Methods, devices, equipment and media for coordinated operation control of power transmission and distribution

Abstract

This invention provides a method, apparatus, equipment, and medium for coordinated operation control of power transmission and distribution. The method includes: scanning the safety boundary of the transmission side based on the power grid operation status data on the transmission side to obtain the threshold power range; mapping the carrying capacity of the distribution side based on the threshold power range and the voltage constraints of the internal nodes on the distribution side to obtain the closable power range; performing overlap matching based on the closable power range and the threshold power range to obtain the target power range; performing demand analysis on the transmission side based on the target power range and the bus voltage deviation on the transmission side to obtain the desired threshold power; performing feasibility analysis on the distribution side based on the desired threshold power and the target power range to obtain the target threshold power; and eliminating voltage deviation based on the target threshold power and the operating status of the compensation equipment within the distribution side to obtain the coordinated voltage regulation result. This invention ensures the voltage control safety and coordinated stability of the power transmission and distribution network during dynamic interaction.

Description

Technical Field

[0001] This invention relates to the field of power system automation control technology, and in particular to a method, device, equipment and medium for coordinated operation control of power transmission and distribution. Background Technology

[0002] In existing voltage coordination control systems for power transmission and distribution networks, centralized global optimization or simple hierarchical command transmission mechanisms are typically employed. One typical existing method is that the upper-level transmission dispatch center directly issues fixed output commands or voltage setpoints to the lower-level distribution network based on the power flow calculation results of the entire network. The lower-level distribution network then executes these commands to maintain local voltage stability.

[0003] However, due to significant differences in time scale, control response speed, and network topology complexity between the transmission and distribution sides, higher-level dispatch centers struggle to detect in real-time the risk of rapid voltage exceedances caused by distributed generation fluctuations or load surges within the lower-level distribution network. When higher-level centers forcibly specify fixed voltage targets, they often overlook the actual operational margin of the distribution network. If the distribution network is under heavy load or voltage sensitivity, executing higher-level commands may further deteriorate the voltage at distribution network nodes; conversely, if the distribution network possesses strong support capabilities but these are not recognized by higher-level centers, resources are wasted. More critically, this unidirectional command issuance lacks confirmation of safety constraints on power flow at the interaction boundary (i.e., the threshold), leading to conflicting adjustment actions on both the transmission and distribution sides under extreme conditions, causing oscillations or malfunctioning protection systems. Therefore, the voltage control safety and coordinated stability of the transmission and distribution network during dynamic interaction cannot be guaranteed. Summary of the Invention

[0004] This invention provides a method, apparatus, equipment, and medium for coordinated operation control of power transmission and distribution, aiming to ensure the voltage control safety and coordinated stability of the power transmission and distribution network during dynamic interaction.

[0005] In a first aspect, the present invention provides a power transmission and distribution coordinated operation control method, comprising: Based on the power grid operation status data on the transmission side, a safety boundary scan is performed on the transmission side to obtain the power range at which the transmission side is allowed to inject into the distribution side. Based on the power range at which the transmission side and the voltage constraints of the internal nodes on the distribution side, the carrying capacity of the distribution side is mapped to obtain the range of power that can be shut down. Based on the overlap matching of the shut-in power range and the shut-in power interval, the target power interval for power transmission and distribution is obtained. Based on the target power interval and the bus voltage deviation of the transmission side, the demand analysis of the transmission side is performed to obtain the expected shut-in power sent from the transmission side to the distribution side. Based on the expected threshold power and the target power range, a feasibility analysis is performed on the distribution side to obtain the target threshold power actually executed on the distribution side. Voltage deviations are eliminated based on the target gate power and the operating status of the compensation equipment inside the distribution side, resulting in coordinated voltage regulation that restores the voltage of each node on the distribution side to within the acceptable range.

[0006] In a second aspect, the present invention provides a power transmission and distribution coordinated operation control device for implementing the power transmission and distribution coordinated operation control method as described in the first aspect; the power transmission and distribution coordinated operation control device includes: The load-bearing mapping module is used to perform a safety boundary scan of the transmission side based on the power grid operation status data of the transmission side, to obtain the power range that the transmission side is allowed to inject into the distribution side, and to perform load-bearing capacity mapping of the distribution side based on the power range and the voltage constraints of the internal nodes of the distribution side, so as to obtain the power range that can be shut down. The power contract module is used to perform overlapping matching based on the shut-in power range and the shut-in power interval to obtain the target power interval for power transmission and distribution, and to perform demand analysis on the transmission side based on the target power interval and the bus voltage deviation on the transmission side to obtain the expected shut-in power sent from the transmission side to the distribution side. The feasibility analysis module is used to perform a feasibility analysis on the distribution side based on the expected threshold power and the target power range, so as to obtain the target threshold power actually executed on the distribution side. The coordinated voltage regulation module is used to eliminate voltage deviation based on the target gate power and the operating status of the compensation equipment inside the distribution side, so as to obtain the coordinated voltage regulation result that restores the voltage of each node on the distribution side to the qualified range.

[0007] Thirdly, the present invention provides an electronic device, comprising: a memory for storing a computer program; and a processor for reading and executing the computer program, thereby realizing the power transmission and distribution coordinated operation control method as described above.

[0008] Fourthly, the present invention provides a non-transitory computer-readable storage medium storing a computer program, which, when executed by a processor, implements the above-mentioned power transmission and distribution coordinated operation control method.

[0009] Fifthly, the present invention also provides a computer program product, including a computer program that, when executed by a processor, implements the power transmission and distribution coordinated operation control method as described above.

[0010] The transmission and distribution coordinated operation control method provided in this invention obtains the allowable power range at the transmission side threshold by scanning the safety boundary on the transmission side, and then completes the distribution network carrying capacity mapping by combining the internal node voltage constraints on the distribution side to output a power range that can be switched off to adapt to the actual operating conditions of the distribution network. This method breaks through the shortcomings of traditional methods that only issue fixed commands based on the overall network power flow, cannot perceive the dynamic operating status caused by distributed power fluctuations and load changes in the distribution network, and ignore the actual operating margin of the distribution network. It avoids the voltage deterioration problem caused by executing rigid commands under heavy load and voltage-sensitive conditions of the distribution network, and fully explores the redundancy support capacity of the distribution network and eliminates the waste of grid resources. By matching the overlapping power ranges on both sides, the target power range that is compatible with both transmission and distribution is locked. Combined with the voltage deviation of the transmission side bus, the demand analysis is completed to generate a reasonable expected threshold power, realizing the bidirectional adaptation between the control demand of the transmission side and the carrying capacity of the distribution network, and eliminating the non-interactive defects of traditional unidirectional control. By performing feasibility analysis on the distribution side, the expected threshold power is verified and corrected to obtain the target threshold power that the distribution network can stably execute, thus avoiding the problem of insufficient adaptability of control commands from both the upper and lower levels at the execution level. By accurately eliminating voltage deviations based on the operational status of distribution network compensation equipment, the voltage at each node of the distribution network is stabilized within the acceptable range. Therefore, this embodiment of the invention, through a collaborative process of hierarchical verification, bidirectional matching, and closed-loop correction, fills the gap in the interactive confirmation mechanism for power flow safety constraints at the control points, which is missing in traditional control modes. This effectively avoids the risks of grid oscillations and protection maloperation caused by conflicting control actions on both sides of the transmission and distribution network under extreme operating conditions, ensuring the voltage control safety and collaborative stability of the transmission and distribution network during dynamic interaction. Attached Figure Description

[0011] Figure 1 This is a flowchart illustrating the power transmission and distribution coordinated operation control method provided in an embodiment of the present invention; Figure 2 This is a schematic diagram of the structure of the power transmission and distribution coordinated operation control device provided in an embodiment of the present invention; Figure 3 An embodiment diagram of the electronic device provided in this invention; Figure 4 An embodiment diagram of a computer-readable storage medium provided in accordance with the present invention. Detailed Implementation

[0012] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0013] In the description of this invention, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of the stated features. In the description of this invention, "a plurality of" means two or more, unless otherwise explicitly specified.

[0014] In the description of this invention, the term "for example" is used to mean "used as an example, illustration, or description." Any embodiment described as "for example" in this invention is not necessarily to be construed as being more preferred or advantageous than other embodiments. The following description is provided to enable any person skilled in the art to make and use the invention. Details are set forth in the following description for purposes of explanation. It should be understood that those skilled in the art will recognize that the invention can be made without using these specific details. In other instances, well-known structures and processes will not be described in detail to avoid obscuring the description of the invention with unnecessary detail. Therefore, the invention is not intended to be limited to the embodiments shown, but is consistent with the broadest scope of the principles and features disclosed herein.

[0015] Optionally, see Figure 1 , Figure 1 This is a flowchart illustrating the power transmission and distribution coordinated operation control method provided by the present invention. In this embodiment, the executing entity of the power transmission and distribution coordinated operation control method is an operation control device. Therefore, the power transmission and distribution coordinated operation control method includes: Step 10: Based on the power grid operation status data of the transmission side, perform a safety boundary scan of the transmission side to obtain the power range that the transmission side is allowed to inject into the distribution side. Based on the power range and the voltage constraints of the internal nodes of the distribution side, perform a capacity mapping of the distribution side to obtain the range of power that can be shut down.

[0016] Optionally, the operation control device acquires the power grid operation status data on the transmission side. The power grid operation status data includes the current voltage amplitude of each bus on the transmission side, the current active power flow value of each line on the transmission side, the current reactive power flow value of each line on the transmission side, the current active power output value of each generator unit on the transmission side, the current reactive power output value of each generator unit on the transmission side, and the thermal stability limit power value of each line on the transmission side.

[0017] The operation control device performs a safety boundary scan on the transmission side based on the power grid operation status data on the transmission side, and obtains the threshold power range that the transmission side is allowed to inject into the distribution side.

[0018] The safety constraints on the transmission side include: voltage amplitude constraints for each bus on the transmission side, power flow constraints for each line on the transmission side, and output constraints for each generator unit on the transmission side. The voltage amplitude constraint for each bus on the transmission side requires that the voltage amplitude of each bus on the transmission side be maintained between the preset lower and upper limits. The power flow constraint for each line on the transmission side requires that the combined value of the active and reactive power flow of each line on the transmission side must not exceed the corresponding line's thermal stability limit power value. The output constraint for each generator unit on the transmission side requires that the active power output of each generator unit on the transmission side be maintained between the corresponding lower and upper limits, and the reactive power output of each generator unit on the transmission side must also be maintained between the corresponding lower and upper limits.

[0019] The operation control device takes the current power injection at the gate as the starting point and gradually increases the power injection at the gate with a preset power step value as the step size. After each increase, based on the power grid operation status data on the transmission side and the current power injection at the gate, it calculates the voltage amplitude of each bus on the transmission side, the active power flow value and reactive power flow value of each line on the transmission side, and the active power output value and reactive power output value of each generator unit on the transmission side using the Newton-Raphson power flow calculation method. The calculation process of the Newton-Raphson power flow calculation method is as follows: Establish a set of nodal power balance equations for the transmission-side power grid. The unknowns in the nodal power balance equations are the voltage amplitude and voltage phase angle of each node on the transmission side. Substitute the current power injection at the current junction as a known quantity into the nodal power balance equations, and set the initial values ​​of the voltage amplitude and voltage phase angle of each node on the transmission side. Calculate the unbalance in the nodal power balance equations, construct the Jacobian matrix, and solve the correction equations to obtain the voltage amplitude correction and voltage phase angle correction. Determine whether the absolute value of the unbalance is less than the preset convergence accuracy value. If the absolute value of the unbalance is less than the preset convergence accuracy value, then the current voltage amplitude and voltage phase angle are the calculation results. If the absolute value of the unbalance is not less than the preset convergence accuracy value, then update the voltage amplitude and voltage phase angle with the voltage amplitude correction and voltage phase angle correction, and recalculate the unbalance and the Jacobian matrix until the absolute value of the unbalance is less than the preset convergence accuracy value.

[0020] When the calculated voltage amplitude of each bus on the transmission side exceeds the corresponding lower or upper limit of voltage amplitude, or when the calculated combined value of active and reactive power flow of each line on the transmission side exceeds the corresponding thermal stability limit of power, or when the calculated active power output of each generator set on the transmission side exceeds the corresponding lower or upper limit of active power output, or when the calculated reactive power output of each generator set on the transmission side exceeds the corresponding lower or upper limit of reactive power output, the current power injection at the cutoff point minus a power step value is determined as the upper limit of the cutoff power allowed to be injected into the distribution side by the transmission side.

[0021] The operation control device starts with the current power injection at the junction and gradually decreases the power injection at the junction using a preset power step value. After each decrease, it calculates the voltage amplitude of each bus on the transmission side, the active and reactive power flow values ​​of each line on the transmission side, and the active and reactive power output values ​​of each generator unit on the transmission side using the Newton-Raphson power flow calculation method. If any of the above transmission side safety constraints are violated in the calculation results, the current power injection at the junction plus a power step value is determined as the lower limit of the junction power allowed to be injected into the distribution side by the transmission side.

[0022] The operation control device determines the range between the lower limit and the upper limit of the threshold power that the transmission side is allowed to inject into the distribution side as the threshold power range that the transmission side is allowed to inject into the distribution side.

[0023] Voltage constraints on internal nodes of the distribution side refer to the requirement that the voltage amplitude of each node within the distribution side must be maintained between the lower limit and the upper limit of the distribution side voltage amplitude. The operation control device maps the distribution side carrying capacity based on the shut-in power range and the voltage constraints of the internal nodes of the distribution side to obtain the shut-in power range, as detailed in steps 101 to 104.

[0024] Step 20: Based on the power range that can be turned off and the power interval that can be turned off, overlap matching is performed to obtain the target power interval for power transmission and distribution. Based on the target power interval and the bus voltage deviation on the transmission side, the demand analysis on the transmission side is performed to obtain the expected power to be turned off from the transmission side to the distribution side.

[0025] Optionally, the operation control device overlaps and matches the severable power range with the severable power interval to obtain the target power interval for power transmission and distribution. Specifically, the process is as follows: compare the lower limit of the severable power range with the lower limit of the severable power interval, and determine the larger of the two as the lower limit of the target power interval. Compare the upper limit of the severable power range with the upper limit of the severable power interval, and determine the smaller of the two as the upper limit of the target power interval. If the lower limit of the target power interval is not greater than the upper limit of the target power interval, the target power interval is valid; if the lower limit of the target power interval is greater than the upper limit of the target power interval, it indicates that the severable power range and the severable power interval do not overlap, and a coordination failure alarm is issued.

[0026] The bus voltage deviation on the transmission side refers to the difference between the current voltage amplitude of each bus on the transmission side and the rated voltage amplitude of each bus on the transmission side. The rated voltage amplitude of each bus on the transmission side refers to the standard voltage amplitude value that each bus on the transmission side should maintain under normal operating conditions.

[0027] The operation control device performs transmission-side demand analysis based on the target power range and the bus voltage deviation on the transmission side. Specifically, the process involves calculating the bus voltage deviation for each bus on the transmission side. For each bus on the transmission side, the operation control device subtracts the rated voltage amplitude of the bus from its current voltage amplitude to obtain the bus voltage deviation. It then determines whether there are any buses whose absolute voltage deviation exceeds a preset voltage deviation threshold. If no bus has an absolute voltage deviation exceeding the preset threshold, it indicates that the voltage of all buses on the transmission side is within the normal range, and the transmission side does not require voltage support from the distribution side. The median value of the target power range is then determined as the expected threshold power sent from the transmission side to the distribution side. If a bus has an absolute voltage deviation exceeding the preset threshold, the reactive power demand from the transmission side to the distribution side is calculated. The calculation process for the reactive power demand of the transmission side on the distribution side is as follows: Select the bus with the largest absolute value of the bus voltage deviation as the target bus. Multiply the bus voltage deviation of the target bus by the voltage-reactive power sensitivity value of the transmission side at the target bus to obtain the reactive power compensation amount required by the transmission side at the target bus. Take the negative value of this reactive power compensation amount as the reactive power demand of the transmission side on the distribution side. The voltage-reactive power sensitivity value refers to the ratio between the voltage amplitude change of the target bus and the reactive power injection change at the target bus.

[0028] The operation control device converts the reactive power demand from the transmission side to the distribution side into the active power adjustment at the junction. The specific calculation process is as follows: divide the reactive power demand from the transmission side to the distribution side by the power factor at the junction to obtain the apparent power adjustment at the junction. Multiply the apparent power adjustment at the junction by the power factor at the junction to obtain the active power adjustment at the junction.

[0029] The operation control device adds the midpoint of the target power range to the active power adjustment at the cutoff point to obtain the preliminary expected cutoff power. It then determines whether the preliminary expected cutoff power is within the target power range. If it is, the preliminary expected cutoff power is determined as the expected cutoff power sent from the transmission side to the distribution side. If the preliminary expected cutoff power is less than the lower limit of the target power range, the lower limit of the target power range is determined as the expected cutoff power sent from the transmission side to the distribution side. If the preliminary expected cutoff power is greater than the upper limit of the target power range, the upper limit of the target power range is determined as the expected cutoff power sent from the transmission side to the distribution side.

[0030] Step 30: Perform a feasibility analysis on the distribution side based on the expected threshold power and the target power range to obtain the target threshold power actually executed on the distribution side.

[0031] Optionally, the operation control device performs a feasibility analysis on the distribution side based on the desired threshold power and the target power range to obtain the target threshold power actually executed on the distribution side, as detailed in steps 301 to 305.

[0032] Step 40: Based on the target gate power and the operating status of the compensation equipment inside the distribution side, voltage deviation is eliminated to obtain the coordinated voltage regulation result of each node on the distribution side restoring the voltage to the qualified range.

[0033] Optionally, the operation control device eliminates voltage deviation based on the target gate power and the operating status of the compensation equipment inside the distribution side, and obtains the coordinated voltage regulation result that restores the voltage of each node on the distribution side to the qualified range, as in steps 401 to 404.

[0034] Compensation equipment refers to devices within the distribution side used to provide reactive power compensation or voltage support, including static var compensators (SVCs), static synchronous compensators (SNCs), parallel capacitor banks, parallel reactor banks, and distributed power inverters with reactive power regulation capabilities. Operating status refers to the current operating mode of the compensation equipment, its current output reactive power value, and its current remaining adjustable capacity. Acceptable range refers to the range between the lower limit and the upper limit of the distribution side voltage amplitude.

[0035] The embodiments of the present invention supplement the missing interactive confirmation mechanism for the safety constraints of power flow at the control point in the traditional control mode through a collaborative process of hierarchical verification, bidirectional matching, and closed-loop correction. This effectively avoids the risk of grid oscillation and protection maloperation caused by the conflict between the regulation actions on both sides of the power transmission and distribution under extreme operating conditions, and ensures the voltage control safety and collaborative stability of the power transmission and distribution network in the dynamic interaction process.

[0036] Optionally, the process of steps 101 to 104 includes: Step 101: Using the upper and lower limits of the power range at the junction as the input boundary of the carrying capacity mapping, perform the ground state power flow calculation on the distribution side to obtain the ground state voltage amplitude sequence of each node on the distribution side.

[0037] Optionally, the operation control device acquires the power grid topology parameters on the distribution side. The power grid topology parameters on the distribution side include the line impedance values ​​between each node on the distribution side, the load power values ​​connected to each node on the distribution side, the output values ​​of distributed power sources connected to each node on the distribution side, and the turns ratio parameters of each transformer on the distribution side.

[0038] The operation control device uses the lower and upper limits of the gate power range as input conditions for two basic state power flow calculations. For each basic state power flow calculation, the forward-backward substitution power flow calculation method is used. The calculation process of the forward-backward substitution power flow calculation method is as follows: the initial values ​​of the voltage amplitude and voltage phase angle of each node on the distribution side are set. The initial value of the voltage amplitude of each node is set to the rated voltage value of the distribution side, and the initial value of the voltage phase angle of each node is set to 0 degrees.

[0039] The back-substitution process is as follows: Starting from the last node on the distribution side, the power loss and power flow on each line are calculated sequentially from the end to the beginning. The power flow of each line is equal to the load power value of the last node of the line minus the output value of the distributed power source connected to the node, plus the power flow and power loss of all downstream lines of the line.

[0040] The forward push process is performed as follows: Starting from the junction node on the distribution side, the voltage amplitude and voltage phase angle of each node are calculated sequentially from the beginning to the end of the line. The voltage amplitude of the terminal node of each line is equal to the voltage amplitude of the terminal node of that line minus the voltage drop on that line. The voltage drop is calculated using the power flow and line impedance values ​​on that line. The back-substitution and forward push processes are executed alternately until the absolute value of the change in the voltage amplitude of each node obtained from two consecutive iterations is less than the preset iteration convergence accuracy value. At this point, the voltage amplitude of each node is the final result of the ground-state power flow calculation.

[0041] The operation control device uses the lower limit of the power range at the junction as the power injection amount at the junction. It then calculates the base-state voltage amplitude sequence of each node on the distribution side under this lower limit condition using a forward-backward power flow calculation method, denoted as the lower limit base-state voltage amplitude sequence. Similarly, the operation control device uses the upper limit of the power range at the junction as the power injection amount at the junction. It then calculates the base-state voltage amplitude sequence of each node on the distribution side under this upper limit condition using a forward-backward power flow calculation method, denoted as the upper limit base-state voltage amplitude sequence.

[0042] Step 102: Based on the ground state voltage amplitude sequence of each node on the distribution side and the voltage constraints of the internal nodes on the distribution side, compare them point by point to select nodes that exceed the voltage constraints as voltage over-limit nodes.

[0043] Optionally, the operation control device determines the voltage amplitude of each node in the lower limit ground-state voltage amplitude sequence and the upper limit ground-state voltage amplitude sequence, respectively. For each node, the voltage amplitude of the node is compared with the lower limit of the distribution-side voltage amplitude and with the upper limit of the distribution-side voltage amplitude. If the voltage amplitude of the node is less than the lower limit of the distribution-side voltage amplitude or greater than the upper limit of the distribution-side voltage amplitude, the node is marked as a voltage-over-limit node. A voltage-over-limit node refers to an internal node on the distribution side whose voltage amplitude exceeds the range specified by the voltage constraints of the internal nodes on the distribution side in the ground-state power flow calculation results.

[0044] After comparing the lower limit ground state voltage amplitude sequence point by point, the operation control device records the nodes that exceed the voltage constraint as the lower limit voltage over-limit node set. After comparing the upper limit ground state voltage amplitude sequence point by point, the nodes that exceed the voltage constraint are recorded as the upper limit voltage over-limit node set.

[0045] The operation control device determines the voltage over-limit node set by the union of the lower limit voltage over-limit node set and the upper limit voltage over-limit node set.

[0046] Step 103: Based on the analysis of the topological connection relationship on the distribution side and the existence of direct electrical connection path branches for voltage over-limit nodes, sensitive electrical branches are obtained. Based on the sensitive electrical branches and the ground state voltage amplitude sequence of each node on the distribution side, the voltage response gradient of each sensitive electrical branch to the gate power is generated.

[0047] Optionally, the operation control device acquires the topology connections on the distribution side. The topology connections on the distribution side refer to the connection correspondence between each node and each branch on the distribution side, specifically recording the starting and ending nodes of each branch. For each voltage-limiting node in the set of voltage-limiting nodes, starting from the gate node, a unique path is searched to reach the voltage-limiting node from the gate node according to the topology connections on the distribution side. Since the power grid topology on the distribution side is a radial structure, there is only one unique path from the gate node to any internal node on the distribution side. All branches included on this unique path are identified as the direct electrical connection paths corresponding to the voltage-limiting node.

[0048] The operation control device merges and deduplicates the direct electrical connection path branches corresponding to all voltage over-limit nodes to obtain a set of sensitive electrical branches. For each sensitive electrical branch in the set, the voltage amplitude of the terminal node of the sensitive electrical branch is extracted from the lower limit ground state voltage amplitude sequence obtained in step 101 and recorded as the lower limit terminal voltage amplitude. The voltage amplitude of the terminal node of the sensitive electrical branch is also extracted from the upper limit ground state voltage amplitude sequence obtained in step 101 and recorded as the upper limit terminal voltage amplitude. The operation control device divides the difference between the upper limit terminal voltage amplitude and the lower limit terminal voltage amplitude by the difference between the upper and lower limits of the threshold power range to obtain the voltage response gradient of the sensitive electrical branch to the threshold power.

[0049] Step 104: Based on the voltage response gradient of each sensitive electrical branch, converge the upper and lower power limits to obtain the shut-off power range.

[0050] Optionally, the operation control device performs power upper and lower limit convergence based on the voltage response gradient of each sensitive electrical branch to obtain the shut-off power range, as described in steps 1041 to 1044.

[0051] The embodiments of the present invention, under the premise of fully considering the voltage constraints of the internal nodes of the distribution side, accurately determine the power range that the distribution side can safely carry at the junction, avoiding the problem of the distribution network node voltage deterioration caused by the upper-level transmission dispatch center forcibly specifying power without sensing the actual operating margin of the distribution side, thereby ensuring the voltage control safety and coordinated stability of the transmission and distribution network in the dynamic interaction process.

[0052] Optionally, the process of steps 1041 to 1044 includes: Step 1041: Arrange the voltage response gradients of each sensitive electrical branch according to the size order to obtain the gradient sorting sequence.

[0053] Optionally, the operation control device takes the absolute value of the voltage response gradient of each sensitive electrical branch to obtain the absolute value of the voltage response gradient of each sensitive electrical branch. The reason for taking the absolute value is that the sign of the voltage response gradient only indicates the direction of voltage change with the switching power, while the absolute value of the voltage response gradient indicates the sensitivity of the voltage to changes in switching power. The larger the absolute value, the more sensitive the voltage amplitude at the end node of the sensitive electrical branch is to changes in switching power. The operation control device arranges the absolute values ​​of the voltage response gradient of each sensitive electrical branch in descending order to obtain a gradient sorting sequence. Each element in the gradient sorting sequence contains the corresponding sensitive electrical branch identifier, the original value of the voltage response gradient of that sensitive electrical branch, and the absolute value of the voltage response gradient of that sensitive electrical branch.

[0054] Step 1042: Based on the voltage response gradient corresponding to the first element in the gradient sorting sequence, the ground state voltage amplitude of the corresponding node in the voltage over-limit node, and the voltage constraints of the internal nodes on the distribution side, determine the power change that causes the voltage of the corresponding node to return to the voltage constraints of the internal nodes on the distribution side.

[0055] Optionally, the operation control device obtains the sensitive electrical branch corresponding to the first element in the gradient sorting sequence and determines the terminal node of the sensitive electrical branch. It then determines whether the terminal node belongs to the voltage over-limit node set. If the terminal node does not belong to the voltage over-limit node set, it skips that element and continues processing the next element in the gradient sorting sequence until an element belonging to the voltage over-limit node set is found. If the terminal node belongs to the voltage over-limit node set, it further determines the over-limit type of the terminal node. Over-limit types include upper limit over-limit and lower limit over-limit. Upper limit over-limit means that the voltage amplitude of the terminal node is higher than the upper limit value of the distribution side voltage amplitude. Lower limit over-limit means that the voltage amplitude of the terminal node is lower than the lower limit value of the distribution side voltage amplitude.

[0056] When the terminal node experiences an upper limit exceedance, the operation control device extracts the voltage amplitude of the terminal node from the lower limit ground state voltage amplitude sequence. It then subtracts the upper limit of the distribution-side voltage amplitude from this voltage amplitude to obtain the upper limit exceedance. The upper limit exceedance refers to the amount by which the voltage amplitude of the terminal node exceeds the upper limit of the distribution-side voltage amplitude. Dividing the upper limit exceedance by the voltage response gradient of the sensitive electrical branch yields the power change required to bring the terminal node voltage back to the upper limit of the distribution-side voltage amplitude, denoted as the upper limit return power change. Since the voltage response gradient is negative and the upper limit exceedance is positive, the upper limit return power change is negative, indicating that the power injection at the junction needs to be reduced (i.e., adjusted in a more negative direction) to lower the voltage below the upper limit of the distribution-side voltage amplitude.

[0057] When the terminal node experiences a lower limit exceedance, the operation control device extracts the voltage amplitude of the terminal node from the upper limit ground state voltage amplitude sequence. It then subtracts the lower limit of the distribution-side voltage amplitude from this voltage amplitude to obtain the lower limit exceedance. The lower limit exceedance refers to the amount by which the voltage amplitude of the terminal node falls below the lower limit of the distribution-side voltage amplitude; this value is negative. Dividing the lower limit exceedance by the voltage response gradient of the sensitive electrical branch yields the power change required to bring the terminal node voltage back to the lower limit of the distribution-side voltage amplitude, denoted as the lower limit return power change. Since the voltage response gradient is negative and the lower limit exceedance is negative, the lower limit return power change is positive, indicating that the power injection at the junction needs to be reduced (i.e., adjusted back from the upper limit) to raise the voltage above the lower limit of the distribution-side voltage amplitude.

[0058] The changes in upper limit regression power and lower limit regression power are defined as power changes.

[0059] Step 1043: Update the upper and lower power limits in the load capacity mapping input boundary based on the power change, and use the updated upper power limit as the new load capacity mapping input edge to perform the above steps until there are no voltage over-limit nodes, and output the final converged upper and lower power limits.

[0060] Optionally, the operation control device adds the upper limit regression power change to the lower limit power value of the current load capacity mapping input boundary to obtain the updated lower limit power value, and adds the lower limit regression power change to the upper limit power value of the current load capacity mapping input boundary and then subtracts the upper limit power value of the current load capacity mapping input boundary itself. That is, the upper limit power value of the current load capacity mapping input boundary is subtracted from the lower limit regression power change to obtain the updated upper limit power value.

[0061] Specifically, the upper and lower power limits in the load capacity mapping input boundary are updated according to the following rules: For updating the lower power limit: determine if there is an upper limit regression power change. If there is an upper limit regression power change, the operation control device adds the absolute value of the upper limit regression power change to the current load capacity mapping input boundary lower power limit value to obtain the updated lower power limit value.

[0062] Since the change in upper bound regression power is negative, its absolute value indicates the extent to which the lower bound power needs to be increased, i.e., the lower bound power needs to be contracted from a more negative direction to a positive direction. If there is no change in upper bound regression power, then the current lower bound power remains unchanged.

[0063] For updating the upper limit of power: determine whether there is a lower limit regression power change. If there is a lower limit regression power change, the operation control device subtracts the lower limit regression power change from the upper limit of power mapped to the current load capacity input boundary to obtain the updated upper limit of power.

[0064] Since the change in lower bound regression power is positive, its value represents the extent to which the power needs to contract negatively from the upper bound value. If there is no change in lower bound regression power, then the current upper bound value remains unchanged.

[0065] The operation control device uses the updated upper and lower power limits as the new carrying capacity mapping input boundaries and re-executes steps 101 to 103. During the re-execution, the operation control device uses the updated lower and upper power limits as the input conditions for the two basic power flow calculations, respectively, to recalculate the basic voltage amplitude sequence of each node on the distribution side, re-perform point-by-point comparisons to screen for voltage-limit-exceeding nodes, redetermine sensitive electrical branches, and generate voltage response gradients.

[0066] The operation control device determines whether voltage-limit-crossing nodes still exist after re-execution. If voltage-limit-crossing nodes still exist, steps 1041 to 1043 are executed again to update the upper and lower power limits in the load-bearing capacity mapping input boundary. If no voltage-limit-crossing nodes exist, the iteration process terminates, and the current lower and upper power limits are output as the final converged power upper and lower limits. The final converged power upper and lower limits refer to the lower and upper limits of the power injection at the threshold that ensures the voltage amplitude of all nodes within the distribution side meets the voltage constraints of the nodes within the distribution side after multiple rounds of iteration and convergence.

[0067] Step 1044: Determine the gate-closable power range based on the upper and lower limits of the final convergence power.

[0068] Optionally, the operation control device uses the lower limit of the final convergence power as the lower limit of the gateable power range, uses the upper limit of the final convergence power as the upper limit of the gateable power range, and defines the interval between the lower limit of the final convergence power and the upper limit of the final convergence power as the gateable power range.

[0069] The embodiments of the present invention accurately determine the power range that the distribution side can safely carry at the junction, avoiding the problem of voltage deterioration at distribution network nodes caused by the upper-level transmission dispatch center forcibly specifying power without sensing the actual operating margin of the distribution side. This ensures the voltage control safety and coordinated stability of the transmission and distribution network during dynamic interaction.

[0070] Optionally, the processes of steps 301 to 305 include: Step 301: If the expected threshold power is less than the lower boundary value of the target power range, then the lower boundary value is determined as the reference threshold power. If the expected threshold power is greater than the upper boundary value of the target power range, then the upper boundary value is determined as the reference threshold power. If the expected threshold power is within the target power range, then the expected threshold power is determined as the reference threshold power.

[0071] Optionally, the operation control device determines whether the expected threshold power is less than the lower limit boundary value of the target power range. If the expected threshold power is less than the lower limit boundary value of the target power range, it indicates that the power the transmission side expects the distribution side to absorb is lower than the minimum power value that the distribution side can withstand under the condition of satisfying the safety constraints of both parties, and the lower limit boundary value of the target power range is determined as the reference threshold power. If the expected threshold power is not less than the lower limit boundary value of the target power range, it determines whether the expected threshold power is greater than the upper limit boundary value of the target power range. If the expected threshold power is greater than the upper limit boundary value of the target power range, it indicates that the power the transmission side expects the distribution side to absorb exceeds the maximum power value that the distribution side can withstand under the condition of satisfying the safety constraints of both parties, and the upper limit boundary value of the target power range is determined as the reference threshold power. If the expected threshold power is not greater than the upper limit boundary value of the target power range, it indicates that the expected threshold power is within the target power range, that is, the expected threshold power is greater than or equal to the lower limit boundary value of the target power range and less than or equal to the upper limit boundary value of the target power range, and the expected threshold power is determined as the reference threshold power.

[0072] Step 302: Based on the reference gate power, the distributed power output data, load demand data and network topology of the distribution side, power flow calculation is performed to obtain the voltage distribution data of each node and the current distribution data of each branch.

[0073] Optionally, the operation control device acquires distributed power output data, load demand data, and network topology from the distribution side. The network topology includes the correspondence between the first and last nodes of each branch and the line impedance value of each branch.

[0074] The operation control device uses the reference gate power as the power injection amount at the gate node. Assuming the power factor at the gate is a known value, the reactive power injection amount at the gate is calculated based on the reference gate power and the power factor. The reactive power injection amount at the gate is equal to the reference gate power multiplied by the tangent value corresponding to the power factor.

[0075] The operation control device uses a forward-backward power flow calculation method. The calculation process is as follows: Initial values ​​for the voltage amplitude and phase angle of each node on the distribution side are set. The initial voltage amplitude of each node is set to the rated voltage of the distribution side, and the initial phase angle of each node is set to 0 degrees. The backward substitution process: Starting from the last node on the distribution side, the power flow on each branch is calculated sequentially from the end to the beginning. The power flow of each branch equals the load demand of the last node of that branch minus the output of the distributed power source connected to that last node, plus the power flow of all downstream branches and the power loss of that branch itself. The forward-pushing process: Starting from the junction node on the distribution side, the voltage amplitude and phase angle of each node are calculated sequentially from the beginning to the end. The voltage amplitude of the last node of each branch equals the voltage amplitude of the first node of that branch minus the voltage drop on that branch. The voltage drop is calculated using the power flow and line impedance of that branch. The back-substitution process and the forward-pushing process are executed alternately until the absolute value of the change in the voltage amplitude of each node calculated in two adjacent iterations is less than the preset iteration convergence accuracy value. At this time, the voltage amplitude and voltage phase angle of each node are the voltage distribution data of each node.

[0076] The operation control device calculates the current distribution data of each branch based on the voltage distribution data of each node. For each branch, the power flow value of the branch is divided by the voltage amplitude of the terminal node of the branch to obtain the current amplitude of the branch. The current amplitudes of all branches constitute the current distribution data of each branch.

[0077] Step 303: Determine the constraint violation set by identifying nodes whose voltage distribution data exceeds the acceptable voltage range on the distribution side as over-limit nodes and branches whose current distribution data exceeds the current carrying capacity of the distribution side as overloaded branches.

[0078] Optionally, the operation control device checks the voltage distribution data of each node one by one. For each node within the distribution side (excluding junction nodes), the voltage amplitude of the node is compared with the lower limit of the distribution side voltage amplitude and with the upper limit of the distribution side voltage amplitude. If the voltage amplitude of the node is less than the lower limit of the distribution side voltage amplitude or greater than the upper limit of the distribution side voltage amplitude, the node is recorded as an over-limit node.

[0079] The operation control device checks the current distribution data of each branch one by one. For each branch on the distribution side, it compares the current amplitude of the branch with the current carrying capacity of the branch. If the current amplitude of the branch is greater than the current carrying capacity of the branch, the branch is recorded as an overloaded branch.

[0080] The operation control device merges all out-of-limit nodes and all overloaded branches into a constraint violation set.

[0081] Step 304: If the constraint violation set is empty, the target power range is determined as the power search range. If the constraint violation set is not empty, starting from the reference threshold power, a step-size search is performed in both the power decreasing direction and the power increasing direction until the constraint violation set corresponding to the searched power point is empty. Based on the minimum and maximum power values ​​that satisfy the safety constraints, the power search range is determined.

[0082] Optionally, the operation control device first determines whether the constraint violation set is empty.

[0083] If the constraint violation set is empty, it means that under the reference threshold power condition, the voltage amplitude of all nodes inside the distribution side is within the voltage qualification range of the distribution side, and the current amplitude of all branches on the distribution side does not exceed the current carrying capacity of the corresponding branch. That is, the distribution side can safely implement the reference threshold power and directly determine the target power range as the power search range.

[0084] If the constraint violation set is non-empty, it indicates that under the reference gate power condition, there are nodes or branches within the distribution side that do not meet the safety constraints, and the distribution side cannot safely execute the reference gate power. The operation control device starts with the reference gate power and performs step-size searches in both the decreasing and increasing power directions. The step-size search refers to gradually changing the power injection value at the gate at preset power search step intervals, and re-executing the power flow calculation in step 302 and the constraint violation set determination process in step 303 at each power point until the constraint violation set corresponding to the searched power point is empty.

[0085] The specific process of performing a step-size search in the power reduction direction is as follows: Subtract one power search step size from the reference gate power to obtain the first search power point in the power reduction direction. Use this search power point as the power injection amount at the gate, and re-execute the power flow calculation in step 302 and the constraint violation set determination process in step 303. If the constraint violation set corresponding to the search power point is empty, then record the search power point as a safe power point in the power reduction direction, and the search in the power reduction direction ends. If the constraint violation set corresponding to the search power point is not empty, continue to subtract one power search step size from the search power point to obtain the next search power point in the power reduction direction, and repeat the above process until the constraint violation set corresponding to the searched power point is empty, or the search power point is less than the lower boundary value of the target power interval. If no power point with an empty constraint violation set is found when the search power point is less than the lower boundary value of the target power interval, then the search in the power reduction direction terminates, and no safe power point in the power reduction direction is generated.

[0086] The specific process of performing a step-size search in the direction of increasing power is as follows: Add one power search step size to the reference gate power to obtain the first search power point in the direction of increasing power. Use this search power point as the power injection amount at the gate, and re-execute the power flow calculation in step 302 and the constraint violation set determination process in step 303. If the constraint violation set corresponding to the search power point is empty, record the search power point as a safe power point in the direction of increasing power, and the search in the direction of increasing power ends. If the constraint violation set corresponding to the search power point is not empty, continue to add one power search step size to the search power point to obtain the next search power point in the direction of increasing power, and repeat the above process until the constraint violation set corresponding to the searched power point is empty, or the search power point is greater than the upper boundary value of the target power interval. If no power point with an empty constraint violation set is found when the search power point is greater than the upper boundary value of the target power interval, the search in the direction of increasing power terminates, and no safe power point in the direction of increasing power is generated.

[0087] The operation control device determines the power search interval based on the minimum and maximum power values ​​that satisfy safety constraints. The minimum power value satisfying the safety constraints refers to the safe power point in the decreasing direction; if no safe power point exists in the decreasing direction, the minimum power value satisfying the safety constraints is the reference threshold power. The maximum power value satisfying the safety constraints refers to the safe power point in the increasing direction; if no safe power point exists in the increasing direction, the maximum power value satisfying the safety constraints is the reference threshold power. The interval between the minimum and maximum power values ​​satisfying the safety constraints is defined as the power search interval.

[0088] Step 305: Based on the power search range and the target power range, perform demand analysis on the transmission side to obtain the expected gate power sent from the transmission side to the distribution side.

[0089] Optionally, the operation control device performs demand analysis on the transmission side based on the power search range and the target power range to obtain the expected gate power sent from the transmission side to the distribution side, as detailed in steps 3051 to 3054.

[0090] The embodiments of the present invention, under the premise of fully considering the actual operating status and safety constraints of the distribution side, accurately determine the threshold power that the distribution side can actually safely execute, avoiding voltage deterioration or equipment overload caused by the upper-level transmission dispatch center forcibly specifying fixed power commands and ignoring the actual operating margin of the distribution network, thereby ensuring the voltage control safety and coordinated stability of the transmission and distribution network in the dynamic interaction process.

[0091] Optionally, the processes of steps 3051 to 3054 include: Step 3051: Based on the overlap of the power search interval and the target power interval, the physical safe power interval of the distribution side is obtained, and based on the common part of the physical safe power interval and the target power interval, the common feasible power is determined.

[0092] Optionally, the operation control device compares the lower limit of the power search interval with the lower boundary value of the target power interval, and determines the larger of the two values ​​as the lower limit of the physically safe power interval. It also compares the upper limit of the power search interval with the upper boundary value of the target power interval, and determines the smaller of the two values ​​as the upper limit of the physically safe power interval. If the lower limit of the physically safe power interval is not greater than the upper limit of the physically safe power interval, then the physically safe power interval is valid, and the interval between the lower limit and the upper limit of the physically safe power interval is defined as the physically safe power interval.

[0093] If the lower limit of the physical safety power range is greater than the upper limit of the physical safety power range, it means that the power search range and the target power range do not intersect, and the physical safety power range is empty.

[0094] The operation control device determines the common feasible power based on the common portion of the physical safe power range and the target power range. The common feasible power refers to the set of power values ​​corresponding to the common portion of the physical safe power range and the target power range. Since the physical safe power range itself is the intersection of the power search range and the target power range, the physical safe power range must be completely contained within the target power range. Therefore, the common portion of the physical safe power range and the target power range is the physical safe power range itself, and the physical safe power range is determined as the common feasible power.

[0095] Step 3052: If the common feasible power is empty, calculate the distance between the two boundary values ​​of the target power range and the physical safe power range on the distribution side, and select the boundary value with the closest distance as the final feasible power. If the common feasible power is not empty, then the common feasible power is used as the final feasible power.

[0096] Optionally, the operation control device calculates the distance between the lower boundary value of the target power range and the physical safe power range, and the distance between the upper boundary value of the target power range and the physical safe power range, respectively. Specifically, the calculation method is as follows: if the lower boundary value of the target power range is less than the lower limit value of the physical safe power range, the distance is equal to the lower limit value of the physical safe power range minus the lower boundary value of the target power range; if the lower boundary value of the target power range is greater than the upper limit value of the physical safe power range, the distance is equal to the lower boundary value of the target power range minus the upper limit value of the physical safe power range; if the lower boundary value of the target power range is within the physical safe power range, the distance is 0. The calculation method for the distance between the upper boundary value of the target power range and the physical safe power range is similar.

[0097] The operation control device compares the two distances and selects the boundary value of the target power range corresponding to the smaller distance as the final feasible power. If the two distances are equal, the lower boundary value of the target power range is selected as the final feasible power.

[0098] If the common feasible power is not empty, it means that there is an intersection between the power search interval and the target power interval. Under the current operating state, the distribution side can find the power value that meets all safety constraints within the target power interval and directly use the common feasible power as the final feasible power.

[0099] Step 3053: Calculate the absolute value of the difference between the final feasible power and the reference threshold power, and select the power value with the smallest absolute value of the difference to determine the pre-selected execution power.

[0100] Optionally, the operation control device determines the type of the final feasible power. If the final feasible power is a power range, the reference threshold power is compared with the range of the final feasible power.

[0101] If the reference gate power is within the range of the final feasible power, that is, the reference gate power is greater than or equal to the lower limit of the final feasible power range and less than or equal to the upper limit of the final feasible power range, then the absolute value of the difference between the reference gate power and a certain power value of the final feasible power is 0, and the reference gate power is determined as the pre-selected execution power.

[0102] If the reference gate power is less than the lower limit of the final feasible power range, then the power with the smallest absolute value of the difference between the reference gate power and the final feasible power range is the lower limit of the final feasible power range, and the lower limit of the final feasible power range is determined as the pre-selected execution power.

[0103] If the reference gate power is greater than the upper limit of the final feasible power range, then the power with the smallest absolute value of the difference between the reference gate power and the final feasible power range is the upper limit of the final feasible power range, and the upper limit of the final feasible power range is determined as the pre-selected execution power.

[0104] If the final feasible power is a single power value, then that single power value is determined as the pre-selected execution power.

[0105] Step 3054: Based on the reactive power balance demand on the distribution side corresponding to the pre-selected execution power and the physical adjustment limit range of the reactive power compensation equipment on the distribution side. If the reactive power balance demand is within the physical adjustment limit range, the pre-selected execution power is determined as the target cut-off power actually executed on the distribution side. If the reactive power balance demand exceeds the physical adjustment limit range, the boundary value with the smallest absolute value of active power in the target power range is determined as the target cut-off power actually executed on the distribution side.

[0106] Optionally, the operation control device uses the pre-selected execution power as the power injection amount at the gate and calculates the voltage amplitude of each node on the distribution side using the forward-backward power flow calculation method. The calculation process of the forward-backward power flow calculation method has been described in detail in step 302 above and will not be repeated here.

[0107] The operation control device checks whether the voltage amplitude of each node on the distribution side exceeds the acceptable voltage range of the distribution side. If the voltage amplitude of each node on the distribution side is within the acceptable voltage range of the distribution side, then the reactive power balance requirement on the distribution side is 0.

[0108] If the voltage amplitude of a node on the distribution side exceeds the acceptable voltage range, calculate the reactive power compensation requirement for each node exceeding the limit. For each node exceeding the limit, calculate the voltage deviation of that node. The voltage deviation is equal to the voltage amplitude of the node minus the lower limit of the distribution side voltage amplitude (when the voltage amplitude is lower than the lower limit of the distribution side voltage amplitude) or the voltage amplitude minus the upper limit of the distribution side voltage amplitude (when the voltage amplitude is higher than the upper limit of the distribution side voltage amplitude).

[0109] The operation control device divides the voltage deviation of the over-limit node by the voltage-reactive power sensitivity value of the over-limit node to obtain the reactive power compensation requirement of the over-limit node. The voltage-reactive power sensitivity value refers to the ratio between the voltage amplitude change of the over-limit node and the reactive power injection change at the node.

[0110] The operation control device sums the absolute values ​​of the reactive power compensation requirements of all over-limit nodes to obtain the reactive power balance requirements on the distribution side.

[0111] The operation control device obtains the physical regulation limit range of the reactive power compensation equipment on the distribution side. Reactive power compensation equipment on the distribution side refers to the equipment within the distribution side used to provide reactive power compensation, including static var compensators (SVCs), static synchronous compensators (SNCs), parallel capacitor banks, parallel reactor banks, and distributed power inverters with reactive power regulation capabilities. The physical regulation limit range refers to the sum of the currently remaining available reactive power regulation capacity of all reactive power compensation equipment on the distribution side, including available capacitive reactive power capacity and available inductive reactive power capacity. The device then determines whether the reactive power balance demand on the distribution side is within the physical regulation limit range of the reactive power compensation equipment on the distribution side.

[0112] If the reactive power balance demand is not greater than the available capacitive reactive power capacity within the physical regulation limit range, and the reactive power balance demand is not less than the negative value of the available inductive reactive power capacity within the physical regulation limit range, then the reactive power balance demand is within the physical regulation limit range, and the pre-selected execution power is determined as the target cut-off power actually executed on the distribution side. If the reactive power balance demand is greater than the available capacitive reactive power capacity within the physical regulation limit range, or the reactive power balance demand is less than the negative value of the available inductive reactive power capacity within the physical regulation limit range, then the reactive power balance demand exceeds the physical regulation limit range, and the boundary value with the smallest absolute value of active power in the target power range is determined as the target cut-off power actually executed on the distribution side.

[0113] Based on fully considering the physical safety constraints of the distribution side, the voltage regulation requirements of the transmission side, and the reactive power compensation capability of the distribution side, the embodiments of the present invention accurately determine the target threshold power that the distribution side can actually safely execute, thus ensuring the voltage control safety and coordinated stability of the transmission and distribution network during dynamic interaction.

[0114] Optionally, the processes of steps 401 to 404 include: Step 401: Based on the target gate power, the network topology on the distribution side, the output data of distributed power sources, the load data, and the switching status data of the compensation equipment, power flow calculation is performed to obtain the voltage amplitude of each node.

[0115] Optionally, the operation control device acquires the switching position data of each reactive power compensation device and determines the reactive power output value currently injected into the corresponding node by each reactive power compensation device according to the switching position number.

[0116] The operation control device uses the target gate power as the active power injection at the gate node, and calculates the reactive power injection at the gate based on the power factor at the gate. The reactive power injection at the gate is equal to the target gate power multiplied by the tangent value corresponding to the power factor.

[0117] The operation control device adds the current reactive power output value of each reactive power compensation device to the reactive power injection amount of the corresponding node. For a node equipped with reactive power compensation device, the net reactive power injection amount of the node is equal to the reactive power output value of the distributed power source of the node minus the reactive power demand value of the load of the node, plus the reactive power output value of the reactive power compensation device at the node.

[0118] The operation control device uses the forward-backward power flow calculation method for calculation. The calculation process of the forward-backward power flow calculation method has been described in detail in step 302 above, and will not be repeated here. After iterative calculation using the forward-backward power flow calculation method, the calculation ends when the absolute value of the change in the voltage amplitude of each node obtained from two adjacent iterations is less than the preset iteration convergence accuracy value, and the voltage amplitude of each node is obtained.

[0119] Step 402: Nodes with voltage amplitudes lower than the lower limit of the qualified voltage range are designated as undervoltage nodes, and nodes with voltage amplitudes higher than the upper limit of the qualified voltage range are designated as overvoltage nodes.

[0120] Optionally, the operation control device checks the voltage amplitude of each node (excluding the switch point node) within the distribution side. If the voltage amplitude of a node is less than the lower limit of the distribution side voltage amplitude, the node is marked as an undervoltage node. An undervoltage node refers to a distribution side node whose voltage amplitude is lower than the lower limit of the distribution side voltage amplitude under the current target switch point power and current compensation equipment switching position. If the voltage amplitude of a node is greater than the upper limit of the distribution side voltage amplitude, the node is marked as an overvoltage node. An overvoltage node refers to a distribution side node whose voltage amplitude is higher than the upper limit of the distribution side voltage amplitude under the current target switch point power and current compensation equipment switching position. If the voltage amplitude of a node is not less than the lower limit of the distribution side voltage amplitude and not greater than the upper limit of the distribution side voltage amplitude, then the voltage amplitude of the node is within the acceptable voltage range of the distribution side, and the node is neither an undervoltage node nor an overvoltage node. The operation control device groups all undervoltage nodes into an undervoltage node set and all overvoltage nodes into an overvoltage node set.

[0121] Step 403: If the undervoltage node and overvoltage node are empty, then the target gate power and the current switching position data of the internal compensation equipment on the distribution side are determined as the coordinated voltage regulation result.

[0122] Optionally, the operation control device determines whether both the undervoltage node set and the overvoltage node set are empty.

[0123] If both the undervoltage and overvoltage node sets are empty, it indicates that under the combined effect of the target threshold power and the current switching positions of the compensation equipment, the voltage amplitude of all nodes within the distribution side is within the acceptable voltage range, and there is no voltage exceeding the limit on the distribution side. The target threshold power and the current switching positions of the compensation equipment within the distribution side are defined as the coordinated voltage regulation result. The coordinated voltage regulation result refers to the final control scheme that restores the voltage of all nodes within the distribution side to the acceptable range through the coordinated efforts of both transmission and distribution parties. This includes the power injection amount at the threshold and the switching status of each compensation device within the distribution side.

[0124] If the set of undervoltage nodes is not empty or the set of overvoltage nodes is not empty, it means that under the combined effect of the target threshold power and the current switching position of the compensation equipment, there are still nodes with voltage exceeding the limit inside the distribution side, and it is necessary to further adjust the switching position of the compensation equipment to eliminate the voltage deviation.

[0125] Step 404: If the undervoltage and overvoltage nodes are not empty, for each undervoltage node, search for the compensation device with the smallest electrical connection path impedance and whose current switching position is less than the maximum allowable position to obtain candidate devices for voltage boosting. For each overvoltage node, search for the compensation device with the smallest electrical connection path impedance and whose current switching position is greater than the minimum allowable position to obtain candidate devices for voltage bucking. Based on the candidate devices for voltage boosting and voltage bucking, perform voltage deviation elimination to obtain the coordinated voltage regulation result.

[0126] Optionally, the operation control device performs a search process for candidate devices to be boosted for each undervoltage node in the set of undervoltage nodes. From the topology of the distribution side, it determines the electrical connection path from the undervoltage node to the node where each reactive power compensation device is located. An electrical connection path refers to the sequence of branches traversed from the undervoltage node along the branch connections of the distribution side to the node where the reactive power compensation device is located. The sum of the impedance magnitudes of all branches on each electrical connection path is calculated to obtain the path impedance value of that electrical connection path. The impedance magnitude is the square root of the sum of the squares of the real and imaginary parts of the branch path impedance. The reactive power compensation device corresponding to the electrical connection path with the smallest path impedance value is selected, and it is determined whether the current switching position number of the reactive power compensation device is less than the maximum allowable switching position number of the reactive power compensation device. The maximum allowable switching position number refers to the highest switching position number that the reactive power compensation device can be put into operation, corresponding to the maximum reactive power output capacity. If the current switching position number of the reactive power compensation device is less than the maximum allowable switching position number, it indicates that the reactive power compensation device still has the adjustment margin to increase the reactive power output by adjusting the switching position. This reactive power compensation device is then identified as a candidate device for voltage boosting corresponding to the undervoltage node. A candidate device for voltage boosting refers to a reactive power compensation device selected to provide additional capacitive reactive power support to the corresponding undervoltage node by adjusting the switching position, thereby increasing the voltage amplitude of the undervoltage node. If the current switching position number of the reactive power compensation device corresponding to the electrical connection path with the smallest path impedance is not less than the maximum allowable switching position number, then the next reactive power compensation device is searched in ascending order of path impedance value until a reactive power compensation device with a current switching position number less than the maximum allowable switching position number is found.

[0127] For each overvoltage node in the overvoltage node set, a search process for candidate devices to be stepped down is performed. From the distribution-side topology, the electrical connection paths from the overvoltage node to the nodes where each reactive power compensation device is located are determined, and the path impedance value of each electrical connection path is calculated. The reactive power compensation device corresponding to the electrical connection path with the smallest path impedance value is selected, and it is determined whether the current switching position number of the reactive power compensation device is greater than the minimum allowable switching position number of the reactive power compensation device. The minimum allowable switching position number refers to the lowest switching position number that the reactive power compensation device can be put into operation, corresponding to the minimum reactive power output capacity. If the current switching position number of the reactive power compensation device is greater than the minimum allowable switching position number, it indicates that the reactive power compensation device still has the adjustment margin to reduce the switching position to decrease reactive power output, and the reactive power compensation device is determined as a candidate device to be stepped down for the overvoltage node. Candidate devices for voltage reduction refer to reactive power compensation devices selected to reduce the capacitive reactive power injected into the corresponding overvoltage node or increase the absorption of inductive reactive power to lower the voltage amplitude of the overvoltage node by lowering the switching position. If the current switching position number of the reactive power compensation device corresponding to the electrical connection path with the smallest path impedance is not greater than the minimum allowable switching position number, then the next reactive power compensation device is searched in ascending order of path impedance value until a reactive power compensation device with a current switching position number greater than the minimum allowable switching position number is found.

[0128] The operation control device eliminates voltage deviations based on the candidate devices to be boosted and the candidate devices to be bucked, and obtains the coordinated voltage regulation result, as shown in steps 4041 to 4044.

[0129] This invention achieves precise control of the voltage at each node on the distribution side by adjusting the switching positions of the internal compensation equipment on the distribution side. This ensures that the voltage amplitude of all nodes on the distribution side is restored to the qualified range, avoiding the problem of increased safety risks to the distribution network due to voltage exceeding limits at local nodes on the distribution side. At the same time, through the coordinated cooperation between the transmission and distribution sides in terms of gate power and reactive power compensation, the overall voltage control accuracy and coordinated stability of the transmission and distribution network are improved.

[0130] Optionally, the processes of steps 4041 to 4044 include: Step 4041: Conflict detection is performed on the candidate device to be boosted and the candidate device to be bucked. If the same compensation device exists in the candidate device to be boosted and the candidate device to be bucked, the absolute value of the voltage deviation of their associated nodes is compared. The operating direction corresponding to the one with the larger absolute value of the voltage deviation is retained, and the other operating direction is eliminated to obtain the target boosting device and the target bucking device.

[0131] Optionally, the operation control device compares the identifiers of all compensation devices in the candidate device set for voltage boosting with those in the candidate device set for voltage reduction one by one. If the identifier of a compensation device exists in both the candidate device set for voltage boosting and the candidate device set for voltage reduction, it is determined that the compensation device has an operating direction conflict and is marked as a conflicting device. For each conflicting device, the undervoltage node associated with the conflicting device in the candidate device set for voltage boosting and the overvoltage node associated with the conflicting device in the candidate device set for voltage reduction are determined. The absolute value of the voltage deviation of the undervoltage node associated with the conflicting device is calculated, which is equal to the lower limit of the distribution side voltage amplitude minus the voltage amplitude of the undervoltage node. The absolute value of the voltage deviation of the overvoltage node associated with the conflicting device is also calculated, which is equal to the voltage amplitude of the overvoltage node minus the upper limit of the distribution side voltage amplitude.

[0132] The operation control device compares the absolute value of the voltage deviation of the undervoltage node associated with the conflicting device with the absolute value of the voltage deviation of the overvoltage node. If the absolute value of the voltage deviation of the undervoltage node is greater than that of the overvoltage node, it indicates that the voltage exceedance of the undervoltage node is more severe. The operating direction of the conflicting device in the set of candidate devices for voltage boosting is retained, and the conflicting device is removed from the set of candidate devices for voltage bucking. If the absolute value of the voltage deviation of the overvoltage node is greater than that of the undervoltage node, it indicates that the voltage exceedance of the overvoltage node is more severe. The operating direction of the conflicting device in the set of candidate devices for voltage bucking is retained, and the conflicting device is removed from the set of candidate devices for voltage boosting. If the absolute value of the voltage deviation of the undervoltage node is equal to that of the overvoltage node, the operating direction of the conflicting device in the set of candidate devices for voltage boosting is retained, and the conflicting device is removed from the set of candidate devices for voltage bucking.

[0133] After the operation control device completes the conflict resolution process for all compensation devices with conflicting operating directions, it identifies the remaining compensation devices in the candidate set for voltage boosting as target voltage boosting devices and the remaining compensation devices in the candidate set for voltage reduction as target voltage reduction devices. Target voltage boosting devices refer to the reactive power compensation devices that, after conflict detection and operating direction resolution, are ultimately determined to require an upward adjustment of their switching gear. Target voltage reduction devices refer to the reactive power compensation devices that, after conflict detection and operating direction resolution, are ultimately determined to require a downward adjustment of their switching gear.

[0134] If there is no compensation device identifier in both the set of candidate devices for voltage boosting and the set of candidate devices for voltage reduction, there is no conflict in the operation direction. The operation control device directly determines all compensation devices in the set of candidate devices for voltage boosting as the target voltage boosting device and all compensation devices in the set of candidate devices for voltage reduction as the target voltage reduction device.

[0135] Step 4042: Based on the target gear setting of each target boosting device being set to the current switching gear plus one step, a boosting command is generated; based on the target gear setting of each target depressurizing device being set to the current switching gear minus one step, a depressurizing command is generated, thus obtaining a comprehensive adjustment command.

[0136] Optionally, for each target booster device, the current switching gear number of the target booster device is obtained, and a step size is added to the current switching gear number of the target booster device to obtain the target gear number of the target booster device. A boost command containing the device identifier and the target gear number of the target booster device is then generated. If the current switching gear number of the target booster device, after adding a step size, exceeds the maximum allowable gear number of the target booster device, then the maximum allowable gear number of the target booster device is determined as the target gear number, and a boost command containing the device identifier and the maximum allowable gear number of the target booster device is generated.

[0137] For each target step-down device, obtain the current switching gear number of the target step-down device, subtract a step size from the current switching gear number to obtain the target gear number of the target step-down device, and generate a step-down command containing the device identifier and the target gear number of the target step-down device. If the result of subtracting a step size from the current switching gear number of the target step-down device is lower than the minimum allowable gear number of the target step-down device, then the minimum allowable gear number of the target step-down device is determined as the target gear number, and a step-down command containing the device identifier and the minimum allowable gear number of the target step-down device is generated.

[0138] The operation control device combines all boost commands and all buck commands into a comprehensive regulation command.

[0139] Step 4043: If the comprehensive adjustment command is empty, then the target gate power and the current switching position data of the internal compensation equipment on the distribution side are determined as the coordinated voltage regulation result.

[0140] Optionally, the situations where the comprehensive adjustment command is empty include: both the set of candidate devices to be boosted and the set of candidate devices to be deboosted are empty, or the current switching gear number of all candidate devices to be boosted has reached the maximum allowable gear number and the current switching gear number of all candidate devices to be deboosted has reached the minimum allowable gear number, resulting in the inability to generate a valid boost or deboost command.

[0141] The operation control device determines whether the comprehensive adjustment command is empty.

[0142] If the comprehensive adjustment command is empty, it means that all reactive power compensation equipment inside the distribution side has no adjustment margin, or there is no reactive power compensation equipment that needs to be adjusted in the switching position. The operation control device will determine the target threshold power and the current switching position data of the compensation equipment inside the distribution side as the result of coordinated voltage regulation.

[0143] Step 4044: If the integrated regulation command is not empty, update the switching position data of the internal compensation equipment on the distribution side based on the integrated regulation command and record the current regulation cycle. If the current regulation cycle is less than the maximum allowable regulation cycle, restart the power flow calculation process. If the current regulation cycle is equal to the maximum allowable regulation cycle, determine the target threshold power and the updated switching position data of the internal compensation equipment on the distribution side as the coordinated voltage regulation result.

[0144] Optionally, if the integrated adjustment command is not empty, it indicates that there are reactive power compensation devices that need to have their switching positions adjusted. The operation control device updates the switching position data of the internal compensation devices on the distribution side based on the integrated adjustment command. The specific process for updating the switching position data of the internal compensation devices on the distribution side is as follows: each boost and buck command in the integrated adjustment command is read one by one, and according to the compensation device identifier and target position number contained in the command, the current switching position number of the corresponding compensation device is updated to the target position number. After the update, the switching position data of each compensation device reflects the latest status after this round of adjustment.

[0145] The operation control device records the current adjustment cycle, which refers to the number of cycles from steps 4041 to 4044. During the first execution of step 4044, the current adjustment cycle is set to 1. In each subsequent cycle of executing step 4044, the current adjustment cycle is incremented by 1.

[0146] The maximum allowed adjustment cycle refers to the maximum number of times the operation control device is allowed to execute steps 4041 to 4044. This is used to prevent infinite looping due to insufficient adjustment capacity of the reactive power compensation equipment inside the distribution side. The maximum allowed adjustment cycle is a preset fixed value. The operation control device determines whether the current adjustment cycle is less than the maximum allowed adjustment cycle. If the current adjustment cycle is less than the maximum allowed adjustment cycle, it means that the adjustment operation is still allowed to continue. Using the updated switching position data of each compensation device as input, the power flow calculation process of step 401 is restarted. When step 401 is restarted, the power flow calculation is performed using the target gate power and the updated switching position data of each compensation device to obtain the new voltage amplitude of each node. Then, steps 402, 403, and 4041 to 4044 are executed sequentially until the voltage amplitude of all undervoltage and overvoltage nodes is restored to the qualified voltage range of the distribution side, or the current adjustment cycle reaches the maximum allowed adjustment cycle, or the comprehensive adjustment command is empty.

[0147] If the current adjustment cycle is equal to the maximum allowed adjustment cycle, it means that the maximum allowed number of adjustments has been reached, and further adjustment operations are not allowed. The operation control device will determine the target gate power and the updated switching gear data of the internal compensation equipment on the distribution side as the result of coordinated voltage regulation.

[0148] The embodiments of the present invention accurately eliminate the voltage deviation of each undervoltage and overvoltage node within the distribution side through coordinated voltage regulation, so that the voltage amplitude of all nodes within the distribution side is restored to the qualified range as much as possible, ensuring the internal voltage safety of the distribution side when actually executing the target gate power, and guaranteeing the voltage control safety and coordinated stability of the transmission and distribution network in the dynamic interaction process.

[0149] Furthermore, the transmission and distribution coordinated operation control device described below and the transmission and distribution coordinated operation control method described above can be referred to each other. Optionally, referencing Figure 2 , Figure 2 This is a schematic diagram of the structure of the power transmission and distribution coordinated operation control device provided by the present invention. The power transmission and distribution coordinated operation control device includes: The load-bearing mapping module 210 is used to perform a safety boundary scan of the transmission side based on the power grid operation status data of the transmission side, to obtain the power range that the transmission side is allowed to inject into the distribution side, and to perform load-bearing capacity mapping of the distribution side based on the power range and the voltage constraints of the internal nodes of the distribution side, to obtain the power range that can be shut down.

[0150] The power contract module 220 is used to perform overlapping matching based on the power range and power interval of the power supply to obtain the target power range of power transmission and distribution, and to perform demand analysis on the power supply side based on the target power range and the bus voltage deviation on the power transmission side to obtain the expected power supply sent from the power transmission side to the power distribution side.

[0151] The feasibility analysis module 230 is used to perform feasibility analysis on the distribution side based on the expected threshold power and the target power range, so as to obtain the target threshold power actually executed on the distribution side.

[0152] The coordinated voltage regulation module 240 is used to eliminate voltage deviation based on the target gate power and the operating status of the compensation equipment inside the distribution side, so as to obtain the coordinated voltage regulation result that restores the voltage of each node on the distribution side to the qualified range.

[0153] The embodiments of the present invention supplement the missing interactive confirmation mechanism for the safety constraints of power flow at the control point in the traditional control mode through a collaborative process of hierarchical verification, bidirectional matching, and closed-loop correction. This effectively avoids the risk of grid oscillation and protection maloperation caused by the conflict between the regulation actions on both sides of the power transmission and distribution under extreme operating conditions, and ensures the voltage control safety and collaborative stability of the power transmission and distribution network in the dynamic interaction process.

[0154] Please see Figure 3 , Figure 3 An embodiment diagram of an electronic device provided in accordance with the present invention. For example... Figure 3As shown, an embodiment of the present invention provides an electronic device 300, including a memory 310, a processor 320, and a computer program 311 stored in the memory 310 and executable on the processor 320. When the processor 320 executes the computer program 311, it implements the processes of steps 10 to 40.

[0155] Please see Figure 4 , Figure 4 An embodiment diagram of a computer-readable storage medium provided in accordance with an embodiment of the present invention is shown. Figure 4 As shown, this embodiment provides a computer-readable storage medium 400 on which a computer program 311 is stored. When the computer program 311 is executed by a processor, it implements the processes of steps 10 to 40.

[0156] On the other hand, the present invention also provides a computer program product, which includes a computer program that can be stored on a non-transitory computer-readable storage medium. When the computer program is executed by a processor, the computer can execute the power transmission and distribution coordinated operation control method provided by the above methods, which includes the process of steps 10 to 40.

Claims

1. A method for coordinated operation control of power transmission and distribution, characterized in that, include: Based on the power grid operation status data on the transmission side, a safety boundary scan is performed on the transmission side to obtain the power range at which the transmission side is allowed to inject into the distribution side. Based on the power range at which the transmission side is allowed to inject into the distribution side and the voltage constraints of the internal nodes on the distribution side, the carrying capacity of the distribution side is mapped to obtain the range of power that can be shut down. Based on the overlap matching of the shut-in power range and the shut-in power interval, the target power interval for power transmission and distribution is obtained. Based on the target power interval and the bus voltage deviation of the transmission side, the demand analysis of the transmission side is performed to obtain the expected shut-in power sent from the transmission side to the distribution side. Based on the expected threshold power and the target power range, a feasibility analysis is performed on the distribution side to obtain the target threshold power actually executed on the distribution side. Voltage deviations are eliminated based on the target gate power and the operating status of the compensation equipment inside the distribution side, resulting in coordinated voltage regulation that restores the voltage of each node on the distribution side to within the acceptable range.

2. The power transmission and distribution coordinated operation control method according to claim 1, characterized in that, The steps for obtaining the coordinated voltage regulation results of restoring the voltage of each node on the distribution side to the qualified range include: Based on the target gate power, the network topology on the distribution side, the output data of distributed power sources, the load data, and the switching status data of the compensation equipment, power flow calculation is performed to obtain the voltage amplitude of each node. Nodes with voltage amplitudes below the lower limit of the acceptable voltage range are designated as undervoltage nodes, and nodes with voltage amplitudes above the upper limit of the acceptable voltage range are designated as overvoltage nodes. If the undervoltage node and overvoltage node are empty, then the target gate power and the current switching position data of the internal compensation equipment on the distribution side are determined as the coordinated voltage regulation result. If the undervoltage and overvoltage nodes are not empty, then for each undervoltage node, the compensation device with the smallest electrical connection path impedance and whose current switching position is less than the maximum allowable position is retrieved to obtain the candidate device for voltage boosting; for each overvoltage node, the compensation device with the smallest electrical connection path impedance and whose current switching position is greater than the minimum allowable position is retrieved to obtain the candidate device for voltage reduction; voltage deviation elimination is performed based on the candidate devices for voltage boosting and the candidate devices for voltage reduction to obtain the coordinated voltage regulation result.

3. The power transmission and distribution coordinated operation control method according to claim 2, characterized in that, The step of eliminating voltage deviations based on the candidate devices for voltage boosting and the candidate devices for voltage bucking to obtain the coordinated voltage regulation result includes: Conflict detection is performed on the candidate devices to be boosted and the candidate devices to be bucked. If the same compensation device exists in the candidate devices to be boosted and the candidate devices to be bucked, the absolute values ​​of the voltage deviations of their associated nodes are compared. The operating direction corresponding to the one with the larger absolute value of the voltage deviation is retained, and the other operating direction is eliminated to obtain the target boosting device and the target bucking device. Based on the target gear setting of each target boosting device being set to the current switching gear plus one step, a boosting command is generated; based on the target gear setting of each target bucking device being set to the current switching gear minus one step, a bucking command is generated, resulting in a comprehensive adjustment command. If the comprehensive adjustment command is empty, then the target gate power and the current switching position data of the internal compensation equipment on the distribution side are determined as the coordinated voltage regulation result; If the integrated adjustment command is not empty, the switching position data of the internal compensation equipment on the distribution side is updated based on the integrated adjustment command, and the current adjustment cycle is recorded; if the current adjustment cycle is less than the maximum allowable adjustment cycle, the power flow calculation process is restarted; if the current adjustment cycle is equal to the maximum allowable adjustment cycle, the target threshold power and the updated switching position data of the internal compensation equipment on the distribution side are determined as the coordinated voltage regulation result.

4. The power transmission and distribution coordinated operation control method according to claim 1, characterized in that, The steps for obtaining the desired gate power sent from the transmission side to the distribution side include: If the expected threshold power is less than the lower boundary value of the target power range, then the lower boundary value is determined as the reference threshold power; if the expected threshold power is greater than the upper boundary value of the target power range, then the upper boundary value is determined as the reference threshold power; if the expected threshold power is within the target power range, then the expected threshold power is determined as the reference threshold power. Power flow calculations are performed based on the reference gate power, distributed power output data, load demand data, and network topology on the distribution side to obtain voltage distribution data for each node and current distribution data for each branch. Nodes whose voltage distribution data exceeds the acceptable voltage range on the distribution side are identified as over-limit nodes, and branches whose current distribution data exceeds the current carrying capacity of the distribution side are identified as overloaded branches, thus determining the constraint violation set. If the constraint violation set is empty, the target power range is determined as the power search range; if the constraint violation set is not empty, starting from the reference gate power, a step search is performed in the power decreasing direction and the power increasing direction respectively, until the constraint violation set corresponding to the searched power point is empty, and the power search range is determined based on the minimum power value and the maximum power value that satisfy the safety constraints. Based on the power search range and the target power range, a demand analysis is performed on the transmission side to obtain the expected threshold power sent from the transmission side to the distribution side.

5. The power transmission and distribution coordinated operation control method according to claim 4, characterized in that, The step of performing transmission-side demand analysis based on the power search interval and the target power interval to obtain the expected gate power sent from the transmission side to the distribution side includes: The physical safety power range on the distribution side is obtained by overlapping and truncation of the power search range and the target power range, and the common feasible power is determined based on the common part of the physical safety power range and the target power range. If the common feasible power is empty, the distance between the two boundary values ​​of the target power range and the physical safety power range of the distribution side is calculated, and the boundary value with the closest distance is selected as the final feasible power; if the common feasible power is not empty, the common feasible power is used as the final feasible power. Calculate the absolute value of the difference between the final feasible power and the reference threshold power, and select the power value with the smallest absolute value of the difference to determine the pre-selected execution power; Based on the reactive power balance demand on the distribution side corresponding to the pre-selected execution power and the physical adjustment limit range of the reactive power compensation equipment on the distribution side; if the reactive power balance demand is within the physical adjustment limit range, then the pre-selected execution power is determined as the target cut-off power actually executed on the distribution side; if the reactive power balance demand exceeds the physical adjustment limit range, then the boundary value with the smallest absolute value of active power in the target power range is determined as the target cut-off power actually executed on the distribution side.

6. The power transmission and distribution coordinated operation control method according to claim 1, characterized in that, The steps to obtain the shut-off power range include: Using the upper and lower limits of the power range of the gate as the carrying capacity mapping input boundary, the basic state power flow calculation is performed on the distribution side to obtain the basic state voltage amplitude sequence of each node on the distribution side; The voltage amplitude sequence of each node on the distribution side is compared point by point with the voltage constraints of the internal nodes on the distribution side to screen out nodes that exceed the voltage constraints as voltage over-limit nodes. Based on the analysis of the topological connection relationship on the distribution side and the existence of direct electrical connection path branches for voltage over-limit nodes, sensitive electrical branches are obtained. Based on the sensitive electrical branches and the ground state voltage amplitude sequence of each node on the distribution side, the voltage response gradient of each sensitive electrical branch to the gate power is generated. The upper and lower limits of power are converged based on the voltage response gradient of each sensitive electrical branch to obtain the shut-off power range.

7. The power transmission and distribution coordinated operation control method according to claim 6, characterized in that, The method of convergence of upper and lower power limits based on the voltage response gradients of each sensitive electrical branch to obtain the shut-off power range includes: The gradient sorting sequence is obtained by arranging the voltage response gradients of each sensitive electrical branch according to their magnitude; Based on the voltage response gradient corresponding to the first element in the gradient sorting sequence, the ground state voltage amplitude of the corresponding node in the voltage over-limit node, and the voltage constraints of the internal nodes on the distribution side, the power change amount that makes the voltage of the corresponding node return to the voltage constraints of the internal nodes on the distribution side is determined. The power upper and lower limits in the load capacity mapping input boundary are updated based on the power change, and the above steps are performed with the updated power upper limit as the new load capacity mapping input edge until there are no voltage over-limit nodes, and the final converged power upper and lower limits are output. The gate-closable power range is determined based on the upper and lower limits of the final convergence power.

8. A power transmission and distribution coordinated operation control device, characterized in that, For implementing the power transmission and distribution coordinated operation control method as described in any one of claims 1 to 7; the apparatus includes: The load-bearing mapping module is used to perform a safety boundary scan of the transmission side based on the power grid operation status data of the transmission side, to obtain the power range that the transmission side is allowed to inject into the distribution side, and to perform load-bearing capacity mapping of the distribution side based on the power range and the voltage constraints of the internal nodes of the distribution side, so as to obtain the power range that can be shut down. The power contract module is used to perform overlapping matching based on the shut-in power range and the shut-in power interval to obtain the target power interval for power transmission and distribution, and to perform demand analysis on the transmission side based on the target power interval and the bus voltage deviation on the transmission side to obtain the expected shut-in power sent from the transmission side to the distribution side. The feasibility analysis module is used to perform a feasibility analysis on the distribution side based on the expected threshold power and the target power range, so as to obtain the target threshold power actually executed on the distribution side. The coordinated voltage regulation module is used to eliminate voltage deviation based on the target gate power and the operating status of the compensation equipment inside the distribution side, so as to obtain the coordinated voltage regulation result that restores the voltage of each node on the distribution side to the qualified range.

9. An electronic device, comprising: A memory for storing a computer program; a processor for reading and executing the computer program, characterized in that, when the processor executes the computer program, it implements the power transmission and distribution coordinated operation control method as described in any one of claims 1 to 7.

10. A non-transitory computer-readable storage medium storing a computer program, characterized in that, When the computer program is executed by the processor, it implements the power transmission and distribution coordinated operation control method as described in any one of claims 1 to 7.

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