Absorption early warning method and device for evaluating new energy absorption condition

Abstract

The invention relates to a consumption early warning method and device for evaluating a new energy consumption condition, and belongs to the field of new energy. First power generation output generated by a rehearsal new energy station according to a current day power generation plan is analyzed; in the analysis rehearsal process, the current intra-day power generation plan is optimized according to an out-of-limit result of the new energy station, and a current intra-day optimized power generation plan is generated; if second power generation output generated by the new energy station according to the current intra-day optimization power generation plan is reduced compared with the first power generation output, determining a blocking reason and blocking details of the new energy station, and generating current consumption early warning information containing the blocking reason and the blocking details; according to the current consumption early warning information and the historical consumption early warning information, the new energy consumption condition is evaluated, the future possible blocking condition of the new energy station is early warned through real-time consumption, the new energy consumption condition is evaluated, the new energy station consumption condition is known, and power grid planning and new energy construction planning are effectively guided.

Description

Technical Field

[0001] This invention relates to a method and equipment for assessing the consumption of new energy sources and providing early warning, belonging to the field of new energy. Background Technology

[0002] New energy power generation refers to the process of converting renewable energy sources such as solar, wind, and hydropower into electrical energy through technological means. According to the power balance cycle, new energy power generation plans can be divided into four categories: annual, monthly, day-ahead, and real-time power generation plans. Among them, the real-time power generation plan should be based on the day-ahead power generation plan, and take into account the ultra-short-term new energy power forecast and grid operation to assess the new energy acceptance capacity, so as to adjust the power generation plan in a timely manner or take emergency control measures.

[0003] In existing technologies, when formulating day-ahead and real-time generation plans, if the grid's power balance prevents the full integration of new energy sources, a system should be established to request adjustments to the tie-line power generation plan from the next higher level of control agency. The higher-level control agency should respond to the adjustment request from the lower-level control agency within a specified timeframe. If peak-shaving prevents the full integration of new energy sources, the grid's spinning reserve capacity should meet the requirements of the "Technical Guidelines for Power Systems" (SD131-84). If insufficient grid transmission capacity prevents the full integration of new energy sources, the utilization rate of outgoing transmission lines (sections) should be no less than 90%.

[0004] When operating according to a real-time power generation plan, the capacity or volume of renewable energy generation can be safely and stably accommodated. However, when operating according to a day-ahead power generation plan, renewable energy generation should be controlled and the day-ahead power generation plan adjusted to maximize the absorption of renewable energy. How to understand the obstruction status of renewable energy power plants in real time and assess the overall absorption capacity of the plants based on the obstruction status is a pressing issue that needs to be addressed. Summary of the Invention

[0005] The purpose of this invention is to provide a method and device for assessing the consumption status of new energy sources, thereby generating consumption warning information when new energy power plants experience obstruction, and achieving the goal of assessing the consumption status of new energy power plants based on the consumption warning information.

[0006] To achieve the above objectives, on the one hand, the present invention provides a method for early warning of renewable energy consumption, comprising:

[0007] The analysis and simulation of the first power generation output of the new energy power station according to the current daily power generation plan are carried out. During the analysis and simulation, the current daily power generation plan is optimized based on the over-limit results of the new energy power station, and the current daily optimized power generation plan is generated.

[0008] If the second power output generated by the new energy power station according to the current daily optimized power generation plan is less than the first power output, then the cause and details of the obstruction of the new energy power station are determined, and a current consumption warning information containing the cause and details of the obstruction is generated.

[0009] Assess the renewable energy consumption situation based on current and historical consumption warning information.

[0010] Furthermore, the exceeded result is obtained through the following method:

[0011] In the process of analyzing the current intraday power generation plan, power flow calculation is performed based on the current intraday power generation plan to obtain the power flow calculation results;

[0012] Based on the power flow calculation results, it is determined whether the cross section of the new energy power station has exceeded the limit or is overloaded, whether the main transformer has exceeded the limit or is overloaded, and whether the line has exceeded the limit or is overloaded. The result of exceeding the limit is generated, which includes the judgment results of the cross section, the judgment results of the line, and the judgment results of the main transformer.

[0013] Furthermore, the reasons for the obstruction of new energy power stations were determined using the following methods:

[0014] In the current intraday optimized power generation plan, determine the target power generation time for which the second power generation output is reduced compared to the first power generation output;

[0015] By reviewing the current intraday power generation plan optimization process, we can determine the target limit exceedance results corresponding to the target power generation time.

[0016] Identify the obstructed equipment that caused the overload / overload in the target over-limit results; determine the obstructed equipment and its judgment result as the cause of the obstruction;

[0017] The reasons for the obstruction include one or more of the following: cross-section exceeding the limit, main transformer reverse overload, and line reverse overload.

[0018] Furthermore, the obstruction details include power flow information and load rate information of the obstructed device before and after optimization; wherein,

[0019] During the analysis based on the current intraday power generation plan, the power flow information and load rate information of the obstructed equipment before optimization are calculated;

[0020] During the analysis of the current intraday optimized power generation plan, the power flow information and load factor information of the obstructed equipment are calculated.

[0021] Furthermore, the current intraday power generation plan will be optimized through the following steps:

[0022] 1) Based on the target limit exceedance results and the target day's power generation plan, invoke the preset scheduling strategy to generate an optimized target day's power generation plan;

[0023] 2) Perform power flow calculation based on the optimized target intraday power generation plan to obtain the target power flow calculation results; based on the target power flow calculation results, determine whether the interruption section of the new energy power station has exceeded the limit or is overloaded, determine whether the main transformer has exceeded the limit or is overloaded, and determine whether the line has exceeded the limit or is overloaded.

[0024] 3) If any judgment result in 2) results in an overload or over-limit, then generate the latest target overload result based on the judgment result in 2); and determine the optimized target intraday power generation plan as the latest target intraday power generation plan; continue to execute 1) and 2) based on the latest target overload result and the latest target intraday power generation plan until all judgment results in 2) result in no overload or over-limit, and determine the optimized target intraday power generation plan in 2) as the intraday optimized power generation plan.

[0025] On the other hand, the present invention also proposes a consumption early warning device for assessing the consumption of new energy sources, including a processor, the processor being used to perform the following method steps: analyzing and rehearsing the first power generation output generated by the new energy power station according to the current daily power generation plan; during the analysis and rehearsal process, optimizing the current daily power generation plan based on the over-limit results of the new energy power station, and generating the current daily optimized power generation plan;

[0026] If the second power output generated by the new energy power station according to the current daily optimized power generation plan is less than the first power output, then the cause and details of the obstruction of the new energy power station are determined, and a current consumption warning information containing the cause and details of the obstruction is generated.

[0027] Assess the renewable energy consumption situation based on current and historical consumption warning information.

[0028] Furthermore, the exceeded result is obtained through the following method:

[0029] In the process of analyzing the current intraday power generation plan, power flow calculation is performed based on the current intraday power generation plan to obtain the power flow calculation results;

[0030] Based on the power flow calculation results, it is determined whether the cross section of the new energy power station has exceeded the limit or is overloaded, whether the main transformer has exceeded the limit or is overloaded, and whether the line has exceeded the limit or is overloaded. The result of exceeding the limit is generated, which includes the judgment results of the cross section, the judgment results of the line, and the judgment results of the main transformer.

[0031] Furthermore, the reasons for the obstruction of new energy power stations were determined using the following methods:

[0032] In the current intraday optimized power generation plan, determine the target power generation time for which the second power generation output is reduced compared to the first power generation output;

[0033] By reviewing the current intraday power generation plan optimization process, we can determine the target limit exceedance results corresponding to the target power generation time.

[0034] Identify the obstructed equipment that caused the overload / overload in the target over-limit results; determine the obstructed equipment and its judgment result as the cause of the obstruction;

[0035] The reasons for the obstruction include one or more of the following: cross-section exceeding the limit, main transformer reverse overload, and line reverse overload.

[0036] Furthermore, the obstruction details include power flow information and load rate information of the obstructed device before and after optimization; wherein,

[0037] During the analysis based on the current intraday power generation plan, the power flow information and load rate information of the obstructed equipment before optimization are calculated;

[0038] During the analysis of the current intraday optimized power generation plan, the power flow information and load rate information of the obstructed equipment are calculated.

[0039] Furthermore, the current intraday power generation plan will be optimized through the following steps:

[0040] 1) Based on the target limit exceedance results and the target day's power generation plan, invoke the preset scheduling strategy to generate an optimized target day's power generation plan;

[0041] 2) Perform power flow calculation based on the optimized target intraday power generation plan to obtain the target power flow calculation results; based on the target power flow calculation results, determine whether the interruption section of the new energy power station has exceeded the limit or is overloaded, determine whether the main transformer has exceeded the limit or is overloaded, and determine whether the line has exceeded the limit or is overloaded.

[0042] 3) If any judgment result in 2) results in an overload or over-limit, then generate the latest target overload result based on the judgment result in 2); and determine the optimized target intraday power generation plan as the latest target intraday power generation plan; continue to execute 1) and 2) based on the latest target overload result and the latest target intraday power generation plan until all judgment results in 2) result in no overload or over-limit, and determine the optimized target intraday power generation plan in 2) as the intraday optimized power generation plan.

[0043] The beneficial effects of this invention are as follows: It analyzes and simulates the first power output generated by a new energy power station according to the current daily power generation plan; during the analysis and simulation process, it optimizes the current daily power generation plan based on the over-limit results of the new energy power station, generating an optimized daily power generation plan; if the second power output generated by the new energy power station according to the optimized daily power generation plan is reduced compared to the first power output, it determines the obstruction cause and obstruction details of the new energy power station, generating current absorption warning information containing the obstruction cause and obstruction details; based on the current absorption warning information and historical absorption warning information, it assesses the new energy absorption situation, compares the current daily power generation plan with the optimized current daily power generation plan, and in response to the reduction in power output of the new energy power station, it obtains the possible future obstruction situations in the new energy power station, thereby assessing the absorption situation of the new energy power station based on the current absorption warning information and historical absorption warning information, realizing real-time understanding of the absorption situation of the new energy power station, and effectively guiding power grid planning and new energy construction planning. Attached Figure Description

[0044] Figure 1 This is a flowchart illustrating the application of the energy consumption early warning method proposed in this invention for assessing the energy consumption situation in a practical application scenario.

[0045] Figure 2 This is a logical diagram illustrating the evaluation and scheduling strategy of a renewable energy consumption early warning method proposed in this invention in a practical application scenario. Detailed Implementation

[0046] To make the objectives, technical solutions, and advantages of the present invention clearer, the present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments.

[0047] The inventive concept of this invention lies in: by comparing the current intraday power generation plan and the optimized intraday power generation plan, in response to the reduction in power generation output of renewable energy power plants, obtaining the possible future obstruction situations in renewable energy power plants, and realizing the assessment of the renewable energy power plant absorption situation based on current absorption warning information and historical absorption warning information.

[0048] Detailed implementation method 1:

[0049] The present invention provides a method for early warning of renewable energy consumption, which includes steps S11, S12, and S13, specifically:

[0050] The current daily power generation plan is obtained from the new energy spot market in real time. In step S11, the first power generation output generated by the new energy power station according to the current daily power generation plan is analyzed and simulated. During the analysis and simulation, the current daily power generation plan is optimized based on the over-limit results of the new energy power station to generate the current daily optimized power generation plan. Here, the analysis and simulation of the first power generation output generated by the new energy power station according to the current daily power generation plan means that the new energy power station simulates the power generation output according to the current daily power generation plan and combines the grid model parameters to simulate the first power generation output generated by the new energy power station during the simulation. The over-limit results refer to the situation where the section / main transformer / line is overloaded or overloaded during the analysis process. That is, the over-limit results include the judgment results of section over-limit / overload, line over-limit / overload, and main transformer over-limit / overload.

[0051] For each time point in the corresponding power generation plan, compare the current intraday power generation plan with the current intraday optimized power generation plan. In response to the comparison meeting step S12: if the second power generation output generated by the new energy power station according to the current intraday optimized power generation plan is less than the first power generation output, then determine the obstruction cause and obstruction details of the new energy power station, and generate current absorption warning information containing the obstruction cause and obstruction details. It should be noted that when the second power generation output is less than the first power generation output, it indicates that the power generation output of the new energy power station has decreased / obstructed. The obstruction cause includes one or two or more of the following: cross-section over-limit obstruction, main transformer reverse heavy overload, and line reverse heavy overload. Among them, the cross-section over-limit refers to the transmission power of the transmission channel (cross-section) connecting different areas in the power system and undertaking the power transmission task exceeding the limit allowed for its safe and stable operation. The reverse overload of the main transformer refers to the main transformer experiencing overload or overload due to reverse power flow. Overload means the transformer load rate exceeds 80% but does not exceed 100% of its rated capacity; overload means the transformer load rate exceeds 100%. The reverse overload of the line refers to an abnormal operating state where, under specific operating conditions, the load rate of a distribution line exceeds a safe threshold due to the reverse transmission of power from distributed power sources (such as photovoltaics) to the grid.

[0052] Step S13: Assess the renewable energy consumption situation based on the current and historical renewable energy consumption warning information. Here, the historical renewable energy consumption warning information refers to the collection of renewable energy consumption warning information generated based on historical intraday power generation plans and the situation where renewable energy power plants experience power generation disruptions.

[0053] For example, the current absorption warning information is as follows: At the current time (8:00), the renewable energy power stations connected to the main transformer will experience obstruction at 8:15 (the second power generation output of the renewable energy power station according to the current day's optimized power generation plan is less than the first power generation output). In this case, an absorption warning information is generated. The warning information includes the name of the renewable energy power station, the warning time, the obstructed output value (the first power generation output of the renewable energy power station according to the current day's optimized power generation plan minus the second power generation output, and it is greater than zero), and the main transformer to which it belongs (i.e., the reason for the obstruction, that is, a renewable energy power station is adjusted because a certain main transformer is overloaded).

[0054] Historical power consumption warning information: corresponding to the current power consumption warning information, the historical power consumption warning information is the power consumption warning information before the current power consumption warning information. At the same time, as the daily power generation plan is continuously updated, the current power consumption warning information will be stored as historical power consumption warning information.

[0055] Based on historical and current renewable energy consumption warning information, assess the renewable energy consumption situation: Based on the aforementioned historical renewable energy consumption warning information, select the renewable energy consumption situation in the region over the past year, including: ranking of the number of times renewable energy power plants were blocked, ranking of the cumulative output of renewable energy power plants blocked, ranking of the number of times main transformers were blocked at each voltage level (35kV, 110kV, 220kV), and ranking of the cumulative output of main transformers blocked at each voltage level (35kV, 110kV, 220kV).

[0056] As can be seen from the above, the main transformers in the region that rank highest in terms of the number of times they are blocked and the cumulative blocked output need to be prioritized for further expansion and optimization of the power grid, so as to promote the consumption of new energy and reduce the blockage of new energy.

[0057] Through the above steps S11-S13, the current daily power generation plan is analyzed in real time and optimized. By comparing the power generation plans before and after optimization, the future obstruction of new energy power plants is predicted, and a consumption warning signal is issued when obstruction may occur. By analyzing all consumption signals, the consumption of new energy is assessed.

[0058] Method Detailed Implementation 2:

[0059] Following the specific implementation of the above-described method of the present invention, in step S11, the exceeding result is obtained by the following method:

[0060] In the process of analyzing the current intraday power generation plan, power flow calculation is performed based on the current intraday power generation plan to obtain the power flow calculation results; here, the power flow calculation refers to calculating the stable operating parameters such as voltage of each node and branch power of the power grid based on data such as grid topology, power output, and demand.

[0061] Based on the power flow calculation results, it is determined whether the interruption section of the new energy power station has exceeded the limit or is overloaded, whether the main transformer has exceeded the limit or is overloaded, and whether the line has exceeded the limit or is overloaded. The results of the limit exceedance are generated, including the judgment results of the section limit / overload, the line limit / overload, and the main transformer limit / overload. In this case, when judging whether the interruption section of the new energy power station has exceeded the limit or is overloaded, whether the main transformer has exceeded the limit or is overloaded, and whether the line has exceeded the limit or is overloaded, the judgment and calculation can be performed based on parameters such as equipment name, current value, deduced value, limit, and limit exceedance percentage.

[0062] It should be noted that when determining whether a cross-section of a new energy power station has experienced overload or over-limit issues, the judgment is made based on the power flow calculation results of each line / main transformer within the cross-section; when determining whether a main transformer has experienced overload or over-limit issues, the judgment is made based on the power flow calculation results of each side of the main transformer; and when determining whether a line has experienced overload or over-limit issues, the judgment is made based on the power flow calculation results of the active and reactive currents of each line.

[0063] In step 12, the reasons for the obstruction at the new energy power station are determined using the following method:

[0064] In the current intraday optimized power generation plan, a target power generation time in which the second power generation output is reduced compared to the first power generation output is determined; here, the target power generation time may include one, two or more.

[0065] By reviewing the current intraday power generation plan optimization process, the target over-limit results corresponding to the target power generation time are determined.

[0066] The obstructed equipment is identified as the one that causes the overload / overload in the target over-limit result judgment result; the obstructed equipment and its judgment result are identified as the cause of obstruction; here, the obstructed equipment includes one or more of the following: cross section, main transformer, and line; correspondingly, the cause of obstruction includes one or more of the following: cross section over-limit obstruction, main transformer reverse overload, and line reverse overload.

[0067] Meanwhile, in step 12, the obstruction details include power flow information and load factor information of the obstructed equipment before and after optimization; wherein, during the analysis process according to the current intraday power generation plan, the power flow information and load factor information of the obstructed equipment before optimization are calculated.

[0068] During the analysis of the current intraday optimized power generation plan, the power flow information and load rate information of the obstructed equipment are calculated.

[0069] Of course, in practical applications, the information included in the obstruction details will be adjusted according to the cause of the obstruction. The obstruction details also include the obstruction time, obstruction type (section exceeding limit, main transformer reverse heavy overload, line reverse heavy overload), obstructed equipment name, obstructed output of new energy, obstructed output of wind power, obstructed output of photovoltaic power, list of obstructed wind farms, list of obstructed photovoltaic farms, etc. Specifically, no limitation is made in this invention, as long as the obstruction details can reflect, explain and illustrate the cause of the obstruction.

[0070] For example, when the obstruction is caused by exceeding the limit of the cross section, the obstruction details are obtained based on the power flow information and load rate information of the cross section before and after optimization, and two warning messages are generated as shown in Table 1 below:

[0071]

[0072] Table 1

[0073] Method Detailed Implementation 3:

[0074] Next, in the specific implementation of the above method of the present invention, the intraday power generation plan is optimized in step S11 by the following steps: 1) Based on the target limit exceedance result and the target intraday power generation plan, a preset scheduling strategy is invoked to generate an optimized target intraday power generation plan; the preset scheduling strategy refers to the strategy of adjusting the target intraday power generation plan based on the analysis of the target intraday power generation plan and the target limit exceedance result.

[0075] 2) Perform power flow calculation based on the optimized target intraday power generation plan to obtain the target power flow calculation results; based on the target power flow calculation results, determine whether the interruption section of the new energy power station has exceeded the limit or is overloaded, determine whether the main transformer has exceeded the limit or is overloaded, and determine whether the line has exceeded the limit or is overloaded.

[0076] 3) If any judgment result in 2) results in an overload or over-limit, then generate the latest target overload result based on the judgment result in 2); and determine the optimized target intraday power generation plan as the latest target intraday power generation plan; continue to execute 1) and 2) based on the latest target overload result and the latest target intraday power generation plan until all judgment results in 2) result in no overload or over-limit, and determine the optimized target intraday power generation plan in 2) as the intraday optimized power generation plan, so as to continuously optimize the power generation plan until the optimized power generation plan meets the grid safety verification requirements.

[0077] like Figure 1 The diagram shows a flowchart of a method for assessing the absorption of new energy sources proposed in this invention in a practical application scenario. The method involves obtaining the latest intraday power generation plan (i.e., the current intraday power generation plan) from the spot market and performing a preliminary analysis of the first power generation output of the new energy power plant based on the intraday power generation plan and grid model parameters.

[0078] During the analysis and simulation process, power flow calculations are performed based on the intraday power generation plan, and it is determined whether the interruption section of the renewable energy power station / main transformer / line has exceeded the limit or been overloaded (i.e., whether the interruption section of the renewable energy power station has exceeded the limit or been overloaded, whether the main transformer has exceeded the limit or been overloaded, and whether the line has exceeded the limit or been overloaded). If so, the intraday power generation plan is optimized based on the limit result and the intraday power generation plan, and by calling the preset scheduling strategy.

[0079] During the optimization process, power flow calculations are continuously performed on the optimized intraday power generation plan until the latest optimized intraday power generation plan does not result in any over-limit or overload of sections / main transformers / lines in the new energy power station. The latest optimized intraday power generation plan is then determined as the intraday optimized power generation plan.

[0080] By comparing the intraday power generation plan and the intraday optimized power generation plan, and taking the decrease in power generation output of new energy power plants as the starting point, the reasons for the obstruction of power generation output of new energy power plants and the details of the obstruction are obtained, and the absorption warning information containing the reasons for the obstruction and the details of the obstruction is generated. The obstruction reasons may be one or more of the following: cross-section exceeding the limit, main transformer reverse heavy overload, and line reverse heavy overload.

[0081] Method Detailed Implementation 4:

[0082] In practical applications of this invention, combined with real-time scheduling and spot market scenarios, this invention proposes a method for assessing the consumption of new energy sources and providing early warnings. The method includes: First, since the spot market generates a daily power generation plan containing 96 data points for the next 0 to 24 hours every 15 minutes, the latest daily power generation plan is obtained from the spot market.

[0083] Secondly, based on the latest intraday power generation plan, and combined with the grid model parameters, power flow calculations and real-time verifications are performed on the intraday power generation plan, which includes 96 data points covering the next 24 hours. Based on the power flow calculation results, the overload / over-limit status of new energy power plant sections, lines, and main transformers are determined. Specifically, the determination is made based on equipment name, current value, projected value, limit value, and percentage of overload.

[0084] Next, based on the intraday power generation plan, the over-limit results obtained during the analysis and simulation process, and the results based on power flow calculation, the intraday power generation plan is optimized in real time to generate an optimized intraday power generation plan. At the same time, the analysis and simulation are called to perform power flow calculation to meet the requirements of power grid safety verification.

[0085] Finally, based on the obstruction of renewable energy consumption between the intraday power generation plan and the intraday optimized power generation plan, the causes and details of the obstruction at renewable energy power plants are analyzed, and corresponding consumption warning information is generated. The consumption warning information includes cross-section overload consumption warning, main transformer reverse heavy overload consumption warning, and line reverse heavy overload consumption warning. The obstruction details specifically include the obstruction time, obstruction type (i.e., obstruction cause), obstructed equipment name, renewable energy output obstructed, wind power output obstructed, photovoltaic output obstructed, obstructed wind farm list, obstructed photovoltaic farm list, etc.

[0086] Method Detailed Implementation 5:

[0087] In this invention, after optimizing the intraday power generation plan through a preset scheduling strategy, an optimized intraday power generation plan is generated. By comparing the optimized intraday power generation plan and the intraday power generation plan, not only can the absorption warning information be obtained, but the preset scheduling strategy can also be evaluated based on the absorption warning information.

[0088] like Figure 2 The diagram illustrates the logic of a new energy consumption early warning method proposed in this invention, used to evaluate the consumption status of renewable energy, in a practical application scenario for assessing dispatch strategies. The daily power generation plan is input from an external system (generally the spot market). The optimized daily power generation plan is a further optimization of the daily power generation plan by the intelligent dispatch module of this system based on the analyzed and simulated power flow calculation results. The output is calculated by subtracting the two plans (selecting the renewable energy power station's power generation plan; subtracting the optimized daily power generation plan from the daily power generation plan, and a positive difference indicates that the renewable energy power station is experiencing consumption obstruction). This includes the obstruction time, obstructed equipment, obstruction type, expected total obstructed renewable energy output, expected obstructed renewable energy power today, number of obstructed power stations, and a list of obstructed power stations. Finally, the dispatch strategy is assessed, including the current planned total obstructed power (i.e., the sum of renewable energy obstructed power caused by the optimized daily power generation plan through intelligent dispatch) and current planned obstruction details (including the total obstructed power and details of all cross-section overloads, all main transformer reverse overloads, and all line reverse overloads).

[0089] While assessing the absorption of new energy in real time, the system also evaluates the effectiveness of dispatching strategies, using quantitative indicators to show the impact of the current dispatching strategy on the obstruction of new energy absorption. It combines the causes and results of obstruction to reflect the one-to-one temporal relationship between dispatching strategies and new energy obstruction in real time, providing dispatchers with an intuitive view of the current new energy absorption warning situation. Based on historical statistics from online assessments, it can perform retrospective analysis of dispatching optimization strategies and provide suggestions for optimizing new energy dispatching. Taking the optimization strategy for cross-section over-limit as an example, possible optimization points include: (a) The default dispatching optimization strategy is to immediately adjust the power generation plan when encountering cross-section over-limit; an optimization suggestion can be proposed: adjust the power generation plan only when there are two consecutive 15-minute over-limits. Simultaneously, the system quantifies the analysis of new energy absorption obstruction through absorption warning assessment. Grid safety and stability are assessed by intelligent dispatching and analysis pre-simulation, ultimately combining the two quantitative indicators of new energy absorption and grid safety and stability to jointly determine the dispatching strategy. (b) The default threshold is fixed, but it can be optimized to a dynamic threshold, such as 100% for the next 0-1 hour and 105% for the next 1-4 hours. At the same time, the analysis of the obstruction of new energy consumption is given through quantitative assessment of the consumption early warning. The grid security and stability are assessed by intelligent dispatch and analysis and simulation. Finally, the dispatch strategy is determined by combining the two quantitative indicators of new energy consumption and grid security and stability.

[0090] Method Detailed Implementation 6:

[0091] The principle of the absorption early warning method for assessing the absorption of new energy proposed in this invention is as follows: Based on the intraday power generation plan of the spot market, the intraday optimized power generation plan after real-time scheduling optimization, and the real-time scheduling optimization process, the starting point is the decrease in power generation output of new energy power plants (i.e., the output of new energy power plants is reduced compared with the intraday optimized power generation plan). At the same time, the reasons for adjusting the output of the power plant (i.e., the reasons for the obstruction: cross-section overload / main transformer reverse heavy overload / line reverse heavy overload) and the detailed information of the corresponding equipment (i.e., obstruction details) are obtained.

[0092] Detailed implementation of the equipment:

[0093] On the other hand, the present invention also proposes a renewable energy consumption early warning device for assessing renewable energy consumption, comprising a processor, the processor being used to execute the following method steps: analyzing and rehearsing the first power output generated by renewable energy power plants according to the current intraday power generation plan; during the analysis and rehearsal process, optimizing the current intraday power generation plan based on the over-limit results of renewable energy power plants to generate an optimized intraday power generation plan; if the second power output generated by renewable energy power plants according to the optimized intraday power generation plan is reduced compared to the first power output, then determining the obstruction cause and obstruction details of the renewable energy power plants, and generating current consumption early warning information containing the obstruction cause and obstruction details; assessing the renewable energy consumption situation based on the current consumption early warning information and historical consumption early warning information.

[0094] Specifically,

[0095] The overload results are obtained through the following method: During the analysis of the current daily power generation plan, power flow calculation is performed based on the current daily power generation plan to obtain the power flow calculation results; based on the power flow calculation results, it is determined whether the cross section of the new energy power station has an overload or overload, whether the main transformer has an overload or overload, and whether the line has an overload or overload, generating an overload result that includes the judgment results of the cross section overload / overload, the judgment results of the line overload / overload, and the judgment results of the main transformer overload / overload.

[0096] The following method is used to determine the cause of obstruction at renewable energy power plants: In the current intraday optimized power generation plan, determine the target power generation time when the second power generation output is reduced compared to the first power generation output; Backtrack the current intraday power generation plan optimization process to determine the target over-limit result corresponding to the target power generation time; Identify the obstructed equipment whose judgment result among the target over-limit results indicates over-limit / overload; Determine the obstructed equipment and its judgment result as the cause of obstruction; wherein, the cause of obstruction includes one or more of the following: cross-section over-limit obstruction, main transformer reverse overload, and line reverse overload.

[0097] The obstruction details include power flow information and load factor information of the obstructed equipment before and after optimization; wherein, during the analysis according to the current intraday power generation plan, the power flow information and load factor information of the obstructed equipment before optimization are calculated; during the analysis according to the current intraday optimized power generation plan, the power flow information and load factor information of the obstructed equipment after optimization are calculated.

[0098] In addition, the current daily power generation plan will be optimized through the following steps:

[0099] 1) Based on the target overload result and the target intraday power generation plan, invoke the preset scheduling strategy to generate an optimized target intraday power generation plan; 2) Perform power flow calculation based on the optimized target intraday power generation plan to obtain the target power flow calculation result; based on the target power flow calculation result, determine whether the interruption section of the new energy power station has overload or overload, whether the main transformer has overload or overload, and whether the line has overload or overload; 3) If any judgment result in 2) indicates overload or overload, generate the latest target overload result based on the judgment result in 2); and determine the optimized target intraday power generation plan as the latest target intraday power generation plan; continue to execute 1) and 2) based on the latest target overload result and the latest target intraday power generation plan until all judgment results in 2) indicate no overload or overload, and determine the optimized target intraday power generation plan in 2) as the intraday optimized power generation plan.

[0100] For details on the specific implementation of the device, please refer to Implementation Methods 1-6, which will not be repeated here.

[0101] In summary, the purpose of this invention is to provide a method and device for assessing the absorption and early warning of renewable energy, which assesses the absorption and dispatching strategies of renewable energy in real time by providing early warnings of potential future disruptions to renewable energy power plants. The main components include: an analysis and simulation function for verifying the daily power generation plan; an intelligent dispatching function for optimizing the daily power generation plan and generating a new optimized daily power generation plan; and, based on the initial daily power generation plan and the optimized daily power generation plan, analysis of three types of disruption scenarios is performed, and absorption and early warning information is generated based on these scenarios to assess the absorption of renewable energy.

[0102] 1. Cross-section overload absorption early warning function: used for real-time assessment of the power output obstruction caused by cross-section overload. 2. Main transformer reverse heavy overload absorption early warning function: used for real-time assessment of the power output obstruction caused by reverse heavy overload of 220kV and below main transformers. 3. Line reverse heavy overload absorption early warning function: used for real-time assessment of the power output obstruction caused by reverse heavy overload of 220kV and below lines.

Claims

1. A method for early warning of renewable energy consumption, characterized in that, include: Analyze and simulate the initial power output of the new energy power station according to the current daily power generation plan; During the analysis and simulation process, the current daily power generation plan is optimized based on the over-limit results of the new energy power plants, and the current daily optimized power generation plan is generated. If the second power output generated by the new energy power station according to the current daily optimized power generation plan is less than the first power output, then the cause and details of the obstruction of the new energy power station are determined, and a current consumption warning information containing the cause and details of the obstruction is generated. Assess the renewable energy consumption situation based on current and historical consumption warning information.

2. The method for early warning of renewable energy consumption as described in claim 1, characterized in that, The out-of-limit result is obtained through the following method: In the process of analyzing the current intraday power generation plan, power flow calculation is performed based on the current intraday power generation plan to obtain the power flow calculation results; Based on the power flow calculation results, it is determined whether the cross section of the new energy power station has exceeded the limit or is overloaded, whether the main transformer has exceeded the limit or is overloaded, and whether the line has exceeded the limit or is overloaded. The result of exceeding the limit is generated, which includes the judgment results of the cross section, the judgment results of the line, and the judgment results of the main transformer.

3. The method for early warning of renewable energy consumption according to claim 2, characterized in that, The following methods were used to determine the reasons for the obstruction of new energy power stations: In the current intraday optimized power generation plan, determine the target power generation time for which the second power generation output is reduced compared to the first power generation output; By reviewing the current intraday power generation plan optimization process, we can determine the target limit exceedance results corresponding to the target power generation time. Identify the obstructed equipment that caused the overload / overload in the target over-limit results; determine the obstructed equipment and its judgment result as the cause of the obstruction; The reasons for the obstruction include one or more of the following: cross-section exceeding the limit, main transformer reverse overload, and line reverse overload.

4. The method for early warning of renewable energy consumption as described in claim 3, characterized in that, The obstruction details include power flow information and load rate information of the obstructed equipment before and after optimization; wherein... During the analysis based on the current intraday power generation plan, the power flow information and load rate information of the obstructed equipment before optimization are calculated; During the analysis of the current intraday optimized power generation plan, the power flow information and load rate information of the obstructed equipment are calculated.

5. The method for early warning of renewable energy consumption according to claim 1, characterized in that, The current daily power generation plan can be optimized using the following steps: 1) Based on the target limit exceedance results and the target day's power generation plan, invoke the preset scheduling strategy to generate an optimized target day's power generation plan; 2) Perform power flow calculations based on the optimized target intraday power generation plan to obtain the target power flow calculation results; Based on the target power flow calculation results, determine whether the interruption section of the new energy power station has exceeded the limit or been overloaded, whether the main transformer has exceeded the limit or been overloaded, and whether the line has exceeded the limit or been overloaded. 3) If any judgment result in 2) results in an overload or over-limit, then based on the judgment result in 2), generate the latest target overload result; and determine the optimized target intraday power generation plan as the latest target intraday power generation plan; Based on the latest target over-limit results and the latest target intraday power generation plan, continue to execute 1) and 2) until all judgment results in 2) show no over-limit or overload, and then determine the optimized target intraday power generation plan in 2) as the intraday optimized power generation plan.

6. A consumption early warning device for assessing the consumption of new energy sources, characterized in that, Includes a processor, the processor being configured to perform the following method steps: The analysis and simulation of the first power generation output of the new energy power station according to the current daily power generation plan are carried out. During the analysis and simulation, the current daily power generation plan is optimized based on the over-limit results of the new energy power station, and the current daily optimized power generation plan is generated. If the second power output generated by the new energy power station according to the current daily optimized power generation plan is less than the first power output, then the cause and details of the obstruction of the new energy power station are determined, and a current consumption warning information containing the cause and details of the obstruction is generated. Assess the renewable energy consumption situation based on current and historical consumption warning information.

7. The energy consumption early warning device for assessing the energy consumption situation according to claim 6, characterized in that, The out-of-limit result is obtained through the following method: In the process of analyzing the current intraday power generation plan, power flow calculation is performed based on the current intraday power generation plan to obtain the power flow calculation results; Based on the power flow calculation results, it is determined whether the cross section of the new energy power station has exceeded the limit or is overloaded, whether the main transformer has exceeded the limit or is overloaded, and whether the line has exceeded the limit or is overloaded. The result of exceeding the limit is generated, which includes the judgment results of the cross section, the judgment results of the line, and the judgment results of the main transformer.

8. The energy consumption early warning device for assessing the energy consumption situation according to claim 7, characterized in that, The following methods were used to determine the reasons for the obstruction of new energy power stations: In the current intraday optimized power generation plan, determine the target power generation time for which the second power generation output is reduced compared to the first power generation output; By reviewing the current intraday power generation plan optimization process, we can determine the target limit exceedance results corresponding to the target power generation time. Identify the obstructed equipment that caused the overload / overload in the target over-limit results; determine the obstructed equipment and its judgment result as the cause of the obstruction; The reasons for the obstruction include one or more of the following: cross-section exceeding the limit, main transformer reverse overload, and line reverse overload.

9. The energy consumption early warning device for assessing the energy consumption situation according to claim 8, characterized in that, The obstruction details include power flow information and load rate information of the obstructed equipment before and after optimization; wherein... During the analysis based on the current intraday power generation plan, the power flow information and load rate information of the obstructed equipment before optimization are calculated; During the analysis of the current intraday optimized power generation plan, the power flow information and load rate information of the obstructed equipment are calculated.

10. The energy consumption early warning device for assessing the energy consumption situation according to claim 6, characterized in that, The current daily power generation plan can be optimized using the following steps: 1) Based on the target limit exceedance results and the target day's power generation plan, invoke the preset scheduling strategy to generate an optimized target day's power generation plan; 2) Perform power flow calculations based on the optimized target intraday power generation plan to obtain the target power flow calculation results; Based on the target power flow calculation results, determine whether the interruption section of the new energy power station has exceeded the limit or been overloaded, whether the main transformer has exceeded the limit or been overloaded, and whether the line has exceeded the limit or been overloaded. 3) If any judgment result in 2) results in an overload or over-limit, then based on the judgment result in 2), generate the latest target overload result; and determine the optimized target intraday power generation plan as the latest target intraday power generation plan; Based on the latest target over-limit results and the latest target intraday power generation plan, continue to execute 1) and 2) until all judgment results in 2) show no over-limit or overload, and then determine the optimized target intraday power generation plan in 2) as the intraday optimized power generation plan.

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