-phase alternating current phase sequence detection is connected with an existing power grid by adopting a star connection method, as shown in fig. 2. When the phase sequence of the three-phase power supply is judged, if one phase connected with a capacitor is taken as an A phase, the voltage of the B phase is higher than that of the C phase, a lamp of the B phase is brighter, and the C phase is darker (positive sequence). Among them, the requirement that the capacitance and the reactance are consistent with the resistance needs to be satisfied. However, in actual work and life, the resistance value of the incandescent lamp is only about 10 steps, and the capacitance value of the capacitor is discontinuous, so that the capacitor cannot be selected arbitrarily, and the requirements on the working safety and stability of equipment are difficult to meet.
Therefore, a three-phase ac phase sequence detection circuit scheme that can overcome the above problems is needed.
Disclosure of Invention
The embodiment of the invention provides a resistive load selection method of a three-phase alternating current phase sequence detection circuit, which is used for selecting the resistive load of the three-phase alternating current phase sequence detection circuit, ensuring that the working voltage of equipment meets the long-term working requirement and realizing the safety and the stability, and comprises the following steps:
obtaining a power supply phase voltage, a reactance ratio parameter value and incandescent lamp power of a three-phase alternating current phase sequence detection circuit, wherein each incandescent lamp of the three-phase alternating current phase sequence detection circuit is respectively connected with a resistive load with the same resistance value in series;
calculating the equivalent rated resistance of the incandescent lamp according to the power item voltage and the incandescent lamp power;
calculating three-phase load voltage according to the reactance ratio parameter value and the power supply phase voltage;
setting the resistance value of the resistive load, calculating the voltage at two ends of each incandescent lamp according to the resistance value of the resistive load, the equivalent rated resistance of each incandescent lamp and the three-phase load voltage, respectively comparing the three-phase load voltage and the voltage at two ends of each incandescent lamp with a preset load voltage parameter value, resetting the resistance value of the resistive load if the three-phase load voltage or the voltage at two ends of any incandescent lamp exceeds the preset load voltage parameter value, and calculating the voltage at two ends of each incandescent lamp according to the reset resistance value of the resistive load and the equivalent rated resistance of each incandescent lamp until the voltage at two ends of each incandescent lamp does not exceed the preset load voltage parameter value.
The embodiment of the invention provides a resistive load selection device of a three-phase alternating current phase sequence detection circuit, which is used for selecting the resistive load of the three-phase alternating current phase sequence detection circuit, ensuring that the working voltage of equipment meets the long-term working requirement and realizing the safety and the stability, and comprises the following components:
the voltage power parameter obtaining module is used for obtaining a power supply phase voltage, a reactance ratio parameter value and incandescent lamp power of the three-phase alternating current phase sequence detection circuit, wherein each incandescent lamp of the three-phase alternating current phase sequence detection circuit is respectively connected with a resistive load with the same resistance value in series;
the incandescent lamp equivalent rated resistance calculation module is used for calculating the incandescent lamp equivalent rated resistance according to the power supply item voltage and the incandescent lamp power;
the three-phase load voltage calculation module is used for calculating three-phase load voltage according to the reactance ratio parameter value and the power supply phase voltage;
and the resistive load resistance value determining module is used for setting the resistance value of the resistive load, calculating the voltage at two ends of each incandescent lamp according to the resistance value of the resistive load, the equivalent rated resistance of each incandescent lamp and the three-phase load voltage, respectively comparing the three-phase load voltage and the voltage at two ends of each incandescent lamp with a preset load voltage parameter value, resetting the resistance value of the resistive load if the three-phase load voltage or the voltage at two ends of any incandescent lamp exceeds the preset load voltage parameter value, and calculating the voltage at two ends of each incandescent lamp according to the reset resistance value of the resistive load and the equivalent rated resistance of each incandescent lamp until the voltage at two ends of each incandescent lamp does not exceed the preset load voltage parameter value.
The embodiment of the invention also provides computer equipment which comprises a memory, a processor and a computer program which is stored on the memory and can be run on the processor, wherein the processor executes the computer program to realize the resistive load selection method of the three-phase alternating current phase sequence detection circuit.
The embodiment of the invention also provides a computer-readable storage medium, wherein a computer program is stored in the computer-readable storage medium, and when the computer program is executed by a processor, the resistive load selection method of the three-phase alternating current phase sequence detection circuit is realized.
The embodiment of the invention also provides a computer program product, which comprises a computer program, and when the computer program is executed by a processor, the resistive load selection method of the three-phase alternating current phase sequence detection circuit is realized.
The method comprises the steps of obtaining a power supply phase voltage, a reactance ratio parameter value and incandescent lamp power of a three-phase alternating current phase sequence detection circuit, wherein each incandescent lamp of the three-phase alternating current phase sequence detection circuit is respectively connected with a resistive load with the same resistance value in series; calculating the equivalent rated resistance of the incandescent lamp according to the power item voltage and the incandescent lamp power; calculating three-phase load voltage according to the reactance ratio parameter value and the power supply phase voltage; setting the resistance value of the resistive load, calculating the voltage at two ends of each incandescent lamp according to the resistance value of the resistive load, the equivalent rated resistance of each incandescent lamp and the three-phase load voltage, respectively comparing the three-phase load voltage and the voltage at two ends of each incandescent lamp with a preset load voltage parameter value, resetting the resistance value of the resistive load if the three-phase load voltage or the voltage at two ends of any incandescent lamp exceeds the preset load voltage parameter value, and calculating the voltage at two ends of each incandescent lamp according to the reset resistance value of the resistive load and the equivalent rated resistance of each incandescent lamp until the voltage at two ends of each incandescent lamp does not exceed the preset load voltage parameter value. In the embodiment of the invention, each incandescent lamp of the three-phase alternating current phase sequence detection circuit is respectively connected with a resistive load with the same resistance value in series, and the resistance value of the resistive load is set so that the corresponding three-phase load voltage and the voltage at the two ends of each incandescent lamp do not exceed the preset load voltage parameter value, if the three-phase load voltage or the voltage at the two ends of any incandescent lamp exceed the preset load voltage parameter value, the resistive load is reset until the voltage across each incandescent lamp does not exceed the preset load voltage parameter value, therefore, the determined resistance value of the resistive load of the three-phase alternating current phase sequence detection circuit can effectively ensure that the working voltage of the equipment meets the long-term working requirement, under the condition of meeting the requirement that the brightness difference of the incandescent lamp is large enough, the requirement that human eyes can normally distinguish is realized, the equipment can work safely and stably for a long time, and the product adaptability is strong.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the drawings without creative efforts. In the drawings:
fig. 1 is a schematic diagram of a resistive load selection method of a three-phase alternating current phase sequence detection circuit according to an embodiment of the present invention;
FIG. 2 is a schematic wiring diagram of a conventional three-phase AC phase sequence detection circuit;
FIG. 3 is a schematic wiring diagram of a three-phase AC phase sequence detection circuit according to an embodiment of the present invention;
FIG. 4 is a graph of reactance ratio parameter k versus the ratio z of phase B load voltage to phase C load voltage in accordance with the present invention;
fig. 5 is a diagram of the relationship between three-phase load voltage and reactance ratio k according to the present invention.
Fig. 6 is a flow chart of resistive load selection of a three-phase ac phase sequence detection circuit according to an embodiment of the present invention;
fig. 7 is a structural diagram of a resistive load selection device of a three-phase alternating current phase sequence detection circuit in the embodiment of the present invention;
fig. 8 is a schematic structural diagram of a computer device according to an embodiment of the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present invention more apparent, the embodiments of the present invention are further described in detail below with reference to the accompanying drawings. The exemplary embodiments and descriptions of the present invention are provided to explain the present invention, but not to limit the present invention.
In order to select a resistive load of a three-phase alternating current phase sequence detection circuit, ensure that the working voltage of equipment meets the long-term working requirement, and realize safety and stability, an embodiment of the present invention provides a resistive load selection method of a three-phase alternating current phase sequence detection circuit, as shown in fig. 1, the method may include:
101, obtaining a power supply phase voltage, a reactance ratio parameter value and incandescent lamp power of a three-phase alternating current phase sequence detection circuit, wherein each incandescent lamp of the three-phase alternating current phase sequence detection circuit is respectively connected with a resistive load with the same resistance value in series;
102, calculating the equivalent rated resistance of the incandescent lamp according to the voltage of the power supply item and the power of the incandescent lamp;
103, calculating three-phase load voltage according to the reactance ratio parameter value and the power supply phase voltage;
and 104, setting the resistance value of the resistive load, calculating the voltage at two ends of each incandescent lamp according to the resistance value of the resistive load, the equivalent rated resistance of each incandescent lamp and the three-phase load voltage, respectively comparing the three-phase load voltage and the voltage at two ends of each incandescent lamp with a preset load voltage parameter value, resetting the resistance value of the resistive load and calculating the voltage at two ends of each incandescent lamp according to the reset resistance value of the resistive load and the equivalent rated resistance of each incandescent lamp until the voltage at two ends of each incandescent lamp does not exceed the preset load voltage parameter value if the three-phase load voltage or the voltage at two ends of any incandescent lamp exceeds the preset load voltage parameter value.
As shown in fig. 1, the embodiment of the present invention obtains the mains phase voltage, the reactance ratio parameter value and the incandescent lamp power of the three-phase alternating current phase sequence detection circuit, wherein each incandescent lamp of the three-phase alternating current phase sequence detection circuit is respectively connected in series with a resistive load with the same resistance value; calculating the equivalent rated resistance of the incandescent lamp according to the power item voltage and the incandescent lamp power; calculating three-phase load voltage according to the reactance ratio parameter value and the power supply phase voltage; setting the resistance value of the resistive load, calculating the voltage at two ends of each incandescent lamp according to the resistance value of the resistive load, the equivalent rated resistance of each incandescent lamp and the three-phase load voltage, respectively comparing the three-phase load voltage and the voltage at two ends of each incandescent lamp with a preset load voltage parameter value, resetting the resistance value of the resistive load if the three-phase load voltage or the voltage at two ends of any incandescent lamp exceeds the preset load voltage parameter value, and calculating the voltage at two ends of each incandescent lamp according to the reset resistance value of the resistive load and the equivalent rated resistance of each incandescent lamp until the voltage at two ends of each incandescent lamp does not exceed the preset load voltage parameter value. In the embodiment of the invention, each incandescent lamp of the three-phase alternating current phase sequence detection circuit is respectively connected with a resistive load with the same resistance value in series, and the resistance value of the resistive load is set so that the corresponding three-phase load voltage and the voltage at the two ends of each incandescent lamp do not exceed the preset load voltage parameter value, if the three-phase load voltage or the voltage at the two ends of any incandescent lamp exceed the preset load voltage parameter value, the resistive load is reset until the voltage across each incandescent lamp does not exceed the preset load voltage parameter value, therefore, the determined resistance value of the resistive load of the three-phase alternating current phase sequence detection circuit can effectively ensure that the working voltage of the equipment meets the long-term working requirement, under the condition of meeting the requirement that the brightness difference of the incandescent lamp is large enough, the requirement that human eyes can normally distinguish is realized, the long-term work of equipment working more safely and stably is ensured, and the product adaptability is strong.
Each step is analyzed in detail below.
In step 101, a mains phase voltage, a reactance ratio parameter value and an incandescent lamp power of a three-phase alternating current phase sequence detection circuit are obtained, wherein each incandescent lamp of the three-phase alternating current phase sequence detection circuit is respectively connected with a resistive load with the same resistance value in series.
Fig. 3 is a schematic wiring diagram of a three-phase ac phase sequence detection circuit according to an embodiment of the present invention. As shown in fig. 3, 1 capacitor and 2 incandescent lamps are used as temporary loads, and are connected to the existing power grid by using a star connection method, where each incandescent lamp is connected in series with a resistive load having the same resistance value, it should be noted that the series resistive load is not limited to a resistor, and any resistive load having an equivalent resistance value may be selected as needed, such as a resistor, an incandescent lamp, a resistance wire, and the like. The phase voltage of a power supply of the three-phase alternating current phase sequence detection circuit is U AN1 2 incandescent lamps P of the same power can be selected.
In steps 102 to 103, the equivalent rated resistance of the incandescent lamp is calculated according to the power supply item voltage and the incandescent lamp power. And calculating the three-phase load voltage according to the reactance ratio parameter value and the power supply phase voltage.
In one embodiment, the three-phase load voltage includes: phase a load voltage, phase B load voltage, and phase C load voltage.
In this embodiment, calculating the three-phase load voltage based on the reactance ratio parameter value and the mains phase voltage includes:
and calculating the A-phase load voltage according to the reactance ratio parameter value and the power supply phase voltage according to the following formula:
wherein, U AN1 For mains phase voltage, U AN2 Is A phase load voltage, k is reactance ratio parameter value;
and calculating the B-phase load voltage according to the reactance ratio parameter value and the power supply phase voltage according to the following formula:
wherein, U AN1 For mains phase voltage, U BN2 Is the load voltage of phase B, k is the reactance ratio parameter value;
and calculating the C-phase load voltage according to the reactance ratio parameter value and the power supply phase voltage according to the following formula:
wherein, U AN1 For mains phase voltage, U CN2 And k is a reactance ratio parameter value.
In specific implementation, a vector relationship of a power supply system is established, including a vector direction and an amplitude. Wherein, taking A phase voltage vector as a reference, B phase voltage vector of the power supply system is as follows:
wherein, U' BN1 Is a B-phase voltage vector, U' AN1 Is the A-phase voltage vector, and j is the imaginary part of the complex frequency domain.
The vector of the C phase voltage of the power supply system is as follows:
wherein, U' CN1 Is a B-phase voltage vector, U' AN1 Is an a-phase voltage vector.
The voltage vector between load neutral N2 and source neutral N1 is:
further, the load voltage vector is calculated as follows:
the vector of the voltage born by the two ends of the A-phase load is as follows:
the vector of the voltage born by the two ends of the B-phase load is as follows:
the vector of the voltage born by the two ends of the C-phase load is as follows:
then, with the A-phase power supply voltage as a reference, respectively deducing an equivalent three-phase load voltage vector and an equivalent three-phase load voltage amplitude: the vector amplitude of the A-phase power supply voltage is taken as a reference, and the amplitude of the voltage born by two ends of the A-phase load is as follows:
that is to say that the first and second electrodes,
the voltage vector of the A-phase voltage source is taken as a reference, and the voltage vector born by two ends of the B-phase load is as follows:
the vector amplitude of the voltage of the A-phase power supply is taken as a reference, and the amplitude of the voltage born by two ends of the B-phase load is as follows:
that is to say that the first and second electrodes,
the amplitude of the voltage vector of the A-phase power supply is taken as a reference, and the voltage vectors born by two ends of the C-phase load are as follows:
the vector amplitude of the A-phase power supply voltage is taken as a reference, and the amplitude of the voltage born by two ends of the C-phase load is as follows:
that is to say that the first and second electrodes,
in step 104, a resistance value of the resistive load is set, voltages at two ends of each incandescent lamp are calculated according to the resistance value of the resistive load, the equivalent rated resistance of each incandescent lamp and the three-phase load voltage, the three-phase load voltage and the voltages at two ends of each incandescent lamp are respectively compared with a preset load voltage parameter value, if the three-phase load voltage or the voltages at two ends of any one of the incandescent lamps exceeds the preset load voltage parameter value, the resistance value of the resistive load is reset, and the voltages at two ends of each incandescent lamp are calculated according to the reset resistance value of the resistive load and the equivalent rated resistance of each incandescent lamp until the voltages at two ends of each incandescent lamp do not exceed the preset load voltage parameter value.
In one embodiment, setting the resistance value of the resistive load, calculating the voltage across each incandescent lamp according to the resistance value of the resistive load, the equivalent rated resistance of the incandescent lamp and the three-phase load voltage, and comparing the three-phase load voltage and the voltage across each incandescent lamp with a preset load voltage parameter value respectively includes:
calculating the voltage at two ends of the B-phase incandescent lamp according to the resistance value of the resistive load, the equivalent rated resistance of the incandescent lamp and the B-phase load voltage;
calculating the voltage at two ends of the C-phase incandescent lamp according to the resistance value of the resistive load, the equivalent rated resistance of the incandescent lamp and the C-phase load voltage;
respectively comparing the A-phase load voltage, the B-phase load voltage, the voltages at two ends of the B-phase incandescent lamp, the C-phase load voltage and the voltages at two ends of the C-phase incandescent lamp with preset load voltage parameter values;
if the three-phase load voltage or the voltage at the two ends of any incandescent lamp exceeds the preset load voltage parameter value, resetting the resistance value of the resistive load and calculating the voltage at the two ends of each incandescent lamp according to the reset resistance value of the resistive load and the equivalent rated resistance of the incandescent lamp until the voltage at the two ends of each incandescent lamp does not exceed the preset load voltage parameter value, and the method comprises the following steps:
if at least one of the A-phase load voltage, the B-phase load voltage, the voltage at two ends of the B-phase incandescent lamp, the C-phase load voltage and the voltage at two ends of the C-phase incandescent lamp exceeds a preset load voltage parameter value, resetting the resistance value of the resistive load and calculating the voltage at two ends of the B-phase incandescent lamp according to the reset resistance value of the resistive load, the equivalent rated resistance of the incandescent lamp and the B-phase load voltage; and calculating the voltage at two ends of the C-phase incandescent lamp according to the reset resistance value of the resistive load, the equivalent rated resistance of the incandescent lamp and the voltage of the C-phase load until the voltage at two ends of the B-phase incandescent lamp and the voltage at two ends of the C-phase incandescent lamp do not exceed the preset load voltage parameter value.
In this embodiment, the voltage across the B-phase incandescent lamp is calculated according to the resistance of the resistive load, the equivalent rated resistance of the incandescent lamp, and the B-phase load voltage according to the following formula:
wherein R is 1 For incandescent lamps with an equivalent rated resistance, R 2 Is the resistance value of a resistive load, U BN3 Voltage across a B-phase incandescent lamp, U BN2 Is a B-phase load voltage；
And calculating the voltage at two ends of the C-phase incandescent lamp according to the resistance value of the resistive load, the equivalent rated resistance of the incandescent lamp and the C-phase load voltage according to the following formula:
wherein R is 1 For incandescent lamps with an equivalent rated resistance, R 2 Is the resistance value of a resistive load, U CN3 The voltage across the C-phase incandescent lamp, U CN2 Is the C-phase load voltage.
In this embodiment, the method for selecting a resistive load of a three-phase alternating current phase sequence detection circuit further includes:
calculating the ratio of the load voltage of the phase B to the load voltage of the phase C;
and checking the selected reactance ratio parameter value according to the comparison result of the calculated ratio and a preset threshold value.
In specific implementation, z is calculated by comparing the load voltage amplitude of the phase B with the load voltage amplitude of the phase C, and the result is as follows:
fig. 4 is a graph of reactance ratio parameter k according to the present invention as a function of the ratio z of the load voltage of phase B to the load voltage of phase C, where the magnitude of the load voltage of phase B is compared with the magnitude of the load voltage of phase C, and if the value is 1, it indicates that the brightness of the incandescent lamp B is the same as that of the incandescent lamp C without any difference. The larger the value, the larger the difference between the brightness of the incandescent lamp B and the brightness of the incandescent lamp C. Fig. 5 is a diagram of the relationship between three-phase load voltage and reactance ratio k according to the present invention. The load voltage amplitude ratio is 1, which represents the rated voltage of the power supply system and the rated voltage of the load. If the value is larger than 1, the current load current exceeds the rated current when the load works in an overvoltage state, so that the load cannot work for a long time, and the work needs to be stopped intermittently to prevent the load from being damaged due to long-term overvoltage. Generally all loads are capable of withstanding an overpressure for a period of time, the degree of overpressure andthe overvoltage is time dependent and the characteristics of each load are different but need to be reviewed to prevent damage to the load depending on the characteristics of the particular load. If the value is less than 1, the load is operated in an undervoltage state, and the load is normally in a safe operation state. In fig. 4 to 5, k is a reactance ratio parameter value, ω -2 pi f is a grid angular frequency, pi is a circumferential ratio, f is a grid frequency, and the unit is Hz; c is capacitance value of the capacitor, and the unit is F; r 1 The equivalent rated resistance value of the incandescent lamp is in omega; z is the voltage amplitude ratio of the B-phase load to the C-phase load; for resistive load "incandescent lamps", this is satisfied
Wherein, U is the effective value of the voltage of the power grid and the unit is V; p is the incandescent power in W.
In this embodiment, the preset load voltage parameter value is 1.6 times the long-term operating voltage value.
In one embodiment, the method for selecting the resistive load of the three-phase alternating current phase sequence detection circuit further includes:
and determining the capacitance value of the three-phase alternating current phase sequence detection circuit according to the equivalent rated resistance, the resistance value of the resistive load and the reactance ratio parameter value of the incandescent lamp according to the following formula:
where k is the reactance ratio parameter value, R 1 For incandescent lamps with an equivalent rated resistance, R 2 For the resistance value of the resistive load, ω ═ 2 π f is the grid angular frequency, and π is the circumferential rate.
In one embodiment, the method for selecting the resistive load of the three-phase alternating current phase sequence detection circuit further includes:
calculating three-phase load current according to the reactance ratio parameter value and the power supply phase voltage;
and comparing the three-phase load current with a preset load current parameter value, if the three-phase load current exceeds the preset load current parameter value, resetting the resistance value of the resistive load and calculating the three-phase load current according to the reset resistance value of the resistive load and the power phase voltage until the three-phase load current does not exceed the preset load current parameter value.
A specific embodiment is given below to illustrate a specific application of the resistive load selection of the three-phase alternating current phase sequence detection circuit in the embodiment of the present invention. As shown in fig. 6, in this embodiment, the resistive load selection of the three-phase alternating current phase sequence detection circuit is performed according to the following steps:
1. mains phase voltage U AN1 Is 220V alternating current;
2. determining a reactance ratio parameter value k to be 3;
3. selecting 2 series resistors R2 with the resistance value of 100 omega and the power of 500W; 2 incandescent lamps with the same power and 220V rated voltage are selected, the power is P, and 100W is assumed;
4. calculating the equivalent rated resistance R2 of the incandescent lamp to be 968 omega, and the rated current In to be 0.45A;
5. according to the formula
Calculating the capacitance value C to be 19.73 uF;
6. according to the formula
Calculating A-phase load voltage U AN2 0.83, not exceeding 1.6 times long-term working voltage;
7. according to the formula
Calculating the B-phase load voltage U BN2 Is 1.87;
8. based on the proportional relationship between the series resistance R2 and the incandescent equivalent resistance R1,
calculating the voltage at two ends of the incandescent lamp to be 1.69 which exceeds 1.6 times of the long-term working voltage;
8. reselecting a series resistor R2, wherein the resistance value is 200 omega, and the power is 500W;
9. 2 incandescent lamps with the same power and 220V rated voltage are selected, the power is P, and 100W is assumed;
10. calculating the equivalent rated resistance R1 of the incandescent lamp to be 968 omega, and the rated current In to be 0.45A;
11. according to the formula
Calculating the capacitance value C to be 19.73 uF;
12. according to the formula
Calculating A-phase load voltage U AN2 0.83, not exceeding 1.6 times long-term working voltage;
13. according to the formula
Calculating the B-phase load voltage U BN2 The content of the organic acid is 1.87,
14. based on the proportional relationship between the series resistance R2 and the incandescent equivalent resistance R1,
calculating the voltage at two ends of the incandescent lamp to be 1.55 and not to exceed 1.6 times of the long-term working voltage;
15. according to the formula
Calculating C-phase load voltage U CN2 0.45, not exceeding 1.6 times long-term working voltage;
15. checking and calculating three-phase load currents Iao, Ibo and Ico, and comparing the three-phase load currents with load current parameters to ensure that the three-phase load currents do not exceed long-term working values;
16. the voltage ratio of the final B phase to the C phase is 3.49, and the brightness ratio of the incandescent lamp can be observed by human eyes and meets the actual requirement.
Based on the same inventive concept, the embodiment of the present invention further provides a resistive load selection device for a three-phase alternating current phase sequence detection circuit, as described in the following embodiments. Because the principles for solving the problems are similar to the resistive load selection method of the three-phase alternating current phase sequence detection circuit, the implementation of the resistive load selection device of the three-phase alternating current phase sequence detection circuit can refer to the implementation of the method, and repeated parts are not described again.
Fig. 7 is a structural diagram of a resistive load selection device of a three-phase alternating current phase sequence detection circuit according to an embodiment of the present invention, and as shown in fig. 7, the resistive load selection device of the three-phase alternating current phase sequence detection circuit includes:
a voltage power parameter obtaining module 701, configured to obtain a power phase voltage, a reactance ratio parameter value, and an incandescent lamp power of a three-phase alternating current phase sequence detection circuit, where each incandescent lamp of the three-phase alternating current phase sequence detection circuit is connected in series to a resistive load with the same resistance value;
an incandescent lamp equivalent rated resistance calculation module 702, configured to calculate an incandescent lamp equivalent rated resistance according to the power item voltage and the incandescent lamp power;
a three-phase load voltage calculation module 703, configured to calculate a three-phase load voltage according to the reactance ratio parameter value and the power supply phase voltage;
and the resistive load resistance value determining module 704 is configured to set a resistance value of the resistive load, calculate voltages at two ends of each incandescent lamp according to the resistance value of the resistive load, the equivalent rated resistance of each incandescent lamp, and the three-phase load voltage, compare the three-phase load voltage and the voltages at two ends of each incandescent lamp with a preset load voltage parameter value, reset the resistance value of the resistive load if the three-phase load voltage or the voltages at two ends of any one of the incandescent lamps exceeds the preset load voltage parameter value, and calculate the voltages at two ends of each incandescent lamp according to the reset resistance value of the resistive load and the equivalent rated resistance of each incandescent lamp until the voltages at two ends of each incandescent lamp do not exceed the preset load voltage parameter value.
Based on the aforementioned inventive concept, as shown in fig. 8, an embodiment of the present invention further provides a computer apparatus 800, which includes a memory 810, a processor 820, and a computer program 830 stored in the memory 810 and executable on the processor 820, where the processor 820 implements the resistive load selection method of the three-phase alternating current phase sequence detection circuit when executing the computer program 830.
Based on the foregoing inventive concept, an embodiment of the present invention further provides a computer-readable storage medium, where a computer program is stored, and when the computer program is executed by a processor, the method for selecting a resistive load of the three-phase alternating current phase sequence detection circuit is implemented.
The embodiment of the invention also provides a computer program product, which comprises a computer program, and when the computer program is executed by a processor, the resistive load selection method of the three-phase alternating current phase sequence detection circuit is realized.
The method comprises the steps of obtaining a power supply phase voltage, a reactance ratio parameter value and incandescent lamp power of a three-phase alternating current phase sequence detection circuit, wherein each incandescent lamp of the three-phase alternating current phase sequence detection circuit is respectively connected with a resistive load with the same resistance value in series; calculating the equivalent rated resistance of the incandescent lamp according to the power item voltage and the incandescent lamp power; calculating three-phase load voltage according to the reactance ratio parameter value and the power supply phase voltage; setting the resistance value of the resistive load, calculating the voltage at two ends of each incandescent lamp according to the resistance value of the resistive load, the equivalent rated resistance of each incandescent lamp and the three-phase load voltage, respectively comparing the three-phase load voltage and the voltage at two ends of each incandescent lamp with a preset load voltage parameter value, resetting the resistance value of the resistive load if the three-phase load voltage or the voltage at two ends of any incandescent lamp exceeds the preset load voltage parameter value, and calculating the voltage at two ends of each incandescent lamp according to the reset resistance value of the resistive load and the equivalent rated resistance of each incandescent lamp until the voltage at two ends of each incandescent lamp does not exceed the preset load voltage parameter value. In the embodiment of the invention, each incandescent lamp of the three-phase alternating current phase sequence detection circuit is respectively connected in series with a resistive load with the same resistance value, and the resistance value of the resistive load is set so that the corresponding three-phase load voltage and the voltage at the two ends of each incandescent lamp do not exceed the preset load voltage parameter value, if the three-phase load voltage or the voltage at the two ends of any incandescent lamp exceed the preset load voltage parameter value, the resistive load is reset until the voltage across each incandescent lamp does not exceed the preset load voltage parameter value, therefore, the determined resistance value of the resistive load of the three-phase alternating current phase sequence detection circuit can effectively ensure that the working voltage of the equipment meets the long-term working requirement, under the condition of meeting the requirement that the brightness difference of the incandescent lamp is large enough, the requirement that human eyes can normally distinguish is realized, the long-term work of equipment working more safely and stably is ensured, and the product adaptability is strong.
As will be appreciated by one skilled in the art, embodiments of the present invention may be provided as a method, system, or computer program product. Accordingly, the present invention may take the form of an entirely hardware embodiment, an entirely software embodiment or an embodiment combining software and hardware aspects. Furthermore, the present invention may take the form of a computer program product embodied on one or more computer-usable storage media (including, but not limited to, disk storage, CD-ROM, optical storage, and the like) having computer-usable program code embodied therein.
The present invention has been described with reference to flowchart illustrations and/or block diagrams of methods, apparatus (systems), and computer program products according to embodiments of the invention. It will be understood that each flow and/or block of the flow diagrams and/or block diagrams, and combinations of flows and/or blocks in the flow diagrams and/or block diagrams, can be implemented by computer program instructions. These computer program instructions may be provided to a processor of a general purpose computer, special purpose computer, embedded processor, or other programmable data processing apparatus to produce a machine, such that the instructions, which execute via the processor of the computer or other programmable data processing apparatus, create means for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.
These computer program instructions may also be stored in a computer-readable memory that can direct a computer or other programmable data processing apparatus to function in a particular manner, such that the instructions stored in the computer-readable memory produce an article of manufacture including instruction means which implement the function specified in the flowchart flow or flows and/or block diagram block or blocks.
These computer program instructions may also be loaded onto a computer or other programmable data processing apparatus to cause a series of operational steps to be performed on the computer or other programmable apparatus to produce a computer implemented process such that the instructions which execute on the computer or other programmable apparatus provide steps for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.
The above-mentioned embodiments are intended to illustrate the objects, technical solutions and advantages of the present invention in further detail, and it should be understood that the above-mentioned embodiments are only exemplary embodiments of the present invention, and are not intended to limit the scope of the present invention, and any modifications, equivalent substitutions, improvements and the like made within the spirit and principle of the present invention should be included in the scope of the present invention.
Claims (12)
1. A resistive load selection method of a three-phase alternating current phase sequence detection circuit is characterized by comprising the following steps:
obtaining a power supply phase voltage, a reactance ratio parameter value and incandescent lamp power of a three-phase alternating current phase sequence detection circuit, wherein each incandescent lamp of the three-phase alternating current phase sequence detection circuit is respectively connected with a resistive load with the same resistance value in series;
calculating the equivalent rated resistance of the incandescent lamp according to the power supply item voltage and the incandescent lamp power;
calculating three-phase load voltage according to the reactance ratio parameter value and the power supply phase voltage;
setting the resistance value of the resistive load, calculating the voltage at two ends of each incandescent lamp according to the resistance value of the resistive load, the equivalent rated resistance of each incandescent lamp and the three-phase load voltage, respectively comparing the three-phase load voltage and the voltage at two ends of each incandescent lamp with a preset load voltage parameter value, resetting the resistance value of the resistive load if the three-phase load voltage or the voltage at two ends of any incandescent lamp exceeds the preset load voltage parameter value, and calculating the voltage at two ends of each incandescent lamp according to the reset resistance value of the resistive load and the equivalent rated resistance of each incandescent lamp until the voltage at two ends of each incandescent lamp does not exceed the preset load voltage parameter value.
2. A resistive load selection method for a three-phase alternating current phase sequence detection circuit according to claim 1, wherein the three-phase load voltage comprises: phase a load voltage, phase B load voltage and phase C load voltage;
setting the resistance value of the resistive load, calculating the voltage at two ends of each incandescent lamp according to the resistance value of the resistive load, the equivalent rated resistance of each incandescent lamp and the three-phase load voltage, and respectively comparing the three-phase load voltage and the voltage at two ends of each incandescent lamp with the preset load voltage parameter value, wherein the method comprises the following steps:
calculating the voltage at two ends of the B-phase incandescent lamp according to the resistance value of the resistive load, the equivalent rated resistance of the incandescent lamp and the B-phase load voltage;
calculating the voltage at two ends of the C-phase incandescent lamp according to the resistance value of the resistive load, the equivalent rated resistance of the incandescent lamp and the C-phase load voltage;
respectively comparing the A-phase load voltage, the B-phase load voltage, the voltage at two ends of a B-phase incandescent lamp, the C-phase load voltage and the voltage at two ends of a C-phase incandescent lamp with preset load voltage parameter values;
if the three-phase load voltage or the voltage at the two ends of any incandescent lamp exceeds the preset load voltage parameter value, resetting the resistance value of the resistive load and calculating the voltage at the two ends of each incandescent lamp according to the reset resistance value of the resistive load and the equivalent rated resistance of the incandescent lamp until the voltage at the two ends of each incandescent lamp does not exceed the preset load voltage parameter value, and the method comprises the following steps:
if at least one of the A-phase load voltage, the B-phase load voltage, the voltage at two ends of the B-phase incandescent lamp, the C-phase load voltage and the voltage at two ends of the C-phase incandescent lamp exceeds a preset load voltage parameter value, resetting the resistance value of the resistive load and calculating the voltage at two ends of the B-phase incandescent lamp according to the reset resistance value of the resistive load, the equivalent rated resistance of the incandescent lamp and the B-phase load voltage; and calculating the voltage at two ends of the C-phase incandescent lamp according to the reset resistance value of the resistive load, the equivalent rated resistance of the incandescent lamp and the voltage of the C-phase load until the voltage at two ends of the B-phase incandescent lamp and the voltage at two ends of the C-phase incandescent lamp do not exceed the preset load voltage parameter value.
3. A resistive load selection method for a three-phase alternating current phase sequence detection circuit according to claim 2, wherein the voltage across the B-phase incandescent lamp is calculated according to the resistance of the resistive load, the equivalent rated resistance of the incandescent lamp, and the B-phase load voltage according to the following formula:
wherein R is 1 For incandescent lamps with an equivalent rated resistance, R 2 Is the resistance value of a resistive load, U BN3 Voltage across a B-phase incandescent lamp, U BN2 Is the phase B load voltage;
and calculating the voltage at two ends of the C-phase incandescent lamp according to the resistance value of the resistive load, the equivalent rated resistance of the incandescent lamp and the C-phase load voltage according to the following formula:
wherein R is 1 Is the equivalent rated resistance, R, of incandescent lamp 2 Is the resistance of a resistive load, U CN3 The voltage across the C-phase incandescent lamp, U CN2 Is the C-phase load voltage.
4. A method of selecting a resistive load for a three-phase ac phase sequence detection circuit according to claim 2, wherein calculating the three-phase load voltage based on the reactance ratio parameter value and the mains phase voltage comprises:
and calculating the A-phase load voltage according to the reactance ratio parameter value and the power supply phase voltage according to the following formula:
wherein, U AN1 For mains phase voltage, U AN2 Is A phase load voltage, k is reactance ratio parameter value;
and calculating the B-phase load voltage according to the reactance ratio parameter value and the power supply phase voltage according to the following formula:
wherein, U AN1 For mains phase voltage, U BN2 Is the load voltage of phase B, k is the reactance ratio parameter value;
and calculating the C-phase load voltage according to the reactance ratio parameter value and the power supply phase voltage according to the following formula:
wherein, U AN1 For mains phase voltage, U CN2 And k is a reactance ratio parameter value.
5. The method for selecting a resistive load of a three-phase alternating current phase sequence detection circuit according to claim 2, further comprising:
calculating the ratio of the load voltage of the phase B to the load voltage of the phase C;
and checking the selected reactance ratio parameter value according to the comparison result of the calculated ratio and a preset threshold value.
6. A resistive load selection method for a three-phase alternating current phase sequence detection circuit according to any one of claims 1 to 5, wherein the preset load voltage parameter value is a 1.6 times long-term operating voltage value.
7. The method for selecting a resistive load of a three-phase alternating current phase sequence detection circuit according to claim 1, further comprising:
and determining the capacitance value of the three-phase alternating current phase sequence detection circuit according to the equivalent rated resistance, the resistance value of the resistive load and the reactance ratio parameter value of the incandescent lamp according to the following formula:
wherein k is a reactance ratio parameter value, R 1 For incandescent lamps with an equivalent rated resistance, R 2 For the resistance value of the resistive load, ω ═ 2 π f is the grid angular frequency, and π is the circumferential rate.
8. A resistive load selection method for a three-phase alternating current phase sequence detection circuit according to claim 1, further comprising:
calculating three-phase load current according to the reactance ratio parameter value and the power supply phase voltage;
and comparing the three-phase load current with a preset load current parameter value, if the three-phase load current exceeds the preset load current parameter value, resetting the resistance value of the resistive load and calculating the three-phase load current according to the reset resistance value of the resistive load and the power phase voltage until the three-phase load current does not exceed the preset load current parameter value.
9. The utility model provides a device is selected to resistive load of three-phase alternating current phase sequence detection circuit which characterized in that includes:
the voltage power parameter obtaining module is used for obtaining a power supply phase voltage, a reactance ratio parameter value and incandescent lamp power of the three-phase alternating current phase sequence detection circuit, wherein each incandescent lamp of the three-phase alternating current phase sequence detection circuit is respectively connected with a resistive load with the same resistance value in series;
the incandescent lamp equivalent rated resistance calculation module is used for calculating the incandescent lamp equivalent rated resistance according to the power supply item voltage and the incandescent lamp power;
the three-phase load voltage calculation module is used for calculating three-phase load voltage according to the reactance ratio parameter value and the power supply phase voltage;
and the resistive load resistance value determining module is used for setting the resistance value of the resistive load, calculating the voltage at two ends of each incandescent lamp according to the resistance value of the resistive load, the equivalent rated resistance of each incandescent lamp and the three-phase load voltage, respectively comparing the three-phase load voltage and the voltage at two ends of each incandescent lamp with a preset load voltage parameter value, resetting the resistance value of the resistive load if the three-phase load voltage or the voltage at two ends of any incandescent lamp exceeds the preset load voltage parameter value, and calculating the voltage at two ends of each incandescent lamp according to the reset resistance value of the resistive load and the equivalent rated resistance of each incandescent lamp until the voltage at two ends of each incandescent lamp does not exceed the preset load voltage parameter value.
10. A computer device comprising a memory, a processor and a computer program stored on the memory and executable on the processor, wherein the processor implements the method of any one of claims 1 to 8 when executing the computer program.
11. A computer-readable storage medium, characterized in that the computer-readable storage medium stores a computer program which, when executed by a processor, implements the method of any one of claims 1 to 8.
12. A computer program product, characterized in that the computer program product comprises a computer program which, when being executed by a processor, carries out the method of any one of claims 1 to 8.
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