Centralized monitoring and analyzing method and system for equipment load at centralized control station side

Abstract

The invention discloses an equipment load centralized monitoring analysis method and system at a centralized control station side, and belongs to the technical field of electric power engineering. The method specifically comprises the steps that modeling is conducted on the equipment load rate of a centralized control side production control area, equipment data are collected, and the equipment load rate is calculated; setting a load rate limit value and a duration limit value of overload of the equipment, and performing overload early warning when the load rate of the equipment exceeds the set limit value; setting an N-1 early warning limit value of the equipment, and performing N-1 early warning when the total load of the transformer substation exceeds the N-1 early warning limit value of the rated capacity of the equipment; and according to the overload early warning and the N-1 early warning, constructing a monitoring model for visual display in combination with load rate statistics of a centralized control side production control area, then synchronizing the monitoring model to an information management area of the centralized control side in a cross-area manner, generating a visual intelligent report, and realizing centralized monitoring analysis of the equipment load of the centralized control station side. According to the invention, the load state analysis and lean management of important equipment are optimized, and the operation risk of the power grid is effectively prevented and reduced.

Description

Technical Field

[0001] The present invention belongs to the technical field of electric power engineering, and more specifically, relates to a centralized monitoring and analysis method for important equipment loads at a centralized control station. Background Art

[0002] With the construction of a new generation of centralized monitoring systems for substations, real-time data of the substation's main equipment, including active power, reactive power, current, and voltage, can be connected to the centralized control station through the master-substation communication protocol, providing a data basis for load rate analysis and heavy overload warning of important equipment.

[0003] Technical document 1 (CN116933010A) discloses a load rate analysis and evaluation method based on multi-source data fusion and deep learning, which predicts the load rate of the power system by establishing a load rate prediction model;

[0004] Technical document 2 (CN106199248A) discloses a method for realizing grid load visualization, which displays line load rate with regional geography, line layers, statistical charts and bar charts.

[0005] The typical shortcomings of the above-mentioned prior art documents are that they do not analyze the load conditions of the windings on each side of the transformer separately, and do not refine the load rate types (current load rate, active load rate, capacity load rate). The transformer load rate may appear in different winding measurements. It is possible that the capacity load does not exceed the limit, but the current load rate or the active load rate exceeds the limit. The prior art lacks overload warning and overload duration, and cannot provide timely warnings when the equipment is overloaded, exceeds the overload duration, and does not meet the N-1 warning specifications. The lack of refined management of equipment load conditions can easily cause irreversible equipment overload damage accidents. Summary of the invention

[0006] In order to solve the deficiencies in the prior art, the present invention provides a centralized monitoring and analysis method for the load of important equipment at the centralized control station side. The method includes load rate modeling, load rate calculation, overload analysis, load rate statistics, N-1 early warning analysis, data storage, visual display, cross-region synchronization and intelligent reporting of transformers, AC lines and feeder equipment.

[0007] The present invention adopts the following technical solution.

[0008] The first aspect of the present invention provides a centralized monitoring and analysis method for equipment load at a centralized control station, comprising:

[0009] Model the equipment load rate in the production control area of ​​the centralized control side, collect equipment data, and obtain the equipment load rate model and equipment data;

[0010] Calculate the equipment load rate according to the equipment load rate model and equipment data;

[0011] Set the load rate limit and duration limit for equipment overload. When the equipment load rate exceeds the set limit, the equipment is judged to be overloaded and an overload warning is issued;

[0012] Set the N-1 warning limit of the equipment. When the total load of the substation exceeds the N-1 warning limit of the equipment rated capacity, it is determined that the corresponding equipment load rate does not meet the N-1 warning rule and an N-1 warning is issued;

[0013] According to the overload warning and N-1 warning, combined with the load rate statistics of the production control area on the centralized control side, a monitoring model is constructed for visual display. The monitoring model is then synchronized across areas to the information management area on the centralized control side to generate visual intelligent reports, thereby realizing centralized monitoring and analysis of equipment load on the centralized control station side.

[0014] Preferably, the load rate of the equipment is modeled, specifically including:

[0015] Create the load factor of each winding on each side of the transformer, including the capacity load factor, active load factor and current load factor of each winding on each side of the transformer;

[0016] Create the current load factor of the AC line;

[0017] Create the current load factor for the feeder equipment.

[0018] Preferably, the data of the equipment includes basic ledger data and basic real-time data, and the basic ledger data includes the rated active power of the windings on each side of the transformer, the rated current of the windings on each side of the transformer, the rated apparent power of the windings on each side of the transformer, the maximum allowable current of the AC line, and the maximum allowable current of the feeder equipment;

[0019] The basic real-time data includes the real-time apparent power of the windings on each side of the transformer, the real-time active power of the windings on each side of the transformer, the real-time current of the windings on each side of the transformer, the real-time three-phase current of the AC line and the real-time three-phase current of the feeding line.

[0020] Preferably, according to the real-time data collected from the windings on each side of the transformer, the capacity load rate, active load rate and current load rate of the windings on each side of the transformer are calculated in real time, specifically including:

[0021] The real-time capacity load rate of the windings on each side of the transformer = the real-time apparent power of the windings on each side of the transformer / the rated apparent power of the windings on each side of the transformer * 100%;

[0022] The real-time active load rate of the windings on each side of the transformer = the real-time active power of the windings on each side of the transformer / the rated active power of the windings on each side of the transformer*100%;

[0023] The real-time current load rate of the windings on each side of the transformer = the current of the windings on each side of the transformer / the rated current of the windings on each side of the transformer*100%.

[0024] Preferably, the current load rate of the AC line and the current load rate of the feeder line are calculated in real time according to the real-time data collected by the AC line and the real-time data collected by the feeder line, specifically including:

[0025] The real-time current load rate of the AC line = the real-time maximum three-phase current of the AC line / the maximum allowable current of the AC line * 100%, where the maximum allowable current is corrected according to the rated current of the AC line * the ambient temperature correction factor, and different correction factors are set according to different seasons;

[0026] The real-time current load rate of the feeder line = the real-time three-phase maximum current of the feeder line / the maximum allowable current of the feeder line*100%.

[0027] Preferably, the transformer overload state includes normal, general overload, severe overload and overload, and the corresponding transformer overload state limit and overload duration limit of the capacity load rate, active load rate and current load rate of the windings on each side of the transformer are set. When the corresponding load rate of the windings on each side of the transformer exceeds the overload limit in the transformer overload state for the first time, and the overload duration exceeds the corresponding overload duration limit of the transformer, the transformer is determined to be overloaded;

[0028] The AC line heavy load state includes normal, general heavy load, severe heavy load and overload. The AC line heavy load state limit and overload duration limit of the current load rate of the AC line are set. When the current load rate of the AC line exceeds the overload limit in the AC line heavy load state for the first time and the overload duration exceeds the AC line overload duration limit, the AC line is determined to be overloaded.

[0029] The feeder line heavy load status includes normal, light heavy load, general heavy load, severe heavy load and overload. The feeder line heavy load status limit and overload duration limit of the current load rate of the feeder line are set. When the current load rate of the feeder line exceeds the overload limit in the feeder line heavy load status for the first time and the overload duration exceeds the feeder line overload duration limit, the feeder line is determined to be overloaded.

[0030] Preferably, when the load level of any substation exceeds the N-1 warning limit of the rated capacity of any transformer under the substation, it is determined that the corresponding transformer load rate does not meet the N-1 warning rule, and an N-1 warning is issued;

[0031] If the load level of any substation exceeds the N-1 warning limit of the rated capacity of any AC line under the substation, it is determined that the current load rate of the corresponding AC line does not meet the N-1 warning rule and an N-1 warning is issued;

[0032] If the load level of any substation exceeds the N-1 warning limit of the rated capacity of any feeder line under the substation, it is determined that the current load rate of the corresponding feeder line does not meet the N-1 warning rule and an N-1 warning is issued.

[0033] Preferably, the load rate statistics include real-time load rate statistics and historical load rate statistics;

[0034] The real-time load rate statistics include the responsibility area and responsibility area level statistics of the production control area on the centralized control side, the number of different types of equipment in different equipment load rate overload states and the duration of different equipment load rate overload states, as well as the statistics of the equipment load rate of each responsibility area;

[0035] The historical load rate statistics are based on years, months, weeks and days as the period, and statistics the maximum value information of the load rate of different types of equipment, including the maximum value, maximum value time, minimum value, minimum value time, average value and peak-to-valley value of the equipment load rate.

[0036] Preferably, the visual display of the load rate includes bar graphs, curves and tables, specifically including:

[0037] Use load rate bar graphs to display the real-time value of load rate, heavy load limit and overload limit;

[0038] Select the bar graph to view the real-time and historical curves of the load rate for the day, showing the changing trend of the load rate;

[0039] The table shows the load rate values ​​and maximum value information at each moment, where the maximum value statistics include maximum load rate, maximum load rate moment, minimum load rate, minimum load rate moment, average value and peak-to-valley difference.

[0040] The second aspect of the present invention provides a centralized monitoring and analysis system for equipment load at a centralized control station side, which runs the centralized monitoring and analysis method for equipment load at a centralized control station side described in the first aspect, comprising:

[0041] Data acquisition module: used to model the equipment load rate in the production control area of ​​the centralized control side and collect equipment data to obtain the equipment load rate model and equipment data;

[0042] Load rate solution module: used to calculate the equipment load rate based on the equipment load rate model and equipment data;

[0043] Overload warning module: used to set the load rate limit and duration limit of equipment overload. When the equipment load rate exceeds the set limit, the equipment is judged to be overloaded and an overload warning is issued;

[0044] N-1 warning module: used to set the N-1 warning limit of the equipment. When the total load of the substation exceeds the N-1 warning limit of the rated capacity of the equipment, it is determined that the corresponding equipment load rate does not meet the N-1 warning rule and an N-1 warning is issued;

[0045] Visualization module: It is used to build a monitoring model for visualization based on overload warning and N-1 warning, combined with the load rate statistics of the production control area on the centralized control side. The monitoring model is then synchronized across areas to the information management area on the centralized control side to generate visual intelligent reports, thus realizing centralized monitoring and analysis of equipment load on the centralized control station side.

[0046] Compared with the prior art, the beneficial effects of the present invention include at least: a centralized monitoring and analysis method for the load of important equipment on the centralized control station side provided by the present invention can issue an immediate warning when overload and load rate do not meet the N-1 warning specification, notify the user to take measures in advance, and assist operation and maintenance monitoring personnel to discover abnormal equipment load problems as early as possible through centralized monitoring and analysis of the load of important equipment, and deal with them in time to avoid the occurrence of safety hazards, prevent irreversible failures of equipment, and effectively prevent and reduce the operation risks of the power grid; display the real-time load rate and historical load rate in a visual way such as tables, curves and modeling plug-ins, which helps monitoring personnel to centrally monitor the load changes of transformers, AC lines and feeder equipment and take timely measures, and prompt the overload of important equipment based on alarm prompts, visualization and important warning means, and automatically generate reports, which is conducive to load status analysis and lean management of important equipment. BRIEF DESCRIPTION OF THE DRAWINGS

[0047] Figure 1 It is a functional structure diagram of a centralized monitoring and analysis method for important equipment loads at a centralized control station provided in accordance with an embodiment of the present invention;

[0048] Figure 2 The present invention is a flowchart of an algorithm for analyzing the overload of important equipment at a centralized control station provided in accordance with an embodiment of the present invention. DETAILED DESCRIPTION

[0049] In order to make the purpose, technical scheme and advantages of the present invention clearer, the technical scheme of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. The described embodiments are only embodiments of a part of the present invention, not all embodiments. Based on the spirit of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work belong to the protection scope of the present invention.

[0050] like Figure 1As shown, embodiment 1 of the present invention provides a centralized monitoring and analysis method for the load of important equipment on the centralized control station side, including load rate modeling, load rate calculation, overload analysis, load rate statistics, N-1 early warning analysis, data storage, visualization, cross-region synchronization and intelligent reporting of transformers, AC lines and feeder equipment. Specifically, the following steps are included: Step 1, modeling the equipment load rate in the production control area of ​​the centralized control side, and collecting equipment data to obtain the equipment load rate model and equipment data;

[0051] Preferably, but not limited to, load rate modeling includes:

[0052] The safety zone I of the centralized control system models the load rate of important equipment and creates different categories of load rate measurement points according to different equipment types.

[0053] Among them, important equipment includes transformers, AC lines and feeder lines. The specific important equipment load rate modeling includes:

[0054] For the transformer, the capacity load rate, active load rate and current load rate of the windings on each side of the transformer are created, collectively referred to as the load rate of the windings on each side of the transformer;

[0055] For AC lines, create the current load factor of the AC lines;

[0056] For feeder lines, create the current load factor of the feeder equipment.

[0057] The modeling method of load rate measurement points can be batch created according to the important equipment measurement point template, or the measurement point model of the relevant load rate can be created first, and then the measurement point can be associated with the corresponding equipment.

[0058] The equipment data includes basic ledger data and basic real-time data.

[0059] Read the basic ledger data of the equipment, including the rated active power, rated current, and rated apparent power of the windings on each side of the transformer; the maximum allowable current of the AC line; and the maximum allowable current of the feeder equipment;

[0060] Preferably, but not limited to, the basic real-time data of the equipment is collected, including:

[0061] The real-time data (active power, reactive power, current, voltage) of equipment in multiple substations are connected to the centralized control station for centralized monitoring and analysis of the load rate of AC lines, transformers and feeder equipment.

[0062] Data collection and processing are carried out. The centralized control station communicates with the substation gateway machine and collects basic real-time data of the equipment for load rate analysis through the master-substation protocol interface. The basic data include the real-time apparent power of the windings on each side of the transformer, the real-time active power of the windings on each side of the transformer, the real-time current of the windings on each side of the transformer, the real-time three-phase current of the AC line and the real-time telemetry of the real-time three-phase current of the feeder line.

[0063] Step 2: Calculate the equipment load rate based on the equipment load rate model and equipment data.

[0064] Read the real-time collected data of important equipment and calculate the real-time load rate according to the calculation formulas of different types of load rates;

[0065] Preferably, but not limitatively, the real-time calculation of the load factor includes: the real-time calculation of the load factor of the windings on each side of the transformer, the load factor of the AC line and the load factor of the feeder line.

[0066] Real-time calculation of different types of transformer load rates. Based on the actual active, reactive and current data collected from the windings on each side of the transformer, the capacity load rate, active load rate and current load rate of the windings on each side of the transformer are calculated in real time.

[0067] The real-time capacity load rate of the windings on each side of the transformer is expressed by the following formula:

[0068] Among them, the real-time capacity load rate of the windings on each side of the transformer = the real-time apparent power of the windings on each side of the transformer / the rated apparent power of the windings on each side of the transformer*100%, the real-time active load rate of the windings on each side of the transformer = the real-time active power of the windings on each side of the transformer / the rated active power of the windings on each side of the transformer*100%, and the real-time current load rate of the windings on each side of the transformer = the current of the windings on each side of the transformer / the rated current of the windings on each side of the transformer*100%.

[0069] The current load rate of the AC line is the percentage of the actual three-phase maximum current of the AC line to the allowable current carrying capacity of the AC line. The maximum allowable current can be corrected according to the ambient temperature by the rated current of the AC line * the ambient temperature correction factor. The current carrying capacity supports different correction factors for different seasons. The real-time current load rate of the AC line = the real-time three-phase maximum current of the AC line / the maximum allowable current of the AC line * 100%.

[0070] The current load rate of the feeder line is the percentage of the actual collected three-phase maximum current of the feeder line and the allowable current carrying capacity of the feeder line. The real-time current load rate of the feeder line = the real-time three-phase maximum current of the feeder line / the allowable current carrying capacity of the feeder line * 100%.

[0071] Step 3: Set the load rate limit and duration limit of the equipment overload. When the equipment load rate exceeds the set limit, the equipment is determined to be overloaded and an overload warning is issued.

[0072] Read the overload limit data of important equipment, including the load rate limit and duration limit of each level of overload for different equipment. The overload limit supports fixed coefficient algorithm, limit group algorithm for equipment telemetry, load rate measurement point limit group algorithm, and one-key switching of limits for different seasons.

[0073] Equipment overload is usually divided into five levels: normal, light load, general overload, severe overload, and overload. The number of equipment overload levels, overload limits of each level, and duration limits can be flexibly set for different equipment.

[0074] The overload analysis and judgment of important equipment compares the real-time load rate with the overload limits of different levels, and analyzes from normal, light load, general overload, severe overload, and overload in turn. If the real-time load rate is greater than the overload limit for the first time, the start time of the first overload of this level is recorded. If the level still exceeds the limit during the iterative calculation cycle, the duration of the overload of this level is updated. If it is greater than the duration limit, the equipment at this level is considered to be overloaded, and an overload alarm of the corresponding level is sent. If there is no limit exceeding or the value does not reach the duration limit during the iterative calculation cycle, the data of this round is cleared and the next round of analysis is performed.

[0075] In a preferred but non-restrictive embodiment of the present invention, the overload analysis of important equipment includes: setting an overload limit and a duration limit for the overload of the equipment, comparing the real-time load rate of the AC line, transformer and feeder line with the overload limit, and if the overload limit is exceeded for the first time and the overload duration exceeds the duration limit, the equipment is considered to be overloaded. Further preferably but not restrictively, the transformer overload state includes normal, general overload, severe overload and overload, and the corresponding transformer overload state limit and overload duration limit are set for the capacity load rate, active load rate and current load rate of the windings on each side of the transformer, and when the corresponding load rate of the windings on each side of the transformer exceeds the overload limit in the transformer overload state for the first time, and the overload duration exceeds the corresponding overload duration limit of the transformer, the transformer is determined to be overloaded;

[0076] The transformer overload is set to four levels by default, with a load rate of 0-80% (settable) as normal, a load rate of 80%-90% (settable) as general overload, a load rate of 90%-100% (settable) as severe overload, and a load rate exceeding 100% (settable) as overload. If the load rate is overloaded for the first time and lasts for more than 2 hours (settable), the transformer is considered overloaded.

[0077] The AC line heavy load state includes normal, general heavy load, severe heavy load and overload. The AC line heavy load state limit and overload duration limit of the current load rate of the AC line are set. When the current load rate of the AC line exceeds the overload limit in the AC line heavy load state for the first time and the overload duration exceeds the AC line overload duration limit, the AC line is determined to be overloaded.

[0078] There are four levels of AC line overload by default, load rate 0-80% (settable) is normal, load rate 80%-90% (settable) is general overload, load rate 90%-100% (settable) is severe overload, load rate over 100% (settable) is overload. If the load rate is overloaded for the first time and lasts for more than 1 hour, the line is considered overloaded.

[0079] The feeder line heavy load status includes normal, light heavy load, general heavy load, severe heavy load and overload. The feeder line heavy load status limit and overload duration limit of the current load rate of the feeder line are set. When the current load rate of the feeder line exceeds the overload limit in the feeder line heavy load status for the first time and the overload duration exceeds the feeder line overload duration limit, the feeder line is determined to be overloaded.

[0080] There are five default settings for feeder line overload: load rate 0-70% (settable) is normal, load rate 70%-80% (settable) is light overload, load rate 80%-90% (settable) is general overload, load rate 90%-100% (settable) is severe overload, load rate exceeding 100% (settable) is overload. If the load rate is overloaded for the first time and lasts for more than 1 hour (settable), the feeder line is considered to be overloaded.

[0081] like Figure 2 As shown, the overload process includes: reading the load rate measurement point model and basic ledger data of the important equipment in step 1, reading the set overload limit data of the important equipment, analyzing and judging the overload of the important equipment based on the real-time calculation result of the load rate in step 2, counting the number of overloads of the important equipment, and visually displaying it in the load rate statistics in step 5.

[0082] Step 4: Set the N-1 warning limit of the equipment. When the total load of the substation exceeds the N-1 warning limit of the rated capacity of the equipment, it is determined that the corresponding equipment load rate does not meet the N-1 warning rule and an N-1 warning is issued.

[0083] Preferably, but not limited to, the N-1 early warning analysis of important equipment load includes:

[0084] When the load level of any substation exceeds 120% (the limit can be set) of the rated capacity of any transformer under the plant, it is determined that the corresponding transformer load rate does not meet the N-1 warning rule, and an N-1 warning is issued; when the load level of any substation exceeds 100% (the limit can be set) of the rated capacity of any AC line under the plant, it is determined that the current load rate of the corresponding AC line does not meet the N-1 warning rule, and an N-1 warning is issued; when the load level of any substation exceeds the N-1 warning limit of the rated capacity of any feeder line under the plant, it is determined that the current load rate of the corresponding feeder line does not meet the N-1 warning rule, and an N-1 warning is issued, giving a warning prompt that the equipment load N-1 does not meet the requirements.

[0085] The total load in the N-1 warning is calculated based on the load of each incoming line of the substation; when the capacity load rate of transformer N-1 equivalent to a single transformer exceeds 120%, a warning is issued; when the current load rate of a single incoming line exceeds 100%, a warning is issued.

[0086] Further but not restrictively, for the N-1 early warning analysis of transformer equipment, the measured values ​​of active power and reactive power of each incoming line according to the substation statistics are read, the real-time value of apparent power of each substation is calculated, and compared with the rated apparent power of any transformer in the substation. If the equipment limit ratio is exceeded, it is indicated that the transformer of the substation does not meet the N-1 operating rules.

[0087] If device N-1 does not meet the warning, the monitor can be reminded to pay close attention to the equipment load and exit the automatic protection function of the equipment in time to prevent the automatic action after the equipment trips and a single transformer or a single incoming line from supplying power to the entire station load, causing irreversible equipment overload damage accidents.

[0088] Step 5: Based on the overload warning and N-1 warning, a monitoring model is constructed in combination with the load rate statistics of the production control area on the centralized control side for visual display. The monitoring model is then synchronized across areas to the information management area on the centralized control side to generate a visual intelligent report to achieve centralized monitoring and analysis of equipment load on the centralized control station side.

[0089] Statistics on the number of overloads of important equipment. Supports statistics on the normal number, light load number, general overload number, severe overload number, overload number of different types of important equipment in the responsible area of ​​the production control area on the centralized control side, as well as the details of the equipment load rate at each level, for percentage statistics and classified centralized monitoring.

[0090] Preferably but not limitatively, the load rate statistics specifically include real-time load rate statistics and historical load rate statistics.

[0091] Among them, real-time load rate statistics are divided into responsibility areas and levels to count the normal number, light load number, general heavy load number, serious heavy load number, overload number of different types of important equipment, as well as the load rate details of each level of equipment, which are used for percentage statistics and classified centralized monitoring.

[0092] Among them, historical load rate statistics are based on years, months, weeks and days as periods, and statistics on the maximum value information of different types of load rates, including maximum value, maximum value moment, minimum value, minimum value moment, average value, and peak and valley values; statistics on overload information include the number of overload levels and duration of different types of load rates.

[0093] In a preferred but non-limiting embodiment, the load rates of important equipment are visualized and intuitively displayed in the form of bar graphs, curves, and tables.

[0094] Specifically, the load rate bar chart displays the real-time value, heavy load limit, and overload limit of the load rate; by selecting the element, you can view the real-time curve and historical curve of the load rate for the day, showing the changing trend of the load rate; in a tabular form, the load rate value and maximum value information at each moment are displayed.

[0095] In a further but non-limiting embodiment, the equipment load is centrally monitored, and the load status of important equipment can be centrally displayed by voltage level, equipment type, and load rate type. By associating the load rate measurement point model, the load rate bar graph can be in green, yellow, and red to intuitively display the real-time load rate and overload status of the equipment, where green indicates normal, yellow indicates overload, and red indicates overload.

[0096] Right click on the bar graph to view the real-time curve and historical curve of the load rate. The real-time curve shows the load rate change curve from 0:00 on the day to the current moment, and can switch to display the current load rate, active load rate and capacity load rate. The historical curve can be queried by day, month and year. The data sampling interval defaults to 1 minute, and the time interval can be set flexibly. The real-time curve and historical curve support the load rate curve comparison function at different time points on the same screen. The added curve measurement points can be deleted. The horizontal and vertical coordinate scales of the curve should be fine, the span should be small, and it should change with the value, with the maximum value, maximum value moment, minimum value, minimum value moment, average value, and peak-to-valley difference numerical display.

[0097] Right-click on the bar chart to display the load rate in table form, showing the load rate value of the day, arranged from large to small, showing overload warnings and duration, and supporting data export.

[0098] Load rate data storage, data of various types of load rates of transformers, AC lines and feeder equipment, can be independently configured for historical data storage, and the storage time interval can be flexibly set for curve display, trend analysis and historical statistics.

[0099] In a preferred but non-limiting embodiment, the load rate of important equipment is synchronized across zones to the centralized control system safety zone IV for automatic report analysis, including load rate measurement point models of transformers, AC lines and feeder equipment, real-time load, historical load, overload events, and overload duration information synchronization.

[0100] Specifically, the load rate measurement point model, real-time load, and real-time overload information are synchronized across zones through model synchronization and real-time synchronization interfaces. The historical load rate is synchronized across zones asynchronously to ensure the consistency of the load rate and overload data of the safety zone I and safety zone IV of the centralized control system.

[0101] In a preferred but non-limiting embodiment, the load rate intelligent report includes a real-time report and a historical report. The load rate real-time report can query and display the real-time load rate of important equipment at the current moment, whether it is overloaded, the overload duration and other information, and supports filtering and querying by responsibility area, equipment type, voltage level, and load rate type. The historical report supports overload reports by year, month, week, and day, and the overload content includes capacity load rate, active load rate, and current load rate.

[0102] In a further but non-limiting embodiment, the transformer overload report displays content including substation, voltage level, equipment name, maximum load rate (capacity), maximum load rate moment (capacity), maximum apparent power, transformer rated capacity, capacity load overload duration, capacity load overload duration; maximum load rate (current), maximum load rate moment (current), maximum current, maximum current, current overload duration, current overload duration; maximum load rate (active power), maximum load rate moment (active power), active power maximum value, rated active power, active overload duration, active overload duration.

[0103] Among them, the overload report of AC lines and feeder equipment includes substation, voltage level, equipment name, maximum load rate (current), maximum load rate time (current), maximum current, maximum current, current overload duration, and current overload duration.

[0104] Compared with the prior art, the beneficial effects of the present invention include at least: a centralized monitoring and analysis method for the load of important equipment on the centralized control station side provided by the present invention can issue an immediate warning when overload and load rate do not meet the N-1 warning specification, notify the user to take measures in advance, and assist operation and maintenance monitoring personnel to discover abnormal equipment load problems early through centralized monitoring and analysis of important equipment loads, and deal with them in time to avoid the occurrence of safety hazards, prevent irreversible failures of equipment, and effectively prevent and reduce the operation risks of the power grid; display the real-time load rate and historical load rate in a visual way such as a table, which helps monitoring personnel to centrally monitor the load changes of transformers, AC lines and feeder equipment and take timely measures, prompt the overload of important equipment based on alarm prompts, visualization, and important warning means, and automatically generate reports, which is conducive to load status analysis and lean management of important equipment.

[0105] Embodiment 2 of the present invention provides a centralized monitoring and analysis system for equipment load at a centralized control station side, and runs a centralized monitoring and analysis method for equipment load at a centralized control station side described in embodiment 1, including:

[0106] Data acquisition module: used to model the equipment load rate in the production control area of ​​the centralized control side and collect equipment data to obtain the equipment load rate model and equipment data;

[0107] Load rate solution module: used to calculate the equipment load rate based on the equipment load rate model and equipment data;

[0108] Overload warning module: used to set the load rate limit and duration limit of equipment overload. When the equipment load rate exceeds the set limit, the equipment is judged to be overloaded and an overload warning is issued;

[0109] N-1 warning module: used to set the N-1 warning limit of the equipment. When the total load of the substation exceeds the N-1 warning limit of the rated capacity of the equipment, it is determined that the corresponding equipment load rate does not meet the N-1 warning rule and an N-1 warning is issued;

[0110] Visualization module: It is used to build a monitoring model for visualization based on overload warning and N-1 warning, combined with the load rate statistics of the production control area on the centralized control side. The monitoring model is then synchronized across areas to the information management area on the centralized control side to generate visual intelligent reports, thus realizing centralized monitoring and analysis of equipment load on the centralized control station side.

[0111] The present disclosure may be a system, a method and / or a computer program product. The computer program product may include a computer-readable storage medium carrying computer-readable program instructions for causing a processor to implement various aspects of the present disclosure.

[0112] A computer-readable storage medium may be a tangible device that can hold and store instructions used by an instruction execution device. A computer-readable storage medium may be, for example, but not limited to, an electrical storage device, a magnetic storage device, an optical storage device, an electromagnetic storage device, a semiconductor storage device, or any suitable combination of the foregoing. More specific examples of computer-readable storage media (a non-exhaustive list) include: a portable computer disk, a hard disk, a random access memory (RAM), a read-only memory (ROM), an erasable programmable read-only memory (EPROM or flash memory), a static random access memory (SRAM), a portable compact disk read-only memory (CD-ROM), a digital versatile disk (DVD), a memory stick, a floppy disk, a mechanical encoding device, such as a punch card or a raised structure in a groove on which instructions are stored, and any suitable combination of the foregoing. As used herein, a computer-readable storage medium is not to be interpreted as a transient signal per se, such as a radio wave or other freely propagating electromagnetic wave, an electromagnetic wave propagating through a waveguide or other transmission medium (e.g., a light pulse through a fiber optic cable), or an electrical signal transmitted through a wire.

[0113] The computer-readable program instructions described herein can be downloaded from a computer-readable storage medium to each computing / processing device, or downloaded to an external computer or external storage device via a network, such as the Internet, a local area network, a wide area network, and / or a wireless network. The network can include copper transmission cables, optical fiber transmissions, wireless transmissions, routers, firewalls, switches, gateway computers, and / or edge servers. The network adapter card or network interface in each computing / processing device receives the computer-readable program instructions from the network and forwards the computer-readable program instructions for storage in the computer-readable storage medium in each computing / processing device.

[0114] The computer program instructions for performing the operation of the present disclosure may be assembly instructions, instruction set architecture (ISA) instructions, machine instructions, machine-related instructions, microcode, firmware instructions, state setting data, or source code or object code written in any combination of one or more programming languages, including object-oriented programming languages, such as Smalltalk, C++, etc., and conventional procedural programming languages, such as "C" language or similar programming languages. Computer-readable program instructions may be executed completely on a user's computer, partially on a user's computer, as an independent software package, partially on a user's computer, partially on a remote computer, or completely on a remote computer or server. In the case of a remote computer, the remote computer may be connected to the user's computer via any type of network, including a local area network (LAN) or a wide area network (WAN), or may be connected to an external computer (e.g., using an Internet service provider to connect via the Internet). In some embodiments, an electronic circuit, such as a programmable logic circuit, a field programmable gate array (FPGA), or a programmable logic array (PLA), may be customized by utilizing the state information of the computer-readable program instructions, and the electronic circuit may execute the computer-readable program instructions, thereby realizing various aspects of the present disclosure.

[0115] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention rather than to limit it. Although the present invention has been described in detail with reference to the above embodiments, ordinary technicians in the relevant field should understand that the specific implementation methods of the present invention can still be modified or replaced by equivalents, and any modifications or equivalent replacements that do not depart from the spirit and scope of the present invention should be covered within the scope of protection of the claims of the present invention.

Claims

1. A centralized monitoring and analysis method for equipment load at a centralized control station, characterized in that: Model the equipment load rate in the production control area of ​​the centralized control side, collect equipment data, and obtain the equipment load rate model and equipment data; Calculate the equipment load rate according to the equipment load rate model and equipment data; Set the load rate limit and duration limit for equipment overload. When the equipment load rate exceeds the set limit, the equipment is judged to be overloaded and an overload warning is issued; Set the N-1 warning limit of the equipment. When the total load of the substation exceeds the N-1 warning limit of the equipment rated capacity, it is determined that the corresponding equipment load rate does not meet the N-1 warning rule and an N-1 warning is issued; According to the overload warning and N-1 warning, combined with the load rate statistics of the production control area on the centralized control side, a monitoring model is constructed for visual display. The monitoring model is then synchronized across areas to the information management area on the centralized control side to generate visual intelligent reports, thereby realizing centralized monitoring and analysis of equipment load on the centralized control station side.

2. According to claim 1, a centralized monitoring and analysis method for equipment load at a centralized control station side is characterized by: Model the load factor of the equipment, including: Create the load factor of each winding on each side of the transformer, including the capacity load factor, active load factor and current load factor of each winding on each side of the transformer; Create the current load factor of the AC line; Create the current load factor for the feeder equipment.

3. According to claim 1, a centralized monitoring and analysis method for equipment load at a centralized control station side is characterized by: The equipment data includes basic ledger data and basic real-time data. The basic ledger data includes the rated active power of the windings on each side of the transformer, the rated current of the windings on each side of the transformer, the rated apparent power of the windings on each side of the transformer, the maximum allowable current of the AC line, and the maximum allowable current of the feeder equipment. The basic real-time data includes the real-time apparent power of the windings on each side of the transformer, the real-time active power of the windings on each side of the transformer, the real-time current of the windings on each side of the transformer, the real-time three-phase current of the AC line and the real-time three-phase current of the feeding line.

4. According to claim 1, a centralized monitoring and analysis method for equipment load at a centralized control station side is characterized by: According to the real-time data collected from the windings on each side of the transformer, the capacity load rate, active load rate and current load rate of the windings on each side of the transformer are calculated in real time, including: The real-time capacity load rate of the windings on each side of the transformer = the real-time apparent power of the windings on each side of the transformer / the rated apparent power of the windings on each side of the transformer * 100%; The real-time active load rate of the windings on each side of the transformer = the real-time active power of the windings on each side of the transformer / the rated active power of the windings on each side of the transformer*100%; The real-time current load rate of the windings on each side of the transformer = the current of the windings on each side of the transformer / the rated current of the windings on each side of the transformer*100%.

5. According to claim 1, a centralized monitoring and analysis method for equipment load at a centralized control station side is characterized by: According to the real-time data collected from the AC line and the real-time data collected from the feeder line, the current load rate of the AC line and the current load rate of the feeder line are calculated in real time, including: The real-time current load rate of the AC line = the real-time maximum three-phase current of the AC line / the maximum allowable current of the AC line * 100%, where the maximum allowable current is corrected according to the rated current of the AC line * the ambient temperature correction factor, and different correction factors are set according to different seasons; The real-time current load rate of the feeder line = the real-time three-phase maximum current of the feeder line / the maximum allowable current of the feeder line*100%.

6. According to claim 1, a centralized monitoring and analysis method for equipment load at a centralized control station side is characterized by: The transformer overload status includes normal, general overload, severe overload and overload. The corresponding transformer overload status limit and overload duration limit are set for the capacity load rate, active load rate and current load rate of the windings on each side of the transformer. When the corresponding load rate of the windings on each side of the transformer exceeds the overload limit in the transformer overload status for the first time, and the overload duration exceeds the corresponding overload duration limit of the transformer, the transformer is judged to be overloaded. The AC line heavy load state includes normal, general heavy load, severe heavy load and overload. The AC line heavy load state limit and overload duration limit of the current load rate of the AC line are set. When the current load rate of the AC line exceeds the overload limit in the AC line heavy load state for the first time and the overload duration exceeds the AC line overload duration limit, the AC line is determined to be overloaded. The feeder line heavy load status includes normal, light heavy load, general heavy load, severe heavy load and overload. The feeder line heavy load status limit and overload duration limit of the current load rate of the feeder line are set. When the current load rate of the feeder line exceeds the overload limit in the feeder line heavy load status for the first time and the overload duration exceeds the feeder line overload duration limit, the feeder line is determined to be overloaded.

7. According to claim 1, a centralized monitoring and analysis method for equipment load at a centralized control station side is characterized by: When the load level of any substation exceeds the N-1 warning limit of the rated capacity of any transformer under the substation, it is determined that the corresponding transformer load rate does not meet the N-1 warning rule and an N-1 warning is issued; If the load level of any substation exceeds the N-1 warning limit of the rated capacity of any AC line under the substation, it is determined that the current load rate of the corresponding AC line does not meet the N-1 warning rule and an N-1 warning is issued; If the load level of any substation exceeds the N-1 warning limit of the rated capacity of any feeder line under the substation, it is determined that the current load rate of the corresponding feeder line does not meet the N-1 warning rule and an N-1 warning is issued.

8. According to claim 1, a centralized monitoring and analysis method for equipment load at a centralized control station side is characterized by: Load rate statistics include real-time load rate statistics and historical load rate statistics; The real-time load rate statistics include the responsibility area and responsibility area level statistics of the production control area on the centralized control side, the number of different types of equipment in different equipment load rate overload states and the duration of different equipment load rate overload states, as well as the statistics of the equipment load rate of each responsibility area; The historical load rate statistics are based on years, months, weeks and days as the period, and statistics the maximum value information of the load rate of different types of equipment, including the maximum value, maximum value time, minimum value, minimum value time, average value and peak-to-valley value of the equipment load rate.

9. According to claim 1, a centralized monitoring and analysis method for equipment load at a centralized control station side is characterized by: The load rate visualization includes bar graphs, curves, and tables, including: Use load rate bar graphs to display the real-time value of load rate, heavy load limit and overload limit; Select the bar graph to view the real-time and historical curves of the load rate for the day, showing the changing trend of the load rate; The table shows the load rate values ​​and maximum value information at each moment, where the maximum value statistics include maximum load rate, maximum load rate moment, minimum load rate, minimum load rate moment, average value and peak-to-valley difference.

10. A centralized monitoring and analysis system for equipment load at a centralized control station, running a centralized monitoring and analysis method for equipment load at a centralized control station according to any one of claims 1 to 9, characterized in that: Data acquisition module: used to model the equipment load rate in the production control area of ​​the centralized control side and collect equipment data to obtain the equipment load rate model and equipment data; Load rate solution module: used to calculate the equipment load rate based on the equipment load rate model and equipment data; Overload warning module: used to set the load rate limit and duration limit of equipment overload. When the equipment load rate exceeds the set limit, the equipment is judged to be overloaded and an overload warning is issued; N-1 warning module: used to set the N-1 warning limit of the equipment. When the total load of the substation exceeds the N-1 warning limit of the rated capacity of the equipment, it is determined that the corresponding equipment load rate does not meet the N-1 warning rule and an N-1 warning is issued; Visualization module: It is used to build a monitoring model for visualization based on overload warning and N-1 warning, combined with the load rate statistics of the production control area on the centralized control side. The monitoring model is then synchronized across areas to the information management area on the centralized control side to generate visual intelligent reports, thus realizing centralized monitoring and analysis of equipment load on the centralized control station side.

Images