Bidirectional energy storage inverter system of high-voltage and low-voltage double batteries
By using a bidirectional energy storage inverter system with high and low voltage dual batteries, the problem of insufficient energy release under instantaneous 3 times overload of traditional single battery systems is solved, achieving efficient power allocation and system stability, reducing costs and improving the system's adaptability and reliability.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- ZHENHUA RESEARCH INSTITUTE (GUIYANG) CO LTD
- Filing Date
- 2024-12-26
- Publication Date
- 2026-04-10
AI Technical Summary
Traditional single-battery energy storage inverter systems cannot release enough energy under instantaneous 3 times overload conditions, thus failing to meet complex and ever-changing energy demands.
The bidirectional energy storage inverter system employs both high- and low-voltage batteries, including a low-voltage battery system and a high-voltage battery system. These are coupled through a first bidirectional LLC module and a second bidirectional LLC module, and connected to the external power grid in conjunction with a PFC converter module. The control system monitors the system in real time and provides power input from the high-voltage battery system when the bus voltage drops.
It enables the provision of power input at critical moments, reduces costs by about half, improves the system's economy and practicality, better adapts to different load requirements and operating conditions, and enhances overall performance and reliability.
Smart Images
Figure CN224110883U_ABST
Abstract
Description
TECHNICAL FIELD
[0001] The utility model relates to the field of energy storage inverter, specifically, relate to a high low voltage double -battery's two -way energy storage inverter system. BACKGROUND
[0002] With the rapid development of new energy industry, the application of renewable energy such as photovoltaic power generation and wind power generation is increasingly widespread. However, these energy sources have the problems of intermittency and instability, and efficient energy storage systems are needed to balance supply and demand. Traditional energy storage inverter systems mostly use single battery systems, which are difficult to meet the complex and changing energy demand. Especially in the case of instantaneous 3 times overload, a single low-voltage battery system cannot release enough energy. SUMMARY
[0003] The utility model aims at providing a high low voltage double -battery's two -way energy storage inverter system, which can meet the requirement of instantaneous large rate discharge.
[0004] The embodiment of the utility model is realized as follows:
[0005] The two-way energy storage inverter system of a high low voltage double -battery of the embodiment of the application comprises a low-voltage battery system, a high-voltage battery system, an inverter system, a bus and a control system, the inverter system comprises a first bidirectional LLC module, a second bidirectional LLC module and a PFC commutation module, the low-voltage battery system and the high-voltage battery system are connected with the first bidirectional LLC module and the second bidirectional LLC module respectively, and the low-voltage battery system and the high-voltage battery system are coupled through the first bidirectional LLC module and the second bidirectional LLC module respectively, the low-voltage battery system and the high-voltage battery system are connected with the bus through the first bidirectional LLC module and the second bidirectional LLC module respectively, and the PFC commutation module is used to be connected with external power grid, the control system is used to detect the voltage of the bus, when the bus voltage drops more than the set voltage value, the high-voltage battery system delivers voltage to the bus.
[0006] In a possible implementation, the first bidirectional LLC module comprises four MOS tubes, every two MOS tubes in the four MOS tubes are connected in series, and each works for 50% of the time when the low-voltage battery system delivers voltage.
[0007] In a possible implementation, the second bidirectional LLC module comprises four MOS tubes, every two MOS tubes in the four MOS tubes are connected in series, and each works for 50% of the time when the high-voltage battery system delivers voltage.
[0008] In a possible implementation, the PFC commutation module includes four IGBTs, and the PFC commutation module converts direct current into stable alternating current output through the four IGBTs according to an H4 topology structure, and delivers voltage to an external power grid.
[0009] In a possible implementation, the PFC commutation module includes four IGBTs, and each two of the four IGBTs are connected in series and work for 50% of the time respectively when the bidirectional energy storage inversion system delivers voltage.
[0010] In a possible implementation, the bidirectional energy storage inversion system further includes an electric reactor and a transformer, and the electric reactor and the transformer are connected with the PFC commutation module respectively.
[0011] In a possible implementation, the inversion system further includes a first inductor and a second inductor, and the first inductor and the second inductor are connected with four MOS tubes of the first bidirectional LLC module and the second bidirectional LLC module respectively, and the first inductor is coupled with the second inductor.
[0012] In a possible implementation, the inversion system further includes a third inductor, and the third inductor is connected with four IGBTs of the PFC commutation module.
[0013] The high-voltage battery system can provide power input at a critical moment, the low-voltage battery system does not need to select a high-rate discharge power cell, and an ordinary cell can meet the requirement of instant high-rate discharge of the system, so that the cost is reduced by half of the cost of using the power cell, and the economy and practicability of the system are improved. BRIEF DESCRIPTION OF DRAWINGS
[0014] In order to more clearly illustrate the technical scheme of the embodiments of the present application, the following will briefly introduce the drawings needed to be used in the embodiments, and it should be understood that the following drawings only show some embodiments of the present application, and therefore should not be regarded as a limitation to the scope, and for those skilled in the art, other related drawings can also be obtained without creative labor on the basis of these drawings.
[0015] Figure 1 FIG. 1 is a circuit structure diagram of a bidirectional energy storage inversion system of a high-low voltage double battery according to an embodiment of the present application.
[0016] Icon: 1, low-voltage battery system; 2, high-voltage battery system; 3, bus; 4, MOS tube; 5, IGBT; 6, first inductor; 7, second inductor; 8, third inductor. DETAILED DESCRIPTION
[0017] In order to make the purpose, technical scheme and advantages of the embodiments of the present application clearer, the technical scheme of the embodiments of the present application will be described clearly and completely below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are some embodiments of the present application, rather than all the embodiments of the present application. The components of the embodiments of the present application described and shown in the drawings herein can be arranged and designed in various different configurations.
[0018] Therefore, the following detailed description of the embodiments of the present application provided in the drawings is not intended to limit the scope of the claimed present application, but only represents selected embodiments of the present application. All other embodiments obtained by those of ordinary skill in the art based on the embodiments in the present application without creative labor are within the scope of protection of the present application.
[0019] It should be noted that: similar reference numbers and letters represent similar items in the following drawings, therefore, once an item is defined in one drawing, it does not need to be further defined and explained in subsequent drawings.
[0020] In the description of the present application, it should be noted that the orientations or positional relationships indicated by the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc. are based on the orientations or positional relationships shown in the drawings, or the orientations or positional relationships in which the product of the present application is usually placed during use, and are only for the convenience of describing the present application and simplifying the description, and therefore cannot be understood as indicating or implying that the indicated device or element must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as limiting the present application. In addition, the terms "first", "second", "third", etc. are only used for differentiation in description, and cannot be understood as indicating or implying relative importance.
[0021] In addition, the terms "horizontal", "vertical", etc. do not mean that the components must be absolutely horizontal or vertical, but can be slightly inclined. For example, "horizontal" only means that its direction is relatively more horizontal than "vertical", and does not mean that the structure must be completely horizontal, but can be slightly inclined.
[0022] In the description of the utility model, it also needs to be explained that, unless there is explicit provision and limitation, the terms "set", "install", "connect" and "connect" should be understood broadly, for example, it can be fixed connection, or it can be detachable connection, or it can be integrally connected, it can be mechanical connection, or it can be electrical connection, it can be directly connected, or it can be indirectly connected through intermediate medium, it can be the communication inside two elements, for ordinary skilled in the art, the specific meaning of the above terms in the utility model can be understood according to the specific circumstances.
[0023] As shown in Figure 1 The bidirectional energy storage inverter system of the high-low voltage dual battery according to the embodiment of the application comprises a low-voltage battery system 1, a high-voltage battery system 2, an inverter system, a bus 3 and a control system, the inverter system comprises a first bidirectional LLC module, a second bidirectional LLC module and a PFC commutation module, the low-voltage battery system 1 and the high-voltage battery system 2 are connected with the first bidirectional LLC module and the second bidirectional LLC module respectively, and the low-voltage battery system 1 and the high-voltage battery system 2 are coupled through the first bidirectional LLC module and the second bidirectional LLC module respectively, the low-voltage battery system 1 and the high-voltage battery system 2 are connected with the bus 3 through the first bidirectional LLC module and the second bidirectional LLC module respectively, and the PFC commutation module is used for connecting with an external power grid, the control system is used for detecting the voltage of the bus 3, and when the voltage of the bus 3 drops and exceeds a set voltage value, the high-voltage battery system 2 delivers voltage to the bus 3.
[0024] In combination with the above embodiment, the inverter system has bidirectional power conversion capability, can realize accurate conversion between the direct current of the low-voltage battery system 1 and the high-voltage battery system 2 and alternating current, and between the external alternating current and the direct current of the low-voltage battery system, so as to realize flexible deployment and recycling of electric energy.
[0025] In the daily operation process, the low-voltage battery system 1 bears the discharge work alone, and the high-voltage battery system 2 is in a floating standby state. The direct current output by the low-voltage battery system 1 is first chopped by four MOS tubes 4 (MOSFET, metal-oxide semiconductor field effect transistor) of the first LLC module full-bridge, so as to convert the voltage into a form suitable for subsequent processing. The voltage after chopping is boosted to the voltage level of the bus 3 through the full-bridge rectifier circuit of the second LLC module full-bridge, and finally the 4 IGBTs 5 (Insulate-Gate Bipolar Transistor, Insulated Gate Bipolar Transistor) on the inverter side are in accordance with the H4 topology structure to perform inversion, so as to convert the direct current into stable alternating current output, and supply power to the external load.
[0026] The system is equipped with a high-voltage battery system 2 and a low-voltage battery system 1, respectively used to store electrical energy of different voltage levels. The low-voltage battery system 1 usually has a larger capacity and is suitable for long-term and stable charging and discharging process, providing continuous basic energy support for the system. The high-voltage battery system 2 has a relatively small capacity but has the ability to discharge instantaneously with high power, mainly used to quickly release energy to stabilize the bus voltage and ensure the stable operation of the system when the system faces sudden high-power demand or bus voltage fluctuation. Both groups of batteries can be flexibly configured and expanded according to the actual application scene and demand to meet the diversified energy storage needs.
[0027] The control system monitors the charging and discharging state of the high-voltage battery system 2 and the low-voltage battery system 1 in real time, including battery voltage, current, temperature and other parameters, as well as the operating state of the inverter system, such as output power, efficiency, switching element state, etc., while closely monitoring the power supply situation of the external power grid, such as voltage fluctuation, frequency change, etc. According to the real-time monitoring data, the control system uses advanced algorithms and control logic to dynamically adjust the output power of the inverter and the charging and discharging strategy. For example, when the power supply of the external power grid is stable and the load demand is low, the control system can control the inverter system to store excess electrical energy to the low-voltage battery system; when the power supply of the external power grid is unstable or the load demand suddenly increases, the output of the inverter is adjusted in time to ensure stable power supply of the system. In addition, the control system also has perfect protection function, through real-time monitoring of system operating parameters, once overvoltage, overcurrent, overtemperature, short circuit and other abnormal conditions are found, corresponding protection measures are taken immediately, such as cutting off the circuit, adjusting the output power, etc., to ensure the safe operation of the equipment and the system.
[0028] When the control system monitors that the bus voltage drops and falls below the pre-set threshold, the high-voltage battery system 2 starts the discharging program quickly. The direct current released by the high-voltage battery system 2 is directly supplemented to the bus 3, timely making up for the energy shortage of the bus 3, effectively supporting the bus 3 voltage, and preventing it from further falling. This process ensures that the system can maintain stable power output when facing instant high-power load demand, fully plays the synergistic effect of the high and low voltage battery systems 2, and realizes efficient operation of the system.
[0029] Because the high-voltage battery system 2 can provide power input at critical moments, the low-voltage battery system 1 does not need to choose high-rate discharge power cells, and ordinary cells can meet the requirements of instant high-rate discharge of the system. Not only significantly reduces the cost, about half of the cost of using power cells, but also improves the economy and practicability of the system. At the same time, by reasonably configuring the capacity and performance of the high-voltage battery system 2 and the low-voltage battery system 1, the system can better adapt to different load demands and operating conditions, further improving the overall performance and reliability.
[0030] The bidirectional energy storage inverter system of the high-low voltage double battery of the embodiment of the application further comprises a first inductor 6 and a second inductor 7, the first inductor 6 and the second inductor 7 are respectively connected with the four MOS tubes 4 of the first bidirectional LLC module and the second bidirectional LLC module, and the first inductor 6 is coupled with the second inductor 7. The inverter system further comprises a third inductor 8, and the third inductor 8 is connected with the four IGBTs 5 of the PFC commutation module.
[0031] In summary, since the high-voltage battery system 2 can provide power input at a critical moment, the low-voltage battery system does not need to select a power cell with a large discharge rate, and an ordinary cell can meet the requirement of instant large discharge rate of the system. Not only the cost is significantly reduced, which is about half of the cost of using a power cell, but also the economy and practicability of the system are improved. At the same time, by reasonably configuring the capacity and performance of the high-voltage battery system 2 and the low-voltage battery system 1, the system can better adapt to different load requirements and operating conditions, and further improve the overall performance and reliability.
[0032] The above only describes the preferred embodiments of the present application and is not intended to limit the present application. For those skilled in the art, the present application can be variously changed and modified. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application shall be included in the protection scope of the present application.
Claims
1. A bidirectional energy storage inverter system with high and low voltage dual batteries, characterized in that, The system includes a low-voltage battery system, a high-voltage battery system, an inverter system, a bus, and a control system. The inverter system includes a first bidirectional LLC module, a second bidirectional LLC module, and a PFC converter module. The low-voltage battery system and the high-voltage battery system are respectively connected to the first bidirectional LLC module and the second bidirectional LLC module, and are coupled to each other through the first bidirectional LLC module and the second bidirectional LLC module, respectively. The low-voltage battery system and the high-voltage battery system are respectively connected to the bus through the first bidirectional LLC module and the second bidirectional LLC module, respectively. The PFC converter module is used to connect to the external power grid. The control system is used to detect the voltage of the bus. When the bus voltage drops below a set voltage value, the high-voltage battery system supplies voltage to the bus. The first bidirectional LLC module includes four MOS transistors, with each pair of the four MOS transistors connected in series and operating for 50% of the time when the low-voltage battery system is supplying voltage; The second bidirectional LLC module includes four MOS transistors, with each pair of the four MOS transistors connected in series and operating for 50% of the time when the high-voltage battery system is supplying voltage; The PFC converter module includes four IGBTs. The PFC converter module uses the four IGBTs to perform inversion according to the H4 topology to convert DC power into stable AC power output to supply voltage to the external power grid. The PFC converter module includes four IGBTs, with each pair of IGBTs connected in series and operating for 50% of the time when the bidirectional energy storage inverter system is supplying voltage.
2. The bidirectional energy storage inverter system with high and low voltage dual batteries according to claim 1, characterized in that, The bidirectional energy storage inverter system also includes a reactor and a transformer, which are respectively connected to the PFC converter module.
3. The bidirectional energy storage inverter system with high and low voltage dual batteries according to claim 2, characterized in that, The inverter system further includes a first inductor and a second inductor, the first inductor and the second inductor being connected to the four MOS transistors of the first bidirectional LLC module and the second bidirectional LLC module, respectively, and the first inductor and the second inductor being coupled.
4. The bidirectional energy storage inverter system with high and low voltage dual batteries according to claim 3, characterized in that, The inverter system also includes a third inductor, which is connected to the four IGBTs of the PFC converter module.