A device for controlling and transmitting electric energy and a circuit control method

Abstract

The present invention discloses a device for controlling and transmitting electric energy and a circuit control method, comprising a main power supply, a rectifier, a bidirectional LLC resonant converter and an inverter connected in sequence, and a control system, wherein the output end of the rectifier is also connected to a backup power supply; the rectifier is used to convert the AC power from the main power supply into DC power and output it to the bidirectional LLC resonant converter, while replenishing electric energy for the backup power supply; the bidirectional LLC resonant converter is used to control the switching of the power supply mode of the main power supply or the backup power supply and keep the output voltage stable; the control system is used to control the switching process from the main power supply to the backup power supply mode. The present invention can quickly switch to the backup power supply to take over the power supply task when a power supply fails, use a prediction model to predict the time point when the main power supply may fail based on historical data and real-time data, prepare for the backup power supply switching in advance, and reduce the voltage and current fluctuations during power switching.

Description

Technical Field

[0001] The present invention relates to the technical field of resonant circuits, specifically to equipment used for conversion between AC and DC, or between DC and DC, and for use with a power supply or a similar power supply system, and more particularly to a device for controlling and transmitting electric energy and a circuit control method. Background Art

[0002] With the continuous development of power electronics technology, higher and higher requirements are put forward for the efficiency and stability of power control and transmission. Especially in key IT facilities such as data centers and server rooms, the stability and reliability of power supply are directly related to the integrity of data and the continuity of business. As an advanced power electronic converter, the bidirectional LLC resonant converter has the advantages of high efficiency, high power density and soft switching, and can realize the bidirectional flow of energy, so it shows great potential in many power applications.

[0003] However, although the bidirectional LLC resonant converter can achieve efficient power conversion and transmission in theory, in practical applications, especially in critical facilities such as data centers and server rooms, its performance is often affected by many factors. Among them, one of the most critical issues is the response speed and stability of the uninterrupted power supply to the load. After the main power supply is cut off, the time difference and voltage difference in the switching process of the backup power supply may cause instability in the load power supply, thereby affecting the normal operation of the entire system.

[0004] At present, although existing technologies have solved the problem of power conversion and transmission to a certain extent, it is often difficult to ensure the response speed and stability of uninterrupted power supply to the load when dealing with emergencies such as power outages of the main power supply. This may not only lead to data loss and equipment damage, but also have a serious impact on the entire business process.

[0005] Therefore, how to design and optimize a device and circuit control method for controlling and transmitting electric energy to ensure uninterrupted and stable power supply to the load in critical facilities such as data centers and server rooms even when the main power supply is cut off has become an urgent problem to be solved. Summary of the invention

[0006] The present invention overcomes the deficiencies of the prior art and provides a device for controlling and transmitting electric energy and a circuit control method.

[0007] To achieve the above object, the technical solution adopted by the present invention is: a device for controlling and transmitting electric energy, comprising a main power supply, a rectifier, a bidirectional LLC resonant converter and an inverter connected in sequence, and a control system, wherein the output end of the rectifier is also connected to a backup power supply, and the output end of the backup power supply is connected to the bidirectional LLC resonant converter;

[0008] The rectifier is used to convert the AC power from the main power supply into DC power and output it to the bidirectional LLC resonant converter, while supplementing the power for the backup power supply;

[0009] The bidirectional LLC resonant converter is used to control the switching of the power supply mode of the main power supply or the backup power supply and maintain the output voltage stable, and includes: a main resonant circuit and a high-speed static switch;

[0010] The inverter is used to convert the direct current from the bidirectional LLC resonant converter into alternating current for supplying to a load;

[0011] The control system is used to control the switching process from the main power supply mode to the backup power supply mode, including:

[0012] A monitoring module, used for collecting the operating parameters of the main power supply and the backup power supply in real time, the operating parameters including: voltage, current, frequency and waveform;

[0013] A prediction module, which uses a prediction model to predict a time point when the main power supply may fail in the future based on the historical operation data and real-time operation parameters of the main power supply;

[0014] A fault warning module, which issues a warning in advance according to the time point at which the main power supply may fail in the future as predicted by the prediction module;

[0015] The switching module sets a transition time according to the time point at which the main power supply may fail in the future predicted by the prediction module, and gradually adjusts the switching frequency and PWM duty cycle of the bidirectional LLC resonant converter within an adjustment period to complete a smooth switching from the main power supply to the backup power supply mode.

[0016] In a preferred embodiment of the present invention, the historical operation data of the main power supply includes: historical operation status and historical operation parameters, and corresponding timestamps, wherein the historical operation status is normal and fault status.

[0017] In a preferred embodiment of the present invention, the construction of the prediction model is specifically as follows:

[0018] Collect historical operation data of the main power supply, and divide the historical operation data into a training set and a test set;

[0019] Use multiple machine learning algorithms to build prediction models. Build multiple prediction models. Use training sets to train the prediction models separately. Input the main power supply operation parameters into the prediction models. The output of the prediction models is the time point when the main power supply may fail in the future.

[0020] Use the test set to test the trained prediction models, analyze the accuracy of the failure time points output by the prediction models, select the prediction model with the highest accuracy for cross-validation, and evaluate the accuracy and generalization ability of the prediction model;

[0021] According to the evaluation results of cross-validation, the learning rate or regularization coefficient of the prediction model is adjusted to improve the prediction accuracy. Then the test set is used to verify it, and the prediction model parameters are adjusted according to the verification results. After iterative optimization, the qualified prediction model is put into use.

[0022] In a preferred embodiment of the present invention, the control system also includes a waveform synchronization module, which controls the inverter to adjust its output waveform to be consistent with the main power supply output waveform parameters based on the main power supply output waveform monitored by the monitoring module.

[0023] In a preferred embodiment of the present invention, the control system is further provided with a voltage stabilization module, and the voltage stabilization module comprises: an auxiliary resonant circuit arranged in parallel with the main resonant circuit, and a calculation unit;

[0024] The monitoring module also monitors the output voltage fluctuation of the bidirectional LLC resonant converter during the backup power switching process, and controls the auxiliary resonant circuit to compensate the output voltage when the output voltage fluctuation exceeds a set threshold;

[0025] The calculation unit calculates a compensation value of the auxiliary resonant circuit according to an output voltage fluctuation value exceeding a threshold value;

[0026] The auxiliary resonant circuit includes: an adjustable resonant inductor, and an auxiliary switch connected in series at one end of the adjustable resonant inductor; when the output voltage fluctuation exceeds a set threshold, the auxiliary switch is started to turn on the auxiliary resonant circuit; the adjustable resonant inductor adjusts its inductance according to the compensation value output by the calculation unit, thereby fine-tuning the resonant frequency of the bidirectional LLC resonant converter and smoothing its voltage fluctuation.

[0027] In a preferred embodiment of the present invention, the control system further includes a recording module for recording, archiving and evaluating each power switching time.

[0028] A circuit control method for a device for controlling and transmitting electric energy based on any one of the above-mentioned methods comprises the following steps:

[0029] Step 1: Establish a parameter relationship model to determine the switching frequency and PWM duty cycle of the bidirectional LLC resonant converter after switching to the backup power supply mode according to the operating parameters of the backup power supply and the current load demand;

[0030] The load requirements include: power and voltage requirements of the load;

[0031] Step 2: according to the time point when the main power supply may fail in the future predicted by the prediction module, the transition time is set, and the adjustment strategy is formulated according to the total adjustment amount of the switching frequency and the PWM duty cycle, as well as the transition time;

[0032] Step 3: Implement the adjustment strategy to gradually adjust the working state of the bidirectional LLC resonant converter during the transition time until it is smoothly switched to the backup power supply mode.

[0033] In a preferred embodiment of the present invention, in step 1, the method for establishing the parameter relationship model comprises the following steps:

[0034] Preliminary test: Record the actual output power and voltage to the load under different operating parameters of the backup power supply and different settings of the switching frequency and PWM duty cycle of the bidirectional LLC resonant converter;

[0035] Model establishment: Based on the data from the previous test, statistical analysis is used to establish a relationship model between the operating parameters of the backup power supply, load demand, and the switching frequency and PWM duty cycle of the bidirectional LLC resonant converter.

[0036] In a preferred embodiment of the present invention, in step 2, the transition time is 10s to 60s, which is determined according to the remaining time between the current warning time and the fault time point, and the remaining time is from 5min to 0.5min, and the transition time is reduced proportionally;

[0037] The calculation formula of transition time is: Transition time , where T 留有 The remaining time from the warning time to the predicted main power failure time point;

[0038] The specific adjustment strategy is to set M switching frequency adjustments and N PWM duty cycle adjustments during the transition time. Then the adjustment amount each time is and The intervals between two consecutive adjustments are and ,in, is the switching frequency adjustment, is the PWM duty cycle adjustment, T 过渡 For transition time.

[0039] In a preferred embodiment of the present invention, the number of switching frequency adjustments M during the transition time is equal to the number of PWM duty cycle adjustments N. The transition time T 过渡 is 10s~20s, the value of M and N is 10; transition time T 过渡 21s~40s, the value of M and N is 15; transition time T 过渡It is 41s~60s, and the values ​​of M and N are 20.

[0040] The present invention solves the defects existing in the background technology and has the following beneficial effects:

[0041] (1) The present invention provides a device for controlling and transmitting electric energy and a circuit control method, wherein a main power supply, a backup power supply and a bidirectional LLC resonant converter are arranged in coordination, and the switching process from the main power supply to the backup power supply mode is coordinated and controlled by a control system. When the main power supply fails, the device can be quickly switched to the backup power supply to take over the power supply task, thereby avoiding equipment shutdown or data loss caused by power interruption. Furthermore, a prediction model is used to predict the time point when the main power supply may fail based on historical data and real-time data, so that preparations for switching the backup power supply are made in advance, reducing voltage and current fluctuations during power switching, and improving the reliability of power supply for data centers or servers.

[0042] (2) In the present invention, a prediction model is set up to predict the time point when the main power supply may fail in the future based on the historical operating data of the main power supply and the real-time operating parameters of the main power supply monitored by the monitoring module, so as to arrange countermeasures in advance and ensure that the device for controlling and transmitting electric energy of the present invention has a timely response to the failure of the main power supply, reduce the risk of voltage or current instability that occurs when an unexpected power outage or emergency switching to a backup power supply occurs due to a main power failure, and improve the reliability of the device for controlling and transmitting electric energy of the present invention.

[0043] (3) In the present invention, the setting of the switching module uses the prediction module to predict the failure of the main power supply. According to the predicted failure time point, the switching task is arranged in advance. Before the main power supply fails, by gradually adjusting the switching frequency and PWM duty cycle of the bidirectional LLC resonant converter, the change rate of the backup power supply output voltage during the switching transition time can be controlled, so that it can slowly and smoothly transition to the backup power supply mode. Compared with the direct switching of the backup power supply when a failure occurs in the prior art, the setting of the switching module of the present invention can effectively reduce the voltage fluctuation and impact during the switching process and protect the load equipment from damage.

[0044] (4) In the present invention, the voltage stabilization module is set to control the activation of the auxiliary resonant circuit when it is detected that the output voltage fluctuation exceeds the set threshold value during the switching of the power supply mode. By adjusting the inductance value of the adjustable resonant inductor, the resonant frequency and phase can be changed, thereby affecting the waveform of the output voltage, thereby offsetting or reducing the voltage fluctuation generated when the main power supply and the backup power supply are switched. BRIEF DESCRIPTION OF THE DRAWINGS

[0045] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art are briefly introduced below. Obviously, the drawings described below are only some embodiments recorded in the present invention. For those of ordinary skill in the art, other drawings can be obtained based on these drawings without creative work.

[0046] Figure 1 is a schematic diagram of the structure of a device for controlling and transmitting electric energy according to a preferred embodiment of the present invention;

[0047] Figure 2 It is a flow chart of a circuit control method according to a preferred embodiment of the present invention. DETAILED DESCRIPTION

[0048] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0049] In the following description, many specific details are set forth to facilitate a full understanding of the present invention, but the present invention may also be implemented in other ways different from those described herein. Therefore, the protection scope of the present invention is not limited to the specific embodiments disclosed below.

[0050] In the description of this application, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium, and it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood by specific circumstances.

[0051] like Figure 1 As shown, the present invention provides a device for controlling and transmitting electric energy, including a main power supply, a rectifier, a bidirectional LLC resonant converter and an inverter connected in sequence, and a control system; the output end of the rectifier is also connected to a backup power supply, and the output end of the backup power supply is connected to the bidirectional LLC resonant converter.

[0052] It is worth mentioning that the main power source is AC power and the backup power source is a battery pack.

[0053] The rectifier is connected to the main power supply and is used to convert the alternating current (AC) from the main power supply into direct current (DC) and output it to the bidirectional LLC resonant converter, while supplementing power for the backup power supply.

[0054] A bidirectional LLC resonant converter is used to control the switching of the power supply mode of the main power supply or the backup power supply and maintain a stable output voltage. The bidirectional LLC resonant converter includes: a main resonant circuit and a high-speed static switch. The main resonant circuit is composed of an inductor, a capacitor and a transformer. These components resonate at a specific operating frequency to achieve the conversion and transmission of electric energy. This is a prior art and will not be described in detail. The high-speed static switch preferably uses MOSFETs or IGBTs. High-speed MOSFETs and IGBTs can switch from the on state to the off state in a very short time, thereby achieving fast and seamless switching between the main power supply mode and the backup power supply mode.

[0055] Main power supply mode: The rectifier and bidirectional LLC resonant converter adjust the voltage and current, allowing the inverter to output stable AC power to the load.

[0056] Backup power supply mode: The bidirectional LLC resonant converter responds quickly, receives DC power from the battery pack, and converts it into AC power through the inverter to ensure uninterrupted power supply to the load.

[0057] The inverter is connected to the output end of the bidirectional LLC resonant converter and is used to convert the direct current from the bidirectional LLC resonant converter into alternating current for supplying to the load. The load in the present invention is specifically a data center or a server.

[0058] Furthermore, the bidirectional LLC resonant converter achieves a constant output voltage through the resonant frequency of the main resonant circuit, thereby providing a stable power source for the inverter.

[0059] Furthermore, in the main power supply mode, the rectifier will continue to charge the backup power supply to ensure that the backup power supply has sufficient power.

[0060] The control system in this embodiment is used to control the switching process from the main power supply mode to the backup power supply mode, including:

[0061] The monitoring module is used to collect the operating parameters of the main power supply and the backup power supply in real time. The operating parameters include: voltage, current, frequency and waveform. The monitoring module includes: voltage sensor, current sensor and frequency meter, which are connected to the main power supply and the backup power supply respectively, collect the operating parameters of the main power supply and the backup power supply in real time, and convert the analog signal of the sensor into a digital signal through the data acquisition system (DAQ), and transmit the data to the waveform synchronization module and the prediction module through the RS-232 interface for further analysis.

[0062] The prediction module uses the prediction model to predict the time point when the main power supply may fail in the future based on the historical operation data and real-time operation parameters of the main power supply. It is worth noting that the historical operation data includes: the historical operation status and historical operation parameters of the main power supply, as well as the corresponding timestamps. The historical operation status is normal and faulty. Furthermore, the origin of the historical operation data is: the accumulated data of the monitoring module on the current device, and the import of historical operation data of devices of the same scale and model.

[0063] The construction of the prediction model includes the following steps:

[0064] Step 1: Collect the historical operation data of the main power supply, and divide the historical operation data into a training set and a test set. Further, preprocess the collected historical operation data, including: data cleaning and data conversion. Data cleaning processes missing values ​​and outliers in the historical operation data, and data conversion uses normalization and standardization to eliminate the influence of different dimensions in the historical operation data.

[0065] Step 2: Use a variety of machine learning algorithms to build prediction models, such as time series analysis, support vector machine (SVM), random forest and deep learning network, etc., build multiple prediction models, use training sets to train the prediction models separately, input the main power supply operating parameters into the prediction model, and the output of the prediction model is the time point when the main power supply may fail in the future.

[0066] Step 3: Use the test set to test the trained prediction models respectively, analyze the accuracy of the fault time points output by the prediction models, select the prediction model with the highest accuracy for cross-validation, and evaluate the accuracy and generalization ability of the prediction model.

[0067] Step 4: According to the evaluation results of cross-validation, adjust the learning rate or regularization coefficient of the prediction model to improve the prediction accuracy, and then use the test set to verify it. Adjust the prediction model parameters according to the verification results, iterate and optimize until the set accuracy threshold is reached, and put the qualified prediction model into use.

[0068] In the present invention, a prediction model is set up to predict the time point when the main power supply may fail in the future based on the historical operating data of the main power supply and the real-time operating parameters of the main power supply monitored by the monitoring module, so as to arrange countermeasures in advance and ensure that the device for controlling and transmitting electric energy of the present invention has a timely response to the main power supply failure, reduce the risk of voltage or current instability during unexpected power outages or emergency switching of the backup power supply due to main power supply failure, and improve the reliability of the device for controlling and transmitting electric energy of the present invention.

[0069] The fault warning module issues a warning in advance based on the time point at which the main power supply may fail in the future as predicted by the prediction model. It is worth noting that when the time left between the current and the fault time point is greater than five minutes, a warning is issued five minutes before the fault time point, and when the time left is less than or equal to five minutes, a warning is issued immediately. The fault warning module sends warning information to the administrator or maintenance personnel through sound and light alarms and network notifications. In the fault warning module, the time setting is left to reduce false alarm warning information or cancel the issuance of warning information, which makes the administrator or maintenance personnel receive complicated warning information and affects their judgment ability.

[0070] In the present invention, the setting of the fault warning module can accurately and promptly notify the administrator or maintenance personnel to take corresponding countermeasures, which helps to reduce the risk of business interruption and data loss caused by power supply failure or voltage or current instability during emergency switching of backup power supply.

[0071] The switching module sets the transition time according to the time point when the main power supply may fail in the future predicted by the prediction module, and gradually adjusts the switching frequency and PWM duty cycle of the bidirectional LLC resonant converter within the adjustment period to complete the smooth switching from the main power supply mode to the backup power supply mode.

[0072] like Figure 2 As shown, a circuit control method of a device for controlling and transmitting electric energy is used for a switching module to control a smooth switch from a main power supply mode to a backup power supply mode, comprising the following steps:

[0073] Step 1: Establish a parameter relationship model to determine the switching frequency and PWM duty cycle of the bidirectional LLC resonant converter after switching to the backup power supply mode according to the operating parameters of the backup power supply and the current load demand.

[0074] The load requirements include: power and voltage requirements of the load.

[0075] In step 1, the method for establishing the parameter relationship model includes the following steps:

[0076] Preliminary test: Under different operating parameters of the backup power supply, and different settings of the switching frequency and PWM duty cycle of the bidirectional LLC resonant converter, record the actual output power and voltage to the load.

[0077] Model establishment: Based on the data from the previous test, statistical analysis is used to establish a relationship model between the operating parameters of the backup power supply, load demand, and the switching frequency and PWM duty cycle of the bidirectional LLC resonant converter.

[0078] Step 2: According to the time point when the main power supply may fail in the future predicted by the prediction module, the transition time is set. According to the total adjustment amount of the switching frequency and PWM duty cycle, as well as the transition time, an adjustment strategy is formulated while ensuring the voltage stability during the transition time. The adjustment strategy includes: the number of adjustments, the adjustment amount each time, and the interval time between two adjacent adjustments.

[0079] Furthermore, the transition time is 10s to 60s, which is determined by the remaining time between the current warning time and the fault time point. The remaining time is from 5min to 0.5min, and the transition time is reduced proportionally. Furthermore, the calculation formula of the transition time is: Transition time , where T 留有 It is the remaining time from the warning time to the predicted main power failure time.

[0080] Furthermore, the adjustment strategy is specifically to set M switching frequency adjustments and N PWM duty cycle adjustments during the transition time, so the adjustment amount each time is and The intervals between two consecutive adjustments are and ,in, is the switching frequency adjustment, is the PWM duty cycle adjustment.

[0081] Furthermore, the number of switching frequency adjustments M during the transition time is equal to the number of PWM duty cycle adjustments N. The values ​​of M and N are determined by flexibly adjusting the values ​​of M and N according to the specific conditions of the system (such as load characteristics, converter performance, stability requirements, etc.). In this embodiment, the transition time T 过渡 is 10s~20s, the value of M and N is 10; transition time T 过渡 21s~40s, the value of M and N is 15; transition time T 过渡 It is 41s to 60s, and the values ​​of M and N are 20. The longer the transition time is, the more times the switching frequency and PWM duty cycle are adjusted, and the more stable the adjustment process is.

[0082] Step 3: Implement the adjustment strategy to gradually adjust the working state of the bidirectional LLC resonant converter during the transition time until it is smoothly switched to the backup power supply mode.

[0083] It is worth noting that if an emergency occurs, such as an unexpected city power outage that was not predicted, a high-speed static switch is used to quickly switch from the main power supply mode to the backup power supply mode. The switching time of the high-speed static switch is at the microsecond level, reducing voltage interruptions or fluctuations during the switching process.

[0084] In the present invention, the setting of the switching module uses the prediction module to predict the failure of the main power supply, and the switching task is arranged in advance according to the predicted failure time point. Before the failure of the main power supply, by gradually adjusting the switching frequency and PWM duty cycle of the bidirectional LLC resonant converter, the rate of change of the output voltage of the backup power supply during the switching transition time can be controlled, so that it can slowly and smoothly transition to the backup power supply mode. Compared with the direct switching of the backup power supply during a failure in the prior art, the setting of the switching module of the present invention can effectively reduce the voltage fluctuation and impact during the switching process, and protect the load equipment from damage.

[0085] In this embodiment, the control system also includes a waveform synchronization module, which controls the inverter to adjust its output waveform according to the main power supply output waveform monitored by the monitoring module, so as to be consistent with the output waveform parameters of the main power supply, thereby realizing synchronization between the inverter and the main power supply. The inverter is equipped with a sine wave inverter power supply system based on a digital PID control algorithm, which adjusts the AC waveform output by the inverter according to the output waveform of the main power supply. In the present invention, the waveform synchronization module provided can reduce power supply fluctuations and noise by synchronizing the output waveform, and provide a more stable power output.

[0086] In this embodiment, the control system is further provided with a voltage stabilization module, which includes: an auxiliary resonant circuit arranged in parallel with the main resonant circuit, and a calculation unit. The monitoring module also monitors the output voltage fluctuation of the bidirectional LLC resonant converter during the backup power switching process, and when the output voltage fluctuation exceeds the set threshold value ±5%, the auxiliary resonant circuit is controlled to compensate the output voltage.

[0087] The calculation unit calculates the compensation value of the auxiliary resonant circuit according to the output voltage fluctuation value exceeding the threshold. Specifically, the compensation value ,in, is the fluctuation of the output voltage, is the rated output voltage, is the inductance value of the main resonant circuit, and this compensation value is used to control the inductance compensation of the auxiliary resonant circuit.

[0088] The auxiliary resonant circuit includes: an adjustable resonant inductor and an auxiliary switch connected in series at one end of the adjustable resonant inductor; when the output voltage fluctuation exceeds the set threshold, the auxiliary switch is started to turn on the auxiliary resonant circuit; and the adjustable resonant inductor is based on the compensation value output by the calculation unit. , adjust its inductance, and then fine-tune the resonant frequency of the bidirectional LLC resonant converter to smooth its voltage fluctuations. Further, the adjustable resonant inductor is preferably a variable inductor based on electronic control, such as Coilcraft's Uni series adjustable RF inductors. In the present invention, the auxiliary resonant circuit can change its resonant frequency and phase, and work in conjunction with the main resonant circuit to offset or reduce voltage fluctuations.

[0089] In the present invention, the voltage stabilization module is set up, when the power supply mode is switched, when it is detected that the output voltage fluctuation exceeds the set threshold, the auxiliary resonant circuit is controlled to be activated, and the resonant frequency and phase can be changed by adjusting the inductance value of the adjustable resonant inductor, thereby affecting the waveform of the output voltage, thereby offsetting or reducing the voltage fluctuation generated when the main power supply and the backup power supply are switched.

[0090] In this embodiment, the control system also includes a recording module for recording, archiving and evaluating each power switching time, providing more historical operation data for the prediction module, and improving the prediction accuracy of the prediction module.

[0091] After each fast switching mechanism is completed, the monitoring module continuously collects the operating parameters of the main power supply and the backup power supply, records the switching events, and prepares to deal with the next possible failure.

[0092] The operating parameters of the main power supply and backup power supply are collected using the monitoring module, and a database is set up to store the collected data and event logs; the event log is used to mark and record key time points, state changes, and related parameters when power switching occurs. Predictive models are used to evaluate recorded events, identify patterns, predict failure trends, and provide a basis for optimizing system performance.

[0093] The recording module provided in the present invention can quickly diagnose the cause of system failure by recording and analyzing power switching events, thereby speeding up the repair and recovery process. It can also be used as historical data to provide prediction models for training, helping to predict possible failures and maintenance needs, implement predictive maintenance, and reduce unexpected downtime.

[0094] The above is based on the ideal embodiment of the present invention. Through the above description, relevant personnel can make various changes and modifications without departing from the technical concept of the present invention. The technical scope of the present invention is not limited to the content in the specification, and the technical scope must be determined according to the scope of the claims.

Claims

1. A device for controlling and transmitting electric energy, comprising a main power supply, a rectifier, a bidirectional LLC resonant converter and an inverter connected in sequence, and a control system, characterized in that: The output end of the rectifier is also connected to a backup power supply, and the output end of the backup power supply is connected to the bidirectional LLC resonant converter; The rectifier is used to convert the AC power from the main power supply into DC power and output it to the bidirectional LLC resonant converter, while supplementing the power for the backup power supply; The bidirectional LLC resonant converter is used to control the switching of the power supply mode of the main power supply or the backup power supply and maintain the output voltage stable, and includes: a main resonant circuit and a high-speed static switch; The inverter is used to convert the direct current from the bidirectional LLC resonant converter into alternating current for supplying to a load; The control system is used to control the switching process from the main power supply mode to the backup power supply mode, including: A monitoring module, used for collecting the operating parameters of the main power supply and the backup power supply in real time, the operating parameters including: voltage, current, frequency and waveform; A prediction module, which uses a prediction model to predict a time point when the main power supply may fail in the future based on the historical operation data and real-time operation parameters of the main power supply; A fault warning module, which issues a warning in advance according to the time point at which the main power supply may fail in the future as predicted by the prediction module; A switching module, which sets a transition time according to a time point at which the main power supply may fail in the future predicted by the prediction module, and gradually adjusts the switching frequency and PWM duty cycle of the bidirectional LLC resonant converter within an adjustment period to complete a smooth switching from the main power supply to the backup power supply mode; The control system is further provided with a voltage stabilization module, which includes: an auxiliary resonant circuit arranged in parallel with the main resonant circuit, and a calculation unit; The monitoring module also monitors the output voltage fluctuation of the bidirectional LLC resonant converter during the backup power switching process, and controls the auxiliary resonant circuit to compensate the output voltage when the output voltage fluctuation exceeds a set threshold; The calculation unit calculates a compensation value of the auxiliary resonant circuit according to an output voltage fluctuation value exceeding a threshold value; The auxiliary resonant circuit includes: an adjustable resonant inductor, and an auxiliary switch connected in series at one end of the adjustable resonant inductor; when the output voltage fluctuation exceeds a set threshold, the auxiliary switch is started to turn on the auxiliary resonant circuit; the adjustable resonant inductor adjusts its inductance according to the compensation value output by the calculation unit, thereby fine-tuning the resonant frequency of the bidirectional LLC resonant converter and smoothing its voltage fluctuation.

2. A device for controlling and transmitting electric energy according to claim 1, characterized in that: The historical operation data of the main power supply includes: historical operation status and historical operation parameters, and corresponding timestamps, wherein the historical operation status is a normal state and a fault state.

3. The device for controlling and transmitting electric energy according to claim 1, characterized in that: The construction of the prediction model is specifically as follows: Collect historical operation data of the main power supply, and divide the historical operation data into a training set and a test set; Use multiple machine learning algorithms to build prediction models. Build multiple prediction models. Use training sets to train the prediction models separately. Input the main power supply operation parameters into the prediction models. The output of the prediction models is the time point when the main power supply may fail in the future. Use the test set to test the trained prediction models, analyze the accuracy of the failure time points output by the prediction models, select the prediction model with the highest accuracy for cross-validation, and evaluate the accuracy and generalization ability of the prediction model; According to the evaluation results of cross-validation, the learning rate or regularization coefficient of the prediction model is adjusted to improve the prediction accuracy, and then the test set is used to verify it. According to the verification results, the prediction model parameters are adjusted, optimized iteratively, and the qualified prediction model is put into use.

4. The device for controlling and transmitting electric energy according to claim 1, characterized in that: The control system also includes a waveform synchronization module, which controls the inverter to adjust its output waveform to be consistent with the output waveform parameters of the main power supply according to the output waveform of the main power supply monitored by the monitoring module.

5. The device for controlling and transmitting electric energy according to claim 1, characterized in that: The control system also includes a recording module for recording, archiving and evaluating each power switching time.

6. A circuit control method for a device for controlling and transmitting electric energy according to any one of claims 1 to 5, characterized in that: The following steps are involved: Step 1: Establish a parameter relationship model to determine the switching frequency and PWM duty cycle of the bidirectional LLC resonant converter after switching to the backup power supply mode according to the operating parameters of the backup power supply and the current load demand; The load requirements include: power and voltage requirements of the load; Step 2: according to the time point when the main power supply may fail in the future predicted by the prediction module, the transition time is set, and the adjustment strategy is formulated according to the total adjustment amount of the switching frequency and the PWM duty cycle, as well as the transition time; Step 3: Implement the adjustment strategy to gradually adjust the working state of the bidirectional LLC resonant converter during the transition time until it is smoothly switched to the backup power supply mode.

7. The circuit control method of a device for controlling and transmitting electric energy according to claim 6, characterized in that: In the step 1, the method for establishing the parameter relationship model includes the following steps: Preliminary test: Record the actual output power and voltage to the load under different operating parameters of the backup power supply and different settings of the switching frequency and PWM duty cycle of the bidirectional LLC resonant converter; Model establishment: Based on the data from the previous test, statistical analysis is used to establish a relationship model between the operating parameters of the backup power supply, load demand, and the switching frequency and PWM duty cycle of the bidirectional LLC resonant converter.

8. The circuit control method of a device for controlling and transmitting electric energy according to claim 6, characterized in that: In the step 2, the transition time is 10s to 60s, which is determined according to the remaining time between the current warning time and the fault time point. The remaining time is from 5min to 0.5min, and the transition time is reduced proportionally; The calculation formula of transition time is: Transition time , where T 留有 The remaining time from the warning time to the predicted main power failure time point; The specific adjustment strategy is to set M switching frequency adjustments and N PWM duty cycle adjustments during the transition time. Then the adjustment amount each time is and The intervals between two consecutive adjustments are and ,in, is the switching frequency adjustment, is the PWM duty cycle adjustment, T 过渡 For transition time.

9. The circuit control method of a device for controlling and transmitting electric energy according to claim 8, characterized in that: The number of switching frequency adjustments M during the transition time is equal to the number of PWM duty cycle adjustments N. The transition time T 过渡 is 10s~20s, the value of M and N is 10; transition time T 过渡 21s~40s, the value of M and N is 15; transition time T 过渡 It is 41s~60s, and the values ​​of M and N are 20.

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