Cooperative control method and system of multi-module converter

Abstract

This application provides a collaborative control method and system for multi-module converters, relating to the field of converter control technology. The method includes: acquiring multiple real-time operating states and multiple real-time loads of multiple converter modules; invoking user load requirements to determine the converter's operating mode; generating an initial control strategy based on the multiple real-time operating states; optimizing the initial control strategy according to the collaborative control objective to obtain a control optimization strategy; and constructing a standard interpolation frame for modular management of the converter. This application solves the technical problem of low collaborative control efficiency caused by the relatively fixed power combination method of converters, making it difficult to flexibly adjust according to actual needs. By adjusting the converter's operating mode in real time based on the real-time loads, operating states, and user load requirements of multiple modules, more precise load allocation and power scheduling are achieved, improving the collaborative control efficiency of the converter.

Description

Technical Field

[0001] This application relates to the field of converter control technology, and in particular to a collaborative control method and system for multi-module converters. Background Technology

[0002] In existing power electronic systems, converters, as one of the core components, are widely used in variable frequency speed control, new energy power generation, and energy storage systems. Currently, a large portion of the converters on the market are high-power, lacking a modular, plug-in-frame strategy for low-power energy storage converters. Low-power energy storage converters typically need to handle complex power load demands and variable environmental conditions, thus requiring efficient power conversion, stable grid connection capabilities, and flexible load regulation. Traditional converter systems have relatively fixed power combination methods, and the power output and operating modes of individual modules often cannot be dynamically adjusted in real time according to actual load demands and environmental changes. This leads to low collaborative control efficiency of multi-module converters under partial load conditions, failing to achieve optimal energy utilization. Especially in scenarios with large load fluctuations or rapid changes in demand, the inability to flexibly adjust operating modes results in uneven power distribution, overload of certain modules, or power waste.

[0003] In summary, existing technologies suffer from the problem that the power combination of converters is relatively fixed, making it difficult to flexibly adjust according to actual needs, resulting in low efficiency of converter coordinated control. Summary of the Invention

[0004] The purpose of this application is to provide a collaborative control method and system for multi-module converters, in order to solve the technical problem in the prior art where the power combination of converters is relatively fixed and it is difficult to flexibly adjust it according to actual needs, resulting in low collaborative control efficiency of converters.

[0005] In view of the above problems, this application provides a collaborative control method and system for multi-module converters.

[0006] Firstly, this application provides a collaborative control method for multi-module converters. This method is implemented through a collaborative control system for multi-module converters. The collaborative control method includes: acquiring multiple real-time operating states and multiple real-time loads of multiple converter modules; invoking user load requirements and determining the converter operating mode based on the multiple real-time loads; generating an initial control strategy based on the converter operating mode and the multiple real-time operating states; optimizing the initial control strategy according to the collaborative control objective to obtain a control optimization strategy; and constructing a standard interpolation frame based on the control optimization strategy to perform modular management of the converters.

[0007] Optionally, the standard socket includes a slot, a bus power supply, a control module, a surge protection module, a disconnect switch, a power meter contactor, multiple converter modules, and a shunt.

[0008] Optionally, based on the user load requirements, the maximum load power, average load power, and output voltage range are extracted; multiple rated powers and multiple voltage ranges of the multiple converter modules are obtained; the number of converters is determined based on the maximum load power, the average load power, and the multiple rated powers; and the converter operating mode is determined based on the output voltage range and the multiple voltage ranges, combined with the number of converters, wherein the converter operating mode includes parallel operating mode, series operating mode, and hybrid operating mode.

[0009] Optionally, the average of the multiple rated power values ​​is calculated to obtain the rated average power; the number of first converters is calculated based on the maximum load power and the rated average power, and the number of second converters is calculated based on the average load power and the rated average power; a load fluctuation sequence is obtained from the central control unit, and a load factor is calculated; if the load factor is greater than or equal to a preset threshold, the number of first converters is used as the number of converters; if the load factor is less than the preset threshold, the number of second converters is used as the number of converters.

[0010] Optionally, step a: Obtain a first real-time operating state from the plurality of real-time operating states, and upload it to the central control unit for judgment via a communication interface; step b: If the first real-time operating state does not meet the preset state, remove the first converter module corresponding to the first real-time operating state; repeat steps a to b for the plurality of real-time operating states to obtain all the plurality of preferred converter modules that meet the preset state; obtain external power grid information from the central control unit; generate the initial control strategy based on the converter operating mode, the plurality of preferred converter modules, and the external power grid information.

[0011] Optionally, the external power grid information includes power grid voltage fluctuations, power grid load fluctuations, and power grid frequency fluctuations.

[0012] Optionally, an objective function is determined based on maximizing load adaptation and power efficiency as the objectives of the coordinated control; constraints are determined based on the maximum voltage limit, maximum power limit, and grid fluctuation limit of the multiple converter modules; based on the constraints, the initial control decision is cross-mutated to obtain a control decision mutation domain; and based on the objective function, the control optimization strategy is determined in the control decision mutation domain.

[0013] Secondly, this application also provides a collaborative control system for multi-module converters, used to execute the collaborative control method for multi-module converters as described in the first aspect. The collaborative control system for multi-module converters includes: a converter information acquisition module, used to acquire multiple real-time operating states and multiple real-time loads of multiple converter modules; a working mode determination module, used to invoke user load requirements and determine the converter working mode based on the multiple real-time loads; an initial strategy generation module, used to generate an initial control strategy based on the converter working mode and the multiple real-time operating states; a strategy optimization module, used to optimize the initial control strategy according to the collaborative control objective to obtain a control optimization strategy; and a frame construction module, used to construct standard frames based on the control optimization strategy to perform modular management of the converters.

[0014] One or more technical solutions provided in this application have at least the following beneficial effects:

[0015] By acquiring multiple real-time operating states and multiple real-time loads from multiple converter modules, invoking user load requirements, and determining the converter operating mode based on the multiple real-time loads, an initial control strategy is generated according to the converter operating mode and the multiple real-time operating states. Based on the collaborative control objective, the initial control strategy is optimized to obtain a control optimization strategy. Based on the control optimization strategy, a standard interpolation frame is constructed for modular management of the converter. In other words, by using the real-time loads, operating states, and user load requirements of multiple converter modules, the operating mode of the converter is adjusted in real time, achieving more precise load allocation and power scheduling, thus improving the collaborative control efficiency of the converter.

[0016] The above description is merely an overview of the technical solution of this application. To better understand the technical means of this application and to facilitate its implementation according to the description, and to make the above and other objects, features, and advantages of this application more apparent, specific embodiments of this application are described below. It should be understood that the content described in this section is not intended to identify key or important features of the embodiments of this application, nor is it intended to limit the scope of this application. Other features of this application will become readily apparent through the following description. Attached Figure Description

[0017] To more clearly illustrate the technical solutions in this application or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are merely exemplary. For those skilled in the art, other drawings can be obtained based on the provided drawings without creative effort.

[0018] Figure 1This is a flowchart illustrating the collaborative control method for the multi-module converter of this application;

[0019] Figure 2 This is a schematic diagram of the structure of the collaborative control system for the multi-module converter in this application.

[0020] Figure labeling: 11 Converter information acquisition module, 12 Operating mode determination module, 13 Initial strategy generation module, 14 Strategy optimization module, 15 Frame construction module. Detailed Implementation

[0021] This application provides a collaborative control method and system for multi-module converters, solving the technical problem in existing technologies where the fixed power combination of converters makes it difficult to flexibly adjust according to actual needs, resulting in low collaborative control efficiency. By monitoring the real-time load, operating status, and user load demands of multiple converter modules, the operating mode of the converters is adjusted in real time, achieving more precise load allocation and power scheduling, thus improving the collaborative control efficiency of the converters.

[0022] The technical solutions of this application will now be clearly and completely described with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of this application, and not all of them. It should be understood that this application is not limited to the exemplary embodiments described herein. All other embodiments obtained by those skilled in the art based on the embodiments of this application without creative effort are within the scope of protection of this application. It should also be noted that, for ease of description, only the parts related to this application are shown in the accompanying drawings, not all of them.

[0023] Example 1, please refer to the appendix. Figure 1 This application provides a collaborative control method for a multi-module converter, wherein the collaborative control method for the multi-module converter is executed by a collaborative control system of the multi-module converter, and the collaborative control method for the multi-module converter specifically includes the following steps:

[0024] S100: Obtain multiple real-time operating states and multiple real-time loads of multiple converter modules.

[0025] Specifically, a converter module is the core device unit in an energy storage system used to convert direct current (DC) to alternating current (AC). In a multi-module converter system, multiple converter modules can work together in parallel or series to meet higher power demands or improve system reliability. Real-time operating status refers to the constantly changing parameters of the converter module during actual operation, such as output power, voltage, current, and temperature. Real-time operating status reflects the health and efficiency of each converter module. Real-time load refers to the current power demand connected to the converter system, usually expressed in power (watts or kilowatts). Load changes constantly; for example, the power demand of household or industrial equipment differs between day and night or under different weather conditions.

[0026] The system integrates sensors and data acquisition modules to monitor parameters such as output voltage, output current, power, and potential temperature of each module, transmitting this data to the central control unit. Real-time load refers to the current power demand; the system monitors real-time changes in each load and transmits load data in real time. By acquiring the real-time operating status and load of multiple converter modules, the system accurately understands the operating condition and load requirements of each module, ensuring that the converter can dynamically adapt to different load demands and operating environments. This avoids problems such as power waste and module overload caused by load fluctuations or abnormal module states.

[0027] S200: Invoke user load requirements and determine the converter operating mode based on the multiple real-time loads.

[0028] Furthermore, this application S200 includes:

[0029] Based on the user load requirements, the maximum load power, average load power, and output voltage range are extracted; multiple rated powers and multiple voltage ranges of the multiple converter modules are obtained; the number of converters is determined based on the maximum load power, the average load power, and the multiple rated powers; the converter operating mode is determined based on the output voltage range and the multiple voltage ranges, combined with the number of converters, wherein the converter operating mode includes parallel operating mode, series operating mode, and hybrid operating mode.

[0030] Specifically, user load demand refers to the actual power demand of the load end (such as communication base stations, IDC data centers, etc.), typically including maximum power demand, average power demand, and voltage demand. Load demand is a core reference factor for the design and control of modular plug-in rack solutions for converters. For example, communication base stations, IDC data centers, residential equipment, and small commercial and industrial storage facilities all have different power requirements. The maximum power demand of a user load refers to the maximum power load that needs to be carried within a specific period, usually occurring during peak system load periods. Average load power refers to the average power demand of the load over a certain time period. Compared to maximum load power, average load power better reflects the stable power demand over a long period. Output voltage range refers to the range of voltage values ​​that the converter can output, including DC and AC voltages, to meet different types of load demands. For example, assuming a communication equipment room has a maximum load power demand of 6kW, an average load power demand of 4kW, and a voltage demand of AC220V, it is necessary to ensure that the converter can provide at least 6kW of power and that the output voltage meets the AC220V requirement.

[0031] Determining the rated power and voltage range of the converter module according to its manufacturer's specifications—that is, the range of output power and voltage the converter can continuously provide under standard operating conditions—helps determine whether multiple converter modules are needed to meet load requirements. The rated power of a converter module is typically 3-5kW, while its voltage range includes DC (DC40-400V) and AC (AC220V / AC380V).

[0032] The minimum number of converters required is determined by dividing the maximum load power by the rated power of a single converter module. The number of converters required under normal conditions is determined by dividing the average load power by the rated power of a single converter module. After determining the number of converters, a suitable operating mode is selected based on the voltage requirements of the user load and the voltage range of each converter module. If the load requires a higher voltage, converter modules may need to be connected in series; if the load requires a higher current, a parallel operating mode can be used. A mixed operating mode is suitable for situations requiring both higher voltage and higher current.

[0033] Parallel operation mode involves multiple converter modules operating in parallel, with combined output currents but consistent voltage, suitable for scenarios with high current requirements. Series operation mode involves multiple converter modules operating in series, with superimposed output voltages but consistent current. This mode is suitable for loads requiring higher voltages. Hybrid operation mode combines parallel and series modes, with modules in both parallel and series combinations, adapting to more complex load requirements and suitable for scenarios where both voltage and current need to be considered simultaneously.

[0034] By considering the user's load requirements, the rated power of the converter modules, and the voltage range, the required number of converter modules and the appropriate operating mode can be flexibly determined. Through reasonable power allocation and operating mode selection, overload or voltage mismatch issues in a single operating mode are avoided, thus improving the energy efficiency and reliability of the converter modules.

[0035] Furthermore, this application also includes the following steps:

[0036] Calculate the average of the multiple rated power values ​​to obtain the rated average power; calculate the number of first converters based on the maximum load power and the rated average power, and simultaneously calculate the number of second converters based on the average load power and the rated average power; obtain the load fluctuation sequence from the central control unit and calculate the load factor; if the load factor is greater than or equal to a preset threshold, then the number of first converters is used as the number of converters; if the load factor is less than the preset threshold, then the number of second converters is used as the number of converters.

[0037] Specifically, the rated power of each converter module is within a standard range, but there are certain differences. Therefore, it is necessary to calculate the average rated power of all converter modules. For example, assuming there are 5 converter modules with rated powers of 4kW, 4.5kW, 4kW, 5kW, and 4.5kW respectively, the average rated power is 4.4kW. This assesses the overall power capability of the converter to provide a standard value for subsequent calculations.

[0038] Based on user load demand and rated average power, calculate the required number of converters. The first number of converters, required for extreme load conditions, is calculated using the ratio of maximum load power to rated average power. The second number of converters, required for normal load conditions, is calculated using the ratio of average load power to rated average power. The first number of converters is to ensure the system can handle scenarios with large load fluctuations. The second number of converters is used when load fluctuations are normal or load demand is low.

[0039] The central control unit (CCU) is a controller responsible for monitoring, scheduling, and optimizing the system. It receives real-time operating data from each module and adjusts the converter configuration according to load demand. The CCU obtains load fluctuation sequences, typically load power changes over a past period. The load factor is obtained by calculating the average and maximum load of this sequence. The load factor is the ratio of the average load to the maximum load, reflecting load volatility. For example, assuming the maximum load power over a past period is 8kW and the average load power is 6kW, the load factor is 0.75.

[0040] Based on historical load data, a threshold is set. Loads exceeding this threshold are considered extreme loads, while loads below it are considered normal loads. The average load power over a period of time is used; for example, load fluctuations within 90% are considered normal loads, while load power exceeding 90% of past peak loads, indicating a short-term load surge, is considered an extreme load. By acquiring load fluctuation sequences in real time and calculating load factors, the trend of load changes can be determined, allowing for flexible adjustments to the number and operating modes of converters. This avoids unnecessary resource waste, reduces energy loss, and effectively improves system energy efficiency.

[0041] S300: Generate an initial control strategy based on the converter's operating mode and the multiple real-time operating states.

[0042] Furthermore, this application S300 includes:

[0043] Step a: Obtain the first real-time operating state from the plurality of real-time operating states and upload it to the central control unit for judgment via the communication interface; Step b: If the first real-time operating state does not meet the preset state, remove the first converter module corresponding to the first real-time operating state; For the plurality of real-time operating states, repeat steps a to b to obtain all the plurality of preferred converter modules that meet the preset state; Obtain external power grid information from the central control unit; Generate the initial control strategy based on the converter operating mode, the plurality of preferred converter modules, and the external power grid information.

[0044] The external power grid information includes power grid voltage fluctuations, power grid load fluctuations, and power grid frequency fluctuations.

[0045] Specifically, a first real-time operating state is randomly selected from multiple real-time operating states. This first state includes parameters such as current, voltage, and power of the corresponding converter module. This data can be uploaded to the central control unit via a communication interface (such as Modbus or CAN bus). A preset state refers to a specific operating state that the converter module should achieve according to design or operational requirements. For example, temperature range or power output range can be set as standards. If the converter's operating state does not meet these standards, it is considered not to meet the preset state.

[0046] The central control unit will judge the uploaded first real-time operating status. If the first real-time operating status does not meet the preset status, it means that the operating status of this sensor module does not meet the preset requirements. The central control unit will decide to remove the converter module, that is, exclude the module from the collaborative control. Continue to obtain the real-time status from other converter modules, and repeat steps a and b, until all converter modules that meet the preset requirements are selected.

[0047] By repeatedly executing steps a and b, multiple preferred converter modules are selected, which meet preset operating state requirements. For example, in a group of 5 converter modules, if 3 converters meet the preset state while 2 fail to meet the requirements, the 3 modules that meet the conditions will ultimately be retained. External grid information is acquired through measurement sensors, communication interfaces, or the grid dispatch system. The converters periodically request this external grid data from the central control unit or dispatch system to adjust their operating strategies in real time. External grid information refers to relevant data from the grid side, including grid voltage, grid frequency, load demand, and power quality. The converters adjust their operating strategies based on changes in the external grid using this information.

[0048] Grid voltage fluctuation refers to the degree of change in grid output voltage over a certain period of time. Voltage fluctuations may be caused by load changes, equipment failures, or other external factors. Excessive grid voltage fluctuations may affect the normal operation of converters, thus requiring real-time monitoring. Grid load fluctuation refers to changes in load demand within the grid. As user electricity demand changes, the grid load will also fluctuate. Grid frequency fluctuation refers to changes in grid frequency over a certain period of time; typically, the grid frequency should be maintained at 50Hz or 60Hz (depending on the region).

[0049] Based on the determined converter operating mode and the number and capacity of converter modules required for that mode, the final control strategy is determined from a pool of pre-selected preferred converter modules. If multiple preferred converter modules meet the criteria, parallel, series, or hybrid modes are selected to achieve the required power output and voltage requirements. For example, assuming a higher voltage output is required but the load demand is large, multiple converter modules are connected in series (series operating mode) to provide a high voltage output and ensure voltage stability.

[0050] Through the optimization module, the central control unit can understand the real-time status of each converter (such as power output, voltage, current, etc.) and select the optimal converter combination to meet load demands. After acquiring external grid information, the central control unit will further adjust its strategy. For example, if the grid voltage fluctuates significantly (e.g., voltage fluctuates between DC48V and DC45V), the system output voltage can be stabilized by adding parallel modules or adjusting the module operating modes.

[0051] The central control unit generates an initial control strategy based on all information, defining the converter's operating mode, module combination, power distribution method, and how to respond to grid changes. This strategy is applied to the coordinated control of the converter modules to ensure efficient and stable operation. The initial control strategy is a coordinated control scheme generated based on the converter's operating mode, the optimal state of the converter modules, and the conditions of the external grid. It mainly guides the converter modules on how to work together to achieve power balance, stable voltage output, and respond to grid fluctuations.

[0052] By acquiring external power grid information in real time and flexibly adjusting the converter's operating mode according to the power grid status, the converter can automatically adapt to power grid fluctuations or load changes. This ensures that the power and voltage distribution can be optimized according to load demand and power grid conditions, avoiding overload or voltage instability. As a result, the communication base station is guaranteed to have a continuous and stable power supply, while avoiding the impact of voltage fluctuations on the base station equipment.

[0053] S400: Based on the cooperative control objective, optimize the initial control decision to obtain a control optimization strategy.

[0054] Furthermore, this application S400 includes:

[0055] The objective function is determined based on maximizing load adaptation and power efficiency of the cooperative control objectives; the constraints are determined based on the maximum voltage limit, maximum power limit, and grid fluctuation limit of the multiple converter modules; the initial control decision is cross-mutated based on the constraints to obtain the control decision mutation domain; and the control optimization strategy is determined in the control decision mutation domain based on the objective function.

[0056] Specifically, the goal of coordinated control in a multi-converter system is to achieve optimized performance by having converter modules work collaboratively to meet specific requirements, including maximizing load fit and power efficiency. Maximizing load fit refers to the rational allocation and scheduling of converter modules based on load demand to ensure that load requirements are fully met, considering not only peak load demand but also load fluctuations and stability. Maximizing power efficiency refers to achieving maximum operating efficiency by rationally configuring the operating modes of converter modules and adjusting power distribution, thereby reducing energy loss and achieving energy savings.

[0057] An objective function is a mathematical expression used to quantify an optimization objective. In cooperative control, the objective function typically incorporates multiple factors, such as load adaptability and power efficiency, to describe the target to be optimized. The objective function needs to consider factors such as load adaptability and power efficiency, and combine different control strategies to arrive at a quantified target value. The objective function is determined by a weighted sum of load adaptability and power efficiency.

[0058] Constraints are limiting factors in the control optimization process, ensuring that the control decisions generated during optimization are reasonable and feasible. For example, maximum voltage limits ensure that the converter's output voltage does not exceed the maximum voltage the equipment can withstand; maximum power limits ensure that the converter does not operate under overload; grid fluctuation limits ensure that the converter's output can cope with fluctuations in the external grid. For example, the converter's output voltage cannot exceed the system's rated voltage range (e.g., 400V); the power output of a single converter cannot exceed its rated power (e.g., 5kW); and it must be able to cope with grid voltage fluctuations, such as ±10%.

[0059] Based on the existing initial control strategy, crossover and mutation operations are used to generate new control decisions. Crossover combines the advantages of different control decisions, while mutation explores new solutions within the control decision space. Crossover generates new solutions by combining partial information from two options, while mutation increases the diversity of the solution space by randomly altering the options. The combination of both effectively explores and optimizes the objective function. The control decision mutation domain refers to the set of possible control decisions generated through crossover and mutation operations, representing different control strategies within which further optimization searches can be performed.

[0060] Evaluating all strategies in the control decision variation domain based on the objective function to find the optimal control decision is the so-called control optimization strategy. This final solution, optimized through multiple crossover and mutation operations, maximizes load adaptation and power efficiency while satisfying all constraints. By using optimization operations such as crossover and mutation to maximize load adaptation and power efficiency according to the objective function, the optimal control strategy is found, ensuring that all constraints, such as maximum voltage limits and maximum power limits, are met, thus avoiding the risk of system overload or instability.

[0061] S500: Based on the control optimization strategy, a standard interlocking frame is constructed to perform modular management of the converter.

[0062] The standard socket includes a slot, a bus power supply, a control module, a surge protection module, a disconnect switch, a power meter contactor, multiple converter modules, and a shunt.

[0063] Specifically, based on the optimized control optimization strategy, a standardized interlocking frame system is constructed to achieve modular management of converter modules. Through the design of the standard interlocking frame, the operating states, maintenance, and expansion of multiple converter modules are organized and controlled. The most suitable control scheme, such as parallel, series, or hybrid operating modes, is determined through optimization algorithms, which in turn determines the operating state and output power characteristics of the converter modules.

[0064] A standard bay is a pre-designed hardware frame used to house and manage multiple converter modules. By providing standardized slots and connection ports, it enables easy installation, removal, and maintenance of converter modules, thus achieving modular management. Standard bays are typically designed with a modular structure to support rapid expansion or replacement of converter modules.

[0065] A standard junction box includes slots, a power supply unit, a control module, a surge protection module, a disconnect switch, a power meter contactor, multiple converter modules, and a shunt. The slots are spaces specifically designed for installing converter modules; each slot can accommodate one converter module, ensuring easy insertion and removal while maintaining good electrical connection. The power supply unit centrally connects the power inputs of multiple converter modules, bringing their power lines together on a common power line for easier power distribution and management. The control module is responsible for the control and monitoring functions of the entire standard junction box system. Through communication with the converter modules, it schedules, coordinates, and monitors their status, ensuring they operate according to optimized control strategies. The surge protection module protects the converter modules from lightning strikes and overvoltages, typically including surge arresters and overvoltage protection devices to prevent damage to the system from lightning currents in the power grid or external power sources. Disconnect switches are used to cut off the current flow to a converter module when the module malfunctions or needs maintenance, thereby ensuring safe operation, isolating the power supply, and preventing other parts of the system from being affected.

[0066] Power meter contactors are used to monitor parameters such as current, voltage, and power, and measure power consumption in real time through connection with the meter. They are typically integrated into converter modules to provide real-time data on system operation. A converter module is a device used to convert direct current (DC) to alternating current (AC) or vice versa. A shunt is a device used to distribute current among multiple converter modules or different circuits, ensuring even current distribution across different modules, thereby achieving load balancing and preventing overload.

[0067] When used in parallel, the standard module frame enables compartmentalized management, single-group management, easy maintenance, and high security. It also allows for intelligent mixed use and intelligent operation and maintenance, and can supply power to the grid. This not only provides backup power and peak-valley arbitrage but also responds to grid dispatch. When used in series, the standard module frame can accommodate a maximum voltage of DC400V, supporting up to 7 modules in series, reducing current consumption. The converter modules can be used in parallel for capacity expansion, essentially solving the application problems of small-scale industrial and commercial power storage. The converter modules can be modularly managed and their power output can be increased.

[0068] With standard slot-mount frames, all converter modules can be easily managed. Different modules work collaboratively according to control optimization strategies, enabling flexible expansion and replacement, and simplifying system maintenance, monitoring, and management. The standardized slot-mount design allows for easy addition or removal of converter modules as needed, supporting flexible expansion and replacement. Each converter module and related components (such as power supplies and control modules) are managed uniformly via slots, facilitating installation, replacement, and maintenance.

[0069] In summary, the collaborative control method for multi-module converters provided in this application has the following beneficial effects:

[0070] By acquiring multiple real-time operating states and multiple real-time loads from multiple converter modules, invoking user load requirements, and determining the converter operating mode based on the multiple real-time loads, an initial control strategy is generated according to the converter operating mode and the multiple real-time operating states. Based on the collaborative control objective, the initial control strategy is optimized to obtain a control optimization strategy. Based on the control optimization strategy, a standard interpolation frame is constructed for modular management of the converter. In other words, by using the real-time loads, operating states, and user load requirements of multiple converter modules, the operating mode of the converter is adjusted in real time, achieving more precise load allocation and power scheduling, thus improving the collaborative control efficiency of the converter.

[0071] Example 2: Based on the same inventive concept as the cooperative control method for multi-module converters in Example 1, this application also provides a cooperative control system for multi-module converters. Please refer to the appendix. Figure 2 The collaborative control system for the multi-module converter includes:

[0072] The converter information acquisition module 11 is used to acquire multiple real-time operating states and multiple real-time loads of multiple converter modules; the operating mode determination module 12 is used to call user load requirements and determine the converter operating mode based on the multiple real-time loads; the initial strategy generation module 13 is used to generate an initial control strategy based on the converter operating mode and the multiple real-time operating states; the strategy optimization module 14 is used to optimize the initial control strategy according to the collaborative control objective to obtain a control optimization strategy; and the frame construction module 15 is used to construct standard frames based on the control optimization strategy to perform modular management of the converter.

[0073] Furthermore, the operating mode determination module 12 in the collaborative control system of the multi-module converter is also used for:

[0074] Based on the user load requirements, the maximum load power, average load power, and output voltage range are extracted; multiple rated powers and multiple voltage ranges of the multiple converter modules are obtained; the number of converters is determined based on the maximum load power, the average load power, and the multiple rated powers; the converter operating mode is determined based on the output voltage range and the multiple voltage ranges, combined with the number of converters, wherein the converter operating mode includes parallel operating mode, series operating mode, and hybrid operating mode.

[0075] Furthermore, the operating mode determination module 12 in the collaborative control system of the multi-module converter is also used for:

[0076] Calculate the average of the multiple rated power values ​​to obtain the rated average power; calculate the number of first converters based on the maximum load power and the rated average power, and simultaneously calculate the number of second converters based on the average load power and the rated average power; obtain the load fluctuation sequence from the central control unit and calculate the load factor; if the load factor is greater than or equal to a preset threshold, then the number of first converters is used as the number of converters; if the load factor is less than the preset threshold, then the number of second converters is used as the number of converters.

[0077] Furthermore, the initial strategy generation module 13 in the cooperative control system of the multi-module converter is also used for:

[0078] Step a: Obtain the first real-time operating state from the plurality of real-time operating states and upload it to the central control unit for judgment via the communication interface; Step b: If the first real-time operating state does not meet the preset state, remove the first converter module corresponding to the first real-time operating state; For the plurality of real-time operating states, repeat steps a to b to obtain all the plurality of preferred converter modules that meet the preset state; Obtain external power grid information from the central control unit; Generate the initial control strategy based on the converter operating mode, the plurality of preferred converter modules, and the external power grid information.

[0079] Furthermore, the initial strategy generation module 13 in the cooperative control system of the multi-module converter is also used for:

[0080] The external power grid information includes power grid voltage fluctuations, power grid load fluctuations, and power grid frequency fluctuations.

[0081] Furthermore, the strategy optimization module 14 in the collaborative control system of the multi-module converter is also used for:

[0082] The objective function is determined based on maximizing load adaptation and power efficiency of the cooperative control objectives; the constraints are determined based on the maximum voltage limit, maximum power limit, and grid fluctuation limit of the multiple converter modules; the initial control decision is cross-mutated based on the constraints to obtain the control decision mutation domain; and the control optimization strategy is determined in the control decision mutation domain based on the objective function.

[0083] Furthermore, the interpolation frame construction module 15 in the collaborative control system of the multi-module converter is also used for:

[0084] The standard socket includes a slot, a bus power supply, a control module, a surge protection module, a disconnect switch, a power meter contactor, multiple converter modules, and a shunt.

[0085] The various embodiments in this specification are described in a progressive manner, with each embodiment focusing on its differences from other embodiments. Figure 1 The collaborative control method and specific examples of the multi-module converter in Embodiment 1 are also applicable to the collaborative control system of the multi-module converter in this embodiment. Through the foregoing detailed description of the collaborative control method of the multi-module converter, those skilled in the art can clearly understand the collaborative control system of the multi-module converter in this embodiment. Therefore, for the sake of brevity, it will not be described in detail here. As for the system disclosed in the embodiments, since it corresponds to the method disclosed in the embodiments, the description is relatively simple; relevant details can be found in the method section.

[0086] The above description of the disclosed embodiments enables those skilled in the art to make or use this application. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of this application. Therefore, this application is not to be limited to the embodiments shown herein, but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.

[0087] Obviously, those skilled in the art can make several improvements and modifications to this application without departing from the principles of this application, and these improvements and modifications also fall within the protection scope of this application.

Claims

1. A collaborative control method for multi-module converters, characterized in that, include: Obtain multiple real-time operating states and multiple real-time loads of multiple converter modules; The system calls upon user load requirements and determines the converter's operating mode based on the multiple real-time loads. Based on the converter's operating mode and the multiple real-time operating states, an initial control strategy is generated. Based on the cooperative control objective, the initial control strategy is optimized to obtain a control optimization strategy; Based on the aforementioned control optimization strategy, a standard interpolation frame is constructed to perform modular management of the converter; Based on the user load demand and the multiple real-time loads, the converter operating mode is determined, including: Based on the user load requirements, extract the maximum load power, average load power, and output voltage range; Obtain multiple rated power and multiple voltage ranges of the multiple converter modules; The number of converters is determined based on the maximum load power, the average load power, and the plurality of rated power. Based on the output voltage range and the plurality of voltage ranges, and in combination with the number of converters, the converter operating mode is determined, wherein the converter operating mode includes parallel operating mode, series operating mode and hybrid operating mode; Determining the required number of converters based on the maximum load power, the average load power, and the plurality of rated power includes: Calculate the average of the multiple rated power values ​​to obtain the rated average power; The number of first converters is calculated based on the maximum load power and the rated average power. At the same time, the number of second converters is calculated based on the average load power and the rated average power. Obtain the load fluctuation sequence from the central control unit and calculate the load factor; If the load factor is greater than or equal to a preset threshold, then the number of the first converters is taken as the number of converters. If the load factor is less than the preset threshold, then the number of the second converter is taken as the number of converters; Based on the cooperative control objective, the initial control strategy is optimized to obtain a control optimization strategy, including: The objective function is determined based on maximizing load adaptation and power efficiency as the objectives of the coordinated control. The constraints are determined based on the maximum voltage limit, maximum power limit, and grid fluctuation limit of the multiple converter modules; Based on the constraints, the initial control strategy is subjected to cross-mutation to obtain the control decision mutation domain; Based on the objective function, the control optimization strategy is determined in the control decision variation domain.

2. The collaborative control method for a multi-module converter according to claim 1, characterized in that, The standard socket includes a slot, a bus power supply, a control module, a surge protection module, a disconnect switch, a power meter contactor, multiple converter modules, and a shunt.

3. The collaborative control method for a multi-module converter according to claim 1, characterized in that, Based on the converter's operating mode and the multiple real-time operating states, an initial control strategy is generated, including: Step a: Obtain the first real-time operating status from the multiple real-time operating statuses, and upload it to the central control unit for judgment via the communication interface; Step b: If the first real-time operating state does not meet the preset state, then remove the first converter module corresponding to the first real-time operating state; For the multiple real-time operating states, repeat steps a to b to obtain all the preferred converter modules that satisfy the preset states; Obtain external power grid information from the central control unit; The initial control strategy is generated based on the converter operating mode, the multiple preferred converter modules, and the external power grid information.

4. The collaborative control method for a multi-module converter according to claim 3, characterized in that, The external power grid information includes power grid voltage fluctuations, power grid load fluctuations, and power grid frequency fluctuations.

5. A collaborative control system for multi-module converters, characterized in that, The step of implementing the cooperative control method for the multi-module converter according to any one of claims 1 to 4, wherein the cooperative control system for the multi-module converter includes: The converter information acquisition module is used to acquire multiple real-time operating states and multiple real-time loads of multiple converter modules; The operating mode determination module is used to call the user's load requirements and determine the converter's operating mode based on the multiple real-time loads. The initial strategy generation module is used to generate an initial control strategy based on the converter's operating mode and the multiple real-time operating states. The strategy optimization module is used to optimize the initial control strategy according to the cooperative control objective to obtain a control optimization strategy; The interlocking frame construction module is used to construct standard interlocking frames based on the control optimization strategy to perform modular management of the converter.

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