Optical storage rectification inversion system
Through the optical storage and rectification inverter system integrating inverter, rectifier, monitoring module, photovoltaic module, and energy storage units, the problem that the existing optical storage system cannot optimize power use in the restricted power consumption area is solved, and the reduction of power expenditure is achieved.
Patent Information
- Application Number
- CN202422178483.6
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-09-05
- Publication Date
- 2025-07-01
- Estimated Expiration
- 2034-09-05
AI Technical Summary
The existing optical storage system cannot effectively optimize power consumption in the restricted power consumption area, resulting in high power expenditure.
Design a photo-storage and rectification inverter system, integrating inverter, rectifier and monitoring modules, connecting them with photovoltaic modules and energy storage units, realizing intelligent monitoring and allocation, and providing new solutions for photovoltaic energy utilization, peak cutting and filling.
It achieves maximum power consumption optimization, reduces electricity expenses, and is suitable for areas with limited power load.
Smart Images
Figure CN223052766U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to a photovoltaic energy storage rectifying and inverting system, and relates to the technical field of photovoltaic energy storage equipment. Background Technique
[0002] With the development of global economic globalization and the global population, more energy is required to meet the needs of economic and population development. The continuous reduction of the reserves of non-renewable energy sources such as oil and coal has made the development of new energy an inevitable trend.
[0003] In the field of photovoltaic power generation, the conventional design is that photovoltaic modules receive light energy, and after passing through an inverter, it is sent to a distribution box and connected to the power grid. However, when affected by external environmental conditions, it is easy to impact the power grid or affect the normal operation of the load. Therefore, an energy storage module is added in the existing technology to obtain a smoother power output. However, in some areas with restricted power consumption, the existing photovoltaic energy storage system cannot perform power consumption optimization well and cannot reduce the expenditure of electricity costs. Content of the Utility Model
[0004] The purpose of the utility model is to provide a photovoltaic energy storage rectifying and inverting system for the defects or deficiencies in the existing technology. The inverter, rectifier, and monitoring module are integrated into one body. After being connected to the photovoltaic module and the energy storage unit, it conducts intelligent monitoring and allocation, providing new solutions for photovoltaic energy utilization, peak shaving and filling, etc. in areas with restricted power consumption loads, realizing the maximum power consumption optimization and achieving the purpose of reducing the expenditure of electricity costs.
[0005] To achieve the above purpose, the utility model adopts the following technical solutions: It includes an all-in-one machine 1, a photovoltaic module 2, an energy storage unit 3, and an energy storage energy management system 7. The input end of the all-in-one machine 1 is the DC side and is connected to the photovoltaic module 2. The output end of the all-in-one machine 1 is the AC side and is connected to the AC power grid, and the all-in-one machine is connected to the energy storage unit 3. The all-in-one machine 1 includes a DC bus 11, a bidirectional DC / AC conversion module group 12, a DC / DC module group 13, and a monitoring unit 14. The photovoltaic module 2 is connected to the DC bus 11 through the DC / DC module group 13. The energy storage unit 3 is connected to the DC bus 11. The DC end of the bidirectional DC / AC conversion module group 12 is connected to the DC bus 11, and the AC end is provided with a main circuit breaker 4 and is connected to the AC power grid through the main circuit breaker 4. The DC / DC module group 13 is connected to the monitoring unit 14, and the energy storage energy management system 7 is connected to the all-in-one machine 1 and the energy storage unit 3.
[0006] Further, the monitoring unit 14 is composed of multiple multi-functional electricity meter devices and is arranged on the load side and the output end of the all-in-one machine 1.
[0007] Further, a first circuit breaker 5 is also provided between the bidirectional DC / AC conversion module group 12 and the AC power grid, and the first circuit breaker 5 is located between the monitoring unit 14 connecting the load and the output end of the all-in-one machine 1.
[0008] Further, a second circuit breaker 6 is provided between the DC / DC module group 13 and the photovoltaic module 2.
[0009] Further, both the bidirectional DC / AC conversion module group 12 and the DC / DC module group 13 are in a module group structure and are composed of multiple identical modules.
[0010] Further, the energy storage unit 3 includes a battery unit, a BMS system, and a high-voltage box. The battery unit is respectively connected to the BMS system and the high-voltage box, and the BMS system is also connected to the monitoring unit 14, and the high-voltage box is connected to the DC bus 11.
[0011] Further, the battery unit is composed of multiple battery packs, and the number of battery packs can be increased or decreased.
[0012] Further, the DC side adopts a DC direct coupling method.
[0013] After adopting the above technical solution, the beneficial effects of the present utility model are as follows: integrating an inverter, a rectifier, and a monitoring module into one, and performing intelligent monitoring and allocation after connecting with a photovoltaic module and an energy storage unit, providing new solutions for photovoltaic energy utilization and peak shaving and filling in areas with restricted power consumption loads, realizing the maximum optimization of power consumption, and achieving the purpose of reducing power consumption costs. BRIEF DESCRIPTION OF THE DRAWINGS
[0014] In order to more clearly illustrate the technical solutions in the embodiments of the present utility model or the prior art, the following will briefly introduce the drawings required for use in the description of the embodiments or the prior art. Obviously, the following drawings are only some embodiments of the present utility model. For those of ordinary skill in the art, other drawings can be obtained based on these drawings without creative efforts.
[0015] Figure 1 It is a structural framework schematic diagram of the present utility model;
[0016] Figure 2 It is a working principle framework schematic diagram of the present utility model.
[0017] Description of the reference numerals: all-in-one machine 1, photovoltaic module 2, energy storage unit 3, energy storage energy management system 7, main circuit breaker 4, first circuit breaker 5, second circuit breaker 6, energy storage energy management system 7, DC bus 11, bidirectional DC / AC conversion module group 12, DC / DC module group 13, monitoring unit 14. Detailed implementation mode
[0018] Referring to Figure 1-2 As shown, the technical solution adopted in this detailed implementation mode is as follows: It includes an all-in-one machine 1, a photovoltaic module 2, an energy storage unit 3, and an energy storage energy management system 7. The input end of the all-in-one machine 1 is the DC side and is connected to the photovoltaic module 2. The output end of the all-in-one machine 1 is the AC side and is connected to the AC power grid, and the all-in-one machine is connected to the energy storage unit 3. The all-in-one machine 1 includes a DC bus 11, a bidirectional DC / AC converter module group 12, a DC / DC module group 13, and a monitoring unit 14. The photovoltaic module 2 is connected to the DC bus 11 through the DC / DC module group 13, the energy storage unit 3 is connected to the DC bus 11, the DC end of the bidirectional DC / AC converter module group 12 is connected to the DC bus 11, and the AC end is provided with a main circuit breaker 4 and is connected to the AC power grid through the main circuit breaker 4. The DC / DC module group 13 is connected to the monitoring unit 14, and the energy storage energy management system 7 is connected to the all-in-one machine 1 and the energy storage unit 3. In this embodiment, the bidirectional DC / AC converter module group and the DC / DC module group rectify and invert the photovoltaic electric energy. Under the allocation of the energy storage energy management system, a part is sent from the output end of the all-in-one machine into the AC power grid, and a part enters the energy storage unit for storage;
[0019] The monitoring unit monitors the whole system. The monitoring unit 14 is composed of multiple multifunctional electric meter devices and is set on the load side and the output end of the all-in-one machine 1. In another embodiment, the monitoring unit can also be composed of a local controller, an EMS system or a microgrid controller. Through the monitoring of the monitoring unit and analysis and judgment in the energy storage energy management system, it will automatically make an intelligent judgment on the local power consumption situation. Specifically, when the photovoltaic energy is sufficient, the energy storage energy management system allocates and stores the excess electric energy, and after the DC / DC module group boosts or buck-boosts the current, it stores it in the energy storage unit, and a part of the electric energy is normally output for use; when the photovoltaic energy is insufficient, the monitoring unit detects that the photovoltaic power generation is insufficient, and the energy storage energy management system quickly calls the electric energy of the energy storage unit and supplements it through both the commercial power AC / DC at the same time to ensure normal and stable power supply. This method can quickly make an intelligent response when the power supply system suddenly fails and causes abnormal power supply power; third, when it is at night or the photovoltaic module cannot generate electricity, the energy storage energy management system will call the low-price commercial power to drive the load to operate, and at the same time use the low-valley electricity price commercial power to charge the energy storage unit to ensure the normal and continuous operation of the whole system. Through the above three intelligent control methods, it is possible to realize the unified scheduling of the all-in-one electric energy, and realize that in the case of energy storage grid connection, the system detects the load demand and automatically adapts to the power grid, energy storage, and photovoltaic to solve the problem of using photovoltaic and energy storage at the same time in the scenario where the factory or construction site has a limited daily power consumption capacity of the power grid, providing new solutions for photovoltaic energy utilization, peak shaving and filling, etc. Realize the maximum optimization of power consumption to reduce the problem of electricity cost expenditure.
[0020] More specifically, a first circuit breaker 5 is also provided between the bidirectional DC / AC conversion module group 12 and the AC power grid, and the first circuit breaker 5 is located between the monitoring unit 14 connecting the load and the output end of the all-in-one machine 1. The first circuit breaker is used as an isolator to ensure that the grid-connected electric energy meets the requirements and prevent impact on the power grid. When the electric energy output is abnormal, the first circuit breaker will cut off the path and not transmit electric energy. Only when the monitoring unit detects that the electric energy output is normal will it maintain the path state, thus effectively ensuring the normal operation of the load end.
[0021] More specifically, a second circuit breaker 6 is provided between the DC / DC module group 13 and the photovoltaic module 2. The second circuit breaker controls the electric energy received by the photovoltaic. Similarly, when an abnormality occurs, it disconnects under the control of the monitoring unit to ensure the normal operation of the system.
[0022] More specifically, both the bidirectional DC / AC conversion module group 12 and the DC / DC module group 13 are of a module group structure and are composed of multiple identical modules. In this embodiment, both the bidirectional DC / AC conversion module group and the DC / DC module group are of a module group structure. The modular design can flexibly meet different capacity integration requirements, which is beneficial to large-scale production, installation, operation and maintenance, facilitates system expansion and product mass production, reduces costs. Among them, the DC / DC module group is composed of several single-way DC / DC converter modules and bidirectional DC / DC converter modules, which can better perform single-way or two-way flow step-down or step-up.
[0023] More specifically, the energy storage unit 3 includes a battery unit, a BMS system, and a high-voltage box. The battery unit is respectively connected to the BMS system and the high-voltage box, and the BMS system is also connected to the monitoring unit 14. The high-voltage box is connected to the DC bus 11. In this embodiment, the BMS system specifically monitors and controls the battery unit and feeds back the data to the energy storage energy management system for unified control and allocation. The battery unit is composed of battery packs connected in series / parallel through different modules. The high-voltage box serves as a transfer station, connecting the DC bus and the battery unit.
[0024] More specifically, the battery unit is composed of multiple battery packs, and the number of battery packs can be increased or decreased. According to the specific requirements of the system, the battery capacity of the battery unit can be expanded to meet specific power consumption requirements.
[0025] More specifically, the DC side adopts a DC direct coupling method.
[0026] Working principle of the present utility model: When using this system in an area with sufficient light energy, the light energy is divided into two paths through the DC / DC module group 13 to the DC bus 11. One path of the redundant electric energy enters the high-voltage box and is stored in the battery unit, and the other path enters the bidirectional DC / AC conversion module group 12. After conversion, it is sent to the AC power grid to drive the load to operate. When the photovoltaic power generation is insufficient, the monitoring unit 14 detects that the input power of the photovoltaic module 2 is insufficient, and the energy storage energy management system 7 allocates the battery unit to start power supply. At the same time, the commercial power is synchronously used for power supply. The two power supply methods are carried out simultaneously, and the photovoltaic module 2 still provides electric energy for conversion, so as to reduce the use of commercial power and achieve the purpose of reducing the expenditure of electric energy costs. In addition, when the photovoltaic cannot receive light energy for conversion, the energy storage energy management system 7 supplements and uses low-price commercial power, and uses the commercial power at the valley electricity price to charge the battery unit to ensure the normal and stable supply of electric energy.
[0027] The above is only used to illustrate the technical solution of the present utility model and not to limit it. Any other modifications or equivalent replacements made by those of ordinary skill in the art to the technical solution of the present utility model shall be covered by the scope of the claims of the present utility model as long as they do not depart from the spirit and scope of the technical solution of the present utility model.
Claims
1. A photovoltaic storage rectifier inverter system, characterized in that: It comprises an integrated machine (1), a photovoltaic module (2), an energy storage unit (3), and an energy storage energy management system (7). The input end of the integrated machine (1) is a DC side connected to the photovoltaic module (2), the output end of the integrated machine (1) is an AC side connected to an AC power grid, and the integrated machine is connected to the energy storage unit (3). The integrated machine (1) comprises a DC bus (11), a bidirectional DC / AC conversion module group (12), a DC / DC module group (13), a monitoring unit (14), and the photovoltaic module (2 ) is connected to the DC bus (11) through a DC / DC module group (13), the energy storage unit (3) is connected to the DC bus (11), the DC end of the bidirectional DC / AC conversion module group (12) is connected to the DC bus (11), the AC end is provided with a main circuit breaker (4), and is connected to the AC power grid through the main circuit breaker (4), the DC / DC module group (13) is connected to the monitoring unit (14), and the energy storage energy management system (7) is connected to the integrated machine (1) and the energy storage unit (3).
2. A photovoltaic storage rectifier inverter system according to claim 1, characterized in that: The monitoring unit (14) is composed of a plurality of multifunctional electric meter devices and is arranged on the load side and the output end of the integrated machine (1).
3. The photovoltaic storage rectifier inverter system according to claim 1, characterized in that: A first circuit breaker (5) is also provided between the bidirectional DC / AC conversion module group (12) and the AC power grid, and the first circuit breaker (5) is located between the monitoring unit (14) connected to the load and the output end of the integrated machine (1).
4. The photovoltaic storage rectifier inverter system according to claim 1, characterized in that: A second circuit breaker (6) is provided between the DC / DC module group (13) and the photovoltaic assembly (2).
5. The photovoltaic storage rectifier inverter system according to claim 1, characterized in that: The bidirectional DC / AC conversion module group (12) and DC / DC module group (13) are both module group structures, consisting of a plurality of identical modules.
6. The photovoltaic storage rectifier inverter system according to claim 1, characterized in that: The energy storage unit (3) comprises a battery unit, a BMS system, and a high-voltage box. The battery unit is connected to the BMS system and the high-voltage box respectively, and the BMS system is also connected to a monitoring unit (14). The high-voltage box is connected to a DC bus (11).
7. The photovoltaic storage rectifier inverter system according to claim 6, characterized in that: The battery unit is composed of a plurality of battery packs, and the number of battery packs can be increased or decreased.
8. The photovoltaic storage rectifier inverter system according to claim 1, characterized in that: The DC side adopts a DC coupling mode.