CN112564110B - Transformer area low-voltage treatment method and system - Google Patents
Transformer area low-voltage treatment method and system Download PDFInfo
- Publication number
- CN112564110B CN112564110B CN202110204400.4A CN202110204400A CN112564110B CN 112564110 B CN112564110 B CN 112564110B CN 202110204400 A CN202110204400 A CN 202110204400A CN 112564110 B CN112564110 B CN 112564110B
- Authority
- CN
- China
- Prior art keywords
- voltage
- phase
- time sequence
- sequence data
- low
- 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.)
- Active
Links
- 238000000034 method Methods 0.000 title claims abstract description 29
- 238000011282 treatment Methods 0.000 title claims abstract description 11
- 230000007547 defect Effects 0.000 claims description 9
- 238000012163 sequencing technique Methods 0.000 claims description 9
- 238000010079 rubber tapping Methods 0.000 claims description 7
- 238000004458 analytical method Methods 0.000 abstract description 2
- 238000009472 formulation Methods 0.000 abstract 1
- 239000000203 mixture Substances 0.000 abstract 1
- 230000009466 transformation Effects 0.000 description 4
- 239000013598 vector Substances 0.000 description 4
- 238000004891 communication Methods 0.000 description 3
- 230000000694 effects Effects 0.000 description 3
- 230000004927 fusion Effects 0.000 description 3
- 238000012423 maintenance Methods 0.000 description 3
- 238000011269 treatment regimen Methods 0.000 description 3
- 150000001875 compounds Chemical class 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 239000012141 concentrate Substances 0.000 description 1
- 239000013256 coordination polymer Substances 0.000 description 1
- 230000005611 electricity Effects 0.000 description 1
- 230000008030 elimination Effects 0.000 description 1
- 238000003379 elimination reaction Methods 0.000 description 1
- 238000004128 high performance liquid chromatography Methods 0.000 description 1
- 230000002045 lasting effect Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
- 239000002699 waste material Substances 0.000 description 1
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
- H02J3/001—Methods to deal with contingencies, e.g. abnormalities, faults or failures
-
- 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
- H02J3/00—Circuit arrangements for ac mains or ac distribution networks
- H02J3/26—Arrangements for eliminating or reducing asymmetry in polyphase networks
-
- 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
- Y02E40/00—Technologies for an efficient electrical power generation, transmission or distribution
- Y02E40/50—Arrangements for eliminating or reducing asymmetry in polyphase networks
Landscapes
- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Remote Monitoring And Control Of Power-Distribution Networks (AREA)
Abstract
The invention discloses a method and a system for low-voltage treatment of a transformer area, wherein the method comprises the following steps: step 1: acquiring outlet data of a transformer area and user side data, wherein the outlet data of the transformer area comprises three-phase voltage of the outlet of the transformer area, three-phase current of the outlet of the transformer area and tap switch gear data of a distribution transformer, and the user side data comprises low voltage of the user side; step 2: generating a user side low voltage event according to the user side data; and step 3: and analyzing the event reason of the user side low voltage event based on the platform area outlet data. Through gathering platform district export and user side data, manage the strategy to user side low-voltage reason analysis and formulation reasonable low-voltage, can realize the accurate management of platform district low-voltage.
Description
Technical Field
The invention belongs to the technical field of distribution and utilization of electricity, and particularly relates to a method and a system for low-voltage treatment of a transformer area.
Background
As an important index of the quality of electric energy, the quality of the voltage can directly reflect whether the electric energy provided by a power supply department to a user is qualified or not, the quality of the electric energy can directly generate great influence on the user (especially sensitive users such as medical equipment, automation equipment, communication equipment, computers and the like), and if proper relieving measures are not taken, the voltage interference can influence the normal work of the equipment and even cause the damage of the equipment.
Domestic power supply companies all carry out a large amount of work on distribution network voltage quality management, but because the actual conditions of distribution networks, especially user side data volume are very complicated, these projects do not involve low-voltage distribution area transformation at present, and still concentrate on aspects such as reactive compensation of medium-voltage distribution networks and partial lines.
Whether the voltage of the transformer area is qualified or not is directly related to the quality of the voltage of the user. At present, only three-phase voltage, current and other electric quantity data of a low-voltage side of a distribution transformer are monitored in a transformer area, and the reason of the low voltage of a user side cannot be accurately mastered, so that repeated operation and maintenance transformation of the transformer area is caused, and great labor and investment waste is caused.
Disclosure of Invention
The invention provides a method for treating a transformer area with low voltage, which is used for solving at least one technical problem.
The invention provides a low-voltage treatment method for a transformer area, which comprises the following steps: step 1: acquiring outlet data of a transformer area and user side data, wherein the outlet data of the transformer area comprises three-phase voltage of the outlet of the transformer area, three-phase current of the outlet of the transformer area and tap switch gear data of a distribution transformer, and the user side data comprises low voltage of the user side; step 2: generating a user side low voltage event according to the user side data; and step 3: analyzing the event reason of the user side low voltage event based on the platform zone outlet data, wherein the analyzing the event reason comprises: step 3.1: sequencing according to the occurrence time of the low-voltage events, and grouping the low-voltage events at the user side based on a time interval; step 3.2: judging whether the distribution transformer gear is in a first gear or a second gear during the generation of a low-voltage event group at a certain user side according to the distribution transformer tapping switch gear data; step 3.3: if the gear of the distribution transformer is not in the first gear or the second gear during the generation period of a certain user-side low-voltage event group, acquiring the time sequence data of the outlet three-phase voltage of the transformer area and the time sequence data of the outlet three-phase current of the transformer area of the certain user-side low-voltage event group on the same day, subtracting the minimum value of the three-phase voltage from the maximum value of the three-phase voltage of each acquisition point on the same day to obtain voltage difference time sequence data, and subtracting the minimum value of the three-phase current from the maximum value of the three-phase current of each acquisition point; calculating correlation coefficients of three voltage sequences of a station area outlet A phase and B phase, B phase and C phase and A phase and C phase of a certain user side low-voltage event group on the same day, setting a first threshold of the correlation coefficients, and judging whether the minimum value in the correlation coefficients of the three voltage sequences is greater than the first threshold and whether the minimum value in voltage difference time sequence data during the generation of the certain user side low-voltage event group is less than 4V; if the minimum value of the three voltage sequence correlation coefficients is not greater than a first threshold value or the minimum value of the voltage difference time sequence data in the generation period of the certain user side low-voltage event group is not less than 4V, aligning the voltage difference time sequence data with the current difference time sequence data according to the acquisition time, calculating the correlation coefficients of the voltage difference time sequence data and the current difference time sequence data, setting a second threshold value of the correlation coefficients, and judging whether the correlation coefficients of the voltage difference time sequence data and the current difference time sequence data are greater than the second threshold value and whether the minimum value of the voltage difference time sequence data is less than 40V; and if the correlation coefficient of the voltage difference time sequence data and the current difference time sequence data is not larger than a second threshold value or the minimum value in the voltage difference time sequence data is not smaller than 40V, judging that the reason of the user side low-voltage event group is the fault of the platform area outlet defect.
In some embodiments of the invention, after step 3, the method further comprises step 4: and according to the reason of the low-voltage event at the user side, making a corresponding low-voltage governing strategy for the transformer area.
In some embodiments of the invention, in step 3.3, said aligning the voltage difference timing data and the current difference timing data by a collection time comprises: and if the voltage difference time sequence data or the current difference time sequence data are lacked at a certain collecting point, the voltage difference time sequence data and the current difference time sequence data at the collecting point are removed.
In some embodiments of the invention, in step 3, the correlation coefficient is calculated as follows:
in the formula (I), the compound is shown in the specification,
、
respectively collecting values at the time of two time sequence data vectors i,
、
respectively representing the average values of n acquisition points of two time sequence data vectors.
In some embodiments of the invention, said step 3.1 comprises: grouping the generated low-voltage events at the user side by day, sequencing the events based on the occurrence time of the low-voltage events, and analyzing the events in the low-voltage event group at the user side after the events are grouped by day; and if the low-voltage event occurrence time interval between a certain user side low-voltage event in the group and another user side low-voltage event is more than 65 minutes, grouping again to divide the user side low-voltage events into N groups.
In some embodiments of the invention, after step 3.3, said analyzing the event cause further comprises step 3.4: judging whether the maximum value of the distribution room outlet three-phase voltage average value sequence during the generation period of a certain user side low-voltage event group is less than 207V or not; and if the maximum value of the outlet three-phase voltage average value sequence of the transformer area during the generation period of a certain user side low-voltage event group is less than 207V, judging that the reason of the user side low-voltage event group is 10kV line fault.
In some embodiments of the invention, after step 3.3, said analyzing the event cause further comprises step 3.5: judging whether the maximum value of the distribution area outlet three-phase voltage average value sequence is not less than 207V and whether the distribution transformer connection group is Yyn0 type during the generation period of a certain user side low-voltage event group; and if the maximum value of the distribution area outlet three-phase voltage average value sequence during the generation period of a certain user-side low-voltage event group is not less than 207V and the distribution transformer connection group is Yyn0 type, determining that the reason of the user-side low-voltage event group is the distribution area three-phase imbalance fault.
In some embodiments of the invention, after step 3.3, said analyzing the event cause further comprises step 3.6: judging whether the low voltage of the A-phase user sides of at least two users is different, the low voltage of the B-phase user sides of at least two users is different and the low voltage of the C-phase user sides of at least two users is different in a certain user side low voltage event group; if the low voltage of the A-phase user sides of at least two users is different, the low voltage of the B-phase user sides of at least two users is different and the low voltage of the C-phase user sides of at least two users is different in a certain user side low voltage event group, determining that the reason of the user side low voltage event group is a low-voltage line fault; and if the low voltage of the A-phase user side of at least two users is different, the low voltage of the B-phase user side of at least two users is different and the low voltage of the C-phase user side of at least two users is different do not exist in a certain user side low voltage event group, judging that the reason of the user side low voltage event group is the wiring fault of the user meter.
In some embodiments of the present invention, the certain user-side low voltage event group generation period is from an earliest time to a latest time.
The invention also provides a platform district low voltage treatment system, including: the acquisition module is configured to acquire station outlet data and user side data, wherein the station outlet data comprises station outlet three-phase voltage, station outlet three-phase current and distribution transformer tap switch gear data, and the user side data comprises user side low voltage; a generating module configured to generate a user-side low voltage event according to the user-side data; a determining module configured to analyze an event cause for the user-side low voltage event based on the station outlet data, wherein the event cause includes: sequencing according to the occurrence time of the low-voltage events, and grouping the low-voltage events at the user side based on a time interval; judging whether the distribution transformer gear is in a first gear or a second gear during the generation of a low-voltage event group at a certain user side according to the distribution transformer tapping switch gear data; if the gear of the distribution transformer is not in the first gear or the second gear during the generation period of a certain user-side low-voltage event group, acquiring the time sequence data of the outlet three-phase voltage of the transformer area and the time sequence data of the outlet three-phase current of the transformer area of the certain user-side low-voltage event group on the same day, subtracting the minimum value of the three-phase voltage from the maximum value of the three-phase voltage of each acquisition point on the same day to obtain voltage difference time sequence data, and subtracting the minimum value of the three-phase current from the maximum value of the three-phase current of each acquisition point; calculating correlation coefficients of three voltage sequences of a station area outlet A phase and B phase, B phase and C phase and A phase and C phase of a certain user side low-voltage event group on the same day, setting a first threshold of the correlation coefficients, and judging whether the minimum value in the correlation coefficients of the three voltage sequences is greater than the first threshold and whether the minimum value in voltage difference time sequence data during the generation of the certain user side low-voltage event group is less than 4V; if the minimum value of the three voltage sequence correlation coefficients is not greater than a first threshold value or the minimum value of the voltage difference time sequence data in the generation period of the certain user side low-voltage event group is not less than 4V, aligning the voltage difference time sequence data with the current difference time sequence data according to the acquisition time, calculating the correlation coefficients of the voltage difference time sequence data and the current difference time sequence data, setting a second threshold value of the correlation coefficients, and judging whether the correlation coefficients of the voltage difference time sequence data and the current difference time sequence data are greater than the second threshold value and whether the minimum value of the voltage difference time sequence data is less than 40V; and if the correlation coefficient of the voltage difference time sequence data and the current difference time sequence data is not larger than a second threshold value or the minimum value in the voltage difference time sequence data is not smaller than 40V, judging that the reason of the user side low-voltage event group is the fault of the platform area outlet defect.
According to the method and the system for low-voltage treatment of the transformer area, the outlet of the transformer area and the data of the user side are collected, the reason of the low voltage of the user side is analyzed, a reasonable low-voltage treatment strategy is formulated, and the low voltage of the transformer area can be accurately treated.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings needed to be used in the description of the embodiments are briefly introduced below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings based on the drawings without creative efforts.
Fig. 1 is a flowchart of a method for low-voltage treatment of a distribution room according to an embodiment of the present invention;
fig. 2 is a flow chart of a method for low voltage treatment of a distribution room according to an embodiment of the present invention;
fig. 3 is a flow chart illustrating a defect problem determination process at an exit of a distribution room according to an embodiment of the present invention;
fig. 4 is a block diagram of a structure of a platform area low-voltage abatement system according to an embodiment of the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are some, but not all, embodiments of the present invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Referring to fig. 1, a flow chart of an embodiment of a station area low voltage abatement method of the present application is shown.
As shown in fig. 1, in step 1, station outlet data and user side data are collected, wherein the station outlet data includes a station outlet three-phase voltage, a station outlet three-phase current and distribution transformer tap switch gear data, and the user side data includes a user side low voltage;
in step 2, generating a user side low voltage event according to user side data;
in step 3, analyzing the event reason for the low voltage event at the user side based on the platform outlet data, wherein the analyzing the event reason comprises:
step 3.1: sequencing according to the occurrence time of the low-voltage events, and grouping the low-voltage events at the user side based on a time interval;
step 3.2: judging whether the distribution transformer gear is in a first gear or a second gear during the generation period of a low-voltage event group at a certain user side according to the distribution transformer tapping switch gear data;
step 3.3: if the gear of the distribution transformer is not in the first gear or the second gear during the generation period of a certain user-side low-voltage event group, acquiring the time sequence data of the outlet three-phase voltage of the transformer area and the time sequence data of the outlet three-phase current of the transformer area of the certain user-side low-voltage event group on the same day, subtracting the minimum value of the three-phase voltage from the maximum value of the three-phase voltage of each acquisition point on the same day to obtain voltage difference time sequence data, and subtracting the minimum value of the three-phase current from the maximum value of the three-phase current of each acquisition point;
calculating correlation coefficients of three voltage sequences of a station area outlet A phase and a B phase, a B phase and a C phase and a A phase and a C phase of a low-voltage event group at the current day of a certain user side, setting a first threshold of the correlation coefficients, and judging whether the minimum value in the correlation coefficients of the three voltage sequences is greater than the first threshold and whether the minimum value in voltage difference time sequence data during the generation of the low-voltage event group at the certain user side is less than 4V;
if the minimum value of the three voltage sequence correlation coefficients is not greater than a first threshold value or the minimum value of the voltage difference time sequence data in the generation period of a certain user side low-voltage event group is not less than 4V, aligning the voltage difference time sequence data with the current difference time sequence data according to the acquisition time, calculating the correlation coefficients of the voltage difference time sequence data and the current difference time sequence data, setting a second threshold value of the correlation coefficients, and judging whether the correlation coefficients of the voltage difference time sequence data and the current difference time sequence data are greater than the second threshold value and whether the minimum value of the voltage difference time sequence data is less than 40V;
and if the correlation coefficient of the voltage difference time sequence data and the current difference time sequence data is not larger than a second threshold value or the minimum value in the voltage difference time sequence data is not smaller than 40V, judging that the reason of the user-side low-voltage event group is the fault of the platform outlet defect.
In this embodiment, for step 1, station outlet data and user side data are collected, where the station outlet data includes a station outlet three-phase voltage, a station outlet three-phase current, and distribution transformer tap switch gear data, and the user side data includes a user side low voltage. Thereafter, for step 2, a user side low voltage event is generated from the user side data. Thereafter, for step 3, the event cause is analyzed for the user side low voltage event based on the station area exit data.
According to the scheme provided by the embodiment, the outlet data of the transformer area and the user side data are collected, the user side low voltage event is generated according to the user side data, the generated user side low voltage event can be beneficial to judging whether the user side has low voltage according to the collected user side voltage data, the user side low voltage event is analyzed based on the transformer area outlet data, the reason of the user side low voltage can be accurately mastered, and the transformer area is prevented from being repeatedly operated and maintained.
In one embodiment, a user-side low voltage event group is generated from an earliest time to a latest time.
In some optional embodiments, the method of the present application further comprises step 4: and according to the reason of the low-voltage event at the user side, making a corresponding low-voltage governing strategy for the transformer area.
In some optional embodiments, aligning the voltage difference timing data and the current difference timing data by a collection time comprises: and if the voltage difference time sequence data or the current difference time sequence data are lacked at a certain collecting point, the voltage difference time sequence data and the current difference time sequence data at the collecting point are removed. Thus, the alignment accuracy of the voltage difference timing data and the current difference timing data can be improved.
In some alternative embodiments, step 3.1 comprises: grouping the generated low-voltage events at the user side by day, sequencing the events based on the occurrence time of the low-voltage events, and analyzing the events in the low-voltage event group at the user side after the events are grouped by day; and if the occurrence time interval between a certain user side low voltage event in the group and another user side low voltage event is more than 65 minutes, grouping again to divide the user side low voltage events into N groups. Thus, the purpose of performing the regrouping is: if the occurrence time interval of two low voltage events is smaller than 65 minutes, the two low voltage events are caused by the same reason, if the occurrence time interval is larger than 65 minutes, the two low voltage events are possibly not caused by the same reason and need to be grouped again, and after the sets are grouped according to the time interval on a daily basis, the low voltage reasons of each user side can be further analyzed.
In some optional embodiments, analyzing the event cause further comprises: judging whether the maximum value of the distribution room outlet three-phase voltage average value sequence during the generation period of a certain user side low-voltage event group is less than 207V or not; and if the maximum value of the outlet three-phase voltage average value sequence of the transformer area during the generation period of a certain user side low-voltage event group is less than 207V, judging that the reason of the user side low-voltage event group is a 10kV line fault.
In some optional embodiments, analyzing the event cause further comprises: judging whether the maximum value of the distribution area outlet three-phase voltage average value sequence is not less than 207V and whether the distribution transformer connection group is Yyn0 type during the generation period of a certain user side low-voltage event group; and if the maximum value of the distribution area outlet three-phase voltage average value sequence during the generation period of a certain user-side low-voltage event group is not less than 207V and the distribution transformer connection group is Yyn0 type, determining that the reason of the user-side low-voltage event group is the distribution area three-phase imbalance fault.
In some optional embodiments, analyzing the event cause further includes determining whether there is a difference in a-phase user-side low voltage of at least two users, and a difference in a-phase user-side low voltage of at least two users in a certain user-side low voltage event group; if the low voltage of the A-phase user sides of at least two users is different, the low voltage of the B-phase user sides of at least two users is different and the low voltage of the C-phase user sides of at least two users is different in a certain user side low voltage event group, the reason of the user side low voltage event group is judged to be a low-voltage line fault; and if the low voltage of the A-phase user side of at least two users is different, the low voltage of the B-phase user side of at least two users is different and the low voltage of the C-phase user side of at least two users is different do not exist in a certain user side low voltage event group, judging that the reason of the user side low voltage event group is the wiring fault of the user meter.
Referring to fig. 2, a flow chart of a station area low voltage abatement method according to an embodiment of the present application is shown.
As shown in fig. 2, the method for treating the low voltage of the transformer area comprises the following steps:
(1) data acquisition platform area and user side
The transformer substation is additionally provided with a distribution transformer tap switch gear sensing device, a three-phase electric energy meter is arranged on the low-voltage side of an outlet of the transformer substation, a three-phase electric energy meter or a single-phase electric energy meter is arranged on the user side of the transformer substation, and the voltage of the user side is
Data are transmitted to a distribution transformer fusion terminal or a concentrator through HPLC communication, and three-phase voltage is output from a distribution area
Three-phase current
Three-phase active power
Three-phase reactive power
And distribution transformer tapping switch gear
Data are transmitted to the distribution transformer fusion terminal or the concentrator in an RS485 communication mode, the acquisition interval can be set according to actual conditions, generally 15min is taken, and the distribution transformer fusion terminal or the concentrator transmits distribution transformer time sequence data to a front acquisition server and a storage server.
(2) Generating user-side low voltage events
Low voltage at user sideEvent is sent from user side
Generating time sequence data, which comprises the following steps:
for a three-phase power consumer:
step (2.01): if each acquisition point of the three-phase voltage value is less than 198V and lasts for 1 hour or more, generating, wherein the event information comprises a station area name, a user name, the lowest voltage, the low voltage starting time, the low voltage ending time, an event type (whole), a user type (three-phase user), whether the A phase is low voltage, whether the B phase is low voltage and whether the C phase is low voltage, defining that the three-phase low voltage event is a three-phase power user, and then circulating to the step (2.02);
step (2.02): if each acquisition point of a certain two-phase voltage value in the three phases is less than 198V and lasts for 1 hour or more, generating, wherein the event information comprises a station area name, a user name, the lowest voltage, the low voltage starting time, the low voltage ending time, an event type (two phases), a user type (three-phase users), whether the A phase is low voltage, whether the B phase is low voltage and whether the C phase is low voltage, defining that the event is a two-phase low voltage event of the three-phase power users, and then transferring to the step (2.03);
step (2.03): and if each acquisition point of a certain single-phase voltage value in the three phases is less than 198V and lasts for 1 hour or more, generating, wherein the event information comprises a station area name, a user name, the lowest voltage, the low voltage starting time, the low voltage ending time, an event type (single phase), a user type (three-phase user), whether the A phase is low voltage, whether the B phase is low voltage and whether the C phase is low voltage, defining the event as a single-phase low-voltage event of the three-phase power user, and if the event is not satisfied, not generating.
For single-phase power consumers:
each collection point of the voltage value of the single-phase power user is less than 198V and is generated after lasting for 1 hour or more, the event information comprises a station area name, a user name, the lowest voltage, the low voltage starting time, the low voltage ending time, an event type (single phase), the user type (single-phase user), whether the phase A is low voltage, whether the phase B is low voltage and whether the phase C is low voltage, the single-phase power is defined, and if the single-phase power is not met, the generation is not performed.
(3) Automatic analysis of user-side low voltage causes
For the generated low-voltage events, grouping the generated low-voltage events according to the day, sequencing the generated low-voltage events according to the occurrence time of the low-voltage events, and finally grouping the generated low-voltage events into N groups if the occurrence time interval of every two low-voltage events is less than 65 minutes, and sequentially analyzing reasons of each group, wherein a specific flow chart is shown in FIG. 3:
the method comprises the following specific steps:
step (3.01): judging whether the distribution transformer gear is in 1 or 2 gears during the group generation period according to the distribution transformer tap switch gear (CP) data, wherein the earliest occurrence time in the group is the group generation period starting time, the latest occurrence time in the group is the group generation period ending time, and if so, judging that the group reason is that the distribution transformer gear in the transformer area is low; if not, the flow goes to the step (3.02);
step (3.02): three-phase voltage at outlet of current transformer area of group-taking current transformer area
Three-phase current
And time sequence data, namely subtracting the three-phase voltage minimum value from the three-phase voltage maximum value of each acquisition point on the day to obtain voltage difference delta U time sequence data, and subtracting the three-phase current minimum value from the three-phase current maximum value of each acquisition point on the day to obtain current difference delta I time sequence data.
Calculating three voltage sequence correlation coefficients of phase A and phase B, phase B and phase C and phase A and phase C at the outlet of the distribution transformer on the same day, and taking the minimum value of the three correlation coefficients
Setting a first threshold (default value 0.9) of the correlation coefficient if the first threshold is set as shown in the correlation coefficient calculation formula (1)
If the voltage difference is larger than the first threshold value and the minimum value in the voltage difference delta U time sequence data during the group generation period is smaller than 4V, the connection group of the distribution transformer is judged to be Dyn11 type and the voltage data is normal, otherwise, the further judgment is carried out, the voltage difference delta U time sequence data and the current difference delta I time sequence data of the current day are aligned according to the acquisition time, if a certain acquisition point lacks the voltage difference or the current difference time sequence data, the voltage difference and the current difference time sequence data of the acquisition point are deleted, the correlation coefficient of the voltage difference delta U time sequence data and the current difference delta I time sequence data is calculated, and the correlation coefficient is
Setting a second threshold value (default value 0.9) of the correlation coefficient if
If the voltage difference is greater than the second threshold and the minimum value in the voltage difference delta U time sequence data is less than 40V, the connection group of the distribution transformer is judged to be Yyn0 type and the voltage data is normal, the flow is transferred to the step (3.03), otherwise, the reason of the group is judged to be the problem of the platform outlet defect, and the specific flow is shown in FIG. 3.
In the formula (I), the compound is shown in the specification,
、
respectively collecting values at the time of two time sequence data vectors i,
、
respectively two time series data vectors n average values of the acquisition points,
can be
Or
。
Step (3.03): on the basis that the step (3.01) and the step (3.02) judge that the gear of a branch switch of the distribution transformer is reasonable and the data of a station outlet is normal, judging whether the maximum value of the average value sequence of the three-phase voltage of the station outlet is smaller than 207V or not during the low voltage generation period of a low voltage group at the user side, if so, judging that the group is caused by the problem of a 10kV line, and if not, circulating to the step (3.04);
step (3.04): judging whether the maximum value of the average value sequence of the three-phase voltages at the outlet of the transformer area is not less than 207V and whether the distribution transformer connection group is Yyn0 type during the low voltage generation period of the low voltage group at the user side, if so, judging that the reason of the group is the problem of three-phase imbalance of the transformer area, and then, turning to the step (3.05);
step (3.05): if the user side low voltage event group has more than 2 users with different A phase user side low voltages, more than 2 users with different B phase user side low voltages and more than 2 users with different C phase user side low voltages, if yes, the group is judged to have the low voltage line problem, and if not, the user meter wiring problem is judged.
(4) Formulating a low-voltage treatment strategy for a transformer area
In a statistical period, all low-voltage events at the user side are classified, counted and summarized according to reasons, a low-voltage treatment strategy of a transformer area is formulated according to the principle of operation and maintenance before transformation, operation and maintenance measures such as corresponding load regulation, gear regulation, shortage elimination, loosening of household meter wiring and the like are taken for the problems of unbalanced three phases, unreasonable gears and outlet defects of the transformer area, and project transformation measures are taken for the problems of 10kV lines and low-voltage lines in the low voltage of the transformer area.
The technical effects that the scheme can achieve the following effects are as follows:
1. on the basis of data acquisition of a distribution transformer, a three-phase low-voltage event, a two-phase low-voltage event and a single-phase low-voltage event are generated according to voltage data of a transformer area user side, the three-phase low-voltage event, the two-phase low-voltage event and the single-phase low-voltage event are generated for a three-phase power user, whether low voltage exists at an outlet of the transformer area and the user or not can be judged, based on a low-voltage event judgment rule, if the transformer area and the user generate low voltage, treatment is carried out, and the low voltage existing in the transformer area and the user are found out by generating the low-voltage event, namely, the comb area and the connected user do.
2. On the basis of data acquisition of the distribution transformer, the three-phase voltage and three-phase current data of the transformer area are considered to be utilized, whether the voltage data of the outlet of the transformer area is normal or not is automatically analyzed, and whether the reason is the problem of the outlet defect of the transformer area or not is further judged.
3. On the basis of data acquisition of the distribution transformer, whether the distribution transformer in the transformer area is unreasonable in gear, unbalanced in three phases in the transformer area, 10kV line, low-voltage line and household meter wiring is automatically analyzed, and a low-voltage management strategy in the transformer area is further determined.
Referring to fig. 4, a block diagram of a platform area low voltage abatement system of the present application is shown.
As shown in FIG. 4, the platform area low voltage abatement system 200 includes an acquisition module 210, a generation module 220, and a determination module 230.
The acquisition module 210 is configured to acquire station outlet data and user side data, where the station outlet data includes a station outlet three-phase voltage, a station outlet three-phase current, and distribution transformer tap switch gear data, and the user side data includes a user side low voltage; a generating module 220 configured to generate a user-side low voltage event according to the user-side data; the determining module 230 is configured to analyze the event reason for the low voltage event at the user side based on the platform outlet data, where the analyzing the event reason includes: sequencing according to the occurrence time of the low-voltage events, and grouping the low-voltage events at the user side based on a time interval; judging whether the distribution transformer gear is in a first gear or a second gear during the generation period of a low-voltage event group at a certain user side according to the distribution transformer tapping switch gear data; acquiring time sequence data of the outlet three-phase voltage of the transformer area and the outlet three-phase current of the transformer area of a certain user side low-voltage event group on the same day, subtracting the minimum value of the three-phase voltage from the maximum value of the three-phase voltage of each acquisition point on the same day to obtain voltage difference time sequence data, and subtracting the minimum value of the three-phase current from the maximum value of the three-phase current of each acquisition point on the same day to obtain current difference time sequence data; calculating correlation coefficients of three voltage sequences of a station area outlet A phase and a B phase, a B phase and a C phase and a A phase and a C phase of a low-voltage event group at the current day of a certain user side, setting a first threshold of the correlation coefficients, and judging whether the minimum value in the correlation coefficients of the three voltage sequences is greater than the first threshold and whether the minimum value in voltage difference time sequence data during the generation of the low-voltage event group at the certain user side is less than 4V; and if the minimum value of the three voltage sequence correlation coefficients is not greater than a first threshold value or the minimum value of the voltage difference time sequence data in the generation period of a certain user side low-voltage event group is not less than 4V, aligning the voltage difference time sequence data with the current difference time sequence data according to the acquisition time, calculating the correlation coefficients of the voltage difference time sequence data and the current difference time sequence data, setting a second threshold value of the correlation coefficients, and judging whether the correlation coefficients of the voltage difference time sequence data and the current difference time sequence data are greater than the second threshold value and whether the minimum value of the voltage difference time sequence data is less than 40V.
It should be understood that the modules depicted in fig. 4 correspond to various steps in the method described with reference to fig. 1. Thus, the operations and features described above for the method and the corresponding technical effects are also applicable to the modules in fig. 4, and are not described again here.
Finally, it should be noted that: the above examples are only intended to illustrate the technical solution of the present invention, but not to limit it; although the present invention has been described in detail with reference to the foregoing embodiments, it will 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; and such modifications or substitutions do not depart from the spirit and scope of the corresponding technical solutions of the embodiments of the present invention.
Claims (10)
1. A method for treating low voltage of a transformer area is characterized by comprising the following steps:
step 1: acquiring outlet data of a transformer area and user side data, wherein the outlet data of the transformer area comprises three-phase voltage of the outlet of the transformer area, three-phase current of the outlet of the transformer area and tap switch gear data of a distribution transformer, and the user side data comprises low voltage of the user side;
step 2: generating a user side low voltage event according to the user side data;
and step 3: analyzing the event reason of the user side low voltage event based on the platform zone outlet data, wherein the analyzing the event reason comprises:
step 3.1: sequencing according to the occurrence time of the low-voltage events, and grouping the low-voltage events at the user side based on a time interval;
step 3.2: judging whether the distribution transformer gear is in a first gear or a second gear during the generation of a low-voltage event group at a certain user side according to the distribution transformer tapping switch gear data;
step 3.3: if the gear of the distribution transformer is not in the first gear or the second gear during the generation period of a certain user-side low-voltage event group, acquiring the time sequence data of the outlet three-phase voltage of the transformer area and the time sequence data of the outlet three-phase current of the transformer area of the certain user-side low-voltage event group on the same day, subtracting the minimum value of the three-phase voltage from the maximum value of the three-phase voltage of each acquisition point on the same day to obtain voltage difference time sequence data, and subtracting the minimum value of the three-phase current from the maximum value of the three-phase current of each acquisition point;
calculating correlation coefficients between two time sequence data of the station outlet A-phase voltage time sequence data, the B-phase voltage time sequence data and the C-phase voltage time sequence data of a certain user side low voltage event group on the same day, setting a first threshold of the correlation coefficients, and judging whether the minimum value in the correlation coefficients between the two time sequence data is greater than the first threshold and whether the minimum value in the voltage difference time sequence data during the generation period of the certain user side low voltage event group is less than 4V;
if the minimum value in the correlation coefficients between every two time sequence data is not larger than a first threshold value or the minimum value in the voltage difference time sequence data in the period of generating the low-voltage event group at a certain user side is not smaller than 4V, aligning the voltage difference time sequence data with the current difference time sequence data according to the acquisition time, calculating the correlation coefficients of the voltage difference time sequence data and the current difference time sequence data, setting a second threshold value of the correlation coefficients, and judging whether the correlation coefficients of the voltage difference time sequence data and the current difference time sequence data are larger than the second threshold value and whether the minimum value in the voltage difference time sequence data is smaller than 40V;
and if the correlation coefficient of the voltage difference time sequence data and the current difference time sequence data is not larger than a second threshold value or the minimum value in the voltage difference time sequence data is not smaller than 40V, judging that the reason of the user side low-voltage event group is the fault of the platform area outlet defect.
2. The method of claim 1, wherein after step 3, the method further comprises step 4: and according to the reason of the low-voltage event at the user side, making a corresponding low-voltage governing strategy for the transformer area.
3. The method of claim 1, wherein in step 3.3, the aligning the voltage difference timing data and the current difference timing data according to the collection time comprises: and if the voltage difference time sequence data or the current difference time sequence data are lacked at a certain collecting point, the voltage difference time sequence data and the current difference time sequence data at the collecting point are removed.
4. The method of claim 1, wherein in step 3, the correlation coefficient is calculated as follows:
in the formula, xiThe time sequence data of A phase voltage, B phase voltage, C phase voltage or voltage difference time sequence data are acquired at i momentiTime sequence data of A phase voltage and B phase voltageThe time sequence data of the C-phase voltage, the time sequence data of the C-phase voltage or the voltage difference time sequence data i acquire values at the moment,
the time sequence data of A phase voltage, the time sequence data of B phase voltage, the time sequence data of C phase voltage or the average value of n acquisition points of the voltage difference time sequence data,
The time sequence data of the A phase voltage, the time sequence data of the B phase voltage, the time sequence data of the C phase voltage or the average value of n acquisition points of the voltage difference time sequence data.
5. The method for low-voltage treatment of the transformer area according to claim 1, wherein the step 3.1 comprises:
grouping the generated low-voltage events at the user side by day, sequencing the events based on the occurrence time of the low-voltage events, and analyzing the events in the low-voltage event group at the user side after the events are grouped by day;
and if the low voltage occurrence time interval between a certain user side low voltage event and another user side low voltage event in the group is more than 65 minutes, grouping again to divide the user side low voltage events into N groups.
6. The method of claim 1, wherein after step 3.3, the analyzing the cause of the event further comprises step 3.4:
judging whether the maximum value of the distribution room outlet three-phase voltage average value sequence during the generation period of a certain user side low-voltage event group is less than 207V or not;
and if the maximum value of the outlet three-phase voltage average value sequence of the transformer area during the generation period of a certain user side low-voltage event group is less than 207V, judging that the reason of the user side low-voltage event group is 10kV line fault.
7. The method of claim 1, wherein after step 3.3, the analyzing the cause of the event further comprises step 3.5:
judging whether the maximum value of the distribution area outlet three-phase voltage average value sequence is not less than 207V and whether the distribution transformer connection group is Yyn0 type during the generation period of a certain user side low-voltage event group;
and if the maximum value of the distribution area outlet three-phase voltage average value sequence during the generation period of a certain user-side low-voltage event group is not less than 207V and the distribution transformer connection group is Yyn0 type, determining that the reason of the user-side low-voltage event group is the distribution area three-phase imbalance fault.
8. The method of claim 1, wherein after step 3.3, the analyzing the cause of the event further comprises step 3.6:
judging whether the low voltage of the A-phase user sides of at least two users is different, the low voltage of the B-phase user sides of at least two users is different and the low voltage of the C-phase user sides of at least two users is different in a certain user side low voltage event group;
if the low voltage of the A-phase user sides of at least two users is different, the low voltage of the B-phase user sides of at least two users is different and the low voltage of the C-phase user sides of at least two users is different in a certain user side low voltage event group, determining that the reason of the user side low voltage event group is a low-voltage line fault;
and if the low voltage of the A-phase user side of at least two users is different, the low voltage of the B-phase user side of at least two users is different and the low voltage of the C-phase user side of at least two users is different do not exist in a certain user side low voltage event group, judging that the reason of the user side low voltage event group is the wiring fault of the user meter.
9. The method of claim 1, wherein the period of generation of the certain user-side low voltage event group is from the earliest time to the latest time.
10. A transformer area low voltage abatement system, comprising:
the acquisition module is configured to acquire station outlet data and user side data, wherein the station outlet data comprises station outlet three-phase voltage, station outlet three-phase current and distribution transformer tap switch gear data, and the user side data comprises user side low voltage;
a generating module configured to generate a user-side low voltage event according to the user-side data;
a determining module configured to analyze an event cause for the user-side low voltage event based on the station outlet data, wherein the event cause includes: sorting by low voltage occurrence time, and grouping the user side low voltage events based on time intervals; judging whether the distribution transformer gear is in a first gear or a second gear during the generation of a low-voltage event group at a certain user side according to the distribution transformer tapping switch gear data; if the gear of the distribution transformer is not in the first gear or the second gear during the generation period of a certain user-side low-voltage event group, acquiring the time sequence data of the outlet three-phase voltage of the transformer area and the time sequence data of the outlet three-phase current of the transformer area of the certain user-side low-voltage event group on the same day, subtracting the minimum value of the three-phase voltage from the maximum value of the three-phase voltage of each acquisition point on the same day to obtain voltage difference time sequence data, and subtracting the minimum value of the three-phase current from the maximum value of the three-phase current of each acquisition point; calculating correlation coefficients of three voltage sequences of a station area outlet A phase and B phase, B phase and C phase and A phase and C phase of a certain user side low-voltage event group on the same day, setting a first threshold of the correlation coefficients, and judging whether the minimum value in the correlation coefficients of the three voltage sequences is greater than the first threshold and whether the minimum value in voltage difference time sequence data during the generation of the certain user side low-voltage event group is less than 4V; if the minimum value of the three voltage sequence correlation coefficients is not greater than a first threshold value or the minimum value of the voltage difference time sequence data in the generation period of the certain user side low-voltage event group is not less than 4V, aligning the voltage difference time sequence data with the current difference time sequence data according to the acquisition time, calculating the correlation coefficients of the voltage difference time sequence data and the current difference time sequence data, setting a second threshold value of the correlation coefficients, and judging whether the correlation coefficients of the voltage difference time sequence data and the current difference time sequence data are greater than the second threshold value and whether the minimum value of the voltage difference time sequence data is less than 40V; and if the correlation coefficient of the voltage difference time sequence data and the current difference time sequence data is not larger than a second threshold value or the minimum value in the voltage difference time sequence data is not smaller than 40V, judging that the reason of the user side low-voltage event group is the fault of the platform area outlet defect.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110204400.4A CN112564110B (en) | 2021-02-24 | 2021-02-24 | Transformer area low-voltage treatment method and system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110204400.4A CN112564110B (en) | 2021-02-24 | 2021-02-24 | Transformer area low-voltage treatment method and system |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN112564110A CN112564110A (en) | 2021-03-26 |
| CN112564110B true CN112564110B (en) | 2021-07-02 |
Family
ID=75034650
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202110204400.4A Active CN112564110B (en) | 2021-02-24 | 2021-02-24 | Transformer area low-voltage treatment method and system |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN112564110B (en) |
Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113239097B (en) * | 2021-07-13 | 2021-12-10 | 国网江西省电力有限公司电力科学研究院 | Transformer area leakage potential safety hazard analysis method and system |
| CN113836108B (en) * | 2021-11-29 | 2023-08-18 | 国网江西省电力有限公司电力科学研究院 | Distribution network low-voltage problem management method and system based on big data |
| CN114629128B (en) * | 2022-05-16 | 2022-09-02 | 国网江西省电力有限公司电力科学研究院 | User low-voltage management method and system based on marketing and distribution data fusion |
Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107257135A (en) * | 2017-07-17 | 2017-10-17 | 国网江西省电力公司电力科学研究院 | Decision method, device and the equipment of a kind of uneven control measures in power distribution station |
| CN108183475A (en) * | 2017-12-27 | 2018-06-19 | 国网河南省电力公司电力科学研究院 | A kind of low-voltage network topology reconstruction method and device |
| CN109581130A (en) * | 2019-01-18 | 2019-04-05 | 国家电网有限公司 | A kind of voltage curve similarity calculating method for considering voltage regulating measures and influencing |
| CN109713671A (en) * | 2019-02-19 | 2019-05-03 | 国网江西省电力有限公司电力科学研究院 | Power distribution station O&M method, system, storage medium and electronic equipment |
| CN110137920A (en) * | 2019-05-17 | 2019-08-16 | 昆明理工大学 | A kind of MMC protection of direct current supply line method based on voltage dependence |
| WO2019180643A1 (en) * | 2018-03-20 | 2019-09-26 | Nexus Technologies, Inc. | Regulating the operating point of a power inverter |
| CN112329806A (en) * | 2020-09-01 | 2021-02-05 | 华南理工大学 | Ammeter clustering method for low-voltage distribution area topology identification |
-
2021
- 2021-02-24 CN CN202110204400.4A patent/CN112564110B/en active Active
Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107257135A (en) * | 2017-07-17 | 2017-10-17 | 国网江西省电力公司电力科学研究院 | Decision method, device and the equipment of a kind of uneven control measures in power distribution station |
| CN108183475A (en) * | 2017-12-27 | 2018-06-19 | 国网河南省电力公司电力科学研究院 | A kind of low-voltage network topology reconstruction method and device |
| WO2019180643A1 (en) * | 2018-03-20 | 2019-09-26 | Nexus Technologies, Inc. | Regulating the operating point of a power inverter |
| CN109581130A (en) * | 2019-01-18 | 2019-04-05 | 国家电网有限公司 | A kind of voltage curve similarity calculating method for considering voltage regulating measures and influencing |
| CN109713671A (en) * | 2019-02-19 | 2019-05-03 | 国网江西省电力有限公司电力科学研究院 | Power distribution station O&M method, system, storage medium and electronic equipment |
| CN110137920A (en) * | 2019-05-17 | 2019-08-16 | 昆明理工大学 | A kind of MMC protection of direct current supply line method based on voltage dependence |
| CN112329806A (en) * | 2020-09-01 | 2021-02-05 | 华南理工大学 | Ammeter clustering method for low-voltage distribution area topology identification |
Non-Patent Citations (1)
| Title |
|---|
| 配网主站***的配变运维关键技术分析;钱玉麟等;《电网与清洁能源》;20180228;第34卷(第2期);第36-42页 * |
Also Published As
| Publication number | Publication date |
|---|---|
| CN112564110A (en) | 2021-03-26 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN112564110B (en) | Transformer area low-voltage treatment method and system | |
| CN111026927B (en) | Low-voltage transformer area running state intelligent monitoring system | |
| CN109799474B (en) | Multi-epitope meter box electric energy meter phase identification method and system based on data correlation | |
| CN101958544A (en) | System and method for calculating line loss rate of electric power distribution line | |
| CN111817299B (en) | Fuzzy reasoning-based intelligent identification method for line loss rate abnormal cause of power distribution station | |
| CN113162033B (en) | Automatic identification method and system for topological relation of distribution network station based on frozen current | |
| Jabr et al. | Distribution management systems for smart grid: Architecture, work flows, and interoperability | |
| CN111244979A (en) | Three-phase unbalanced load adjustment method based on low-voltage distribution network power and power consumption | |
| CN113381408B (en) | Power utilization abnormity distribution transformer positioning method and device based on distribution automation data | |
| CN106655152B (en) | A kind of State Estimation for Distribution Network measuring characteristic based on AMI | |
| CN111398859B (en) | User low-voltage cause big data analysis method and system | |
| CN111130109B (en) | Yyn0 low-voltage power distribution network theoretical line loss calculation method and system | |
| CN106970347A (en) | A kind of method of utilization bus unbalance factor investigation transformer station kilowatt-hour meter secondary circuit failure | |
| CN110716091A (en) | Three-phase unbalance on-line monitoring method based on four-stage balance phase modulation algorithm | |
| CN115712811A (en) | Impedance calculation model based on low-voltage topological power distribution network | |
| CN113552527B (en) | Multi-table set line loss table determining device and line loss table determining method | |
| Zhang et al. | Distribution network topology identification considering nonsynchronous multi-prosumer data measurement | |
| CN113987848A (en) | Intelligent load composition identification and accurate load modeling method and system | |
| CN114287093A (en) | Method and system for estimating and monitoring power distribution network conditions | |
| CN113095970A (en) | 10kV feeder historical data simulation method and device | |
| CN111239480A (en) | Dyn11 low-voltage distribution network theoretical line loss calculation method and system | |
| Nagata et al. | Development of photovoltaic power generation output estimation method using distribution system sensor information | |
| CN116316712B (en) | Three-phase load intelligent cooperative regulation and control method based on electricity utilization characteristics | |
| CN112180157B (en) | Wind turbine generator generating capacity metering method and intelligent analysis method and system based on wind turbine generator generating capacity metering method | |
| Olivier | Solutions for Integrating Photovoltaic Panels Into Low-voltage Distribution Networks |
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 |