CN109406890B - Three-phase AC input open-phase detection method, system, equipment and storage medium - Google Patents
Three-phase AC input open-phase detection method, system, equipment and storage medium Download PDFInfo
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Abstract
The embodiment of the invention provides a method, a system, equipment and a storage medium for detecting three-phase alternating current input open phase, wherein the method comprises the following steps: acquiring the direct current bus voltage and the output power of the power electronic conversion equipment in real time, and performing band-pass filtering processing; acquiring a first fluctuation frequency and amplitude of the direct-current bus voltage subjected to band-pass filtering and a second fluctuation frequency and amplitude of the output power subjected to band-pass filtering; judging whether the first fluctuation frequency and the amplitude meet a first preset condition or not and whether the second fluctuation frequency and the amplitude do not meet a second preset condition or not; and if so, performing phase-lack timing, and outputting phase-lack fault warning information when the phase-lack timing reaches a preset value. The embodiment of the invention can improve the phase-lack detection precision and avoid misjudgment caused by output frequency fluctuation.
Description
Technical Field
The embodiment of the invention relates to the field of power electronic conversion equipment, in particular to a three-phase alternating current input open-phase detection method, a three-phase alternating current input open-phase detection system, three-phase alternating current input open-phase detection equipment and a storage medium.
Background
The input open-phase detection is an input protection detection mechanism in a power electronic conversion device such as a three-phase direct current and alternating current direct current power supply or a frequency converter. When one phase of a three-phase input power grid cannot supply power for alternating current and direct current conversion due to some reason, the three-phase input power grid needs to be detected quickly and stops running immediately, so that the condition that alternating current and direct current conversion equipment is overloaded due to two-phase power supply or equipment damage is caused due to overlarge fluctuation of bus voltage is avoided.
The traditional input open-phase detection method is mainly used for judging open-phase by adding an open-phase detection hardware circuit or by adding a voltage or current sampling circuit and a device on the input side of a power grid to sample the voltage or current input to the power grid. This method of input open-phase detection undoubtedly increases the hardware cost of the system.
As shown in fig. 1, in some cases, for example, a three-phase input circuit is an uncontrollable rectifying circuit composed of diodes D1-D6, so that it can be realized to determine an input open-phase by using a bus voltage and an output instantaneous power without increasing hardware cost. According to the scheme, voltage or current on the input side does not need to be detected, and whether the phase is open or not is judged only by detecting the fluctuating frequency of the bus and the fluctuating peak-to-peak value. However, the currently adopted method for judging the input open-phase by using the bus voltage and the output instantaneous power has the following defects:
1) the detection of alternating current fluctuation frequency and amplitude of the bus voltage is influenced due to the fact that a large direct current component exists in the bus voltage, and the bus voltage is often pulled high or pulled low due to the change of load power on an output side, so that the calculation of the fluctuation frequency and the peak value of the bus voltage is prone to errors;
2) due to the fluctuation of the output power, even if no open phase exists, the bus voltage may fluctuate similarly to the open phase, and erroneous judgment is likely to occur.
Disclosure of Invention
The embodiment of the invention provides a novel three-phase alternating-current input open-phase detection method, a system, equipment and a storage medium, aiming at the problems that the calculation of the fluctuation frequency and the peak value of the bus voltage which are easy to generate misjudgment and are easy to generate misjudgment in the conventional method for judging the input open-phase by utilizing the bus voltage and the output instantaneous power is easy to make mistakes and the misjudgment is easy to generate due to the influence of the output power fluctuation.
The technical solution for solving the above technical problem in the embodiments of the present invention is to provide a three-phase ac input open-phase detection method, which is applied to a three-phase input power electronic conversion device, and the three-phase ac input open-phase detection method includes:
acquiring direct-current bus voltage and output power of the power electronic conversion equipment in real time, and performing band-pass filtering processing on the direct-current bus voltage and the output power;
acquiring a first fluctuation frequency and amplitude of the direct-current bus voltage subjected to band-pass filtering and a second fluctuation frequency and amplitude of the output power subjected to band-pass filtering;
judging whether the first fluctuation frequency and the amplitude meet a first preset condition or not, and whether the second fluctuation frequency and the amplitude meet a second preset condition or not;
if the first fluctuation frequency and the amplitude meet the first preset condition and the second fluctuation frequency and the amplitude do not meet the second preset condition, performing phase-lack timing, and outputting phase-lack fault warning information when the phase-lack timing reaches a preset value; alternatively, the first and second electrodes may be,
and if the first fluctuation frequency and the amplitude do not meet the first preset condition, or the second fluctuation frequency and the amplitude meet the second preset condition, clearing the open-phase timer and not reporting the open-phase fault.
Preferably, the first preset condition is that: the first fluctuation frequency of the direct current bus voltage is in a first preset range, and the first fluctuation amplitude of the direct current bus voltage exceeds a first threshold value;
the second preset condition is as follows: the second fluctuation frequency of the output power is in a second preset range and the second fluctuation amplitude of the output power exceeds a second threshold value.
Preferably, the first preset range and the second preset range are both twice of the allowable fluctuation range of the frequency of the three-phase alternating-current input voltage.
Preferably, the band-pass filtering processing is performed on the direct-current bus voltage and the output power, and includes;
and performing band-pass filtering processing on the direct-current bus voltage and the output power by adopting a band-pass filter with a preset frequency band-pass, wherein the preset frequency is twice of the frequency of the three-phase alternating-current input voltage.
The embodiment of the invention also provides a three-phase alternating current input open-phase detection system, which is applied to three-phase input power electronic conversion equipment, and comprises the following components:
the band-pass filtering unit is used for acquiring the direct-current bus voltage and the output power of the power electronic conversion equipment in real time and carrying out band-pass filtering processing on the direct-current bus voltage and the output power;
the fluctuation frequency and amplitude detection unit is used for acquiring a first fluctuation frequency and amplitude of the direct-current bus voltage after the band-pass filtering processing and a second fluctuation frequency and amplitude of the output power after the band-pass filtering processing;
the judging unit is used for judging whether the first fluctuation frequency and the amplitude meet a first preset condition or not and whether the second fluctuation frequency and the amplitude meet a second preset condition or not;
a phase failure alarm unit for:
if the first fluctuation frequency and the amplitude meet the first preset condition and the second fluctuation frequency and the amplitude do not meet the second preset condition, performing phase-lack timing, and outputting phase-lack fault warning information when the phase-lack timing reaches a preset value; alternatively, the first and second electrodes may be,
and if the first fluctuation frequency and the amplitude do not meet the first preset condition, or the second fluctuation frequency and the amplitude meet the second preset condition, clearing the open-phase timer and not reporting the open-phase fault.
Preferably, the first preset condition is that: the first fluctuation frequency of the direct current bus voltage is in a first preset range, and the first fluctuation amplitude of the direct current bus voltage exceeds a first threshold value;
the second preset condition is as follows: the second fluctuation frequency of the output power is in a second preset range and the second fluctuation amplitude of the output power exceeds a second threshold value.
Preferably, the first preset range and the second preset range are both twice of the allowable fluctuation range of the frequency of the three-phase alternating-current input voltage.
Preferably, the band-pass filtering unit is specifically configured to;
and performing band-pass filtering processing on the direct-current bus voltage and the output power by adopting a band-pass filter with a preset frequency band-pass, wherein the preset frequency is twice of the frequency of the three-phase alternating-current input voltage.
The embodiment of the present invention further provides a power electronic conversion device, which includes a memory and a processor, where the memory stores a computer program operable on the processor, and the processor implements the steps of the method when executing the computer program.
An embodiment of the present invention further provides a computer-readable storage medium, where a computer program is stored on the computer-readable storage medium, and when the computer program is executed by a processor, the steps of the method are implemented.
According to the three-phase alternating current input open-phase detection method, the three-phase alternating current input open-phase detection system, the three-phase alternating current input open-phase detection equipment and the three-phase alternating current input open-phase detection storage medium, before open-phase judgment, the acquired direct current bus voltage and the acquired output power of the power electronic conversion equipment are subjected to band-pass filtering processing, and direct current component components and high-frequency fluctuation in the direct current bus voltage and the output power are filtered, so that the detection precision of alternating current fluctuation frequency and amplitude in the direct current bus voltage and the output power can be improved; when the first fluctuation frequency and the amplitude of the direct current bus voltage meet the first preset condition and the second fluctuation frequency and the amplitude of the output power do not meet the second preset condition, the phase-lack timing is carried out, and the phase-lack fault warning information is output when the phase-lack timing reaches the preset value, so that the misjudgment caused by the fluctuation of the output power can be avoided, and the phase-lack detection precision is improved.
Drawings
FIG. 1 is a schematic diagram of a three-phase AC input voltage conversion using a three-phase uncontrolled rectifier circuit;
FIG. 2 is a schematic flow chart of a method for detecting a phase loss of a three-phase AC input according to an embodiment of the present invention;
fig. 3 is a schematic flow chart of acquiring a frequency of a bus voltage fluctuation amount in the three-phase ac input open-phase detection method according to the embodiment of the present invention;
FIG. 4 is a waveform diagram of the frequency of the fluctuation amount of the bus voltage in the method for detecting the phase loss of the three-phase AC input according to the embodiment of the present invention;
fig. 5 is a schematic flow chart illustrating the process of obtaining the amplitude of the bus voltage fluctuation in the three-phase ac input phase loss detection method according to the embodiment of the present invention;
FIG. 6 is a waveform diagram of the amplitude of the bus voltage fluctuation in the three-phase AC input open-phase detection method according to the embodiment of the present invention;
fig. 7 is a schematic flow chart illustrating the method for detecting a phase loss of a three-phase ac input according to another embodiment of the present invention to obtain an amplitude of a bus voltage fluctuation;
FIG. 8 is another waveform diagram illustrating the amplitude of the bus voltage fluctuation in the method for detecting a phase loss in a three-phase AC input according to another embodiment of the present invention;
fig. 9 is a waveform diagram of the frequency of the output power fluctuation amount in the three-phase ac input open-phase detection method according to another embodiment of the present invention;
fig. 10 is a schematic flow chart illustrating the process of obtaining the amplitude of the output power fluctuation in the three-phase ac input open-phase detection method according to another embodiment of the present invention;
fig. 11 is a schematic flow chart illustrating the process of obtaining the amplitude of the output power fluctuation in the three-phase ac input open-phase detection method according to another embodiment of the present invention;
FIG. 12 is a schematic diagram of a three-phase AC input open-phase detection system provided by an embodiment of the present invention;
fig. 13 is a schematic diagram of a power electronic conversion device provided by an embodiment of the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is described in further detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.
In a power electronic conversion device such as a three-phase direct current power supply, an alternating current direct current power supply or a frequency converter, when a load is not changed and the device normally operates, the bus voltage subjected to three-phase uncontrolled rectification has frequency multiplication fluctuation of three-phase input voltage frequency 6, when the input phase is lack, the bus voltage has frequency multiplication fluctuation of three-phase input voltage frequency 2, and the larger the output load is, the larger the bus voltage fluctuation is.
Fig. 2 is a schematic diagram of a three-phase ac input open-phase detection method according to an embodiment of the present invention, which can be applied to power electronic conversion equipment such as a three-phase ac/dc power supply, an ac/dc power supply, or a frequency converter. In these devices, a three-phase alternating input voltage (e.g. the mains voltage) is converted into a bus voltage by three-phase uncontrolled rectification. The three-phase alternating current input phase loss detection method of the embodiment comprises the following steps:
step S1: the method comprises the steps of collecting the voltage and the output power of a direct current bus of the power electronic conversion equipment in real time, and carrying out band-pass filtering processing on the voltage and the output power of the direct current bus.
Because when three-phase alternating current input is not lack of phase, the bus voltage can continuously rise or fall along with the change of output power, and if the output power is changed regularly at 100hz, the bus voltage can fluctuate at 100 hz. In the step, the bus voltage Udc needs to be subjected to band-pass filtering, and specifically, the filtering transfer function is as follows:
Udc_bp＝(s×(ω/Q))/(s2+s×(ω/Q)+ω×ω) (1)
in the transfer function, Udc _ bp is the bus voltage fluctuation amount, ω is the band-pass angular frequency and ω is 2 × pi × f, f is the band-pass frequency, the preset frequency band-pass is taken, Q is the quality factor, and s is the complex variable.
In this step, the instantaneous output power may be calculated by obtaining the load voltage and current, for example, when the dc bus connects the inverter, the instantaneous output power may be calculated by obtaining the output current of the inverter and the output voltage of the current regulator. The filter transfer function for band-pass filtering the instantaneous output power can be expressed by equation (1).
In particular, the step may be performed by performing bandpass filtering on the dc bus voltage and the output power by using a bandpass filter having a preset frequency bandpass, where the preset frequency bandpass of the bandpass filter may be twice the frequency of the three-phase ac input voltage, that is, the preset frequency bandpass may be 100hz when the frequency of the three-phase ac input voltage is 50 hz.
Step S2: and acquiring a first fluctuation frequency and amplitude of the direct-current bus voltage subjected to the band-pass filtering processing and a second fluctuation frequency and amplitude of the output power subjected to the band-pass filtering processing.
Specifically, as shown in fig. 3 and 4, the first fluctuation frequency of the dc bus voltage after the band-pass filtering process may be obtained by:
step S111: and counting when the direct current bus voltage after the band-pass filtering processing is changed from being smaller than zero to being larger than zero (or from being larger than zero to being smaller than zero), so that the corresponding counter is accumulated at a fixed period from zero.
Step S112: and stopping counting and reading the count value of the counter when the direct current bus voltage after the band-pass filtering processing changes from less than zero to more than zero (or changes from more than zero to less than zero) again.
Step S113: and calculating the first fluctuation frequency of the bus voltage at the current time according to the count value obtained in the step S112, clearing the counter after the calculation is finished, returning to the step S111, and performing the next counting. Specifically, the following calculation formula (2) may be used in this step to calculate the first fluctuation frequency of the bus voltage at the present time:
fudc＝1/(Count×T) (2)
the fudc is a first fluctuation frequency of the bus voltage at the current moment, Count is a counting value of the counter, and T is a counting period of the counter.
As shown in fig. 5 and 6, the amplitude of the dc bus voltage after the band-pass filtering process can be obtained specifically by the following method:
step S121: and taking the absolute value of the voltage of the direct current bus after the band-pass filtering treatment.
Step S122: and (4) performing RC filtering for a preset time (for example, 10ms to 50ms) on the absolute value of the direct-current bus voltage obtained in the step (S121), so as to obtain the equivalent amplitude Udc _ bp _ filt of the bus voltage.
Step S123: and calculating the amplitude Udc _ bp _ pp of the bus voltage according to the bus voltage equivalent amplitude Udc _ bp _ filt, wherein the bus voltage equivalent amplitude Udc _ bp _ filt is linearly related to the bus voltage amplitude Udc _ bp _ pp.
In addition, as shown in fig. 7 and 8, the amplitude of the dc bus voltage after the band-pass filtering process can be obtained by:
step S131: and searching the maximum value Udc _ bp _ max and the minimum value Udc _ bp _ min of the bus voltage when the direct-current bus voltage after the band-pass filtering processing changes from less than zero to more than zero (or from more than zero to less than zero).
Step S132: when the bus voltage changes from less than zero to more than zero (or from more than zero to less than zero) again, the magnitude of the bus voltage is calculated from the maximum value Udc _ bp _ max and the minimum value Udc _ bp _ min of the bus voltage obtained in step (S131). Specifically, the amplitude Udc _ bp _ pp of the bus voltage may be calculated by the following calculation formula (3):
Udc_bp_pp＝(Udc_bp_max-Udc_bp_min) (3)
the second fluctuation frequency and amplitude of the output power after the band-pass filtering processing can be obtained by adopting the same method. Specifically, as shown in fig. 9, the second fluctuation frequency of the output power after the band-pass filtering process can be obtained by:
step S211: when the output power after the band-pass filtering process is changed from less than zero to more than zero (or from more than zero to less than zero), counting is started, and the corresponding counter is accumulated at a fixed period from zero.
Step S212: when the output power after the band-pass filtering process changes from less than zero to more than zero (or from more than zero to less than zero), the counting is stopped and the count value of the counter is read.
Step S213: and calculating the second frequency of the output power subjected to the band-pass filtering processing at the current moment according to the count value read in the step S212.
As shown in fig. 10, the amplitude of the output power after the band-pass filtering process can be obtained by:
step S221: and taking the absolute value of the output power after the band-pass filtering processing.
Step S222: and performing RC filtering for a preset time (for example, 10ms to 50ms) on the absolute value obtained in step S221, so as to obtain an equivalent amplitude of the output power.
Step S223: and calculating the amplitude of the output power according to the equivalent amplitude of the output power, wherein the equivalent amplitude of the output power is linearly related to the amplitude of the output power.
As shown in fig. 11, the amplitude of the output power after the band-pass filtering process can also be obtained by:
step S231: searching the maximum value and the minimum value of the output power when the output power after the band-pass filtering processing is changed from being smaller than zero to being larger than zero (or from being larger than zero to being smaller than zero);
step S232: when the output power changes from less than zero to more than zero (or from more than zero to less than zero) again, the amplitude of the output power after the band-pass filtering process is calculated from the maximum value and the minimum value of the output power obtained in step S231.
Step S3: and judging whether the first fluctuation frequency and the amplitude meet a first preset condition or not and whether the second fluctuation frequency and the amplitude meet a second preset condition or not. Executing step S4 when the first fluctuation frequency and amplitude satisfy a first preset condition and the second fluctuation frequency and amplitude do not satisfy a second preset condition; the step S5 is performed when the first fluctuation frequency and amplitude do not satisfy the first preset condition, or the second fluctuation frequency and amplitude satisfy the second preset condition.
The first preset condition may specifically be: the first frequency of the bus voltage subjected to the band-pass filtering processing is in a preset range, and the amplitude of the bus voltage exceeds a first threshold value; the second preset condition may specifically be: the second frequency of the output power after the band-pass filtering processing is in a preset range, and the amplitude value exceeds a second threshold value. The preset range, the first threshold and the second threshold can be set as required.
In particular, the preset range may be 2 times of the allowable fluctuation range of the frequency of the three-phase ac input voltage, for example, when the rated frequency of the three-phase ac input voltage is 50hz, and the allowable fluctuation range is 45 to 55hz, the preset range is 90 to 110 hz.
Step S4: and performing phase-lack timing, confirming that a phase-lack fault occurs when the phase-lack timing reaches a preset value (the preset value can be set according to the stability requirement of the system), and outputting phase-lack fault alarm information.
Step S5: and clearing the phase-missing timer, not reporting the phase-missing fault, returning to the step S1, and continuing to detect the phase-missing fault at the next moment.
In the three-phase ac input open-phase detection method of this embodiment, when the load is not changed and the normal operation is performed, if the ac input grid voltage frequency is 50h, the bus voltage after diode rectification has fluctuation of 300hz, which is the frequency multiplication of the ac input grid voltage frequency 6, and when the input open-phase is performed, the bus voltage has fluctuation of 100hz, which is the frequency multiplication of the grid voltage frequency 2, and the larger the output load is, the larger the bus fluctuation is.
In addition, according to the three-phase alternating current input open-phase detection method of the embodiment, before open-phase judgment, band-pass filtering processing is firstly performed on the acquired direct current bus voltage and output power of the power electronic conversion equipment, and direct current component components and high-frequency fluctuation in the direct current bus voltage and the output power are filtered, so that the detection precision of alternating current fluctuation frequency and amplitude in the direct current bus voltage and the output power can be improved; meanwhile, when the first fluctuation frequency and the amplitude of the direct-current bus voltage meet the first preset condition and the second fluctuation frequency and the amplitude of the output power do not meet the second preset condition, phase-missing timing is performed, and phase-missing fault warning information is output when the phase-missing timing reaches a preset value, so that misjudgment caused by output power fluctuation can be avoided, and the phase-missing detection precision is improved.
As shown in fig. 12, an embodiment of the present invention further provides a three-phase ac input open-phase detection system, which is applied to a three-phase input power electronic conversion device, where the three-phase ac input open-phase detection system includes a band-pass filtering unit 121, a fluctuation frequency and amplitude detection unit 122, a determination unit 123, and an open-phase fault warning unit 124, where the band-pass filtering unit 121, the fluctuation frequency and amplitude detection unit 122, the determination unit 123, and the open-phase fault warning unit 123 may be integrated into a controller of the power electronic conversion device, and may be implemented by combining software running in the controller.
The band-pass filtering unit 121 is configured to collect the dc bus voltage and the output power of the power electronic conversion device in real time, and perform band-pass filtering processing on the dc bus voltage and the output power. The fluctuation frequency and amplitude detection unit 122 obtains a first fluctuation frequency and amplitude of the dc bus voltage after the band-pass filtering and a second fluctuation frequency and amplitude of the output power after the band-pass filtering. The judging unit 123 is configured to judge whether the first fluctuation frequency and the amplitude satisfy a first preset condition, and whether the second fluctuation frequency and the amplitude satisfy a second preset condition. The phase-missing fault warning unit 124 is configured to perform phase-missing timing when the first fluctuation frequency and the amplitude satisfy the first preset condition and the second fluctuation frequency and the amplitude do not satisfy the second preset condition, and output phase-missing fault warning information when the phase-missing timing reaches a preset value; or when the first fluctuation frequency and the amplitude do not meet the first preset condition or the second fluctuation frequency and the amplitude meet the second preset condition, clearing the open-phase timer and not reporting the open-phase fault.
Preferably, the first preset condition used by the determining unit 123 may specifically be: the first fluctuation frequency of the direct current bus voltage is in a first preset range, and the first fluctuation amplitude of the direct current bus voltage exceeds a first threshold value; accordingly, the second preset condition may be: the second fluctuation frequency of the output power is in a second preset range and the second fluctuation amplitude of the output power exceeds a second threshold value. In particular, the first preset range and the second preset range are both twice of the allowable fluctuation range of the frequency of the three-phase alternating-current input voltage.
As shown in fig. 13, an embodiment of the present invention further provides a power electronic conversion device 13, where the power electronic conversion device 13 may be a three-phase ac/dc power supply, an ac/dc power supply, a frequency converter, or the like. The power electronic conversion device 13 of the present embodiment includes a memory 131 and a processor 132, and a computer program operable on the processor 132 is stored in the memory 131, and the steps of the method described above are implemented when the processor 132 executes the computer program. The power electronic conversion device 13 in this embodiment and the three-phase ac input open-phase detection method in the above embodiments belong to the same concept, and specific implementation processes thereof are detailed in corresponding method embodiments, and technical features in the method embodiments are correspondingly applicable in this device embodiment, and are not described herein again.
An embodiment of the present invention further provides a computer-readable storage medium, where a computer program is stored on the computer-readable storage medium, and when the computer program is executed by a processor, the steps of the method are implemented. The computer-readable storage medium in this embodiment and the three-phase ac input open-phase detection method in the above embodiments belong to the same concept, and specific implementation processes thereof are detailed in corresponding method embodiments, and technical features in the method embodiments are correspondingly applicable in this apparatus embodiment, and are not described herein again.
The above description is only for the preferred embodiment of the present invention, but the scope of the present invention is not limited thereto, and any changes or substitutions that can be easily conceived by those skilled in the art within the technical scope of the present invention are included in the scope of the present invention. Therefore, the protection scope of the present invention shall be subject to the protection scope of the claims.
Claims (8)
1. A three-phase alternating current input open-phase detection method is applied to three-phase input power electronic conversion equipment and is characterized by comprising the following steps:
acquiring direct-current bus voltage and output power of the power electronic conversion equipment in real time, and performing band-pass filtering processing on the direct-current bus voltage and the output power;
acquiring a first fluctuation frequency and amplitude of the direct-current bus voltage subjected to band-pass filtering and a second fluctuation frequency and amplitude of the output power subjected to band-pass filtering;
judging whether the first fluctuation frequency and the amplitude meet a first preset condition or not, and whether the second fluctuation frequency and the amplitude meet a second preset condition or not;
if the first fluctuation frequency and the amplitude meet the first preset condition and the second fluctuation frequency and the amplitude do not meet the second preset condition, performing phase-lack timing, and outputting phase-lack fault warning information when the phase-lack timing reaches a preset value; alternatively, the first and second electrodes may be,
if the first fluctuation frequency and the amplitude do not meet the first preset condition, or the second fluctuation frequency and the amplitude meet the second preset condition, clearing the open-phase timer and not reporting the open-phase fault;
the first preset condition is as follows: the first fluctuation frequency of the direct current bus voltage is in a first preset range, and the first fluctuation amplitude of the direct current bus voltage exceeds a first threshold value;
the second preset condition is as follows: the second fluctuation frequency of the output power is in a second preset range and the second fluctuation amplitude of the output power exceeds a second threshold value.
2. The method according to claim 1, wherein the first predetermined range and the second predetermined range are both twice an allowable fluctuation range of the frequency of the three-phase ac input voltage.
3. The method according to claim 1, wherein the band-pass filtering the dc bus voltage and the output power comprises;
and performing band-pass filtering processing on the direct-current bus voltage and the output power by adopting a band-pass filter with a preset frequency band-pass, wherein the preset frequency is twice of the frequency of the three-phase alternating-current input voltage.
4. A three-phase AC input open-phase detection system is applied to three-phase input power electronic conversion equipment, and is characterized by comprising:
the band-pass filtering unit is used for acquiring the direct-current bus voltage and the output power of the power electronic conversion equipment in real time and carrying out band-pass filtering processing on the direct-current bus voltage and the output power;
the fluctuation frequency and amplitude detection unit is used for acquiring a first fluctuation frequency and amplitude of the direct-current bus voltage after the band-pass filtering processing and a second fluctuation frequency and amplitude of the output power after the band-pass filtering processing;
the judging unit is used for judging whether the first fluctuation frequency and the amplitude meet a first preset condition or not and whether the second fluctuation frequency and the amplitude meet a second preset condition or not;
a phase failure alarm unit for:
if the first fluctuation frequency and the amplitude meet the first preset condition and the second fluctuation frequency and the amplitude do not meet the second preset condition, performing phase-lack timing, and outputting phase-lack fault warning information when the phase-lack timing reaches a preset value; alternatively, the first and second electrodes may be,
if the first fluctuation frequency and the amplitude do not meet the first preset condition, or the second fluctuation frequency and the amplitude meet the second preset condition, clearing the open-phase timer and not reporting the open-phase fault;
the first preset condition is as follows: the first fluctuation frequency of the direct current bus voltage is in a first preset range, and the first fluctuation amplitude of the direct current bus voltage exceeds a first threshold value;
the second preset condition is as follows: the second fluctuation frequency of the output power is in a second preset range and the second fluctuation amplitude of the output power exceeds a second threshold value.
5. A three-phase AC input phase loss detection system as claimed in claim 4 wherein the first and second predetermined ranges are both twice the allowable fluctuation range of the frequency of the three-phase AC input voltage.
6. The system according to claim 4, wherein the band-pass filtering unit is specifically configured to;
and performing band-pass filtering processing on the direct-current bus voltage and the output power by adopting a band-pass filter with a preset frequency band-pass, wherein the preset frequency is twice of the frequency of the three-phase alternating-current input voltage.
7. A power electronic converter device comprising a memory and a processor, the memory having stored therein a computer program operable on the processor, the processor implementing the steps of the method as claimed in any one of claims 1 to 3 when executing the computer program.
8. A computer-readable storage medium, characterized in that a computer program is stored on the computer-readable storage medium, which computer program, when being executed by a processor, carries out the steps of the method according to any one of claims 1 to 3.
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| CN113037721B (en) * | 2021-02-26 | 2021-10-15 | 珠海市鸿瑞信息技术股份有限公司 | Big data-based network security situation perception early warning system of power monitoring system |
| CN113391139B (en) * | 2021-07-30 | 2022-12-27 | 佛山市顺德区美的电子科技有限公司 | Open-phase detection method and device for three-phase power input line and air conditioner outdoor unit |
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