A double bidirectional power supply series energy-saving aging test system and control method

Abstract

The application discloses a double bidirectional power supply series energy-saving aging test system and a control method. The system comprises a commercial power intelligent aging cabinet with an AC power supply output end; a first bidirectional charger with an AC input end and a DC output end; the AC input end is electrically connected with the AC power supply output end; a second bidirectional charger with a DC input end and an AC output end; the DC input end is electrically connected with the DC output end to form a DC series bus; an AC electronic load which is electrically connected with the AC output end and the commercial power intelligent aging cabinet respectively; a DC bidirectional electronic load with a DC terminal and an AC terminal; the DC terminal is connected in parallel with the DC series bus, and the AC terminal is electrically connected with the AC electronic load; the method is applied to the double bidirectional power supply series energy-saving aging test system. The application can effectively avoid the shutdown error caused by voltage abnormality, and provides a steady-state operation condition for long-time uninterrupted network aging.

Description

Technical Field

[0001] This invention relates to the field of power supply aging test technology, and more specifically, to a dual bidirectional power supply series energy-saving aging test system and control method. Background Technology

[0002] Bidirectional AC / DC chargers, energy storage V2G charging modules, and on-board bidirectional chargers are power electronic devices used in new energy storage systems and V2G interaction scenarios for electric vehicles. In practical engineering applications, these bidirectional power devices often adopt a multi-unit series network operation mode, achieving high-power, high-voltage power interaction and energy storage dispatch through multi-device series voltage division and coordinated charging and discharging. Currently, the industry's mass production aging test solutions for bidirectional power supply equipment are mainly divided into two categories: pure resistive load aging and single-unit energy feedback aging. Among them, the traditional resistive load aging solution has extremely serious energy waste and very poor testing economy. This solution consumes all the electrical energy output by the power supply under test as heat energy through the resistor. Under the condition of large-scale and long-term continuous aging test, huge energy loss will be generated, and the electricity cost of mass production test is high. At the same time, the concentrated release of a large amount of heat energy will significantly increase the pressure on factory temperature control and heat dissipation, requiring the matching of high-power heat dissipation equipment, further increasing equipment investment and operation and maintenance costs. The existing single-unit energy feedback aging solution only conducts independent aging tests on a single bidirectional power supply device, which can only simulate the independent operation of a single machine. It cannot reproduce the real working characteristics such as uneven voltage distribution, power coupling disturbance, and dynamic load interaction when multiple machines are connected in series in actual engineering. The aging test conditions deviate greatly from the actual application scenario, and cannot effectively expose the potential defects of the equipment under the condition of series networking, resulting in insufficient effectiveness of aging test.

[0003] In addition, the industry also includes a crude testing method that directly connects two bidirectional chargers in DC series for aging. Due to the discrete hardware parameters of the two bidirectional power supply products under test, an inherent voltage difference will be generated on the output side of the two devices when they are connected in DC series. This will form a continuous internal circulating current in the series circuit, which can easily trigger the overvoltage and overcurrent protection mechanisms of the devices, causing frequent test shutdowns and error interruptions. It is impossible to achieve 24 / 7 uninterrupted long-term continuous aging, resulting in serious circulating current interference and test interruption problems. Summary of the Invention

[0004] To address the shortcomings of existing technologies, this invention provides a dual bidirectional power supply series-connected energy-saving aging test system, comprising: The mains-powered intelligent aging cabinet has an AC power output terminal; The first bidirectional charger has an AC input terminal and a DC output terminal; the AC input terminal is electrically connected to the AC power output terminal. The second bidirectional charger has a DC input terminal and an AC output terminal; the DC input terminal and the DC output terminal are electrically connected to form a DC series bus. An AC electronic load is electrically connected to both the AC output terminal and the mains-powered intelligent aging cabinet. A DC bidirectional electronic load has both DC and AC terminals; the DC terminals are connected in parallel to the DC series bus, and the AC terminals are electrically connected to the AC electronic load. The mains-powered intelligent aging cabinet also includes a built-in grid-connected inverter module and a central controller. The grid-connected inverter module is electrically connected to the AC electronic load, and the central controller establishes communication connections with the first bidirectional charger, the second bidirectional charger, the AC electronic load, and the DC bidirectional electronic load. The central controller controls the first and second bidirectional chargers to automatically switch between charging aging mode and discharging aging mode. In charging aging mode, the central controller controls the AC power output terminal to output AC power, which is transmitted to the first bidirectional charger via the AC input terminal. The first bidirectional charger rectifies the received AC power and converts it into DC power, which is then transmitted to the DC input terminal via the DC output terminal. The DC power is transmitted to the second bidirectional charger via the DC input terminal. The second bidirectional charger uses the received DC power for charging and aging. In the discharge aging mode, the first and second bidirectional chargers are switched to inverter mode, so that the electrical energy on the DC series bus can be internally circulated between the first and second bidirectional chargers. The second bidirectional charger inverts the received DC power into AC power and transmits it to the AC electronic load via the AC output terminal to simulate the consumption of electrical energy. The excess electrical energy that cannot be completely consumed flows partly to the DC bidirectional electronic load via the AC terminal for replenishment, and the other part flows to the grid-connected inverter module for inversion and then fed back to the mains intelligent aging cabinet.

[0005] Furthermore, the present invention also provides a dual-power series-connected energy-saving aging test control method, which is applied to the dual-power series-connected energy-saving aging test system described above, and includes the following steps: Step S01: The system is powered on and initialized. The central controller reads the rated parameters of the first and second bidirectional chargers and sets the target charging and discharging voltage, target charging and discharging current, and charging duration per cycle. Discharge duration during a single operation Total number of loops and differential pressure safety threshold ; Step S02: The central controller controls the first and second bidirectional chargers to be in charging aging mode, and controls the AC power output terminal to output AC power. The AC power is transmitted from the AC power output terminal to the AC input terminal, and then to the first bidirectional charger. The first bidirectional charger rectifies the received AC power into DC power, and transmits it from the DC output terminal along the DC series bus to the DC input terminal, and then to the second bidirectional charger. The second bidirectional charger performs charging aging on the received DC power, so that the first and second bidirectional chargers enter the charging aging condition simultaneously. Under the charging aging condition, the DC bidirectional electronic load continuously monitors the real-time voltage value. and based on Compared with the preset benchmark value The deviation amount dynamically feeds in electrical energy to maintain This eliminates the circulating current in the DC series bus circuit; Step S03: The central controller times and obtains the charging aging duration. When the charging aging duration reaches the duration of a single charging cycle... When the central controller determines that the operating condition switching conditions are met, it immediately issues a switching command to control the first bidirectional charger and the second bidirectional charger to switch to discharge aging mode simultaneously. Step S04: After entering the discharge aging mode, the central controller controls the first and second bidirectional chargers to switch to inverter mode, enabling the electrical energy on the DC series bus to circulate internally between the first and second bidirectional chargers. Then, the second bidirectional charger inverts the received DC power into AC power, which is transmitted to the AC electronic load via the AC output terminal to simulate energy consumption. Simultaneously, the DC bidirectional electronic load continuously performs the voltage dynamic balancing operation in step S02 to ensure the real-time voltage value... Always satisfied Excess electrical energy that cannot be fully consumed by the AC electronic load flows partly to the DC bidirectional electronic load through the AC terminal for replenishment, and the other part flows to the grid-connected inverter module for inversion and then fed back to the mains power intelligent aging cabinet. Step S05: The central controller times and obtains the discharge aging duration and the number of aging cycles. When the duration of discharge aging reaches the duration of a single discharge operation... ,and If the charging or discharging aging duration is zeroed, return to step S02 to execute the next round of charging aging; if At this time, the central controller will execute a shutdown operation.

[0006] The beneficial effects of this application are as follows: the mains-powered intelligent aging cabinet is equipped with an AC power output terminal and has a built-in grid-connected inverter module and a central controller. By relying on the built-in grid-connected inverter module, excess electrical energy is fed back to the mains-powered intelligent aging cabinet for reuse, eliminating the inefficient mode of pure resistive heat consumption, and significantly reducing the overall energy consumption and electricity cost of mass production aging tests. At the same time, the central controller has global operating condition scheduling capabilities and can uniformly manage the working status of subsequent bidirectional chargers and electronic loads. The first bidirectional charger connects to the AC power output of the mains-powered intelligent aging cabinet via its AC input terminal. Its DC output terminal forms a DC series bus with the DC input terminal of the second bidirectional charger. This allows for dynamic switching between charging and discharging aging modes. In charging aging mode, it performs AC-to-DC energy conversion to provide stable aging test power to downstream equipment. In discharging aging mode, it switches to inverter mode, continuously maintaining the internal circulation of power between the first and second bidirectional chargers and the DC bidirectional electronic load. This counteracts voltage deviations caused by parameter variations in the first and second bidirectional chargers, suppresses circulating current in the DC series bus loop, and prevents test shutdowns due to overvoltage and overcurrent protection triggering, ensuring the continuity and stability of multi-machine series aging tests. The second bidirectional charger connects to the DC output of the first bidirectional charger via its DC input terminal, forming a DC series bus with it. This allows for synchronous switching between charging and discharging aging conditions. By synchronously switching operating conditions, it replicates real-world network charging and discharging behavior, fully restoring the power interaction and load matching characteristics under series conditions. This significantly aligns with actual engineering application scenarios, enhancing the realism and defect exposure capabilities of aging tests. The AC electronic loads are connected to the AC output of the second bidirectional charger and the mains-powered intelligent aging cabinet, respectively, to handle the basic power consumption function under discharge aging conditions. They can continuously consume the AC power output from the second bidirectional charger inverter in discharge aging mode, undertaking most of the conventional discharge load and constructing a stable and controllable power consumption load environment to simulate the actual load operation of the equipment. Simultaneously, they work with the downstream DC bidirectional electronic load and grid-connected inverter module to form a hierarchical power consumption system, distinguishing between conventional power consumption, dynamic power replenishment, and grid feedback paths. The DC bidirectional electronic load connects to the series bus in parallel via DC terminals and to the DC series bus via AC terminals. Relying on real-time voltage monitoring and a dynamic power absorption and output mechanism, it can participate in the internal power circulation of the DC series bus. When the AC electronic load cannot fully consume the inverter power, it balances the bus voltage through dynamic power replenishment and power absorption, offsetting fluctuations caused by operating condition switching and load changes, stabilizing the overall operating conditions, effectively avoiding shutdown and error problems caused by voltage anomalies, providing steady-state operating conditions for long-term uninterrupted grid aging, and further avoiding test interruption issues. Attached Figure Description

[0007] The accompanying drawings, which are included to provide a further understanding of this application and form part of this application, illustrate exemplary embodiments of this application and are used to explain this application, but do not constitute an undue limitation of this application. In the drawings: Figure 1 This is a schematic diagram of the topology of the dual bidirectional power supply series energy-saving aging test system in Example 1; Figure 2 This is a detailed flowchart illustrating the steps of the dual bidirectional power supply series-connected energy-saving aging test control method in Example 2. Detailed Implementation

[0008] The following drawings disclose several embodiments of the present invention. For clarity, many practical details will be described in the following description. However, it should be understood that these practical details are not intended to limit the invention. That is, in some embodiments of the invention, these practical details are not essential. Furthermore, for the sake of simplicity, some conventional structures and components will be shown in the drawings in a simple schematic manner.

[0009] To further understand the invention's content, features, and effects, the following embodiments are provided, along with detailed descriptions in conjunction with the accompanying drawings: Example 1 Reference Figure 1 , Figure 1This is a schematic diagram of the topology of the dual bidirectional power supply series-type energy-saving aging test system in this embodiment. This embodiment provides a dual bidirectional power supply series-type energy-saving aging test system, including a mains-powered intelligent aging cabinet, a first bidirectional charger, a second bidirectional charger, an AC electronic load, and a DC bidirectional electronic load. The mains-powered intelligent aging cabinet has an AC power output terminal for outputting AC power. The first bidirectional charger has an AC input terminal and a DC output terminal, with the AC input terminal electrically connected to the AC power output terminal. In charging aging mode, it rectifies and converts the received AC power into DC power, and in discharging aging mode, it operates in inverter mode, enabling the electrical energy on the DC series bus to circulate internally between the first bidirectional charger and the second bidirectional charger. The second bidirectional charger has a DC input terminal and an AC output terminal, with the DC input terminal electrically connected to the DC series bus. The DC output terminal is electrically connected to form a DC series bus, which is used to receive DC power output from the first bidirectional charger for charging and aging in charging aging mode, and to invert DC power into AC power output in discharging aging mode. The AC electronic load is electrically connected to the AC output terminal and the mains intelligent aging cabinet respectively, and is used to consume the AC power output from the second bidirectional charger in discharging aging mode. The DC bidirectional electronic load has DC terminals and AC terminals. The DC terminals are connected in parallel to the DC series bus, and the AC terminals are electrically connected to the AC electronic load. It is used to monitor the real-time voltage value of the DC series bus in real time, and dynamically adjust the voltage difference of the DC series bus by absorbing or outputting electrical energy to stabilize the real-time voltage value and avoid circulating current in the DC series bus circuit.

[0010] The mains-powered intelligent aging cabinet also has a built-in grid-connected inverter module and a central controller. The grid-connected inverter module is electrically connected to the AC electronic load and is used to invert the excess electrical energy that cannot be completely consumed in the AC electronic load and feed it back to the mains-powered intelligent aging cabinet. The central controller establishes communication connections with the first bidirectional charger, the second bidirectional charger, the AC electronic load, and the DC bidirectional electronic load, respectively, to uniformly issue operating condition commands, collect the voltage, current, and temperature operating data of the entire circuit, and control the first bidirectional charger and the second bidirectional charger to automatically switch between charging aging mode and discharging aging mode.

[0011] In charging aging mode, the central controller controls the AC power output terminal to output AC power, which is then transmitted to the first bidirectional charger via the AC input terminal. The first bidirectional charger rectifies the received AC power into DC power, which is then transmitted to the DC input terminal via the DC output terminal and then to the second bidirectional charger via the DC input terminal. The second bidirectional charger then uses the received DC power for charging aging. In discharging aging mode, the first and second bidirectional chargers are switched to inverter mode, allowing the electrical energy on the DC series bus to circulate internally between the first and second bidirectional chargers. The second bidirectional charger then inverts the received DC power into AC power, which is transmitted to the AC electronic load via the AC output terminal to simulate energy consumption. Excess energy that cannot be fully consumed flows partly to the DC bidirectional electronic load via the AC terminal for replenishment, and the other part flows to the grid-connected inverter module for inversion and then fed back to the mains intelligent aging cabinet.

[0012] In this example, the central controller sends unified operating condition commands to the first bidirectional charger, the second bidirectional charger, the AC electronic load, and the DC bidirectional electronic load via the communication bus, controlling the first and second bidirectional chargers to automatically switch between charging aging mode and discharging aging mode. When operating in charging aging mode, the central controller sends a power supply command to the mains-powered intelligent aging cabinet via the communication bus. The mains-powered intelligent aging cabinet responds to this command by controlling the AC power output terminal to output AC power and transmit it to the AC input terminal. This AC power is then transmitted to the first bidirectional charger via the AC input terminal. The first bidirectional charger rectifies the received AC power into DC power. This DC power is then transmitted via the DC output terminal along the DC series bus to the DC input terminal of the second bidirectional charger, and then to the second bidirectional charger via the DC input terminal. The second bidirectional charger receives the DC power and directs it into its internal energy storage capacitor or battery pack for charging aging, allowing the first and second bidirectional chargers to enter the charging aging process synchronously. During this process, the DC current flowing on the DC series bus is from the first bidirectional charger to the second bidirectional charger, ensuring that the first and second bidirectional chargers perform charging aging tests synchronously.

[0013] When operating in discharge aging mode, the central controller synchronously sends switching commands to the first and second bidirectional chargers via the communication bus, controlling them to switch to inverter mode. The first bidirectional charger responds to this switching command by inverting the DC power on the DC series bus into AC power. Since the AC power output is in an unloaded or high-resistance state (i.e., disconnected) in discharge aging mode, the AC power cannot be output through the AC input of the first bidirectional charger. In other words, the AC power output from the first bidirectional charger cannot supply active power to the mains intelligent aging cabinet. Therefore, the first bidirectional charger is actually in an unloaded inverter state. In this state, the DC power drawn from the DC series bus by the first bidirectional charger is mainly used to maintain its own inverter operation losses, rather than to supply energy externally. Because the first bidirectional charger is in an unloaded inverter state, its energy extraction from the DC series bus is minimal, equivalent only to its own unloaded losses, allowing the energy on the DC series bus to circulate internally between the first and second bidirectional chargers. In response to the switching command, the second bidirectional charger inverts the DC power on the DC series bus into AC power. This AC power is then transmitted to the AC electronic load via the AC output terminal of the second bidirectional charger. The AC electronic load consumes the received AC power as heat. Excess energy that cannot be fully consumed by the AC electronic load is partially diverted through the AC terminals of the DC bidirectional electronic load, where it is converted back to DC and added to its internal energy storage unit for subsequent voltage regulation. The remaining portion flows to the grid-connected inverter module built into the mains-powered intelligent aging cabinet. The grid-connected inverter module adjusts the phase and frequency of this AC power to be synchronized with the mains power grid before feeding it back to the mains-powered intelligent aging cabinet, achieving energy recovery and utilization. Through this discharge aging mode, the first and second bidirectional chargers form an energy circulation loop on the DC series bus, requiring only the replenishment of system losses to maintain long-term aging tests, significantly reducing test energy consumption.

[0014] From the perspective of the DC series bus, the first bidirectional charger draws less DC power from the DC series bus, mainly to maintain its own no-load losses. The second bidirectional charger draws more DC power from the DC series bus for inverter output to AC electronic loads and grid feedback. Because the no-load inverter state of the first bidirectional charger results in a much smaller energy draw from the DC series bus than the second bidirectional charger, the voltage on the DC series bus is mainly determined by the operating state of the second bidirectional charger. The no-load inverter state of the first bidirectional charger forms a stable voltage reference on the DC series bus. This voltage reference point and the operating voltage of the second bidirectional charger together determine the midpoint voltage of the DC series bus. Through the dynamic adjustment of the midpoint voltage by the DC bidirectional electronic load, that is, the voltage reference provided by the first bidirectional charger and the energy consumed by the second bidirectional charger are matched, the voltage on the DC series bus remains stable. Electrical energy can circulate between the two bidirectional chargers, and only the system losses need to be replenished to maintain long-term aging tests.

[0015] Furthermore, during power-on initialization, the central controller inputs the rated power, rated voltage, and rated current of the first and second bidirectional chargers, and sets the target charging / discharging voltage value, target charging / discharging current value, and charging duration per cycle. Discharge duration during a single operation Total number of loops and differential pressure safety threshold The central controller determines the duration of each charging cycle based on the charging time. and duration of single discharge operation The system performs alternating timing and generates a switching command when a switching node is reached to control the automatic switching between charging aging mode and discharging aging mode of the first bidirectional charger and the second bidirectional charger. The central controller also collects the voltage difference of the DC series bus, the voltage and current values ​​of each port of the first bidirectional charger and the second bidirectional charger, and the temperature value in real time through the communication bus, and packages them into an operation dataset. Each parameter in the operation dataset is compared with the corresponding preset safety threshold. When any parameter exceeds the preset safety threshold, a fault shutdown command is immediately generated to cut off the circuit, and the operation dataset at the time of the fault is locked before an alarm signal is output.

[0016] In this example, during power-on initialization, the central controller establishes a communication connection with the first and second bidirectional chargers via the communication bus and sends parameter read requests to them. In response to these requests, the first and second chargers transmit their internally stored rated power, rated voltage, and rated current parameters back to the central controller via the communication bus. The central controller then stores the received rated parameters in its internal storage unit. The target charge / discharge voltage, target charge / discharge current, and single-charge duration for this aging test are input through the central controller. Discharge duration during a single operation Total number of loops and differential pressure safety threshold The central controller stores the aforementioned settings in its internal storage unit as the basis for subsequent automatic cycle control. During test operation, when entering the charging aging mode, the central controller starts accumulating the time from zero, continuously increasing it in fixed time increments, such as 1 second. Simultaneously, in each timing cycle, it compares the current accumulated time duration with the internally stored duration of a single charging cycle. Numerical comparisons are performed, and when the current cumulative timing duration reaches the duration of a single charging cycle... When the switching node is reached, the central controller immediately sends a discharge switching command to the first and second bidirectional chargers simultaneously via the communication bus, controlling them to switch from charging aging mode to discharge aging mode. Upon switching to discharge aging mode, the timer restarts from zero, continuously increasing in fixed time increments, and the current accumulated time is compared with the internally stored duration of a single discharge cycle. Numerical comparisons are performed, and when the current cumulative timing duration reaches the duration of a single discharge operation... When the switching node is reached again, the central controller synchronously sends a charging switching command to the first and second bidirectional chargers via the communication bus, controlling them to switch from discharge aging mode back to charging aging mode. This alternating timing allows the first and second bidirectional chargers to cycle between charging and discharge aging modes. Throughout the test operation, the central controller collects real-time data via the communication bus, including the voltage difference across the DC series bus, the voltage and current values ​​at the AC input and DC output terminals of the first and second bidirectional chargers, as well as the temperature values ​​of each key power node. The central controller packages all collected parameters into a runtime dataset in chronological order of the timestamps and stores it in its internal buffer. The central controller then retrieves each parameter from the runtime dataset and compares it with the corresponding preset safety thresholds stored internally. These preset safety thresholds include the upper limit of the DC series bus voltage difference, the upper and lower limits of the voltage at each port, the upper limit of the current at each port, and the upper limit of the temperature. When any parameter in the running dataset exceeds the corresponding preset safety threshold, the central controller immediately generates a fault shutdown command. Responding to this command, the central controller sends a power circuit cutoff command via the communication bus to the first bidirectional charger, the second bidirectional charger, the AC electronic load, and the DC bidirectional electronic load, shutting them all down and stopping the entire test system. Simultaneously, the central controller transfers the running dataset corresponding to the fault occurrence from the buffer to non-volatile memory and locks it to prevent subsequent running data from overwriting the fault data. The central controller also controls the output of an alarm signal via the communication bus. This alarm signal includes a fault type identifier and a timestamp of the fault occurrence. The mains-powered intelligent aging cabinet responds to this alarm signal with an audible and visual alert and notifies the test personnel of the location of the fault and the parameter exceeding the limit.

[0017] Furthermore, the DC bidirectional electronic load monitors the real-time voltage value of the DC series bus. And compare them, when the real-time voltage value Higher than the preset benchmark value With differential pressure safety threshold When the sum of the values ​​is equal, it is determined that the output voltage of the first bidirectional charger is too high. The central controller then controls the DC bidirectional electronic load to operate in buck charging mode to match the output voltage of the charger. proportional charging current The system absorbs the higher voltage from the DC series bus and supplies it to the DC bidirectional electronic load, thereby lowering the real-time voltage value. When the real-time voltage value Below the preset benchmark value With differential pressure safety threshold If the input voltage of the second bidirectional charger is too low, the central controller will control the DC bidirectional electronic load to operate in boost discharge mode to match the output voltage. proportional discharge current The electrical energy stored in the DC bidirectional electronic load is released to the lower side of the DC series bus, thereby increasing the real-time voltage value. To obtain the real-time voltage value Dynamically maintained within the corresponding voltage fluctuation window Within this range, and to avoid circulating current in the DC series bus circuit.

[0018] In this example, the DC bidirectional electronic load acquires the voltage of the DC series bus between the first and second bidirectional chargers, obtaining the real-time voltage value of the DC series bus. The DC bidirectional electronic load records this real-time voltage value as... The data is then transmitted to the central controller via a communication bus. The central controller stores preset baseline values. and differential pressure safety threshold Preset baseline value The voltage difference safety threshold corresponds to the midpoint voltage of a DC series bus under ideal equilibrium conditions. This corresponds to the maximum allowable deviation of the midpoint voltage from the preset reference value. The central controller will receive the real-time voltage value. Compared with the preset benchmark value and differential pressure safety threshold Perform numerical comparisons when the real-time voltage value Higher than the preset benchmark value With differential pressure safety threshold When the voltage is equal to the output voltage of the first bidirectional charger, the central controller determines that the output voltage is too high and then sends a buck charging command to the DC bidirectional electronic load via the communication bus. The DC bidirectional electronic load responds to this buck charging command and operates in buck charging mode. The central controller then reads the real-time voltage value from its internal storage unit. Compared with the preset benchmark value The deviation amount, which is The central controller calculates the charging current based on this deviation. The charging current It is directly proportional to the deviation, that is, the larger the deviation, the larger the charging current. The larger the value, the smaller the deviation, and the faster the charging current. The smaller the value, the more the central controller will calculate the charging current. The data is transmitted to the DC bidirectional electronic load via the communication bus. The DC bidirectional electronic load then processes the received charging current. The system absorbs the higher current from the DC series bus, converts this electrical energy into DC, and stores it inside the DC bidirectional electronic load, thereby lowering the real-time voltage of the DC series bus. The DC bidirectional electronic load continuously performs the above sampling and uploading operations, while the central controller continuously performs the above comparison and calculation operations until the real-time voltage value is reached. Falling back to the voltage fluctuation window Within. When the real-time voltage value Below the preset benchmark value With differential pressure safety threshold When the input voltage of the second bidirectional charger is too low, the central controller determines that the input voltage is too low and then sends a boost discharge command to the DC bidirectional electronic load via the communication bus. The DC bidirectional electronic load responds to this boost discharge command and operates in boost discharge mode. The central controller then reads a preset reference value from its internal storage unit. With real-time voltage value The deviation amount, which is The central controller calculates the discharge current based on this deviation. The discharge current It is also directly proportional to its deviation, that is, the larger the deviation, the larger the discharge current. The larger the value, the smaller the deviation, and the faster the discharge current. The smaller the value, the more the central controller will calculate the discharge current. The data is transmitted to the DC bidirectional electronic load via the communication bus. The DC bidirectional electronic load then processes the received discharge current. The electrical energy stored inside the DC bidirectional electronic load is released to the lower side of the DC series bus, which replenishes the electrical energy corresponding to the second bidirectional charger, thereby raising the real-time voltage value of the DC series bus. The DC bidirectional electronic load continuously performs the above sampling and uploading operations, while the central controller continuously performs the above comparison and calculation operations until the real-time voltage value is reached. Rebound to voltage fluctuation window Within. Through this dynamic adjustment, the real-time voltage value of the DC series bus... Maintained at Within the voltage fluctuation window, circulating current is avoided in the DC series bus circuit due to inconsistent output voltages from the two bidirectional chargers. When the real-time voltage value... When the voltage falls within the voltage fluctuation window, the central controller determines that the DC series bus voltage has returned to a balanced state, stops charging and discharging operations, and maintains only the lowest power consumption operation state for voltage sampling and comparison calculations, continuously monitoring the real-time voltage value of the DC series bus with minimal static power consumption. The changes are recorded and uploaded to the central controller in real time. When the central controller detects the real-time voltage value... If the voltage deviates from the voltage fluctuation window again, the standby state is immediately exited, and the voltage regulation operation described above is repeated. Through this real-time dynamic balancing, the circulating current caused by the inconsistent output voltage of the two bidirectional chargers in the DC series bus circuit is effectively eliminated, ensuring that the two bidirectional chargers under test can operate stably in parallel for a long time. At the same time, in the discharge aging mode, after the AC power output from the second bidirectional charger is consumed by the AC electronic load, the excess energy that cannot be completely consumed by the AC electronic load flows to the AC terminal of the DC bidirectional electronic load. After being converted into DC power internally by the DC bidirectional electronic load, it replenishes its energy and reserves energy for subsequent boost discharge regulation.

[0019] Furthermore, the central controller also adjusts the real-time voltage value. Compared with the preset benchmark value Corresponding deviation Real-time calculation of the absolute value of the charging current or discharge current Among them, the charging current or discharge current The specific calculation formula is as follows: or ,in This is the proportionality coefficient. The integral coefficient is... is the differential coefficient.

[0020] In this example, the central controller receives the real-time voltage value uploaded by the DC bidirectional electronic load each time. Then, calculate the real-time voltage value. Compared with the preset benchmark value The absolute value of the deviation between them is denoted as . The central controller determines the value based on the absolute value of the deviation. Real-time calculation of charging current or discharge current The value contains a proportionality coefficient. Integral coefficient and differential coefficients Three operational parameters, scaling factor The integral coefficient corresponds to the weight of the immediate response to the current deviation. The differential coefficient corresponds to the weight for eliminating the cumulative effect of the deviation. This corresponds to the prediction weight of the trend of the deviation. First, the absolute value of the deviation is... Multiply by the proportionality factor Obtain the value of the proportional term, and then calculate the absolute value of the deviation. Multiply the integral value over time by the integral coefficient Obtain the value of the integral term, and then convert the absolute value of the deviation. Multiply the differential value with respect to time by the differential coefficient After obtaining the value of the differential term, the values ​​of the proportional term, integral term, and differential term are added together to obtain the charging current. or discharge current The final value, that is or The charging current and discharging current can be set with different PID coefficients independently, which means that the deviation between the charging aging mode and the discharging aging mode in actual operation is different. proportionality coefficient Integral coefficient and differential coefficients They are all different. The central controller will use this charging current. or discharge current The received current value is transmitted to the DC bidirectional electronic load via the communication bus. The DC bidirectional electronic load then controls its output to control the corresponding charging or discharging current, thereby regulating the voltage of the DC series bus. In other words, when the real-time voltage value... Higher than the preset benchmark value With differential pressure safety threshold When the summation occurs, the central controller determines that the output voltage of the first bidirectional charger is too high, and then controls the DC bidirectional electronic load to charge with the corresponding current. The system absorbs electrical energy from the higher-than-normal side of the DC series bus, converts this energy into DC, and stores it inside the DC bidirectional electronic load, thereby lowering the real-time voltage of the DC series bus. When the real-time voltage value Below the preset benchmark value With differential pressure safety threshold When the input voltage of the second bidirectional charger is too low, the central controller determines that the input voltage of the second bidirectional charger is too low, and then controls the DC bidirectional electronic load to discharge with the corresponding current. The electrical energy stored inside the DC bidirectional electronic load is released to the lower side of the DC series bus, thereby raising the real-time voltage value of the DC series bus. The central controller repeatedly performs the above-mentioned calculations of the absolute value of the deviation, the proportional term, the integral term, the differential term, and the summation of the current value in each sampling cycle, so that the charging current... or discharge current Able to determine the deviation amount Real-time dynamic adjustment based on changes. When the deviation... When the absolute value is large, the proportional term dominates, providing a larger charging or discharging current to quickly reduce the deviation; when the deviation is large... When the absolute value is small, the integral term gradually accumulates to eliminate static error, thus improving the real-time voltage value. It eventually stabilized at the preset benchmark value. Near; the value of the differential term is in the deviation. When the absolute value of the voltage changes abruptly, it provides advance regulation to suppress voltage overshoot or undershoot. Through this PID calculation, the central controller controls the DC bidirectional electronic load to regulate the DC series bus voltage with fast response speed and high steady-state accuracy, effectively maintaining the real-time voltage value. Within the voltage fluctuation window.

[0021] Furthermore, when the first bidirectional charger and the second bidirectional charger are in discharge aging mode, the AC electronic load receives load parameter instructions from the central controller, which include the target power consumption value. The system dynamically adjusts the equivalent impedance value of the AC electronic load according to load parameter commands to simulate the AC power consumed by the second bidirectional charger inverter at different power levels; the AC electronic load also provides real-time feedback on the current actual power consumption value. The data is then uploaded to the central controller, which will then record the target power consumption value. Compared with the current actual power consumption value If a comparison is made, Exceeding the preset power deviation threshold Then, the load parameter readjustment command is sent to the AC electronic load.

[0022] In this example, when the first bidirectional charger and the second bidirectional charger are in discharge aging mode, the central controller issues a corresponding load parameter command, which includes the target power consumption value. When the system switches to discharge aging mode, the central controller sends the load parameter command to the AC electronic load via the communication bus. After receiving the load parameter command, the AC electronic load calculates the target power consumption value. The internal equivalent impedance value is dynamically adjusted so that the AC power absorbed by the AC electronic load from the AC output terminal of the second bidirectional charger is close to the target power consumption value. The AC electronic load calculates the actual power consumption of the AC electronic load in real time and records this actual power consumption value as... The data is then transmitted to the central controller via the communication bus. The central controller receives the current actual power consumption value. Compared with the target power consumption value Perform the subtraction operation to obtain the power deviation value. and the absolute value of the power deviation value Power deviation threshold from internal storage Comparison. When Exceeding the power deviation threshold When the central controller determines that the actual power consumption of the AC electronic load deviates too much from the target value, it immediately recalculates and adjusts the target power consumption value in the load parameter command based on the magnitude of the power deviation. The adjusted load parameter command is then sent back to the AC electronic load via the communication bus. The AC electronic load readjusts its internal equivalent impedance value according to the updated load parameter command to match the current actual power consumption value. Power consumption value to the updated target Approaching, until Falling back to the power deviation threshold Within P. Through this closed-loop regulation, the AC electronic load can stably consume the AC power output from the second bidirectional charger inverter within the set power range.

[0023] Furthermore, while generating a fault shutdown command, the central controller also sends a discharge command to the DC bidirectional electronic load via the communication bus. In response to the discharge command, the DC bidirectional electronic load controls itself to operate in a fast discharge mode, releasing the electrical energy stored inside the DC bidirectional electronic load to the DC series bus at the maximum allowable discharge current. The energy is then inverted and transmitted to the AC electronic load via the second bidirectional charger until the stored electrical energy drops below the preset safe charge level. At this point, a discharge completion signal is generated and fed back to the central controller via the communication bus. After receiving the discharge completion signal from the DC bidirectional electronic load, the central controller executes the fault shutdown command to cut off the circuit.

[0024] In this example, the central controller, while generating a fault shutdown command, simultaneously sends a discharge command to the DC bidirectional electronic load via the communication bus. Responding to this discharge command, the DC bidirectional electronic load switches to a fast discharge mode. In fast discharge mode, the DC bidirectional electronic load continuously releases its internally stored electrical energy to the DC series bus at the maximum permissible discharge current it can withstand. The released energy is transmitted along the DC series bus to the DC input terminal of the second bidirectional charger. Upon detecting the electrical input, the second bidirectional charger inverts the received DC power into AC power. This AC power is then transmitted to the AC electronic load via the AC output terminal of the second bidirectional charger, where it is consumed as heat. The DC bidirectional electronic load monitors its remaining internal charge in real time and compares this charge with a preset safe charge level. This preset safe charge level corresponds to the maximum remaining charge the DC bidirectional electronic load is allowed to retain under safe shutdown conditions; this value is set as a low percentage of the DC bidirectional electronic load's rated capacity. When the remaining power level drops below the preset safe charge level, the discharge is considered complete. The DC bidirectional electronic load then generates a discharge completion signal and uploads it to the central controller via the communication bus. After generating a fault shutdown command and issuing a discharge command, the central controller does not immediately execute the loop disconnection operation but enters a waiting state, continuously monitoring the discharge completion signal on the communication bus. During the waiting period, the central controller does not issue loop disconnection commands to any device, ensuring that the DC bidirectional electronic load has sufficient time to safely release its internally stored energy. Only when the central controller receives the discharge completion signal from the DC bidirectional electronic load via the communication bus is the discharge process considered complete, allowing the execution of the fault shutdown command. The central controller then issues the final power loop disconnection command to the first bidirectional charger, the second bidirectional charger, the AC electronic load, and the DC bidirectional electronic load via the communication bus, shutting down all devices and putting the entire test system into a safe shutdown state. Through this discharge process, the energy stored inside the DC bidirectional electronic load is safely released before shutdown, avoiding equipment damage or safety hazards caused by residual energy and ensuring the safety of the system during fault shutdown.

[0025] In summary, after the system is powered on, the central controller reads the rated power, rated voltage, and rated current parameters of the first and second bidirectional chargers through the communication bus and stores them in the internal storage unit. At the same time, it sets the target charging and discharging voltage value, the target charging and discharging current value, the duration of a single charging operation, the duration of a single discharging operation, the total number of cycles, and the differential pressure safety threshold and stores them in the internal storage unit.

[0026] The central controller first puts the first and second bidirectional chargers into charging aging mode and sends a power supply command to the mains-powered intelligent aging cabinet via the communication bus. The mains-powered intelligent aging cabinet responds to the power supply command by outputting AC power, which is then transmitted to the AC input of the first bidirectional charger via its output terminal. The first bidirectional charger rectifies the received AC power into DC power, which is then transmitted to the DC input of the second bidirectional charger via its DC output terminal. The second bidirectional charger then feeds the received DC power into its internal energy storage capacitor or battery pack for charging aging. Simultaneously, the central controller accumulates a timer from zero in charging aging mode. When the accumulated time reaches the duration of a single charging cycle, the central controller determines that a switching point has been reached and simultaneously sends a switching command to both the first and second bidirectional chargers via the communication bus, controlling them to switch synchronously to discharging aging mode.

[0027] Upon entering the discharge aging mode, the first bidirectional charger responds to the switching command and operates in inverter mode to convert the DC power on the DC series bus into AC power. Since the AC power output of the mains-powered intelligent aging cabinet is disconnected in discharge aging mode, the AC power cannot be output through the first bidirectional charger. Therefore, the first bidirectional charger is in an unloaded inverter state, and the DC power drawn from the DC series bus is only used to maintain its own inverter operation and minimize unloaded losses, allowing the electrical energy on the DC series bus to circulate internally between the first and second bidirectional chargers. The second bidirectional charger also responds to the switching command and operates in inverter mode to convert the DC power on the DC series bus into AC power. This AC power is transmitted to the AC electronic load via the AC output of the second bidirectional charger. After receiving the load consumption command from the central controller, the AC electronic load adjusts its internal equivalent impedance value, consuming the received AC power as heat. Excess electrical energy that cannot be fully consumed by the AC electronic load flows partly to the AC terminals of the DC bidirectional electronic load, where it is converted to DC to replenish its internal energy. The other part flows to the grid-connected inverter module built into the mains-powered intelligent aging cabinet. This inverter module adjusts the phase and frequency of this AC power to synchronize with the mains power grid before feeding it back to the mains-powered intelligent aging cabinet. Simultaneously, the central controller also starts accumulating time from zero in discharge aging mode. When the accumulated time reaches the duration of a single discharge cycle, the central controller again determines that a switching point has been reached and controls both chargers to switch back to charging aging mode. This alternating timing allows the first and second bidirectional chargers to cycle between charging and discharging aging modes until the total number of cycles is reached.

[0028] In charge aging mode or discharge aging mode, the DC bidirectional electronic load collects the real-time voltage value of the DC series bus. The real-time voltage value is then uploaded to the central controller via the communication bus. The central controller receives the real-time voltage value. Compared with the preset baseline value of internal storage and differential pressure safety threshold Perform numerical comparisons when the real-time voltage value Higher than the preset benchmark value With differential pressure safety threshold When the sum of the values ​​is reached, the central controller determines that the output voltage of the first bidirectional charger is too high, and then sends a buck charging command to the DC bidirectional electronic load via the communication bus. The DC bidirectional electronic load responds to this buck charging command and controls itself to operate in buck charging mode, in order to... minus The charging current is proportional to the deviation. The system absorbs electrical energy from the higher-than-normal side of the DC series bus, converts this energy into DC current, and stores it inside the DC bidirectional electronic load, thereby lowering the real-time voltage of the DC series bus. When the real-time voltage value Below the preset benchmark value With differential pressure safety threshold When the input voltage of the second bidirectional charger is too low, the central controller determines that the input voltage is too low and then sends a boost discharge command to the DC bidirectional electronic load via the communication bus. The DC bidirectional electronic load responds to this boost discharge command and controls itself to operate in boost discharge mode to match the output voltage of the second bidirectional charger. minus The discharge current is proportional to the deviation. The electrical energy stored inside the DC bidirectional electronic load is released to the lower side of the DC series bus, thereby raising the real-time voltage value of the DC series bus. The central controller uses real-time voltage values. Compared with the preset benchmark value The absolute value of the deviation between Through the proportionality coefficient Integral coefficient and differential coefficients Weighted calculation of charging current in real time or discharge current The value is, specifically or and the charging current or discharge current The value is transmitted via the communication bus to the DC bidirectional electronic load to absorb or output electrical energy. Through this dynamic adjustment, the real-time voltage value of the DC series bus is... Maintained within the voltage fluctuation window Within this range, avoid circulating current in the DC series bus circuit.

[0029] In discharge aging mode, the AC electronic load receives load parameter commands from the central controller, which include the target power consumption value. The AC electronic load consumes power according to the target value. The internal equivalent impedance value is dynamically adjusted so that the AC power absorbed from the AC output terminal of the second bidirectional charger is close to the target power consumption value. The AC electronic load calculates the current actual power consumption value in real time. The data is then transmitted to the central controller via the communication bus, and the central controller displays the current actual power consumption value. Compared with the target power consumption value The power deviation value is obtained by subtraction. When the absolute value of the power deviation value is... Exceeding the internal storage power deviation threshold At this time, the central controller readjusts the target power consumption value in the load parameter command. And then send it again to the AC electronic load to adjust the current actual power consumption value. Power consumption value to the updated target Approaching.

[0030] Throughout the test operation, the central controller collects real-time data via the communication bus, including the differential voltage of the DC series bus, the voltage and current values ​​at each port of the first and second bidirectional chargers, and the temperature. All these parameters are packaged into a runtime dataset in timestamp order. The central controller compares each parameter in the runtime dataset with its corresponding preset safety threshold. If any parameter exceeds the preset safety threshold, a fault shutdown command is immediately generated. Simultaneously, the central controller sends a discharge command to the DC bidirectional electronic load via the communication bus. Responding to this discharge command, the DC bidirectional electronic load switches to a fast discharge mode, releasing its internally stored energy to the DC series bus with the maximum permissible discharge current. This energy is then inverted by the second bidirectional charger and transmitted to the AC electronic load for consumption. The DC bidirectional electronic load monitors its remaining charge in real-time. When the remaining charge drops below a preset safe charge level, a discharge completion signal is generated and uploaded to the central controller via the communication bus. Only after receiving the discharge completion signal can the central controller execute the fault shutdown command. It sends power circuit cut-off commands to the first bidirectional charger, the second bidirectional charger, the AC electronic load, and the DC bidirectional electronic load through the communication bus, shutting them all down. At the same time, it transfers the operating data set corresponding to the time of the fault to non-volatile memory for locking and storage, and outputs an alarm signal.

[0031] Example 2 Please review Figure 1 And refer to them together Figure 2 , Figure 2This is a detailed flowchart illustrating the steps of the dual-bidirectional power supply series-connected energy-saving aging test control method in Example 2. The present invention also provides a dual-bidirectional power supply series-connected energy-saving aging test control method, which is applied to the dual-bidirectional power supply series-connected energy-saving aging test system as described in Example 1, and includes the following steps: Step S01: The system is powered on and initialized. The central controller reads the rated parameters of the first and second bidirectional chargers and sets the target charging and discharging voltage, target charging and discharging current, and charging duration per cycle. Discharge duration during a single operation Total number of loops and differential pressure safety threshold ; In this embodiment, after the system is powered on, the central controller establishes a communication connection with the first and second bidirectional chargers via the communication bus and sends parameter read requests to the first and second bidirectional chargers. In response to these requests, the first and second bidirectional chargers transmit their internally stored rated power, rated voltage, and rated current parameters back to the central controller via the communication bus. The central controller then stores the received rated parameters in its internal storage unit. The tester inputs the target charge / discharge voltage, target charge / discharge current, and single charging cycle duration for this aging test through the central controller's human-machine interface. Discharge duration during a single operation Total number of loops and differential pressure safety threshold The central controller stores the above settings in its internal storage unit as the basis for subsequent automatic cyclic control.

[0032] Step S02: The central controller controls the first and second bidirectional chargers to be in charging aging mode, and controls the AC power output terminal to output AC power. The AC power is transmitted from the AC power output terminal to the AC input terminal, and then to the first bidirectional charger. The first bidirectional charger rectifies the received AC power into DC power, and transmits it from the DC output terminal along the DC series bus to the DC input terminal, and then to the second bidirectional charger. The second bidirectional charger performs charging aging on the received DC power, so that the first and second bidirectional chargers enter the charging aging condition simultaneously. Under the charging aging condition, the DC bidirectional electronic load continuously monitors the real-time voltage value. and based on Compared with the preset benchmark value The deviation amount dynamically feeds in electrical energy to maintain This eliminates the circulating current in the DC series bus circuit; In this embodiment, the central controller sends a power supply command to the mains-powered intelligent aging cabinet via the communication bus. The mains-powered intelligent aging cabinet responds to this command by controlling its AC power output. This AC power is transmitted from the AC power output terminal to the AC input terminal, and then from the AC input terminal to the first bidirectional charger. The first bidirectional charger rectifies the received AC power into DC power. This DC power is transmitted from the DC output terminal of the first bidirectional charger along the DC series bus to the DC input terminal, and then from the DC input terminal to the second bidirectional charger. The second bidirectional charger receives the DC power and directs it into its internal energy storage capacitor or battery pack for charging and aging, allowing the first and second bidirectional chargers to enter the charging and aging process synchronously. A DC bidirectional electronic load collects the voltage of the DC series bus between the first and second bidirectional chargers to obtain the real-time voltage value of the DC series bus. and the real-time voltage value The data is transmitted to the central controller via the communication bus. The central controller then receives the real-time voltage values. Compared with the preset baseline value of internal storage The deviation is obtained by subtraction. The absolute value of this deviation is then compared with the differential pressure safety threshold. Perform numerical comparisons, when the deviation... The absolute value is greater than or equal to the differential pressure safety threshold. When the central controller determines that the DC series bus voltage deviates from the preset reference value, it immediately sends an adjustment command to the DC bidirectional electronic load via the communication bus. The DC bidirectional electronic load responds to this adjustment command by adjusting the real-time voltage value... Higher than the preset benchmark value At this time, it is controlled to operate in buck charging mode, so that the charging current proportional to the deviation absorbs the electrical energy on the higher side of the DC series bus and stores it inside the DC bidirectional electronic load, thereby lowering the real-time voltage value. When the real-time voltage value Below the preset benchmark value At this time, it is controlled to operate in boost discharge mode, using a discharge current proportional to the deviation to release the internally stored electrical energy to the lower side of the DC series bus, thereby raising the real-time voltage value. Through this dynamic adjustment, the real-time voltage value is... Compared with the preset benchmark value The absolute value of the deviation between them always remains within the pressure differential safety threshold. The following steps aim to eliminate the circulating current in the DC series bus circuit caused by the inconsistent output voltages of the two bidirectional chargers.

[0033] Step S03: The central controller times and obtains the charging aging duration. When the charging aging duration reaches the duration of a single charging cycle... When the central controller determines that the operating condition switching conditions are met, it immediately issues a switching command to control the first bidirectional charger and the second bidirectional charger to switch to discharge aging mode simultaneously. In this embodiment, when the first and second bidirectional chargers enter the charging aging condition in step S02, the central controller starts accumulating the time from zero, continuously increasing it in fixed time increments, such as 1 second increments, to obtain the charging aging duration. In each timing cycle, the central controller compares the charging aging duration with the internally stored duration of a single charging cycle. Numerical comparisons were performed, and the duration of charging aging was compared to the duration of a single charging cycle. When the conditions for switching operating modes are met, the central controller determines that the switching conditions are met and then simultaneously sends a switching command to the first and second bidirectional chargers via the communication bus. This switching command includes an operating mode identifier for the discharge aging mode. Upon receiving the switching command, the first and second bidirectional chargers simultaneously switch to the discharge aging mode.

[0034] Step S04: After entering the discharge aging mode, the central controller controls the first and second bidirectional chargers to switch to inverter mode, enabling the electrical energy on the DC series bus to circulate internally between the first and second bidirectional chargers. Then, the second bidirectional charger inverts the received DC power into AC power, which is transmitted to the AC electronic load via the AC output terminal to simulate energy consumption. Simultaneously, the DC bidirectional electronic load continuously performs the voltage dynamic balancing operation in step S02 to ensure the real-time voltage value... Always satisfied Excess electrical energy that cannot be fully consumed by the AC electronic load flows partly to the DC bidirectional electronic load through the AC terminal for replenishment, and the other part flows to the grid-connected inverter module for inversion and then fed back to the mains power intelligent aging cabinet. In this embodiment, after entering the discharge aging mode, the first bidirectional charger responds to the switching command issued by the central controller and controls itself to operate in inverter mode, converting the DC power on the DC series bus into AC power. Since the AC power output terminal of the mains intelligent aging cabinet is disconnected in the discharge aging mode, the AC power cannot be output to the outside through the first bidirectional charger. Therefore, the first bidirectional charger is in an unloaded inverter state, and the DC power drawn from the DC series bus is only used to maintain its own inverter operation and reduce the unloaded loss, so that the electrical energy on the DC series bus can be internally circulated between the first bidirectional charger and the second bidirectional charger. The second bidirectional charger responds to the switching command issued by the central controller and controls itself to operate in inverter mode as well, converting the DC power on the DC series bus into AC power. The AC power is transmitted to the AC electronic load through the AC output terminal of the second bidirectional charger. After receiving the load consumption command issued by the central controller, the AC electronic load adjusts its internal equivalent impedance value and consumes the received AC power as heat energy, simulating the consumption behavior of an actual electrical load. The DC bidirectional electronic load continues to perform the voltage dynamic balancing operation in step S02 under discharge aging mode, and it also collects the real-time voltage value of the DC series bus in real time. And upload it to the central controller, which then updates it based on the real-time voltage value. Compared with the preset benchmark value The deviation is dynamically adjusted to control the charging or discharging current of the DC bidirectional electronic load, ensuring the real-time voltage value. Compared with the preset benchmark value The absolute value of the deviation between them always remains within the pressure differential safety threshold. The excess electrical energy that cannot be completely consumed by the AC electronic load flows partly to the AC terminals of the DC bidirectional electronic load, where it is converted into DC power to replenish its internal energy; the other part flows to the grid-connected inverter module built into the mains-powered intelligent aging cabinet. The grid-connected inverter module adjusts the phase and frequency of this AC power to be synchronized with the mains power grid before feeding it back to the mains-powered intelligent aging cabinet.

[0035] Step S05: The central controller times and obtains the discharge aging duration and the number of aging cycles. When the duration of discharge aging reaches the duration of a single discharge operation... ,and If the charging or discharging aging duration is zeroed, return to step S02 to execute the next round of charging aging; if At this time, the central controller will execute a shutdown operation.

[0036] In this embodiment, when the central controller enters the discharge aging mode in step S04, it starts accumulating from zero and continuously increments by a fixed time increment, such as 1 second, to obtain the discharge aging duration. The central controller has an internal loop counter, which is cleared to zero during the initialization phase in step S01. In each timing cycle, the central controller compares the discharge aging duration with the internally stored duration of a single discharge operation. Numerical comparisons were performed, and the duration of discharge aging was compared to the duration of a single discharge operation. When the discharge aging phase is determined to be over, the central controller increments the current value of the cycle counter by one, updating the number of aging cycles completed. Then the updated Total number of loops Numerical comparisons were performed based on the number of aging cycles completed. Less than the total number of loops If the preset number of cycles has not been reached, the central controller resets the charging or discharging aging duration to zero and returns to step S02 to execute the next round of charging aging. It then reissues a power supply command to the mains-powered intelligent aging cabinet via the communication bus, controlling the first and second bidirectional chargers to re-enter the charging aging mode and execute the next round of charging aging. When the number of completed aging cycles... Greater than or equal to the total number of loops When the preset number of cycles has been reached, the central controller executes a shutdown operation, sending a power circuit cutoff command to the first bidirectional charger, the second bidirectional charger, the AC electronic load, and the DC bidirectional electronic load via the communication bus, turning off all of them. At the same time, all the operating data collected during the entire test process is packaged and stored in the non-volatile memory inside the central controller in the order of timestamps for later review and analysis.

[0037] Furthermore, during the operation of steps S02 and S04, the central controller continuously monitors the DC series bus voltage difference, the voltage and current values ​​of each port of the first bidirectional charger and the second bidirectional charger, as well as the temperature value, and packages them into an operation dataset. When any parameter in the operation dataset exceeds the preset safety threshold, the central controller immediately generates a fault shutdown command to cut off the circuit, and outputs an alarm signal after locking the operation dataset at the time of the fault.

[0038] In this embodiment, during the operation of the charging aging mode in step S02 and the discharging aging mode in step S04, the central controller collects in real time the voltage difference across the DC series bus, the voltage and current values ​​at the AC input and DC output terminals of the first bidirectional charger, the voltage and current values ​​at the DC input and AC output terminals of the second bidirectional charger, and the temperature values ​​of each key power node via the communication bus. The central controller packages all the collected parameters into a running dataset according to the timestamp of the collection time and stores it in its internal buffer. The central controller retrieves each parameter from the running dataset one by one and compares it with the corresponding preset safety threshold stored internally. The preset safety threshold includes the upper limit of the DC series bus voltage difference, the upper and lower limits of the voltage at each port, the upper limit of the current at each port, and the upper limit of the temperature. When any parameter in the running dataset exceeds the corresponding preset safety threshold, a shutdown command is immediately generated. In response to the shutdown command, the central controller sends a power circuit cutoff command to the first bidirectional charger, the second bidirectional charger, the AC electronic load, and the DC bidirectional electronic load via the communication bus, shutting down all of them and stopping the entire test system. Simultaneously, the central controller transfers the operational data set corresponding to the fault occurrence from its internal buffer to non-volatile memory for locking and storing, preventing subsequent operational data from overwriting the fault data. The central controller also controls the output of an alarm signal via the communication bus. This alarm signal includes a fault type identifier and a timestamp of the fault occurrence. The mains-powered intelligent aging cabinet responds to this alarm signal with an audible and visual alert, notifying the test personnel of the location of the fault and the parameter exceeding the limit.

[0039] Furthermore, the basis described in step S02 Compared with the preset benchmark value The deviation amount dynamically transmits electrical energy, specifically including the following steps: Step S021: The DC bidirectional electronic load acquires the real-time voltage value at a frequency of not less than 100Hz. And transmit it to the central controller; In this embodiment, a DC bidirectional electronic load samples the voltage of the DC series bus between the first bidirectional charger and the second bidirectional charger at a sampling frequency of not less than 100Hz to obtain the real-time voltage value of the DC series bus. The real-time voltage value collected at the end of each sampling period The data is transmitted to the central controller via the communication bus, and the central controller receives the real-time voltage value. It is temporarily stored in the internal storage unit for subsequent comparison operations.

[0040] Step S022: The central controller calculates the deviation. And determine the deviation. Size, and real-time voltage value With voltage fluctuation window Perform a comparison; In this embodiment, the central controller reads the real-time voltage value from the internal storage unit. Simultaneously, it reads the preset baseline value from the internal storage unit. and differential pressure safety threshold And calculate the real-time voltage value. Compared with the preset benchmark value The deviation amount, denoted as , deviation amount The calculation method is as follows The central controller will also measure the deviation. Temporarily stored in internal storage, while simultaneously calculating the lower boundary value of the voltage fluctuation window. With upper boundary value The voltage fluctuation window is obtained. Real-time voltage value With voltage fluctuation window Perform numerical comparisons to determine the real-time voltage value. Whether the voltage falls outside the voltage fluctuation window, is above the upper boundary value, or is below the lower boundary value is used for subsequent PID calculations.

[0041] Step S023: When and If the output voltage of the first bidirectional charger is too high, the central controller will control the DC bidirectional electronic load to operate in buck charging mode, in accordance with... Real-time calculated charging current The system absorbs the higher voltage from the DC series bus and supplies it to the DC bidirectional electronic load, thereby lowering the real-time voltage value. until The voltage drops back to within the voltage fluctuation window, where the charging current... The specific calculation formula is as follows: ,in This is the proportionality coefficient. The integral coefficient is... These are the differential coefficients; In this embodiment, the central controller reads the deviation from the internal storage unit. and real-time voltage value Simultaneously, the upper boundary value of the voltage fluctuation window is read from the internal storage unit. The central controller will measure the deviation. The sign of the voltage is compared with zero, and the real-time voltage value is... With the upper boundary value of the voltage fluctuation window Perform numerical comparisons, when the deviation... Greater than zero and real-time voltage value Greater than the upper boundary value of the voltage fluctuation window At this time, the central controller determines that the output voltage of the first bidirectional charger is too high, and then sends a step-down charging command to the DC bidirectional electronic load via the communication bus. In response to the step-down charging command, the DC bidirectional electronic load reads the deviation from its internal storage unit. And read the scaling factor from the internal storage unit. Integral coefficient and differential coefficients The central controller will display the absolute value of the deviation. Multiply by the proportionality factor The value of the proportional term is obtained, and the absolute value of the deviation is... Multiply the integral value over time by the integral coefficient The integral term is obtained, and the absolute value of the deviation is calculated. Multiply the differential value with respect to time by the differential coefficient The value of the differential term is obtained, and then the values ​​of the proportional term, integral term, and differential term are added together to obtain the charging current. The central controller will determine the final value of the charging current. The value is transmitted to the DC bidirectional electronic load via the communication bus. The DC bidirectional electronic load then adjusts the charging current accordingly. The system absorbs electrical energy from the higher-than-normal side of the DC series bus, converts this energy into DC current, and stores it inside the DC bidirectional electronic load, thereby lowering the real-time voltage of the DC series bus. The DC bidirectional electronic load continuously performs the above sampling and uploading operations, while the central controller continuously performs the above comparison and calculation operations until the real-time voltage value is reached. Falling back to Within the range.

[0042] Step S024: When and If the input voltage of the second bidirectional charger is too low, the central controller will control the DC bidirectional electronic load to operate in boost discharge mode, in accordance with... Discharge current calculated in real time The electrical energy stored in the DC bidirectional electronic load is released to the lower side of the DC series bus, thereby increasing the real-time voltage value. until The voltage rises back to within the voltage fluctuation window, where the discharge current... The specific calculation formula is as follows: ; In this embodiment, the central controller reads the deviation from the internal storage unit. and real-time voltage value Simultaneously, the lower boundary value of the voltage fluctuation window is read from the internal memory unit. The central controller will measure the deviation. The sign of the voltage is compared with zero, and the real-time voltage value is... With the lower boundary value of the voltage fluctuation window Perform numerical comparisons, when the deviation... Less than zero and real-time voltage value Less than the lower boundary value of the voltage fluctuation window If the input voltage of the second bidirectional charger is too low, a boost discharge command is sent to the DC bidirectional electronic load via the communication bus. In response to this boost discharge command, the central controller reads the deviation from its internal storage unit. And read the scaling factor from the internal storage unit. Integral coefficient and differential coefficients The final discharge current was calculated. numerical value The central controller will discharge the current. The value is transmitted to the DC bidirectional electronic load via the communication bus. The DC bidirectional electronic load then processes the received discharge current. The electrical energy stored inside the DC bidirectional electronic load is released to the lower side of the DC series bus, thereby raising the real-time voltage value of the DC series bus. The DC bidirectional electronic load continuously performs the above sampling and uploading operations, while the central controller continuously performs the above comparison and calculation operations until the real-time voltage value is reached. rebounded to Within the range.

[0043] Step S025: Continue executing steps S021 to S024 until the deviation is reached. When the static power consumption approaches zero, the DC bidirectional electronic load enters a standby state, maintaining only a very small static power consumption for monitoring. The changes.

[0044] In this embodiment, the central controller repeats steps S021 to S024 in each sampling cycle to continuously monitor the real-time voltage value. The relative position with respect to the voltage fluctuation window. When the deviation... When the absolute value decreases to near zero, it indicates the real-time voltage value. Falling into the voltage fluctuation window Within the specified range, the central controller determines that the DC series bus voltage has returned to a balanced state. The central controller then sends a standby hold command to the DC bidirectional electronic load via the communication bus. In response to this standby hold command, the DC bidirectional electronic load stops charging and discharging operations, maintaining only the lowest power consumption operation for voltage sampling and comparison calculations, continuously monitoring the real-time voltage value of the DC series bus with minimal static power consumption. The changes are recorded and uploaded to the central controller in real time. When the central controller detects the real-time voltage value... If the voltage fluctuation window is deviated from again, immediately exit the standby state and re-execute the voltage regulation operation from steps S022 to S024.

[0045] Furthermore, the central controller calculates the charging current. or discharge current Previously, the following steps were also included: Calculate the rate of change of the absolute value corresponding to the deviation. And determine if Decreasing and rate of change If the rate of change is less than a preset first threshold, the system is considered to be in a convergence state, and the central controller will adjust the differential coefficient. Adjusted to ,in It is the attenuation factor, and ;like It is increasing and the rate of change If the rate of change exceeds the preset second threshold, it is determined to be in a divergent state, and the central controller will adjust the proportional coefficient. Adjusted to ,in As an enhancing factor, and .

[0046] In this embodiment, the central controller calculates the charging current. or discharge current Previously, the deviation of the current sampling period was first obtained from the data uploaded by the DC bidirectional electronic load. The central controller calculates the absolute value of the deviation. rate of change and the calculated rate of change The deviation is temporarily stored in the internal storage unit, and the absolute value of the deviation is determined at the same time. Is the trend of change increasing or decreasing? When Decreasing and rate of change When the voltage is less than the preset first rate of change threshold, the central controller determines that the DC series bus voltage is in a convergence state, i.e., the real-time voltage value. Moving towards the preset baseline value Approach, Deviation The absolute value is decreasing. At this point, the central controller reads the original differential coefficients from the internal storage unit. and the differential coefficient Multiply by the attenuation factor Obtain the adjusted differential coefficients Attenuation factor The value is between zero and one. The central controller will adjust the differential coefficient. Write to internal storage unit, replacing the original differential coefficients. This is used for subsequent charging current. or discharge current PID calculation. By reducing the derivative coefficient The value of this parameter reduces the sensitivity of the derivative term to the rate of change of the deviation, thus avoiding excessive adjustment of the derivative term in the convergence state that could lead to changes in the real-time voltage value. At the preset benchmark value The repeated oscillations in the vicinity make the voltage regulation process smoother and more stable. When It is increasing and the rate of change When the voltage exceeds the preset second rate of change threshold, the central controller determines that the DC series bus voltage is in a divergent state, i.e., the real-time voltage value. It is accelerating its deviation from the preset benchmark value. , deviation amount The absolute value is increasing. At this point, the central controller reads the original proportional coefficient from the internal storage unit. and the proportionality coefficient Multiplied by the enhancement factor Obtain the adjusted scaling factor Enhancement factor The value is greater than one. The central controller will adjust the proportional coefficient. Write to the internal storage unit, replacing the original scaling factor. This is used for subsequent charging current. or discharge current PID calculation. By increasing the proportional coefficient The value of this parameter enhances the responsiveness of the proportional term to the current deviation, enabling the DC bidirectional electronic load to quickly suppress the real-time voltage value with a larger charging or discharging current. The deviation trend is monitored to prevent further expansion of the deviation and potential runaway of the DC series bus voltage. The central controller completes the differential coefficient... or proportionality coefficient After adjustment, substitute the adjusted coefficient into the charging current. or discharge current The corresponding charging current is obtained by performing calculations in the PID calculation formula. or discharge current The final value is obtained and sent to the DC bidirectional electronic load for execution via the communication bus. The central controller repeatedly performs the above-mentioned calculation of the rate of change of deviation, determination of convergence or divergence status, and dynamic adjustment of coefficients in each sampling cycle, so that the PID coefficients can adaptively change according to the actual fluctuation state of the DC series bus voltage, thereby improving the response speed and stability of voltage regulation.

[0047] The above description is merely an embodiment of the present invention and is not intended to limit the invention. Various modifications and variations can be made to the present invention by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principle of the present invention should be included within the scope of the claims of the present invention.

Claims

1. A dual-bidirectional power supply series-connected energy-saving aging test system, characterized in that, include: The mains-powered intelligent aging cabinet has an AC power output terminal; The first bidirectional charger has an AC input terminal and a DC output terminal; The AC input terminal is electrically connected to the AC power output terminal; The second bidirectional charger has a DC input terminal and an AC output terminal; the DC input terminal and the DC output terminal are electrically connected to form a DC series bus. An AC electronic load is electrically connected to both the AC output terminal and the mains-powered intelligent aging cabinet. A DC bidirectional electronic load has both DC and AC terminals; the DC terminals are connected in parallel to the DC series bus, and the AC terminals are electrically connected to the AC electronic load. The mains-powered intelligent aging cabinet also has a built-in grid-connected inverter module and a central controller; the grid-connected inverter module is electrically connected to the AC electronic load, and the central controller establishes communication connections with the first bidirectional charger, the second bidirectional charger, the AC electronic load, and the DC bidirectional electronic load respectively; the central controller controls the first bidirectional charger and the second bidirectional charger to automatically switch between charging aging mode and discharging aging mode. In charging aging mode, the central controller controls the AC power output terminal to output AC power, which is then transmitted to the first bidirectional charger via the AC input terminal. The first bidirectional charger rectifies the received AC power into DC power, which is then transmitted to the DC input terminal via the DC output terminal and then to the second bidirectional charger via the DC input terminal. The second bidirectional charger then uses the received DC power for charging aging. In discharging aging mode, the first and second bidirectional chargers are switched to inverter mode, allowing the electrical energy on the DC series bus to circulate internally between the first and second bidirectional chargers. The second bidirectional charger then inverts the received DC power into AC power, which is transmitted to the AC electronic load via the AC output terminal to simulate energy consumption. Excess energy that cannot be fully consumed flows partly to the DC bidirectional electronic load via the AC terminal for replenishment, and the other part flows to the grid-connected inverter module for inversion and then fed back to the mains intelligent aging cabinet.

2. The dual bidirectional power supply series-connected energy-saving aging test system according to claim 1, characterized in that, During power-on initialization, the central controller inputs the rated power, rated voltage, and rated current of the first and second bidirectional chargers, and sets the target charging / discharging voltage, target charging / discharging current, and charging duration per cycle. Discharge duration during a single operation Total number of loops and differential pressure safety threshold The central controller determines the duration of each charging cycle based on the charging time. and duration of single discharge operation The system performs alternating timing and generates a switching command when a switching node is reached to control the automatic switching between charging aging mode and discharging aging mode of the first bidirectional charger and the second bidirectional charger. The central controller also collects the voltage difference of the DC series bus, the voltage and current values ​​of each port of the first bidirectional charger and the second bidirectional charger, and the temperature value in real time through the communication bus, and packages them into an operation dataset. Each parameter in the operation dataset is compared with the corresponding preset safety threshold. When any parameter exceeds the preset safety threshold, a fault shutdown command is immediately generated to cut off the circuit, and the operation dataset at the time of the fault is locked before an alarm signal is output.

3. The dual bidirectional power supply series-connected energy-saving aging test system according to claim 2, characterized in that, The DC bidirectional electronic load monitors the real-time voltage value of the DC series bus. And compare them, when the real-time voltage value Higher than the preset benchmark value With differential pressure safety threshold When the sum of the values ​​is equal, it is determined that the output voltage of the first bidirectional charger is too high. The central controller then controls the DC bidirectional electronic load to operate in buck charging mode to match the output voltage of the charger. proportional charging current The system absorbs the higher voltage from the DC series bus and supplies it to the DC bidirectional electronic load, thereby lowering the real-time voltage value. When the real-time voltage value Below the preset benchmark value With differential pressure safety threshold If the input voltage of the second bidirectional charger is too low, the central controller will control the DC bidirectional electronic load to operate in boost discharge mode to match the output voltage. proportional discharge current The electrical energy stored in the DC bidirectional electronic load is released to the lower side of the DC series bus, thereby increasing the real-time voltage value. To obtain the real-time voltage value Dynamically maintained within the corresponding voltage fluctuation window Within this range, and to avoid circulating current in the DC series bus circuit.

4. The dual bidirectional power supply series-connected energy-saving aging test system according to claim 3, characterized in that, The central controller also adjusts the real-time voltage value. Compared with the preset benchmark value Corresponding deviation Real-time calculation of the absolute value of the charging current or discharge current Among them, the charging current or discharge current The specific calculation formula is as follows: or ,in This is the proportionality coefficient. The integral coefficient is... is the differential coefficient.

5. The dual bidirectional power supply series-connected energy-saving aging test system according to claim 1, characterized in that, When the first and second bidirectional chargers are in discharge aging mode, the AC electronic load receives load parameter instructions from the central controller, which include the target power consumption value. The system dynamically adjusts the equivalent impedance value of the AC electronic load according to load parameter commands to simulate the AC power consumed by the second bidirectional charger inverter at different power levels; the AC electronic load also provides real-time feedback on the current actual power consumption value. The data is then uploaded to the central controller, which will then record the target power consumption value. Compared with the current actual power consumption value If a comparison is made, Exceeding the preset power deviation threshold Then, the load parameter readjustment command is sent to the AC electronic load.

6. The dual bidirectional power supply series-connected energy-saving aging test system according to claim 2, characterized in that, While generating a fault shutdown command, the central controller also sends a discharge command to the DC bidirectional electronic load via the communication bus. In response to the discharge command, the DC bidirectional electronic load controls itself to operate in a fast discharge mode, releasing the electrical energy stored inside the DC bidirectional electronic load to the DC series bus at the maximum allowable discharge current. The energy is then inverted and transmitted to the AC electronic load via the second bidirectional charger until the stored electrical energy drops below the preset safe charge level. At this point, a discharge completion signal is generated and fed back to the central controller via the communication bus. After receiving the discharge completion signal from the DC bidirectional electronic load, the central controller executes the fault shutdown command to cut off the circuit.

7. A dual-power series-connected energy-saving aging test control method, characterized in that, The method, applied to the dual bidirectional power supply series energy-saving aging test system as described in any one of claims 1-6, includes the following steps: Step S01: The system is powered on and initialized. The central controller reads the rated parameters of the first and second bidirectional chargers and sets the target charging and discharging voltage, target charging and discharging current, and charging duration per cycle. Discharge duration during a single operation Total number of loops and differential pressure safety threshold ; Step S02: The central controller controls the first and second bidirectional chargers to be in charging aging mode, and controls the AC power output terminal to output AC power. The AC power is transmitted from the AC power output terminal to the AC input terminal, and then to the first bidirectional charger. The first bidirectional charger rectifies the received AC power into DC power, and transmits it from the DC output terminal along the DC series bus to the DC input terminal, and then to the second bidirectional charger. The second bidirectional charger performs charging aging on the received DC power, so that the first and second bidirectional chargers enter the charging aging condition simultaneously. Under the charging aging condition, the DC bidirectional electronic load continuously monitors the real-time voltage value. and based on Compared with the preset benchmark value The deviation amount dynamically feeds in electrical energy to maintain This eliminates the circulating current in the DC series bus circuit; Step S03: The central controller times and obtains the charging aging duration. When the charging aging duration reaches the duration of a single charging cycle... When the central controller determines that the operating condition switching conditions are met, it immediately issues a switching command to control the first bidirectional charger and the second bidirectional charger to switch to discharge aging mode simultaneously. Step S04: After entering the discharge aging mode, the central controller controls the first and second bidirectional chargers to switch to inverter mode, enabling the electrical energy on the DC series bus to circulate internally between the first and second bidirectional chargers. Then, the second bidirectional charger inverts the received DC power into AC power, which is transmitted to the AC electronic load via the AC output terminal to simulate energy consumption. Simultaneously, the DC bidirectional electronic load continuously performs the voltage dynamic balancing operation in step S02 to ensure the real-time voltage value... Always satisfied Excess electrical energy that cannot be fully consumed by the AC electronic load flows partly to the DC bidirectional electronic load through the AC terminal for replenishment, and the other part flows to the grid-connected inverter module for inversion and then fed back to the mains power intelligent aging cabinet. Step S05: The central controller times and obtains the discharge aging duration and the number of aging cycles. When the duration of discharge aging reaches the duration of a single discharge operation... ,and If the charging or discharging aging duration is zeroed, return to step S02 to execute the next round of charging aging; if At this time, the central controller will perform a shutdown operation.

8. The dual-bidirectional power supply series-connected energy-saving aging test control method according to claim 7, characterized in that, During the operation of steps S02 and S04, the central controller continuously monitors the DC series bus voltage difference, the voltage and current values ​​of each port of the first bidirectional charger and the second bidirectional charger, as well as the temperature value, and packages them into an operation dataset. When any parameter in the operation dataset exceeds the preset safety threshold, the central controller immediately generates a fault shutdown command to cut off the circuit, locks the operation dataset at the time of the fault, and outputs an alarm signal.

9. The dual-bidirectional power supply series-connected energy-saving aging test control method according to claim 7, characterized in that, The basis mentioned in step S02 Compared with the preset benchmark value The deviation amount dynamically transmits electrical energy, specifically including the following steps: Step S021: The DC bidirectional electronic load acquires the real-time voltage value at a frequency of not less than 100Hz. And transmit it to the central controller; Step S022: The central controller calculates the deviation. And determine the deviation. Size, and real-time voltage value With voltage fluctuation window Perform a comparison; Step S023: When and If the output voltage of the first bidirectional charger is too high, the central controller will control the DC bidirectional electronic load to operate in buck charging mode, in accordance with... Real-time calculated charging current The system absorbs the higher voltage from the DC series bus and supplies it to the DC bidirectional electronic load, thereby lowering the real-time voltage value. until The voltage drops back to within the voltage fluctuation window, where the charging current... The specific calculation formula is as follows: ,in This is the proportionality coefficient. The integral coefficient is... These are the differential coefficients; Step S024: When and If the input voltage of the second bidirectional charger is too low, the central controller will control the DC bidirectional electronic load to operate in boost discharge mode, in accordance with... Discharge current calculated in real time The electrical energy stored in the DC bidirectional electronic load is released to the lower side of the DC series bus, thereby increasing the real-time voltage value. until The voltage rises back to within the voltage fluctuation window, where the discharge current... The specific calculation formula is as follows: ; Step S025: Continue executing steps S021 to S024 until the deviation is reached. When the static power consumption approaches zero, the DC bidirectional electronic load enters a standby state, maintaining only a very small static power consumption for monitoring. The changes.

10. The dual-bidirectional power supply series-connected energy-saving aging test control method according to claim 9, characterized in that, The central controller calculates the charging current. or discharge current Previously, the following steps were also included: Calculate the rate of change of the absolute value corresponding to the deviation. And determine if Decreasing and rate of change If the rate of change is less than a preset first threshold, the system is considered to be in a convergence state, and the central controller will adjust the differential coefficient. Adjusted to ,in It is the attenuation factor, and ;like It is increasing and the rate of change If the rate of change exceeds the preset second threshold, it is determined to be in a divergent state, and the central controller will adjust the proportional coefficient. Adjusted to ,in As an enhancing factor, and .

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