Power balancing control system for distribution radio areas suitable for large-area irrigation season

Abstract

This application discloses a power balance control system for distribution substations suitable for large-area irrigation seasons, relating to the field of distribution network control technology. The system includes: an acquisition module for acquiring daily substandard power consumption and initial voltage drop data of target electrical equipment to be dispatched within the distribution substation; a search module for extracting the common line resistance value corresponding to electrical junction nodes; a calculation module for determining net voltage drop offset data based on the available supporting current of grid-connected power nodes and the common line resistance value; a generation module for iteratively optimizing the daily substandard power consumption and net voltage drop offset data using a preset knapsack algorithm to generate a target closing combination list; and a first issuing module for generating time-series coordinated control commands based on the target closing combination list. This application achieves the technical effect of avoiding dispatch congestion and excessively long waiting times for irrigation.

Description

Technical Field

[0001] This application relates to the field of power distribution network control technology, specifically to a power balance regulation system for power distribution substations suitable for large-area irrigation seasons. Background Technology

[0002] During the peak irrigation season in rural power grids, long-distance, small-diameter trunk lines are highly susceptible to transient voltage drops caused by the simultaneous operation of multiple large-capacity water pumps, leading to transformer undervoltage tripping. Current dispatching schemes employ a conservative, one-size-fits-all approach to prevent concurrent operation. Given the widespread adoption of distributed photovoltaic (PV) systems, the local support current output from PV inverters could potentially share the load current of the main lines, thus reducing voltage drop. However, existing technology only assesses the worst-case scenario without PV, resulting in a severe underestimation of the power grid's actual capacity and causing technical problems such as dispatching congestion and excessively long waiting times for irrigation. Summary of the Invention

[0003] To address the technical problem in related technologies that assess only the worst-case scenario without photovoltaic power, which leads to a serious underestimation of the actual capacity of the distribution network and causes scheduling blockages and excessively long waiting times for irrigation, this application provides a power balance control system for distribution areas suitable for large-area irrigation seasons.

[0004] The specific technical solution adopted is as follows:

[0005] The acquisition module is used to acquire the daily non-compliant power consumption and initial voltage drop data of the target electrical equipment to be dispatched within the distribution area;

[0006] The search module is used to search for electrical junctions between the target electrical equipment and the grid-connected power supply node and the transformer, and to extract the common line resistance value corresponding to the electrical junction.

[0007] The calculation module is used to calculate the voltage drop compensation data of the target electrical equipment based on the available support current of the grid-connected power node and the common line resistance value, and to determine the net voltage drop compensation data of the target electrical equipment based on the difference between the initial voltage drop data and the voltage drop compensation data.

[0008] The generation module is used to iteratively optimize the daily power consumption and net voltage drop offset data by using a preset knapsack algorithm to generate a list of target closing combinations.

[0009] The first issuing module is used to generate timing coordination control instructions based on the target closing combination list and issue them to each target electrical device to control each target electrical device to operate synchronously according to the set timing sequence.

[0010] In one possible implementation of this application, the acquisition module is specifically used for:

[0011] Obtain the target electrical equipment's daily rated power consumption and cumulative power consumption upon switching on;

[0012] The daily power consumption that fails to meet the standard is calculated based on the difference between the daily rated power consumption and the cumulative power consumption after closing the circuit.

[0013] In one possible implementation of this application, the acquisition module is further configured to:

[0014] Retrieve the measured minimum transient voltage value of the target electrical equipment from historical electricity consumption records, and obtain the rated operating voltage of the low-voltage side bus of the transformer;

[0015] The initial voltage drop data is based on the difference between the rated operating voltage and the measured lowest transient voltage value.

[0016] If the target electrical equipment has no historical electricity consumption records, the initial voltage drop data is calculated using preset parameters in the equipment parameter library.

[0017] In one possible implementation of this application, the search module is specifically used for:

[0018] Extract the network topology within the distribution transformer area, and extract the one-way path from the target electrical equipment and grid-connected power supply node to the root node on the low-voltage side of the transformer from the network topology;

[0019] Extract the first common parent node from the two unidirectional paths and mark the common parent node as an electrical junction node.

[0020] In one possible implementation of this application, the search module is further configured to:

[0021] If the electrical junction node is the root node on the low-voltage side of the transformer, then the target electrical equipment and the grid-connected power supply node do not share any line, and the resistance value of the shared line corresponding to the electrical junction node is set to zero.

[0022] If the electrical junction is not the root node on the low-voltage side of the transformer, extract the cable path from the root node on the low-voltage side of the transformer to the electrical junction.

[0023] The resistance value of the common line is calculated based on the line parameters of the cable path.

[0024] In one possible implementation of this application, the computing module is specifically used for:

[0025] Multiply the available support current of any grid-connected power node by the resistance value of the common line to obtain the single-point voltage drop compensation data of the target electrical equipment.

[0026] The voltage drop compensation data of each grid-connected power node is summed to obtain the voltage drop compensation data of the target electrical equipment.

[0027] In one possible implementation of this application, the generation module includes:

[0028] The acquisition submodule is used to acquire the undervoltage trip setting of the transformer main circuit relay protection device, as well as the real-time operating voltage of the low-voltage side bus.

[0029] The calculation submodule is used to calculate the bus undervoltage trip margin based on the voltage difference between the real-time operating voltage and the undervoltage trip setting.

[0030] The generation submodule is used to calculate and process the bus undervoltage trip margin, daily non-compliant power consumption, and net voltage drop offset data using a preset knapsack algorithm, and generate a list of target closing combinations.

[0031] In one possible implementation of this application, a submodule is generated, specifically for:

[0032] The sum of the net voltage drop offset data of each target electrical equipment is not greater than the bus undervoltage trip margin, which is taken as a rigid boundary condition.

[0033] Under rigid boundary conditions, the device index sequence combination when the sum of the daily non-compliant power consumption reaches the maximum value is searched by a preset knapsack algorithm, and the device index sequence combination is used as the target closing combination list.

[0034] In one possible implementation of this application, the first distributing module is specifically used for:

[0035] The current time is superimposed with the preset safe communication buffer duration to obtain the marked execution time point;

[0036] The system sends timing coordination control commands with execution time points marked on them to each target electrical device via the control bus.

[0037] In one possible implementation of this application, the system further includes a second distribution module, which is specifically used for:

[0038] A forced disconnection command is issued to electrical equipment not included in the target closing combination list to cut off the secondary circuit generated by manually pressing the closing button.

[0039] This application has, but is not limited to, the following technical effects:

[0040] In this application, voltage drop compensation data of target electrical equipment is calculated based on the available support current of grid-connected power nodes and the resistance value of shared lines. This quantifies the local voltage drop compensation effect of distributed power sources on specific line segments. By using a pre-set knapsack algorithm, combined with daily non-compliant power consumption and net voltage drop compensation data, the multi-machine concurrent nonlinear transient voltage drop process, which is difficult to linearly superimpose, is transformed into a discretized combinatorial optimization problem with rigid capacity constraints. This generates the required target closing combination list, and then sends coordinated control commands to each target electrical equipment in the target closing combination list to avoid scheduling blockage and excessively long queuing waiting times. Attached Figure Description

[0041] Figure 1 This is a schematic diagram of the system architecture of the power balance control system for distribution radio stations applicable to large-area irrigation seasons in this application;

[0042] Figure 2 This is a schematic diagram of the overall method and process involved in the power balance control system for distribution radio stations applicable to large-area irrigation seasons, as described in this application. Detailed Implementation

[0043] It should be understood that the specific embodiments described herein are merely illustrative of this application and are not intended to limit this application.

[0044] This application provides a power balance control system for distribution transformer substations suitable for large-area irrigation seasons. In the first embodiment of this application's power balance control system for distribution transformer substations suitable for large-area irrigation seasons, refer to... Figure 1 and Figure 2 ,include:

[0045] The acquisition module 101 is used to acquire the daily non-compliant power consumption and initial voltage drop data of the target electrical equipment to be dispatched within the distribution area.

[0046] As an example, the target power-consuming equipment can be a well (hereinafter referred to as a well node). During farmland irrigation, there may be multiple target wells consuming power. In the initial stage, the system establishes a total of... The target well nodes and the total number are The topology tree matrix of the grid-connected photovoltaic inverter nodes (i.e., grid-connected power supply nodes) is established. After establishing this topology tree matrix, the system sets the index for cyclic traversal of the well nodes as denoted as . (in, ), and let the index for iterating through the photovoltaic inverter nodes be denoted as (in, ).

[0047] As an example, to ensure all measured parameters are on the same electrical plane, the system broadcasts a timestamped time synchronization command message to all node terminals within the network, including circuit breakers and inverters, via the distribution area's downlink communication bus. Upon receiving the time synchronization command message, each node terminal sets the timestamp of the specified future time within the message as the unified time reference. The system then strictly aligns all subsequent voltage, current, and electrical parameter acquisition actions to the absolute time cross-section corresponding to this unified time reference.

[0048] As an example, the daily power consumption that fails to meet the standard is calculated by subtracting the power consumption already used from the rated power consumption. The larger this value is, the higher the urgency for the well to be shut down.

[0049] As an example, the initial voltage drop data can be the transient voltage drop caused to the grid by the device at the moment of closing, representing the baseline impact of the water pump starting on the line without photovoltaic assistance.

[0050] Specifically, the acquisition module 101 is used for:

[0051] Obtain the daily rated power consumption and cumulative power consumption of the target electrical equipment.

[0052] The daily power consumption that fails to meet the standard is calculated based on the difference between the daily rated power consumption and the cumulative power consumption after closing the circuit.

[0053] As an example, taking the i-th well node as an example, the system extracts the... Each well node corresponds to the rated operating power on the pump nameplate, and the system retrieves the preset maximum permissible irrigation duration per day from the local configuration database. This duration is a fixed value set according to the irrigation and drainage guidelines published by the local agricultural department (specifically, 10 hours in this embodiment). The system multiplies the rated operating power by the maximum permissible irrigation duration per day to obtain the rated daily power consumption of that well node. .

[0054] Furthermore, accessing the first via the communication bus The intelligent circuit breaker at each well node reads the cumulative closed-circuit power consumption recorded under the unified time base for the current natural day. The daily rated power consumption Subtract the cumulative power consumption for closing the circuit breaker , obtained the Daily power consumption of individual well nodes that did not meet standards .

[0055] Furthermore, the system also needs to track daily power consumption that fails to meet the target. Perform non-negative boundary condition check:

[0056] Specifically, when the daily power consumption that did not meet the target is detected... This indicates that the irrigation task for the farmland where the well is located has been met or exceeded for the day. The system immediately updates the data. Each well node is removed from the target well node sequence in the current polling cycle and is not included in the subsequent pressure drop analysis and combination solution steps.

[0057] When the daily power consumption that did not meet the target was detected When that time comes, the system will set that value as the first... The value of each well node is determined by its acquisition value. The larger the value, the heavier the water supply task that the well has not yet completed, and the higher the urgency of closing the gate.

[0058] The acquisition module 101 is also used for:

[0059] Retrieve the measured minimum transient voltage value of the target electrical equipment from historical electricity consumption records, and obtain the rated operating voltage of the low-voltage side bus of the transformer.

[0060] The initial voltage drop data is based on the difference between the rated operating voltage and the measured lowest transient voltage value.

[0061] As an example, a water pump motor draws several times the rated current at the moment of starting, causing an instantaneous voltage drop in the line. The system needs to extract the initial impact amplitude of the water pump on the transformer without any distributed photovoltaic assistance, and based on this, calculate the initial voltage drop data.

[0062] As an example, firstly, the system accesses the... The non-volatile memory inside the intelligent circuit breaker at each well node is used to determine whether there are records of electrical parameters for historical closing and starting.

[0063] If historical electricity consumption records exist, the system directly extracts the measured minimum transient voltage value recorded at the moment of the most recent circuit breaker start-up. The system then calls the rated operating voltage of the low-voltage side bus of the transformer substation, subtracts the measured minimum transient voltage value from this rated operating voltage, and assigns the resulting voltage difference value to the initial voltage drop data. .

[0064] If the target electrical equipment has no historical electricity consumption records, the initial voltage drop data is calculated using preset parameters in the equipment parameter library.

[0065] As an example, if it is determined that there are no historical parameter records in the memory (such as in the case of building a new well or replacing the control board), the system triggers a voltage drop prediction process for the state without historical records. Specifically:

[0066] The system retrieves the static structure ledger and extracts data from the low-voltage side busbar of the transformer to the... The system then calculates the total resistance of the cables on the branch where each well node is located. Subsequently, the system extracts the preset reactive power compensation empirical constant corresponding to that cable model from the equipment parameter database. (Used to equivalently characterize the impedance amplification effect caused by inductive reactance during induction motor startup), and the total resistance of the cable is compared with the empirical constant for reactive power compensation. Multiplying these values ​​yields the overall impedance characteristic value of the line.

[0067] Furthermore, the system extracts the rated starting current marked on the pump's nameplate. To eliminate interference from background load on the line voltage, it further extracts the pre-recorded operating condition conversion factor (in this embodiment, the value is 0.82; the standard range is 0.80 to 0.85). The system combines the comprehensive impedance characteristic value, rated starting current, and operating condition conversion factor, and substitutes them into the following formula to calculate the initial voltage drop data. :

[0068]

[0069] in, Indicates the total resistance of the cable; This represents the empirical constant for reactive power compensation; The combined term represents the overall impedance characteristic value of the line for a large inductive starting current; This indicates the rated starting current of the water pump; This indicates the conversion factor for the operating conditions.

[0070] As can be seen from the formula, the larger the characteristic value of the cable impedance and the larger the rated starting current of the water pump, the higher the initial voltage drop of the output. This value objectively characterizes the baseline impact amplitude of a single water pump start-up on the power distribution line under operating conditions without external photovoltaic current support.

[0071] The search module 102 is used to search for electrical junctions between the target electrical equipment and the grid-connected power supply node and the transformer, and to extract the common line resistance value corresponding to the electrical junction.

[0072] As an example, an electrical junction node represents the first shared parent node in the transformer substation topology tree that connects any grid-connected power supply node (grid-connected photovoltaic inverter node, hereinafter referred to as photovoltaic inverter node) and well node to the transformer. The shared line resistance value is the cable impedance extending from the low-voltage side of the transformer to the aforementioned electrical junction node.

[0073] As an example, the system performs nested loop calculations within this module. By retrieving the actual electrical junction locations of photovoltaic nodes and well nodes, it extracts the shared trunk line resistance and combines it with the photovoltaic safety support current to quantify the photovoltaic's effect on voltage drop offsetting. Finally, it outputs the offsetting net voltage drop for scheduling.

[0074] Specifically, the search module 102 is used for:

[0075] Extract the network topology within the distribution transformer area, and extract the one-way path from the target electrical equipment and grid-connected power supply node to the low-voltage root node of the transformer.

[0076] Extract the first common parent node from the two unidirectional paths and mark the common parent node as an electrical junction node.

[0077] As an example, in a directed acyclic tree topology of a farmland power distribution network with a single power source radiating outwards, the current output from the photovoltaic inverter must flow along specific feeder branches to the main line, and can only converge with the current output from the transformer on specific main line sections. Only in shared segments where physical current convergence occurs can the photovoltaic current effectively share the power supply burden of the transformer. Therefore, the system uses a graph theory topology backtracking algorithm to accurately locate the convergence point of multi-source currents and extract the shared line resistance value of that cable segment.

[0078] Specifically, in practice, the system first extracts the first [item name] from each target electrical device. Each well node. Regarding this first... For each well node, the system initiates an internal horizontal traversal of the grid-connected photovoltaic inverter to extract the first... One photovoltaic inverter node.

[0079] Extracting the well node index With photovoltaic inverter node index Subsequently, the system inputs both indexes into a pre-defined algorithm program for retrieving overlapping nodes in the topology path. This program traces the unidirectional paths from the bottom-level nodes upwards through the aforementioned transformer substation topology tree matrix, layer by layer, towards the root node on the low-voltage side of the transformer. During the tracing process, the program horizontally compares the constituent nodes of these two paths to find the first common parent node closest to these two bottom-level nodes. After finding the first common parent node, the program outputs this node and marks it as an electrical junction node. The method for extracting electrical junction nodes between other well nodes and photovoltaic inverter nodes is similar and will not be elaborated here.

[0080] The search module 102 is also used for:

[0081] If the electrical junction node is the root node on the low-voltage side of the transformer, then the target electrical equipment and the grid-connected power supply node do not share any lines, and the resistance value of the shared line corresponding to the electrical junction node is set to zero.

[0082] As an example, establishing electrical junction nodes Subsequently, the system must handle the extreme topology boundary case where the photovoltaic system and the well are on completely independent feeder branches. The system must address this electrical junction node. Perform boundary determination and verification:

[0083] When the retrieved electrical junction nodes When it is the root node on the low-voltage side of the transformer (the root node on the low-voltage side of the transformer refers to the low-voltage side busbar of the distribution transformer), it indicates that the first... The well node and the first If a photovoltaic inverter node does not share any trunk line section in the distribution line, the system determines that there is no carrier between them that can generate a voltage drop to offset the physical effect. The system directly assigns the shared line resistance value for this combination. The value is set to zero so that this particular photovoltaic inverter does not generate any offset voltage drop in subsequent calculations.

[0084] If the electrical junction node is not the root node on the low-voltage side of the transformer, extract the cable path from the root node on the low-voltage side of the transformer to the electrical junction node.

[0085] The resistance value of the common line is calculated based on the line parameters of the cable path.

[0086] As an example, when the retrieved electrical junction node When it is not the root node on the low-voltage side of the transformer, it indicates that there is a real physical cable intersection between the two. The system extracts the electrical intersection node extending from the root node on the low-voltage side of the transformer in the transformer substation topology tree matrix. The system retrieves the cable path from the static equipment ledger, extracts the cross-sectional area, material resistivity, and total length parameters corresponding to the cable path, and calculates the common line resistance value corresponding to this combination using the standard cable impedance formula. The larger this value, the longer and thinner the common trunk line where current convergence occurs, and the more significant the share of voltage drop loss that the photovoltaic current can share for the transformer after being injected into the node.

[0087] As an example, the resistance value of the common line is calculated based on the line parameters of the cable path. The method can be:

[0088]

[0089] in, The resistivity of the material of the shared cable segment is represented by L, the total length of the cable extending from the low-voltage root node of the transformer to the electrical junction node is represented by S, and the cross-sectional area parameter of the shared cable segment is represented by S.

[0090] The calculation module 103 is used to calculate the voltage drop compensation data of the target electrical equipment based on the available support current of the grid-connected power node and the common line resistance value, and to determine the net voltage drop compensation data of the target electrical equipment based on the difference between the initial voltage drop data and the voltage drop compensation data.

[0091] As an example, pressure drop offset data represents the total pressure drop support that all legal photovoltaic devices in the distribution area can provide for a specific well, while net pressure drop offset data represents the pressure drop offset value generated by subtracting the total offset pressure drop from the initial pressure drop data.

[0092] Specifically, the calculation module 103 is used for:

[0093] Multiply the available support current of any grid-connected power node by the resistance value of the common line to obtain the single-point voltage drop compensation data of the target electrical equipment.

[0094] As an example, regarding the above-mentioned first... The system reads the factory-set hardware overcurrent protection threshold of the internal inverter module of each photovoltaic inverter node via the communication bus. The system synchronously collects data from this node. The real-time output current of each photovoltaic inverter node is calculated by subtracting the real-time output current from the hardware overcurrent protection threshold, thus determining the initial usable transient current. This value represents the remaining potential for the inverter to operate at its maximum capacity.

[0095] Subsequently, the system retrieves the static device ledger and extracts the first... The system determines the absolute thermal stability current carrying capacity limit of the bus branch conductor where each photovoltaic inverter node is located. The system simultaneously acquires the real-time background current carried by this bus branch conductor. The system subtracts the real-time background current carried by the thermal stability current carrying capacity limit from the actual thermal stability current carrying capacity limit to calculate the conductor's thermal stability residual current carrying capacity margin. This value represents the maximum allowable incremental transient current that can be injected into the cable without it overheating and melting.

[0096] After calculating the two parameters characterizing the incremental boundary, the system will use the initial available transient current and the conductor thermal stability residual current margin. The comparator program module filters out the smaller of the two values. After selecting the smaller value, the system calls a preset local overvoltage constraint model to determine whether the smaller value, when instantaneously injected into the grid, would cause the photovoltaic grid-connected voltage to touch the inverter's overvoltage disconnection protection setting. If it is confirmed that the local grid-connected overvoltage protection threshold is not triggered, the system finally outputs the smaller value and labels it as the [number missing]. The available support current for each photovoltaic inverter node during this polling cycle .

[0097] Furthermore, when it is predicted that the injected transient current of this relatively small value will trigger the local grid-connected point overvoltage protection threshold, the system forcibly adjusts the available support current of the j-th photovoltaic inverter node during this polling cycle. The value is assigned to zero.

[0098] As an example, with the first The photovoltaic node and the first Taking a single well node as an example, single-point pressure drop offset data The calculation method can be:

[0099]

[0100] in, Indicates the first Available supporting current for each photovoltaic inverter node; The common line resistance value represents the cable path; the single-point voltage drop offset data accurately characterizes the actual voltage loss that a specific distributed photovoltaic device can offset for the well pump on a specific common trunk line under limited conditions.

[0101] The voltage drop compensation data of each grid-connected power node is summed to obtain the voltage drop compensation data of the target electrical equipment.

[0102] As an example, after calculating the single-point voltage drop cancellation data for a single photovoltaic inverter node, the single-point voltage drop cancellation data for other photovoltaic inverter nodes are calculated similarly. The single-point voltage drop cancellation data for each photovoltaic inverter node are then accumulated. After the accumulation is complete, the system obtains the result for the first... Total pressure drop offset data obtained by individual well nodes under the support of the entire photovoltaic cluster .

[0103] The steps for determining the net voltage drop offset data of the target electrical equipment based on the difference between the initial voltage drop data and the voltage drop offset data include:

[0104] Obtain voltage drop offset data Then, the system will display the initial pressure drop data. Data offset by pressure drop Subtracting the two values ​​yields the baseline voltage drop difference.

[0105] Considering that the actual voltage rise effect of the transformer busbar is limited to the voltage drop caused by the load start-up, in order to prevent the voltage drop difference from becoming negative (i.e., overcompensation and backflow), the system substitutes the reference voltage drop difference value and the value of zero into the maximum value comparison function for amplitude limiting:

[0106]

[0107] in, This indicates the net pressure drop offset data; This represents the initial pressure drop data; This indicates the data for offsetting pressure drop. The combined term represents the baseline voltage drop difference after deducting the photovoltaic cluster assistance; The function ensures that the output is always not less than zero.

[0108] As can be seen from the formula, given a fixed initial voltage drop assessment value, the greater the total voltage drop offset provided by the photovoltaic cluster, the greater the output net voltage drop offset data. The smaller the value, the better. The system will calculate the result. The weight of the discrete scheduling feature is calibrated to reflect the impact characteristics of a single start-up of the well. The larger the weight value, the higher the risk of the bus voltage exceeding the limit caused by the closing impact of the water pump after comprehensive photovoltaic compensation.

[0109] The generation module 104 is used to iteratively optimize the daily power consumption and net voltage drop offset data by using a preset knapsack algorithm to generate a list of target closing combinations.

[0110] As an example, the pre-defined knapsack algorithm can be a combinatorial optimization algorithm. It sets a capacity limit and provides multiple items with weight and value. The algorithm selects the combination of items with the highest total value, provided the total weight does not exceed the capacity limit. In this embodiment, the well is the item, and its state is either selected or not selected. The capacity limit is the bus undervoltage trip margin, the item weight is the net voltage drop compensation data of the well, and the item value is the daily power consumption that did not meet the standard. The solution yields the list of the highest optimal closing combinations that do not exceed the limits.

[0111] The generation module 104 includes:

[0112] The acquisition submodule is used to acquire the undervoltage trip setting of the transformer main circuit relay protection device, as well as the real-time operating voltage of the low-voltage side bus.

[0113] The calculation submodule is used to calculate the bus undervoltage trip margin based on the voltage difference between the real-time operating voltage and the undervoltage trip setting.

[0114] As an example, the system collects the real-time operating voltage of the low-voltage side busbar through the voltage transformer at the transformer substation terminal, and then reads the undervoltage trip setting value stored in the transformer main circuit relay protection device. The system subtracts the undervoltage trip setting value from the real-time operating voltage to obtain the initial voltage difference. Further, the system substitutes the initial voltage difference into a preset maximum value comparison function (compared to zero) to obtain a busbar undervoltage trip margin that is not less than zero. . This represents the current transformer's ability to withstand the downward impact caused by the simultaneous closing of multiple water pumps. The larger the value, the lighter the base load and the more water pumps that can be closed concurrently.

[0115] As an example, after obtaining the bus undervoltage trip margin, the system... Perform boundary locking verification:

[0116] When detected When this occurs, it indicates that the current power grid is extremely overloaded and the bus voltage is on the verge of tripping. The system immediately suspends all optimization calculations for the current round and blocks the execution of closing commands for all wells in the entire distribution area until the margin is detected to be greater than zero in the next polling cycle, at which point the combined solution can be reactivated. When this happens, the system sets this value as the maximum total capacity that cannot be exceeded in subsequent 0-1 knapsack solvers.

[0117] Furthermore, it is necessary to determine whether the net pressure drop offset data is 0. If it is 0, the well is directly added to the unconditional closing whitelist and is no longer included in the knapsack algorithm as an item. For parameters greater than 0, the net pressure drop offset data and the bus undervoltage trip margin are multiplied by a preset proportional quantization factor (e.g., 1000) and rounded down to convert them into integer data, which are then set as the backpack's consumed weight and total capacity limit, respectively.

[0118] The generation submodule is used to calculate and process the bus undervoltage trip margin, daily non-compliant power consumption, and net voltage drop offset data using a preset knapsack algorithm, and generate a list of target closing combinations.

[0119] The generation submodule is specifically used for:

[0120] The sum of the net voltage drop offset data of each target electrical device is not greater than the bus undervoltage trip margin, which is taken as a rigid boundary condition.

[0121] Under rigid boundary conditions, the device index sequence combination when the sum of the daily non-compliant power consumption reaches the maximum value is searched by a preset knapsack algorithm, and the device index sequence combination is used as the target closing combination list.

[0122] Specifically, the system calls a 0-1 knapsack algorithm solver known in the art to map qualified well nodes in the closing request sequence to a set of items to be put into the knapsack.

[0123] Among them, the daily power consumption that did not meet the standard Let it be the first The acquisition value of each item; data to offset net pressure drop. Let it be the first The consumed weight of each item; the undervoltage trip margin of the busbar. Set as the maximum total capacity of the backpack.

[0124] After completing the variable mapping, the 0-1 knapsack algorithm solver performs dynamic programming iterations by constructing a two-dimensional state transition equation. During algorithm execution, the solver uses the net pressure drop of all well nodes selected in the combination to offset the data. The independent cumulative sum must not exceed the bus undervoltage trip margin. Given rigid boundary conditions, search within a broad combinatorial space for the amount of electricity that would cause a single day's consumption to fall short of the target. The combination of well index sequences that accumulates to the maximum value is used as the target closing combination list.

[0125] The first issuing module 105 is used to generate timing coordination control instructions based on the target closing combination list and issue them to each target electrical equipment to control each target electrical equipment to operate synchronously according to the set timing sequence.

[0126] As an example, due to the wide distribution of nodes in the distribution transformer area, inconsistent delays occur when commands are sent to different smart terminals along the communication bus. To ensure precise timing synchronization between the photovoltaic support current and the water pump starting current on the shared main line, the system must employ a unified clock synchronization triggering mechanism, rather than directly issuing instantaneous pulse signals. Therefore, timing-coordinated control commands are generated and sent to each target electrical device.

[0127] The first distributing module 105 is specifically used for:

[0128] The current time is superimposed with the preset safe communication buffer duration to obtain the marked execution time point.

[0129] The system sends timing coordination control commands with execution time points marked on them to each target electrical device via the control bus.

[0130] As an example, the system first extracts the target closing combination list. After obtaining the list, the system calculates and generates a specific marked execution time point (i.e., a unified execution timestamp) based on the current time, plus a preset safe communication buffer period (such as 2 to 5 seconds, to ensure that all terminals in the network can completely receive and parse data packets).

[0131] After generating the marked execution time point, the system sends an electronic closing pulse command (i.e., a timing coordination control command) with the marked execution time point to the corresponding smart circuit breaker of the selected well nodes in the list via the control bus. After receiving the command, the corresponding well node terminal temporarily stores it. When the local clock of the terminal is precisely aligned with the marked execution time point, it synchronously drives the main contacts of the internal circuit breaker to close, and officially connects the power supply circuit of the water pump.

[0132] The system also includes a second distribution module, which is specifically used for:

[0133] A forced disconnection command is issued to electrical equipment not included in the target closing combination list to cut off the secondary circuit generated by manually pressing the closing button.

[0134] As an example, while issuing the closing command, the system broadcasts a forced disconnect command to the mechanical tripping actuator inside the corresponding circuit breaker of the remaining well nodes that are in the requesting state but are not included in the target closing combination list. This forced disconnect command is used to cut off the electrical secondary circuit of the farmers manually pressing the closing button at the well site, so as to prevent the bus capacity from being illegally broken down due to human intervention by on-site personnel.

[0135] As an example, to implement voltage support using photovoltaic (PV) equipment, the system sends a power output control signal with the same future absolute time stamp to the PV inverters operating in the distribution substation area. This control signal includes a safe support current upper limit calculated independently for each inverter. Upon receiving this control signal, each inverter terminal also temporarily stores it and, at the instant its local clock reaches the future absolute time stamp, synchronously injects the corresponding active current into its respective grid-connected branch according to the safe support current upper limit. This synchronous injection ensures that the PV support current accurately flows into the shared main line at the moment the well is closed, achieving the expected concurrent voltage drop buffering effect.

[0136] After distributing and acknowledging all control commands, the system proactively clears the memory data cache involved in the current calculation cycle. The system then restarts time synchronization and prepares to enter the next polling scheduling window. At this point, the system has completed the control loop for a single source-load power balance regulation.

[0137] This application provides a power balance control system for distribution substations suitable for large-area irrigation seasons. In this application, the voltage drop compensation data of the target electrical equipment is calculated based on the available support current of the grid-connected power nodes and the resistance value of the shared line. This quantifies the local voltage drop compensation effect of distributed power sources on specific line segments. By using a preset knapsack algorithm, combined with the daily non-compliant power consumption and net voltage drop compensation data, the nonlinear transient voltage drop process of multiple machines that is difficult to linearly superimpose is transformed into a discretized combinatorial optimization problem with rigid capacity constraints. This generates the required target closing combination list, and then sends coordinated control commands to each target electrical equipment in the target closing combination list to avoid scheduling blockage and excessively long waiting times for irrigation.

[0138] It should be noted that, in this document, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or system that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or system. Unless otherwise specified, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or system that includes that element.

[0139] The sequence numbers of the embodiments in this application are for descriptive purposes only and do not represent the superiority or inferiority of the embodiments.

[0140] The above are merely preferred embodiments of this application and do not limit the scope of this application. Any equivalent structural or procedural transformations made based on the description and drawings of this application, or direct or indirect applications in other related technical fields, are similarly included within the scope of protection of this application.

Claims

1. A power balance control system for power distribution areas suitable for large-area irrigation seasons, characterized in that, The system includes: The acquisition module is used to acquire the daily non-compliant power consumption and initial voltage drop data of the target electrical equipment to be dispatched within the distribution area; The search module is used to search for the electrical junction nodes between the target electrical equipment and the grid-connected power supply node and the transformer, and to extract the common line resistance value corresponding to the electrical junction node. The calculation module is used to calculate the voltage drop offset data of the target electrical equipment based on the available support current of the grid-connected power node and the resistance value of the common line, and to determine the net voltage drop offset data of the target electrical equipment based on the difference between the initial voltage drop data and the voltage drop offset data. The generation module is used to iteratively optimize the daily power consumption that did not meet the target and the net voltage drop offset data through a preset knapsack algorithm to generate a list of target closing combinations. The first issuing module is used to generate a timing coordination control command based on the target closing combination list and issue it to each target electrical device to control each target electrical device to operate synchronously according to the set timing sequence.

2. The power balance control system for distribution network areas suitable for large-area irrigation season as described in claim 1, characterized in that, The acquisition module is specifically used for: Obtain the daily rated power consumption and cumulative power consumption of the target electrical equipment; The daily power consumption that fails to meet the standard is calculated based on the difference between the daily rated power consumption and the cumulative power consumption after closing the circuit.

3. The power balance control system for distribution network areas suitable for large-area irrigation season as described in claim 1, characterized in that, The acquisition module is also used for: Retrieve the measured minimum transient voltage value of the target electrical equipment from historical electricity consumption records, and obtain the rated operating voltage of the low-voltage side bus of the transformer; The initial voltage drop data is based on the difference between the rated operating voltage and the measured lowest transient voltage value. If the target electrical equipment has no historical electricity consumption records, the initial voltage drop data is calculated using preset parameters in the equipment parameter library.

4. The power balance control system for distribution network areas suitable for large-area irrigation season as described in claim 1, characterized in that, The search module is specifically used for: Extract the network topology within the distribution transformer area, and extract the one-way path from the target electrical equipment and grid-connected power supply node to the root node on the low-voltage side of the transformer from the network topology; Extract the first common parent node from the two unidirectional paths and mark the common parent node as an electrical junction node.

5. The power balance control system for distribution network areas suitable for large-area irrigation season as described in claim 1, characterized in that, The search module is also used for: If the electrical junction node is the root node on the low-voltage side of the transformer, then the target electrical equipment and the grid-connected power supply node do not share any line, and the resistance value of the shared line corresponding to the electrical junction node is set to zero. If the electrical junction node is not the root node on the low-voltage side of the transformer, extract the cable path from the root node on the low-voltage side of the transformer to the electrical junction node; The resistance value of the common line is calculated based on the line parameters of the cable path.

6. The power balance control system for distribution network areas suitable for large-area irrigation season as described in claim 1, characterized in that, The computing module is specifically used for: Multiply the available support current of any of the grid-connected power nodes by the resistance value of the common line to obtain the single-point voltage drop compensation data of the target electrical equipment; The voltage drop compensation data of each grid-connected power node is summed to obtain the voltage drop compensation data of the target electrical equipment.

7. The power balance control system for distribution network areas suitable for large-area irrigation season as described in claim 1, characterized in that, The generation module includes: The acquisition submodule is used to acquire the undervoltage trip setting of the transformer main circuit relay protection device, as well as the real-time operating voltage of the low-voltage side bus. The calculation submodule is used to calculate the bus undervoltage trip margin based on the voltage difference between the real-time operating voltage and the undervoltage trip setting. The generation submodule is used to calculate and process the bus undervoltage trip margin, the daily non-compliant power consumption, and the net voltage drop offset data using a preset knapsack algorithm, and generate a list of target closing combinations.

8. The power balance control system for distribution network areas suitable for large-area irrigation season as described in claim 7, characterized in that, The generation submodule is specifically used for: The sum of the net voltage drop offset data of each of the target electrical equipment is not greater than the bus undervoltage trip margin, which is taken as a rigid boundary condition. Under the rigid boundary conditions, the device index sequence combination when the sum of the daily non-compliant power consumption is at its maximum value is searched by a preset knapsack algorithm, and the device index sequence combination is used as the target closing combination list.

9. The power balance control system for distribution network areas suitable for large-area irrigation season as described in claim 1, characterized in that, The first sending module is specifically used for: The current time is superimposed with the preset safe communication buffer duration to obtain the marked execution time point; The system sends timing coordination control commands with execution time points marked on them to each target electrical device via the control bus.

10. The power balance control system for distribution network areas suitable for large-area irrigation season as described in claim 1, characterized in that, The system further includes a second distribution module, which is specifically used for: A forced disconnection command is issued to electrical equipment not included in the target closing combination list to cut off the secondary circuit generated by manually pressing the closing button.

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