A method, device, electronic device and storage medium for determining the input and output power limits of AC sections in regional power grids

Abstract

The present invention discloses a method, device, electronic device and storage medium for determining the input and output power limits of an AC section of a regional power grid, belonging to the field of power systems. The method comprises: obtaining a simulation model of a regional power grid and a data set of operating modes under different working conditions; and determining the flow direction and total transmission power of the initial simulated AC section based on the operating mode data. In the input direction, if the initial transmission power is less than the input power limit, the load is gradually increased and the unit output is reduced until the input power limit is reached; in the output direction, if the initial transmission power is less than the output power limit, the load is gradually reduced and the unit output is increased until the output power limit is reached. From the target input power and target output power under all operating modes, the minimum value is selected as the input power limit and output power limit of the AC section. By implementing the present invention, the problem of insufficient accuracy in determining the input and output power limits in the prior art can be solved.

Description

Technical Field

[0001] The present invention relates to the technical field of power systems, and in particular to a method, device, electronic equipment and storage medium for determining input and output power limits of an AC section of a regional power grid. Background Art

[0002] With the large-scale integration of renewable energy into the power grid, the uncertainty, randomness, and volatility of renewable energy output present new challenges for calculating regional power balances. To improve the system's renewable energy absorption capacity, ensure a balanced supply and demand of power, and ensure safe and stable operation, regional power balance calculations require comprehensive consideration of multiple boundary conditions. Among these, the AC section's incoming and outgoing power limits directly impact the power exchange capacity between the regional grid and external grids, significantly impacting the accuracy of regional power balance results. This impacts the accuracy of assessments of the system's renewable energy absorption capacity and the rationality of the system's future medium- and long-term planning. Therefore, it is necessary to accurately assess the AC section's incoming and outgoing power limits to provide accurate calculation boundaries for the regional power balance and support the system's renewable energy absorption assessment and future medium- and long-term planning.

[0003] However, existing technologies lack accuracy when determining the input and output power limits for AC sections of regional power grids. Due to the complex and variable operation of regional power grids, load levels, power source combinations, unit startup methods, and operating parameters of the DC transmission channels all significantly affect the transmission power of AC sections. Existing methods typically perform calculations based on a small number of typical operating modes, failing to fully cover the actual operating conditions of the power grid under different operating conditions, thus weakening the accuracy of the calculation results. Summary of the Invention

[0004] The present invention provides a method, device, electronic device and storage medium for determining the input and output power limits of an AC section of a regional power grid, which can solve the problem of insufficient accuracy in determining the input and output power limits in the prior art.

[0005] An embodiment of the present invention provides a method for determining an input and output power limit of an AC section of a regional power grid, comprising:

[0006] Acquire a simulation model of a regional power grid and a data set of operating modes under different operating conditions; wherein the data set of operating modes includes typical load scenarios, unit start-stop combination schemes, and operating parameters of inter-regional DC transmission channels; and the simulation model includes a simulated AC section and a simulated unit;

[0007] When obtaining an operation mode data group of a regional power grid, determining the power flow direction of the initial simulated AC section and the total transmission power of the initial simulated AC section according to the operation mode data group;

[0008] When the power flow direction is the input direction, determine whether the total transmission power of the initial simulated AC section is less than the input power limit. If so, repeatedly increase the load of the simulation model and reduce the output of each simulated unit under the transmission power thermal stability constraint until the total transmission power of the current simulated AC section is not less than the input power limit, and use the total transmission power of the current simulated AC section as the target input power; if not, use the total transmission power of the initial simulated AC section as the target input power;

[0009] When the power flow direction is the sending direction, determine whether the total transmission power of the initial simulated AC section is less than the sending power limit. If so, repeatedly reduce the load of the simulation model and increase the output of each simulated unit under the transmission power thermal stability constraint until the total transmission power of the current simulated AC section is not less than the sending power limit, and use the total transmission power of the current simulated AC section as the target sending power; if not, use the total transmission power of the initial simulated AC section as the target sending power;

[0010] From the target input power and target output power corresponding to each operating mode data group, the minimum target input power is selected as the input power limit of the regional power grid AC section, and the minimum target output power is selected as the output power limit of the regional power grid AC section.

[0011] Furthermore, the transmission power thermal stability constraint includes:

[0012]

[0013]

[0014] in, For the AC section middle channel The transmitted power; For the AC section middle channel Thermal stability limit active power; For the AC section middle channel The transmitted power.

[0015] Furthermore, before selecting the minimum target input power as the input power limit of the AC section of the regional power grid from the target input power and target output power corresponding to each operation mode data group, and selecting the minimum target output power as the output power limit of the AC section of the regional power grid, the method further includes:

[0016] Obtain the maximum load value under the typical load scenario corresponding to each operating mode data group;

[0017] Generate the load reserve demand value corresponding to each operating mode data group according to the maximum load value under the typical load scenario corresponding to each operating mode data group;

[0018] Subtracting the load reserve demand value from each target feed power corresponding to each operation mode data group, and updating the corresponding target feed power according to the calculation result;

[0019] Subtracting the load reserve requirement value from each target output power corresponding to each operation mode data group, and updating the corresponding target output power according to the calculation result;

[0020] The load reserve demand value is generated by the following formula:

[0021]

[0022] Where, is the load reserve demand value; is the maximum load value under the typical load scenario corresponding to the operating mode data group; is the spare factor.

[0023] Furthermore, determining the power flow direction and the total transmission power of the initial simulated AC section based on the operation mode data group includes:

[0024] Performing power flow calculation on the simulation model according to the operation mode data group to generate the transmission power of each channel of the initial simulation AC section;

[0025] According to the transmission power of each channel of the initial simulated AC section, the power flow direction of the initial simulated AC section and the total transmission power of the initial simulated AC section are calculated and generated.

[0026] Furthermore, the simulation model of the regional power grid is obtained by:

[0027] Obtaining the grid topology, power supply operating parameters, and load distribution data of the regional power grid; wherein the grid topology includes the channel connection relationship and voltage level information of the AC section; the power supply operating parameters include the unit type, rated capacity, output range, and operating status; and the load distribution data includes the typical load curve and load category of each node;

[0028] Based on the grid topology, power supply operating parameters and load distribution data, a simulation model of the regional power grid is constructed.

[0029] Based on the above method embodiments, the present invention provides corresponding device embodiments.

[0030] An embodiment of the present invention provides a device for determining the input and output power limits of an AC section of a regional power grid, comprising: a basic data acquisition module, a power flow calculation module, a target input power determination module, a target output power determination module, and an input and output power limit determination module;

[0031] The basic data acquisition module acquires a simulation model of the regional power grid and a set of operating mode data under different operating conditions; wherein the operating mode data set includes typical load scenarios, unit start-stop combination schemes, and operating parameters of inter-regional DC transmission channels; the simulation model includes a simulated AC section and a simulated unit;

[0032] The power flow calculation module is configured to determine the power flow direction and the total transmission power of the initial simulated AC section according to the operation mode data group each time the operation mode data group of a regional power grid is obtained;

[0033] The target input power determination module is used to determine whether the total transmission power of the initial simulated AC section is less than the input power limit when the power flow direction is the input direction. If so, under the transmission power thermal stability constraint, repeatedly increase the load of the simulation model and reduce the output of each simulated unit until the total transmission power of the current simulated AC section is not less than the input power limit, and use the total transmission power of the current simulated AC section as the target input power; if not, use the total transmission power of the initial simulated AC section as the target input power;

[0034] The target transmission limit power determination module is used to determine whether the total transmission power of the initial simulated AC section is less than the transmission power limit when the power flow direction is the transmission direction. If so, under the transmission power thermal stability constraint, repeatedly reduce the load of the simulation model and increase the output of each simulation unit until the total transmission power of the current simulated AC section is not less than the transmission power limit, and use the total transmission power of the current simulated AC section as the target transmission power; if not, use the total transmission power of the initial simulated AC section as the target transmission power;

[0035] The input and output power limit determination module is used to select the minimum target input power as the input power limit of the regional power grid AC section, and select the minimum target output power as the output power limit of the regional power grid AC section from the target input power and target output power corresponding to each operation mode data group.

[0036] Furthermore, the device for determining the input and output power limit of the AC section of the regional power grid further includes: a target input and output power correction module;

[0037] The target input and output power correction module is used to obtain the maximum load value under the typical load scenario corresponding to each operation mode data group;

[0038] Generate the load reserve demand value corresponding to each operating mode data group according to the maximum load value under the typical load scenario corresponding to each operating mode data group;

[0039] Subtracting the load reserve demand value from each target feed power corresponding to each operation mode data group, and updating the corresponding target feed power according to the calculation result;

[0040] Subtracting the load reserve demand value from each target output power corresponding to each operation mode data group, and updating the corresponding target output power according to the calculation result;

[0041] The load reserve demand value is generated by the following formula:

[0042]

[0043] Where, is the load reserve demand value; is the maximum load value under the typical load scenario corresponding to the operating mode data group; is the spare factor.

[0044] Furthermore, the device for determining the input and output power limits of the AC section of the regional power grid, the power flow calculation module, and determining the power flow direction and the total transmission power of the initial simulated AC section based on the operation mode data group include:

[0045] Performing power flow calculation on the simulation model according to the operation mode data group to generate the transmission power of each channel of the initial simulation AC section;

[0046] According to the transmission power of each channel of the initial simulated AC section, the power flow direction of the initial simulated AC section and the total transmission power of the initial simulated AC section are calculated and generated.

[0047] Based on the above method embodiment, the present invention provides a corresponding electronic device embodiment.

[0048] An embodiment of the present invention provides an electronic device, comprising a processor, a memory, and a computer program stored in the memory and configured to be executed by the processor. When the processor executes the computer program, it implements the method for determining the input and output power limit of the AC section of the regional power grid as described in any one of the above-mentioned method embodiments.

[0049] Based on the above method embodiment, the present invention provides a corresponding storage medium embodiment.

[0050] An embodiment of the present invention provides a storage medium having a computer program stored thereon, wherein when the computer program is running, the device where the storage medium is located is controlled to execute the method for determining the input and output power limits of the AC section of the regional power grid as described in any one of the above-mentioned method embodiments.

[0051] Compared with the prior art, the present invention has the following beneficial effects:

[0052] An embodiment of the present invention provides a method, device, electronic device and storage medium for determining the input and output power limits of an AC section of a regional power grid. The method obtains a simulation model of the regional power grid and an operation mode data group under different working conditions, including typical load scenarios, unit start-stop combination schemes and operation parameters of inter-regional DC transmission channels. According to the operation mode data group, the flow direction and total transmission power of the initial simulated AC section are determined. When the flow direction is input, if the initial total transmission power is less than the input power limit, then under the transmission power thermal stability constraint, by gradually increasing the load and reducing the unit output until the total transmission power is not less than the input power limit, the total transmission power at this time is used as the target input power; if the initial total transmission power is greater than or equal to the input power limit, the initial total transmission power is directly used as the target input power. When the power flow is in the outbound direction, if the initial total transmission power is less than the outbound power limit, the load is gradually reduced and the unit output is increased until the total transmission power is equal to or greater than the outbound power limit. The total transmission power at this point is then used as the target outbound power. If the initial total transmission power is already greater than or equal to the outbound power limit, the initial total transmission power is directly used as the target outbound power. The minimum of the target inbound power and target outbound power under all operating conditions is selected as the inbound power limit and outbound power limit, respectively, for the AC section of the regional power grid.

[0053] The present invention comprehensively considers various scenarios of regional power grids under different working conditions, and improves the accuracy of calculation results by evaluating the input and output power limits through dynamic simulation. By gradually adjusting the load and unit output to approach the limit state, this method can more realistically reflect the operating characteristics of the power grid compared to the existing scheme that only calculates thermal stability limits for a few operating modes. In addition, this method always follows the transmission power thermal stability constraints during the evaluation process, ensuring that the system completes the power limit evaluation under the premise of safety and stability, avoiding the problem of over-estimation that may occur during the calculation process, improving the accuracy of the calculation results, helping to improve the regional power grid's new energy absorption capacity, and providing a scientific basis for the system's future medium- and long-term planning. BRIEF DESCRIPTION OF THE DRAWINGS

[0054] Figure 1 The present invention provides a flowchart of a method for determining input and output power limits of an AC section of a regional power grid according to an embodiment of the present invention.

[0055] Figure 2The present invention is a schematic structural diagram of a device for determining input and output power limits of an AC section of a regional power grid provided by one embodiment of the present invention. DETAILED DESCRIPTION

[0056] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. All other embodiments obtained by ordinary technicians in this field based on the embodiments of the present invention without making any creative efforts shall fall within the scope of protection of the present invention.

[0057] like Figure 1 As shown, to solve the problem of insufficient accuracy in determining the input and output power limits in the prior art, an embodiment of the present invention provides a method for determining the input and output power limits of an AC section of a regional power grid, comprising at least the following steps:

[0058] Step S1: Acquire a simulation model of a regional power grid and a data set of operating modes under different operating conditions; wherein the data set of operating modes includes typical load scenarios, unit start-stop combination schemes, and operating parameters of inter-regional DC transmission channels; and the simulation model includes a simulated AC section and a simulated unit.

[0059] Specifically, a simulation model of the regional power grid and a data set of operating modes under different operating conditions are obtained. The data set includes typical load scenarios, unit start / stop combinations, and operating parameters of inter-regional DC transmission channels. These data sets are used to comprehensively characterize the operating characteristics of the regional power grid under different load levels, unit combinations, and transmission channel operating conditions. Typical load scenarios refer to representative load level scenarios based on historical data and load forecasts, such as peak load, medium load, and valley load. Typical load scenarios are used to assess the operating status of the power grid under different load demands. Unit start / stop combinations refer to the start / stop states and output combinations of different types of generators in the power grid under a specific operating mode. These include thermal power units, hydropower units, nuclear power units, wind turbines, and photovoltaic units. Unit start / stop combinations directly impact the power supply capacity and security of the power grid. Inter-regional DC transmission channels are DC transmission lines connecting different regional power grids, used to transmit power between regions. The operating parameters of inter-regional DC transmission channels include power transmission direction and power transfer volume. These play a key role in the integration of new energy and inter-regional power allocation.

[0060] The simulation model includes a simulated AC section and simulated generators. The simulated AC section is a simulated regional AC section, defined as a specific boundary within a regional power grid, consisting of a set of AC transmission lines or substations. It is used to measure and monitor inter-regional power transmission. It is typically used to analyze the power exchange capacity of a regional power grid with other regions and assess the operational safety and stability of the power grid. In a power system, an AC section acts as a "virtual cross-section," demarcating the flow of power within a specific area. When power flows from one region to another, the lines within the section carry the corresponding transmission power. Based on the direction of power flow, this power flow can be divided into incoming power and outgoing power, representing the flow of power into or out of the region, respectively. The simulated AC section simulates the operating status of key transmission channels within the regional power grid, reflecting the transmission capacity of the regional power grid under different power flow distributions. The simulated generators include various types of generators within the region, such as coal-fired, gas-fired, biomass, hydropower, nuclear, wind, photovoltaic, and energy storage units. Their start / stop status and output levels can be adjusted based on the operating mode data set. By constructing the above simulation model and conducting simulation analysis of the regional power grid based on different operating mode data sets, the flow direction and total transmission power of the AC section can be effectively evaluated, thereby providing data support for further determining the input and output power limits of the regional power grid.

[0061] In a preferred embodiment, the simulation model of the regional power grid is obtained by:

[0062] Obtaining the grid topology, power supply operating parameters, and load distribution data of the regional power grid; wherein the grid topology includes the channel connection relationship and voltage level information of the AC section; the power supply operating parameters include the unit type, rated capacity, output range, and operating status; and the load distribution data includes the typical load curve and load category of each node;

[0063] Based on the grid topology, power supply operating parameters and load distribution data, a simulation model of the regional power grid is constructed.

[0064] Specifically, the regional power grid's topology, power source operating parameters, and load distribution data are acquired to comprehensively characterize the grid's physical connectivity, power source operating characteristics, and load demand characteristics. The grid topology includes AC section channel connectivity and voltage level information, describing the connections between substations, transmission lines, and key nodes within the grid and clarifying the path of power flow. Power source operating parameters include unit type, rated capacity, output range, and operating status, encompassing the specific characteristics of various power sources within the regional power grid. Unit types include coal-fired power, gas-fired power, biomass power, hydropower, nuclear power, wind power, photovoltaic power, and energy storage. Operating status includes unit start / stop status, maintenance status, and operating mode, enabling simulation of power generation capacity and regulation characteristics under different scenarios. Load distribution data includes typical load curves and load categories for each node. Load curves reflect load trends over different time periods. Load categories include industrial, commercial, and residential loads, each with different time-varying characteristics and response capabilities. This data provides a foundation for simulating load variations and load-side responses during grid operation. Based on the grid topology, power supply operating parameters, and load distribution data, a simulation model of the regional power grid is constructed. This model accurately simulates the power flow distribution, voltage levels, and power transmission characteristics of the regional power grid under different operating modes, providing a reliable simulation environment for subsequent cross-section power limit calculations, grid dispatch optimization, and stability analysis.

[0065] Step S2: when obtaining an operation mode data set of a regional power grid, determining the power flow direction and the total transmission power of the initial simulated AC section according to the operation mode data set;

[0066] Specifically, each time an operation mode data group of a regional power grid is obtained, the power flow direction of the initial simulated AC section and the total transmission power of the initial simulated AC section are determined according to the operation mode data group.

[0067] First, a simulation model is used to perform power flow calculations based on the load levels, power generation unit start / stop combinations, and inter-regional DC transmission channel operating parameters in the operating mode data set. This power flow calculation iteratively solves for node voltages and line powers in the regional power grid to simulate power flows under the current operating mode.

[0068] In the power flow calculation results, the power flow direction of the simulated AC section is determined by the combined power transmission direction of all AC channels within the section. If the dominant power flow direction within the section is from an external area into the current area, the power flow direction is the incoming direction; if the dominant power flow direction is from the current area to an external area, the power flow direction is the outgoing direction.

[0069] Simultaneously, based on the power flow calculation results, the active power of each AC channel within the section is accumulated to obtain the total transmission power of the initial simulated AC section. This total transmission power is used to subsequently evaluate the input and output power limits of the AC section. This process provides accurate initial values ​​for the transmission capacity of the AC section under different operating modes, facilitating subsequent power limit verification and safety assessments.

[0070] In a preferred embodiment, determining the power flow direction and the total transmission power of the initial simulated AC section based on the operation mode data group includes:

[0071] Performing power flow calculation on the simulation model according to the operation mode data group to generate the transmission power of each channel of the initial simulation AC section;

[0072] According to the transmission power of each channel of the initial simulated AC section, the power flow direction of the initial simulated AC section and the total transmission power of the initial simulated AC section are calculated and generated.

[0073] Specifically, based on the operating mode data set, a power flow calculation is performed on the simulation model to generate the transmission power for each channel of the initial simulated AC section. This power flow calculation is based on the grid's node admittance matrix, power source output, load level, and operating parameters of the DC transmission channels. By iteratively solving the node voltage and power distribution of the regional power grid, the active power and reactive power for each channel in the simulated AC section are obtained.

[0074] After obtaining the transmission power of each channel in the initial simulated AC section, the power flow direction of the initial simulated AC section is comprehensively determined based on the active power transmission direction of each channel. Specifically, if the power flow direction of most channels in the AC section is from the external area to the current area, the power flow direction is determined to be the input direction; if the power flow direction of most channels is from the current area to the external area, the power flow direction is determined to be the output direction.

[0075] Subsequently, the active power of each channel in the initial simulated AC section is accumulated to calculate the total transmission power of the initial simulated AC section. The total transmission power is used to represent the actual power exchange level of the regional power grid under the current operating mode, providing basic data for subsequent power limit verification and operational safety assessment.

[0076] Through the above method, the flow direction and total transmission power of the AC section under different operating modes can be accurately determined, thereby providing a reliable reference basis for the dispatch optimization, operation evaluation and new energy absorption analysis of the regional power grid.

[0077] Step S3: When the power flow direction is the input direction, determine whether the total transmission power of the initial simulated AC section is less than the input power limit. If so, repeatedly increase the load of the simulation model and reduce the output of each simulated unit under the transmission power thermal stability constraint until the total transmission power of the current simulated AC section is not less than the input power limit, and use the total transmission power of the current simulated AC section as the target input power; if not, use the total transmission power of the initial simulated AC section as the target input power.

[0078] Specifically, when the power flow direction is the inbound direction, the system first determines whether the total transmission power of the initially simulated AC section is less than the inbound power limit. The inbound power limit is an upper limit calculated based on the thermal stability constraints of each channel in the AC section and is used to ensure the maximum inbound power under stable grid operation conditions.

[0079] If the total transmission power of the initial simulated AC section is less than the input power limit, it is necessary to further increase the load of the simulation model and reduce the output of each simulated unit to simulate the operation state of the power grid at a higher load level and lower unit output. After each round of adjustment, the power flow calculation is re-performed to update the transmission power of each channel of the simulated AC section and the total transmission power. This process must ensure that the transmission power of all channels meets its thermal stability constraints, that is, the actual transmission power of each channel must not exceed the corresponding thermal stability limit. This adjustment process continues until the total transmission power of the simulated AC section reaches or exceeds the input power limit. At this point, the total transmission power of the current simulated AC section is regarded as the target input power, as the result of evaluating the section's input capacity under this operating mode.

[0080] If the total transmission power of the initially simulated AC section is not less than the feed-in power limit, it indicates that the feed-in power under the current operating mode has approached or reached the limit. In this case, there is no need to further adjust the load and unit output; the total transmission power of the initially simulated AC section can be directly used as the target feed-in power.

[0081] It can be understood that through this method, the input power limit of the AC section can be accurately evaluated under different working conditions, providing a reliable basis for the dispatch optimization and safety assessment of the regional power grid.

[0082] Step S4: When the power flow direction is the outgoing direction, determine whether the total transmission power of the initial simulated AC section is less than the sending power limit. If so, repeatedly reduce the load of the simulation model and increase the output of each simulated unit under the transmission power thermal stability constraint until the total transmission power of the current simulated AC section is no less than the sending power limit, and use the total transmission power of the current simulated AC section as the target sending power; if not, use the total transmission power of the initial simulated AC section as the target sending power;

[0083] Specifically, when the power flow is in the outbound direction, the system first determines whether the total transmission power of the initial simulated AC section is less than the outbound power limit. The outbound power limit is an upper limit calculated based on the thermal stability constraints of each channel in the AC section and is used to ensure the maximum outbound power of the power grid under safe and stable conditions.

[0084] If the total transmission power of the initial simulated AC section is less than the transmission power limit, the operating state of the simulation model needs to be further adjusted. Specifically, by gradually reducing the load level in the simulation model and increasing the output of each simulated unit, the operating state of the power grid under low load and high unit output is simulated. After each round of adjustment, a flow calculation is performed to re-obtain the transmission power and total transmission power of each channel of the simulated AC section. In this process, it is necessary to ensure that the transmission power of all channels always meets the thermal stability constraint, that is, the actual transmission power of each channel must not exceed its corresponding thermal stability limit. If the adjusted total transmission power reaches or exceeds the transmission power limit, the total transmission power of the current simulated AC section is regarded as the target transmission power, which is used to evaluate the transmission capacity of the section under this operating mode.

[0085] If the total transmission power of the initially simulated AC section is not less than the output power limit, it indicates that the output power under the current operating mode has reached or is close to the limit. At this time, there is no need to further adjust the load and unit output; the total transmission power of the initially simulated AC section is directly used as the target output power.

[0086] In this way, the transmission power limit of the AC section can be accurately assessed under different operating modes, ensuring the safe and stable operation of the regional power grid in high-load transmission scenarios, while providing a strong decision-making basis for the operation scheduling and medium- and long-term planning of the power grid. In a preferred embodiment, the transmission power thermal stability constraint includes:

[0087]

[0088]

[0089] in, For the AC section middle channel The transmitted power; For the AC section middle channel Thermal stability limit active power; For the AC section middle channel The transmitted power.

[0090] Step S5: From the target input power and target output power corresponding to each operation mode data group, select the minimum target input power as the input power limit of the regional power grid AC section, and select the minimum target output power as the output power limit of the regional power grid AC section.

[0091] Specifically, after obtaining simulation results for all operating mode data sets, the corresponding target input and output powers are extracted from each operating mode data set. Because different operating modes may correspond to different grid load levels, unit combinations, and operating parameters of the external DC transmission channel, the transmission capacity of the AC section may vary.

[0092] To ensure the safe and stable operation of the regional power grid under various operating conditions, the minimum target power input must be selected from all target power inputs as the power input limit for the AC section of the regional power grid. This limit effectively reflects the maximum power input capacity of the regional power grid under the most unfavorable operating conditions, ensuring sufficient redundancy and safety margin in the system.

[0093] Similarly, the minimum target power output is selected from all target output power levels as the output power limit for the regional power grid's AC section. This minimum ensures the regional power grid can safely transmit power under extreme operating conditions while also avoiding potential safety hazards caused by overestimating output capacity.

[0094] Finally, by selecting the minimum value of the target input power and target output power, the input power limit and output power limit of the regional power grid AC section are reasonably determined, providing reliable boundary conditions for power grid dispatching and operation, and providing a scientific basis for the safe and stable control of the system.

[0095] In a preferred embodiment, before selecting the minimum target input power as the input power limit of the AC section of the regional power grid from the target input power and target output power corresponding to each operation mode data group and selecting the minimum target output power as the output power limit of the AC section of the regional power grid, the method further includes:

[0096] Obtain the maximum load value under the typical load scenario corresponding to each operating mode data group;

[0097] Generate the load reserve demand value corresponding to each operating mode data group according to the maximum load value under the typical load scenario corresponding to each operating mode data group;

[0098] Subtracting the load reserve demand value from each target feed power corresponding to each operation mode data group, and updating the corresponding target feed power according to the calculation result;

[0099] Subtracting the load reserve requirement value from each target output power corresponding to each operation mode data group, and updating the corresponding target output power according to the calculation result;

[0100] Specifically, the maximum load values ​​under typical load scenarios corresponding to each operating mode data group are obtained to characterize the extreme load levels of the regional power grid under different operating modes. Typical load scenarios include high load, medium load, and low load, fully covering the actual operating status of the regional power grid.

[0101] Based on the maximum load value corresponding to each operating mode data group, the load reserve requirement value for each operating mode data group is calculated according to the preset reserve coefficient. The load reserve requirement value is usually set at 2% to 5% of the maximum load value to cope with load forecast errors and unexpected events, ensuring that the system has sufficient regulation capacity and operating margin in emergency situations.

[0102] Subsequently, adjustments are made to the target feed-in power corresponding to each operating mode data set. Specifically, the corresponding load reserve requirement value is subtracted from each target feed-in power to reflect the actual impact of load reserve demand on the AC section's feed-in capacity. This updated target feed-in power more accurately represents the regional grid's feed-in capacity while still meeting reserve requirements.

[0103] Similarly, adjustments are made to the target delivery power corresponding to each operating mode data set. The corresponding load reserve requirement value is subtracted from each target delivery power to obtain the updated target delivery power. This adjustment ensures that the load reserve requirement is fully considered in the calculation of the delivery power limit, thereby providing a more conservative and secure delivery power limit.

[0104] Through the above operations, the accuracy and reliability of the input power and output power limits are further improved, providing a scientific basis for the dispatching decisions of the regional power grid in actual operation, while enhancing the safety and stability of the power grid under sudden load changes.

[0105] The load reserve demand value is generated by the following formula:

[0106]

[0107] Where, is the load reserve demand value; is the maximum load value under the typical load scenario corresponding to the operating mode data group; is the spare factor.

[0108] Based on the above method embodiments, the present invention provides corresponding device embodiments.

[0109] like Figure 2As shown, an embodiment of the present invention provides a device for determining the input and output power limits of an AC section of a regional power grid, comprising: a basic data acquisition module, a power flow calculation module, a target input power determination module, a target output power determination module, and an input and output power limit determination module;

[0110] The basic data acquisition module acquires a simulation model of the regional power grid and a set of operating mode data under different operating conditions; wherein the operating mode data set includes typical load scenarios, unit start-stop combination schemes, and operating parameters of inter-regional DC transmission channels; the simulation model includes a simulated AC section and a simulated unit;

[0111] The power flow calculation module is configured to determine the power flow direction and the total transmission power of the initial simulated AC section according to the operation mode data group each time the operation mode data group of a regional power grid is obtained;

[0112] The target input power determination module is used to determine whether the total transmission power of the initial simulated AC section is less than the input power limit when the power flow direction is the input direction. If so, under the transmission power thermal stability constraint, repeatedly increase the load of the simulation model and reduce the output of each simulated unit until the total transmission power of the current simulated AC section is not less than the input power limit, and use the total transmission power of the current simulated AC section as the target input power; if not, use the total transmission power of the initial simulated AC section as the target input power;

[0113] The target transmission limit power determination module is used to determine whether the total transmission power of the initial simulated AC section is less than the transmission power limit when the power flow direction is the transmission direction. If so, under the transmission power thermal stability constraint, repeatedly reduce the load of the simulation model and increase the output of each simulation unit until the total transmission power of the current simulated AC section is not less than the transmission power limit, and use the total transmission power of the current simulated AC section as the target transmission power; if not, use the total transmission power of the initial simulated AC section as the target transmission power;

[0114] The input and output power limit determination module is used to select the minimum target input power as the input power limit of the regional power grid AC section, and select the minimum target output power as the output power limit of the regional power grid AC section from the target input power and target output power corresponding to each operation mode data group.

[0115] In a preferred embodiment, the device for determining the input and output power limit of the regional power grid AC section further includes: a target input and output power correction module;

[0116] The target input and output power correction module is used to obtain the maximum load value under the typical load scenario corresponding to each operation mode data group;

[0117] Generate the load reserve demand value corresponding to each operating mode data group according to the maximum load value under the typical load scenario corresponding to each operating mode data group;

[0118] Subtracting the load reserve demand value from each target feed power corresponding to each operation mode data group, and updating the corresponding target feed power according to the calculation result;

[0119] Subtracting the load reserve demand value from each target output power corresponding to each operation mode data group, and updating the corresponding target output power according to the calculation result;

[0120] The load reserve demand value is generated by the following formula:

[0121]

[0122] Where, is the load reserve demand value; is the maximum load value under the typical load scenario corresponding to the operating mode data group; is the spare factor.

[0123] In a preferred embodiment, the device for determining the input and output power limits of the regional power grid AC section, the power flow calculation module, and determining the power flow direction and the total transmission power of the initial simulated AC section based on the operation mode data group include:

[0124] Performing power flow calculation on the simulation model according to the operation mode data group to generate the transmission power of each channel of the initial simulation AC section;

[0125] According to the transmission power of each channel of the initial simulated AC section, the power flow direction of the initial simulated AC section and the total transmission power of the initial simulated AC section are calculated and generated.

[0126] It should be noted that the embodiment of the device described above corresponds to the above-mentioned embodiment of the present invention, and it can implement the method for determining the input and output power limits of the AC section of the regional power grid described in any one of the above-mentioned embodiments of the present invention. In addition, the embodiment of the above-mentioned device is merely illustrative, wherein the modules described as separate components may or may not be physically separated, and the components displayed as modules may or may not be physical units, that is, they may be located in one place, or they may be distributed on multiple network units. Some or all of the modules can be selected according to actual needs to achieve the purpose of the scheme of this embodiment. In addition, in the drawings of the embodiment of the device provided by the present invention, the connection relationship between the modules indicates that there is a communication connection between them, which can be specifically implemented as one or more communication buses or signal lines. A person of ordinary skill in the art can understand and implement it without paying any creative work.

[0127] Based on the above method embodiment of the present invention, a corresponding electronic device embodiment is provided.

[0128] An embodiment of the present invention provides an electronic device, comprising a processor, a memory, and a computer program stored in the memory and configured to be executed by the processor. When the processor executes the computer program, the method for determining the input and output power limits of the AC section of a regional power grid as described in any one of the present inventions is implemented, or when the processor executes the computer program, the functions of the modules in the above-mentioned device embodiments are implemented.

[0129] Exemplarily, the computer program may be divided into one or more modules, which are stored in the memory and executed by the processor to implement the present invention. The one or more modules may be a series of computer program instruction segments capable of performing specific functions, and the instruction segments are used to describe the execution process of the computer program in the terminal device.

[0130] The terminal device may be a computing device such as a desktop computer, a notebook computer, a PDA, a cloud server, etc. The terminal device may include, but is not limited to, a processor and a memory.

[0131] The processor may be a central processing unit (CPU), other general-purpose processors, digital signal processors (DSP), application-specific integrated circuits (ASIC), field-programmable gate arrays (FPGA) or other programmable logic devices, discrete gate or transistor logic devices, discrete hardware components, etc. A general-purpose processor may be a microprocessor or any conventional processor. The processor is the control center of the terminal device and connects various parts of the entire terminal device using various interfaces and lines.

[0132] The memory can be used to store the computer programs and / or modules. The processor implements the various functions of the terminal device by running or executing the computer programs and / or modules stored in the memory and accessing the data stored in the memory. The memory may mainly include a program storage area and a data storage area. The program storage area may store an operating system, at least one application required for a function, etc.; the data storage area may store data created based on the use of the mobile phone, etc. In addition, the memory may include high-speed random access memory and non-volatile memory, such as a hard disk, internal memory, a plug-in hard disk, a smart media card (SMC), a secure digital (SD) card, a flash card, at least one disk storage device, a flash memory device, or other volatile solid-state storage device.

[0133] Based on the above method embodiment, the present invention provides a corresponding storage medium embodiment;

[0134] Another embodiment of the present invention provides a storage medium, which includes a stored computer program. When the computer program is running, the device where the storage medium is located is controlled to execute the method for determining the input and output power limits of the AC section of any regional power grid described above according to the present invention.

[0135] The aforementioned storage medium is a computer-readable storage medium, and the computer program includes computer program code, which may be in source code form, object code form, an executable file, or some intermediate form. The computer-readable medium may include any entity or device capable of carrying the computer program code, a recording medium, a USB flash drive, a removable hard drive, a magnetic disk, an optical disk, a computer memory, a read-only memory (ROM), a random access memory (RAM), an electric carrier signal, a telecommunications signal, and a software distribution medium. It should be noted that the content of the computer-readable medium may be appropriately increased or decreased based on the requirements of legislation and patent practice within a jurisdiction. For example, in some jurisdictions, based on legislation and patent practice, computer-readable media do not include electric carrier signals and telecommunications signals.

[0136] In the description of this specification, the reference terms "one embodiment," "some embodiments," "example," "specific example," or "some examples" mean that the specific features, structures, materials, or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present application. Moreover, the specific features, structures, materials, or characteristics described may be combined in any appropriate manner in any one or more embodiments or examples. In addition, those skilled in the art may combine and integrate different embodiments or examples described in this specification, as well as features of different embodiments or examples, unless they are mutually inconsistent.

[0137] The above is a preferred embodiment of the present invention. It should be pointed out that for ordinary technicians in this technical field, several improvements and modifications can be made without departing from the principles of the present invention. These improvements and modifications are also considered to be within the scope of protection of the present invention.

Claims

1. A method for determining the input and output power limits of an AC section of a regional power grid, characterized in that: include: Obtaining the grid topology, power supply operating parameters, and load distribution data of the regional power grid; wherein the grid topology includes the channel connection relationship and voltage level information of the AC section; the power supply operating parameters include the unit type, rated capacity, output range, and operating status; and the load distribution data includes the typical load curve and load category of each node; Based on the grid topology, power supply operating parameters, and load distribution data, a simulation model of the regional power grid is constructed; wherein the simulation model includes a simulated AC section and a simulated unit; Acquiring a data set of operating modes of a regional power grid under different operating conditions; wherein the data set of operating modes includes typical load scenarios, unit start-stop combination schemes, and operating parameters of inter-regional direct current transmission channels; When obtaining an operation mode data group of a regional power grid, performing power flow calculation on the simulation model according to the operation mode data group to generate the transmission power of each channel of the initial simulation AC section; According to the transmission power of each channel of the initial simulated AC section, the flow direction of the initial simulated AC section and the total transmission power of the initial simulated AC section are calculated and generated; When the power flow direction is the input direction, determine whether the total transmission power of the initial simulated AC section is less than the input power limit. If so, repeatedly increase the load of the simulation model and reduce the output of each simulated unit under the transmission power thermal stability constraint until the total transmission power of the current simulated AC section is not less than the input power limit, and use the total transmission power of the current simulated AC section as the target input power; if not, use the total transmission power of the initial simulated AC section as the target input power; When the power flow direction is the sending direction, determine whether the total transmission power of the initial simulated AC section is less than the sending power limit. If so, repeatedly reduce the load of the simulation model and increase the output of each simulated unit under the transmission power thermal stability constraint until the total transmission power of the current simulated AC section is not less than the sending power limit, and use the total transmission power of the current simulated AC section as the target sending power; if not, use the total transmission power of the initial simulated AC section as the target sending power; Obtain the maximum load value under the typical load scenario corresponding to each operating mode data group; Generate the load reserve demand value corresponding to each operating mode data group according to the maximum load value under the typical load scenario corresponding to each operating mode data group; Subtracting the load reserve demand value from each target feed power corresponding to each operation mode data group, and updating the corresponding target feed power according to the calculation result; Subtracting the load reserve requirement value from each target output power corresponding to each operation mode data group, and updating the corresponding target output power according to the calculation result; From the target input power and target output power corresponding to each operating mode data group, the minimum target input power is selected as the input power limit of the regional power grid AC section, and the minimum target output power is selected as the output power limit of the regional power grid AC section.

2. The method for determining the input and output power limits of the AC section of the regional power grid according to claim 1, characterized in that: The transmission power thermal stability constraint includes: in, For the AC section middle channel The transmitted power; For the AC section middle channel Thermal stability limit active power; For the AC section middle channel The transmitted power.

3. The method for determining the input and output power limits of the AC section of the regional power grid according to claim 2, characterized in that: The load reserve demand value is generated by the following formula: Where, is the load reserve demand value; is the maximum load value under the typical load scenario corresponding to the operating mode data group; is the spare factor.

4. A device for determining the input and output power limits of an AC section of a regional power grid, characterized in that: include: Basic data acquisition module, power flow calculation module, target input power determination module, target output power determination module, target input and output power correction module and input and output power limit determination module; The basic data acquisition module is used to obtain the grid topology, power supply operating parameters, and load distribution data of the regional power grid; wherein the grid topology includes the channel connection relationship and voltage level information of the AC section; the power supply operating parameters include the unit type, rated capacity, output range, and operating status; the load distribution data includes the typical load curve and load category of each node; based on the grid topology, power supply operating parameters, and load distribution data, a simulation model of the regional power grid is constructed; wherein the simulation model includes a simulated AC section and a simulated unit; and an operating mode data group of the regional power grid under different operating conditions is obtained; wherein the operating mode data group includes typical load scenarios, unit start-stop combination schemes, and operating parameters of inter-regional DC transmission channels; The power flow calculation module is configured to perform power flow calculation on the simulation model based on the operating mode data group each time a regional power grid operating mode data group is obtained, thereby generating the transmission power of each channel of the initial simulated AC section; and calculate and generate the power flow direction of the initial simulated AC section and the total transmission power of the initial simulated AC section based on the transmission power of each channel of the initial simulated AC section; The target input power determination module is used to determine whether the total transmission power of the initial simulated AC section is less than the input power limit when the power flow direction is the input direction. If so, under the transmission power thermal stability constraint, repeatedly increase the load of the simulation model and reduce the output of each simulated unit until the total transmission power of the current simulated AC section is not less than the input power limit, and use the total transmission power of the current simulated AC section as the target input power; if not, use the total transmission power of the initial simulated AC section as the target input power; The target output power determination module is configured to determine whether the total transmission power of the initial simulated AC section is less than the output power limit when the power flow direction is the output direction; if so, repeatedly reduce the load of the simulation model and increase the output of each simulated unit under the transmission power thermal stability constraint until the total transmission power of the current simulated AC section is not less than the output power limit, and use the total transmission power of the current simulated AC section as the target output power; if not, use the total transmission power of the initial simulated AC section as the target output power; The target input and output power correction module is configured to obtain the maximum load value under the typical load scenario corresponding to each operating mode data group; generate the load standby demand value corresponding to each operating mode data group based on the maximum load value under the typical load scenario corresponding to each operating mode data group; perform an operation of subtracting the load standby demand value from each target input power corresponding to each operating mode data group, and update the corresponding target input power based on the calculation result; perform an operation of subtracting the load standby demand value from each target output power corresponding to each operating mode data group, and update the corresponding target output power based on the calculation result; The input and output power limit determination module is used to select the minimum target input power as the input power limit of the regional power grid AC section, and select the minimum target output power as the output power limit of the regional power grid AC section from the target input power and target output power corresponding to each operation mode data group.

5. The device for determining the input and output power limits of the AC section of a regional power grid according to claim 4, characterized in that: The load reserve demand value is generated by the following formula: Where, is the load reserve demand value; is the maximum load value under the typical load scenario corresponding to the operating mode data group; is the spare factor.

6. An electronic device, characterized in that: The method comprises a processor, a memory, and a computer program stored in the memory and configured to be executed by the processor, wherein when the processor executes the computer program, the method for determining the power limit of the AC section of the regional power grid according to any one of claims 1 to 3 is implemented.

7. A storage medium, characterized in that: The storage medium includes a stored computer program, wherein when the computer program is running, the device where the storage medium is located is controlled to execute the method for determining the input and output power limit of the AC section of the regional power grid as described in any one of claims 1 to 3.

Images