Power grid supply and demand balance analysis method and system based on large-scale pumping storage output analysis

Abstract

The application discloses a kind of power grid supply-demand balance analysis methods based on large-scale pumping storage output analysis, including obtaining the data information of target power system;Power gain and loss data information of target power system is calculated without considering energy storage and pumping storage output;Pumped storage chargeable electric quantity data information and electric quantity gap data information without considering pumping storage charging and discharging condition are calculated;The scene of pumped storage participation target power system supply-demand balance is analyzed;Supply-demand balance analysis index of target power system is calculated, and the power grid supply-demand balance analysis based on large-scale pumping storage output analysis of target power system is completed.The application also discloses a kind of system for realizing the power grid supply-demand balance analysis based on large-scale pumping storage output analysis method.The application not only realizes the analysis of power grid supply-demand balance, but also has higher reliability and better accuracy.

Description

Technical Field

[0001] This invention belongs to the field of electrical automation, specifically relating to a method and system for power grid supply and demand balance analysis based on large-scale pumped storage power output analysis. Background Technology

[0002] With economic and technological development and the improvement of people's living standards, electricity has become an indispensable secondary energy source in people's production and daily life, bringing endless convenience. Therefore, ensuring a stable and reliable supply of electricity has become one of the most important tasks of the power system.

[0003] Currently, an increasing number of new energy power generation systems are being integrated into the power grid and generating electricity. The randomness, intermittency, and volatility of these new energy power generation systems pose significant challenges to the safe and stable operation of the power system. Therefore, the power system is beginning to adopt a large number of energy storage systems to address these challenges.

[0004] In current large-scale energy storage systems, pumped storage units are the most widely used, technologically mature, and have the largest installed capacity, offering advantages such as large capacity, long lifespan, cost-effectiveness, rapid response, and environmental friendliness. However, current schemes for incorporating pumped storage into power system balance analysis still have shortcomings: existing schemes often focus on optimizing the technical parameters of individual pumped storage power plants, lacking analysis of the output patterns of "large-scale pumped storage," thus resulting in relatively poor reliability and accuracy. Summary of the Invention

[0005] One of the objectives of this invention is to provide a highly reliable and accurate power grid supply and demand balance analysis method based on large-scale pumped storage power output analysis.

[0006] The second objective of this invention is to provide a system for implementing the power grid supply and demand balance analysis method based on large-scale pumped storage power output analysis.

[0007] The power grid supply and demand balance analysis method based on large-scale pumped storage output analysis provided by this invention includes the following steps:

[0008] S1. Obtain data information about the target power system;

[0009] S2. Based on the data obtained in step S1, and considering the power balance requirements of the target power system, calculate the power surplus and deficit data of the target power system without considering energy storage and pumped storage output.

[0010] S3. Based on the data obtained in step S2, calculate the rechargeable energy data of the pumped storage and the energy gap data without considering the charging and discharging conditions of the pumped storage.

[0011] S4. Based on the data obtained in step S3, analyze the scenarios in which pumped storage participates in the supply and demand balance of the target power system;

[0012] S5. Based on the analysis results obtained in step S4, calculate the supply and demand balance analysis index of the target power system;

[0013] S6. Based on the data obtained in step S5, complete the power grid supply and demand balance analysis of the target power system based on large-scale pumped storage output analysis.

[0014] Step S1, which involves acquiring data information about the target power system, specifically includes the following steps:

[0015] Acquire data information from the target power system;

[0016] The data information includes the target power system's system load, thermal power output data, hydropower output data, AC tie-line power data, ultra-high voltage DC power data, new energy output data, electrochemical output data, pumped storage output data, system power supply capacity data, thermal power unit power supply capacity data, and hydropower unit power supply capacity data.

[0017] Step S2, based on the data obtained in step S1 and the power balance requirements of the target power system, calculates the power surplus / deficit data of the target power system without considering energy storage and pumped storage output. This specifically includes the following steps:

[0018] The following formula is used as the power balance expression for the target power system:

[0019] In the formula The load of the target power system under typical high-load conditions at time t; The thermal power output of the target power system under typical high load conditions at time t; The hydropower output of the target power system under typical high load conditions at time t; The AC tie-line power of the target power system under typical high-load conditions at time t; The ultra-high voltage DC power of the target power system under typical high load conditions at time t; The renewable energy output of the target power system under typical high load conditions at time t; The electrochemical output of the target power system under typical high load conditions at time t; The pumped storage capacity of the target power system under typical high load conditions at time t;

[0020] The maximum power supply capacity of the target power system under the set typical high load mode is calculated using the following formula:

[0021] In the formula The maximum power supply capacity of the target power system under typical high load conditions at time t; The maximum power supply capacity of thermal power units in the target power system under typical high load conditions at time t. The maximum hydropower supply capacity of the target power system under typical high-load conditions at time t;

[0022] The power surplus / deficit data of the target power system at time t are calculated without considering energy storage and pumped storage output. for ;in, This indicates that the target power system has a power surplus at time t. This indicates that the target power system is in a power deficit state at time t.

[0023] Step S3, which involves calculating the rechargeable energy data of the pumped storage facility and the energy gap data without considering the charging and discharging conditions of the pumped storage facility based on the data information obtained in step S2, specifically includes the following steps:

[0024] Electrochemical energy storage is converted into pumped storage capacity based on its corresponding capacity and charge / discharge duration.

[0025] Based on the data obtained in step S2, when At that time, the pumped chargeable capacity was calculated. for ;

[0026] Based on the data obtained in step S2, when The following formula is used to calculate the power deficit value during the set peak load period, without considering the charging and discharging of pumped storage. for ;

[0027] Meanwhile, the charging and discharging power of the pumped storage power station meets the following requirements:

[0028] In the formula This refers to the rated discharge capacity of the pumped storage power station. The charging and discharging efficiency of a pumped storage power station; This refers to the rated charging capacity of the pumped storage power station.

[0029] Step S4 involves analyzing the scenario of pumped storage participating in the supply and demand balance of the target power system based on the data information obtained in step S3. This specifically includes the following steps:

[0030] The scenarios in which pumped storage participates in the supply and demand balance of the target power system include the following four scenarios:

[0031] Scenario 1: The pumped-storage hydroelectric power generation during the designated off-peak load period can meet the power shortage of the target power system during the designated peak load period, and the output of the pumped-storage hydroelectric power station can meet the maximum power shortage during the designated peak load period; expressed as:

[0032] In the formula The maximum power shortage during the designated peak load period;

[0033] At this time, the theoretical output coefficient of the pumped storage power station Represented as ;in The pumped storage capacity of the target power system;

[0034] When performing supply and demand balance analysis of the target power system, when the actual output coefficient of the pumped storage power station... satisfy At that time, the target power system can meet the power supply demand;

[0035] Scenario 2: The pumped-storage hydroelectric power generation during the designated off-peak load period can meet the power shortage of the target power system during the designated peak load period, but the output of the pumped-storage hydroelectric power station cannot meet the maximum power shortage during the designated peak load period; this is expressed as:

[0036] When performing supply and demand balance analysis of the target power system, the actual output coefficient of the pumped storage power station The calculation formula is ;

[0037] Scenario 3: The pumped storage power generation during the designated off-peak load period cannot meet the power shortage of the target power system during the designated peak load period, but the output of the pumped storage power station can meet the maximum power shortage during the designated peak load period; this is expressed as:

[0038] Scenario 4: The pumped-storage power generation capacity during the designated off-peak load period is insufficient to meet the power shortage of the target power system during the designated peak load period, and the output of the pumped-storage power station is insufficient to meet the maximum power shortage during the designated peak load period; this is expressed as:

[0039] For scenarios 3 and 4: The following formula is used to analyze the output coefficient of the pumped storage power station:

[0040] In the formula This refers to the maximum peak output of a pumped storage power station during a set peak load period. This represents the maximum output coefficient of a pumped storage power station during a designated peak load period.

[0041] Therefore, during the designated peak load period, the output of the pumped storage power station... satisfy:

[0042] At this point, the power balance is satisfied. .

[0043] Step S5, which calculates the supply and demand balance analysis index of the target power system based on the analysis results obtained in step S4, specifically includes the following steps:

[0044] The following formula is used to calculate the remaining power deficit in the power grid after considering the support of pumped storage power stations. : st

[0045] The following formula is used to calculate the maximum power shortage and the cumulative power consumption for the overall power outage duration after considering the support of pumped storage power stations. : st

[0046] In the formula This refers to the power outage period during peak load times.

[0047] The supply and demand balance analysis indicators of the target power system were calculated. for .

[0048] Step S6, which involves performing a grid supply and demand balance analysis of the target power system based on large-scale pumped storage capacity analysis using the data obtained in step S5, specifically includes the following steps:

[0049] Based on the obtained supply and demand balance analysis indicators of the target power system To conduct grid supply and demand balance analysis of the target power system based on large-scale pumped storage output analysis:

[0050] like If so, it is determined that the target power system has a power shortage greater than the set threshold during the set peak load period;

[0051] like If so, it is determined that the target power system has a power shortage greater than the set threshold during the set peak load period;

[0052] The set state threshold.

[0053] This invention also provides a system for implementing the power grid supply and demand balance analysis method based on large-scale pumped storage output analysis, comprising a data acquisition module, a profit and loss calculation module, a gap calculation module, a scenario analysis module, a balance calculation module, and a balance analysis module; the data acquisition module, profit and loss calculation module, gap calculation module, scenario analysis module, balance calculation module, and balance analysis module are connected in series; the data acquisition module is used to acquire data information of the target power system and upload the data information to the profit and loss calculation module; the profit and loss calculation module is used to calculate the power profit and loss data information of the target power system without considering energy storage and pumped storage output based on the received data information and the acquired data information, and based on the power balance requirements of the target power system, and upload the data information to the gap calculation module; the gap calculation module... The first module calculates the rechargeable capacity of the pumped storage system and the power gap without considering the charging and discharging conditions of the pumped storage system based on the received and obtained data, and uploads the data to the scenario analysis module. The scenario analysis module analyzes the scenarios in which the pumped storage system participates in the supply and demand balance of the target power system based on the received and obtained data, and uploads the data to the balance calculation module. The balance calculation module calculates the supply and demand balance analysis indicators of the target power system based on the received and obtained data, and uploads the data to the balance analysis module. The balance analysis module performs a grid supply and demand balance analysis of the target power system based on the large-scale pumped storage output analysis based on the received and obtained data.

[0054] The present invention provides a power grid supply and demand balance analysis method and system based on large-scale pumped storage output analysis. By analyzing and calculating the output of large-scale pumped storage and the scenario in which pumped storage participates in the supply and demand balance of the target power system, it not only realizes the analysis of power grid supply and demand balance, but also has higher reliability and better accuracy. Attached Figure Description

[0055] Figure 1 This is a schematic diagram of the method flow of the present invention.

[0056] Figure 2 This is a schematic diagram of the functional modules of the system of the present invention. Detailed Implementation

[0057] like Figure 1 The diagram shown is a flowchart of the method of the present invention: The power grid supply and demand balance analysis method based on large-scale pumped storage output analysis disclosed in this invention includes the following steps:

[0058] S1. Obtain data information of the target power system; specifically including the following steps:

[0059] Acquire data information from the target power system;

[0060] The data information includes the target power system's system load, thermal power output data, hydropower output data, AC tie-line power data, ultra-high voltage DC power data, new energy output data, electrochemical output data, pumped storage output data, system power supply capacity data, thermal power unit power supply capacity data, and hydropower unit power supply capacity data.

[0061] S2. Based on the data obtained in step S1, and considering the power balance requirements of the target power system, calculate the power surplus / deficit data of the target power system without considering energy storage and pumped storage output; specifically, this includes the following steps:

[0062] The following formula is used as the power balance expression for the target power system:

[0063] In the formula The load of the target power system under typical high-load conditions at time t; The thermal power output of the target power system under typical high load conditions at time t; The hydropower output of the target power system under typical high load conditions at time t; The AC tie-line power of the target power system under typical high-load conditions at time t; The ultra-high voltage DC power of the target power system under typical high load conditions at time t; The renewable energy output of the target power system under typical high load conditions at time t; The electrochemical output of the target power system under typical high load conditions at time t; The pumped storage capacity of the target power system under typical high load conditions at time t;

[0064] The maximum power supply capacity of the target power system under the set typical high load mode is calculated using the following formula:

[0065] In the formula The maximum power supply capacity of the target power system under typical high load conditions at time t; The maximum power supply capacity of thermal power units in the target power system under typical high load conditions at time t. The maximum hydropower supply capacity of the target power system under typical high-load conditions at time t;

[0066] The power surplus / deficit data of the target power system at time t are calculated without considering energy storage and pumped storage output. for ;in, This indicates that the target power system has a power surplus at time t (which can be used for energy storage and charging). This indicates that the target power system is in a power deficit state at time t (and needs to satisfy the system's supply and demand balance through energy storage discharge).

[0067] S3. Based on the data obtained in step S2, calculate the rechargeable capacity data of the pumped storage and the capacity gap data without considering the charging and discharging conditions of the pumped storage; specifically including the following steps:

[0068] Electrochemical energy storage is converted into pumped storage capacity based on its corresponding capacity and charge / discharge duration.

[0069] Based on the data obtained in step S2, when At that time, the pumped chargeable capacity was calculated. for ;

[0070] Based on the data obtained in step S2, when The following formula is used to calculate the power deficit value during the set peak load period, without considering the charging and discharging of pumped storage. for ;

[0071] Meanwhile, the charging and discharging power of the pumped storage power station meets the following requirements:

[0072] In the formula This refers to the rated discharge capacity of the pumped storage power station. The charging and discharging efficiency of a pumped storage power station; This refers to the rated charging capacity of the pumped storage power station.

[0073] S4. Based on the data obtained in step S3, analyze the scenario of pumped storage participating in the supply and demand balance of the target power system; specifically including the following steps:

[0074] The scenarios in which pumped storage participates in the supply and demand balance of the target power system include the following four scenarios:

[0075] Scenario 1: The pumped-storage hydroelectric power generation during the designated off-peak load period can meet the power shortage of the target power system during the designated peak load period, and the output of the pumped-storage hydroelectric power station can meet the maximum power shortage during the designated peak load period; expressed as:

[0076] In the formula The maximum power shortage during the designated peak load period;

[0077] At this time, the theoretical output coefficient of the pumped storage power station Represented as ;in The pumped storage capacity of the target power system;

[0078] When performing supply and demand balance analysis of the target power system, when the actual output coefficient of the pumped storage power station... satisfy At that time, the target power system can meet the power supply demand;

[0079] Scenario 2: The pumped-storage hydroelectric power generation during the designated off-peak load period can meet the power shortage of the target power system during the designated peak load period, but the output of the pumped-storage hydroelectric power station cannot meet the maximum power shortage during the designated peak load period; this is expressed as:

[0080] When performing supply and demand balance analysis of the target power system, the actual output coefficient of the pumped storage power station The calculation formula is ;

[0081] Scenario 3: The pumped storage power generation during the designated off-peak load period cannot meet the power shortage of the target power system during the designated peak load period, but the output of the pumped storage power station can meet the maximum power shortage during the designated peak load period; this is expressed as:

[0082] Scenario 4: The pumped-storage power generation capacity during the designated off-peak load period is insufficient to meet the power shortage of the target power system during the designated peak load period, and the output of the pumped-storage power station is insufficient to meet the maximum power shortage during the designated peak load period; this is expressed as:

[0083] For scenarios 3 and 4: This will inevitably result in a power and energy shortage. The following formula is used to analyze the output coefficient of the pumped storage power station:

[0084] In the formula This refers to the maximum peak output of a pumped storage power station during a set peak load period. This represents the maximum output coefficient of a pumped storage power station during a designated peak load period.

[0085] Therefore, during the designated peak load period, the output of the pumped storage power station... satisfy:

[0086] At this point, the power balance is satisfied. ;

[0087] S5. Based on the analysis results obtained in step S4, calculate the supply and demand balance analysis indicators of the target power system; specifically, this includes the following steps:

[0088] The following formula is used to calculate the remaining power deficit in the power grid after considering the support of pumped storage power stations. : st

[0089] The following formula is used to calculate the maximum power shortage and the cumulative power consumption for the overall power outage duration after considering the support of pumped storage power stations. : st

[0090] In the formula This refers to the power outage period during peak load times.

[0091] The supply and demand balance analysis indicators of the target power system were calculated. for ;

[0092] S6. Based on the data obtained in step S5, complete the power grid supply and demand balance analysis of the target power system based on large-scale pumped storage capacity analysis; specifically including the following steps:

[0093] Based on the obtained supply and demand balance analysis indicators of the target power system To conduct grid supply and demand balance analysis of the target power system based on large-scale pumped storage output analysis:

[0094] like If the target power system has a power shortage exceeding the set threshold during the set peak load period, it is determined that the target power system has such a shortage. In practice, it is recommended that the target power system add a power source that can provide stable power to improve the power grid's power supply capacity.

[0095] like If the target power system has a power shortage greater than the set threshold during the set peak load period, it indicates that the peak load period is mainly characterized by peak load and the power shortage is small. In specific implementation, it is recommended to solve the short-term load shortage problem by configuring a certain amount of energy storage or temporarily purchasing external power.

[0096] The set state threshold is preferably set to 0.5.

[0097] The method of the present invention will be further illustrated by the following embodiment:

[0098] Taking a typical summer high-load day (24 hours, one time period per hour, for a total of 24 time periods) of a provincial power grid as the research scenario, and combining the power grid's power structure of "thermal power as the main source, high penetration of new energy sources, and seasonal output of hydropower", we supplemented the simulation examples to verify the practicality of the pumped storage power output coefficient calculation and supply-demand balance assessment methods.

[0099] 1. Basic parameter settings (typical summer high-load day):

[0100] System load curve During off-peak hours (2:00-6:00), the load is 28-30 million kilowatts; during peak hours (11:00-14:00, 18:00-21:00), the load is 48-51.5 million kilowatts, with the maximum load... The capacity is 51.5 million kilowatts;

[0101] Thermal power output curve Rated maximum output is 38 million kilowatts. With stable operation, considering a minimum technical output of 0.3 kilowatts, the minimum output is 12 million kilowatts. 38 million kilowatts;

[0102] Hydropower output curve During the summer high-water season, the power output remains stable at 4 million kilowatts, with no fluctuations in any time period. 4 million kilowatts;

[0103] New energy power output curve Wind power (high output at night, 1.5-2 million kilowatts from 6:00 to 8:00 and 18:00 to 22:00) + photovoltaic power (high output during the day, 3-4 million kilowatts from 9:00 to 16:00), with a total output fluctuation range of 80-4 million kilowatts;

[0104] Connecting lines and ultra-high voltage direct current / Considering the current power generation characteristics of AC interconnection lines and UHVDC transmission lines at the sending end, during off-peak hours... For 2 million kilowatts, 10 million kilowatts; off-peak hours For 1 million kilowatts, 5 million kilowatts;

[0105] Electrochemical energy storage Capacity 500,000 kW / 1,000,000 kWh (charge / discharge efficiency 90%), converted to rechargeable capacity of pumped storage is: The rated capacity is 1 million kWh (based on a pumped storage charging and discharging efficiency of 85%); the pumped storage capacity is set at 6 million kW, with a rated charging capacity of 24 million kWh (based on a 4-hour charging time), and the rated charging power / rated discharging power = 6 million kW.

[0106] The province's peak load period focuses on the peak hours when load is highest and renewable energy output is lowest (18:00~21:00), denoted as... During off-peak hours, focus on the period with the lowest load and the highest output of renewable energy (wind power) (2:00~6:00). ;

[0107] 2. Supply and demand balance analysis of the system without considering pumped storage:

[0108] The cumulative power surplus during off-peak hours is The total power is 180 + 140 + 100 + 60 + 0 = 480 million kWh. Considering the pumped storage charging and discharging efficiency, the pumped storage discharge capacity is 408 million kWh (the pumped storage charging and discharging efficiency is assumed to be 85%).

[0109] Accumulated power shortage during peak load periods The result is 0 + 210 + 290 + 10 = 5.1 million kilowatt-hours.

[0110] 3. Scenarios and output coefficient calculation under pumping and storage conditions:

[0111] The above calculation results show that, in terms of power output, the pumped storage capacity of 4.08 million kWh is less than the peak power shortage of 5.1 million kWh; in terms of power balance, the pumped storage capacity of 6 million kW is greater than the maximum power shortage of 2.9 million kW, which satisfies the condition that "charging power cannot meet the power shortage, but output can meet the maximum power shortage", corresponding to scenario three.

[0112] According to the method of this invention, the pumped storage output coefficient during peak hours is calculated, and the pumped storage discharge capacity is 4.08 million kWh, with a peak period of 4 hours. Based on the actual determination of peak load periods and power constraints, the maximum top-load capacity of the pumped storage power station is 2 million kW; the rated output of the pumped storage is 6 million kW, which is greater than 2.9 million kW (maximum power shortage). The capacity is 2 million kilowatts (due to power limitations, the output did not reach the rated value).

[0113] Calculated It is 0.33;

[0114] After calculating the supply and demand balance assessment indicators and using the actual discharge of pumped storage to fill the power gap, the remaining power gap is: The figure is 1.02 million kilowatt-hours; considering the maximum power shortage and the cumulative power consumption during the power outage period after the pumped storage power station is supported. It is 3.76 million kilowatt-hours; calculated as follows The value is 0.27, which is less than 0.5. Therefore, it indicates that there is a power shortage during peak load periods, which is a characteristic of peak load. It is recommended that the power system can solve the short-term load shortage problem by configuring a certain amount of energy storage or temporarily purchasing external power.

[0115] like Figure 2The diagram shows the functional modules of the system of this invention: The system disclosed in this invention, which implements the power grid supply and demand balance analysis method based on large-scale pumped storage power output analysis, includes a data acquisition module, a profit and loss calculation module, a gap calculation module, a scenario analysis module, a balance calculation module, and a balance analysis module; these modules are connected in series. The data acquisition module acquires data information of the target power system and uploads it to the profit and loss calculation module. The profit and loss calculation module calculates the power profit and loss data of the target power system without considering energy storage and pumped storage power output, based on the received and acquired data information and the power balance requirements of the target power system, and uploads this data to the gap calculation module. The system comprises the following modules: a gap calculation module, a scenario analysis module, and a balance calculation module. The former calculates the rechargeable capacity of pumped storage and the power gap without considering pumped storage charging and discharging conditions, based on received and obtained data, and uploads this data to the scenario analysis module. The latter analyzes scenarios involving pumped storage participation in the target power system's supply and demand balance based on received and obtained data, and uploads this data to the balance calculation module. The former calculates the supply and demand balance analysis indicators of the target power system based on received and obtained analysis results, and uploads this data to the balance analysis module. The latter performs a grid supply and demand balance analysis of the target power system based on large-scale pumped storage output analysis, based on received and obtained data.

Claims

1. A power grid supply and demand balance analysis method based on large-scale pumped storage output analysis, comprising the following steps: S1. Obtain data information about the target power system; S2. Based on the data obtained in step S1, and considering the power balance requirements of the target power system, calculate the power surplus and deficit data of the target power system without considering energy storage and pumped storage output. S3. Based on the data obtained in step S2, calculate the rechargeable energy data of the pumped storage and the energy gap data without considering the charging and discharging conditions of the pumped storage. S4. Based on the data obtained in step S3, analyze the scenarios in which pumped storage participates in the supply and demand balance of the target power system; S5. Based on the analysis results obtained in step S4, calculate the supply and demand balance analysis index of the target power system; S6. Based on the data obtained in step S5, complete the power grid supply and demand balance analysis of the target power system based on large-scale pumped storage output analysis.

2. The power grid supply and demand balance analysis method based on large-scale pumped storage output analysis according to claim 1, characterized in that... Step S1, which involves acquiring data information about the target power system, specifically includes the following steps: Acquire data information from the target power system; The data information includes the target power system's system load, thermal power output data, hydropower output data, AC tie-line power data, ultra-high voltage DC power data, new energy output data, electrochemical output data, pumped storage output data, system power supply capacity data, thermal power unit power supply capacity data, and hydropower unit power supply capacity data.

3. The power grid supply and demand balance analysis method based on large-scale pumped storage output analysis according to claim 2, characterized in that... Step S2, based on the data obtained in step S1 and the power balance requirements of the target power system, calculates the power surplus / deficit data of the target power system without considering energy storage and pumped storage output. This specifically includes the following steps: The following formula is used as the power balance expression for the target power system: In the formula The load of the target power system under typical high-load conditions at time t; The thermal power output of the target power system under typical high load conditions at time t; The hydropower output of the target power system under typical high load conditions at time t; The AC tie-line power of the target power system under typical high-load conditions at time t; The ultra-high voltage DC power of the target power system under typical high load conditions at time t; The renewable energy output of the target power system under typical high load conditions at time t; The electrochemical output of the target power system under typical high load conditions at time t; The pumped storage capacity of the target power system under typical high load conditions at time t; The maximum power supply capacity of the target power system under the set typical high load mode is calculated using the following formula: In the formula The maximum power supply capacity of the target power system under typical high load conditions at time t; The maximum power supply capacity of thermal power units in the target power system under typical high load conditions at time t. The maximum hydropower supply capacity of the target power system under typical high-load conditions at time t; The power surplus / deficit data of the target power system at time t are calculated without considering energy storage and pumped storage output. for ;in, This indicates that the target power system has a power surplus at time t. This indicates that the target power system is in a power deficit state at time t.

4. The power grid supply and demand balance analysis method based on large-scale pumped storage output analysis according to claim 3, characterized in that... Step S3, which involves calculating the rechargeable energy data of the pumped storage facility and the energy gap data without considering the charging and discharging conditions of the pumped storage facility based on the data information obtained in step S2, specifically includes the following steps: Electrochemical energy storage is converted into pumped storage capacity based on its corresponding capacity and charge / discharge duration. Based on the data obtained in step S2, when At that time, the pumped chargeable capacity was calculated. for ; Based on the data obtained in step S2, when The following formula is used to calculate the power deficit value during the set peak load period, without considering the charging and discharging of pumped storage. for ; Meanwhile, the charging and discharging power of the pumped storage power station meets the following requirements: In the formula This refers to the rated discharge capacity of the pumped storage power station. The charging and discharging efficiency of a pumped storage power station; This refers to the rated charging capacity of the pumped storage power station.

5. The power grid supply and demand balance analysis method based on large-scale pumped storage output analysis according to claim 4, characterized in that... Step S4 involves analyzing the scenario of pumped storage participating in the supply and demand balance of the target power system based on the data information obtained in step S3. This specifically includes the following steps: The scenarios in which pumped storage participates in the supply and demand balance of the target power system include the following four scenarios: Scenario 1: The pumped-storage hydroelectric power generation during the designated off-peak load period can meet the power shortage of the target power system during the designated peak load period, and the output of the pumped-storage hydroelectric power station can meet the maximum power shortage during the designated peak load period; expressed as: In the formula The maximum power shortage during the designated peak load period; At this time, the theoretical output coefficient of the pumped storage power station Represented as ;in The pumped storage capacity of the target power system; When performing supply and demand balance analysis of the target power system, when the actual output coefficient of the pumped storage power station... satisfy At that time, the target power system can meet the power supply demand; Scenario 2: The pumped-storage hydroelectric power generation during the designated off-peak load period can meet the power shortage of the target power system during the designated peak load period, but the output of the pumped-storage hydroelectric power station cannot meet the maximum power shortage during the designated peak load period; this is expressed as: When performing supply and demand balance analysis of the target power system, the actual output coefficient of the pumped storage power station The calculation formula is ; Scenario 3: The pumped storage power generation during the designated off-peak load period cannot meet the power shortage of the target power system during the designated peak load period, but the output of the pumped storage power station can meet the maximum power shortage during the designated peak load period; this is expressed as: Scenario 4: The pumped-storage power generation capacity during the designated off-peak load period is insufficient to meet the power shortage of the target power system during the designated peak load period, and the output of the pumped-storage power station is insufficient to meet the maximum power shortage during the designated peak load period; this is expressed as: For scenarios 3 and 4: the output coefficient of the pumped storage power station is analyzed using the following formula: In the formula This refers to the maximum peak output of a pumped storage power station during a set peak load period. This represents the maximum output coefficient of a pumped storage power station during a designated peak load period. Therefore, during the designated peak load period, the output of the pumped storage power station... satisfy: At this point, the power balance is satisfied. .

6. The power grid supply and demand balance analysis method based on large-scale pumped storage output analysis according to claim 5, characterized in that... Step S5, which calculates the supply and demand balance analysis index of the target power system based on the analysis results obtained in step S4, specifically includes the following steps: The following formula is used to calculate the remaining power deficit in the power grid after considering the support of pumped storage power stations. : s.t. The following formula is used to calculate the maximum power shortage and the cumulative power consumption for the overall power outage duration after considering the support of pumped storage power stations. : s.t. In the formula This refers to the power outage period during peak load times. The supply and demand balance analysis indicators of the target power system were calculated. for .

7. The power grid supply and demand balance analysis method based on large-scale pumped storage output analysis according to claim 6, characterized in that... Step S6, which involves performing a grid supply and demand balance analysis of the target power system based on large-scale pumped storage capacity analysis using the data obtained in step S5, specifically includes the following steps: Based on the obtained supply and demand balance analysis indicators of the target power system To conduct grid supply and demand balance analysis of the target power system based on large-scale pumped storage output analysis: like If so, it is determined that the target power system has a power shortage greater than the set threshold during the set peak load period; like If so, it is determined that the target power system has a power shortage greater than the set threshold during the set peak load period; The set state threshold.

8. A system for implementing the power grid supply and demand balance analysis method based on large-scale pumped storage output analysis as described in any one of claims 1 to 7, characterized in that... It includes a data acquisition module, a profit and loss calculation module, a gap calculation module, a scenario analysis module, a balance calculation module, and a balance analysis module; the data acquisition module, profit and loss calculation module, gap calculation module, scenario analysis module, balance calculation module, and balance analysis module are connected in series; the data acquisition module is used to acquire data information of the target power system and upload the data information to the profit and loss calculation module; the profit and loss calculation module is used to calculate the power profit and loss data information of the target power system without considering energy storage and pumped storage output based on the received data information and the acquired data information, and based on the power balance requirements of the target power system, and upload the data information to the gap calculation module; The gap calculation module is used to calculate the rechargeable energy data of the pumped storage and the energy gap data without considering the charging and discharging conditions of the pumped storage based on the received data information and the obtained data information, and upload the data information to the scenario analysis module. The scenario analysis module is used to analyze the scenarios in which pumped storage participates in the supply and demand balance of the target power system based on the received data information, and upload the data information to the balance calculation module. The balance calculation module is used to calculate the supply and demand balance analysis indicators of the target power system based on the received data and the analysis results, and then upload the data to the balance analysis module. The balance analysis module is used to perform grid supply and demand balance analysis of the target power system based on the received data and the obtained data.

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