Regional power generation and consumption balance analysis and cross-regional support path verification methods and systems

Abstract

This invention provides a method and system for regional power generation and consumption balance analysis and cross-regional support path verification. The method includes: acquiring data from external files and database servers; dynamically identifying power grid zones; statistically analyzing power generation and load data within each zone, performing regional power generation and consumption balance prediction and monitoring, and issuing alarms based on power generation and load comparison results; performing zoned load transfer auxiliary decision-making for alarmed zones, forming load transfer schemes and corresponding cross-regional support paths, and performing basic state power flow verification, static security analysis, and risk warnings; exporting a controllable load list for power curtailment; and displaying the power generation and consumption balance analysis and cross-regional support path verification results on the front end. This invention enables dynamic monitoring of regional power generation and consumption, providing dispatchers with effective regional load transfer strategies and security verification results, ensuring the operational security of regional power supply networks, and providing strong support for the coordinated and optimized operation of provincial and local power grids.

Description

Technical Field

[0001] This invention relates to the field of regional power generation and consumption balance in power systems, and more specifically, to a method and system for regional power generation and consumption balance analysis and cross-regional support path verification. Background Technology

[0002] The construction of a new power system with new energy sources as its mainstay integrates various traditional and new centralized and distributed energy sources such as thermal, hydro, wind, solar, and energy storage. This results in a complex and ever-changing energy structure, posing significant challenges to power grid operation and regulation. On the one hand, building a new power system is a crucial measure to implement the "carbon peaking and carbon neutrality" strategy and construct a new energy system. In the process of building this new power system, systemic changes occur in all aspects of the power generation, grid, load, and storage systems, placing higher demands on the power system's regulation capabilities and necessitating further improvement in the intelligence level of grid dispatching.

[0003] On the other hand, the provincial urban power grid adopts a hierarchical and zoned control and management model, which de-loops into multiple power supply zones operating independently. The boundaries of the power grid zones change dynamically with the power grid operation mode. The static zone transfer channels customized according to the conventional operation mode cannot be matched with the current operation mode in real time, and it is impossible to formulate an effective load transfer plan. This will affect the safety, reliability and rationality of power grid operation.

[0004] Currently, load balancing calculations and load transfers are performed manually by power grid dispatchers. However, this load transfer causes a sharp increase in load, pushing the power supply limit to near its limit and posing certain safety hazards to the power grid. Taking a megacity power grid with a robust 500kV double-ring network and 220kV zoned operation as an example, the urban power grid is affected by imbalances in regional power load and grid architecture development. During peak electricity consumption periods, equipment maintenance, or grid failures due to severe weather, there is a risk of localized power supply shortages or power outages for users.

[0005] The shortcomings of existing technologies are that relying solely on power grid dispatchers to manually identify power grid zones, perform balance analysis, and formulate load transfer strategies using offline zone compilation tools not only lacks unified standards and cannot track the zone boundary status in real time, but also suffers from cumbersome operations, low efficiency, and difficulty in achieving coordinated optimization of provincial and local power grids in actual operation.

[0006] The shortcomings of the existing technology 1 (CN114614468B) are that the analysis target of the load transfer analysis method for the distribution network area is only the main transformer and substation of the distribution network that need to transfer load, and it is not applicable to the load transfer of the main grid, so the power business scenarios that can be met are relatively limited; and it does not perform safety verification on the execution process and final result of the load transfer scheme, and cannot provide alarm prompts for load transfer zone schemes that may cause ground state, N-1 transformer thermal stability over-limit and equipment power failure, which will bring unpredictable risks to the power grid. Summary of the Invention

[0007] To overcome the technical problems existing in the prior art, this invention provides a method and system for regional power generation and consumption balance analysis and cross-regional support path verification. By dynamically acquiring real-time power grid models and data information, it realizes the function of dynamic identification of power grid zones and zone boundaries; combined with day-ahead and intraday forecasts and planning information, it realizes the function of real-time monitoring of regional power generation and consumption balance with multi-energy structure and low-margin zone alarm prompts; it realizes intraday power generation and consumption balance risk prediction and generates auxiliary decision-making and safety verification methods for inter-regional energy transfer and load transfer.

[0008] This invention can meet the requirements of power balance monitoring and supply guarantee under diversified energy sources, improve resource coordination capabilities, and enhance the online monitoring, analysis, early warning, optimization decision-making, and verification and evaluation capabilities of integrated provincial and regional power generation and supply balance, providing strong support for the coordinated and optimized operation of provincial and regional power grids. It significantly improves the intelligence and automation level of the control system and reduces the workload of control personnel.

[0009] The present invention adopts the following technical solution.

[0010] The first aspect of the present invention provides a method for regional power generation and consumption balance analysis and cross-regional support path verification, comprising the following steps:

[0011] Step 1: Obtain underlying data, load forecast data, regional load shedding list data, interconnection transformer stability limit data, and margin alarm threshold values ​​for each zone from external files and database servers; among which, the underlying data includes: real-time power grid model, measurement, parameter and state estimation calculation results; the load forecast data includes: day-ahead load forecast and intraday load forecast data;

[0012] Step 2: Dynamically identify power grid zones based on the real-time power grid model and parameters. The identification content includes equipment within the zone, the boundary point of the power grid zone, and the hot standby capacity of generators / transformers.

[0013] Step 3: Based on the real-time power grid measurement and state estimation calculation results, day-ahead load forecast and intraday load forecast data, and interconnection transformer stability limit data, statistically analyze the power generation and load data within the zone, perform zone power generation and consumption balance forecast and monitoring, and issue alarms based on the power generation and load comparison results and the margin alarm threshold values ​​of each zone.

[0014] Step 4: Perform load transfer auxiliary decision-making for the partitions alarmed in Step 3, form a load transfer partition scheme and corresponding cross-regional support path, and perform basic state power flow verification, static security analysis and risk warning. If the power generation and consumption of the partitions are still not balanced after cross-regional support, export the controllable load list from the regional power rationing load list and execute power rationing.

[0015] Step 5: Display the results of power generation and consumption balance analysis and cross-regional support path verification on the front end.

[0016] Preferably, dynamic identification of power grid zones specifically includes:

[0017] Identify the equipment within the zone and determine the zone number based on its connection status with the main transformer. On the basis of the distribution network, the main transformers of the main grid substation are equivalent to generator sets. The topology analysis function of the state estimation program is used to perform electrical island analysis. All distribution network voltage level equipment within the zone shares the same zone number with the main transformer within the zone. Distribution network voltage level equipment not connected to the main transformer shares the dead island zone number.

[0018] Identify the boundary points of the power grid zones, including two types: disconnected bus tie / bus branch switches and disconnected lines;

[0019] Identify hot standby capacity, traverse all generators and generator-transformer units belonging to the dead island zone, analyze their operating status, and if the unit / generator-transformer unit is in hot standby status, include the capacity of the unit / generator-transformer unit in the hot standby capacity of the zone to which its hot standby bus belongs.

[0020] Preferably, when identifying the boundary point of the power grid zone, if the boundary point type of the identified power grid zone is an open bus tie / bus branch switch, all open bus tie / bus branch switches are traversed. If the two busbars belong to different zones, including dead island zones, then the switch is defined as the zone boundary point and the zone numbers on both sides of the boundary point are recorded.

[0021] When the boundary point type of the identified power grid section is an open line, all open lines are traversed to identify the section to which the busbars at both ends of the line belong. If the busbars at both ends belong to different sections, including dead island sections, then the line is defined as the section boundary point and the section numbers on both sides of the boundary point are recorded.

[0022] Preferably, monitoring the power balance of the zone and issuing alarms specifically includes:

[0023] The statistics include the power generation within the zone, including real-time power generation, power generation capacity, and power generation capacity including thermal reserve.

[0024] Statistical load within the partition, including real-time and forecast values;

[0025] The system displays the real-time value of power generation, power generation capacity, power generation capacity including thermal reserve, real-time value of active power, and predicted value of active power in the region in the form of curves. It automatically compares the predicted value of active power and the power generation capacity, calculates the power balance margin of the region based on the difference between the power generation capacity and the predicted value of active power, and issues an alarm for the region whose power balance margin is lower than the alarm threshold.

[0026] Preferably, when calculating the power generation within a zone, the hot reserve active capacity of the peak-shaving natural gas units is summed up as the hot reserve portion of the power generation capacity of the zone including hot reserve, and the hot reserve is increased or the active capacity of coal-fired units is suspended in the short term as the hot reserve portion.

[0027] When calculating the load within a zone, the sum of the active loads of all buses in the zone at each time point in the past 24 hours is calculated to generate the zone load active power curve. The maximum value of the zone load active power curve is taken as the predicted peak load of the bus in that zone.

[0028] Preferably, the zoned load transfer auxiliary decision-making, safety verification, and power rationing specifically include:

[0029] The first load transfer zone auxiliary decision is made by traversing the boundary points of the zones with power generation and consumption balance warning, including bus tie / branch switches and boundary lines. The predicted peak load of the bus inside the boundary point and the power generation and consumption balance margin of the zone outside the boundary point are calculated. If the predicted peak load of the bus is less than the balance margin, a load transfer zone scheme is formed.

[0030] A second load shift zone auxiliary decision is made, and the power generation and consumption balance of all zones after the first load shift zone scheme is implemented is monitored. Load shift zone auxiliary decision is then executed again for the balance warning zones.

[0031] Monitor the power generation and consumption balance after the implementation of the second load transfer zone scheme, generate a list of controllable loads within the zone for the balance warning zone, export it to the external batch load control module, and generate zone power rationing statistics;

[0032] For the execution process and final results of all load transfer zoning schemes, perform ground-state power flow verification and static safety analysis, and issue alarms for load transfer zoning schemes that may cause ground-state and N-1 transformer thermal stability over-limits and equipment power failure.

[0033] Preferably, the load transfer zone scheme includes the name of the boundary point equipment, the name of the zone, the balance margin of the zone, the name of the bus in this zone, and the amount of load transferred; all load transfer zone schemes are displayed in a list format, arranged in reverse order of the transfer load capacity.

[0034] Preferably, the load transfer to zone operation is performed according to the type of boundary point. If the boundary point is a bus tie switch, the bus switching operation is performed; if the boundary point is a bus branch switch, the bus branch operation is performed; if the boundary point is a line, the line operation is performed.

[0035] Preferably, in step 5, the main functional results of the system are displayed using a front-end and back-end separated web technology, including: partition information, partition boundary information, partition margin information, internal power supply of the partition, backup power supply information, load transfer strategy and verification result information between partitions, regional power rationing list information, and global control parameter information.

[0036] A second aspect of the present invention provides a regional power generation and consumption balance analysis and cross-regional support path verification system, wherein the method for performing the regional power generation and consumption balance analysis and cross-regional support path verification includes:

[0037] The data parsing module is used to retrieve data from external files and database servers;

[0038] The dynamic identification module for power grid zones is used to dynamically identify equipment within a zone, the boundary point of the power grid zone, and the hot standby capacity of generators / transformers.

[0039] The zoned power generation and consumption balance monitoring module is used to statistically analyze power generation and load data within a zone, perform zoned power generation and consumption balance prediction and monitoring, and issue alarms based on the comparison results of power generation and load.

[0040] The partition load transfer auxiliary decision module is used to make auxiliary decisions on partition load transfer for alarmed partitions, export a list of controllable loads, and perform security verification on the resulting load transfer partition scheme and the corresponding cross-region support path.

[0041] The zoning information and load transfer strategy display module is used to display the results of power generation and consumption balance analysis and cross-regional support path verification in the front end.

[0042] The analysis results read / write module is used for data exchange between external files, database servers, and function execution modules.

[0043] Compared with the prior art, the beneficial effects of the present invention include at least the following:

[0044] This invention, based on the monitoring of regional power generation and consumption balance and load forecasting, enables dynamic adjustment of regional boundaries according to the power grid operation mode, dynamically monitors regional power generation and consumption, provides dispatchers with effective regional load transfer strategies and safety verification results, improves the operational stability and reliability of the power grid, ensures the operational safety of regional power supply networks, and enhances the online monitoring, analysis, early warning, optimization decision-making, and verification evaluation capabilities of integrated provincial and regional regional power generation and consumption balance. It provides strong support for the coordinated and optimized operation of provincial and regional power grids, specifically including:

[0045] (1) To address the differences in the positioning and solutions for zoning issues caused by the differences in the professional skills of power grid dispatchers, a unified adjustment standard is adopted to standardize the operation content, reduce the daily complicated and difficult business problems of dispatchers, and improve the professional skills of personnel.

[0046] (2) Online real-time monitoring and decision-making software replaces offline partitioning tools and human experience-based decision-making methods, reducing the processing time from 30 minutes to 10 minutes in offline mode, greatly improving the efficiency of operation mode adjustment, ensuring the safe and stable operation of the power grid, reducing the risk of equipment damage, and saving economic costs.

[0047] (3) Further and more effectively ensure the stability of the power grid operation, maintain the safety of urban power supply and the guarantee of electricity use, and safeguard people's livelihood.

[0048] (4) Provides a user-friendly human-computer interaction interface, adopting a clear functional module and an intuitive and simple nine-grid interface display style. When switching partitions, all monitoring statistics and verification analysis results can be cascaded and refreshed, and a single-point self-query function is provided. At the same time, manual triggering of security verification calculation is supported. Attached Figure Description

[0049] Figure 1 This is a functional structure diagram of the power grid regional power generation and consumption balance and inter-regional path verification system;

[0050] Figure 2 This is a flowchart of the dynamic identification of power grid zones function;

[0051] Figure 3 This is a flowchart of the power generation and consumption balance monitoring and alarm function for different zones;

[0052] Figure 4 This is a flowchart of the zoned load transfer auxiliary decision-making and verification function;

[0053] Figure 5 This is a flowchart of a method for regional power generation and consumption balance analysis and cross-regional support path verification provided by an embodiment of the present invention. Detailed Implementation

[0054] To make the objectives, technical solutions, and advantages of this invention clearer, the technical solutions of this invention will be clearly and completely described below with reference to the accompanying drawings of the embodiments of this invention. The embodiments described in this application are merely some embodiments of this invention, and not all embodiments. Based on the spirit of this invention, other embodiments obtained by those skilled in the art without creative effort are all within the protection scope of this invention.

[0055] Given that the existing system architecture and regional power generation and consumption balance analysis methods are not comprehensive, relying heavily on human experience for regional power generation load balance calculations and load transfer analysis decisions, supply and demand imbalances still exist in some hot spots during peak electricity consumption periods. At the same time, cross-regional load transfer schemes that rely on human experience and offline compilation of transfer channels pose certain safety risks to the power grid.

[0056] Meanwhile, to ensure a highly reliable power supply for megacities and to build a resilient power grid that is "unbreakable by the main grid and uninterrupted by the distribution network," this invention integrates 220kV regional power generation and consumption balance analysis of the provincial power grid and load transfer analysis of the main and distribution networks. Therefore, this invention provides a power grid regional power generation and consumption balance and cross-regional support path verification system for provincial dispatching and main and distribution networks. This system enables comprehensive regional power generation and consumption balance monitoring and cross-regional path support, improves the calculation standardization and accuracy of load transfer auxiliary decision-making and safety verification, and effectively ensures the reliability of power supply in local areas of the power grid and the safety of electricity use for people's livelihood.

[0057] like Figure 5 As shown, Embodiment 1 of the present invention provides a method for regional power generation and consumption balance analysis and cross-regional support path verification, taking a mega-city power grid with a robust 500kV double-ring network and 220kV regional operation as an example for illustration, but this should not be used to limit the scope of protection of the present invention. The method includes the following steps:

[0058] Step 1: Obtain underlying data from external files by parsing standard E-format files, including real-time power grid models, measurements, parameters, and state estimation calculation results; obtain load forecast data from the database server by reading relational databases, including day-ahead load forecasts and intraday load forecasts, obtain regional load shedding list data and 500kV interconnection transformer stability limit data, and obtain basic low margin alarm threshold values ​​for each zone.

[0059] Step 2: Dynamically identify power grid zones based on the real-time power grid model and parameters. The identification includes equipment within each zone, the zone boundary points, and the hot standby capacity of 220kV generators / transformers. Figure 2 As shown.

[0060] In a preferred but non-limiting embodiment of the present invention, step 2 specifically includes:

[0061] Step 2.1: Based on the 220kV power grid, the main transformer of the 500kV substation is equated to a generator unit. Electrical island analysis is performed using the topology analysis function of the state estimation program. The zone number is determined based on the connection status with the main transformer. All 220kV equipment within a zone shares the same island number (zone number) as the 500kV main transformer within that zone. 220kV equipment not connected to the 500kV main transformer shares the dead island zone number.

[0062] Step 2.2: Identify the grid zone boundary points, including two types: disconnected bus tie / bus branch switches and disconnected lines.

[0063] When the identified grid division boundary point type is an open bus tie / bus branch switch, all open 220kV bus tie / bus branch switches are traversed. If the two busbars belong to different 220kV divisions, including dead island divisions, then the switch is defined as the division boundary point and the division numbers on both sides of the boundary point are recorded.

[0064] When the identified grid division boundary type is an interrupted line, all interrupted 220kV lines (with apparent power at the AC line end below the threshold value) are traversed to identify the division to which the busbars at both ends of the line belong. If the busbars at both ends belong to different 220kV divisions, including dead island divisions, then the line is defined as the division boundary point and the division numbers on both sides of the boundary point are recorded.

[0065] Step 2.3: Identify the 220kV hot standby capacity. Specifically, iterate through all generators and generator-transformer units that are not directly connected to the 500kV power supply point, i.e., belong to the dead island zone, and analyze their operating status. If the unit / generator-transformer unit is in hot standby status, include the capacity of the unit / generator-transformer unit in the hot standby capacity of the zone to which its hot standby bus belongs.

[0066] Understandably, through Figure 2 The system's dynamic identification of power grid zones employs local topology fast search and positioning technology to identify information inside and outside the power grid zones. It uses two styles, dynamic scatter plot and holographic power flow plot, to track and display the boundary connections of the zones and the changes in the internal and external power plants and boundaries in real time.

[0067] Step 3: Based on real-time grid measurements and state estimation calculations, day-ahead and intraday load forecasts, and interconnection transformer stability limit data, statistically analyze the generation and load data within each zone, perform zoned power balance forecasting and monitoring, and issue alarms to zones with low margins based on the generation-load comparison results and the margin alarm threshold values ​​for each zone. Figure 3 As shown.

[0068] In a preferred but non-limiting embodiment of the present invention, step 3 specifically includes:

[0069] Step 3.1: Calculate the power generation within the zone, including real-time power generation value, power generation capacity, and power generation capacity including hot reserve. Specifically, sum the real-time active power output of the generator units within the zone and the real-time active power flow of the 500kV main transformer to calculate the real-time power generation value of the zone; sum the active power capacity of the generator units within the zone and the active power capacity of the 500kV main transformer to calculate the power generation capacity of the zone, representing the real-time power supply capacity; sum the power generation capacity of the zone and all hot reserve active power capacity of the zone to calculate the power generation capacity of the zone including hot reserve, representing the available power supply capacity.

[0070] More preferably, the hot reserve active capacity of the peak-shaving natural gas units is summed up as the hot reserve portion of the power generation capacity of the zone including hot reserve, and the hot reserve or the active capacity of the coal-fired units is increased in the short term to supplement the short-term available power supply capacity of the zone.

[0071] Step 3.2: Calculate the load within the zone, including real-time and predicted values. Specifically, sum the real-time active power values ​​of the 220kV load, 220kV main transformer winding, and 220kV boundary line within the zone to calculate the real-time load value of the zone. Read the day-ahead load forecast and intraday load forecast data obtained in Step 1 to calculate the predicted value and peak value of the zone's active power curve for the next 24 hours.

[0072] More preferably, the sum of the active loads of all buses in the zone at each time point in the past 24 hours is calculated to generate the active load curve of the zone, and its maximum value is the predicted peak load of the bus in that zone.

[0073] Step 3.3 displays the real-time generation value, generation capacity, generation capacity including thermal reserve, real-time active power value of load, and predicted active power value of load in the form of curves from Steps 3.1 and 3.2; automatically compares the predicted active power value of load with the generation capacity, calculates the power balance margin of the region based on the difference between the generation capacity and the predicted active power value of load, and issues an alarm for the region whose power balance margin of power generation and consumption is lower than the alarm threshold value.

[0074] More preferably, a level two alarm is issued when the predicted active power load exceeds the generating capacity, and a level one alarm is issued when the predicted active power load exceeds the generating capacity including thermal reserve.

[0075] Understandably, through Figure 3 It has functions for power generation statistics, load statistics and power balance monitoring within the zone. It can monitor and statistically analyze various types of power supply values ​​(real-time power supply value, real-time power supply capacity, short-term available power supply capacity and available power supply capacity) and load values ​​(real-time load value, 4-hour and 24-hour load forecast) within the zone. It provides dynamic change curves and margin lists for balance monitoring and promptly alerts dispatchers when the power balance margin is negative for the zone.

[0076] Step 4: Perform load transfer auxiliary decision-making for the zones alarmed in Step 3, forming a load transfer zone scheme and corresponding cross-zone support path. Then, perform basic state power flow verification, static security analysis, and risk warnings. If the power generation and consumption of the zone are still unbalanced after cross-zone support, export the controllable load list from the regional load shedding list and execute load shedding. Figure 4 As shown.

[0077] In a preferred but non-limiting embodiment of the present invention, step 4 specifically includes:

[0078] Step 4.1 involves the first load transfer zone auxiliary decision-making process. Specifically, the zone boundaries for the power generation and consumption balance early warning are traversed, including bus tie / branch switches and boundary lines. The predicted peak load of the bus inside the boundary point and the power generation and consumption balance margin of the zone outside the boundary point are calculated. If the predicted peak load of the bus is less than the balance margin, a load transfer zone scheme is formed, including the boundary point equipment name, the zone name, the zone balance margin, the name of the bus in this zone, and the amount of load to be transferred.

[0079] More preferably, all load transfer zone schemes are displayed in list form, arranged in descending order of load transfer capacity.

[0080] More preferably, the load transfer zone operation is classified according to the boundary point type as follows:

[0081] If the dividing point is the bus tie switch, the load transfer to zone operation is classified as "busbar switching operation";

[0082] If the dividing point is a bus-to-branch switch, the load transfer to zone operation is classified as "bus-to-branch operation";

[0083] If the dividing point is a line, the load transfer to a zone operation is classified as "line operation".

[0084] Step 4.2: Perform the second load transfer zone auxiliary decision. Specifically, monitor the power generation and consumption balance of all zones after the first load transfer zone scheme has been implemented, and return to step 4.1 to perform the load transfer zone auxiliary decision again for the balance warning zone.

[0085] Step 4.3: Monitor the power generation and consumption balance of all areas after the implementation of the second load transfer zone scheme, generate a list of controllable loads within the zone for the balance warning zone, export it to the external batch load control module, and generate zone power rationing statistics.

[0086] Step 4.4: Perform ground-state power flow verification and static security analysis on the execution process and final results of all load transfer schemes, verify whether the grid components are overloaded and whether the grid voltage level meets the requirements during the load transfer operation, and issue alarm prompts for load transfer schemes that may cause ground-state and N-1 transformer thermal stability over-limits and equipment power failure.

[0087] Understandably, through Figure 4 The load transfer strategy and safety verification function provide multiple load transfer channels (bus / bus branch switch and AC line segment) for zones with balance risks, and external triggers complete the safety verification calculation under a single load transfer strategy or multiple strategies; through Figure 4 The system has a zoned load shedding and rationing statistics function, which provides two types of load lists: over-supply capacity and under-supply capacity. The load categories of each region are associated with different zones, making it easy for dispatchers to intuitively grasp the load shedding and rationing information of each region's directly subordinate zones.

[0088] Step 5: Display the results of power generation and consumption balance analysis and cross-regional support path verification on the front end.

[0089] Preferably, the system utilizes front-end and back-end separation web technology to display the main functional results, including: partition information, partition boundary information, partition margin information, internal power supply and backup power supply information of the partition, as well as load transfer strategies and verification results between partitions, regional power rationing list information, and global control parameter information such as calculation time and calculation status; it adopts a clear functional module and intuitive nine-grid interface display style; it provides single-point self-query function, and also supports manual triggering of safety verification calculation.

[0090] It is worth noting that this embodiment uses a 500kV / 220kV main distribution network as an example for illustration, but the regional power generation and consumption balance analysis and cross-regional support path verification method of the present invention are also applicable to main distribution networks of other voltage levels. Based on the spirit of the present invention, they all fall within the protection scope of the present invention.

[0091] It is understandable that the significant difference between the load transfer analysis method for distribution network areas provided by prior art 1 (CN114614468B) and the present invention lies in that the load transfer analysis for distribution networks only provides one load transfer line as the optimal load transfer line for the corresponding distribution network line. The present invention, however, can not only dynamically identify the main and distribution networks, but also intuitively display the real-time values ​​of generation, generation capacity, generation capacity including thermal reserve, real-time values ​​of active power, and predicted values ​​of active power in each zone. This enables zoned power generation and consumption balance monitoring and early warning, and provides multiple load transfer decision and verification results for zones with balance risks. These results allow dispatching and operation personnel to optimize solutions based on the actual operating status of the power grid and mitigate power grid operation risks caused by load transfer.

[0092] like Figure 1 As shown, Embodiment 2 of the present invention provides a regional power generation and consumption balance analysis and cross-regional support path verification system, which includes the following steps for running the regional power generation and consumption balance analysis and cross-regional support path verification method:

[0093] The data parsing module is used to retrieve data from external files and database servers;

[0094] The dynamic identification module for power grid zones is used to dynamically identify equipment within a zone, the boundary point of the power grid zone, and the hot standby capacity of generators / transformers.

[0095] The zoned power generation and consumption balance monitoring module is used to statistically analyze power generation and load data within a zone, perform zoned power generation and consumption balance prediction and monitoring, and issue alarms based on the comparison results of power generation and load.

[0096] The partition load transfer auxiliary decision module is used to make auxiliary decisions on partition load transfer for alarmed partitions, export a list of controllable loads, and perform security verification on the resulting load transfer partition scheme and the corresponding cross-region support path.

[0097] The zoning information and load transfer strategy display module is used to display the results of power generation and consumption balance analysis and cross-regional support path verification in the front end.

[0098] The analysis results read / write module is used for data exchange between external files, database servers, and function execution modules.

[0099] Compared with the prior art, the beneficial effects of the present invention include at least the following:

[0100] This invention, based on the monitoring of regional power generation and consumption balance and load forecasting, enables dynamic adjustment of regional boundaries according to the power grid operation mode, dynamically monitors regional power generation and consumption, provides dispatchers with effective regional load transfer strategies and safety verification results, improves the operational stability and reliability of the power grid, ensures the operational safety of regional power supply networks, and enhances the online monitoring, analysis, early warning, optimization decision-making, and verification evaluation capabilities of integrated provincial and regional regional power generation and consumption balance. It provides strong support for the coordinated and optimized operation of provincial and regional power grids, specifically including:

[0101] (1) To address the differences in the positioning and solutions for zoning issues caused by the differences in the professional skills of power grid dispatchers, a unified adjustment standard is adopted to standardize the operation content, reduce the daily complicated and difficult business problems of dispatchers, and improve the professional skills of personnel.

[0102] (2) Online real-time monitoring and decision-making software replaces offline partitioning tools and human experience-based decision-making methods, reducing the processing time from 30 minutes to 10 minutes in offline mode, greatly improving the efficiency of operation mode adjustment, ensuring the safe and stable operation of the power grid, reducing the risk of equipment damage, and saving economic costs.

[0103] (3) Further and more effectively ensure the stability of the power grid operation, maintain the safety of urban power supply and the guarantee of electricity use, and safeguard people's livelihood.

[0104] (4) Provides a user-friendly human-computer interaction interface, adopting a clear functional module and an intuitive and simple nine-grid interface display style. When switching partitions, all monitoring statistics and verification analysis results can be cascaded and refreshed, and a single-point self-query function is provided. At the same time, manual triggering of security verification calculation is supported.

[0105] This disclosure can be a system, method, and / or computer program product. A computer program product may include a computer-readable storage medium having computer-readable program instructions loaded thereon for causing a processor to implement various aspects of this disclosure.

[0106] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention and not to limit it. Although the present invention has been described in detail with reference to the above embodiments, those skilled in the art should understand that modifications or equivalent substitutions can still be made to the specific implementation of the present invention. Any modifications or equivalent substitutions that do not depart from the spirit and scope of the present invention should be covered within the protection scope of the claims of the present invention.

Claims

1. A method for regional power generation and consumption balance analysis and cross-regional support path verification, characterized in that, Includes the following steps: Step 1: Obtain underlying data, load forecast data, regional load shedding list data, interconnection transformer stability limit data, and margin alarm threshold values ​​for each zone from external files and database servers; among which, the underlying data includes: real-time power grid model, measurement, parameter and state estimation calculation results; the load forecast data includes: day-ahead load forecast and intraday load forecast data; Step 2: Dynamically identify power grid zones based on the real-time power grid model and parameters. The identification includes equipment within the zone, the boundary point of the power grid zone, and the hot standby capacity of generators / transformers. Step 3: Based on the real-time power grid measurement and state estimation calculation results, day-ahead load forecast and intraday load forecast data, and interconnection transformer stability limit data, statistically analyze the power generation and load data within the zone, perform zone power generation and consumption balance forecast and monitoring, and issue alarms based on the power generation and load comparison results and the margin alarm threshold values ​​of each zone. Step 4: Perform load transfer auxiliary decision-making for the partitions alarmed in Step 3, form a load transfer partition scheme and corresponding cross-regional support path, and perform safety verification. If the power generation and consumption of the partitions are still not balanced after cross-regional support, export the controllable load list from the regional load restriction list and execute the load restriction. Among them, zoned load transfer auxiliary decision-making, safety verification and power rationing include: The first load transfer zone auxiliary decision is made by traversing the boundary points of the zones with power generation and consumption balance warning, including bus tie / branch switches and boundary lines. The predicted peak load of the bus inside the boundary point and the power generation and consumption balance margin of the zone outside the boundary point are calculated. If the predicted peak load of the bus is less than the balance margin, a load transfer zone scheme is formed. A second load shift zone auxiliary decision is made, and the power generation and consumption balance of all zones after the first load shift zone scheme is implemented is monitored. Load shift zone auxiliary decision is then executed again for the balance warning zones. Monitor the power generation and consumption balance after the implementation of the second load transfer zone scheme, generate a list of controllable loads within the zone for the balance warning zone, export it to the external batch load control module, and generate zone power rationing statistics; For the execution process and final results of all load transfer zoning schemes, perform ground-state power flow verification and static security analysis, and provide alarm prompts for load transfer zoning schemes that may cause ground-state and N-1 transformer thermal stability over-limits and equipment power failure; Step 5: Display the results of power generation and consumption balance analysis and cross-regional support path verification on the front end.

2. The method for regional power generation and consumption balance analysis and cross-regional support path verification as described in claim 1, characterized in that: Dynamic identification of power grid zones specifically includes: Identify the equipment within the zone and determine the zone number based on its connection status with the main transformer. On the basis of the distribution network, the main transformers of the main grid substation are equivalent to generator sets. The topology analysis function of the state estimation program is used to perform electrical island analysis. All distribution network voltage level equipment within the zone shares the same zone number with the main transformer within the zone. Distribution network voltage level equipment not connected to the main transformer shares the dead island zone number. Identify the boundary points of the power grid zones, including two types: disconnected bus tie / bus branch switches and disconnected lines; Identify hot standby capacity, traverse all generators and generator-transformer units belonging to the dead island zone, analyze their operating status, and if the unit / generator-transformer unit is in hot standby status, include the capacity of the unit / generator-transformer unit in the hot standby capacity of the zone to which its hot standby bus belongs.

3. The method for regional power generation and consumption balance analysis and cross-regional support path verification as described in claim 2, characterized in that: When identifying the boundary point of the power grid zone, if the boundary point type of the identified power grid zone is an open bus tie / bus branch switch, all open bus tie / bus branch switches are traversed. If the two busbars belong to different zones, including dead island zones, then the switch is defined as the zone boundary point and the zone numbers on both sides of the boundary point are recorded. When the boundary point type of the identified power grid section is an open line, all open lines are traversed to identify the section to which the busbars at both ends of the line belong. If the busbars at both ends belong to different sections, including dead island sections, then the line is defined as the section boundary point and the section numbers on both sides of the boundary point are recorded.

4. The method for regional power generation and consumption balance analysis and cross-regional support path verification as described in claim 1, characterized in that: Monitoring the power balance of the zone and issuing alarms specifically includes: The statistics include the power generation within the zone, including real-time power generation, power generation capacity, and power generation capacity including thermal reserve. Statistical load within the partition, including real-time and forecast values; The system displays the real-time value of power generation, power generation capacity, power generation capacity including thermal reserve, real-time value of active power, and predicted value of active power in the region in the form of curves. It automatically compares the predicted value of active power and the power generation capacity, calculates the power balance margin of the region based on the difference between the power generation capacity and the predicted value of active power, and issues an alarm for the region whose power balance margin is lower than the alarm threshold.

5. The method for regional power generation and consumption balance analysis and cross-regional support path verification as described in claim 4, characterized in that: When calculating the power generation within a zone, the active capacity of the hot reserve of the peak-shaving natural gas units is summed up as the hot reserve portion of the power generation capacity of the zone, and the active capacity of the hot reserve or coal-fired units is increased or suspended in the short term as the hot reserve portion. When calculating the load within a zone, the sum of the active loads of all buses in the zone at each time point in the past 24 hours is calculated to generate the zone load active power curve. The maximum value of the zone load active power curve is taken as the predicted peak load of the bus in that zone.

6. The method for regional power generation and consumption balance analysis and cross-regional support path verification as described in claim 1, characterized in that: The load transfer zone scheme includes the name of the boundary point equipment, the name of the zone, the balance margin of the zone, the name of the bus in this zone, and the amount of load transferred; all load transfer zone schemes are displayed in a list format, arranged in descending order of the transfer load capacity.

7. The method for regional power generation and consumption balance analysis and cross-regional support path verification as described in claim 1, characterized in that: The load transfer operation is performed according to the type of the boundary point. If the boundary point is a bus tie switch, the bus transfer operation is performed; if the boundary point is a bus branch switch, the bus branch operation is performed; if the boundary point is a line, the line operation is performed.

8. The method for regional power generation and consumption balance analysis and cross-regional support path verification as described in claim 1, characterized in that: In step 5, the main functional results of the system are displayed using front-end and back-end separation web technology, including: partition information, partition boundary information, partition margin information, internal power supply of the partition, backup power supply information, load transfer strategy and verification results between partitions, regional power rationing list information, and global control parameter information.

9. A system for regional power generation and consumption balance analysis and cross-regional support path verification, comprising the method for regional power generation and consumption balance analysis and cross-regional support path verification as described in any one of claims 1-8, characterized in that, include: The data parsing module is used to retrieve data from external files and database servers; The dynamic identification module for power grid zones is used to dynamically identify equipment within a zone, the boundary point of the power grid zone, and the hot standby capacity of generators / transformers. The zoned power generation and consumption balance monitoring module is used to statistically analyze power generation and load data within a zone, perform zoned power generation and consumption balance prediction and monitoring, and issue alarms based on the comparison results of power generation and load. The partition load transfer auxiliary decision module is used to make auxiliary decisions on partition load transfer for alarmed partitions, export a list of controllable loads, and perform security verification on the resulting load transfer partition scheme and the corresponding cross-region support path. The zoning information and load transfer strategy display module is used to display the results of power generation and consumption balance analysis and cross-regional support path verification in the front end. The analysis results read / write module is used for data exchange between external files, database servers, and function execution modules.

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