A low voltage flexible AC / DC distribution system

Abstract

The present invention relates to the technical field of power supply and distribution, and discloses a low-voltage flexible AC / DC distribution system. By arranging a first-level low-voltage flexible AC / DC distribution device and a first-level energy storage device in each single power user corresponding to a target power consumption station area, and arranging a second-level low-voltage flexible AC / DC distribution device and a second-level energy storage device in the target power consumption station area, on the one hand, surplus power generation is stored in a hierarchical manner, and on the other hand, the required power supply is allocated in a hierarchical manner, thereby realizing hierarchical coordinated distribution control of power supply and storage in the entire target power consumption station area, so that insufficient power storage supply can be supplied in time without the help of municipal power, and at the same time, a large amount of surplus power storage can be consumed locally, which greatly optimizes the distribution function of the existing low-voltage flexible AC / DC distribution system, not only reduces the electricity cost, but also avoids the waste of electric energy, improves the power supply and storage distribution control effect of the entire target power consumption station area, and has high practical value.

Description

Technical Field

[0001] The invention relates to the technical field of power distribution, and in particular to a low-voltage flexible AC / DC distribution system. Background Art

[0002] With the continuous development of social economy, people's living standards have been rapidly improved. At the same time, the demand for electricity is also increasing sharply. At this time, if only the mains electricity is used for power supply, it will undoubtedly increase the power supply burden of the mains electricity, not only increasing the power supply cost, but also being easily affected by the mains power supply failure, resulting in the risk of power outage. In this case, taking a power user area as an example, in order to reduce the power supply cost and reduce the incidence of power outages, many electricity users began to use the advantages of their own building roofs to use photovoltaic power generation for self-supply.

[0003] In view of the fact that photovoltaic power generation is affected by lighting conditions and has the characteristic of instability, this characteristic easily leads to the phenomenon of inequality between photovoltaic power generation and power consumption. In this case, a low-voltage flexible AC / DC distribution system is needed, that is, by setting a low-voltage flexible AC / DC distribution system and energy storage equipment in each individual electricity user, when the photovoltaic power generation of a certain individual electricity user is greater than the power consumption, the surplus power generation is stored in the energy storage device; when the photovoltaic power generation of a certain individual electricity user is less than the power consumption, the energy storage device controls the discharge, thereby realizing the distribution control of supply and storage.

[0004] However, the low-voltage flexible AC / DC distribution systems currently used in power distribution areas are all one-to-one distribution control and lack overall control functions. Since the power consumption and storage conditions of each individual power user are different, it is very likely that some individual power users will have insufficient storage supply while some individual power users will have a large surplus of storage. When the storage supply is insufficient, the corresponding individual power users will need to rely on the city power, making it impossible to completely break away from the city power, which invisibly increases the power cost and is likely to cause power supply disorder to the city power. When there is a large surplus of storage, there is no other power load to consume it locally, which will cause waste of electricity.

[0005] From the above, it can be seen that the low-voltage flexible AC / DC distribution system currently used in the power consumption area makes the power supply-storage distribution control effect of the entire power consumption area poor and has low practical value. Summary of the invention

[0006] To solve the above technical problems, the present invention is implemented through the following technical solutions: a low-voltage flexible AC / DC distribution system, including a low-voltage flexible AC / DC distribution facility layout module, which is used to count the number of individual electricity users in the target power user area and number each individual electricity user, and then set a first-level low-voltage flexible AC / DC distribution device and a first-level energy storage device in each individual electricity user, wherein each first-level low-voltage flexible AC / DC distribution device is connected to the corresponding first-level energy storage device, and a second-level low-voltage flexible AC / DC distribution device and a second-level energy storage device connected thereto are set in the target power user area, and each first-level low-voltage flexible AC / DC distribution device is interactively connected with the second-level low-voltage flexible AC / DC distribution device.

[0007] The power generation and power consumption monitoring module for individual power users is used to set up a power generation monitoring terminal and a power consumption monitoring terminal in each individual power user, wherein the power generation monitoring terminal is used to collect the photovoltaic power generation parameters of each individual power user in each monitoring time period, and the power consumption monitoring terminal is used to collect the power consumption of each individual power user in each monitoring time period.

[0008] The electricity consumption information database is used to store the rated inverter efficiency and rated DC input voltage of the photovoltaic inverter corresponding to each individual electricity user, store the full-load storage capacity of the first-level energy storage device corresponding to each individual electricity user, and store the rated input voltage and full-load storage capacity of the second-level energy storage device.

[0009] The individual electricity user classification module is used to extract the photovoltaic power generation from the photovoltaic power generation parameters of each individual electricity user in each monitoring time period, so as to compare the photovoltaic power generation and power consumption of each individual electricity user in each monitoring time period. If the photovoltaic power generation of a certain individual electricity user in a certain monitoring time period is greater than the power consumption of the individual electricity user in the monitoring time period, the individual electricity user is classified as a surplus power generation user; if the photovoltaic power generation of a certain individual electricity user in a certain monitoring time period is less than the power consumption of the individual electricity user in the monitoring time period, the individual electricity user is classified as a power generation shortage user.

[0010] The surplus power generation hierarchical storage module for surplus power generation users is used to obtain the surplus power generation corresponding to the surplus power generation users and store the surplus power generation in a hierarchical manner.

[0011] The module for hierarchical allocation of power demand for users with power generation shortage is used to obtain the power demand corresponding to users with power generation shortage and to perform hierarchical allocation of the power demand.

[0012] Preferably, the power generation monitoring end includes a photovoltaic power meter and a voltage sensor, wherein the photovoltaic power meter is used to collect photovoltaic power generation, the voltage sensor is used to monitor the photovoltaic power generation output voltage, and the power consumption monitoring end is an energy meter for collecting power consumption.

[0013] Preferably, the photovoltaic power generation parameters include photovoltaic power generation and photovoltaic power generation output voltage.

[0014] Preferably, the surplus power generation corresponding to the surplus power generation users is specifically obtained by counting the number of surplus power generation users, and subtracting the power consumption from the photovoltaic power generation corresponding to each surplus power generation user to obtain the surplus power generation corresponding to each surplus power generation user.

[0015] Preferably, the specific operation process corresponding to the hierarchical storage of surplus power generation is as follows: S1. Based on the serial number of the surplus power generation user, the full-load storage capacity of the primary energy storage device corresponding to each surplus power generation user is extracted from the power consumption information database.

[0016] S2. Compare the surplus power generation corresponding to each surplus power generation user with the full-load storage capacity of the primary energy storage device corresponding to the surplus power generation user. If the surplus power generation corresponding to a surplus power generation user is less than or equal to the full-load storage capacity of the primary energy storage device corresponding to the surplus power generation user, start the primary low-voltage flexible AC / DC distribution device corresponding to the surplus power generation user to store the surplus power generation corresponding to the surplus power generation user in the primary energy storage device corresponding to the surplus power generation user; otherwise, record the surplus power generation user as an excess surplus power generation user, and execute S3-S7.

[0017] S3. Count the number of surplus power users and the excess power storage corresponding to each surplus power user.

[0018] S4. Extract the photovoltaic power generation output voltage from the photovoltaic power generation parameters corresponding to each excess power generation surplus user, and extract the rated input voltage of the secondary energy storage device from the electricity consumption information database, and then compare the photovoltaic power generation output voltage corresponding to each excess power generation surplus user with the rated input voltage of the secondary energy storage device, and calculate the energy storage conversion coefficient corresponding to each excess power generation surplus user , the calculation formula is , where j represents the number of the excess power generation user, , m represents the number of users with excess power generation, It is represented by the photovoltaic power generation output voltage corresponding to the jth excess power generation user, Expressed as the rated input voltage of the secondary energy storage device.

[0019] S5. The excess storage power and storage conversion coefficient corresponding to each excess power generation surplus user are calculated by the formula , calculate the storage priority corresponding to each excess power generation user , It is represented by the excess storage power corresponding to the j-th excess power generation surplus user.

[0020] S6. Sort the excess power generation users in descending order of power storage priority to obtain a sorting result of the excess power generation users.

[0021] S7. Extract the full-load storage capacity of the secondary energy storage device from the electricity consumption information database, and extract the excess storage capacity corresponding to each excess power generation user in turn based on the ranking results of the excess power generation users, and add them up, and then compare the accumulated result with the full-load storage capacity of the secondary energy storage device. When a certain accumulated result reaches the full-load storage capacity of the secondary energy storage device, stop accumulating, and then record the accumulated excess power generation user number as the storage allocation user, so that the secondary low-voltage flexible AC / DC distribution device controls the primary low-voltage flexible AC / DC distribution device corresponding to the storage allocation user, and the primary low-voltage flexible AC / DC distribution device stores the excess storage capacity corresponding to the storage allocation user in the secondary energy storage device.

[0022] Preferably, the specific statistical method for calculating the excess storage capacity corresponding to each excess power generation surplus user is to subtract the full load storage capacity of the primary energy storage device corresponding to each excess power generation surplus user from the surplus power generation corresponding to the excess power generation surplus user to obtain the excess storage capacity corresponding to each excess power generation surplus user.

[0023] Preferably, the specific method of obtaining the power demand corresponding to the power-scarce users is to count the number of power-scarce users, and subtract the photovoltaic power generation from the power consumption corresponding to each power-scarce user to obtain the power demand corresponding to each power-scarce user.

[0024] Preferably, the specific operation process corresponding to the hierarchical allocation of the demand power supply is as follows: (1) the first-level low-voltage flexible AC / DC distribution device corresponding to each power-scarce user retrieves the current storage capacity of the first-level energy storage device corresponding to the power-scarce user, and based on the number of the power-scarce user, extracts the rated inverter efficiency and rated DC input voltage of the photovoltaic inverter corresponding to each power-scarce user from the power consumption information database, and at the same time extracts the photovoltaic power generation output voltage corresponding to each power-scarce user from the photovoltaic power generation parameters.

[0025] (2) Based on the current storage capacity of the primary energy storage device corresponding to each power-deficient user, the photovoltaic power output voltage, the rated inverter efficiency of the photovoltaic inverter, and the rated DC input voltage of the photovoltaic inverter, the effective power supply of the primary energy storage device corresponding to each power-deficient user is estimated. .

[0026] (3) Compare the effective power supply of the primary energy storage device corresponding to each power-deficient user with the demand power supply corresponding to the power-deficient user. If the effective power supply of the primary energy storage device corresponding to a power-deficient user is greater than or equal to the demand power supply corresponding to the power-deficient user, the primary low-voltage flexible AC / DC distribution device corresponding to the power-deficient user controls the primary energy storage device to supply power to the power-deficient user. Otherwise, the power-deficient user is recorded as a power-deficient user with insufficient power, and corresponding operations are performed according to the hierarchical allocation process of the demand power supply corresponding to the power-deficient user with insufficient power.

[0027] Preferably, the process of hierarchical allocation of the demand power supply corresponding to the users with insufficient power generation is as follows: Step 1, counting the number of users with insufficient power generation and the amount of insufficient power storage corresponding to each user with insufficient power generation.

[0028] The second step is to locate the location of each power generation shortage user and the location of the secondary energy storage device respectively, thereby obtaining the distance between each power generation shortage user and the secondary energy storage device, which is recorded as the power supply distance.

[0029] Step 3: Import the insufficient storage power and power supply distance corresponding to each insufficient power generation user into the formula , calculate the power supply priority corresponding to each power generation shortage user , where i represents the number of the user who lacks power generation. , n represents the number of users who lack power generation, , They are respectively represented as the insufficient storage power and power supply distance corresponding to the i-th insufficient power generation user, , They are respectively represented as the trade-off factors corresponding to the set under-storage power and power supply distance, and e is represented as a natural constant.

[0030] The fourth step is to sort the users with insufficient power generation according to the power supply priority from large to small, and obtain the sorting result of the users with insufficient power generation.

[0031] Step 5: Calculate the allocated power supply corresponding to each power generation shortage user by combining the power storage shortage corresponding to the set unit power supply distance. , and its calculation formula is ,p represents the power loss corresponding to unit power supply distance.

[0032] The sixth step is to obtain the current storage capacity of the secondary energy storage device corresponding to the target power consumption area, and based on the ranking results of the power generation users with insufficient power generation, extract the allocated power supply corresponding to each power generation user in turn, and accumulate them, and then compare the accumulated result with the current storage capacity of the secondary energy storage device corresponding to the target power consumption area. When a certain accumulated result reaches the current storage capacity of the secondary energy storage device corresponding to the target power consumption area, the accumulation is stopped, and then the accumulated power generation users are recorded as power supply allocation users, so that the secondary low-voltage flexible AC / DC distribution device controls the secondary energy storage device to supply power to each power supply allocation user according to the allocated power supply corresponding to each power supply allocation user.

[0033] Preferably, the specific statistical method for the insufficient storage amount corresponding to each insufficient power generation user is to subtract the effective power supply from the demand power supply corresponding to each insufficient power generation user to obtain the insufficient storage amount corresponding to each insufficient power generation user.

[0034] Compared with the prior art, the present invention has the following advantages: 1. The present invention sets a first-level low-voltage flexible AC / DC distribution device and a first-level energy storage device in each individual electricity user corresponding to the target power consumption station area, and sets a second-level low-voltage flexible AC / DC distribution device and a second-level energy storage device in the target power consumption station area, so as to store the surplus power generation in a hierarchical manner on the one hand, and allocate the required power supply in a hierarchical manner on the other hand, thereby realizing the hierarchical coordinated distribution control of supply and storage of electricity in the entire target power consumption station area, so that the insufficient storage supply can be supplied in time without the help of city power, and at the same time, a large amount of surplus storage can be consumed locally, which greatly optimizes the distribution function of the existing low-voltage flexible AC / DC distribution system, reduces the dependence on city power to a certain extent, not only reduces the electricity cost, but also avoids the waste of electric energy, maximizes the supply-storage distribution control effect of the entire target power consumption station area, and has high practical value.

[0035] 2. When performing hierarchical storage of surplus power generation, the present invention identifies individual power users who need to coordinate power storage allocation by comparing the surplus power generation corresponding to the surplus power generation users with the full-load storage capacity of the first-level energy storage equipment, and comprehensively screens out power storage allocation users in the power storage allocation process based on the excess storage capacity and the power storage conversion coefficient. Compared with screening based solely on the excess storage capacity, this screening method is more scientific and reliable, and can maximize the energy storage utilization rate of the second-level energy storage equipment.

[0036] 3. When performing hierarchical allocation of demand power supply, the present invention identifies individual electricity users who need coordinated power supply allocation by comparing the effective power supply of the first-level energy storage device corresponding to the power generation-deficient user with the demand power supply corresponding to the power generation-deficient user, and comprehensively screens out power supply allocation users in the power supply allocation process based on the insufficient storage capacity and the power supply distance. Compared with screening based solely on insufficient storage capacity, this screening method enriches the screening dimensions of power supply allocation users, making the screening results more accurate and reliable, thereby enabling individual electricity users who need power supply to receive timely power supply. BRIEF DESCRIPTION OF THE DRAWINGS

[0037] The present invention is further described using the accompanying drawings, but the embodiments in the accompanying drawings do not constitute any limitation to the present invention. A person skilled in the art can obtain other drawings based on the following drawings without creative work.

[0038] Figure 1 It is a schematic diagram of system connection of the present invention. DETAILED DESCRIPTION

[0039] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0040] Reference Figure 1 As shown, a low-voltage flexible AC / DC distribution system includes a low-voltage flexible AC / DC distribution facility layout module, a single power user power generation and power consumption monitoring module, a power consumption information database, a single power user classification module, a surplus power generation hierarchical storage module for surplus power generation users, and a power supply demand hierarchical allocation module for power generation shortage users, wherein the single power user power generation and power consumption monitoring module is connected to the single power user classification module, the single power user classification module is respectively connected to the low-voltage flexible AC / DC distribution facility layout module, the power consumption information database, the surplus power generation hierarchical storage module for surplus power generation users, and the power supply demand hierarchical allocation module for power generation shortage users, and the single power user power generation and power consumption monitoring module is respectively connected to the surplus power generation hierarchical storage module for surplus power generation users and the power supply demand hierarchical allocation module for power generation shortage users.

[0041] The low-voltage flexible AC / DC distribution facility layout module is used to count the number of individual electricity users in the target power consumption area and to number each individual electricity user, and then to set a first-level low-voltage flexible AC / DC distribution device and a first-level energy storage device in each individual electricity user, wherein each first-level low-voltage flexible AC / DC distribution device is connected to the corresponding first-level energy storage device, and a second-level low-voltage flexible AC / DC distribution device and a second-level energy storage device connected thereto are set in the target power consumption area, and each first-level low-voltage flexible AC / DC distribution device is interconnected with the second-level low-voltage flexible AC / DC distribution device.

[0042] Exemplarily, the target power consumption area mentioned above can be a residential area, an industrial park, an office park, etc. When the target power consumption area is a residential area, the corresponding individual power users are each residential building; when the target power consumption area is an industrial park, the corresponding individual power users are each enterprise factory building; when the target power consumption area is an office park, the corresponding individual power users are each office building.

[0043] The present invention sets a first-level low-voltage flexible AC / DC distribution device and a first-level energy storage device in each single electricity user corresponding to the target power consumption station area, and sets a second-level low-voltage flexible AC / DC distribution device and a second-level energy storage device in the target power consumption station area, so as to store the surplus power generation in a hierarchical manner on the one hand, and allocate the required power supply in a hierarchical manner on the other hand, thereby realizing the hierarchical coordinated distribution control of power supply and storage in the entire target power consumption station area, so that the insufficient power storage supply can be supplied in time without the help of the city power, and at the same time, a large amount of surplus power storage can be consumed on the spot, which greatly optimizes the distribution function of the existing low-voltage flexible AC / DC distribution system, reduces the dependence on the city power to a certain extent, not only reduces the electricity cost, but also avoids the waste of electric energy, maximizes the supply-storage distribution control effect of the entire target power consumption station area, and has high practical value.

[0044] The single-unit electricity user power generation and power consumption monitoring module is used to set a power generation monitoring terminal and a power consumption monitoring terminal in each single electricity user, wherein the power generation monitoring terminal is used to collect the photovoltaic power generation parameters of each single electricity user in each monitoring time period, and the photovoltaic power generation parameters include photovoltaic power generation and photovoltaic power generation output voltage, and the power consumption monitoring terminal is used to collect the power consumption of each single electricity user in each monitoring time period.

[0045] In a specific embodiment of the present invention, the power generation monitoring end includes a photovoltaic power meter and a voltage sensor, wherein the photovoltaic power meter is used to collect photovoltaic power generation, the voltage sensor is arranged at the photovoltaic output end, and is used to monitor the photovoltaic power generation output voltage, and the power consumption monitoring end is an energy meter, wherein the power consumption monitoring end is arranged on the main power supply circuit, and is used to collect power consumption.

[0046] The electricity consumption information database is used to store the rated inverter efficiency and rated DC input voltage of the photovoltaic inverter corresponding to each individual electricity user, store the full load storage capacity of the first-level energy storage device corresponding to each individual electricity user, and store the rated input voltage and full load storage capacity of the second-level energy storage device.

[0047] The individual electricity user classification module is used to extract the photovoltaic power generation from the photovoltaic power generation parameters of each individual electricity user in each monitoring time period, so as to compare the photovoltaic power generation and power consumption of each individual electricity user in each monitoring time period. If the photovoltaic power generation of a certain individual electricity user in a certain monitoring time period is greater than the power consumption of the individual electricity user in the monitoring time period, the individual electricity user is classified as a surplus power generation user; if the photovoltaic power generation of a certain individual electricity user in a certain monitoring time period is less than the power consumption of the individual electricity user in the monitoring time period, the individual electricity user is classified as a power generation scarce user.

[0048] The surplus power generation hierarchical storage module for surplus power generation users is used to obtain the surplus power generation corresponding to the surplus power generation users. The specific acquisition method is to count the number of surplus power generation users, and subtract the power consumption from the photovoltaic power generation corresponding to each surplus power generation user to obtain the surplus power generation corresponding to each surplus power generation user. At the same time, the surplus power generation is hierarchically stored. The specific operation process is as follows: S1. Based on the number of the surplus power generation user, the full load storage capacity of the first-level energy storage equipment corresponding to each surplus power generation user is extracted from the power consumption information database.

[0049] S2. Compare the surplus power generation corresponding to each surplus power generation user with the full-load storage capacity of the primary energy storage device corresponding to the surplus power generation user. If the surplus power generation corresponding to a surplus power generation user is less than or equal to the full-load storage capacity of the primary energy storage device corresponding to the surplus power generation user, start the primary low-voltage flexible AC / DC distribution device corresponding to the surplus power generation user to store the surplus power generation corresponding to the surplus power generation user in the primary energy storage device corresponding to the surplus power generation user; otherwise, record the surplus power generation user as an excess surplus power generation user, and execute S3-S7.

[0050] S3. Count the number of users with excess power generation and the excess storage capacity corresponding to each user with excess power generation. The specific statistical method is to subtract the full load storage capacity of the primary energy storage device corresponding to each user with excess power generation from the surplus power generation corresponding to the user with excess power generation, so as to obtain the excess storage capacity corresponding to each user with excess power generation.

[0051] S4. Extract the photovoltaic power generation output voltage from the photovoltaic power generation parameters corresponding to each excess power generation surplus user, and extract the rated input voltage of the secondary energy storage device from the electricity consumption information database, and then compare the photovoltaic power generation output voltage corresponding to each excess power generation surplus user with the rated input voltage of the secondary energy storage device, and calculate the energy storage conversion coefficient corresponding to each excess power generation surplus user , the calculation formula is , where j represents the number of the excess power generation user, , m represents the number of users with excess power generation, It is represented by the photovoltaic power generation output voltage corresponding to the jth excess power generation user, Expressed as the rated input voltage of the secondary energy storage device.

[0052] It should be noted that the calculation of the energy storage conversion coefficient in the present invention takes into account the inconsistency between the photovoltaic power generation output voltage of each individual electricity user and the rated input voltage of the secondary energy storage device. In this case, there will be a problem of conversion efficiency. Only when the photovoltaic power generation output voltage is closer to the rated input voltage of the secondary energy storage device, the conversion efficiency is higher. The conversion efficiency also reflects the ease of electricity storage to a certain extent, thereby reducing the storage time.

[0053] S5. The excess storage power and storage conversion coefficient corresponding to each excess power generation surplus user are calculated by the formula , calculate the storage priority corresponding to each excess power generation user , It is represented by the excess storage power corresponding to the j-th excess power generation surplus user.

[0054] S6. Sort the excess power generation users in descending order of power storage priority to obtain a sorting result of the excess power generation users.

[0055] S7. Extract the full-load storage capacity of the secondary energy storage device from the electricity consumption information database, and extract the excess storage capacity corresponding to each excess power generation user in turn based on the ranking results of the excess power generation users, and add them up, and then compare the accumulated result with the full-load storage capacity of the secondary energy storage device. When a certain accumulated result reaches the full-load storage capacity of the secondary energy storage device, stop accumulating, and then record the accumulated excess power generation user number as the storage allocation user, so that the secondary low-voltage flexible AC / DC distribution device controls the primary low-voltage flexible AC / DC distribution device corresponding to the storage allocation user, and the primary low-voltage flexible AC / DC distribution device stores the excess storage capacity corresponding to the storage allocation user in the secondary energy storage device.

[0056] When performing hierarchical storage of surplus power generation, the present invention identifies individual power users who need to coordinate power storage allocation by comparing the surplus power generation corresponding to the surplus power generation users with the full-load storage capacity of the first-level energy storage equipment, and comprehensively screens out power storage allocation users in the power storage allocation process based on the excess storage capacity and the power storage conversion coefficient. Compared with screening based solely on the excess storage capacity, this screening method is more scientific and reliable, and can maximize the energy storage utilization rate of the second-level energy storage equipment.

[0057] The module for hierarchical allocation of power demand for power generation users with insufficient power generation is used to obtain the power demand corresponding to the power generation users with insufficient power generation. The specific statistical method is to count the number of power generation users with insufficient power generation, and subtract the photovoltaic power generation from the power consumption corresponding to each power generation user to obtain the power demand corresponding to each power generation user with insufficient power generation. At the same time, hierarchical allocation of the power demand is performed. The specific operation process is as follows: (1) The first-level low-voltage flexible AC / DC distribution device corresponding to each power generation user retrieves the current storage capacity of the first-level energy storage device corresponding to the power generation user, and extracts the rated inverter efficiency and rated DC input voltage of the photovoltaic inverter corresponding to each power generation user from the power consumption information database based on the number of the power generation user. At the same time, the photovoltaic power generation output voltage corresponding to each power generation user is extracted from the photovoltaic power generation parameters.

[0058] (2) Based on the current storage capacity of the primary energy storage device corresponding to each power-deficient user, the photovoltaic power output voltage, the rated inverter efficiency of the photovoltaic inverter, and the rated DC input voltage of the photovoltaic inverter, the effective power supply of the primary energy storage device corresponding to each power-deficient user is estimated. .

[0059] It should be explained that the above calculation of the effective power supply of the primary energy storage device takes into account that the main body of photovoltaic power generation is direct current, so that the primary energy storage device also stores direct current, while the electricity required by the user is alternating current. In this case, the electric energy stored in the primary energy storage device needs to be converted into alternating current through a photovoltaic inverter to achieve the purpose of power supply. Due to the inverter efficiency, the electric energy stored in the primary energy storage device cannot be fully used. Therefore, the current storage capacity of the primary energy storage device cannot be directly used for calculation. It needs to be converted into effective power supply to facilitate subsequent calculations. In the process of calculating the effective power supply of the primary energy storage device, the closer the photovoltaic power generation output voltage is to the rated DC input voltage of the photovoltaic inverter, the higher the inverter efficiency, which makes the converted effective power supply greater.

[0060] (3) Compare the effective power supply of the primary energy storage device corresponding to each power-deficient user with the demand power supply corresponding to the power-deficient user. If the effective power supply of the primary energy storage device corresponding to a power-deficient user is greater than or equal to the demand power supply corresponding to the power-deficient user, the primary low-voltage flexible AC / DC distribution device corresponding to the power-deficient user controls the primary energy storage device to supply power to the power-deficient user. Otherwise, the power-deficient user is recorded as a power-deficient user with insufficient power, and the corresponding operation is performed according to the hierarchical allocation process of the demand power supply corresponding to the power-deficient user with insufficient power. The specific operation process is as follows: Step 1, count the number of power-deficient users with insufficient power and the insufficient storage amount corresponding to each power-deficient user. The specific counting method is to subtract the effective power supply from the demand power supply corresponding to each power-deficient user to obtain the insufficient storage amount corresponding to each power-deficient user.

[0061] The second step is to locate the location of each power generation shortage user and the location of the secondary energy storage device respectively, thereby obtaining the distance between each power generation shortage user and the secondary energy storage device, which is recorded as the power supply distance.

[0062] Step 3: Import the insufficient storage power and power supply distance corresponding to each insufficient power generation user into the formula , calculate the power supply priority corresponding to each power generation shortage user , where i represents the number of the user who lacks power generation. , n represents the number of users who lack power generation, , They are respectively represented as the insufficient storage power and power supply distance corresponding to the i-th insufficient power generation user, , They are respectively represented as the trade-off factors corresponding to the set under-storage power and power supply distance, and e is represented as a natural constant. The under-storage power has a positive impact on the power supply priority, while the power supply distance has a negative impact on the power supply priority.

[0063] The fourth step is to sort the users with insufficient power generation according to the power supply priority from large to small, and obtain the sorting result of the users with insufficient power generation.

[0064] Step 5: Calculate the allocated power supply corresponding to each power generation shortage user by combining the power storage shortage corresponding to the set unit power supply distance. , and its calculation formula is ,p represents the power loss corresponding to unit power supply distance.

[0065] The sixth step is to obtain the current storage capacity of the secondary energy storage device corresponding to the target power consumption area, and based on the ranking results of the power generation users with insufficient power generation, extract the allocated power supply corresponding to each power generation user in turn, and accumulate them, and then compare the accumulated result with the current storage capacity of the secondary energy storage device corresponding to the target power consumption area. When a certain accumulated result reaches the current storage capacity of the secondary energy storage device corresponding to the target power consumption area, the accumulation is stopped, and then the accumulated power generation users are recorded as power supply allocation users, so that the secondary low-voltage flexible AC / DC distribution device controls the secondary energy storage device to supply power to each power supply allocation user according to the allocated power supply corresponding to each power supply allocation user.

[0066] When performing hierarchical allocation of demand power supply, the present invention identifies individual power users who need coordinated power supply allocation by comparing the effective power supply of the first-level energy storage device corresponding to the power generation-deficient user with the demand power supply corresponding to the power generation-deficient user, and comprehensively screens out power supply allocation users in combination with the insufficient storage capacity and the power supply distance during the power supply allocation process. Compared with screening based solely on the insufficient storage capacity, this screening method enriches the screening dimensions of power supply allocation users, making the screening results more accurate and reliable, thereby enabling individual power users who need power supply to obtain timely power supply.

[0067] The above contents are merely examples and explanations of the structure of the present invention. The technicians in this technical field may make various modifications or additions to the specific embodiments described or replace them in a similar manner. As long as they do not deviate from the structure of the invention or exceed the scope defined by the claims, they should all fall within the protection scope of the present invention.

Claims

1. A low voltage flexible AC / DC distribution system, characterized in that: include: A low-voltage flexible AC / DC distribution facility layout module is used to count the number of individual electricity users in the target power-using station area and number each individual electricity user, and then set a first-level low-voltage flexible AC / DC distribution device and a first-level energy storage device in each individual electricity user, wherein each first-level low-voltage flexible AC / DC distribution device is connected to the corresponding first-level energy storage device, and a second-level low-voltage flexible AC / DC distribution device and a second-level energy storage device connected thereto are set in the target power-using station area, and each first-level low-voltage flexible AC / DC distribution device is interconnected with the second-level low-voltage flexible AC / DC distribution device; The power generation and power consumption monitoring module of a single power user is used to set a power generation monitoring terminal and a power consumption monitoring terminal in each single power user, wherein the power generation monitoring terminal is used to collect the photovoltaic power generation parameters of each single power user in each monitoring time period, and the power consumption monitoring terminal is used to collect the power consumption of each single power user in each monitoring time period; The electricity consumption information database is used to store the rated inverter efficiency and rated DC input voltage of the photovoltaic inverter corresponding to each individual electricity user, store the full-load storage capacity of the primary energy storage device corresponding to each individual electricity user, and store the rated input voltage and full-load storage capacity of the secondary energy storage device; The single electricity user classification module is used to extract the photovoltaic power generation from the photovoltaic power generation parameters of each single electricity user in each monitoring time period, so as to compare the photovoltaic power generation and power consumption of each single electricity user in each monitoring time period. If the photovoltaic power generation of a single electricity user in a monitoring time period is greater than the power consumption of the single electricity user in the monitoring time period, the single electricity user is classified as a surplus power generation user; if the photovoltaic power generation of a single electricity user in a monitoring time period is less than the power consumption of the single electricity user in the monitoring time period, the single electricity user is classified as a power generation shortage user; A surplus power generation hierarchical storage module for surplus power generation users, used to obtain the surplus power generation corresponding to the surplus power generation users and store the surplus power generation in a hierarchical manner; The module for hierarchical allocation of power supply demand for power generation-deficient users is used to obtain the power supply demand corresponding to power generation-deficient users and to perform hierarchical allocation of the power supply demand; The specific operation process corresponding to the hierarchical storage of surplus power generation is as follows: S1. Extracting the full-load storage capacity of the primary energy storage device corresponding to each surplus power generation user from the power consumption information database based on the number of the surplus power generation user; S2, compare the surplus power generation corresponding to each surplus power generation user with the full-load storage capacity of the primary energy storage device corresponding to the surplus power generation user. If the surplus power generation corresponding to a surplus power generation user is less than or equal to the full-load storage capacity of the primary energy storage device corresponding to the surplus power generation user, start the primary low-voltage flexible AC / DC distribution device corresponding to the surplus power generation user to store the surplus power generation corresponding to the surplus power generation user in the primary energy storage device corresponding to the surplus power generation user; otherwise, record the surplus power generation user as an excess surplus power generation user, and execute S3-S7; S3, counting the number of surplus power users and the excess storage power corresponding to each surplus power user; The specific statistical method for the excess storage amount corresponding to each excess power generation surplus user is to obtain the excess storage amount corresponding to each excess power generation surplus user by subtracting the full load storage amount of the primary energy storage device corresponding to the excess power generation surplus user from the excess power generation corresponding to the excess power generation surplus user; S4. Extract the photovoltaic power generation output voltage from the photovoltaic power generation parameters corresponding to each excess power generation surplus user, and extract the rated input voltage of the secondary energy storage device from the electricity consumption information database, and then compare the photovoltaic power generation output voltage corresponding to each excess power generation surplus user with the rated input voltage of the secondary energy storage device, and calculate the energy storage conversion coefficient corresponding to each excess power generation surplus user , the calculation formula is , where j represents the number of the excess power generation user, , m represents the number of users with excess power generation, It is represented by the photovoltaic power generation output voltage corresponding to the jth excess power generation user, It is expressed as the rated input voltage of the secondary energy storage device; S5. The excess storage power and storage conversion coefficient corresponding to each excess power generation surplus user are calculated by the formula , calculate the storage priority corresponding to each excess power generation user , It is represented by the excess storage power corresponding to the jth excess power generation surplus user; S6. Sort the excess power generation users in descending order of power storage priority to obtain a sorting result of the excess power generation users; S7. Extract the full-load storage capacity of the secondary energy storage device from the electricity consumption information database, and extract the excess storage capacity corresponding to each excess power generation user in turn based on the ranking results of the excess power generation users, and add them up, and then compare the accumulated result with the full-load storage capacity of the secondary energy storage device. When a certain accumulated result reaches the full-load storage capacity of the secondary energy storage device, stop accumulating, and then record the accumulated excess power generation user number as the storage allocation user, so that the secondary low-voltage flexible AC / DC distribution device controls the primary low-voltage flexible AC / DC distribution device corresponding to the storage allocation user, and the primary low-voltage flexible AC / DC distribution device stores the excess storage capacity corresponding to the storage allocation user in the secondary energy storage device.

2. A low voltage flexible AC / DC distribution system according to claim 1, characterized in that: The power generation monitoring end includes a photovoltaic power meter and a voltage sensor, wherein the photovoltaic power meter is used to collect photovoltaic power generation, the voltage sensor is used to monitor the photovoltaic power generation output voltage, and the power consumption monitoring end is an energy meter for collecting power consumption.

3. A low voltage flexible AC / DC distribution system according to claim 2, characterized in that: The photovoltaic power generation parameters include photovoltaic power generation and photovoltaic power generation output voltage.

4. A low voltage flexible AC / DC distribution system according to claim 1, characterized in that: The surplus power generation corresponding to the surplus power generation users is specifically obtained by counting the number of surplus power generation users, and subtracting the power consumption from the photovoltaic power generation corresponding to each surplus power generation user to obtain the surplus power generation corresponding to each surplus power generation user.

5. A low voltage flexible AC / DC distribution system according to claim 1, characterized in that: The specific method for obtaining the power demand corresponding to the power generation-deficient users is to count the number of power generation-deficient users, and subtract the photovoltaic power generation from the power consumption corresponding to each power generation-deficient user to obtain the power demand corresponding to each power generation-deficient user.

6. A low voltage flexible AC / DC distribution system according to claim 3, characterized in that: The specific operation process corresponding to the hierarchical allocation of demand power supply is as follows: (1) The first-level low-voltage flexible AC / DC distribution device corresponding to each power-scarce user retrieves the current storage capacity of the first-level energy storage device corresponding to the power-scarce user, and extracts the rated inverter efficiency and rated DC input voltage of the photovoltaic inverter corresponding to each power-scarce user from the power consumption information database based on the number of the power-scarce user. At the same time, the photovoltaic power generation output voltage corresponding to each power-scarce user is extracted from the photovoltaic power generation parameters; (2) Based on the current storage capacity of the primary energy storage device corresponding to each power-deficient user, the photovoltaic power output voltage, the rated inverter efficiency of the photovoltaic inverter, and the rated DC input voltage of the photovoltaic inverter, the effective power supply of the primary energy storage device corresponding to each power-deficient user is estimated. ; (3) Compare the effective power supply of the primary energy storage device corresponding to each power-deficient user with the demand power supply corresponding to the power-deficient user. If the effective power supply of the primary energy storage device corresponding to a power-deficient user is greater than or equal to the demand power supply corresponding to the power-deficient user, the primary low-voltage flexible AC / DC distribution device corresponding to the power-deficient user controls the primary energy storage device to supply power to the power-deficient user. Otherwise, the power-deficient user is recorded as a power-deficient user with insufficient power, and corresponding operations are performed according to the hierarchical allocation process of the demand power supply corresponding to the power-deficient user with insufficient power.

7. A low voltage flexible AC / DC distribution system according to claim 6, characterized in that: The process of hierarchical allocation of power demand corresponding to users with insufficient power generation is as follows: The first step is to count the number of users with insufficient power generation and the corresponding insufficient storage power of each user with insufficient power generation; Step 2: locate the location of each power generation shortage user and the location of the secondary energy storage device respectively, thereby obtaining the distance between each power generation shortage user and the secondary energy storage device, which is recorded as the power supply distance; Step 3: Import the insufficient storage power and power supply distance corresponding to each insufficient power generation user into the formula , calculate the power supply priority corresponding to each power generation shortage user , where i represents the number of the user who lacks power generation. , n represents the number of users who lack power generation, , They are respectively represented by the insufficient storage power and power supply distance corresponding to the i-th insufficient power generation user, e is represented by a natural constant, , They are respectively represented as the trade-off factors corresponding to the set under-storage power and power supply distance; Step 4: sort the users with insufficient power generation according to the power supply priority from large to small, and obtain the sorting result of the users with insufficient power generation; Step 5: Calculate the allocated power supply corresponding to each power generation shortage user by combining the power storage shortage corresponding to the set unit power supply distance. , and its calculation formula is ,p represents the power loss corresponding to the unit power supply distance; The sixth step is to obtain the current storage capacity of the secondary energy storage device corresponding to the target power consumption area, and based on the ranking results of the power generation users with insufficient power generation, extract the allocated power supply corresponding to each power generation user in turn, and accumulate them, and then compare the accumulated result with the current storage capacity of the secondary energy storage device corresponding to the target power consumption area. When a certain accumulated result reaches the current storage capacity of the secondary energy storage device corresponding to the target power consumption area, the accumulation is stopped, and then the accumulated power generation users are recorded as power supply allocation users, so that the secondary low-voltage flexible AC / DC distribution device controls the secondary energy storage device to supply power to each power supply allocation user according to the allocated power supply corresponding to each power supply allocation user.

8. A low voltage flexible AC / DC distribution system according to claim 7, characterized in that: The specific statistical method for the insufficient storage amount corresponding to each insufficient power generation user is to subtract the effective power supply from the demand power supply corresponding to each insufficient power generation user to obtain the insufficient storage amount corresponding to each insufficient power generation user.

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