Auxiliary power supply module verification method and device

Abstract

This application provides a method and apparatus for verifying auxiliary power supply modules. The method includes: performing no-load, half-load, and full-load tests on a medium-frequency power supply module individually connected to a simulated medium-voltage bus under rated input voltage, maximum input voltage, and minimum input voltage, obtaining multiple sets of first test results; connecting multiple medium-frequency power supply modules in parallel to the medium-voltage bus, and performing no-load, half-load, and full-load tests on each medium-frequency power supply module under rated input voltage, maximum input voltage, and minimum input voltage, obtaining multiple sets of second test results for each power supply module; if the first test results meet the first test requirements, the second test results meet the second test requirements, and the second reactive power and second active power corresponding to different medium-frequency power supply modules are the same, it is determined that multiple medium-frequency power supply modules are suitable for grid-connected power supply. This application enables auxiliary power supply modules produced by different manufacturers to be mixed for grid-connected power supply.

Description

Technical Field

[0001] This application relates to the field of power supply technology, and in particular to a method and apparatus for verifying auxiliary power supply modules. Background Technology

[0002] Train sets are typically equipped with multiple medium-frequency auxiliary power supply modules to supply power to the medium-voltage loads of the train set.

[0003] A common medium-voltage power supply mode used in train sets is grid-connected power supply. Grid-connected power supply means that the medium-voltage bus runs through the entire train set, and all medium-frequency auxiliary power supply modules simultaneously output power to the medium-voltage bus, while all loads in all train sets that require medium-voltage power are directly powered through the medium-voltage bus.

[0004] Currently, in grid-connected power supply mode, to ensure reliable power supply and reduce the possibility of short circuits or faults on the medium-voltage bus due to differences in the output AC power of the intermediate frequency auxiliary power supply modules, the intermediate frequency auxiliary power supply modules connected to the medium-voltage system are generally products from the same manufacturer and of the same model. However, due to various reasons such as the demands of the transportation industry and train production, the need for mixed grid-connected power supply of intermediate frequency auxiliary power supply modules from different suppliers is increasing. Therefore, how to enable mixed grid-connected power supply of intermediate frequency auxiliary power supply modules from different manufacturers is a technical problem that needs to be solved by those skilled in the art. Summary of the Invention

[0005] This application provides an auxiliary power supply module verification method and apparatus, so that auxiliary power supply modules from different manufacturers can be mixed for grid-connected power supply.

[0006] On the one hand, this application provides an auxiliary power supply module verification method, including:

[0007] A plurality of intermediate frequency auxiliary power supply modules are determined to be used for grid-connected power supply, wherein the rated capacity and the rated values ​​of a plurality of specified output indicators of the plurality of intermediate frequency auxiliary power supply modules are the same;

[0008] For each intermediate frequency auxiliary power supply module, the intermediate frequency auxiliary power supply module is connected to a simulated medium-voltage bus. Based on the rated capacity, and with the input voltage of the intermediate frequency auxiliary power supply module controlled at the set rated input voltage, the highest input voltage, and the lowest input voltage, no-load, half-load, and full-load tests are performed on the intermediate frequency auxiliary power supply module to obtain multiple sets of first test results corresponding to the intermediate frequency auxiliary power supply module. The first test results include: first active power, first reactive power, first apparent power, and the first test values ​​of each of the multiple specified output indicators.

[0009] The multiple intermediate frequency auxiliary power supply modules are connected in parallel to a simulated medium-voltage bus. Based on the rated capacity, and with the input voltage of each intermediate frequency auxiliary power supply module controlled at the set rated input voltage, maximum input voltage, and minimum input voltage, no-load, half-load, and full-load tests are performed on each intermediate frequency auxiliary power supply module to obtain multiple sets of second test results for each intermediate frequency auxiliary power supply module. The second test results include: second active power, second reactive power, second apparent power, and second test values ​​of the multiple specified output indicators.

[0010] If the first test result meets the first test requirement, the second test result meets the second test requirement, and the second reactive power and second active power corresponding to different intermediate frequency auxiliary power supply modules are the same, then it is determined that the plurality of intermediate frequency auxiliary power supply modules are suitable for grid-connected power supply.

[0011] Preferably, the plurality of specified output parameters include: output voltage and output frequency.

[0012] Preferably, the first test result satisfies the first test requirement, including:

[0013] Based on the first control line between reactive power and reference output voltage, the reference output voltage corresponding to the first reactive power in the first test result is determined as the first test value of the output voltage in the first test result;

[0014] Based on the second control line between active power and reference output frequency, the reference output frequency corresponding to the first active power in the first test result is determined as the first test value of the output frequency in the first test result;

[0015] The second test result meets the second test requirements, including:

[0016] Based on the first control line, the reference output voltage corresponding to the second reactive power in the second test result is determined as the second test value of the output voltage in the second test result;

[0017] Based on the second control line, the reference output frequency corresponding to the second active power in the second test result is determined as the second test value of the output frequency in the second test result.

[0018] Preferably, the plurality of specified output metrics further include: total harmonic distortion;

[0019] The first test result satisfies the first test requirement, and also includes:

[0020] The first test value of total harmonic distortion in the first test result matches the first theoretical value of total harmonic distortion corresponding to the first test result;

[0021] The first apparent power matches the theoretical value of the apparent power corresponding to the first test result;

[0022] The second test result satisfies the second test requirement, and also includes:

[0023] The second test value of total harmonic distortion in the second test result matches the second theoretical value of total harmonic distortion corresponding to the second test result;

[0024] The second apparent power matches the second theoretical value of the apparent power corresponding to the second test result.

[0025] Preferably, the plurality of intermediate frequency auxiliary power supply modules are generated according to a set construction standard.

[0026] Preferably, the set construction criteria include:

[0027] The rated input voltage of the inverter in the intermediate frequency auxiliary power supply module is the set input voltage;

[0028] The switching frequency of the inverter in the intermediate frequency auxiliary power supply module is the set switching frequency;

[0029] The filtering circuit of the intermediate frequency auxiliary power supply module is a standard filtering circuit.

[0030] Preferably, the setting of construction criteria also includes:

[0031] The power supply control logic algorithm configured in the intermediate frequency auxiliary module is the set standard power supply control algorithm.

[0032] In another aspect, this application provides an auxiliary power supply module verification device, comprising:

[0033] A power supply module determining unit is used to determine multiple intermediate frequency auxiliary power supply modules to be used for grid-connected power supply, wherein the rated capacity and multiple specified output indicators of the multiple intermediate frequency auxiliary modules are the same.

[0034] The first test unit is used to connect each intermediate frequency auxiliary power supply module to a simulated medium-voltage bus, and based on the rated capacity, perform no-load, half-load, and full-load tests on the intermediate frequency auxiliary power supply module while controlling the input voltage of the intermediate frequency auxiliary power supply module to the set rated input voltage, the highest input voltage, and the lowest input voltage, respectively, to obtain multiple sets of first test results corresponding to the intermediate frequency auxiliary power supply module. The first test results include: first active power, first reactive power, first apparent power, and the first test values ​​of each of the multiple specified output indicators.

[0035] The second test unit is used to connect the plurality of intermediate frequency auxiliary power supply modules in parallel to a simulated medium-voltage bus. Based on the rated capacity, and with the input voltage of each intermediate frequency auxiliary power supply module controlled to the set rated input voltage, maximum input voltage, and minimum input voltage respectively, the unit performs no-load, half-load, and full-load tests on each intermediate frequency auxiliary power supply module to obtain multiple sets of second test results corresponding to each intermediate frequency auxiliary power supply module. The second test results include: second active power, second reactive power, second apparent power, and second test values ​​of the plurality of specified output indicators.

[0036] The test verification unit is used to determine that the plurality of intermediate frequency auxiliary power supply modules are suitable for grid-connected power supply if the first test result meets the first test requirement, the second test result meets the second test requirement, and the second reactive power and the second active power corresponding to different intermediate frequency auxiliary power supply modules are the same.

[0037] Preferably, the multiple specified output indicators corresponding to the intermediate frequency auxiliary power supply module determined by the power supply control module include: output voltage and output frequency.

[0038] Preferably, when the test verification unit confirms that the first test result meets the first test requirement, it is specifically used for:

[0039] Based on the first control line between reactive power and reference output voltage, the reference output voltage corresponding to the first reactive power in the first test result is determined as the first test value of the output voltage in the first test result;

[0040] Based on the second control line between active power and reference output frequency, the reference output frequency corresponding to the first active power in the first test result is determined as the first test value of the output frequency in the first test result;

[0041] When the verification test unit confirms that the second test result meets the second test requirements, it is specifically used for:

[0042] Based on the first control line, the reference output voltage corresponding to the second reactive power in the second test result is determined as the second test value of the output voltage in the second test result;

[0043] Based on the second control line, the reference output frequency corresponding to the second active power in the second test result is determined as the second test value of the output frequency in the second test result.

[0044] As can be seen from the above, in the embodiments of this application, the rated capacity and rated values ​​of multiple intermediate frequency auxiliary power supply modules to be used for grid-connected power supply are the same. Based on this, this application will test the intermediate frequency auxiliary power supply modules under different input voltages and different loads when the intermediate frequency auxiliary power supply modules are individually connected to a simulated medium-voltage bus and when multiple intermediate frequency auxiliary modules are connected to a simulated medium-voltage bus in a grid-connected manner. If the test results under multiple test methods all meet the corresponding test requirements, and when multiple intermediate frequency auxiliary power supply modules are connected in parallel to the simulated medium-voltage bus, the reactive power and active power obtained by each intermediate frequency auxiliary power supply module are the same, then it can be concluded that these multiple intermediate frequency auxiliary power supply modules are suitable for grid-connected power supply. It is evident that before using multiple intermediate frequency auxiliary power supply modules from different manufacturers for grid-connected power supply, the scheme proposed in this application can be used for testing. Only after determining that these multiple intermediate frequency auxiliary power supply modules are suitable for grid-connected power supply can they be used for grid-connected power supply. This can reduce situations such as abnormal power supply to the medium voltage bus caused by directly connecting multiple intermediate frequency auxiliary power supply modules from different manufacturers that are not suitable for grid-connected power supply. This makes it possible to use intermediate frequency auxiliary power supply modules from different manufacturers for mixed grid-connected power supply. Attached Figure Description

[0045] To more clearly illustrate the technical solutions in the embodiments of this application, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the accompanying drawings described below are only embodiments of this application. For those skilled in the art, other drawings can be obtained based on the provided drawings without creative effort.

[0046] Figure 1 This paper illustrates a flowchart of an auxiliary power supply module verification method provided in an embodiment of this application.

[0047] Figure 2 This paper illustrates a circuit topology diagram of multiple intermediate frequency auxiliary power supply modules connected to the grid in an embodiment of this application.

[0048] Figure 3 A schematic diagram of the inverter and filter circuit of the intermediate frequency auxiliary power supply module according to an embodiment of this application is shown;

[0049] Figure 4 This paper shows a schematic diagram of the relationship between reactive power and reference output voltage in an embodiment of this application.

[0050] Figure 5 This paper shows a schematic diagram of the relationship between active power and reference output frequency in an embodiment of this application.

[0051] Figure 6A schematic diagram of one composition of the auxiliary power supply module verification device provided in an embodiment of this application is shown. Detailed Implementation

[0052] The technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, and not all embodiments. Based on the embodiments of this application, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the scope of protection of this application.

[0053] like Figure 1 The diagram illustrates a flowchart of an auxiliary power supply module verification method provided in this embodiment. The method of this embodiment may include:

[0054] S101, identify multiple intermediate frequency auxiliary power supply modules to be used for grid-connected power supply.

[0055] The rated capacity and rated values ​​of the multiple intermediate frequency auxiliary power supply modules are the same, as are the rated values ​​of the multiple specified output indicators. For example, the rated capacity of each intermediate frequency auxiliary power supply module can be 220KVA.

[0056] These specified output parameters may include output voltage and output frequency. Correspondingly, the rated output voltage and rated output frequency of the multiple intermediate frequency auxiliary power supply modules are the same.

[0057] The rated output voltage and rated output frequency can have a certain range of fluctuation. Therefore, if the rated output voltage and rated output frequency are the same, they can remain consistent within a certain fluctuation range. For example, the rated output voltage of each intermediate frequency auxiliary power supply module can be 380V±5%, and the rated output frequency can be 50Hz±1Hz.

[0058] Furthermore, these multiple specified output parameters also include Total Harmonic Distortion (THD), and correspondingly, the THD ratings for multiple intermediate frequency auxiliary power supply modules are also the same.

[0059] It is understandable that the circuit topology in high-speed trains that uses grid-connected mode to supply power to medium-voltage loads can be as follows: Figure 2 As shown in the diagram, each intermediate frequency auxiliary power supply module 201 is connected in parallel to the intermediate voltage bus 202, while the intermediate voltage load 203 obtains power through the intermediate voltage bus, rather than directly from any intermediate frequency auxiliary power supply module. The intermediate voltage load refers to a load device that requires intermediate voltage (e.g., 380V) power.

[0060] The research conducted in this application revealed that the specific reason why all intermediate frequency auxiliary power supply modules connected to the intermediate voltage bus in a high-speed train should be from the same manufacturer and of the same model is to ensure that the output phase and phase sequence of each intermediate frequency auxiliary power supply module are consistent. Otherwise, it may lead to circuit failures and malfunctions in the intermediate voltage bus.

[0061] Therefore, in order to enable intermediate frequency auxiliary power supply modules from different manufacturers to be mixed together for grid-connected power supply, the intermediate frequency power supply modules from different manufacturers need to be able to output three-phase AC power with the same phase, the same frequency, and the same amplitude to the power supply bus.

[0062] In order to test whether these multiple intermediate frequency auxiliary power supply modules can output three-phase AC power with the same phase, frequency and amplitude to the power supply bus, in addition to selecting intermediate frequency auxiliary power supply modules with the same rated capacity, rated output voltage and rated output frequency, in order to ensure reliability, it is also necessary to verify it in the following way in this embodiment.

[0063] Furthermore, in order to ensure that intermediate frequency auxiliary power supply modules from different manufacturers can be mixed together for grid-connected power supply, this application may also specify the setting standards that different intermediate frequency auxiliary power supply modules that need to be mixed must meet. These setting standards can be agreed upon by the train set and different manufacturers.

[0064] Based on this, in one implementation, the plurality of intermediate frequency auxiliary power supply modules determined in this application are generated according to a set construction standard.

[0065] This configuration standard can at least specify the specific form of the inverter and filter circuit of the intermediate frequency auxiliary power supply module. For example, this configuration standard may include:

[0066] The rated input voltage of the inverter in the intermediate frequency auxiliary power supply module is the set input voltage;

[0067] The switching frequency of the inverter in the intermediate frequency auxiliary power supply module is the set switching frequency;

[0068] The filtering circuit of the intermediate frequency auxiliary power supply module is a standard filtering circuit.

[0069] In this case, the rated input voltage of the inverter in each intermediate frequency auxiliary power supply module is the set input voltage, so the rated input voltage of the inverter in each intermediate frequency auxiliary power supply module is the same.

[0070] If the switching frequency of the inverters in the intermediate frequency auxiliary power supply module is the same as the set switching frequency, then the switching frequency of the inverters in the multiple intermediate frequency auxiliary power supply modules will be the same.

[0071] The standard filter circuit can also be preset. This standard filter circuit can include the circuit configuration of a standard filter circuit and the parameters of at least some of the components within it. Similarly, when the filter circuits in different intermediate frequency auxiliary power supply modules all use standard filter circuits, not only will the composition and configuration of the filter circuits be the same in different intermediate frequency auxiliary power supply modules, but the parameters of some components will also be identical.

[0072] For example, the parameter values ​​of capacitors, inductors, current sensors, and voltage sensors in a standard filter circuit can be set so that the parameter values ​​of capacitors, inductors, voltage sensors, and current sensors in the same circuit position in different intermediate frequency auxiliary power supply modules are the same.

[0073] For example, the parameter values ​​of capacitors and inductors in the standard filter circuit can be set only according to actual needs, so that the parameter values ​​of capacitors and inductors in the same circuit position in different intermediate frequency auxiliary power supply modules are the same, while the specific parameter values ​​of current sensors and voltage sensors are not required.

[0074] For example, such as Figure 3 As shown, it illustrates a circuit structure diagram of the filter circuit of the intermediate frequency auxiliary power supply module in this application.

[0075] exist Figure 3 In the circuit section following inverter 301, there is a filter circuit.

[0076] exist Figure 3 In the inverter 301, three current sensors are connected first, namely current sensor i1, current sensor i2, and current sensor i3; after the three current sensors, a first filter inductor (e.g., Figure 3 Filter inductors L11, L12, and L13), and filter capacitors (such as...) Figure 3 (3 filter capacitors in the middle), voltage sensor (such as) Figure 3 The three filter capacitors are connected in parallel with voltage sensors V11, V12, and V13 respectively; the second filter inductor (such as...) Figure 3 The filter circuit consists of filter inductors L21, L22, and L23, and is finally connected to the medium voltage bus via output contactor 302.

[0077] In this application, the filter circuits in the intermediate frequency auxiliary power supply modules produced by different manufacturers are all adopted. Figure 3 Given the circuit structure of the filter circuit, the parameter values ​​of the filter capacitor, the first filter inductor, and the second filter inductor in the filter circuit of the intermediate frequency auxiliary power supply modules produced by various manufacturers are also the same.

[0078] For example, the first filter inductor can be set to 120uH, the filter capacitor can be set to 40uF, and the second filter inductor can be set to 40uH.

[0079] Understandable, Figure 3 The filter circuit shown is merely an example; in practical applications, the standard filter circuit can have other possibilities. For instance, the standard filter circuit can also include... Figure 3 The second filter inductor is not set on the basis of the above. Of course, there are other possible forms, and there are no restrictions on them.

[0080] Understandably, a medium-frequency auxiliary power supply module can include: a DC-DC converter, a resonant converter (also known as a high-frequency transformer), an inverter, and a filter circuit. Since the AC power output from the inverter is filtered by the filter circuit before being supplied to the medium-voltage bus, if the input voltage and switching frequency of the inverters in different medium-frequency auxiliary power supply modules are the same, and the filter circuits are also the same, the output parameters of different medium-frequency auxiliary power supply modules can remain consistent.

[0081] It is understandable that, considering that the power supply control logic of the intermediate frequency auxiliary power supply module that needs to be connected to the grid may also affect the output parameters of the intermediate frequency auxiliary power supply module in a short period of time, the standard setting also includes: the power supply control logic algorithm configured in the intermediate frequency auxiliary module is the set standard power supply control algorithm.

[0082] The power supply control logic algorithm is mainly used to control the startup process of the intermediate frequency auxiliary power supply module when there is input power. This standard power supply control algorithm can be set as needed and is not restricted.

[0083] To make it easier to understand, let's take an example:

[0084] The control process of the power supply control logic algorithm can be as follows:

[0085] If the intermediate frequency auxiliary power supply module is the first among multiple intermediate frequency auxiliary power supply modules supplying power to the grid to have an output voltage, then the intermediate frequency auxiliary power supply module can control the inverter output voltage from soft start to the normal output voltage (e.g., 380V). If the intermediate frequency auxiliary power supply module is not the first among the multiple intermediate frequency auxiliary power supply modules to output voltage, that is, if the medium voltage bus is already energized, then the inverter can be controlled to ensure that the inverter output voltage is consistent with the normal voltage of the medium voltage bus (e.g., 380V) before outputting to the medium voltage bus.

[0086] S102, for each intermediate frequency auxiliary power supply module, the intermediate frequency auxiliary power supply module is connected to a simulated medium voltage bus. Based on the rated capacity, the intermediate frequency auxiliary power supply module is subjected to no-load, half-load and full-load tests while controlling the input voltage of the intermediate frequency auxiliary power supply module to the set rated input voltage, the highest input voltage and the lowest input voltage respectively, so as to obtain multiple sets of first test results corresponding to the intermediate frequency auxiliary power supply module.

[0087] The grid connection power supply test in this application is not an on-site test inside the EMU, so it is necessary to construct a simulated medium-voltage busbar to simulate the medium-voltage busbar inside the EMU.

[0088] The connection of the intermediate frequency auxiliary power supply module to the simulated medium-voltage bus can be achieved by computer equipment controlling the connection between the module and the bus after the user completes the line connection. Alternatively, the connection can be made manually.

[0089] The rated input voltage set here can be considered as the rated input voltage of the intermediate frequency auxiliary power supply module, or the rated input voltage of the inverter in the intermediate frequency auxiliary power supply module. The maximum and minimum input voltages are preset, representing the highest and lowest voltages required for testing the intermediate frequency auxiliary power supply module. Generally, these maximum and minimum input voltages can be selected from the maximum and minimum input voltages that each intermediate frequency auxiliary power supply module can withstand.

[0090] It is understood that in this application, the output phase, output frequency and amplitude of the multiple intermediate frequency auxiliary power supply modules need to be consistent for them to be able to be connected to the grid. Therefore, the rated input voltage requirement for the multiple intermediate frequency auxiliary power supply modules can be the same. Based on this, the rated input voltage, maximum input voltage and minimum input voltage used to test each intermediate frequency auxiliary power supply module in this step are the same.

[0091] In this context, "no load" means that the load connected to the simulated medium-voltage bus is empty; "half load" means that the power of the medium-voltage load requiring power supply on the simulated medium-voltage bus is half the rated capacity of the intermediate frequency auxiliary power supply module, so that the load supplied by the intermediate frequency auxiliary power supply module is half its rated capacity; and "full load" means that the power of the medium-voltage load requiring power supply on the simulated medium-voltage bus is equal to the rated capacity of the intermediate frequency auxiliary power supply module.

[0092] Understandably, different test results can be obtained under different input voltages and different loads. Therefore, this step actually includes nine test conditions, resulting in nine test results. These nine test conditions are: rated input voltage and no-load condition, rated input voltage and half-load condition, rated input voltage and full-load condition, highest input voltage and no-load condition, highest input voltage and half-load condition, highest input voltage and full-load condition, lowest input voltage and no-load condition, lowest input voltage and half-load condition, and lowest input voltage and full-load condition.

[0093] For ease of distinction, the test result obtained from the individual test of a single intermediate frequency auxiliary power supply module in step S102 is referred to as the first test result. Accordingly, nine first test results can be obtained under the above nine test conditions.

[0094] Each first test result includes: first active power, first reactive power, first apparent power, and the first test value of each of the aforementioned specified output indicators.

[0095] For example, if the specified output parameters include output voltage, output frequency and total harmonic distortion, then the first test result can obtain the first test value of the output voltage, the first test value of the output frequency and the first test value of the total harmonic distortion.

[0096] S103, the multiple intermediate frequency auxiliary power supply modules are connected in parallel to the simulated medium voltage bus. Based on the rated capacity, and with the input voltage of each intermediate frequency auxiliary power supply module controlled to the set rated input voltage, maximum input voltage and minimum input voltage respectively, no-load, half-load and full-load tests are performed on each intermediate frequency auxiliary power supply module to obtain multiple sets of second test results corresponding to each intermediate frequency auxiliary power supply module.

[0097] In step S103, the output indicators and related parameters of each intermediate frequency auxiliary power supply module are simulated when the multiple intermediate frequency auxiliary power supply modules are connected to the grid.

[0098] Here, the setting of rated voltage, maximum input voltage, and minimum input voltage is the same as in step S102. Similarly, the meanings of no-load, half-load, and full-load are the same as in the previous steps, and will not be repeated here.

[0099] Step S103 also involves nine test conditions, the same as in the previous step, except that this step requires multiple intermediate frequency auxiliary power supply modules to be connected in parallel to a simulated medium-voltage bus. Accordingly, test results can be obtained under nine test conditions for each intermediate frequency auxiliary power supply module; that is, each intermediate frequency auxiliary power supply module corresponds to nine test results. For ease of distinction, the test results obtained in this step are referred to as the second test results.

[0100] Each second test result includes: second active power, second reactive power, second apparent power, and second test values ​​of the plurality of specified output indicators;

[0101] For example, specified output parameters include output voltage, output frequency, and total harmonic distortion (THD). Accordingly, the second test results may include a second test value for the output voltage, a second test value for the output frequency, and a second test value for the THD.

[0102] It should be noted that in step S103, any two intermediate frequency auxiliary power supply modules can be tested. Correspondingly, in the subsequent step S104, these two intermediate frequency auxiliary power supply modules can be used to determine whether they are suitable for grid-connected power supply, ultimately identifying at least two intermediate frequency auxiliary power supply modules that can be connected to the grid for power supply. Of course, it is also possible to connect all of these intermediate frequency auxiliary power supply modules in parallel to a simulated medium-voltage bus for unified testing, without any restrictions.

[0103] S104. If the first test result meets the first test requirement, the second test result meets the second test requirement, and the second reactive power and second active power corresponding to different intermediate frequency auxiliary power supply modules are the same, it is determined that multiple intermediate frequency auxiliary power supply modules are suitable for grid-connected power supply.

[0104] The fact that each intermediate frequency auxiliary power supply module has the same second reactive power and the same second active power is to ensure that, when multiple intermediate frequency auxiliary power supply modules are connected to the grid, each intermediate frequency auxiliary power supply module can equally share the reactive power and active power of the load connected to the medium voltage bus.

[0105] It is understandable that for any given intermediate frequency auxiliary power supply module, each first test result corresponds to a test result obtained under one test condition, provided it is connected to a medium-voltage bus alone. Therefore, the first test requirements that different first test results need to meet may differ. Similarly, the second test requirements corresponding to different second test results may also differ.

[0106] Based on this, the first test requirement corresponding to a certain first test result can be the first test requirement that needs to be met under the test conditions corresponding to the first test result. The first test requirement can be the pre-set conditions that need to be met for each test value or between test values ​​in the first test result.

[0107] Similarly, a second test requirement corresponding to a second test result can be a second test requirement that needs to be met under the test conditions corresponding to the second test result. This second test requirement can be a pre-set condition that needs to be met for each test value or between test values ​​in the first test result.

[0108] In one possible scenario, considering the need for grid connection, the intermediate frequency (IF) auxiliary power supply modules are connected to the medium-voltage bus (either individually or in parallel). Given a fixed load connected to the IF auxiliary power supply modules (or the medium-voltage bus), the output voltage, output frequency, reactive power, and active power of each IF auxiliary power supply module should be identical. Furthermore, there is a fixed relationship between the output voltage and reactive power of the IF auxiliary power supply module; similarly, there is also a fixed relationship between the output frequency and active power of the IF auxiliary power supply module.

[0109] Based on this, the first test result that meets the first test requirement may include:

[0110] For a first test result, based on the first control line between reactive power and reference output voltage, the reference output voltage corresponding to the first reactive power in the first test result is determined as the first test value of the output voltage in the first test result;

[0111] Based on the second control line between active power and reference output frequency, the reference output frequency corresponding to the first active power in the first test result is determined as the first test value of the output frequency in the first test result.

[0112] Accordingly, the second test result meets the second test requirements, including:

[0113] Based on the first control line, the reference output voltage corresponding to the second reactive power in the second test result is determined as the second test value of the output voltage in the second test result;

[0114] Based on the second control line, the reference output frequency corresponding to the second active power in the second test result is determined as the second test value of the output frequency in the second test result.

[0115] For example, see Figure 4 It shows a schematic diagram of the first control line between reactive power and reference output voltage.

[0116] exist Figure 4 In the diagram, the horizontal axis represents reactive power Q, and the vertical axis represents output voltage V.

[0117] Figure 4 The diagonal line in the middle is the first control line. Figure 4 In this context, the relationship between reactive power and output voltage conforms to the first control line. Based on this, when reactive power is determined, output voltage is also determined, and vice versa.

[0118] like Figure 4 When the reactive power is 130 kVAr, the output voltage is 360 V. When the reactive power is -90 kVAr, the output voltage is 415 V.

[0119] based on Figure 4 It can be seen that if the output voltage and reactive power do not conform to the first control line, it indicates that the output voltage or output power of the intermediate frequency auxiliary power supply module is incorrect, and therefore does not meet the conditions for grid connection with other intermediate frequency auxiliary power supply modules.

[0120] akin, Figure 5 A schematic diagram of the second control line between active power and output frequency is shown.

[0121] exist Figure 5 In the diagram, the horizontal axis represents active power P, and the vertical axis represents output power f. Figure 5 The slash in the middle represents the second control line.

[0122] exist Figure 5 Based on this, it can be known that if multiple intermediate frequency auxiliary power supply modules are connected to the grid, then the active power output and output power of any intermediate frequency auxiliary power supply module will meet the requirements. Figure 5 The second control line in the system.

[0123] like Figure 5 As shown, when the active power of the intermediate frequency auxiliary power supply module is 230kW, the output frequency of the intermediate frequency auxiliary power supply module should be 49.6Hz. When the active power is 0, the output frequency should be 40.4Hz.

[0124] certainly, Figure 4 and Figure 5 This is just one example of the first and second control lines. In practical applications, the specific forms of the first and second control lines may also be other.

[0125] It is understandable that, in order to ensure that the outputs of different intermediate frequency auxiliary power supply modules remain consistent under the same test environment and test conditions, this application also needs to check whether the test values ​​of each indicator in the first test result meet the theoretical values ​​of each test indicator corresponding to the first test result.

[0126] For example, assuming that a single intermediate frequency auxiliary power supply module is connected to a simulated medium-voltage bus and the load is full, the theoretical values ​​of active power, reactive power, apparent power, output voltage and output frequency of the intermediate frequency auxiliary power supply module can be obtained in advance, and the test values ​​of these results can be checked to see if they are consistent with their respective theoretical values.

[0127] Specifically, based on the preceding analysis of whether the test requirements are met in conjunction with the control lines, if the first test result in this application meets the first test requirements, it may also include:

[0128] The first test value of total harmonic distortion in the first test result matches the first theoretical value of total harmonic distortion corresponding to the first test result;

[0129] The first apparent power matches the theoretical value of the apparent power corresponding to the first test result;

[0130] Accordingly, the second test result meeting the second test requirements may also include:

[0131] The second test value of total harmonic distortion in the second test result matches the second theoretical value of total harmonic distortion corresponding to the second test result;

[0132] The second apparent power matches the second theoretical value of the apparent power corresponding to the second test result.

[0133] In this embodiment, the rated capacity and rated values ​​of multiple specified output indicators of the multiple intermediate frequency auxiliary power supply modules to be used for grid-connected power supply are the same. Based on this, this application will test the intermediate frequency auxiliary power supply modules under different input voltages and loads when the intermediate frequency auxiliary power supply modules are individually connected to a simulated medium-voltage bus and when multiple intermediate frequency auxiliary modules are connected to a simulated medium-voltage bus in parallel. If the test results under multiple test methods all meet the corresponding test requirements, and when multiple intermediate frequency auxiliary power supply modules are connected in parallel to the simulated medium-voltage bus, the reactive power and active power obtained by each intermediate frequency auxiliary power supply module are the same, then it can be concluded that these multiple intermediate frequency auxiliary power supply modules are suitable for grid-connected power supply. It is evident that before using multiple intermediate frequency auxiliary power supply modules from different manufacturers for grid-connected power supply, the scheme proposed in this application can be used for testing. Only after determining that these multiple intermediate frequency auxiliary power supply modules are suitable for grid-connected power supply can they be used for grid-connected power supply. This can reduce situations such as abnormal power supply to the medium voltage bus caused by directly connecting multiple intermediate frequency auxiliary power supply modules from different manufacturers that are not suitable for grid-connected power supply. This makes it possible to use intermediate frequency auxiliary power supply modules from different manufacturers for mixed grid-connected power supply.

[0134] In particular, under the premise that this application requires each manufacturer to construct the intermediate frequency auxiliary power supply module according to the aforementioned construction standards, and then test it through the scheme of this application, it is possible to further effectively analyze whether multiple intermediate frequency auxiliary power supply modules are suitable for grid-connected power supply, thereby selecting multiple intermediate frequency auxiliary power supply modules that can output the same frequency, output phase and output amplitude in grid-connected power supply mode.

[0135] In accordance with the auxiliary power supply module verification method of this application, this application also provides an auxiliary power supply module verification device.

[0136] like Figure 6 The diagram shown illustrates one possible structural composition of an auxiliary power supply module verification device according to this application. The device in this embodiment may include:

[0137] The power supply module determining unit 601 is used to determine multiple intermediate frequency auxiliary power supply modules to be used for grid-connected power supply, wherein the rated capacity and multiple specified output indicators of the multiple intermediate frequency auxiliary modules are the same.

[0138] The first test unit 602 is used to connect the intermediate frequency auxiliary power supply module to a simulated medium-voltage bus for each intermediate frequency auxiliary power supply module. Based on the rated capacity, and with the input voltage of the intermediate frequency auxiliary power supply module controlled at the set rated input voltage, the highest input voltage, and the lowest input voltage respectively, the unit performs no-load, half-load, and full-load tests on the intermediate frequency auxiliary power supply module to obtain multiple sets of first test results corresponding to the intermediate frequency auxiliary power supply module. The first test results include: first active power, first reactive power, first apparent power, and the first test values ​​of each of the multiple specified output indicators.

[0139] The second test unit 603 is used to connect the plurality of intermediate frequency auxiliary power supply modules in parallel to a simulated medium voltage bus. Based on the rated capacity, and with the input voltage of each intermediate frequency auxiliary power supply module controlled to the set rated input voltage, the highest input voltage, and the lowest input voltage respectively, the unit performs no-load, half-load, and full-load tests on each intermediate frequency auxiliary power supply module to obtain multiple sets of second test results corresponding to each intermediate frequency auxiliary power supply module. The second test results include: second active power, second reactive power, second apparent power, and second test values ​​of the plurality of specified output indicators.

[0140] The test verification unit 604 is used to determine that the plurality of intermediate frequency auxiliary power supply modules are suitable for grid-connected power supply if the first test result meets the first test requirement, the second test result meets the second test requirement, and the second reactive power and the second active power corresponding to different intermediate frequency auxiliary power supply modules are the same.

[0141] In one possible implementation, the power supply control module determines multiple specified output indicators corresponding to the intermediate frequency auxiliary power supply module, including: output voltage and output frequency.

[0142] In another possible implementation, when the test verification unit confirms that the first test result meets the first test requirement, it is specifically used for:

[0143] Based on the first control line between reactive power and reference output voltage, the reference output voltage corresponding to the first reactive power in the first test result is determined as the first test value of the output voltage in the first test result;

[0144] Based on the second control line between active power and reference output frequency, the reference output frequency corresponding to the first active power in the first test result is determined as the first test value of the output frequency in the first test result;

[0145] When the verification test unit confirms that the second test result meets the second test requirements, it is specifically used for:

[0146] Based on the first control line, the reference output voltage corresponding to the second reactive power in the second test result is determined as the second test value of the output voltage in the second test result;

[0147] Based on the second control line, the reference output frequency corresponding to the second active power in the second test result is determined as the second test value of the output frequency in the second test result.

[0148] It should be noted that the various embodiments in this specification are described in a progressive manner, with each embodiment focusing on its differences from other embodiments. Similar or identical parts between embodiments can be referred to interchangeably. Furthermore, the features described in the various embodiments of this specification can be substituted or combined with each other, enabling those skilled in the art to implement or use this application. For apparatus embodiments, since they are basically similar to method embodiments, the description is relatively simple; relevant parts can be referred to the descriptions of the method embodiments.

[0149] Finally, it should be noted that in this document, relational terms such as "first" and "second" are used only to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. Without further limitations, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes the element.

[0150] 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.

[0151] The above are merely preferred embodiments of this application. It should be noted that those skilled in the art can make various improvements and modifications without departing from the principles of this application, and these improvements and modifications should also be considered within the scope of protection of this application.

Claims

1. A method for verifying an auxiliary power supply module, characterized in that, include: A plurality of intermediate frequency auxiliary power supply modules are determined to be used for grid-connected power supply, wherein the rated capacity and the rated values ​​of a plurality of specified output indicators of the plurality of intermediate frequency auxiliary power supply modules are the same; For each intermediate frequency auxiliary power supply module, the intermediate frequency auxiliary power supply module is connected to a simulated medium-voltage bus. Based on the rated capacity, and with the input voltage of the intermediate frequency auxiliary power supply module controlled at the set rated input voltage, the highest input voltage, and the lowest input voltage, no-load, half-load, and full-load tests are performed on the intermediate frequency auxiliary power supply module to obtain multiple sets of first test results corresponding to the intermediate frequency auxiliary power supply module. The first test results include: first active power, first reactive power, first apparent power, and the first test values ​​of each of the multiple specified output indicators. The multiple intermediate frequency auxiliary power supply modules are connected in parallel to a simulated medium-voltage bus. Based on the rated capacity, and with the input voltage of each intermediate frequency auxiliary power supply module controlled at the set rated input voltage, maximum input voltage, and minimum input voltage, no-load, half-load, and full-load tests are performed on each intermediate frequency auxiliary power supply module to obtain multiple sets of second test results for each intermediate frequency auxiliary power supply module. The second test results include: second active power, second reactive power, second apparent power, and second test values ​​of the multiple specified output indicators. If the first test result meets the first test requirement, the second test result meets the second test requirement, and the second reactive power and second active power corresponding to different intermediate frequency auxiliary power supply modules are the same, then it is determined that the plurality of intermediate frequency auxiliary power supply modules are suitable for grid-connected power supply.

2. The method according to claim 1, characterized in that, The specified output parameters include: output voltage and output frequency.

3. The method according to claim 2, characterized in that, The first test result satisfies the first test requirement, including: Based on the first control line between reactive power and reference output voltage, the reference output voltage corresponding to the first reactive power in the first test result is determined as the first test value of the output voltage in the first test result; Based on the second control line between active power and reference output frequency, the reference output frequency corresponding to the first active power in the first test result is determined as the first test value of the output frequency in the first test result; The second test result meets the second test requirements, including: Based on the first control line, the reference output voltage corresponding to the second reactive power in the second test result is determined as the second test value of the output voltage in the second test result; Based on the second control line, the reference output frequency corresponding to the second active power in the second test result is determined as the second test value of the output frequency in the second test result.

4. The method according to claim 3, characterized in that, The specified output metrics also include: total harmonic distortion; The first test result satisfies the first test requirement, and also includes: The first test value of total harmonic distortion in the first test result matches the first theoretical value of total harmonic distortion corresponding to the first test result; The first apparent power matches the theoretical value of the apparent power corresponding to the first test result; The second test result satisfies the second test requirement, and also includes: The second test value of total harmonic distortion in the second test result matches the second theoretical value of total harmonic distortion corresponding to the second test result; The second apparent power matches the second theoretical value of the apparent power corresponding to the second test result.

5. The method according to claim 1, characterized in that, The multiple intermediate frequency auxiliary power supply modules were generated according to the set construction standards.

6. The method according to claim 5, characterized in that, The established construction criteria include: The rated input voltage of the inverter in the intermediate frequency auxiliary power supply module is the set input voltage; The switching frequency of the inverter in the intermediate frequency auxiliary power supply module is the set switching frequency; The filtering circuit of the intermediate frequency auxiliary power supply module is a standard filtering circuit.

7. The method according to claim 6, characterized in that, The established construction criteria also include: The power supply control logic algorithm configured in the intermediate frequency auxiliary power supply module is a standard power supply control algorithm.

8. An auxiliary power supply module verification device, characterized in that, include: The power supply module determining unit is used to determine multiple intermediate frequency auxiliary power supply modules to be used for grid-connected power supply, wherein the rated capacity and multiple specified output indicators of the multiple intermediate frequency auxiliary power supply modules are the same. The first test unit is used to connect each intermediate frequency auxiliary power supply module to a simulated medium-voltage bus, and based on the rated capacity, perform no-load, half-load, and full-load tests on the intermediate frequency auxiliary power supply module while controlling the input voltage of the intermediate frequency auxiliary power supply module to the set rated input voltage, the highest input voltage, and the lowest input voltage, respectively, to obtain multiple sets of first test results corresponding to the intermediate frequency auxiliary power supply module. The first test results include: first active power, first reactive power, first apparent power, and the first test values ​​of each of the multiple specified output indicators. The second test unit is used to connect the plurality of intermediate frequency auxiliary power supply modules in parallel to a simulated medium-voltage bus. Based on the rated capacity, and with the input voltage of each intermediate frequency auxiliary power supply module controlled to the set rated input voltage, maximum input voltage, and minimum input voltage respectively, the unit performs no-load, half-load, and full-load tests on each intermediate frequency auxiliary power supply module to obtain multiple sets of second test results corresponding to each intermediate frequency auxiliary power supply module. The second test results include: second active power, second reactive power, second apparent power, and second test values ​​of the plurality of specified output indicators. The test verification unit is used to determine that the plurality of intermediate frequency auxiliary power supply modules are suitable for grid-connected power supply if the first test result meets the first test requirement, the second test result meets the second test requirement, and the second reactive power and the second active power corresponding to different intermediate frequency auxiliary power supply modules are the same.

9. The apparatus according to claim 8, characterized in that, The specified output parameters corresponding to the intermediate frequency auxiliary power supply module of the power supply module determination unit include: output voltage and output frequency.

10. The apparatus according to claim 8, characterized in that, When the test verification unit confirms that the first test result meets the first test requirement, it is specifically used for: Based on the first control line between reactive power and reference output voltage, the reference output voltage corresponding to the first reactive power in the first test result is determined as the first test value of the output voltage in the first test result; Based on the second control line between active power and reference output frequency, the reference output frequency corresponding to the first active power in the first test result is determined as the first test value of the output frequency in the first test result; When confirming that the second test result meets the second test requirements, the test verification unit is specifically used for: Based on the first control line, the reference output voltage corresponding to the second reactive power in the second test result is determined as the second test value of the output voltage in the second test result; Based on the second control line, the reference output frequency corresponding to the second active power in the second test result is determined as the second test value of the output frequency in the second test result.

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