Rectifier health assessment method, uninterruptible power supply, and computer-readable storage medium
By acquiring and comparing the soft-start duration and electrical energy during rectifier startup, and combining this with the bus voltage change rate, an automatic assessment of the rectifier's health status is achieved. This solves the problem of relying on the experience of maintenance personnel, improves the accuracy of the assessment, and reduces costs.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- SHENZHEN ECOWATT POWER
- Filing Date
- 2026-05-13
- Publication Date
- 2026-07-24
AI Technical Summary
Current rectifier condition assessment relies on the experience of maintenance personnel, leading to false positives, false negatives, and high maintenance costs, while ignoring the impact of non-vulnerable components on the rectifier's health status.
By acquiring the soft-start time and actual input energy during rectifier startup, comparing them with the reference input energy, and combining this with the DC bus voltage change rate, the system can automatically assess the rectifier's health status, including aging detection of bus capacitors, inductors, and discharge resistors.
It improves the accuracy of rectifier health status assessment, reduces testing costs, and requires no professional knowledge or on-site operation.
Smart Images
Figure CN122456740A_ABST
Abstract
Description
Technical Field
[0001] This invention relates to the field of power supply devices, and more specifically, to a rectifier health assessment method, an uninterruptible power supply, and a computer-readable storage medium. Background Technology
[0002] In power supply devices such as uninterruptible power supplies and chargers, rectifiers are typically used to convert externally supplied AC power into DC power. For example... Figure 1 The diagram shown is a circuit schematic of an existing three-phase bridge fully controlled rectifier. To ensure a stable DC output voltage, inductors, capacitors, and other components are typically added. Furthermore, to enhance safety, discharge resistors are added across the DC bus of the rectifier to allow for rapid power loss when the device stops operating. However, over time, the internal components of the power supply gradually age, increasing the probability of failure and severely impacting the rectifier's lifespan. Therefore, assessing the rectifier's health status is crucial for ensuring the stable operation of the uninterruptible power supply (UPS).
[0003] When maintaining the aforementioned power supply unit, professional maintenance personnel are required to perform regular on-site operations using specialized equipment. For example, when performing health status and fault detection on the rectifier in the power supply unit, it is necessary to first obtain the voltage and current values of components such as inductors, series resistors, and capacitors, and then calculate the changes in the performance parameters of each component based on the obtained detection values, and issue an early warning when the performance indicators exceed the normal range.
[0004] However, the aforementioned health status testing relies on experienced and knowledgeable maintenance personnel. For those lacking this knowledge and experience, misdiagnosis and missed detection can severely impact the stability and lifespan of the power supply unit. Furthermore, regular on-site maintenance may result in "over-maintenance" (disassembly and testing where no faults exist), malfunctions of specialized testing equipment, and ultimately, higher maintenance costs. In addition, rectifier health status assessments primarily focus on performance changes in vulnerable components, often neglecting the impact of other non-vulnerable components, leading to an overall rectifier health status that fails to meet maintenance requirements. Summary of the Invention
[0005] The technical problem to be solved by the present invention is to provide a rectifier health assessment method, an uninterruptible power supply, and a computer-readable storage medium, addressing the issue that the above-mentioned rectifier condition assessment operation relies on the experience of operation and maintenance personnel and has high maintenance costs.
[0006] The technical solution of this invention to solve the above-mentioned technical problems is to provide a rectifier health assessment method, applied to a power supply device with a fully controlled rectifier, the method comprising the following steps: (a) When the rectifier starts up, obtain the soft-start duration of the rectifier and the actual input electrical energy during the entire soft-start phase; (b) Obtaining reference input energy based on the soft-start duration, wherein the power supply device stores reference input energy corresponding to multiple different soft-start durations; (c) When the actual input power exceeds the reference input power and reaches the preset power threshold, control the rectifier to restart with multiple different soft-start durations; (d) Obtain the actual output power of the rectifier at each soft-start duration, and when the actual input power at each soft-start duration exceeds the reference input power at the corresponding soft-start duration and reaches the preset power threshold, confirm that the rectifier is in an abnormal health state. As a further improvement of the present invention, step (a) further includes the following steps: (a1) Start timing after the rectifier is started, and sample the input voltage of the rectifier and the current of each bridge arm in real time; (a2) Obtain the input current of the rectifier based on the current of each bridge arm of the rectifier, and generate the input power of the rectifier based on the input current and the input voltage; (a3) Calculate the input power based on the input power at each sampling time during the rectifier startup phase until the rectifier soft start is completed.
[0007] As a further improvement of the present invention, step (d) further includes the following steps: (d1) when the actual input energy under each soft start duration is lower than the reference input energy under the corresponding soft start duration by more than the first preset energy threshold, it is confirmed that the capacitance of the bus capacitor on the DC bus of the rectifier is abnormal, the filter inductor is abnormal, or the discharge resistor is abnormal. The abnormal filter inductor includes core aging and cracking or inter-turn short circuit, and the abnormal discharge resistor includes resistance aging and increase.
[0008] As a further improvement of the present invention, step (d) further includes the following steps: (d2) when the actual input energy at each soft start duration is higher than the reference input energy at the corresponding soft start duration by more than the second preset energy threshold, it is confirmed that the insulation performance of the bus capacitor, inductor and discharge resistor in the rectifier is abnormal.
[0009] As a further improvement of the present invention, the method further includes: (e1) Real-time detection of the DC bus voltage of the rectifier; (e2) When the fluctuation of the detected value of the DC bus voltage exceeds the preset range in multiple consecutive detection cycles, the rate of change of the detected value of the DC bus voltage and the actual input power change are obtained; (e3) Obtain the reference input power change amount according to the change rate, and the power supply device stores reference input power changes amount corresponding to multiple different voltage change rates; (e4) When the actual input power change exceeds the reference input power change within the preset change threshold range, the rectifier is confirmed to be in normal health condition.
[0010] As a further improvement of the present invention, step (e3) further includes: (e5) When the actual input power change exceeds the reference input power change and reaches the preset change threshold range, control the rectifier to operate with the DC bus voltage at multiple different change rates; (e6) Obtain the actual input power change of the rectifier at each rate of change, and when the actual input power change at each rate of change exceeds the reference input power change at the corresponding rate of change and reaches the preset change threshold range, confirm that the rectifier is in an abnormal health state.
[0011] As a further improvement of the present invention, step (c) further includes the following steps: (c1) Obtain the difference between the actual input energy and the reference input energy; (c2) When the difference is greater than the first preset value or less than the second preset value, control the rectifier to restart with multiple different soft-start durations.
[0012] As a further improvement of the present invention, step (c) further includes the following steps: (c3) Obtain the ratio of the actual input electrical energy to the reference input electrical energy; (c4) When the ratio is greater than the third preset value or less than the fourth preset value, control the rectifier to restart with multiple different soft-start durations, wherein the third preset value is greater than the fourth preset value; (c5) Obtain the average ratio of the actual input power under multiple different start-up durations to the reference input power under the corresponding durations, and confirm that the rectifier health status is abnormal if the average ratio is greater than a third preset value or less than a fourth preset value.
[0013] The present invention also provides an uninterruptible power supply, including a storage unit and a control chip, wherein the storage unit stores a computer program executable on the control chip, and the control chip executes the computer program to implement the steps of the rectifier health assessment method as described above.
[0014] The present invention also provides a computer-readable storage medium storing a computer program, which, when executed by a processor, implements the steps of the rectifier health assessment method described above.
[0015] The present invention has the following beneficial effects: by comparing the actual input electrical energy during the soft-start process of the rectifier with the corresponding reference input electrical energy, the health status of the rectifier is evaluated, which greatly improves the accuracy of the rectifier health status evaluation and reduces the testing cost. Attached Figure Description
[0016] Figure 1 This is the circuit schematic of an existing three-phase bridge rectifier.
[0017] Figure 2 This is a flowchart illustrating the rectifier health assessment method provided in an embodiment of the present invention.
[0018] Figure 3 This is a schematic diagram of the process for obtaining actual input electrical energy in the rectifier health assessment method provided in this embodiment of the invention.
[0019] Figure 4 This is a schematic diagram showing the changes in output voltage and output current when the DC bus voltage of the rectifier changes.
[0020] Figure 5 This is a schematic diagram of the process of assessing the health status of a rectifier when the DC bus voltage fluctuates, provided in an embodiment of the present invention. Detailed Implementation
[0021] To make the objectives, technical solutions, and advantages of this invention clearer, the invention will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative and not intended to limit the invention.
[0022] like Figure 2 The diagram shown is a flowchart illustrating the rectifier health assessment method provided in an embodiment of the present invention. This rectifier health assessment method can be applied to power supply devices (such as uninterruptible power supplies, chargers, etc.) with rectifiers, and assesses the health status of the rectifiers in the power supply device. In the aforementioned power supply device, the rectifier uses a fully controlled rectification method, that is, each switching transistor in the rectifier is controlled to be switched on and off by a PWM wave.
[0023] The rectifier health assessment method of this embodiment can be integrated into the control module of the power supply device. That is, the method can be implemented in conjunction with the control module of the power supply device to assess the health status of the rectifier in the power supply device. Specifically, the rectifier health assessment method of this embodiment includes the following steps (e.g., these steps are executed by the control module of the power supply device): Step S21: When the rectifier starts up, obtain the soft start duration of the rectifier and the actual input power during the entire soft start phase.
[0024] As is well known to those skilled in the art, rectifier soft-start is a necessary operation before the rectifier can operate normally. It limits the inrush current at the moment of power-on, protects circuit components, and ensures that the system smoothly establishes the DC bus voltage. Rectifier soft-start is usually achieved using a pre-charging resistor and a bypass contactor (or IGBT switch). Upon power-on, the DC bus current first flows through the current-limiting resistor to charge the capacitor. After the bus voltage reaches 90% to 95% or more of the rated value, the contactor closes, short-circuiting the pre-charging resistor, and the soft start is completed (the specific conditions for the soft start to be completed can be set according to different situations).
[0025] Specifically, after the rectifier is powered on and started, the power supply unit's control module samples parameters such as current and voltage at preset intervals, and calculates the actual input electrical energy of the rectifier during the soft-start phase based on the current, voltage, and other parameters sampled in each interval. The soft-start duration of the rectifier can be controlled by a timer. The timer starts counting when soft-start begins and stops counting when soft-start is complete.
[0026] Step S22: Obtain reference input energy based on the soft start duration. The power supply device stores reference input energy corresponding to multiple different soft start durations.
[0027] Specifically, before the power supply unit leaves the factory (at which point all components in the rectifier are basically brand new), the manufacturer can control the rectifier to start with different soft-start durations, obtain the input power of the rectifier under different soft-start durations, and write each soft-start duration and the corresponding input power as the reference input power into the storage module of the power supply unit.
[0028] In this step, the control module obtains the corresponding reference input energy using the soft-start duration as an index. Furthermore, the control module can use the reference input energy closest to the current soft-start duration as the reference input energy corresponding to the current soft-start duration; alternatively, the control module can obtain the reference input energy corresponding to two adjacent soft-start durations and calculate the reference input energy corresponding to the current soft-start duration through interpolation.
[0029] Step S23: Determine whether the actual input power in step S21 exceeds the reference input power obtained in step S22 and reaches a preset power threshold. If the actual input power exceeds the reference input power but does not reach the preset power threshold, proceed to step S24; otherwise, proceed to step S25. The aforementioned preset power threshold is also pre-stored in the power supply device, for example, it can be written to the power supply device's storage module by the power supply device manufacturer before the power supply device leaves the factory.
[0030] Step S24: Confirm that the rectifier is in good health and can operate normally to convert the input AC voltage into DC bus voltage.
[0031] Step S25: Control the rectifier to restart with multiple different soft-start durations.
[0032] In this step, the power supply unit's control module controls the switching of the semiconductor switching transistors in the rectifier by controlling the PWM drive voltage, thereby enabling the rectifier to start according to a set soft-start time. Specifically, the control module can control the rectifier to have the same soft-start time as during factory testing (i.e., corresponding to the soft-start time of each stored reference input energy). Controlling the switching of the semiconductor switching transistors by the PWM drive voltage can employ techniques conventional in the art, which will not be elaborated here.
[0033] Step S26: Obtain the actual output power of the rectifier at each soft-start duration, and compare the actual input power at each soft-start duration with the stored reference input power at each soft-start duration. When the actual input power at each soft-start duration exceeds the reference input power at the corresponding soft-start duration and reaches the preset power threshold, it is confirmed that the rectifier is in an abnormal health state, that is, the capacitors, inductors, resistors and other components in the rectifier have aged beyond the standard. In this step, the power supply unit's control module can output alarm information when it confirms an abnormal rectifier health status. This can be done through various means, such as displaying information via the graphical user interface, emitting sound or light signals, or sending information to maintenance personnel. Furthermore, when the difference between the actual input energy during a soft-start duration and the baseline input energy during the corresponding soft-start duration is within a preset threshold range, the rectifier's health status is directly confirmed to be normal, and the rectifier is put into normal operation.
[0034] The aforementioned rectifier health assessment method evaluates the rectifier's health status by comparing the actual input energy during the rectifier's soft-start process with the corresponding reference input energy. This method not only provides timely and proactive health status assessment of the power supply unit's rectifier but also significantly improves the accuracy of rectifier health status assessment because it does not rely on the experience or expertise of maintenance personnel. Furthermore, it reduces testing costs by requiring minimal increase in hardware costs and eliminating the need for downtime testing or component disassembly.
[0035] Furthermore, since non-vulnerable components in the rectifier also affect the actual input power of the rectifier during the soft-start process, the above-mentioned health status assessment method provides a more comprehensive assessment of the rectifier compared to existing inspections by maintenance personnel.
[0036] like Figure 3 As shown, in one embodiment of the present invention, step S21 further includes the following steps: Step S211: After the rectifier starts up, start timing and sample the rectifier input voltage and the current of each bridge arm in real time (at a set sampling period). The sampling of the rectifier input voltage and the current of each bridge arm can adopt conventional methods in this field, which will not be described in detail here.
[0037] Step S212: Obtain the input current of the rectifier at each sampling point based on the current of each bridge arm of the rectifier, and generate the input power of the rectifier based on the input current and input voltage.
[0038] Step S213: Calculate the input power based on the input power at each sampling time during the rectifier startup phase until the rectifier soft start is complete. That is, by multiplying and accumulating the input power at each sampling time with the sampling period until the rectifier soft start is complete, the accumulated result is the actual input power during the rectifier soft start phase.
[0039] The above method for obtaining the actual input power during the rectifier's soft-start phase is logically simple and requires virtually no additional hardware. Of course, in practical applications, the rectifier's input power can also be generated based on the energy conservation relationship between its input and output power, i.e.: Input power (P_in) = Output power (P_out) / Efficiency (η), where the output power can be calculated based on the current and voltage of each bridge arm, and the efficiency η is stored in advance as a rectifier parameter in the power supply's storage module.
[0040] In one embodiment of the present invention, step S26 further includes: when the actual input energy at each soft-start duration is lower than the reference input energy at the corresponding soft-start duration by more than a first preset energy threshold, confirming that the rectifier bus capacitor (i.e., bus capacitor) has an abnormal capacitance value, an abnormal filter inductor, or an abnormal discharge resistor. The bus capacitor can filter out the voltage ripple of the DC bus and stabilize the voltage of the DC bus. The abnormal filter inductor includes core aging and cracking or inter-turn short circuit. The abnormal discharge resistor includes resistance aging and increase.
[0041] The aforementioned first preset power threshold is also stored in advance in the power supply device's storage module, and can be determined based on the experience of technicians or experimental data.
[0042] From the charging energy calculation formula E=C×(V2²-V1²) / 2 (where V2 is the voltage of the bus capacitor when charging is complete, and V1 is the initial voltage of the bus capacitor), it can be seen that during the process of the DC bus voltage rising from 0V to the rated voltage (or slightly less than the rated voltage), the stored energy is directly proportional to the capacitance value, and the capacitance value directly affects the amount of input electrical energy. Under normal conditions for components such as the discharge resistor and inductor, during the rectifier soft-start process, current can be considered to flow to the bus capacitor to charge it. That is, when the actual capacitance value of the bus capacitor decreases due to aging, its stored electrical energy will decrease. Since the rectifier's input electrical energy, except for its own consumption, is stored in the bus capacitor, a decrease in input electrical energy during the soft-start stage necessarily means a decrease in the capacitance value of the bus capacitor. Using the above method, the aging degree of the bus capacitor can be accurately assessed, and it is simple and reliable.
[0043] In one embodiment of the present invention, step S26 further includes: when the actual input energy at each soft-start duration is higher than the reference input energy at the corresponding soft-start duration by more than a second preset energy threshold, confirming that the insulation performance of the bus capacitor, inductor and discharge resistor in the rectifier is abnormal.
[0044] The aforementioned second preset power threshold is also stored in advance in the power supply device's storage module, and can be determined based on the experience of technicians or experimental data.
[0045] Because aging of energy storage batteries can lead to decreased insulation, resulting in internal short circuits, as can aging of inductors causing reduced insulation and aging of discharge resistors leading to decreased resistance, these short circuits cause a rapid accumulation of heat, resulting in abnormal consumption of input electrical energy. Therefore, when the rectifier receives excessive input electrical energy, it indicates abnormal insulation performance of the bus capacitor, inductor, and discharge resistor. The method described above can accurately assess abnormal insulation performance of the bus capacitor, inductor, and discharge resistor, and is simple and reliable.
[0046] Since power supply units often need to operate continuously for a long time after being turned on, in order to more accurately provide early warning of the health status of the power supply unit, it is also necessary to conduct a health status assessment of the rectifier during the operation of the power supply unit, that is, to assess the health status of the rectifier after the power supply unit has completed its soft start.
[0047] Figure 4 The diagram illustrates the changes in output voltage 42 and output current 43 when the bus voltage 41 changes. As shown in the figure, when the inverter output of an uninterruptible power supply (UPS) or other power supply device is stable, it can be assumed that the change in input power represents the change in rectifier power during the process of the control module actively adjusting the rise and fall of the rectifier's bus voltage. Based on this, if... Figure 5 As shown, the above-mentioned power supply device health status assessment method, in addition to steps S21-S26, also includes the following steps: Step S271: Real-time detection of the DC bus voltage of the rectifier. The detection of this DC bus voltage can be performed using methods conventional in the art, and will not be elaborated upon here.
[0048] Step S272: When the fluctuation of the detected value of the DC bus voltage exceeds the preset range in multiple consecutive detection cycles, obtain the rate of change of the detected value of the DC bus voltage and the actual change in input power.
[0049] The rate of change of the detected DC bus voltage refers to the slope of the change in the detected DC bus voltage. The specific number of detection cycles can be set in advance as needed; typically, the number of detection cycles is smaller in applications with higher requirements. The change in actual input power refers to the difference between the input power in the first detection cycle and the input power in the last detection cycle across multiple detection cycles.
[0050] Step S273: Obtain the reference input power change based on the rate of change (the DC bus voltage change rate over multiple detection cycles). The power supply device stores reference input power changes corresponding to multiple different voltage change rates.
[0051] The aforementioned reference input power variations with different voltage change rates can be obtained by the manufacturer controlling the rectifier to operate at different bus voltage change rates before the power supply unit leaves the factory (at which time all components in the rectifier are basically brand new). The input power variations of the rectifier under each different bus voltage change rate are then written into the storage module of the power supply unit as reference input power variations.
[0052] Step S274: When the actual input power change exceeds the reference input power change within the preset change threshold range, confirm that the rectifier is in normal health condition.
[0053] In one embodiment of the present invention, step S273 is further comprising: when the actual input power change exceeds the reference input power change and reaches a preset change threshold range, controlling the rectifier to operate at multiple different change rates of DC bus voltage (i.e., bus voltage change rates corresponding to multiple pre-stored reference input power change rates); during the above process, acquiring the actual input power change of the rectifier at each change rate, and confirming an abnormal health status of the rectifier when the actual input power change at each voltage change rate exceeds the reference input power change at the corresponding voltage change rate and reaches a preset change threshold range.
[0054] Similarly, when the actual input power change at each voltage change rate is greater than the reference input power change at the corresponding voltage change rate and reaches the first preset change threshold range, the insulation performance of the bus capacitor, inductor, and discharge resistor is confirmed to be abnormal (and a corresponding warning signal can be output simultaneously). When the actual input power change at each voltage change rate is less than the reference input power change at the corresponding voltage change rate and reaches the second preset change threshold range, the aging of the bus capacitor is confirmed to be abnormal (and a corresponding warning signal can be output simultaneously). When the actual input power change at any voltage change rate is less than the reference input power change at the corresponding voltage change rate but does not reach the first preset change threshold range, or the actual input power change is less than the reference input power change at the corresponding voltage change rate but does not reach the second preset change threshold range, the rectifier is confirmed to be in normal health, and the power supply unit's control module controls the rectifier to operate normally.
[0055] In one embodiment of the present invention, the above Figure 2 Step S23 further includes: obtaining the difference between the actual input power and the reference input power, and when the difference is greater than the first preset value (positive value) or less than the second preset value (negative value), confirming that the actual input power of the rectifier exceeds the reference input power and reaches the preset power threshold, and then proceeding to step S25 to control the rectifier to restart with multiple different soft start durations.
[0056] In addition, the above Figure 2 Step S23 may further include the following steps: obtaining the ratio of actual input energy to reference input energy, and when the ratio is greater than a third preset value or less than a fourth preset value (the fourth preset value is less than the third preset value), confirming that the actual input energy of the rectifier exceeds the reference input energy and reaches a preset energy threshold, then proceeding to step S25, controlling the rectifier to restart with multiple different soft-start durations, and obtaining the average ratio of the actual input energy under multiple different start durations to the reference input energy under the corresponding start duration, and then confirming that the rectifier's health status is abnormal when the average ratio is greater than the third preset value or less than the fourth preset value.
[0057] Since the rectifier's startup loss is roughly equal to the sum of the loss caused by the rectifier's impedance and the loss caused by charging the bus capacitor, and the rectifier's impedance increases with time, the impedance loss of the rectifier will vary depending on the soft-start duration set. However, the energy stored in the bus capacitor is fixed. Therefore, the reference input energy corresponding to different startup durations will be different. If a difference is detected between the actual input energy and the reference input energy, it may be due to abnormal rectifier impedance or abnormal energy storage in the capacitor, resulting in an overestimation or underestimation. Considering fault tolerance, a reasonable range is taken as 70%-130%, i.e., the third preset value is 130% and the fourth preset value is 705%. Once it exceeds this range, the rectifier's health status is considered abnormal.
[0058] Both of the above methods can be used to determine whether the actual input power of the rectifier exceeds the reference input power and reaches the preset power threshold, thereby enabling the assessment of the rectifier's health status.
[0059] The present invention also provides an uninterruptible power supply, including a storage unit and a control chip, wherein the storage unit stores a computer program executable on the control chip, and the control chip executes the computer program to implement the steps of the rectifier health assessment method as described above.
[0060] The uninterruptible power supply in this embodiment is the same as the one described above. Figure 2-5 The rectifier health status assessment methods in the corresponding embodiments belong to the same concept. The specific implementation process can be found in the corresponding method embodiments. Furthermore, the technical features in the method embodiments are all applicable to this system embodiment, and will not be repeated here.
[0061] The present invention also provides a computer-readable storage medium storing a computer program, which, when executed by a processor, implements the steps of the rectifier health assessment method described above.
[0062] The computer-readable storage medium in this embodiment is the same as described above. Figure 2-5 The rectifier health status assessment methods in the corresponding embodiments belong to the same concept. The specific implementation process can be found in the corresponding method embodiments. The technical features in the method embodiments are also applicable to the embodiments of this computer-readable storage medium, and will not be repeated here.
[0063] It should be understood that the sequence number of each step in the above embodiments does not imply the order of execution. The execution order of each process should be determined by its function and internal logic, and should not constitute any limitation on the implementation process of the embodiments of this application.
[0064] Those skilled in the art will understand that, for the sake of convenience and brevity, the above-described division of functional units and modules is merely an example. In practical applications, the functions can be assigned to different functional units and modules as needed. The functional units and modules in the embodiments can be integrated into a single processor, or each unit can exist physically separately, or two or more units can be integrated into one unit. The integrated units can be implemented in hardware or as software functional units. Furthermore, the specific names of the functional units and modules are merely for easy differentiation and are not intended to limit the scope of protection of this application. The specific working processes of the units and modules in the above system can be referred to the corresponding processes in the foregoing method embodiments, and will not be repeated here.
[0065] In the above embodiments, the descriptions of each embodiment have different focuses. For parts that are not described in detail or recorded in a certain embodiment, please refer to the relevant descriptions of other embodiments.
[0066] Those skilled in the art will recognize that the units and algorithm steps of the various examples described in conjunction with the embodiments disclosed herein can be implemented in electronic hardware, or a combination of computer software and electronic hardware. Whether these functions are implemented in hardware or software depends on the specific application and design constraints of the technical solution. Those skilled in the art can use different methods to implement the described functions for each specific application, but such implementation should not be considered beyond the scope of this application.
[0067] In the embodiments provided in this application, it should be understood that the disclosed rectifier health status assessment method and uninterruptible power supply can be implemented in other ways. For example, the uninterruptible power supply embodiments described above are merely illustrative. Furthermore, the functional units in the various embodiments of this application can be integrated into a single processor, or each unit can exist physically separately, or two or more units can be integrated into a single unit. The integrated units described above can be implemented in hardware or as software functional units.
[0068] If the integrated module / unit is implemented as a software functional unit and sold or used as an independent product, it can be stored in a computer-readable storage medium. Based on this understanding, all or part of the processes in the methods of the above embodiments can also be implemented by a computer program instructing related hardware. The computer program can be stored in a computer-readable storage medium, and when executed by a processor, it can implement the steps of the various method embodiments described above. The computer program includes computer program code, which can be in the form of source code, object code, executable files, or certain intermediate forms. The computer-readable medium can include: any entity or interface switching device capable of carrying the computer program code, recording media, USB flash drive, portable hard drive, magnetic disk, optical disk, computer memory, read-only memory (ROM), random access memory (RAM), electrical carrier signals, telecommunication signals, and software distribution media, etc. It should be noted that the content included in the computer-readable medium can be appropriately added or removed according to the requirements of legislation and patent practice in the jurisdiction. For example, in some jurisdictions, according to legislation and patent practice, the computer-readable medium does not include electrical carrier signals and telecommunication signals.
[0069] The above-described embodiments are only used to illustrate the technical solutions of this application, and are not intended to limit them. Although this application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of this application, and should all be included within the protection scope of this application.
Claims
1. A rectifier health assessment method, applied to a power supply device with a fully controlled rectifier, characterized in that, The method includes the following steps: (a) When the rectifier starts up, obtain the soft-start duration of the rectifier and the actual input electrical energy during the entire soft-start phase; (b) Obtaining reference input energy based on the soft-start duration, wherein the power supply device stores reference input energy corresponding to multiple different soft-start durations; (c) When the actual input power exceeds the reference input power and reaches the preset power threshold, control the rectifier to restart with multiple different soft-start durations; (d) Obtain the actual output power of the rectifier at each soft-start duration, and when the actual input power at each soft-start duration exceeds the reference input power at the corresponding soft-start duration and reaches the preset power threshold, confirm that the rectifier is in an abnormal health state.
2. The rectifier health assessment method according to claim 1, characterized in that, Step (a) further includes the following steps: (a1) Start timing after the rectifier is started, and sample the input voltage of the rectifier and the current of each bridge arm in real time; (a2) Obtain the input current of the rectifier based on the current of each bridge arm of the rectifier, and generate the input power of the rectifier based on the input current and the input voltage; (a3) Calculate the input power based on the input power at each sampling time during the rectifier startup phase until the rectifier soft start is completed.
3. The rectifier health assessment method according to claim 1, characterized in that, Step (d) further includes the following steps: (d1) When the actual input energy at each soft start duration is lower than the reference input energy at the corresponding soft start duration by more than the first preset energy threshold, it is confirmed that the capacitance of the bus capacitor in the rectifier is abnormal, the filter inductor is abnormal, or the discharge resistor is abnormal. The abnormal filter inductor includes core aging and cracking or inter-turn short circuit, and the abnormal discharge resistor includes resistance aging and increase.
4. The rectifier health assessment method according to claim 1, characterized in that, Step (d) further includes the following steps: (d2) When the actual input energy at each soft-start duration is higher than the reference input energy at the corresponding soft-start duration by more than the second preset energy threshold, it is confirmed that the insulation performance of the bus capacitor, filter inductor and discharge resistor in the rectifier is abnormal.
5. The rectifier health assessment method according to claim 1, characterized in that, The method further includes: (e1) Real-time detection of the DC bus voltage of the rectifier; (e2) When the fluctuation of the detected value of the DC bus voltage exceeds the preset range in multiple consecutive detection cycles, the rate of change of the detected value of the DC bus voltage and the actual input power change are obtained; (e3) Obtain the reference input power change amount according to the change rate, and the power supply device stores reference input power changes amount corresponding to multiple different voltage change rates; (e4) When the actual input power change exceeds the reference input power change within the preset change threshold range, the rectifier is confirmed to be in normal health condition.
6. The rectifier health assessment method according to claim 5, characterized in that, The step (e3) is further followed by: (e5) When the actual input power change exceeds the reference input power change and reaches the preset change threshold range, control the rectifier to operate with the DC bus voltage at multiple different change rates; (e6) Obtain the actual input power change of the rectifier at each rate of change, and when the actual input power change at each rate of change exceeds the reference input power change at the corresponding voltage rate of change and reaches the preset change threshold range, confirm that the rectifier is in an abnormal health state.
7. The rectifier health assessment method according to any one of claims 1-6, characterized in that, Step (c) further includes the following steps: (c1) Obtain the difference between the actual input energy and the reference input energy; (c2) When the difference is greater than the first preset value or less than the second preset value, control the rectifier to restart with multiple different soft-start durations.
8. The rectifier health assessment method according to any one of claims 1-6, characterized in that, Step (c) further includes the following steps: (c3) Obtain the ratio of the actual input electrical energy to the reference input electrical energy; (c4) When the ratio is greater than the third preset value or less than the fourth preset value, control the rectifier to restart with multiple different soft-start durations, wherein the third preset value is greater than the fourth preset value; (c5) Obtain the average ratio of the actual input power under multiple different start-up durations to the reference input power under the corresponding durations, and confirm that the rectifier health status is abnormal if the average ratio is greater than a third preset value or less than a fourth preset value.
9. An uninterruptible power supply, characterized in that, The device includes a storage unit and a control chip. The storage unit stores a computer program that can be executed on the control chip, and the control chip executes the computer program to implement the steps of the rectifier health assessment method as described in any one of claims 1-8.
10. A computer-readable storage medium, characterized in that, The storage medium stores a computer program, which, when executed by a processor, implements the steps of the rectifier health assessment method as described in any one of claims 1-8.