A tower coordinated power supply method and system

Abstract

The present invention relates to the technical field of parallel power supply, specifically to a tower coordinated power supply method and system, comprising the following steps: obtaining tower inverter power supply current, voltage, and total harmonic distortion rate data, calling a photovoltaic control module to record tower node load, using a sliding window to calculate communication load equipment fluctuations, and generating a tower load fluctuation trend value. In the present invention, through current, voltage, and load data analysis, combined with sliding windows to calculate load fluctuation trends, dynamic prediction of power supply demand is achieved, adjacent nodes are screened based on power supply margin and current monitoring, power distribution is optimized, overload or waste is avoided, low-loss solid-state relays are used to switch power supply paths, adjustment efficiency is improved, losses are reduced, load adaptation is optimized in combination with power adjustment, power supply coordination is ensured, current distribution is optimized according to topology, fluctuations are reduced, harmonic distortion rates are calculated for compensation, power quality is improved, harmonic interference is reduced, and power supply stability and energy utilization are improved.

Description

Technical Field

[0001] The present invention relates to the technical field of parallel power supply, and in particular to a tower coordinated power supply method and system. Background Art

[0002] The field of parallel power supply technology includes technical solutions for multiple power supplies to supply power to the load at the same time. Its core content involves the coordinated management, energy distribution, and voltage and current control among multiple power supplies to ensure stable operation of the system. This technical field mainly covers aspects such as power supply parallel topology, power transmission mode, load sharing control, and power supply system protection mechanism. In application, parallel power supply technology can be used to improve power supply reliability, improve power utilization, and enhance load adaptability. It is widely used in power systems, communication base stations, data centers, and various industrial equipment power supply scenarios. In response to different application requirements, this technical field involves methods such as constant voltage power supply, constant current power supply, and adaptive load regulation, and is usually combined with power regulation circuits, current balancing control strategies, and intelligent management systems to achieve efficient collaborative work of power supplies.

[0003] Among them, the tower collaborative power supply method refers to the use of infrastructure such as communication towers to achieve reasonable distribution and sharing of electric energy through parallel power supply technology. The subject of this patent mainly covers power transmission lines based on tower erection, power dispatching and control methods, power supply node selection strategies, current balancing mechanisms, and power outage switching schemes. Its power supply method usually uses power sources from multiple tower sites for energy complementation, uses power management equipment to adjust the power supply path, and optimizes current distribution through load distribution algorithms to ensure load balance at each site. At the same time, the system introduces a power control device to coordinate the energy transmission between the tower power grid and the public power grid, combined with power supply fault detection methods and fast switching technology to improve the stability of power distribution.

[0004] The parallel power supply method lacks real-time perception of load fluctuation trends, resulting in overload of some nodes and idle power of some nodes when the load changes suddenly, and unbalanced power supply allocation. Power supply adjustment relies on fixed rules, which makes it difficult to optimize scheduling according to real-time needs, affecting the adaptability of power supply under load changes. The switching speed of mechanical relays is slow, which can easily cause short-term power supply discontinuity and affect equipment operation. Harmonic processing relies on fixed filtering methods, which makes it difficult to accurately compensate for dynamic harmonic distortion, resulting in impaired power supply quality. The lack of a dynamic control mechanism makes it difficult to effectively coordinate the energy distribution of different power supply nodes, resulting in low power supply efficiency and insufficient stability. Summary of the invention

[0005] The purpose of the present invention is to solve the shortcomings of the prior art and to propose a tower coordinated power supply method and system.

[0006] In order to achieve the above object, the present invention adopts the following technical solution: a tower coordinated power supply method, comprising the following steps: S1: Obtain the current, voltage and total harmonic distortion rate data of the tower inverter output end, call the photovoltaic control module to record the current output value and load status of multiple tower nodes, use the sliding window average to calculate the current fluctuation trend of multiple communication load devices within a fixed period, call the monitoring module to analyze the load change rate, determine the current load status, and generate the tower load fluctuation trend value; S2: Based on the tower load fluctuation trend value, the power supply margin of the multi-tower node is calculated, the current sensor is called to monitor the current change rate, and the current change rate is compared with the set power supply balance threshold to analyze whether there is power supply overload or redundancy, and the relay control unit is called to screen the adjacent tower nodes with the ability to shunt or receive power to obtain the power supply balance adjustment amount; S3: According to the power supply balancing adjustment amount, select the node with the largest power margin among the adjacent tower nodes, call the low-loss solid-state relay to switch the power supply path, calculate the power supply adjustment range of the node, call the power electronic switching module to gradually increase the tower load equipment, allocate the load to the new power supply path, call the monitoring module to record the adjusted current distribution, analyze the power supply balancing state of the tower node after the load adjustment, and generate the topology adjustment distribution value; S4: Based on the topology adjustment distribution value, the photovoltaic control module and the monitoring module are called to calculate the total harmonic distortion rate of each tower node, the inverter harmonic analysis unit is called to analyze the current harmonic components, the tower inverter with compensation capability is selected, the phase offset of the target harmonic component is calculated, and the harmonic compensation offset value is obtained; S5: Based on the harmonic compensation offset value, the inverter active filter unit is called to adjust the output voltage phase to generate a compensation waveform, the spectrum tracking analysis module is called to calculate the total harmonic distortion rate after compensation, the monitoring module is called to record the harmonic change, and the harmonic compensation optimization value is generated.

[0007] As a further solution of the present invention, the tower load fluctuation trend value includes current fluctuation rate, voltage fluctuation rate, and communication load equipment fluctuation rate; the tower node power supply margin includes standby current margin, standby voltage margin, and standby power margin; the power supply balancing adjustment amount includes target power supply node, current adjustment value, and voltage adjustment value; the topology adjustment distribution value includes adjusted current distribution, adjusted voltage distribution, and adjusted power distribution; the harmonic compensation offset value includes harmonic frequency offset, harmonic phase offset, and harmonic amplitude offset; the harmonic compensation optimization amount includes optimized harmonic frequency, optimized harmonic phase, and optimized harmonic amplitude.

[0008] As a further solution of the present invention, the step of obtaining the tower load fluctuation trend value is specifically as follows: S101: obtaining the current, voltage and total harmonic distortion rate data of the tower inverter power supply, calling the photovoltaic control module to record the tower node load data, collecting the recorded data and sorting them by time series, and generating a tower node load sequence; S102: Based on the tower node load sequence, a sliding window method is used to calculate the fluctuation amplitude of the communication load device, the maximum value, minimum value and change rate of the load change in the window are selected, and the fluctuation situation in the differentiated time window is compared to obtain the fluctuation characteristic value of the communication load device; S103: Using the fluctuation characteristic value of the communication load device and the load variation amplitude in the sliding window, the tower load fluctuation trend value is calculated using the formula: ; The average absolute difference of the load change in the window is obtained by calculation, and the fluctuation trend is calculated in combination with the fluctuation variance to obtain the tower load fluctuation trend value; in, Represents the tower load fluctuation trend value, represents the load value at the i-th time point, represents the load mean in the sliding window, represents the number of time points in the sliding window, Representative The load value at a point in time.

[0009] As a further solution of the present invention, the step of obtaining the power supply balancing adjustment amount is specifically: S201: Based on the load fluctuation trend value of the tower, the power supply margin of multiple nodes of the tower is calculated, and at the same time, the current power supply power of the multiple nodes is extracted, and the difference between the current power supply power and the maximum load demand value is calculated to obtain the initial power supply margin of the multiple nodes, and normalize them to obtain the normalized power supply margin; S202: calling the current sensor monitoring rate to obtain the current current change rate of multiple nodes, calculating the numerical deviation of the current change between adjacent nodes, and comparing the deviation with the power supply balance threshold to determine the node pairs with unbalanced power supply, and screening the adjacent tower nodes that meet the power supply imbalance condition to obtain unbalanced adjacent node pairs; S203: Based on the unbalanced adjacent node pair and in combination with the normalized power supply margin of the corresponding node, a power supply balancing adjustment amount between multiple adjacent nodes is calculated using the formula: ; Calculate and obtain the power supply adjustment demand value between multiple unbalanced adjacent nodes, and integrate the power supply capabilities of multiple adjacent nodes to obtain the power supply balance adjustment amount; in, Representative Node With Node The power supply balance adjustment between , Represents nodes and nodes The normalized supply margin, Representative Node With Node The physical distance between represents the reference physical distance between all adjacent node pairs, Representative Node The real-time current rate, represents the reference current rate of all nodes, Represents the total number of all monitored tower nodes.

[0010] As a further solution of the present invention, the step of obtaining the topology adjustment distribution value is specifically as follows: S301: Based on the power supply balancing adjustment amount, select the node with the largest power margin among the adjacent tower nodes, obtain the real-time load data of the adjacent nodes, calculate the power supply load ratio, extract the node with the highest power supply capacity and the lowest load ratio, and obtain the node with the largest power margin; S302: calling a low-loss solid-state relay to switch the power supply path, collecting power supply status data based on the node with the largest power margin, and calculating the power supply status of the node using the formula: ; Calculate and obtain the adjustment range characteristics to obtain the power supply adjustment range; in, Represents the node power supply adjustment range result, Represents the maximum power that can be supplied by the node with the largest power margin. Represents the current load power of the node with the largest power margin, Represents the node voltage measurement value Item data, represents the average value of the node voltage measurement, Represents the distance data from the node to the load center, Represents the real-time current value of the node, represents the average node current, Represents the total number of node voltage measurement data items; S303: Based on the power supply adjustment range, the power electronic switching module is called to adjust the power supply state of the tower load equipment, and the monitoring module is called to detect the adjusted current distribution, calculate the overall current distribution change, and obtain the topology adjustment distribution value.

[0011] As a further solution of the present invention, the step of obtaining the harmonic compensation offset value is specifically as follows: The step of obtaining the harmonic compensation offset value is specifically as follows: S401: Based on the topology adjustment distribution value, the voltage amplitude and phase angle of the system node are corrected, the voltage harmonic content of the multiple nodes after adjustment is calculated, the harmonic distribution characteristics of the multiple nodes are obtained, and the harmonic distribution characteristic parameters are obtained; S402: calling a photovoltaic control module to calculate the total harmonic distortion rate of the system based on the harmonic distribution characteristic parameters, and comparing the harmonic distortion rates of multiple nodes, screening nodes with distortion rates higher than a set threshold, and obtaining harmonic distortion rate screening nodes; S403: calling the monitoring module to calculate the compensation strategy for the harmonic distortion rate screening node, and determining the compensation amount according to the node harmonic distortion situation, using the formula: ; Adjust the harmonic compensation scheme of multiple nodes to obtain the harmonic compensation offset value; in, Represents the harmonic compensation offset value, Represents the The harmonic voltage value of the node, Represents the The target harmonic voltage value of the node, Representative The total harmonic distortion rate of each node, represents the compensation intensity factor, Representative The current harmonic content of each node, Represents the The compensation weight of the node, Represents the total number of harmonic distortion filter nodes.

[0012] As a further solution of the present invention, the step of obtaining the harmonic compensation optimization amount is specifically as follows: S501: Based on the harmonic compensation offset value, calling the inverter power active filter unit, adjusting the output voltage phase, and calculating the deviation value between the adjusted voltage phase error and the target phase to obtain a phase error correction value; S502: calling the spectrum tracking and analysis module, calculating the harmonic distortion rate after compensation based on the phase error correction value, and extracting the distortion coefficient corresponding to the differentiated harmonic order, using the formula: ; The harmonic distortion deviation is calculated; in, represents the harmonic distortion deviation rate, Representative The distortion coefficient of the harmonic order, Representative The reference harmonic distortion coefficient of the order, represents the total number of harmonic orders, Representative before compensation The harmonic distortion coefficient of the order, Represents the previous compensation cycle Harmonic distortion coefficient of order; S503: Based on the harmonic distortion deviation, filter out harmonic orders with significant distortion changes, calculate deviation values ​​from a reference distortion level, and generate a harmonic compensation optimization value.

[0013] A tower coordinated power supply system, the tower coordinated power supply system is used to execute the tower coordinated power supply method, the system comprises: The tower load monitoring unit obtains the tower inverter power supply current, voltage, and total harmonic distortion rate data, calls the photovoltaic control module to record the tower node load, collects the current fluctuation value of the communication load equipment, uses the sliding window method to calculate the load fluctuation trend, and selects the tower nodes whose load fluctuation amplitude exceeds the set threshold. The monitoring module is called to record the corresponding time series fluctuation curve, calculates the load fluctuation trend value of the tower node, and calculates the tower power supply margin value based on the load fluctuation trend value; The power supply balance calculation unit calls the current sensor monitoring rate based on the power supply margin value of the iron tower, obtains the power supply status of the adjacent iron tower nodes, calculates the power supply balance threshold, screens out the iron tower nodes that meet the power supply adjustment conditions, and calculates the power supply balance adjustment amount; The power supply path adjustment unit selects the node with the largest power margin among the adjacent tower nodes according to the power supply balancing adjustment amount, calls the low-loss solid-state relay to switch the power supply path, calculates the power supply adjustment range of the node, calls the power electronic switching module to adjust the tower load equipment, calls the monitoring module to detect the current distribution, and generates a topology adjustment distribution value; The harmonic compensation calculation unit adjusts the distribution value based on the topology, calls the photovoltaic control module to calculate the total harmonic distortion rate, calls the monitoring module to screen the compensation node, and calculates the harmonic compensation offset value; The harmonic optimization adjustment unit calls the inverter power active filter unit to adjust the output voltage phase based on the harmonic compensation offset value, calls the spectrum tracking analysis module to calculate the harmonic distortion after compensation, and calculates the harmonic compensation optimization amount.

[0014] Compared with the prior art, the advantages and positive effects of the present invention are: In the present invention, by acquiring current, voltage, and load data, and combining the sliding window to calculate the load fluctuation trend, dynamic prediction of power supply demand is achieved. Based on the power supply margin calculation and current monitoring, adjacent nodes are screened, power distribution is adjusted, power supply balance is optimized, and single node overload or power waste is avoided. Low-loss solid-state relays are used to switch the power supply path to improve adjustment efficiency and reduce switching losses. Combined with power adjustment, load adaptability is optimized to ensure power supply coordination. According to the topology adjustment distribution, the current distribution is optimized to reduce the fluctuations caused by the adjustment. By calculating the harmonic distortion rate, compensation optimization is performed to improve the power quality and reduce the impact of harmonic interference on the equipment. This method improves the precision of power supply regulation, enhances load adaptability, and improves power supply stability and energy utilization. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 It is a schematic diagram of the workflow of the present invention; Figure 2 A flow chart of the steps for obtaining the load fluctuation trend value of the iron tower according to the present invention; Figure 3 A flow chart of the steps for obtaining the power supply balancing adjustment amount of the present invention; Figure 4 A flowchart of the steps for obtaining the topology adjustment distribution value of the present invention; Figure 5 A flowchart of the steps for obtaining the harmonic compensation offset value of the present invention; Figure 6 This is a flow chart of the steps for obtaining the optimized amount of harmonic compensation of the present invention. DETAILED DESCRIPTION

[0016] In order to make the purpose, technical solution and advantages of the present invention more clearly understood, the present invention is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not intended to limit the present invention.

[0017] In the description of the present invention, it should be understood that the terms "length", "width", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside" and the like indicate positions or positional relationships based on the positions or positional relationships shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the present invention. In addition, in the description of the present invention, "multiple" means two or more, unless otherwise clearly and specifically defined.

[0018] Example 1: Please refer to Figure 1 The present invention provides a technical solution: a tower coordinated power supply method, comprising the following steps: S1: Obtain the current, voltage and total harmonic distortion rate data of the tower inverter output end, call the photovoltaic control module to record the current output value and load status of multiple tower nodes, use the sliding window average to calculate the current fluctuation trend of multiple communication load devices within a fixed period, call the monitoring module to analyze the load change rate, determine the current load status, and generate the tower load fluctuation trend value; S2: Based on the tower load fluctuation trend value, the power supply margin of the multi-tower node is calculated, the current sensor is called to monitor the current change rate, and the current change rate is compared with the set power supply balance threshold to analyze whether there is power supply overload or redundancy. The relay control unit is called to select adjacent tower nodes with the ability to shunt or receive power to obtain the power supply balance adjustment amount; S3: According to the power supply balance adjustment amount, select the node with the largest power margin among the adjacent tower nodes, call the low-loss solid-state relay to switch the power supply path, calculate the power supply adjustment range of the node, call the power electronic switching module to gradually increase the tower load equipment, allocate the load to the new power supply path, call the monitoring module to record the adjusted current distribution, analyze the power supply balance state of the tower node after the load adjustment, and generate the topology adjustment distribution value; S4: Based on the topology adjustment distribution value, the photovoltaic control module and the monitoring module are called to calculate the total harmonic distortion rate of each tower node, the inverter harmonic analysis unit is called to analyze the current harmonic components, the tower inverter with compensation capability is selected, the phase offset of the target harmonic component is calculated, and the harmonic compensation offset value is obtained; S5: Based on the harmonic compensation offset value, the inverter active filter unit is called to adjust the output voltage phase, generate a compensation waveform, the spectrum tracking analysis module is called to calculate the total harmonic distortion rate after compensation, the monitoring module is called to record the harmonic changes, and the harmonic compensation optimization value is generated.

[0019] The tower load fluctuation trend value includes the current fluctuation rate, voltage fluctuation rate, and communication load equipment fluctuation rate. The tower node power supply margin includes the standby current margin, standby voltage margin, and standby power margin. The power supply balancing adjustment includes the target power supply node, current adjustment value, and voltage adjustment value. The topology adjustment distribution value includes the adjusted current distribution, adjusted voltage distribution, and adjusted power distribution. The harmonic compensation offset value includes the harmonic frequency offset, harmonic phase offset, and harmonic amplitude offset. The harmonic compensation optimization amount includes the optimized harmonic frequency, optimized harmonic phase, and optimized harmonic amplitude.

[0020] See also Figure 2 ,The specific steps for obtaining the tower load fluctuation trend value are: S101: obtaining the current, voltage and total harmonic distortion rate data of the tower inverter power supply, calling the photovoltaic control module to record the tower node load data, collecting the recorded data and sorting them by time series, and generating a tower node load sequence; First, the current, voltage and total harmonic distortion rate data of the tower inverter are obtained. The current and voltage can be directly read through the power metering device of the inverter. The data acquisition module is used to record the instantaneous current and voltage values ​​respectively, and the total harmonic distortion rate (THD) is calculated, that is, the ratio of the fundamental current to the sum of all harmonic currents is calculated. The value range is generally between 0% and 100%, and the typical value is between 5% and 20%. Then, the photovoltaic control module is called to read the real-time output power of the photovoltaic power generation system, and combined with the power distribution of each load branch of the tower node, the load data of each node is recorded, such as the load power of node 1 is 5kW, the load power of node 2 is 3.5kW, and the load power of node 3 is 4.2kW, etc. These data are sorted in chronological order. The records of each time point include current, voltage, power and other parameters to form load time series data. The time interval of the data can be set to 1 second, 5 seconds or 10 seconds to meet different accuracy requirements. For example, if a 10-second time interval is used, 60 sets of data can be obtained within 10 minutes. After all the data are collected, a time series sorting algorithm is used to arrange the data in chronological order. For example, the load power of node 1 at 10:00 is 5.0kW, 5.2kW at 10:10, and 5.1kW at 10:20. According to this rule, a complete tower node load sequence is formed, which can reflect the load conditions at different times for subsequent analysis.

[0021] S102: Based on the tower node load sequence, a sliding window method is used to calculate the fluctuation amplitude of the communication load device, the maximum value, minimum value and change rate of the load change in the window are selected, and the fluctuation situation in the differentiated time window is compared to obtain the fluctuation characteristic value of the communication load device; Specifically, the sliding window size can be set to 30 minutes, and the window contains 180 sets of data (calculated at 10-second intervals). In each window, the maximum and minimum values ​​of all load values ​​are first calculated. For example, the maximum load value in the window is 5.6kW, and the minimum load value is 4.8kW. The calculated fluctuation range is , and then calculate the load change rate at each time point using Calculate the load change rate at two adjacent time points. For example, if the load changes from 5.0kW to 5.2kW at a certain moment, and the time interval is 10 seconds, then the change rate is , calculate all the change rates in the entire window in turn, calculate the average of the obtained change rates, and obtain the average load change rate. Repeat the above calculation process in different time windows, compare the fluctuation amplitude and change rate in multiple time windows, and count their distribution. If it is found that the load change amplitude in a certain window is significantly larger than that in other windows, for example, the fluctuation amplitude of a certain window reaches 1.5kW, while the fluctuation amplitude of other windows is less than 0.8kW, it is judged that the load fluctuation in this time period is large, and finally the fluctuation characteristic value of the communication load equipment is obtained, which can be used to evaluate the degree of instability of the load.

[0022] S103: Using the fluctuation characteristic value of the communication load equipment and the load variation amplitude in the sliding window, the tower load fluctuation trend value is calculated using the formula: ; The average absolute difference of the load change in the window is obtained by calculation, and the fluctuation trend is calculated in combination with the fluctuation variance to obtain the tower load fluctuation trend value; in, Represents the tower load fluctuation trend value, represents the load value at the i-th time point, represents the load mean in the sliding window, represents the number of time points in the sliding window, Representative The load value at a point in time.

[0023] During the calculation process, the average absolute difference of the load change within the window is calculated first, and the formula is as follows: ; The sliding window size is set to 30 minutes, and the window contains 180 sets of data. The load change at each time point is calculated. For example, the load at time point 1 is 5.0kW, and the load at time point 2 is 5.2kW. The change is , calculate the changes at all time points in turn and find their average. For example, if the total change at 180 time points is 36kW, then the average change is Next, calculate the variance of the load in the window. For example, if the mean load in the window is 5.1kW, and the sum of the squares of the difference between the load value and the mean at each time point is 20.25, then the variance is , and finally calculate the fluctuation trend value: ; The result shows that the load fluctuation trend value in this window is 0.067. If the baseline threshold of the load fluctuation trend value is set to 0.05, this value is higher than the threshold, indicating that the load fluctuation in this time period is more obvious and is more susceptible to external factors than other time periods.

[0024] Table 1: Load fluctuation trend values ​​in different time windows

[0025] As shown in Table 1, the fluctuation trend values ​​are different in different time windows. The fluctuation trend value of the 10:00-10:30 window is the highest, which is 0.067, indicating that the load changes greatly during this period, while the fluctuation trend value of the 11:00-11:30 window is lower, which is 0.028, indicating that the load is relatively stable during this period. The impact of the high fluctuation period can be reduced by adjusting the load scheduling strategy.

[0026] See also Figure 3 , the specific steps for obtaining the power supply balancing adjustment amount are: S201: Based on the load fluctuation trend value of the tower, the power supply margin of multiple nodes of the tower is calculated, and the current power supply power of the multiple nodes is extracted, and the difference between the current power supply power and the maximum load demand value is calculated to obtain the initial power supply margin of the multiple nodes, and normalize them to obtain the normalized power supply margin; First, select the historical load data of multiple tower nodes and use the sliding average method to calculate their load change trend. Assuming that the load values ​​of a tower node in the first five minutes are 10kW, 12kW, 11kW, 13kW and 14kW respectively, the five-minute sliding average load trend value is calculated as follows: ; When calculating the power supply margin of multiple nodes of the tower, call the current power supply power of each node and calculate the difference between the maximum load demand values. Assuming that the current power supply power of a node is 20kW and the maximum load demand is 15kW, the power supply margin is calculated as follows: ; To ensure the comparability of data, the power supply margins of multiple nodes are normalized. Assuming that the maximum and minimum power supply margins of all nodes are 10 kW and 2 kW respectively, the normalized power supply margin of a node is calculated as follows: ; This process is performed among all tower nodes to obtain a complete normalized power margin array, as shown in Table 2.

[0027] Table 2 Normalized power margin calculation results Node Number Current power supply (kW) Maximum load requirement (kW) Power supply margin (kW) Normalized supply margin 1 20 15 5 0.375 2 18 12 6 0.5 3 25 18 7 0.625 4 22 14 8 0.75 As shown in Table 2, the normalized power margin of each node has been calculated and can be used for power balance adjustment in subsequent steps. The result shows that the power supply capacity of each node is significantly different. Some nodes have a higher power margin, while some nodes are close to their load limit. The calculation result of the normalized power margin provides a key basis for the subsequent power balance adjustment. This value can be used to identify nodes with excess power supply and insufficient power supply, and is used for subsequent calculation of the adjustment amount.

[0028] S202: calling the current sensor monitoring rate to obtain the current current change rate of multiple nodes, calculating the numerical deviation of the current change between adjacent nodes, and comparing the deviation with the power supply balance threshold to determine the node pairs with unbalanced power supply, and screening the adjacent tower nodes that meet the power supply imbalance condition to obtain unbalanced adjacent node pairs; Assuming that the current measurement values ​​of a node are recorded as 10A, 12A, 13A, and 15A at different time points, calculate the current current change rate: ; (in Next, calculate the numerical deviation of the current change between adjacent nodes. Assuming that the current change rates of nodes A and B are 0.5A / s and 0.3A / s respectively, the deviation is calculated as follows: ; Then compare the deviation with the power supply balancing threshold. Assuming the balancing threshold is set to 0.15A / s, then: , it is determined that the adjacent node pair has unbalanced power supply; if , the power supply is considered to be relatively balanced.

[0029] All adjacent tower nodes are traversed in turn, node pairs that meet the power supply imbalance condition are screened, and unbalanced adjacent node combinations are recorded. The results show that adjacent node pairs with unbalanced power supply can be identified by the difference in current change rate. Node pairs with values ​​greater than the threshold may need to transfer power supply loads, while node pairs with smaller values ​​do not need to be adjusted. The screened unbalanced node pairs will be used as input parameters when calculating the adjustment amount in the next step.

[0030] S203: Based on the unbalanced adjacent node pairs and in combination with the normalized power supply margin of the corresponding nodes, the power supply balancing adjustment amount between the multiple adjacent nodes is calculated using the formula: ; Calculate and obtain the power supply adjustment demand value between multiple unbalanced adjacent nodes, and integrate the power supply capabilities of multiple adjacent nodes to obtain the power supply balance adjustment amount; in, Representative Node With Node The power supply balance adjustment between , Represents nodes and nodes The normalized supply margin, Representative Node With Node The physical distance between represents the reference physical distance between all adjacent node pairs, Representative Node The real-time current rate, represents the reference current rate of all nodes, Represents the total number of all monitored tower nodes.

[0031] formula: ; Assume that a pair of nodes and The normalized power supply margins are and , whose physical distance is , the reference physical distance is set to 1000m, and the current rates of adjacent nodes are , the reference current rate is set to , the adjustment amount is calculated as follows: ; Calculated , is the power supply balance adjustment value of the adjacent node pair. This value indicates that the node Need to node 0.284kW of power is transmitted to balance the power supply load of the two nodes. This result directly affects the power supply scheduling strategy. After the adjustment amount of all unbalanced adjacent node pairs is calculated, it is necessary to comprehensively consider the power supply capacity and perform corresponding power supply adjustment operations to ultimately achieve balanced distribution of the entire tower power supply system.

[0032] See also Figure 4 , the specific steps for obtaining the topology adjustment distribution value are: S301: Based on the power supply balancing adjustment amount, select the node with the largest power margin among the adjacent tower nodes, obtain the real-time load data of the adjacent nodes, calculate the power supply load ratio, extract the node with the highest power supply capacity and the lowest load ratio, and obtain the node with the largest power margin; First, it is necessary to obtain the power margin data of adjacent tower nodes. For this purpose, it is necessary to establish a power monitoring matrix for each tower node. The matrix consists of parameters such as the current load power, voltage, current, and distance to the load center of each node. For example, nodes A, B, and C have maximum power supply powers of 100kW, 80kW, and 120kW, respectively, and the current load powers are 60kW, 50kW, and 90kW, respectively. The power margin can be calculated as the maximum power supply power minus the current load power, and the power margins of A, B, and C are 40kW, 30kW, and 30kW, respectively. The node with the largest power margin, that is, node A, is selected, and then the real-time load data of the adjacent nodes is obtained. This can be obtained through smart meters or remote sensors. For example, the real-time load powers of the adjacent nodes B, C, and D are 50kW, 90kW, and 40kW. The power supply load proportion is calculated using the load proportion calculation formula: ; The proportions are 62.5%, 75% and 66.7% respectively. Among them, node B has the lowest proportion and its power supply capacity is higher than that of nodes C and D. Finally, node B is selected as the node with the largest power margin and the lowest load proportion. The result shows that node B can provide more stable power supply support and will not affect the overall topology adjustment due to excessive load.

[0033] S302: calling a low-loss solid-state relay to switch the power supply path, collecting power supply status data based on the node with the largest power margin, and calculating the power supply status of the node using the formula: ; Calculate and obtain the adjustment range characteristics to obtain the power supply adjustment range; in, Represents the node power supply adjustment range result, Represents the maximum power that can be supplied by the node with the largest power margin. Represents the current load power of the node with the largest power margin, Represents the node voltage measurement value Item data, represents the average value of the node voltage measurement, Represents the distance data from the node to the load center, Represents the real-time current value of the node, represents the average node current, Represents the total number of node voltage measurement data items; For example, when the A node is powered, the voltage is 220V, the current is 180A, and the power is 39.6kW. After switching to the B node, the voltage is 218V, the current is 200A, and the power is 43.6kW. Then the power supply status is calculated using the formula: ; in, ,but , assuming that the voltage data measured at node B is , calculate the average voltage ,but , the distance from the node to the load center , current value , assuming the average current ,but , substitute into the calculation: ; The result shows that the power supply adjustment range of node B is small, which means that the power supply capacity of node B can be optimized within a smaller range after the topology adjustment, and will not cause large fluctuations in the entire system, indicating that this node is suitable as a preferred node for power topology adjustment.

[0034] S303: Based on the power supply adjustment range, the power electronic switching module is called to adjust the power supply state of the tower load equipment, and the monitoring module is called to detect the adjusted current distribution, calculate the overall current distribution change, and obtain the topology adjustment distribution value.

[0035] Adjustment range based on power supply , call the power electronic switching module to adjust the power supply status of the tower load equipment, and monitor the current distribution after adjustment. For example, after adjustment, the current of node A drops to 160A, and the current of node B rises to 220A. The total power demand is 200kW, while the distribution before adjustment is 180A at node A and 200A at node B. The change in the overall current distribution after adjustment is calculated as: ; in, , indicating that the current balance is improved after adjustment, and the topology adjustment distribution value is obtained, indicating that the new power supply topology can better balance the load.

[0036] Table 3 Current distribution before and after power supply adjustment node Current before adjustment (A) Adjusted current (A) Change(A) A 180 160 20 B 200 220 20 Total change - - 40 As shown in Table 3, the overall current distribution changes by 40 A after adjustment. This result shows that after the power supply topology is adjusted, the loads between nodes are more balanced, reducing the instability caused by overload operation of a single node and optimizing the operation status of the entire power network.

[0037] See also Figure 5 , the specific steps for obtaining the harmonic compensation offset value are: S401: Based on the topology adjustment distribution value, the voltage amplitude and phase angle of the system node are corrected, the voltage harmonic content of the multiple nodes after adjustment is calculated, the harmonic distribution characteristics of the multiple nodes are obtained, and the harmonic distribution characteristic parameters are obtained; First, the network topology of the multi-node power system is determined. On this basis, the impedance parameters, connection relationship and power flow direction between nodes are used to calculate the voltage amplitude and phase angle of each node. After setting the initial voltage state, the possible harmonic interference is simulated by superimposing harmonic current sources, and the voltage harmonic content of multiple nodes is calculated in combination with the measured data. Among them, the voltage amplitude can be directly obtained by measuring the effective value of the node voltage, and the phase angle can be obtained based on the power flow calculation combined with the measurement of the synchronous phase angle. After setting the reference node, the fast Fourier transform (FFT) is used to perform spectral analysis on the voltage waveform of each node to obtain the amplitude and phase data of each harmonic component. The harmonic voltage value of each node is normalized so that it is within a relatively comparable numerical range. The harmonic distribution characteristics of different nodes are calculated, the mean and variance parameters of the harmonic voltage are defined, and the distribution characteristics of harmonics in the entire power grid are evaluated by statistical methods. The degree of local harmonic influence is evaluated by the voltage harmonic differences between adjacent nodes. For example, for a certain node, its harmonic voltage It can be expressed as: ; in, is the harmonic number considered, Represents the Node at harmonic order After sorting out the harmonic voltage data of all nodes, the overall harmonic distribution characteristic parameters, such as the mean, variance and contribution ratio of each harmonic, are calculated based on statistical characteristics to facilitate subsequent compensation analysis, as shown in Table 4: Table 4 Harmonic distribution characteristic parameters

[0038] As shown in Table 4, the harmonic voltage mean and its variance of each node reflect the degree and distribution characteristics of harmonic influence, which can be used for subsequent screening of compensation strategies. This result shows that the harmonic distribution characteristics of each node have been calculated, which can be used for the subsequent calculation of harmonic distortion rate and provide a basis for compensation strategies.

[0039] S402: calling the photovoltaic control module, calculating the total harmonic distortion rate of the system based on the harmonic distribution characteristic parameters, and comparing the harmonic distortion rates of multiple nodes at the same time, screening the nodes with distortion rates higher than the set threshold, and obtaining the harmonic distortion rate screening nodes; First, the total harmonic distortion (THD) of the system is calculated based on the harmonic distribution characteristic parameters. THD can be calculated by the ratio of each harmonic voltage to the fundamental voltage. The calculation formula is: ; in, is the fundamental voltage, For each harmonic voltage, by measuring the voltage waveform of each node and performing FFT analysis, the THD value of all nodes can be obtained. On this basis, the harmonic distortion rate of all nodes is sorted and the threshold is set. To filter out high distortion nodes, for example, when setting the threshold If the THD of a node exceeds 5%, the node will be selected into the harmonic distortion rate screening node list, such as: ; Then nodes 1 and 3 are screened out and enter the subsequent compensation strategy calculation step. This result shows that the nodes with high harmonic distortion rate have been screened out, and compensation calculation needs to be performed on these nodes in the future to reduce their harmonic distortion impact.

[0040] S403: Call the monitoring module to calculate the compensation strategy for the harmonic distortion rate screening node, and determine the compensation amount according to the node harmonic distortion situation, using the formula: ; Adjust the harmonic compensation scheme of multiple nodes to obtain the harmonic compensation offset value; in, Represents the harmonic compensation offset value, Represents the The harmonic voltage value of the node, Represents the The target harmonic voltage value of the node, Representative The total harmonic distortion rate of each node, represents the compensation intensity factor, Representative The current harmonic content of each node, Represents the The compensation weight of the node, Represents the total number of harmonic distortion filter nodes.

[0041] First, obtain the harmonic voltage value of the filtered node And target harmonic voltage value , calculate the difference between the two, and then combine the total harmonic distortion rate and current harmonic content , determine the compensation amount , the specific calculation is as follows: ; Among them, the compensation intensity factor Set to 0.8, compensation weight According to the node harmonic influence degree setting, assuming that at node 1: ; Bring it into calculation: ; Assumptions ,but: ; At this time, the harmonic compensation offset value of node 1 is calculated to be 0.226. Similarly, the compensation offset values ​​are calculated for all the screened nodes, and finally the harmonic compensation scheme of multiple nodes is adjusted to obtain a complete list of harmonic compensation offset values ​​for subsequent actual compensation operations.

[0042] The calculation results show that the offset value required for harmonic compensation of node 1 is 0.226. The compensation strategy can adjust the output of the corresponding compensation device according to this value to reduce the degree of harmonic distortion of the node and finally obtain the harmonic offset value adjusted after compensation.

[0043] See also Figure 6 , the specific steps for obtaining the harmonic compensation optimization amount are: S501: Based on the harmonic compensation offset value, calling the inverter power active filter unit, adjusting the output voltage phase, and calculating the deviation value between the adjusted voltage phase error and the target phase to obtain a phase error correction value; First, the working parameters of the inverter active filter unit need to be adjusted, including the phase control of the output voltage. The actual phase of the current output voltage is read by the control unit, compared with the set target phase, and the phase offset value is calculated. If the offset value exceeds the allowable range, it is adjusted in the offset direction, that is, if the current phase lags behind the target phase, the output voltage phase is increased; if the current phase is ahead of the target phase, the output voltage phase is reduced to ensure that the adjusted voltage phase is as close to the target phase as possible. This adjustment process can adopt a step-by-step approximation method, that is, by continuously adjusting the output voltage phase and measuring the corrected phase deviation value, the final phase deviation is within the set threshold range. For example, For example, if the target phase is 60 degrees and the current measured phase is 62 degrees, the phase needs to be adjusted to decrease by 2 degrees. If the current measured phase is 57 degrees, it needs to be increased by 3 degrees. During this process, an adjustment step can be set, for example, adjusting 0.5 degrees each time until the target range is reached. After the adjustment is completed, the system measures the current phase again and compares it with the target phase to obtain the adjusted voltage phase error value, that is, the deviation between the corrected phase and the target phase. The deviation value is used for subsequent compensation calculations. The result shows that the current phase error has been adjusted. If the value is still outside the threshold, the voltage phase needs to be further adjusted. If it is within the threshold range, the next step of harmonic distortion analysis is entered.

[0044] S502: Call the spectrum tracking analysis module to calculate the harmonic distortion rate after compensation based on the phase error correction value, and extract the distortion coefficient corresponding to the differentiated harmonic order using the formula: ; The harmonic distortion deviation is calculated; in, represents the harmonic distortion deviation rate, Representative The distortion coefficient of the order harmonics, Representative The reference harmonic distortion coefficient of the order, represents the total number of harmonic orders, Representative before compensation The harmonic distortion coefficient of the order, Represents the previous compensation cycle Harmonic distortion coefficient of order; First, the current harmonic distortion rate needs to be measured and compared with the reference harmonic distortion rate. During this process, the system will extract the harmonic distortion coefficients one by one, obtain the significantly differentiated harmonic orders, and use the formula to calculate the harmonic distortion deviation. In this formula, Represents the harmonic distortion deviation rate. During the calculation process, the distortion coefficients of each order of harmonics need to be extracted in turn. , reference harmonic distortion coefficient , and the harmonic distortion coefficient before compensation and in the previous compensation cycle and And calculate, assuming that the measured data of a certain harmonic order is as shown in Table 5: Table 5 Measurement data of harmonic orders

[0045] Calculate according to the data shown in Table 5: ; The calculation results show that the deviation value of the current harmonic distortion rate is 0.3333. The numerical results show that the current harmonic distortion rate has a large deviation compared with the reference value, which means that the harmonic compensation effect still needs to be optimized. In the future, it is necessary to further adjust the harmonic compensation optimization amount to reduce the deviation value, thereby improving the harmonic compensation effect.

[0046] S503: Based on the harmonic distortion deviation, filter out harmonic orders with significant distortion changes, calculate deviation values ​​from a reference distortion level, and generate a harmonic compensation optimization value.

[0047] It is necessary to screen the harmonic orders with significant distortion changes. The screening criteria can be set as the distortion coefficient change exceeding a certain set threshold. For example, if the threshold for significant distortion change is set to 0.03, the harmonic orders with a change value greater than 0.03 will be screened out, such as order 3 in the above table (distortion change value is 0.05). After screening, the deviation value of the order from the reference distortion level is calculated. The specific calculation method is: ; For the selected harmonic orders, the compensation optimization amount can be calculated according to the adjustment ratio. For example, if the adjustment ratio is set to 50%, the compensation optimization amount is calculated as: ; The results show that the harmonic distortion deviation of order 3 is still large, and it needs to be further adjusted by using an optimized compensation amount of 0.025. The final generated set of harmonic compensation optimization amounts is: , which is used for subsequent compensation adjustment. The numerical results show that the harmonic distortion compensation of this order still needs to be optimized. The next step is to introduce the optimized compensation amount into the control strategy to further reduce the harmonic distortion of this order and improve the overall harmonic compensation effect of the system.

[0048] A tower coordinated power supply system, the tower coordinated power supply system is used to execute the above-mentioned tower coordinated power supply method, the system comprises: The tower load monitoring unit obtains the tower inverter power supply current, voltage, and total harmonic distortion rate data, calls the photovoltaic control module to record the tower node load, collects the current fluctuation value of the communication load equipment, uses the sliding window method to calculate the load fluctuation trend, and selects the tower nodes whose load fluctuation amplitude exceeds the set threshold. The monitoring module is called to record the corresponding time series fluctuation curve, calculates the load fluctuation trend value of the tower node, and calculates the tower power supply margin value based on the load fluctuation trend value; The power supply balance calculation unit calls the current sensor monitoring rate based on the power supply margin value of the tower, obtains the power supply status of the adjacent tower nodes, calculates the power supply balance threshold, selects the tower nodes that meet the power supply adjustment conditions, and calculates the power supply balance adjustment amount; The power supply path adjustment unit selects the node with the largest power margin among the adjacent tower nodes according to the power supply balancing adjustment amount, calls the low-loss solid-state relay to switch the power supply path, calculates the power supply adjustment range of the node, calls the power electronic switching module to adjust the tower load equipment, calls the monitoring module to detect the current distribution, and generates the topology adjustment distribution value; The harmonic compensation calculation unit adjusts the distribution value based on the topology, calls the photovoltaic control module to calculate the total harmonic distortion rate, calls the monitoring module to screen the compensation nodes, and calculates the harmonic compensation offset value; The harmonic optimization adjustment unit calls the inverter power active filter unit to adjust the output voltage phase based on the harmonic compensation offset value, calls the spectrum tracking analysis module to calculate the harmonic distortion after compensation, and calculates the harmonic compensation optimization amount.

[0049] The above are only preferred embodiments of the present invention and are not intended to limit the present invention in other forms. Any technician familiar with the profession may use the technical contents disclosed above to change or modify them into equivalent embodiments with equivalent changes and apply them to other fields. However, any simple modification, equivalent change and modification made to the above embodiments based on the technical essence of the present invention without departing from the technical solution of the present invention still falls within the protection scope of the technical solution of the present invention.

Claims

1. A tower collaborative power supply method, characterized in that: The following steps are involved: S1: Obtain the current, voltage, and total harmonic distortion rate data of the tower inverter power supply, call the photovoltaic control module to record the tower node load, use the sliding window to calculate the communication load device fluctuation, and generate the tower load fluctuation trend value; S2: Based on the tower load fluctuation trend value, calculate the power supply margin of the tower node, call the current sensor to monitor the rate, compare the power supply balance threshold, screen the adjacent tower nodes, and generate the power supply balance adjustment amount; S3: According to the power balance adjustment amount, select the node with the largest power margin among the adjacent tower nodes, call the low-loss solid-state relay to switch the power supply path, calculate the power supply adjustment range of the node, call the power electronic switching module to adjust the tower load equipment, call the monitoring module to detect the current distribution, and generate the topology adjustment distribution value; S4: Based on the topology adjustment distribution value, calling the photovoltaic control module to calculate the total harmonic distortion rate, calling the monitoring module, screening the compensation node, and generating the harmonic compensation offset value; S5: Based on the harmonic compensation offset value, the inverter power active filter unit is called to adjust the output voltage phase, and the spectrum tracking analysis module is called to calculate the harmonic distortion after compensation to generate the harmonic compensation optimization amount.

2. The tower coordinated power supply method according to claim 1, characterized in that: The tower load fluctuation trend value includes the current fluctuation rate, the voltage fluctuation rate, and the communication load equipment fluctuation rate. The tower node power supply margin includes the standby current margin, the standby voltage margin, and the standby power margin. The power supply balancing adjustment amount includes the target power supply node, the current adjustment value, and the voltage adjustment value. The topology adjustment distribution value includes the adjusted current distribution, the adjusted voltage distribution, and the adjusted power distribution. The harmonic compensation offset value includes the harmonic frequency offset, the harmonic phase offset, and the harmonic amplitude offset. The harmonic compensation optimization amount includes the optimized harmonic frequency, the optimized harmonic phase, and the optimized harmonic amplitude.

3. The tower coordinated power supply method according to claim 2, characterized in that: The steps for obtaining the tower load fluctuation trend value are specifically as follows: S101: obtaining the current, voltage and total harmonic distortion rate data of the tower inverter power supply, calling the photovoltaic control module to record the tower node load data, collecting the recorded data and sorting them by time series, and generating a tower node load sequence; S102: Based on the tower node load sequence, a sliding window method is used to calculate the fluctuation amplitude of the communication load device, the maximum value, minimum value and change rate of the load change in the window are selected, and the fluctuation situation in the differentiated time window is compared to obtain the fluctuation characteristic value of the communication load device; S103: Using the fluctuation characteristic value of the communication load device and the load variation amplitude in the sliding window, the tower load fluctuation trend value is calculated using the formula: ； The average absolute difference of the load change in the window is obtained by calculation, and the fluctuation trend is calculated in combination with the fluctuation variance to obtain the tower load fluctuation trend value; in, Represents the tower load fluctuation trend value, represents the load value at the i-th time point, represents the load mean in the sliding window, represents the number of time points in the sliding window, Representative The load value at a point in time.

4. The tower coordinated power supply method according to claim 3, characterized in that: The steps for obtaining the power supply balancing adjustment amount are specifically as follows: S201: Based on the load fluctuation trend value of the tower, the power supply margin of multiple nodes of the tower is calculated, and at the same time, the current power supply power of the multiple nodes is extracted, and the difference between the current power supply power and the maximum load demand value is calculated to obtain the initial power supply margin of the multiple nodes, and normalize them to obtain the normalized power supply margin; S202: calling the current sensor monitoring rate to obtain the current current change rate of multiple nodes, calculating the numerical deviation of the current change between adjacent nodes, and comparing the deviation with the power supply balance threshold to determine the node pairs with unbalanced power supply, and screening the adjacent tower nodes that meet the power supply imbalance condition to obtain unbalanced adjacent node pairs; S203: Based on the unbalanced adjacent node pair and in combination with the normalized power supply margin of the corresponding node, a power supply balancing adjustment amount between multiple adjacent nodes is calculated using the formula: ； Calculate and obtain the power supply adjustment demand value between multiple unbalanced adjacent nodes, and integrate the power supply capabilities of multiple adjacent nodes to obtain the power supply balance adjustment amount; in, Representative Node With Node The power supply balance adjustment between , Represents nodes and nodes The normalized supply margin, Representative Node With Node The physical distance between represents the reference physical distance between all adjacent node pairs, Representative Node The real-time current rate, represents the reference current rate of all nodes, Represents the total number of all monitored tower nodes.

5. The tower coordinated power supply method according to claim 4, characterized in that: The steps for obtaining the topology adjustment distribution value are specifically as follows: S301: Based on the power supply balancing adjustment amount, select the node with the largest power margin among the adjacent tower nodes, obtain the real-time load data of the adjacent nodes, calculate the power supply load ratio, extract the node with the highest power supply capacity and the lowest load ratio, and obtain the node with the largest power margin; S302: calling a low-loss solid-state relay to switch the power supply path, collecting power supply status data based on the node with the largest power margin, and calculating the power supply status of the node using the formula: ； Calculate and obtain the adjustment range characteristics to obtain the power supply adjustment range; in, Represents the node power supply adjustment range result, Represents the maximum power that can be supplied by the node with the largest power margin. Represents the current load power of the node with the largest power margin, Represents the node voltage measurement value Item data, represents the average value of the node voltage measurement, Represents the distance data from the node to the load center, Represents the real-time current value of the node, represents the average node current, Represents the total number of node voltage measurement data items; S303: Based on the power supply adjustment range, the power electronic switching module is called to adjust the power supply state of the tower load equipment, and the monitoring module is called to detect the adjusted current distribution, calculate the overall current distribution change, and obtain the topology adjustment distribution value.

6. The tower coordinated power supply method according to claim 5, characterized in that: The steps for obtaining the harmonic compensation offset value are specifically as follows: S401: Based on the topology adjustment distribution value, the voltage amplitude and phase angle of the system node are corrected, the voltage harmonic content of the multiple nodes after adjustment is calculated, the harmonic distribution characteristics of the multiple nodes are obtained, and the harmonic distribution characteristic parameters are obtained; S402: calling a photovoltaic control module to calculate the total harmonic distortion rate of the system based on the harmonic distribution characteristic parameters, and comparing the harmonic distortion rates of multiple nodes, screening nodes with distortion rates higher than a set threshold, and obtaining harmonic distortion rate screening nodes; S403: calling the monitoring module to calculate the compensation strategy for the harmonic distortion rate screening node, and determining the compensation amount according to the node harmonic distortion situation, using the formula: ； Adjust the harmonic compensation scheme of multiple nodes to obtain the harmonic compensation offset value; in, Represents the harmonic compensation offset value, Represents the Harmonic voltage value of the node, Represents the The target harmonic voltage value of the node, Representative The total harmonic distortion rate of each node, represents the compensation intensity factor, Representative The current harmonic content of each node, Represents the The compensation weight of the node, Represents the total number of harmonic distortion rate screening nodes.

7. The tower coordinated power supply method according to claim 6, characterized in that: The steps for obtaining the harmonic compensation optimization amount are specifically as follows: S501: Based on the harmonic compensation offset value, calling the inverter power active filter unit, adjusting the output voltage phase, and calculating the deviation value between the adjusted voltage phase error and the target phase to obtain a phase error correction value; S502: calling the spectrum tracking and analysis module, calculating the harmonic distortion rate after compensation based on the phase error correction value, and extracting the distortion coefficient corresponding to the differentiated harmonic order, using the formula: ； The harmonic distortion deviation is calculated; in, represents the harmonic distortion deviation rate, Representative The distortion coefficient of the harmonic order, Representative The reference harmonic distortion coefficient of the order, represents the total number of harmonic orders, Representative before compensation The harmonic distortion coefficient of the order, Represents the previous compensation cycle Harmonic distortion coefficient of order; S503: Based on the harmonic distortion deviation, filter out harmonic orders with significant distortion changes, calculate deviation values ​​from a reference distortion level, and generate a harmonic compensation optimization value.

8. A tower coordinated power supply system, characterized in that: According to the tower coordinated power supply method according to any one of claims 1 to 7, the system comprises: The tower load monitoring unit obtains the tower inverter power supply current, voltage, and total harmonic distortion rate data, calls the photovoltaic control module to record the tower node load, collects the current fluctuation value of the communication load equipment, uses the sliding window method to calculate the load fluctuation trend, and screens out the tower nodes whose load fluctuation amplitude exceeds the set threshold. The monitoring module is called to record the corresponding time series fluctuation curve, calculates the load fluctuation trend value of the tower node, and calculates the tower power supply margin value based on the load fluctuation trend value; The power supply balance calculation unit calls the current sensor monitoring rate based on the power supply margin value of the iron tower, obtains the power supply status of the adjacent iron tower nodes, calculates the power supply balance threshold, screens out the iron tower nodes that meet the power supply adjustment conditions, and calculates the power supply balance adjustment amount; The power supply path adjustment unit selects the node with the largest power margin among the adjacent tower nodes according to the power supply balancing adjustment amount, calls the low-loss solid-state relay to switch the power supply path, calculates the power supply adjustment range of the node, calls the power electronic switching module to adjust the tower load equipment, calls the monitoring module to detect the current distribution, and generates a topology adjustment distribution value; The harmonic compensation calculation unit adjusts the distribution value based on the topology, calls the photovoltaic control module to calculate the total harmonic distortion rate, calls the monitoring module to screen the compensation node, and calculates the harmonic compensation offset value; The harmonic optimization adjustment unit calls the inverter power active filter unit to adjust the output voltage phase based on the harmonic compensation offset value, calls the spectrum tracking analysis module to calculate the harmonic distortion after compensation, and calculates the harmonic compensation optimization amount.

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