CN114362498A - Control method and device of three-phase PFC circuit, control equipment and storage medium - Google Patents
Control method and device of three-phase PFC circuit, control equipment and storage medium Download PDFInfo
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- CN114362498A CN114362498A CN202111408357.XA CN202111408357A CN114362498A CN 114362498 A CN114362498 A CN 114362498A CN 202111408357 A CN202111408357 A CN 202111408357A CN 114362498 A CN114362498 A CN 114362498A
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Abstract
The invention provides a control method, a control device, control equipment and a storage medium of a three-phase PFC circuit. The method comprises the following steps: detecting whether the three-phase PFC circuit has a fault; and if detecting that one phase of the three-phase PFC circuit fails, controlling the three-phase PFC circuit to work in a limp home mode, and controlling the failed phase of the three-phase PFC circuit to stop working and simultaneously controlling the rest two phases of the three-phase PFC circuit to continue working in the limp home mode. The invention provides a limp home mode, in the limp home mode, when one phase of a three-phase PFC circuit fails, the remaining two phases which do not fail are controlled to continue to work, and the three-phase PFC circuit does not need to continue to work after the failure is repaired, so that the usability of the three-phase PFC circuit can be improved.
Description
Technical Field
The present invention relates to the field of circuit control technologies, and in particular, to a method and an apparatus for controlling a three-phase PFC circuit, a control device, and a storage medium.
Background
A three-phase PFC (Power Factor Correction) circuit may also be referred to as a three-phase AC-DC converter. When the three-phase PFC circuit works in a normal working mode, the three phases of the three-phase PFC circuit are in a normal working state. When a fault of one phase of the three-phase PFC circuit is detected, the three-phase PFC circuit can not work any more, and the three-phase PFC circuit can work only after the fault is repaired, so that the usability of the three-phase PFC circuit is poor.
Disclosure of Invention
The embodiment of the invention provides a control method, a control device, control equipment and a storage medium of a three-phase PFC circuit, and aims to solve the problem of poor usability of the three-phase PFC circuit.
In a first aspect, an embodiment of the present invention provides a method for controlling a three-phase PFC circuit, including:
detecting whether the three-phase PFC circuit has a fault;
and if detecting that one phase of the three-phase PFC circuit fails, controlling the three-phase PFC circuit to work in a limp home mode, and controlling the failed phase of the three-phase PFC circuit to stop working and simultaneously controlling the rest two phases of the three-phase PFC circuit to continue working in the limp home mode.
In one possible implementation, in the limp home mode, controlling the failed phase of the three-phase PFC circuit to stop operating while controlling the remaining two phases of the three-phase PFC circuit to continue operating includes:
if the three-phase PFC circuit is a three-phase four-wire PFC circuit, stopping sending the driving signal to a corresponding switching tube of the three-phase PFC circuit which has a fault in a limp home mode, and meanwhile continuously sending the driving signal to the remaining two corresponding switching tubes of the three-phase PFC circuit;
if the three-phase PFC circuit is a three-phase three-wire PFC circuit, in a limp home mode, the driving signal is stopped being sent to a corresponding switching tube of the three-phase PFC circuit, and meanwhile, the remaining two phases of the three-phase PFC circuit work in a single-phase PFC mode by adjusting the driving signals of the corresponding switching tubes of the remaining two phases of the three-phase PFC circuit.
In one possible implementation manner, the adjusting of the driving signals of the switching tubes corresponding to the remaining two phases of the three-phase PFC circuit to enable the remaining two phases of the three-phase PFC circuit to operate in the single-phase PFC mode includes:
the current phases of the remaining two phases of the three-phase PFC circuit are adjusted by adjusting the duty ratios of the driving signals of the switching tubes corresponding to the remaining two phases of the three-phase PFC circuit, so that the remaining two phases of the three-phase PFC circuit work in a single-phase PFC mode.
In one possible implementation manner, after detecting whether the three-phase PFC circuit has a fault, the method for controlling the three-phase PFC circuit further includes:
if two phases of the three-phase PFC circuit are detected to be in fault and the three-phase PFC circuit is a three-phase four-wire PFC circuit, the three-phase PFC circuit is controlled to work in a limp mode, the two phases of the three-phase PFC circuit with the fault are controlled to stop working in the limp mode, and meanwhile the rest of the three-phase PFC circuit is controlled to work continuously.
In one possible implementation, in the limp home mode, controlling the failed two phases of the three-phase PFC circuit to cease operation while controlling the remaining one of the successive operations of the three-phase PFC circuit includes:
in the limp home mode, the driving signals are stopped being sent to the two corresponding switch tubes of the three-phase PFC circuit with faults, and meanwhile, the driving signals are continuously sent to the remaining corresponding switch tubes of the three-phase PFC circuit.
In a second aspect, an embodiment of the present invention provides a control device for a three-phase PFC circuit, including:
the detection module is used for detecting whether the three-phase PFC circuit fails;
the first control module is used for controlling the three-phase PFC circuit to work in a limp home mode if one phase of the three-phase PFC circuit is detected to be in fault, and controlling the faulted phase of the three-phase PFC circuit to stop working in the limp home mode and simultaneously controlling the rest two phases of the three-phase PFC circuit to continue working.
In one possible implementation manner, the first control module is specifically configured to:
if the three-phase PFC circuit is a three-phase four-wire PFC circuit, stopping sending the driving signal to a corresponding switching tube of the three-phase PFC circuit which has a fault in a limp home mode, and meanwhile continuously sending the driving signal to the remaining two corresponding switching tubes of the three-phase PFC circuit;
if the three-phase PFC circuit is a three-phase three-wire PFC circuit, in a limp home mode, the driving signal is stopped being sent to a corresponding switching tube of the three-phase PFC circuit, and meanwhile, the remaining two phases of the three-phase PFC circuit work in a single-phase PFC mode by adjusting the driving signals of the corresponding switching tubes of the remaining two phases of the three-phase PFC circuit.
In a third aspect, an embodiment of the present invention provides a control device, which includes a memory, a processor, and a computer program stored in the memory and executable on the processor, and the processor implements the steps of the control method for the three-phase PFC circuit according to the first aspect or any one of the possible implementation manners of the first aspect when executing the computer program.
In a fourth aspect, an embodiment of the present invention provides an uninterruptible power supply, including a three-phase PFC circuit and the control device according to the third aspect;
the three-phase PFC circuit is controlled by a control device.
In a fifth aspect, the present invention provides a computer-readable storage medium, which stores a computer program, and when the computer program is executed by a processor, the computer program implements the steps of the control method for a three-phase PFC circuit according to the first aspect or any one of the possible implementation manners of the first aspect.
The embodiment of the invention provides a control method, a control device and a storage medium of a three-phase PFC circuit, which are used for controlling the three-phase PFC circuit to work in a limp mode by detecting whether the three-phase PFC circuit fails or not, controlling the failed one phase of the three-phase PFC circuit to stop working and controlling the rest two phases of the three-phase PFC circuit to continue working in the limp mode.
Drawings
In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings needed to be used in the embodiments or the prior art descriptions will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings based on these drawings without inventive exercise.
Fig. 1 is a flowchart illustrating an implementation of a control method of a three-phase PFC circuit according to an embodiment of the present invention;
fig. 2 is a schematic structural diagram of a three-phase four-wire PFC circuit according to an embodiment of the present invention;
fig. 3 is a schematic structural diagram of a three-phase three-wire PFC circuit according to an embodiment of the present invention;
fig. 4 is a schematic diagram of current phases of a three-phase three-wire PFC circuit before and after a V-phase fault according to an embodiment of the present invention;
fig. 5 is a schematic diagram of current phases before and after a V-phase and a W-phase failure in a three-phase four-wire PFC circuit according to an embodiment of the present invention;
fig. 6 is a schematic structural diagram of a control device of a three-phase PFC circuit according to an embodiment of the present invention;
fig. 7 is a schematic diagram of a control device provided in an embodiment of the present invention.
Detailed Description
In the following description, for purposes of explanation and not limitation, specific details are set forth, such as particular system structures, techniques, etc. in order to provide a thorough understanding of the embodiments of the invention. It will be apparent, however, to one skilled in the art that the present invention may be practiced in other embodiments that depart from these specific details. In other instances, detailed descriptions of well-known systems, devices, circuits, and methods are omitted so as not to obscure the description of the present invention with unnecessary detail.
In order to make the objects, technical solutions and advantages of the present invention more apparent, the following description is made by way of specific embodiments with reference to the accompanying drawings.
Referring to fig. 1, it shows an implementation flowchart of a control method of a three-phase PFC circuit according to an embodiment of the present invention, where an execution main body of the control method of the three-phase PFC circuit may be a control device, and the control device may be a controller.
Referring to fig. 1, the control method of the three-phase PFC circuit is detailed as follows:
in S101, whether or not the three-phase PFC circuit has failed is detected.
In this embodiment, whether each phase of the three-phase PFC circuit fails or not may be detected by using an existing method, specifically, whether each corresponding switching tube fails or not, and/or whether an input electrical parameter or an output electrical parameter of each phase changes abruptly or the like is detected.
In S102, if it is detected that one of the phases of the three-phase PFC circuit fails, the three-phase PFC circuit is controlled to operate in a limp home mode, and in the limp home mode, the failed phase of the three-phase PFC circuit is controlled to stop operating while the remaining two phases of the three-phase PFC circuit are controlled to continue operating.
In this embodiment, if it is detected that one of the phases of the three-phase PFC circuit fails, that is, any one of the phases of the three-phase PFC circuit fails, the three-phase PFC circuit may be controlled to operate in a limp home mode, and in the limp home mode, the failed phase of the three-phase PFC circuit is controlled to stop operating, and meanwhile, the two remaining phases of the three-phase PFC circuit that do not fail are controlled to continue operating, and power is continuously supplied to the load through the two remaining phases that do not fail.
Illustratively, assuming that a U-phase fault is detected, for example, a breakdown of a switching tube corresponding to U is detected, the three-phase PFC is controlled to operate in a limp home mode, and the U-phase is controlled to stop operating, while the V-phase and the W-phase are controlled to operate sequentially.
The limp home mode refers to an operating mode in which when one or two of the phases of the three-phase PFC circuit fails, the three-phase PFC circuit passes through the remaining two phases that do not fail or a remaining one of the two phases operates sequentially. In limp home mode, the three-phase PFC circuit may continue to operate without stopping operation.
The embodiment of the invention provides a limp mode, wherein in the limp mode, when one phase of a three-phase PFC circuit is detected to be in fault, the three-phase PFC circuit is controlled to work in a limp mode, the failed phase of the three-phase PFC circuit is controlled to stop working, and the rest two phases of the three-phase PFC circuit are controlled to continue working, so that the working mode of the three-phase PFC circuit is controlled.
In some embodiments, the step of controlling the failed one phase of the three-phase PFC circuit to stop operating while controlling the remaining two phases of the three-phase PFC circuit to continue operating in the limp home mode in S102 may include the steps of:
if the three-phase PFC circuit is a three-phase four-wire PFC circuit, stopping sending the driving signal to a corresponding switching tube of the three-phase PFC circuit which has a fault in a limp home mode, and meanwhile continuously sending the driving signal to the remaining two corresponding switching tubes of the three-phase PFC circuit;
if the three-phase PFC circuit is a three-phase three-wire PFC circuit, in a limp home mode, the driving signal is stopped being sent to a corresponding switching tube of the three-phase PFC circuit, and meanwhile, the remaining two phases of the three-phase PFC circuit work in a single-phase PFC mode by adjusting the driving signals of the corresponding switching tubes of the remaining two phases of the three-phase PFC circuit.
The three-phase four-wire PFC circuit is a three-phase PFC circuit with a zero line (N line), and its structure is shown in fig. 2. The three-phase four-wire PFC circuit includes ports U, V, W and N for connection to an input power source, inductors L1, L2 and L3, capacitors C1, C2, C3, C4 and C5, and switching tubes S1, S2, S3, S4, S5 and S6. The two ends of the capacitor C4 are respectively connected with BUS + and NBUS, and the two ends of the capacitor C5 are respectively connected with NBUS and BUS-. The specific connection relationship of the circuit can be seen in fig. 2, and is not described in detail.
Because each phase of the three-phase four-wire PFC circuit can form a loop with a zero line, the three phases are not influenced mutually, any one phase or any two phases can be controlled to stop working, the remaining two phases or the remaining one phase can be controlled to continuously work, and the normal work can be realized without adjusting the phase.
The three-phase PFC circuit needs to continuously send a driving signal to each corresponding switching tube to enable each phase to work. Therefore, when the three-phase PFC circuit is a three-phase four-wire PFC circuit, the phase can be stopped from working only by stopping sending the driving signal to the corresponding switching tube of the three-phase PFC circuit which has a fault, and the remaining two phases can be continuously worked by continuously sending the driving signal to the corresponding switching tubes of the remaining two phases which have not a fault. In the three-phase four-wire PFC circuit, the driving signals sent to the corresponding switch tubes of the remaining two phases which are not in fault and the driving signals sent to the switch tubes when the three phases work together can be kept unchanged without adjustment.
Referring to fig. 2, U corresponds to switching tubes S1 and S2, V corresponds to switching tubes S3 and S4, and W corresponds to switching tubes S5 and S6. When the V-phase failure is detected, the transmission of the driving signals to S3 and S4 is stopped, and the transmission of the driving signals to S1, S2, S5, and S6 is continued.
The above-described continuation of the transmission of the drive signals to the switching tubes corresponding to the remaining two phases of the three-phase PFC circuit does not mean the transmission of the same drive signals to the switching tubes corresponding to the remaining two phases of the three-phase PFC circuit, but means the continuation of the transmission of the drive signals.
The three-phase three-wire PFC circuit is a PFC circuit without a zero wire, and the structure of the three-phase three-wire PFC circuit is shown in fig. 3. The three-phase three-wire PFC circuit includes ports U, V and W for connection with an input power source, inductors L1, L2 and L3, capacitors C1, C2, C3 and C4, and switching tubes S1, S2, S3, S4, S5 and S6. The two ends of the capacitor C4 are respectively connected with BUS + and BUS-. The specific connection relationship of the circuit can be seen in fig. 3, and is not described in detail.
Since the three-phase three-wire PFC has no neutral line, at least two phases are required to form the circuit. That is, the three-phase three-wire PFC can only control one phase to stop working at most, and cannot control two phases to stop working. When two phases of the three-phase three-wire PFC circuit are controlled to stop working, the circuit can not continue to work normally.
In the three-phase three-wire PFC circuit, when a fault of one phase is detected, the failed phase is controlled to stop working, and the rest two phases which are not failed are controlled to continue working, so that the driving of the failed phase is required to be turned off, and the driving signals of the corresponding switch tubes of the rest two phases are required to be adjusted, so that the rest two phases of the three-phase PFC circuit work in a single-phase PFC mode. The single-phase PFC mode refers to a single-phase PFC operation mode, and the driving signal transmitted to each switching tube to be operated in the single-phase PFC operation mode is different from the driving signal transmitted to the switching tube to be operated in the three-phase PFC operation mode, so that the driving signals of the remaining two corresponding switching tubes need to be adjusted.
Referring to fig. 3, it is assumed that the V phase fails, the V phase is controlled to stop working, the U phase and the V phase continue working sequentially, and the three-phase three-wire PFC circuit at this time is equivalent to a single-phase PFC composed of UW and needs to work in a single-phase PFC mode. For example, the U-phase may be regarded as an L-line, and the W-phase may be regarded as an N-line, which corresponds to a single-phase PFC of L-N.
In some embodiments, the adjusting the driving signals of the switching tubes corresponding to the remaining two phases of the three-phase PFC circuit to enable the remaining two phases of the three-phase PFC circuit to operate in the single-phase PFC mode includes:
the current phases of the remaining two phases of the three-phase PFC circuit are adjusted by adjusting the duty ratios of the driving signals of the switching tubes corresponding to the remaining two phases of the three-phase PFC circuit, so that the remaining two phases of the three-phase PFC circuit work in a single-phase PFC mode.
In this embodiment, adjusting the driving signals of the remaining two phases corresponding to the switching tubes means adjusting the duty ratios of the corresponding driving signals, so as to adjust the current phases of the remaining two phases, and enable the remaining two phases of the three-phase PFC circuit to operate in the single-phase PFC mode.
Referring to fig. 4, the left side of fig. 4 shows the current phases of the three phases when the three phases of the three-phase three-wire PFC circuit are all in operation, and the right side of fig. 4 shows the current phase of the single-phase PFC composed of U, W phases with the V-phase being closed, which is changed by 30 degrees compared with the current phase of the original U-phase. The change can be realized by adjusting the duty ratio of the driving signal of the corresponding switching tube, and the change can be specifically adjusted by adopting the existing method and is not repeated.
In some embodiments, after S101, the method for controlling the three-phase PFC circuit further includes:
if two phases of the three-phase PFC circuit are detected to be in fault and the three-phase PFC circuit is a three-phase four-wire PFC circuit, the three-phase PFC circuit is controlled to work in a limp mode, the two phases of the three-phase PFC circuit with the fault are controlled to stop working in the limp mode, and meanwhile the rest of the three-phase PFC circuit is controlled to work continuously.
Since the three-phase four-wire PFC circuit can be operated with only one phase remaining, when it is detected that two phases of the three-phase four-wire PFC circuit have failed, the circuit can be controlled to enter a limp home mode, and in the limp home mode, the failed two phases of the three-phase four-wire PFC circuit are controlled to stop operating while the remaining one, which has not failed, is controlled to operate successively.
In some embodiments, the controlling the two failed phases of the three-phase PFC circuit to cease operation while controlling the remaining one of the three-phase PFC circuits to continue operation in the limp home mode includes:
in the limp home mode, the driving signals are stopped being sent to the two corresponding switch tubes of the three-phase PFC circuit with faults, and meanwhile, the driving signals are continuously sent to the remaining corresponding switch tubes of the three-phase PFC circuit.
According to the foregoing description, any two phases of the three-phase four-wire PFC circuit do not affect each other. Therefore, when a failure of two phases of the three-phase four-wire PFC circuit is detected, the failed two phases are controlled to stop operating in the limp home mode, and the driving of the switching tubes corresponding to the two phases is directly turned off, and the driving of the switching tubes of the remaining one phase, which is not failed, is continuously maintained.
Referring to fig. 5, the left side of fig. 5 shows the current phase of the three phases when the three phases of the three-phase four-wire PFC circuit are all working, the solid arrow on the right side of fig. 5 shows the current phase of the U phase after the three-phase four-wire PFC circuit closes the V and W phases, and since there is a zero line, the V and W phases are closed, the phase of the U-phase current is not affected, and the current flows from U to N.
In a possible implementation manner, if a fault is detected in two phases of the three-phase PFC circuit and the three-phase PFC circuit is a three-phase three-wire PFC circuit, the three-phase PFC circuit is controlled to stop working.
In a possible implementation manner, if a fault occurs in all three phases of the three-phase PFC circuit, the three-phase PFC circuit is controlled to stop working.
When two phases of the three-phase three-wire PFC circuit are in fault or three phases of the three-phase PFC circuit are in fault, the three-phase PFC circuit cannot work and needs to work after the fault is repaired.
In a possible implementation manner, after the detecting that one phase of the three-phase PFC circuit fails, and controlling the three-phase PFC circuit to operate in a limp home mode, and in the limp home mode, controlling the failed phase of the three-phase PFC circuit to stop operating while controlling the remaining two phases of the three-phase PFC circuit to continue operating, the method for controlling the three-phase PFC circuit further includes:
if the fault phase is detected to be recovered to be normal, the working parameters of the three-phase PFC circuit meet a first preset condition, and the working parameters of the three-phase PFC circuit do not meet a second preset condition, controlling the three-phase PFC circuit to still work in a limp mode, controlling one phase of the three-phase PFC circuit to stop working in the limp mode, and simultaneously controlling the rest two phases of the three-phase PFC circuit to continue working; the first preset condition is that the input current of the three-phase PFC circuit is smaller than a first preset current threshold; the second preset condition is that the input current of the three-phase PFC circuit is smaller than a second preset current threshold value, and the second preset current threshold value is smaller than the first preset current threshold value; controlling the one phase which stops working to be any one phase of the three-phase PFC circuit or one phase determined according to a first preset rotation sequence;
if the fault one phase is detected to be recovered to be normal and the working parameters of the three-phase PFC circuit do not meet the first preset condition, controlling the three-phase PFC circuit to work in a normal mode and controlling the three phases of the three-phase PFC circuit to work normally;
if the fault state of one phase is detected, the working parameters of the three-phase PFC circuit meet a second preset condition, and the three-phase PFC circuit is a three-phase four-wire PFC circuit, the three-phase PFC circuit is controlled to still work in a limp home mode, the fault phase of the three-phase PFC circuit is controlled to stop working in the limp home mode, one phase of the remaining two phases of the three-phase PFC circuit, which are not in fault, is controlled to stop working, and the other phase of the three-phase PFC circuit is controlled to continuously work;
if the detected failed phase is recovered to be normal, the working parameters of the three-phase PFC circuit meet a second preset condition, and the three-phase PFC circuit is a three-phase four-wire PFC circuit, controlling the three-phase PFC circuit to still work in a limp mode, controlling two phases of the three-phase PFC circuit to stop working in the limp mode, and simultaneously controlling the rest of the three-phase PFC circuit to work continuously; and controlling the two phases which stop working to be any two phases of the three-phase PFC circuit or two phases of the three-phase PFC circuit which are determined according to a second preset rotation sequence.
In a possible implementation manner, the first preset condition is that the input current of the three-phase PFC circuit is smaller than a first preset current threshold, and a duration that the input current of the three-phase PFC circuit is smaller than the first preset current threshold is longer than a first preset duration.
In a possible implementation manner, the second preset condition is that the input current of the three-phase PFC circuit is smaller than a second preset current threshold, and a duration that the input current of the three-phase PFC circuit is smaller than the second preset current threshold is longer than a second preset duration. At this time, the first preset condition may be that the input current of the three-phase PFC circuit is smaller than a first preset current threshold and not smaller than a second preset current threshold, and a duration of the input current of the three-phase PFC circuit being smaller than the first preset current threshold and not smaller than the second preset current threshold is longer than a first preset duration.
The first preset current threshold and the second preset current threshold may be set according to actual requirements, and are not described herein again. The first preset time period and the second preset time period may be equal or unequal, and the specific time period may be set according to actual requirements, for example, may be 5 seconds, 10 seconds, and the like.
The first preset rotation order may be set according to actual requirements, for example, the first preset rotation order may be U, V, W, or may be U, W, V, and the like, and is not limited herein.
Through first preset in turn order, can control different looks inoperative at every turn to can make each corresponding equipment rest in turn, improve its life-span. For example, assuming that the first preset rotation order is U, V, W, this time U-phase is selected to stop working, the next time V-phase is selected to stop working according to the order, and so on.
The second predetermined rotation order may be the same as or different from the first predetermined rotation order, and is not limited herein.
In this embodiment, if it is detected that the operating parameter of the three-phase PFC circuit satisfies the first preset condition or the second preset condition, it may be determined that the three-phase PFC circuit is in a light load state, and is only in a light load state of different degrees. And the load rate of the three-phase PFC circuit when the working parameters of the three-phase PFC circuit meet the second preset condition is smaller than the load rate of the three-phase PFC circuit when the working parameters of the three-phase PFC circuit meet the first preset condition.
For example, when the working parameters of the three-phase PFC circuit satisfy a first preset condition, the load factor of the three-phase PFC circuit is 50%; and when the working parameters of the three-phase PFC circuit meet a second preset condition, the load rate of the three-phase PFC circuit is 30%.
When the three-phase PFC circuit is in a light-load state, the three-phase PFC circuit can be actively controlled to be in a limping mode, one phase or two phases of the three-phase PFC circuit are controlled to not work, and the purpose of saving energy is achieved.
In this embodiment, after the fault of the three-phase PFC circuit is recovered to normal, one or two phases of the three-phase PFC circuit can still be controlled to stop working under a certain condition, the remaining two phases or the remaining one phase are used to supply power to the load, so that energy can be saved, and the service life of the equipment corresponding to the phase can be prolonged by making the one or two phases not work; in addition, the phases which stop working are selected through the first preset rotation sequence or the second preset rotation sequence, so that each phase can not work in a rotation mode, the service life balance of each corresponding device is ensured, and the availability of the three-phase PFC circuit is improved.
In a possible implementation manner, after the detecting that two phases of the three-phase PFC circuit have failed, the three-phase PFC circuit is a three-phase four-wire PFC circuit, and the controlling the three-phase PFC circuit to operate in a limp home mode, and in the limp home mode, the controlling method of the three-phase PFC circuit includes:
if the three-phase PFC circuit is a three-phase four-wire PFC circuit, and two phases of the three-phase PFC circuit, which are detected to have faults, are recovered to be normal, and working parameters of the three-phase PFC circuit do not meet first preset conditions, controlling the three-phase PFC circuit to work in a normal mode, and controlling three phases of the three-phase PFC circuit to work normally;
if the three-phase PFC circuit is a three-phase four-wire PFC circuit, and two failed phases of the three-phase PFC circuit are detected to be recovered to be normal, and working parameters of the three-phase PFC circuit meet second preset conditions, the three-phase PFC circuit is controlled to still work in a limp mode, two phases of the three-phase PFC circuit are controlled to stop working in the limp mode, and meanwhile the rest of the three-phase PFC circuit is controlled to work continuously; controlling the two phases which stop working to be any two phases of the three-phase PFC circuit or two phases of the three-phase PFC circuit which are determined according to a second preset rotation sequence;
if the three-phase PFC circuit is a three-phase four-wire PFC circuit, and two failed phases of the three-phase PFC circuit are detected to be recovered to be normal, the working parameters of the three-phase PFC circuit meet a first preset condition, and the working parameters of the three-phase PFC circuit do not meet a second preset condition, controlling the three-phase PFC circuit to still work in a limp home mode, and controlling one phase of the three-phase PFC circuit to stop working and controlling the remaining two phases of the three-phase PFC circuit to continue working in the limp home mode; controlling the one phase which stops working to be any one phase of the three-phase PFC circuit or one phase determined according to a first preset rotation sequence;
if the three-phase PFC circuit is a three-phase four-wire PFC circuit, and one of two phases of the three-phase PFC circuit which have faults is detected to be recovered to be normal, the other phase of the three-phase PFC circuit is still in a fault state, and working parameters of the three-phase PFC circuit do not meet second preset conditions, the three-phase PFC circuit is controlled to still work in a limp home mode, one phase of the three-phase PFC circuit which has faults is controlled to stop working in the limp home mode, and meanwhile, two phases which have not faults are controlled to continue to work;
if the three-phase PFC circuit is a three-phase four-wire PFC circuit, and it is detected that one of two failed phases of the three-phase PFC circuit is recovered to be normal, the other phase is still in a failure state, and the working parameters of the three-phase PFC circuit meet second preset conditions, the three-phase PFC circuit is controlled to still work in a limp home mode, one failed phase of the three-phase PFC circuit is controlled to stop working in the limp home mode, one failed phase of the remaining two failed phases of the three-phase PFC circuit is controlled to stop working, and the other two phases are controlled to continuously work in succession.
It should be understood that, the sequence numbers of the steps in the foregoing embodiments do not imply an execution sequence, and the execution sequence of each process should be determined by its function and inherent logic, and should not constitute any limitation to the implementation process of the embodiments of the present invention.
The following are embodiments of the apparatus of the invention, reference being made to the corresponding method embodiments described above for details which are not described in detail therein.
Fig. 6 is a schematic structural diagram of a control device of a three-phase PFC circuit according to an embodiment of the present invention, and for convenience of description, only the portions related to the embodiment of the present invention are shown, and detailed descriptions are as follows:
as shown in fig. 6, the control device 100 of the three-phase PFC circuit includes: a detection module 101 and a first control module 102.
The detection module 101 is configured to detect whether a three-phase PFC circuit fails;
the first control module 102 is configured to, if it is detected that one of the phases of the three-phase PFC circuit fails, control the three-phase PFC circuit to operate in a limp home mode, and, in the limp home mode, control the failed phase of the three-phase PFC circuit to stop operating while controlling the remaining two phases of the three-phase PFC circuit to continue operating.
In one possible implementation, the first control module 102 is specifically configured to:
if the three-phase PFC circuit is a three-phase four-wire PFC circuit, stopping sending the driving signal to a corresponding switching tube of the three-phase PFC circuit which has a fault in a limp home mode, and meanwhile continuously sending the driving signal to the remaining two corresponding switching tubes of the three-phase PFC circuit;
if the three-phase PFC circuit is a three-phase three-wire PFC circuit, in a limp home mode, the driving signal is stopped being sent to a corresponding switching tube of the three-phase PFC circuit, and meanwhile, the remaining two phases of the three-phase PFC circuit work in a single-phase PFC mode by adjusting the driving signals of the corresponding switching tubes of the remaining two phases of the three-phase PFC circuit.
In one possible implementation, the first control module 102 is specifically configured to:
the current phases of the remaining two phases of the three-phase PFC circuit are adjusted by adjusting the duty ratios of the driving signals of the switching tubes corresponding to the remaining two phases of the three-phase PFC circuit, so that the remaining two phases of the three-phase PFC circuit work in a single-phase PFC mode.
In one possible implementation, the control apparatus 100 of the three-phase PFC circuit further includes: and a second control module.
The second control module is used for controlling the three-phase PFC circuit to work in a limp mode if the fact that two phases of the three-phase PFC circuit are in fault is detected and the three-phase PFC circuit is a three-phase four-wire PFC circuit, controlling the two phases of the three-phase PFC circuit with the fault to stop working in the limp mode and simultaneously controlling the rest of the three-phase PFC circuit to work continuously.
In a possible implementation manner, the second control module is specifically configured to:
in the limp home mode, the driving signals are stopped being sent to the two corresponding switch tubes of the three-phase PFC circuit with faults, and meanwhile, the driving signals are continuously sent to the remaining corresponding switch tubes of the three-phase PFC circuit.
Fig. 7 is a schematic diagram of a control device provided in an embodiment of the present invention. As shown in fig. 7, the control apparatus 11 of this embodiment includes: a processor 110, a memory 111 and a computer program 112 stored in said memory 111 and executable on said processor 110. The processor 110, when executing the computer program 112, implements the steps in the control method embodiments of the respective three-phase PFC circuits described above, such as S101 to S102 shown in fig. 1. Alternatively, the processor 110, when executing the computer program 112, implements the functions of each module/unit in the above-mentioned device embodiments, for example, the functions of the modules/units 101 to 102 shown in fig. 6.
Illustratively, the computer program 112 may be partitioned into one or more modules/units that are stored in the memory 111 and executed by the processor 110 to implement the present invention. The one or more modules/units may be a series of computer program instruction segments capable of performing specific functions, which are used to describe the execution process of the computer program 112 in the control device 11. For example, the computer program 112 may be divided into the modules/units 101 to 102 shown in fig. 6.
The control device 11 may be a desktop computer, a notebook, a palm computer, a cloud server, or other computing devices. The control device 11 may include, but is not limited to, a processor 110, a memory 111. It will be appreciated by those skilled in the art that fig. 7 is merely an example of the control device 11, and does not constitute a limitation of the control device 11, and may include more or less components than those shown, or combine certain components, or different components, for example, the control device may also include input-output devices, network access devices, buses, etc.
The Processor 110 may be a Central Processing Unit (CPU), other general purpose Processor, a Digital Signal Processor (DSP), an Application Specific Integrated Circuit (ASIC), a Field Programmable Gate Array (FPGA) or other Programmable logic device, discrete Gate or transistor logic device, discrete hardware component, or the like. A general purpose processor may be a microprocessor or the processor may be any conventional processor or the like.
The memory 111 may be an internal storage unit of the control device 11, such as a hard disk or a memory of the control device 11. The memory 111 may also be an external storage device of the control device 11, such as a plug-in hard disk, a Smart Media Card (SMC), a Secure Digital (SD) Card, a Flash memory Card (Flash Card), and the like, which are provided on the control device 11. Further, the memory 111 may also include both an internal storage unit and an external storage device of the control device 11. The memory 111 is used for storing the computer program and other programs and data required by the control device. The memory 111 may also be used to temporarily store data that has been output or is to be output.
The embodiment also provides an uninterruptible power supply, which comprises a three-phase PFC circuit and the control equipment;
the three-phase PFC circuit is controlled by a control device.
It will be apparent to those skilled in the art that, for convenience and brevity of description, only the above-mentioned division of the functional units and modules is illustrated, and in practical applications, the above-mentioned function distribution may be performed by different functional units and modules according to needs, that is, the internal structure of the apparatus is divided into different functional units or modules to perform all or part of the above-mentioned functions. Each functional unit and module in the embodiments may be integrated in one processing unit, or each unit may exist alone physically, or two or more units are integrated in one unit, and the integrated unit may be implemented in a form of hardware, or in a form of software functional unit. In addition, specific names of the functional units and modules are only for convenience of distinguishing from each other, and are not used for limiting the protection scope of the present application. The specific working processes of the units and modules in the system may refer to the corresponding processes in the foregoing method embodiments, and are not described herein again.
In the above embodiments, the descriptions of the respective embodiments have respective emphasis, and reference may be made to the related descriptions of other embodiments for parts that are not described or illustrated in a certain embodiment.
Those of ordinary skill in the art will appreciate that the various illustrative elements and algorithm steps described in connection with the embodiments disclosed herein may be implemented as electronic hardware or combinations of computer software and electronic hardware. Whether such functionality is implemented as hardware or software depends upon the particular application and design constraints imposed on the implementation. Skilled artisans may implement the described functionality in varying ways for each particular application, but such implementation decisions should not be interpreted as causing a departure from the scope of the present invention.
In the embodiments provided by the present invention, it should be understood that the disclosed apparatus/control device and method may be implemented in other ways. For example, the above-described embodiments of the apparatus/control device are merely illustrative, and for example, the division of the modules or units is only one logical division, and there may be other divisions when actually implemented, for example, a plurality of units or components may be combined or integrated into another system, or some features may be omitted, or not executed. In addition, the shown or discussed mutual coupling or direct coupling or communication connection may be an indirect coupling or communication connection through some interfaces, devices or units, and may be in an electrical, mechanical or other form.
The units described as separate parts may or may not be physically separate, and parts displayed as units may or may not be physical units, may be located in one place, or may be distributed on a plurality of network units. Some or all of the units can be selected according to actual needs to achieve the purpose of the solution of the embodiment.
In addition, functional units in the embodiments of the present invention may be integrated into one processing unit, or each unit may exist alone physically, or two or more units are integrated into one unit. The integrated unit can be realized in a form of hardware, and can also be realized in a form of a software functional unit.
The integrated modules/units, if implemented in the form of software functional units and sold or used as separate products, may be stored in a computer readable storage medium. Based on such understanding, all or part of the flow of the method according to the above embodiments may be implemented by a computer program, which may be stored in a computer readable storage medium, and when the computer program is executed by a processor, the steps of the control method embodiments of the three-phase PFC circuit may be implemented. Wherein the computer program comprises computer program code, which may be in the form of source code, object code, an executable file or some intermediate form, etc. The computer-readable medium may include: any entity or device capable of carrying the computer program code, recording medium, usb disk, removable hard disk, magnetic disk, optical disk, computer Memory, Read-Only Memory (ROM), Random Access Memory (RAM), electrical carrier wave signals, telecommunications signals, software distribution medium, and the like. It should be noted that the computer readable medium may contain other components which may be suitably increased or decreased as required by legislation and patent practice in jurisdictions, for example, in some jurisdictions, computer readable media which may not include electrical carrier signals and telecommunications signals in accordance with legislation and patent practice.
The above-mentioned embodiments are only used for illustrating the technical solutions of the present invention, and not for limiting the same; although the present invention has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; such modifications and substitutions do not substantially depart from the spirit and scope of the embodiments of the present invention, and are intended to be included within the scope of the present invention.
Claims (10)
1. A control method of a three-phase PFC circuit is characterized by comprising the following steps:
detecting whether the three-phase PFC circuit has a fault;
and if one phase of the three-phase PFC circuit is detected to be in fault, controlling the three-phase PFC circuit to work in a limp home mode, and controlling the faulted phase of the three-phase PFC circuit to stop working in the limp home mode, and simultaneously controlling the rest two phases of the three-phase PFC circuit to continue working.
2. The method of claim 1, wherein the controlling the failed phase of the three-phase PFC circuit to stop operating while controlling the remaining two phases of the three-phase PFC circuit to continue operating in the limp home mode comprises:
if the three-phase PFC circuit is a three-phase four-wire PFC circuit, stopping sending a driving signal to a corresponding switching tube of the three-phase PFC circuit which has a fault in the limp home mode, and meanwhile continuously sending the driving signal to the corresponding switching tubes of the remaining two phases of the three-phase PFC circuit;
if the three-phase PFC circuit is a three-phase three-wire PFC circuit, in the limp home mode, the driving signal is stopped being sent to a corresponding switch tube of the three-phase PFC circuit, and meanwhile, the remaining two phases of the three-phase PFC circuit work in a single-phase PFC mode by adjusting the driving signals of the corresponding switch tubes of the remaining two phases of the three-phase PFC circuit.
3. The method as claimed in claim 2, wherein the operating the remaining two phases of the three-phase PFC circuit in a single-phase PFC mode by adjusting the driving signals of the switching tubes corresponding to the remaining two phases of the three-phase PFC circuit comprises:
the current phases of the remaining two phases of the three-phase PFC circuit are adjusted by adjusting the duty ratios of the driving signals of the switching tubes corresponding to the remaining two phases of the three-phase PFC circuit, so that the remaining two phases of the three-phase PFC circuit work in a single-phase PFC mode.
4. The method of controlling a three-phase PFC circuit according to any one of claims 1 to 3, further comprising, after the detecting whether the three-phase PFC circuit is malfunctioning:
and if two phases of the three-phase PFC circuit are detected to be in fault and the three-phase PFC circuit is a three-phase four-wire PFC circuit, controlling the three-phase PFC circuit to work in the limp mode, controlling the two phases of the three-phase PFC circuit with faults to stop working in the limp mode, and simultaneously controlling the rest of the three-phase PFC circuit to work successively.
5. The method of claim 4, wherein the controlling the failed two phases of the three-phase PFC circuit to cease operation while controlling the remaining one of the three-phase PFC circuit to continue operation in the limp home mode comprises:
and in the limp home mode, stopping sending the driving signals to the two corresponding switch tubes of the three-phase PFC circuit with faults, and simultaneously continuing sending the driving signals to the remaining corresponding switch tube of the three-phase PFC circuit.
6. A control apparatus for a three-phase PFC circuit, comprising:
the detection module is used for detecting whether the three-phase PFC circuit has a fault;
the first control module is used for controlling the three-phase PFC circuit to work in a limp home mode if one phase of the three-phase PFC circuit is detected to be in fault, and controlling the faulted phase of the three-phase PFC circuit to stop working and simultaneously controlling the rest two phases of the three-phase PFC circuit to continue working in the limp home mode.
7. The control device of the three-phase PFC circuit of claim 6, wherein the first control module is specifically configured to:
if the three-phase PFC circuit is a three-phase four-wire PFC circuit, stopping sending a driving signal to a corresponding switching tube of the three-phase PFC circuit which has a fault in the limp home mode, and meanwhile continuously sending the driving signal to the corresponding switching tubes of the remaining two phases of the three-phase PFC circuit;
if the three-phase PFC circuit is a three-phase three-wire PFC circuit, in the limp home mode, the driving signal is stopped being sent to a corresponding switch tube of the three-phase PFC circuit, and meanwhile, the remaining two phases of the three-phase PFC circuit work in a single-phase PFC mode by adjusting the driving signals of the corresponding switch tubes of the remaining two phases of the three-phase PFC circuit.
8. A control device comprising a memory, a processor and a computer program stored in the memory and executable on the processor, characterized in that the processor implements the steps of the control method of the three-phase PFC circuit according to any of the preceding claims 1 to 5 when executing the computer program.
9. An uninterruptible power supply comprising a three-phase PFC circuit and the control apparatus of claim 8;
the three-phase PFC circuit is controlled by the control device.
10. A computer-readable storage medium storing a computer program, wherein the computer program, when executed by a processor, implements the steps of the method of controlling a three-phase PFC circuit according to any one of claims 1 to 5 above.
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| CN202111408357.XA CN114362498A (en) | 2021-11-24 | 2021-11-24 | Control method and device of three-phase PFC circuit, control equipment and storage medium |
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| CN202111408357.XA CN114362498A (en) | 2021-11-24 | 2021-11-24 | Control method and device of three-phase PFC circuit, control equipment and storage medium |
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