Inverter Wiring Inspection Method, Device and Medium

Abstract

The technical solution of the present invention discloses a method for checking the wiring of an inverter. Another technical solution of the present invention provides an inverter wiring inspection device. Another technical solution of the present invention provides a computer-readable storage medium, characterized in that the computer-readable storage medium stores instructions, which, when running on a computer, cause the computer to execute the above-mentioned inverter wiring inspection method. The present invention proposes a method for detecting whether the wiring of the drive signal line and the current and voltage sensors is correct. During the self-check stage before the device starts running, it is only necessary to sample the three-phase voltage at both ends of the load, the three-phase voltage output by the inverter, and the three-phase current output by the inverter, and compare them with the calculated standard range after coordinate transformation to determine whether the wiring of the corresponding part is correct. If the sampled value is within the standard range, it indicates that the wiring is correct and subsequent actions can be carried out, which has strong practicability.

Description

Technical Field

[0001] The present invention relates to an inverter wiring inspection method, device and medium, belonging to the technical field of power electronics. Background Art

[0002] Before a new energy grid-connected inverter operates normally, the entire system needs to perform self-inspection. Due to product limitations, it is impossible to integrate all functional components on a single circuit board, and sometimes the distance between two connected circuit boards is relatively far, and the lines are intertwined and complex. Therefore, when performing system self-inspection, it is necessary to manually connect the wiring ports and sensors between different circuit boards, and wiring errors will inevitably occur when humans are involved in wiring.

[0003] Among them, it is particularly important to ensure the correct phase sequence of the system after manual wiring. In a centralized inverter, the sensor wiring of the grid voltage, inverter voltage, and inverter current, as well as the drive signal lines, are all connected through cable lines, and manual operation is also required. Whether the phase sequence connection of the main circuit is incorrect or the three-phase sampling signal line connection is incorrect, it will cause abnormal operation of the control board, resulting in control disorders, and may even cause the inverter to explode, seriously endangering personal safety.

[0004] Therefore, the sampling signal lines and drive signal lines of the inverter should be strictly inspected before the inverter operates formally. However, since almost all traditional methods rely on staff to perform manual line inspections, accidents will inevitably occur, resulting in serious consequences. Therefore, how to ensure the correct phase sequence of the system without relying on manual line inspections is a key problem that needs to be solved by those skilled in the art. Summary of the Invention

[0005] The technical problem to be solved by the present invention is: how to confirm the correct connection of the main circuit phase sequence, the sampling signal lines and drive signal lines of the inverter.

[0006] In order to solve the above technical problem, the technical solution of the present invention is to provide an inverter wiring inspection method, which is characterized by including the following steps:

[0007] Step 1: After connecting a load to the inverter operating in the open-loop mode, perform switching control on the inverter;

[0008] Step 2: Calculate the standard d-axis and q-axis components of the three-phase voltage across the load, the three-phase voltage output by the inverter, and the three-phase current output by the inverter in the two-phase rotating coordinate system under normal conditions respectively;

[0009] Step 3: Sample the load side voltage signal, the inverter output side three-phase voltage signal, and the inverter output side current signal respectively and calculate the corresponding d-axis and q-axis component detection values. Compare the d-axis and q-axis component detection values with the corresponding d-axis and q-axis component standard values in step 2. If they do not match, it is determined that there is a wiring error in the relevant lines on the load side or the inverter output side.

[0010] Preferably, step 2 comprises the following steps:

[0011] Step 201: Write the circuit equation of the inverter load side and calculate the standard values of the three-phase voltage across the load, the three-phase voltage output by the inverter, and the three-phase current output by the inverter under normal conditions.

[0012] Step 202: Use Clark transformation and Park transformation to convert the standard values of step 201 into the d-axis component standard value u of the three-phase voltage at both ends of the load in the two-phase rotating coordinate system. gd , q-axis component standard quantity u gq , the d-axis standard value u of the three-phase voltage output by the inverter Invd , q-axis component standard quantity u Invq , and the d-axis component standard quantity i of the three-phase current output by the inverter Ld , q-axis component standard quantity i Lq .

[0013] Preferably, in step 202, the d-axis component standard quantity u of the three-phase voltage across the load is gd And the q-axis component standard quantity u gq Use the following formula to calculate:

[0014]

[0015] Where T represents the transformation matrix, u g Indicates the three-phase voltage across the load, U Invm Indicates the output three-phase voltage peak value of the inverter, A um Indicates the magnitude of the impedance in the circuit, θ u Indicates the phase angle of the three-phase voltage across the load.

[0016] Preferably, in step 202, the d-axis component standard quantity u of the three-phase voltage output by the inverter Invd And the q-axis component standard quantity u Invq Use the following formula to calculate:

[0017]

[0018] Where T represents the transformation matrix, u Inv Indicates the voltage signal of the inverter output side, U InvmRepresents the peak value of the output three-phase voltage of the inverter.

[0019] Preferably, in step 202, the standard quantity i of the d-axis component of the three-phase current output by the inverter Ld And the standard quantity i of the q-axis component Lq Is calculated using the following formula:

[0020]

[0021] In the formula, T represents the transformation matrix, U Invm Represents the peak value of the output voltage of the inverter, A im Represents the magnitude of the admittance in the inverter circuit, θ i Represents the phase angle of the three-phase current output by the inverter.

[0022] Preferably, in step 3, if the difference between the detected values of the components on each d-axis and q-axis and the standard quantities of the corresponding d-axis and q-axis components in step 2 is outside the preset theoretical error range, it means that the detected values of the components on each d-axis and q-axis do not match their respective corresponding d-axis and q-axis component standard quantities.

[0023] Preferably, it further includes: step 4, judging the wiring error situation:

[0024] If the q-axis component of the voltage signal on the inverter output side is not 0, and the d-axis component and the q-axis component of the voltage signal on the inverter output side form an oscillating sine wave, it is judged that there is a situation where two phases are swapped in wiring;

[0025] If the d-axis component of the voltage signal on the inverter output side drops to half of U Invm And the q-axis component of the voltage signal on the inverter output side also has a value, it is judged that there is a positive sequence error situation in wiring.

[0026] Preferably, in step 4, if it is judged that there is a situation where two phases are swapped in wiring, then there is:

[0027]

[0028] In the formula, u’ Invd And u’ Invq Respectively represent the d-axis component and the q-axis component of the voltage signal on the inverter output side in the case of two-phase swapping;

[0029] If it is judged that there is a positive sequence error situation in wiring, then there is:

[0030]

[0031] In the formula, u” Invd And u” Invq Respectively represent the d-axis component and the q-axis component of the voltage signal on the inverter output side in the case of positive sequence error.

[0032] Another technical solution of the present invention provides an inverter wiring inspection device, which is characterized by including a processor and a memory. The memory is used to store instructions, and the processor is used to execute the instructions. After the processor executes the instructions, the control device executes the above-mentioned inverter wiring inspection method.

[0033] Another technical solution of the present invention provides a computer-readable storage medium, which is characterized in that the computer-readable storage medium stores instructions, and when it runs on a computer, it causes the computer to execute the above-mentioned inverter wiring inspection method.

[0034] The present invention proposes a method for detecting whether the wiring of the drive signal line and the current and voltage sensors is correct. During the self-inspection stage before the device starts running, it only needs to sample the voltage across the load, the voltage output by the inverter, and the current output by the inverter, and compare the sampled data with the calculated standard range after coordinate transformation to determine whether the wiring in this part is correct. If the sampled value is within the standard range, it indicates that the wiring is correct, and subsequent actions can be carried out, which has strong practicability. Description of the Drawings

[0035] Figure 1 Schematically shows the wiring error inspection process of the present invention;

[0036] Figure 2 Schematically shows the specific wiring detection program flow of the present invention;

[0037] Figure 3 Schematically shows the actual relevant circuit diagram based on the method disclosed in the embodiment of the present invention;

[0038] Figure 4 Schematically shows the output circuit structure of the inverter;

[0039] Figure 5A Schematically shows the d-axis component of the three-phase voltage across the load in the case of correct wiring;

[0040] Figure 5B Schematically shows the q-axis component of the three-phase voltage across the load in the case of correct wiring;

[0041] Figure 6A Schematically shows the d-axis component of the inverter voltage in the case of correct wiring;

[0042] Figure 6B Schematically shows the q-axis component of the inverter voltage in the case of correct wiring;

[0043] Figure 7A Schematically shows the d-axis component of the inverter current in the case of correct wiring;

[0044] Figure 7BSchematically shows the q-axis component of the inverter current under correct wiring conditions;

[0045] Figure 8A Schematically shows the d-axis component of the inverter voltage when the three-phase wiring is acb;

[0046] Figure 8B Schematically shows the q-axis component of the inverter voltage when the three-phase wiring is acb;

[0047] Figure 9A Schematically shows the d-axis component of the inverter voltage when the three-phase wiring is cab;

[0048] Figure 9B Schematically shows the q-axis component of the inverter voltage when the three-phase wiring is cab. Detailed implementation manners

[0049] The following further elaborates on the present invention in conjunction with specific embodiments. It should be understood that these embodiments are only used to illustrate the present invention and not to limit the scope of the present invention. In addition, it should be understood that after reading the content taught by the present invention, those skilled in the art can make various changes or modifications to the present invention, and these equivalent forms also fall within the scope defined by the appended claims of this application.

[0050] Combined with Figure 1 And Figure 2 One aspect of this embodiment is to provide a method for checking the wiring of an inverter, including the following steps:

[0051] S1: Turn the inverter into an open-loop mode and connect a load R, and perform switching control on the IGBT with a fixed duty cycle (sine law). In this embodiment, the IGBT control signal of the inverter is given in the simplest form, generally directly using a standard sine signal and driving it with a fixed duty cycle.

[0052] S2: Write the circuit equations on the load side of the inverter, and calculate the standard values of the three-phase voltages across the load, the three-phase voltages output by the inverter, and the three-phase currents output by the inverter under normal conditions. Then, according to the coordinate transformation principle, convert the three-phase voltages across the load, the three-phase voltages output by the inverter, and the three-phase currents output by the inverter into the d-axis component standard quantity u gd 、q-axis component standard quantity u gq of the three-phase voltages across the load in the two-phase rotating coordinate system, the d-axis component standard quantity u Invd 、q-axis component standard quantity u Invq of the three-phase voltages output by the inverter, and the d-axis component standard quantity i Ld 、q-axis component standard quantity i Lq of the three-phase currents output by the inverter, as shown in the following formulas (1), (2), and (3):

[0053]

[0054] In the formula, T represents the transformation matrix, and u g represents the three-phase voltage across the load, and U Invm represents the peak value of the three-phase output voltage of the inverter, and A um represents the magnitude of the impedance in the circuit, and θ u represents the phase angle of the three-phase voltage across the load, and u Inv represents the voltage signal on the inverter output side, and i L represents the three-phase current output by the inverter, and A im represents the magnitude of the admittance in the circuit, and θ i represents the phase angle of the three-phase current output by the inverter.

[0055] In this embodiment, where ω represents the angular frequency.

[0056] In the above step S2: The Clark transformation and Park transformation are used to convert the three-phase abc coordinate system into a two-phase dq coordinate system; the form of the filter circuit based on step 2 is not unique, and the present invention does not specifically limit this filter, but as a preferred implementation, an LC filter or an LCL filter can be used.

[0057] S3: Sample the voltage signal on the load side, calculate the detected values of its d-axis and q-axis components, and then compare them with u calculated by formula (1) gd and u gq If they do not match, it is necessary to immediately stop the machine and check whether the wiring of the voltage sampling signal related circuit on the load side is incorrect (for example, check whether the sampling signal line and drive signal line on the load side are connected incorrectly).

[0058] S4: Sample the voltage signal on the inverter output side, calculate the detected values of its d-axis and q-axis components, and then compare them with u calculated by formula (2) Invd and u Invq If they do not match, it is necessary to immediately stop the machine and check whether the wiring of the voltage sampling signal related circuit on the inverter output side is incorrect (for example, check whether the three-phase voltage sampling signal line output by the inverter is connected incorrectly).

[0059] S5: Sample the current signal on the inverter output side, calculate the detected values of its d-axis and q-axis components, and then compare them with i calculated by formula (3) Ld and i Lq If they do not match, it is necessary to immediately stop the machine and check whether the wiring of the current sampling signal related circuit on the inverter output side is incorrect (for example, check whether the three-phase current sampling signal line output by the inverter is connected incorrectly).

[0060] In this embodiment, the sampling signals in the above steps S3, S4, and S5 need to enter the controller and are converted into the detection values of the d-axis and q-axis components on the d and q rotating coordinate axes through the operation of the coordinate transformation matrix T, and then compared with the standard values of the d-axis and q-axis components corresponding to each. Among them, if the difference between the detection values of the d-axis and q-axis components and the standard values of the d-axis and q-axis components corresponding to each is outside the preset theoretical error range, it means that the detection values of the d-axis and q-axis components do not match the standard values of the d-axis and q-axis components corresponding to each, and further indicates that there is a wiring error in the relevant circuit. The value range of the above preset theoretical error range is 5% to 10% (including 5% and 10%) of each standard value.

[0061] S6: Calculate the d-axis component u’ of the three-phase voltage output by the inverter when the abc three phases are connected as acb (i.e., two phases are swapped) in the case of phase sequence error Invd and the q-axis component u’ Invq are:

[0062]

[0063] When the abc three phases are connected as cab (positive sequence error), the d-axis component u” of the three-phase voltage output by the inverter under the condition of positive sequence error Invd and the q-axis component u” Invq are:

[0064]

[0065] Compared with the calculation result of step S2, when there is a wiring error in which the abc three phases are connected as acb (two phases are swapped), the q-axis component of the three-phase voltage on the output side of the sampled inverter is not 0, and the d-axis and q-axis components will form an oscillating sine wave; when there is a wiring error in which the abc three phases are connected as cab (positive sequence error), the d-axis component of the three-phase voltage on the output side of the sampled inverter will be reduced to half of U Invm and the q-axis component also has a value. Therefore, this can be used as an important basis for phase sequence judgment. According to the calculation result of step S6, the wiring personnel can make a quick response to the shutdown and rectification of the machine. In addition, step S6 is mainly used for analysis and reference, and this solution mainly judges the wiring correctness according to steps S3, S4, and S5.

[0066] In this embodiment, by sampling the load-side voltage signal, the three-phase voltage signals on the inverter output side, and the current signal on the inverter output side respectively and calculating the corresponding component detection values on the d-axis and q-axis, the component detection values on the d-axis and q-axis corresponding to the load-side voltage signal, the three-phase voltage signals on the inverter output side, and the current signal on the inverter output side are respectively compared with the d-axis and q-axis component standard values of the three-phase voltage across the load, the three-phase voltage output by the inverter, and the three-phase current output by the inverter in the two-phase rotating coordinate system under normal conditions, so as to determine whether there is a wiring error in the relevant circuit on the load side or the inverter output side. If the component detection values on the d-axis and q-axis do not match the corresponding d-axis and q-axis component standard values in step 2, it is determined that there is a wiring error in the relevant circuit on the load side or the inverter output side.

[0067] From Figure 3 It can be clearly seen the specific sampling and wiring methods adopted by the above method. According to the above method: when the wiring is correct, the controller executes in sequence; when a wiring error occurs, after calculating the corresponding result through the controller, corresponding reactions are made to timely correct the wiring error.

[0068] To illustrate the differences between the above method and the conventional design method, taking Figure 4 the output circuit during the self-check of the inverter shown as an example ( Figure 4 where u Inv is the voltage signal on the inverter output side, L and C are the filter inductance and filter capacitor on the inverter output side, R is the connected load, i L is the current output by the inverter, i g and u g are the voltage and current on the load, i C is the current on the filter inductance), in the case of being off-grid and connecting the load, the following analysis process is carried out:

[0069] Calculation of the three-phase voltage output by the inverter:

[0070] Under normal conditions, when the voltage signals on the inverter output side are symmetrical, there is:

[0071]

[0072] In formula (6), u Inva , u Invb , u Invc are respectively the A-phase component, B-phase component, and C-phase component of the voltage signal on the inverter output side, θ Inv =ωt = 100πt, ignoring the influence of parasitic resistance.

[0073] Performing coordinate transformation on formula (6), the d-axis component u Invdand the q-axis component u Invq :

[0074]

[0075] In Equation (7), T is the coordinate transformation matrix. Through Equation (7), the three-phase voltage quantities on the output side of the inverter can be transformed into the dq components in the two-phase rotating coordinate system.

[0076] Calculation of the three-phase current output by the inverter:

[0077] According to Figure 4 , the three-phase current output by the inverter is transformed into the frequency domain as follows:

[0078]

[0079] Let s = jω, then:

[0080]

[0081] Then i Lm ∠θ Li = U Invm A im ∠θ i

[0082] Where: i Lm represents the amplitude of the inverter output current, θ Li and θ i represent the phase angles of the inverter output current, and there are:

[0083]

[0084] Therefore, the three-phase current i L (t) output by the inverter can be expressed as:

[0085]

[0086] Performing coordinate transformation on i L to obtain the d-axis component i Ld and the q-axis component i Lq of the inverter current in the dq rotating coordinate system:

[0087]

[0088] Calculation of the three-phase voltage across the load:

[0089] Combining Figure 1 and Equation (8), we can obtain:

[0090]

[0091] Let s = jω, then:

[0092]

[0093] Then U gm ∠θ gu = U invm A ion ∠θ u where: U gm represents the amplitude of the three-phase voltage across the load, and θ gu and θ u represent the phase angles of the three-phase voltage across the load, and there is:

[0094]

[0095]

[0096] On the load side, the three-phase voltage u g (t) is:

[0097]

[0098] Performing a coordinate transformation on u g results in the d-axis component u gd and the q-axis component u gq of the load voltage in the dq rotating coordinate system:

[0099]

[0100] When the phase sequence is incorrect (swapping the bc phases of the abc three phases), i.e., there is:

[0101]

[0102] In Equation (22), u’ Inv is the voltage signal on the output side of the inverter in the case of incorrect phase sequence. Performing a coordinate transformation on Equation (22), i.e., it is easy to obtain:

[0103]

[0104] By comparing Equation (7), it can be concluded that if a wiring error of swapping two phases occurs, the q-axis component of the sampled three-phase voltage of the inverter output will be much greater than 0, and both the d- and q-axis components will form oscillating sine waves, which is used as an important basis for phase sequence judgment.

[0105] When the positive sequence is incorrect (connecting the abc three phases as cab), i.e., there is:

[0106]

[0107] In Equation (24), u”Inv It is the voltage signal on the output side of the inverter in the case of phase sequence error. After the coordinate transformation is also carried out, that is It is easy to obtain:

[0108]

[0109] By comparing with Equation (7), the conclusion can be drawn that if the abc three phases are wrongly connected as cab, the d-axis component of the voltage signal on the inverter output side will be reduced to half of U Invm , and the q-component is no longer 0, which is used as an important basis for whether a positive sequence error occurs.

[0110] The above method will be further described below in combination with specific data.

[0111] If L f = 0.1 mH, C f = 501 μF, U bus = 1100 V, R = 1.815 Ohms, ω = 50 Hz, the inverter uses a sampling frequency of 20 kHz, and the Spwm modulation method is used with a modulation ratio m = 0.703. Then, according to Equations (7), (14), and (21), it is not difficult to obtain:

[0112]

[0113] Using Matalab for verification, the simulation results are as shown in Figure 5A , Figure 5B , Figure 6A , Figure 6B , Figure 7A and Figure 7B . Among them, Figure 5A and Figure 5B show the dq-axis components of the three-phase voltage at both ends of the load in the case of correct wiring, Figure 6A and Figure 6B show the dq-axis components of the three-phase voltage output by the inverter in the case of correct wiring, Figure 7A and Figure 7B show the dq-axis components of the three-phase current output by the inverter in the case of correct wiring.

[0114] It can be seen that the simulation results u gd = 386.7, u gq = -6.72, u Invd = 385, u Invq = -0.11, i Ld = 214.18, i Lq = 56.98 are basically the same as Equation (26) calculated theoretically according to this method, and the method disclosed in the present invention is verified.

[0115] For easier understanding of the present invention, Matlab simulations are also carried out in the case of wiring errors here, and the simulation results are as Figure 8A 、 Figure 8B 、 Figure 9A and Figure 9B shown. Figure 8A It shows the d-axis component of the three-phase voltage output by the inverter when the bc phases of the abc three phases are swapped. Figure 8B It shows the q-axis component of the three-phase voltage output by the inverter when the bc phases of the abc three phases are swapped. As can be seen from Figure 8A and Figure 8B , if the abc three phases are wrongly connected as acb, both the d-axis component and the q-axis component of the three-phase voltage output by the inverter are in an oscillating state, which is consistent with the theoretical value calculated by Equation (24). Figure 9A It shows the d-axis component of the three-phase voltage output by the inverter when the abc three phases are connected as cab. Figure 9B It shows the q-axis component of the three-phase voltage output by the inverter when the abc three phases are connected as cab. As can be seen from Figure 9A and Figure 9B , when the abc three phases are wrongly connected as cab, the d-axis component and the q-component of the three-phase voltage output by the inverter become: u Invd =-192.42, u Invq =333.47. It is very easy to make a comparison through the amplitude value, so as to judge whether the wiring is correct.

[0116] The above are examples given for more convenient understanding of the present invention. From the above examples, it can be seen that when the wiring is correct, the compared d-axis and q-axis components are both fixed values, while when different wiring errors occur, the detected and calculated different d-axis and q-axis component values are very different from the standard values when the wiring is normal. Therefore, this method can be used to accurately judge whether the wiring line is correct.

[0117] Another aspect of this embodiment is to provide an inverter wiring inspection device, including a processor and a memory. The memory is used to store instructions, and the processor is used to execute the instructions. After the processor executes the instructions, the inverter wiring inspection device executes the above-mentioned inverter wiring inspection method.

[0118] Another aspect of this embodiment is to provide a computer-readable storage medium. The computer-readable storage medium stores instructions, and when it runs on a computer, it causes the computer to execute the above-mentioned inverter wiring inspection method.

Claims

1. A method for checking the wiring of an inverter, characterized in that, It includes the following steps: Step 1: After connecting the inverter operating in open-loop mode to the load, perform switching control on the IGBT with a fixed duty cycle; Step 2: Calculate the standard d-axis and q-axis components of the three-phase voltage across the load, the three-phase voltage output by the inverter, and the three-phase current output by the inverter in the two-phase rotating coordinate system under normal conditions respectively; Step 3: Sample the load-side voltage signal, the three-phase voltage signals on the inverter output side, and the current signals on the inverter output side respectively and calculate the corresponding detected values of the d-axis and q-axis components. Compare the detected values of the d-axis and q-axis components with the corresponding standard d-axis and q-axis components in Step 2. If they do not match, it is determined that there is a wiring error in the relevant circuit on the load side or the inverter output side; Step 4: Determine the wiring error situation: If the q-axis component of the voltage signal on the inverter output side is not 0 and the d-axis and q-axis components both form oscillating sine waves, it is determined that there is a situation of two-phase swapping in the wiring, then there are: where u’ Invd and u’ Invq respectively represent the d-axis component and the q-axis component of the inverter output side voltage signal under the condition of two-phase swapping, and U Invm represents the peak value of the inverter output voltage; If the d-axis component of the inverter output side voltage signal drops to half of U Invm and the q-axis component of the inverter output side voltage signal also has a value, it is determined that there is a positive sequence error in the wiring, then: where u” Invd and u” Invq respectively represent the d-axis component and q-axis component of the inverter output side voltage signal under the positive sequence error condition.

2. The method for checking the wiring of an inverter according to claim 1, characterized in that, Step 2 includes the following steps: Step 201: Write the circuit equations on the load side of the inverter and calculate the standard values of the three-phase voltage across the load, the three-phase voltage output by the inverter, and the three-phase current output by the inverter under normal conditions; Step 202: Use the Clark transformation and Park transformation to convert each standard value in Step 201 into the d-axis component standard quantity u of the three-phase voltage across the load in the two-phase rotating coordinate system gd , and the q-axis component standard quantity u gq . The d-axis component standard quantity u Invd and the q-axis component standard quantity u Invq of the three-phase voltage output by the inverter, and the d-axis component standard quantity i Ld and the q-axis component standard quantity i Lq of the three-phase current output by the inverter.

3. The method for checking the wiring of an inverter according to claim 2, characterized in that, In step 202, the d-axis component standard quantity u of the three-phase voltage across the load gd and the q-axis component standard quantity u gq are calculated using the following formula: where T represents the transformation matrix, u g represents the three-phase voltage across the load, U Invm represents the peak value of the three-phase output voltage of the inverter, A um represents the magnitude of the impedance in the circuit, θ u represents the phase angle of the three-phase voltage across the load.

4. The method for checking the wiring of an inverter according to claim 2, characterized in that, In step 202, the d-axis component standard quantity u of the three-phase voltage output by the inverter Invd and the q-axis component standard quantity u Invq are calculated using the following formula: Where T represents the transformation matrix, u Inv represents the voltage signal on the inverse transformation output side, and U Invm represents the peak value of the output three-phase voltage of the inverter.

5. The method for checking the wiring of an inverter according to claim 2, wherein, In step 202, the d-axis component standard quantity i Ld and the q-axis component standard quantity i Lq are calculated using the following formula: where, T represents the transformation matrix, U Invm represents the peak value of the output voltage of the inverter, A im represents the magnitude of the admittance in the inverter circuit, θ i represents the phase angle of the three-phase current output by the inverter.

6. The method for checking the wiring of an inverter according to claim 1, wherein In Step 3, if the difference between the detected values of the d-axis and q-axis components and the corresponding standard d-axis and q-axis components in Step 2 is outside the preset theoretical error range, it means that the detected values of the d-axis and q-axis components do not match their respective corresponding standard d-axis and q-axis components.

7. An inverter wiring inspection device, characterized in that, It includes a processor and a memory. The memory is used to store instructions, and the processor is used to execute the instructions. After the processor executes the instructions, the control device executes the inverter wiring inspection method according to any one of claims 1-6.

8. A computer-readable storage medium, characterized in that, The computer-readable storage medium stores instructions. When it runs on a computer, it causes the computer to execute the inverter wiring inspection method according to any one of claims 1-6.

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