Inverter power supply flexible control method and device and computer program product

Abstract

The invention discloses an inverter power supply flexible control method and device and a computer program product, and the method comprises the steps: S1, obtaining and processing the operation parameters of an inverter power supply module in real time, and obtaining the working state data of the inverter power supply module; s2, according to the working state data of the inverter power supply module, performing synchronous tracking on bus voltage and voltage to be merged by adopting a digital phase locked loop technology and combining a synchronous control strategy; s3, calculating and distributing the output current of each inverter power supply module according to the working state data of the inverter power supply module; and S4, monitoring the operation parameters of the inverter power supply module in real time, and determining whether to isolate and exit the fault module according to the fault type and severity when an abnormity or a fault is detected. The problems of the inverter power supply module in the aspects of synchronous tracking, parallel current sharing and fault processing are effectively solved, online flexible merging and exiting of the module are realized, and the reliability and the electric energy quality of a power system are directly improved.

Description

Technical Field

[0001] The present invention relates to the field of power electronics technology, and in particular to a method and device for flexible control of an inverter power supply and a computer program product. Background Art

[0002] With the continuous evolution and upgrading of the power system equipment structure, the power system is facing new challenges from the access of a large number of intelligent and digital devices, which have put forward more stringent requirements on the stability and power quality of the system. In this context, the efficiency and reliability of the inverter control technology, as the core power supply component of the power system, have become the focus of power electronics research.

[0003] In modern power grids, power inverter modules are usually operated in clusters in parallel. This configuration not only significantly improves the overall reliability and operational flexibility of the system, but is also widely used in uninterruptible power supply (UPS) systems in substations. However, the internal parameter differences, inconsistent response times, and changes in external environmental factors between parallel-operating inverter modules often lead to uneven current diversion and synchronization tracking problems, which in turn pose a threat to the stable operation of the system and the quality of power output.

[0004] More importantly, if a module fails during the operation of the inverter power parallel system, it must be quickly and accurately isolated and exited from the system to prevent the fault from spreading and causing the collapse of the entire parallel system. Traditional fault handling solutions often find it difficult to achieve an ideal balance between response speed and accuracy, and the complexity of fault handling has also become a major problem in system design. Summary of the invention

[0005] The technical problem to be solved by the present invention is to provide a flexible control method, device and computer program product for an inverter power supply to improve the overall performance of an inverter power supply parallel system, improve the power quality and ensure the stable operation of the system.

[0006] In order to solve the above technical problems, the present invention provides a flexible control method for an inverter power supply, comprising:

[0007] Step S1, acquiring and processing the operating parameters of the inverter power module in real time to obtain the working status data of the inverter power module;

[0008] Step S2, according to the working state data of the inverter power module, using the digital phase-locked loop technology and combining with the synchronous control strategy, synchronously tracking the bus voltage and the voltage to be incorporated;

[0009] Step S3, calculating and distributing the output current of each inverter power module according to the working status data of the inverter power module;

[0010] Step S4, real-time monitoring of the operating parameters of the inverter power module, when an abnormality or fault is detected, determining whether to isolate and exit the faulty module according to the type and severity of the fault.

[0011] Preferably, the step S1 specifically includes:

[0012] Using high-precision sensors, the voltage, current, frequency and temperature of the inverter power module are measured and captured in real time according to certain sampling frequency and accuracy requirements;

[0013] Perform mathematical calculations on the collected raw data to obtain the frequency, amplitude and phase of parameters such as voltage and current;

[0014] Use the preset filtering algorithm to digitally filter the collected data to remove interfering noise data;

[0015] In the framework of the adaptive algorithm, the processed working status data is compared with the preset system performance requirements or standard values ​​to obtain the difference;

[0016] According to the difference, a corresponding dynamic adjustment output control command is generated to adjust the output of the inverter power module in real time.

[0017] Preferably, the step S2 specifically includes:

[0018] Through the detection circuit or algorithm, the phase difference between the output voltage of the inverter power module to be paralleled and the voltage of the operating bus is monitored and compared in real time;

[0019] When the phase difference is within the preset allowable range, the phase locking mechanism is started, and the output phase of the inverter power module to be paralleled is adjusted using the digital phase locking loop technology to synchronize it with the bus voltage phase;

[0020] After the phase is locked, a synchronization instruction is output, and according to the synchronization instruction, the output drive unit is controlled to put the inverter power supply module to be paralleled into the bus system.

[0021] Preferably, the step S3 specifically includes:

[0022] Obtain the number of inverter power modules currently in parallel operation and the total current input parameter of the entire parallel system;

[0023] According to the number of modules and the total current input parameter, a current sharing algorithm is used to calculate the theoretical current value that should be allocated to each inverter power module;

[0024] Receiving the current value to be distributed to each inverter power module as a control target, and controlling the output current of the inverter power module to be close to or equal to the theoretically calculated distribution current value by controlling the power conversion circuit inside the inverter power module;

[0025] The load current actually output by the inverter power module is detected in real time, and the inverter power module is adjusted in real time according to the deviation between the feedback current and the theoretical distribution current.

[0026] Preferably, the step S4 specifically includes:

[0027] Use high-precision sensors to continuously collect various operating parameters of the inverter power module;

[0028] When a module that may have a fault is identified, determine whether the faulty module needs to exit the system based on the severity of the fault, the fault type, the current operating load of the system, and the spare capacity of other modules;

[0029] When it is determined that a module needs to exit the system, the preset fault response procedure is executed and the output relay is controlled to remove the faulty module from the system.

[0030] The present invention also provides an inverter power supply flexible control device, comprising:

[0031] The parameter acquisition and processing module is used to acquire the operating parameters of the inverter power module in real time and process the operating status data of the inverter power module;

[0032] The synchronous tracking module adopts the digital phase-locked loop technology and combines the synchronous control strategy to synchronously track the bus voltage and the voltage to be incorporated according to the working status data;

[0033] A current distribution module, which calculates and distributes the output current of each inverter power supply module according to the working status data to achieve coordinated operation among the modules;

[0034] The fault monitoring and processing module monitors the operating parameters of the inverter power module in real time. When an abnormality or fault is detected, it decides whether to isolate and exit the faulty module based on the fault type and severity.

[0035] Preferably, the synchronization tracking module is specifically used for:

[0036] Through the detection circuit or algorithm, the phase difference between the output voltage of the inverter power module to be paralleled and the voltage of the operating bus is monitored and compared in real time;

[0037] When the phase difference is within the preset allowable range, the phase locking mechanism is started, and the output phase of the inverter power module to be paralleled is adjusted using the digital phase locking loop technology to synchronize it with the bus voltage phase;

[0038] After the phase is locked, a synchronization instruction is output, and according to the synchronization instruction, the output drive unit is controlled to put the inverter power supply module to be paralleled into the bus system.

[0039] Preferably, the current distribution module is specifically used for:

[0040] According to the number of modules and the total current input parameter, a current sharing algorithm is used to calculate the theoretical current value that should be allocated to each inverter power module;

[0041] Receiving the current value to be distributed to each inverter power module as a control target, and controlling the output current of the inverter power module to be close to or equal to the theoretically calculated distribution current value by controlling the power conversion circuit inside the inverter power module;

[0042] The load current actually output by the inverter power module is detected in real time, and the inverter power module is adjusted in real time according to the deviation between the feedback current and the theoretical distribution current.

[0043] The present invention also provides an inverter power supply flexible control device, comprising:

[0044] one or more processors;

[0045] Memory;

[0046] One or more applications, wherein the one or more applications are stored in the memory and are configured to be executed by the one or more processors, and the one or more applications are configured to execute the inverter power supply flexible control method.

[0047] The present invention also provides a computer program product, comprising computer instructions, wherein the computer instructions instruct a computer device to execute operations corresponding to the method.

[0048] The implementation of the present invention has the following beneficial effects: the present invention effectively solves the difficult problems of the inverter power supply module in synchronous tracking, parallel current sharing and fault handling, and realizes the flexible online incorporation and exit of the module. The present invention significantly improves the operation and maintenance efficiency, reduces the power outage time caused by online faults, and directly improves the reliability and power quality of the power system. Compared with the prior art, the control method of the present invention is more adaptable, can flexibly respond to changing working environments and emergency dispatch requirements, and significantly enhances the current sharing ability and synchronous tracking accuracy of the mobile inverter power supply when operating in parallel. At the same time, it can quickly and accurately identify and isolate the faulty module, greatly reducing the downtime and maintenance cost of the system. The application of the present invention can not only improve the stability and safety of the power system, but also bring significant economic and social benefits, provide strong support for the intelligent and efficient development of the power industry, and has important promotion and application value. BRIEF DESCRIPTION OF THE DRAWINGS

[0049] 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 will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0050] Figure 1 The present invention is a flowchart of a flexible control method for an inverter power supply according to an embodiment of the present invention.

[0051] Figure 2 It is a specific flow chart of a method for flexible control of an inverter power supply according to an embodiment of the present invention. DETAILED DESCRIPTION

[0052] The following descriptions of the embodiments refer to the accompanying drawings to illustrate specific embodiments in which the present invention may be implemented.

[0053] Please refer to Figure 1 As shown, an embodiment of the present invention provides a flexible control method for an inverter power supply, comprising:

[0054] Step S1, acquiring and processing the operating parameters of the inverter power module in real time to obtain the working status data of the inverter power module;

[0055] Step S2, according to the working state data of the inverter power module, using the digital phase-locked loop technology and combining with the synchronous control strategy, synchronously tracking the bus voltage and the voltage to be incorporated;

[0056] Step S3, calculating and distributing the output current of each inverter power module according to the working status data of the inverter power module;

[0057] Step S4, real-time monitoring of the operating parameters of the inverter power module, when an abnormality or fault is detected, determining whether to isolate and exit the faulty module according to the type and severity of the fault.

[0058] It can be seen from the above steps that the embodiment of the present invention is based on digital control, and achieves accurate parallel current sharing of the inverter power modules by accurately detecting the status of the inverter power modules and synchronous tracking, while ensuring that the modules can be actively exited quickly and smoothly when a fault occurs, thereby ensuring the stability and quality of the power output.

[0059] Specifically, please combine Figure 2As shown, in the embodiment of the present invention, the purpose of step S1 is to provide an accurate, reliable and real-time updated inverter power module operation data basis for subsequent synchronous tracking, intelligent current sharing control, and fault detection and processing steps. Through the collaborative work of high-precision sensors and data processing units, the key operating parameters of the inverter power module are comprehensively and meticulously acquired and preprocessed to ensure that the system can make reasonable control decisions based on accurate data, thereby adapting to the operating requirements under different working conditions and ensuring the efficient and stable operation of the entire inverter power system. It specifically includes the following processes:

[0060] (1) Data Collection

[0061] Using high-precision sensors, the voltage, current, frequency, temperature and other parameters of the inverter power module are measured and captured in real time according to certain sampling frequency and accuracy requirements. These parameters directly reflect the current working status of the module and are the original data source for all subsequent data processing and control decisions. For example, for an inverter power module that is supplying power to a specific load, data acquisition can accurately know the actual value of its output voltage, the size of the output current, the operating frequency and the temperature of the module itself. This information is crucial to determine whether the module is working properly and whether the performance meets the requirements.

[0062] (2) Data Operation

[0063] The collected raw data is processed quickly and with complex mathematical calculations. First, the collected analog signals are converted into digital signals, and then the frequency, amplitude, phase and other key characteristic quantities of voltage, current and other parameters are calculated at each collection point through a specific algorithm. For example, for voltage signals, the fundamental frequency and the amplitude and phase of each harmonic are calculated through algorithms such as discrete Fourier transform (DFT). These calculation results can reveal the intrinsic characteristics of electrical signals in more depth and provide more valuable information for subsequent control and analysis.

[0064] (3) Digital filtering

[0065] Since the inverter power system is affected by various electromagnetic interference factors during actual operation, the collected data may contain some transient interference noise data. The digital filtering process is to use preset filtering algorithms, such as Butterworth filter, Kalman filter, etc., to screen and filter the collected transient data. For example, when the system is affected by electromagnetic interference from other nearby electrical equipment, causing instantaneous spikes or fluctuations in the collected current data, digital filtering can remove these abnormal interference data and retain valid data that truly reflects the operating status of the module, thereby improving the accuracy and reliability of the data.

[0066] (4) Status comparison

[0067] In the framework of the adaptive algorithm, the processed working status data feedback is compared with the pre-set system performance requirements or standard values. For example, the output voltage amplitude of the inverter power module is set to be stable within a specific range. If the voltage amplitude actually collected and calculated deviates from this range, the difference between the two will be calculated. This difference reflects the degree of deviation between the current module operating state and the ideal state, providing a quantitative basis for subsequent dynamic adjustments.

[0068] (5) Dynamic Adjustment

[0069] According to the difference obtained by the state comparison, especially the positive deviation (that is, the actual value is greater than the ideal value), the system will generate the corresponding dynamic adjustment output control command. These commands can act on the internal control circuit of the inverter power module, such as adjusting the conduction time of the power switch tube, changing the modulation ratio, etc., so as to adjust the output of the module in real time. Through this dynamic adjustment mechanism, no matter what complex environmental conditions the inverter power system is in, such as sudden load changes, temperature changes, etc., the operating parameters of the module can be kept in the optimal state as much as possible, and possible performance deviations can be corrected in time, effectively reducing the system downtime caused by faults or poor performance. At the same time, it is also convenient for maintenance personnel to analyze these adjustment data and processes to more efficiently locate potential system problems and carry out targeted processing.

[0070] Step S2 is to achieve accurate synchronization tracking between the module to be connected and the online bus, which is a key link to ensure that the inverter power supply system can stably and efficiently operate multiple modules in parallel. Through a series of precise control processes, it is ensured that when the module to be connected is connected to the bus, its voltage phase, frequency and other key parameters are highly consistent with the bus voltage, thereby avoiding problems such as circulating current and power oscillation caused by poor synchronization, ensuring the power quality and reliability of the entire parallel system, and improving the overall performance and stability of the system. It specifically includes the following processes:

[0071] (1) Phase difference comparison

[0072] This process is the starting step of synchronization tracking. Through a special detection circuit or algorithm, the key difference value of the output voltage of the module to be connected and the voltage of the operating bus in terms of synchronization is monitored and compared in real time. Determine whether the voltage phase of the module to be connected is ahead of the bus voltage or lags behind the bus voltage, as well as the specific degree of leading or lagging (measured in angles or time, etc.). For example, in a distributed power generation system composed of multiple inverter power modules, when a new inverter power module is ready to be connected to the bus, the phase difference between the two must be accurately measured first. This precise phase difference comparison provides a key decision-making basis for subsequent phase locking operations. Only by accurately knowing the phase difference can targeted measures be taken to adjust the phase of the module to be connected to synchronize it with the bus voltage.

[0073] (2) Phase Lock

[0074] Once the phase difference comparison shows that the phase of the module to be connected is close to the condition for being connected to the bus (usually the phase difference is within a preset allowable range), the phase locking mechanism is started. Using the efficient digital phase locked loop (DPLL) technology, which is similar to an intelligent control system that can automatically track the phase of the target signal, it can dynamically adjust the output phase of the module to be connected based on the input reference signal (i.e., bus voltage signal) and the voltage signal of the module to be connected, through internal phase detectors, loop filters, voltage-controlled oscillators and other components, so that it closely follows the phase change of the bus voltage, and finally accurately locks the phase of the module to be connected in a state synchronized with the bus voltage. When the phase locking is completed, the system will output a synchronization instruction for the bus voltage and the voltage of the module to be connected, which indicates that the module to be connected is ready to be connected to the bus in a synchronized state.

[0075] (3) Synchronous control command

[0076] After receiving the synchronization instruction after phase locking, the synchronous control command link immediately takes effect. According to this instruction, it controls the output drive unit to quickly and accurately put the module to be paralleled into the bus system. The output drive unit can include hardware components such as power switching devices and drive circuits. By accurately controlling the switching actions of these components, the module to be paralleled is connected to the bus at the right time, so that the module to be paralleled can be smoothly merged into the bus operation, realizing seamless switching from independent operation to parallel operation. The whole process needs to be completed in a very short time, and it is necessary to ensure that the bus voltage and other modules running online will not be impacted or interfered during the merging process, so as to ensure the consistency of the coordinated operation of multiple modules, improve the synchronization accuracy and stability of the entire system, and realize efficient and reliable operation of parallel operation.

[0077] The main purpose of step S3 is to realize the automatic balanced distribution of load current when the inverter power modules are running in parallel. In a system composed of multiple inverter power modules running in parallel, if the load current distribution between the modules is uneven, some modules may be overloaded, and the overloaded modules will be heated up due to long-term excessive current stress, accelerated component aging, and even damaged, thereby affecting the normal operation of the entire system. Through the intelligent current sharing control strategy of this step, it can be ensured that each module bears a reasonable load current, so that the system can operate stably and efficiently under different load conditions, give full play to the advantages of the parallel system, and improve the overall performance and reliability of the system.

[0078] The system first obtains the number of inverter power modules currently in parallel operation, that is, the number of operating modules parameter, and the total current input parameter of the entire parallel system. For example, in a power supply system consisting of 5 inverter power modules in parallel, if the total input current is 100A detected by the current sensor, the number of operating modules parameter is 5 and the total current input parameter is 100A. These parameters provide basic data for subsequent load current distribution calculations. Based on these data, the system can use specific current sharing algorithms, such as the average current method, the maximum current automatic current sharing method, etc., to calculate the theoretical current value that should be allocated to each module. Taking the average current method as an example, in the above system, the current value that should be allocated to each module in theory is 100A / 5=20A. This calculation method based on the number of operating modules and the total input current can ensure that when the system load changes, the load current is reasonably distributed according to the current actual situation, so that the current shared by each module is relatively balanced, and avoid the situation where some modules bear too much current while other modules are idle.

[0079] The load current control specifically receives the current value that each module should allocate from the above calculation process and uses it as the control target. By controlling the power conversion circuit inside the inverter power supply module, such as adjusting the conduction time of the power switch tube, the duty cycle of the drive signal, etc., the output current of the module load output is accurately controlled to be close to or equal to the theoretically calculated distribution current value. For example, if a module should output 18A of current according to calculation, but its actual output current is detected to be 16A, the load current control unit will increase the conduction time of the power switch tube by adjusting its internal control signal, so that the output current gradually rises to a target value close to 18A. This process requires fast response capability and high-precision control performance to cope with dynamic changes in the load and various interference factors in the system, to ensure that the output current of each module can accurately track the distribution current value, and to achieve accurate control and balanced distribution of the load current.

[0080] The module load current feedback parameter is an important basis for realizing intelligent regulation. During the operation of the module, the actual output load current of the module is detected in real time and fed back to the control system as a feedback signal. According to the deviation between this feedback current and the theoretical distribution current, the control system uses the intelligent regulation algorithm to adjust the module in real time. For example, if the actual output current of a module rises to 22A due to a sudden change in load, exceeding the theoretical distribution of 20A, the control system will adjust the control parameters of the load current control unit according to this feedback information, such as appropriately reducing the conduction time of the power switch tube, so that the output current gradually drops back to a reasonable range close to 20A. This feedback-based intelligent regulation mechanism enables the system to automatically adapt to the dynamic changes of the load, continuously fine-tune the output current of each module, and ensure that under various complex operating conditions, the load current of each module is always balanced, thereby realizing the automatic balanced distribution of load current when the inverter power supply module is running in parallel, effectively avoiding damage to individual modules due to overload, and ensuring the stable and reliable operation of the entire parallel system.

[0081] Step S4 is used to promptly discover and properly handle possible faulty modules in the system, ensuring that when some modules fail, the entire system can still maintain stable operation, and will not cause system shutdown or serious performance degradation due to fault propagation or unreasonable handling methods. This is especially important for some application scenarios that require high power supply continuity, such as industrial production, medical equipment power supply, data centers, etc., which can effectively reduce economic losses and potential risks caused by failures and ensure the normal operation of key equipment and systems. It specifically includes the following processes:

[0082] (1) Fault diagnosis

[0083] The fault diagnosis mechanism uses a variety of methods to monitor and analyze the operating status of the inverter power module in a comprehensive and real-time manner to quickly identify the faulty module. First, high-precision sensors are used to continuously collect various operating parameters of the module, including voltage, current, temperature, frequency, etc. These parameters are key indicators for determining whether the module is operating normally. For example, if a normally operating inverter power module has an output voltage that is stable within a certain range near the rated value, the current should also match the load demand, and the temperature should remain relatively stable under reasonable heat dissipation conditions. When these parameters change abnormally, such as voltage sag, current overload, and temperature rise sharply, the fault diagnosis mechanism will preliminarily determine that the module may have a fault based on the preset fault threshold and judgment logic. At the same time, the accuracy and reliability of fault diagnosis can be further improved by combining the monitoring of the internal circuit status of the module, such as the working status of the power switch tube and the integrity of the control signal. Through this multi-dimensional, real-time monitoring and analysis, the fault diagnosis mechanism can quickly detect abnormal conditions in the early stages of a fault, buy valuable time for subsequent fault handling, and avoid further deterioration of the fault.

[0084] (2) Exit strategy analysis

[0085] Once the fault diagnosis mechanism identifies a module that may have a fault, the exit strategy analysis mechanism will comprehensively consider multiple factors to screen and decide whether the faulty module needs to exit the system. These factors include the severity of the fault, the type of fault, the current operating load of the system, and the spare capacity of other modules. For example, if it is a minor fault, such as a short-term abnormal reading of a sensor, but the main function of the module can still operate normally, and the system load is light, and other modules have sufficient spare capacity to temporarily share the load of the module, then the exit strategy analysis mechanism will decide not to temporarily exit the module from the system, but take some online repair or monitoring measures, such as trying to restart the relevant subsystems of the faulty module, further verifying and diagnosing the fault parameters, etc. However, if it is a serious fault, such as a power switch tube breakdown causing a short circuit, this fault may affect the safe operation of the entire system. At this time, the exit strategy analysis mechanism will decisively decide to exit the faulty module from the system to prevent the fault from causing damage to other modules. Through this comprehensive analysis and decision-making process, the exit strategy analysis mechanism can flexibly formulate the most suitable fault handling strategy according to the specific situation, and minimize unnecessary module exits while ensuring the safe and stable operation of the system, thereby improving the overall availability of the system.

[0086] (3) Export Control

[0087] When the exit strategy analysis mechanism determines that a module needs to exit the system, the exit control link immediately executes the preset fault response procedure. Specifically, it will quickly output commands to control the output relay to remove the faulty module from the system. This process requires precise control and fast response to ensure that the faulty module can be quickly and safely disconnected from the system without interfering with the work of other normal modules. As an actuator, the output relay has the characteristics of high reliability and fast action. It can complete the switching action in a very short time after receiving the control command and isolate the faulty module from the circuit. For example, in a power supply system composed of multiple inverter power modules in parallel, if a module is determined to need to exit, the exit control unit will send a trigger signal to the output relay connected to the module, so that the contacts of the relay are quickly disconnected, thereby cutting off the electrical connection between the faulty module and the busbar, and realizing the isolation of the faulty module. Throughout the process, the system will use various means, such as optimizing the transmission path of the control signal and adopting a high-speed relay drive circuit, to ensure the timeliness and accuracy of the exit control operation, avoid system voltage fluctuations, current shocks and other problems caused by improper removal of the faulty module, and ensure that other normal modules can continue to stably supply power to the load and maintain the normal operation of the entire system.

[0088] Corresponding to the inverter power supply flexible control method described in the first embodiment of the present invention, the second embodiment of the present invention further provides an inverter power supply flexible control device, including:

[0089] The parameter acquisition and processing module is used to acquire the operating parameters of the inverter power module in real time and process the operating status data of the inverter power module;

[0090] The synchronous tracking module adopts the digital phase-locked loop technology and combines the synchronous control strategy to synchronously track the bus voltage and the voltage to be incorporated according to the working status data;

[0091] A current distribution module, which calculates and distributes the output current of each inverter power supply module according to the working status data to achieve coordinated operation among the modules;

[0092] The fault monitoring and processing module monitors the operating parameters of the inverter power module in real time. When an abnormality or fault is detected, it decides whether to isolate and exit the faulty module based on the fault type and severity.

[0093] Preferably, the synchronization tracking module is specifically used for:

[0094] Through the detection circuit or algorithm, the phase difference between the output voltage of the inverter power module to be paralleled and the voltage of the operating bus is monitored and compared in real time;

[0095] When the phase difference is within the preset allowable range, the phase locking mechanism is started, and the output phase of the inverter power module to be paralleled is adjusted using the digital phase locking loop technology to synchronize it with the bus voltage phase;

[0096] After the phase is locked, a synchronization instruction is output, and according to the synchronization instruction, the output drive unit is controlled to put the inverter power supply module to be paralleled into the bus system.

[0097] Preferably, the current distribution module is specifically used for:

[0098] According to the number of modules and the total current input parameter, a current sharing algorithm is used to calculate the theoretical current value that should be allocated to each inverter power module;

[0099] Receiving the current value to be distributed to each inverter power module as a control target, and controlling the output current of the inverter power module to be close to or equal to the theoretically calculated distribution current value by controlling the power conversion circuit inside the inverter power module;

[0100] The load current actually output by the inverter power module is detected in real time, and the inverter power module is adjusted in real time according to the deviation between the feedback current and the theoretical distribution current.

[0101] Corresponding to the inverter power supply flexible control method described in the first embodiment of the present invention, the third embodiment of the present invention further provides an inverter power supply flexible control device, including:

[0102] one or more processors;

[0103] Memory;

[0104] One or more applications, wherein the one or more applications are stored in the memory and are configured to be executed by the one or more processors, and the one or more applications are configured to execute the inverter power supply flexible control method.

[0105] Corresponding to the inverter power supply flexible control method described in the aforementioned embodiment 1 of the present invention, embodiment 4 of the present invention further provides a computer program product, including computer instructions, and the computer instructions instruct a computer device to perform operations corresponding to the inverter power supply flexible control method described in the aforementioned embodiment 1 of the present invention.

[0106] Preferably, the processor may be a central processing unit (CPU), or other general-purpose processors, digital signal processors (DSP), application-specific integrated circuits (ASIC), field-programmable gate arrays (FPGA) or other programmable logic devices, discrete gate or transistor logic devices, discrete hardware components, etc. The general-purpose processor may be a microprocessor, or the processor may be any conventional processor. The processor is the control center of the device, and various parts of the device are connected using various interfaces and lines.

[0107] The memory mainly includes a program storage area and a data storage area, wherein the program storage area can store an operating system, an application required for at least one function, etc., and the data storage area can store related data, etc. In addition, the memory can be a high-speed random access memory, or a non-volatile memory, such as a plug-in hard disk, a smart memory card (SmartMedia Card, SMC), a secure digital (Secure Digital, SD) card, and a flash card (Flash Card), etc., or the memory can also be other volatile solid-state storage devices.

[0108] It should be noted that the above-mentioned device may include but is not limited to a processor and a memory, which can be understood by those skilled in the art.

[0109] For the working principle and process of this embodiment, please refer to the description of the aforementioned embodiment 1 of the present invention, which will not be repeated here.

[0110] Compared with the prior art, the beneficial effect brought by the embodiments of the present invention is that the present invention effectively solves the difficult problems of the inverter power supply module in synchronous tracking, parallel current sharing and fault handling, and realizes the flexible online incorporation and exit of the module. The present invention significantly improves the operation and maintenance efficiency, reduces the power outage time caused by online faults, and directly improves the reliability and power quality of the power system. Compared with the prior art, the control method of the present invention is more adaptable, can flexibly respond to changing working environments and emergency dispatch requirements, and significantly enhances the current sharing ability and synchronous tracking accuracy of the mobile inverter power supply when operating in parallel. At the same time, it can quickly and accurately identify and isolate the faulty module, greatly reducing the downtime and maintenance cost of the system. The application of the present invention can not only improve the stability and safety of the power system, but also bring significant economic and social benefits, provide strong support for the intelligent and efficient development of the power industry, and has important promotion and application value.

[0111] The above disclosure is only the preferred embodiment of the present invention, which certainly cannot be used to limit the scope of the present invention. Therefore, equivalent changes made according to the claims of the present invention are still within the scope of the present invention.

Claims

1. A flexible control method for an inverter power supply, characterized in that: include: Step S1, acquiring and processing the operating parameters of the inverter power module in real time to obtain the working status data of the inverter power module; Step S2, according to the working state data of the inverter power module, using the digital phase-locked loop technology and combining with the synchronous control strategy, synchronously tracking the bus voltage and the voltage to be incorporated; Step S3, calculating and distributing the output current of each inverter power module according to the working status data of the inverter power module; Step S4, real-time monitoring of the operating parameters of the inverter power module, when an abnormality or fault is detected, determining whether to isolate and exit the faulty module according to the type and severity of the fault.

2. The method according to claim 1, characterized in that The step S1 specifically includes: Using high-precision sensors, the voltage, current, frequency and temperature of the inverter power module are measured and captured in real time according to certain sampling frequency and accuracy requirements; Perform mathematical calculations on the collected raw data to obtain the frequency, amplitude and phase of parameters such as voltage and current; Use the preset filtering algorithm to digitally filter the collected data to remove interfering noise data; In the framework of the adaptive algorithm, the processed working status data is compared with the preset system performance requirements or standard values ​​to obtain the difference; According to the difference, a corresponding dynamic adjustment output control command is generated to adjust the output of the inverter power module in real time.

3. The method according to claim 1, characterized in that The step S2 specifically includes: Through the detection circuit or algorithm, the phase difference between the output voltage of the inverter power module to be paralleled and the voltage of the operating bus is monitored and compared in real time; When the phase difference is within the preset allowable range, the phase locking mechanism is started, and the output phase of the inverter power module to be paralleled is adjusted using the digital phase locking loop technology to synchronize it with the bus voltage phase; After the phase is locked, a synchronization instruction is output, and according to the synchronization instruction, the output drive unit is controlled to put the inverter power supply module to be paralleled into the bus system.

4. The method according to claim 1, characterized in that: The step S3 specifically includes: Obtain the number of inverter power modules currently in parallel operation and the total current input parameter of the entire parallel system; According to the number of modules and the total current input parameter, a current sharing algorithm is used to calculate the theoretical current value that should be allocated to each inverter power module; Receiving the current value to be distributed to each inverter power module as a control target, and controlling the output current of the inverter power module to be close to or equal to the theoretically calculated distribution current value by controlling the power conversion circuit inside the inverter power module; The load current actually output by the inverter power module is detected in real time, and the inverter power module is adjusted in real time according to the deviation between the feedback current and the theoretical distribution current.

5. The method according to claim 1, characterized in that The step S4 specifically includes: Use high-precision sensors to continuously collect various operating parameters of the inverter power module; When a module that may have a fault is identified, determine whether the faulty module needs to exit the system based on the severity of the fault, the fault type, the current operating load of the system, and the spare capacity of other modules; When it is determined that a module needs to exit the system, the preset fault response procedure is executed and the output relay is controlled to remove the faulty module from the system.

6. A flexible control device for an inverter power supply, characterized in that: include: The parameter acquisition and processing module is used to acquire the operating parameters of the inverter power module in real time and process the operating status data of the inverter power module; The synchronous tracking module adopts the digital phase-locked loop technology and combines the synchronous control strategy to synchronously track the bus voltage and the voltage to be incorporated according to the working status data; A current distribution module, which calculates and distributes the output current of each inverter power supply module according to the working status data to achieve coordinated operation among the modules; The fault monitoring and processing module monitors the operating parameters of the inverter power module in real time. When an abnormality or fault is detected, it decides whether to isolate and exit the faulty module based on the fault type and severity.

7. The device according to claim 6, characterized in that The synchronization tracking module is specifically used for: Through the detection circuit or algorithm, the phase difference between the output voltage of the inverter power module to be paralleled and the voltage of the operating bus is monitored and compared in real time; When the phase difference is within the preset allowable range, the phase locking mechanism is started, and the output phase of the inverter power module to be paralleled is adjusted using the digital phase locking loop technology to synchronize it with the bus voltage phase; After the phase is locked, a synchronization instruction is output, and according to the synchronization instruction, the output drive unit is controlled to put the inverter power supply module to be paralleled into the bus system.

8. The device according to claim 6, characterized in that The current distribution module is specifically used for: According to the number of modules and the total current input parameter, a current sharing algorithm is used to calculate the theoretical current value that should be allocated to each inverter power module; Receiving the current value to be distributed to each inverter power module as a control target, and controlling the output current of the inverter power module to be close to or equal to the theoretically calculated distribution current value by controlling the power conversion circuit inside the inverter power module; The load current actually output by the inverter power module is detected in real time, and the inverter power module is adjusted in real time according to the deviation between the feedback current and the theoretical distribution current.

9. A flexible control device for an inverter power supply, characterized in that: include: one or more processors; Memory; One or more applications, wherein the one or more applications are stored in the memory and configured to be executed by the one or more processors, and the one or more applications are configured to execute the inverter power supply flexible control method according to any one of claims 1 to 5.

10. A computer program product, characterized in that The method comprises computer instructions, wherein the computer instructions instruct a computer device to execute operations corresponding to the method according to any one of claims 1 to 5.

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