Dual-inverter module powered apparatus, control method, and refrigeration system

Abstract

The application discloses a dual-inverter module power supply device, a control method and a refrigeration system. The dual-inverter module power supply device comprises a battery, a first bidirectional inverter module, a second bidirectional inverter module, a first switch module, a second switch module, a third switch module and a control module. The control module controls the first switch module, the second switch module and the third switch module according to the power of the battery and the power demand of the load, so that the first bidirectional inverter module charges the battery or discharges the load, and the second bidirectional inverter module charges the battery or discharges the load. The technical scheme realizes dynamic separation and intelligent switching of charging and discharging functions, can flexibly schedule the working states of the two inverter modules according to the power of the battery and the power demand of the load, and effectively avoids the conflicts and limitations of traditional single-inverter modules when power supply and charging are taken into account.

Description

Technical Field

[0001] This invention relates to the field of energy storage inverter module technology, and in particular to a dual inverter module power supply device, control method and refrigeration system. Background Technology

[0002] In applications such as distributed energy systems, home energy storage systems, electric vehicle charging systems, and cold chain power supply, inverter modules, as core devices connecting DC energy storage units to AC loads or the power grid, play a crucial role in energy conversion and dispatch. Traditional energy storage systems typically employ a single bidirectional inverter module, which monitors system status to control battery charging and discharging, and supplies power to the load or charges from the grid as needed. However, this structure is functionally limited and lacks sufficient flexibility and redundancy when both charging and discharging demands exist simultaneously. In certain operating conditions, such as when the battery is low but the load still requires continuous power, or when the battery is fully charged but the grid has charging capabilities, a single inverter module system struggles to handle the dual tasks of energy management, potentially leading to power imbalances, battery overcharging, or load power loss. Furthermore, system stability is easily affected by grid fluctuations or faults. Summary of the Invention

[0003] This invention provides a dual inverter module power supply device and its control method to solve the above-mentioned technical problems.

[0004] A first aspect of the present invention provides a dual inverter module power supply device, comprising:

[0005] Battery;

[0006] The first bidirectional inverter module includes a first DC port, a first AC port and a first bus voltage port, wherein the first DC port is connected to the battery.

[0007] The second bidirectional inverter module includes a second DC port, a second AC port, and a second bus voltage port. The second DC port is connected to the battery, and the second bus voltage port is connected to the load.

[0008] The first switch module has one end connected to the first AC port and the other end connected to the first AC power supply.

[0009] The second switch module has one end connected to the second AC port and the other end connected to the second AC power supply;

[0010] The third switch module has one end connected to the first bus voltage port and the other end connected to the load;

[0011] A control module, which is connected to the first bidirectional inverter module, the second bidirectional inverter module, the first switch module, the second switch module, and the third switch module respectively, is used to control the first switch module, the second switch module, and the third switch module according to the battery's power and the load's power requirements, so that the first bidirectional inverter module charges the battery or discharges the load, and the second bidirectional inverter module charges the battery or discharges the load.

[0012] Optionally, when the battery charge is lower than a first preset value and the load has no power requirement, the control module controls the first switch module to turn on, the second switch module to turn on, and the third switch module to turn off, so that the first bidirectional inverter module and the second bidirectional inverter module simultaneously charge the battery.

[0013] Optionally, when the battery charge is higher than a second preset value and the load has a power requirement, the control module controls the first switch module to disconnect, the second switch module to disconnect, and the third switch module to turn on, so that the first bidirectional inverter module and the second bidirectional inverter module simultaneously discharge the load.

[0014] Optionally, the control module controls the first bidirectional inverter module and the second bidirectional inverter module to supply power to the load according to a preset power ratio.

[0015] Optionally, the control module dynamically adjusts the power output ratio of the first bidirectional inverter module and the second bidirectional inverter module to the load based on the battery charge, the power demand of the load, and the operating status of the first bidirectional inverter module and the second bidirectional inverter module, so that the first bidirectional inverter module and the second bidirectional inverter module supply power to the load according to the adjusted power ratio.

[0016] Optionally, the control module is further configured to control the third switch module to turn on when the frequency and phase of the AC voltage output by the first bidirectional inverter module and the second bidirectional inverter module are consistent, so that the first bidirectional inverter module and the second bidirectional inverter module simultaneously discharge the load.

[0017] Optionally, when the battery charge is lower than a first preset value and the load has a power requirement, the control module controls the first switch module to turn on, the second switch module to turn on, and the third switch module to turn off, so that the first bidirectional inverter module charges the battery and the second bidirectional inverter module discharges the load.

[0018] Optionally, the control module is further configured to control the first bidirectional inverter module and the second bidirectional inverter module to discharge different loads respectively according to the type of load, and to control the working state of the first bidirectional inverter module and the second bidirectional inverter module according to the battery charge.

[0019] A second aspect of this invention provides a control method for a dual-inverter module power supply device based on the first aspect, the control method comprising:

[0020] The first switch module, the second switch module, and the third switch module are controlled according to the battery's charge level and the load's power requirements, so that the first bidirectional inverter module can charge the battery or discharge the load, and the second bidirectional inverter module can charge the battery or discharge the load.

[0021] A third aspect of the present invention provides a refrigeration system, including the dual inverter module power supply device described in the first aspect.

[0022] The technical effects of this invention are as follows: This technical solution achieves dynamic separation and intelligent switching of charging and discharging functions through the coordinated control of the first bidirectional inverter module and the second bidirectional inverter module. It can flexibly schedule the working state of the two inverter modules according to the battery capacity and the power demand of the load, effectively avoiding the conflicts and limitations of traditional single inverter modules when balancing power supply and charging. This technical solution not only improves the system's operational stability and power utilization efficiency, but also has good redundancy and scenario adaptability, making it particularly suitable for energy storage power supply systems with multi-tasking and high reliability requirements. Attached Figure Description

[0023] To more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings used in the description of the embodiments of the present invention will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0024] Figure 1 This is a schematic diagram of the structure of a dual inverter module power supply device provided in Embodiment 1 of the present invention;

[0025] Figure 2 This is a circuit diagram of a dual inverter module power supply device provided in Embodiment 1 of the present invention;

[0026] In the diagram: 101, Battery; 102, First bidirectional inverter module; 103, Second bidirectional inverter module; 104, First switch module; 105, First AC power supply; 106, Second switch module; 107, Second AC power supply; 108, Third switch module; 109, Load; 110, Control module. Detailed Implementation

[0027] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0028] It should be understood that the invention can be embodied in various forms and should not be construed as being limited to the embodiments set forth herein. Rather, providing these embodiments will make the disclosure thorough and complete, and will fully convey the scope of the invention to those skilled in the art. In the drawings, for clarity, the dimensions and relative dimensions of layers and regions may be exaggerated. The same reference numerals denote the same elements throughout.

[0029] It should be understood that when an element or layer is referred to as "on," "adjacent to," "connected to," or "coupled to" other elements or layers, it may be directly on, adjacent to, connected to, or coupled to other elements or layers, or there may be intervening elements or layers. Conversely, when an element is referred to as "directly on," "directly adjacent to," "directly connected to," or "directly coupled to" other elements or layers, there are no intervening elements or layers. It should be understood that although the terms first, second, third, etc., may be used to describe various elements, components, areas, layers, and / or portions, these elements, components, areas, layers, and / or portions should not be limited by these terms. These terms are only used to distinguish one element, component, area, layer, or portion from another element, component, area, layer, or portion. Therefore, without departing from the teachings of this invention, the first element, component, area, layer, or portion discussed below may be referred to as the second element, component, area, layer, or portion.

[0030] The terminology used herein is for the purpose of describing particular embodiments only and is not intended to limit the invention. When used herein, the singular forms “a,” “an,” and “the” are also intended to include the plural forms unless the context clearly indicates otherwise. It should also be understood that the terms “comprising” and / or “including,” when used in this specification, identify the presence of the stated features, integers, steps, operations, elements, and / or components, but do not exclude the presence or addition of one or more other features, integers, steps, operations, elements, components, and / or groups. When used herein, the term “and / or” includes any and all combinations of the associated listed items.

[0031] To fully understand this invention, detailed structures and steps will be presented in the following description to illustrate the technical solution proposed by this invention. Preferred embodiments of the invention are described in detail below; however, in addition to these detailed descriptions, the invention may have other embodiments.

[0032] Example 1

[0033] This embodiment provides a dual inverter module power supply device, such as... Figure 1 As shown, it includes:

[0034] Battery 101;

[0035] The first bidirectional inverter module 102 includes a first DC port, a first AC port and a first bus voltage port, and the first DC port is connected to the battery 101.

[0036] The second bidirectional inverter module 103 includes a second DC port, a second AC port and a second bus voltage port. The second DC port is connected to the battery 101 and the second bus voltage port is connected to the load 109.

[0037] The first switch module 104 has one end connected to the first AC port and the other end connected to the first AC power supply 105;

[0038] The second switch module 106 has one end connected to the second AC port and the other end connected to the second AC power supply 107;

[0039] The third switch module 108 is connected at one end to the first bus voltage port and at the other end to the load 109;

[0040] The control module 110 is connected to the first bidirectional inverter module 102, the second bidirectional inverter module 103, the first switch module 104, the second switch module 106, and the third switch module 108, respectively. It is used to control the first switch module 104, the second switch module 106, and the third switch module 108 according to the battery 101's power level and the load 109's power requirements, so that the first bidirectional inverter module 102 charges the battery 101 or discharges the load 109, and the second bidirectional inverter module 103 charges the battery 101 or discharges the load 109.

[0041] The battery 101 stores electrical energy, providing DC voltage to the inverter module in discharge mode and receiving rectified electrical energy from the inverter module for charging in charging mode. The first DC port of the first bidirectional inverter module 102 is connected to the battery 101 for energy exchange; its first AC port can be connected to the first AC power supply 105, and its first bus voltage port is connected to the load 109. This enables bidirectional energy conversion: in charging mode, it rectifies the AC power input from the first AC power supply 105 into DC power to charge the battery 101; in discharge mode, it inverts the DC power provided by the battery 101 into AC power to supply power to the load 109. The second DC port of the second bidirectional inverter module 103 is connected to the load 109 to meet the power requirements of the load 109 through inverter output; its second AC port is connected to the second AC power supply 107. The second bidirectional inverter module 103 inverts the electrical energy from the battery 101 into AC power to supply power to the load 109; it can also rectify the AC input into DC power to charge the battery 101. The first switch module 104 controls the connection and disconnection between the first AC power supply 105 and the first bidirectional inverter module 102, and is used to control whether the first bidirectional inverter module 102 is connected to the power grid to charge the battery 101. The second switch module 106 controls the connection and disconnection between the second AC power supply 107 and the second bidirectional inverter module 103, and is used to control whether the second bidirectional inverter module 103 is connected to the power grid to charge the battery 101. The third switch module 108 controls whether the first bidirectional inverter module 102 supplies power to the load 109, and is used to enable the system to supply power to the load 109 from the battery 101 in the event of a mains power outage or in a specific scenario. The control module 110 is connected to the above two sets of inverter modules and the three switch modules; its main functions include: real-time acquisition of the battery 101's power information and the load 109's power demand; dynamic determination of the current required operating mode (charging, discharging, or hybrid operating mode) based on the system status; control of the on / off states of the first switch module 104, the second switch module 106, and the third switch module 108 to achieve coordinated scheduling among the inverter modules; and ensuring the stability of the system power supply.

[0042] The technical advantage of the solution provided in this embodiment is that, compared with traditional energy storage systems using a single inverter module structure, this solution significantly improves the flexibility and reliability of the system in terms of charge and discharge coordination by introducing a collaborative control architecture between the first and second bidirectional inverter modules. The control module intelligently controls the conduction state of each switching module according to the battery's capacity and the load's power requirements, enabling the two inverter modules to perform charging and discharging tasks separately or simultaneously, effectively solving the problem that a single inverter module system cannot simultaneously meet charging and discharging demands. Specifically: In scenarios where the battery charge is low but the load requires power, one inverter module can charge the battery while the other discharges the load, preventing system power loss. When the battery is fully charged and the load power is high, two inverter modules can be connected in parallel to supply power to the load, achieving power sharing and improving power supply capacity and operating efficiency. When the load is idle, the two inverter modules can charge the battery together or alternately, increasing the charging rate. Redundant control paths are provided, allowing switching to single inverter module operation in case of inverter module or power supply failure, enhancing fault tolerance and system stability. The control module manages the first and second bus voltage ports, enabling flexible switching of power supply paths and bus connections, supporting complex application scenarios such as refrigerated trucks, residential energy storage, and distributed grids. This technical solution not only improves the system's operational flexibility and energy dispatch capabilities but also significantly enhances the system's adaptability to sudden states and multi-task demands, demonstrating high engineering practical value and promising prospects for widespread application.

[0043] In one implementation, when the battery 101's charge is lower than a first preset value and the load 109 has no power requirement, the control module 110 controls the first switch module 104 to turn on, the second switch module 106 to turn on, and the third switch module 108 to turn off, so that the first bidirectional inverter module 102 and the second bidirectional inverter module 103 simultaneously charge the battery 101.

[0044] During the operation of the energy storage system, when the battery 101's charge level falls below a set threshold (i.e., it is in a low-charge state), the system needs to charge the battery 101 promptly to avoid affecting the stability of subsequent power supply due to excessively low charge. Simultaneously, if the load 109 is not running or is in a low-power standby state (i.e., has no power demand), the system can use all available resources to charge the battery 101, thereby improving charging efficiency and energy utilization. The control module 110 in this technical solution controls the operation of the switching modules according to the current system state, turning on the first switching module 104 and the second switching module 106 to connect the first AC power supply 105 and the second AC power supply 107 respectively, while simultaneously disconnecting the third switching module 108 to prevent the inverter module from outputting to the load 109. At this time, the first bidirectional inverter module 102 and the second bidirectional inverter module 103 respectively input electrical energy from their corresponding AC power supplies, rectify it, and charge the battery 101. This process not only speeds up the charging process but also achieves load balancing among the inverter modules, improving system stability.

[0045] The technical advantages of this implementation are as follows: by setting up two inverter modules to obtain energy from their respective AC power sources and rectify it into DC power for output to battery 101, the charging power can be effectively improved and the charging time shortened, making it suitable for applications requiring rapid recharging of battery 101. Simultaneously, since load 109 is not operating at this time, the overall energy utilization efficiency of the system is higher.

[0046] In one implementation, when the battery 101 has a higher charge than the second preset value and the load 109 has a power requirement, the control module 110 controls the first switch module 104 to open, the second switch module 106 to open, and the third switch module 108 to open, so that the first bidirectional inverter module 102 and the second bidirectional inverter module 103 simultaneously discharge the load 109.

[0047] In this mode, when the battery 101's charge level is detected to be higher than the second preset threshold (i.e., the battery 101 is fully charged) and the load 109 has a power demand, the battery 101 should be prioritized as the energy source to power the load 109. This operating mode can complete the power supply task without relying on an external AC power source, making it suitable for off-grid scenarios or peak electricity price periods. The control module 110 disconnects the first switch module 104 and the second switch module 106 to prevent AC grid intervention; it connects the third switch module 108 to allow the inverter module output to connect to the load 109; and it controls the first bidirectional inverter module 102 and the second bidirectional inverter module 103 to simultaneously obtain DC power from the battery 101, invert it into DC power, and output it to the load 109 to achieve the power supply function. In this mode, the two inverter modules can be connected in parallel or supplied separately, thereby sharing the load power, preventing one inverter module from overloading, and improving the system's stability and service life.

[0048] The technical advantages of this implementation are as follows: In this working mode, the two inverter modules work together, dynamically adjusting according to a preset power distribution strategy or real-time load changes to ensure stable power supply to load 109. Simultaneously, it completely eliminates reliance on external power sources, enhancing the system's independent off-grid operation capability, making it particularly suitable for applications such as integrated photovoltaic and energy storage systems, cold chain transportation, and emergency power supplies.

[0049] In one implementation, the control module 110 controls the first bidirectional inverter module 102 and the second bidirectional inverter module 103 to supply power to the load 109 according to a preset power ratio.

[0050] In practical applications, the load power may be large or fluctuate. To prevent overheating and overload caused by prolonged high-load operation of a single inverter module, and to improve system redundancy and reliability, this device is designed with a function to supply power according to a preset power ratio. The control module 110 can distribute the total load power to the first bidirectional inverter module 102 and the second bidirectional inverter module 103 according to the optimal ratio (e.g., 1:1, 2:1, etc.) learned during system operation or the factory configuration. In this way, power sharing is achieved, reducing the pressure on a single inverter module; on the other hand, it facilitates system expansion and management, allowing different inverter modules to participate in power supply according to their capacity characteristics, which helps optimize system operation and fault tolerance. For example, the power supply ratio between the first bidirectional inverter module 102 and the second bidirectional inverter module 103 can be set to 1:1, meaning that when the load power is 6000W, each inverter module outputs approximately 3000W; or the ratio can be set to 2:1, indicating that the first bidirectional inverter module 102 outputs 4000W and the second bidirectional inverter module 103 outputs 2000W. The control module 110 can achieve precise allocation by adjusting the PWM control parameters, current setting values, or output power reference values ​​of the inverter modules. When the load 109 experiences a sudden change or a certain inverter module malfunctions, the control module 110 can also dynamically adjust this ratio, such as temporarily switching from dual-machine power supply to single-machine mode or changing from an equal-ratio strategy to a non-equal-ratio strategy, to ensure uninterrupted power supply to the load 109.

[0051] The technical advantages of this embodiment are as follows: By coordinating the power supply from the first bidirectional inverter module 102 and the second bidirectional inverter module 103 to the load 109 according to a preset power ratio, the control module 110 can effectively achieve balanced power distribution among multiple inverter modules, avoiding overheating and overload problems caused by prolonged high-load operation of a single inverter module, thus improving the stability and reliability of the system. Furthermore, by flexibly setting the power supply ratio according to the capacity configuration of different inverter modules, overall energy efficiency can be optimized, equipment lifespan extended, and the system's adaptability to different operating conditions improved. This technical solution possesses good scalability and fault tolerance, and is suitable for various energy storage power supply systems where multiple inverter modules work collaboratively.

[0052] In one implementation, the control module 110 dynamically adjusts the power ratio of the first bidirectional inverter module 102 and the second bidirectional inverter module 103 to the load 109 based on the battery 101's charge, the load 109's power demand, and the operating status of the first bidirectional inverter module 102 and the second bidirectional inverter module 103, so that the first bidirectional inverter module 102 and the second bidirectional inverter module 103 supply power to the load 109 according to the adjusted power ratio.

[0053] In a further embodiment of the present invention, the control module 110 not only determines the working mode based on the battery 101's charge and the load's power requirements, but also has a dynamic power allocation function, which is used to automatically adjust the output ratio of the two inverter modules in the discharge power supply mode.

[0054] Specifically, the control module 110 includes:

[0055] The battery monitoring unit is used to detect the current charge (SOC) and state of health (SOH) of battery 101.

[0056] The load monitoring unit collects load power fluctuations in real time.

[0057] The inverter module status acquisition unit acquires operating status parameters such as temperature and current load rate for each inverter module.

[0058] The proportional adjustment unit calculates the target output ratio based on the above parameters.

[0059] During operation, if the control module 110 determines that the current power supply mode is discharge mode and both inverter modules are in normal operation, the power ratio will be dynamically adjusted according to the following logic: if the temperature rise of one inverter module is high or the load rate is too high (exceeding the preset value), the output ratio of that inverter module will be reduced and the output of the other inverter module will be increased; if one inverter module is a backup inverter module or has low power capacity, its maximum output power limit will be configured; if the load 109 fluctuates frequently, a sliding average mechanism will be used to stabilize the output ratio change and avoid grid disturbance caused by frequent adjustments.

[0060] For example, when the system detects that the battery 101 has 80% of its maximum capacity and the load 109 is 6000W, the first bidirectional inverter module 102 is in normal condition, and the second bidirectional inverter module 103 has an excessively high temperature, the control module 110 automatically adjusts the power distribution so that the first bidirectional inverter module 102 outputs 4000W and the second bidirectional inverter module 103 outputs 2000W. If the temperature and current of both inverter modules are normal, they output 3000W each in a 1:1 ratio. The control module 110 re-evaluates the system status every 100ms and smoothly adjusts the ratio to ensure that the voltage fluctuation on the load 109 side is within ±2%.

[0061] The technical advantages of this embodiment are as follows: By dynamically adjusting the output power ratio between the first bidirectional inverter module 102 and the second bidirectional inverter module 103 through the control module 110, intelligent power sharing among the inverter modules is achieved, avoiding overheating and aging problems caused by long-term full-load operation of a single device. This also improves the overall energy efficiency and operational stability of the system. This strategy can optimize output distribution in real time based on the battery 101's charge status, the inverter module's operating status, and load 109 fluctuations, exhibiting good adaptability and anti-interference capabilities. It is particularly suitable for energy storage power supply systems with multiple inverter modules operating collaboratively.

[0062] In one implementation, the control module 110 is also used to control the third switch module 108 to turn on when the frequency and phase of the AC voltage output by the first bidirectional inverter module 102 and the second bidirectional inverter module 103 are consistent, so that the first bidirectional inverter module 102 and the second bidirectional inverter module 103 simultaneously discharge the load 109.

[0063] In a further embodiment of the present invention, the dual inverter module power supply device has soft-start and parallel synchronous control functions to solve the problems of voltage surges, current surges, or system instability that may occur when the dual inverter modules are operating in parallel or dynamically switching. When it is detected that a switch to the dual inverter module parallel power supply mode is required (e.g., increased load power, sufficient battery power, grid power failure, etc.), the control module 110 executes the following process:

[0064] 1. The control module 110 first activates the first bidirectional inverter module 102 and outputs the rated voltage; then it controls the second bidirectional inverter module 102 to enter the soft start mode, and its output voltage gradually increases from 0 (e.g., 0V→20V→…→220V). The increase time can be set to 50ms~500ms to prevent instantaneous grid connection impact.

[0065] 2. During the voltage ramp-up process of the second bidirectional inverter module 103, the control module 110 collects the output waveform (voltage / current) of the first bidirectional inverter module 102 as a reference; through a phase-locked loop (PLL) or digital synchronization control algorithm, the frequency and phase of the AC voltage output by the second bidirectional inverter module 103 are adjusted to be consistent with those of the first bidirectional inverter module 102; once the frequency deviation is <0.1Hz and the phase error is <3°, synchronization is considered successful.

[0066] 3. The control module 110 controls the synchronous relay or power MOSFET to turn on, so that the second bidirectional inverter module 103 is officially connected in parallel to the load 109; the two inverter modules jointly supply power to the load 109 and dynamically share the load 109 according to the power distribution strategy.

[0067] 4. If an abnormality is detected during soft start or phase synchronization (such as excessive voltage fluctuation, frequency drift, output abnormality, etc.), the synchronization process can be stopped, the single inverter module can be kept running, and an alarm message can be issued to ensure power supply stability.

[0068] The technical advantages of this implementation are: by using soft start and phase synchronization control, it ensures a smooth parallel switching process for dual inverter modules, significantly reduces voltage jumps and parallel inrush currents, and effectively improves system stability and equipment reliability. It is particularly suitable for scenarios involving high-power loads, off-grid switching, and multi-inverter module collaborative power supply.

[0069] In one implementation, when the battery 101's charge is lower than a first preset value and the load 109 has a power requirement, the control module 110 controls the first switch module 104 to turn on, the second switch module 106 to turn on, and the third switch module 108 to turn off, so that the first bidirectional inverter module 102 charges the battery 101 and the second bidirectional inverter module 103 discharges the load 109.

[0070] When the battery 101's charge level is detected to be below a first preset value (i.e., in a low-charge state), and the load 109 has a power requirement, two objectives must be met simultaneously: ensuring the continuous operation of the load 109 without interruption; and promptly charging the battery 101 to prevent system power loss due to excessively low charge. This technical solution designs a dual-inverter module collaborative working mode with separate charging and discharging capabilities. Specifically: the first bidirectional inverter module 102 is connected to the first AC power supply 105, obtaining AC input through the first conducting switch module 104 to charge the battery 101; the second bidirectional inverter module 103 is connected to the DC side of the battery 101, using its inverter capability to convert the residual energy of the battery 101 into AC power to supply power to the load 109; the third switch module 108 is disconnected, preventing the first bidirectional inverter module 102 from directly supplying power to the load 109, thereby achieving physical isolation and logical division of labor between the two inverter modules. In this mode, the two inverter modules can each perform charging and discharging tasks independently without interference, achieving efficient collaborative utilization of energy. Under this operating condition, the tasks of the two inverter modules are clearly defined: the first bidirectional inverter module 102 is responsible for charging, and the second bidirectional inverter module 103 is responsible for discharging. Even if the battery 101 has a low charge, it can ensure that the load 109 maintains normal operation and at the same time replenishes energy as quickly as possible using the mains power resources. This is suitable for the critical state of continuous operation of the load 109 and tight energy storage in actual operating conditions.

[0071] The technical advantages of this embodiment are as follows: By controlling the first bidirectional inverter module 102 and the second bidirectional inverter module 103 to perform charging and discharging tasks respectively, the charging and discharging functions are separated and controlled, ensuring that the load 109 can still be powered normally even when the battery 101 is low on power, effectively improving the system's stability and continuous power supply capability. Simultaneously, AC power is used to replenish the battery 101, preventing over-discharge of the battery 101, extending its service life, and improving the safety and reliability of the entire energy storage system.

[0072] In one implementation, the control module 110 is also used to control the first bidirectional inverter module 102 and the second bidirectional inverter module 103 to discharge different loads according to the type of load 109, and to control the working state of the first bidirectional inverter module 102 and the second bidirectional inverter module 103 according to the power of the battery 101.

[0073] In one extended embodiment of the present invention, the dual inverter module power supply device is further applicable to multi-load branch control scenarios, wherein the loads are divided into different load types or priorities, such as critical loads and non-critical loads, inductive loads and resistive loads, etc., to achieve refined power management and priority power supply scheduling.

[0074] The types of load 109 include: the first load branch, such as communication equipment, cold chain compressors, servers and other critical loads with high requirements for power supply stability; and the second load branch, such as lighting, fans and other interruptible non-critical loads.

[0075] The control module 110 executes the following control logic according to the load configuration file or preset strategy: When operating in discharge mode and the battery 101 has sufficient power, the control module 110 controls the first bidirectional inverter module 102 to supply power to the first load branch; simultaneously, it controls the second bidirectional inverter module 103 to supply power to the second load branch, achieving load balancing and partitioned power supply. When the battery 101's power level drops below a set threshold, the control module 110 can shut down the output path corresponding to the second load branch (e.g., disconnect the corresponding relay); it retains power supply to the first load branch, prioritizing the operation of critical loads. When the battery 101's power level continues to drop to a critical value or the backup power supply fails to connect, the control module 110 switches both inverter modules to supply power to the first load branch, improving the stability of critical systems; it records the power degradation status, generates alarm information, uploads it to the system management platform, or alerts the user. The control module 110 can automatically switch load priorities according to user-defined scenarios (e.g., energy-saving mode, emergency mode); or it can receive remote control commands through an external communication interface to adjust the load strategy.

[0076] The technical advantages of this implementation are as follows: By dividing the load into different branches and supplying power to them separately by the first bidirectional inverter module 102 and the second bidirectional inverter module 103, the control module 110 can dynamically schedule power resources according to load type or priority, achieving refined management. In the event of insufficient or abnormal battery power in the 101, the system can prioritize ensuring continuous power supply to critical loads, automatically shutting down or limiting power to non-critical loads, significantly improving the system's stability, security, and fault tolerance in resource-constrained environments. Simultaneously, this strategy supports remote control and energy-saving optimization, contributing to the construction of an intelligent and highly reliable energy storage power supply system.

[0077] The following describes this embodiment through a specific circuit structure: Figure 2 As shown, the first AC power supply 105 is AC power supply A1, the second AC power supply 107 is AC power supply A2, and the first bidirectional inverter module 102 includes a first MOSFET Q1, a second MOSFET Q2, a third MOSFET Q3, a fourth MOSFET Q4, a transformer T1, a first IGBT module Q5, a second IGBT module Q6, a third IGBT module Q7, and a fourth IGBT module Q8. The drain of the first MOSFET Q1 and the drain of the second MOSFET Q2 are connected together to form the first terminal BAT1+ of the first DC port of the first bidirectional inverter module 102. The source of the third MOSFET Q3 and the source of the fourth MOSFET Q4 are connected together to form the second terminal BAT1- of the first DC port of the first bidirectional inverter module 102. The source of the first MOSFET Q1 and the drain of the third MOSFET Q3 are connected together to the first terminal of the transformer T1, and the source of the second MOSFET Q2 and the drain of the fourth MOSFET Q4 are connected together to the second terminal of the transformer T1. The second terminal of the first IGBT module Q5 and the first terminal of the second IGBT module Q6 are connected together to the third terminal of transformer T1. The second terminal of the third IGBT module Q7 and the first terminal of the fourth IGBT module Q8 are connected together to the fourth terminal of transformer T1. The fourth terminal of transformer T1 is also connected to the first terminal of switch S1. The second terminal of switch S1 is connected to one end of AC power supply A1, and the other end of AC power supply A1 is connected to the third terminal of transformer T1. The first terminal of the first IGBT module Q5 and the first terminal of the third IGBT module Q7 are connected together to form the first terminal of the first bus voltage of the first bidirectional inverter module 102. The first terminal of the first bus voltage is connected to one end of load 109 through switch S3. The second terminals of the second IGBT module Q6 and the second terminal of the fourth IGBT module Q8 are connected together to form the second terminal of the first bus voltage of the first bidirectional inverter module 102. The second terminal of the first bus voltage of the first bidirectional inverter module 102 is connected to the other end of load 109.

[0078] The second bidirectional inverter module 103 includes an eleventh MOSFET Q11, a twelfth MOSFET Q12, a thirteenth MOSFET Q13, a fourteenth MOSFET Q14, a transformer T2, an eleventh IGBT module Q15, a twelfth IGBT module Q16, a thirteenth IGBT module Q17, and a fourteenth IGBT module Q18. The drain of the eleventh MOSFET Q11 and the drain of the twelfth MOSFET Q12 are connected together to form the first terminal BAT2+ of the second DC port of the second bidirectional inverter module 103. The source of the thirteenth MOSFET Q3 and the source of the fourteenth MOSFET Q14 are connected together to form the second terminal BAT2- of the second DC port of the second bidirectional inverter module 103. The source of the eleventh MOSFET Q11 and the drain of the thirteenth MOSFET Q13 are connected together and then connected to the first terminal of the transformer T2. The source of the twelfth MOSFET Q12 and the drain of the fourteenth MOSFET Q14 are connected together and then connected to the second terminal of the transformer T2. The second terminal of the eleventh IGBT module Q15 and the first terminal of the twelfth IGBT module Q16 are connected together and then connected to the fourth terminal of transformer T2. The second terminal of the thirteenth IGBT module Q17 and the first terminal of the fourteenth IGBT module Q18 are connected together and then connected to the third terminal of transformer T2. The third terminal of transformer T2 is also connected to one end of switch S2. The other end of switch S2 is connected to one end of AC power supply A2. The other end of AC power supply A2 is connected to the fourth terminal of transformer T2. The first terminal of the eleventh IGBT module Q15 and the first terminal of the thirteenth IGBT module Q17 are connected together to form the first terminal of the second bus voltage of the second bidirectional inverter module 103. The first terminal of the second bus voltage is connected to the first terminal of load 109. The second terminal of the twelfth IGBT module Q16 and the second terminal of the fourteenth IGBT module Q18 are connected together to form the second terminal of the second bus voltage of the second bidirectional inverter module 103. The second terminal of the second bus voltage is connected to the second terminal of load 109.

[0079] 1. Charging mode: After the control module 110 detects the normal grid voltage, it outputs a drive voltage (low level) to switch S3. Switch S3 is opened, and the control module 110 controls switch S1 to be turned on, so that AC power supply A1 charges battery 101 through the first bidirectional inverter module 102, charging 5000W, and AC power supply A2 supplies power to the load compressor through the second bidirectional inverter module 103, with the compressor cooling 5000W.

[0080] 2. Discharge mode: After the user turns off the power grid, the control module 110 outputs a drive voltage (high level) to switch S3, and switch S3 is turned on. At the same time, the control module 110 controls switches S1 and S2 to be turned off, and the first bidirectional inverter module 102 and the second bidirectional inverter module 103 work in parallel, and the compressor cools 8000W.

[0081] As an extended implementation, the control module 110 further includes a power-temperature coupling control unit, used to dynamically adjust the output power ratio of each inverter module according to the temperature change trend of each inverter module when the first bidirectional inverter module 102 and the second bidirectional inverter module 103 simultaneously supply power to the load 109, so as to achieve thermally balanced operation. Specifically, the control module 110 collects the temperature information (e.g., case temperature, IGBT junction temperature, etc.) of the first bidirectional inverter module 102 and the second bidirectional inverter module 103 respectively, and constructs a power-temperature rise coupling model in combination with the corresponding output power. This model is used to evaluate the temperature rise rate caused by unit power of each inverter module and is updated continuously during operation. When the control module 110 detects that the temperature rise rate of one inverter module is faster than that of another module, or that its temperature is close to a preset threshold (e.g., 80°C), it actively reduces the output power of the first inverter module and appropriately increases the output of the other inverter module, forming a dynamic balance between power and thermal load.

[0082] For example, if the current temperature of the first bidirectional inverter module 102 is 75℃ and its power is 3000W, while the temperature of the second bidirectional inverter module 103 is only 60℃ and its power is 3000W, the control module 110 can adjust the output ratio to 2500W / 3500W to slow down the increase in heat load of the high-temperature inverter module and prevent thermal protection activation. At the same time, the control module 110 supports temperature hysteresis strategies and gradual adjustment mechanisms to avoid system disturbances caused by frequent adjustments.

[0083] The control module 110 collects real-time output power data (such as current and voltage) of the first bidirectional inverter module 102 and the second bidirectional inverter module 103, and calculates the power value. At the same time, it obtains the temperature values ​​of key components (such as IGBTs, MOSFETs, and heat sinks) of each inverter module through a built-in temperature sensor or an external temperature detection module, and constructs the following model:

[0084] △T i (t)= T i (t)-T i0≈ K i× P i (t);

[0085] Where: △T i (t) represents the temperature rise of the i-th inverter module at time t; T i (t) represents the current temperature of the inverter module; T i0 The reference value is the ambient temperature or the module's static temperature; P i (t) represents the current output power of the inverter module; K i This is the power-temperature rise coupling coefficient, reflecting the degree of temperature rise caused by unit power (unit: °C / W).

[0086] The coupling coefficient K iThe values ​​can be obtained through initial calibration or self-learning during operation, exhibiting a certain degree of time stability. If the inverter module runs for an extended period, its values ​​can be updated using a moving average.

[0087] When a certain inverter module K i A sharp rise indicates a decline in thermal management performance (such as poor heat dissipation or aging), which can trigger a system warning and limit its maximum output power. Control module 110 determines whether to reduce output power based on the current power and predicted temperature rise. For example, if the upper limit for temperature rise is set to 30°C, power reduction or output switching will be performed in advance when the predicted temperature rise exceeds this limit. By comparing the K1 and K2 values ​​of the two inverter modules, output power is preferentially allocated to the inverter module with lower temperature rise sensitivity, achieving thermal balance control.

[0088] The technical advantages of this implementation are as follows: by introducing a temperature sensing and coupling control mechanism, dynamic balance of heat load between inverter modules is achieved, effectively avoiding device aging or failure caused by long-term high-temperature operation of a single module, significantly improving system operation safety, equipment lifespan and stability under high load, and is especially suitable for continuous high-power operation scenarios such as cold chain compressors.

[0089] As another extended implementation, the control module 110 further evaluates the power supply capability of the inverter module, and uses information such as battery status, module efficiency and current load rate to dynamically control the first bidirectional inverter module 102 and the second bidirectional inverter module 103, and thereby implements a better power distribution strategy.

[0090] Specifically, the control module 110 periodically collects the following information: 1) the current SOC (State of Charge) of the battery 101, reflecting its remaining capacity; 2) the current conversion efficiency of the inverter modules, used to assess unit energy conversion loss; and 3) the proportion of the current output power of each inverter module to its rated capacity. Based on the above data, the control module calculates the power supply capacity score of each inverter module using the following formula:

[0091] S i =W 1× SOC i +W2×β i +W3×(1 -P i / P MAX )

[0092] Among them, SOC i The state of charge (SOC) of the battery connected to this module represents the amount of remaining energy; β i This represents the current inverter efficiency (input / output power ratio); a higher ratio indicates lower losses. i / P MAXThis represents the current output load rate and occupancy level; W1, W2, and W3 are the weighting coefficients for each indicator, which can be flexibly set according to the application scenario (e.g., more emphasis is placed on high reliability scenarios, and more emphasis is placed on cold chain scenarios); 1 -P i / P MAX This represents idle capacity; the lower the load, the higher the score, indicating that more output can be handled.

[0093] The control module 110 calculates the target output power allocation ratio based on the rating ratio of the two inverter modules, and smoothly adjusts the PWM duty cycle or power setting reference value to achieve dynamic tracking control. For example, if the first bidirectional inverter module 102 scores 70 and the second bidirectional inverter module 103 scores 30, the target allocation ratio is 7:3, with the first bidirectional inverter module 102 bearing 70% and the second bidirectional inverter module 103 bearing 30% of the power of the load 109, respectively.

[0094] The technical advantages of this implementation method are as follows: Compared with the traditional method of allocating power according to a fixed ratio or only based on the current load rate, this solution constructs the module power supply capability through multi-dimensional state variables, realizes intelligent and global optimized scheduling of power resources, and is particularly suitable for energy storage systems with asymmetrical module performance and different battery pack SOH states, thereby improving the system's energy efficiency and operational stability.

[0095] Example 2

[0096] This second embodiment provides a control method for the dual inverter module power supply device provided in the first embodiment, applied to a control module. The control method includes:

[0097] The first, second, and third switching modules are controlled according to the battery's charge level and the load's power requirements, so that the first bidirectional inverter module can charge the battery or discharge the load, and the second bidirectional inverter module can charge the battery or discharge the load.

[0098] The control methods specifically include:

[0099] When the battery charge is lower than a preset value and the load has no power requirement, the first switch module is turned on, the second switch module is turned on, and the third switch module is turned off, so that the first bidirectional inverter module and the second bidirectional inverter module can charge the battery simultaneously.

[0100] When the battery charge is not lower than the preset value and the load has a power requirement, the first switch module is turned off, the second switch module is turned off, and the third switch module is turned on, so that the first bidirectional inverter module and the second bidirectional inverter module discharge the load simultaneously.

[0101] When the frequency and phase of the AC voltage output by the first bidirectional inverter module and the second bidirectional inverter module are consistent, the third switch module is controlled to turn on so that the first bidirectional inverter module and the second bidirectional inverter module discharge the load simultaneously.

[0102] When the battery charge is lower than a preset value and the load has a power requirement, the first switch module is turned on, the second switch module is turned on, and the third switch module is turned off, so that the first bidirectional inverter module charges the battery and the second bidirectional inverter module discharges the load.

[0103] Controlling the first and second bidirectional inverter modules to simultaneously discharge the load includes:

[0104] The first and second bidirectional inverter modules are controlled to supply power to the load according to a preset power ratio.

[0105] Controlling the first bidirectional inverter module and the second bidirectional inverter module to simultaneously discharge the load also includes:

[0106] Based on the current battery charge, the power demand of the load, and the operating status of the first and second bidirectional inverter modules, the power output ratio of the first and second bidirectional inverter modules to the load is dynamically adjusted so that the first and second bidirectional inverter modules supply power to the load according to the adjusted power ratio.

[0107] Example 3

[0108] This embodiment three provides a refrigeration system, including the dual inverter module power supply device provided in embodiment one.

[0109] The above embodiments are only used to illustrate the technical solutions of the present invention, and are not intended to limit it. Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of the present invention, and should all be included within the protection scope of the present invention.

Claims

1. A dual-inverter module power supply device characterized by comprising: The application relates to a power supply system, which comprises the following components: a battery; a first bidirectional inverter module, which comprises a first direct current port, a first alternating current port and a first bus voltage port, and the first direct current port is connected to the battery; a second bidirectional inverter module, which comprises a second direct current port, a second alternating current port and a second bus voltage port, and the second direct current port is connected to the battery, and the second bus voltage port is connected to a load; a first switch module, one end of which is connected to the first alternating current port, and the other end of which is connected to a first alternating current power supply; a second switch module, one end of which is connected to the second alternating current port, and the other end of which is connected to a second alternating current power supply; a third switch module, one end of which is connected to the first bus voltage port, and the other end of which is connected to the load; a control module, which is connected to the first bidirectional inverter module, the second bidirectional inverter module, the first switch module, the second switch module and the third switch module respectively, and is used for controlling the first switch module, the second switch module and the third switch module according to the power of the battery and the power demand of the load, so that the first bidirectional inverter module charges the battery or discharges the load, and the second bidirectional inverter module charges the battery or discharges the load; when the power of the battery is higher than a second preset value and the load has a power demand, the control module controls the first switch module to be disconnected, the second switch module to be disconnected and the third switch module to be turned on, so that the first bidirectional inverter module and the second bidirectional inverter module simultaneously discharge the load; the control module is further used for controlling the first bidirectional inverter module and the second bidirectional inverter module to discharge different loads respectively according to the types of the loads, and controlling the working states of the first bidirectional inverter module and the second bidirectional inverter module according to the power of the battery; when operating in a discharging mode and the power of the battery is sufficient, the control module controls the first bidirectional inverter module to supply power to a first load branch; meanwhile, the control module controls the second bidirectional inverter module to supply power to a second load branch, so that the load is balanced and supplied in a partition mode; when detecting that the power of the battery decreases to below a set threshold value, the control module closes an output path corresponding to the second load branch, and keeps the first load branch supplied; when the power of the battery continues to decrease to a critical value or a backup power supply fails to be connected, the control module controls both the first bidirectional inverter module and the second bidirectional inverter module to supply power to the first load branch, records a power degradation state, and generates an alarm information to upload a system management platform or remind a user.

2. The dual-inverter modular power supply of claim 1, wherein, when the power of the battery is lower than a first preset value and the load has no power demand, the control module controls the first switch module to be turned on, the second switch module to be turned on and the third switch module to be disconnected, so that the first bidirectional inverter module and the second bidirectional inverter module simultaneously charge the battery.

3. The dual-inverter modular power supply of claim 1, wherein, the control module controls the first bidirectional inverter module and the second bidirectional inverter module to supply power to the load according to a preset power ratio.

4. The dual-inverter modular power supply of claim 1, wherein, The control module dynamically adjusts a power ratio of the first bidirectional inversion module and the second bidirectional inversion module output to the load according to the power of the battery, the power demand of the load and the working state of the first bidirectional inversion module and the second bidirectional inversion module, so that the first bidirectional inversion module and the second bidirectional inversion module supply power to the load according to the adjusted power ratio.

5. The dual-inverter modular power supply of claim 1, wherein, The control module is further configured to control the third switch module to be turned on when the frequency and phase of the alternating voltage output by the first bidirectional inversion module and the second bidirectional inversion module are consistent, so that the first bidirectional inversion module and the second bidirectional inversion module simultaneously discharge the load.

6. The dual-inverter modular power supply of claim 1, wherein, When the power of the battery is lower than a first preset value and the load has a power demand, the control module controls the first switch module to be turned on, the second switch module to be turned on and the third switch module to be turned off, so that the first bidirectional inversion module charges the battery and the second bidirectional inversion module discharges the load.

7. The dual-inverter modular power supply of claim 1, wherein, The control module is further configured to control the first bidirectional inversion module and the second bidirectional inversion module to discharge different loads according to the type of the load, and control the working state of the first bidirectional inversion module and the second bidirectional inversion module according to the power of the battery.

8. A control method of a dual-inverter module-based power supply device according to claim 1, characterized by, The control method comprises: controlling the first switch module, the second switch module and the third switch module according to the power of the battery and the power demand of the load, so that the first bidirectional inversion module charges the battery or discharges the load, and the second bidirectional inversion module charges the battery or discharges the load.

9. A refrigeration system characterized by, The dual-inversion module power supply device comprises the dual-inversion module power supply device according to any one of claims 1 to 7.

Images