A bidirectional energy storage power inverter

Abstract

The present invention relates to the technical field of power grid energy storage, and discloses a bidirectional energy storage power inverter, which includes a first power grid and a second power grid. The bidirectional energy storage power inverter obtains an electricity load prediction model through a first electricity load prediction module and a second electricity load prediction module, adjusts the on / off of a multi-way switch module relative to the first grid-connected inverter and the second grid-connected inverter, and the on / off of multiple DC / DC converters with different numbers relative to the first grid-connected inverter and the second grid-connected inverter, controls the same battery pack to be allocated to the first grid-connected inverter to perform peak shaving on the first power grid or allocated to the second grid-connected inverter to perform peak shaving on the second power grid, realizes peak shaving of multiple power grids with the same battery supplying different voltages and / or different frequencies, and can adjust different numbers of battery packs for peak shaving according to the electricity load prediction model, so as to realize the efficient comprehensive utilization of the same battery pack for charging or discharging or disconnecting and standby in different power grids.

Description

Technical Field

[0001] The present invention relates to the technical field of power grid energy storage, and particularly to a bidirectional energy storage power inverter. Background Art

[0002] In a power system, the power grid is used to connect power generation equipment and power-consuming facilities. The daily load characteristics of the power grid in different regions are divided into three stages: peak period, flat period, and valley period. The intensity and occurrence time of the peak and valley are uncertain, and the power supply capacity of the power grid is limited. To ensure the operation stability and safety of the power system, peak shaving is required during the peak and valley periods of power supply. Energy storage devices can store the excess electric energy during the peak period in energy storage devices such as batteries, supercapacitors, flywheel energy storage, and compressed air energy storage, and release the electric energy during the valley period to meet the power supply load requirements of power grids in different regions.

[0003] For example, a hybrid energy storage system and control method for a microgrid based on flywheel energy storage with the Chinese patent publication number CN111404199B has basic power grid peak shaving and energy storage functions. However, since its battery is only used for single power grid peak shaving and cannot realize the application of multiple power grids with different voltages and / or different frequencies supplied by the same battery. In addition, due to the constraints of the voltage and capacity of single cells, in order to meet the requirements of high voltage and large capacity of electrical equipment and energy storage systems, batteries are usually used in series, parallel, or series-parallel hybrid ways. As the use time and number of cycles increase, the capacity attenuation and aging degree of each single cell are different, and in severe cases, it will cause overcharging or over-discharging of some batteries, easily leading to safety accidents and damage to the power system. Therefore, a bidirectional energy storage power inverter is proposed to solve the above technical problems. Summary of the Invention

[0004] (I) Technical Problems to be Solved

[0005] In view of the deficiencies of the prior art, the present invention provides a bidirectional energy storage power inverter, which has the advantages of using the same battery to supply multiple power grid peak shaving applications with different voltages and / or different frequencies to reduce the operation cost of the power grid, being able to adaptively adjust different numbers of batteries for peak shaving according to the power supply demand, and detecting and controlling the on-off of the real-time charge and discharge performance of a single battery to improve the operation stability and safety of the power grid system, etc. It solves the problems of, for example, a hybrid energy storage system and control method based on flywheel energy storage with the Chinese patent publication number CN111404199B, which has basic power grid peak shaving and energy storage functions, but since its battery is only used for single power grid peak shaving and cannot realize the application of multiple power grids with the same battery supplying different voltages and / or different frequencies. In addition, due to the constraints of the voltage and capacity of single cells, in order to meet the requirements of high voltage and large capacity of electrical equipment and energy storage systems, batteries are usually used in series, parallel or series-parallel hybrid ways. As the use time and the number of cycles increase, the capacity attenuation and aging degree of each single cell are different, and seriously, it may lead to overcharging or over-discharging of some batteries, which is likely to cause safety accidents and damage to the power system, etc.

[0006] (2) Technical solutions

[0007] To achieve the above object, the present invention provides the following technical solutions: A bidirectional energy storage power inverter includes a first power grid and a second power grid, as well as a first power consumption load prediction module and a second power consumption load prediction module for detecting the peak and valley periods of power consumption of the first power grid and the second power grid. The first power grid is electrically connected to a first transformer, the first transformer is electrically connected to a first grid-connected inverter, the first grid-connected inverter is electrically connected to a multi-way switch module, the multi-way switch module is electrically connected to a plurality of DC / DC converters, each DC / DC converter is respectively electrically connected to a battery pack, the multi-way switch module is electrically connected to a multi-way programmable controller, the multi-way programmable controller is electrically connected to the first power consumption load prediction module and the second power consumption load prediction module, the multi-way programmable controller is electrically connected to a first detection unit and a network alarm device. The first detection unit is used to detect the charge and discharge performance of each battery pack. When and only when the real-time charge and discharge performance of a single battery pack is detected to exceed the preset interval value, the multi-way programmable controller controls the port of the multi-way switch module corresponding to the connection of the single battery pack to be disconnected in time and the network alarm device gives an early warning. The multi-way switch module is electrically connected to a second grid-connected inverter, the second grid-connected inverter is electrically connected to a second transformer, and the second transformer is electrically connected to the second power grid. The multi-way programmable controller is used to control the on-off of the multi-way switch module according to the first power consumption load prediction module and / or the second power consumption load prediction module, and then control the priority charge and discharge of different battery packs corresponding to the peak and valley periods of power consumption of the first power grid or the second power grid.

[0008] Preferably, the multi-way switch module includes an S1 switch group, an S2 switch group, an S3 switch group, a main line, and a first secondary line. The input end of the S1 switch group is electrically connected to the first grid-connected inverter, and the output end of the S1 switch group is electrically connected to the input ends of the S2 switch groups through multiple main lines respectively. The output ends of the S2 switch groups are electrically connected to each DC / DC converter respectively. A first secondary line is electrically connected to each main line, and the first secondary line is electrically connected to the input end of the S3 switch group. The output end of the S3 switch group is electrically connected to the second power grid.

[0009] Preferably, the multi-way switch module further includes an S4 switch group and a second secondary line. The second secondary line is electrically connected to each main line, and the second secondary line is electrically connected to the output end of the S4 switch group. The input end of the S4 switch group is electrically connected to a new energy power generation device.

[0010] Preferably, the new energy power generation device includes a photovoltaic inverter and a solar photovoltaic panel. The photovoltaic inverter is electrically connected to the input end of the S4 switch group, and the photovoltaic inverter is electrically connected to the solar photovoltaic panel.

[0011] Preferably, the new energy power generation device further includes a wind power inverter and a wind turbine. The wind power inverter is electrically connected to the input end of the S4 switch group, and the wind turbine is electrically connected to the wind power inverter.

[0012] Preferably, the new energy power generation device further includes a hydroelectric inverter and a hydroelectric generator. The hydroelectric inverter is electrically connected to the input end of the S4 switch group, and the hydroelectric generator is electrically connected to the hydroelectric inverter.

[0013] Preferably, it further includes a second detection unit electrically connected to the multi-way programmable controller. The second detection unit is used to detect the power generation of the solar photovoltaic panel, the wind turbine, and the hydroelectric generator, and transmit the detected values to the multi-way programmable controller. The multi-way programmable controller controls the on / off of the multi-way switch module according to the power generation of the solar photovoltaic panel, the wind turbine, and the hydroelectric generator, as well as the first power load prediction module and the second power load prediction module, and then controls the priority charging and discharging of different battery packs corresponding to the peak and valley periods of the first power grid and the second power grid to achieve the distribution of clean energy.

[0014] Preferably, the multi-way programmable controller includes a storage module, an operation module, a control module, and a communication module.

[0015] Preferably, the communication module is communicatively connected to the cloud platform.

[0016] Preferably, the first detection unit includes two or more combinations of a current sensor, a voltage sensor, a temperature sensor, and a timer.

[0017] (III) Beneficial effects

[0018] Compared with the prior art, the present invention provides a bidirectional energy storage power inverter, which has the following beneficial effects:

[0019] 1. For this bidirectional energy storage power inverter, the first power consumption load prediction module and the second power consumption load prediction module are used to obtain the power consumption load prediction models of the first power grid and the second power grid. Then, the multi-channel programmable controller adjusts the on / off of the multi-channel switch module relative to the first grid-connected inverter and the second grid-connected inverter, as well as the on / off of different numbers of multiple DC / DC converters relative to the first grid-connected inverter and the second grid-connected inverter according to the power consumption load prediction models of the first power grid and the second power grid. Furthermore, it can control the same battery pack to be allocated to the first grid-connected inverter to perform peak shaving on the first power grid or to the second grid-connected inverter to perform peak shaving on the second power grid, realizing the peak shaving application of multiple power grids with the same battery supplying different voltages and / or different frequencies, so as to reduce the operation cost of the power grid, and avoid the situation that the first power grid and the second power grid require a larger number of large-capacity batteries to supply the energy storage power grid operation due to different supply voltages and / or different frequencies, resulting in high power grid operation costs. At the same time, the multi-channel programmable controller can adjust different numbers of battery packs for peak shaving according to the power consumption load prediction models of the first power grid and the second power grid, so as to realize the efficient comprehensive utilization of the same battery pack for charging or discharging or disconnecting and standby in different power grids;

[0020] 2. For this bidirectional energy storage power inverter, the first detection unit detects the real-time charge and discharge performance of a single battery pack. When and only when the real-time charge and discharge performance of a single battery pack exceeds the preset interval value, the multi-channel programmable controller controls the port of the multi-channel switch module corresponding to the single battery pack to be disconnected in time and the network alarm device to give an early warning, so as to facilitate the power grid operation and maintenance personnel to ensure the normal operation of the power system. And multiple DC / DC converters are used to match the numbers of multiple battery packs to perform peak shaving on the first power grid and / or the second power grid, so that this energy storage power inverter can be used in combination with different models and specifications of battery packs, meeting the applications of different models and specifications of battery packs in the market. Furthermore, the maintenance convenience of this energy storage power inverter is improved, and the situation that the power grid operation and maintenance personnel have a large labor intensity and low work efficiency due to the large number of battery packs is avoided. Moreover, it ensures the long-term, continuous and stable operation and convenient maintenance of the power system, and avoids the situation that the overall peak shaving performance of this energy storage power inverter is affected or a large area is burned out due to the damage of a single battery pack, resulting in large cost losses or power outages. Relatively speaking, the operation stability and safety of this power system are further improved;

[0021] 3. The bidirectional energy storage power inverter can preliminarily calculate the number of battery packs required for a single peak shaving through a multi-channel programmable controller according to the power consumption load prediction models of the first power consumption load prediction module and / or the second power consumption load prediction module, and then further accurately control the on / off of the multi-channel switch module according to the real-time stored power of different battery packs, thereby further improving the priority charging and discharging of different battery packs of the energy storage power inverter during the peak and valley periods of the first power grid or the second power grid, further effectively extending the service life of a single battery pack, avoiding safety accidents and power system damage caused by overcharging or over-discharging of some battery packs, or high maintenance costs of the power system due to the short service life of the battery pack, achieving the peak shaving application of multiple power grids with the same battery supplying different voltages and / or different frequencies to reduce the operation cost of the power grid, and being able to adaptively adjust different numbers of batteries for peak shaving according to the power supply demand, while detecting and controlling the on / off of the real-time charging and discharging performance of a single battery to improve the operation stability and safety of the power grid system. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 FIG. is a schematic structural diagram of a bidirectional energy storage power inverter proposed by the present invention;

[0023] Figure 2 FIG. is a schematic structural diagram of the multi-channel programmable controller in the present invention;

[0024] Figure 3 FIG. is a schematic structural diagram of the first detection unit in the present invention. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0025] The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without creative efforts shall fall within the protection scope of the present invention.

[0026] Please refer to Figures 1-3, A bidirectional energy storage power inverter, comprising a first power grid 1 and a second power grid 2, as well as a first power load prediction module 3 and a second power load prediction module 4 for detecting the peak and valley periods of power consumption of the first power grid 1 and the second power grid 2. The first power grid 1 is electrically connected to a first transformer 5, the first transformer 5 is electrically connected to a first grid-connected inverter 6, the first grid-connected inverter 6 is electrically connected to a multi-way switch module 7, the multi-way switch module 7 is electrically connected to a plurality of DC / DC converters 8, each DC / DC converter 8 is respectively electrically connected to a battery pack 9, the multi-way switch module 7 is electrically connected to a multi-way programmable controller 10, the multi-way programmable controller 10 is electrically connected to the first power load prediction module 3 and the second power load prediction module 4, the multi-way programmable controller 10 is electrically connected to a first detection unit 11 and a networked alarm device 12. The first detection unit 11 is used to detect the charge and discharge performance of each battery pack 9. When and only when the real-time charge and discharge performance of a single battery pack 9 exceeds the preset interval value, the multi-way programmable controller 10 controls the corresponding port of the multi-way switch module 7 connected to the single battery pack 9 to be disconnected in time and the networked alarm device 12 gives an early warning. The multi-way switch module 7 is electrically connected to a second grid-connected inverter 13, the second grid-connected inverter 13 is electrically connected to a second transformer 14, and the second transformer 14 is electrically connected to the second power grid 2. The multi-way programmable controller 10 is used to regulate the on / off of the multi-way switch module 7 according to the first power load prediction module 3 and / or the second power load prediction module 4, and then control the priority charge and discharge of different battery packs 9 corresponding to the peak and valley periods of power consumption of the first power grid 1 or the second power grid 2. First, the first power load prediction module 3 and the second power load prediction module 4 analyze the historical power consumption data of the first power grid 1 and the second power grid 2, fully excavate the characteristics of the power load in the historical data, extract the characteristic values of the historical data, then construct characteristic training samples based on the characteristic values, train the neural network model through the characteristic training samples to obtain the power load prediction models of the first power grid 1 and the second power grid 2 (i.e., the peak and valley periods of power consumption of the first power grid 1 and the peak and valley periods of power consumption of the second power grid 2), and then the multi-way programmable controller 10 adjusts the on / off of the multi-way switch module 7 relative to the first grid-connected inverter 6 and the second grid-connected inverter 13, as well as the on / off of different numbers of a plurality of DC / DC converters 8 relative to the first grid-connected inverter 6 and the second grid-connected inverter 13 according to the power load prediction models of the first power grid 1 and the second power grid 2. Furthermore, it can control the same battery pack 9 to be allocated to the first grid-connected inverter 6 to perform peak shaving for the first power grid 1 or allocated to the second grid-connected inverter 13 to perform peak shaving for the second power grid 2, realizing the peak shaving application of multiple power grids with the same battery supplying different voltages and / or different frequencies to reduce the power grid operation cost, and avoiding the situation that the first power grid 1 and the second power grid 2 require a larger number of large-capacity batteries to supply the energy storage power grid operation due to different voltages and / or different frequencies of power supply, resulting in high power grid operation costs.Meanwhile, the multi-channel programmable controller 10 can adjust different numbers of battery packs 9 for peak shaving according to the power consumption load prediction models of the first power grid 1 and the second power grid 2, so as to realize the efficient comprehensive utilization of the same battery pack 9 for charging, discharging or disconnecting and standby in different power grids. At the same time, the first detection unit 11 detects the real-time charge and discharge performance of a single battery pack 9. When and only when the real-time charge and discharge performance of a single battery pack 9 exceeds the preset interval value, the multi-channel programmable controller 10 controls the timely disconnection of the port of the multi-channel switch module 7 corresponding to the single battery pack 9 and the networking alarm device 12 issues a warning, so as to facilitate the grid operation and maintenance personnel to ensure the normal operation of the power system. In this embodiment, multiple DC / DC converters 8 are used in conjunction with multiple battery packs 9 and perform peak shaving on the first power grid 1 and / or the second power grid 2, so that the energy storage power inverter can be used in conjunction with battery packs 9 of different model specifications, meeting the applications of battery packs 9 of different model specifications in the market, and further improving the maintenance convenience of the energy storage power inverter. The multiple DC / DC converters 8 are respectively numbered as: DC / DC converter 1, DC / DC converter 2... DC / DC converter n. The multiple battery packs 9 corresponding to the DC / DC converter 1, DC / DC converter 2... DC / DC converter n are numbered as: battery pack 1, battery pack 2... battery pack n. And the multiple first detection units 11 corresponding to the battery pack 1, battery pack 2... battery pack n are numbered as detection unit one 1, detection unit one 2... detection unit one n, so that during the warning process of the networking alarm device 12, the grid operation and maintenance personnel can be accurately reminded of the numbers and positions of the single or multiple battery packs 9 that do not meet the real-time charge and discharge performance indicators for accurate repair and maintenance, avoiding situations such as high labor intensity and low work efficiency of the grid operation and maintenance personnel due to the large number of battery packs 9. Furthermore, it ensures the long-term, continuous and stable operation and convenient maintenance of the power system, and avoids situations such as affecting the overall peak shaving performance of the energy storage power inverter or large-area burnout causing large cost losses or power outages due to the damage of a single battery pack 9. Relatively speaking, it further improves the operation stability and safety of the power system. In addition, the multi-channel programmable controller 10 can initially calculate the number of battery packs 9 required for a single peak shaving according to the power consumption load prediction models of the first power consumption load prediction module 3 and / or the second power consumption load prediction module 4, and then further accurately control the on-off of the multi-channel switch module 7 according to the real-time stored electricity of different battery packs 9, so as to further improve the priority charge and discharge of different battery packs 9 of the energy storage power inverter corresponding to the peak and valley time periods of the first power grid 1 or the second power grid 2. For example, when the power of a single battery pack 9 is lower than the preset value A1, the multi-channel programmable controller 10 controls the multi-channel switch module 7 to give priority to charging in cooperation with the first power grid 1 or the second power grid 2,When the power of a single battery pack 9 is higher than the preset value A2, where A1 < A2, the multi-channel programmable controller 10 controls the multi-channel switch module 7 to give priority to discharging in cooperation with the first power grid 1 or the second power grid 2. When a single battery pack 9 is fully charged and neither the first power grid 1 nor the second power grid 2 requires power supply, the multi-channel switch module 7 corresponding to the single battery pack 9 is controlled to disconnect. Relatively speaking, this further effectively extends the service life of the single battery pack 9, avoiding situations such as some battery packs 9 being prone to safety accidents and damage to the power system due to overcharging or over-discharging, or high maintenance costs of the power system caused by the short service life of the battery packs 9. It achieves the effect of peak shaving application for multi-channel power grids with the same battery supplying different voltages and / or different frequencies to reduce the operation cost of the power grid, and can adaptively adjust different numbers of batteries for peak shaving according to the power supply demand. At the same time, it detects and controls the on / off of the real-time charge and discharge performance of a single battery to improve the operation stability and safety of the power grid system.

[0027] Further, the multi-way switch module 7 includes an S1 switch group 71, an S2 switch group 72, an S3 switch group 73, a main line 74, and a first sub-line 75. The incoming line end of the S1 switch group 71 is electrically connected to the first grid-connected inverter 6. The outgoing line end of the S1 switch group 71 is electrically connected to the incoming line ends of the S2 switch group 72 through multiple main lines 74. The outgoing line end of the S1 switch group 71 includes multiple connection terminals such as S11, S12... S1n. The outgoing line ends of the S2 switch group 72 are respectively electrically connected to each DC / DC converter 8. The outgoing line end of the S2 switch group 72 includes multiple connection terminals such as S21, S22... S2n. And the multiple connection terminals such as S21, S22... S2n are respectively electrically connected to the DC / DC converter 1, the DC / DC converter 2... the DC / DC converter n. Each main line 74 is electrically connected with a first sub-line 75. The first sub-line 75 is electrically connected to the incoming line end of the S3 switch group 73. The incoming line end of the S3 switch group 73 includes multiple connection terminals such as S31, S32... S3n. And S31, S32... S3n are respectively and separately electrically connected to a first sub-line 75. The outgoing line end of the S3 switch group 73 is electrically connected to the second power grid 2; ① By disconnecting S31, S32... S3n of the S3 switch group 73 on the multi-way switch module 7 and selectively closing S11, S12... S1n on the S1 switch group 71 and S21, S22... S2n on the S2 switch group 72, thereby controlling the corresponding DC / DC converters of the battery packs 9 with different numbers and real-time stored electric quantities to access the first power grid 1, so as to realize single peak shaving for the peak-valley time periods of the first power grid 1; ② By disconnecting S11, S12... S1n of the S1 switch group 71 on the multi-way switch module 7 and selectively closing S21, S22... S2n on the S2 switch group 72 and S31, S32... S3n on the S3 switch group 73, thereby controlling the corresponding DC / DC converters of the battery packs 9 with different numbers and real-time stored electric quantities to access the second power grid 2, so as to realize single peak shaving for the peak-valley time periods of the second power grid 2; ③ By selectively closing S11, S12... S1n on the S1 switch group 71, S21, S22... S2n on the S2 switch group 72, and S31, S32... on the S3 switch group 73 of the multi-way switch module 7...S3n, and then control the battery packs 9 with different quantities and real-time stored power to access the first power grid 1 or the second power grid 2 corresponding to the DC / DC converters, so as to simultaneously perform peak shaving on the peak and valley time periods of the first power grid 1 and the second power grid 2. Furthermore, according to different electricity loads, adjust the battery packs 9 through the multi-way switch module 7 to cooperate with the power supply modes of the first power grid 1 and the second power grid 2, realize the optimization of power resource allocation and the reasonable scheduling of the power supply chain, improve the supply regulation of electric energy during peak hours and valley hours, meet the user needs and improve the power supply quality of the power grid.

[0028] Further, the multi-way switch module 7 further includes an S4 switch group 76 and a second secondary circuit 77. Each main circuit 74 is electrically connected to the second secondary circuit 77 respectively. Each second secondary circuit 77 is electrically connected to the output terminals of the S4 switch group 76 respectively. The output terminals of the S4 switch group 76 include multiple connection terminals such as S41, S42... S4n. The input terminal of the S4 switch group 76 is electrically connected to the new energy power generation device 15; ④ The multi-way programmable controller 10 controls the S1 switch group 71 and the S3 switch group 73 to disconnect, and controls the selective closing of S21, S22... S2n on the S4 switch group and the S2 switch group 72 of the multi-way switch module 7, so as to control the new energy power generation device 15 to generate electricity and store energy for specific single or multiple battery packs 9, and thus realize the peak shaving and matching application for the first power grid 1 and the second power grid 2 with different voltages and / or different frequencies; ⑤ The multi-way programmable controller 10 controls the S1 switch group 71 to disconnect, and controls the selective closing of S21, S22... S2n on the S2 switch group 72, S31, S32... S3n on the S3 switch group 73, and S41, S42... S4n on the S4 switch group 76, so as to control the new energy power generation device 15 to generate electricity and store energy for specific single or multiple battery packs 9 while delivering the excess electricity to the second power grid 2, playing a role in peak shaving and valley filling and improving the power supply quality of the power grid; ⑥ The multi-way programmable controller 10 controls the S3 switch group 73 to disconnect, and controls the selective closing of S11, S12... S1n on the S1 switch group 71, S21, S22... S2n on the S2 switch group 72, and S41, S42... S4n on the S4 switch group 76, so as to control the new energy power generation device 15 to generate electricity and store energy for specific single or multiple battery packs 9 while delivering the excess electricity to the first power grid 1, playing a role in peak shaving and valley filling and improving the power supply quality of the power grid; ⑦ The multi-way programmable controller 10 controls the selective closing of S11, S12... S1n on the S1 switch group 71, S21, S22... S2n on the S2 switch group 72, S31, S32... S3n on the S3 switch group 73, and S41, S42... S4n on the S4 switch group 76, so as to control the new energy power generation device 15 to generate electricity and store energy for specific single or multiple battery packs 9 while delivering the excess electricity to the first power grid 1 and the second power grid 2, playing a role in peak shaving and valley filling and improving the power supply quality of the power grid; ⑧ The multi-way programmable controller 10 controls the S2 switch group 72 to disconnect and the S4 switch group 76 to close, and selectively controls S11, S12... S1n on the S1 switch group 71, S31, S32... on the S3 switch group 73S3n is closed, thereby enabling the new energy power generation device 15 to supply power only to the first power grid 1 and / or the second power grid 2, so as to further increase the power supply management method of this bidirectional energy storage power inverter, and further comprehensively and uniformly regulate the power supply demands of the first power grid 1 and / or the second power grid 2 according to the power consumption prediction models of the first power grid 1 and the second power grid 2, the usage conditions and real-time stored power of different battery packs 9, and the new energy power generation device 15, so as to optimize the power resource allocation and reasonably dispatch the power supply chain, improve the supply regulation of electric energy during peak hours and valley hours, meet user demands and improve the power supply quality of the power grid.

[0029] Furthermore, the new energy power generation device 15 includes a photovoltaic inverter 1511 and a solar photovoltaic panel 1512. The photovoltaic inverter 1511 is electrically connected to the incoming line end of the S4 switch group 76, and the photovoltaic inverter 1511 is electrically connected to the solar photovoltaic panel 1512. By cooperating with the photovoltaic inverter 1511 and the S4 switch group 76, the solar photovoltaic panel 1512 can convert solar energy into electrical energy and supply it to the battery pack 9, the first power grid 1 and / or the second power grid 2, thereby reducing the energy consumption of the battery pack 9 during the power storage process for the first power grid 1 and / or the second power grid 2.

[0030] Furthermore, the new energy power generation device 15 further includes a wind power inverter 1521 and a wind turbine 1522. The wind power inverter 1521 is electrically connected to the incoming line end of the S4 switch group 76, and the wind turbine 1522 is electrically connected to the wind power inverter 1521; by cooperating with the wind turbine 1522, the wind power inverter 1521 and the S4 switch group 76, the wind energy potential is converted into electrical energy and supplied to the battery pack 9, the first power grid 1 and / or the second power grid 2, so as to realize the power storage of the battery pack 9 by combining solar energy and wind energy potential and the peak shaving of the first power grid 1 and / or the second power grid 2, effectively avoiding the situation that the new energy power generation device 15 with a single power generation method is affected by the geographical environment of different regions and causes insufficient supply, resulting in large losses to the first power grid 1 and / or the second power grid 2 during the energy storage process of the battery pack 9 and high power grid operation and maintenance costs.

[0031] Further, the new energy power generation device 15 further includes a hydroelectric inverter 1531 and a hydroelectric generator 1532. The hydroelectric inverter 1531 is electrically connected to the incoming line end of the S4 switch group 76, and the hydroelectric generator 1532 is electrically connected to the hydroelectric inverter 1531. The hydroelectric generator 1532 cooperates with the hydroelectric inverter 1531 and the S4 switch group 76 to convert the hydraulic potential energy into electrical energy and supply it to the battery pack 9, the first power grid 1 and / or the second power grid 2, so as to realize the storage of electricity in the battery pack 9 by solar energy, wind potential energy and hydraulic potential energy, and the peak shaving of the first power grid 1 and / or the second power grid 2, effectively avoiding the situation that the new energy power generation device 15 with a single power generation method is affected by the geographical environment in different regions, resulting in insufficient supply, large loss of the first power grid 1 and / or the second power grid 2 during the energy storage process of the battery pack 9, and high grid operation and maintenance costs.

[0032] Further, it further includes a second detection unit 16 electrically connected to the multi-channel programmable controller 10. The second detection unit 16 is used to detect the power generation amounts corresponding to different time periods of the solar photovoltaic panel 1512, the wind turbine 1522 and the hydroelectric generator 1532, and transmit the detected values to the multi-channel programmable controller 10. The multi-channel programmable controller 10 analyzes the historical power generation data, fully excavates the characteristics of the power generation amount in the historical data, extracts the characteristic values of the historical data, then constructs a characteristic training sample based on the characteristic values, trains the neural network model through the characteristic training sample, and obtains the prediction models of the solar energy, wind potential energy and hydraulic potential energy power generation amounts of the solar photovoltaic panel 1512, the wind turbine 1522 and the hydroelectric generator 1532 in different regions. The multi-channel programmable controller 10 controls the on-off of the multi-way switch module 7 according to the regional solar energy, wind potential energy and hydraulic potential energy power generation prediction models of the solar photovoltaic panel 1512, the wind turbine 1522 and the hydroelectric generator 1532, the power consumption load prediction models of the first power consumption load prediction module 3 and the second power consumption load prediction module 4, as well as the usage status and real-time stored power of a single battery pack 9, so as to control the multi-way switch module 7 to perform priority charge and discharge on the peak and valley power consumption time periods of the first power grid 1 and the second power grid 2 corresponding to different battery packs 9 to realize the distribution of clean energy. Furthermore, while maximizing the utilization of new energy storage, it ensures that the service life of each battery pack 9 is maximized to optimize and regulate the peak and valley power consumption of the first power grid 1 or the second power grid 2 in multiple ways to meet the power consumption needs of regional users and improve the power supply quality of the power grid.

[0033] Further, the multi-channel programmable controller 10 includes a storage module 101, an arithmetic module 102, a control module 103, and a communication module 104; through the communication module 104, it is convenient to write the preset interval values of the real-time charge and discharge performance of different battery packs 9 into the storage module 101 for storage, so that the arithmetic module 102 compares the real-time charge and discharge performance detection values of different models and different sizes of battery packs 9 detected by the first detection unit 11 with their corresponding preset interval values. When and only when the real-time charge and discharge performance of a single battery pack 9 exceeds the preset interval value, the control module 103 of the multi-channel programmable controller 10 controls the timely disconnection of the port of the multi-way switch module 7 corresponding to the single battery pack 9 and the networked alarm device 12 to give an early warning, thereby facilitating the precise management and control of different models of battery packs 9 to cooperate with the first power grid 1, the second power grid 2, and the new energy power generation equipment 15 for energy storage and peak shaving, and meeting the diverse supply demands of different models of battery packs 9 in the market. At the same time, the arithmetic module 102 performs operations on the real-time charge and discharge performance detection values of different models and different sizes of battery packs 9, the regional solar energy, wind potential energy, and hydraulic potential energy power generation prediction models of the solar photovoltaic panel 1512, the wind turbine 1522, and the hydraulic generator 1532, and the power consumption load prediction models of the first power consumption load prediction module 3 and the second power consumption load prediction module 4, and controls the on-off of the multi-way switch module 7 through the control module 103 to realize the peak shaving of different numbers and different usage states of battery packs 9 accessing the first power grid 1 or the second power grid 2 at different times, and the storage module 101 stores the historical usage state data of different battery packs 9 to facilitate the subsequent maintenance, upgrade, and standby of this bidirectional energy storage power inverter.

[0034] Further, the communication module 104 is communicatively connected to the cloud platform 17, thereby uploading the operation data of this bidirectional energy storage power inverter to the cloud platform 17, thereby reducing the data storage pressure and data operation pressure of the multi-channel programmable controller 10, and avoiding the situation that data loss affects the subsequent maintenance, upgrade, and standby of this bidirectional energy storage power inverter due to the damage of the storage module 101 of the multi-channel programmable controller 10.

[0035] Further, the first detection unit 11 includes two or more combinations of a current sensor 111, a voltage sensor 112, a temperature sensor 113, and a timer 114. By cooperating with the storage module 101, the operation module 102, the control module 103, and the communication module 104 on the multi-channel programmable controller 10, the current sensor 111 can detect the current in the real-time charging and discharging process of each battery pack 9 separately during the operation of the bidirectional energy storage power inverter, and achieve the effect of closed-loop automatic disconnection and early warning when the real-time charging and discharging performance of the battery pack 9 exceeds the preset interval value. Similarly, the voltage sensor 112 and the temperature sensor 113 can detect the voltage and temperature in the real-time charging and discharging process of each battery pack 9 respectively during the operation of the bidirectional energy storage power inverter, and achieve the effect of closed-loop automatic disconnection and early warning when the real-time charging and discharging performance of the battery pack 9 exceeds the preset interval value. In addition, the timer 114 times the single charging and discharging duration of each battery pack 9, and uniformly feeds the detected values back to the multi-channel programmable controller 10. The multi-channel programmable controller 10 comprehensively analyzes whether the usage status of different battery packs 9 meets the peak shaving requirements of the first power grid 1 or the second power grid 2 based on the charging and discharging duration, temperature difference change, voltage change, and current change of different battery packs 9. If not, the multi-channel programmable controller 10 controls the corresponding port of the multi-channel switch module 7 connected to the single battery pack 9 to be disconnected in time and the network alarm device 12 to give an early warning to remind the power grid operation and maintenance personnel to replace and maintain in time. Moreover, two or more combinations of the current sensor 111, the voltage sensor 112, the temperature sensor 113, and the timer 114 can be set according to the budget cost of the bidirectional energy storage power inverter, so as to reduce the cost and adapt to the power supply of regional power grids with different specifications, further improve the practicability of the bidirectional energy storage power inverter, and facilitate the popularization and application of the bidirectional energy storage power inverter.

[0036] It should be noted that in this article, relational terms such as first and second are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any actual relationship or order between these entities or operations. Moreover, the term "comprising", "including" or any other variation thereof is intended to cover non-exclusive inclusion, so that a process, method, article or device comprising a series of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such process, method, article or device. Without further limitation, an element defined by the phrase "comprising a..." does not exclude the presence of additional identical elements in the process, method, article or device comprising the element.

[0037] Although embodiments of the present invention have been shown and described, those of ordinary skill in the art will appreciate that various changes, modifications, substitutions and variations can be made to these embodiments without departing from the principles and spirit of the present invention. The scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A bidirectional energy storage power inverter, comprising a first power grid (1) and a second power grid (2), and a first power load prediction module (3) and a second power load prediction module (4) for detecting peak and valley time periods of power consumption of the first power grid (1) and the second power grid (2), characterized in that: The first power grid (1) is electrically connected to a first transformer (5), the first transformer (5) is electrically connected to a first grid-connected inverter (6), the first grid-connected inverter (6) is electrically connected to a multi-way switch module (7), the multi-way switch module (7) is electrically connected to a plurality of DC / DC converters (8), each DC / DC converter (8) is electrically connected to a battery pack (9), the multi-way switch module (7) is electrically connected to a multi-way programmable controller (10), the multi-way programmable controller (10) is electrically connected to a first power load prediction module (3) and a second power load prediction module (4), the multi-way programmable controller (10) is electrically connected to a first detection unit (11) and a network alarm device (12), the first detection unit (11) is used to detect the charging and discharging performance of each battery pack (9), and the detection unit (11) is used to detect the charging and discharging performance of each battery pack (9) if and only if the detection is successful. When the real-time charge and discharge performance of a single storage battery group (9) exceeds a preset interval value, the multi-way programmable controller (10) controls the port of the multi-way switch module (7) corresponding to the single storage battery group (9) to be disconnected in time and the network alarm device (12) to issue an early warning, the multi-way switch module (7) is electrically connected to a second grid-connected inverter (13), the second grid-connected inverter (13) is electrically connected to a second transformer (14), the second transformer (14) is electrically connected to a second power grid (2), and the multi-way programmable controller (10) is used to control the on and off of the multi-way switch module (7) according to the first power load prediction module (3) and / or the second power load prediction module (4) so ​​as to control the priority charge and discharge of different storage battery groups (9) corresponding to the power peak and valley time periods of the first power grid (1) or the second power grid (2).

2. A bidirectional energy storage power inverter according to claim 1, characterized in that: The multi-way switch module (7) comprises an S1 switch group (71), an S2 switch group (72), an S3 switch group (73), a main line (74) and a first sub-line (75); the incoming line end of the S1 switch group (71) is electrically connected to the first grid-connected inverter (6); the outgoing line end of the S1 switch group (71) is electrically connected to the incoming line end of the S2 switch group (72) through a plurality of main lines (74); the outgoing line end of the S2 switch group (72) is electrically connected to each DC / DC converter (8); each main line (74) is electrically connected to a first sub-line (75); the first sub-line (75) is electrically connected to the incoming line end of the S3 switch group (73); and the outgoing line end of the S3 switch group (73) is electrically connected to the second power grid (2).

3. A bidirectional energy storage power inverter according to claim 2, characterized in that: The multi-way switch module (7) further comprises an S4 switch group (76) and a second auxiliary line (77), each main line (74) being electrically connected to the second auxiliary line (77), the second auxiliary line (77) being electrically connected to the outlet end of the S4 switch group (76), and the inlet end of the S4 switch group (76) being electrically connected to the new energy power generation equipment (15).

4. A bidirectional energy storage power inverter according to claim 3, characterized in that: The new energy power generation equipment (15) comprises a photovoltaic inverter (1511) and a solar photovoltaic panel (1512); the photovoltaic inverter (1511) is electrically connected to the incoming line end of the S4 switch group (76); and the photovoltaic inverter (1511) is electrically connected to the solar photovoltaic panel (1512).

5. A bidirectional energy storage power inverter according to claim 4, characterized in that: The new energy power generation equipment (15) further comprises a wind power inverter (1521) and a wind turbine generator (1522); the wind power inverter (1521) is electrically connected to the incoming line end of the S4 switch group (76); and the wind turbine generator (1522) is electrically connected to the wind power inverter (1521).

6. A bidirectional energy storage power inverter according to claim 5, characterized in that: The new energy power generation equipment (15) further comprises a hydroelectric inverter (1531) and a hydroelectric generator (1532); the hydroelectric inverter (1531) is electrically connected to the incoming line end of the S4 switch group (76); and the hydroelectric generator (1532) is electrically connected to the hydroelectric inverter (1531).

7. A bidirectional energy storage power inverter according to claim 6, characterized in that: The invention also comprises a second detection unit (16) electrically connected to the multi-channel programmable controller (10), the second detection unit (16) being used to detect the power generation of the solar photovoltaic panel (1512), the wind generator (1522) and the hydroelectric generator (1532), and transmit the detection value to the multi-channel programmable controller (10), the multi-channel programmable controller (10) regulating the on-off of the multi-channel switch module (7) according to the power generation of the solar photovoltaic panel (1512), the wind generator (1522) and the hydroelectric generator (1532) and the first power load prediction module (3) and the second power load prediction module (4), thereby controlling different storage battery groups (9) to perform priority charging and discharging corresponding to the peak and valley time periods of the first power grid (1) and the second power grid (2) to achieve the distribution of clean energy.

8. A bidirectional energy storage power inverter according to any one of claims 1 to 7, characterized in that: The multi-channel programmable controller (10) comprises a storage module (101), a calculation module (102), a control module (103) and a communication module (104).

9. A bidirectional energy storage power inverter according to claim 8, characterized in that: The communication module (104) is communicatively connected to the cloud platform (17).

10. A bidirectional energy storage power inverter according to claim 9, characterized in that: The first detection unit (11) includes a combination of two or more of a current sensor (111), a voltage sensor (112), a temperature sensor (113) and a timer (114).

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