A city distribution network automation system

Abstract

The present invention provides an urban distribution network automation system, which improves the quality of power distribution by automatically adjusting the power factor of each node in the distribution network. The system consists of four main modules: a distribution network data acquisition module, a data communication module, a reactive power compensation module and a central control module. The data acquisition module collects the power data of each node, the communication module ensures the data transmission between the parts, the central control module processes the data and issues control instructions, and the reactive power compensation module performs the actual power compensation. The reactive power compensation module is subdivided into three levels: the first-level node is used for high-voltage power distribution, the second-level node is used for medium-voltage power distribution, and the third-level node is used for low-voltage power distribution. The system can perform reactive power compensation for nodes of different voltage levels, can comprehensively improve the overall quality of the distribution network, and effectively reduce line losses. The system can optimize the operation of the distribution network and improve efficiency by real-time monitoring, analysis and adjustment of each node of the distribution network.

Description

Technical Field

[0001] The present application relates to the field of electric power, and in particular to an urban distribution network automation system. Background Art

[0002] The urban distribution network is a network used to distribute high-voltage electric energy to users in the power system. It is mainly composed of substations, distribution lines and distribution transformers. Its main function is to transmit electric energy from power plants to cities through the high-voltage transmission network, and then pass through step-down substations to reduce the voltage to a voltage level suitable for users, and finally send it to residential, commercial and industrial users through distribution lines. The distribution network is the link closest to users in the power system, which is directly related to the reliable supply of electric energy and the user's power experience.

[0003] However, the existing urban distribution network has some shortcomings. First, the fault location efficiency of the traditional distribution network is low, which can easily lead to large-scale power outages. Second, the operation mode of the distribution network is relatively fixed, which makes it difficult to adapt to load changes and the needs of distributed energy access. In addition, the distribution network equipment is aging, the operation and maintenance costs are high, and the reliability and safety are facing challenges. Summary of the invention

[0004] The present application provides an urban distribution network automation system, comprising:

[0005] The distribution network data collection module is used to collect node power data of each distribution node in the distribution network;

[0006] Data communication module, used for data communication between modules;

[0007] Reactive power compensation module, used to controllably perform reactive power compensation on each distribution node;

[0008] A central control module, used for processing data and issuing control instructions to the reactive power compensation module;

[0009] Wherein, the distribution network data acquisition module is communicatively connected to the data communication module, the reactive power compensation module is communicatively connected to the data communication module, and the central control module is communicatively connected to the data communication module;

[0010] Among them, the reactive compensation module includes a primary node reactive compensation module, a secondary node reactive compensation module and a tertiary node reactive compensation module, and the primary node reactive compensation module, the secondary node reactive compensation module and the tertiary node reactive compensation module are distributed and controlled and connected to the central control module.

[0011] By adopting the above technical solution, the urban distribution network automation system can integrate functional modules such as data acquisition, communication, reactive power compensation and central control to perform reactive power compensation on distribution nodes at various voltage levels of the distribution network, thereby improving the overall distribution quality of the distribution network and reducing line losses.

[0012] Optionally, the urban distribution network automation system further includes a power factor adjustment strategy, and the power factor adjustment strategy includes the following steps:

[0013] A1, collecting corresponding node power data at each distribution node of a preset distribution network through the distribution network data collection module within a preset sampling time;

[0014] A2, transmitting node power data to the central control module through the data communication module;

[0015] A3, the central control module determines each primary distribution node, secondary distribution node and tertiary distribution node according to the preset distribution network topology data;

[0016] A4, obtaining the apparent power data and power factor data of each third-level distribution node based on the node power data, and calculating the corresponding apparent power average value and power factor average value;

[0017] A5, if the average apparent power of the three-level distribution node is not less than the preset three-level apparent power threshold, and the average power factor of the three-level distribution node is less than the corresponding node target power factor, then in the reactive power compensation period corresponding to the three-level distribution node, the three-level node reactive power compensation module connected to the three-level distribution node is used to perform reactive power compensation on the three-level distribution node to adjust the average power factor of the three-level distribution node to the corresponding node target power factor;

[0018] A6, obtaining the power factor data of each secondary distribution node based on the node power data, and calculating the corresponding power factor average value;

[0019] A7: If the average power factor of the secondary distribution node is less than the corresponding node target power factor, the secondary distribution node is subjected to reactive power compensation by the secondary node reactive power compensation module connected to the secondary distribution node to adjust the average power factor of the secondary distribution node to the corresponding node target power factor;

[0020] A8, obtaining the power factor data of each primary distribution node based on the node power data, and calculating the corresponding power factor average value;

[0021] A9. If the average power factor of the primary distribution node is less than the corresponding node target power factor, reactive power compensation is performed on the primary distribution node through the primary node reactive power compensation module connected to the primary distribution node to adjust the average power factor of the primary distribution node to the corresponding node target power factor.

[0022] By adopting the above technical scheme, the urban distribution network automation system can adjust the power factor of each distribution node by adopting a hierarchical, low-to-high reactive power compensation method, taking into account the load conditions of the three-level nodes, and only performing compensation when the load reaches a certain level to avoid reactive reverse transmission. This can improve the power factor of the distribution network, reduce reactive power loss, optimize power transmission efficiency, and also adapt to dynamic changes in the distribution network load.

[0023] Optionally, the power factor adjustment strategy further includes the following steps for determining the reactive power compensation period of each third-level power distribution node:

[0024] B1, obtaining historical power data of each third-level distribution node from a preset power database according to a preset retrospective analysis window;

[0025] B2, obtaining corresponding historical reactive power data according to the historical power data corresponding to each third-level distribution node;

[0026] B3, determine the reactive power valley period corresponding to each third-level distribution node based on historical reactive power data analysis;

[0027] B4, determining the reactive power active period corresponding to each third-level distribution node according to the reactive power off-peak period;

[0028] B5, define the reactive power active period of each third-level distribution node as the reactive power compensation period.

[0029] By adopting the above technical solution, the urban distribution network automation system can determine the available reactive power compensation period through historical data and perform reactive power compensation when necessary, thus avoiding unnecessary compensation operations and reducing the risk of reactive power reverse transmission.

[0030] Optionally, the urban distribution network automation system further includes a distribution load regulation strategy, and the distribution load regulation strategy includes the following steps:

[0031] C1, obtain the rated load value of each distribution node from the power database;

[0032] C2, obtaining corresponding apparent power data from the node power data of each distribution node;

[0033] C3, calculating the corresponding apparent power mean value according to the corresponding apparent power data;

[0034] C4, calculates the corresponding node load rate based on the apparent power average and rated load value;

[0035] C5, determining the lower-level distribution nodes connected to each distribution node according to the distribution network topology data;

[0036] C6, respectively obtain the node target power factor of each lower-level distribution node corresponding to each distribution node and define it as the current target power factor;

[0037] C7, if the node load rate of the distribution node is greater than the preset overload threshold, the corresponding target power factor update value is calculated based on the sum of the preset power factor adjustment value and the current target power factor of each lower-level distribution node;

[0038] C8, updating the node target power factor according to the target power factor update value corresponding to each lower-level power distribution node.

[0039] By adopting the above technical solution, the urban distribution network automation system can realize adaptive optimization of distribution load by dynamically monitoring and adjusting the load rate and power factor of distribution nodes, reduce load pressure by identifying heavy load conditions and adjusting the target power factor of lower-level nodes, prevent overload problems, and improve the operating efficiency and stability of the entire distribution network.

[0040] Optionally, the urban distribution network automation system further includes a distribution node abnormality analysis strategy, and the distribution node abnormality analysis strategy includes the following steps:

[0041] D1, obtaining corresponding active power data from the node power data of each distribution node;

[0042] D2, calculate the corresponding average active power according to the average active power data of each distribution node and define it as the average active power of this level;

[0043] D3, calculating the corresponding average active power according to the active power data of each lower-level distribution node corresponding to the distribution node and defining it as the lower-level average active power;

[0044] D4, calculating the lower-level total active power by summing the lower-level average active powers of all lower-level distribution nodes corresponding to the distribution node;

[0045] D5, calculate the corresponding node active power loss ratio according to the average active power of this level and the total active power of the lower level;

[0046] D6: If the node active power loss ratio of the distribution node is greater than a preset active power loss ratio threshold, the distribution node is defined as an abnormal active power loss node.

[0047] By adopting the above technical solution, the urban distribution network automation system can calculate and monitor the active power loss ratio of each distribution node by comparing the active power data of each distribution node with its subordinate distribution nodes, thereby effectively identifying abnormal nodes related to active power loss, and can quickly locate problem nodes in the distribution network, which helps to promptly discover nodes or lines with excessive power loss, improve maintenance efficiency and accuracy, prevent potential equipment failures, extend equipment life, and improve the reliability and economy of the entire distribution network.

[0048] Optionally, the power distribution node abnormality analysis strategy further includes the following steps:

[0049] E1, obtaining corresponding reactive power data from the node power data of each distribution node;

[0050] E2, obtaining reactive compensation power data of each distribution node through the reactive compensation module within the sampling time and calculating the corresponding average reactive compensation power by averaging;

[0051] E3, calculate the corresponding average reactive power based on the reactive power data of each distribution node and define it as the average reactive power of this level;

[0052] E4, calculate the actual reactive power of this level by summing the average reactive compensation power of the distribution node and the average reactive power of this level;

[0053] E5, calculating the corresponding lower-level average reactive power by averaging the reactive power data of each lower-level distribution node corresponding to the distribution node;

[0054] E6, obtaining reactive compensation power data of each lower-level power distribution node through the reactive compensation module within the sampling time and calculating the corresponding average reactive compensation power by averaging;

[0055] E7, calculating the lower-level actual reactive power according to the sum of the average reactive compensation power of the lower-level distribution node and the lower-level average reactive power;

[0056] E8, calculating the lower-level actual total reactive power by summing the lower-level actual reactive powers of the lower-level distribution nodes corresponding to the distribution node;

[0057] E9, calculates the corresponding node reactive power loss ratio based on the actual reactive power of this level and the actual total reactive power of the lower level;

[0058] E10, if the node reactive power loss ratio of the distribution node is greater than a preset reactive power loss ratio threshold, the distribution node is defined as a reactive power loss abnormal node.

[0059] By adopting the above technical solution, the urban distribution network automation system can calculate the reactive loss ratio between each distribution node and its subordinate distribution node by comprehensively considering reactive power and reactive compensation power, and can identify nodes with abnormal reactive power, which is helpful to discover deep-seated distribution network problems or equipment failures, provide clear problem location for operation and maintenance personnel, and then quickly troubleshoot problems, thereby improving the energy efficiency and stability of the distribution network.

[0060] Optionally, the urban distribution network automation system further includes a node abnormality response strategy, and the node abnormality response strategy includes the following steps:

[0061] F1, determining the corresponding lower-level power distribution nodes according to the abnormal active power loss node or the abnormal reactive power loss node;

[0062] F2, obtain the node target power factor of each lower-level power distribution node and define it as the current target power factor;

[0063] F3, calculating the corresponding target power factor compensation update value according to the sum of the preset power factor abnormality compensation value and the current target power factor of each lower-level power distribution node;

[0064] F4, updating the node target power factor according to the target power factor compensation update value corresponding to each lower-level power distribution node.

[0065] By adopting the above technical solution, the urban distribution network automation system can reduce the damage caused by abnormal situations by adjusting the target power factor of the subordinate distribution nodes of the abnormal nodes, and maintain the stability of the distribution network before the staff conducts inspection and maintenance, thereby reducing the further development of abnormal situations and further damage to equipment.

[0066] Optionally, the power distribution load regulation strategy further comprises the following steps:

[0067] G1, if the node load rate of the distribution node is greater than the preset warning threshold, obtain the node target power factor of each lower-level distribution node corresponding to the distribution node;

[0068] G2, calculates the power factor adjustment margin value corresponding to each lower-level distribution node according to the difference between the preset power factor marginal threshold and the node target power factor;

[0069] G3: If the power factor adjustment margin value is less than a preset adjustment margin threshold, the central control module sends a corresponding self-reactive power compensation notification to each lower-level distribution node of the distribution node through the data communication module.

[0070] By adopting the above technical solution, the urban distribution network automation system can achieve more refined and preventive load management through warning thresholds and power factor adjustment margins. It can take action in advance when the load reaches the warning level and prevent possible overload conditions by evaluating the power factor adjustment potential of the lower-level nodes. When the adjustment margin is insufficient, the system will automatically send a reactive power compensation notification to prompt the lower-level nodes to actively perform self-adjustment, which can not only disperse the load pressure more effectively, but also improve the response speed and flexibility of the entire network, and help stabilize the operation of the distribution network.

[0071] In summary, the present application includes at least one of the following beneficial technical effects:

[0072] 1. By integrating functional modules such as data acquisition, communication, reactive power compensation and central control, reactive power compensation can be performed on distribution nodes at various voltage levels of the distribution network, thereby improving the overall distribution quality of the distribution network and reducing line losses.

[0073] 2. The power factor of each distribution node can be adjusted by adopting a hierarchical, low-to-high reactive power compensation method, taking into account the load conditions of the three-level nodes. Compensation is only performed when the load reaches a certain level to avoid reactive power reverse transmission. This can improve the power factor of the distribution network, reduce reactive power loss, optimize power transmission efficiency, and also adapt to dynamic changes in the distribution network load.

[0074] 3. The reactive power compensation period can be determined through historical data, and reactive power compensation can be performed when necessary, avoiding unnecessary compensation operations and reducing the risk of reactive power reverse transmission. BRIEF DESCRIPTION OF THE DRAWINGS

[0075] Figure 1 It is a schematic diagram of the principle of a city distribution network automation system of the present invention.

[0076] Figure 2 It is a process schematic diagram of a city distribution network automation system of the present invention. DETAILED DESCRIPTION

[0077] In order to make the purpose, technical solution and advantages of the present application more clearly understood, the present application 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 application and are not used to limit the present application.

[0078] The embodiments of the present application are further described in detail below in conjunction with the drawings in the specification.

[0079] refer to Figure 1 The present invention provides an urban distribution network automation system for automatically adjusting the power factor of each distribution node in the distribution network to improve the distribution quality of the distribution network.

[0080] The urban distribution network automation system comprises:

[0081] The distribution network data collection module 10 is used to collect node power data of each distribution node in the distribution network;

[0082] The data communication module 20 is used for data communication between the modules;

[0083] The reactive power compensation module 30 is used to controllably perform reactive power compensation on each power distribution node;

[0084] A central control module 40, used for processing data and issuing control instructions to the reactive power compensation module 30;

[0085] The distribution network data acquisition module 10 is connected to the data communication module 20 for communication, the reactive power compensation module 30 is connected to the data communication module 20 for communication, and the central control module 40 is connected to the data communication module 20 for communication;

[0086] Among them, the reactive power compensation module 30 includes a primary node reactive power compensation module 31, a secondary node reactive power compensation module 32 and a tertiary node reactive power compensation module 33, and the primary node reactive power compensation module 31, the secondary node reactive power compensation module 32 and the tertiary node reactive power compensation module 33 are distributed and controlled to be connected to the central control module 40.

[0087] The power distribution network data acquisition module 10 is mainly used to collect power data of each distribution node in the power distribution network for processing and analysis by the central control module 40 .

[0088] The data communication module 20 is mainly used for data communication and sending and receiving instructions between modules.

[0089] The reactive power compensation module 30 is mainly used to compensate reactive power for each distribution node in the distribution network, so as to improve the power factor of the distribution node and further improve the power quality of the distribution network.

[0090] The central control module 40 is used to process the received data and send control instructions to specific modules or blocks through the data communication module 20.

[0091] The primary node reactive power compensation module 31 is mainly used to compensate reactive power of high-voltage distribution nodes in the distribution network;

[0092] High-voltage nodes are usually distribution nodes with voltage levels such as 110kV, 66kV or 35kV, such as large substations.

[0093] The secondary node reactive power compensation module 32 is mainly used to compensate the reactive power of the medium voltage distribution nodes in the distribution network;

[0094] A medium voltage node is usually a distribution node with a voltage level of 10 kV or 20 kV, such as a distribution station, subway station, factory, community, etc.

[0095] The three-level node reactive power compensation module 33 is mainly used to compensate the reactive power of the low-voltage distribution nodes in the distribution network;

[0096] Low-voltage nodes are usually at a voltage level of 220V or 380V, such as distribution boxes in residential areas and distribution boxes in factory workshops.

[0097] The reactive power compensation module can be implemented by a variety of devices, for example, a phase regulator, a static VAR compensator (SVC), and a static VAR generator (SVG).

[0098] Preferably, the high-voltage node reactive power compensation module 31, the medium-voltage node reactive power compensation module 32 and the low-voltage node reactive power compensation module 33 are static reactive power generation devices (SVG).

[0099] Through the above technical solutions, the urban distribution network automation system can integrate functional modules such as data acquisition, communication, reactive power compensation and central control to perform reactive power compensation on distribution nodes at various voltage levels of the distribution network, thereby improving the overall distribution quality of the distribution network and reducing line losses.

[0100] Further, refer to Figure 2 The urban distribution network automation system further includes a power factor adjustment strategy, and the power factor adjustment strategy includes the following steps:

[0101] A1, collecting corresponding node power data at each distribution node of a preset distribution network through the distribution network data collection module 10 within a preset sampling time;

[0102] The sampling duration is a pre-set duration used to determine the time range for collecting data;

[0103] Node power data refers to power-related data corresponding to each distribution node of the distribution network. For example, it may include data directly related to power, such as voltage value, current value, apparent power, active power, reactive power, power factor, power factor angle, etc. It may also be data indirectly related to power, such as temperature, magnetic field, noise, etc. of the distribution equipment.

[0104] A2, transmitting node power data to the central control module 40 through the data communication module 20;

[0105] The collected node power data of all power distribution nodes are sent to the central control module 40 for analysis and processing.

[0106] A3, the central control module 40 determines each primary distribution node, secondary distribution node and tertiary distribution node according to the preset distribution network topology data;

[0107] The distribution network topology data is data of the pre-determined topological relationship between the distribution nodes of the distribution network and the self-information of each distribution node;

[0108] The first-level distribution node is a distribution node with a higher voltage level, that is, a high-voltage distribution node, for example, a distribution node with a voltage level of 110kV, 66kV or 35kV;

[0109] The secondary distribution node is a distribution node with a medium voltage level, that is, a medium voltage distribution node, for example, a distribution node with a voltage level of 10kV or 20kV;

[0110] The three-voltage distribution node is a distribution node with a lower voltage level, that is, a low-voltage distribution node, for example, a distribution node with a voltage level of 220V or 380V;

[0111] Typically, electric power is transmitted from a primary distribution node to multiple secondary distribution nodes, and after being transformed at each secondary distribution node, the electric power is transmitted to multiple tertiary distribution nodes.

[0112] A4, obtaining the apparent power data and power factor data of each third-level distribution node based on the node power data, and calculating the corresponding apparent power average value and power factor average value;

[0113] The apparent power data is the collected data of the apparent power corresponding to the node power data;

[0114] The power factor data is the collected data of the corresponding power factor in the node power data;

[0115] The apparent power mean is the average value calculated from the apparent power data;

[0116] The power factor mean is the average value calculated from the power factor data;

[0117] The average apparent power and the average power factor can be the arithmetic average or the weighted average.

[0118] A5, if the average apparent power of the three-level distribution node is not less than the preset three-level apparent power threshold, and the average power factor of the three-level distribution node is less than the corresponding node target power factor, then in the reactive power compensation period corresponding to the three-level distribution node, the three-level node reactive power compensation module 33 connected to the three-level distribution node is used to perform reactive power compensation on the three-level distribution node to adjust the average power factor of the three-level distribution node to the corresponding node target power factor;

[0119] The third-level apparent power threshold is a pre-set reference value used to judge the load condition of the third-level distribution node. When the load of the third-level distribution node is low, reactive power compensation may cause reactive power reverse transmission and affect the distribution network. The third-level apparent power threshold can be set based on experience or historical data;

[0120] The node target power factor is the power factor that each distribution node needs to achieve. Different node target power factors can be set according to different distribution nodes. For example, for the third-level distribution node, that is, the node target power factor of the low-voltage distribution node is usually set to 0.85 or 0.9, etc., and for the second-level distribution node and the first-level distribution node, that is, the medium-voltage distribution node and the high-voltage distribution node, the node target power factor is usually set to 0.95;

[0121] The node target power factor of each distribution node can be adjusted and changed as needed to adapt to different distribution network conditions.

[0122] The reactive power compensation period is the time period for reactive power compensation corresponding to each distribution node. Due to different electricity consumption habits, the load periods of different distribution nodes may also be different. Especially during the period when the distribution load is at a low point, if reactive power compensation is performed, there may be a risk of reactive power reverse transmission, which will affect the distribution network.

[0123] The reactive power compensation period can be analyzed and judged based on the historical data of each distribution node.

[0124] A6, obtaining the power factor data of each secondary distribution node based on the node power data, and calculating the corresponding power factor average value;

[0125] Calculate the average power factor of each secondary distribution node.

[0126] A7, if the average power factor of the secondary distribution node is less than the corresponding node target power factor, the secondary distribution node is subjected to reactive power compensation by the secondary node reactive power compensation module 32 connected to the secondary distribution node to adjust the average power factor of the secondary distribution node to the corresponding node target power factor;

[0127] Reactive power compensation is performed on each secondary distribution node according to the average power factor of each secondary distribution node.

[0128] A8, obtaining the power factor data of each primary distribution node based on the node power data, and calculating the corresponding power factor average value;

[0129] Calculate the average power factor of each primary distribution node.

[0130] A9, if the average power factor of the primary distribution node is less than the corresponding node target power factor, the primary distribution node is subjected to reactive power compensation by the primary node reactive power compensation module 31 connected to the primary distribution node to adjust the average power factor of the primary distribution node to the corresponding node target power factor;

[0131] Reactive power compensation is performed on each primary distribution node according to the average power factor of each primary distribution node.

[0132] Through the above steps, the urban distribution network automation system can adjust the power factor of each distribution node by adopting a hierarchical, low-to-high reactive power compensation method, taking into account the load conditions of the three-level nodes, and only compensate when the load reaches a certain level to avoid reactive reverse transmission. It can improve the power factor of the distribution network, reduce reactive power loss, optimize power transmission efficiency, and also adapt to dynamic changes in the distribution network load.

[0133] Furthermore, the power factor adjustment strategy further includes the following steps for determining the reactive power compensation period of each third-level power distribution node:

[0134] B1, obtaining historical power data of each third-level distribution node from a preset power database according to a preset retrospective analysis window;

[0135] The retrospective analysis window is a pre-set data sampling time window used to obtain data within the set time range;

[0136] The power database is a pre-set database used to store various power-related information data, such as identification information, geographical location, topological relationship of each distribution node, and historically collected power data;

[0137] The historical power data refers to the power data of the distribution nodes collected in the past in the retrospective analysis window;

[0138] For example, if the retrospective analysis window is set to 7 days, the historical power data is the power data of the distribution nodes collected in the past 7 days.

[0139] B2, obtaining corresponding historical reactive power data according to the historical power data corresponding to each third-level distribution node;

[0140] The historical reactive power data is the historical data of reactive power of distribution nodes in the historical power data.

[0141] B3, determine the reactive power valley period corresponding to each third-level distribution node based on historical reactive power data analysis;

[0142] The reactive power valley period is the period when the reactive power of the distribution node is low, which can be determined by specific algorithm analysis or manually. Usually, there is a certain regularity in the electricity consumption of electricity users. By analyzing historical data, the corresponding habitual period of reactive power can be determined to avoid reactive power compensation during this period, so as to reduce the risk of reactive reverse transmission.

[0143] By generating a time-series chart based on the historical reactive power data of each third-level distribution node, the valley moment of reactive power can be easily identified, and an available reactive power valley period can be determined by setting a threshold of a corresponding time range before and after the valley moment.

[0144] B4, determining the reactive power active period corresponding to each third-level distribution node according to the reactive power off-peak period;

[0145] The reactive power active period is the corresponding period in the retrospective analysis window excluding the reactive power low period, that is, the period during which reactive power compensation can be performed.

[0146] B5, define the reactive power active period of each third-level distribution node as the reactive power compensation period.

[0147] The reactive power compensation period is the period when reactive power is active.

[0148] Through the above steps, the urban distribution network automation system can determine the available reactive power compensation period through historical data and perform reactive power compensation when necessary, thus avoiding unnecessary compensation operations and reducing the risk of reactive power reverse transmission.

[0149] Furthermore, the urban distribution network automation system further includes a distribution load regulation strategy, and the distribution load regulation strategy includes the following steps:

[0150] C1, obtain the rated load value of each distribution node from the power database;

[0151] The rated load value is the rated maximum load value of each distribution node, for example, the maximum design capacity of a substation, transformer substation, or distribution box.

[0152] C2, obtaining corresponding apparent power data from the node power data of each distribution node;

[0153] C3, calculating the corresponding apparent power mean value according to the corresponding apparent power data;

[0154] The apparent power mean is the average value of the apparent power data, which can be an arithmetic mean or a weighted mean.

[0155] C4, calculates the corresponding node load rate based on the apparent power average and rated load value;

[0156] The node load rate is the load rate of each distribution node, which can be obtained by dividing the average apparent power by the rated load value, reflecting the current load condition of the distribution node.

[0157] C5, determining the lower-level distribution nodes connected to each distribution node according to the distribution network topology data;

[0158] The distribution network topology data is the connection relationship data between the distribution nodes in the distribution network that is predetermined;

[0159] The lower-level distribution node is a lower-level distribution node in the power transmission direction of the distribution node. For example, the lower-level distribution node corresponding to the first-level distribution node is the second-level distribution node, and the lower-level distribution node corresponding to the second-level distribution node is the third-level distribution node.

[0160] The subordinate distribution nodes of each distribution node can be conveniently determined through the topological data of the distribution network.

[0161] C6, respectively obtain the node target power factor of each lower-level distribution node corresponding to each distribution node and define it as the current target power factor;

[0162] The current target power factor is the node target power factor currently set for each lower-level power distribution node.

[0163] C7, if the node load rate of the distribution node is greater than the preset overload threshold, the corresponding target power factor update value is calculated based on the sum of the preset power factor adjustment value and the current target power factor of each lower-level distribution node;

[0164] The heavy load threshold is a preset reference value used to determine whether the distribution node is under heavy load. For example, the heavy load threshold is set to 60%. When the node load rate is greater than 60%, it can be considered as being under heavy load.

[0165] The power factor adjustment value is a preset adjustment value used to additionally adjust the node target power factor of the power distribution node;

[0166] The target power factor update value is the sum of the current target power factor and the power factor adjustment value, which is used to update and replace the current point target power factor of the lower-level distribution node when the distribution node is heavily loaded;

[0167] The target power factor update value should be less than 1, preferably less than or equal to 0.98;

[0168] For example, the overload threshold is set to 60%, the power factor adjustment value is set to 0.1, and the node load rate of a secondary distribution node reaches 65%. Then, the target power factor of each tertiary distribution node connected to the secondary distribution node is increased by 0.1, and reactive power compensation is performed on each tertiary distribution node according to the target power factor. If the node load rate is still not lower than 60%, the target power factor of each tertiary distribution node is increased by 0.1 again, until the node load rate is not lower than 60% or the target power factor of each tertiary distribution node reaches the set maximum value, such as 0.98 mentioned above.

[0169] By improving the power factor of each lower-level power distribution, the apparent power of each lower-level node can be reduced, thereby reducing the current value of each lower-level node, and then reducing the apparent power of the distribution node at this level to reduce its load rate.

[0170] C8, updating the node target power factor according to the target power factor update value corresponding to each lower-level distribution node;

[0171] The target power factor update value corresponding to each lower-level power distribution node is assigned to the node target power factor.

[0172] Through the above steps, the urban distribution network automation system can realize adaptive optimization of distribution load by dynamically monitoring and adjusting the load rate and power factor of distribution nodes, reduce load pressure by identifying heavy load conditions and adjusting the target power factor of lower-level nodes, prevent overload problems, and improve the operating efficiency and stability of the entire distribution network.

[0173] Furthermore, the urban distribution network automation system further includes a distribution node abnormality analysis strategy, and the distribution node abnormality analysis strategy includes the following steps:

[0174] D1, obtaining corresponding active power data from the node power data of each distribution node;

[0175] The active power data is the collected data of the active power in the node power data of each distribution node.

[0176] D2, calculate the corresponding average active power according to the average active power data of each distribution node and define it as the average active power of this level;

[0177] The average active power is the average value of the active power data of each distribution node, which can be an arithmetic mean or a weighted average;

[0178] The average active power at this level is the average active power of each distribution node.

[0179] D3, calculating the corresponding average active power according to the active power data of each lower-level distribution node corresponding to the distribution node and defining it as the lower-level average active power;

[0180] The lower-level average active power is the average active power of each lower-level distribution node corresponding to each distribution node.

[0181] D4, calculating the lower-level total active power by summing the lower-level average active powers of all lower-level distribution nodes corresponding to the distribution node;

[0182] The lower-level total active power is the sum of the lower-level average active powers of all lower-level distribution nodes corresponding to the distribution node.

[0183] D5, calculate the corresponding node active power loss ratio according to the average active power of this level and the total active power of the lower level;

[0184] The node active power loss ratio is the ratio of active power loss between the distribution node and all corresponding lower-level distribution nodes, which is used to reflect the proportion of active power loss generated by the distribution node when distributing power to each lower-level distribution node;

[0185] The corresponding active power loss can be calculated by subtracting the total active power of the lower level from the average active power of the current level, and then the active power loss ratio of the node can be obtained by dividing the active power loss by the average active power of the current level.

[0186] D6, if the node active power loss ratio of the distribution node is greater than the preset active power loss ratio threshold, the distribution node is defined as an abnormal active power loss node;

[0187] The active power loss ratio threshold is a pre-set reference value used to determine the active power loss ratio of the distribution node. The active power loss ratio threshold can be set based on historical data or experience.

[0188] The abnormal active power loss node is a distribution node whose active power loss ratio is too high.

[0189] By referring to the active power loss ratio, abnormal active power loss can be discovered, and the corresponding power distribution abnormality can be determined. For example, a sudden increase in active power loss may indicate a decrease in equipment insulation performance, an increase in contact resistance, an increase in friction of mechanical parts, etc. This allows maintenance personnel to determine the scope of investigation for the corresponding problem and improve the efficiency of investigation and repair.

[0190] Through the above steps, the urban distribution network automation system can calculate and monitor the active power loss ratio of each distribution node by comparing the active power data of each distribution node with its subordinate distribution nodes, thereby effectively identifying abnormal nodes related to active power loss, and can quickly locate problem nodes in the distribution network, which helps to promptly discover nodes or lines with excessive power loss, improve maintenance efficiency and accuracy, and prevent potential equipment failures, extend equipment life, and improve the reliability and economy of the entire distribution network.

[0191] Furthermore, the power distribution node abnormality analysis strategy further includes the following steps:

[0192] E1, obtaining corresponding reactive power data from the node power data of each distribution node;

[0193] The reactive power data is data on reactive power in the node power data of each power distribution node.

[0194] E2, obtaining reactive compensation power data of each distribution node through the reactive compensation module 30 within the sampling time and calculating the corresponding average reactive compensation power by averaging;

[0195] The reactive power compensation data is the compensation power data obtained when the reactive power compensation module 30 performs reactive power compensation on each power distribution node;

[0196] The average reactive compensation power is the average value of reactive compensation power data of each distribution node, which can be an arithmetic mean or a weighted mean.

[0197] E3, calculate the corresponding average reactive power based on the reactive power data of each distribution node and define it as the average reactive power of this level;

[0198] The average reactive power is the average value of the reactive power data of each distribution node, which can be the arithmetic mean or the weighted mean;

[0199] The average reactive power level at this level is the average reactive power of each distribution node.

[0200] E4, calculate the actual reactive power of this level by summing the average reactive compensation power of the distribution node and the average reactive power of this level;

[0201] The actual reactive power at this level is the sum of the average reactive compensation power and the average reactive power at this level, reflecting the actual reactive power of the distribution node before reactive compensation.

[0202] E5, calculating the corresponding lower-level average reactive power by averaging the reactive power data of each lower-level distribution node corresponding to the distribution node;

[0203] The lower-level average reactive power is the average value of the reactive power data of each lower-level distribution node, which can be an arithmetic average or a weighted average.

[0204] E6, obtaining reactive compensation power data of each lower-level power distribution node through the reactive compensation module 30 within the sampling time and calculating the corresponding average reactive compensation power by averaging;

[0205] Calculate the average reactive compensation power of each lower-level distribution node.

[0206] E7, calculating the lower-level actual reactive power according to the sum of the average reactive compensation power of the lower-level distribution node and the lower-level average reactive power;

[0207] The lower-level actual reactive power is the sum of the average reactive compensation power of the lower-level distribution node and the lower-level average reactive power, reflecting the actual reactive power of each lower-level distribution node before reactive compensation.

[0208] E8, calculating the lower-level actual total reactive power by summing the lower-level actual reactive powers of the lower-level distribution nodes corresponding to the distribution node;

[0209] The actual total reactive power is the sum of the lower-level actual reactive powers of each lower-level distribution node of the distribution node.

[0210] E9, calculates the corresponding node reactive power loss ratio based on the actual reactive power of this level and the actual total reactive power of the lower level;

[0211] The node reactive power loss ratio is the ratio of reactive power loss between the distribution node and all corresponding lower-level distribution nodes, which is used to reflect the proportion of reactive power loss generated by the distribution node when distributing power to each lower-level distribution node.

[0212] The corresponding reactive loss power can be calculated by subtracting the actual total reactive power of the lower level from the average actual reactive power of the current level, and then the reactive loss power is divided by the actual average reactive power of the current level to obtain the node reactive loss ratio.

[0213] E10, if the node reactive power loss ratio of the distribution node is greater than a preset reactive power loss ratio threshold, the distribution node is defined as a reactive power loss abnormal node.

[0214] The reactive power loss ratio threshold is a pre-set reference value used to determine the reactive power loss ratio of the power distribution node. The reactive power loss ratio threshold can be set based on historical data or experience.

[0215] The reactive power loss abnormal node is a distribution node with an excessively high active power loss ratio.

[0216] By referring to the reactive power loss ratio, abnormal reactive power loss can be discovered, and the corresponding power distribution abnormality can be determined. For example, changes in reactive power loss may indicate changes in inductance or capacitance characteristics, magnetic circuit problems, changes in insulation performance, and other issues.

[0217] Through the above steps, the urban distribution network automation system can calculate the reactive loss ratio between each distribution node and its subordinate distribution node by comprehensively considering reactive power and reactive compensation power, and can identify nodes with abnormal reactive power, which is helpful to discover deep-seated distribution network problems or equipment failures, provide clear problem location for operation and maintenance personnel, and then quickly troubleshoot problems, thereby improving the energy efficiency and stability of the distribution network.

[0218] Furthermore, the urban distribution network automation system further includes a node abnormality response strategy, and the node abnormality response strategy includes the following steps:

[0219] F1, determining the corresponding lower-level power distribution nodes according to the abnormal active power loss node or the abnormal reactive power loss node;

[0220] Determine all lower-level power distribution nodes corresponding to the abnormal power distribution node.

[0221] F2, obtain the node target power factor of each lower-level power distribution node and define it as the current target power factor;

[0222] Get the current node target power factor of each lower-level power distribution node.

[0223] F3, calculating the corresponding target power factor compensation update value according to the sum of the preset power factor abnormality compensation value and the current target power factor of each lower-level power distribution node;

[0224] The power factor abnormality compensation value is a preset adjustment value, which is used to adjust the power factor of the subordinate nodes of the abnormal distribution node. For example, by improving the power factor of each subordinate distribution node of the abnormal node, on the one hand, the current between the distribution node and its subordinate distribution node can be reduced, thereby reducing the reactive power loss or active power loss caused by the abnormality, because the active power loss and reactive power loss are usually proportional to the square of the current. On the other hand, the load pressure of the abnormal distribution node can be reduced to avoid further development of the abnormal situation or further damage to the equipment, so as to maintain the stability of the distribution line before the staff conducts investigation and maintenance;

[0225] The target power factor compensation update value is the sum of the current target power factor of the lower-level distribution node and the power factor abnormality compensation value, and is used to update the current node target power factor of the lower-level distribution node.

[0226] F4, updating the node target power factor according to the target power factor compensation update value corresponding to each lower-level power distribution node;

[0227] The target power factor compensation update value corresponding to each lower-level distribution node is assigned to the node target power factor.

[0228] Through the above steps, the urban distribution network automation system can reduce the damage caused by abnormal situations by adjusting the target power factor of the subordinate distribution nodes of the abnormal nodes, maintain the stability of the distribution network before the staff conducts investigation and maintenance, and reduce the further development of abnormal situations and further damage to equipment.

[0229] Furthermore, the distribution load regulation strategy further comprises the following steps:

[0230] G1, if the node load rate of the distribution node is greater than the preset warning threshold, obtain the node target power factor of each lower-level distribution node corresponding to the distribution node;

[0231] The warning threshold is a pre-set reference value used to determine whether the load of the distribution node has reached a point where further intervention is required. For example, the warning threshold can be set to 80%, which means that when the node load rate of the distribution node is greater than 80%, further action is required to adjust its load rate.

[0232] G2, calculates the power factor adjustment margin value corresponding to each lower-level distribution node according to the difference between the preset power factor marginal threshold and the node target power factor;

[0233] The power factor marginal threshold is a preset reference value used to limit the maximum value of the node target power factor. For example, if the power factor marginal threshold is set to 0.98, the node target power factor cannot exceed 0.98. On the one hand, the closer the power factor is to 1, the higher the reactive power compensation cost is. On the other hand, it is more likely to cause reactive power reverse transmission. Therefore, the node target power factor needs to be limited to a value closer to 1.

[0234] The power factor adjustment margin value is the difference between the power factor marginal threshold and the node target power factor, reflecting the remaining adjustment space of the power factor.

[0235] G3, if the power factor adjustment margin value is less than the preset adjustment margin threshold, the central control module 40 sends a corresponding self-reactive power compensation notification to each lower-level distribution node of the distribution node through the data communication module 20;

[0236] The adjustment margin threshold is a preset reference value used to determine the size of the remaining adjustment space for the power factor;

[0237] The autonomous reactive power compensation notification is a pre-set notification message used to inform each lower-level distribution node to perform autonomous reactive power compensation. For example, for a factory, an additional reactive power step device is turned on to perform on-site reactive power compensation for workshop production equipment to reduce the reactive power compensation pressure of the distribution node.

[0238] Through the above steps, the urban distribution network automation system can achieve more refined and preventive load management through warning thresholds and power factor adjustment margins. It can take action in advance when the load reaches the warning level and prevent possible overload conditions by evaluating the power factor adjustment potential of the lower-level nodes. When the adjustment margin is insufficient, the system will automatically send a reactive power compensation notification to prompt the lower-level nodes to actively perform self-adjustment, which can not only disperse the load pressure more effectively, but also improve the response speed and flexibility of the entire network, and help stabilize the operation of the distribution network.

[0239] The above are all preferred embodiments of the present application, and are not intended to limit the protection scope of the present application. Any feature disclosed in this specification (including the abstract and drawings), unless otherwise stated, can be replaced by other equivalent or alternative features with similar purposes. That is, unless otherwise stated, each feature is only an example of a series of equivalent or similar features.

Claims

1. An urban distribution network automation system, characterized in that: include: The distribution network data collection module is used to collect node power data of each distribution node in the distribution network; Data communication module, used for data communication between modules; Reactive power compensation module, used to controllably perform reactive power compensation on each distribution node; A central control module, used for processing data and issuing control instructions to the reactive power compensation module; Wherein, the distribution network data acquisition module is communicatively connected to the data communication module, the reactive power compensation module is communicatively connected to the data communication module, and the central control module is communicatively connected to the data communication module; Wherein, the reactive power compensation module includes a primary node reactive power compensation module, a secondary node reactive power compensation module and a tertiary node reactive power compensation module, and the primary node reactive power compensation module, the secondary node reactive power compensation module and the tertiary node reactive power compensation module are distributed and controlled to be connected to the central control module; Wherein, the urban distribution network automation system further includes a power factor adjustment strategy, and the power factor adjustment strategy includes the following steps: A1, collecting corresponding node power data at each distribution node of a preset distribution network through the distribution network data collection module within a preset sampling time; A2, transmitting node power data to the central control module through the data communication module; A3, the central control module determines each primary distribution node, secondary distribution node and tertiary distribution node according to the preset distribution network topology data; A4, obtaining the apparent power data and power factor data of each third-level distribution node based on the node power data, and calculating the corresponding apparent power average value and power factor average value; A5, if the average apparent power of the three-level distribution node is not less than the preset three-level apparent power threshold, and the average power factor of the three-level distribution node is less than the corresponding node target power factor, then in the reactive power compensation period corresponding to the three-level distribution node, the three-level node reactive power compensation module connected to the three-level distribution node is used to perform reactive power compensation on the three-level distribution node to adjust the average power factor of the three-level distribution node to the corresponding node target power factor; A6, obtaining the power factor data of each secondary distribution node based on the node power data, and calculating the corresponding power factor average value; A7: If the average power factor of the secondary distribution node is less than the corresponding node target power factor, the secondary distribution node is subjected to reactive power compensation by the secondary node reactive power compensation module connected to the secondary distribution node to adjust the average power factor of the secondary distribution node to the corresponding node target power factor; A8, obtaining the power factor data of each primary distribution node based on the node power data, and calculating the corresponding power factor average value; A9: If the average power factor of the primary distribution node is less than the corresponding node target power factor, the primary distribution node is subjected to reactive power compensation by the primary node reactive power compensation module connected to the primary distribution node to adjust the average power factor of the primary distribution node to the corresponding node target power factor; The urban distribution network automation system further includes a distribution load regulation strategy, which includes the following steps: C1, obtain the rated load value of each distribution node from the power database; C2, obtaining corresponding apparent power data from the node power data of each distribution node; C3, calculating the corresponding apparent power mean value according to the corresponding apparent power data; C4, calculates the corresponding node load rate based on the apparent power average and rated load value; C5, determining the lower-level distribution nodes connected to each distribution node according to the distribution network topology data; C6, respectively obtain the node target power factor of each lower-level distribution node corresponding to each distribution node and define it as the current target power factor; C7, if the node load rate of the distribution node is greater than the preset overload threshold, the corresponding target power factor update value is calculated based on the sum of the preset power factor adjustment value and the current target power factor of each lower-level distribution node; C8, updating the node target power factor according to the target power factor update value corresponding to each lower-level power distribution node.

2. The urban distribution network automation system according to claim 1, characterized in that: The power factor adjustment strategy further includes the following steps for determining the reactive power compensation period of each third-level distribution node: B1, obtaining historical power data of each third-level distribution node from a preset power database according to a preset retrospective analysis window; B2, obtaining corresponding historical reactive power data according to the historical power data corresponding to each third-level distribution node; B3, determine the reactive power valley period corresponding to each third-level distribution node based on historical reactive power data analysis; B4, determining the reactive power active period corresponding to each third-level distribution node according to the reactive power off-peak period; B5, define the reactive power active period of each third-level distribution node as the reactive power compensation period.

3. The urban distribution network automation system according to claim 2, characterized in that: Further comprising a distribution node abnormality analysis strategy, the distribution node abnormality analysis strategy comprising the following steps: D1, obtaining corresponding active power data from the node power data of each distribution node; D2, calculate the corresponding average active power according to the average active power data of each distribution node and define it as the average active power of this level; D3, calculating the corresponding average active power according to the active power data of each lower-level distribution node corresponding to the distribution node and defining it as the lower-level average active power; D4, calculating the lower-level total active power by summing the lower-level average active powers of all lower-level distribution nodes corresponding to the distribution node; D5, calculate the corresponding node active power loss ratio according to the average active power of this level and the total active power of the lower level; D6: If the node active power loss ratio of the distribution node is greater than a preset active power loss ratio threshold, the distribution node is defined as an abnormal active power loss node.

4. The urban distribution network automation system according to claim 3, characterized in that: The power distribution node abnormality analysis strategy further includes the following steps: E1, obtaining corresponding reactive power data from the node power data of each distribution node; E2, obtaining reactive compensation power data of each distribution node through the reactive compensation module within the sampling time and calculating the corresponding average reactive compensation power by averaging; E3, calculate the corresponding average reactive power based on the reactive power data of each distribution node and define it as the average reactive power of this level; E4, calculate the actual reactive power of this level by summing the average reactive compensation power of the distribution node and the average reactive power of this level; E5, calculating the corresponding lower-level average reactive power by averaging the reactive power data of each lower-level distribution node corresponding to the distribution node; E6, obtaining reactive compensation power data of each lower-level power distribution node through the reactive compensation module within the sampling time and calculating the corresponding average reactive compensation power by averaging; E7, calculating the lower-level actual reactive power according to the sum of the average reactive compensation power of the lower-level distribution node and the lower-level average reactive power; E8, calculating the lower-level actual total reactive power by summing the lower-level actual reactive powers of the lower-level distribution nodes corresponding to the distribution node; E9, calculates the corresponding node reactive power loss ratio based on the actual reactive power of this level and the actual total reactive power of the lower level; E10, if the node reactive power loss ratio of the distribution node is greater than a preset reactive power loss ratio threshold, the distribution node is defined as a reactive power loss abnormal node.

5. The urban distribution network automation system according to claim 4, characterized in that: It further includes a node abnormality response strategy, wherein the node abnormality response strategy The following steps are involved: F1, determining the corresponding lower-level power distribution nodes according to the abnormal active power loss node or the abnormal reactive power loss node; F2, obtain the node target power factor of each lower-level power distribution node and define it as the current target power factor; F3, calculating the corresponding target power factor compensation update value according to the sum of the preset power factor abnormality compensation value and the current target power factor of each lower-level power distribution node; F4, updating the node target power factor according to the target power factor compensation update value corresponding to each lower-level power distribution node.

6. The urban distribution network automation system according to claim 5, characterized in that: The distribution load regulation strategy further comprises the following steps: G1, if the node load rate of the distribution node is greater than the preset warning threshold, obtain the node target power factor of each lower-level distribution node corresponding to the distribution node; G2, calculates the power factor adjustment margin value corresponding to each lower-level distribution node according to the difference between the preset power factor marginal threshold and the node target power factor; G3: If the power factor adjustment margin value is less than a preset adjustment margin threshold, the central control module sends a corresponding self-reactive power compensation notification to each lower-level distribution node of the distribution node through the data communication module.

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