Three-phase power supply input open-phase detection method, device and system of three-phase Vienna circuit

Abstract

The invention discloses a three-phase power supply input open-phase detection method, device and system for a three-phase Vienna circuit, and the method comprises the steps: obtaining a first line voltage and a second line voltage of a three-phase power supply input side through a voltage transformer, and calculating a third line voltage according to the first line voltage and the second line voltage; calculating to obtain a first-path phase voltage, a second-path phase voltage and a third-path phase voltage, and synthesizing the obtained first-path phase voltage, the second-path phase voltage and the third-path phase voltage through Clark conversion and Park conversion to obtain a reconstructed q-axis voltage component and a reconstructed d-axis voltage component; a phase-locked loop is constructed, q-axis component voltage is input into the phase-locked loop for negative feedback calculation to obtain a three-phase power supply phase angle and a d-axis voltage component, and the phase of a three-phase power supply is adjusted and locked according to the obtained three-phase power supply phase angle and the d-axis voltage component. The oscillogram of the d-axis voltage component is simulated according to the voltage phase angle and the d-axis voltage component, three-phase power supply input open-phase judgment is carried out according to the difference value between the upper envelope line and the lower envelope line in the oscillogram, and open-phase judgment can be carried out without using a special open-phase hardware circuit in the process. Wherein the related three-phase input voltage detection, reconstruction and coordinate conversion algorithms belong to hardware and software functions of Vienna application, so that the application cost can be effectively saved.

Description

Technical Field

[0001] The present invention relates to the field of power grid input phase loss detection, and in particular to a three-phase power input phase loss detection method, device and system for a three-phase Vienna circuit. Background Art

[0002] In the commercial and industrial fields, three-phase power grids are generally used for power supply. For electrical equipment using three-phase AC power, one of the most basic protection functions is the three-phase AC input phase loss detection function. When any phase voltage in the three-phase AC input is missing, it can be detected, thereby providing safety protection for the electrical equipment. This patent focuses on describing the three-phase three-level Vienna circuit ( Figure 1 ) is a phase loss detection method.

[0003] Common phase loss detection is mainly performed by judging whether the single-phase voltage is lower than the corresponding threshold value, but this method is only applicable to the three-phase four-wire system. In the three-phase three-wire system, because there is coupling between the line voltages, when a phase of the input voltage is lost, the line voltage usually still has AC voltage.

[0004] Currently, there are two methods for phase loss detection: hardware detection and software detection. The common hardware detection method is to convert it into a rectangular wave through an RC circuit and a comparator, and then determine whether there is a phase loss through a logic circuit. The software detection method is to detect the two-phase voltage amplitude and the zero-crossing sequence through the zero-crossing point to make a judgment, but it is easy to misjudge when the input voltage waveform is distorted, and the implementation logic is relatively complex. Summary of the invention

[0005] The purpose of the present invention is to provide a method, device and system for detecting phase loss of a three-phase power input of a three-phase Vienna circuit, aiming to solve the technical problems mentioned in the background technology.

[0006] In order to achieve the above object, the technical solutions of the present invention are:

[0007] A method for detecting phase loss of a three-phase power input of a three-phase Vienna circuit, comprising:

[0008] Obtaining a first route voltage and a second route voltage at the input side of the three-phase power supply through a voltage transformer, and calculating a third route voltage according to the first route voltage and the second route voltage;

[0009] The first route, the second route and the third route voltages can be further calculated based on the obtained first route voltage, the second route voltage and the third route voltage, and then the reconstructed q-axis voltage component and the d-axis voltage component are obtained by synthesizing them through Clark transformation and Park transformation;

[0010] A phase-locked loop is constructed, and a q-axis component voltage is input into the phase-locked loop for negative feedback calculation to obtain a three-phase power supply phase angle and a d-axis voltage component, and the phase of the three-phase power supply is adjusted and locked according to the obtained three-phase power supply phase angle and d-axis voltage component;

[0011] The waveform of the d-axis voltage component is simulated according to the voltage phase angle and the d-axis voltage component, and the three-phase power input phase loss judgment is performed according to the difference between the upper envelope and the lower envelope in the waveform.

[0012] Further, the method of obtaining a first route voltage and a second route voltage at the input side of the three-phase power supply through a voltage transformer, and calculating a third route voltage according to the first route voltage and the second route voltage, specifically includes:

[0013] Cut off the C-phase input of the three-phase power supply, and use a voltage transformer to obtain the first line voltage and the second line voltage on the input side of the three-phase power supply;

[0014] The third line voltage is obtained by converting the first line voltage and the second line voltage using Kirchhoff's law.

[0015] Furthermore, the construction of a phase-locked loop, by inputting the q-axis component voltage into the phase-locked loop for negative feedback calculation to obtain the three-phase power supply phase angle and the d-axis voltage component, and adjusting and locking the phase of the three-phase power supply according to the obtained three-phase power supply phase angle and the d-axis voltage component, specifically includes:

[0016] The q-axis voltage component is input into a phase-locked loop for negative feedback to obtain the q-axis voltage component amplification result;

[0017] Whether phase locking is achieved is determined based on the numerical value of the q-axis voltage component amplification result, and when the q-axis voltage component amplification result is 0, the phase angle of the three-phase power supply voltage can achieve phase locking.

[0018] Furthermore, the determination of whether phase locking is achieved is performed based on the numerical value of the q-axis voltage component amplification result, wherein the determination method is:

[0019] The phase angle of the three-phase power supply voltage can achieve a phase-locked state, that is, the amplification result of the q-axis voltage component is 0;

[0020] When the amplification result of the q-axis voltage component is greater than 0, the three-phase power supply voltage vector leads the d-axis voltage vector. In the current state, the voltage frequency of the three-phase power supply needs to be increased;

[0021] When the amplified result of the q-axis voltage component is less than 0, the three-phase power supply voltage vector lags behind the d-axis voltage vector. In the current state, the voltage frequency of the three-phase power supply needs to be reduced.

[0022] Further, the waveform diagram of the d-axis voltage component is simulated according to the voltage phase angle and the d-axis voltage component, and the three-phase power input phase loss judgment is performed according to the difference between the upper envelope and the lower envelope in the waveform diagram, specifically including:

[0023] The waveform diagram of the d-axis voltage component is simulated according to the voltage phase angle and the d-axis voltage component;

[0024] When the difference between the upper envelope and the lower envelope in the waveform is 0, the three-phase power input is not missing a phase;

[0025] When the difference between the upper envelope and the lower envelope in the waveform is not 0, the three-phase power input is missing a phase.

[0026] As a second aspect of the present application, a three-phase power input phase loss detection device for a three-phase Vienna circuit is provided, comprising:

[0027] A sampling module, the sampling module is used to obtain a first route voltage and a second route voltage at the input side of the three-phase power supply through a voltage transformer, and calculate a third route voltage according to the first route voltage and the second route voltage;

[0028] A three-phase reconstruction module, wherein the voltage reconstruction module is used to calculate the corresponding first route phase voltage, second route phase voltage and third route phase voltage according to the obtained first route voltage, second route voltage and third route voltage, and to synthesize the obtained first route phase voltage, second route phase voltage and third route phase voltage through C l ark and Park transformation to obtain the reconstructed q-axis voltage component and d-axis voltage component;

[0029] A phase locking module, wherein the phase locking module is used to construct a phase-locked loop, input the q-axis component voltage into the phase-locked loop for negative feedback calculation to obtain the three-phase power supply phase angle and the d-axis voltage component, and adjust and lock the phase of the three-phase power supply according to the obtained three-phase power supply phase angle and the d-axis voltage component;

[0030] The phase loss judgment module is used to simulate the waveform of the d-axis voltage component according to the voltage phase angle and the d-axis voltage component, and to judge the phase loss of the three-phase power input according to the difference between the upper envelope and the lower envelope in the waveform.

[0031] Furthermore, the sampling module includes:

[0032] A sampling unit, the sampling unit is used to cut off the C-phase input of the three-phase power supply, and obtain the first line voltage and the second line voltage at the input side of the three-phase power supply by using a voltage transformer;

[0033] A first calculation unit is used for converting the first line voltage and the second line voltage using Kirchhoff's law to obtain a third line voltage.

[0034] Furthermore, the phase locking module includes:

[0035] a second calculation unit, the second calculation unit being used to obtain a q-axis voltage component amplification result by inputting the q-axis voltage component into a phase-locked loop for negative feedback;

[0036] The judging unit judges whether phase locking is achieved according to the numerical value of the amplified result of the q-axis voltage component, and when the amplified result of the q-axis voltage component is 0, the phase angle of the three-phase power supply voltage can achieve phase locking.

[0037] As the third aspect of the present application, a three-phase power input phase loss detection system for a three-phase Vienna circuit is provided, comprising a memory and one or more processors; the memory is used to store one or more programs; when the one or more programs are executed by the one or more processors, the one or more processors implement the phase loss judgment method as described above.

[0038] For better understanding and implementation, the present invention is described in detail below with reference to the accompanying drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0039] Figure 1 It is a circuit principle block diagram based on a three-phase Vienna circuit in the prior art;

[0040] Figure 2 is a flow chart of a three-phase power input phase loss detection method in this embodiment;

[0041] Figure 3 is a control principle block diagram of the three-phase power input phase loss detection method in this embodiment;

[0042] Figure 4 is a Vd waveform diagram when three-phase is missing after detection, to which the three-phase power input missing phase detection method in this embodiment is applied;

[0043] Figure 5 is a structural block diagram of a three-phase power input phase loss detection device in this embodiment;

[0044] Figure 6 is a structural block diagram of an indication sampling module in a three-phase power input phase loss detection device in this embodiment;

[0045] Figure 7 It is a structural block diagram of the phase locking module indicating the phase in the three-phase power input phase loss detection device in this embodiment.

[0046] Figure 8is a structural diagram of the three-phase power input detection system in this embodiment. DETAILED DESCRIPTION

[0047] In order to better illustrate the present invention, the present invention is further described in detail below with reference to the accompanying drawings.

[0048] It should be clear that the described embodiments are only part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the embodiments of the present application.

[0049] The terms used in the embodiments of the present application are only for the purpose of describing specific embodiments, and are not intended to limit the embodiments of the present application. The singular forms of "a", "said" and "the" used in the embodiments of the present application and the appended claims are also intended to include plural forms, unless the context clearly indicates other meanings. It should also be understood that the term "and / or" used herein refers to and includes any or all possible combinations of one or more associated listed items.

[0050] When the following description refers to the drawings, unless otherwise indicated, the same numbers in different drawings represent the same or similar elements. The embodiments described in the following exemplary embodiments do not represent all embodiments consistent with the present application. On the contrary, they are merely examples of devices and methods consistent with some aspects of the present application as detailed in the attached claims. In the description of the present application, it should be understood that the terms "first", "second", "third", etc. are only used to distinguish similar objects, and do not have to be used to describe a specific order or sequence, nor can they be understood as indicating or implying relative importance. For those of ordinary skill in the art, the specific meanings of the above terms in the present application can be understood according to the specific circumstances.

[0051] In addition, in the description of this application, unless otherwise specified, "plurality" means two or more. "And / or" describes the association relationship of associated objects, indicating that three relationships may exist. For example, A and / or B can mean: A exists alone, A and B exist at the same time, and B exists alone. The character " / " generally indicates that the associated objects are in an "or" relationship.

[0052] As an illustrative example in this application, Figure 1 As shown, a method for detecting phase loss of a three-phase power input of a three-phase Vienna circuit is provided, comprising the following steps:

[0053] Step S1: obtaining a first route voltage and a second route voltage at the input side of a three-phase power supply through a voltage transformer, and calculating a third route voltage according to the first route voltage and the second route voltage;

[0054] Step S2: Calculate the corresponding first route phase voltage, second route phase voltage and third route phase voltage according to the obtained first route voltage, second route voltage and third route voltage, and synthesize the obtained first route phase voltage, second route phase voltage and third route phase voltage through C l ark and Park transformation to obtain the reconstructed q-axis voltage component and d-axis voltage component;

[0055] In the above embodiment, the first route voltage and the second route voltage at the input side of the three-phase power supply are firstly obtained by a voltage transformer, and then the third route voltage is calculated by a processor according to the obtained first route voltage and second route voltage, wherein the calculation method involved is as follows:

[0056] Since three-phase three-wire input is used in three-phase Vienna circuit topology applications, the phase voltage cannot be measured directly. The subsequent phase voltage conversion can be performed by measuring the voltage. In this process, the power input of phase C needs to be cut off to avoid interference with the calculation results.

[0057] According to Kirchhoff's voltage law, we only need to measure the voltage between two lines to calculate the voltage between the third line, as follows:

[0058] Van+Vbn+Vcn=0;

[0059] Vab=Van-Vbn;

[0060] Vbc=Vbn-Vcn;

[0061] Vca=Vcn-Van;

[0062] Then the formula for converting line voltage to phase voltage is derived:

[0063] Van=(Vab-Vca) / 3;

[0064] Vbn=(Vbc-Vab) / 3;

[0065] Vcn=(Vca-Vbc) / 3;

[0066] Based on the above, the corresponding first phase voltage, second phase voltage and third phase voltage are calculated.

[0067] In addition, the first route voltage, the second route voltage and the third route voltage are reconstructed through Clark transformation and Park transformation to obtain q-axis voltage component and d-axis voltage component. Since this solution involves equal amplitude transformation, according to the transformation formula:

[0068]

[0069] The P value in the formula is 3 / 2 based on the data test.

[0070] Step S3: construct a phase-locked loop, input the q-axis component voltage into the phase-locked loop for negative feedback calculation to obtain the three-phase power supply phase angle and the d-axis voltage component, and adjust and lock the phase of the three-phase power supply according to the obtained three-phase power supply phase angle and the d-axis voltage component;

[0071] In this embodiment, combined with Figure 3 As shown in the figure, the phase-locked loop is mainly used to lock the phase angle of the grid voltage and complete the tracking of the grid voltage phase angle. The component vq of the voltage vector on the q axis contains the phase information and frequency information of the voltage. Vq reflects the phase relationship between the grid voltage and the d axis: when Vq>0, the voltage vector leads the d axis. If you want to achieve synchronous phase locking, you need to increase the frequency; when Vq<0, the voltage vector v lags the d axis. If you want to achieve synchronous phase locking, you need to reduce the frequency; when Vq=0, the voltage vector is in phase with the d axis. Therefore, phase locking can be achieved with Vq=0 as the control target.

[0072] After obtaining Vq, the grid voltage frequency is obtained through the phase-locked loop regulator, and the grid voltage frequency (Hz) can be obtained after conversion. The frequency is integrated to obtain the grid voltage phase angle θ, and the phase angle is modulo 2π to obtain a grid voltage phase angle in the range of 0 to 2π. The phase angle is substituted into the phase angle required in the park transformation and iterated to iterate the accurate phase angle value in a very short time.

[0073] Step S4: simulate the waveform of the d-axis voltage component according to the voltage phase angle and the d-axis voltage component, and determine the phase loss of the three-phase power input according to the difference between the upper envelope and the lower envelope in the waveform.

[0074] In this embodiment, the waveform diagram of the d-axis voltage component is simulated according to the voltage phase angle and the d-axis voltage component to determine whether the three-phase power input is missing a phase;

[0075] like Figure 4 As shown in the figure, according to the waveform of Vd, the adjacent peaks and valleys are connected as the upper and lower envelopes of Vd. When the three-phase power input is normal, Vd can be considered as a DC quantity, and the difference between the upper and lower envelopes is 0; when the three phases are missing, Vd is a sine wave with a frequency twice the frequency of the three-phase input power supply; therefore, the difference in the envelope of Vd can be used to judge the phase loss.

[0076] That is, when the difference between the upper envelope and the lower envelope in the waveform is 0, the three-phase power input has no phase loss;

[0077] When the difference between the upper envelope and the lower envelope in the waveform is not 0, the three-phase power input is missing a phase.

[0078] Based on the description in this embodiment, for an application example in this embodiment:

[0079] Established on the principle Figure 2 Circuit and control framework, inductance value La = Lb = Lc = 430uH, C1 = C2 = 820uF, input power phase voltage effective value is 220V, input voltage frequency is 50Hz, R1 = R2 = 10KΩ, RL = 50Ω.

[0080] Cut off the C phase input of the three-phase power supply, and reconstruct Van, Vbn, and Vcn according to the line voltages Vab and Vbc. Figure 5 As shown, the input voltage Vcn drops completely to 0; Van, Vbn, and Vcn undergo Clark transformation and Park transformation, and Vq is input into the phase-locked loop for negative feedback calculation to obtain the grid phase angle and Vd and Vq; Vd presents a sine wave with a frequency of 100 Hz and an amplitude of 260, as shown Figure 6 As shown in the figure, by extracting the upper and lower envelopes of Vd and performing difference calculation, it is possible to determine whether the three-phase power input is missing a phase, and the judgment time is less than 0.1S;

[0081] like Figure 4 Indicates that the three-phase power currently input is missing a phase.

[0082] As two aspects of this embodiment, Figure 5 As shown, a three-phase power input phase loss detection device for a three-phase Vienna circuit is provided, comprising:

[0083] A sampling module, the sampling module is used to obtain a first route voltage and a second route voltage at the input side of the three-phase power supply through a voltage transformer, and calculate a third route voltage according to the first route voltage and the second route voltage;

[0084] A three-phase reconstruction module, wherein the voltage reconstruction module is used to calculate the corresponding first route phase voltage, second route phase voltage and third route phase voltage according to the obtained first route voltage, second route voltage and third route voltage, and to synthesize the obtained first route phase voltage, second route phase voltage and third route phase voltage through C l ark and Park transformation to obtain the reconstructed q-axis voltage component and d-axis voltage component;

[0085] A phase locking module, wherein the phase locking module is used to construct a phase-locked loop, input the q-axis component voltage into the phase-locked loop for negative feedback calculation to obtain the three-phase power supply phase angle and the d-axis voltage component, and adjust and lock the phase of the three-phase power supply according to the obtained three-phase power supply phase angle and the d-axis voltage component;

[0086] The phase loss judgment module is used to simulate the waveform of the d-axis voltage component according to the voltage phase angle and the d-axis voltage component, and to judge the phase loss of the three-phase power input according to the difference between the upper envelope and the lower envelope in the waveform.

[0087] Furthermore, the sampling module includes:

[0088] A sampling unit, the sampling unit is used to cut off the C-phase input of the three-phase power supply, and obtain the first line voltage and the second line voltage at the input side of the three-phase power supply by using a voltage transformer;

[0089] A first calculation unit is used for converting the first line voltage and the second line voltage using Kirchhoff's law to obtain a third line voltage.

[0090] Furthermore, the phase locking module includes:

[0091] a second calculation unit, the second calculation unit being used to obtain a q-axis voltage component amplification result by inputting the q-axis voltage component into a phase-locked loop for negative feedback;

[0092] The judging unit judges whether phase locking is achieved according to the numerical value of the amplified result of the q-axis voltage component, and when the amplified result of the q-axis voltage component is 0, the phase angle of the three-phase power supply voltage can achieve phase locking.

[0093] As the third aspect of this embodiment, a three-phase power input phase loss detection system for a three-phase Vienna circuit is provided, comprising a memory and one or more processors; the memory is used to store one or more programs; when the one or more programs are executed by the one or more processors, the one or more processors implement the phase loss judgment method as described above.

[0094] The phase loss judgment system can be integrated with the phase loss judgment device provided in the embodiment of the present application. Figure 5 Schematic diagram of a phase loss judgment system provided in an embodiment of the present application. Figure 5 The phase failure judgment system includes a memory 52 and one or more processors 51; the memory 52 is used to store one or more programs; when the one or more programs are executed by the one or more processors 51, the one or more processors 51 implement the phase failure judgment method provided in the above embodiment. The memory 52 and the processor 51 of the phase failure judgment system can be connected through a bus or other means. Figure 5 The example of connecting through bus is taken in the following.

[0095] The memory 52, as a computing device readable storage medium, can be used to store software programs, computer executable programs and modules, such as the program instructions / modules corresponding to the phase loss judgment method described in any embodiment of the present application (for example, the single resistor sampling module 401, the three-phase reconstruction module 402, the phase loss judgment module 403 and the compressor start-stop module 404 in the phase loss judgment device). The memory 52 may mainly include a program storage area and a data storage area, wherein the program storage area may store an operating system, an application required for at least one function; the data storage area may store data created according to the use of the device, etc. In addition, the memory 52 may include a high-speed random access memory, and may also include a non-volatile memory, such as at least one disk storage device, a flash memory device, or other non-volatile solid-state storage device. In some instances, the memory 52 may further include a memory remotely arranged relative to the processor 51, and these remote memories may be connected to the device via a network. Examples of the above-mentioned network include, but are not limited to, the Internet, an intranet, a local area network, a mobile communication network and a combination thereof. The processor 51 executes various functional applications and data processing of the device by running the software programs, instructions and modules stored in the memory 52, that is, realizing the above-mentioned phase loss judgment method.

[0096] The above-provided phase loss judgment device and phase loss judgment system can be used to execute the phase loss judgment method provided in the above-mentioned embodiment, and have corresponding functions and beneficial effects. According to the disclosure and teaching of the above-mentioned specification, technicians in the field to which the present invention belongs can also change and modify the above-mentioned implementation mode. Therefore, the present invention is not limited to the specific implementation modes disclosed and described above, and some modifications and changes to the present invention should also fall within the scope of protection of the claims of the present invention. In addition, although some specific terms are used in this specification, these terms are only for the convenience of explanation and do not constitute any limitation to the present invention.

Claims

1. A method for detecting phase loss of a three-phase power input of a three-phase Vienna circuit, characterized in that: include: Obtaining a first route voltage and a second route voltage at the input side of the three-phase power supply through a voltage transformer, and calculating a third route voltage according to the first route voltage and the second route voltage; The first route phase voltage, the second route phase voltage and the third route phase voltage are calculated according to the obtained first route voltage, the second route voltage and the third route voltage, and the reconstructed q-axis voltage component and d-axis voltage component are synthesized by Clark and Park transformation according to the obtained first route phase voltage, the second route phase voltage and the third route phase voltage; A phase-locked loop is constructed, and a q-axis component voltage is input into the phase-locked loop for negative feedback calculation to obtain a three-phase power supply phase angle and a d-axis voltage component, and the phase of the three-phase power supply is adjusted and locked according to the obtained three-phase power supply phase angle and d-axis voltage component; The waveform of the d-axis voltage component is simulated according to the voltage phase angle and the d-axis voltage component, and the three-phase power input phase loss judgment is performed according to the difference between the upper envelope and the lower envelope in the waveform.

2. The three-phase power input missing phase detection method according to claim 1 is characterized in that: The method of obtaining a first route voltage and a second route voltage at the input side of the three-phase power supply through a voltage transformer, and calculating a third route voltage according to the first route voltage and the second route voltage, specifically includes: Cut off the C-phase input of the three-phase power supply, and use a voltage transformer to obtain the first line voltage and the second line voltage on the input side of the three-phase power supply; The third line voltage is obtained by converting the first line voltage and the second line voltage using Kirchhoff's law.

3. The three-phase power input missing phase detection method according to claim 1, characterized in that: The phase-locked loop is constructed by inputting the q-axis component voltage into the phase-locked loop for negative feedback calculation to obtain the three-phase power supply phase angle and the d-axis voltage component, and the phase of the three-phase power supply is adjusted and locked according to the obtained three-phase power supply phase angle and the d-axis voltage component, specifically including: The q-axis voltage component is input into a phase-locked loop for negative feedback to obtain the q-axis voltage component amplification result; Whether phase locking is achieved is determined based on the numerical value of the q-axis voltage component amplification result, and when the q-axis voltage component amplification result is 0, the phase angle of the three-phase power supply voltage can achieve phase locking.

4. The three-phase power input missing phase detection method according to claim 3 is characterized in that: The determination of whether phase locking is achieved is performed based on the numerical value of the amplified result of the q-axis voltage component, wherein the determination method is: The phase angle of the three-phase power supply voltage can achieve a phase-locked state, that is, the amplification result of the q-axis voltage component is 0; When the amplification result of the q-axis voltage component is greater than 0, the three-phase power supply voltage vector leads the d-axis voltage vector. In the current state, the voltage frequency of the three-phase power supply needs to be increased; When the amplified result of the q-axis voltage component is less than 0, the three-phase power supply voltage vector lags behind the d-axis voltage vector. In the current state, the voltage frequency of the three-phase power supply needs to be reduced.

5. The three-phase power input missing phase detection method according to claim 1 is characterized in that The method of simulating the waveform of the d-axis voltage component according to the voltage phase angle and the d-axis voltage component and judging the phase loss of the three-phase power input according to the difference between the upper envelope and the lower envelope in the waveform includes: The waveform diagram of the d-axis voltage component is simulated according to the voltage phase angle and the d-axis voltage component; When the difference between the upper envelope and the lower envelope in the waveform diagram is 0, the three-phase power input is not missing a phase; when the difference between the upper envelope and the lower envelope in the waveform diagram is not 0, the three-phase power input is missing a phase.

6. A three-phase power input phase loss detection device for a three-phase Vienna circuit, characterized in that: include: A sampling module, the sampling module is used to obtain a first route voltage and a second route voltage at the input side of the three-phase power supply through a voltage transformer, and calculate a third route voltage according to the first route voltage and the second route voltage; A three-phase reconstruction module, wherein the voltage reconstruction module is used to calculate the first, second and third phase voltages according to the obtained first route voltage, second route voltage and third route voltage, and to synthesize the obtained first phase voltage, second phase voltage and third phase voltage through Clark and Park transformation to obtain the reconstructed q-axis voltage component and d-axis voltage component; A phase locking module, wherein the phase locking module is used to construct a phase-locked loop, input the q-axis component voltage into the phase-locked loop for negative feedback calculation to obtain the three-phase power supply phase angle and the d-axis voltage component, and adjust and lock the phase of the three-phase power supply according to the obtained three-phase power supply phase angle and the d-axis voltage component; The phase loss judgment module is used to simulate the waveform of the d-axis voltage component according to the voltage phase angle and the d-axis voltage component, and to judge the phase loss of the three-phase power input according to the difference between the upper envelope and the lower envelope in the waveform.

7. A three-phase power input phase loss detection device for a three-phase Vienna circuit according to claim 6, characterized in that: The sampling module comprises: A sampling unit, the sampling unit is used to cut off the C-phase input of the three-phase power supply, and obtain the first line voltage and the second line voltage at the input side of the three-phase power supply by using a voltage transformer; A first calculation unit is used for converting the first line voltage and the second line voltage using Kirchhoff's law to obtain a third line voltage.

8. The three-phase power input missing phase detection device of a three-phase Vienna circuit according to claim 6, characterized in that: The phase locking module comprises: a second calculation unit, the second calculation unit being used to obtain a q-axis voltage component amplification result by inputting the q-axis voltage component into a phase-locked loop for negative feedback; The judging unit judges whether phase locking is achieved according to the numerical value of the amplified result of the q-axis voltage component, and when the amplified result of the q-axis voltage component is 0, the phase angle of the three-phase power supply voltage can achieve phase locking.

9. A three-phase power input phase loss detection system for a three-phase Vienna circuit, characterized in that: including a memory and one or more processors; The memory is used to store one or more programs; When the one or more programs are executed by the one or more processors, the one or more processors implement the phase loss judgment method as described in any one of claims 1 to 5.

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