A voltage dynamic adjustment method based on a hybrid flexible suspension

Abstract

The application provides a voltage dynamic adjustment method based on a hybrid flexible suspension, and the method comprises the following steps: acquiring the current voltage of a plurality of controlled nodes downstream of a same series voltage regulation unit, an allowable voltage range and an executable voltage regulation range of the series voltage regulation unit, converting the voltage constraints of the controlled nodes into series regulation allowable intervals for a same common series voltage regulation amount; obtaining a node common allowable interval of each series regulation allowable interval, and obtaining a common series feasible region by intersecting the node common allowable interval with the executable voltage regulation range of the series voltage regulation unit, and determining a maximum lower limit value and a minimum upper limit value. The application converts the voltage requirements of the plurality of controlled nodes into allowable intervals for the same series regulation amount, so as to evaluate the parallel power regulation amount by means of the boundary difference component constraint, and make the parallel regulation directly aim at the node constraint conflict causing the common series regulation limitation, and reduce the repeated adjustment condition according to the voltage deviation of a single node.

Description

Technical Field

[0001] This invention relates to the field of smart grid regulation technology, and in particular to a method for dynamic voltage regulation based on a hybrid flexible suspension. Background Technology

[0002] In low-voltage AC distribution lines, variations in distributed photovoltaic output, load fluctuations, and line impedance can cause voltage differences at different nodes along the line. To regulate node voltage, flexible power regulation devices, including series voltage regulation units and parallel power compensation units, can be installed in the line. The series voltage regulation unit injects regulating voltage into the line, changing the voltage levels of multiple downstream nodes; the parallel power compensation unit adjusts the power flow and voltage distribution along the line by changing the active or reactive power at the connection point. The control system typically determines the regulation amount based on node voltage deviation, equipment regulation capacity, and line operating status, and checks whether the node voltage is within the allowable range after the equipment executes the regulation.

[0003] When the load distribution or photovoltaic output of a line changes, multiple nodes downstream of the same series voltage regulation unit may experience different voltage regulation requirements. For example, a node at the end of the line may experience undervoltage due to increased load, while another node may be approaching its allowable voltage limit due to higher photovoltaic output nearby. Since the series voltage regulation unit applies a common regulation effect to these nodes, increasing the voltage boost according to the undervoltage level of the end node may cause the other node to exceed its allowable limit; conversely, limiting the voltage boost to avoid overvoltage at the other node may leave the end node still undervoltage. Therefore, determining the series regulation amount based solely on the voltage deviation of a single node makes it difficult to determine whether the regulation amount can simultaneously meet the voltage requirements of all controlled nodes.

[0004] When the voltage requirements of multiple nodes cannot be simultaneously met by the same series regulation, parallel power compensation can be used to change the line current and voltage drop of each branch, thereby adjusting the voltage distribution between nodes. However, the upper and lower limits of the allowable voltage of each node may differ, and a decrease in the voltage difference between nodes does not necessarily mean that these nodes can collectively accept a certain series regulation. If parallel regulation is based solely on the voltage deviation of a single node or the voltage difference between nodes, there may still be situations after regulation where the common series regulation cannot simultaneously meet the requirements of multiple nodes, leading to limitations in subsequent series regulation or the need to readjust the parallel power.

[0005] Therefore, the technical problem that this invention needs to solve is: when the same series voltage regulation unit acts on multiple downstream controlled nodes, how to determine whether the requirements of each node for the common series regulation amount are compatible with each other, and when the requirements conflict with each other, how to enable the parallel power regulation to handle the voltage state of the node that causes the conflict. Summary of the Invention

[0006] The purpose of this invention is to address the shortcomings of existing technologies by providing a method for dynamic voltage adjustment based on a hybrid flexible suspension, thereby solving the technical problems mentioned in the background section.

[0007] To achieve the above objectives, the present invention provides the following technical solution:

[0008] A method for dynamic voltage regulation based on a hybrid flexible suspension includes the following steps:

[0009] S1. Obtain the current voltage, allowable voltage range, and executable voltage regulation range of multiple controlled nodes effectively downstream of the same series voltage regulation unit. Based on the current voltage and allowable voltage range of each controlled node, form a series regulation allowable range for the same common series voltage regulation amount.

[0010] S2. Find the common allowable range of each series regulation allowable range, and intersect the non-empty common allowable range of nodes with the executable voltage regulation range to form a common series feasible region; when the common allowable range of nodes is empty, determine the maximum lower limit value and the minimum upper limit value.

[0011] S3. Determine the conflict nodes corresponding to the maximum lower limit and the minimum upper limit, and form the constraint boundary difference component based on the difference between the two.

[0012] S4. When there are node constraint conflicts, determine the candidate parallel power adjustment amount that reduces the constraint boundary difference component within the executable range of the parallel power compensation unit; when a valid candidate is obtained, control the parallel power compensation unit to change the line power flow, and update each series adjustment allowable range, node common allowable range, and common series feasible range according to the adjusted actual node voltage; when the common series feasible range returns to non-empty, enters the series capacity limited state, no valid candidate is obtained, or the actual adjustment does not produce effective improvement, stop the addition of parallel adjustment in this round.

[0013] S5. When the common series feasible region is not empty, determine the common series voltage adjustment amount through the pre-execution verification, control the series voltage adjustment unit to implement common voltage adjustment, and confirm whether each controlled node is within the corresponding allowable voltage range based on the actual node voltage after adjustment.

[0014] The beneficial effects of this invention are as follows:

[0015] This invention converts the voltage requirements of multiple controlled nodes into an allowable range for the same series regulation amount, and evaluates the parallel power regulation amount using constraint boundary difference components. This allows parallel regulation to directly target node constraint conflicts that limit common series regulation, reducing the need for repeated adjustments based solely on the voltage deviation of a single node. It separately determines the common allowable range and common series feasible range of nodes, distinguishing between constraint conflicts between nodes and insufficient execution capability of the series voltage regulation unit. This avoids mistaking the inability of equipment to execute the common regulation amount as node constraint conflicts, reducing unnecessary parallel regulation resulting from this.

[0016] This invention combines line power flow calculation with the equipment's executable power range to screen parallel power adjustment amounts, and redetermines the constraint boundaries based on the voltages of all controlled nodes after candidate adjustment. This avoids only improving the original conflicting nodes while ignoring the new constraints formed by other nodes, and improves the matching degree between the candidate adjustment amount and the current line state.

[0017] After parallel power regulation, the actual node voltage is re-acquired, and the common series feasible region is updated accordingly. When the actual regulation does not produce effective improvement, the current round of new parallel regulation is stopped to avoid continuously issuing control commands based solely on the prediction results, so that subsequent regulation is based on the confirmed line operating status.

[0018] This invention selects a common series voltage adjustment amount that has been verified before execution within the common series feasible region, and confirms whether each node meets the allowable voltage range based on the actual node voltage after adjustment, thus avoiding directly assuming that all node voltages are qualified after the initial interval screening result or the completion of the control command. Attached Figure Description

[0019] Figure 1 This is a flowchart of a voltage dynamic adjustment method based on a hybrid flexible suspension according to the present invention. Detailed Implementation

[0020] 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.

[0021] Example: Figure 1 As shown, this embodiment provides a method for dynamic voltage adjustment based on a hybrid flexible suspension, including the following steps:

[0022] S1. Obtain the current voltage, allowable voltage range, and executable voltage regulation range of multiple controlled nodes effectively downstream of the same series voltage regulation unit. Based on the current voltage and allowable voltage range of each controlled node, form a series regulation allowable range for the same common series voltage regulation amount.

[0023] S2. Find the common allowable range of each series regulation allowable range, and intersect the non-empty common allowable range of nodes with the executable voltage regulation range to form a common series feasible region; when the common allowable range of nodes is empty, determine the maximum lower limit value and the minimum upper limit value.

[0024] S3. Determine the conflict nodes corresponding to the maximum lower limit and the minimum upper limit, and form the constraint boundary difference component based on the difference between the two.

[0025] S4. When there are node constraint conflicts, determine the candidate parallel power adjustment amount that reduces the constraint boundary difference component within the executable range of the parallel power compensation unit; when a valid candidate is obtained, control the parallel power compensation unit to change the line power flow, and update each series adjustment allowable range, node common allowable range, and common series feasible range according to the adjusted actual node voltage; when the common series feasible range returns to non-empty, enters the series capacity limited state, no valid candidate is obtained, or the actual adjustment does not produce effective improvement, stop the addition of parallel adjustment in this round.

[0026] S5. When the common series feasible region is not empty, determine the common series voltage adjustment amount through the pre-execution verification, control the series voltage adjustment unit to implement common voltage adjustment, and confirm whether each controlled node is within the corresponding allowable voltage range based on the actual node voltage after adjustment.

[0027] This embodiment of the hybrid flexible suspension refers to a flexible power regulation device for power distribution lines, comprising a series voltage regulation unit and a parallel power compensation unit. The AC voltage output of the series voltage regulation unit is connected in series to the power supply path of the controlled node, used to inject regulating voltage into the line. The AC terminal of the parallel power compensation unit is connected in parallel to the configured line node, used to regulate the active or reactive power exchanged between the connection point and the line. The actual connection locations and connection relationships of the two units are used as configuration content for line topology and power flow calculations. The intelligent dispatching system generates series voltage reference values ​​and parallel power reference values ​​based on node measurement data. The corresponding equipment controllers complete the adjustment within their respective execution boundaries and return the actual output and operating status.

[0028] S1 specifically includes the following sub-steps:

[0029] S110. The intelligent dispatching system determines the set of controlled nodes participating in the current voltage regulation judgment and establishes a valid node record corresponding to each controlled node. Controlled nodes should be located within the effective downstream control range of the same series voltage regulation unit; that is, under the current line connection state, the common voltage regulation applied by the series voltage regulation unit can directly act on these nodes along the power supply path. The system reads the current switch status and the configured line connection relationships to confirm the actual power supply path of each node.

[0030] Nodes whose power supply path cannot be confirmed, have been transferred to other lines, or whose current power supply path does not pass through the series voltage regulation unit will not be included in this joint series regulation judgment. For confirmed and valid controlled nodes, obtain the node identifier, current voltage, lower allowable voltage limit, upper allowable voltage limit, data timestamp, and data validity status.

[0031] The current voltage at each node is obtained from the voltage measurement device at the corresponding node and is uniformly expressed as the effective value of the fundamental voltage, consistent with the line voltage regulation control, in volts (V). For cases where three phases implement independent voltage regulation, a separate node record is established for each phase, and voltage data from different phases are not mixed to form the same regulation constraint.

[0032] Before each node voltage measurement device is put into operation, zero-point and range calibration is performed using a standard voltage source. During operation, the calibrated measurement values ​​are used. During the commissioning and configuration phase, the intelligent dispatching system determines a unified effective time window based on the actual node sampling period and the maximum allowable transmission delay of the communication link. This effective time window should be less than or equal to one dispatching control cycle, and the node data entering the same adjustment judgment should all correspond to the effective line status within that control cycle.

[0033] During runtime, the system checks the timestamps of each node's data according to the valid time window. If data exceeds the valid time window, the corresponding node record is marked as invalid, and the voltage value from the previous cycle is not used to replace the current value. If no valid controlled node meets the requirements in the current cycle, no new adjustment judgment is made, and the system waits for the node data to be obtained again in the next cycle.

[0034] The system simultaneously reads the operating status of both the series voltage regulation unit and the parallel power compensation unit. The series voltage regulation unit should at least be in a state where it can accept voltage regulation commands, and its device controller should be able to provide the current executable voltage regulation boundary. The current active and reactive power outputs and executable power boundaries of the parallel power compensation unit serve as the basis for subsequent adjustments when node constraint conflicts occur. When any device is locked out or fails to exit, new control commands are not generated using the historical executable boundaries of the failed device.

[0035] For nodes still within the current controlled power supply path, invalid voltage data or abnormal allowable voltage range configuration only indicates that the node is temporarily unable to participate in the calculation, not that it is no longer subject to series voltage regulation. If any of the above situations exist among the currently configured controlled nodes, or if it cannot be confirmed whether a controlled node has exited the current power supply path, the current round of new series and parallel regulation will be suspended. Only when it is confirmed that a node has exited the controlled power supply path will it be removed from the current set of controlled nodes. Regulation judgments will be re-formed after the necessary node records are restored to complete validity.

[0036] Node records participating in the same judgment should correspond to the same line topology and the same group of completed device reference values. If a device reference value or line connection status changes, node records from before and after the change are not mixed. The system uses a unified time base, taking the later of the device completion time and the most recent topology change time as the starting time for re-acquisition, and checking the time attribution of records in conjunction with the clock synchronization error of the measuring device. If state consistency cannot be confirmed, re-acquisition is required; records are not considered eligible for joint calculation simply because they are within the same scheduling cycle.

[0037] S120. For each valid controlled node, determine its current allowable voltage range and obtain the common voltage regulation range that the series voltage regulation unit is allowed to perform under the current operating state. The allowable voltage range is jointly determined by the line voltage operating limit and the access equipment voltage limit corresponding to the current operating state of the node. When multiple limits are valid simultaneously, the largest allowable lower voltage limit among the various limits is taken as the allowable lower voltage limit of the node, and the smallest allowable upper voltage limit is taken as the allowable upper voltage limit of the node.

[0038] If the lower limit of the allowable voltage obtained is greater than the upper limit of the allowable voltage, it indicates that the current constraint configuration of the node is contradictory. The node will be marked as having an abnormal constraint configuration, and this abnormal range will not be used to form a series regulation allowable range. The upper and lower limits of the node's allowable voltage use the same effective value caliber and unit as the current voltage of the node, and data from phase voltage, line voltage, or different statistical calibers will not be mixed.

[0039] The current executable voltage regulation range of the series voltage regulation unit is given by the equipment controller based on the actual operating status, and does not directly adopt the equipment's rated maximum output value. The equipment controller determines the minimum and maximum common voltage regulation that can be executed in this cycle based on the current allowable output voltage, the operating status of the power devices, and existing protection limits. Positive values ​​indicate common voltage boosting for the effective downstream control range, while negative values ​​indicate common voltage bucking. The intelligent scheduling system only uses the executable range verified by the equipment controller's status and does not expand the boundaries in the upper-level control.

[0040] Throughout this paper, the common signed voltage increment acting on the effective downstream node of the same series voltage regulation unit is uniformly denoted as . The unit is V. This indicates the additional common voltage regulation needed based on the current node voltage state, rather than the absolute voltage reference value already output by the series converter.

[0041] The series voltage regulation unit uses the phase of the fundamental voltage on its power supply side as a synchronization reference, converts the injected voltage to the line side, and represents it as a signed equivalent series voltage output along this reference direction. Injections in the same direction are taken as positive, and injections in the opposite direction are taken as negative. When a coupling transformer is present, the line-side conversion is performed according to the actual turns ratio.

[0042] The equipment controller first determines the absolute upper and lower limits of the equivalent series voltage output based on the current operating conditions, and then subtracts the current actual equivalent output from each to obtain the allowable common voltage regulation increment upper and lower limits. This increment range should also meet the voltage change limit that the equipment can achieve within the allowable response time. The boundaries provided to the intelligent scheduling system uniformly adopt an incremental approach, and the absolute output boundary of the equipment is not directly used as the increment boundary.

[0043] The equivalent quantities mentioned above are used to establish a unified regulation coordinate system and do not imply that the effective voltage values ​​of each downstream node will change exactly the same under all operating conditions. The resulting intervals are used for initial screening, and the actual regulation quantities should be confirmed according to the AC power flow verification and measured feedback rules described later.

[0044] S130, the intelligent scheduling system converts the allowable voltage constraint of each effectively controlled node into an adjustment variable for the same common series voltage. The allowable range for series regulation. Starting with the node voltage actually measured in the current scheduling cycle, an initial screening model is established using the common signed voltage increment to compare the constraint requirements of different nodes for common boost or common buck.

[0045] The common increment in this model is a unified variable of organizational constraints and is not directly equivalent to the identical effective value changes of each node in an actual AC line. The node common allowable interval and the common series feasible region represent the node compatibility condition and equipment capability condition in this screening model, respectively. Explanations regarding the cancellation of common increments in the constraint boundary difference components also apply only to this screening model.

[0046] Before actual execution, the selected series regulation should be treated as a change in the series injected phasor and verified using an AC power flow model that includes line impedance, node power, and current equipment output. The regulation should not be issued if the verification fails. After execution, the result should be confirmed based on the remeasured node voltage; the initial screening interval not being empty should not be used as a substitute for the actual voltage qualification judgment.

[0047] For the i-th effective controlled node, its series regulation allowable interval is determined according to the following formula:

[0048]

[0049] in, This represents the lower limit of the allowable regulation of the common series voltage proposed by the i-th controlled node, in V; This indicates the corresponding maximum allowable value, expressed in V. This represents the effective voltage value of the node during the current scheduling cycle, in volts (V). and These represent the lower and upper limits of the allowable voltage for that node, respectively, both in volts (V). The node voltage and allowable voltage range are derived from the aforementioned valid node records.

[0050] When the current voltage of the node is lower than the allowable lower limit A positive value indicates that the series regulation should at least achieve the corresponding boost; when the node approaches the allowable upper limit, The voltage is correspondingly reduced to limit further voltage increases; when the current voltage is within the allowable range, the resulting interval can contain both negative and positive values, indicating that the node can accept a certain range of common voltage reduction or common voltage increase. The intelligent scheduling system forms a list of all effective nodes according to the same rules. And save node identifiers, , Current voltage, allowable voltage upper and lower limits, data timestamp, and validity status.

[0051] The node's allowed range is not truncated here according to the device's executable range, so that it can be determined later whether there is a common allowed adjustment amount between nodes and whether the device currently has the ability to execute the adjustment amount.

[0052] S2 specifically includes the following sub-steps:

[0053] S210, the intelligent scheduling system reads the series regulation allowable intervals of all valid controlled nodes and compares the lower and upper endpoints of each interval. Since each interval uses the same common series voltage regulation variable... As the independent variable, and with units uniformly set to V, interval intersection can be directly performed. The system starts from all valid controlled nodes. Select the maximum value from all. The minimum value is selected and used as the lower and upper boundaries when multiple nodes jointly accept the same series adjustment amount.

[0054] The common allowable interval of nodes is determined by the following formula:

[0055]

[0056] in, Indicates the common allowed range of nodes; This represents the maximum lower limit of the allowable range for series regulation of all effective controlled nodes, expressed in V; This represents the minimum upper limit of the allowable range for series regulation of all effective controlled nodes, expressed in V; This indicates that there is no publicly allowed interval for nodes.

[0057] If multiple nodes have the same Retain all corresponding node identifiers; if multiple nodes have the same identifier... Similarly, all corresponding node identifiers are retained. Nodes with the same boundary value have equal constraint effects on the current common allowed interval and are not arbitrarily deleted according to node number or data arrival order. The validity status of each node record is checked again before calculation. Records that have expired due to data timeout, changes in line connection relationships, or abnormal constraint configurations do not participate in the interval calculation for this period. If the set of valid controlled nodes is empty, no interval is formed. It will not proceed to the subsequent conflict assessment.

[0058] S220, according to and The relationship between them distinguishes between node constraint compatibility and node constraint conflict. When This indicates that there exists at least one common series voltage regulation that can simultaneously fall within the allowable range of all effectively controlled nodes, and the voltage constraints of the nodes themselves are compatible with each other. Critical Case It still belongs to the node's common allowable interval being non-empty; at this point, the common allowable interval degenerates into a definite adjustment value. When When this occurs, it indicates that there is no common series voltage regulation that can simultaneously satisfy the voltage constraints of all valid controlled nodes. This state is recorded as a node constraint conflict state and saved. , And the node identifiers that generate the corresponding boundaries.

[0059] For the case where the common allowed interval of the nodes is not empty, The intersection of this intersection with the currently operable voltage regulation range of the series voltage regulation unit forms a common series feasible region:

[0060]

[0061] in, This represents the feasible region of common concatenation, measured in V. and These represent the minimum and maximum common voltage regulation increments that the series voltage regulation unit is allowed to execute in the current scheduling cycle, respectively, both in volts, and are provided by the series voltage regulation unit device controller.

[0062] like If not empty, then any of the adjustment values ​​satisfies the multi-node voltage constraints in the initial screening model and the currently provided incremental boundaries of the series equipment. Whether it can be actually executed still needs to be checked through the AC power flow verification and equipment execution conditions described later. If Not empty but If empty, then in this screening model, the node's allowed intervals have a common intersection, but this intersection does not overlap with the incremental range currently provided by the serial device. This state and the node constraint conflict state are recorded separately, and the constraint boundary difference component is not generated using the insufficient device capacity state.

[0063] S230. For cases where the common serial feasible region is not empty, the intelligent scheduling system saves... The upper and lower endpoints, the currently valid set of controlled nodes, and each node The executable range of the equipment and its corresponding time identifier are used as the series feasible state for the current scheduling cycle. The common series feasible region is used to determine the actual common series voltage regulation amount, and independent series regulation commands are no longer generated for each individual node.

[0064] For cases where the common allowed range of a node is empty, retain , This set of data includes the corresponding set of boundary nodes and the valid node records used to form the current interval. This data serves as the direct input for subsequent extraction of constraint conflict nodes and calculation of constraint boundary difference components. If there are multiple nodes with the same maximum lower limit or multiple nodes with the same minimum upper limit, all of them are retained, and a unique node is not fixed here.

[0065] When the common allowable interval of nodes is not empty but the common series feasible region is empty, the current state is recorded as a series capacity limited state. This state indicates that all controlled nodes can jointly accept a certain series adjustment amount, but this adjustment amount is not within the current executable range of the equipment. At this time, conflicting nodes are not extracted, constraint boundary difference components are not formed, and new parallel power compensation is not initiated on the grounds of node constraint conflict. The intelligent scheduling system does not issue series adjustment commands that exceed the current executable range of the equipment. After obtaining the node voltage and equipment operating status again in the next scheduling cycle, the common allowable interval and common series feasible region of nodes are re-formed.

[0066] If changes in equipment operating conditions or node status cause the two to intersect again, the system transitions to a series-connected feasible state; otherwise, it remains in a series-connected capability-limited state.

[0067] S3 specifically includes the following sub-steps:

[0068] S310. Under node constraint conflict conditions, the intelligent scheduling system, according to... , The set of nodes and their corresponding nodes determine the boundary nodes of the current constraint conflict. This will reach the maximum lower limit value. The controlled node is designated as the first conflict node candidate, which will reach the minimum upper limit value. The controlled node is denoted as the second conflict node candidate. The first conflict node corresponds to the boundary among all valid nodes that sets the highest and lowest requirements for the common series adjustment amount, and the second conflict node corresponds to the boundary among all valid nodes that sets the lowest and highest allowable values ​​for the common series adjustment amount. Both of them jointly limit the boundary conflict that results in the node's common allowable interval being empty.

[0069] Only one node reached When this happens, the node directly becomes the first conflict node; only one node reaches the agreement. When a node is directly designated as the second conflict node, it is not arbitrarily deleted based on node number or physical distance, but rather the candidate set is retained. In subsequent expressions involving the first conflict node A and the second conflict node B, A represents any node reaching the current... B represents any boundary node that reaches the current boundary node. Boundary nodes.

[0070] Since the parallel nodes correspond to the same boundary value, selecting any one of the nodes to represent the current boundary difference will not change the result. The numerical value; when evaluating candidate parallel power adjustment, the particle swarm optimization algorithm still recalculates for all effective controlled nodes. , , and A and B will not be permanently fixed as the only constraint nodes in the future.

[0071] Before a conflict node record is generated, the same data time base as the node's common allowed interval continues to be used. If a conflict node record is generated... or If a node record has exceeded the valid time window, or if the power supply path has changed, the current conflict state becomes invalid, and the interval judgment is re-performed using the updated complete set of valid nodes.

[0072] S320. A constraint boundary difference component is formed based on the maximum lower limit and the minimum upper limit, which is used to represent the common series regulation gap that has not yet been eliminated between the current node constraints. This difference component is not a simple difference between the current voltages of the two nodes, but rather the constraint interval formed by the two boundary nodes on the same series regulation variable under their respective allowable voltage limits:

[0073]

[0074] in, This represents the constraint boundary difference component, in units of V; This represents the current effective voltage value of the first conflict node A, in volts (V). This indicates the lower limit of the allowable voltage for A; This represents the current effective voltage value of the second conflict node B; This represents the upper limit of the allowable voltage for B, in volts (V). All the above data are derived from the records of valid nodes within the same scheduling cycle that form the current allowable range for series regulation.

[0075] Current processing only Executed in time, therefore Its value represents the difference between the minimum common series increment required for the first conflicting node to meet the lower allowable voltage limit and the maximum common series increment acceptable for the second conflicting node not to exceed the upper allowable voltage limit. Subsequently, if the actual line condition causes... The decrease indicates that the boundary interval causing the common series adjustment to have no solution has decreased; when recalculated... At that time, the node's public allowed interval is restored.

[0076] The common direct voltage increment applied to the effective downstream node by the same series voltage regulation unit will simultaneously change the endpoints of the allowable intervals corresponding to A and B, and its direct common effect is... They cancel each other out. This relationship is for illustrative purposes only. For the state characteristics of the common direct voltage increment, it is not assumed that the line current, load power, and line voltage drop remain unchanged after the series operation. The aforementioned indirect changes are still recalculated based on the new actual node state.

[0077] S330, the intelligent scheduling system organizes the current constraint boundary difference component and the node constraints that form that difference component into a constraint conflict state record. The record includes the current... , , The first set of candidate conflict nodes, the second set of candidate conflict nodes, and all valid controlled nodes. The record includes: current voltage and allowable voltage limits for each node, node data time stamp, and validity status. The allowable range of all valid nodes is used to evaluate whether the candidate parallel power adjustment can reduce node constraint conflicts. The allowable range of all valid nodes is used to determine whether the candidate adjustment only improves the original boundary node, but causes other nodes to form new and stricter constraints.

[0078] When parallel conflicting nodes exist, the candidate set remains unchanged before entering the solution for parallel power regulation. After power flow calculation for any candidate parallel power regulation, the allowable ranges for each node are regenerated based on the adjusted node voltages, and the maximum lower limit and minimum upper limit are re-compared. If other nodes replace the original boundary nodes as new... or If the source is determined, the candidate quantity will be evaluated based on the updated global constraint state, and the original nodes A and B will no longer be used as the sole evaluation objects.

[0079] If, after a constraint conflict state is formed but before the parallel power adjustment is issued, the node data has timed out, the line connection status has changed, or the executable status of the parallel power compensation unit has changed, then the expired constraint conflict record will not be used to generate control instructions. After re-acquiring the current line status and node data, a new constraint state will be formed according to the same rules. Valid constraint conflict state records serve as direct constraint inputs for the particle swarm optimization algorithm.

[0080] S4 specifically includes the following sub-steps:

[0081] S410, the intelligent dispatching system, under effective node constraint conflict conditions, obtains the current line power supply topology, the corresponding line impedance parameters, the current power supply side voltage, the active and reactive power status of each node, and the current actual output and executable power range of the parallel power compensation unit. The line connection relationship adopts the effective power supply topology determined by the current switch state.

[0082] The line impedance parameters are taken from the line parameter table that matches the topology version. The branch resistance and reactance in the parameter table are established based on the conductor type, line length, and equipment parameters, and are verified using the steady-state voltage, current, and power measurements of the corresponding branches when the device is put into operation. After the line topology changes, only the parameter version that matches the current topology is used.

[0083] The power supply side boundary for power flow calculation uses the measured fundamental voltage of the series unit power supply side, with its phase angle as a reference. The current injected voltage phasor of the series unit is included at the actual series connection location, without omitting the current series output or repeatedly superimposing it on the boundary voltage that already includes the effect of that output. The series connection location, parallel compensation connection nodes, and the connection relationships of each branch are all determined by the equipment configuration consistent with the current topology.

[0084] Parallel power compensation alters the power exchange at the compensation access node, causing changes in the branch current and voltage drop across the line impedance, thereby altering the voltage of each controlled node. The voltage change at each node is determined by the actual access location, branch connection relationship, line impedance, and current power distribution, and is not pre-considered as identical voltage increments. When the allowable voltage boundary and the first and second conflicting nodes remain unchanged, if the voltage rise at the first conflicting node is greater than that at the second conflicting node, the difference between the maximum lower limit and the minimum upper limit decreases; the voltage rise is calculated by subtracting the pre-adjustment voltage from the adjusted voltage, and is negative when the voltage drops. When candidate adjustments cause changes in conflicting nodes, the maximum lower limit and minimum upper limit are re-determined based on all effective controlled nodes, without using the comparison results of the original conflicting nodes.

[0085] Therefore, whether parallel power regulation can reduce constraint conflicts should be judged based on the current access configuration and the candidate power flow results within the executable range of the equipment, and the fact that the parallel unit has a non-zero regulation capacity is not a sufficient condition for eliminating conflicts. Only when a recovery candidate or an improvement candidate is obtained according to the candidate evaluation rules described later will a parallel regulation command be formed; if no such candidate is obtained in this search, it will be handled according to the established stopping rules and will not be interpreted as node voltage recovery having been achieved.

[0086] The active power P and reactive power Q of a node represent the net power consumption after combining the local load and local distributed generation, with absorption from the line considered positive and transmission to the line considered negative. Bidirectional power measurement results of the corresponding local access branch are preferred; the trunk transmission power, which includes the power of multiple downstream nodes, is not directly used as the power of a single node. When calculating power based on voltage and current, the power direction and voltage-current phase relationship should be obtained simultaneously, not just the reactive power direction determined by the absolute value of the power factor. Candidate regulation commands are not generated using this state when valid node power data is lacking.

[0087] Parallel power compensation units are represented by independent injection terms, with injection into the line considered positive. Local net power consumption does not include this independent injection term. When the measurement result already includes the current compensation effect, the local net power consumption is first restored according to the same notation convention, and then separately included in the compensation output to avoid double counting.

[0088] Each particle represents a candidate active and reactive power increment relative to the current actual output of the parallel unit. The candidate increments are added to the current actual output to form a candidate absolute output, which is then used to check the active, reactive, and apparent power boundaries. When only reactive power regulation capability is available, the active power increment is fixed at zero. The candidate absolute output only applies to configured compensation access nodes.

[0089] During a candidate solution iteration, the local net power consumption of each node is used as constant P and Q inputs. Node currents are calculated based on the node complex power and node voltage phasors. Branch currents are aggregated from the end towards the power source, and then the node voltage phasors are updated from the power source towards the end based on branch impedances. Series injection voltage is included when passing through series connection points. The magnitude of the updated phasors is used as the effective value of the candidate node voltage. The initial voltage value uses the current measured amplitude and is initialized with the phase angle on the power source side. If the voltage falls below the configured undervoltage protection limit, the candidate calculation is stopped, and the undervoltage value is not used as the division input for current calculation. When calculating in V, A, and Ω, kW and kvar are first converted to W and var.

[0090] When using single-phase equivalent calculation, it is only applicable to single-phase lines or three-phase lines that can be equivalent under symmetrical conditions, and the total three-phase power is converted to the same single-phase caliber. For three-phase lines where phase-to-phase coupling cannot be ignored, a three-phase power flow model that retains the phase-to-phase and neutral line connection relationships should be used; if no corresponding model is configured, it should not be directly treated as an independent single-phase line.

[0091] Before candidate searching, the reference node voltage is calculated based on the current actual output of the equipment and compared with the measured voltage under the same condition. The allowable model deviation for each node is determined based on the measurement accuracy and the model residuals during commissioning, and is verified by records covering the load range used. If the reference deviation of any node exceeds its allowable value, the topology, power data, and parameters are checked first, and the model is no longer used to generate control commands.

[0092] Repeat the calculation until the maximum node voltage difference between two consecutive calculations does not exceed the power flow convergence tolerance. This convergence tolerance is selected with the node voltage measurement resolution as the upper limit during commissioning, and the feasibility of continuing to reduce the tolerance without changing the candidate regulation is confirmed through repeated calculations. Candidate particles that have not converged after exceeding the allowable calculation time of the current control cycle are marked as invalid.

[0093] S420, the particle swarm optimization algorithm searches for candidate power adjustment values ​​within the current executable power range of the parallel power compensation unit that can reduce the constraint boundary difference components and restore the common series feasibility conditions. During initialization, the positions of each particle are distributed within the effective active and reactive power adjustment range confirmed by the device controller, and candidate positions are not generated outside the device's allowable boundaries.

[0094] The initial particle velocity is limited according to the adjustable range of the corresponding power variable to keep the position update within the evaluable range of the equipment. The number of particles, inertia coefficient, individual learning coefficient, group learning coefficient, and maximum number of iterations are determined during the commissioning of the device. During commissioning, known operating data covering the normal load, photovoltaic back-feed, and allowable load variation range are repeatedly solved to select parameter combinations that can stably obtain the same feasible candidate region within the allowable computation time of one scheduling control cycle; if increasing the number of particles or the number of iterations no longer changes the feasible candidate region, the computational scale will not be expanded.

[0095] Each iteration updates particle velocity and position based on the particle swarm optimization algorithm's inertia term, individual historical best position, and swarm historical best position. When a candidate position crosses the device's executable boundary, the corresponding power component is constrained to that boundary before evaluation. For each valid particle, the voltages of all controlled nodes after candidate adjustment are obtained through power flow calculations. Based on these candidate node voltages, the voltages of each node are recalculated according to the same rules described above. , , , The common allowed interval of nodes and the candidate constraint boundary difference components.

[0096] Candidates whose absolute power output exceeds the equipment boundary, whose power flow calculation fails to converge, or whose candidate state violates the configured line and equipment protection limits are not considered executable candidates. For candidates that pass the check, the maximum lower limit, minimum upper limit, and their difference are recalculated based on all valid nodes. This candidate difference is allowed to be equal to or less than zero, and its value is not restricted by the fact that the difference component in the current actual conflict state is greater than zero.

[0097] If a node's common allowed range intersects with the executable range of a serially connected device, it is considered a recovery candidate. If a node's common allowed range is still empty, but the candidate difference component is smaller than the current actual difference component, it is considered an improvement candidate. If a node's common allowed range is no longer empty, but the common serially connected feasible range is still empty, it is not considered a recovery or improvement candidate for this round of execution, to avoid prematurely stopping the original conflict processing due to transitioning to a serially connected limited state after execution.

[0098] Individual and group historical best positions use the same evaluation rules: recovery candidates take precedence over improvement candidates; within the same category, candidates with smaller difference components are preferred; if the difference components are the same, candidates with smaller sums of absolute power increments are preferred. Only particle positions that meet the conditions for recovery or improvement are included in the update of their corresponding individual and group historical best positions. For particles that pass the equipment boundary, power flow convergence, and protection limit checks but do not yet meet the conditions for recovery or improvement, their positions are not updated to individual or group historical best positions, nor can they be directly output as adjustment commands, but they can still continue searching according to the established particle velocity and position update rules. When a valid individual historical best position has not yet been formed, the velocity update of the corresponding particle does not use the guiding term of the individual historical best position; when a valid group historical best position has not yet been formed, the velocity update of each particle does not use the guiding term of the group historical best position. After the corresponding historical best position is formed, it participates in subsequent velocity and position updates according to the established evaluation rules.

[0099] The search can end when a recovery candidate is found. If the maximum number of iterations or the computation time limit for this search is reached, and there are no recovery candidates but there are improvement candidates, the candidate with the smallest difference component is output as the restricted adjustment quantity; if there are no improvement candidates, the search stops and no new parallel adjustment instructions are generated. This result only indicates that no executable improvement quantity was obtained in this finite search, and does not indicate that no other solution exists within the device scope.

[0100] The parallel power compensation unit maintains the currently confirmed safe operating point. The system records that there are no effective improvement candidates under the current operating conditions, and re-performs constraint judgment and search after effective updates to node voltage, line connection status, or equipment capability, without expanding the scope of the problem. The number of candidates is forcibly adjusted.

[0101] S430. For the valid candidate parallel power adjustment increments output by the particle swarm optimization algorithm, the intelligent scheduling system forms a new power reference value based on the current actual active and reactive power outputs of the parallel power compensation units. The new power reference value replaces the upper-level reference value that has not yet been completed in the current scheduling cycle, and does not continuously accumulate multiple candidate increments that have not yet been realized. After receiving the new power reference value, the equipment controller checks the current active, reactive, and apparent power boundaries again.

[0102] When the reference value is still within the allowable range of the device, it shall be executed according to the power change rate allowed by the device itself; when the device capability changes during the transmission of instructions, the device controller shall limit it according to the new safety boundary and return the current actual output and the new executable range to the intelligent scheduling system.

[0103] After the parallel power compensation unit completes its operation, it reacquires the effective voltage of all controlled nodes and the actual P and Q outputs of the parallel units. Completion is primarily confirmed by feedback from the equipment controller; if no feedback is available, the deviation between the actual output and the confirmed reference value is continuously checked within the equipment's specified stable observation time. A stable output state is confirmed if this deviation does not exceed the allowable value determined based on the equipment's tracking accuracy, and if the equipment does not report current limiting, blocking, or faults. The allowable response time is configured based on the equipment response time and the allowable communication delay. If the response time limit is reached but the response is not achieved, subsequent adjustments in this round are stopped, and the equipment controller handles the situation according to local protection rules; response timeout is not considered completion.

[0104] Based on the measured node voltages after execution, all allowable intervals, maximum lower limits, minimum upper limits, and constraint boundary difference components are recalculated, without using predicted voltages to replace actual measurements. If node constraint conflicts still exist, the actual difference components are compared with the actual difference components before the action. Only when the node set, allowable voltage boundaries, and topology remain unchanged, and the actual reduction exceeds the range that can be explained by the measurement errors before and after, will the search continue with the new actual state.

[0105] The comparison tolerance is the sum of the upper bounds of the voltage measurement errors involved in the two calculations; when calculating based on the unified maximum node voltage error upper bound, four times that upper bound is taken as the conservative tolerance. The error upper bound is determined by the accuracy of the measuring device and the calibration results. If no improvement exceeding this tolerance is observed in practice, or if the conflict widens, the current round of continuous adjustment is stopped, the deviation between the prediction and the actual measurement is recorded, and the model input and parameters are rechecked. The model can only be restarted after it has passed the benchmark verification again.

[0106] When the common allowable range of a node is restored to non-empty, its intersection with the current executable range of the series-connected device is calculated. If the common series feasible range is not empty, further parallel adjustments for this conflict are stopped, and the actual node voltage, actual output of the parallel unit, and time stamp are saved. If the common series feasible range is still empty, the system enters a series capability-limited state and is not recorded as having successfully restored voltage. In the event of device malfunction or topology change, the prediction and before-and-after improvement comparisons become invalid, and subsequent processing is based on the reconfirmed actual state.

[0107] The confirmed safe operating status referred to in this manual is the state where the actual output of the equipment has received feedback and meets the equipment's protection and capacity limitations at that time, and is not equivalent to the voltage of all nodes being qualified. Historical safe operating status is used for recording and comparison, and cannot be directly used as a recoverable control target when current conditions have changed.

[0108] S5 specifically includes the following sub-steps:

[0109] After obtaining a valid non-empty common series feasible region, the S510 intelligent scheduling system reads the lower and upper endpoints of this region, the currently valid set of controlled nodes, the corresponding node voltage records, and the current executable range of the series voltage adjustment unit. The common series feasible region can be obtained either by directly intersecting the common allowable interval of the nodes with the executable range of the equipment, or it can be recovered based on the remeasured node voltages after the parallel power compensation has completed the actual adjustment. In the latter case, only the common series feasible region formed by actual measurement is used, and the series control command is directly generated without using the particle swarm optimization algorithm to predict the voltage.

[0110] The feasible area for public connection is denoted as First, the common series adjustment increment with the smallest absolute value within the interval is selected as the initial candidate and determined according to the following formula; if the initial candidate passes the pre-execution verification, it becomes the current control variable; if it fails, the executable values ​​of other devices within the interval are checked according to the rules described later:

[0111]

[0112] in, This indicates the initial common series voltage regulation candidate determined according to the common series feasible region, in V; and These represent the lower and upper endpoints of the common series feasible region, respectively, both in units of V. When the interval contains 0, the initial candidate is 0; when the entire interval is on the positive side, the initial candidate is its smallest positive value; when the entire interval is on the negative side, the initial candidate is the smallest negative value in absolute terms; when the common series feasible region degenerates into a single point, the initial candidate is that point. If the initial candidate passes the pre-verification, it becomes the final common series adjustment amount; if it fails, the final common series adjustment amount is determined according to the candidate checking rules described later, and the system is updated. .

[0113] Before determining the adjustment amount, recheck the data time stamp, line connection status, and current operational range of the equipment within the common series feasible area. If any basic state has changed and caused the original interval to become invalid, the original interval should not be used. The common serial feasible area is re-formed based on the current node status.

[0114] Before issuing the series control input, the aforementioned AC power flow model should be used for pre-execution verification. Even if no parallel control occurs in the current cycle, the required valid input for the model should still be obtained, and the current actual operating point should be confirmed to have passed the benchmark verification.

[0115] The selected increment is superimposed onto the current actual equivalent output of the series unit, forming a candidate injected voltage phasor according to a unified synchronization reference. The voltage of each node is recalculated using the current actual output of the parallel unit, effective node power, and line parameters, and the current equipment execution conditions are checked. For each node, the predicted voltage is extended upwards and downwards by the node's calibrated allowable model deviation. The selected adjustment is only issued if the extended voltage range is entirely within the node's allowable range and the equipment execution conditions are met; equal endpoints are treated as meeting the constraints.

[0116] If the initial candidate fails verification, it is not executed directly, nor is the check of the current interval terminated based on this. The system reads the voltage reference value resolution of the series device controller and, using the current actual output as a reference, determines the candidate increments corresponding to the executable absolute reference value of the device within the common series feasible region. In ascending order of absolute increment value, each candidate is verified using the same AC power flow model and deviation propagation rule; verified candidates are not recalculated. After obtaining the first candidate that passes verification, it is determined as the final common series regulation, and the system updates the current range with this final value. This is for use in subsequent equipment reference values.

[0117] If no executable candidate exists, all candidates fail verification, or the maximum allowed computation time for the current control cycle is reached without obtaining a valid candidate, the addition of new series adjustments in this round is stopped. The conditions of the failed nodes or devices are recorded, and a new assessment is conducted after a valid change in the input state or after model verification. When the maximum computation time is reached, only the failed candidate is recorded; this is not interpreted as proof that no other feasible quantities exist. When an interval degenerates into a single point, execution is only performed if the corresponding executable reference value for that point has passed verification.

[0118] S520, intelligent dispatch system will This serves as a common adjustment increment relative to the current actual equivalent output of the series voltage regulation unit. The current actual equivalent series voltage output fed back from the series device controller is read, and... This value is then superimposed on the actual output to form a new series voltage reference value, which is then sent to the device controller. Thus, the common series feasible region determines the amount of common voltage that needs to be added or reduced under the current line conditions, rather than mistakenly sending the increment as the absolute reference value of the device repeatedly.

[0119] After receiving the new series voltage reference value, the equipment controller rechecks the current executable voltage range and the status of protections such as lockout, overcurrent, and overvoltage. If the new reference value still meets the current execution conditions of the equipment, it is converted into the internal voltage control reference of the series converter. If the equipment status changes after the command is generated, causing the original reference value to exceed the new executable boundary, the out-of-limit portion is not executed, and the new actual output and executable range are returned to the intelligent scheduling system. The system re-determines whether the original common series feasible region still holds based on the updated equipment status, without requiring the equipment to bypass its own protection boundaries to execute the upper-level calculation results.

[0120] When AC voltage amplitude regulation is implemented, the series voltage regulation unit uses the phase of the line fundamental voltage as a synchronization reference. Positive common regulation increments correspond to equivalent series injection in the same direction as the line fundamental voltage, while negative common regulation increments correspond to equivalent injection in the opposite direction. The equipment controller gradually reaches the new reference value according to its allowable voltage change rate, without requiring instantaneous jumps in power devices.

[0121] When the common series feasible region has already been restored through parallel power compensation, the intelligent scheduling system maintains the confirmed parallel compensation reference value and does not add compensation commands for the original constraint conflict due to entering the series adjustment phase. When no node constraint conflict occurs, the original parallel compensation reference value is maintained.

[0122] The operational range of series-connected devices should correspond to the parallel operation conditions described above, taking into account their power supply capacity and DC-side operating limitations. When energy coupling exists between two units, their rated capacities are not considered as independent capacities that can be achieved simultaneously. If the device controller cannot confirm that the selected series reference value can be executed together with the current parallel operation conditions, it will not issue the series reference value.

[0123] Internal power adjustments made to maintain DC-side operation are not considered as additional constraint conflict compensation at the upper level, but the resulting changes in the actual parallel output should still be fed back and included in the node status evaluation. If this change exceeds the output tracking allowable range confirmed by the equipment, the original pre-execution verification fails, and the actual output and node voltage should be obtained again before making a judgment. It is no longer assumed that the actual parallel power remains strictly constant.

[0124] After the S530 series voltage regulation unit completes the execution of the new reference value, the intelligent scheduling system reacquires the actual voltage of all valid controlled nodes and judges the voltage regulation status based on the actual measurement results. The reacquired node voltage continues to use the aforementioned fundamental voltage RMS value caliber and unified time effective window, while verifying the current line connection status. The controller's internal reference value, the calculated predicted value, and the issued commands themselves are not used as the basis for determining whether a node has reached the allowable voltage range.

[0125] Each effective controlled node's current voltage is compared to its lower and upper allowable voltage limits. When all effective controlled nodes are within their respective allowable voltage ranges, the current node voltage, the actual equivalent output of the series voltage regulation unit, the actual active and reactive power output of the parallel power compensation unit, the current line connection status, and the data time stamp are saved as the adjusted effective operating state. In the next scheduling cycle, a new node record is formed directly using the newly acquired actual measurement values, without overwriting the actual state with any previous power flow prediction values.

[0126] If any controlled node still exceeds the allowable voltage range, first compare the actual degree of exceeding the limit before and after this series operation. When the node voltage is below the lower limit, the lower limit minus the measured voltage is used as the limit exceeding amount; when it is above the upper limit, the measured voltage minus the upper limit is used as the limit exceeding amount; when it is within the allowable range, the limit exceeding amount is zero. Take the maximum value of the limit exceeding amounts of all controlled nodes and compare it before and after.

[0127] If the node set, allowable voltage boundary, and topology remain unchanged, and the reduction in the maximum over-limit exceeds the sum of the upper bounds of the voltage measurement errors of the two preceding and subsequent measurements, further judgment is allowed based on the new actual node state. If both the common allowable interval and the common series feasible region of the nodes are not empty, the common series adjustment amount is re-determined and pre-execution verification is performed; if the common allowable interval of the nodes is empty, whether to perform parallel adjustment is determined based on the new conflict state; if the common allowable interval of the nodes is not empty but the common series feasible region is empty, the system enters a series capability limited state.

[0128] If the maximum deviation does not decrease beyond the measurement error range or even increases, stop the current round of continuous adjustment, recheck the model and input data, and do not continue to issue instructions repeatedly based on the same mismatch result. When the node set, constraints, or topology changes, do not directly compare the improvement between the original state and the new state; reassess after the new state is complete and effective.

[0129] The series unit uses the voltage tracking accuracy, stability observation time, and response time corresponding to the equipment to determine the completion of the operation according to the aforementioned confirmation principle. In the event of a lockout, fault, or response timeout, the next round of incremental adjustment will not be initiated. The current output will be processed by the equipment controller according to local protection rules, and the system will save the actual feedback state.

[0130] If the particle swarm optimization algorithm fails to find an executable improvement candidate within the current search constraints, it only records the amount of improvement not achieved in this search and does not consider it to have proven that no candidate solution exists. Restarting is conditional upon a identifiable change in the input state or completion of model verification. Voltage changes should exceed the range that can be explained by the measurement errors before and after; topology changes should be based on the confirmed connection relationships; and changes in device capabilities should be based on the boundaries reconfirmed by the controller. If only the timestamp is refreshed and the above states remain unchanged, the same invalid search will not be repeated.

[0131] The above formulas are used to represent the selection rules for node voltage constraint intervals, interval intersection relationships, constraint boundary difference components, and common series regulation quantities, respectively. They are calculated according to the defined symbol meanings and physical units, and are not uniformly interpreted as empirical models formed by data fitting. Voltage, voltage increment, and endpoints of each interval are all expressed in V. When using per-unit values, the same voltage reference is used for similar voltage quantities, and the corresponding physical quantities are restored before forming equipment reference values. Per-unit values ​​are not mixed with actual voltage values ​​in calculations. The actual execution conditions of the initial interval model are confirmed according to the AC power flow verification and measured feedback rules described above.

[0132] Those skilled in the art will recognize that the modules and algorithm steps of the various examples described in conjunction with the embodiments disclosed herein can be implemented in electronic hardware, or a combination of computer software and electronic hardware. Whether these functions are implemented in hardware or software depends on the specific application and design constraints of the technical solution. Those skilled in the art can use different methods to implement the described functions for each specific application, but such implementation should not be considered beyond the scope of this application.

[0133] The above description is merely a specific embodiment of this application, but the scope of protection of this application is not limited thereto. Any variations or substitutions that can be easily conceived by those skilled in the art within the scope of the technology disclosed in this application should be included within the scope of protection of this application. Therefore, the scope of protection of this application should be determined by the scope of the claims.

[0134] In conclusion, the above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A method for dynamic voltage adjustment based on a hybrid flexible suspension, characterized in that, Includes the following steps: S1. Obtain the current voltage, allowable voltage range, and executable voltage regulation range of multiple controlled nodes effectively downstream of the same series voltage regulation unit. Based on the current voltage and allowable voltage range of each controlled node, form a series regulation allowable range for the same common series voltage regulation amount. S2. Find the common allowable range of each series regulation allowable range, and intersect the non-empty common allowable range of nodes with the executable voltage regulation range to form a common series feasible region; when the common allowable range of nodes is empty, determine the maximum lower limit value and the minimum upper limit value. S3. Determine the conflict nodes corresponding to the maximum lower limit and the minimum upper limit, and form the constraint boundary difference component based on the difference between the two. S4. When there is a node constraint conflict, determine the candidate parallel power adjustment amount that reduces the constraint boundary difference component within the executable range of the parallel power compensation unit; when a valid candidate is obtained, control the parallel power compensation unit to change the line power flow, and update each series adjustment allowable range, node common allowable range and common series feasible range according to the adjusted actual node voltage; when the common series feasible range is restored to non-empty, enters the series capacity limited state, no valid candidate is obtained or the actual adjustment does not produce effective improvement, stop the addition of parallel adjustment in this round.

2. The voltage dynamic adjustment method based on a hybrid flexible suspension according to claim 1, characterized in that, Also includes: S5. When the common series feasible region is not empty, determine the common series voltage adjustment amount through the pre-execution verification, control the series voltage adjustment unit to implement common voltage adjustment, and confirm whether each controlled node is within the corresponding allowable voltage range based on the actual node voltage after adjustment.

3. The voltage dynamic adjustment method based on a hybrid flexible suspension according to claim 1, characterized in that, S1 specifically includes: Based on the current line connection relationship, the controlled nodes within the effective downstream control range of the same series voltage regulation unit are identified. The current voltage, allowable voltage range, and data validity status of each controlled node are obtained. Controlled nodes with confirmed power supply paths and valid voltage data are identified as valid controlled nodes participating in the current regulation judgment. For controlled nodes that are still within the controlled power supply path but have invalid voltage data, the current round of new regulation is suspended, and a new regulation judgment is formed after the node record is restored to validity. The allowable voltage range is determined based on the line voltage limit and access equipment voltage limit corresponding to each controlled node, and the executable voltage regulation range formed by the series voltage regulation unit according to the current operating status is obtained. The common series voltage regulation amount is uniformly represented as a signed voltage increment acting on the effective downstream node.

4. The voltage dynamic adjustment method based on a hybrid flexible suspension according to claim 3, characterized in that, S1 further includes: forming series adjustment allowable ranges for the common series voltage regulation amount based on the difference between the current voltage of each controlled node and the corresponding allowable voltage range, and retaining the upper and lower endpoints of each allowable range as inputs for judging the common allowable range.

5. The voltage dynamic adjustment method based on a hybrid flexible suspension according to claim 1, characterized in that, S2 specifically includes: The maximum lower limit and minimum upper limit are determined from the series adjustment allowable intervals of each controlled node, and a common allowable interval for the nodes is formed according to the relationship between the two. The common allowable interval for the nodes is not empty when the maximum lower limit is not greater than the minimum upper limit. When the common allowable interval of a node is not empty, it is intersected with the executable voltage regulation range of the series voltage regulation unit to form a common series feasible region, and the state in which the common allowable interval of a node is empty is determined as the node constraint conflict state. When the common allowable interval of nodes is not empty but the common series feasible region is empty, the current state is determined to be a series capability limited state, and no constraint boundary difference component is formed based on this; when the common allowable interval of nodes is empty, the maximum lower limit value, the minimum upper limit value and the corresponding node information are retained as input for constraint conflict handling.

6. The voltage dynamic adjustment method based on a hybrid flexible suspension according to claim 1, characterized in that, S3 specifically includes: In the case of node constraint conflict, the controlled node that reaches the maximum lower limit value is identified as the first conflict node, and the controlled node that reaches the minimum upper limit value is identified as the second conflict node; when there are multiple controlled nodes with the same boundary value, the corresponding candidate set of conflict nodes is retained. The constraint boundary difference component is formed based on the difference between the maximum lower limit and the minimum upper limit to characterize the degree of constraint conflict between the first conflict node and the second conflict node for the same common series voltage regulation. The constraint boundary difference components, conflict node information, the series regulation allowable range of each controlled node, and the current node voltage are used to form a constraint conflict state. In the subsequent evaluation of candidate parallel power regulation, the maximum lower limit and minimum upper limit are re-determined based on all effective controlled nodes.

7. The voltage dynamic adjustment method based on a hybrid flexible suspension according to claim 1, characterized in that, S4 specifically includes: The system obtains the current line connection relationship, line impedance parameters, power supply side voltage, active and reactive power status of each controlled node, and the executable power range of the parallel power compensation unit. It then applies the candidate parallel power adjustment to the current operating state and performs power flow calculation to obtain the voltage of each controlled node after the candidate adjustment. The particle swarm optimization algorithm is used to search for candidate parallel power adjustment quantities within the executable power range. Based on the node voltage after each candidate adjustment, the series adjustment allowable range, the node common allowable range, the common series feasible range, and the constraint boundary difference component are re-formed. Candidates whose common series feasible range is restored to non-empty are identified as restoration candidates, and candidates whose node common allowable range is still empty and whose constraint boundary difference component is reduced are identified as improvement candidates. Candidate quantities are screened in the order of restoration candidates taking precedence over improvement candidates.

8. The voltage dynamic adjustment method based on a hybrid flexible suspension according to claim 7, characterized in that, S4 also includes: controlling the parallel power compensation unit to execute the selected parallel power adjustment amount, updating the node common allowable range and common series feasible range according to the actual node voltage after execution, and stopping the parallel power adjustment for constraint conflict when the common series feasible range is restored to non-empty.

9. The voltage dynamic adjustment method based on a hybrid flexible suspension according to claim 2, characterized in that, S5 specifically includes: Within the effective common series feasible region, the common series voltage regulation amount is determined according to the priority order of the absolute value of the common series voltage regulation increment from small to large, so that the selected regulation amount simultaneously satisfies the voltage constraints of each controlled node and the current execution capability of the series voltage regulation unit. Based on the current actual equivalent output of the series voltage regulation unit, the common series voltage regulation amount is converted into a new series voltage reference value, and the series voltage regulation unit implements common boost or common buck according to the current executable boundary.

10. A method for dynamic voltage adjustment based on a hybrid flexible suspension according to claim 9, characterized in that, S5 also includes: after the series voltage regulation is completed, the actual voltage of each controlled node is reacquired, and the regulation result is confirmed based on the relationship between the actual voltage and the corresponding allowable voltage range; if there are still nodes that exceed the limit, the series regulation allowable range is re-formed based on the updated actual voltage, and the common allowable range and common series feasible range of the nodes are re-determined.

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