Power distribution network resource access method, equipment, medium and product

Abstract

The embodiment of the invention provides a power distribution network resource access method and device, a medium and a product. The method comprises the following steps: responding to access of power distribution network resources, wherein the power distribution network resources comprise at least one of photovoltaic power generation resources, thermal power generation resources and hydroelectric power generation resources; when the photovoltaic power generation resource is accessed, judging whether the photovoltaic voltage of the photovoltaic power generation resource reaches a preset voltage threshold value or not; if the photovoltaic voltage does not reach a preset voltage threshold value, the photovoltaic voltage is adjusted, so that the adjusted photovoltaic voltage reaches the preset voltage threshold value, and the preset voltage threshold value is determined according to the transmission voltage of the power distribution network. Through the method, the stability of the power distribution network can be effectively improved.

Description

Technical Field

[0001] This application relates to the field of power system technology, and in particular to a method, equipment, medium and product for accessing distribution network resources. Background Technology

[0002] In the power system, with the rapid development of renewable energy, photovoltaic power generation, as an important clean energy source, is increasingly being connected to the power grid.

[0003] In power distribution networks, compared to traditional thermal and hydropower generation, the output characteristics of photovoltaic (PV) power generation systems are highly dependent on environmental conditions, especially solar radiation intensity, temperature, and weather conditions. Because these factors are unpredictable, the PV voltage output can vary significantly, posing a challenge to the stable operation of the power grid. The grid needs to maintain a stable voltage to ensure reliable power supply and power quality. Summary of the Invention

[0004] This application provides a method, device, medium, and product for accessing distribution network resources, which can effectively improve the stability of the distribution network.

[0005] In a first aspect, embodiments of this application provide a method for accessing distribution network resources, comprising: responding to the access of distribution network resources, wherein the distribution network resources include at least one of photovoltaic power generation resources, thermal power generation resources, and hydropower generation resources; when accessing the photovoltaic power generation resources, determining whether the photovoltaic voltage of the photovoltaic power generation resources reaches a preset voltage threshold; if the photovoltaic voltage does not reach the preset voltage threshold, adjusting the photovoltaic voltage so that the adjusted photovoltaic voltage reaches the preset voltage threshold, wherein the preset voltage threshold is determined based on the transmission voltage of the distribution network.

[0006] In one embodiment, adjusting the photovoltaic voltage includes: when the photovoltaic voltage is lower than a preset voltage threshold, compensating the photovoltaic voltage to bring it up to the preset voltage threshold; and when the photovoltaic voltage is higher than the preset voltage threshold, reducing the photovoltaic voltage to bring it up to the preset voltage threshold.

[0007] In one embodiment, the method further includes: determining the total power generation corresponding to the currently connected distribution network resources based on the distribution network resources; and issuing an abnormality prompt message when the total power generation reaches the maximum carrying capacity of the distribution network, wherein the abnormality prompt message is used to indicate the suspension of access to photovoltaic power generation resources.

[0008] In one embodiment, the calculation method for the maximum carrying capacity of the distribution network includes: determining the current carrying capacity constraint of the distribution network based on the rated voltage of the lines and the continuous allowable current value of the lines; and calculating the maximum carrying capacity of the distribution network based on the current carrying capacity constraint, the active power and reactive power of the loads of the distribution network.

[0009] In one embodiment, the method further includes: when the total power generation does not reach the maximum carrying capacity of the distribution network, determining the effective carrying capacity of the photovoltaic power generation resource based on other distribution network resources currently connected to the distribution network besides the photovoltaic power generation resource; determining the power supply of the photovoltaic power generation resource based on the effective carrying capacity and a preset photovoltaic power generation time; and determining the number of photovoltaic panels based on the power supply of the photovoltaic power generation resource and the power generation of each photovoltaic panel in the photovoltaic power generation resource, wherein the number of photovoltaic panels is used to adjust the access of the photovoltaic power generation resource.

[0010] In one embodiment, the total power generation includes the power generation of photovoltaic power generation resources, and the calculation method for the power generation of photovoltaic power generation resources includes:

[0011] The light intensity of the photovoltaic module is determined based on the latitude and longitude information of the photovoltaic module corresponding to the photovoltaic power generation resource and the solar altitude angle.

[0012] The power generation capacity of the photovoltaic power generation resource is determined based on the light intensity and illumination time of the photovoltaic module.

[0013] In one embodiment, the method further includes:

[0014] Based on the access data of the distribution network resources, obtain the voltage fluctuation information of the distribution network, wherein the voltage fluctuation information includes voltage fluctuation values;

[0015] Based on the voltage fluctuation information, a voltage regulation strategy for adjusting the photovoltaic voltage is determined.

[0016] Secondly, this application provides an access device for distribution network resources, comprising:

[0017] A response module is used to respond to the access of distribution network resources, wherein the distribution network resources include at least one of photovoltaic power generation resources, thermal power generation resources and hydropower generation resources;

[0018] The judgment module is used to determine whether the photovoltaic voltage of the photovoltaic power generation resource reaches a preset voltage threshold when the photovoltaic power generation resource is connected.

[0019] An adjustment module is used to adjust the photovoltaic voltage if the photovoltaic voltage does not reach a preset voltage threshold, so that the adjusted photovoltaic voltage reaches the preset voltage threshold, wherein the preset voltage threshold is determined based on the transmission voltage of the distribution network.

[0020] In one embodiment, the adjustment module is specifically used to compensate the photovoltaic voltage when the photovoltaic voltage is lower than a preset voltage threshold, so that the photovoltaic voltage reaches the preset voltage threshold; and to reduce the photovoltaic voltage when the photovoltaic voltage is higher than the preset voltage threshold, so that the photovoltaic voltage reaches the preset voltage threshold.

[0021] In one embodiment, the device further includes:

[0022] The first determining module is used to determine the total power generation corresponding to the currently accessed distribution network resources;

[0023] The prompting module is used to issue an abnormal prompt message when the total power generation reaches the maximum carrying capacity of the distribution network. The abnormal prompt message is used to indicate the suspension of access to photovoltaic power generation resources.

[0024] In one embodiment, the calculation method for the maximum carrying capacity of the distribution network includes: determining the current carrying capacity constraint of the distribution network based on the rated voltage of the lines and the continuous allowable current value of the lines; and calculating the maximum carrying capacity of the distribution network based on the current carrying capacity constraint, the active power and reactive power of the loads of the distribution network.

[0025] In one embodiment, the device further includes:

[0026] The second determining module is used to determine the effective carrying capacity of the photovoltaic power generation resources based on the other distribution network resources currently connected to the distribution network, excluding photovoltaic power generation resources, when the total power generation capacity has not reached the maximum carrying capacity of the distribution network.

[0027] The third determining module is used to determine the power supply of the photovoltaic power generation resources based on the effective carrying capacity and the preset photovoltaic power generation time.

[0028] The fourth determining module is used to determine the number of photovoltaic power generation panels based on the power supply of the photovoltaic power generation resource and the power generation of each photovoltaic power generation panel in the photovoltaic power generation resource. The number of photovoltaic power generation panels is used to adjust the access of the photovoltaic power generation resource.

[0029] In one embodiment, the total power generation includes the power generation of photovoltaic power generation resources. The calculation method of the power generation of photovoltaic power generation resources includes: determining the irradiance of the photovoltaic module based on the latitude and longitude information and solar altitude angle of the photovoltaic module corresponding to the photovoltaic power generation resource; and determining the power generation of the photovoltaic power generation resource based on the irradiance and irradiance time of the photovoltaic module.

[0030] In one embodiment, the device further includes:

[0031] The acquisition module is used to acquire voltage fluctuation information of the distribution network based on the access data of the distribution network resources, wherein the voltage fluctuation information includes voltage fluctuation values;

[0032] The strategy adjustment module is used to determine a voltage regulation strategy for adjusting the photovoltaic voltage based on the voltage fluctuation information.

[0033] Thirdly, this application provides a device for accessing distribution network resources, comprising:

[0034] Includes: memory, processor;

[0035] The memory stores computer-executed instructions;

[0036] The processor executes computer execution instructions stored in the memory, causing the processor to perform the first aspect and / or various possible implementations of the first aspect as described above.

[0037] Fourthly, this application provides a computer-readable storage medium storing computer-executable instructions, which, when executed by a processor, are used to implement the first aspect and / or various possible embodiments of the first aspect described above.

[0038] Fifthly, embodiments of this application provide a computer program product, including a computer program that, when executed by a processor, implements the first aspect and / or various possible implementations of the first aspect.

[0039] The method, equipment, medium, and product for accessing power distribution network resources provided in this application, in response to the access of power distribution network resources, including at least one of photovoltaic power generation resources, thermal power generation resources, and hydropower generation resources, determine whether the photovoltaic voltage of the photovoltaic power generation resource reaches a preset voltage threshold when accessing the photovoltaic power generation resource. If the photovoltaic voltage does not reach the preset voltage threshold, the photovoltaic voltage is adjusted so that the adjusted photovoltaic voltage reaches the preset voltage threshold. The preset voltage threshold is determined based on the transmission voltage of the power distribution network. This application effectively solves the voltage stability problem of photovoltaic power by monitoring and adjusting the voltage of photovoltaic power generation resources during the power resource access process. Attached Figure Description

[0040] The accompanying drawings, which are incorporated in and form part of this specification, illustrate embodiments consistent with this application and, together with the description, serve to explain the principles of this application.

[0041] Figure 1 A possible scenario diagram provided for this application;

[0042] Figure 2 A flowchart illustrating a method for accessing distribution network resources provided in this application;

[0043] Figure 3 A flowchart illustrating another method for accessing distribution network resources provided in this application;

[0044] Figure 4 A flowchart illustrating another method for accessing distribution network resources provided in this application;

[0045] Figure 5 A schematic diagram of the structure of a power distribution network resource access device provided in this application;

[0046] Figure 6 This is a schematic diagram of the structure of a power distribution network resource access device provided in this application.

[0047] The accompanying drawings illustrate specific embodiments of this application, which will be described in more detail below. These drawings and descriptions are not intended to limit the scope of the concept in any way, but rather to illustrate the concept of this application to those skilled in the art through reference to particular embodiments. Detailed Implementation

[0048] Exemplary embodiments will now be described in detail, examples of which are illustrated in the accompanying drawings. When the following description relates to the drawings, unless otherwise indicated, the same numbers in different drawings denote the same or similar elements. The embodiments described in the following exemplary embodiments do not represent all embodiments consistent with this application. Rather, they are merely examples of apparatuses and methods consistent with some aspects of this application as detailed in the appended claims.

[0049] Figure 1 A possible scenario diagram provided for this application, such as Figure 1 As shown, the system may include a power grid resource access system 110, and photovoltaic power generation system 120, thermal power generation system 130, and hydropower generation system 140, which are electrically connected to the power grid resource access system 110 respectively. The power grid resource access system 110 connects to the power grid resources corresponding to the photovoltaic power generation system 120, thermal power generation system 130, or hydropower generation system 140, and supplies power. Optionally, the power grid resource access system 110 can coordinate these different types of power generation resources to achieve a stable power supply. For example, during periods of abundant sunshine, the photovoltaic power generation system 120 can be prioritized. At night or when sunlight is insufficient, the output of the thermal power generation system 130 can be increased; during seasons with abundant water resources, the hydropower generation system 140 can be fully utilized, and so on.

[0050] Based on the above scenarios, it can be seen that in existing technologies, power grid resource access systems typically coordinate and manage the power resources of various power generation systems. However, they neglect the fact that, compared to traditional thermal power generation and hydropower generation, the output characteristics of photovoltaic power generation systems are highly dependent on environmental conditions, which affects the stability of the power grid when photovoltaic power is connected.

[0051] The method for connecting distribution network resources provided in this application, in response to the connection of distribution network resources, including at least one of photovoltaic power generation resources, thermal power generation resources, and hydropower generation resources, determines whether the photovoltaic voltage of the photovoltaic power generation resource reaches a preset voltage threshold when connecting the photovoltaic power generation resource. If the photovoltaic voltage does not reach the preset voltage threshold, the photovoltaic voltage is adjusted so that the adjusted photovoltaic voltage reaches the preset voltage threshold. The preset voltage threshold is determined based on the transmission voltage of the distribution network. This embodiment of the application effectively solves the voltage stability problem of photovoltaic power by monitoring and adjusting the voltage of photovoltaic power generation resources during the power resource connection process.

[0052] The technical solution of this application and how the technical solution of this application solves the above-mentioned technical problems are described in detail below with specific embodiments. These specific embodiments can be combined with each other, and the same or similar concepts or processes may not be described again in some embodiments. The embodiments of this application will now be described with reference to the accompanying drawings.

[0053] Please refer to Figure 2 , Figure 2 This is a flowchart illustrating a method for accessing distribution network resources according to an embodiment of this application. The execution entity of the method can be... Figure 1 In the distribution network resource access system 110, such as Figure 2 As shown, the method includes steps S201-S203.

[0054] Step S201: In response to the access of distribution network resources, the distribution network resources include at least one of photovoltaic power generation resources, thermal power generation resources and hydropower generation resources.

[0055] In this embodiment, the system can connect to various power distribution network resources, such as photovoltaic power generation resources, thermal power generation resources, and hydropower generation resources. In one example, the system can automatically identify the type of resource connected through sensor data analysis. For example, the system is equipped with various sensors to monitor specific parameters of different power generation resources, such as the voltage and current characteristics of photovoltaic power generation systems, the temperature and fuel consumption of thermal power generation systems, and the water flow and pressure of hydropower generation systems. In another example, the system can also receive access signals from power distribution network resources, which carry the access type of the power distribution network resources.

[0056] Understandably, in response to, is used to indicate the conditions or states on which the operation being performed depends. When the conditions or states on which it depends are met, one or more operations being performed can be performed in real time or with a set delay. Unless otherwise specified, there is no restriction on the order in which the multiple operations being performed are executed.

[0057] Step S202: When connecting to photovoltaic power generation resources, determine whether the photovoltaic voltage of the photovoltaic power generation resources reaches the preset voltage threshold.

[0058] In this embodiment, the system can compare the real-time monitored photovoltaic voltage with a preset voltage threshold. If the photovoltaic voltage is within the preset range, it indicates that the current photovoltaic voltage meets the grid stability requirements, and the connection process can continue. If the photovoltaic voltage is lower than the preset threshold, subsequent steps are performed to adjust the voltage to meet the voltage stability conditions.

[0059] It should be noted that the preset voltage threshold can be determined based on the transmission voltage of the distribution network. The transmission voltage of the distribution network can be a fixed value or a range value.

[0060] Step S203: If the photovoltaic voltage does not reach the preset voltage threshold, adjust the photovoltaic voltage so that the adjusted photovoltaic voltage reaches the preset voltage threshold. The preset voltage threshold is determined based on the transmission voltage of the distribution network.

[0061] As mentioned above, the preset voltage threshold can be a fixed value or a range value. If the preset voltage threshold is a fixed value, and the photovoltaic voltage is lower or higher than the fixed value, it is considered that the photovoltaic voltage has not reached the preset voltage threshold. Alternatively, if the preset voltage threshold is a range value, and the photovoltaic voltage is within the range, it is considered that the photovoltaic voltage has reached the preset voltage threshold; otherwise, it is considered that the photovoltaic voltage has not reached the preset voltage threshold.

[0062] In one embodiment, the process of adjusting the photovoltaic voltage can be carried out in the following manner: when the photovoltaic voltage is lower than a preset voltage threshold, the photovoltaic voltage is compensated to bring the photovoltaic voltage to the preset voltage threshold; when the photovoltaic voltage is higher than the preset voltage threshold, the photovoltaic voltage is stepped down to bring the photovoltaic voltage to the preset voltage threshold.

[0063] For example, when the photovoltaic voltage is lower than a preset voltage threshold, the specific voltage difference between the photovoltaic voltage and the preset voltage threshold can be calculated, and this voltage difference can be used to compensate the current photovoltaic voltage so that the photovoltaic voltage reaches the preset voltage threshold. In this way, when connecting thermal power, hydropower, and photovoltaic module power generation to the grid, unstable photovoltaic module voltages can be handled. When the connected photovoltaic voltage is high, it can be stepped down; when the photovoltaic voltage is low, it can be compensated, thereby ensuring that the photovoltaic voltage connected to the distribution network remains balanced with the distribution network voltage, reducing the pressure on the distribution network.

[0064] For example, a lower photovoltaic voltage can be boosted to the required voltage level using a boost converter. The output voltage can be controlled by adjusting the duty cycle of the boost converter switches. Alternatively, the voltage can be regulated by the inverter, such as by adjusting inverter parameters (e.g., pulse width modulation), thereby increasing the output voltage. The inverter can automatically adjust its operating state to achieve voltage compensation by monitoring the input and output voltages in real time. In some embodiments, voltage compensation and bucking can also be performed in other ways, such as optimizing the output power of the photovoltaic system through maximum power point tracking while simultaneously regulating the voltage. The bucking process for photovoltaic voltage is similar and will not be elaborated further.

[0065] Regarding the inverter regulation method mentioned above, since photovoltaic power systems are usually equipped with inverters, the system can send voltage compensation / step-down processing signals to the photovoltaic power system. After the photovoltaic power system processes the photovoltaic voltage, it delivers a voltage that meets the voltage conditions to the distribution network.

[0066] As can be seen, the embodiments of this application can effectively solve the voltage stability problem of photovoltaic power by monitoring and regulating the voltage of photovoltaic power generation resources when they are connected to the distribution network. Furthermore, through the aforementioned voltage compensation or step-down processing, dynamic regulation of the photovoltaic voltage is achieved, ensuring that the connected photovoltaic voltage meets the requirements of the distribution network and further improving the stability of photovoltaic resource connection.

[0067] Figure 3 This is a flowchart illustrating another method for accessing distribution network resources provided in this application embodiment. Based on the above embodiment, this embodiment takes into account the carrying capacity of the distribution network itself. In order to further improve the stability of distribution network resource access, this embodiment may include steps S301 and S302 in addition to the above steps S201-S203.

[0068] Step S301: Determine the total power generation capacity corresponding to the currently connected distribution network resources.

[0069] In this embodiment, the total power generation corresponding to the distribution network resources can be the sum of the electricity generated by all currently connected distribution network resources. For example, the currently connected distribution network resources include photovoltaic power generation, thermal power generation, and hydropower generation, and the total power generation is the sum of photovoltaic power generation, thermal power generation, and hydropower generation.

[0070] Because thermal and hydropower generation is more stable than photovoltaic (PV) power generation, monitoring equipment configured for thermal and hydropower systems can output relatively accurate power output figures for each. However, the power output of PV resources depends on the environment and requires comprehensive calculations to improve the accuracy of PV power output figures.

[0071] Specifically, the power generation capacity of photovoltaic power generation resources can be calculated as follows: based on the latitude and longitude information of the photovoltaic modules corresponding to the photovoltaic power generation resources and the solar altitude angle, the light intensity of the photovoltaic modules is determined, and based on the light intensity and illumination time of the photovoltaic modules, the power generation capacity of the photovoltaic power generation resources is determined.

[0072] For example, the solar irradiance for the day is calculated. Based on the latitude of the photovoltaic module and the solar altitude angle for the day, the solar irradiance for the day is calculated. The formula for calculating the solar irradiance for the location is as follows:

[0073] E=112000×cos(θ)×sin(φ)×sin(δ)+68400;

[0074] Where E represents natural illuminance in lux; θ represents solar altitude angle, ranging from 0 to 90°, which refers to the sun's position in the sky. When the solar altitude angle is 0°, the sun is above the horizon, and the illuminance is strongest; when the solar altitude angle is 90°, the sun is directly overhead, and the illuminance is weakest; φ represents geographical latitude, ranging from -90° to 90°; and δ represents solar declination, ranging from -23.45° to 23.45°.

[0075] Next, the power generation of the photovoltaic modules is calculated based on the number of modules. Without considering the conversion efficiency of the photovoltaic panels, the basic formula for calculating photovoltaic power generation is I: I = S * E * T; where S represents the area of ​​the photovoltaic modules, and T represents the sunshine duration (extracted from the local weather bureau database). In other words, S * E represents the photovoltaic power generation.

[0076] Step S302: When the total power generation reaches the maximum carrying capacity of the distribution network, an abnormal prompt message is issued. The abnormal prompt message is used to indicate the suspension of access to photovoltaic power generation resources.

[0077] The power grid carrying capacity, also known as the maximum carrying capacity of the distribution network, is the maximum amount of electricity that it can safely transmit. It is related to the physical infrastructure of the distribution network (such as transformers, lines, and switching equipment). If the total power generation exceeds the maximum carrying capacity of the distribution network, it may lead to equipment overload, increase the risk of failure, and may even cause power outages or equipment damage.

[0078] In this embodiment, when the maximum carrying capacity is reached, an abnormality alert is issued as a warning to remind operators to take necessary measures, such as adjusting the power generation plan or activating backup schemes. For example, photovoltaic power generation can be suspended. Because photovoltaic power generation resources have high volatility and uncertainty, suspending photovoltaic resource access when the maximum carrying capacity is reached and prioritizing the use of more stable resources (such as thermal or hydropower) can effectively improve the reliability of the power grid.

[0079] In one implementation, considering the uncertainty of the maximum carrying capacity of the distribution network in different regions, this embodiment calculates the maximum carrying capacity in conjunction with local conditions, thereby improving the accuracy of the distribution network's carrying capacity. Specifically, the calculation method for the maximum carrying capacity of the distribution network can be as follows: determine the current-carrying constraints of the distribution network based on the rated voltage and continuous allowable current of the lines; calculate the maximum carrying capacity of the distribution network based on the current-carrying constraints, the active power and reactive power of the loads in the distribution network.

[0080] This paper considers that the grid's charge-carrying capacity varies across different regions due to factors such as economic development, grid installation time, equipment power, and equipment maintenance frequency. Using existing capacity data or empirical values ​​could easily lead to significant discrepancies with the actual capacity of the distribution network. This embodiment combines the current-carrying constraints and power of the distribution network to calculate the actual grid capacity in real time, which is more consistent with the actual situation of the distribution network and allows for more flexible installation of different numbers of photovoltaic panels in subsequent steps.

[0081] For example, the formula for calculating the maximum carrying capacity of a distribution network can be:

[0082]

[0083] In the formula, U represents the maximum carrying capacity of the distribution network under current-carrying constraints, i.e., the maximum power carrying capacity; n Indicates the rated voltage of the line; I lim Indicates the continuous allowable current value of the line; Q l P represents the active power of the load; l This indicates the reactive power of the load.

[0084] Among them, the continuous allowable current value I of the line lim This is the maximum current that the line can withstand during long-term operation; exceeding this value may cause the line to overheat or be damaged; the active power Q of the load. l This is the actual power consumed, used for work or heat generation. It represents the load's actual power demand on the power grid. The load's reactive power P l This is the power used to maintain the electric and magnetic fields; it does not perform actual work, but it plays an important role in the stability of the power grid and voltage regulation. In the formula... Partial calculations were performed to determine the maximum carrying capacity of the distribution network without considering reactive power, by subtracting... The impact of the load's active power on the grid's carrying capacity was considered, and P was added. l This is used to adjust the impact of reactive power, making the calculation results closer to the actual situation.

[0085] As can be seen, the above calculation method, by combining the voltage and current of the distribution network with the active and reactive power of the load, provides a more accurate estimation method for the maximum carrying capacity of the distribution network. This calculation method can reflect the actual carrying capacity of the distribution network in real time.

[0086] Figure 4This is a flowchart illustrating another method for accessing distribution network resources provided in this application embodiment. Based on the above embodiment, when the total power generation does not reach the maximum carrying capacity of the distribution network, the effective carrying capacity of the photovoltaic power generation resources is calculated to achieve effective adjustment of the photovoltaic power generation resources, which can further improve the stability of the distribution network. Specifically, in addition to steps S201-S203, S301, and S302, the method provided in this embodiment also includes steps S401-S403.

[0087] Step S401: When the total power generation does not reach the maximum carrying capacity of the distribution network, determine the effective carrying capacity of the photovoltaic power generation resources based on the other distribution network resources currently connected to the distribution network besides the photovoltaic power generation resources.

[0088] In this embodiment, the main consideration is the scenario where the current distribution network has no photovoltaic power generation resources connected to it. By subtracting the total power of other distribution network resources from the maximum carrying capacity, the remaining carrying capacity of the distribution network can be obtained. This remaining carrying capacity is then used to connect photovoltaic resources, which is the effective carrying capacity of the photovoltaic power generation resources.

[0089] Step S402: Determine the power supply of photovoltaic power generation resources based on the effective carrying capacity and the preset photovoltaic power generation time.

[0090] Specifically, the power supply capacity of photovoltaic power generation resources can be calculated by multiplying the effective carrying capacity and the photovoltaic power generation time. The photovoltaic power generation time refers to the daily effective power generation time of the photovoltaic power generation system.

[0091] Step S403: Determine the number of photovoltaic power generation panels based on the power supply of the photovoltaic power generation resources and the power generation of each photovoltaic power generation panel in the photovoltaic power generation resources. The number of photovoltaic power generation panels is used to regulate the access of photovoltaic power generation resources.

[0092] Specifically, the required number of photovoltaic (PV) panels can be calculated by dividing the electricity supplied by the power generated by each PV panel. The distribution network resource access system can then send this calculated number of PV panels to the PV power generation system for adjustment of PV power resources, such as increasing or decreasing the number of PV panels (e.g., enabling or disabling some PV panels).

[0093] In some embodiments, when the system connects to photovoltaic power generation resources, it can determine the weather of the day: initially determine whether it is a cloudy or rainy day; if it is initially determined to be a sunny day, the photovoltaic modules work normally and generate voltage, calculate the power generation of the photovoltaic modules, and calculate the instantaneous voltage of the photovoltaic power generation. If the instantaneous voltage reaches a preset instantaneous voltage threshold (which can be the same as or different from the preset voltage threshold mentioned above), it can determine whether the photovoltaic power generation resources can be input into the grid. If not, an abnormal prompt is issued.

[0094] Furthermore, when it is determined to be a cloudy or rainy day, it can be further determined whether the voltage generated by the photovoltaic module on a cloudy or rainy day reaches the inverter's operating threshold. If the voltage generated by the photovoltaic module on a cloudy or rainy day cannot reach the inverter's operating threshold, the photovoltaic module will not work. If the voltage generated by the photovoltaic module on a cloudy or rainy day can reach the inverter's operating threshold, the photovoltaic module can continue to work.

[0095] In some embodiments, the method may further include the following steps: obtaining voltage fluctuation information of the distribution network based on the access data of the distribution network resources, wherein the voltage fluctuation information includes voltage fluctuation values; and determining a voltage regulation strategy for regulating the photovoltaic voltage based on the voltage fluctuation information.

[0096] In this embodiment, access data of distribution network resources can be collected in real time using sensors and monitoring equipment to obtain voltage data of photovoltaic power generation resources in the distribution network, such as instantaneous voltage values ​​and trends. Then, using this voltage data, voltage fluctuation values ​​are calculated, i.e., the degree to which the voltage deviates from its rated value. Fluctuations can be expressed as percentages or absolute values, and are typically quantified through statistical analysis (such as standard deviation and maximum deviation).

[0097] Next, based on voltage fluctuation information, a voltage regulation strategy is formulated or adjusted. This could involve adjusting the inverter's operating parameters or using dynamic voltage regulation devices (such as voltage regulators or static var compensators). Specifically, the inverter's reactive power output can be adjusted to support voltage stability. Alternatively, a feedback control mechanism can be implemented to dynamically adjust the regulation strategy based on real-time voltage data, ensuring the voltage remains within the set range.

[0098] In some embodiments, an optimization model can be established by combining access data of distribution network resources. Specifically, simulations can be performed when photovoltaic modules are generating electricity. By establishing an optimization model, photovoltaic power supply capacity prediction data (i.e., effective load-bearing capacity) and photovoltaic voltage stability data (i.e., whether the photovoltaic voltage reaches the preset voltage threshold) can be input into the model. The real-time state of the distribution network can be estimated using state estimation methods, and the control strategy can be adjusted based on voltage fluctuations to reduce regulation costs.

[0099] Figure 5 This is a schematic diagram of the structure of a distribution network resource access device provided in an embodiment of this application, as shown below. Figure 5 As shown, it includes a response module 501, a judgment module 502, and an adjustment module 503, wherein,

[0100] The response module 501 is used to respond to the access of distribution network resources, which include at least one of photovoltaic power generation resources, thermal power generation resources and hydropower generation resources;

[0101] The judgment module 502 is used to determine whether the photovoltaic voltage of the photovoltaic power generation resource reaches a preset voltage threshold when the photovoltaic power generation resource is connected.

[0102] The adjustment module 503 is used to adjust the photovoltaic voltage if the photovoltaic voltage does not reach the preset voltage threshold, so that the adjusted photovoltaic voltage reaches the preset voltage threshold. The preset voltage threshold is determined based on the transmission voltage of the distribution network.

[0103] In one embodiment, the adjustment module 503 is specifically used to compensate the photovoltaic voltage when the photovoltaic voltage is lower than a preset voltage threshold so that the photovoltaic voltage reaches the preset voltage threshold; and to reduce the photovoltaic voltage when the photovoltaic voltage is higher than the preset voltage threshold so that the photovoltaic voltage reaches the preset voltage threshold.

[0104] In one embodiment, the apparatus further includes:

[0105] The first determining module is used to determine the total power generation capacity corresponding to the distribution network resources based on the currently connected distribution network resources.

[0106] The alert module is used to issue an abnormal alert message when the total power generation reaches the maximum carrying capacity of the distribution network. The abnormal alert message is used to indicate the suspension of access to photovoltaic power generation resources.

[0107] In one embodiment, the calculation method for the maximum carrying capacity of the distribution network includes: determining the current carrying capacity of the distribution network based on the rated voltage of the lines and the continuous allowable current value of the lines; and calculating the maximum carrying capacity of the distribution network based on the current carrying capacity of the distribution network, the active power of the loads of the distribution network, and their reactive power.

[0108] In one embodiment, the apparatus further includes:

[0109] The second determining module is used to determine the effective carrying capacity of photovoltaic power generation resources based on the other distribution network resources currently connected to the distribution network, excluding photovoltaic power generation resources, when the total power generation capacity has not reached the maximum carrying capacity of the distribution network.

[0110] The third determining module is used to determine the power supply of photovoltaic power generation resources based on the effective carrying capacity and the preset photovoltaic power generation time.

[0111] The fourth determining module is used to determine the number of photovoltaic power generation panels based on the power supply of the photovoltaic power generation resources and the power generation of each photovoltaic power generation panel in the photovoltaic power generation resources. The number of photovoltaic power generation panels is used to regulate the access of photovoltaic power generation resources.

[0112] In one embodiment, the total power generation includes the power generation of photovoltaic power generation resources. The calculation method for the power generation of photovoltaic power generation resources includes: determining the irradiance of the photovoltaic modules based on the latitude and longitude information of the photovoltaic modules corresponding to the photovoltaic power generation resources and the solar altitude angle; and determining the power generation of the photovoltaic power generation resources based on the irradiance of the photovoltaic modules and the irradiance time.

[0113] In one embodiment, the apparatus further includes: an acquisition module, configured to acquire voltage fluctuation information of the distribution network based on the access data of the distribution network resources, the voltage fluctuation information including voltage fluctuation values; and a strategy adjustment module, configured to determine a voltage regulation strategy for regulating the photovoltaic voltage based on the voltage fluctuation information.

[0114] The apparatus provided in this embodiment can execute the method provided in the above method embodiment. Its implementation principle and technical effect are similar, and will not be described in detail here.

[0115] Based on the same technical concept, this application also provides a possible resource access system for a distribution network. The system may include a node data preprocessing module and a grid output module. The output of the node data preprocessing module is connected to a node data acquisition module. The output of the node data acquisition module is connected to a node data input module. The output of the node data input module is connected to a grid voltage threshold module. The output of the grid voltage threshold module is connected to a grid load analysis module. The output of the grid load analysis module is connected to a photovoltaic voltage regulation module. The output of the photovoltaic voltage regulation module is connected to the grid output module.

[0116] Preferably, the input terminal of the grid voltage threshold module is connected to a node abnormal data alert module. The data input to the node data input module includes calculations of thermal power generation, hydropower generation, and photovoltaic power generation. The node abnormal data alert module processes the data calculated from the three sources to determine whether there is an abnormality. It compares the power supply input to the grid with previous data. If the power supply exceeds the fluctuation range of previous data, an abnormality occurs, and an alert is issued when the data is abnormal.

[0117] Preferably, the grid voltage threshold module calculates the maximum threshold of the grid based on the current grid carrying capacity, and compares it with the thermal power generation capacity, hydropower generation capacity, and photovoltaic power generation capacity to determine whether the grid can carry the load. The load status of the grid is then assessed through the node abnormal data alert module.

[0118] Preferably, the photovoltaic power generation calculation involves calculating the solar irradiance for the day. Based on the latitude of the photovoltaic module and the solar altitude angle for that day, the solar irradiance is calculated. The formula for calculating the solar irradiance for the given area is as follows:

[0119] E=112000×cos(θ)×sin(φ)×sin(δ)+68400;

[0120] Where E represents natural illuminance in lux; θ represents solar altitude angle, ranging from 0 to 90°. Solar altitude angle (θ) refers to the position of the sun in the sky. When the solar altitude angle is 0°, the sun is above the horizon, and the illuminance is strongest; when the solar altitude angle is 90°, the sun is directly overhead, and the illuminance is weakest; φ represents geographical latitude, ranging from -90° to 90°; δ represents solar declination, ranging from -23.45° to 23.45°.

[0121] The power generation of photovoltaic modules is calculated based on the number of photovoltaic modules. Without considering the conversion efficiency of photovoltaic panels, the basic formula for calculating photovoltaic power generation is I: I = S * E * T.

[0122] Wherein, S represents the area of ​​the photovoltaic module, and T represents the sunshine duration (the sunshine duration is extracted from the local weather bureau database).

[0123] Preferably, the photovoltaic module judges the weather of the day when generating electricity; it initially judges whether it is a cloudy or rainy day. If it is initially judged to be a sunny day, the photovoltaic module works normally and generates voltage, calculates the power generation of the photovoltaic module, and the output terminal of the photovoltaic power generation calculation is connected to an instantaneous voltage threshold judgment module. The instantaneous voltage threshold judgment module is connected to the power grid, and the instantaneous voltage threshold judgment module determines whether the photovoltaic module can generate electricity and input it into the power grid.

[0124] Preferably, when it is determined to be a cloudy or rainy day, it is further determined whether the voltage generated by the photovoltaic module on a cloudy or rainy day reaches the inverter's operating threshold. If the voltage generated by the photovoltaic module on a cloudy or rainy day cannot reach the inverter's operating threshold, the photovoltaic module will not work. If the voltage generated by the photovoltaic module on a cloudy or rainy day can reach the inverter's operating threshold, the photovoltaic module will continue to work.

[0125] Preferably, the power grid carrying capacity

[0126] in, U represents the maximum carrying capacity of the distribution network under current-carrying constraints; n Indicates the rated voltage of the line; I lim Indicates the continuous allowable current value of the line; Q l P represents the active power of the load; l This indicates the reactive power of the load.

[0127] Preferably, the grid voltage threshold module judges the photovoltaic voltage to determine whether the voltage value generated by the photovoltaic module matches the grid transmission voltage. When the photovoltaic voltage matches the grid transmission voltage, the photovoltaic voltage regulation module compensates for the photovoltaic voltage. When the photovoltaic voltage is higher than the grid transmission voltage, the photovoltaic voltage regulation module reduces the photovoltaic voltage.

[0128] Preferably, the grid load analysis module predicts the photovoltaic power supply capacity and evaluates the stability of the photovoltaic voltage. At the same time, it establishes an optimization model, inputs the photovoltaic power supply capacity prediction data and the voltage stability data into the model, estimates the real-time state of the distribution network through the state estimation method, evaluates the node voltage stability, determines whether there is a risk of voltage exceeding the limit, and minimizes the reactive power regulation of the photovoltaic power generation system by controlling the current flow, thereby reducing regulation costs.

[0129] Preferably, after the optimization model of the photovoltaic voltage regulation module yields results, the active and reactive power output of the photovoltaic inverter is adjusted according to the optimization results. The distribution network voltage is monitored in real time, and the control strategy is adjusted based on voltage fluctuations. The power factor and voltage stability of the system are improved through a static reactive power compensator. When the grid current is high, the reactive power is reduced to reduce line and equipment losses. Through the above algorithm, voltage stability can be ensured when photovoltaics are connected to the distribution network. In practical applications, the algorithm can be adjusted and optimized according to the actual situation.

[0130] The system provided in this embodiment can execute the method provided in the above method embodiment. Its implementation principle and technical effect are similar, and will not be described in detail here.

[0131] Figure 6 This is a schematic diagram of the access equipment for the distribution network resources provided in this application. Figure 6 As shown, the power distribution network resource access device 60 provided in this embodiment includes at least one processor 601 and a memory 602. Optionally, the device 60 further includes a communication component 603. The processor 601, memory 602, and communication component 603 are connected via a bus.

[0132] In a specific implementation, at least one processor 601 executes computer execution instructions stored in memory 602, causing at least one processor 601 to perform the above-described method.

[0133] The specific implementation process of processor 601 can be found in the above method embodiments, and its implementation principle and technical effect are similar. It will not be repeated here.

[0134] In the above embodiments, it should be understood that the processor can be a Central Processing Unit (CPU), or other general-purpose processors, digital signal processors (DSPs), application-specific integrated circuits (ASICs), etc. The general-purpose processor can be a microprocessor or any conventional processor. The steps of the method disclosed in this invention can be directly implemented by a hardware processor, or implemented by a combination of hardware and software modules within the processor.

[0135] The memory may include random access memory (RAM) and may also include non-volatile memory (NVM), such as at least one disk storage device.

[0136] The bus can be an Industry Standard Architecture (ISA) bus, a Peripheral Component Interconnect (PCI) bus, or an Extended Industry Standard Architecture (EISA) bus, etc. Buses can be categorized as address buses, data buses, control buses, etc. For ease of illustration, the buses shown in the accompanying drawings are not limited to a single bus or a single type of bus.

[0137] This application also provides a computer program product, including a computer program that, when executed by a processor, implements the above-described method.

[0138] This application also provides a computer-readable storage medium storing computer-executable instructions, which, when executed by a processor, implement the above-described method.

[0139] The aforementioned readable storage medium can be implemented by any type of volatile or non-volatile storage device or a combination thereof, such as static random access memory (SRAM), electrically erasable programmable read-only memory (EEPROM), erasable programmable read-only memory (EPROM), programmable read-only memory (PROM), read-only memory (ROM), magnetic storage, flash memory, magnetic disk, or optical disk. The readable storage medium can be any available medium accessible to a general-purpose or special-purpose computer.

[0140] An exemplary readable storage medium is coupled to a processor, enabling the processor to read information from and write information to the readable storage medium. Of course, the readable storage medium can also be a component of the processor. The processor and the readable storage medium can reside in an Application Specific Integrated Circuit (ASIC). Alternatively, the processor and the readable storage medium can exist as discrete components in the device.

[0141] The division of units is merely a logical functional division; in actual implementation, there may be other division methods. For example, multiple units or components may be combined or integrated into another system, or some features may be ignored or not executed. Furthermore, the coupling or direct coupling or communication connection shown or discussed may be indirect coupling or communication connection through some interfaces, devices, or units, and may be electrical, mechanical, or other forms.

[0142] The units described as separate components may or may not be physically separate. The components shown as units may or may not be physical units; that is, they may be located in one place or distributed across multiple network units. Some or all of the units can be selected to achieve the purpose of this embodiment according to actual needs.

[0143] In addition, the functional units in the various embodiments of the present invention can be integrated into one processing unit, or each unit can exist physically separately, or two or more units can be integrated into one unit.

[0144] If a function is implemented as a software functional unit and sold or used as an independent product, it can be stored in a computer-readable storage medium. Based on this understanding, the technical solution of this invention, or the part that contributes to the prior art, or a part of the technical solution, can be embodied in the form of a software product. This computer software product is stored in a storage medium and includes several instructions to cause a computer device (which may be a personal computer, server, or network device, etc.) to execute all or part of the steps of the methods of the various embodiments of this invention. The aforementioned storage medium includes various media capable of storing program code, such as USB flash drives, portable hard drives, read-only memory (ROM), random access memory (RAM), magnetic disks, or optical disks.

[0145] Those skilled in the art will understand that all or part of the steps of the above-described method embodiments can be implemented by hardware related to program instructions. The aforementioned program can be stored in a computer-readable storage medium. When executed, the program performs the steps of the above-described method embodiments; and the aforementioned storage medium includes various media capable of storing program code, such as ROM, RAM, magnetic disks, or optical disks.

[0146] Finally, it should be noted that other embodiments of the invention will readily occur to those skilled in the art upon consideration of the specification and practice of the invention disclosed herein. This invention is intended to cover any variations, uses, or adaptations of the invention that follow the general principles of the invention and include common knowledge or customary techniques in the art not disclosed herein, and is not limited to the precise structures described above and shown in the accompanying drawings, and various modifications and changes can be made without departing from its scope. The scope of the invention is limited only by the appended claims.

Claims

1. A method for accessing distribution network resources, characterized in that, include: In response to the access of distribution network resources, the distribution network resources include at least one of photovoltaic power generation resources, thermal power generation resources and hydropower generation resources; When connecting to the photovoltaic power generation resource, determine whether the photovoltaic voltage of the photovoltaic power generation resource reaches a preset voltage threshold; If the photovoltaic voltage does not reach the preset voltage threshold, the photovoltaic voltage is adjusted so that the adjusted photovoltaic voltage reaches the preset voltage threshold, which is determined based on the transmission voltage of the distribution network.

2. The method according to claim 1, characterized in that, The adjustment of the photovoltaic voltage includes: When the photovoltaic voltage is lower than a preset voltage threshold, the photovoltaic voltage is compensated to bring the photovoltaic voltage up to the preset voltage threshold. When the photovoltaic voltage is higher than a preset voltage threshold, the photovoltaic voltage is stepped down to bring it down to the preset voltage threshold.

3. The method according to claim 1 or 2, characterized in that, Also includes: Based on the currently connected distribution network resources, determine the total power generation capacity corresponding to the distribution network resources; When the total power generation reaches the maximum carrying capacity of the distribution network, an abnormality warning message is issued, which is used to indicate the suspension of access to photovoltaic power generation resources.

4. The method according to claim 3, characterized in that, The calculation method for the maximum carrying capacity of the distribution network includes: The current-carrying constraints of the distribution network are determined based on the rated voltage and continuous allowable current of the lines. The maximum carrying capacity of the distribution network is calculated based on the current-carrying constraints of the distribution network, the active power of the load in the distribution network, and its reactive power.

5. The method according to claim 3, characterized in that, Also includes: When the total power generation does not reach the maximum carrying capacity of the distribution network, the effective carrying capacity of the photovoltaic power generation resources is determined based on the other distribution network resources currently connected to the distribution network, excluding photovoltaic power generation resources. The power supply of the photovoltaic power generation resources is determined based on the effective carrying capacity and the preset photovoltaic power generation time. The number of photovoltaic panels is determined based on the power supply of the photovoltaic power generation resource and the power generation of each photovoltaic panel in the photovoltaic power generation resource. The number of photovoltaic panels is used to regulate the access of the photovoltaic power generation resource.

6. The method according to claim 3, characterized in that, The total power generation includes the power generation of photovoltaic power generation resources, and the calculation method for the power generation of photovoltaic power generation resources includes: The light intensity of the photovoltaic module is determined based on the latitude and longitude information of the photovoltaic module corresponding to the photovoltaic power generation resource and the solar altitude angle. The power generation capacity of the photovoltaic power generation resource is determined based on the light intensity and illumination time of the photovoltaic module.

7. The method according to claim 1, characterized in that, Also includes: Based on the access data of the distribution network resources, obtain the voltage fluctuation information of the distribution network, wherein the voltage fluctuation information includes voltage fluctuation values; Based on the voltage fluctuation information, a voltage regulation strategy for adjusting the photovoltaic voltage is determined.

8. An access device for power distribution network resources, characterized in that, include: Includes: memory, processor; The memory stores computer-executed instructions; The processor executes computer execution instructions stored in the memory, causing the processor to perform the access method for distribution network resources as described in any one of claims 1-7.

9. A computer-readable storage medium, characterized in that, The computer-readable storage medium stores computer-executable instructions, which, when executed by a processor, are used to implement the access method for distribution network resources as described in any one of claims 1-7.

10. A computer program product, characterized in that, It includes a computer program that, when executed by a processor, implements the access method for distribution network resources as described in any one of claims 1-7.

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