CN115792735A - Method, device, equipment and medium for online diagnosis of direct current bus capacitor aging - Google Patents
Method, device, equipment and medium for online diagnosis of direct current bus capacitor aging Download PDFInfo
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- CN115792735A CN115792735A CN202211513837.7A CN202211513837A CN115792735A CN 115792735 A CN115792735 A CN 115792735A CN 202211513837 A CN202211513837 A CN 202211513837A CN 115792735 A CN115792735 A CN 115792735A
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Abstract
The disclosure provides an online diagnosis method, device, equipment and storage medium for direct current bus capacitor aging, which can be applied to the technical field of power electronics. The method comprises the following steps: the motor is enabled to intermittently charge the direct current bus capacitor, the increment of the direct current bus voltage of the direct current bus capacitor in preset time and the A-phase current of the motor are obtained, the equivalent capacitance of the direct current bus capacitor is calculated by utilizing the increment of the direct current bus voltage in the preset time and the A-phase current, and the aging condition of the direct current bus capacitor is diagnosed based on the equivalent capacitance of the direct current bus capacitor. The equivalent capacitance estimation precision is high, the maximum error under any working condition is less than 0.5%, the whole motor driving system does not need to be powered off, and the normal operation is not influenced.
Description
Technical Field
The present disclosure relates to the field of power electronics, and in particular, to a method, an apparatus, a device, and a medium for online diagnosis of aging of a dc bus capacitor.
Background
In recent years, the aging state diagnosis of the dc bus capacitor of the motor driving system has attracted much attention. ESR and equivalent capacitance C are the most commonly used indicators for monitoring aging parameters. In general, a dc bus capacitance can be considered to fail when the parameter ESR increases to twice its initial value or the parameter C decreases to 80% of the initial value. Existing diagnostic methods can be divided into off-line methods, quasi-on-line methods and on-line methods.
However, the off-line method needs power failure of the whole motor driving system, and cannot keep a normal operation state for testing, the quasi-on-line method needs specified working conditions, and is generally performed when the power electronic converter operates and the motor stops, so that the diagnosis efficiency is reduced, and the normal operation of the system is affected, and the on-line method has low diagnosis precision or limited parameter estimation accuracy.
Disclosure of Invention
In view of the foregoing, the present disclosure provides methods, apparatuses, devices, media and program products for online diagnosis of aging of a dc bus capacitor.
According to a first aspect of the present disclosure, there is provided an online diagnosis method for dc bus capacitor aging, applied to a three-phase motor driving system, the three-phase motor driving system including a rectifier and a motor driving system, the motor driving system including a dc bus capacitor and a three-phase inverter, the motor driving system being connected to a motor, the method including:
intermittently charging the direct current bus capacitor by the motor to obtain the increment of the direct current bus voltage of the direct current bus capacitor in preset time and the phase A current of the motor;
calculating the equivalent capacitance of the direct current bus capacitor by using the increment of the direct current bus voltage in the preset time and the phase A current;
and diagnosing the aging condition of the direct current bus capacitor based on the equivalent capacitance of the direct current bus capacitor.
In an embodiment of the present disclosure, the intermittently charging the dc bus capacitor with the motor to obtain an increment of the dc bus voltage of the dc bus capacitor within a preset time and an a-phase current of the motor includes:
intermittently charging the DC bus capacitor with the motor;
controlling all switches of the three-phase inverter to be in a closed state, and acquiring the phase A current of the motor;
under the condition that the phase-A current is 0, repeatedly executing preset operation until the direct-current bus current of the direct-current bus capacitor is 0, wherein the preset operation comprises first operation and second operation, the first operation is to control any switch in the three-phase inverter to be in a conducting state within a first preset time period, and the second operation is to control all switches of the three-phase inverter to be in a closed state within a second preset time period;
stopping the motor from intermittently charging the direct current bus capacitor;
in the intermittent charging process, the phase A current and the direct current bus voltage are collected so as to calculate the increment of the direct current bus voltage of the direct current bus capacitor in a preset time and the phase A current when the preset operation is executed.
In an embodiment of the disclosure, before controlling all switches of the three-phase inverter to be in the off state, the method includes:
detecting whether the direct current bus voltage of the direct current bus capacitor reaches a peak value;
and under the condition that the voltage of the direct current bus reaches a peak value, after waiting for a third preset time, executing the operation of controlling all switches of the three-phase inverter to be in a closed state.
In an embodiment of the present disclosure, the method further includes:
acquiring the repeated execution times N of the preset operation, the first preset time t1 and the second preset time t2;
obtaining the preset time T according to the repeated execution times N, the first preset time T1 and the second preset time T2;
wherein T = N (T1 + T2).
In an embodiment of the present disclosure, the calculating, by using the increment of the dc bus voltage in the preset time and the a-phase current, the equivalent capacitance of the dc bus capacitance includes:
obtaining the increment delta V of the direct current bus voltage in the preset time T dc Repeatedly executing the times N, and executing the time value t corresponding to the first operation for the q times 1(q) Executing the time value t corresponding to the second operation for the q times 2(q) And, the A-phase current i when the preset operation is performed for the q-th time a ，0≤q≤N；
Making the equivalent capacitance of the direct current bus capacitor be C, then:
in an embodiment of the present disclosure, diagnosing an aging condition of the dc bus capacitor based on an equivalent capacitance of the dc bus capacitor includes:
obtaining the equivalent capacitance C of the DC bus capacitor in a healthy state 0 ；
Calculating the equivalent capacitance of the direct current bus capacitor as C and the equivalent capacitance C of the direct current bus capacitor in a healthy state 0 The ratio of (A) to (B);
and diagnosing the aging condition of the direct current bus capacitor according to the ratio.
In an embodiment of the present disclosure, the diagnosing the aging condition of the dc bus capacitor according to the ratio includes:
and sending fault early warning prompt information of the direct current bus capacitor under the condition that the ratio is smaller than a preset threshold value.
A second aspect of the present disclosure provides an online diagnosis apparatus for dc bus capacitor aging, including:
the ageing online diagnostic device of direct current bus capacitor is applied to three-phase motor drive system, three-phase motor drive system includes rectifier and motor drive system, motor drive system includes direct current bus capacitor and three-phase inverter, motor drive system connects the motor, the device includes:
the intermittent charging module is used for enabling the motor to intermittently charge the direct current bus capacitor to obtain the increment of the direct current bus voltage of the direct current bus capacitor in a preset time and the phase A current of the motor;
the calculation module is used for calculating the equivalent capacitance of the direct current bus capacitor by utilizing the increment of the direct current bus voltage in the preset time and the phase A current;
and the diagnosis module is used for diagnosing the aging condition of the direct current bus capacitor based on the equivalent capacitance of the direct current bus capacitor.
In an embodiment of the present disclosure, the intermittent charging module is specifically configured to:
intermittently charging the direct current bus capacitor by the motor;
controlling all switches of the three-phase inverter to be in a closed state, and acquiring the phase A current of the motor;
under the condition that the phase-A current is 0, repeatedly executing preset operation until the direct-current bus current of the direct-current bus capacitor is 0, wherein the preset operation comprises first operation and second operation, the first operation is to control any switch in the three-phase inverter to be in a conducting state within a first preset time period, and the second operation is to control all switches of the three-phase inverter to be in a closed state within a second preset time period;
stopping the motor from intermittently charging the direct current bus capacitor;
in the intermittent charging process, the A-phase current and the DC bus voltage are collected so as to calculate the increment of the DC bus voltage of the DC bus capacitor in preset time and the A-phase current when the preset operation is executed.
In an embodiment of the present disclosure, before controlling all switches of the three-phase inverter to be in an off state, the method includes:
detecting whether the direct current bus voltage of the direct current bus capacitor reaches a peak value;
and under the condition that the voltage of the direct current bus reaches a peak value, after waiting for a third preset time, executing the operation of controlling all switches of the three-phase inverter to be in a closed state.
In an embodiment of the present disclosure, the apparatus further includes:
an obtaining module, configured to obtain the number N of times of repeated execution of the preset operation, the first preset time period t1, and the second preset time period t2;
the preset time calculation module is used for obtaining the preset time T according to the repeated execution times N, the first preset time T1 and the second preset time T2;
where, T = N (T1 + T2).
In an embodiment of the present disclosure, the calculation module includes:
obtaining the increment delta V of the direct current bus voltage in the preset time T dc Repeatedly executing the times N, and executing the time value t corresponding to the first operation for the q times 1(q) Executing the time value t corresponding to the q times of the second operation 2(q) And, the A-phase current i when the preset operation is performed for the q-th time a ，0≤q≤N；
Making the equivalent capacitance of the direct current bus capacitor be C, then:
in an embodiment of the present disclosure, the diagnostic module includes:
obtaining the equivalent capacitance C of the DC bus capacitor in a healthy state 0 ；
Calculating the equivalent capacitance of the direct current bus capacitor as C and the equivalent capacitance C of the direct current bus capacitor under the healthy state 0 The ratio of (A) to (B);
and diagnosing the aging condition of the direct current bus capacitor according to the ratio.
In an embodiment of the present disclosure, the diagnosing the aging condition of the dc bus capacitor according to the ratio includes:
and sending fault early warning prompt information of the direct current bus capacitor under the condition that the ratio is smaller than a preset threshold value.
A third aspect of the present disclosure provides an electronic device, comprising: one or more processors; memory for storing one or more programs, wherein the one or more programs, when executed by the one or more processors, cause the one or more processors to perform the above-described method.
A fourth aspect of the present disclosure also provides a computer-readable storage medium having stored thereon executable instructions that, when executed by a processor, cause the processor to perform the above-described method.
A fifth aspect of the disclosure also provides a computer program product comprising a computer program which, when executed by a processor, implements the above method.
According to the online diagnosis method, device, equipment and medium for direct current bus capacitor aging provided by the present disclosure, an embodiment of the present disclosure provides an online diagnosis method for direct current bus capacitor aging, which is applied to a three-phase motor driving system, the three-phase motor driving system includes a rectifier and a motor driving system, the motor driving system includes a direct current bus capacitor and a three-phase inverter, the motor driving system is connected with a motor, the method includes: the motor is enabled to intermittently charge the direct current bus capacitor, the increment of the direct current bus voltage of the direct current bus capacitor in preset time and the phase A current of the motor are obtained, the equivalent capacitance of the direct current bus capacitor is calculated by utilizing the increment of the direct current bus voltage in the preset time and the phase A current, and the aging condition of the direct current bus capacitor is diagnosed based on the equivalent capacitance of the direct current bus capacitor. On one hand, compared with the existing online method, the method does not need to install other hardware equipment including additional sensors, injection devices and the like, the equivalent capacitance estimation precision is high, and the maximum error under any working condition is less than 0.5%. On the other hand, compared with a quasi-online method and an offline method, the method is implemented online during normal operation, namely, the whole motor driving system works without power failure, and the normal operation is not influenced.
Drawings
The foregoing and other objects, features and advantages of the disclosure will be apparent from the following description of embodiments of the disclosure, taken in conjunction with the accompanying drawings of which:
FIG. 1 schematically illustrates an operating environment of a three-phase motor drive system according to an embodiment of the present disclosure;
FIG. 2 schematically illustrates a schematic diagram of an equivalent circuit corresponding to a DC bus capacitance according to an embodiment of the disclosure;
FIG. 3a schematically illustrates a schematic diagram of one switching pattern for operation of a three-phase inverter according to an embodiment of the disclosure;
FIG. 3b schematically illustrates a schematic diagram of another switch combination state of operation of a three-phase inverter according to an embodiment of the disclosure;
fig. 4a schematically shows the dc bus voltage V in this one switch combination state according to an embodiment of the disclosure dc Phase i of motor A phase a A relationship diagram of (a);
FIG. 4b schematically shows the DC bus current i in this one switch combination state according to an embodiment of the disclosure dc Phase i of motor A phase a A schematic diagram of the relationship of (1);
FIG. 5 schematically illustrates a flow chart of a method for online diagnosis of DC bus capacitance aging according to an embodiment of the present disclosure;
FIG. 6 is a block diagram schematically illustrating an online diagnosis apparatus for DC bus capacitance aging according to an embodiment of the present disclosure; and
fig. 7 schematically illustrates a block diagram of an electronic device suitable for implementing an online diagnosis method of dc bus capacitance aging according to an embodiment of the present disclosure.
Detailed Description
Hereinafter, embodiments of the present disclosure will be described with reference to the accompanying drawings. It should be understood that these descriptions are illustrative only and are not intended to limit the scope of the present disclosure. In the following detailed description, for purposes of explanation, numerous specific details are set forth in order to provide a thorough understanding of the embodiments of the disclosure. It may be evident, however, that one or more embodiments may be practiced without these specific details. Moreover, in the following description, descriptions of well-known structures and techniques are omitted so as to not unnecessarily obscure the concepts of the present disclosure.
The terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the disclosure. The terms "comprises," "comprising," and the like, as used herein, specify the presence of stated features, steps, operations, and/or components, but do not preclude the presence or addition of one or more other features, steps, operations, or components.
All terms (including technical and scientific terms) used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs, unless otherwise defined. It is noted that the terms used herein should be interpreted as having a meaning that is consistent with the context of this specification and should not be interpreted in an idealized or overly formal sense.
Where a convention analogous to "at least one of A, B, and C, etc." is used, in general such a construction is intended in the sense one having skill in the art would understand the convention (e.g., "a system having at least one of A, B, and C" would include but not be limited to systems that have A alone, B alone, C alone, A and B together, A and C together, B and C together, and/or A, B, and C together, etc.).
The power electronic converter is an important component in an industrial motor driving system, and is important to ensure high reliability and high-efficiency operation. In general, a power electronic converter is composed of a power semiconductor device and a dc bus capacitor. The aluminum electrolytic capacitor has the advantages of high volume efficiency, high cost performance and the like, is widely applied to power electronic converters, and is used for buffering instantaneous voltage spikes, eliminating harmonic waves, providing reactive power compensation and reducing direct-current voltage ripples. According to the motor driving system fault statistics, the aging failure of the direct current bus capacitor is a key cause of the complete machine system fault
In the operation process, the direct current bus capacitor always bears the electric stress generated by direct current voltage, harmonic voltage and switching transient voltage and the heat loss generated by direct current and harmonic current, the internal electrolyte solution of the direct current bus capacitor is gradually degraded, the service life of the direct current bus capacitor is greatly reduced, and finally the direct current bus capacitor is aged and fails. During the evaporation of the electrolyte and the deterioration of the oxide layer of the electrolytic capacitor, the Equivalent Series Resistance (ESR) increases and the equivalent series capacitance (C) decreases, resulting in a drop in the dc-side bus voltage of the motor drive system, and in severe cases, the entire system will be forced to shut down. Therefore, the online aging state diagnosis is provided for the direct current bus capacitor of the motor driving system, and the online aging state diagnosis method has important significance for preventive maintenance of the motor driving system.
Existing diagnostic methods can be divided into off-line methods, quasi-on-line methods and on-line methods.
The off-line method, which typically measures ESR and C of the dc bus capacitance directly, is simple and inexpensive, but requires disassembly of the system or modification of the circuit. In addition, signal injection or additional equipment is required to extract ESR and C in an offline state. Generally, the off-line method has high diagnosis precision, but needs power failure of the whole system and cannot keep a normal operation state for testing.
The quasi-on-line method is to perform the test under specific operating conditions, such as start-up phase or shut-down state. Compared with the off-line methods, the methods can be conveniently realized without disassembling the motor driving system. When the motor stops, the voltage and the current of the power electronic converter in a special switching mode are used for calculating a transfer function, and estimation of equivalent electric parameters of the direct current bus capacitor is completed. This active switching state adjustment is performed when the motor is stopped, reducing diagnostic efficiency and affecting the normal operation of the system. In addition, the duration of the ringing of the transfer function depends on variable system parameters, and sampling accuracy cannot be guaranteed.
The on-line process is carried out under fully normal operating conditions of the motor. In the prior art, for example, an alternating-current voltage component is injected into a direct-current bus, and an active power online estimation parameter C in a direct-current bus capacitor is calculated. This approach assumes that the motor drive system operates under "constant dc voltage and phase current" conditions, which deviate from the actual operating conditions, resulting in poor diagnostic accuracy. The prior art, for example, uses ripple voltage and ripple current of a direct current bus, and calculates average capacitance power by multiplying current and voltage, and estimates a parameter ESR on line, but the accuracy of parameter estimation based on a sensorless is generally limited. The prior art, again for example based on active switching state modification converter control strategies, uses short circuit current and responsive step voltage to achieve online estimation of the parameter ESR, but its diagnostic approach based on additional injection means adds cost and introduces other reliability problems. In addition, the aging state of the direct current bus capacitor is diagnosed online through low-frequency current injection, however, the current injection needs a controllable grid side converter, and an invasive temperature measuring device is introduced into the scheme, so that the method is not feasible in practical application.
The embodiment of the disclosure provides an online diagnosis method for aging of a direct current bus capacitor, which is applied to a three-phase motor driving system, wherein the three-phase motor driving system comprises a rectifier and a motor driving system, the motor driving system comprises the direct current bus capacitor and a three-phase inverter, the motor driving system is connected with a motor, and the method comprises the following steps: the motor is enabled to intermittently charge the direct current bus capacitor, increment of direct current bus voltage of the direct current bus capacitor within preset time and phase A current of the motor are obtained, the equivalent capacitor of the direct current bus capacitor is calculated by utilizing the increment of the direct current bus voltage within the preset time and the phase A current, and the aging condition of the direct current bus capacitor is diagnosed on the basis of the equivalent capacitor of the direct current bus capacitor. On one hand, compared with the existing online method, the method does not need to install other hardware equipment including additional sensors, injection devices and the like, the equivalent capacitance estimation precision is high, and the maximum error under any working condition is less than 0.5%. On the other hand, compared with a quasi-online method and an offline method, the method is implemented online during normal operation, namely the whole motor driving system does not work without power cut, and normal operation is not influenced.
Fig. 1 schematically illustrates an operating environment schematic of a three-phase motor drive system according to an embodiment of the present disclosure. As shown in fig. 1, the power grid is regarded as an ac power source, and is connected to the three-phase motor driving system via the rectifier, and then connected to the motor, the three-phase motor driving system includes the rectifier and the motor driving system, and the motor driving system includes the dc bus capacitor and the three-phase inverter. The DC bus voltage across the DC bus capacitor is denoted as V dc The DC bus current is denoted as i dc 。
Optionally, in the embodiment of the present disclosure, the three-phase inverter is illustrated by taking a three-phase inverter based on a fully-controlled power electronic switching device (IGBT) as an example.
Fig. 2 schematically shows a schematic diagram of an equivalent circuit corresponding to a dc bus capacitor according to an embodiment of the disclosure. As shown in fig. 2, the dc bus capacitor of the embodiment of the disclosure includes an equivalent resistor ESR and an equivalent capacitor C connected in series. The aging state of the direct current bus capacitor is diagnosed by estimating the equivalent capacitor C.
Fig. 3a schematically illustrates a schematic diagram of one switching combination state of operation of a three-phase inverter according to an embodiment of the disclosure. As shown in fig. 3a, the one switching combination state is a state in which all the switches in the three-phase inverter are closed, and is referred to as switching combination state 1 (000/000). In FIG. 3a, six IGBTs of the upper and lower arms of the three-phase inverter in switch combination state 1 are fully off, and i dc ＝i a ，i a The current is the A-phase current flowing into the motor, and the direct current bus capacitor is reversely charged by the motor in the working mode of the three-phase inverter in the switch combination state 1.
Fig. 3b schematically illustrates a schematic diagram of another switching pattern for operation of a three-phase inverter according to an embodiment of the disclosure. As shown in FIG. 3b, the other switch combination state is that any one switch in the three-phase inverter is in a conducting state, the other switches are in a closed state, which is denoted as switch combination state 2 (100/000), and i dc ＝0。
It can be understood that, in fig. 3b, the example that the upper bridge arm a phase IGBT of the three-phase inverter is turned on and the other five IGBTs are turned off is taken as an example to illustrate, and a person skilled in the art may also turn on any other IGBT to implement the present invention in real time, which is not limited in this disclosure.
Fig. 4a schematically shows the dc bus voltage V in this one switch combination state according to an embodiment of the disclosure dc With phase I of motor A a Schematic diagram of the relationship of (1). Fig. 4b schematically shows the dc bus current i in this one switch combination state according to an embodiment of the disclosure dc Phase i of motor A phase a Schematic diagram of the relationship of (1).
The method for online diagnosis of aging of the dc bus capacitor of the disclosed embodiment will be described in detail with fig. 5 based on the scenarios described in fig. 1 to 4 b.
Fig. 5 schematically illustrates a flow chart of a method for online diagnosis of dc bus capacitance aging according to an embodiment of the present disclosure.
As shown in fig. 5, the online diagnosis method for the aging of the dc bus capacitor of this embodiment includes operations S510 to S530.
In operation S510, the motor is intermittently charged to the dc bus capacitor, so as to obtain an increment of the dc bus voltage of the dc bus capacitor within a preset time and a phase a current of the motor.
In operation S520, an equivalent capacitance of the dc bus capacitance is calculated using the a-phase current and an increment of the dc bus voltage within the preset time.
In operation S530, an aging condition of the dc bus capacitor is diagnosed based on the equivalent capacitance of the dc bus capacitor.
In an embodiment of the present disclosure, in operation S510, intermittently charging the dc bus capacitor with the motor, and obtaining an increment of the dc bus voltage of the dc bus capacitor in a preset time and an a-phase current of the motor includes: intermittently charging the direct current bus capacitor by the motor; all switches of the three-phase inverter are controlled to be in a closed state (as shown in figure 3 a), and the A-phase current i of the motor is acquired a (ii) a At the A phase current i a If the current is 0, repeatedly executing a preset operation until the direct-current bus current of the direct-current bus capacitor is 0, where the preset operation includes a first operation and a second operation, the first operation is to control any switch in the three-phase inverter to be in a conducting state within a first preset time period t1 (as shown in a switch combination state 2 in fig. 3 b), and the second operation is to control all switches of the three-phase inverter to be in a closed state within a second preset time period t2 (as shown in a switch combination state 1 in fig. 3 a); and stopping intermittently charging the direct current bus capacitor by the motor.
In the intermittent charging process, the A-phase current and the DC bus voltage are collected so as to calculate the increment of the DC bus voltage of the DC bus capacitor in a preset time and the A-phase current when the preset operation is executed.
The motor is caused to intermittently charge the dc bus capacitor, that is, the dc bus capacitor is reversely charged by the motor, and the reverse charging can be realized by using the switch combination state 1 shown in fig. 3 a. In the reverse charging switch combination state 1 (000/000), the DC bus voltage of the DC bus capacitor is guaranteed to be equal to the A-phase current flowing into the motor, i.e. i dc ＝i a Therefore, the extra current sensor is prevented from being arranged on the direct current bus capacitor, and the phase current sensor of the system is directly utilized.
In an embodiment of the present disclosure, before controlling all switches of the three-phase inverter to be in the off state, the method includes: detecting the DC bus voltage V of the DC bus capacitor dc Whether a peak is reached; at the DC bus voltage V dc And in the case of reaching the peak value, after waiting for a third preset time period t0, executing the operation of controlling all the switches of the three-phase inverter to be in the closed state.
In an embodiment of the present disclosure, the preset time is a total duration of repeatedly executing the preset operation, and the method for calculating the preset time includes: acquiring the repeated execution times N, the first preset time T1 and the second preset time T2 of the preset operation, and acquiring the preset time T according to the repeated execution times N, the first preset time T1 and the second preset time T2, wherein T = N (T1 + T2).
It can be understood that the first preset time period t1, the second preset time period t2 and the third preset time period t0 are all microsecond level, specific values are not limited, and those skilled in the art can set the values as needed.
In an embodiment of the present disclosure, in operation S520, calculating an equivalent capacitance of the dc bus capacitance by using the increment of the dc bus voltage in the preset time and the a-phase current includes: obtaining the increment delta V of the direct current bus voltage in the preset time T dc Repeatedly executing the times N, and executing the time value t corresponding to the first operation for the q times 1(q) Executing the time value t corresponding to the second operation for the q times 2(q) And, the A-phase current i when the preset operation is performed for the q-th time a Let us orderThe equivalent capacitance of the direct current bus capacitor is C, and q is more than or equal to 0 and less than or equal to N. Then:
in an embodiment of the present disclosure, the diagnosing, in operation S530, the aging of the dc bus capacitor based on the equivalent capacitance of the dc bus capacitor includes: obtaining the equivalent capacitance C of the DC bus capacitor in a healthy state 0 (ii) a Calculating the equivalent capacitance of the DC bus capacitor as C and the equivalent capacitance C of the DC bus capacitor under the healthy state 0 The ratio of (A) to (B); and diagnosing the aging condition of the direct current bus capacitor according to the ratio.
In an embodiment of the present disclosure, the diagnosing the aging condition of the dc bus capacitor according to the ratio includes: and sending out fault early warning prompt information of the direct current bus capacitor under the condition that the ratio is smaller than a preset threshold value. The threshold value is not specifically limited, for example, when the ratio is less than 0.9, the fault early warning prompt information of the direct current bus capacitor is sent out
In an example, the aging condition of the dc bus capacitor may be further divided into a plurality of levels, for example, a first level (serious), a second level (medium), and a third level (light), where the aging condition of the dc bus capacitor is the first level in a first range of the ratio, the aging condition of the dc bus capacitor is the second level in a second range of the ratio, and the aging condition of the dc bus capacitor is the third level in a third range of the ratio. For example, the first range is not less than 0.9, the second range is less than 0.9 and not less than 0.6, and the third range is less than 0.6.
It is understood that the above is only one illustrative example, and that other variations can be made by those skilled in the art.
Optionally, after the aging condition of the dc bus capacitor is diagnosed to meet the standard, the online diagnosis method for aging of the dc bus capacitor provided by the present disclosure may be implemented again after waiting for a specified time, and the aging condition of the dc bus capacitor may be detected in time.
In a practical application example, the real value C of the DC bus capacitor r The yield was 1000.5uF. The running condition of the three-phase motor driving system is 100% of rated speed and 20% of rated load. According to the online diagnosis method for the aging of the direct current bus capacitor, the equivalent capacitance C of the direct current bus capacitor is calculated to be 1001.2uF and the true value C r Compared with the error of 0.7uF, the error is 0.07 percent, and the high-precision online diagnosis of the direct-current bus capacitor of the motor driving system is realized.
Based on the online diagnosis method for the direct current bus capacitor aging, the disclosure also provides an online diagnosis device for the direct current bus capacitor aging. The apparatus will be described in detail below with reference to fig. 6.
Fig. 6 schematically shows a block diagram of a structure of an online diagnosis device for aging of a dc bus capacitor according to an embodiment of the present disclosure.
As shown in fig. 6, the online diagnosis device 600 for dc bus capacitance aging of this embodiment includes an intermittent charging module 610, a calculation module 620, and a diagnosis module 630.
The intermittent charging module 610 is configured to intermittently charge the dc bus capacitor with the motor, so as to obtain an increment of the dc bus voltage of the dc bus capacitor within a preset time and an a-phase current of the motor. In an embodiment, the intermittent charging module 610 may be configured to perform the operation S510 described above, which is not described herein again.
The calculating module 620 is configured to calculate an equivalent capacitance of the dc bus capacitance by using the increment of the dc bus voltage in the preset time and the a-phase current. In an embodiment, the calculating module 620 may be configured to perform the operation S520 described above, which is not described herein again.
The diagnosis module 630 is configured to diagnose the aging condition of the dc bus capacitor based on the equivalent capacitance of the dc bus capacitor. In an embodiment, the diagnosis module 630 may be configured to perform the operation S530 described above, which is not described herein again.
In an embodiment of the present disclosure, the intermittent charging module 610 is specifically configured to:
intermittently charging the direct current bus capacitor by the motor;
controlling all switches of the three-phase inverter to be in a closed state, and acquiring the phase A current of the motor;
under the condition that the phase A current is 0, repeatedly executing preset operation until the direct current bus current of the direct current bus capacitor is 0, wherein the preset operation comprises a first operation and a second operation, the first operation is to control any switch in the three-phase inverter to be in a conducting state within a first preset time period, and the second operation is to control all switches of the three-phase inverter to be in a closed state within a second preset time period;
stopping the motor from intermittently charging the direct current bus capacitor;
in the intermittent charging process, the A-phase current and the DC bus voltage are collected so as to calculate the increment of the DC bus voltage of the DC bus capacitor in a preset time and the A-phase current when the preset operation is executed.
In an embodiment of the present disclosure, before controlling all switches of the three-phase inverter to be in an off state, the method includes:
detecting whether the DC bus voltage of the DC bus capacitor reaches a peak value;
and under the condition that the direct current bus voltage reaches the peak value, after waiting for a third preset time period, executing the operation of controlling all switches of the three-phase inverter to be in a closed state.
In an embodiment of the present disclosure, the apparatus further includes:
an obtaining module, configured to obtain the number N of times of repeated execution of the preset operation, the first preset time t1, and the second preset time t2;
the preset time calculation module is used for obtaining the preset time T according to the repeated execution times N, the first preset time T1 and the second preset time T2;
where, T = N (T1 + T2).
In an embodiment of the present disclosure, the calculating module 620 includes:
obtaining the increment delta V of the DC bus voltage in the preset time T dc The execution times N are repeated, and the q-th execution time is executedThe time value t corresponding to the first operation 1(q) Executing the time value t corresponding to the second operation for the q times 2(q) And, the A-phase current i when the preset operation is performed for the q-th time a ；
Let the equivalent capacitance of this direct current bus capacitance be C, then:
in an embodiment of the present disclosure, the diagnosis module 630 includes:
obtaining the equivalent capacitance C of the DC bus capacitor in a healthy state 0 ；
Calculating the equivalent capacitance of the DC bus capacitor as C and the equivalent capacitance C of the DC bus capacitor under the healthy state 0 The ratio of (A) to (B);
and diagnosing the aging condition of the direct current bus capacitor according to the ratio.
In an embodiment of the present disclosure, the diagnosing the aging condition of the dc bus capacitor according to the ratio includes:
and sending out fault early warning prompt information of the direct current bus capacitor under the condition that the ratio is smaller than a preset threshold value.
According to an embodiment of the present disclosure, any plurality of the intermittent charging module 610, the calculation module 620, and the diagnosis module 630 may be combined into one module to be implemented, or any one of them may be split into a plurality of modules. Alternatively, at least part of the functionality of one or more of these modules may be combined with at least part of the functionality of other modules and implemented in one module. According to an embodiment of the present disclosure, at least one of the intermittent charging module 610, the calculation module 620 and the diagnosis module 630 may be implemented at least partially as a hardware circuit, such as a Field Programmable Gate Array (FPGA), a Programmable Logic Array (PLA), a system on a chip, a system on a substrate, a system on a package, an Application Specific Integrated Circuit (ASIC), or may be implemented in hardware or firmware in any other reasonable manner of integrating or packaging a circuit, or in any one of or a suitable combination of software, hardware and firmware. Alternatively, at least one of the intermittent charging module 610, the calculation module 620 and the diagnostic module 630 may be implemented at least in part as a computer program module that, when executed, may perform a corresponding function.
Fig. 7 schematically illustrates a block diagram of an electronic device suitable for implementing an online diagnosis method of dc bus capacitance aging according to an embodiment of the present disclosure.
As shown in fig. 7, an electronic device 700 according to an embodiment of the present disclosure includes a processor 701, which can perform various appropriate actions and processes according to a program stored in a Read Only Memory (ROM) 702 or a program loaded from a storage section 708 into a Random Access Memory (RAM) 703. The processor 701 may include, for example, a general purpose microprocessor (e.g., a CPU), an instruction set processor and/or associated chipset, and/or a special purpose microprocessor (e.g., an Application Specific Integrated Circuit (ASIC)), among others. The processor 701 may also include on-board memory for caching purposes. The processor 701 may comprise a single processing unit or a plurality of processing units for performing the different actions of the method flows according to embodiments of the present disclosure.
In the RAM 703, various programs and data necessary for the operation of the electronic apparatus 700 are stored. The processor 701, the ROM 702, and the RAM 703 are connected to each other by a bus 704. The processor 701 performs various operations of the method flows according to the embodiments of the present disclosure by executing programs in the ROM 702 and/or the RAM 703. Note that the program may also be stored in one or more memories other than the ROM 702 and the RAM 703. The processor 701 may also perform various operations of method flows according to embodiments of the present disclosure by executing programs stored in the one or more memories.
The present disclosure also provides a computer-readable storage medium, which may be contained in the apparatus/device/system described in the above embodiments; or may exist separately and not be assembled into the device/apparatus/system. The computer-readable storage medium carries one or more programs which, when executed, implement a method according to an embodiment of the disclosure.
According to embodiments of the present disclosure, the computer-readable storage medium may be a non-volatile computer-readable storage medium, which may include, for example but is not limited to: a portable computer diskette, a hard disk, a Random Access Memory (RAM), a read-only memory (ROM), an erasable programmable read-only memory (EPROM or flash memory), a portable compact disc read-only memory (CD-ROM), an optical storage device, a magnetic storage device, or any suitable combination of the foregoing. In the present disclosure, a computer readable storage medium may be any tangible medium that can contain, or store a program for use by or in connection with an instruction execution system, apparatus, or device. For example, according to an embodiment of the present disclosure, a computer-readable storage medium may include the above-described ROM 702 and/or RAM 703 and/or one or more memories other than the ROM 702 and RAM 703.
Embodiments of the present disclosure also include a computer program product comprising a computer program containing program code for performing the method illustrated in the flow chart. The program code is for causing a computer system to carry out the method according to the embodiments of the disclosure, when the computer program product is run on the computer system.
The computer program performs the above-described functions defined in the system/apparatus of the embodiments of the present disclosure when executed by the processor 701. The systems, apparatuses, modules, units, etc. described above may be implemented by computer program modules according to embodiments of the present disclosure.
In one embodiment, the computer program may be hosted on a tangible storage medium such as an optical storage device, a magnetic storage device, or the like. In another embodiment, the computer program may also be transmitted in the form of a signal on a network medium, distributed, downloaded and installed via the communication section 709, and/or installed from the removable medium 711. The computer program containing program code may be transmitted using any suitable network medium, including but not limited to: wireless, wired, etc., or any suitable combination of the foregoing.
In such an embodiment, the computer program may be downloaded and installed from a network through the communication section 709, and/or installed from the removable medium 711. The computer program, when executed by the processor 701, performs the above-described functions defined in the system of the embodiment of the present disclosure. The systems, devices, apparatuses, modules, units, etc. described above may be implemented by computer program modules according to embodiments of the present disclosure.
In accordance with embodiments of the present disclosure, program code for executing computer programs provided by embodiments of the present disclosure may be written in any combination of one or more programming languages, and in particular, these computer programs may be implemented using high level procedural and/or object oriented programming languages, and/or assembly/machine languages. The programming language includes, but is not limited to, programming languages such as Java, C + +, python, the "C" language, or the like. The program code may execute entirely on the user computing device, partly on the user device, partly on a remote computing device, or entirely on the remote computing device or server. In the case of a remote computing device, the remote computing device may be connected to the user computing device through any kind of network, including a Local Area Network (LAN) or a Wide Area Network (WAN), or may be connected to an external computing device (e.g., through the internet using an internet service provider).
The flowchart and block diagrams in the figures illustrate the architecture, functionality, and operation of possible implementations of systems, methods and computer program products according to various embodiments of the present disclosure. In this regard, each block in the flowchart or block diagrams may represent a module, segment, or portion of code, which comprises one or more executable instructions for implementing the specified logical function(s). It should also be noted that, in some alternative implementations, the functions noted in the block may occur out of the order noted in the figures. For example, two blocks shown in succession may, in fact, be executed substantially concurrently, or the blocks may sometimes be executed in the reverse order, depending upon the functionality involved. It will also be noted that each block of the block diagrams or flowchart illustration, and combinations of blocks in the block diagrams or flowchart illustration, can be implemented by special purpose hardware-based systems which perform the specified functions or acts, or combinations of special purpose hardware and computer instructions.
Those skilled in the art will appreciate that various combinations and/or combinations of features recited in the various embodiments and/or claims of the present disclosure can be made, even if such combinations or combinations are not expressly recited in the present disclosure. In particular, various combinations and/or combinations of the features recited in the various embodiments of the present disclosure and/or the claims may be made without departing from the spirit and teachings of the present disclosure. All such combinations and/or associations are within the scope of the present disclosure.
The embodiments of the present disclosure are described above. However, these examples are for illustrative purposes only and are not intended to limit the scope of the present disclosure. Although the embodiments are described separately above, this does not mean that the measures in the embodiments cannot be used in advantageous combination. The scope of the disclosure is defined by the appended claims and equivalents thereof. Various alternatives and modifications can be devised by those skilled in the art without departing from the scope of the present disclosure, and such alternatives and modifications are intended to be within the scope of the present disclosure.
Claims (10)
1. An online diagnosis method for aging of a direct current bus capacitor is applied to a three-phase motor driving system, the three-phase motor driving system comprises a rectifier and a motor driving system, the motor driving system comprises the direct current bus capacitor and a three-phase inverter, the motor driving system is connected with a motor, and the method comprises the following steps:
intermittently charging the direct current bus capacitor by the motor to obtain the increment of the direct current bus voltage of the direct current bus capacitor in preset time and the phase A current of the motor;
calculating the equivalent capacitance of the direct current bus capacitor by using the increment of the direct current bus voltage in the preset time and the phase A current;
and diagnosing the aging condition of the direct current bus capacitor based on the equivalent capacitance of the direct current bus capacitor.
2. The method for online diagnosis of aging of a dc bus capacitor as claimed in claim 1, wherein the intermittently charging the dc bus capacitor by the motor to obtain the increment of the dc bus voltage of the dc bus capacitor within a preset time and the a-phase current of the motor includes:
intermittently charging the DC bus capacitor with the motor;
controlling all switches of the three-phase inverter to be in a closed state, and acquiring the phase A current of the motor;
under the condition that the phase-A current is 0, repeatedly executing preset operation until the direct-current bus current of the direct-current bus capacitor is 0, wherein the preset operation comprises first operation and second operation, the first operation is to control any switch in the three-phase inverter to be in a conducting state within a first preset time period, and the second operation is to control all switches of the three-phase inverter to be in a closed state within a second preset time period;
stopping the motor from intermittently charging the direct current bus capacitor;
in the intermittent charging process, the phase A current and the direct current bus voltage are collected so as to calculate the increment of the direct current bus voltage of the direct current bus capacitor in a preset time and the phase A current when the preset operation is executed.
3. The method of claim 2, wherein before controlling all switches of the three-phase inverter to be in an off state, the method comprises:
detecting whether the direct current bus voltage of the direct current bus capacitor reaches a peak value;
and under the condition that the voltage of the direct current bus reaches a peak value, after waiting for a third preset time, executing the operation of controlling all switches of the three-phase inverter to be in a closed state.
4. The method for online diagnosis of aging of a dc bus capacitor of claim 2 or 3, the method further comprising:
acquiring the repeated execution times N of the preset operation, the first preset time t1 and the second preset time t2;
obtaining the preset time T according to the repeated execution times N, the first preset time T1 and the second preset time T2;
where, T = N (T1 + T2).
5. The method for online diagnosis of aging of a dc bus capacitor of claim 4, wherein the calculating the equivalent capacitance of the dc bus capacitor by using the increment of the dc bus voltage in the preset time and the a-phase current comprises:
obtaining the increment delta V of the direct current bus voltage in the preset time T dc Repeatedly executing the times N, and executing the time value t corresponding to the first operation for the q times 1(q) Executing the time value t corresponding to the q times of the second operation 2(q) And, the A-phase current i when the preset operation is performed for the q-th time a ，0≤q≤N；
Making the equivalent capacitance of the direct current bus capacitor be C, then:
6. the method for online diagnosis of aging of a dc bus capacitor of claim 1, wherein the diagnosing the aging condition of the dc bus capacitor based on the equivalent capacitance of the dc bus capacitor comprises:
obtaining the equivalent capacitance C of the DC bus capacitor in a healthy state 0 ；
Calculating the equivalent capacitance of the direct current bus capacitor as C and the equivalent capacitance C of the direct current bus capacitor in a healthy state 0 The ratio of (A) to (B);
and diagnosing the aging condition of the direct current bus capacitor according to the ratio.
7. The online diagnostic method of dc bus capacitance aging of claim 1, the intermittently charging the motor to the dc bus capacitance comprising:
and enabling all switches of the three-phase inverter to be in a closed state, wherein the direct-current bus voltage of the direct-current bus capacitor is equal to the phase A current.
8. The utility model provides an ageing online diagnostic device of direct current busbar electric capacity, is applied to three-phase motor drive system, three-phase motor drive system includes rectifier and motor drive system, motor drive system includes direct current busbar electric capacity and three-phase inverter, motor drive system connects the motor, the device includes:
the intermittent charging module is used for enabling the motor to intermittently charge the direct current bus capacitor to obtain the increment of the direct current bus voltage of the direct current bus capacitor in a preset time and the phase A current of the motor;
the calculation module is used for calculating the equivalent capacitance of the direct current bus capacitor by utilizing the increment of the direct current bus voltage in the preset time and the phase A current;
and the diagnosis module is used for diagnosing the aging condition of the direct current bus capacitor based on the equivalent capacitance of the direct current bus capacitor.
9. An electronic device, comprising:
one or more processors;
a storage device for storing one or more programs,
wherein the one or more programs, when executed by the one or more processors, cause the one or more processors to perform the method of any of claims 1-7.
10. A computer readable storage medium having stored thereon executable instructions which, when executed by a processor, cause the processor to perform the method according to any one of claims 1 to 7.
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