A multi-module auxiliary inverter and power supply device

Abstract

The present application relates to the field of power electronics technology, and in particular to a multi-module auxiliary inverter and power supply device, wherein the multi-module auxiliary inverter includes a control module and several parallel inverter modules, each of which includes several DCDC submodules and one DCAC submodule; the control module, the DCDC submodule and the DCAC submodule are all connected to a Can communication bus; the control module obtains a first state value of each DCDC submodule and a second state value of each DCAC submodule through the Can communication bus; based on the first state value and the second state value, each DCDC submodule and each DCAC submodule are controlled to stop and work respectively. The present application can reduce the impact caused by a small number of components, sensors, and submodule abnormalities, and improve the reliability and practicality of the entire system.

Description

Technical Field

[0001] The present application relates to the field of power electronics technology, and in particular to a multi-module auxiliary inverter and a power supply device. Background Art

[0002] The multi-modular power supply system has always attracted the attention of the industry, because the modular design can make the system capacity configuration more flexible, and at the same time, the system has an intermediate state in addition to the normal state and the fault state during the process, which not only prevents the power supply system from being completely disabled in the event of a single or a small number of component failures. In the existing multi-modular technology, when a large-capacity module is decomposed into a small-capacity module, the number of modules increases simultaneously, and the number of components increases, resulting in an increased probability of system abnormalities. How to reduce the impact of component failure is an urgent problem that needs to be solved now. Summary of the invention

[0003] In view of the above problems, the present application proposes a multi-module auxiliary inverter and a power supply device.

[0004] The embodiment of the present application provides a multi-module auxiliary inverter, comprising a control module and a plurality of parallel inverter modules, each of the inverter modules comprising a plurality of DCDC submodules and a DCAC submodule;

[0005] The control module, the DCDC submodule and the DCAC submodule are all connected to a Can communication bus;

[0006] The control module obtains a first state value of each of the DCDC submodules and a second state value of each of the DCAC submodules through the Can communication bus; based on the first state value and the second state value, the control module controls the stopping and working of each of the DCDC submodules and each of the DCAC submodules respectively.

[0007] Further, in the above-mentioned multi-module auxiliary inverter, the stopping and working of each of the DCDC submodules and each of the DCAC submodules are controlled based on the first state value and the second state value, respectively, including:

[0008] Based on the first state value and the second state value, respectively obtain the working state of each of the DCDC submodules and the working state of each of the DCAC submodules, wherein the working state includes an abnormal state and a normal state;

[0009] When the working state of a certain DCDC submodule is abnormal, the inverter module corresponding to the DCDC submodule is controlled to stop working, and DCDC module abnormality information is generated;

[0010] Transmitting the abnormal information of the DCDC module to the DCAC submodule in the inverter module to instruct the DCAC submodule to adjust the output power;

[0011] When the adjustment completion information sent by the DCAC submodule is received, the DCDC submodule and the DCAC submodule in the inverter module in normal state are controlled to work.

[0012] Furthermore, in the above-mentioned multi-module auxiliary inverter, it includes:

[0013] When the working state of a certain DCAC submodule is abnormal, the inverter module corresponding to the DCAC submodule is controlled to stop working.

[0014] Furthermore, in the above-mentioned multi-module auxiliary inverter, it also includes:

[0015] Based on the first state value and the second state value, compare the preset state table to obtain weighted scores corresponding to all DCDC submodules and all DCAC submodules respectively;

[0016] Based on the weighted scores corresponding to all DCDC submodules and all DCAC submodules, it is determined whether the multi-module auxiliary inverter meets the power requirement of the current whole machine output load capacity.

[0017] Further, in the above-mentioned multi-module auxiliary inverter, the preset state table includes a preset DCDC state table and a preset DCAC state table; the weighted scores corresponding to all DCDC submodules and all DCAC submodules are obtained by comparing the preset state table with the weighted scores corresponding to all DCDC submodules and all DCAC submodules, respectively, including:

[0018] Based on each of the first state values, compare the preset DCDC state table to obtain first weighted scores corresponding to all DCDC sub-modules;

[0019] Based on each of the second state values, the second weighted scores corresponding to all DCAC sub-modules are obtained by comparing with the preset DCAC state table.

[0020] Further, in the above-mentioned multi-module auxiliary inverter, based on the weighted scores corresponding to all DCDC sub-modules and all DCAC sub-modules, it is judged whether the multi-module auxiliary inverter meets the power demand of the current whole machine output load capacity, including:

[0021] Obtaining a current remaining power capacity of the multi-module auxiliary inverter based on weighted scores corresponding to all DCDC submodules and all DCAC submodules;

[0022] If the current remaining power capacity is less than the preset power capacity, it is determined that the multi-module auxiliary inverter does not meet the power demand;

[0023] When the power requirement of the current whole machine output load capacity is met, the corresponding DCAC submodule and the DCDC submodule are controlled to work.

[0024] Further, in the above-mentioned multi-module auxiliary inverter, the weighted scores corresponding to all DCDC submodules are used as the first weighted scores, and the weighted scores corresponding to all DCAC submodules are used as the second weighted scores; the calculation formula of the current remaining power capacity is:

[0025] P res =min(a*Q DCDC , b*Q DCAC );

[0026] Among them, P res is the current remaining power capacity, a is the maximum output power of the DCDC submodule, b is the maximum output power of the DCAC submodule, Q DCDC For the first weighted score, Q DCAC is the second weighted score.

[0027] Further, in the above-mentioned multi-module auxiliary inverter, each of the DCDC submodules includes a first input terminal, a second input terminal, a first output terminal and a second output terminal, and each of the DCAC submodules includes a third input terminal, a fourth input terminal, a third output terminal, a fourth output terminal, a fifth output terminal and a sixth output terminal;

[0028] Each of the first input terminals is connected in parallel and configured to input a first power supply voltage, and each of the second input terminals is connected in parallel and configured to input a second power supply voltage;

[0029] The first output end of all DCDC submodules in each inverter module is connected in parallel to the third input end of the corresponding DCAC module, and the second output end is connected in parallel to the fourth input end of the corresponding DCAC module, wherein all DCDC submodules in the same inverter module correspond to the DCAC submodule in the inverter module;

[0030] Each of the third output terminals is connected in parallel to one end of the first output switch, each of the fourth output terminals is connected in parallel to one end of the second output switch, each of the fifth output terminals is connected in parallel to one end of the third output switch, each of the sixth output terminals is connected in parallel to the ground, and the other ends of the first output switch, the second output switch and the third output switch are used to respectively connect the three-phase lines of the external motor.

[0031] Furthermore, in the above-mentioned multi-module auxiliary inverter, it also includes:

[0032] The control module obtains the electrical signal data of each of the DCDC submodules and each of the DCAC submodules, and calculates the public trust data of each circuit node according to the electrical signal data; wherein each of the circuit nodes is composed of a plurality of the DCDC submodules and a plurality of the DCAC submodules;

[0033] Transmitting each of the public signal data to each of the DCDC submodules and each of the DCAC submodules; wherein the electrical signal data includes input voltage data and output voltage data;

[0034] The DCDC submodule and the DCAC submodule operate based on corresponding public trust data respectively.

[0035] Furthermore, in the above-mentioned multi-module auxiliary inverter, it also includes:

[0036] When the communication between the control module and the power module is lost, the power module enters an offline mode, and continues to work when the power module meets its own working conditions, wherein the power module includes the DCDC submodule and the DCAC submodule.

[0037] Furthermore, in the above-mentioned multi-module auxiliary inverter, when the DCAC submodule receives the abnormal adjustment signal sent by the control module, it adjusts the current output voltage and output frequency.

[0038] Another embodiment of the present application also proposes a power supply device, comprising at least n of the above-mentioned multi-module auxiliary inverters. When it is detected that m of the multi-module auxiliary inverters do not meet the power requirement, the m multi-module auxiliary inverters are stopped and the output power of the other (nm) multi-module auxiliary inverters is adjusted, where n is greater than m, and both n and m are positive integers.

[0039] The embodiments of the present application have the following beneficial effects:

[0040] The embodiment of the present application proposes a multi-module auxiliary inverter, which controls the stopping and working of the DCDC submodule and the DCAC submodule by adding an inverter module and a DCDC submodule, and by obtaining a first state value and a second state value in each inverter module, so as to reduce the impact caused by a small number of component abnormalities and submodule abnormalities, and improve the reliability and practicality of the entire system. BRIEF DESCRIPTION OF THE DRAWINGS

[0041] In order to more clearly illustrate the technical solution of the present application, the following is a brief introduction to the drawings required for use in the embodiments. It should be understood that the following drawings only illustrate certain embodiments of the present application and should not be regarded as limiting the scope of protection of the present application. In each of the drawings, similar components are numbered similarly.

[0042] Figure 1 A schematic diagram of a communication module of a multi-module auxiliary inverter according to some embodiments of the present application is shown;

[0043] Figure 2 A first flow chart showing a control method of a multi-module auxiliary inverter in some embodiments of the present application;

[0044] Figure 3 A second flow chart showing a control method of a multi-module auxiliary inverter in some embodiments of the present application;

[0045] Figure 4 A preset DCDC state table showing a control method of a multi-module auxiliary inverter in some embodiments of the present application;

[0046] Figure 5 A preset DCAC state table showing a control method of a multi-module auxiliary inverter in some embodiments of the present application;

[0047] Figure 6 A schematic diagram of the circuit structure of a multi-module auxiliary inverter according to some embodiments of the present application is shown. DETAILED DESCRIPTION

[0048] The technical solutions in the embodiments of the present application will be described clearly and completely below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all of the embodiments.

[0049] The components of the embodiments of the present application generally described and shown in the drawings herein may be arranged and designed in various configurations. Therefore, the following detailed description of the embodiments of the present application provided in the drawings is not intended to limit the scope of the application claimed for protection, but merely represents the selected embodiments of the present application. Based on the embodiments of the present application, all other embodiments obtained by those skilled in the art without making creative work belong to the scope of protection of the present application.

[0050] Hereinafter, the terms "including", "having" and their cognates, which may be used in various embodiments of the present application, are intended only to indicate specific features, numbers, steps, operations, elements, components, or combinations of the foregoing items, and should not be understood as first excluding the existence of one or more other features, numbers, steps, operations, elements, components, or combinations of the foregoing items or adding the possibility of one or more features, numbers, steps, operations, elements, components, or combinations of the foregoing items.

[0051] Furthermore, the terms “first”, “second”, “third”, etc. are merely used for distinguishing descriptions and are not to be understood as indicating or implying relative importance.

[0052] Unless otherwise defined, all terms (including technical terms and scientific terms) used herein have the same meanings as those generally understood by those skilled in the art to which the various embodiments of the present application belong. Terms (such as those defined in generally used dictionaries) will be interpreted as having the same meanings as the contextual meanings in the relevant technical field and will not be interpreted as having idealized meanings or overly formal meanings unless clearly defined in the various embodiments of the present application.

[0053] In conjunction with the accompanying drawings, some embodiments of the present application are described in detail below. In the absence of conflict, the following embodiments and features in the embodiments can be combined with each other.

[0054] Typically, when using a multi-module system, the probability of a small number of components failing increases, so a control solution is needed to reduce the impact of a small number of component failures.

[0055] Therefore, in order to solve the above problems, the present application proposes a new multi-module auxiliary inverter and a corresponding control scheme.

[0056] Please refer to Figure 1 , is a schematic diagram of a communication module of a multi-module auxiliary inverter proposed in an embodiment of the present application. Exemplarily, the multi-module auxiliary inverter is applied to a power supply device and a vehicle, for example, the vehicle may be a car, a ship, a train with multiple carriages, etc.

[0057] In some embodiments, Figure 1 As shown, a multi-module auxiliary inverter includes a control module 100 and a plurality of parallel inverter modules 200, each inverter module 200 includes a plurality of DCDC submodules 210 and a DCAC submodule 220. The control module 100, the DCDC submodule 210 and the DCAC submodule 220 are all connected to the Can communication bus.

[0058] Specifically, the control module 100 obtains the first state value of each DCDC submodule 210 and the second state value of each DCAC submodule 220 through the Can communication bus. Then, according to the first state value and the second state value, each DCDC submodule 210 and each DCAC submodule 220 are controlled to stop and work respectively. Among them, the number of inverter modules 200 in the multi-module auxiliary inverter can be any number, such as 2 to 50. The number of multi-module auxiliary inverters in this application is selected to be 2 to 6, which is not limited here. In addition, the number of DCDC submodules 210 in each inverter module 200 can be 2 to 10, preferably, the number is 2, which is not limited here.

[0059] The first state value and the second state value may use different values ​​or characters to represent the working states of the DCDC submodule 210 and the DCAC submodule 220 , respectively.

[0060] Exemplarily, the first state value may be 0, 1, 2, A or B, etc., and the second state value may be 0, 1, 2, A or B, etc. The first state value and the second state value may use the same or different numbers and characters to represent their working states.

[0061] In addition, optionally, if the current multi-module auxiliary inverter selects x groups of DCDC sub-modules 210 and y groups of DCAC sub-modules 220, y inverter modules 200 can be formed, and the module power ratio of the DCDC sub-module 210 and the DCAC sub-module 220 in each inverter module 200 is x / y.

[0062] In some embodiments of the multi-module auxiliary inverter, such as Figure 2 As shown, based on the first state value and the second state value, each DCDC submodule 210 and each DCAC submodule 220 are controlled to stop and work respectively, including:

[0063] S110 , based on the first state value and the second state value, respectively obtain the working state of each DCDC submodule 210 and the working state of each DCAC submodule 220 , where the working state includes an abnormal state and a normal state.

[0064] Exemplarily, if the DCDC submodule 210 works normally, the corresponding first state value is 1, and if it is abnormal, the corresponding first state value is 0. If the DCAC submodule 220 works normally, the corresponding second state value is A, and if it is abnormal, the corresponding second state value is B. Preferably, the first state value and the second state value both use 0 and 1 in binary to represent abnormality and normality, respectively, that is, the value ranges of the first state value and the second state value are both {0, 1}.

[0065] S210 , when the working state of a certain DCDC submodule 210 is abnormal, the inverter module 200 corresponding to the DCDC submodule 210 is controlled to stop working, and DCDC module abnormality information is generated.

[0066] S310 , transmitting the DCDC module abnormality information to the DCAC submodule 220 in the inverter module 200 to instruct the DCAC submodule 220 to adjust the output power.

[0067] Specifically, when the control module 100 detects that the working state of a certain DCDC submodule 210 is abnormal, a stop instruction of the inverter module 200 corresponding to the DCDC submodule 210 will be generated. This is because when a single DCDC submodule 210 is abnormal, the total power of the DCDC submodule 210 is reduced, and the corresponding DCAC submodule 220 will not be able to respond in time, which will cause the normal DCDC submodule 210 to be overloaded. Therefore, it is necessary to control the inverter module 200 to stop working. Among them, the abnormal information of the DCDC submodule 210 refers to the abnormal information of the DCDC submodule 210 that has an abnormality. It should be noted that only the DCDC submodule 210 and the DCAC submodule 220 in the same inverter module 200 correspond.

[0068] The advantage of this embodiment is that when the DCAC submodule 220 output parallel characteristic curve changes, it still maintains stable parallel operation; at the same time, it ensures that the remaining normal DCDC submodules 210 in the same inverter module 200 have the same output load state as the DCDC submodules 210 of other inverter modules 200, and exerts the maximum load capacity of the whole machine. That is, it emphasizes the control algorithm such as power adjustment through abnormal analysis, so that all the remaining DCDC submodules 210 can still exert the maximum load performance. On the contrary, if power adjustment is not performed, the remaining normal DCDC submodules 210 in the inverter module 200 will cause overcurrent and all failures when the load is large, causing the inverter module 200 to be completely unable to work.

[0069] For example, if there are existing inverter modules 200A, 200B and 200C, and if the inverter module 200A contains DCDC submodules 2101, 2102 and 2201, and each DCDC submodule 210 has a maximum output power of 40KW, and the DCAC submodule 2201 needs to output 80KW of power, then the DCDC submodules 2101 and 2102 both output 40KW of power. If the DCDC submodule 2101 fails, the entire inverter module 200A will stop working (the DCDC submodules 2101, 2102 and 2201 will all stop working). Then the abnormal information of the DCDC submodule 2101 is sent to the DCAC submodule 2201. When the DCAC submodule 2201 receives it, it makes adaptive adjustments after corresponding calculations and then reduces the output power to a maximum of no more than 50KW, instead of giving all the 80KW power that needs to be output to the DCDC submodule 2102.

[0070] S410 , when the adjustment completion information sent by the DCAC sub-module 220 is received, the DCDC sub-module 210 and the DCAC sub-module 220 in the inverter module 200 in the normal state are controlled to work.

[0071] Specifically, when the DCAC sub-module 220 is adjusted, it generates adjustment completion information. When the control module 100 receives the adjustment completion information, it generates a startup instruction corresponding to the inverter module 200 and transmits it to the DCAC sub-module 220 and the DCDC sub-module 210. When the DCAC sub-module 220 and the DCDC sub-module 210 receive the startup instruction, they start working.

[0072] It should be noted that the DCDC submodule 210 that is restarted is a DCDC submodule 210 in a normal working state. And the control module 100 pre-stores a number table, which includes the numbers of each inverter module 200 and the numbers of the DCDC submodule 210 and the DCAC submodule 220 in each inverter module 200, as well as the correspondence between the numbers of each DCDC submodule 210, the DCAC submodule 220 and the inverter module 200. Each information transmitted through the Can data bus carries a corresponding number, which is used for identification and control of each module.

[0073] Exemplarily, the inverter module 200 discovers that the DCDC sub-module 2101 has a fault. When the completed adjustment information of the DCAC sub-module 2201 is received, the DCAC sub-module 220 number in the completed adjustment information is extracted, and the number of the DCDC sub-module 210 in the normal state corresponding to the number is found, and the start-up instructions of the DCDC sub-module 2102 and the DCAC sub-module 2201 are generated.

[0074] S510, when the working state of a certain DCAC submodule 220 is abnormal, the inverter module 200 corresponding to the DCAC submodule 220 is controlled to stop working.

[0075] Specifically, when a single DCAC submodule 220 is abnormal, the control module 100 generates a stop instruction for all submodules (including all DCDC submodules 210 and DCAC submodules 220) in the corresponding inverter module 200. Because there is only one DCAC submodule 220 in an inverter module 200, when the DCAC submodule 220 is abnormal, all corresponding DCDC submodules 210 no longer need to work.

[0076] In the multi-module auxiliary inverter of some embodiments, when the DCAC sub-module 210 receives the abnormal adjustment signal sent by the control module 100, it adjusts the current output voltage and output frequency.

[0077] Specifically, when an abnormality occurs in a certain DCDC submodule 210, the control module 100 will detect the corresponding abnormality and generate an abnormal adjustment signal to the corresponding DCAC submodule 220. When the corresponding DCAC submodule 220 receives the abnormal adjustment information, it will adjust the current output voltage and output frequency according to the current acquisition.

[0078] Optionally, the current output voltage regulation formula is:

[0079] ;

[0080] Wherein, u is the current output voltage of the DCAC submodule 220, is the initial voltage of the DCAC submodule 220 (the output voltage under no-load), m is the preset voltage droop coefficient, k is the preset droop coefficient adjustment parameter, a is the number of DCDC submodules 210 currently working normally, A is the number of DCAC submodules 220 currently working normally, and Q is the reactive power output by the DCAC submodule 220 in real time.

[0081] Optionally, the current output frequency adjustment formula is:

[0082] ;

[0083] Wherein, f is the current output frequency of the DCAC submodule 220, is the initial frequency of the DCAC submodule 220 (the output frequency under no-load), m is the preset frequency droop coefficient, k is the preset droop coefficient adjustment parameter, a is the number of DCDC submodules 210 currently operating normally, A is the number of DCAC submodules 220 currently operating normally, and P is the active power output by the DCAC submodule 220 in real time.

[0084] Specifically, compared with the existing algorithm, the above adjustment formula adds matching compensation for the state of the DCDC submodule 210 in the front stage of the current DCAC submodule 220. When a single or multiple modules fail (not all fail) in the DCDC submodule 210 in the front stage of the DCAC submodule 220, if the DCAC submodule 220 still follows the original design droop parameters, the DCAC submodule 220 will be controlled according to the original design droop parameters, and try to share power with other DCAC submodules 220. Output, at this time, it will cause the front-stage DCDC part of a single power unit to be unable to support the full power of the DCAC due to some DCDC submodules 210, causing the remaining DCDC submodules 210 to be overloaded and even damaged. Therefore, it is necessary to adjust to ensure that the maximum power is output safely and reliably under the premise of normal operation of the module, and to minimize the impact of a few module abnormalities on the entire machine.

[0085] In some embodiments, Figure 3 As shown, the multi-module auxiliary inverter also includes:

[0086] S610 , based on the first state value and the second state value, compare the preset state table to obtain weighted scores corresponding to all DCDC submodules 210 and all DCAC submodules 220 .

[0087] Specifically, all DCDC submodules 210 correspond to a weighted score, and all DCAC submodules 220 correspond to a weighted score, and the weighted score is related to the working state of the submodule.

[0088] In some embodiments of the multi-module auxiliary inverter, the preset state table includes a preset DCDC state table and a preset DCAC state table; based on the weighted scores corresponding to all DCDC submodules 210 and all DCAC submodules 220, the weighted scores corresponding to all DCDC submodules 210 and all DCAC submodules 220 are obtained by comparing the preset state table, including:

[0089] Based on each first state value, the first weighted scores corresponding to all DCDC sub-modules 210 are obtained by comparing with the preset DCDC state table.

[0090] Specifically, the number of normal operations of the DCDC submodule 210 is linearly related to the first weighted score. Specifically, the ratio of the weighted score to the number of normal operations is a fixed value, which can be set arbitrarily and is not limited here.

[0091] Exemplarily, if the multi-module auxiliary inverter includes 8 DCDC sub-modules 210, if the constant value is set to 1, and the value range of the first state value is {0, 1}, if Figure 4 As shown, the weighted scores of each DCDC submodule 210 in different working states are different. For example, when DCDC1 to DCDC8 are all working normally, the corresponding weighted score is 8. Figure 4 Only part of the data in the preset DCDC state table is shown.

[0092] Based on each second state value, the second weighted scores corresponding to all DCAC submodules 220 are obtained by comparing with the preset DCAC state table.

[0093] Specifically, the number of normal operations of the DCAC submodule 220 is linearly related to the second weighted score. Specifically, the ratio of the weighted score to the number of normal operations is a constant value, which can be set arbitrarily and is not limited here.

[0094] Exemplarily, if the multi-module auxiliary inverter includes four DCAC submodules 220, if the constant is set to 1, and the value range of the first state value is {0, 1}, then Figure 5 As shown, the weighted score of each DCAC submodule 220 in different working states is different. For example, when DCAC1 and DCAC3 are working normally, and DCAC2 and DCAC4 are abnormal (not shown in the table), the corresponding weighted score is 2. Figure 5 Only part of the data in the preset DCAC status table is shown.

[0095] S710 , based on the weighted scores corresponding to all DCDC submodules 210 and all DCAC submodules 220 , determine whether the multi-module auxiliary inverter meets the power requirement of the current output load capacity of the entire machine.

[0096] In some embodiments of the multi-module auxiliary inverter, based on the weighted scores corresponding to all DCDC sub-modules 210 and all DCAC sub-modules 220, it is determined whether the multi-module auxiliary inverter meets the power demand of the current whole machine output load capacity, including:

[0097] Based on the weighted scores corresponding to all DCDC sub-modules 210 and all DCAC sub-modules 220 , the current remaining power capacity of the multi-module auxiliary inverter is obtained.

[0098] In some embodiments of the multi-module auxiliary inverter, the weighted scores corresponding to all DCDC submodules 210 are used as the first weighted scores, and the weighted scores corresponding to all DCAC submodules 220 are used as the second weighted scores; the calculation formula for the current remaining power capacity is:

[0099] P res =min(a*Q DCDC , b*Q DCAC );

[0100] Among them, P res is the current remaining power capacity, a is the maximum output power of the DCDC submodule 210, b is the maximum output power of the DCAC submodule 220, Q DCDC is the first weighted score, Q DCAC is the second weighted score.

[0101] For example, if the maximum output power of the DCDC submodule 210 is 30KW and the maximum output power of the DCAC submodule 220 is 60KW, Q DCDC 5, Q DCAC is 3, then P res It is 150KW.

[0102] If the current remaining power capacity is less than the preset power capacity, it is determined that the multi-module auxiliary inverter does not meet the power demand.

[0103] Specifically, the preset power capacity is determined by the power required by the external motor connected to the multi-module auxiliary inverter. The preset power capacity is different in different application scenarios and is not limited here.

[0104] For example, if the preset power capacity is 180KW, and the current remaining power capacity P res If the power consumption is 150KW, the multi-module auxiliary inverter cannot meet the power demand.

[0105] S810, when the power requirement of the current whole machine output load capacity is met, the corresponding DCAC submodule 220 and DCDC submodule 210 are controlled to operate.

[0106] Specifically, only when the current output load capacity of the whole machine meets the current power demand, the multi-module auxiliary inverter will control the corresponding DCAC submodule 220 and DCDC submodule 210 to work. The multi-module auxiliary inverter meets the power demand of the output load capacity of the whole machine, which means that the multi-module auxiliary inverter can make the power output of the whole machine meet the required power of the load currently carried by the whole machine.

[0107] In some embodiments of the multi-module auxiliary inverter, such as Figure 6As shown, each DCDC submodule 210 includes a first input terminal a1, a second input terminal a2, a first output terminal b1, and a second output terminal b2, and each DCAC submodule 220 includes a third input terminal a3, a fourth input terminal a4, a third output terminal b3, a fourth output terminal b4, a fifth output terminal b5, and a sixth output terminal b6. Each first input terminal a1 is connected in parallel and configured to input a first power supply voltage 410, and each second input terminal a2 is connected in parallel and configured to input a second power supply voltage 420. The first output terminal b1 of all DCDC submodules 210 in each inverter module 200 is connected in parallel to the third input terminal a3 of the corresponding DCAC module, and the second output terminal b2 is connected in parallel to the fourth input terminal a4 of the corresponding DCAC module, wherein all DCDC submodules 210 in the same inverter module 200 correspond to the DCAC submodule 220 in the inverter module 200. Each third output terminal b3 is connected in parallel to one end of the first output switch 310, each fourth output terminal b4 is connected in parallel to one end of the second output switch 320, each fifth output terminal b5 is connected in parallel to one end of the third output switch 330, each sixth output terminal b6 is connected in parallel to the ground, and the other ends of the first output switch 310, the second output switch 320 and the third output switch 330 are used to respectively connect the three-phase lines of the external motor 500.

[0108] Specifically, Figure 1 different, Figure 1 The module structure of the communication transmission between modules is shown, and this embodiment mainly illustrates the electrical connection between each module (i.e., the circuit structure diagram). This embodiment adopts a three-phase four-wire system, and the voltage output by the DCAC submodule 220 is used to control the access voltage of the three-phase line of the external motor respectively. And the voltage output to the three-phase line of the external motor can also be adjusted by the duty cycle of the first output switch 310 to the third output switch 330 to control the rotation speed of the external motor.

[0109] Exemplarily, the first power supply voltage 410 is +1500V, the second power supply voltage 420 is -1500V, and after being stepped down by the DCDC submodule 210, the two output voltages are +600V and -600V, respectively. Of course, this is just an example, and the magnitude of the first power supply voltage 410 and the second power supply voltage 420, as well as the degree of voltage regulation by the DCDC submodule 210 and the DCAC submodule 220 depend on specific application scenarios and situations, and are not limited here.

[0110] In some embodiments, the multi-module auxiliary inverter further comprises:

[0111] The control module 100 obtains the electrical signal data of each DCDC submodule 210 and each DCAC submodule 220, and calculates the public trust data of each circuit node according to the electrical signal data. Each circuit node is composed of a plurality of DCDC submodules 210 and a plurality of DCAC submodules 220. The electrical signal data includes input voltage data and output voltage data.

[0112] Specifically, the control module 100 obtains the electrical signal data of each DCDC submodule 210 and each DCAC submodule 220 through the Can communication bus. Since each DCDC submodule 210 and each DCAC submodule 220 corresponds to a circuit node, that is, each electrical signal data corresponds to a node parameter, the control module 100 can filter out each electrical signal data corresponding to each same circuit node based on all the acquired electrical signal data, and then calculate the public trust data of each circuit node. Among them, the electrical signal data includes but is not limited to the output DC voltage data and input DC voltage data of the DCDC submodule 210, and the output AC voltage data of the DCAC submodule 220.

[0113] For example, refer to Figure 6 As shown, the circuit can obtain the input DC voltage data of one DCDC submodule 210, the intermediate voltage data (i.e., the input DC voltage data of the DCAC submodule 220) of the same number as the inverter module 200, and the output AC voltage data of the DCAC submodule 220 of the same number as the inverter module 200. Moreover, similar public current data can also be formed based on the current loop.

[0114] Optionally, a voltage sensor is provided between the first input terminal and the second input terminal of each DCDC submodule 210 to obtain the input DC voltage of the DCDC submodule 210. Similarly, a voltage sensor may be provided at the input and output terminals of other submodules to obtain corresponding electrical signal data.

[0115] Each public trust data is transmitted to each DCDC sub-module 210 and each DCAC sub-module 220 .

[0116] The DCDC submodule 210 and the DCAC submodule 220 operate based on corresponding public trust data, respectively.

[0117] Specifically, the control module 100 transmits the public trust data of each circuit node to each submodule, and each submodule decides whether to use its own current electrical signal data or public trust data according to its corresponding public trust data to maintain continuous operation. In this way, even if the voltage sensor of a circuit node of a submodule fails and cannot obtain the corresponding electrical signal data, it can still use the public trust data to continue working.

[0118] Optionally, the control module 100 calculates the credibility data by an algorithm as follows: the control module 100 obtains all electrical signal data corresponding to each circuit node, and selects the second largest electrical signal data from all electrical signal data corresponding to the same circuit node as the credibility data of the circuit node. Alternatively, the maximum electrical signal data and the minimum electrical signal data of all electrical signal data corresponding to the same circuit node are removed, and the remaining electrical signal data are averaged, and the average value is used as the credibility data of the circuit node. Of course, other methods can also be used to calculate the credibility data, which is not limited here.

[0119] Optionally, the submodule works based on the corresponding public credibility data, including: comparing the public credibility data with the current electrical signal data of the submodule, and if the deviation between the current electrical signal data of the submodule and the public credibility data is greater than the preset deviation ratio value, the public credibility data is used to work to prevent the voltage sensor from failing and maintain the work. If the deviation between the current electrical signal data of the submodule and the public credibility data is not greater than the preset deviation ratio value, the current electrical signal data of the submodule is used to work to obtain the best real-time performance. Optionally, the preset deviation ratio value can range from 10% to 30%, and of course it can also be other values, which are not limited here.

[0120] In addition, the embodiments of the present application also propose several strategies to ensure the maximum power output of the system in response to component abnormalities, so as to reduce the impact of non-executing component damage and unnecessary actions on the entire system. It is mainly divided into the following points:

[0121] General sensor exception handling strategy. Since there are a large number of power modules in the entire auxiliary inverter system, and various sensors are configured inside each module, there are a large number of repeated sampling at the same point in the entire system. This also provides a data source for sensor exception handling. Therefore, it is proposed to intelligently integrate and process the sampling data at the same position in the entire system in the monitoring module, and output relatively accurate data for each module to judge its own sensor status. If the difference is within an acceptable range, the sensor data inside the module is used to perform operations including digital loop adjustment and fault detection. When the difference exceeds the acceptable value, the power module uses the integrated data sent by the monitoring module instead of the original data, and only prompts an alarm to the outside to maintain the normal output capacity of the module.

[0122] Based on the above basic structure, measures are taken, such as maintaining module operation control when communication is lost, and using network public trust data when sensor devices fail, so that each submodule can still keep running as much as possible when non-executing devices are abnormal. Then, based on all the submodules that can be operated, accurate quantitative calculations such as weighting are performed to obtain the maximum load capacity that can be exerted, and then compared with the actual needs of the whole machine to determine whether to continue running. Then, when the maximum load capacity meets the actual needs of the whole machine, that is, the multi-module auxiliary inverter meets the power demand of the current output load capacity of the whole machine, the monitoring module calculates and controls the output power of the DCAC submodule and adjusts the parameters of the parallel algorithm according to the abnormal state. To ensure that each module can play its role to the maximum extent and achieve the actual effect. In summary, higher availability or functional reliability is obtained, and the redundancy effect is greatly improved.

[0123] Communication component abnormality strategy. For power supply systems with separate logic and power conversion control, the start and shutdown of the power module are controlled by the monitoring module, and the control method is mainly various communication control. In general, when the communication between the control module 100 and the power module (such as the DCAC submodule 220 and the DCDC submodule 210) is lost, the power module will not be able to start normally. In order to ensure the maximum output capacity of the entire system, it is necessary to make a comprehensive judgment on this site. When the power module detects that the communication with the monitoring module is lost, it automatically enters the offline mode and automatically keeps working when its own working conditions are met. Since the front-stage input and the rear-stage output of the power module are both controlled by the monitoring module, the power module will not directly face the external power supply and load, so there is no possibility of unpredictable impact on the outside. In addition, the offline mode / stand-alone mode can be safely coordinated. The mechanism is that for offline, the DCAC submodule 220 is designed with an offline parallel timing, that is, the corresponding power-on parallel delay is preset according to the module ID address. Compared with the communication phase, the parallel working timing is basically the same, which ensures the risk of competition for AC parallel when it is not controlled by communication. (When the communication is normal, the input of the DCAC submodule 220 is controlled in coordination with the communication instructions of the monitoring module).

[0124] The embodiment of the present application proposes a multi-module auxiliary inverter, which controls the stopping and working of the DCDC submodule 210 and the DCAC submodule 220 by adding an inverter module 200 and a DCDC submodule 210, and by obtaining a first state value and a second state value in each inverter module 200, so as to reduce the impact caused by abnormalities of a small number of components and improve the reliability and practicality of the entire system.

[0125] Specifically, this application makes a quantitative judgment on the state of the whole machine, and judges whether the current multi-module auxiliary inverter can meet the working conditions according to the actual on-site working conditions and load utilization rate, so as to minimize the impact of module abnormalities on the whole machine (whole vehicle). At the same time, when processing module abnormalities, it can effectively ensure safe exit when the module is abnormal, and avoid avalanche phenomenon caused by a single module abnormality, resulting in multiple modules being abnormal or even damaged. Regarding component abnormalities, the above strategy can greatly reduce the impact of a small number of component abnormalities on the whole machine, and avoid the whole system being affected by the increase in modular design modules and components. Reliability and practicality of the system.

[0126] Another embodiment of the present application also proposes a power supply device, comprising at least n of the above-mentioned multi-module auxiliary inverters. When it is detected that m multi-module auxiliary inverters do not meet the power requirement, the m multi-module auxiliary inverters are stopped and the output power of the other (nm) multi-module auxiliary inverters is adjusted, where n is greater than m, and n and m are both positive integers.

[0127] Specifically, in order to prevent problems caused by the multi-module auxiliary inverter not meeting the power demand, it is necessary to set up multiple multi-module auxiliary inverters, which can not only split the power flow and cooperate with each other, but also when one of them is abnormal, the power supply device can still use other normal multi-module auxiliary inverters to work normally. Among them, n depends on the specific application scenario and is not limited here. In this embodiment, the value range of n can be set to 2~5.

[0128] Another embodiment of the present application further provides a vehicle, comprising the above-mentioned multi-module auxiliary inverter or the above-mentioned power supply device.

[0129] Specifically, the vehicles of the present application include but are not limited to automobiles, multi-carriage vehicles (amusement park vehicles, subways, trains, etc.). In addition to the vehicles mentioned in this embodiment, the above-mentioned multi-module auxiliary inverter or motor can also be other means of transportation, such as ships, airplanes, rockets, etc., which are not limited here.

[0130] It can be understood that the multi-module auxiliary inverter in the vehicle of this embodiment corresponds to the multi-module auxiliary inverter in the above embodiment, wherein the options of the above multi-module auxiliary inverter are also applicable to this embodiment and will not be repeated here.

[0131] In several embodiments provided in the present application, it should be understood that the disclosed apparatus and method can also be implemented in other ways. The apparatus embodiments described above are merely schematic, for example, the flowcharts and structure diagrams in the accompanying drawings show the possible architecture, functions and operations of the apparatus, method and computer program product according to multiple embodiments of the present application. In this regard, each box in the flowchart or block diagram can represent a module, a program segment or a part of a code, and a module, a program segment or a part of a code contains one or more executable instructions for implementing a specified logical function. It should also be noted that in an alternative implementation, the functions marked in the box can also occur in a different order from that marked in the accompanying drawings. For example, two consecutive boxes can actually be executed substantially in parallel, and they can sometimes be executed in the opposite order, depending on the functions involved. It should also be noted that each box in the structure diagram and / or the flow diagram, and the combination of boxes in the structure diagram and / or the flow diagram, can be implemented with a dedicated hardware-based system that performs a specified function or action, or can be implemented with a combination of dedicated hardware and computer instructions.

[0132] In addition, the functional modules or units in the various embodiments of the present application may be integrated together to form an independent part, or each module may exist separately, or two or more modules may be integrated to form an independent part.

[0133] If the function is implemented in the form of a software function module and sold or used as an independent product, it can be stored in a computer-readable storage medium. Based on this understanding, the technical solution of the present application can be essentially or partly embodied in the form of a software product that contributes to the prior art. The computer software product is stored in a storage medium, including several instructions to enable a computer device (which can be a smart phone, a personal computer, a server, or a network device, etc.) to execute all or part of the steps of the method described in each embodiment of the present application. The aforementioned storage medium includes: U disk, mobile hard disk, read-only memory (ROM, Read-Only Memory), random access memory (RAM, Random Access Memory), disk or optical disk, etc., which can store program code.

[0134] The above description is only a specific implementation manner of the present application, but the protection scope of the present application is not limited thereto. Any technician familiar with the technical field can easily think of changes or substitutions within the technical scope disclosed in the present application, which should be included in the protection scope of the present application.

Claims

1. A multi-module auxiliary inverter, characterized in that: It includes a control module and a plurality of parallel inverter modules, each of which includes a plurality of DCDC submodules and a DCAC submodule; The control module, the DCDC submodule and the DCAC submodule are all connected to a Can communication bus; The control module obtains a first state value of each of the DCDC submodules and a second state value of each of the DCAC submodules through the Can communication bus; Based on the first state value and the second state value, respectively controlling the stopping and working of each of the DCDC submodules and each of the DCAC submodules; The method of controlling the stopping and working of each of the DCDC submodules and each of the DCAC submodules based on the first state value and the second state value includes: Based on the first state value and the second state value, respectively obtain the working state of each of the DCDC submodules and the working state of each of the DCAC submodules, wherein the working state includes an abnormal state and a normal state; When the working state of a certain DCDC submodule is abnormal, the inverter module corresponding to the DCDC submodule is controlled to stop working, and DCDC module abnormality information is generated; Transmitting the abnormal information of the DCDC module to the DCAC submodule in the inverter module to instruct the DCAC submodule to adjust the output power; When the adjustment completion information sent by the DCAC submodule is received, the DCDC submodule and the DCAC submodule in the inverter module in normal state are controlled to work.

2. The multi-module auxiliary inverter according to claim 1, characterized in that: include: When the working state of a certain DCAC submodule is abnormal, the inverter module corresponding to the DCAC submodule is controlled to stop working.

3. The multi-module auxiliary inverter according to any one of claims 1 to 2, characterized in that: Also includes: Based on the first state value and the second state value, compare the preset state table to obtain weighted scores corresponding to all DCDC submodules and all DCAC submodules respectively; Based on the weighted scores corresponding to all DCDC submodules and all DCAC submodules, judging whether the multi-module auxiliary inverter meets the power demand of the current whole machine output load capacity; When the power requirement of the current whole machine output load capacity is met, the corresponding DCAC submodule and the DCDC submodule are controlled to work.

4. The multi-module auxiliary inverter according to claim 3, characterized in that: The preset state table includes a preset DCDC state table and a preset DCAC state table; the weighted scores corresponding to all DCDC submodules and all DCAC submodules are obtained by comparing the preset state table with the weighted scores corresponding to all DCDC submodules and all DCAC submodules, respectively, including: Based on each of the first state values, compare the preset DCDC state table to obtain first weighted scores corresponding to all DCDC sub-modules; Based on each of the second state values, the second weighted scores corresponding to all DCAC sub-modules are obtained by comparing with the preset DCAC state table.

5. The multi-module auxiliary inverter according to claim 3, characterized in that: Based on the weighted scores corresponding to all DCDC submodules and all DCAC submodules, judging whether the multi-module auxiliary inverter meets the power demand of the current whole machine output load capacity includes: Obtaining a current remaining power capacity of the multi-module auxiliary inverter based on weighted scores corresponding to all DCDC submodules and all DCAC submodules; If the current remaining power capacity is less than the preset power capacity, it is determined that the multi-module auxiliary inverter does not meet the power demand.

6. The multi-module auxiliary inverter according to claim 5, characterized in that: The weighted scores corresponding to all DCDC submodules are used as the first weighted scores, and the weighted scores corresponding to all DCAC submodules are used as the second weighted scores; the calculation formula for the current remaining power capacity is: P res =min(a*Q DCDC ,b*Q DCAC ); Among them, P res is the current remaining power capacity, a is the maximum output power of the DCDC submodule, b is the maximum output power of the DCAC submodule, Q DCDC For the first weighted score, Q DCAC is the second weighted score.

7. The multi-module auxiliary inverter according to any one of claims 1 to 2 and 4 to 6, characterized in that: Each of the DCDC submodules includes a first input terminal, a second input terminal, a first output terminal, and a second output terminal, and each of the DCAC submodules includes a third input terminal, a fourth input terminal, a third output terminal, a fourth output terminal, a fifth output terminal, and a sixth output terminal; Each of the first input terminals is connected in parallel and configured to input a first power supply voltage, and each of the second input terminals is connected in parallel and configured to input a second power supply voltage; The first output end of all DCDC submodules in each inverter module is connected in parallel to the third input end of the corresponding DCAC module, and the second output end is connected in parallel to the fourth input end of the corresponding DCAC module, wherein all DCDC submodules in the same inverter module correspond to the DCAC submodule in the inverter module; Each of the third output terminals is connected in parallel to one end of the first output switch, each of the fourth output terminals is connected in parallel to one end of the second output switch, each of the fifth output terminals is connected in parallel to one end of the third output switch, each of the sixth output terminals is connected in parallel to the ground, and the other ends of the first output switch, the second output switch and the third output switch are used to respectively connect the three-phase lines of the external motor.

8. The multi-module auxiliary inverter according to claim 7, characterized in that: Also includes: The control module obtains the electrical signal data of each of the DCDC submodules and each of the DCAC submodules, and calculates the public trust data of each circuit node according to the electrical signal data; wherein each of the circuit nodes is composed of a plurality of the DCDC submodules and a plurality of the DCAC submodules; Transmitting each of the public signal data to each of the DCDC submodules and each of the DCAC submodules; wherein the electrical signal data includes input voltage data and output voltage data; The DCDC submodule and the DCAC submodule operate based on corresponding public trust data respectively.

9. The multi-module auxiliary inverter according to claim 1, characterized in that: Also includes: When the communication between the control module and the power module is lost, the power module enters an offline mode, and continues to work when the power module meets its own working conditions, wherein the power module includes the DCDC submodule and the DCAC submodule.

10. The multi-module auxiliary inverter according to claim 1, characterized in that: When the DCAC submodule receives the abnormal adjustment signal sent by the control module, it adjusts the current output voltage and output frequency.

11. A power supply device, characterized in that: The invention comprises at least n multi-module auxiliary inverters as described in any one of claims 1 to 9. When it is detected that m multi-module auxiliary inverters do not meet the power demand, the m multi-module auxiliary inverters are stopped and the output power of other (nm) multi-module auxiliary inverters is adjusted, wherein n is greater than m, and both n and m are positive integers.

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