CN112564117A - Voltage sag treatment method, voltage sag treatment device and terminal equipment - Google Patents

Voltage sag treatment method, voltage sag treatment device and terminal equipment Download PDF

Info

Publication number
CN112564117A
CN112564117A CN202011266947.9A CN202011266947A CN112564117A CN 112564117 A CN112564117 A CN 112564117A CN 202011266947 A CN202011266947 A CN 202011266947A CN 112564117 A CN112564117 A CN 112564117A
Authority
CN
China
Prior art keywords
voltage sag
active power
event
curve
voltage
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Granted
Application number
CN202011266947.9A
Other languages
Chinese (zh)
Other versions
CN112564117B (en
Inventor
胡翀
徐斌
胡世骏
王刘芳
高博
甄超
田宇
季坤
计长安
唐兴勇
王昕�
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
CEIEC ELECTRIC TECHNOLOGY Inc
Electric Power Research Institute of State Grid Anhui Electric Power Co Ltd
State Grid Anhui Electric Power Co Ltd
Original Assignee
CEIEC ELECTRIC TECHNOLOGY Inc
Electric Power Research Institute of State Grid Anhui Electric Power Co Ltd
State Grid Anhui Electric Power Co Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by CEIEC ELECTRIC TECHNOLOGY Inc, Electric Power Research Institute of State Grid Anhui Electric Power Co Ltd, State Grid Anhui Electric Power Co Ltd filed Critical CEIEC ELECTRIC TECHNOLOGY Inc
Priority to CN202011266947.9A priority Critical patent/CN112564117B/en
Publication of CN112564117A publication Critical patent/CN112564117A/en
Application granted granted Critical
Publication of CN112564117B publication Critical patent/CN112564117B/en
Active legal-status Critical Current
Anticipated expiration legal-status Critical

Links

Images

Classifications

    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
    • H02J3/00—Circuit arrangements for ac mains or ac distribution networks
    • H02J3/12—Circuit arrangements for ac mains or ac distribution networks for adjusting voltage in ac networks by changing a characteristic of the network load
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
    • H02J13/00—Circuit arrangements for providing remote indication of network conditions, e.g. an instantaneous record of the open or closed condition of each circuitbreaker in the network; Circuit arrangements for providing remote control of switching means in a power distribution network, e.g. switching in and out of current consumers by using a pulse code signal carried by the network
    • H02J13/00004—Circuit arrangements for providing remote indication of network conditions, e.g. an instantaneous record of the open or closed condition of each circuitbreaker in the network; Circuit arrangements for providing remote control of switching means in a power distribution network, e.g. switching in and out of current consumers by using a pulse code signal carried by the network characterised by the power network being locally controlled
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y04—INFORMATION OR COMMUNICATION TECHNOLOGIES HAVING AN IMPACT ON OTHER TECHNOLOGY AREAS
    • Y04S—SYSTEMS INTEGRATING TECHNOLOGIES RELATED TO POWER NETWORK OPERATION, COMMUNICATION OR INFORMATION TECHNOLOGIES FOR IMPROVING THE ELECTRICAL POWER GENERATION, TRANSMISSION, DISTRIBUTION, MANAGEMENT OR USAGE, i.e. SMART GRIDS
    • Y04S10/00—Systems supporting electrical power generation, transmission or distribution
    • Y04S10/16—Electric power substations
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y04—INFORMATION OR COMMUNICATION TECHNOLOGIES HAVING AN IMPACT ON OTHER TECHNOLOGY AREAS
    • Y04S—SYSTEMS INTEGRATING TECHNOLOGIES RELATED TO POWER NETWORK OPERATION, COMMUNICATION OR INFORMATION TECHNOLOGIES FOR IMPROVING THE ELECTRICAL POWER GENERATION, TRANSMISSION, DISTRIBUTION, MANAGEMENT OR USAGE, i.e. SMART GRIDS
    • Y04S20/00—Management or operation of end-user stationary applications or the last stages of power distribution; Controlling, monitoring or operating thereof
    • Y04S20/20—End-user application control systems
    • Y04S20/222—Demand response systems, e.g. load shedding, peak shaving

Abstract

The application is applicable to the technical field of power grids, and provides a voltage sag treatment method, a voltage sag treatment device, terminal equipment and a computer-readable storage medium, wherein the method comprises the following steps: acquiring monitoring data of a voltage sag event of a monitored target; obtaining an active power curve according to the monitoring data, wherein the active power curve is a curve of the active power of the monitored target changing with time in the process of the voltage sag event; and determining the composition information of the sensitive load accessed to the monitored target based on the active power curve so as to instruct a power supplier to manage the voltage sag according to the composition information. By the method, the composition of the sensitive load accessed to the transformer substation or the distribution feeder line can be analyzed, so that a decision basis is provided for a power supplier to manage the voltage sag.

Description

Voltage sag treatment method, voltage sag treatment device and terminal equipment
Technical Field
The application belongs to the technical field of power grids, and particularly relates to a voltage sag treatment method, a voltage sag treatment device, terminal equipment and a computer-readable storage medium.
Background
With the increasing role of high-end manufacturing industry in socio-economic development, governing voltage sag has become an important issue of current academic and industrial concerns. The voltage sag refers to a power supply disturbance event that the square mean root value of the power supply voltage suddenly drops to 90% -10% of a normal value and automatically recovers after 0.5 power frequency cycle wave lasts to 1min, and is difficult to avoid in the normal operation of a power grid. In industries represented by chip manufacturing, semiconductors, precision machining, power electronic device production, and the like, devices sensitive to power supply disturbances such as voltage sag and short-time voltage interruption are used in large quantities, and such devices are referred to as sensitive loads.
In recent years, in order to manage voltage sag and reduce user loss, a power supply party has taken many measures, but since the user information grasped by the power supply party is limited, the power supply party needs to analyze the sensitive load components accessed on a transformer substation or a distribution feeder line when providing high-quality power supply value-added service.
Disclosure of Invention
In view of this, the present application provides a voltage sag control method, a voltage sag control device, a terminal device, and a computer-readable storage medium, which can analyze the composition of a sensitive load connected to a substation or a distribution feeder, so as to provide a decision basis for a power supplier to control voltage sag.
In a first aspect, the present application provides a voltage sag management method, including:
acquiring monitoring data of a voltage sag event of a monitored target;
obtaining an active power curve according to the monitoring data, wherein the active power curve is a curve of active power of the monitored target changing with time in the process of the voltage sag event;
and determining the composition information of the sensitive load accessed to the monitored target based on the active power curve so as to instruct a power supplier to manage the voltage sag according to the composition information.
In a second aspect, the present application provides a voltage sag management device, comprising:
the data acquisition unit is used for acquiring monitoring data of a voltage sag event which occurs to a monitored target;
a curve obtaining unit, configured to obtain an active power curve according to the monitoring data, where the active power curve is a curve of active power of the monitored target changing with time in the process of the voltage sag event;
and the information determining unit is used for determining the composition information of the sensitive load accessed to the monitored target based on the active power curve so as to instruct a power supplier to manage the voltage sag according to the composition information.
In a third aspect, the present application provides a terminal device, comprising a memory, a processor and a computer program stored in the memory and executable on the processor, wherein the processor implements the method provided in the first aspect when executing the computer program.
In a fourth aspect, the present application provides a computer readable storage medium storing a computer program which, when executed by a processor, implements the method as provided in the first aspect.
In a fifth aspect, the present application provides a computer program product, which, when run on a terminal device, causes the terminal device to perform the method provided by the first aspect.
As can be seen from the above, in the present application, first, monitoring data of a voltage sag event occurring in a monitored target is obtained, then, an active power curve is obtained according to the monitoring data, where the active power curve is a curve of active power of the monitored target changing with time in the voltage sag event process, and finally, composition information of a sensitive load accessed to the monitored target is determined based on the active power curve, so as to instruct a power supplier to manage voltage sag according to the composition information. According to the scheme, different types of user loads are influenced differently by voltage sag, and the composition of sensitive loads accessed to the transformer substation or the distribution feeder is analyzed according to the active power change condition of the transformer substation or the distribution feeder in the voltage sag event process, so that a decision basis is provided for a power supplier to manage the voltage sag.
Drawings
In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings needed to be used in the embodiments or the prior art descriptions will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present application, and it is obvious for those skilled in the art to obtain other drawings without creative efforts.
FIG. 1 is a schematic flow chart of a voltage sag management method according to an embodiment of the present disclosure;
FIG. 2 is an exemplary graph of an active power curve provided by an embodiment of the present application;
FIG. 3 is an exemplary graph of a voltage sag tolerance curve provided by an embodiment of the present application;
FIG. 4 is a block diagram of a voltage sag management device according to an embodiment of the present disclosure;
fig. 5 is a schematic structural diagram of a terminal device according to an embodiment of the present application.
Detailed Description
In the following description, for purposes of explanation and not limitation, specific details are set forth, such as particular system structures, techniques, etc. in order to provide a thorough understanding of the embodiments of the present application. It will be apparent, however, to one skilled in the art that the present application may be practiced in other embodiments that depart from these specific details. In other instances, detailed descriptions of well-known systems, devices, circuits, and methods are omitted so as not to obscure the description of the present application with unnecessary detail.
It will be understood that the terms "comprises" and/or "comprising," when used in this specification and the appended claims, specify the presence of stated features, integers, steps, operations, elements, and/or components, but do not preclude the presence or addition of one or more other features, integers, steps, operations, elements, components, and/or groups thereof.
It should also be understood that the term "and/or" as used in this specification and the appended claims refers to and includes any and all possible combinations of one or more of the associated listed items.
As used in this specification and the appended claims, the term "if" may be interpreted contextually as "when", "upon" or "in response to" determining "or" in response to detecting ". Similarly, the phrase "if it is determined" or "if a [ described condition or event ] is detected" may be interpreted contextually to mean "upon determining" or "in response to determining" or "upon detecting [ described condition or event ]" or "in response to detecting [ described condition or event ]".
Furthermore, in the description of the present application and the appended claims, the terms "first," "second," "third," and the like are used for distinguishing between descriptions and not necessarily for describing or implying relative importance.
Reference throughout this specification to "one embodiment" or "some embodiments," or the like, means that a particular feature, structure, or characteristic described in connection with the embodiment is included in one or more embodiments of the present application. Thus, appearances of the phrases "in one embodiment," "in some embodiments," "in other embodiments," or the like, in various places throughout this specification are not necessarily all referring to the same embodiment, but rather "one or more but not all embodiments" unless specifically stated otherwise. The terms "comprising," "including," "having," and variations thereof mean "including, but not limited to," unless expressly specified otherwise.
Fig. 1 shows a flowchart of a voltage sag management method provided in an embodiment of the present application, which is detailed as follows:
step 101, acquiring monitoring data of a voltage sag event of a monitored target;
in this embodiment, the monitored target may be a substation or a distribution feeder, for example, if a voltage sag of a certain distribution feeder needs to be managed currently, the distribution feeder may be used as the monitored target. Specifically, the power supplier may configure a large number of power quality monitoring devices on the grid side, and then monitor the voltage sag event occurring on the distribution feeder through the power quality monitoring devices. The power quality monitoring device generates monitoring data of each voltage sag event, wherein the monitoring data may include, but is not limited to, voltage, current, frequency, phase, and the like. The terminal device can acquire the monitoring data of the voltage sag event which occurs to the power distribution feeder from the power quality monitoring device, for example, if the power distribution feeder has a voltage sag event yesterday, the terminal device can acquire the monitoring data of the voltage sag event yesterday from the power quality monitoring device.
102, obtaining an active power curve according to monitoring data;
in the embodiment of the application, the active power of the distribution feeder in the process of a certain voltage sag event can be calculated according to the acquired monitoring data of the certain voltage sag event occurring on the distribution feeder. According to the active power and the corresponding time, a curve of the active power changing along with the time can be generated, and the curve can be recorded as an active power curve. Referring to fig. 2, fig. 2 is an example of an active power curve, wherein an abscissa of the active power curve is time and an ordinate of the active power curve is active power.
Optionally, the monitoring data may include voltage transients at various times and current transients at various times during the corresponding voltage sag event for the distribution feeder. Based on this, the step 102 specifically includes:
extracting power frequency components in the voltage instantaneous value and power frequency components in the current instantaneous value to obtain voltage power frequency components and current power frequency components;
and obtaining an active power curve of the corresponding voltage sag event according to the voltage power frequency component and the current power frequency component.
In the embodiment of the present application, since the monitoring data recorded by the power quality monitoring device is the superposition of the power frequency component and the harmonic component, the power frequency components in the voltage instantaneous value and the current instantaneous value need to be extracted. Specifically, for the voltage instantaneous value at each moment in the voltage sag event process, discrete fourier transform can be performed on the voltage instantaneous value to obtain a voltage power frequency component at the moment; similarly, for the current instantaneous value at each moment in the voltage sag event process, discrete fourier transform can be performed on the current instantaneous value to obtain the current power frequency component at the moment. In the process of obtaining the voltage sag event, after the voltage power frequency component and the current power frequency component at each moment are obtained, the voltage power frequency component and the current power frequency component at the same moment can be multiplied, and the obtained product is the active power at the same moment. And after the active power at each moment in the voltage sag event process is obtained, an active power curve can be generated. It should be noted that the voltage sag is divided into a three-phase symmetric sag and a three-phase asymmetric sag. When three-phase asymmetric sag occurs, the user load is mainly influenced by the deepest phase of the sag depth, so that the voltage instantaneous value in the embodiment of the application is actually the voltage instantaneous value of the deepest phase of the sag depth; when three-phase symmetric sag occurs, the instantaneous voltage value in the embodiment of the present application may be the instantaneous voltage value of any one of the three phases.
Optionally, before generating the active power curve, in order to suppress the fluctuation of the power system and the influence of noise, an Empirical Mode Decomposition (EMD) may be further used to preprocess the active power at each time during the voltage sag event, so as to achieve the effect of signal noise reduction. Finally, an active power curve may be generated from the denoised active power. The EMD pretreatment process comprises the following steps:
(1) for a group of active power, obtaining the local maximum and local minimum according to cubic spline interpolation, determining the upper envelope and the lower envelope according to the local maximum and local minimum, and using m1Means representing upper and lower envelopes;
(2) subtracting m from the active power P (t)1Obtaining a first component h1：h1＝P(t)–m1T represents time;
(3) the first screening process is completed by the above steps (1) and (2), and in the second screening process, h1Considered as data after screening, m1,1Is h1Average of upper and lower envelopes of (1): h is1,1＝h1–m1,1；
(4) The screening process was repeated k times until h1,kIs an intrinsic mode function, namely: h is1,(k-1)–m1,k＝h1,k。
(5) Defining the first eigenmode Function (IMF) component after decomposition as c1＝h1,kI.e. the active power after noise reduction.
And 103, determining the composition information of the sensitive load accessed to the monitored target based on the active power curve so as to instruct a power supplier to manage the voltage sag according to the composition information.
In the embodiment of the application, a plurality of user loads can be accessed on the distribution feeder, and a plurality of sensitive loads can be included in the plurality of user loads. In actual work, if the voltage sag needs to be managed, the composition information of the sensitive load needs to be acquired first. The composition information includes, but is not limited to, the percentage of sensitive loads in the user loads, the percentage of various types of sensitive loads in the user loads, and the percentage of various types of sensitive loads in the user loads that are affected by the voltage sag to different degrees. The active power curve reflects the change condition of the active power of the power distribution feeder line in the corresponding voltage sag event process, and the composition information can be analyzed according to the change condition. The power supplier can take corresponding measures to control the voltage sag according to the composition information.
Optionally, the step 103 specifically includes:
a1, determining a mutation point on an active power curve;
and A2, determining composition information according to the mutation points.
The active power curve reflects the change condition of the active power of the distribution feeder in the corresponding voltage sag event process, and therefore, based on the characteristics of the voltage sag, the active power curve includes five stages, specifically referring to fig. 2, and the active power curve includes an event front section, a transition section 1 (i.e., an active power descending section), an event duration section, a transition section 2 (i.e., an active power ascending section), and a voltage recovery section. In the embodiment of the present application, a discontinuity point, i.e., an inflection point, on the active power curve may be determined. Wherein, the mutation point can comprise a descending initial point, a descending end point and an ascending end point. The starting point of the decrease is the starting point of the active power decreasing segment, such as the point (t) in fig. 21，P1) I.e. the time corresponding to the point of the descent onset is t1Corresponding active power is P1(ii) a The end point of the falling, i.e. the end point of the active power falling section, such as the point (t) in fig. 22，P2) I.e. the time corresponding to the end point of the descent is t2Corresponding active power ofP2(ii) a The end point of the rising, i.e. the end point of the active power rising section, such as the point (t) in fig. 24，P4) I.e. the time corresponding to the end point of the rise is t4Corresponding active power is P4。
In order to determine the abrupt change point, an active power falling segment and an active power rising segment need to be found in an active power curve. In the embodiment of the application, an active power descending section and an active power ascending section can be found out by using Hilbert conversion. Specifically, the hilbert transform of the active power p (t) after noise reduction can be represented as a convolution of p (t) and 1/π t, as shown in the following formula, and the transformed signal is used
Figure BDA0002776426440000071
Represents:
Figure BDA0002776426440000072
wherein the Fourier transform of 1/π t is-jsgn (ω), sgn (ω) being a sign function defined by the following equation:
Figure BDA0002776426440000073
taking P (t) as the real part of the constructed signal, the transformed signal
Figure BDA0002776426440000074
As an imaginary part, a structural signal z (t), i.e. an analytic signal of p (t), is formed. The modulus of the constructed signal Z (t) is the envelope of P (t). And determining an active power descending section and an active power ascending section according to the obtained envelope of P (t).
Optionally, the step a2 specifically includes:
determining the proportion of sensitive loads in user loads accessed to a monitored target according to the active power corresponding to the descending starting point and the active power corresponding to the descending terminating point;
determining the proportion of a first sensitive load in user loads accessed to a monitored target according to the active power corresponding to the descending starting point and the active power corresponding to the ascending terminating point;
and determining the occupation ratio of a second sensitive load in the user loads accessed to the monitored target according to the active power corresponding to the descending starting point, the active power corresponding to the descending terminating point and the active power corresponding to the ascending terminating point.
In the embodiment of the application, because the sensitive load on the distribution feeder line can trip or be switched to a management device when a voltage sag event occurs, the proportion of the sensitive load in the user load accessed on the distribution feeder line can be determined according to the active power corresponding to the descent starting point and the active power corresponding to the descent ending point. As shown in fig. 2, when a voltage sag event occurs, the active power of the distribution feeder corresponds to the active power P from the beginning point of the sag1Decrease to active power P corresponding to the drop termination point2The proportion of the sensitive load among the subscriber loads connected to the distribution feeder is then PSL：
Figure BDA0002776426440000081
Wherein, | P2|/P1The duty ratio of the user load which is not influenced by the voltage sag.
After the voltage sag is finished, in all the sensitive loads accessed to the distribution feeder line, the active power of part of the sensitive loads can be automatically recovered, and the active power of the other part of the sensitive loads cannot be automatically recovered, so that the active power P corresponding to the rising termination point can be known4Active power P not equal to corresponding falling starting point1. Then, the proportion of the user loads (including the sensitive loads whose active power can be automatically recovered after the voltage sag and the non-sensitive loads that are not affected by the voltage sag) that normally operate after the voltage sag is over is | P4|/P1And recording the sensitive load of which the active power cannot be automatically recovered after the voltage sag as a first sensitive load, wherein the proportion of the first sensitive load in the user loads accessed to the distribution feeder line is PNAR：
Figure BDA0002776426440000082
Recording the sensitive load with the active power capable of being automatically recovered after the voltage sag as a second sensitive load, wherein the proportion of the second sensitive load in the user loads accessed to the distribution feeder line is PAR：
Figure BDA0002776426440000083
Proportion P of sensitive load in user load accessed on distribution feederSLThe proportion P of the first sensitive load in the user loads accessed on the distribution feederNARAnd the proportion P of the second sensitive load in the user loads accessed on the distribution feederARThe three satisfy the following relational expression:
PSL＝PNAR+PAR
upon calculation to obtain PSL、PARAnd PNARAnd then, the composition characteristics of the user load accessed on the distribution feeder line and the influence degree of the user load by the voltage sag can be analyzed. Exemplarily, if PSLIf the voltage sag does not affect the user load, the user load is determined to be not sensitive, and the influence degree of the voltage sag on the user load is not large; if P isNARIs equal to 0, and PSL＝PARSensitive loads exist in user loads accessed to the distribution feeder line, the active power of the sensitive loads can be automatically recovered after the voltage sag is finished, and the influence degree of the voltage sag on the user loads is not large; if P isSL＝PNAR+PARAnd P isSLNot equal to 0, and PNARNot equal to 0, sensitive loads can be determined to exist in user loads accessed on the distribution feeder line, and active power of part of the sensitive loads can be automatically recovered when the voltage sag is finished; if P isAR＝0,PSL＝PNARThen it can be determined that there are sensitive loads among the subscriber loads accessed on the distribution feeder and that these are sensitiveAfter the voltage sag is finished, the active power of the inductive load cannot be automatically recovered, and the influence of the voltage sag on the load of a user is large.
Optionally, the step a2 may further specifically include:
a21, acquiring a voltage sag tolerance curve of at least one preset sensitive load;
a22, determining the occupation ratio of various preset sensitive loads in the user loads accessed to the monitored target according to the voltage sag tolerance curve and the catastrophe points corresponding to the N times of voltage sag events, wherein N is a positive integer.
In the embodiment of the present application, a power supplier may investigate the types of sensitive loads used by users (e.g., a semiconductor enterprise, a paper mill, etc.), for example, the sensitive loads used by the users include four sensitive loads, i.e., an AC-contactor (ACC), an Adjustable Speed Drive (ASD), a Personal Computer (PC), and a Programmable Logic Controller (PLC), and the four sensitive loads may be used as preset sensitive loads. The terminal device can obtain voltage sag tolerance curves of various preset sensitive loads, wherein for the voltage sag tolerance curves of various preset sensitive loads, the industry already has a lot of research data, and the terminal device can directly download the research data from the internet, so that the voltage sag tolerance curves can be obtained.
It should be noted that, in the embodiment of the present application, it is required to obtain monitoring data of N voltage sag events that have occurred on a distribution feeder, generate N active power curves according to the monitoring data of the N voltage sag events, and determine respective corresponding abrupt change points of the N active power curves based on the above manner of determining the abrupt change points. Wherein, the size of N depends on the variation of each voltage sag tolerance curve. For example, assuming that the sensitive loads used by the user include ACC, ASD, PC and PLC, the voltage sag tolerance curves of these four sensitive loads are shown in fig. 3, and the region between the voltage sag tolerance curve and the horizontal axis may be referred to as a danger zone of the voltage sag tolerance curve, and if the sag amplitude and duration of a certain voltage sag fall into the danger zone, it indicates that the sensitive load corresponding to the voltage sag tolerance curve may malfunction (i.e., trip or interrupt) in the certain voltage sag. According to the overlapping condition of the danger zones of the four voltage sag tolerance curves, the danger zone can be divided into six zones which are represented by I-VI. According to the dip amplitude and duration of the voltage dip, which partition of six partitions the voltage dip falls into can be determined, and when the voltage dip falls into different partitions, the sensitive load connected to the distribution feeder shows different states in the voltage dip, wherein the states include normal operation and fault. Assuming x represents a fault and o represents normal operation, the following table can be obtained:
Figure BDA0002776426440000101
for example, assuming that the sag amplitude of the 1 st voltage sag occurring on the distribution feeder is 40% and the duration is 49ms, that is, the 1 st voltage sag falls into the partition I, according to the above table, it can be known that the ACC fails in the 1 st voltage sag, and the ASD, PC and PLC operate normally in the 1 st voltage sag. In this example, the number of partitions is 6, so N should be greater than or equal to 6, that is, the mutation points corresponding to 6 voltage sag events are obtained, and the 6 voltage sags fall into partitions I to VI, respectively.
And finally, determining the occupation ratio of various preset sensitive loads in the user loads accessed to the monitored target according to the voltage sag tolerance curve and the catastrophe points corresponding to the N times of voltage sag events.
Optionally, after step 101, the method further includes:
and obtaining event information of the corresponding voltage sag event according to the monitoring data, wherein the event information comprises a sag amplitude and a duration.
Correspondingly, the step a22 specifically includes:
a221, determining load condition information of the voltage sag events for N times according to the event information of the voltage sag events for N times and the voltage sag tolerance curve;
and A222, determining the occupation ratio of various preset sensitive loads in the user loads accessed to the monitored target according to the load condition information of the voltage sag events for N times and the catastrophe points corresponding to the voltage sag events for N times.
In the embodiment of the present application, load condition information of each voltage sag event can be determined according to the event information of the voltage sag event and the voltage sag tolerance curve, where the load condition information indicates whether various preset sensitive loads have faults in the voltage sag event.
Illustratively, assuming the preset sensitive loads include ACC, ASD, PC and PLC, the voltage dip of the 1 st voltage dip on the distribution feeder is 40% in magnitude and 49ms in duration, i.e., the 1 st voltage dip falls into partition I in fig. 3. As can be seen from the above table, the ACC fails in the 1 st voltage sag, and the ASD, PC and PLC operate normally in the 1 st voltage sag, that is, the load condition information of the 1 st voltage sag event indicates that the ACC fails in the 1 st voltage sag, and the ASD, PC and PLC operate normally in the 1 st voltage sag.
And finally, determining the occupation ratio of various preset sensitive loads in the user loads accessed to the distribution feeder line according to the load condition information of the voltage sag events for N times and the catastrophe points corresponding to the voltage sag events for N times.
Optionally, the step a222 specifically includes:
calculating the absolute value of the difference value of the active power corresponding to the descending starting point corresponding to the voltage sag event and the ascending ending point corresponding to the voltage sag event;
based on the load condition information, taking the ratio of the absolute value to the active power corresponding to the drop starting point corresponding to the voltage sag event as the proportion of the sensitive load with faults in the user load accessed to the monitored target in the voltage sag event;
and obtaining the occupation ratios of various preset sensitive loads in the user loads accessed to the monitored target according to the occupation ratios of the sensitive loads with faults corresponding to the N voltage sag events.
In this embodiment, for each voltage sag event of the N voltage sag events, an absolute value of a difference between an active power corresponding to a falling start point corresponding to the voltage sag event and an active power corresponding to a rising end point corresponding to the voltage sag event may be calculated, for example, if the active power corresponding to the falling start point corresponding to the voltage sag event is 80, and the active power corresponding to the rising end point corresponding to the voltage sag event is 70, the absolute value is equal to |80-70| — 10. Based on the load condition information of the voltage sag event, it can be obtained whether various preset sensitive devices have faults in the voltage sag event, for example, ACC and ASD have faults, and PC and PLC both operate normally, so that in the voltage sag event, the proportion of the sensitive loads having faults in the user loads connected to the distribution feeder, that is, the total proportion of ACC and ASD in the user loads, is the proportion of the sensitive loads having faults.
After the occupation ratios of the sensitive loads with faults corresponding to the N times of voltage sag events are obtained, the occupation ratios of various preset sensitive loads in the user loads accessed to the distribution feeder line can be calculated. For example, the sensitive loads that have failed in the 1 st voltage sag event include ACC and ASD, and the proportion of the sensitive loads that have failed is 50%; the sensitive load with the fault in the 2 nd voltage sag event includes PC, ACC, and ASD, the proportion of the sensitive load with the fault is 70%, and since the total proportion of ACC and ASD in the customer load is 50% and the total proportion of PC, ACC, and ASD in the customer load is 70%, the proportion of PC in the customer load can be calculated to be 70% -50% — 20%.
For example, if the preset sensitive loads include ACC, ASD, PC and PLC, referring to fig. 3, if the ith voltage sag event falls into the partition I, the sensitive load with the fault in the ith voltage sag event includes ACC, and then the occupancy ratio of the ACC connected to the distribution feeder is PACC,i：
Figure BDA0002776426440000121
Wherein, P1，iActive power, P, corresponding to the drop onset point corresponding to the ith voltage sag event4，iCorresponding to a rising end point for the ith voltage sag eventActive power.
If the ith voltage sag event falls into the partition II, the sensitive load with the fault in the ith voltage sag event comprises an ASD (active switching device), and the proportion of the ASD connected to the distribution feeder line is PASD,i：
Figure BDA0002776426440000122
Wherein, P1，iActive power, P, corresponding to the drop onset point corresponding to the ith voltage sag event4，iAnd the active power corresponding to the rising termination point corresponding to the ith voltage sag event.
If the jth voltage sag event falls into the partition III, the sensitive loads with faults in the jth voltage sag event comprise ACC and ASD, and the ratio of the ACC to the ASD accessed on the distribution feeder line is PASD-ACC,j：
Figure BDA0002776426440000123
Wherein, P1，jActive power, P, corresponding to the drop onset point corresponding to the jth voltage sag event4，jAnd the active power corresponding to the rising termination point corresponding to the jth voltage sag event.
If the kth voltage sag event falls into the partition IV, the sensitive loads with faults in the kth voltage sag event comprise ACC, ASD and PC, and the ratio of the ACC, the ASD and the PC accessed to the distribution feeder line can be obtained as PASD-ACC-PC,k：
Figure BDA0002776426440000131
Wherein, P1，kActive power, P, corresponding to the point of the droop onset corresponding to the kth voltage sag event4，kAnd the active power corresponding to the rising termination point corresponding to the kth voltage sag event.
If the mth voltage sag event falls into the partition V, the sensitive loads with faults in the mth voltage sag event comprise ACC, ASD and PLC, and the ratio of the ACC, the ASD and the PLC accessed to the distribution feeder line can be obtained as PASD-ACC-PLC,m：
Figure BDA0002776426440000132
Wherein, P1，mActive power, P, corresponding to the point of the droop onset corresponding to the mth voltage sag event4，mAnd the active power corresponding to the rising termination point corresponding to the mth voltage sag event.
If the nth voltage sag event falls into the partition VI, the sensitive loads with faults in the nth voltage sag event comprise ACC, ASD, PC and PLC, and the proportion of the ACC, the ASD, the PC and the PLC accessed to the distribution feeder line can be obtained as PASD-ACC-PC-PLC,n：
Figure BDA0002776426440000133
Wherein, P1，nActive power, P, corresponding to the drop starting point corresponding to the nth voltage sag event4，nAnd the active power corresponding to the rising termination point corresponding to the nth voltage sag event.
In summary, the percentage P of PC in the customer load connected to the distribution feeder can be foundPC,k＝PASD-ACC-PC,k-PASD-ACC,jPercentage of PLC in customer load connected to distribution feeder PPLC,m＝PASD-ACC-PLC,m-PASD-ACC,jRatio P of ASD in subscriber load connected to distribution feederASD,i＝PASD-ACC,j-PACC,iACC occupancy P in customer load access to distribution feederACC,i＝PASD-ACC,j-PASD,i. Thus, the proportion of various preset sensitive loads in the user loads accessed on the distribution feeder is obtained.
As a possible implementation manner, in order to improve the accuracy of the calculated ratio, the N voltage sag events may include that a voltage sag events fall into the partition I in fig. 3, b voltage sag events fall into the partition II in fig. 3, c voltage sag events fall into the partition III in fig. 3, d voltage sag events fall into the partition IV in fig. 3, e voltage sag events fall into the partition V in fig. 3, f voltage sag events fall into the partition VI in fig. 3, and a, b, c, d, e, and f are integers greater than 1. Based on this, for the preset sensitive load of the same type, a plurality of ratios may be calculated, in the embodiment of the present application, an average value of the plurality of ratios is taken as the ratio of the preset sensitive load of the same type, and the formula is expressed as follows:
Figure BDA0002776426440000141
Figure BDA0002776426440000142
Figure BDA0002776426440000143
Figure BDA0002776426440000144
wherein, PACCAverage value of ACC in user load for access to distribution feeder, PASDFor averaging the ratio of ASD in the subscriber load connected to the distribution feeder, PPCFor average value of PC's duty ratio in subscriber load connected to distribution feeder, PPLCMin (·, · s) represents taking the minimum of the two, as the average of the PLC's duty ratio in the customer load accessing the distribution feeder. The subscripts i, k, m represent the ith, k, m voltage sags, respectively.
As can be seen from the above, in the present application, first, monitoring data of a voltage sag event occurring in a monitored target is obtained, then, an active power curve is obtained according to the monitoring data, where the active power curve is a curve of active power of the monitored target changing with time in the voltage sag event process, and finally, composition information of a sensitive load accessed to the monitored target is determined based on the active power curve, so as to instruct a power supplier to manage voltage sag according to the composition information. According to the scheme, different types of user loads are influenced differently by voltage sag, and the composition of sensitive loads accessed to the transformer substation or the distribution feeder is analyzed according to the active power change condition of the transformer substation or the distribution feeder in the voltage sag event process, so that a decision basis is provided for a power supplier to manage the voltage sag.
It should be understood that, the sequence numbers of the steps in the foregoing embodiments do not imply an execution sequence, and the execution sequence of each process should be determined by its function and inherent logic, and should not constitute any limitation to the implementation process of the embodiments of the present application.
Fig. 4 shows a block diagram of a voltage sag management device according to an embodiment of the present application, and for convenience of description, only a part related to the embodiment of the present application is shown.
This voltage sag control device 400 includes:
a data obtaining unit 401, configured to obtain monitoring data of a voltage sag event that has occurred in a monitored target;
a curve obtaining unit 402, configured to obtain an active power curve according to the monitoring data, where the active power curve is a curve of active power of the monitored target changing with time in the process of the voltage sag event;
an information determining unit 403, configured to determine, based on the active power curve, composition information of a sensitive load accessed to the monitored target, so as to instruct a power supplier to manage a voltage sag according to the composition information.
Optionally, the information determining unit 403 includes:
a discontinuity point determining subunit, configured to determine a discontinuity point on the active power curve, where the discontinuity point includes a descending starting point, a descending ending point, and a ascending ending point, where the descending starting point is a starting point of an active power descending section, the descending ending point is an ending point of the active power descending section, and the ascending ending point is an ending point of an active power ascending section;
and the composition information determining subunit is used for determining the composition information according to the mutation points.
Optionally, the composition information determining subunit includes:
a first proportion determining subunit, configured to determine, according to the active power corresponding to the drop starting point and the active power corresponding to the drop terminating point, a proportion of a sensitive load in user loads accessed to the monitored target;
a second proportion determining subunit, configured to determine, according to the active power corresponding to the drop starting point and the active power corresponding to the rise terminating point, a proportion of a first sensitive load in user loads accessed to the monitored target, where the first sensitive load is a sensitive load whose active power cannot be recovered after the voltage sag event;
and a third proportion determining subunit, configured to determine, according to the active power corresponding to the drop starting point, the active power corresponding to the drop terminating point, and the active power corresponding to the rise terminating point, a proportion of a second sensitive load in the user loads accessed to the monitored target, where the second sensitive load is a sensitive load for which the active power can be recovered after the voltage sag event.
Optionally, the composition information determining subunit further includes:
the curve acquisition subunit is used for acquiring a voltage sag tolerance curve of at least one preset sensitive load;
and the sensitive occupancy determining subunit is configured to determine occupancy of various preset sensitive loads in the user loads accessed to the monitored target according to the voltage sag tolerance curve and the catastrophe points corresponding to the voltage sag events for N times, where N is a positive integer.
Optionally, the voltage sag management device 400 further includes:
and the time information acquisition unit is used for acquiring the event information of the corresponding voltage sag event according to the monitoring data, wherein the event information comprises a sag amplitude value and a duration.
Optionally, the sensitivity ratio determining subunit includes:
a load information determining subunit, configured to determine load condition information of the voltage sag events for N times according to event information of the voltage sag events for N times and the voltage sag tolerance curve, where the load condition information is used to indicate whether a fault occurs in a corresponding voltage sag event for each preset sensitive load;
and the sensitive load ratio determining subunit is configured to determine, according to the load condition information of the voltage sag event for N times and the catastrophe points corresponding to the voltage sag events for N times, the ratio of various preset sensitive loads in the user loads accessed to the monitored target.
Optionally, the sensitive duty ratio determining subunit includes:
an absolute value operator unit, configured to calculate an absolute value of a difference between active power corresponding to a falling start point corresponding to the voltage sag event and an increasing end point corresponding to the voltage sag event;
a ratio operator unit, configured to use, based on the load condition information, a ratio of the absolute value to an active power corresponding to a drop starting point corresponding to the voltage sag event as a ratio of a sensitive load with a fault in a user load accessed to the monitored target in the voltage sag event;
and the preset sensitive load ratio calculating subunit is used for obtaining the ratio of various preset sensitive loads in the user loads accessed to the monitored target according to the ratio of the sensitive loads with faults corresponding to the voltage sag events for N times.
Optionally, the monitoring data includes a voltage instantaneous value and a current instantaneous value of the monitored target at each time during a corresponding voltage sag event, and the curve obtaining unit 402 includes:
the component extraction subunit is used for extracting a power frequency component in the voltage instantaneous value and a power frequency component in the current instantaneous value to obtain a voltage power frequency component and a current power frequency component;
a curve obtaining subunit, configured to obtain an active power curve of the corresponding voltage sag event according to the voltage power frequency component and the current power frequency component
As can be seen from the above, in the present application, first, monitoring data of a voltage sag event occurring in a monitored target is obtained, then, an active power curve is obtained according to the monitoring data, where the active power curve is a curve of active power of the monitored target changing with time in the voltage sag event process, and finally, composition information of a sensitive load accessed to the monitored target is determined based on the active power curve, so as to instruct a power supplier to manage voltage sag according to the composition information. According to the scheme, different types of user loads are influenced differently by voltage sag, and the composition of sensitive loads accessed to the transformer substation or the distribution feeder is analyzed according to the active power change condition of the transformer substation or the distribution feeder in the voltage sag event process, so that a decision basis is provided for a power supplier to manage the voltage sag.
Fig. 5 is a schematic structural diagram of a terminal device according to an embodiment of the present application. As shown in fig. 5, the terminal device 5 of this embodiment includes: at least one processor 50 (only one is shown in fig. 5), a memory 51, and a computer program 52 stored in the memory 51 and executable on the at least one processor 50, wherein the processor 50 executes the computer program 52 to implement the following steps:
acquiring monitoring data of a voltage sag event of a monitored target;
obtaining an active power curve according to the monitoring data, wherein the active power curve is a curve of active power of the monitored target changing with time in the process of the voltage sag event;
and determining the composition information of the sensitive load accessed to the monitored target based on the active power curve so as to instruct a power supplier to manage the voltage sag according to the composition information.
In a second possible implementation manner provided on the basis of the first possible implementation manner, the determining, based on the active power curve, composition information of a sensitive load accessed to the monitored target includes:
determining a discontinuity point on the active power curve, wherein the discontinuity point comprises a descending initial point, a descending end point and an ascending end point, the descending initial point is an initial point of an active power descending section, the descending end point is an end point of the active power descending section, and the ascending end point is an end point of an active power ascending section;
and determining the composition information according to the mutation points.
In a third possible embodiment based on the second possible embodiment, the determining the composition information based on the mutation point includes:
determining the proportion of sensitive loads in user loads accessed to the monitored target according to the active power corresponding to the descending starting point and the active power corresponding to the descending terminating point;
determining the proportion of a first sensitive load in user loads accessed to the monitored target according to the active power corresponding to the descending starting point and the active power corresponding to the ascending terminating point, wherein the first sensitive load is a sensitive load of which the active power cannot be recovered after the voltage sag event;
and determining the proportion of a second sensitive load in the user loads accessed to the monitored target according to the active power corresponding to the descending starting point, the active power corresponding to the descending terminating point and the active power corresponding to the ascending terminating point, wherein the second sensitive load is a sensitive load which can be recovered by the active power after the voltage sag event.
In a fourth possible embodiment based on the second possible embodiment, the determining the composition information according to the mutation point includes:
obtaining a voltage sag tolerance curve of at least one preset sensitive load;
and determining the occupation ratio of various preset sensitive loads in the user loads accessed to the monitored target according to the voltage sag tolerance curve and the catastrophe points corresponding to the voltage sag events for N times, wherein N is a positive integer.
In a fifth possible implementation manner provided as the basis of the fourth possible implementation manner, after the obtaining of the monitoring data of the voltage sag event occurring in the monitored object, the processor 50 executes the computer program 52 to further implement the following steps:
obtaining event information of a corresponding voltage sag event according to the monitoring data, wherein the event information comprises a sag amplitude and a duration;
correspondingly, the determining the percentage of various preset sensitive loads in the user loads accessed to the monitored target according to the voltage sag tolerance curve and the catastrophe points corresponding to the voltage sag events for N times includes:
determining load condition information of the voltage sag events for N times according to the event information of the voltage sag events for N times and the voltage sag tolerance curve, wherein the load condition information is used for indicating whether various preset sensitive loads have faults in the corresponding voltage sag events;
and determining the occupation ratio of various preset sensitive loads in the user loads accessed to the monitored target according to the load condition information of the voltage sag events for N times and the catastrophe points corresponding to the voltage sag events for N times.
In a sixth possible implementation manner provided based on the fifth possible implementation manner, the determining, according to the load condition information of the voltage sag event for N times and the catastrophe point corresponding to the voltage sag event for N times, the percentage of various preset sensitive loads among the user loads accessed to the monitored target includes:
calculating the absolute value of the difference value of the active power corresponding to the descending starting point corresponding to the voltage sag event and the ascending ending point corresponding to the voltage sag event;
based on the load condition information, taking the ratio of the absolute value to the active power corresponding to the drop starting point corresponding to the voltage sag event as the proportion of the sensitive load with a fault in the user load accessed to the monitored target in the voltage sag event;
and obtaining the occupation ratios of various preset sensitive loads in the user loads accessed to the monitored target according to the occupation ratios of the sensitive loads with faults corresponding to the voltage sag events for N times.
In a seventh possible implementation manner provided based on the first possible implementation manner, the obtaining an active power curve according to the monitoring data includes:
extracting power frequency components in the voltage instantaneous value and power frequency components in the current instantaneous value to obtain voltage power frequency components and current power frequency components;
and obtaining an active power curve of the corresponding voltage sag event according to the voltage power frequency component and the current power frequency component.
The terminal device 5 may be a desktop computer, a notebook, a palm computer, a cloud server, or other computing devices. The terminal device may include, but is not limited to, a processor 50, a memory 51. Those skilled in the art will appreciate that fig. 5 is only an example of the terminal device 5, and does not constitute a limitation to the terminal device 5, and may include more or less components than those shown, or combine some components, or different components, such as an input-output device, a network access device, and the like.
The Processor 50 may be a Central Processing Unit (CPU), and the Processor 50 may be other general purpose Processor, a Digital Signal Processor (DSP), an Application Specific Integrated Circuit (ASIC), an off-the-shelf Programmable Gate Array (FPGA) or other Programmable logic device, discrete Gate or transistor logic device, discrete hardware component, etc. A general purpose processor may be a microprocessor or the processor may be any conventional processor or the like.
The storage 51 may be an internal storage unit of the terminal device 5, such as a hard disk or a memory of the terminal device 5. In other embodiments, the memory 51 may also be an external storage device of the terminal device 5, such as a plug-in hard disk, a Smart Media Card (SMC), a Secure Digital (SD) Card, a Flash memory Card (Flash Card), and the like, which are provided on the terminal device 5. Further, the memory 51 may include both an internal storage unit and an external storage device of the terminal device 5. The memory 51 is used for storing an operating system, an application program, a BootLoader (BootLoader), data, other programs, and the like, such as program codes of the computer programs. The above-mentioned memory 51 may also be used to temporarily store data that has been output or is to be output.
As can be seen from the above, in the present application, first, monitoring data of a voltage sag event occurring in a monitored target is obtained, then, an active power curve is obtained according to the monitoring data, where the active power curve is a curve of active power of the monitored target changing with time in the voltage sag event process, and finally, composition information of a sensitive load accessed to the monitored target is determined based on the active power curve, so as to instruct a power supplier to manage voltage sag according to the composition information. According to the scheme, different types of user loads are influenced differently by voltage sag, and the composition of sensitive loads accessed to the transformer substation or the distribution feeder is analyzed according to the active power change condition of the transformer substation or the distribution feeder in the voltage sag event process, so that a decision basis is provided for a power supplier to manage the voltage sag.
It should be noted that, for the information interaction, execution process, and other contents between the above-mentioned devices/units, the specific functions and technical effects thereof are based on the same concept as those of the embodiment of the method of the present application, and specific reference may be made to the part of the embodiment of the method, which is not described herein again.
It will be apparent to those skilled in the art that, for convenience and brevity of description, only the above-mentioned division of the functional units and modules is illustrated, and in practical applications, the above-mentioned functions may be distributed as different functional units and modules according to needs, that is, the internal structure of the apparatus may be divided into different functional units or modules to implement all or part of the above-mentioned functions. Each functional unit and module in the embodiments may be integrated in one processing unit, or each unit may exist alone physically, or two or more units are integrated in one unit, and the integrated unit may be implemented in a form of hardware, or in a form of software functional unit. In addition, specific names of the functional units and modules are only for convenience of distinguishing from each other, and are not used for limiting the protection scope of the present application. The specific working processes of the units and modules in the system may refer to the corresponding processes in the foregoing method embodiments, and are not described herein again.
The embodiments of the present application further provide a computer-readable storage medium, where a computer program is stored, and the computer program, when executed by a processor, implements the steps in the above method embodiments.
Embodiments of the present application provide a computer program product, which, when running on a terminal device, causes the terminal device to execute the steps in the above-mentioned method embodiments.
The integrated unit may be stored in a computer-readable storage medium if it is implemented in the form of a software functional unit and sold or used as a separate product. Based on such understanding, all or part of the processes in the methods of the embodiments described above can be implemented by a computer program, which can be stored in a computer-readable storage medium and can implement the steps of the embodiments of the methods described above when the computer program is executed by a processor. The computer program includes computer program code, and the computer program code may be in a source code form, an object code form, an executable file or some intermediate form. The computer-readable medium may include at least: any entity or apparatus capable of carrying computer program code to a terminal device, recording medium, computer Memory, Read-Only Memory (ROM), Random-Access Memory (RAM), electrical carrier wave signals, telecommunications signals, and software distribution medium. Such as a usb-disk, a removable hard disk, a magnetic or optical disk, etc. In certain jurisdictions, computer-readable media may not be an electrical carrier signal or a telecommunications signal in accordance with legislative and patent practice.
In the above embodiments, the descriptions of the respective embodiments have respective emphasis, and reference may be made to the related descriptions of other embodiments for parts that are not described or illustrated in a certain embodiment.
Those of ordinary skill in the art will appreciate that the various illustrative elements and algorithm steps described in connection with the embodiments disclosed herein may be implemented as electronic hardware or combinations of computer software and electronic hardware. Whether such functionality is implemented as hardware or software depends upon the particular application and design constraints imposed on the implementation. Skilled artisans may implement the described functionality in varying ways for each particular application, but such implementation decisions should not be interpreted as causing a departure from the scope of the present application.
In the embodiments provided in the present application, it should be understood that the disclosed apparatus/network device and method may be implemented in other ways. For example, the above-described apparatus/network device embodiments are merely illustrative, and for example, the division of the above modules or units is only one logical function division, and there may be other divisions when actually implemented, for example, a plurality of units or components may be combined or integrated into another system, or some features may be omitted, or not executed. In addition, the shown or discussed mutual coupling or direct coupling or communication connection may be an indirect coupling or communication connection through some interfaces, devices or units, and may be in an electrical, mechanical or other form.
The units described as separate parts may or may not be physically separate, and parts displayed as units may or may not be physical units, may be located in one place, or may be distributed on a plurality of network units. Some or all of the units can be selected according to actual needs to achieve the purpose of the solution of the embodiment.
The above embodiments are only used to illustrate the technical solutions of the present application, and not to limit the same; although the present application has been described in detail with reference to the foregoing embodiments, it should be understood by those of ordinary skill in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; such modifications and substitutions do not substantially depart from the spirit and scope of the embodiments of the present application and are intended to be included within the scope of the present application.

Claims (10)

1. A voltage sag management method is characterized by comprising the following steps:
acquiring monitoring data of a voltage sag event of a monitored target;
obtaining an active power curve according to the monitoring data, wherein the active power curve is a curve of the active power of the monitored target changing with time in the process of the voltage sag event;
and determining the composition information of the sensitive load accessed to the monitored target based on the active power curve so as to instruct a power supplier to manage the voltage sag according to the composition information.
2. The method according to claim 1, wherein the determining information about the composition of the sensitive load connected to the monitored target based on the active power curve comprises:
determining a catastrophe point on the active power curve, wherein the catastrophe point comprises a descending initial point, a descending end point and a ascending end point, the descending initial point is an initial point of an active power descending section, the descending end point is an end point of the active power descending section, and the ascending end point is an end point of an active power ascending section;
and determining the composition information according to the mutation points.
3. The method according to claim 2, wherein the determining the composition information according to the mutation point comprises:
determining the proportion of sensitive loads in user loads accessed to the monitored target according to the active power corresponding to the descending starting point and the active power corresponding to the descending terminating point;
determining the proportion of a first sensitive load in user loads accessed to the monitored target according to the active power corresponding to the descending starting point and the active power corresponding to the ascending terminating point, wherein the first sensitive load is a sensitive load of which the active power cannot be recovered after the voltage sag event;
and determining the proportion of a second sensitive load in the user loads accessed to the monitored target according to the active power corresponding to the descending starting point, the active power corresponding to the descending terminating point and the active power corresponding to the ascending terminating point, wherein the second sensitive load is a sensitive load which can be recovered by the active power after the voltage sag event.
4. The method according to claim 2, wherein the determining the composition information according to the mutation point comprises:
obtaining a voltage sag tolerance curve of at least one preset sensitive load;
and determining the occupation ratio of various preset sensitive loads in the user loads accessed to the monitored target according to the voltage sag tolerance curve and the catastrophe points corresponding to the voltage sag events for N times, wherein N is a positive integer.
5. The voltage sag management method according to claim 4, wherein after the obtaining monitoring data for a voltage sag event that has occurred in the monitored target, the voltage sag management method further comprises:
obtaining event information of a corresponding voltage sag event according to the monitoring data, wherein the event information comprises a sag amplitude value and a duration;
correspondingly, the determining the percentage of various preset sensitive loads in the user loads accessed to the monitored target according to the voltage sag tolerance curve and the catastrophe points corresponding to the voltage sag events for N times includes:
determining load condition information of the voltage sag events for N times according to the event information of the voltage sag events for N times and the voltage sag tolerance curve, wherein the load condition information is used for indicating whether various preset sensitive loads have faults in the corresponding voltage sag events;
and determining the occupation ratio of various preset sensitive loads in the user loads accessed to the monitored target according to the load condition information of the voltage sag events for N times and the catastrophe points corresponding to the voltage sag events for N times.
6. The method according to claim 5, wherein the determining, according to the load condition information of the voltage sag event for N times and the catastrophe points corresponding to the voltage sag events for N times, the percentage of various preset sensitive loads in the user loads accessed to the monitored target includes:
calculating the absolute value of the difference value of the active power corresponding to the descending starting point corresponding to the voltage sag event and the ascending terminating point corresponding to the voltage sag event;
based on the load condition information, taking the ratio of the absolute value to the active power corresponding to the drop starting point corresponding to the voltage sag event as the proportion of the sensitive load with faults in the user load accessed to the monitored target in the voltage sag event;
and obtaining the occupation ratios of various preset sensitive loads in the user loads accessed to the monitored target according to the occupation ratios of the sensitive loads with faults corresponding to the voltage sag events for N times.
7. The method according to claim 1, wherein the monitoring data includes instantaneous values of voltage and instantaneous values of current at various times of the monitored object during the corresponding voltage sag event, and the obtaining an active power curve according to the monitoring data includes:
extracting power frequency components in the voltage instantaneous value and power frequency components in the current instantaneous value to obtain voltage power frequency components and current power frequency components;
and obtaining an active power curve of the corresponding voltage sag event according to the voltage power frequency component and the current power frequency component.
8. A voltage sag management device, comprising:
the data acquisition unit is used for acquiring monitoring data of a voltage sag event which occurs to a monitored target;
a curve obtaining unit, configured to obtain an active power curve according to the monitoring data, where the active power curve is a curve of active power of the monitored target changing with time in the process of the voltage sag event;
and the information determining unit is used for determining the composition information of the sensitive load accessed to the monitored target based on the active power curve so as to instruct a power supplier to manage the voltage sag according to the composition information.
9. A terminal device comprising a memory, a processor and a computer program stored in the memory and executable on the processor, characterized in that the processor implements the method according to any of claims 1 to 7 when executing the computer program.
10. A computer-readable storage medium, in which a computer program is stored which, when being executed by a processor, carries out the method according to any one of claims 1 to 7.
CN202011266947.9A 2020-11-13 2020-11-13 Voltage sag management method, voltage sag management device and terminal equipment Active CN112564117B (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN202011266947.9A CN112564117B (en) 2020-11-13 2020-11-13 Voltage sag management method, voltage sag management device and terminal equipment

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN202011266947.9A CN112564117B (en) 2020-11-13 2020-11-13 Voltage sag management method, voltage sag management device and terminal equipment

Publications (2)

Publication Number Publication Date
CN112564117A true CN112564117A (en) 2021-03-26
CN112564117B CN112564117B (en) 2023-10-13

Family

ID=75043006

Family Applications (1)

Application Number Title Priority Date Filing Date
CN202011266947.9A Active CN112564117B (en) 2020-11-13 2020-11-13 Voltage sag management method, voltage sag management device and terminal equipment

Country Status (1)

Country Link
CN (1) CN112564117B (en)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN113189444A (en) * 2021-04-25 2021-07-30 国网江苏省电力有限公司苏州供电分公司 Voltage sag source judgment method and device
CN113671313A (en) * 2021-08-12 2021-11-19 国网安徽省电力有限公司 Anti-misoperation method, device and system for remote coordination of low-frequency low-voltage device receiving
CN117150419A (en) * 2023-10-31 2023-12-01 东莞市茂腾电子科技有限公司 Energy storage power supply operation environment detection system based on data analysis
CN117239776A (en) * 2023-08-25 2023-12-15 国网湖北省电力有限公司电力科学研究院 Target area voltage sag control method, device, system and medium

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN104300557A (en) * 2014-10-14 2015-01-21 国家电网公司 Electric power system active power oscillation type discriminating method based on support vector machine
CN105785227A (en) * 2016-04-13 2016-07-20 云南电网有限责任公司电力科学研究院 Voltage sag source positioning method

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN104300557A (en) * 2014-10-14 2015-01-21 国家电网公司 Electric power system active power oscillation type discriminating method based on support vector machine
CN105785227A (en) * 2016-04-13 2016-07-20 云南电网有限责任公司电力科学研究院 Voltage sag source positioning method

Non-Patent Citations (3)

* Cited by examiner, † Cited by third party
Title
WEI KONG等: "Voltage Sag Source Location Based on Instantaneous Energy Detection", 《2007 INTERNATIONAL POWER ENGINEERING CONFERENCE》 *
王昕等: "基于数据价值的电压暂降智能分析系统设计与应用", 《供用电》 *
胡翀等: "基于电压暂降监测数据的敏感负荷非侵入式识别方法", 《中国电力》 *

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN113189444A (en) * 2021-04-25 2021-07-30 国网江苏省电力有限公司苏州供电分公司 Voltage sag source judgment method and device
CN113671313A (en) * 2021-08-12 2021-11-19 国网安徽省电力有限公司 Anti-misoperation method, device and system for remote coordination of low-frequency low-voltage device receiving
CN113671313B (en) * 2021-08-12 2024-02-27 国网安徽省电力有限公司 Error prevention method, device and system for receiving remote coordination by low-frequency low-voltage device
CN117239776A (en) * 2023-08-25 2023-12-15 国网湖北省电力有限公司电力科学研究院 Target area voltage sag control method, device, system and medium
CN117150419A (en) * 2023-10-31 2023-12-01 东莞市茂腾电子科技有限公司 Energy storage power supply operation environment detection system based on data analysis
CN117150419B (en) * 2023-10-31 2024-02-02 东莞市茂腾电子科技有限公司 Energy storage power supply operation environment detection system based on data analysis

Also Published As

Publication number Publication date
CN112564117B (en) 2023-10-13

Similar Documents

Publication Publication Date Title
CN112564117A (en) Voltage sag treatment method, voltage sag treatment device and terminal equipment
CN110765685A (en) Simulation method and device for multi-physical-field coupling of reactor and storage medium
CN111106780B (en) Motor control method and device, terminal equipment and storage medium
CN114418226A (en) Fault analysis method and device of power communication system
CN110807168B (en) Method and device for estimating sub-synchronous oscillation mode of grid-connected converter
CN109934499B (en) Method, device, equipment and storage medium for evaluating low-voltage fault of equipment
CN107990929B (en) Method and device for controlling filter time constant, computer device and storage medium
WO2021136348A1 (en) Motor average current smoothing processing method and system, and motor current sampling apparatus
CN111614280B (en) Three-phase output voltage balance control method and device for parallel operation system of power converter
CN112834891B (en) Method and device for detecting failure thyristor in phase control rectifying circuit and terminal equipment
CN112803428A (en) Receiving-end main network frame dynamic reactive power supply configuration node selection method and terminal
CN114362186A (en) Power system power flow adjusting method, device, equipment and storage medium
CN111614100B (en) Alternating voltage control method and device and terminal equipment
CN115343524B (en) Micro-grid protection method and device based on truncated waveform and electronic equipment
CN114123164B (en) Method and device for calculating short-circuit capacity of power system and terminal equipment
Yuan et al. Linear interpolation process and its influence on the secondary equipment in substations
CN112531629B (en) Method and device for automatically setting protection setting value of power distribution network and terminal equipment
Kezunovic et al. Modeling of digital relay and power system signals
CN112003459B (en) Current control method and system of staggered parallel topology
CN114156864B (en) Photovoltaic inverter configuration method, device, terminal and storage medium
CN110290165B (en) Method for regulating and controlling communication load between network hosts, electronic device and readable storage medium
CN112018811A (en) Method and device for inhibiting grid-connected current mutation and terminal equipment
CN112803433A (en) Receiving-end main network frame dynamic reactive power supply configuration capacity calculation method and device
CN115935113A (en) Cable cross-sectional area type selection method and device, terminal equipment and storage medium
Zintsmaster et al. Hardware Implementation and Validation of a dc Protection Scheme Based on Local Measurements

Legal Events

Date Code Title Description
PB01 Publication
PB01 Publication
SE01 Entry into force of request for substantive examination
SE01 Entry into force of request for substantive examination
GR01 Patent grant
GR01 Patent grant