CN116298559A - Input open-phase detection method, device and medium - Google Patents
Input open-phase detection method, device and medium Download PDFInfo
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Abstract
The application discloses an input open-phase detection method, a device and a medium, which relate to the field of electric fault detection and prevent the open-phase protection from being made because the system is completely powered off but the cycle time required by open-phase detection is not calculated, wherein the input voltage of a three-phase line is a first minimum voltage value output when a preset minimum input voltage and the input voltage of the three-phase line is a second minimum voltage value output when the input voltage of the three-phase line is a preset maximum input voltage; determining a judgment critical value; judging whether the phase is out or not according to the judgment critical value and the real-time output voltage. The method only needs to compare the real-time voltage value with the judgment critical value to judge whether the phase is lost, and can detect the phase loss in the whole range of the three-phase input voltage, so that the phenomenon that the system is unstable or damaged due to the fact that the voltage oscillation of the film capacitor bus is caused by the fact that the film capacitor system is not protected in time under the phase loss state is prevented, and the method can detect the phase loss of the voltage of different power grids on site, and is high in applicability.
Description
Technical Field
The present disclosure relates to the field of electrical fault detection, and in particular, to a method, an apparatus, and a medium for detecting an input open-phase in a full voltage range for a thin film capacitor control system.
Background
The three-phase three-wire alternating current input working mode is widely applied to the fields of power supply, industrial control and the like, and the phase loss or unbalance can lead to adverse effects of power output reduction, power factor reduction, harmonic wave increase and the like of circuit operation, even lead to serious consequences of circuit non-operation, fault, accident and the like; therefore, a reliable and perfect detection circuit is very important for a three-phase three-wire system. In a three-phase power input system, input open-phase detection is a common protection function. In general, whether an input open phase occurs is judged by detecting the magnitude of the dc voltage ripple or the duration of the dc voltage ripple.
Sampling the DC bus voltage of the three-phase input device, taking the maximum value point or the minimum value point of the sampled DC bus voltage as a time starting point, starting to judge whether the DC bus voltage meets monotonicity in the T1 time period, and taking the end point of the T1 time period as a timing starting point if the DC bus voltage meets monotonicity; taking the next maximum value point or minimum value point of the direct current bus voltage as a time starting point, starting to judge whether the direct current bus voltage meets monotonicity in a T1 time period, and taking the end point of the T1 time period as a timing ending point and a next timing starting point if the direct current bus voltage meets monotonicity; and obtaining alternating current component period values of the direct current bus voltage according to the timing value between the timing starting point and the timing ending point, and judging that the three-phase input equipment is an input open-phase if the alternating current component period values of the continuous N direct current bus voltages meet the preset open-phase judgment value.
For the method, certain defects exist by judging the ripple of the bus voltage or the monotonicity of the bus voltage within a certain periodicity. When the system decelerates faster, the bus voltage can be rapidly pumped up, and the monotonicity characteristic in the periodicity of the bus voltage cannot be judged under the phase failure state of the system, so that the scheme has smaller applicability.
However, for the thin film capacitor system, because the capacitor is powered down faster when the thin film capacitor is powered down, there may be a period time that is already completely powered down but is not calculated and needed by the phase failure detection, so that no phase failure protection is made.
Therefore, the input open-phase detection method for the thin film capacitor control system is provided, and the technical problem to be solved in the field is to prevent the system from being completely powered off but the open-phase detection needs a period time which is not calculated and is not protected.
Disclosure of Invention
The purpose of the application is to provide an input open-phase detection method for a full voltage range of a thin film capacitor control system, which prevents the system from being completely powered down, but the cycle time required by open-phase detection is not calculated and thus open-phase protection is not made.
In order to solve the above technical problems, the present application provides an input open-phase detection method, which is applied to an input open-phase detection circuit, including: the device comprises a first rectifying diode, a second rectifying diode, a third rectifying diode, a first voltage dividing resistor, a second voltage dividing resistor, a clamping circuit and a controller, wherein the first rectifying diode, the second rectifying diode and the third rectifying diode are respectively connected with a first phase line, a second phase line and a third phase line, the other ends of the first rectifying diode, the second rectifying diode and the third rectifying diode are respectively connected with a first end of the voltage dividing resistor, a second end of the voltage dividing resistor is connected with the clamping circuit, a first end of the second voltage dividing resistor and a detection signal output end, the detection signal output end is connected with the controller, and the second voltage dividing resistor is grounded;
the method comprises the following steps:
when the input voltage of the three-phase line is the preset minimum input voltage, a first minimum voltage value output by the signal output end is detected;
acquiring a second minimum voltage value output by the detection signal output end when the phase-missing input of the three-phase line is acquired and the input voltage is a preset highest input voltage;
judging whether the difference value between the first minimum voltage value and the second minimum voltage value is larger than a preset difference value or not;
if the voltage is larger than the first threshold value, acquiring a middle value of the first minimum voltage value and the second minimum voltage value as a judgment threshold value;
judging whether the phase is out or not according to the judgment critical value and the real-time output voltage.
Preferably, in the input open-phase detection method, the minimum input voltage is preset to be 220V, and the maximum input voltage is preset to be 520V.
Preferably, in the input open-phase detection method, if the difference between the first minimum voltage value and the second minimum voltage value is smaller than a preset difference, the method further includes:
and adjusting the first voltage dividing resistor until the difference value between the first minimum voltage value and the second minimum voltage value is larger than a preset difference value.
Preferably, in the input open-phase detection method, the preset difference is 0.2V.
Preferably, in the above input open-phase detection method, determining whether the open-phase exists according to the determination threshold and the real-time output voltage includes:
if the real-time output voltage is smaller than the judgment critical value, the phase-failure state is obtained;
if the real-time output voltage is not less than the judgment critical value, the state is normal.
Preferably, in the input open-phase detection method, the input open-phase detection circuit further includes: a filter circuit; the input end of the filter circuit is connected with the output end of the detection signal, and the output end of the filter circuit is connected with the controller; the controller is a micro control unit; correspondingly, when the input voltage of the three-phase line is the preset minimum input voltage, the first minimum voltage value output by the detection signal output end is obtained, and the method comprises the following steps:
and reading the voltage signal of the AD sampling port of the micro control unit through the upper computer, and taking the minimum voltage signal in a preset period as a first minimum voltage value.
Preferably, in the input open-phase detection method, the input open-phase detection circuit further includes: a filter circuit and an oscilloscope; the input end of the filter circuit is connected with the detection signal output end, the output end of the filter circuit is connected with the oscilloscope, and the oscilloscope is connected with the controller; correspondingly, when the input voltage of the three-phase line is the preset minimum input voltage, the first minimum voltage value output by the detection signal output end is obtained, and the method comprises the following steps:
and acquiring a voltage signal read by the oscilloscope, and taking the minimum voltage signal in a preset period as a first minimum voltage value.
For solving above-mentioned technical problem, this application still provides an input open-phase detection device, is applied to input open-phase detection circuit, includes: the device comprises a first rectifying diode, a second rectifying diode, a third rectifying diode, a first voltage dividing resistor, a second voltage dividing resistor, a clamping circuit and a controller, wherein the first rectifying diode, the second rectifying diode and the third rectifying diode are respectively connected with a first phase line, a second phase line and a third phase line, the other ends of the first rectifying diode, the second rectifying diode and the third rectifying diode are respectively connected with a first end of the voltage dividing resistor, a second end of the voltage dividing resistor is connected with the clamping circuit, a first end of the second voltage dividing resistor and a detection signal output end, the detection signal output end is connected with the controller, and the second voltage dividing resistor is grounded;
the device comprises:
the first acquisition module is used for acquiring a first minimum voltage value output by the detection signal output end when the input voltage of the three-phase line is a preset minimum input voltage;
the second acquisition module is used for acquiring a second minimum voltage value output by the detection signal output end when the phase line of the three-phase line is in open-phase input and the input voltage is a preset highest input voltage;
the judging module is used for judging whether the difference value between the first minimum voltage value and the second minimum voltage value is larger than a preset difference value or not; if the set value is larger than the set value, triggering the setting module;
the setting module is used for acquiring an intermediate value between the first minimum voltage value and the second minimum voltage value as a judgment critical value;
and the detection module is used for judging whether the phase is out of phase according to the judgment critical value and the real-time output voltage.
For solving above-mentioned technical problem, this application still provides an input open-phase detection device, includes:
a memory for storing a computer program;
and the processor is used for realizing the steps of the input open-phase detection method when executing the computer program.
In order to solve the above technical problem, the present application further provides a computer readable storage medium, on which a computer program is stored, which when executed by a processor implements the steps of the input phase failure detection method described above.
According to the input open-phase detection method, when the input voltage of the three-phase line is the preset minimum input voltage, a first minimum voltage value output by the output end of the detection signal is obtained; acquiring a second minimum voltage value output by the detection signal output end when the phase-missing input of the three-phase line is acquired and the input voltage is a preset highest input voltage; judging whether the difference value between the first minimum voltage value and the second minimum voltage value is larger than a preset difference value or not; if the voltage is larger than the first threshold value, acquiring a middle value of the first minimum voltage value and the second minimum voltage value as a judgment threshold value; judging whether the phase is out or not according to the judgment critical value and the real-time output voltage. The method only needs to compare the real-time voltage value with the judgment critical value to judge whether the phase is lost, the phase loss detection can be carried out in the whole range of the three-phase input voltage, and the phase loss detection can be carried out on different power grid voltages on site, so that the applicability is strong. The method solves the problem that the PWM can be rapidly judged and immediately turned off without periodic detection under the condition of power failure of the film capacitor system, and avoids breakdown of a power module caused by overhigh voltage due to superposition of line voltage output on bus voltage under the condition of power failure. The system is prevented from being unstable or damaged due to the fact that the voltage oscillation of the bus of the film capacitor is caused by the fact that the film capacitor system is not protected in time in the phase-failure state, and the misjudgment of the phase failure caused by the fact that the voltage frequency or the voltage amplitude of the bus is calculated incorrectly under the condition of power grid distortion is avoided.
In addition, the application also provides a device and a medium, which correspond to the method and have the same effects.
Drawings
For a clearer description of the embodiments of the present application, the drawings that are needed in the embodiments will be briefly described, it being apparent that the drawings in the following description are only some embodiments of the present application, and that other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.
Fig. 1 is a schematic diagram of an input open-phase detection circuit according to an embodiment of the present application;
fig. 2 is a flowchart of an input open-phase detection method provided in an embodiment of the present application;
fig. 3 is a structural diagram of an input open-phase detection device according to an embodiment of the present application;
fig. 4 is a block diagram of another input open-phase detection device according to an embodiment of the present application.
Detailed Description
The following description of the technical solutions in the embodiments of the present application will be made clearly and completely with reference to the drawings in the embodiments of the present application, and it is apparent that the described embodiments are only some embodiments of the present application, but not all embodiments. All other embodiments obtained by those skilled in the art based on the embodiments herein without making any inventive effort are intended to fall within the scope of the present application.
The core of the application is to provide an input open-phase detection method, an input open-phase detection device and a medium.
In order to provide a better understanding of the present application, those skilled in the art will now make further details of the present application with reference to the drawings and detailed description.
In a three-phase power input system, input open-phase detection is a common protection function. Conventionally, whether an input phase failure occurs is generally determined by detecting the magnitude of the dc ripple or the duration of the dc ripple.
Sampling the DC bus voltage of the three-phase input device, taking the maximum value point or the minimum value point of the sampled DC bus voltage as a time starting point, starting to judge whether the DC bus voltage meets monotonicity in the T1 time period, and taking the end point of the T1 time period as a timing starting point if the DC bus voltage meets monotonicity; taking the next maximum value point or minimum value point of the direct current bus voltage as a time starting point, starting to judge whether the direct current bus voltage meets monotonicity in a T1 time period, and taking the end point of the T1 time period as a timing ending point and a next timing starting point if the direct current bus voltage meets monotonicity; and obtaining alternating current component period values of the direct current bus voltage according to the timing value between the timing starting point and the timing ending point, and judging that the three-phase input equipment is an input open-phase if the alternating current component period values of the continuous N direct current bus voltages meet the preset open-phase judgment value.
The method comprises the steps of injecting detection currents of preset current amplitude and current angle into a three-phase motor, acquiring actual current amplitude and actual current angle of the three-phase motor according to current values of stator windings of the three-phase motor to judge whether the three-phase motor is in phase failure or not, and indicating that the three-phase motor is not in phase failure when the actual current amplitude of the three-phase motor reaches the preset current amplitude within preset time and the actual current angle reaches the preset current angle;
calculating the energy storage change (delta Wc) of the bus capacitor by monitoring the bus voltage of the frequency converter in real time in each preset period (T), judging whether the frequency converter fails or not directly according to the output energy (Wout) of the frequency converter and the energy (delta Wc) reduced by the bus capacitor, and recording the times of the frequency converter failure; if the frequency of the frequency converter faults is greater than the preset frequency, judging that the input of the frequency converter is powered off.
For the method, certain defects exist by judging the ripple of the bus voltage or the monotonicity of the bus voltage within a certain periodicity. When the system decelerates faster, the bus voltage can be rapidly pumped up, and the monotonicity characteristic in the periodicity of the bus voltage cannot be judged under the phase failure state of the system, so that the scheme has smaller applicability.
Even if the system does not perform rapid deceleration, the above detection method has a further disadvantage: a certain periodicity requirement is required for judging the input phase failure. For the electrolytic capacitor system, no matter under the condition of phase failure or power failure, periodic phase failure detection can be normally used to a large extent, and the electrolytic capacitor has a larger capacitance value, has certain stability to the voltage pump rising of the line voltage superimposed on the bus after sudden power failure, and can protect the module from damage through the shutdown Pulse Width Modulation (PWM) of the bus falling below an undervoltage value at the moment, so that the module can be correctly judged in most cases. However, for the thin film capacitor system, the periodic detection is not applicable any more, because the capacitor is powered down quickly when the thin film capacitor is powered down, and there may be a period time that is already completely powered down but the phase failure detection needs is not calculated to be completed, so that the phase failure protection is not made.
In addition, for those types of bus lines with direct current reactance, the method of judging whether the phase is lost by calculating the period or the frequency causes miscalculation of the frequency when the power grid is distorted, and the judgment fails.
The detection object of the detection method is bus voltage, and the detection is performed on the front end of a three-phase input power supply. If the output of the three-phase input full-wave rectifying circuit is zero, the optocoupler is cut off, and when the output current of the three-phase input full-wave rectifying circuit is non-zero, the optocoupler is conducted, and judgment is carried out according to the low level output when the optocoupler is conducted and the high level output when the optocoupler is cut off. Because the open-phase detection circuit adopts a full-wave rectification mode, when three-phase input is normal, the whole positive and negative half-cycle current will generate loss on the three-phase current-limiting resistor, the heating is serious, the reliability is low, and the service life of the circuit is short.
In order to solve the above technical problems, the present application provides an input open-phase detection method, which is applied to an input open-phase detection circuit, as shown in fig. 1, and includes: the first rectifying diode D1, the second rectifying diode D2, the third rectifying diode D3, the first voltage dividing resistor R1, the second voltage dividing resistor R2, the clamping circuit and the controller, wherein the first rectifying diode D1, the second rectifying diode D2 and the third rectifying diode D3 are respectively connected with the first phase line L1, the second phase line L2 and the third phase line L3, the other ends of the first rectifying diode D1, the second rectifying diode D2 and the third rectifying diode D3 are respectively connected with the first end of the voltage dividing resistor R1, the first end of the first voltage dividing resistor R1 clamping circuit, the first end of the second voltage dividing resistor R2 and the detection signal output end U1 are connected with the controller, and the second end of the second voltage dividing resistor R2 is grounded;
as shown in fig. 2, the method includes:
s11: when the input voltage of the three-phase line is the preset minimum input voltage, a first minimum voltage value output by the signal output end is detected;
s12: acquiring a second minimum voltage value output by the detection signal output end when the phase-missing input of the three-phase line is acquired and the input voltage is a preset highest input voltage;
s13: judging whether the difference value between the first minimum voltage value and the second minimum voltage value is larger than a preset difference value or not;
if so, go to step S14: acquiring an intermediate value between the first minimum voltage value and the second minimum voltage value as a judgment critical value;
s15: judging whether the phase is out or not according to the judgment critical value and the real-time output voltage.
In the input open-phase detection circuit provided in this embodiment, three-phase input is respectively connected to the first rectifying diode D1, the second rectifying diode D2, and the third rectifying diode D3 of the first phase line L1, the second phase line L2, and the third phase line L3. L1, L2, and L3 are commonly connected to the voltage dividing resistor R1 via rectifier diodes. The output end U1 of the detection signal after the voltage division is connected to a clamping circuit, and the clamping circuit clamps the maximum amplitude of the U1 within a preset voltage range. Preferably, the present embodiment provides a preferred solution, the clamping circuit includes: the clamping circuit clamps the voltage of the output signal within a preset range by the first diode D4 and the second diode D5.
Step S11: when the input voltage of the three-phase line is the preset minimum input voltage, a first minimum voltage value output by the signal output end is detected; the first minimum voltage value of the output of the detection signal output end U1 is obtained when the input voltage of the three-phase line is the preset minimum input voltage after the input open-phase detection circuit is powered on. Preferably, the minimum output voltage is taken as the first minimum voltage value during one power input period. The specific value of the preset minimum input voltage is not limited in this embodiment, and is set to 220V in general.
Step S12, when the phase-missing input of the three-phase line is obtained and the input voltage is the preset highest input voltage, a second minimum voltage value output by the signal output end is detected; in this embodiment, when the input voltage is the preset highest input voltage under the condition that the open-phase input is any phase power-off, the second minimum voltage value of the output of the signal output terminal U1 is detected. Preferably, the minimum output voltage is taken as the second minimum voltage value during one power input period. The specific value of the preset maximum input voltage is not limited in this embodiment, and is set to 520V in general.
The embodiment does not limit the sequence of the steps S11 and S12, and the steps are set according to actual needs.
And calculating a difference value between the first minimum voltage value when the three-phase input is normal and the second minimum voltage value when the three-phase input is in the open-phase input. Judging whether the difference value is larger than or equal to a preset difference value. In order to better distinguish the open phase from the normal state, the preset difference value needs to be greater than the corresponding AD value of 0.2V (the value of converting the analog signal into the digital signal).
If the difference is greater than the preset difference, the intermediate value between the first minimum voltage value and the second minimum voltage value is obtained as a judgment critical value, and only one test is needed for any new three-phase power supply system, after the judgment critical value is determined, the steps S11 to S14 are not needed to be repeated for the control system in the subsequent use, and the real-time voltage value is only needed to be compared with the judgment critical value to judge whether phase failure exists or not, namely step S15.
According to the input open-phase detection method provided by the application, when the input voltage of the three-phase line is the preset minimum input voltage, a first minimum voltage value output by the output end of the detection signal is obtained; acquiring a second minimum voltage value output by the detection signal output end when the phase-missing input of the three-phase line is acquired and the input voltage is a preset highest input voltage; judging whether the difference value between the first minimum voltage value and the second minimum voltage value is larger than a preset difference value or not; if the voltage is larger than the first threshold value, acquiring a middle value of the first minimum voltage value and the second minimum voltage value as a judgment threshold value; judging whether the phase is out or not according to the judgment critical value and the real-time output voltage. The method only needs to compare the real-time voltage value with the judgment critical value to judge whether the phase is lost, the phase loss detection can be carried out in the whole range of the three-phase input voltage, and the phase loss detection can be carried out on different power grid voltages on site, so that the applicability is strong. The method solves the problem that the PWM can be rapidly judged and immediately turned off without periodic detection under the condition of power failure of the film capacitor system, and avoids breakdown of a power module caused by overhigh voltage due to superposition of line voltage output on bus voltage under the condition of power failure. The system is prevented from being unstable or damaged due to the fact that the voltage oscillation of the bus of the film capacitor is caused by the fact that the film capacitor system is not protected in time in the phase-failure state, and the misjudgment of the phase failure caused by the fact that the voltage frequency or the voltage amplitude of the bus is calculated incorrectly under the condition of power grid distortion is avoided.
According to the above embodiment, if the difference between the first minimum voltage value and the second minimum voltage value is smaller than the preset difference, the method further includes:
and adjusting the first voltage dividing resistor until the difference value between the first minimum voltage value and the second minimum voltage value is larger than a preset difference value.
The first voltage dividing resistor is adjusted so that the difference value between the first minimum voltage value and the second minimum voltage value is larger than a preset difference value.
After determining the judgment critical value, the steps S11 to S14 are not repeated in the subsequent use of the control system, and only the real-time voltage value is compared with the judgment critical value to judge whether the phase is lost, namely, step S15: judging whether phase failure exists according to the judgment critical value and the real-time output voltage, comprising the following steps:
if the real-time output voltage is smaller than the judgment critical value, the phase-failure state is obtained;
if the real-time output voltage is not less than the judgment critical value, the state is normal.
The current phase-failure state or normal state can be determined by judging the magnitude relation between the real-time output voltage value and the judgment critical value.
According to the above embodiment, preferably, the input open-phase detection circuit further includes: a filter circuit; the input end of the filter circuit is connected with the output end of the detection signal, and the output end of the filter circuit is connected with the controller; the controller is a micro control unit; correspondingly, when the input voltage of the three-phase line is the preset minimum input voltage, the first minimum voltage value output by the detection signal output end is obtained, and the method comprises the following steps:
the voltage signal of the AD (analog-digital conversion, analog to digital) sampling port of the micro control unit (Microcontroller Unit; MCU) is read by the upper computer, and the minimum voltage signal in one period is used as a first minimum voltage value.
As shown in fig. 1, the input end of the filter circuit is connected with the output end of the detection signal, and the output end of the filter circuit is connected with the micro-control unit; in this embodiment, the filter circuit is an RC filter circuit, and includes a third resistor R3 and a first capacitor C1, where the output end of the detection signal is connected to the first end of the third resistor R3, and the second end of the third resistor R3 is connected to the first end of the first capacitor C1 and the output end T/AC of the filter circuit, and the second end of the first capacitor C1 is grounded.
The output end T/AC of the filter circuit is directly connected with an AD sampling port of the micro-control unit, voltage signals are obtained and converted into corresponding AD values, the AD values are read through an upper computer, the minimum voltage signal in a preset period is used as a first minimum voltage value, and the preset period is required to be larger than or equal to a power input period. Preferably, the preset period is larger than two power input periods, so that the maximum and minimum coverage values of sampled data and the reliability of sampled data samples are ensured.
Correspondingly, when the phase-missing input of the three-phase line is obtained and the input voltage is the preset highest input voltage, the second minimum voltage value output by the detection signal output end comprises:
and reading voltage signals of an AD sampling port of the micro control unit when the phase line of the three-phase line is in open-phase input and the input voltage is the preset highest input voltage through the upper computer, and taking the minimum voltage signal in one period as a second minimum voltage value.
According to the scheme provided by the embodiment, the input voltage is divided through the voltage dividing resistor and sampled to the AD sampling port of the MCU, the circuit is simple, the cost is low, no optocoupler exists, no switching action exists, the heating is less, and the circuit reliability is high.
In addition, the real-time reading time interval is not suitable to be too long, and the open-phase judgment is easy to lag due to the too long time, so that the system is damaged when the PWM is not turned off. Preferably, the read interval is within the us level, or is read through the main function main ().
In addition, if there is no micro control unit, the embodiment further provides a preferred solution, and the input open-phase detection circuit further includes: a filter circuit and an oscilloscope; the input end of the filter circuit is connected with the detection signal output end, the output end of the filter circuit is connected with the oscilloscope, and the oscilloscope is connected with the controller; correspondingly, when the input voltage of the three-phase line is the preset minimum input voltage, the first minimum voltage value output by the detection signal output end is obtained, and the method comprises the following steps:
and acquiring a voltage signal read by the oscilloscope, and taking the minimum voltage signal in a preset period as a first minimum voltage value.
Correspondingly, when the phase-missing input of the three-phase line is obtained and the input voltage is the preset highest input voltage, the second minimum voltage value output by the detection signal output end comprises:
and acquiring a voltage signal when the oscilloscope reads the open-phase input of the three-phase line and the input voltage is the preset highest input voltage, and taking the minimum voltage signal in the preset period as a second minimum voltage value.
In the above embodiments, the input open-phase detection method is described in detail, and the present application further provides a corresponding embodiment of the input open-phase detection device. It should be noted that the present application describes an embodiment of the device portion from two angles, one based on the angle of the functional module and the other based on the angle of the hardware.
Based on the angle of functional module, input open-phase detection device is applied to input open-phase detection circuit, includes: the first rectifying diode D1, the second rectifying diode D2, the third rectifying diode D3, the first voltage dividing resistor R1, the second voltage dividing resistor R2, the clamping circuit and the controller, wherein the first rectifying diode D1, the second rectifying diode D2 and the third rectifying diode D3 are respectively connected with the first phase line L1, the second phase line L2 and the third phase line L3, the other ends of the first rectifying diode D1, the second rectifying diode D2 and the third rectifying diode D3 are respectively connected with the first end of the voltage dividing resistor R1, the first end of the first voltage dividing resistor R1 clamping circuit, the first end of the second voltage dividing resistor R2 and the detection signal output end U1 are connected with the controller, and the second end of the second voltage dividing resistor R2 is grounded;
fig. 3 is a structural diagram of an input open-phase detection device provided in an embodiment of the present application, as shown in fig. 3, the device includes:
the first obtaining module 31 is configured to obtain a first minimum voltage value output by the detection signal output end when the input voltage of the three-phase line is a preset minimum input voltage;
the second obtaining module 32 is configured to obtain a second minimum voltage value output by the detection signal output end when the phase line of the three-phase line is open-phase and the input voltage is a preset maximum input voltage;
a judging module 33, configured to judge whether the difference between the first minimum voltage value and the second minimum voltage value is greater than a preset difference; if so, the setting module 34 is triggered;
a setting module 34, configured to obtain an intermediate value between the first minimum voltage value and the second minimum voltage value as a judgment threshold value;
the detection module 35 is configured to determine whether the phase is absent according to the determination threshold and the real-time output voltage.
With the input open-phase detection device provided in this embodiment, when the input voltage of the three-phase line is the preset minimum input voltage, the first obtaining module 31 obtains the first minimum voltage value output by the detection signal output end; the second obtaining module 32 obtains a second minimum voltage value output by the detection signal output end when the phase line of the three phases is in open-phase input and the input voltage is a preset maximum input voltage; a judging module 33, configured to judge whether the difference between the first minimum voltage value and the second minimum voltage value is greater than a preset difference; if the value is greater than the first threshold value, the trigger setting module 34 obtains an intermediate value between the first minimum voltage value and the second minimum voltage value as a judgment threshold value; the detection module 35 determines whether the phase is lost according to the determination threshold and the real-time output voltage. The phase-failure detection method and device can perform phase-failure detection in the whole range of three-phase input voltage, and can perform phase-failure detection on different power grid voltages on site, and the applicability is strong. The method solves the problem that the PWM can be rapidly judged and immediately turned off without periodic detection under the condition of power failure of the film capacitor system, and avoids breakdown of a power module caused by overhigh voltage due to superposition of line voltage output on bus voltage under the condition of power failure. The system is prevented from being unstable or damaged due to the fact that the voltage oscillation of the bus of the film capacitor is caused by the fact that the film capacitor system is not protected in time in the phase-failure state, and the misjudgment of the phase failure caused by the fact that the voltage frequency or the voltage amplitude of the bus is calculated incorrectly under the condition of power grid distortion is avoided.
Since the embodiments of the apparatus portion and the embodiments of the method portion correspond to each other, the embodiments of the apparatus portion are referred to the description of the embodiments of the method portion, and are not repeated herein.
Fig. 4 is a block diagram of another input open-phase detection device according to an embodiment of the present application, as shown in fig. 4, the input open-phase detection device includes: a memory 40 for storing a computer program;
a processor 41 for implementing the steps of the method of acquiring user operation habit information according to the above-described embodiment (input phase failure detection method) when executing a computer program.
The input phase-failure detection device provided in this embodiment may include, but is not limited to, a smart phone, a tablet computer, a notebook computer, a desktop computer, or the like.
Processor 41 may include one or more processing cores, such as a 4-core processor, an 8-core processor, etc., among others. The processor 41 may be implemented in hardware in at least one of a digital signal processor (Digital Signal Processor, DSP), a Field programmable gate array (Field-Programmable Gate Array, FPGA), a programmable logic array (Programmable Logic Array, PLA). The processor 41 may also comprise a main processor, which is a processor for processing data in an awake state, also called central processor (Central Processing Unit, CPU), and a coprocessor; a coprocessor is a low-power processor for processing data in a standby state. In some embodiments, the processor 41 may be integrated with an image processor (Graphics Processing Unit, GPU) for rendering and rendering of content required to be displayed by the display screen. In some embodiments, the processor 41 may also include an artificial intelligence (Artificial Intelligence, AI) processor for processing computing operations related to machine learning.
Memory 40 may include one or more computer-readable storage media, which may be non-transitory. Memory 40 may also include high-speed random access memory, as well as non-volatile memory, such as one or more magnetic disk storage devices, flash memory storage devices. In this embodiment, the memory 40 is at least used for storing a computer program 401, where the computer program, when loaded and executed by the processor 41, can implement the relevant steps of the input phase failure detection method disclosed in any of the foregoing embodiments. In addition, the resources stored in the memory 40 may further include an operating system 402, data 403, and the like, where the storage manner may be transient storage or permanent storage. Operating system 402 may include, among other things, windows, unix, linux. The data 403 may include, but is not limited to, data related to implementing the input open-phase detection method, etc.
In some embodiments, the input phase failure detection device may further include a display screen 42, an input/output interface 43, a communication interface 44, a power supply 45, and a communication bus 46.
It will be appreciated by those skilled in the art that the configuration shown in fig. 4 is not limiting of the input phase loss detection device and may include more or fewer components than shown.
The input open-phase detection device provided by the embodiment of the application comprises a memory and a processor, wherein when the processor executes a program stored in the memory, the processor can realize the following method: the input phase-failure detection method comprises the steps of obtaining a first minimum voltage value output by a detection signal output end when the input voltage of a three-phase line is a preset minimum input voltage; acquiring a second minimum voltage value output by the detection signal output end when the phase-missing input of the three-phase line is acquired and the input voltage is a preset highest input voltage; judging whether the difference value between the first minimum voltage value and the second minimum voltage value is larger than a preset difference value or not; if the voltage is larger than the first threshold value, acquiring a middle value of the first minimum voltage value and the second minimum voltage value as a judgment threshold value; judging whether the phase is out or not according to the judgment critical value and the real-time output voltage. The method only needs to compare the real-time voltage value with the judgment critical value to judge whether the phase is lost, the phase loss detection can be carried out in the whole range of the three-phase input voltage, and the phase loss detection can be carried out on different power grid voltages on site, so that the applicability is strong. The method solves the problem that the PWM can be rapidly judged and immediately turned off without periodic detection under the condition of power failure of the film capacitor system, and avoids breakdown of a power module caused by overhigh voltage due to superposition of line voltage output on bus voltage under the condition of power failure. The system is prevented from being unstable or damaged due to the fact that the voltage oscillation of the bus of the film capacitor is caused by the fact that the film capacitor system is not protected in time in the phase-failure state, and the misjudgment of the phase failure caused by the fact that the voltage frequency or the voltage amplitude of the bus is calculated incorrectly under the condition of power grid distortion is avoided.
Finally, the present application also provides a corresponding embodiment of the computer readable storage medium. The computer-readable storage medium has stored thereon a computer program which, when executed by a processor, performs the steps described in the above-described embodiments of the input phase failure detection method.
It will be appreciated that the methods of the above embodiments, if implemented in the form of software functional units and sold or used as stand-alone products, may be stored on a computer readable storage medium. Based on such understanding, the technical solution of the present application may be embodied essentially or in part or all of the technical solution contributing to the prior art, or in a software product stored in a storage medium, performing all or part of the steps of the methods of the various embodiments of the present application. And the aforementioned storage medium includes: a U-disk, a removable hard disk, a Read-Only Memory (ROM), a random access Memory (Random Access Memory, RAM), a magnetic disk, or an optical disk, or other various media capable of storing program codes.
The computer readable storage medium provided in this embodiment has a computer program stored thereon, which when executed by a processor, can implement the following method: the input phase-failure detection method comprises the steps of obtaining a first minimum voltage value output by a detection signal output end when the input voltage of a three-phase line is a preset minimum input voltage; acquiring a second minimum voltage value output by the detection signal output end when the phase-missing input of the three-phase line is acquired and the input voltage is a preset highest input voltage; judging whether the difference value between the first minimum voltage value and the second minimum voltage value is larger than a preset difference value or not; if the voltage is larger than the first threshold value, acquiring a middle value of the first minimum voltage value and the second minimum voltage value as a judgment threshold value; judging whether the phase is out or not according to the judgment critical value and the real-time output voltage. The method only needs to compare the real-time voltage value with the judgment critical value to judge whether the phase is lost, the phase loss detection can be carried out in the whole range of the three-phase input voltage, and the phase loss detection can be carried out on different power grid voltages on site, so that the applicability is strong. The method solves the problem that the PWM can be rapidly judged and immediately turned off without periodic detection under the condition of power failure of the film capacitor system, and avoids breakdown of a power module caused by overhigh voltage due to superposition of line voltage output on bus voltage under the condition of power failure. The system is prevented from being unstable or damaged due to the fact that the voltage oscillation of the bus of the film capacitor is caused by the fact that the film capacitor system is not protected in time in the phase-failure state, and the misjudgment of the phase failure caused by the fact that the voltage frequency or the voltage amplitude of the bus is calculated incorrectly under the condition of power grid distortion is avoided.
The input open-phase detection method, the input open-phase detection device and the input open-phase detection medium provided by the application are described in detail. In the description, each embodiment is described in a progressive manner, and each embodiment is mainly described by the differences from other embodiments, so that the same similar parts among the embodiments are mutually referred. For the device disclosed in the embodiment, since it corresponds to the method disclosed in the embodiment, the description is relatively simple, and the relevant points refer to the description of the method section. It should be noted that it would be obvious to those skilled in the art that various improvements and modifications can be made to the present application without departing from the principles of the present application, and such improvements and modifications fall within the scope of the claims of the present application.
It should also be noted that in this specification, relational terms such as first and second, and the like are used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Moreover, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising one … …" does not exclude the presence of other like elements in a process, method, article, or apparatus that comprises the element.
Claims (10)
1. An input open-phase detection method is characterized by being applied to an input open-phase detection circuit and comprising the following steps: the device comprises a first rectifying diode, a second rectifying diode, a third rectifying diode, a first voltage dividing resistor, a second voltage dividing resistor, a clamping circuit and a controller, wherein the first rectifying diode, the second rectifying diode and the third rectifying diode are respectively connected with a first phase line, a second phase line and a third phase line, the other ends of the first rectifying diode, the second rectifying diode and the third rectifying diode are respectively connected with a first end of the voltage dividing resistor, a second end of the voltage dividing resistor is connected with the clamping circuit, a first end of the second voltage dividing resistor and a detection signal output end, the detection signal output end is connected with the controller, and the second end of the second voltage dividing resistor is grounded;
the method comprises the following steps:
when the input voltage of the three-phase line is the preset minimum input voltage, a first minimum voltage value output by the detection signal output end is obtained;
acquiring a second minimum voltage value output by the detection signal output end when the phase-missing input of the three-phase line is acquired and the input voltage is a preset highest input voltage;
judging whether the difference value between the first minimum voltage value and the second minimum voltage value is larger than a preset difference value or not;
if the value is larger than the first minimum voltage value, acquiring an intermediate value of the first minimum voltage value and the second minimum voltage value as a judgment critical value;
and judging whether the phase is lost or not according to the judgment critical value and the real-time output voltage.
2. The input phase loss detection method according to claim 1, wherein the preset minimum input voltage is 220V and the preset maximum input voltage is 520V.
3. The input phase-failure detection method according to claim 2, further comprising, if the difference between the first minimum voltage value and the second minimum voltage value is smaller than a preset difference:
and adjusting the first voltage dividing resistor until the difference value between the first minimum voltage value and the second minimum voltage value is larger than the preset difference value.
4. The input phase failure detection method according to claim 3, wherein the preset difference is 0.2V.
5. The method of claim 1, wherein determining whether the phase is lost based on the determination threshold and the real-time output voltage comprises:
if the real-time output voltage is smaller than the judgment critical value, the real-time output voltage is in a phase-failure state;
and if the real-time output voltage is not smaller than the judgment critical value, the real-time output voltage is in a normal state.
6. The input phase-loss detection method according to claim 1, wherein the input phase-loss detection circuit further comprises: a filter circuit; the input end of the filter circuit is connected with the detection signal output end, and the output end of the filter circuit is connected with the controller; the controller is a micro control unit; correspondingly, when the obtained three-phase line input voltage is the preset minimum input voltage, the first minimum voltage value output by the detection signal output end comprises:
and reading the voltage signal of the AD sampling port of the micro control unit through an upper computer, and taking the minimum voltage signal in a preset period as the first minimum voltage value.
7. The input phase-loss detection method according to claim 1, wherein the input phase-loss detection circuit further comprises: a filter circuit and an oscilloscope; the input end of the filter circuit is connected with the detection signal output end, the output end of the filter circuit is connected with an oscilloscope, and the oscilloscope is connected with the controller; correspondingly, when the obtained three-phase line input voltage is the preset minimum input voltage, the first minimum voltage value output by the detection signal output end comprises:
and acquiring the voltage signal read by the oscilloscope, and taking the minimum voltage signal in a preset period as the first minimum voltage value.
8. An input open-phase detection device, characterized in that it is applied to an input open-phase detection circuit, comprising: the device comprises a first rectifying diode, a second rectifying diode, a third rectifying diode, a first voltage dividing resistor, a second voltage dividing resistor, a clamping circuit and a controller, wherein the first rectifying diode, the second rectifying diode and the third rectifying diode are respectively connected with a first phase line, a second phase line and a third phase line, the other ends of the first rectifying diode, the second rectifying diode and the third rectifying diode are respectively connected with a first end of the voltage dividing resistor, a second end of the voltage dividing resistor is connected with the clamping circuit, a first end of the second voltage dividing resistor and a detection signal output end, the detection signal output end is connected with the controller, and the second end of the second voltage dividing resistor is grounded;
the device comprises:
the first acquisition module is used for acquiring a first minimum voltage value output by the detection signal output end when the input voltage of the three-phase line is a preset minimum input voltage;
the second acquisition module is used for acquiring a second minimum voltage value output by the detection signal output end when the phase-missing input of the three-phase line is carried out and the input voltage is the preset highest input voltage;
the judging module is used for judging whether the difference value between the first minimum voltage value and the second minimum voltage value is larger than a preset difference value or not; if the set value is larger than the set value, triggering the setting module;
the setting module is used for obtaining the intermediate value of the first minimum voltage value and the second minimum voltage value as a judgment critical value;
and the detection module is used for judging whether the phase is out of phase or not according to the judgment critical value and the real-time output voltage.
9. An input phase failure detection device, comprising:
a memory for storing a computer program;
a processor for implementing the steps of the input phase failure detection method according to any one of claims 1 to 7 when executing the computer program.
10. A computer readable storage medium, characterized in that the computer readable storage medium has stored thereon a computer program which, when executed by a processor, implements the steps of the input phase failure detection method according to any of claims 1 to 7.
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| CN118053715A (en) * | 2024-03-07 | 2024-05-17 | 保定市冀能电力自动化设备有限公司 | Control system of electric control drop-out fuse with open-phase protection function |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN118053715A (en) * | 2024-03-07 | 2024-05-17 | 保定市冀能电力自动化设备有限公司 | Control system of electric control drop-out fuse with open-phase protection function |
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