CN112104076A - Voltage event monitoring method applied to electric energy quality control device - Google Patents
Voltage event monitoring method applied to electric energy quality control device Download PDFInfo
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- CN112104076A CN112104076A CN202010929830.8A CN202010929830A CN112104076A CN 112104076 A CN112104076 A CN 112104076A CN 202010929830 A CN202010929830 A CN 202010929830A CN 112104076 A CN112104076 A CN 112104076A
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- voltage
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- voltage event
- monitoring
- power quality
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- 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
- H02J13/00002—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 monitoring
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R19/00—Arrangements for measuring currents or voltages or for indicating presence or sign thereof
- G01R19/02—Measuring effective values, i.e. root-mean-square values
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R19/00—Arrangements for measuring currents or voltages or for indicating presence or sign thereof
- G01R19/165—Indicating that current or voltage is either above or below a predetermined value or within or outside a predetermined range of values
- G01R19/16566—Circuits and arrangements for comparing voltage or current with one or several thresholds and for indicating the result not covered by subgroups G01R19/16504, G01R19/16528, G01R19/16533
- G01R19/16585—Circuits and arrangements for comparing voltage or current with one or several thresholds and for indicating the result not covered by subgroups G01R19/16504, G01R19/16528, G01R19/16533 for individual pulses, ripple or noise and other applications where timing or duration is of importance
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- 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
- H02J13/00006—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 information or instructions transport means between the monitoring, controlling or managing units and monitored, controlled or operated power network element or electrical equipment
- H02J13/00022—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 information or instructions transport means between the monitoring, controlling or managing units and monitored, controlled or operated power network element or electrical equipment using wireless data transmission
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- 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
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- 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
- Y04S10/50—Systems or methods supporting the power network operation or management, involving a certain degree of interaction with the load-side end user applications
- Y04S10/52—Outage or fault management, e.g. fault detection or location
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- 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
- Y04S40/00—Systems for electrical power generation, transmission, distribution or end-user application management characterised by the use of communication or information technologies, or communication or information technology specific aspects supporting them
- Y04S40/12—Systems for electrical power generation, transmission, distribution or end-user application management characterised by the use of communication or information technologies, or communication or information technology specific aspects supporting them characterised by data transport means between the monitoring, controlling or managing units and monitored, controlled or operated electrical equipment
- Y04S40/126—Systems for electrical power generation, transmission, distribution or end-user application management characterised by the use of communication or information technologies, or communication or information technology specific aspects supporting them characterised by data transport means between the monitoring, controlling or managing units and monitored, controlled or operated electrical equipment using wireless data transmission
Abstract
The invention relates to a voltage event monitoring method applied to a power quality management device, which fully depends on the power quality management device without increasing the cost, combines the resources of a software platform thereof, increases the voltage event monitoring function and realizes the integration of power quality management and monitoring; and a simpler algorithm is used for realizing the calculation of the voltage effective value, the occurrence and ending conditions of the voltage event are set according to the standard of IEC61000, the type, the phase characteristic value, the occurrence/ending/continuous event and the like of the voltage event are obtained, and the characteristic data of the voltage event is reported to the main station through the 4G module, thereby realizing the remote monitoring.
Description
Technical Field
The invention relates to the field of power quality low-voltage treatment, in particular to a voltage event monitoring method applied to a power quality treatment device.
Background
With the social development and the development of power electronic technology, the generated power quality problems are more and more, and the economic loss caused by the power quality problems is increased day by day, so that the power quality control device plays an increasingly important role in the social development. Reactive power, harmonic waves, three-phase imbalance and the like become the most common power quality problems, and the reactive power compensation device (SVG), the Active Power Filter (APF) and the active three-phase imbalance compensation device (AUC) solve the power quality problems to a great extent and eliminate the influence of the power quality problems on production and life.
However, the existing power quality management devices such as SVG, APF, AUC and other products only have the function of power quality management, and it is difficult to avoid voltage events at the management points, and for industrial power, voltage events such as voltage ramp, voltage sag, or short-time interruption affect the normal operation of the device, and especially for high-precision manufacturing industry, the voltage events reduce the yield and cause serious economic loss.
Disclosure of Invention
In order to solve the defects or shortcomings of the prior art, the invention aims to provide a voltage event monitoring method applied to a power quality management device.
In order to achieve the purpose, the invention provides a voltage event monitoring method applied to a power quality management device, which realizes a voltage event monitoring function in the power quality management device, realizes voltage monitoring of a mounting point of the power quality management device on the premise of not increasing cost, reports the characteristics of a voltage event to a master station in a remote communication mode, realizes remote monitoring, is convenient to check and maintain, and has the following specific working procedures:
step 1, collecting the power grid voltage by a power quality management device, and calculating the effective value of the current power grid voltage by using a half-cycle sliding effective value calculation method to serve as a basis for judging a voltage event;
step 2, setting threshold values and hysteresis ranges of voltage temporary rise, voltage temporary drop and voltage short-time interruption, combining the effective voltage values obtained in the step 1 with the threshold values and the hysteresis ranges, judging whether a voltage event occurs at a governing point, judging the type and the phase of the voltage event if the voltage event occurs, returning to the step 1 if no voltage event occurs, and repeating the steps 1 and 2 until the voltage event occurs;
step 3, recording time in real time by using a clock chip in the electric energy quality control device, and recording the starting time of a voltage event when the voltage event occurs;
step 4, recording the phase of the current voltage event and the characteristic value of the voltage event, recording the residual voltage value when a voltage sag event or a voltage short-time interruption event occurs, and recording the voltage sag amplitude value when a voltage sag event occurs;
step 5, continuously collecting the power grid voltage signals, calculating the effective value of the three-phase power grid voltage, judging whether the voltage event is ended, recording the ending time of the voltage event when the voltage event is judged to be ended, and recording the characteristic value of the final voltage event and the phase of the voltage event; if the voltage event is not judged to be ended, returning to the step 4 until the voltage event is judged to be ended;
and 6, uploading the voltage event characteristics to a master station through the recorded voltage event in a 4G communication mode, and realizing remote monitoring of the voltage event.
The electric energy quality treatment device adopts a multi-core DSP to realize the core function, and comprises: the voltage event monitoring system has the advantages that the functions of detection, control, alternate acquisition, communication and protection are achieved, a coprocessor of the DSP is used for independently monitoring voltage events to obtain voltage event characteristics, a main processor of the DSP and other coprocessors complete core functions in parallel, the voltage event monitoring requirements are met, and normal operation of other functions is not affected.
The effective value calculating method adopts a half-cycle sliding mode, is simple in calculation and implementation and suitable for calculation in a coprocessor, and the duration time of the voltage event obtained by the method meets the requirement that the error is less than 10 ms.
The voltage event characteristics that the coprocessor will obtain include: the event type, the event phase, the event characteristic value, the event start time, the event end time and the event duration time are transmitted to the main processor, the main processor is transmitted to the 4G module for remote communication through the interface, and the voltage event characteristic is transmitted to the main station through the 4G module, so that remote monitoring is facilitated.
The invention has the beneficial effects that:
the voltage event monitoring method applied to the power quality management device provided by the invention realizes monitoring of voltage events of management points on the basis of not increasing hardware cost, has more complete software functions compared with the common power quality management device, and is also beneficial to realizing a power quality comprehensive management and monitoring integrated system.
Drawings
FIG. 1 is a flow chart of a method of monitoring voltage events applied to a power quality management device in accordance with the present invention;
FIG. 2 is an implementation of the voltage event monitoring method applied to the power quality management device of the present invention;
FIG. 3 is a core control and communication unit connection diagram of the method of the present invention applied to monitoring voltage events of a power quality management device;
fig. 4 is a diagram of a remote monitoring system applied to the voltage event monitoring method of the power quality management device according to the present invention.
Detailed Description
The present invention will be described in detail by way of specific examples with reference to the accompanying drawings, but it should be understood that the following examples are only preferred embodiments of the present invention, rather than the only embodiments, and therefore, equivalent modifications or changes to the following examples by those skilled in the art are intended to be included within the scope of the present invention.
Fig. 1 is a flowchart of a voltage event monitoring algorithm in an embodiment of the invention, including:
step 1, collecting the power grid voltage by a power quality management device, and calculating the effective value of the current power grid voltage by using a half-cycle sliding effective value calculation method to serve as a basis for judging a voltage event;
step 2, setting threshold values and hysteresis ranges of voltage temporary rise, voltage temporary drop and voltage short-time interruption, combining the effective voltage values obtained in the step 1 with the threshold values and the hysteresis ranges, judging whether a voltage event occurs at a governing point, judging the type and the phase of the voltage event if the voltage event occurs, returning to the step 1 if no voltage event occurs, and repeating the steps 1 and 2 until the voltage event occurs;
step 3, recording time in real time by using a clock chip in the electric energy quality control device, and recording the starting time of a voltage event when the voltage event occurs;
step 4, recording the phase of the current voltage event and the characteristic value of the voltage event, recording the residual voltage value when a voltage sag event or a voltage short-time interruption event occurs, and recording the voltage sag amplitude value when a voltage sag event occurs;
step 5, continuously collecting the power grid voltage signals, calculating the effective value of the three-phase power grid voltage, judging whether the voltage event is ended, recording the ending time of the voltage event when the voltage event is judged to be ended, and recording the characteristic value of the final voltage event and the phase of the voltage event; if the voltage event is not judged to be ended, returning to the step 4 until the voltage event is judged to be ended;
and 6, uploading the voltage event characteristics to a master station through the recorded voltage event in a 4G communication mode, and realizing remote monitoring of the voltage event.
Wherein, still include:
if a voltage sag event and a voltage sag event occur simultaneously, event characteristics of the two types of voltage events, including an occurrence event, end time, a voltage characteristic value, an event phase and the like, are respectively recorded;
generally, due to the problems of software platform resources and the like, it is difficult to add a voltage event monitoring algorithm in the power quality management device, so that a multi-core software platform is adopted to realize a voltage event monitoring function, as shown in fig. 2, the voltage event monitoring algorithm is realized in the software platform, the power quality management device adopts a multi-core DSP chip to realize the detection, control, protection and communication functions of the power quality management device, the voltage event monitoring is independently performed by adopting one cooperative process, the voltage event characteristics are transmitted to a main processor, and data communication is performed through a serial port, so that the voltage event characteristics are convenient to check.
The core control unit realizes the monitoring of the voltage event, the voltage event characteristic is connected to the 4G module through a serial port, and data is transmitted out through the 4G chip.
As shown in fig. 4, the voltage event monitoring is performed by the overall remote monitoring system for voltage event monitoring, the power quality management device is connected to a load needing compensation, the voltage event monitoring is performed by a software platform at the power quality management staff, voltage characteristic data is transmitted to an external 4G module through a serial port, and the 4G module performs remote communication on the data such as the voltage characteristic obtained by monitoring and reports the data to a master station to perform remote monitoring of the voltage event. The voltage event monitoring function is realized in the electric energy quality control device, and the voltage event is reported to the main station in a 4G remote communication mode, so that a control and monitoring integrated system can be realized.
Claims (4)
1. The utility model provides a be applied to power quality and administer device voltage incident monitoring method, its characterized in that realizes voltage incident monitoring function in power quality administers the device, realizes the voltage monitoring of administering the point under the prerequisite that does not increase the cost to report the characteristic of voltage incident to the master station through the mode of telecommunication, realized remote monitoring, conveniently look over and maintain, specifically as follows:
step 1, collecting the power grid voltage by a power quality management device, and calculating the effective value of the current power grid voltage by using a half-cycle sliding effective value calculation method to serve as a basis for judging a voltage event;
step 2, setting threshold values and hysteresis ranges of voltage temporary rise, voltage temporary drop and voltage short-time interruption, combining the effective voltage values obtained in the step 1 with the threshold values and the hysteresis ranges, judging whether a voltage event occurs at a governing point, judging the type and the phase of the voltage event if the voltage event occurs, returning to the step 1 if no voltage event occurs, and repeating the steps 1 and 2 until the voltage event occurs;
step 3, recording time in real time by using a clock chip in the electric energy quality control device, and recording the starting time of a voltage event when the voltage event occurs;
step 4, recording the phase of the current voltage event and the characteristic value of the voltage event, recording the residual voltage value when a voltage sag event or a voltage short-time interruption event occurs, and recording the voltage sag amplitude value when a voltage sag event occurs;
step 5, continuously collecting the power grid voltage signals, calculating the effective value of the three-phase power grid voltage, judging whether the voltage event is ended, recording the ending time of the voltage event when the voltage event is judged to be ended, and recording the characteristic value of the final voltage event and the phase of the voltage event; if the voltage event is not judged to be ended, returning to the step 4 until the voltage event is judged to be ended;
and 6, uploading the voltage event characteristics to a master station through the recorded voltage event in a 4G communication mode, and realizing remote monitoring of the voltage event.
2. The method for monitoring the voltage event applied to the power quality management device according to claim 1, wherein the power quality management device adopts a multi-core DSP to realize the core function thereof, and comprises: the voltage event monitoring system has the advantages that the functions of detection, control, alternate acquisition, communication and protection are achieved, a coprocessor of the DSP is used for independently monitoring voltage events to obtain voltage event characteristics, a main processor of the DSP and other coprocessors complete core functions in parallel, the voltage event monitoring requirements are met, and normal operation of other functions is not affected.
3. The method for monitoring the voltage event applied to the power quality management device according to claim 1, wherein the effective value calculation method adopts a half-cycle sliding mode, the calculation and implementation of the effective value calculation method are simple, the method is suitable for calculation in a coprocessor, and the duration time of the voltage event obtained by the method meets the requirement that the error is less than 10 ms.
4. The method as claimed in claim 2, wherein the voltage event monitoring method applied to the power quality management device is characterized in that the voltage event characteristics obtained by the coprocessor comprise: the event type, the event phase, the event characteristic value, the event start time, the event end time and the event duration time are transmitted to the main processor, the main processor is transmitted to the 4G module for remote communication through the interface, and the voltage event characteristic is transmitted to the main station through the 4G module, so that remote monitoring is facilitated.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202010929830.8A CN112104076A (en) | 2020-09-07 | 2020-09-07 | Voltage event monitoring method applied to electric energy quality control device |
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| CN202010929830.8A CN112104076A (en) | 2020-09-07 | 2020-09-07 | Voltage event monitoring method applied to electric energy quality control device |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN116840622A (en) * | 2023-07-07 | 2023-10-03 | 云木科技有限公司 | Power distribution terminal test system based on electric quantity input and output comparison calculation |
Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101354419A (en) * | 2008-08-29 | 2009-01-28 | 深圳市奇辉电气有限公司 | Non-space electric energy quality on-line monitoring device |
| CN101363896A (en) * | 2008-09-25 | 2009-02-11 | 长沙威胜能源产业技术有限公司 | High precision voltage transient event detection and wave-recording method |
| CN103208856A (en) * | 2013-03-19 | 2013-07-17 | 江苏中凌高科技有限公司 | Flexible configured power quality monitoring and management integrated device |
| US20150094966A1 (en) * | 2013-10-01 | 2015-04-02 | King Abdulaziz City For Science And Technology | Quadrature-based voltage events detection method |
| CN106505741A (en) * | 2016-12-19 | 2017-03-15 | 成都城电电力工程设计有限公司 | A kind of electric energy quality monitoring administering method at electric automobile charging pile based on Internet of Things |
| CN107144726A (en) * | 2017-06-09 | 2017-09-08 | 深圳市中电电力技术股份有限公司 | A kind of A step voltages transient state monitoring device, method and system |
| CN107782994A (en) * | 2017-10-20 | 2018-03-09 | 广州供电局有限公司 | Power Quality Transient event monitoring method and device |
| CN110554231A (en) * | 2019-07-24 | 2019-12-10 | 深圳供电局有限公司 | Voltage monitoring method, voltage monitoring device, computer equipment and storage medium |
-
2020
- 2020-09-07 CN CN202010929830.8A patent/CN112104076A/en not_active Withdrawn
Patent Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101354419A (en) * | 2008-08-29 | 2009-01-28 | 深圳市奇辉电气有限公司 | Non-space electric energy quality on-line monitoring device |
| CN101363896A (en) * | 2008-09-25 | 2009-02-11 | 长沙威胜能源产业技术有限公司 | High precision voltage transient event detection and wave-recording method |
| CN103208856A (en) * | 2013-03-19 | 2013-07-17 | 江苏中凌高科技有限公司 | Flexible configured power quality monitoring and management integrated device |
| US20150094966A1 (en) * | 2013-10-01 | 2015-04-02 | King Abdulaziz City For Science And Technology | Quadrature-based voltage events detection method |
| CN106505741A (en) * | 2016-12-19 | 2017-03-15 | 成都城电电力工程设计有限公司 | A kind of electric energy quality monitoring administering method at electric automobile charging pile based on Internet of Things |
| CN107144726A (en) * | 2017-06-09 | 2017-09-08 | 深圳市中电电力技术股份有限公司 | A kind of A step voltages transient state monitoring device, method and system |
| CN107782994A (en) * | 2017-10-20 | 2018-03-09 | 广州供电局有限公司 | Power Quality Transient event monitoring method and device |
| CN110554231A (en) * | 2019-07-24 | 2019-12-10 | 深圳供电局有限公司 | Voltage monitoring method, voltage monitoring device, computer equipment and storage medium |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN116840622A (en) * | 2023-07-07 | 2023-10-03 | 云木科技有限公司 | Power distribution terminal test system based on electric quantity input and output comparison calculation |
| CN116840622B (en) * | 2023-07-07 | 2024-01-26 | 云木科技有限公司 | Power distribution terminal test system based on electric quantity input and output comparison calculation |
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