CN117723820A - UPS nonlinear load current reconstruction method - Google Patents
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Abstract
The invention discloses a UPS nonlinear load current reconstruction method, which is characterized in that an original current value acquired by a current sensor in UPS equipment is sampled, whether the current exceeding range occurs in the sampled current in a sampling period is judged according to the original current value, a current reconstruction equation is determined according to sampling points in the sampling period when the current exceeding range does not occur in the sampled current, and the sampled current in the sampling period when the current exceeding range occurs in the sampled current is subjected to current reconstruction according to the current reconstruction equation, so that the range of the current sensor of the UPS equipment is not limited by nonlinear load current, and even if the current exceeds the range of the current sensor of the UPS equipment, the accuracy of the nonlinear load current estimation can be ensured through the current reconstruction, and the accurate and timely overload protection function of the UPS equipment is ensured.
Description
Technical Field
The invention relates to the technical field of uninterruptible power supplies, in particular to a UPS nonlinear load current reconstruction method.
Background
In important occasions such as data centers and computer rooms, UPS (uninterruptible power supply) equipment is often required to ensure uninterrupted power supply of the equipment. The loads of the data center and the computer room are mostly nonlinear load equipment of a switching power supply type, which is called as an RCD load in IEC standard and is characterized by low rated current, high peak factor and low input power factor. Current peak factor should not be less than 3 when UPS is required to have a nonlinear load (RCD load) in industry application standards for UPS. For example, a load current having an effective value of 100A, the peak current tends to exceed 300A.
The UPS equipment generally needs to collect three-phase inversion output current, three-phase bypass output current and the like; meanwhile, the currents need to be sampled and calculated to obtain effective values, so that relevant overload protection, current sharing control and the like are carried out. For example, in some UPS devices: the inversion output current is more than 150%, and overload protection (bypass) is needed after 200 ms; bypass current >200%, and overload protection is required after 200 ms. When current collection is carried out, current sensors such as a Hall sensor and a mutual inductor are generally selected, and in order to cover the peak of RCD load current, the measuring range of the current sensor in most UPS equipment factories at present is required to be configured to be about 4.5 times of the effective value of rated resistive load current; the current sensor for the bypass current is often about 6 times. Configuring such a wide-range current sensor may cause adverse factors such as an increase in cost of UPS equipment and an increase in layout volume. On the other hand, in the UPS power consumption configuration, in order to improve the reliability and the subsequent upgrade capability of the UPS system, the UPS is generally configured around half-load. The current sensor with the wide range can lead to that the current under the normal working condition of the UPS is only about 1/10 of the full range of the selected current sensor, thereby leading to the reduction of the current acquisition precision. In addition, due to uncertainty of the UPS rear-stage RCD load, the peak value coefficient of partial RCD load current is larger than 3, and short-time current is larger when some RCD load devices are started; therefore, even if the measuring range of the current sensor in most UPS equipment factories is configured to be about 4.5 times of the rated current effective value, the RCD load current peak exceeds the measuring range of the current sensor at certain moments, and the sampling current topping phenomenon occurs. The current effective value obtained by collection and calculation is often smaller than the actual value, and the functional targets of correct and timely overload protection and the like of the UPS equipment cannot be realized.
Disclosure of Invention
The invention aims to solve the problem of the prior art, and a first aim of the invention is to provide a UPS nonlinear load current reconstruction method capable of solving the problem of larger current sensor measuring range required by nonlinear load current collection in UPS equipment and improving the accuracy of UPS nonlinear load current estimation.
A second object of the present invention is to provide a computer readable medium carrying out the reconstruction method described above.
A third object of the present invention is to provide an electronic device performing the above-mentioned reconstruction method.
To achieve the above object, a first aspect of the present invention provides a method for reconstructing a nonlinear load current of a UPS, including the steps of:
acquiring an original current value acquired by a current sensor in UPS equipment;
sampling the obtained original current values according to the time sequence of the current sensor;
judging whether the sampling current value at each moment in the sampling period exceeds the range of the current sensor according to whether the sampling current value at each moment in the sampling period meets a first preset condition;
judging whether the sampling current in the sampling period exceeds a current overrun range according to whether the duration of the sampling current value exceeding the range of the current sensor in the sampling continuous period meets a second preset condition;
determining a first current reconstruction equation according to sampling points in a first sampling period before a sampling current generation current overscan sampling period;
determining a second current reconstruction equation according to sampling points in a second sampling period after the sampling current generation current overscan sampling period;
and carrying out current reconstruction on the sampling current in the sampling period with the current overscan according to the first current reconstruction equation and the second current reconstruction equation.
Further, according to whether the sampling current value at each time in the sampling period meets a first predetermined condition, determining whether the sampling current value at the corresponding time exceeds the range of the current sensor includes:
the sampling current value at the sampling moment in the sampling period meets Imax-deltaI < I < imax+deltaI, and the sampling current value at the sampling moment is judged to exceed the range of the current sensor;
the sampling current value I of the sampling moment in the sampling period is less than Imax-delta I, and the sampling current value of the sampling moment is judged not to exceed the range of the current sensor;
where I represents the sampled current value and Imax represents the maximum current value of the current sensor range.
Further, according to whether the duration of the sampling current value in the sampling continuous period exceeding the range of the current sensor range meets a second predetermined condition, determining that the sampling current in the sampling period exceeds the range of the current sensor range includes:
the duration time that the sampling current value in the sampling continuous period exceeds the range of the current sensor range meets t > tset, and the occurrence of current overscan of the sampling current in the sampling period is judged; where t represents a duration of time during which the sampled current value exceeds the range of the current sensor, and tset represents a predetermined judgment time.
Further, determining a first current reconstruction equation from sampling points in a first sampling period prior to the sampling current occurrence current overscan sampling period includes:
selecting two sampling points in the first sampling period according to the two sampling pointsSampling time t of point r1、 t r5 And a sampling current value I r1、 I r5 Calculating the slope K of the current rising section r1 ；
According to the rising section slope K r1 Determining a first reconstruction equation I t -I r1 ＝K r1 (t-t r1 )。
Further, determining a second current reconstruction equation from sampling points in a second sampling period after the sampling current occurrence current overscan sampling period includes:
selecting two sampling points in the second sampling period according to sampling time t of the two sampling points f1、 t f5 And a sampling current value I f1、 I f5 Calculating the slope K of the current falling section f1 ；
According to the slope K of the descent segment f1 Determining a second reconstruction equation I t -I f1 ＝K f1 (t-t f1 )。
Further, determining a first current reconstruction equation from sampling points in a first sampling period prior to the sampling current occurrence current overscan sampling period includes:
selecting three sampling points in the first sampling period, and calculating current rising slopes Kr1 and Kr2 according to sampling moments tr1, tr5 and tr9 of the three sampling points and sampling current values Ir1, ir5 and Ir 9;
calculating the rising slope change amount delta kr=kr1-kr2 according to the rising slopes Kr1, kr2;
determining a reconstruction current rising section slope kr=kr1+Δkr according to the rising slope variation;
determining a first reconstruction equation I from the rising-section slope Kr t -I r1 ＝K r (t-t r1 )。
Further, determining a second current reconstruction equation from sampling points in a second sampling period after the sampling current occurrence current overscan sampling period includes:
selecting three sampling points in the second sampling period according to the sampling moments t of the three sampling points f1、 t f5、 t f9 And a sampling current value I f1、 I f5、 I f9 Calculating the current falling slope K f1、 K f2 ；
According to the falling slope K f1、 K f2 Calculating the change amount delta K of the falling slope f ＝K f1 -K f2；
Determining a slope kf=kf1+Δkf of a falling section of the reconstruction current according to the falling slope variation;
determining a second reconstruction equation I based on the descent slope Kf t -I f1 ＝K f (t-t f1 )。
Further, performing current reconstruction on the sampling current in the current overscan sampling period according to the first current reconstruction equation and the second current reconstruction equation comprises:
calculating an intersection point (I) of the two current reconstruction equations from the first current reconstruction equation and the second current reconstruction equation p ,t p ) Determining a peak sampling point having a maximum current value within the sampling period;
carrying out current reconstruction on the sampling current before the moment corresponding to the peak sampling point by adopting the first current reconstruction equation;
and carrying out current reconstruction on the sampling current after the moment corresponding to the peak sampling point by adopting the second current reconstruction equation.
Further, the method further comprises the following steps:
the sampling current generates a current overscan in the sampling period, and the UPS nonlinear load current value is estimated according to the first current reconstruction equation and the second current reconstruction equation;
and in the sampling period, no current overscan occurs in the sampling current, and the original current value acquired by the current sensor is used as the UPS nonlinear load current value.
A second aspect of the present invention provides an electronic device, comprising:
one or more processors; and
storage means for storing one or more programs which, when executed by the one or more processors, cause the one or more processors to implement the method as described in the first aspect above.
A third aspect of the invention provides a computer readable medium having stored thereon a computer program which, when executed by a processor, implements a method as described in the first aspect above.
According to the invention, the original current value acquired by the current sensor in the UPS device is sampled, whether the current is in an over-range or not is judged according to the original current value, a current reconstruction equation is determined according to the sampling point in the sampling period when the current is not in the over-range, and the current reconstruction equation is used for reconstructing the current in the sampling period when the current is in the over-range, so that the range of the current sensor of the UPS device is not limited by the nonlinear load current, even if the current exceeds the range of the current sensor of the UPS device, the accuracy of nonlinear load current estimation can be ensured through the current reconstruction, the accurate and timely overload protection function of the UPS device is ensured, and the UPS device can select a small-range current sensor which is closer to the current in the working state of the UPS device, thereby improving the current acquisition precision.
It is to be understood that both the foregoing general description and the following detailed description are exemplary and explanatory only and are not restrictive of the invention as claimed.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings required for the description of the embodiments will be briefly described below, and it is apparent that the drawings in the following description are only some embodiments of the present invention, and other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.
FIG. 1 is a flow chart illustrating a method for reconstructing a nonlinear load current of a UPS according to an embodiment of the present invention;
FIG. 2 is a schematic diagram of a nonlinear load current waveform in a normal state;
FIG. 3 is a schematic diagram of a nonlinear load current waveform after the sampling current exceeds the measurement range;
FIGS. 4A and 4B are current waveforms reconstructed by a current reconstruction method according to an embodiment of the present invention;
fig. 5A and 5B are current waveforms reconstructed by a current reconstruction method according to another embodiment of the present invention.
Detailed Description
Example embodiments will now be described more fully with reference to the accompanying drawings. However, the exemplary embodiments may be embodied in many forms and should not be construed as limited to the examples set forth herein; rather, these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the concept of the example embodiments to those skilled in the art.
Furthermore, the described features, structures, or characteristics may be combined in any suitable manner in one or more embodiments. In the following description, numerous specific details are provided to give a thorough understanding of embodiments of the invention. One skilled in the relevant art will recognize, however, that the invention may be practiced without one or more of the specific details, or with other methods, components, devices, steps, etc. In other instances, well-known methods, devices, implementations, or operations are not shown or described in detail to avoid obscuring aspects of the invention.
The block diagrams depicted in the figures are merely functional entities and do not necessarily correspond to physically separate entities. That is, the functional entities may be implemented in software, or in one or more hardware modules or integrated circuits, or in different networks and/or processor devices and/or microcontroller devices.
The flow diagrams depicted in the figures are exemplary only, and do not necessarily include all of the elements and operations/steps, nor must they be performed in the order described. For example, some operations/steps may be decomposed, and some operations/steps may be combined or partially combined, so that the order of actual execution may be changed according to actual situations.
As shown in fig. 1, the method for reconstructing the nonlinear load current of the UPS of the present invention includes the following steps:
step S100: acquiring an original current value acquired by a current sensor in UPS equipment;
step S110: sampling the obtained original current values according to the time sequence of the current sensor;
step S120: judging whether the sampling current value at each moment in the sampling period exceeds the range of the current sensor according to whether the sampling current value at each moment in the sampling period meets a first preset condition;
step S130: judging whether the sampling current in the sampling period exceeds a current overrun range according to whether the duration of the sampling current value exceeding the range of the current sensor in the sampling continuous period meets a second preset condition;
step S140: determining a first current reconstruction equation according to sampling points in a first sampling period before a sampling current generation current overscan sampling period;
step S150: determining a second current reconstruction equation according to sampling points in a second sampling period after the sampling current generation current overscan sampling period;
step S160: and carrying out current reconstruction on the sampling current in the sampling period with the current overscan according to the first current reconstruction equation and the second current reconstruction equation.
In an embodiment of the present invention, step S120 specifically includes:
the sampling current value at the sampling moment in the sampling period meets Imax-deltaI < I < imax+deltaI, and the sampling current value at the sampling moment is judged to exceed the range of the current sensor;
the sampling current value I of the sampling moment in the sampling period is less than Imax-delta I, and the sampling current value of the sampling moment is judged not to exceed the range of the current sensor;
where I represents the sampled current value and Imax represents the maximum current value of the current sensor range.
In an embodiment of the present invention, step S130 specifically includes:
the duration time that the sampling current value in the sampling continuous period exceeds the range of the current sensor range meets t > tset, and the occurrence of current overscan of the sampling current in the sampling period is judged; where t represents a duration of time during which the sampled current value exceeds the range of the current sensor, and tset represents a predetermined judgment time. In this embodiment, the current collection frequency is 8Khz, and the current collection interval time is 0.125ms each time. If all 3 consecutive samples are within the judgment range of the full range Imax, the judgment considers that the sampling current is over-range in the sampling period.
In an embodiment of the present invention, step S140 specifically includes:
selecting two sampling points in the first sampling period, and calculating a current rising section slope Kr1 according to sampling moments tr1 and tr5 of the two sampling points and sampling current values Ir1 and Ir 5;
the first reconstruction equation It-ir1=kr1 (t-tr 1) is determined from the rising-section slope Kr 1.
In this embodiment, as shown in fig. 4A, the 1 st sampling point and the 5 th sampling point before the current waveform enters the truncated are selected as the base points to calculate the current rising slope. Wherein Ir1 is a current value obtained by the 1 st acquisition point before topping, tr1 is a time value corresponding to the 1 st acquisition point before topping; ir5 is the current value obtained by the 5 th acquisition point before shaving, tr5 is the time value corresponding to the 5 th acquisition point before shaving. The rising slope kr1= (Ir 1-Ir 5)/(tr 1-tr 5) was calculated. If the 3 continuous samplings are in the judging range smaller than the full range Imax, judging that the current exits the over-range, and starting to calculate the current falling slope of a period of time after the current exits the over-range.
In an embodiment of the present invention, the step S150 specifically includes:
selecting two sampling points in the second sampling period, and calculating a current falling slope Kf1 according to sampling moments tf1 and tf5 of the two sampling points and sampling current values If1 and If 5;
the second reconstruction equation It-If 1=kf1 (t-tf 1) is determined from the falling-segment slope Kf 1. In private, as shown in fig. 4A, the 1 st sampling point and the 5 th sampling point after the current waveform exits the truncated are selected as the base points to calculate the current falling slope. Wherein If1 is a current value obtained by the 1 st acquisition point after the ejection and tf1 is a time value corresponding to the 1 st acquisition point after the ejection; if5 is the current value obtained at the 5 th acquisition point after the ejection and tf5 is the time value corresponding to the 5 th acquisition point after the ejection. The falling slope kf1= (If 1-If 5)/(tf 1-tf 5) is calculated.
In another embodiment of the present invention, step S140 specifically includes:
selecting three sampling points in the first sampling period, and calculating current rising slopes Kr1 and Kr2 according to sampling moments tr1, tr5 and tr9 of the three sampling points and sampling current values Ir1, ir5 and Ir 9;
calculating the rising slope change amount delta kr=kr1-kr2 according to the rising slopes Kr1, kr2;
determining a reconstruction current rising section slope kr=kr1+Δkr according to the rising slope variation;
the first reconstruction equation It-ir1=kr (t-tr 1) is determined from the rising-section slope Kr.
In this embodiment, as shown in fig. 5A, the 1 st sampling point and the 5 th sampling point before the current waveform enters the truncated are selected as the base points to calculate the rising slope Kr1 of the current rising slope section 1; the rising slope Kr2 of the current rising slope section 2 is calculated with the 5 th sampling point and the 9 th sampling point as the base points. Wherein Ir1 is a current value obtained by the 1 st acquisition point before topping, tr1 is a time value corresponding to the 1 st acquisition point before topping; ir5 is the current value obtained by the 5 th acquisition point before topping, tr5 is the time value corresponding to the 5 th acquisition point before topping; ir9 is the current value obtained by the 9 th acquisition point before shaving, tr9 is the time value corresponding to the 9 th acquisition point before shaving. The rising slope kr1= (Ir 1-Ir 5)/(tr 1-tr 5) of the rising slope section 1 and the rising slope kr2= (Ir 5-Ir 9)/(tr 5-tr 9) of the rising slope section 2 are calculated based on the coordinates of the sampling points, and the rising slope change amount Δkr=kr1-kr2. The reconstructed rising-section current waveform adopts a rising slope kr=kr1+Δkr. In this embodiment, the slope of the reconstructed current is determined according to the slope variation, so that the accuracy of current waveform estimation can be further improved.
In another embodiment of the present invention, the step S150 specifically includes:
selecting three sampling points in the second sampling period, and calculating current falling slopes Kf1 and Kf2 according to sampling moments tf1, tf5 and tf9 of the three sampling points and sampling current values If1, if5 and If 9;
calculating a descending slope change amount Δkf=kf1-kf2 from the descending slopes Kf1, kf2;
determining a slope kf=kf1+Δkf of a falling section of the reconstruction current according to the falling slope variation;
the second reconstruction equation It-If 1=kf (t-tf 1) is determined from the falling-segment slope Kf.
In this embodiment, as shown in fig. 5A, the 1 st sampling point and the 5 th sampling point after the current waveform exits from the truncated are selected as the base points to calculate the descent slope Kf1 of the current descent slope segment 1; the falling slope Kf2 of the current falling slope segment 2 is calculated with the 5 th sampling point and the 9 th sampling point as base points. Wherein If1 is a current value obtained by the 1 st acquisition point after the ejection and tf1 is a time value corresponding to the 1 st acquisition point after the ejection; if5 is the current value obtained by the 5 th acquisition point after the ejection and tf5 is the time value corresponding to the 5 th acquisition point after the ejection; if9 is the current value obtained at the 9 th acquisition point after the ejection and tf9 is the time value corresponding to the 9 th acquisition point after the ejection. And calculating the descending slope Kf1= (If 1-If 5)/(tf 1-tf 5) of the descending slope section 1 according to the coordinates of the sampling points, wherein the descending slope Kf2= (If 5-If 9)/(tf 5-tf 9) of the descending slope section 2, and then the descending slope change amount delta kf=Kf1-kf2. The reconstructed falling segment current waveform adopts a falling slope kf=kf1+Δkf.
In an embodiment of the present invention, step S160 specifically includes:
calculating an intersection point (Ip, tp) of the two current reconstruction equations according to the first current reconstruction equation and the second current reconstruction equation, and determining a peak sampling point with a maximum current value in a sampling period;
carrying out current reconstruction on the sampling current before the moment corresponding to the peak sampling point by adopting the first current reconstruction equation;
and carrying out current reconstruction on the sampling current after the moment corresponding to the peak sampling point by adopting the second current reconstruction equation.
In the present embodiment, two straight lines passing through the first current reconstruction equation and the second current reconstruction equation meet to obtain a reconstructed current waveform as shown in fig. 4B and 5B.
In one embodiment of the present invention, the method of the present invention further comprises:
the sampling current generates a current overscan in the sampling period, and the UPS nonlinear load current value is estimated according to the first current reconstruction equation and the second current reconstruction equation;
and in the sampling period, no current overscan occurs in the sampling current, and the original current value acquired by the current sensor is used as the UPS nonlinear load current value. That is, the intersection point (Ip, tp) of two straight lines is calculated at the same time, that is, the peak current. The current value estimation before tp is applied to the first current reconstruction equation and the current value estimation after tp is applied to the second current reconstruction equation, so that the estimated current value It at any time point of the truncated period can be obtained. The normal sampling current value is used outside the topping section, and the current effective value, the peak current and other parameters of the RCD load are recalculated by using the corresponding current estimated value in the topping time period, so that the functional targets of correct and timely overload protection and the like of the UPS device are realized.
A second aspect of the present invention provides an electronic device, comprising:
one or more processors; and
storage means for storing one or more programs which, when executed by the one or more processors, cause the one or more processors to implement the method as described in the first aspect above.
The electronic device is in the form of a general purpose computing device. Components of an electronic device may include, but are not limited to: the system comprises at least one processing unit, at least one storage unit, a bus for connecting different system components (comprising the storage unit and the processing unit) and a display unit.
Wherein the storage unit stores program code executable by the processing unit such that the processing unit performs steps according to various exemplary embodiments of the present invention described in the above section of the exemplary method of the present specification. For example, the processing unit may perform steps S100 to S160 as shown in fig. 1.
The memory unit may include readable media in the form of volatile memory units, such as Random Access Memory (RAM) and/or cache memory units, and may further include Read Only Memory (ROM).
The storage unit may also include a program/utility having a set (at least one) of program modules including, but not limited to: an operating system, one or more application programs, other program modules, and program data, each or some combination of which may include an implementation of a network environment.
The bus may be one or more of several types of bus structures, including memory units
A bus or memory unit controller, a peripheral bus, an accelerated graphics port, a processing unit, or a local bus using any of a variety of bus architectures.
The electronic device may also communicate with one or more external devices (e.g., keyboard, pointing device, bluetooth device, etc.), with one or more devices that enable a user to interact with the electronic device, and/or with any device (e.g., router, modem, etc.) that enables the electronic device to communicate with one or more other computing devices. Such communication may be through an input/output (I/O) interface. And, the electronic device may also communicate with one or more networks such as a Local Area Network (LAN), a Wide Area Network (WAN), and/or a public network, such as the Internet, through a network adapter. As shown, the network adapter communicates with other modules of the electronic device over a bus. It should be appreciated that although not shown, other hardware and/or software modules may be used in connection with an electronic device, including but not limited to: microcode, device drivers, redundant processing units, external disk drive arrays, RAID systems, tape drives, data backup storage systems, and the like.
From the above description of embodiments, those skilled in the art will readily appreciate that the example embodiments described herein may be implemented in software, or in combination with the necessary hardware. Thus, the technical solution according to the embodiments of the present disclosure may be embodied in the form of a software product, which may be stored in a non-volatile storage medium (may be a CD-ROM, a U-disk, a mobile hard disk, etc.) or on a network, and includes several instructions to cause a computing device (may be a personal computer, a server, a terminal device, or a network device, etc.) to perform the method according to the embodiments of the present disclosure.
A third aspect of the invention provides a computer readable medium having stored thereon a computer program which, when executed by a processor, implements a method as described in the first aspect above.
In conclusion, the current sensor with a smaller measuring range can be selected by adopting the RCD load current reconstruction mode, and the problems of larger volume and higher cost of the current sensor in UPS equipment are solved. Because the current sensor with a smaller measuring range is selected, the current sensor is closer to the current of the UPS equipment in the normal working state, and the current collection precision is improved. In addition, the reconstruction method of the invention can re-estimate the partial current of the cut top, thereby realizing the functional targets of correct and timely overload protection and the like of UPS equipment.
A program product for implementing the above method according to an embodiment of the invention is described, which may employ a portable compact disc read only memory (CD-ROM) and comprise program code and may be run on a terminal device, such as a personal computer. However, the program product of the present invention is not limited thereto, and in this document, a 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.
The program product may employ any combination of one or more readable media. The readable medium may be a readable signal medium or a readable storage medium. The readable storage medium can be, for example, but is not limited to, an electronic, magnetic, optical, electromagnetic, infrared, or semiconductor system, apparatus, or device, or a combination of any of the foregoing. More specific examples (a non-exhaustive list) of the readable storage medium would include the following: an electrical connection having one or more wires, a portable disk, a hard disk, random Access Memory (RAM), read-only memory (ROM), erasable programmable read-only memory (EPROM or flash memory), optical fiber, portable compact disk read-only memory (CD-ROM), an optical storage device, a magnetic storage device, or any suitable combination of the foregoing.
The computer readable signal medium may include a data signal propagated in baseband or as part of a carrier wave with readable program code embodied therein. Such a propagated data signal may take any of a variety of forms, including, but not limited to, electro-magnetic, optical, or any suitable combination of the foregoing. A readable signal medium may also be any readable medium that is not a readable storage medium and that can communicate, propagate, or transport a program for use by or in connection with an instruction execution system, apparatus, or device.
Program code embodied on a readable medium may be transmitted using any appropriate medium, including but not limited to wireless, wireline, optical fiber cable, RF, etc., or any suitable combination of the foregoing. Program code for carrying out operations of the present invention may be written in any combination of one or more programming languages, including an object oriented programming language such as Java, C++ or the like and conventional procedural programming languages, such as the "C" programming language or similar programming languages. The program code may execute entirely on the user's computing device, partly on the user's device, as a stand-alone software package, partly on the user's computing device, partly on a remote computing device, or entirely on the remote computing device or server. In the case of remote computing devices, 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., connected via the Internet using an Internet service provider).
Furthermore, the above-described drawings are only schematic illustrations of processes included in the method according to the exemplary embodiment of the present invention, and are not intended to be limiting. It will be readily appreciated that the processes shown in the above figures do not indicate or limit the temporal order of these processes. In addition, it is also readily understood that these processes may be performed synchronously or asynchronously, for example, among a plurality of modules.
Other embodiments of the disclosure will be apparent to those skilled in the art from consideration of the specification and practice of the disclosure disclosed herein. This application is intended to cover any adaptations, uses, or adaptations of the disclosure following, in general, the principles of the disclosure and including such departures from the present disclosure as come within known or customary practice within the art to which the disclosure pertains. It is intended that the specification and examples be considered as exemplary only, with a true scope and spirit of the disclosure being indicated by the following claims.
Claims (11)
1. A UPS nonlinear load current reconstruction method is characterized by comprising the following steps:
acquiring an original current value acquired by a current sensor in UPS equipment;
sampling the obtained original current values according to the time sequence of the current sensor;
judging whether the sampling current value at each moment in the sampling period exceeds the range of the current sensor according to whether the sampling current value at each moment in the sampling period meets a first preset condition;
judging whether the sampling current in the sampling period exceeds a current overrun range according to whether the duration of the sampling current value exceeding the range of the current sensor in the sampling continuous period meets a second preset condition;
determining a first current reconstruction equation according to sampling points in a first sampling period before a sampling current generation current overscan sampling period;
determining a second current reconstruction equation according to sampling points in a second sampling period after the sampling current generation current overscan sampling period;
and carrying out current reconstruction on the sampling current in the sampling period with the current overscan according to the first current reconstruction equation and the second current reconstruction equation.
2. The UPS nonlinear load current reconstruction method of claim 1, wherein determining whether the sampled current value at the corresponding time instant exceeds the current sensor range according to whether the sampled current value at each time instant in the sampling period satisfies a first predetermined condition comprises:
the sampling current value at the sampling moment in the sampling period meets Imax-deltaI < I < imax+deltaI, and the sampling current value at the sampling moment is judged to exceed the range of the current sensor;
the sampling current value I of the sampling moment in the sampling period is less than Imax-delta I, and the sampling current value of the sampling moment is judged not to exceed the range of the current sensor;
where I represents the sampled current value and Imax represents the maximum current value of the current sensor range.
3. The UPS nonlinear load current reconstruction method of claim 1, wherein determining that the sampling current in the sampling period is out of current range based on whether the duration of the sampling current value in the sampling period exceeding the current sensor range meets a second predetermined condition comprises:
the duration time that the sampling current value in the sampling continuous period exceeds the range of the current sensor range meets t > tset, and the occurrence of current overscan of the sampling current in the sampling period is judged; where t represents a duration of time during which the sampled current value exceeds the range of the current sensor, and tset represents a predetermined judgment time.
4. The UPS nonlinear load current reconstruction method of claim 1, wherein determining a first current reconstruction equation from sampling points in a first sampling period preceding the sampling current occurrence current overscan sampling period comprises:
selecting two sampling points in the first sampling period according to sampling time t of the two sampling points r1、 t r5 And a sampling current value I r1、 I r5 Calculating the slope K of the current rising section r1 ；
According to the rising section slope K r1 Determining a first reconstruction equation I t -I r1 ＝K r1 (t-t r1 )。
5. The UPS nonlinear load current reconstruction method of claim 1, wherein determining a second current reconstruction equation from sampling points in a second sampling period after the sampling current occurrence current overscan sampling period comprises:
selecting two sampling points in the second sampling period according to sampling time t of the two sampling points f1、 t f5 And a sampling current value I f1、 I f5 Calculating the slope K of the current falling section f1 ；
According to the slope K of the descent segment f1 Determining a second reconstruction equation I t -I f1 ＝K f1 (t-t f1 )。
6. The UPS nonlinear load current reconstruction method of claim 1, wherein determining a first current reconstruction equation from sampling points in a first sampling period preceding the sampling current occurrence current overscan sampling period comprises:
selecting three sampling points in the first sampling period, and calculating current rising slopes Kr1 and Kr2 according to sampling moments tr1, tr5 and tr9 of the three sampling points and sampling current values Ir1, ir5 and Ir 9;
calculating the rising slope change amount delta kr=kr1-kr2 according to the rising slopes Kr1, kr2;
determining a reconstruction current rising section slope kr=kr1+Δkr according to the rising slope variation;
determining a first reconstruction equation I from the rising-section slope Kr t -I r1 ＝K r (t-t r1 )。
7. The UPS nonlinear load current reconstruction method of claim 1, wherein determining a second current reconstruction equation from sampling points in a second sampling period after the sampling current occurrence current overscan sampling period comprises:
selecting three sampling points in the second sampling period according to the sampling moments t of the three sampling points f1、 t f5、 t f9 And a sampling current value I f1、 I f5、 I f9 Calculating the current falling slope K f1、 K f2 ；
According to the falling slope K f1、 K f2 Calculating the change amount delta K of the falling slope f ＝K f1 -K f2；
Determining a slope kf=kf1+Δkf of a falling section of the reconstruction current according to the falling slope variation;
determining a second reconstruction equation I based on the descent slope Kf t -I f1 ＝K f (t-t f1 )。
8. The UPS nonlinear load current reconstruction method of any one of claims 1-7, wherein current reconstructing the sample current during the occurrence of current overscan sampling periods from the first current reconstruction equation and the second current reconstruction equation comprises:
calculating an intersection point (I) of the two current reconstruction equations from the first current reconstruction equation and the second current reconstruction equation p ,t p ) Determining a peak sampling point having a maximum current value within the sampling period;
carrying out current reconstruction on the sampling current before the moment corresponding to the peak sampling point by adopting the first current reconstruction equation;
and carrying out current reconstruction on the sampling current after the moment corresponding to the peak sampling point by adopting the second current reconstruction equation.
9. The UPS nonlinear load current reconstruction method of claim 1, further comprising:
the sampling current generates a current overscan in the sampling period, and the UPS nonlinear load current value is estimated according to the first current reconstruction equation and the second current reconstruction equation;
and in the sampling period, no current overscan occurs in the sampling current, and the original current value acquired by the current sensor is used as the UPS nonlinear load current value.
10. An electronic device, comprising:
one or more processors; and
storage means for storing one or more programs which when executed by the one or more processors cause the one or more processors to implement the method of any of claims 1-9.
11. A computer readable medium, on which a computer program is stored, characterized in that the program, when being executed by a processor, implements the method according to any one of claims 1-9.
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