Low-voltage distributed photovoltaic group regulation method and system based on transformer area fusion terminal

Abstract

The application relates to the technical field of low-voltage power distribution network operation control, and discloses a low-voltage distributed photovoltaic group regulation and control method and system based on a transformer area fusion terminal, which comprises the following steps: acquiring operation state data of a photovoltaic transformer area and a cooperative transformer area, performing time sequence correlation, and obtaining transformer area regulation and control data; identifying a target node and evaluating regulation demand according to the transformer area regulation and control data; querying an electrical correlation table according to the target node, determining regulation resources, evaluating resource support capacity, and obtaining resource support data; and screening candidate resources according to the resource support data and the regulation demand, performing control quantity distribution, and obtaining a regulation and control scheme. The method can realize matching between cooperative regulation resources and voltage regulation demand.

Description

Technical Field

[0001] This invention relates to the field of low-voltage distribution network operation and control technology, and in particular to a method and system for low-voltage distributed photovoltaic group dispatch and control based on a transformer substation fusion terminal. Background Technology

[0002] Currently, the number of distributed photovoltaic (PV) systems connected to low-voltage distribution networks is continuously increasing. PV power output fluctuates due to changes in the external environment, causing voltage spikes or drops in transformer substations within short periods. Transformer substations are typically equipped with regulating resources such as PV inverters and reactive power compensation devices. However, the resource capacity, operating status, and electrical interconnections vary between different substations, necessitating distributed control based on real-time operating conditions.

[0003] In a current technology, an upper-level dispatching device typically collects operational data from each distribution area and issues reactive power compensation or active power reduction commands based on the node voltage of the target distribution area. This control method requires steps such as uploading operational data, calculating control quantities, and returning control commands. When photovoltaic output changes rapidly, the control commands can easily lag behind changes in node voltage. To address this, some existing technologies employ edge-local control, where the distribution area fusion terminal collects operational data locally and directly generates control commands to shorten response time. However, this edge-local control method primarily relies on independent control based on the regulation resources of a single distribution area. When the available resources of the target distribution area are insufficient, there is a lack of collaborative regulation mechanisms with adjacent distribution areas, resulting in the inability to effectively alleviate voltage exceedance issues. Even when some solutions introduce cross-distribution area collaboration, they mainly allocate regulation tasks among distribution areas based on fixed allocation ratios or preset priorities. It is difficult to determine collaborative resources and corresponding control quantities based on the voltage support capacity of each regulation resource for the target node, leading to insufficient matching accuracy between regulation resources and voltage regulation requirements.

[0004] Existing technologies suffer from the problem that the coordinated regulation resources of low-voltage distributed photovoltaic power stations are difficult to accurately match with voltage regulation requirements. Summary of the Invention

[0005] This invention provides a method and system for group regulation and control of low-voltage distributed photovoltaic (PV) power distribution areas based on integrated distribution terminal, in order to solve the problem in the prior art that the coordinated regulation resources of low-voltage distributed PV power distribution areas are difficult to accurately match with voltage regulation requirements.

[0006] In a first aspect, to solve the above-mentioned technical problems, the present invention provides a method for low-voltage distributed photovoltaic group control based on a transformer substation fusion terminal, comprising: Obtain the operating status data of the photovoltaic power station area and the coordinated power station area, and perform time-series correlation on the operating status data to obtain the power station area control data; Voltage over-limit identification is performed based on the transformer area control data to obtain the target node, and demand assessment is performed based on the transformer area control data corresponding to the target node to obtain the regulation demand; The system queries a preset electrical association table based on the target node and the transformer area control data to obtain control resources and electrical association data. Based on the electrical association data and the transformer area control data, the system performs a support capability assessment to obtain resource support data. Based on the resource support data and the control requirements, the system adapts and filters the control resources to obtain a candidate resource set. Based on the regulation requirements and the candidate resource set, control quantities are allocated to obtain a regulation scheme.

[0007] Secondly, the present invention provides a low-voltage distributed photovoltaic group control system based on a transformer substation fusion terminal, comprising: a memory, a processor, and a computer program stored in the memory and executable on the processor, wherein the processor executes the program to implement the method described above.

[0008] Thirdly, the present invention provides a computer-readable storage medium having a computer program stored thereon, which, when executed by a processor, implements the method described above.

[0009] Compared with the prior art, the present invention has the following beneficial effects: (1) This invention obtains the operation status data of photovoltaic power stations and coordinated power stations, and performs time-series correlation on the operation status data to obtain power station control data, so that the operation records formed by different power stations and different control resources at different acquisition times can establish a corresponding relationship according to a unified time benchmark; on this basis, voltage over-limit identification and demand assessment are performed based on the power station control data to determine the target node that needs to implement voltage regulation and the corresponding regulation demand, so that the subsequent group control process can determine the regulation direction and regulation degree around the node where the voltage over-limit actually occurs, and reduce the control deviation caused by inconsistent data timing or unclear regulation object.

[0010] (2) This invention determines the regulating resources that have electrical relationships with the target node by querying the electrical association table based on the target node and the control data of the transformer area, and forms electrical association data by the transformer area affiliation, regulation type, voltage support coefficient and capacity boundary of the regulating resources; further, it determines the available regulating capacity by combining the real-time output and capacity boundary of each regulating resource, and forms resource support data based on the available regulating capacity and voltage support coefficient, so that the remaining regulating capacity of different types of regulating resources can be converted into voltage support capacity for the target node; then, it selects candidate resource sets according to the resource support direction, resource support margin and regulation requirements, so that the selected resources can provide effective support to the target node in the required regulation direction, and reduce the ineffective regulation caused by selecting collaborative resources based only on geographical location, rated capacity or single operating parameters.

[0011] (3) This invention allocates control quantities according to regulation demand and candidate resource set, determines the control quantities corresponding to each regulation resource, and generates regulation schemes, so that reactive power resources in the target area, reactive power resources in the collaborative area and photovoltaic active power regulation resources can participate in group regulation and control according to their respective available regulation capacity and voltage support capability. Since the control quantity allocation process is constrained by both regulation demand and actual resource support capability, it can avoid allocating excessive control tasks to resources with insufficient support capability and reduce the situation of directly reducing photovoltaic active power when reactive power regulation resources are still available, thereby improving the matching degree between collaborative regulation resources and voltage regulation demand and enhancing the collaborative voltage regulation capability of low-voltage distributed photovoltaic areas. Attached Figure Description

[0012] Figure 1 This is a schematic diagram of a low-voltage distributed photovoltaic group regulation and control method based on a transformer substation fusion terminal provided in the first embodiment of the present invention; Figure 2 This is a schematic diagram of the resource support margin ranking of the candidate resource set provided in the first embodiment of the present invention; Figure 3 This is a schematic diagram illustrating the change in remaining adjustment demand before and after the control quantity allocation provided in the first embodiment of the present invention. Detailed Implementation

[0013] 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.

[0014] Reference Figure 1 The first embodiment of the present invention provides a method for group control and regulation of low-voltage distributed photovoltaic systems based on integrated distribution terminal, comprising the following steps: S1, acquire the operating status data of the photovoltaic power station area and the coordinated power station area, and perform time-series correlation on the operating status data to obtain the power station area control data; S2, Based on the distribution area control data, voltage over-limit identification is performed to obtain the target node, and based on the distribution area control data corresponding to the target node, demand assessment is performed to obtain the regulation demand; S3. Based on the target node and the transformer area control data, query the preset electrical association table to obtain the control resources and electrical association data. Based on the electrical association data and the transformer area control data, perform a support capability assessment to obtain resource support data. Based on the resource support data and the control requirements, perform adaptation screening on the control resources to obtain a candidate resource set. S4. Based on the adjustment requirements and the candidate resource set, control quantities are allocated to obtain the adjustment scheme.

[0015] In step S1, the operating status data of the photovoltaic power station area and the coordinated power station area are obtained, and the operating status data is correlated in time series to obtain the power station area control data.

[0016] Specifically, time-series correlation is performed on the operating status data to obtain transformer area control data, including: The acquisition time, station area identifier, and device identifier are read from the operation status data. The operation status data is divided into time slices according to the preset associated time window to obtain status segments. Based on the transformer area identifier and the device identifier, the state segments within the same time slice are recorded and associated to obtain transformer area control data.

[0017] In one implementation, the photovoltaic (PV) distribution area is the area currently generated for voltage over-limit identification and control. The collaborative distribution area is the area that has a controllable power exchange path with the PV distribution area and can participate in coordinated control of regulatory resources based on the controllable power exchange path. Distribution areas that only have a data communication connection but lack a controllable power exchange path are not considered collaborative distribution areas in the current control cycle.

[0018] The operational status data is a collection of status records generated by the photovoltaic power station area and its collaborating power stations during operation. The power station integration terminal of the photovoltaic power station area collects the operational status data of its own area and receives the operational status data sent by the power station integration terminals of the collaborating power stations.

[0019] Each operational status record must include at least the acquisition time, the distribution area identifier, and the device identifier. The acquisition time indicates the moment when the corresponding status quantity is generated on the source device side; the distribution area identifier is used to determine whether the operational status record belongs to a photovoltaic distribution area or a collaborative distribution area; and the device identifier is used to determine the monitoring node or regulation resource corresponding to the operational status record.

[0020] Depending on the object being recorded, the operational status record also includes corresponding status fields. The operational status record for a monitoring node includes the node voltage; the operational status record for a regulating resource includes real-time active power output, real-time reactive power output, and equipment operating status; and the communication record generated by the substation fusion terminal includes the communication link status of the corresponding device or the corresponding collaborative substation.

[0021] Node voltage refers to the instantaneous voltage measurement value of the monitoring node at the corresponding acquisition time or the effective value of the corresponding sampling period. Real-time active power output and real-time reactive power output are the power state quantities of the regulating resources at the corresponding acquisition time. Equipment operating status indicates whether the corresponding regulating resource is in an operating state that allows it to participate in regulation.

[0022] It should be noted that different devices may have different sampling periods and data transmission delays. If the operating status records are combined directly according to the order in which they arrive at the fusion terminal of the distribution area, state variables formed at different times may be associated with the same control cycle. Therefore, the timing association uses the acquisition time written by the source device as the basis for time slice division.

[0023] The preset association time window is the time range stored in the substation fusion terminal before the execution of time-series association processing. The association time window is objectively determined according to the time distribution of the operation status records, rather than using a fixed value without any source.

[0024] In one implementation, operating status records that have been synchronized with the device clock, have complete area and device identifiers, have not been restarted, and whose status records can be mapped to the control cycle are selected to form the associated time window calibration data. Using the reference time of each control cycle as the time association benchmark, the absolute time difference between the acquisition time of each operating status record in the associated time window calibration data and the corresponding reference time is calculated to obtain the time difference sample.

[0025] The different time difference values ​​in the time difference sample are sorted in ascending order, and each time difference value is used as a candidate association time window. The association time window labeling data is divided into time slices using each candidate association time window, and the number of corresponding complete association time slices, the number of duplicate association records, and the number of non-association records are counted.

[0026] A complete associated time slice refers to a time slice containing all valid status records required for the current processing, and each status record can be uniquely identified as belonging to an object based on the station area identifier and device identifier. Duplicate associated records refer to multiple status records of the same device that all meet the association conditions within the same candidate association time window. Unassociated records refer to valid status records that have not been assigned to the corresponding control cycle.

[0027] The complete association ratio for each candidate association window is determined based on the ratio between the number of complete association time slices and the total number of calibrated time slices; the duplicate association ratio is determined based on the ratio between the number of duplicate association records and the total number of valid status records.

[0028] Select the candidate association window with the highest complete association ratio. When multiple candidate association windows have the same complete association ratio, select the candidate association window with the lower duplicate association ratio; when both the complete association ratio and the duplicate association ratio are the same, select the candidate association window with the smaller value. Store the selection result in the substation fusion terminal as the preset association window.

[0029] When the sampling period of the data source changes, the control period of the substation convergence terminal changes, or the communication path changes, the associated time window calibration data is reconstructed, and the associated time window is re-determined according to the above process. This determination process can be repeated based on the new operating status record, and does not require the associated time window to always remain at the same fixed value.

[0030] When performing time slice division, continuous time slices are established according to the associated time windows, and the acquisition time of each running status record is read. Running status records whose acquisition times fall into the same time slice are written into the same status segment, resulting in multiple status segments.

[0031] If a single valid operating status record exists for the same device within the same time slice, that record is determined as the device's status record within the current time slice. If multiple valid operating status records exist for the same device within the same time slice, the absolute time difference between the acquisition time of each record and the reference time of the current time slice is calculated, and the record with the smallest absolute time difference is determined as the device's status record within the current time slice. If multiple operating status records have the same absolute time difference, the record with the later acquisition time is selected.

[0032] For continuous measurement data, one implementation method can also use linear interpolation based on similar operating status records before and after the current time slice reference time to obtain the status value corresponding to the current time slice. When using linear interpolation, the two operating status records before and after each other should have the same substation identifier, equipment identifier, and status field, and should be within the valid data time range.

[0033] If a device has no valid operating status record within the current time slice, a data unavailable flag is written into the corresponding status record of that device. Status records with a data unavailable flag are not used as valid input for subsequent voltage over-limit identification or resource support capability assessment.

[0034] After the time slices are divided, the area identifier and device identifier of each operating status record in the status slice are read. The area to which the status record belongs is determined based on the area identifier, and the monitoring node or regulation resource corresponding to the status record is determined based on the device identifier.

[0035] Status fields with the same time slice, same transformer area identifier, and same equipment identifier are written into the same control record, and the time slice correspondence between each control record is retained to obtain transformer area control data. The transformer area control data can be stored using a time-series record table or a data structure with the same field relationship. Each control record includes at least a time slice, transformer area identifier, equipment identifier, status field, and data validity status. After the transformer area control data is formed, step S2 reads the corresponding node voltage according to the equipment identifier of the monitoring node, and step S3 reads the corresponding real-time output, equipment operating status, and communication link status according to the resource identifier of the regulating resource.

[0036] In step S2, voltage over-limit identification is performed based on the transformer area control data to obtain the target node, and demand assessment is performed based on the transformer area control data corresponding to the target node to obtain the regulation demand.

[0037] Among them, voltage over-limit identification is performed based on the transformer area control data to obtain the target node, including: Extract the node voltage of each monitoring node from the control data of the transformer area; The node voltage is compared with a preset allowable voltage range to obtain the over-limit node and the voltage deviation of the over-limit node; The nodes that exceed the limit are sorted in descending order according to the voltage deviation, and the node that exceeds the limit at the top of the list is determined as the target node.

[0038] In one implementation, the monitoring node is an electrical node within the photovoltaic distribution area that has node voltage measurement records. When extracting the node voltage, the control record with the object type of monitoring node and the data validity status is retrieved from the control data of the distribution area corresponding to the current time slot, and the node identifier, node voltage, and time slot in the control record are read.

[0039] If the node voltages of different monitoring nodes are expressed in different forms, a unified measurement standard should be established before performing interval comparisons. When the node voltage uses the actual voltage value, the node voltage and the voltage allowable interval boundary should be uniformly converted to the same voltage unit; when the node voltage uses a per-unit value, the node voltage and interval boundary should be converted to the same per-unit value standard according to the rated voltage of the corresponding node.

[0040] The preset voltage allowable range includes a lower voltage allowable boundary and an upper voltage allowable boundary. Before performing the current voltage over-limit identification, the voltage allowable range is calculated according to the rated voltage of the monitoring node and the corresponding allowable deviation boundary, and stored in the substation fusion terminal with the node identifier as an index.

[0041] Specifically, the rated voltage, allowable positive deviation ratio, and allowable negative deviation ratio of the monitoring node are read. The upper allowable voltage limit is obtained by adding the increment corresponding to the rated voltage and the allowable positive deviation ratio; the lower allowable voltage limit is obtained by subtracting the decrement corresponding to the allowable negative deviation ratio from the rated voltage.

[0042] Write the node identifier, lower allowable voltage limit, upper allowable voltage limit, corresponding voltage unit, and applicable wiring status into the same voltage range record. Summarize the voltage range records corresponding to each monitoring node to form a voltage allowable range table. The rated voltage is derived from the equipment or power distribution network parameter records of the corresponding monitoring node, and the allowable positive deviation ratio and allowable negative deviation ratio are derived from the applicable voltage operating boundaries of the corresponding connection point.

[0043] When multiple effective voltage operating ranges exist simultaneously for the same monitoring node, the intersection of these ranges is calculated, and this intersection is determined as the allowable voltage range for the corresponding monitoring node. If there is no intersection among the effective voltage operating ranges, a conflict flag is written to the corresponding monitoring node, and conflicting ranges are not used for voltage over-limit identification.

[0044] When the rated voltage, wiring status, or applicable voltage operating boundary of a monitoring node changes, the corresponding allowable voltage range is redefined according to the above calculation process, and the corresponding voltage range record is updated. During range comparison, the corresponding voltage range record is queried based on the monitoring node's node identifier, and the lower and upper allowable voltage boundaries are read. When the node voltage is between the lower and upper allowable voltage boundaries, the corresponding monitoring node is marked as an in-range node. When the node voltage is higher than the upper allowable voltage boundary, the corresponding monitoring node is identified as an upper limit-overflow node, and the difference between the node voltage and the upper allowable voltage boundary is calculated to obtain the corresponding voltage deviation. When the node voltage is lower than the lower allowable voltage boundary, the corresponding monitoring node is identified as a lower limit-overflow node, and the difference between the lower allowable voltage boundary and the node voltage is calculated to obtain the corresponding voltage deviation.

[0045] Upper and lower over-limit nodes together constitute over-limit nodes. Voltage deviation is a non-negative value, and its unit is consistent with the node voltage unit. The over-limit direction is recorded separately as upper or lower over-limit, not indicated by the sign of the voltage deviation. Over-limit nodes are arranged in descending order of voltage deviation. The sorting record includes at least the node identifier, over-limit direction, voltage deviation, and current time slice. When multiple over-limit nodes have different voltage deviations, the over-limit node with the larger voltage deviation is ranked first. When multiple over-limit nodes have the same voltage deviation, the over-limit records of each over-limit node within consecutive time slices are read, the over-limit duration from the first consecutive over-limit time slice to the current time slice is calculated, and the over-limit node with the longer over-limit duration is ranked first.

[0046] When the voltage deviation and over-limit duration are the same, calculate the difference between the current node voltage and the node voltage of the previous effective time slice for each over-limit node, and take the absolute value of the difference as the voltage change. Nodes with larger voltage changes are ranked first. When the voltage deviation, over-limit duration, and voltage change are all the same, arrange the over-limit nodes according to the order of their first over-limit moments, with the node whose first over-limit moment is earlier ranked first.

[0047] The node with the highest voltage deviation is identified as the target node. For cases where multiple nodes simultaneously exceed their limits, this invention employs a point-by-point management, safety verification, and periodic iteration strategy. In the current control cycle, only the node with the largest voltage deviation is targeted for control scheme generation. When allocating control quantities, multi-node voltage safety verification ensures that the current adjustment action will not trigger other nodes to exceed their limits or worsen existing deviations. Unprocessed nodes in this cycle are retained for re-identification and control in subsequent control cycles, gradually eliminating all nodes through rolling iterations over multiple control cycles. The remaining nodes are retained in the current time slice's node record for re-identification in subsequent control cycles and for multi-node voltage status verification during the control scheme generation process. When there are no nodes exceeding their limits in the current time slice, no target node or control requirement is generated, and the control scheme generation process for the current time slice ends.

[0048] Specifically, demand assessment is performed based on the control data of the transformer area corresponding to the target node to obtain the control demand, including: Extract the target node voltage from the control data of the transformer substation corresponding to the target node; The adjustment direction is determined based on the positional relationship between the target node voltage and the preset allowable voltage range, and the voltage deviation between the target node voltage and the corresponding boundary of the allowable voltage range is calculated. The adjustment requirement is generated based on the adjustment direction and the voltage deviation.

[0049] Read the node identifier and current time slice of the target node, and query the control data of the distribution area based on the node identifier and current time slice to obtain the control record corresponding to the target node. Read the node voltage from the control record to obtain the target node voltage.

[0050] The target node voltage and the node voltage used to determine the target node in the aforementioned voltage over-limit identification process belong to the same physical quantity. The target node voltage represents the intended use of the node voltage after the target node is determined, and is not a separate voltage quantity formed by re-acquisition.

[0051] Based on the target node's node identifier, query the corresponding voltage range record and read the lower and upper allowable voltage boundaries. When the target node voltage is higher than the upper allowable voltage boundary, determine the adjustment direction as the voltage reduction direction and calculate the difference between the target node voltage and the upper allowable voltage boundary to obtain the voltage deviation of the target node. When the target node voltage is lower than the lower allowable voltage boundary, determine the adjustment direction as the voltage increase direction and calculate the difference between the lower allowable voltage boundary and the target node voltage to obtain the voltage deviation of the target node.

[0052] The regulation demand is obtained by establishing a regulation demand record based on the target node's node identifier, current time slice, regulation direction, voltage deviation, and the adopted voltage range boundary. The voltage deviation in the regulation demand uses the same voltage unit or per-unit value as the target node's voltage. The regulation demand indicates the direction and degree of voltage regulation required by the target node within the current time slice, and does not directly indicate the active power control amount or reactive power control amount allocated to regulation resources.

[0053] The subsequent steps involve querying the regulating resources that have an electrical relationship with the target node, converting the available regulating capacity of each regulating resource into a resource support margin with the same measurement benchmark as the voltage deviation, and performing resource adaptation screening based on the regulating direction and the resource support direction.

[0054] In step S3, a preset electrical association table is queried based on the target node and the transformer area control data to obtain the control resources and electrical association data. The support capability is evaluated based on the electrical association data and the transformer area control data to obtain resource support data. The control resources are then adapted and screened based on the resource support data and the control requirements to obtain a candidate resource set.

[0055] Specifically, by querying a preset electrical association table based on the target node and the transformer area control data, the control resources and electrical association data are obtained, including: The preset electrical association table is queried based on the node identifier of the target node to obtain resource records that have electrical association with the target node; The adjustment resources are obtained by matching the resource identifiers in the resource records with the control data of the transformer area. The distribution area affiliation, regulation type, voltage support coefficient, and capacity boundary in the resource record are associated with the corresponding regulation resources to obtain electrical association data.

[0056] In one implementation, the preset electrical association table is a data table established and stored in the transformer substation fusion terminal before executing the current group control method. The electrical association table records the electrical relationships between monitoring nodes and regulating resources, enabling the transformer substation fusion terminal to determine the resources that regulate the voltage of the target node.

[0057] The pre-defined electrical association table includes multiple resource records, each corresponding to a set of monitoring nodes, regulating resources, and regulating types. The resource records use node identifier, resource identifier, and regulating type as a combined index, and record the transformer substation affiliation, electrical path status, voltage support coefficient, capacity boundary, and data validity status.

[0058] Node identifier is used to identify the monitoring node to which the regulating resource is applied; resource identifier is used to retrieve the corresponding regulating resource in the control data of the transformer area; regulation type is used to distinguish between active power regulation and reactive power regulation; transformer area affiliation is used to distinguish between local resources and collaborative transformer area resources.

[0059] It should be noted that in this invention, the transformer substation fusion terminal, as the edge computing node of the current control cycle, performs real-time decision-making steps such as acquiring operating status data, identifying voltage over-limits, assessing adjustment needs, evaluating support capabilities, screening for compatibility, and allocating control quantities. The transformer substation fusion terminal stores a pre-built electrical association table. The electrical path status and voltage support coefficient in the electrical association table are pre-determined by the master station or distribution automation system based on the transformer substation topology parameters and offline power flow calculations, and are stored in the transformer substation fusion terminal through periodic distribution or on-demand download. When the transformer substation topology changes significantly, the master station recalculates and updates the electrical association table and then downloads it to the transformer substation fusion terminal again. Thus, the transformer substation fusion terminal only needs to perform table lookup operations and arithmetic calculations within the real-time control cycle, without needing to solve the power flow equations online, which ensures the real-time performance of edge control and reduces the computing power requirements of edge devices.

[0060] Electrical path status indicates whether there exists an electrical connection path between the regulating resource and the corresponding monitoring node capable of transmitting power regulation. The electrical path status is determined based on line connections, transformer connections, switch status, and transformer substation interconnection status in the distribution topology. Specifically, the connection records of each electrical node, line, transformer, and switch in the distribution network are read, and closed line connections, transformer connections, and interconnection connections are written into the topological adjacency relationship. A path search is performed within this topological adjacency relationship, starting from the access node of the regulating resource and ending at the corresponding monitoring node.

[0061] When the corresponding monitoring node can be reached from the access node of the regulating resource, the corresponding electrical path status is marked as connected; when there is no reachable path, or the switches or interconnected devices in the path are in a disconnected, locked or uncontrollable state, the corresponding electrical path status is marked as disconnected.

[0062] For collaborative distribution area resources, a corresponding cross-distribution area resource record is established only when an electrical action path exists in the actual distribution topology from the resource access node to the target node. Distribution areas that only have a communication connection with photovoltaic distribution areas but do not have an electrical action path are not required to establish a separate cross-distribution area resource record based on the communication connection.

[0063] In one implementation, the electrical path can be formed via a common upper-level distribution network or via interconnected transformer substations in a power-exchange-allowed state. The specific path type is determined based on the actual distribution topology, and no single interconnection structure is limited to a structure that must be present in all implementations.

[0064] It should be noted that electrical path connectivity only indicates that the corresponding resource has the physical basis to exert an electrical effect on the target node, and does not directly indicate that the resource has sufficient voltage regulation capability. The magnitude and direction of the effect still need to be quantified using the voltage support coefficient.

[0065] The pre-defined electrical association table's record structure and static topology association entries can be established before the distribution area convergence terminal is put into operation. The voltage support coefficient is calculated based on the distribution topology and operating status corresponding to the current time slice and written to the corresponding resource record.

[0066] When determining the voltage support coefficient, the line resistance, line reactance, transformer ratio and transformer impedance are read from the power distribution equipment parameter record, the node voltage of each monitoring node in the current time slice, the active power injection and reactive power injection of each node are read from the distribution area control data, and the current switch status and interconnection status are read.

[0067] The above data are converted to units using the same capacity and voltage benchmarks to establish the power flow calculation relationship corresponding to the current operating point. For calculations using actual values, line parameters, power quantities, and node voltages use matching actual units; for calculations using per-unit values, each physical quantity is converted to a per-unit value according to the preset benchmark capacity and the benchmark voltage of the corresponding voltage level.

[0068] In one implementation, the sensitivity relationship between changes in the control quantity of regulating resources and voltage changes at each monitoring node can be calculated based on the power flow Jacobian matrix at the current operating point. For active power regulation, the change in active power of the corresponding regulating resource is used as the control variable to obtain the node voltage change corresponding to a unit change in active power, which is then used as the active power voltage support coefficient. For reactive power regulation, the change in reactive power of the corresponding regulating resource is used as the control variable to obtain the node voltage change corresponding to a unit change in reactive power, which is then used as the reactive power voltage support coefficient.

[0069] The voltage support coefficient includes its numerical value and its sign. The numerical value of the voltage support coefficient indicates the degree of voltage change at the corresponding monitoring node caused by a unit change in the control variable, while the sign indicates whether the node voltage increases or decreases when the control variable changes in the positive direction.

[0070] When using actual voltage values, the unit of the active voltage support factor is voltage units divided by active power units, and the unit of the reactive voltage support factor is voltage units divided by reactive power units. When using per-unit values, the voltage support factor is expressed in per-unit form corresponding to the per-unit control quantity.

[0071] In another implementation, when the power flow Jacobian matrix cannot be directly obtained from the transformer area fusion terminal, the voltage support coefficient can be determined by using control quantity disturbance calculation. For each regulating resource, a positive control quantity change and a negative control quantity change are generated within its capacity boundary, and power flow calculations are performed on each to obtain the predicted voltage change of the corresponding monitoring node.

[0072] For continuously regulated resources, the control quantity change can be represented by the power change corresponding to the equipment control resolution; for discretely regulated resources, the control quantity change is represented by a minimum executable adjustment step size. The voltage support coefficient is obtained by dividing the predicted voltage change by the corresponding control quantity change. When using the control quantity disturbance calculation method, the forward and reverse control quantity changes form the corresponding voltage support coefficients, and the forward result is not directly substituted for the reverse result.

[0073] When power flow calculation fails to converge, electrical path status is not connected, control quantity changes exceed equipment capacity boundaries, or calculation results are not finite values, the data validity status of the corresponding resource record is marked as invalid, and the resource record is not used for resource matching in the current control cycle.

[0074] Before executing the target node query in each control cycle, the voltage support coefficient in each resource record can be recalculated based on the distribution topology and operating status corresponding to the current time slice. Thus, the record structure and electrical topology relationships of the electrical association table are pre-established, and the voltage support coefficient is updated according to the current operating point, preventing the same offline fixed coefficient from being used for all loads and photovoltaic output statuses.

[0075] Capacity boundaries represent the lower and upper limits of output that a regulating resource is allowed to achieve under the corresponding regulating type. Capacity boundaries can be directly fed from the regulating resource, or they can be calculated based on the equipment's rated parameters, current output, and equipment control constraints.

[0076] For independent reactive power compensation devices, the capacity boundary is the range of reactive power that the corresponding device is allowed to output or absorb. For the reactive power regulation function of photovoltaic inverters, the dynamic reactive power capacity boundary currently transmitted by the photovoltaic inverter can be read. In one implementation, the theoretical reactive power capacity range can also be calculated based on the rated apparent power and current active power output of the photovoltaic inverter, and then the intersection with the reactive power limit set by the device can be taken to obtain the capacity boundary.

[0077] For the active power regulation function of a photovoltaic inverter, the upper limit of the capacity is the available active power under the current irradiance conditions and equipment operating limitations, and the lower limit of the capacity is the minimum active power control value allowed by the equipment. The available active power can be determined by the available power status or maximum power point tracking results transmitted by the photovoltaic inverter.

[0078] Using the node identifier of the target node as the query condition, resource records with the same node identifier, connected electrical path status, and valid data status are read from the electrical association table to obtain resource records that have an electrical relationship with the target node.

[0079] The resource identifier is read from each resource record, and the corresponding control data for the current time slice is queried based on the resource identifier. When a control record with the same resource identifier and normal data validity status exists in the control data for the current time slice, the corresponding device is identified as the control resource.

[0080] When a corresponding resource record exists in the electrical association table, but no valid control record for the current time slice exists in the distribution area control data, the resource is marked as unavailable and is not considered an available control resource in the current control cycle.

[0081] The transformer substation affiliation, regulation type, voltage support coefficient, and capacity boundary in the resource record are written into the association record of the corresponding regulation resource. The association record is then linked with the real-time output, equipment operating status, and communication link status in the current time slice to obtain electrical association data.

[0082] Once the electrical correlation data is generated, it is used to calculate the voltage support capability that each regulating resource can provide to the target node under the current operating state.

[0083] Among them, the support capability assessment is performed based on the electrical correlation data and the transformer area control data to obtain resource support data, including: Read the real-time output of each regulating resource from the aforementioned transformer area control data; Based on the capacity boundaries in the real-time output and the electrical correlation data, the available adjustment capacity of each adjustment resource in the direction of increasing output and decreasing output is determined, and directional capacity data is obtained. The resource support margin is obtained by multiplying the available adjustable capacity in the directional capacity data with the voltage support coefficient in the electrical correlation data. The resource support direction is determined based on the adjustment type in the electrical correlation data and the direction of increased or decreased output in the directional capacity data, and resource support data is generated based on the resource support direction and the resource support margin.

[0084] Based on the resource identifier in the electrical correlation data, query the control data of the corresponding transformer area for the current time slice, and read the real-time output of the control resource from the corresponding control record. When the control type is active power control, read the real-time active power output; when the control type is reactive power control, read the real-time reactive power output. The real-time output and the corresponding capacity boundary use the same physical quantity and the same unit of measurement.

[0085] For each regulating resource, the upper and lower limits of output are read from the electrical correlation data. The difference between the upper limit of output and the real-time output is calculated to obtain the available regulating capacity of the regulating resource in the direction of increasing output; the difference between the real-time output and the lower limit of output is calculated to obtain the available regulating capacity of the regulating resource in the direction of decreasing output.

[0086] When the real-time output equals the upper limit of the output, the available adjustment capacity in the direction of increasing output is zero; when the real-time output equals the lower limit of the output, the available adjustment capacity in the direction of decreasing output is zero. When the real-time output exceeds the capacity limit due to status data delay or equipment boundary update, the negative difference is not used as the available adjustment capacity. Instead, the available adjustment capacity in the corresponding direction is recorded as zero, and the adjustment resource is written into the boundary verification record.

[0087] The resource identifier, regulation type, available regulation capacity in the direction of increasing output, and available regulation capacity in the direction of decreasing output are written into the direction capacity record to obtain the direction capacity data. For photovoltaic active power resources, it is determined whether the current operating state has actual margin for increasing output and actual margin for decreasing output. When the photovoltaic inverter is in maximum power point tracking mode and the real-time active power output has reached the current available active power, the available regulation capacity in the direction of increasing output is set to zero. When the photovoltaic inverter is operating below the current available active power due to a preceding power limiting command, the difference between the current available active power and the real-time active power output is determined as the available regulation capacity in the direction of increasing output.

[0088] The difference between real-time active power output and its lower boundary is defined as the available regulation capacity in the direction of reduced output. Therefore, photovoltaic active power resources in maximum power point tracking (MPPT) can form regulation capacity in the direction of active power reduction, but non-existent active power generation capacity is not written into the directional capacity data. The voltage support coefficient of the corresponding regulation resource is read from the electrical correlation data. The product of the available regulation capacity in the direction of increased output and the available regulation capacity in the direction of reduced output with the voltage support coefficient is calculated to obtain the resource support margin for each direction.

[0089] Resource support margin represents the maximum voltage change that regulation resources can generate at the target node when all available regulation capacity is used in the corresponding direction. For active power regulation resources, it is calculated using active power regulation capacity and active power voltage support coefficient; for reactive power regulation resources, it is calculated using reactive power regulation capacity and reactive power voltage support coefficient. Both calculation results are standardized to voltage units or the same per-unit value benchmark.

[0090] The resource support direction indicates the direction of voltage change at the target node when the regulating resource moves along the corresponding output direction, including the voltage increase direction and the voltage decrease direction. When determining the resource support direction, the increasing output direction is represented as a positive change in the control variable, and the decreasing output direction is represented as a negative change in the control variable. The direction of voltage change at the target node is then determined by combining the sign of the voltage support coefficient.

[0091] When the direction of change of the control variable is combined with the sign of the voltage support coefficient, the direction of resource support is determined as the direction of voltage increase when the voltage of the target node increases; when the voltage of the target node decreases, the direction of resource support is determined as the direction of voltage decrease.

[0092] It should be noted that the direction of increasing output power is not necessarily the same as the direction of increasing voltage, and the direction of decreasing output power is not necessarily the same as the direction of decreasing voltage. The direction of resource support is determined by the type of regulation, the direction of change of the control variable, and the sign of the voltage support coefficient.

[0093] For each available output direction of each regulating resource, the resource identifier, transformer area affiliation, regulating type, available regulating capacity, resource support direction, resource support margin, and voltage support coefficient are written into the resource support record. When the same regulating resource has available regulating capacity in both the increasing and decreasing output directions, two resource support records are generated respectively. All resource support records constitute the resource support data. The resource support margin in the resource support data adopts the same voltage unit or per-unit value as the voltage deviation in the regulating demand, and is used for subsequent resource direction adaptation and control quantity allocation.

[0094] Specifically, the adjustment resources are adapted and screened based on the resource support data and the adjustment requirements to obtain a candidate resource set, including: The adjustment direction is read from the adjustment demand, and the resource support direction and resource support margin of each adjustment resource are read from the resource support data. The resource support direction is compared with the adjustment direction, and the adjustment resources whose resource support direction is consistent with the adjustment direction are retained to obtain the direction-adapted resources; Based on the equipment status and communication status in the control data of the transformer area, the available status of the directional adaptation resources is filtered to obtain the available resources; The available resources are sorted in descending order according to the resource support margin to obtain a candidate resource set.

[0095] The adjustment direction of the target node is read from the adjustment demand, whereby the adjustment direction is either the voltage increase direction or the voltage decrease direction. Resource support records in the resource support data are read one by one to obtain the resource support direction and resource support margin of the corresponding adjustment resource.

[0096] The resource support direction in each resource support record is compared with the adjustment direction in the adjustment requirement. When the resource support direction matches the adjustment direction, the corresponding resource support record is retained; when the resource support direction is opposite to the adjustment direction, the corresponding resource support record is not written into the direction adaptation result.

[0097] The adjustment resources corresponding to the retained resource support records are identified as direction-adaptive resources. When the adjustment demand is in the buck direction, only the resource support records that can reduce the target node voltage are retained; when the adjustment demand is in the boost direction, only the resource support records that can increase the target node voltage are retained.

[0098] After obtaining the direction-adaptive resources, the corresponding control data for the current time slice is queried based on the resource identifier, and the operating status of the corresponding equipment and the corresponding communication link status are read. The equipment operating status indicates whether the control resource is currently allowed to receive and execute control commands. The equipment operating status meets the control conditions when it is in normal operating condition and not in a fault, maintenance, or control lockout state. The communication link status indicates whether the status data transmission link and control command transmission link between the substation convergence terminal and the control resource are available.

[0099] In one implementation, the communication link state is determined to be available when the corresponding adjustment resource has a valid state record within the current time slice and the control command transmission link is in a connected state. When there is no valid state record within the current time slice, or when the control command transmission link is in an interrupted state, the communication link state is determined to be unavailable.

[0100] For cross-regional adaptation resources, the communication link status and electrical path status of the corresponding cooperating region are also read. Only when the equipment operating status, communication link status, and electrical path status all meet the control conditions will the corresponding cross-regional resource be determined as an available resource.

[0101] Therefore, the status of the equipment itself in the control data of the distribution area is uniformly referred to as the equipment operating status, and the status of the data and command channel between the distribution area fusion terminal and the equipment or the collaborative distribution area is uniformly referred to as the communication link status.

[0102] Adjustment resources that simultaneously meet the directional adaptation condition, equipment operating status condition, and communication link status condition are identified as available resources. The resource support margin corresponding to each available resource is read, and the available resources are arranged in descending order of resource support margin. When two available resources have different resource support margins, the available resource with the larger resource support margin is placed first. When two available resources have the same resource support margin, the original order of the corresponding resources recorded in the electrical association table can be maintained. This same-value handling is only used to form a fixed record order and does not change the subsequent processing rules for resource grouping according to transformer area affiliation and adjustment type.

[0103] The resource identifier, transformer area affiliation, regulation type, available regulation capacity, resource support direction, resource support margin, voltage support coefficient, and arrangement order are written into the candidate resource record. The candidate resource records are then aggregated to obtain the candidate resource set. This candidate resource set serves as the input for step S4, used to divide resource groups according to transformer area affiliation and regulation type, and to allocate control quantities within the corresponding available regulation capacity range.

[0104] like Figure 2 As shown in the figure, this is a schematic diagram of the resource support margin ranking of the candidate resource set. The figure shows that after filtering by resource support direction, equipment operating status, communication link status and electrical path status, 11 adjustment resources enter the candidate resource set and are arranged in descending order of resource support margin. The local reactive power resource group, the cross-transformer reactive power resource group and the photovoltaic active power resource group all retain resources that can support the voltage reduction of the target node.

[0105] In step S4, control quantities are allocated based on the regulation requirements and the candidate resource set to obtain a regulation scheme, including: Based on the distribution area affiliation and regulation type of the candidate resource set, the candidate resource set is divided into local reactive power resource group, cross-distribution area reactive power resource group and photovoltaic active power resource group; According to the order of the local reactive power resource group, the cross-regional reactive power resource group and the photovoltaic active power resource group, the control quantity is allocated sequentially within the available regulation capacity corresponding to each regulation resource, and the regulation demand is updated according to the allocated control quantity to obtain the remaining regulation demand. When the remaining adjustment demand is zero or the candidate resource set has no available adjustment capacity, the allocation of control quantity is stopped, and an adjustment scheme is generated based on the resource identifier, adjustment type, control quantity, and execution order of each adjustment resource.

[0106] Read each candidate resource record in the candidate resource set one by one, and read the distribution area affiliation and regulation type from each candidate resource record. The distribution area to which the target node belongs is the local distribution area. When the distribution area of ​​a candidate resource belongs to the local distribution area and the regulation type is reactive power regulation, the corresponding candidate resource is written to the local reactive power resource group. When the distribution area of ​​a candidate resource belongs to a coordinated distribution area, the regulation type is reactive power regulation, and the corresponding electrical path status and communication link status meet the control conditions, the corresponding candidate resource is written to the cross-distribution area reactive power resource group. When the regulation type of a candidate resource is photovoltaic active power regulation, the corresponding candidate resource is written to the photovoltaic active power resource group.

[0107] When a single photovoltaic inverter possesses both active power regulation and reactive power regulation capabilities, candidate resource records are generated separately based on the different regulation types. Corresponding reactive power regulation records are written into the local reactive power resource group or the cross-regional reactive power resource group according to the transformer substation affiliation, while corresponding active power regulation records are written into the photovoltaic active power resource group. Within each resource group, the descending order of the candidate resource set based on resource support margin is used.

[0108] When control quantity allocation begins, the voltage deviation in the regulation demand is copied as the initial remaining regulation demand. This remaining regulation demand is processed sequentially using the same voltage unit or per-unit value as the resource support margin, for the local reactive power resource group, the cross-regional reactive power resource group, and the photovoltaic active power resource group. Only when the available resources in the current resource group cannot reduce the remaining regulation demand to zero will the next resource group be processed.

[0109] It should be noted that the resource group order mentioned above indicates the processing order of control quantity allocation, and does not mean that all adjustment resources in the previous resource group must be used up to the capacity boundary. When some resources in the current resource group have already met the remaining adjustment needs, control quantity allocation to subsequent resources in the current resource group and the next resource group is stopped.

[0110] For the current candidate resource, the available regulating capacity, voltage support coefficient, and resource support margin are read from the candidate resource record. When the resource support margin of the current candidate resource is less than or equal to the remaining regulating demand, all available regulating capacity in the corresponding direction of the candidate resource is determined as the control quantity to be allocated. When the resource support margin of the current candidate resource is greater than the remaining regulating demand, the remaining regulating demand is divided by the absolute value of the voltage support coefficient to obtain the theoretical control quantity required to satisfy the current remaining regulating demand.

[0111] The theoretical control quantity is compared with the available adjustment capacity of the current candidate resources. When the theoretical control quantity is not greater than the available adjustment capacity, the theoretical control quantity is determined as the control quantity to be allocated; when the theoretical control quantity is greater than the available adjustment capacity, the available adjustment capacity is determined as the control quantity to be allocated.

[0112] The control quantities to be allocated are expressed in power units corresponding to the regulation type. The control quantities to be allocated for local reactive resources and cross-regional reactive resources are expressed in reactive power units, while the control quantities to be allocated for photovoltaic active resources are expressed in active power units. Based on the magnitude, control direction, and corresponding voltage support coefficient of the control quantities to be allocated, the predicted voltage support that the control quantities to be allocated can provide to the target node is calculated.

[0113] When using a linear sensitivity relationship near the current operating point, the predicted voltage support value corresponding to the control variable to be assigned is the product of the control variable to be assigned and the voltage support coefficient. The predicted voltage support values ​​of multiple candidate resources are accumulated according to the same voltage reference under the condition that the adjustment direction is consistent.

[0114] The aforementioned linear relationship is used to form the initial allocation values ​​for control quantities. In one implementation, before accepting the control quantities to be allocated, power flow calculations can be performed based on the current distribution topology and the accumulated control quantities to be allocated to obtain the predicted node voltages of each monitoring node.

[0115] During multi-node voltage safety verification, the current node voltage of each monitoring node is read from the distribution area control data of the current time slice, and the predicted node voltage after the control is executed is calculated based on the cumulative control quantity to be assigned. When the predicted node voltage of the target node changes towards the voltage allowable range, and other monitoring nodes that were originally within the voltage allowable range remain within their corresponding voltage allowable range after the control is executed, and the voltage deviation of other existing over-limit nodes does not increase, the control quantity to be assigned is determined to have passed the multi-node voltage safety verification. When the control quantity to be assigned causes a new voltage over-limit for a monitoring node that was not originally over-limit, or increases the voltage deviation of other existing over-limit nodes, the control quantity to be assigned is reduced and the predicted node voltage is recalculated.

[0116] For continuously adjustable resources, the control quantity can be gradually reduced between zero and the original control quantity to be allocated. After each reduction, the multi-node voltage safety check is re-performed until a control quantity that meets the safety check is obtained or the control quantity is reduced to zero.

[0117] In one implementation, the unit of decrease in the continuous control quantity is the control resolution of the corresponding regulating resource. The control resolution is read from the equipment parameter record. When there is no value within the available regulating capacity that can pass the multi-node voltage safety check, the control quantity is not assigned to the current candidate resource, and the next candidate resource in the current resource group is processed.

[0118] For resources with tiered switching or discrete adjustment characteristics, the control quantity is determined based on the executable gears in the equipment parameter record. The equipment parameter record includes at least the power control quantity corresponding to each executable gear, arranged in ascending order of control quantity.

[0119] Based on the position of the theoretical control value in the executable sequence, the smallest executable control value that is no greater than the theoretical control value and closest to it, and the largest executable control value that is no less than the theoretical control value and closest to it, are read. When the theoretical control value is the same as an executable control value, only that executable control value is considered as a candidate control value. If neither a smaller nor a larger executable control value exists, only the candidate control values ​​that can be read from the executable sequence are retained.

[0120] Multi-node voltage safety verification is performed using each candidate control quantity. Candidate control quantities that cause new node voltage exceedances or further worsen existing exceedance nodes are eliminated. For candidate control quantities that pass the safety verification, the remaining regulation demand of the target node after execution is calculated, and the candidate control quantity with the smaller absolute value of the remaining regulation demand is selected as the actual allocated control quantity. When multiple candidate control quantities correspond to the same absolute value of the remaining regulation demand, the candidate control quantity with the smaller absolute value is selected.

[0121] Through the above processing, when the voltage support corresponding to the minimum executable adjustment step size of the device is greater than the current remaining adjustment demand, the actual allocated control quantity is not directly determined to be zero. Instead, the predicted results corresponding to adjacent executable control quantities are compared. After the control quantity to be allocated passes the corresponding verification, it is determined as the actual allocated control quantity of the current candidate resource. The product of the actual allocated control quantity and the voltage support coefficient is calculated to obtain the actual predicted voltage support quantity of the current candidate resource. The actual predicted voltage support quantity is subtracted from the current remaining adjustment demand to obtain the updated remaining adjustment demand.

[0122] It should be noted that the amount deducted from the remaining regulation demand is the actual predicted voltage support expressed in voltage units or per-unit values, not the active power control amount or reactive power control amount directly deducted from the voltage deviation. When the actual predicted voltage support amount is greater than the current remaining regulation demand, but the corresponding actual allocated control amount has passed the multi-node voltage safety verification, the difference between the actual predicted voltage support amount and the current remaining regulation demand is calculated, and this difference is recorded as the remaining deviation in the opposite direction.

[0123] In one implementation, when the residual deviation in the opposite direction is not greater than the data representation resolution of the node voltage, the residual regulation demand is recorded as zero. The data representation resolution of the node voltage is determined by the accuracy of the voltage field in the distribution area control data, without setting a fixed tolerance without a source. After each candidate resource control quantity allocation is completed, the resource identifier, regulation type, control direction, actual allocated control quantity, actual predicted voltage support quantity, and current allocation order are written into the control quantity allocation record.

[0124] When the updated remaining regulation demand is zero, stop allocating control quantities. When there are no unprocessed available resources in the current resource group and the remaining regulation demand is still greater than zero, proceed to the next resource group to continue allocating control quantities. When there is no remaining available regulation capacity in the local reactive power resource group, the cross-regional reactive power resource group, and the photovoltaic active power resource group, stop allocating control quantities.

[0125] For cases where the target node requires voltage boosting, if all photovoltaic active resources are in maximum power point tracking (MPPT) mode and there is no actual active power margin, then there are no active resource records in the photovoltaic active resource group for the voltage boosting direction, and no fictitious power boosting control amount is added to the photovoltaic active resources. When there is still a remaining regulation demand after all candidate resources have been processed, the remaining regulation demand and resource insufficiency status can be written into the control scheme to indicate that the currently available regulation resources cannot fully meet the current regulation demand.

[0126] After stopping the allocation of control quantities, the execution order is determined according to the allocation order of each control quantity allocation record. The resource identifier, regulation type, control direction, actual allocated control quantity, and execution order of each regulating resource are written into the control scheme to obtain the control scheme. For local reactive power resources, the control quantity in the control scheme represents the reactive power output that the corresponding local regulating resource needs to increase or decrease; for cross-regional reactive power resources, the control quantity in the control scheme represents the reactive power regulation that the corresponding coordinated region regulating resource needs to execute; for photovoltaic active power resources, the control quantity in the control scheme represents the active power output that the corresponding photovoltaic inverter needs to reduce or restore when there is an actual margin for increased output.

[0127] In one implementation, the control scheme can also record the target node identifier, the current time slice, the predicted voltage support for each control quantity, the predicted node voltage for each monitoring node, and the remaining unmet regulation requirements. After generating the control scheme, the distribution area fusion terminal can generate control commands based on the control interface corresponding to each resource identifier, and reacquire the operating status data in the next control cycle to update the distribution area control data and subsequent control scheme.

[0128] For example, Figure 3This is a schematic diagram of the changes in residual regulation demand before and after the allocation of control quantities. The diagram shows that the initial residual regulation demand increases significantly twice as the target node voltage exceeds the limit. After the control quantities are allocated in the order of local reactive power resource group, cross-regional reactive power resource group and photovoltaic active power resource group, the residual regulation demand drops to zero for most control cycles. Unmet residual regulation demand is retained during periods when equipment operation status and communication link status are restricted, with a maximum value of 2.039 volts.

[0129] In summary, this invention forms regional regulation data by performing time-series correlation on the operational status data of photovoltaic (PV) distribution areas and collaborative distribution areas. Based on this regional regulation data, it identifies target nodes and regulation needs corresponding to voltage over-limit conditions. Furthermore, it queries an electrical correlation table based on the target nodes to determine regulation resources with electrical relationships to the target nodes, and combines the real-time output, capacity boundaries, and voltage support coefficients of these regulation resources to form resource support data. On this basis, it filters candidate resources according to resource support direction, resource support margin, equipment status, and communication status, and allocates control quantities to the candidate resources according to regulation needs to generate a regulation scheme. This achieves the matching of collaborative regulation resources with voltage regulation needs and the generation of group regulation and control schemes in low-voltage distributed PV distribution areas.

[0130] The second embodiment of the present invention provides a low-voltage distributed photovoltaic group control system based on a transformer substation fusion terminal, comprising: a memory, a processor, and a computer program stored in the memory and executable on the processor, wherein the processor executes the program to implement the method described above.

[0131] It should be noted that the low-voltage distributed photovoltaic group control system based on the integrated terminal of the transformer substation provided in this embodiment of the invention is used to execute all the process steps of the low-voltage distributed photovoltaic group control method based on the integrated terminal of the transformer substation in the above embodiment. The working principle and beneficial effect of the two are one-to-one, so they will not be described again.

[0132] It should be noted that the system embodiments described above are merely illustrative. The units described as separate components may or may not be physically separate, and the components shown as units may or may not be physical units; that is, they may be located in one place or distributed across multiple network units. Some or all of the modules can be selected to achieve the purpose of this embodiment according to actual needs. Those skilled in the art can understand and implement this without any creative effort.

[0133] The specific embodiments described above further illustrate the purpose, technical solution, and beneficial effects of the present invention. It should be understood that the above descriptions are merely specific embodiments of the present invention and are not intended to limit the scope of protection of the present invention. In particular, it should be noted that any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the scope of protection of the present invention for those skilled in the art.

Claims

1. A method for group control and regulation of low-voltage distributed photovoltaic systems based on integrated distribution terminal, characterized in that, include: Obtain the operating status data of the photovoltaic power station area and the coordinated power station area, and perform time-series correlation on the operating status data to obtain the power station area control data; Voltage over-limit identification is performed based on the transformer area control data to obtain the target node, and demand assessment is performed based on the transformer area control data corresponding to the target node to obtain the regulation demand; The system queries a preset electrical association table based on the target node and the transformer area control data to obtain control resources and electrical association data. Based on the electrical association data and the transformer area control data, the system performs a support capability assessment to obtain resource support data. Based on the resource support data and the control requirements, the system adapts and filters the control resources to obtain a candidate resource set. Based on the regulation requirements and the candidate resource set, control quantities are allocated to obtain a regulation scheme.

2. The low-voltage distributed photovoltaic group control method based on the integrated terminal of the transformer substation as described in claim 1, characterized in that, The step of performing time-series correlation on the operating status data to obtain the transformer area control data includes: The acquisition time, station area identifier, and device identifier are read from the operation status data. The operation status data is divided into time slices according to the preset associated time window to obtain status segments. Based on the transformer area identifier and the device identifier, the state segments within the same time slice are recorded and associated to obtain transformer area control data.

3. The low-voltage distributed photovoltaic group control method based on the integrated terminal of the transformer substation as described in claim 1, characterized in that, The step of identifying voltage over-limits based on the transformer area control data to obtain the target node includes: Extract the node voltage of each monitoring node from the control data of the transformer area; The node voltage is compared with a preset allowable voltage range to obtain the over-limit node and the voltage deviation of the over-limit node; The nodes that exceed the limit are sorted in descending order according to the voltage deviation, and the node that exceeds the limit at the top of the list is determined as the target node.

4. The low-voltage distributed photovoltaic group control method based on the integrated terminal of the transformer substation as described in claim 3, characterized in that, The step of assessing demand based on the control data of the transformer substation corresponding to the target node to obtain the control demand includes: Extract the target node voltage from the control data of the transformer substation corresponding to the target node; The adjustment direction is determined based on the positional relationship between the target node voltage and the preset allowable voltage range, and the voltage deviation between the target node voltage and the corresponding boundary of the allowable voltage range is calculated. The adjustment requirement is generated based on the adjustment direction and the voltage deviation.

5. The low-voltage distributed photovoltaic group control method based on the integrated terminal of the transformer substation as described in claim 1, characterized in that, The step of querying a preset electrical association table based on the target node and the transformer area control data to obtain control resources and electrical association data includes: The preset electrical association table is queried based on the node identifier of the target node to obtain resource records that have electrical association with the target node; The adjustment resources are obtained by matching the resource identifiers in the resource records with the control data of the transformer area. The distribution area affiliation, regulation type, voltage support coefficient, and capacity boundary in the resource record are associated with the corresponding regulation resources to obtain electrical association data.

6. The low-voltage distributed photovoltaic group control method based on the integrated terminal of the transformer substation as described in claim 1, characterized in that, The step of assessing support capabilities based on the electrical correlation data and the transformer area control data to obtain resource support data includes: Read the real-time output of each regulating resource from the aforementioned transformer area control data; Based on the capacity boundaries in the real-time output and the electrical correlation data, the available adjustment capacity of each adjustment resource in the direction of increasing output and decreasing output is determined, and directional capacity data is obtained. The resource support margin is obtained by multiplying the available adjustable capacity in the directional capacity data with the voltage support coefficient in the electrical correlation data. The resource support direction is determined based on the adjustment type in the electrical correlation data and the direction of increased or decreased output in the directional capacity data, and resource support data is generated based on the resource support direction and the resource support margin.

7. The low-voltage distributed photovoltaic group control method based on the integrated terminal of the transformer substation as described in claim 1, characterized in that, The step of adapting and filtering the adjustment resources based on the resource support data and the adjustment requirements to obtain a candidate resource set includes: The adjustment direction is read from the adjustment demand, and the resource support direction and resource support margin of each adjustment resource are read from the resource support data. The resource support direction is compared with the adjustment direction, and the adjustment resources whose resource support direction is consistent with the adjustment direction are retained to obtain the direction-adapted resources; Based on the equipment status and communication status in the control data of the transformer area, the available status of the directional adaptation resources is filtered to obtain the available resources; The available resources are sorted in descending order according to the resource support margin to obtain a candidate resource set.

8. The low-voltage distributed photovoltaic group control method based on the integrated terminal of the transformer substation as described in claim 1, characterized in that, The step of allocating control quantities based on the adjustment requirements and the candidate resource set to obtain an adjustment scheme includes: Based on the distribution area affiliation and regulation type of the candidate resource set, the candidate resource set is divided into local reactive power resource group, cross-distribution area reactive power resource group and photovoltaic active power resource group; According to the order of the local reactive power resource group, the cross-regional reactive power resource group and the photovoltaic active power resource group, the control quantity is allocated sequentially within the available regulation capacity corresponding to each regulation resource, and the regulation demand is updated according to the allocated control quantity to obtain the remaining regulation demand. When the remaining adjustment demand is zero or the candidate resource set has no available adjustment capacity, the allocation of control quantity is stopped, and an adjustment scheme is generated based on the resource identifier, adjustment type, control quantity, and execution order of each adjustment resource.

9. A low-voltage distributed photovoltaic group control system based on a transformer substation fusion terminal, comprising a memory, a processor, and a computer program stored in the memory and executable on the processor, characterized in that, When the processor executes the program, it implements the method according to any one of claims 1 to 8.

10. A computer-readable storage medium having a computer program stored thereon, characterized in that, When executed by a processor, the program implements the method described in any one of claims 1 to 8.

Images