A control method and system for seamless switching of power modules

Abstract

The present invention discloses a control method and system for seamless switching of a power module, the method comprising: obtaining the current output voltage of a power module in a low-voltage distribution network, and monitoring the voltage distortion of the power module; if the power module has voltage distortion and the distortion degree exceeds a preset threshold, determining the power module as a module to be switched; obtaining the current load parameters, and determining the target module to be switched from the standby power module according to the load parameters; determining the control parameters of the target module based on a preset control parameter library, and pre-adjusting the target module; switching the module to be switched to an offline state, and switching the target module to a running state at the same time; obtaining the current output voltage of the target module, performing transient response evaluation on the target module, and correcting the control parameters of the target module according to the evaluation results. The present invention can realize intelligent seamless switching of the power module when voltage distortion occurs, and improve the power supply reliability of the low-voltage distribution network.

Description

Technical Field

[0001] The present invention relates to the technical field of power distribution networks, and in particular to a control method and system for seamless switching of power modules. Background Art

[0002] In low-voltage distribution networks, with the increasing demand for flexibility and reliability, the application of standardized power modules has gradually become an important means to improve system performance. This modular design not only enables plug-and-play of power units, but also enables dynamic switching and fault recovery under different load conditions. However, during the switching process, power modules often face problems such as transient shocks and voltage fluctuations, resulting in poor voltage stability of existing power modules during the switching process. Summary of the invention

[0003] To solve the above technical problems, the present invention provides a control method and system for seamless switching of power modules, which can realize intelligent seamless switching of power modules when voltage distortion occurs, thereby improving the power supply reliability and power quality of the low-voltage distribution network.

[0004] An embodiment of the present invention provides a control method for seamless switching of a power module, comprising:

[0005] Obtaining a first voltage currently output by a power module in a low-voltage distribution network;

[0006] According to the first voltage, the voltage distortion of the power module is monitored; if the voltage distortion of the power module occurs and the distortion degree exceeds a preset threshold, the power module is determined to be a module to be switched;

[0007] Acquire current load parameters, and determine a target module to be switched from the standby power modules according to the load parameters;

[0008] Determining control parameters of the target module based on a preset control parameter library, and pre-adjusting the target module according to the control parameters;

[0009] Switch the module to be switched to an offline state, and switch the target module to a running state;

[0010] Acquire a second voltage currently output by the target module; perform transient response evaluation on the target module according to the second voltage to obtain an evaluation result, and modify a control parameter of the target module according to the evaluation result.

[0011] As an improvement of the above solution, the voltage distortion monitoring of the power module is performed according to the first voltage; if the voltage distortion occurs in the power module and the distortion degree exceeds a preset threshold, the power module is determined to be a module to be switched, including:

[0012] Calculating a root mean square deviation value between the first voltage and a rated voltage of the power module;

[0013] If the RMS deviation value is greater than a preset first distortion threshold, it is determined that voltage distortion occurs in the power module;

[0014] If the duration of voltage distortion in the power module is greater than a preset duration, or the root mean square deviation value is greater than a preset second distortion threshold, the power module is determined as a module to be switched; the second distortion threshold is greater than the first distortion threshold.

[0015] As an improvement of the above solution, the step of determining the target module to be switched from the standby power modules according to the load parameters includes:

[0016] Determining the capacity requirement of the target module according to the load parameters;

[0017] In a preset backup module database, a backup power module that meets the capacity requirement is screened to obtain a preliminary screening result;

[0018] Acquire the status parameters of each standby power module in the preliminary screening result from the standby module database; the status parameters include: cumulative operation time, historical switching success rate and number of temperature limit violations;

[0019] Based on the state parameters of the standby power modules, each standby power module in the preliminary screening result is comprehensively scored, and the standby power module with the highest comprehensive score is determined as the target module to be switched.

[0020] As an improvement of the above solution, the step of determining the control parameters of the target module based on a preset control parameter library includes:

[0021] Acquire dynamic response data of the target module; the dynamic response data includes voltage values ​​at a rising time point, a peak time point, and a stable time point; the dynamic response data is historical dynamic response data or predicted dynamic response data;

[0022] Based on a preset control parameter library, control parameter matching is performed according to the dynamic response data to obtain the control parameters of the target module; the control parameter library stores a mapping relationship between dynamic response data and control parameters; the control parameters include proportional coefficient, integral time and differential time.

[0023] As an improvement of the above solution, the step of switching the module to be switched to an offline state and simultaneously switching the target module to a running state includes:

[0024] Sending control instructions to the module to be switched and the target module at the same time;

[0025] According to the control instruction, starting the soft shutdown procedure of the module to be switched, so that the output voltage of the module to be switched decreases at a preset rate;

[0026] According to the control instruction, the target module is enabled and the output voltage of the target module is detected. When the output voltage of the target module is greater than a preset voltage threshold and the voltage change rate is less than a preset change rate threshold, a switching enable signal is generated to enable the target module to start running with load.

[0027] As an improvement of the above solution, the step of evaluating the transient response of the target module according to the second voltage to obtain an evaluation result, and correcting the control parameters of the target module according to the evaluation result includes:

[0028] According to the second voltage, obtaining the rise time, peak overshoot and oscillation frequency of the transient voltage;

[0029] Obtaining a transient response score according to a weighted sum of the rise time, the peak overshoot and the oscillation frequency;

[0030] If the transient response score is less than the preset score threshold, the control parameter of the target module is corrected by progressive fine-tuning until the transient response score corresponding to the corrected control parameter is not less than the preset score threshold, and the control parameter is determined.

[0031] As an improvement of the above solution, after modifying the control parameters of the target module according to the evaluation result, the method further includes:

[0032] The corrected control parameters are stored in the control parameter library to serve as reference parameters when the standby power module is started next time.

[0033] The embodiment of the present invention further provides a control system for seamless switching of a power module, comprising:

[0034] A module voltage acquisition module, used to obtain a first voltage currently output by a power module in a low-voltage distribution network;

[0035] A voltage distortion monitoring module, configured to monitor voltage distortion of the power module according to the first voltage; if voltage distortion occurs in the power module and the degree of distortion exceeds a preset threshold, the power module is determined to be a module to be switched;

[0036] A target module determination module, used to obtain current load parameters and determine a target module to be switched from the standby power modules according to the load parameters;

[0037] A parameter pre-adjustment module, used to determine the control parameters of the target module based on a preset control parameter library, and pre-adjust the target module according to the control parameters;

[0038] A power module switching module, used to switch the module to be switched to an offline state and simultaneously switch the target module to a running state;

[0039] The control parameter correction module is used to obtain a second voltage currently output by the target module; perform transient response evaluation on the target module according to the second voltage to obtain an evaluation result, and correct the control parameters of the target module according to the evaluation result.

[0040] Furthermore, the voltage distortion monitoring module is specifically used for:

[0041] Calculating a root mean square deviation value between the first voltage and a rated voltage of the power module;

[0042] If the RMS deviation value is greater than a preset first distortion threshold, it is determined that voltage distortion occurs in the power module;

[0043] If the duration of voltage distortion in the power module is greater than a preset duration, or the root mean square deviation value is greater than a preset second distortion threshold, the power module is determined as a module to be switched; the second distortion threshold is greater than the first distortion threshold.

[0044] Furthermore, the target module determination module is specifically used for:

[0045] Determining the capacity requirement of the target module according to the load parameters;

[0046] In a preset backup module database, a backup power module that meets the capacity requirement is screened to obtain a preliminary screening result;

[0047] Acquire the status parameters of each standby power module in the preliminary screening result from the standby module database; the status parameters include: cumulative operation time, historical switching success rate and number of temperature limit violations;

[0048] Based on the state parameters of the standby power modules, each standby power module in the preliminary screening result is comprehensively scored, and the standby power module with the highest comprehensive score is determined as the target module to be switched.

[0049] Compared with the prior art, the beneficial effects of a control method and system for seamless switching of power modules provided by an embodiment of the present invention are as follows: by detecting the voltage distortion of the power module and triggering switching when the voltage distortion exceeds a threshold, the faulty or abnormally operating power module can be identified in time to ensure the stability of the system. At the same time, a backup module is selected and its control parameters are pre-adjusted, which reduces the transient response of the power module during the switching process, realizes seamless switching of the power module, and improves the switching efficiency and stability; by combining the capacity requirements and historical state parameters of the module to select the target module for switching, the reliability of the selected target module is guaranteed; by automatically matching the control parameters in the control parameter library based on the dynamic response data of the target module, the control parameters of the target module are pre-adjusted, and the stability and response speed of the module during switching are improved; by evaluating the transient response of the target module and then fine-tuning the control parameters, the stable operation of the module after the module switching can be ensured, thereby optimizing the dynamic response performance of the module, reducing unnecessary transient fluctuations, and improving the response speed and accuracy of the power module. The embodiments of the present invention can improve the stability, reliability and efficiency of the power module switching process, realize seamless switching, effectively reduce transient impacts, and improve system performance and fault recovery capabilities. BRIEF DESCRIPTION OF THE DRAWINGS

[0050] Figure 1 It is a flow chart of a control method for seamless switching of a power module provided by an embodiment of the present invention;

[0051] Figure 2 It is a structural schematic diagram of a control system for seamless switching of power modules provided in an embodiment of the present invention. DETAILED DESCRIPTION

[0052] 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.

[0053] See also Figure 1 , Figure 1 The present invention provides a flow chart of a control method for seamless switching of a power module. The control method for seamless switching of a power module includes:

[0054] S1: Obtaining a first voltage currently output by a power module in a low-voltage distribution network;

[0055] Specifically, the operating status data of each standardized power module in the low-voltage distribution network is acquired in real time through the data acquisition unit, and the operating status data includes output voltage and output current.

[0056] S2: monitoring the voltage distortion of the power module according to the first voltage; if the voltage distortion occurs in the power module and the distortion degree exceeds a preset threshold, determining that the power module is a module to be switched;

[0057] Further, the voltage distortion monitoring of the power module is performed according to the first voltage; if the voltage distortion occurs in the power module and the distortion degree exceeds a preset threshold, the power module is determined to be a module to be switched, including:

[0058] Calculating a root mean square deviation value between the first voltage and a rated voltage of the power module;

[0059] If the RMS deviation value is greater than a preset first distortion threshold, it is determined that voltage distortion occurs in the power module;

[0060] If the duration of voltage distortion in the power module is greater than a preset duration, or the root mean square deviation value is greater than a preset second distortion threshold, the power module is determined as a module to be switched; the second distortion threshold is greater than the first distortion threshold.

[0061] Specifically, for each power module in working state, based on the output voltage signal of the power module collected, the root mean square deviation value of the voltage signal is calculated within a 20ms sliding time window; if the root mean square deviation value is greater than the nominal value of 0.05 (i.e., the first distortion threshold), it is determined that the power module has voltage distortion, and the distortion occurrence time and voltage waveform data are recorded to form a distortion record file; the duration of voltage distortion is obtained according to the distortion record file. If the duration exceeds 100ms or the single root mean square deviation value exceeds the nominal value of 0.1 (i.e., the second distortion threshold), it is determined that the power module has a fault and needs to be switched. Among them, the calculation of the voltage root mean square deviation is monitored in real time through a sliding window, and the window length of 20ms corresponds to the power frequency cycle, which can accurately reflect the voltage distortion. In industrial power supply, for a distribution system with a rated voltage of 380V, a distortion threshold of 0.05 corresponds to a deviation tolerance of 19V, which meets the low-voltage distribution quality standard. Voltage distortion exceeding 100ms usually indicates that the fault is non-transient and module switching is required. The nominal value of 0.1 corresponds to a deviation of 38V, which is a serious distortion and requires module switching.

[0062] The embodiment of the present invention monitors the voltage distortion of the first voltage of the power module and calculates the root mean square deviation value, so as to more accurately determine whether the module has voltage distortion, and determine whether the power module needs to be switched according to the degree and duration of the distortion, thereby effectively avoiding judgment based on a single indicator of voltage value and improving the accuracy and reliability of the judgment.

[0063] S3: obtaining current load parameters, and determining a target module to be switched from the standby power modules according to the load parameters;

[0064] Further, determining the target module to be switched from the standby power modules according to the load parameter includes:

[0065] Determining the capacity requirement of the target module according to the load parameters;

[0066] In a preset backup module database, a backup power module that meets the capacity requirement is screened to obtain a preliminary screening result;

[0067] Acquire the status parameters of each standby power module in the preliminary screening result from the standby module database; the status parameters include: cumulative operation time, historical switching success rate and number of temperature limit violations;

[0068] Based on the state parameters of the standby power modules, each standby power module in the preliminary screening result is comprehensively scored, and the standby power module with the highest comprehensive score is determined as the target module to be switched.

[0069] Specifically, the current load parameters, including the load power value and the load current value, are obtained, and then the required standby module capacity is calculated according to the load characteristics, or the required standby module capacity is determined according to 120% of the current load capacity.

[0070] A number of standby power modules that meet the required standby module capacity requirements are selected from the standby module database, and the comprehensive score of the standby power module is calculated based on the status parameters of these standby power modules: cumulative operating time, historical switching success rate, and number of temperature limit violations. Preferably, the comprehensive score of the standby power module is calculated according to the following formula:

[0071]

[0072] in, It is the comprehensive score of the standby power module; is the score of the accumulated operating time of the standby power module. In order to balance the use of new and old modules, its weight is preferably set to 0.3; is the score of the historical switching success rate of the standby power module. In order to ensure smooth switching, its weight is preferably set to 0.5; It is the score of the number of times the temperature of the standby power module exceeds the limit. In order to prevent overheating, its weight is preferably set to 0.2.

[0073] The comprehensive scores of these backup power modules are sorted in descending order, and a backup power module with the highest score is selected as the target module to be switched, so as to switch the faulty power module (i.e., the module to be switched) to the selected backup power module (i.e., the target module).

[0074] The embodiment of the present invention determines the capacity requirement of the target module according to the load parameters, and screens it in combination with the historical status parameters of the standby modules, and finally selects the best standby power module for switching. The comprehensive scoring mechanism takes into account the operating status of the standby modules, so that the selected target module has higher reliability, ensuring the efficient and stable operation of the system.

[0075] S4: determining control parameters of the target module based on a preset control parameter library, and pre-adjusting the target module according to the control parameters;

[0076] Further, the determining the control parameters of the target module based on a preset control parameter library includes:

[0077] Acquire dynamic response data of the target module; the dynamic response data includes voltage values ​​at a rising time point, a peak time point, and a stable time point; the dynamic response data is historical dynamic response data or predicted dynamic response data;

[0078] Based on a preset control parameter library, control parameter matching is performed according to the dynamic response data to obtain the control parameters of the target module; the control parameter library stores a mapping relationship between dynamic response data and control parameters; the control parameters include proportional coefficient, integral time and differential time.

[0079] Specifically, the expected dynamic response data of the target module is obtained from the database, including the voltage values ​​at the rising time point, the peak time point and the stable time point; wherein the expected dynamic response data of the target module can be obtained through the historical dynamic response data of the target module; it can also be obtained by prediction through a simulation model or historical data.

[0080] Further, the dynamic response data is normalized to obtain a sequence of characteristic values ​​in the range of 0 to 1; according to the sequence of characteristic values, matching control parameters are retrieved in a preset control parameter library, each group of parameters includes a proportional coefficient, an integral time, and a differential time, and preferably cubic spline interpolation is used to calculate the parameter values ​​to be selected, and the parameter group with the smallest interpolation error is selected as the candidate parameter group, and the control parameters of the candidate parameter group are read from the control parameter library, and the boundary restrictions are performed according to the range of proportional coefficient 0.1 to 10, integral time 0.01 to 1 second, and differential time 0 to 0.1 second to generate the control parameters of the target module. Exemplarily, the parameters of the 180kw working condition are obtained by interpolating the two parameter groups of 150kw and 200kw. The value range of the control parameter corresponds to the control characteristic requirements, the proportional coefficient 0.1 represents weak feedback, 10 represents strong feedback, the integral time 0.01 second corresponds to fast response, 1 second corresponds to slow adjustment, and the differential time does not exceed 0.1 second to avoid excessive overshoot.

[0081] Furthermore, the controller of the target module is pre-adjusted according to the generated control parameters of the target module, wherein the controller of the target module is a PID (Proportion Integration Differentiation) controller, and its control parameters are a proportional coefficient, an integral time, and a differential time.

[0082] The embodiment of the present invention automatically matches control parameters based on the dynamic response data of the target module in combination with a preset control parameter library, thereby achieving precise adjustment of the dynamic response of the target module during the switching process, and can improve the stability and response speed during module switching.

[0083] S5: Switch the module to be switched to an offline state, and switch the target module to a running state;

[0084] Further, the switching of the module to be switched to an offline state and the switching of the target module to a running state comprises:

[0085] Sending control instructions to the module to be switched and the target module at the same time;

[0086] According to the control instruction, starting the soft shutdown procedure of the module to be switched, so that the output voltage of the module to be switched decreases at a preset rate;

[0087] According to the control instruction, the target module is enabled and the output voltage of the target module is detected. When the output voltage of the target module is greater than a preset voltage threshold and the voltage change rate is less than a preset change rate threshold, a switching enable signal is generated to enable the target module to start running with load.

[0088] Specifically, a time division multiplexing communication protocol is adopted to send control instructions to the module to be switched and the target module at the same time, so that when the module to be switched enters the offline state, the target module enters the running state.

[0089] According to the control instruction, the soft shutdown program of the module to be switched is started, and the output voltage is reduced by 10V every 1ms. The voltage drop rate is limited to 10V / ms. At the same time, the output current value is monitored and controlled within twice the rated current. When the output voltage drops to 5% of the rated value, it is determined that the module to be switched is shut down. Among them, the shutdown program adopts a graded voltage reduction strategy. The 380 V voltage is reduced by 10 V every millisecond, and it takes 38 ms to complete the shutdown. The voltage drop rate is limited to 10V / ms to avoid the inductive back electromotive force. During the shutdown process, the output current is limited to twice the rated value. For example, the rated current of a 200 kw module is 500 A, and the current peak is limited to 1000 A. When the voltage drops to 19 V, the shutdown completion signal is triggered. At this time, the remaining voltage is only 5% of the rated value to ensure safe disconnection.

[0090] At the same time, the target module is enabled according to the control instruction, and the output voltage rising curve of the target module is monitored. When the voltage exceeds 90% of the rated value and the voltage change rate is less than 1V / ms, the switching enable signal is output to complete the load operation of the target module.

[0091] The embodiment of the present invention can realize the smooth switching of the power module by sending control instructions to the module to be switched and the target module at the same time, starting the soft shutdown and enabling program. Soft shutdown controls the voltage drop rate of the module to be switched to ensure its safe shutdown; and the startup monitoring of the target module can ensure that the load operation starts in time after the voltage stabilizes, avoiding unnecessary voltage fluctuations and transient interference in the system during the switching process, and improving the stability and reliability of the system switching.

[0092] S6: obtaining a second voltage currently output by the target module; performing transient response evaluation on the target module according to the second voltage to obtain an evaluation result, and modifying control parameters of the target module according to the evaluation result.

[0093] Further, the step of evaluating the transient response of the target module according to the second voltage to obtain an evaluation result, and modifying the control parameter of the target module according to the evaluation result includes:

[0094] According to the second voltage, obtaining the rise time, peak overshoot and oscillation frequency of the transient voltage;

[0095] Obtaining a transient response score according to a weighted sum of the rise time, the peak overshoot and the oscillation frequency;

[0096] If the transient response score is less than the preset score threshold, the control parameter of the target module is corrected by progressive fine-tuning until the transient response score corresponding to the corrected control parameter is not less than the preset score threshold, and the control parameter is determined.

[0097] Further, after modifying the control parameters of the target module according to the evaluation result, the method further includes:

[0098] The corrected control parameters are stored in the control parameter library to serve as reference parameters when the standby power module is started next time.

[0099] Specifically, after the target module is switched, the voltage data output by the target module is obtained, and the transient voltage characteristics of the voltage data are analyzed to obtain the rise time, peak overshoot and oscillation frequency. The rise time is measured in milliseconds, the overshoot is measured in percentage, and the oscillation frequency is measured in Hertz. A transient response score of 0 to 100 is generated, and the parameters are updated when the score is lower than 60. Among them, the rise time is the time required for the voltage to rise from 10% to 90%, and its normal value is 5 ms. If it exceeds 10 ms, the score will be reduced; the peak overshoot is the difference between the maximum voltage and the steady-state value, and its normal value is 10%. If it exceeds 20%, the score will be significantly reduced; the oscillation frequency represents the oscillation period, and its normal value is less than 100 Hz. If it exceeds 200 Hz, it means that the damping is insufficient and the score is reduced. Then, according to the weighted addition of the scores of the rise time, peak overshoot and oscillation frequency, the total score, i.e., the transient response score, is calculated.

[0100] Further, when the transient response score is lower than the preset score threshold, the transient response is optimized by adjusting the control parameters according to the transient response evaluation result. The rise time and stability are improved by adjusting the proportional coefficient. If the proportional coefficient is too large, it will cause overshoot and oscillation, and if it is too small, the response will be too slow. The steady-state error of the system is improved by adjusting the integral time to avoid voltage drift. The oscillation frequency and overshoot are reduced by adjusting the differential time to improve the stability of the system. Specifically, the control parameters are optimized by progressive fine-tuning. For example, for the proportional coefficient, adjust 0.5 each time. If the proportional coefficient value is too high and causes overshoot, reduce the proportional coefficient, otherwise increase it; for the integral time, adjust 0.1ms each time, and adjust the integral time in a fine-tuning manner to eliminate the steady-state error; for the differential time, adjust 0.1 ms each time, and adjust the differential time to control the oscillation frequency.

[0101] The embodiment of the present invention evaluates the transient response of the target module and generates a transient response score, so as to monitor the performance of the target module in real time after startup and fine-tune the control parameters according to the score results; by progressively fine-tuning the control parameters, the stable operation of the module after load switching is ensured, thereby optimizing the dynamic response performance of the module, reducing unnecessary transient fluctuations, and improving the response speed and accuracy of the power module.

[0102] Furthermore, the embodiment of the present invention also analyzes the voltage data through short-time Fourier transform (STFT) to obtain the spectrum distribution and determine whether the waveform has too many harmonic components or high-frequency noise; by analyzing the energy ratio of the fundamental wave, harmonics and high-frequency components, it is determined whether the voltage fluctuation of the system is stable. If there is a large oscillation (too high harmonic or high-frequency component energy ratio), the control parameters are corrected.

[0103] Furthermore, after each modification, online verification is performed to check whether the adjusted control parameters are effective by collecting data (e.g., 100 milliseconds). By continuously adjusting the proportional coefficient, integral time, and differential time of the PID controller of the target module and optimizing the transient response until the score reaches the expected stability and responsiveness standards, the dynamic response and stability of the system can be optimized more finely.

[0104] The embodiment of the present invention stores the corrected control parameters in the control parameter library, so that the corrected parameters can be directly referenced when the standby module is started next time, further reducing the uncertainty in the startup process and improving the startup and switching efficiency of the standby module. At the same time, the accumulation and correction of historical control parameters can gradually optimize the control strategy and improve the long-term operation stability and performance of the entire system.

[0105] Correspondingly, the present invention also provides a control system for seamless switching of power modules, which can implement all processes of the control method for seamless switching of power modules in the above-mentioned embodiment.

[0106] See also Figure 2 , Figure 2 1 is a schematic diagram of a control system for seamless switching of a power module provided by an embodiment of the present invention. The control system for seamless switching of a power module comprises:

[0107] The module voltage acquisition module 201 is used to acquire the first voltage currently output by the power module in the low-voltage distribution network;

[0108] A voltage distortion monitoring module 202 is used to monitor the voltage distortion of the power module according to the first voltage; if the power module has voltage distortion and the distortion degree exceeds a preset threshold, the power module is determined to be a module to be switched;

[0109] The target module determination module 203 is used to obtain the current load parameters and determine the target module to be switched from the standby power modules according to the load parameters;

[0110] A parameter pre-adjustment module 204 is used to determine the control parameters of the target module based on a preset control parameter library, and pre-adjust the target module according to the control parameters;

[0111] The power module switching module 205 is used to switch the module to be switched to an offline state and switch the target module to a running state;

[0112] The control parameter correction module 206 is used to obtain the second voltage currently output by the target module; perform transient response evaluation on the target module according to the second voltage to obtain an evaluation result, and correct the control parameters of the target module according to the evaluation result.

[0113] Preferably, the voltage distortion monitoring module 202 is specifically used for:

[0114] Calculating a root mean square deviation value between the first voltage and a rated voltage of the power module;

[0115] If the RMS deviation value is greater than a preset first distortion threshold, it is determined that voltage distortion occurs in the power module;

[0116] If the duration of voltage distortion in the power module is greater than a preset duration, or the root mean square deviation value is greater than a preset second distortion threshold, the power module is determined as a module to be switched; the second distortion threshold is greater than the first distortion threshold.

[0117] Preferably, the target module determination module 203 is specifically used for:

[0118] Determining the capacity requirement of the target module according to the load parameters;

[0119] In a preset backup module database, a backup power module that meets the capacity requirement is screened to obtain a preliminary screening result;

[0120] Acquire the status parameters of each standby power module in the preliminary screening result from the standby module database; the status parameters include: cumulative operation time, historical switching success rate and number of temperature limit violations;

[0121] Based on the state parameters of the standby power modules, each standby power module in the preliminary screening result is comprehensively scored, and the standby power module with the highest comprehensive score is determined as the target module to be switched.

[0122] Preferably, the parameter pre-adjustment module 204 is specifically used for:

[0123] Acquire dynamic response data of the target module; the dynamic response data includes voltage values ​​at a rising time point, a peak time point, and a stable time point; the dynamic response data is historical dynamic response data or predicted dynamic response data;

[0124] Based on a preset control parameter library, control parameter matching is performed according to the dynamic response data to obtain the control parameters of the target module; the control parameter library stores a mapping relationship between dynamic response data and control parameters; the control parameters include proportional coefficient, integral time and differential time.

[0125] Preferably, the power module switching module 205 is specifically used for:

[0126] Sending control instructions to the module to be switched and the target module at the same time;

[0127] According to the control instruction, starting the soft shutdown procedure of the module to be switched, so that the output voltage of the module to be switched decreases at a preset rate;

[0128] According to the control instruction, the target module is enabled and the output voltage of the target module is detected. When the output voltage of the target module is greater than a preset voltage threshold and the voltage change rate is less than a preset change rate threshold, a switching enable signal is generated to enable the target module to start running with load.

[0129] Preferably, the control parameter correction module 206 is specifically used for:

[0130] According to the second voltage, obtaining the rise time, peak overshoot and oscillation frequency of the transient voltage;

[0131] Obtaining a transient response score according to a weighted sum of the rise time, the peak overshoot and the oscillation frequency;

[0132] If the transient response score is less than the preset score threshold, the control parameter of the target module is corrected by progressive fine-tuning until the transient response score corresponding to the corrected control parameter is not less than the preset score threshold, and the control parameter is determined.

[0133] Preferably, the control system for seamless switching of the power module is also used for:

[0134] The corrected control parameters are stored in the control parameter library to serve as reference parameters when the standby power module is started next time.

[0135] In the specific implementation, the working principle, control process and technical effect achieved by the control system for seamless switching of power modules provided in the embodiment of the present invention are the same as those of the control method for seamless switching of power modules in the above embodiment, and will not be repeated here.

[0136] The embodiment of the present invention provides a control method and system for seamless switching of power modules, which has the following beneficial effects: by detecting the voltage distortion of the power module and triggering switching when the voltage distortion exceeds a threshold, the faulty or abnormally operating power module can be identified in time to ensure the stability of the system. At the same time, a spare module is selected and its control parameters are pre-adjusted, which reduces the transient response of the power module during the switching process, realizes seamless switching of the power module, and improves the switching efficiency and stability; by combining the capacity requirement and historical state parameters of the module to select the target module for switching, the reliability of the selected target module is guaranteed; by automatically matching the control parameters in the control parameter library based on the dynamic response data of the target module, the control parameters of the target module are pre-adjusted, and the stability and response speed of the module during switching are improved; by evaluating the transient response of the target module and then fine-tuning the control parameters, the stable operation of the module after the module switching can be ensured, thereby optimizing the dynamic response performance of the module, reducing unnecessary transient fluctuations, and improving the response speed and accuracy of the power module. The embodiments of the present invention can improve the stability, reliability and efficiency of the power module switching process, realize seamless switching, effectively reduce transient impacts, and improve system performance and fault recovery capabilities.

[0137] The above is a preferred embodiment of the present invention. It should be pointed out that a person skilled in the art can make several improvements and modifications without departing from the principle of the present invention. These improvements and modifications are also considered to be within the scope of protection of the present invention.

Claims

1. A control method for seamless switching of a power module, characterized in that: include: Obtaining a first voltage currently output by a power module in a low-voltage distribution network; Performing voltage distortion monitoring on the power module according to the first voltage; If voltage distortion occurs in the power module and the degree of distortion exceeds a preset threshold, determining that the power module is a module to be switched; Acquire current load parameters, and determine a target module to be switched from the standby power modules according to the load parameters; Determining control parameters of the target module based on a preset control parameter library, and pre-adjusting the target module according to the control parameters; Switch the module to be switched to an offline state, and switch the target module to a running state; Acquire a second voltage currently output by the target module; A transient response evaluation is performed on the target module according to the second voltage to obtain an evaluation result, and a control parameter of the target module is modified according to the evaluation result.

2. The control method for seamless switching of power modules according to claim 1, characterized in that: performing voltage distortion monitoring on the power module according to the first voltage; If the power module has voltage distortion and the distortion degree exceeds a preset threshold, determining that the power module is a module to be switched includes: Calculating a root mean square deviation value between the first voltage and a rated voltage of the power module; If the RMS deviation value is greater than a preset first distortion threshold, it is determined that voltage distortion occurs in the power module; If the duration of voltage distortion in the power module is greater than a preset duration, or the root mean square deviation value is greater than a preset second distortion threshold, the power module is determined as a module to be switched; the second distortion threshold is greater than the first distortion threshold.

3. The control method for seamless switching of power modules according to claim 1, characterized in that: The step of determining a target module to be switched from the standby power modules according to the load parameters includes: Determining the capacity requirement of the target module according to the load parameters; In a preset backup module database, a backup power module that meets the capacity requirement is screened to obtain a preliminary screening result; Acquire the status parameters of each standby power module in the preliminary screening result from the standby module database; the status parameters include: cumulative operation time, historical switching success rate and number of temperature limit violations; Based on the state parameters of the standby power modules, each standby power module in the preliminary screening result is comprehensively scored, and the standby power module with the highest comprehensive score is determined as the target module to be switched.

4. The control method for seamless switching of power modules according to claim 1, characterized in that: The determining the control parameters of the target module based on a preset control parameter library includes: Acquire dynamic response data of the target module; the dynamic response data includes voltage values ​​at a rising time point, a peak time point, and a stable time point; the dynamic response data is historical dynamic response data or predicted dynamic response data; Based on a preset control parameter library, control parameter matching is performed according to the dynamic response data to obtain the control parameters of the target module; the control parameter library stores a mapping relationship between dynamic response data and control parameters; the control parameters include proportional coefficient, integral time and differential time.

5. The control method for seamless switching of power modules according to claim 1, characterized in that: The step of switching the module to be switched to an offline state and simultaneously switching the target module to a running state includes: Sending control instructions to the module to be switched and the target module at the same time; According to the control instruction, a soft shutdown procedure of the module to be switched is started, so that the output voltage of the module to be switched decreases at a preset rate; According to the control instruction, the target module is enabled and the output voltage of the target module is detected. When the output voltage of the target module is greater than a preset voltage threshold and the voltage change rate is less than a preset change rate threshold, a switching enable signal is generated to enable the target module to start running with load.

6. The control method for seamless switching of power modules according to claim 1, characterized in that: The step of performing transient response evaluation on the target module according to the second voltage to obtain an evaluation result, and modifying a control parameter of the target module according to the evaluation result includes: According to the second voltage, obtaining the rise time, peak overshoot and oscillation frequency of the transient voltage; Obtaining a transient response score according to a weighted sum of the rise time, the peak overshoot and the oscillation frequency; If the transient response score is less than the preset score threshold, the control parameter of the target module is corrected by progressive fine-tuning until the transient response score corresponding to the corrected control parameter is not less than the preset score threshold, and the control parameter is determined.

7. The control method for seamless switching of power modules according to claim 1, characterized in that: After modifying the control parameters of the target module according to the evaluation result, the method further includes: The corrected control parameters are stored in the control parameter library to serve as reference parameters when the standby power module is started next time.

8. A control system for seamless switching of power modules, characterized in that: include: A module voltage acquisition module, used to obtain a first voltage currently output by a power module in a low-voltage distribution network; A voltage distortion monitoring module, used for monitoring voltage distortion of the power module according to the first voltage; If voltage distortion occurs in the power module and the degree of distortion exceeds a preset threshold, determining that the power module is a module to be switched; A target module determination module, used to obtain current load parameters and determine a target module to be switched from the standby power modules according to the load parameters; A parameter pre-adjustment module, used to determine the control parameters of the target module based on a preset control parameter library, and pre-adjust the target module according to the control parameters; A power module switching module, used to switch the module to be switched to an offline state and simultaneously switch the target module to a running state; A control parameter correction module, used for obtaining a second voltage currently output by the target module; A transient response evaluation is performed on the target module according to the second voltage to obtain an evaluation result, and a control parameter of the target module is modified according to the evaluation result.

9. The control system for seamless switching of power modules as claimed in claim 8, characterized in that: The voltage distortion monitoring module is specifically used for: Calculating a root mean square deviation value between the first voltage and a rated voltage of the power module; If the RMS deviation value is greater than a preset first distortion threshold, it is determined that voltage distortion occurs in the power module; If the duration of voltage distortion in the power module is greater than a preset duration, or the root mean square deviation value is greater than a preset second distortion threshold, the power module is determined as a module to be switched; the second distortion threshold is greater than the first distortion threshold.

10. The control system for seamless switching of power modules according to claim 8, characterized in that: The target module determination module is specifically used for: Determining the capacity requirement of the target module according to the load parameters; In a preset backup module database, a backup power module that meets the capacity requirement is screened to obtain a preliminary screening result; Acquire the state parameter of each standby power module in the preliminary screening result from the standby module database; The state parameters include: cumulative running time, historical switching success rate and number of temperature limit violations; Based on the state parameters of the standby power modules, each standby power module in the preliminary screening result is comprehensively scored, and the standby power module with the highest comprehensive score is determined as the target module to be switched.

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