Regional power grid AC section sending-in and sending-out power limit value determination method and device, electronic equipment and storage medium

Abstract

The invention discloses a method and a device for determining a sending-in and sending-out power limit value of an alternating-current section of a regional power grid, electronic equipment and a storage medium, and belongs to the field of power systems, and the method comprises the following steps: obtaining a simulation model of the regional power grid and an operation mode data set under different working conditions; and determining the power flow direction and the total transmission power of the initial simulation AC section according to the operation mode data. If the initial transmission power is smaller than the input power limit in the input direction, gradually increasing the load, and reducing the output of the unit until the input power limit is reached; if the initial transmission power is smaller than the output power limit in the output direction, gradually reducing the load, and increasing the output of the unit until the output power limit is reached. And respectively selecting minimum values from the target sending power and the target sending power in all the operation modes as a sending power limit value and a sending power limit value of the AC section. By implementing the invention, the problem of insufficient determination accuracy of the sending-in and sending-out power limit value in the prior art can be solved.

Description

Technical Field

[0001] The present invention relates to the technical field of power systems, and particularly to a method, device, electronic device, and storage medium for determining the power limit of the incoming and outgoing power of an AC section of a regional power grid. Background Art

[0002] With the large-scale access of new energy to the power grid, due to the uncertainty, randomness, and volatility of new energy output, etc., the power and electricity balance calculation of the regional power grid faces new challenges. In order to improve the new energy consumption capacity of the system, ensure the power and electricity supply-demand balance of the system, and take into account the safe and stable operation of the system, the power and electricity balance calculation of the regional power grid needs to comprehensively consider various boundary conditions. Among them, the power limits of the incoming and outgoing power of the AC section directly affect the power exchange capacity between the regional power grid and the external power grid, have a greater impact on the accuracy of the power and electricity balance result of the regional power grid, and affect the accuracy of the evaluation of the new energy consumption level of the system and the rationality of the future medium- and long-term planning of the system. Therefore, it is necessary to accurately evaluate the power limits of the incoming and outgoing power of the AC section to provide accurate calculation boundaries for the power and electricity balance of the regional power grid and support the new energy consumption evaluation and future medium- and long-term planning of the system.

[0003] However, the existing technology has the problem of insufficient accuracy when determining the power limits of the incoming and outgoing power of the AC section of the regional power grid. Due to the complex and changeable operation modes of the regional power grid, the load level, power source combination, unit startup mode, and operation parameters of the external DC transmission channel will all have a significant impact on the transmission power of the AC section. The existing methods usually calculate based on a small number of typical operation modes and fail to fully cover the actual operation states of the power grid under different working conditions, 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 power limits of the incoming and outgoing power of an AC section of a regional power grid, which can solve the problem of insufficient accuracy in determining the power limits of the incoming and outgoing power in the existing technology.

[0005] An embodiment of the present invention provides a method for determining the power limits of the incoming and outgoing power of an AC section of a regional power grid, including: Obtaining a simulation model of the regional power grid and a set of operation mode data under different working conditions; wherein, the set of operation mode data includes typical load scenarios, unit start-stop combination schemes, and operation parameters of the cross-regional DC transmission channel; the simulation model includes a simulated AC section and simulated units; When obtaining each set of operation mode data of the 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 set of operation mode data; When the tidal current direction is the incoming direction, it is judged whether the total transmission power of the initial simulation AC section is less than the incoming power limit. If so, under the thermal stability constraint of the transmission power, the load of the simulation model is repeatedly increased and the output of each simulation unit is reduced until the total transmission power of the current simulation AC section is not less than the incoming power limit, and the total transmission power of the current simulation AC section is used as the target incoming power; if not, the total transmission power of the initial simulation AC section is used as the target incoming power; When the tidal current direction is the outgoing direction, it is judged whether the total transmission power of the initial simulation AC section is less than the outgoing power limit. If so, under the thermal stability constraint of the transmission power, the load of the simulation model is repeatedly reduced and the output of each simulation unit is increased until the total transmission power of the current simulation AC section is not less than the outgoing power limit, and the total transmission power of the current simulation AC section is used as the target outgoing power; if not, the total transmission power of the initial simulation AC section is used as the target outgoing power; From the target incoming power and the target outgoing power corresponding to each operation mode data group, the minimum target incoming power is selected as the incoming power limit of the regional power grid AC section, and the minimum target outgoing power is selected as the outgoing power limit of the regional power grid AC section.

[0006] Further, the thermal stability constraint of the transmission power includes: Among them, is the transmission power fed into the channel in the AC section; is the thermal stability limit active power of the channel in the AC section; is the transmission power sent out from the channel in the AC section.

[0007] Further, before selecting the minimum target incoming power as the incoming power limit of the regional power grid AC section and the minimum target outgoing power as the outgoing power limit of the regional power grid AC section from the target incoming power and the target outgoing power corresponding to each operation mode data group, it also includes: Obtain the maximum load value under the typical load scenario corresponding to each operation mode data group; Generate the load reserve demand value corresponding to each operation mode data group according to the maximum load value under the typical load scenario corresponding to each operation mode data group; Perform the operation of subtracting the load reserve demand value from each target incoming power in the target incoming power corresponding to each operation mode data group, and update the corresponding target incoming power according to the calculation result; For each target transmission power corresponding to the operating mode data set, perform an operation of subtracting the load reserve demand value, and update the corresponding target transmission power according to the calculation result; Among them, the load reserve demand value is generated by the following formula: In the formula, is the load reserve demand value; is the maximum load value under the typical load scenario corresponding to the operating mode data set; is the reserve coefficient.

[0008] Further, determining the power flow direction of the initial simulation AC section and the total transmission power of the initial simulation AC section according to the operating mode data set includes: Perform a power flow calculation on the simulation model according to the operating mode data set to generate the transmission power of each channel of the initial simulation AC section; Calculate and generate the power flow direction of the initial simulation AC section and the total transmission power of the initial simulation AC section according to the transmission power of each channel of the initial simulation AC section.

[0009] Further, the simulation model of the regional power grid is obtained through the following method: Obtain the power grid topology structure, power source operation parameters, and load distribution data of the regional power grid; among them, the power grid topology structure includes the channel connection relationship and voltage level information of the AC section; the power source operation 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 power grid topology structure, power source operation parameters, and load distribution data, construct a simulation model of the regional power grid.

[0010] On the basis of the above method item embodiments, the present invention correspondingly provides device item embodiments.

[0011] An embodiment of the present invention provides a device for determining the limit value of the incoming and outgoing power of the AC section of the regional power grid, including: a basic data acquisition module, a power flow calculation module, a target incoming power determination module, a target outgoing power determination module, and an incoming and outgoing power limit value determination module; The basic data acquisition module obtains the simulation model of the regional power grid and the operating mode data set under different working conditions; among them, the operating mode data set includes typical load scenarios, unit start-stop combination schemes, and operating parameters of cross-regional DC transmission channels; the simulation model includes a simulation AC section and simulation units; The power flow calculation module is used to determine the power flow direction of the initial simulation AC section and the total transmission power of the initial simulation AC section according to the operation mode data set each time an operation mode data set of a regional power grid is obtained; The target input power determination module is used to, when the power flow direction is the input direction, determine whether the total transmission power of the initial simulation AC section is less than the input power limit. If so, under the thermal stability constraint of the transmission power, repeatedly increase the load of the simulation model and reduce the output of each simulation unit until the total transmission power of the current simulation AC section is not less than the input power limit, and take the total transmission power of the current simulation AC section as the target input power; if not, take the total transmission power of the initial simulation AC section as the target input power; The target output limit power determination module is used to, when the power flow direction is the output direction, determine whether the total transmission power of the initial simulation AC section is less than the output power limit. If so, under the thermal stability constraint of the transmission power, repeatedly reduce the load of the simulation model and increase the output of each simulation unit until the total transmission power of the current simulation AC section is not less than the output power limit, and take the total transmission power of the current simulation AC section as the target output power; if not, take the total transmission power of the initial simulation AC section as the target output power; The input and output power limit determination module is used to select the minimum target input power from the target input powers corresponding to each operation mode data set 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.

[0012] Further, the device for determining the input and output power limits of the regional power grid AC section further includes: a target input and output power correction module; 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 set; Generate the load reserve demand value corresponding to each operation mode data set according to the maximum load value under the typical load scenario corresponding to each operation mode data set; Perform the operation of subtracting the load reserve demand value from each target input power among the target input powers corresponding to each operation mode data set, and update the corresponding target input power according to the calculation result; Perform the operation of subtracting the load reserve demand value from each target output power among the target output powers corresponding to each operation mode data set, and update the corresponding target output power according to the calculation result; Among them, the load reserve demand value is generated by the following formula: In the formula, is the load reserve demand value; is the maximum load value under the typical load scenario corresponding to the operation mode data set; is the reserve coefficient.

[0013] Further, for the device for determining the transmission power limit 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 simulation AC section according to the operation mode data set, it includes: Perform a power flow calculation on the simulation model according to the operation mode data set to generate the transmission power of each channel of the initial simulation AC section; Calculate and generate the power flow direction and the total transmission power of the initial simulation AC section according to the transmission power of each channel of the initial simulation AC section.

[0014] Based on the above method item embodiments, the present invention correspondingly provides an electronic device item embodiment.

[0015] An embodiment of the present invention provides an electronic device, including 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 transmission power limit of the AC section of the regional power grid described in any one of the above method item embodiments.

[0016] Based on the above method item embodiments, the present invention correspondingly provides a storage medium item embodiment.

[0017] An embodiment of the present invention provides a storage medium, on which a computer program is stored. When the computer program runs, it controls the device where the storage medium is located to execute the method for determining the transmission power limit of the AC section of the regional power grid described in any one of the above method item embodiments.

[0018] Compared with the prior art, the present invention has the following beneficial effects: 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 operation mode data sets 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 sets, the power flow direction and total transmission power of the initial simulation AC section are determined. When the power flow direction is incoming, if the initial total transmission power is less than the incoming power limit, under the thermal stability constraint of the transmission power, by gradually increasing the load and reducing the unit output until the total transmission power is not less than the incoming power limit, the total transmission power at this time is used as the target incoming power; if the initial total transmission power is already greater than or equal to the incoming power limit, the initial total transmission power is directly used as the target incoming power. When the power flow direction is outgoing, if the initial total transmission power is less than the outgoing power limit, by gradually reducing the load and increasing the unit output until the total transmission power is not less than the outgoing power limit, the total transmission power at this time is used as the target outgoing power; if the initial total transmission power is already greater than or equal to the outgoing power limit, the initial total transmission power is directly used as the target outgoing power. The minimum values are respectively selected from the target incoming power and target outgoing power under all working conditions as the incoming power limit and outgoing power limit of the AC section of the regional power grid.

[0019] The present invention comprehensively considers various scenarios of the regional power grid under different working conditions, and evaluates the incoming and outgoing power limits through dynamic simulation, improving the accuracy of the calculation results. By gradually adjusting the load and unit output to approach the limit state, compared with the existing solutions that only calculate the thermal stability limit for a few operation modes, this method can more realistically reflect the operation characteristics of the power grid. In addition, this method always follows the thermal stability constraint of the transmission power during the evaluation process, ensuring that the power limit evaluation is completed on the premise of system safety and stability, avoiding the problem of overestimation that may occur during the calculation process, improving the accuracy of the calculation results, helping to improve the new energy consumption capacity of the regional power grid, and providing a scientific basis for the medium- and long-term planning of the system in the future. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 It is a flowchart showing a method for determining the input and output power limits of an AC section of a regional power grid provided by an embodiment of the present invention.

[0021] Figure 2 It is a structural diagram showing a device for determining the input and output power limits of an AC section of a regional power grid provided by an embodiment of the present invention. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0022] The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without creative efforts shall fall within the protection scope of the present invention.

[0023] As Figure 1 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, which at least includes the following steps: Step S1: Obtain the simulation model of the regional power grid and the operation mode data sets under different working conditions; wherein, the operation mode data sets include typical load scenarios, unit start-stop combination schemes, and operation parameters of inter-regional DC transmission channels; the simulation model includes a simulated AC section and simulated units. Specifically, obtain the simulation model of the regional power grid and the operation mode data sets under different working conditions; wherein, the operation mode data sets include typical load scenarios, unit start-stop combination schemes, and operation parameters of inter-regional DC transmission channels, which are used to comprehensively characterize the operation characteristics of the regional power grid under different load levels, unit combinations, and external transmission channel operation states. The typical load scenario refers to a representative load level scenario formed based on historical data and load forecasting, such as peak load, medium load, low load, etc. The typical load scenario is used to evaluate the operation status of the power grid under different load demands. The unit start-stop combination scheme refers to the start-stop state and output combination of different types of generating units in a certain operation mode of the power grid. It includes thermal power units, hydropower units, nuclear power units, wind power units, photovoltaic units, etc. The unit start-stop combination directly affects the power supply capacity and safety of the power grid. The inter-regional DC transmission channel refers to the DC transmission line connecting different regional power grids, which is used to transmit power between regions. The operation parameters of the inter-regional DC transmission channel include the power transmission direction, power transmission volume, etc. They play a key role in new energy consumption and inter-regional power allocation.

[0024] The simulation model includes a simulated AC section and simulated generating units. The simulated AC section is a simulated regional AC section, which refers to a specific boundary composed of a group of AC transmission lines or substations in the regional power grid and is used to measure and monitor the power transmission between regions. It is usually used to analyze the power exchange capacity between the regional power grid and other regions and to evaluate the operation safety and stability of the power grid. In the power system, the AC section is equivalent to a "virtual cross-section" that divides the power flow in a specific region. When power flows from one region to another, the lines on the section will carry the corresponding transmission power. According to the power flow direction, it can be divided into incoming power and outgoing power, which respectively represent the situation of power flowing into or out of the region. The simulated AC section is used to simulate the operation status of the key transmission channels in the regional power grid and reflect the transmission capacity of the regional power grid under different power flow distributions; the simulated generating units include various types of generating units in the region, such as coal-fired power, gas-fired power, biomass power generation, hydropower, nuclear power, wind power, photovoltaic power, energy storage and other units, and their start-stop status and output levels can be adjusted according to the operation mode data set. By constructing the above simulation model and performing simulation analysis on the regional power grid based on different operation mode data sets, the power flow direction and total transmission power of the AC section can be effectively evaluated, thereby providing data support for further determining the incoming and outgoing power limits of the regional power grid.

[0025] In a preferred embodiment, the simulation model of the regional power grid is obtained in the following manner: Obtain the power grid topology structure, power source operation parameters, and load distribution data of the regional power grid; among them, the power grid topology structure includes the channel connection relationship and voltage level information of the AC section; the power source operation parameters include the unit type, rated capacity, output range, and operation status; the load distribution data includes the typical load curves and load categories of each node; Based on the power grid topology structure, power source operation parameters, and load distribution data, construct the simulation model of the regional power grid.

[0026] Specifically, obtain the grid topology structure, power source operation parameters, and load distribution data of the regional grid to comprehensively characterize the physical connection relationship, power source operation characteristics, and load demand characteristics of the grid. Among them, the grid topology structure includes the channel connection relationship and voltage level information of the AC section, which is used to describe the connection methods of various substations, transmission lines, and key nodes in the grid and clarify the path of power flow. The power source operation parameters include unit type, rated capacity, output range, and operation status, covering the specific characteristics of various power sources in the regional grid. The unit types include coal power, gas power, biomass power generation, hydropower, nuclear power, wind power, photovoltaic, and energy storage, etc. The operation status includes the start-stop status, maintenance status, and operation mode of the unit, which are used to simulate the power generation capacity and regulation characteristics under different scenarios. The load distribution data includes the typical load curves and load categories of each node. The load curve reflects the load change trend at different time periods, and the load categories include industrial load, commercial load, residential load, etc. Different types of loads have different time-varying characteristics and response capabilities. These data provide a basis for simulating the load change and load-side response in the grid operation. Based on the grid topology structure, power source operation parameters, and load distribution data, construct a simulation model of the regional grid. This simulation model can accurately simulate the power flow distribution, voltage level, and power transmission characteristics of the regional grid under different operation modes, providing a reliable simulation environment for subsequent section power limit calculation, grid dispatching optimization, and stability analysis.

[0027] Step S2: When obtaining each set of operation mode data of a regional grid, determine the power flow direction and total transmission power of the initial simulation AC section according to the set of operation mode data. Specifically, when obtaining each set of operation mode data of a regional grid, determine the power flow direction and total transmission power of the initial simulation AC section according to the set of operation mode data.

[0028] First, based on the load level, start-stop combination plan of power source units, and operation parameters of the cross-regional DC transmission channel in the set of operation mode data, use the simulation model to perform power flow calculation. The power flow calculation iteratively solves the node voltages and line powers of the regional grid to simulate the power flow situation under the current operation mode.

[0029] In the power flow calculation results, the power flow direction of the simulation AC section is comprehensively judged by the power transmission directions of all AC channels in the section. If the dominant power flow direction in the section is from the external region into the current region, the power flow direction is the incoming direction; if the dominant power flow direction is from the current region to the external region, the power flow direction is the outgoing direction.

[0030] Meanwhile, according to the power flow calculation results, the active power of each AC channel in the section is accumulated to obtain the total transmission power of the initial simulation AC section. This total transmission power is used to evaluate the incoming or outgoing power limits of the AC section subsequently. Through this process, accurate initial values can be provided for the transmission capacity of the AC section under different operating modes, which helps the subsequent power limit verification and security assessment.

[0031] In a preferred embodiment, determining the power flow direction of the initial simulation AC section and the total transmission power of the initial simulation AC section according to the operating mode data set includes: Performing a power flow calculation on the simulation model according to the operating mode data set to generate the transmission power of each channel of the initial simulation AC section; Calculating and generating the power flow direction of the initial simulation AC section and the total transmission power of the initial simulation AC section according to the transmission power of each channel of the initial simulation AC section.

[0032] Specifically, performing a power flow calculation on the simulation model according to the operating mode data set to generate the transmission power of each channel of the initial simulation AC section. The power flow calculation is based on the nodal admittance matrix of the power grid, the power output of power sources, the load level, and the operating parameters of DC transmission channels. By iteratively solving the nodal voltage and power distribution of the regional power grid, the active power and reactive power of each channel in the simulation AC section are obtained.

[0033] After obtaining the transmission power of each channel of the initial simulation AC section, the power flow direction of the initial simulation AC section is comprehensively judged 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 into the current area, the power flow direction is determined as the incoming direction; if the power flow direction of most channels is from the current area to the external area, the power flow direction is determined as the outgoing direction.

[0034] Subsequently, the active power of each channel of the initial simulation AC section is accumulated to calculate and generate the total transmission power of the initial simulation AC section. The total transmission power is used to characterize the actual power exchange level of the regional power grid under the current operating mode and provides basic data for the subsequent power limit verification and operation security assessment.

[0035] Through the above method, the power flow direction and total transmission power of the AC section under different operating modes can be accurately determined, thus providing a reliable reference basis for the dispatching optimization, operation assessment, and new energy consumption analysis of the regional power grid.

[0036] Step S3: When the power flow direction is the incoming direction, determine whether the total transmission power of the initial simulation AC section is less than the incoming power limit. If so, under the thermal stability constraint of the transmission power, repeatedly increase the load of the simulation model and decrease the output of each simulation unit until the total transmission power of the current simulation AC section is not less than the incoming power limit, and take the total transmission power of the current simulation AC section as the target incoming power; if not, take the total transmission power of the initial simulation AC section as the target incoming power; Specifically, when the power flow direction is the incoming direction, first determine whether the total transmission power of the initial simulation AC section is less than the incoming power limit. The incoming power limit is the upper limit value calculated based on the thermal stability constraints of each channel in the AC section, and is used to ensure the maximum incoming power of the power grid under stable operating conditions.

[0037] If the total transmission power of the initial simulation AC section is less than the incoming power limit, it is necessary to further increase the load of the simulation model and decrease the output of each simulation unit to simulate the operation state of the power grid under a higher load level and lower unit output. After each round of adjustment, perform a power flow calculation again to update the transmission power of each channel in the simulation AC section and the total transmission power. This process needs to ensure that the transmission power of all channels meets their thermal stability constraints, that is, the actual transmission power of each channel shall not exceed the corresponding thermal stability limit. This adjustment process continues until the total transmission power of the simulation AC section reaches or exceeds the incoming power limit. At this time, the total transmission power of the current simulation AC section is regarded as the target incoming power and used as the result of evaluating the incoming capacity of the section under this operating mode.

[0038] If the total transmission power of the initial simulation AC section is not less than the incoming power limit, it means that the incoming power under the current operating mode has approached or reached the limit value. In this case, there is no need to further adjust the load and unit output, and directly take the total transmission power of the initial simulation AC section as the target incoming power.

[0039] It can be understood that through this method, the incoming power limit of the AC section can be accurately evaluated under different working conditions, providing a reliable basis for the dispatching optimization and safety assessment of the regional power grid.

[0040] Step S4: When the power flow direction is the outgoing direction, determine whether the total transmission power of the initial simulation AC section is less than the outgoing power limit. If so, under the thermal stability constraint of the transmission power, repeatedly decrease the load of the simulation model and increase the output of each simulation unit until the total transmission power of the current simulation AC section is not less than the outgoing power limit, and take the total transmission power of the current simulation AC section as the target outgoing power; if not, take the total transmission power of the initial simulation AC section as the target outgoing power; Specifically, when the tidal current direction is the sending direction, first determine whether the total transmission power of the initial simulation AC section is less than the sending power limit. The sending power limit is the upper limit value calculated based on the thermal stability constraints of each channel in the AC section, and is used to ensure the maximum sending power of the power grid under safe and stable conditions.

[0041] If the total transmission power of the initial simulation AC section is less than the sending power limit, it is necessary to further adjust the operating state of the simulation model. Specifically, by gradually reducing the load level in the simulation model and increasing the output of each simulation unit at the same time, simulate the operating state of the power grid under low load and high unit output. After each round of adjustment, perform a power flow calculation to re-obtain the transmission power and total transmission power of each channel in the simulation AC section. During this process, it is necessary to ensure that the transmission power of all channels always meets the thermal stability constraints, that is, the actual transmission power of each channel shall not exceed its corresponding thermal stability limit. If the adjusted total transmission power reaches or exceeds the sending power limit, the total transmission power of the current simulation AC section is regarded as the target sending power, which is used to evaluate the sending capacity of the section under this operating mode.

[0042] If the total transmission power of the initial simulation AC section is not less than the sending power limit, it indicates that the sending power under the current operating mode has reached or approached the limit value. At this time, there is no need to further adjust the load and unit output, and directly use the total transmission power of the initial simulation AC section as the target sending power.

[0043] In this way, the sending power limit of the AC section can be accurately evaluated under different operating modes, ensuring the safe and stable operation of the regional power grid in the high-load power transmission scenario, and at the same time providing a strong decision-making basis for the operation dispatching and medium- and long-term planning of the power grid. In a preferred embodiment, the thermal stability constraint of the transmission power includes: Among them, is the transmission power fed into channel in the AC section; is the active power of the thermal stability limit of channel in the AC section; is the transmission power sent out by channel in the AC section.

[0044] Step S5: From the target input power and target output power corresponding to each operating mode data group, select the minimum target input power as the input power limit value of the regional power grid AC section, and select the minimum target output power as the output power limit value of the regional power grid AC section.

[0045] Specifically, after obtaining the simulation results of all operation mode data groups, the corresponding target incoming power and target outgoing power are extracted from each operation mode data group. Since different operation modes may correspond to different grid load levels, unit combinations, and operation parameters of the external DC transmission channels, there are differences in the transmission capacity of the AC section.

[0046] To ensure the safe and stable operation of the regional power grid under various working conditions, it is necessary to select the minimum target incoming power among all the target incoming powers as the incoming power limit value of the AC section of the regional power grid. This limit value can effectively reflect the maximum incoming capacity of the regional power grid under the most unfavorable working conditions and ensure that the system has sufficient redundancy and safety margin.

[0047] Similarly, select the minimum target outgoing power among all the target outgoing powers as the outgoing power limit value of the AC section of the regional power grid. By choosing the minimum value, it is ensured that the regional power grid can still safely send out electricity under extreme working conditions, while avoiding potential safety hazards caused by overestimating the outgoing capacity.

[0048] Finally, by selecting the minimum values of the target incoming power and the target outgoing power, the incoming power limit value and the outgoing power limit value of the AC section of the regional power grid are reasonably determined, providing reliable boundary conditions for the grid dispatching operation and scientific basis for the safe and stable control of the system.

[0049] [[ID=]12]In a preferred embodiment, before selecting the minimum target incoming power as the incoming power limit value of the AC section of the regional power grid and selecting the minimum target outgoing power as the outgoing power limit value of the AC section of the regional power grid from the target incoming power and the target outgoing power corresponding to each operation mode data group, it further includes: Obtain the maximum load value under the typical load scenario corresponding to each operation mode data group; Generate the load reserve demand value corresponding to each operation mode data group according to the maximum load value under the typical load scenario corresponding to each operation mode data group; Perform the operation of subtracting the load reserve demand value from each target incoming power in the target incoming power corresponding to each operation mode data group, and update the corresponding target incoming power according to the calculation result; Perform the operation of subtracting the load reserve demand value from each target outgoing power in the target outgoing power corresponding to each operation mode data group, and update the corresponding target outgoing power according to the calculation result; Specifically, obtaining the maximum load value under the typical load scenario corresponding to each operation mode data group is used to characterize the extreme load level of the regional power grid under different operation modes. The typical load scenario includes various working conditions such as high load, medium load, and low load, which can comprehensively cover the actual operation state of the regional power grid.

[0050] Based on the maximum load values corresponding to each operating mode data set, the load reserve demand values for each operating mode data set are calculated and generated according to a preset reserve coefficient. The load reserve demand value is usually set to 2% to 5% of the maximum load value, which is used to cope with load prediction errors and emergencies, ensuring that the system has sufficient adjustment capabilities and operating margins in emergency situations.

[0051] Subsequently, adjustment operations are performed on the target incoming power corresponding to each operating mode data set. Specifically, each target incoming power is subtracted by the corresponding load reserve demand value to reflect the actual impact of the load reserve demand on the incoming capacity of the AC section. The target incoming power updated in this way can more accurately characterize the incoming capacity of the regional power grid under the premise of meeting the reserve demand.

[0052] Similarly, similar adjustments are performed on the target outgoing power corresponding to each operating mode data set. Each target outgoing power is subtracted by the corresponding load reserve demand value to obtain the updated target outgoing power. This adjustment ensures that the load reserve demand is fully considered in the calculation of the outgoing power limit, thereby providing a more conservative and safe outgoing power limit value.

[0053] Through the above operations, the accuracy and reliability of the incoming power and outgoing power limit values are further improved, providing a scientific basis for the dispatching decision-making of the regional power grid in actual operation, and at the same time enhancing the safety and stability of the power grid under sudden load changes.

[0054] Among them, the load reserve demand value is generated through the following formula: In the formula, is the load reserve demand value; is the maximum load value in the typical load scenario corresponding to the operating mode data set; is the reserve coefficient.

[0055] Based on the above method item embodiments, the present invention correspondingly provides device item embodiments.

[0056] As Figure 2 shown, an embodiment of the present invention provides a device for determining the incoming and outgoing power limit values of an AC section of a regional power grid, including: a basic data acquisition module, a power flow calculation module, a target incoming power determination module, a target outgoing power determination module, and an incoming and outgoing power limit value determination module; The basic data acquisition module acquires the simulation model of the regional power grid and the operating mode data sets under different working conditions; wherein, the operating mode data sets include typical load scenarios, unit start-stop combination schemes, and operating parameters of cross-regional DC transmission channels; the simulation model includes a simulated AC section and simulated units; The power flow calculation module is used to determine the power flow direction of the initial simulation AC section and the total transmission power of the initial simulation AC section according to the operation mode data group each time an operation mode data group of a regional power grid is obtained. The target input power determination module is used to, when the power flow direction is the input direction, determine whether the total transmission power of the initial simulation AC section is less than the input power limit. If so, under the thermal stability constraint of the transmission power, repeatedly increase the load of the simulation model and reduce the output of each simulation unit until the total transmission power of the current simulation AC section is not less than the input power limit, and use the total transmission power of the current simulation AC section as the target input power; if not, use the total transmission power of the initial simulation AC section as the target input power. The target output limit power determination module is used to, when the power flow direction is the output direction, determine whether the total transmission power of the initial simulation AC section is less than the output power limit. If so, under the thermal stability constraint of the transmission power, repeatedly reduce the load of the simulation model and increase the output of each simulation unit until the total transmission power of the current simulation AC section is not less than the output power limit, and use the total transmission power of the current simulation AC section as the target output power; if not, use the total transmission power of the initial simulation AC section as the target output power. The input and output power limit determination module is used to select the minimum target input power from the target input powers corresponding to each operation mode data group as the input power limit of the AC section of the regional power grid, and select the minimum target output power as the output power limit of the AC section of the regional power grid.

[0057] In a preferred embodiment, the device for determining the input and output power limits of the AC section of the regional power grid further includes: a target input and output power correction module; 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. Generate the load reserve demand value corresponding to each operation mode data group according to the maximum load value under the typical load scenario corresponding to each operation mode data group. Perform the operation of subtracting the load reserve demand value from each target input power among the target input powers corresponding to each operation mode data group, and update the corresponding target input power according to the calculation result. Perform the operation of subtracting the load reserve demand value from each target output power among the target output powers corresponding to each operation mode data group, and update the corresponding target output power according to the calculation result. Among them, the load reserve demand value is generated by the following formula: In the formula, is the load reserve demand value; is the maximum load value under the typical load scenario corresponding to the operation mode data set; is the reserve coefficient.

[0058] In a preferred embodiment, for the device for determining the power limit of the AC section of the regional power grid, the power flow calculation module, which determines the power flow direction and the total transmission power of the initial simulation AC section according to the operation mode data set, includes: Perform a power flow calculation on the simulation model according to the operation mode data set to generate the transmission power of each channel of the initial simulation AC section; Calculate and generate the power flow direction and the total transmission power of the initial simulation AC section according to the transmission power of each channel of the initial simulation AC section.

[0059] It should be noted that the device embodiments described above correspond to the above embodiments of the present invention, and can implement the method for determining the power limit of the incoming and outgoing power of the AC section of the regional power grid described in any one of the above of the present invention. In addition, the device embodiments above are only illustrative, where the modules described as separate components may or may not be physically separated, and the components shown as modules may or may not be physical units, that is, they may be located in one place or distributed to multiple network units. Some or all of the modules can be selected according to actual needs to achieve the purpose of the solution of this embodiment. In addition, in the attached drawings of the device embodiments provided by the present invention, the connection relationship between the modules indicates that they have a communication connection, which can be specifically implemented as one or more communication buses or signal lines. Those of ordinary skill in the art can understand and implement without creative work.

[0060] Based on the above method embodiment of the present invention, a corresponding electronic device embodiment is provided.

[0061] An embodiment of the present invention provides an electronic device, including 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 power limit of the incoming and outgoing power of the AC section of the regional power grid described in any one of the present invention, or when the processor executes the computer program, it implements the functions of each module in the above device embodiments.

[0062] 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 these instruction segments are used to describe the execution process of the computer program in the terminal device.

[0063] The terminal device may be a computing device such as a desktop computer, a notebook, a palm computer, and a cloud server. The terminal device may include, but is not limited to, a processor and a memory.

[0064] The so-called processor may be a central processing unit (CPU), or may also be other general-purpose processors, digital signal processors (DSPs), application specific integrated circuits (ASICs), field-programmable gate arrays (FPGAs), or other programmable logic devices, discrete gate or transistor logic devices, discrete hardware components, etc. The general-purpose processor may be a microprocessor or the processor may also be any conventional processor, etc. The processor is the control center of the terminal device, and connects various parts of the entire terminal device through various interfaces and circuits.

[0065] The memory may be used to store the computer program and / or modules. The processor realizes various functions of the terminal device by running or executing the computer program and / or modules stored in the memory, and by calling the data stored in the memory. The memory may mainly include a program storage area and a data storage area. Among them, the program storage area may store an operating system, application programs required for at least one function, etc.; the data storage area may store data created according to the use of the mobile phone, etc. In addition, the memory may include high-speed random access memory, and may also include non-volatile memory, such as a hard disk, a memory, a plug-in hard disk, a smart media card (SMC), a secure digital (SD) card, a flash card, at least one magnetic disk storage device, a flash memory device, or other volatile solid-state storage devices.

[0066] Based on the above method item embodiments, the present invention correspondingly provides storage medium item embodiments; Another embodiment of the present invention provides a storage medium, which includes a stored computer program. When the computer program runs, it controls the device where the storage medium is located to execute the method for determining the power limit for the incoming and outgoing power of any of the above-mentioned regional power grid AC sections of the present invention.

[0067] Among them, the above storage medium is a computer-readable storage medium. The computer program includes computer program code, and the computer program code can be in the form of source code, object code, executable file, or some intermediate form, etc. The computer-readable medium can include: any entity or device capable of carrying the computer program code, recording medium, USB flash drive, mobile hard disk, magnetic disk, optical disk, computer memory, read-only memory (ROM, Read-Only Memory), random access memory (RAM, Random Access Memory), electrical carrier signal, telecommunication signal, and software distribution medium, etc. It should be noted that the content included in the computer-readable medium can be appropriately increased or decreased according to the requirements of legislation and patent practice in the jurisdiction. For example, in some jurisdictions, according to legislation and patent practice, the computer-readable medium does not include electrical carrier signals and telecommunication signals.

[0068] In the description of this specification, the description referring to terms such as "one embodiment", "some embodiments", "example", "specific example", or "some examples" means that the specific features, structures, materials, or characteristics described in connection 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 can be combined in a suitable manner in any one or more embodiments or examples. In addition, without contradiction, those skilled in the art can combine and combine the different embodiments or examples described in this specification and the features of different embodiments or examples.

[0069] The above is the preferred embodiment of the present invention. It should be noted that for those of ordinary skill in the art in this technical field, without departing from the principle of the present invention, several improvements and refinements can still be made, and these improvements and refinements are also regarded as the protection scope of the present invention.

Claims

1. A method for determining the power transmission and reception limits of AC sections in a regional power grid, characterized in that, Including: Obtain the simulation model of the regional power grid and the operation mode data sets under different working conditions; wherein, the operation mode data sets include typical load scenarios, unit start-stop combination schemes, and operation parameters of inter-regional DC transmission channels; the simulation model includes a simulated AC section and simulated units; When obtaining each operation mode data set of the regional power grid, determine 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 set; When the power flow direction is the incoming direction, determine whether the total transmission power of the initial simulated AC section is less than the incoming power limit. If so, under the thermal stability constraint of the transmission power, 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 incoming power limit, and use the total transmission power of the current simulated AC section as the target incoming power; if not, use the total transmission power of the initial simulated AC section as the target incoming power; 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 outgoing power limit. If so, under the thermal stability constraint of the transmission power, repeatedly reduce the load of the simulation model and increase the output of each simulated unit until the total transmission power of the current simulated AC section is not less than the outgoing power limit, and use the total transmission power of the current simulated AC section as the target outgoing power; if not, use the total transmission power of the initial simulated AC section as the target outgoing power; Select the minimum target incoming power from the target incoming powers and target outgoing powers corresponding to each operation mode data set as the incoming power limit of the regional power grid AC section, and select the minimum target outgoing power as the outgoing power limit of the regional power grid AC section.

2. The method for determining the input and output power limit of the AC section of the regional power grid according to claim 1, wherein The thermal stability constraint of the transmission power includes: Among them, is the transmission power fed into the channel in the AC section ; is the thermal stability limit active power of the channel in the AC section ; is the transmission power sent out by the channel in the AC section .

3. The method for determining the power transfer limit of the AC section of the regional power grid according to claim 2, characterized in that, Before selecting the minimum target incoming power from the target incoming powers and target outgoing powers corresponding to each operation mode data set as the incoming power limit of the regional power grid AC section and selecting the minimum target outgoing power as the outgoing power limit of the regional power grid AC section, it further includes: Obtain the maximum load value under the typical load scenario corresponding to each operation mode data set; Generate the load reserve demand value corresponding to each operation mode data set according to the maximum load value under the typical load scenario corresponding to each operation mode data set; Perform the operation of subtracting the load reserve demand value from each target incoming power in the target incoming powers corresponding to each operation mode data set, and update the corresponding target incoming power according to the calculation result; Perform the operation of subtracting the load reserve demand value from each target outgoing power in the target outgoing powers corresponding to each operation mode data set, and update the corresponding target outgoing power according to the calculation result; Wherein, the load reserve demand value is generated by the following formula: In the formula, is the value of the load reserve demand; is the maximum load value under the typical load scenario corresponding to the operation mode data group; is the reserve coefficient.

4. The method for determining the power transfer limit of the AC section of the regional power grid according to claim 3, characterized in that The 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 set includes: Perform a power flow calculation on the simulation model according to the operation mode data set to generate the transmission power of each channel of the initial simulated AC section; According to the transmission power of each channel in the initial simulation AC section, calculate and generate the power flow direction of the initial simulation AC section and the total transmission power of the initial simulation AC section.

5. The method for determining the power transfer limit of the AC section of the regional power grid according to claim 4, wherein Obtain the simulation model of the regional power grid in the following ways: Obtain the power grid topology structure, power source operation parameters, and load distribution data of the regional power grid; among them, the power grid topology structure includes the channel connection relationship and voltage level information of the AC section; the power source operation parameters include unit type, rated capacity, output range, and operation status; the load distribution data includes the typical load curve and load category of each node; Based on the power grid topology structure, power source operation parameters, and load distribution data, construct the simulation model of the regional power grid.

6. A device for determining the power transfer limit of an AC section in a regional power grid, characterized in that, Including: Basic data acquisition module, power flow calculation module, target input power determination module, target output power determination module, and input / output power limit determination module; The basic data acquisition module obtains the simulation model of the regional power grid and the operation mode data sets under different working conditions; among them, the operation mode data sets include typical load scenarios, unit start-stop combination schemes, and operation parameters of cross-regional DC transmission channels; the simulation model includes a simulation AC section and simulation units; The power flow calculation module is used to determine the power flow direction of the initial simulation AC section and the total transmission power of the initial simulation AC section according to the operation mode data set each time an operation mode data set of the regional power grid is obtained; The target input power determination module is used to judge whether the total transmission power of the initial simulation AC section is less than the input power limit when the power flow direction is the input direction; if so, under the thermal stability constraint of the transmission power, repeatedly increase the load of the simulation model and reduce the output of each simulation unit until the total transmission power of the current simulation AC section is not less than the input power limit, and use the total transmission power of the current simulation AC section as the target input power; if not, use the total transmission power of the initial simulation AC section as the target input power; The target output limit power determination module is used to judge whether the total transmission power of the initial simulation AC section is less than the output power limit when the power flow direction is the output direction; if so, under the thermal stability constraint of the transmission power, repeatedly reduce the load of the simulation model and increase the output of each simulation unit until the total transmission power of the current simulation AC section is not less than the output power limit, and use the total transmission power of the current simulation AC section as the target output power; if not, use the total transmission power of the initial simulation AC section as the target output power; The input / output power limit determination module is used to select the minimum target input power from the target input powers and target output powers corresponding to each operation mode data set as the input power limit of the AC section of the regional power grid, and select the minimum target output power as the output power limit of the AC section of the regional power grid.

7. The determining device for the power transmission and reception limit of the AC section of the regional power grid according to claim 6, wherein, It also includes: Target input / output power correction module; The target input / output power correction module is used to obtain the maximum load value under the typical load scenario corresponding to each operation mode data set; Generate the load reserve demand values corresponding to each operation mode data group according to the maximum load values under the typical load scenarios corresponding to each operation mode data group; Perform an operation of subtracting the load reserve demand value from each target input power in the target input powers corresponding to each operation mode data group, and update the corresponding target input power according to the calculation result; Perform an operation of subtracting the load reserve demand value from each target output power in the target output powers corresponding to each operation mode data group, and update the corresponding target output power according to the calculation result; Among them, the load reserve demand value is generated through the following formula: In the formula, is the value of the load reserve demand; is the maximum load value under the typical load scenario corresponding to the operation mode data set; is the reserve coefficient.

8. The determining device for the input and output power limit of the AC section of the regional power grid according to claim 7, characterized in that, The power flow calculation module, which determines the power flow direction of the initial simulation AC section and the total transmission power of the initial simulation AC section according to the operation mode data group, includes: Perform a power flow calculation on the simulation model according to the operation mode data group to generate the transmission powers of each channel of the initial simulation AC section; Calculate and generate the power flow direction of the initial simulation AC section and the total transmission power of the initial simulation AC section according to the transmission powers of each channel of the initial simulation AC section.

9. An electronic device, characterized in that, It includes 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 limits of the regional power grid AC section according to any one of claims 1 to 5.

10. A storage medium, characterized in that, The storage medium includes a stored computer program, wherein when the computer program runs, it controls the device where the storage medium is located to execute the method for determining the input and output power limits of the regional power grid AC section according to any one of claims 1 to 5.

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