Reverse phase detection method, apparatus, system, device, and storage medium

Abstract

This application relates to a method, apparatus, system, device, and storage medium for reverse phase detection. It pertains to the field of high-end equipment manufacturing technology, particularly compressor technology. When a three-phase compressor is powered on and stationary, a high-frequency voltage signal is injected, and the three-phase high-frequency current is detected. The phase difference between any two phases, combined with the compressor temperature, is used to pre-determine whether there is an abnormality in the phase sequence. After preliminary determination of an abnormality, the compressor is started at low speed, and the rotor angular velocity is detected for secondary verification, ultimately confirming the reverse phase detection result. This application differs from the traditional "power-off shutdown" method of phase sequence protectors by employing a two-stage detection strategy of "active identification before startup + low-speed verification after startup." This achieves accurate identification of the reverse phase state of a three-phase compressor without relying on additional hardware protectors. It can better prevent the compressor motor from reversing due to reverse phase, thus better avoiding abnormal system pressure, equipment damage, and even safety accidents, thereby improving the safety of compressor operation.

Description

Technical Field

[0001] This application relates to the field of compressor technology, and in particular to a method, apparatus, system, device and storage medium for detecting reverse phase. Background Technology

[0002] In industrial and commercial refrigeration equipment such as central air conditioning, chillers, and heat pump systems, multiple compressors are often operated in parallel to achieve load regulation and redundancy backup. The compressors are typically driven by frequency converters, and their motors are mostly permanent magnet synchronous motors (PMSMs), which have the advantages of high efficiency and high power density. However, during installation, maintenance, or wiring replacement, it is very easy for the three-phase power lines (U / V / W) to be reversed (i.e., reverse phase), causing the motor to reverse.

[0003] During the operation of a three-phase compressor, the phase sequence of the three-phase current input directly affects the compressor's rotation direction. If the three-phase current is reversed, the compressor motor will reverse, which may lead to abnormal system pressure, equipment damage, or even a safety accident. Summary of the Invention

[0004] In view of this, in order to solve the technical problem in the prior art that if the three-phase current reverses during the operation of a three-phase compressor, the compressor motor will reverse, which may lead to abnormal system pressure, equipment damage or even safety accidents, this application provides a reverse phase detection method, device, system, equipment and storage medium.

[0005] According to a first aspect of the embodiments of this application, a method for detecting reverse phase in a three-phase compressor is provided, the method comprising: After the three-phase compressor is powered on and in a static state, a high-frequency voltage signal is injected into the three-phase compressor to detect the three-phase high-frequency current signal of the three-phase compressor. Based on the three-phase high-frequency current signal, at least two two-phase phase differences among the three phases are determined; Based on the compressor temperature of the three-phase compressor and at least two phase differences between the two phases, determine whether there is a phase sequence abnormality in the three-phase compressor; If it is determined that there is a phase sequence abnormality in the three-phase compressor, the three-phase compressor is controlled to start at low speed, and the rotor angular velocity of the three-phase compressor is detected. Based on the rotor angular velocity, the reverse phase detection result of the three-phase compressor is determined.

[0006] In one alternative implementation, The determination of whether there is a phase sequence abnormality in the three-phase compressor based on the compressor temperature of the three-phase compressor and at least two phase differences between the two phases includes: If the compressor temperature is greater than or equal to a first temperature threshold and less than or equal to a second temperature threshold, and if it is determined that the difference between at least one of the phase differences of the two phases and the target phase difference is greater than the first difference threshold, then the phase sequence of the three-phase compressor is determined to be abnormal.

[0007] In one alternative implementation, The determination of whether there is a phase sequence abnormality in the three-phase compressor based on the compressor temperature of the three-phase compressor and at least two phase differences between the two phases includes: If the compressor temperature is greater than or equal to a first temperature threshold and less than or equal to a second temperature threshold, and if it is determined that the difference between at least two phase differences between the two phases and the target phase difference is less than or equal to the first difference threshold, then the phase sequence of the three-phase compressor is determined to be normal.

[0008] In one alternative implementation, The determination of whether there is a phase sequence abnormality in the three-phase compressor based on the compressor temperature of the three-phase compressor and at least two phase differences between the two phases includes: If the compressor temperature is greater than or equal to a third temperature threshold, and if it is determined that the difference between at least one of the phase differences between two phases and the target phase difference is greater than a second difference threshold, then the phase sequence of the three-phase compressor is determined to be abnormal; wherein the third temperature threshold is greater than the second temperature threshold, and the second difference threshold is greater than the first difference threshold.

[0009] In one alternative implementation, The determination of whether there is a phase sequence abnormality in the three-phase compressor based on the compressor temperature of the three-phase compressor and at least two phase differences between the two phases includes: If the compressor temperature is greater than or equal to the third temperature threshold, and if it is determined that the difference between at least two phase differences and the target phase difference is greater than the second difference threshold, then the phase sequence of the three-phase compressor is determined to be normal.

[0010] In one alternative implementation, The determination of whether there is a phase sequence abnormality in the three-phase compressor based on the compressor temperature of the three-phase compressor and at least two phase differences between the two phases includes: If the compressor temperature is less than or equal to a fourth temperature threshold, and if it is determined that the difference between at least one of the phase differences between two phases and the target phase difference is greater than a third difference threshold, then the phase sequence of the three-phase compressor is determined to be abnormal; wherein the fourth temperature threshold is less than the first temperature threshold, and the third difference threshold is greater than the second difference threshold.

[0011] In one alternative implementation, The determination of whether there is a phase sequence abnormality in the three-phase compressor based on the compressor temperature of the three-phase compressor and at least two phase differences between the two phases includes: If the compressor temperature is less than or equal to the fourth temperature threshold, and if it is determined that the difference between at least two phase differences and the target phase difference is less than or equal to the third difference threshold, then the phase sequence of the three-phase compressor is determined to be normal.

[0012] In one alternative implementation, The determination of the reverse phase detection result of the three-phase compressor based on the rotor angular velocity includes: If the rotor angular velocity is less than or equal to zero, then the three-phase compressor is determined to have a reverse phase.

[0013] In one alternative implementation, The determination of the reverse phase detection result of the three-phase compressor based on the rotor angular velocity includes: If the rotor angular velocity is greater than zero, then the phase sequence of the three-phase compressor is determined to be normal.

[0014] In one alternative implementation, The frequency of the high-frequency voltage signal is greater than or equal to 500 Hz and less than or equal to 2 kHz.

[0015] In one alternative implementation, The reverse phase detection method includes: If it is determined that the three-phase compressor has a reverse phase, the three-phase compressor is subjected to a phase commutation process.

[0016] In one alternative implementation, The commutation process for the three-phase compressor includes: Detect the three-phase current of the three-phase compressor; The phase sequence corresponding to the maximum current among the three phase currents is determined as the target phase sequence; The two phases of the three-phase compressor other than the target phase sequence are subjected to phase commutation.

[0017] In one alternative implementation, After performing phase commutation on the three-phase compressor, the reverse phase detection method includes: If the rotor angular velocity is determined to be greater than zero and the duration reaches the set duration, then the commutation of the three-phase compressor is determined to be successful, and the three-phase compressor is controlled to continue running.

[0018] In one alternative implementation, After performing phase commutation on the three-phase compressor, the reverse phase detection method includes: If the rotor angular velocity is determined to be less than or equal to zero, then the commutation of the three-phase compressor is determined to have failed. If the number of commutation failures is less than the set number, return to the step of injecting a high-frequency voltage signal into the three-phase compressor.

[0019] In one alternative implementation, After determining that the commutation of the three-phase compressor has failed, the reverse phase detection method includes: If the number of commutation failures is greater than or equal to the set number, the three-phase compressor is controlled to stop and an alarm message is issued.

[0020] According to a second aspect of the embodiments of this application, a phase inversion detection device is provided, the phase inversion detection device comprising: The detection module is used to inject a high-frequency voltage signal into the three-phase compressor after it is powered on and in a static state, so as to detect the three-phase high-frequency current signal of the three-phase compressor. The determination module is used to determine at least two two-phase phase differences among the three-phase phases based on the three-phase high-frequency current signals. The determining module is further configured to determine whether there is a phase sequence abnormality in the three-phase compressor based on the compressor temperature of the three-phase compressor and at least two phase differences between the two phases; The detection module is also used to control the three-phase compressor to start at low speed and detect the rotor angular velocity of the three-phase compressor when it is determined that there is a phase sequence error in the three-phase compressor. The determining module is also used to determine the reverse phase detection result of the three-phase compressor based on the rotor angular velocity.

[0021] According to a third aspect of the embodiments of this application, a reverse phase detection system is provided, the reverse phase detection system being used to implement the reverse phase detection method as described in any of the first aspects.

[0022] According to a fourth aspect of the embodiments of this application, an apparatus is provided, the apparatus including a three-phase compressor, and further including: a processor and a memory, the processor being configured to execute a control program stored in the memory to implement the reverse phase detection method as described in any of the first aspects.

[0023] According to a fifth aspect of the embodiments of this application, a storage medium is provided, the storage medium storing one or more programs, the one or more programs being executable by one or more processors to implement the inverse detection method as described in any of the first aspects.

[0024] The technical solution provided by the embodiments of this application can include the following beneficial effects: In this application, after the three-phase compressor is powered on and in a stationary state, a high-frequency voltage signal is injected and the three-phase high-frequency current is detected. The phase difference between any two phases, combined with the compressor temperature, is used to pre-determine whether there is an abnormality in the phase sequence. After the initial determination of the abnormality, the compressor is started at low speed and a secondary verification is performed by detecting the rotor angular velocity, ultimately confirming the reverse phase detection result. Compared to traditional phase sequence protectors that can only passively shut down when reverse rotation occurs, this application uses a high-frequency injection method to complete the determination of phase sequence abnormalities in the stationary state after the compressor is powered on, thus avoiding physical damage and system safety accidents caused by compressor reverse rotation from the source. Moreover, after the initial determination of the abnormality, this application does not immediately determine the existence of reverse phase, but controls the compressor to start at low speed and performs a secondary verification by detecting the rotor angular velocity. Only when the phase difference judgment and the angular velocity direction are mutually confirmed is the reverse phase detection result confirmed, avoiding unnecessary shutdowns due to single detection errors. In addition, this application does not require additional hardware such as phase sequence protectors, reducing system complexity and modification costs. In other words, this application differs from the traditional "power-off shutdown" method of phase sequence protectors by adopting a two-stage detection strategy of "active identification before startup + low-speed verification after startup". This enables accurate identification of the reverse phase state of a three-phase compressor without relying on additional hardware protectors. This can better prevent the compressor motor from reversing due to reverse phase, and can better prevent abnormal system pressure, equipment damage, or even safety accidents, thereby improving the safety of compressor use.

[0025] It should be understood that the above general description and the following detailed description are exemplary and explanatory only, and do not limit this application. Attached Figure Description

[0026] The accompanying drawings, which are incorporated in and form part of this specification, illustrate embodiments consistent with the invention and, together with the description, serve to explain the principles of the invention.

[0027] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, those skilled in the art can obtain other drawings based on these drawings without creative effort.

[0028] One or more embodiments are illustrated by way of example with reference numerals in the accompanying drawings. These illustrations do not constitute a limitation on the embodiments. Elements with the same reference numerals in the drawings are denoted as similar elements. Unless otherwise stated, the figures in the drawings are not to be limited by scale.

[0029] Figure 1 This is a schematic diagram illustrating an inverted phase detection method according to an exemplary embodiment.

[0030] Figure 2 This is a schematic diagram illustrating an inverted phase detection method according to another exemplary embodiment.

[0031] Figure 3 This is a circuit diagram illustrating the commutation of a three-phase compressor according to an exemplary embodiment.

[0032] Figure 4 This is a block diagram illustrating an inverted phase detection device according to an exemplary embodiment.

[0033] Figure 5 This is a block diagram of a device according to an exemplary embodiment. Detailed Implementation

[0034] To make the objectives, technical solutions, and advantages of the embodiments of this application clearer, 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, not all embodiments. Based on the embodiments of this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0035] The following disclosure provides numerous different embodiments or examples for implementing various aspects of the invention. To simplify the disclosure, specific examples of components and arrangements are described below. These are merely examples and are not intended to limit the scope of the invention. Furthermore, reference numerals and / or letters may be repeated in different examples. Such repetition is for simplification and clarity and does not in itself indicate a relationship between the various embodiments and / or arrangements discussed.

[0036] For ease of description, spatial relative terms may be used in the text to describe the relative position or movement of one element or feature relative to another element or feature, as shown in the figure. These relative terms include, for example, "inside," "outside," "middle," "outer," "below," "below," "above," "front," "back," etc. Such spatial relative terms are intended to include different orientations of the device in use or operation, other than those depicted in the figure. For example, if the device in the figure undergoes a positional flip, orientation change, or change of motion, these directional indications will change accordingly. For instance, an element described as "below other elements or features" or "below other elements or features" will subsequently be oriented "above other elements or features" or "above other elements or features." Therefore, the example term "below" can include both upper and lower orientations. The device may be otherwise oriented (rotated 90 degrees or in other directions), and the spatial relative descriptors used in the text will be interpreted accordingly.

[0037] It should be noted that the illustrations provided in the following embodiments are only schematic representations of the basic concept of this application. Therefore, the drawings only show the components related to this application and are not drawn according to the actual number, shape and size of the components in the actual implementation. In the actual implementation, the form, quantity and proportion of each component can be arbitrarily changed, and the layout of the components may also be more complex.

[0038] The embodiments of this application will be described below with reference to the accompanying drawings and preferred embodiments. Those skilled in the art can easily understand other advantages and effects of this application from the content disclosed in this specification. This application can also be implemented or applied through other different specific embodiments, and various details in this specification can also be modified or changed based on different viewpoints and applications without departing from the spirit of this application. It should be understood that the preferred embodiments are only for illustrating this application and are not intended to limit the scope of protection of this application.

[0039] In order to solve the technical problem in the prior art that if the three-phase current reverses during the operation of a three-phase compressor, the compressor motor will reverse, which may lead to abnormal system pressure, equipment damage or even safety accidents, this application provides a reverse phase detection method, device, system, equipment and storage medium.

[0040] In this application, after the compressor is powered on and in a stationary state, a high-frequency voltage signal is injected and the three-phase high-frequency current is detected. The phase difference between any two phases, combined with the compressor temperature, is used to pre-determine whether there is an abnormality in the phase sequence. After the initial determination of an abnormality, the compressor is started at low speed and the rotor angular velocity is detected for secondary verification, ultimately confirming the reverse phase detection result. Compared to traditional phase sequence protectors that can only passively shut down when reverse rotation occurs, this application uses a high-frequency injection method to determine phase sequence abnormalities while the compressor is powered on and stationary, thus preventing physical damage and system safety accidents caused by compressor reverse rotation from the source. Moreover, this application does not immediately determine the existence of reverse phase after the initial determination of an abnormality. Instead, it controls the compressor to start at low speed and performs secondary verification using rotor angular velocity. Only when the phase difference judgment and the angular velocity direction are mutually confirmed is the reverse phase detection result confirmed, avoiding unnecessary shutdowns due to single detection errors. Furthermore, this application does not require additional hardware such as phase sequence protectors, reducing system complexity and modification costs. In other words, this application differs from the traditional "power-off shutdown" method of phase sequence protectors by adopting a two-stage detection strategy of "active identification before startup + low-speed verification after startup". This enables accurate identification of the reverse phase state of a three-phase compressor without relying on additional hardware protectors. This can better prevent the compressor motor from reversing due to reverse phase, and can better prevent abnormal system pressure, equipment damage, or even safety accidents, thereby improving the safety of compressor use.

[0041] In one exemplary embodiment, reference Figure 1 and Figure 3 As shown, a method for detecting reverse phase of a three-phase compressor is provided, which can be applied to equipment equipped with a three-phase compressor, such as industrial and commercial refrigeration equipment such as central air conditioning, chiller units, and heat pump systems, or other equipment equipped with a three-phase compressor, without limitation.

[0042] The reverse phase detection method may include: S110. After the three-phase compressor is powered on and in a static state, inject a high-frequency voltage signal into the three-phase compressor to detect the three-phase high-frequency current signal of the three-phase compressor. S120. Based on the three-phase high-frequency current signal, determine the phase difference between any two phases in the three-phase phase; S130. Based on the compressor temperature of the three-phase compressor and the phase difference between the two two-phase phases, determine whether there is a phase sequence abnormality in the three-phase compressor; S140. If it is determined that there is a phase sequence error in the three-phase compressor, control the three-phase compressor to start at low speed and detect the rotor angular velocity of the three-phase compressor. S150. Based on the rotor angular velocity, determine the reverse phase detection result of the three-phase compressor.

[0043] In step S110, a three-phase compressor refers to a compressor driven by three-phase alternating current (e.g., 380V / 50Hz), meaning the motor in the compressor has a three-phase input power supply. The normal phase sequence of a three-phase compressor is typically U, V, W, and the electrical angle difference between the three phases is 120°, meaning any two phases have a phase difference of 120°. The motor of the three-phase compressor can be a permanent magnet synchronous motor (PMSM) or other types of motors; there are no restrictions on this.

[0044] In this step, after the three-phase compressor is powered on, in its stationary state, a high-frequency voltage signal can be injected into the three-phase stator windings (U, V, W) of the three-phase compressor, and then the three-phase high-frequency current signal can be collected through the current sensor.

[0045] It should be noted that the high-frequency voltage signal can be set according to actual needs, and its specific frequency is not limited. For example, the frequency of the high-frequency voltage signal can be greater than or equal to 500 Hz and less than or equal to 2 kHz.

[0046] In step S120, after detecting the three-phase high-frequency current signal, the three-phase high-frequency current signal can be processed to obtain the initial phase angles of the three-phase high-frequency current. For example, the three-phase high-frequency current signal can be processed by Fast Fourier Transform (FFT) to obtain the initial phase angles of the three-phase high-frequency current, denoted as […]. U、 V and W, of which U is the initial phase angle corresponding to U. V is the initial phase angle corresponding to V. W is the initial phase angle corresponding to W.

[0047] After obtaining the corresponding initial phase angles, the phase difference between any two phases can be calculated. The phase difference between phase U and phase V is denoted as Δ. The phase difference between phases V and W is denoted as Δ. VW, the phase difference between phase W and phase U is denoted as Δ. WU. It should be noted that, considering that this embodiment can achieve inverse phase detection using at least two two-phase phase differences, this step can only calculate two two-phase phase differences, for example, Δ UV and Δ VW; or, Δ UV and Δ WU; or, Δ VW and Δ WU. Of course, in this step, the phase difference between any two phases can also be calculated, that is, three phase differences between two phases are calculated, namely Δ UV, Δ VW and WU.

[0048] In step S130, it should be noted that, considering the mechanical and electrical characteristics of the three-phase compressor are affected by temperature, with lower temperatures having a greater impact, this embodiment makes different judgments on the phase difference between the two phases based on different temperatures to better confirm the phase sequence of the three-phase compressor. For example, different temperature ranges of the compressor can correspond to different reasonable fluctuation ranges of the phase difference between the two phases.

[0049] In this step, the compressor temperature of the three-phase compressor can be detected by a temperature sensor. Then, based on the compressor temperature and at least two previously determined two-phase phase differences, it is determined whether there is a phase sequence abnormality in the three-phase compressor.

[0050] Specifically, if the compressor temperature is greater than or equal to the first temperature threshold and less than or equal to the second temperature threshold, and it is determined that the difference between at least one two-phase phase difference and the target phase difference is greater than the first difference threshold, then the three-phase compressor phase sequence is determined to be abnormal.

[0051] It should be noted that the first and second temperature thresholds can be set according to actual conditions, and their specific temperatures are not limited. For example, if the normal operating temperature range of the three-phase compressor is 0°C to 40°C, then the first temperature threshold can be 0°C, and the second temperature threshold can be 40°C. Furthermore, since the normal phase sequence of a three-phase compressor is typically defined as U, V, W, and the phase difference between any two phases is 120°, the target phase difference in this embodiment can be 120°. Since the compressor temperature is within the range of the first and second temperature thresholds when it is in a normal state, the first difference threshold in this case can be set relatively small, for example, 10°C.

[0052] Specifically, if the compressor temperature is greater than or equal to the third temperature threshold, and it is determined that the difference between at least one of the phase differences between the two phases and the target phase difference is greater than the second difference threshold, then the three-phase compressor phase sequence is determined to be abnormal.

[0053] It should be noted that the third temperature threshold is used to determine whether the three-phase compressor is operating at a high temperature. That is, if the compressor temperature is greater than or equal to the third temperature threshold, it indicates that the three-phase compressor is operating at a high temperature. The third temperature threshold can be greater than the second temperature threshold, and its specific value can be set according to actual conditions; there is no limitation on its exact value. For example, when the second temperature threshold is 40°C, the third temperature threshold can be 50°C. Furthermore, considering that the three-phase compressor is operating at a high temperature, the deviation between the phase difference of the two phases and the target phase difference can be relaxed; that is, the second difference threshold can be greater than the first difference threshold. The specific value of the second difference threshold can be set according to actual conditions; there is no limitation on its exact value. For example, when the first difference threshold is 10°, the second difference threshold can be 15°.

[0054] Wherein, if the compressor temperature is less than or equal to the fourth temperature threshold, and if it is determined that the difference between at least one of the phase differences between the two phases and the target phase difference is greater than the third difference threshold, then the phase sequence of the three-phase compressor is determined to be abnormal.

[0055] It should be noted that the fourth temperature threshold is used to determine whether the three-phase compressor is in an ultra-low temperature state. That is, if the compressor temperature is less than or equal to the fourth temperature threshold, it indicates that the three-phase compressor is operating in an ultra-low temperature state. The fourth temperature threshold can be less than the first temperature threshold, and its specific value can be set according to actual conditions; there is no limitation on its specific value. For example, when the first temperature threshold is 0°C, the fourth temperature threshold can be -20°C. Furthermore, considering that the three-phase compressor is in an ultra-low temperature state, the deviation between the phase difference of the two phases and the target phase difference can be further relaxed; that is, the third difference threshold can be greater than the second difference threshold. The specific value of the third difference threshold can be set according to actual conditions; there is no limitation on its specific value. For example, when the second difference threshold is 15°, the third difference threshold can be 20°.

[0056] In some implementations... The compressor temperature can be denoted as T, the target phase difference is 120°, and this implementation uses Δ UV and Δ VW uses two two-phase phase differences to determine phase sequence abnormalities. In this implementation, when 0℃≤T≤40℃, the compressor temperature is considered to be in a normal state, so when Δ The difference between UV and 120° (the difference here refers to Δ) The difference between the larger of UV and 120° and the smaller of 120° is less than or equal to 10°, and Δ If the difference between VW and 120° is less than or equal to 10°, the phase sequence of the three-phase compressor is considered normal; otherwise, the phase sequence of the three-phase compressor is considered abnormal. When T ≥ 50℃, the compressor temperature is considered to be at a high temperature, and the phase difference judgment threshold is relaxed. Therefore, when Δ The difference between UV and 120° is less than or equal to 15°, and Δ If the difference between VW and 120° is less than or equal to 15°, the phase sequence of the three-phase compressor is considered normal; otherwise, the phase sequence of the three-phase compressor is considered abnormal. When T≤-20℃, the compressor temperature is considered to be in an ultra-low temperature state, and the phase difference judgment threshold is further relaxed. Therefore, when Δ The difference between UV and 120° is less than or equal to 20°, and Δ If the difference between VW and 120° is less than or equal to 20°, the phase sequence of the three-phase compressor is considered normal; otherwise, the phase sequence of the three-phase compressor is considered abnormal.

[0057] In step S140, considering that the high-frequency injection method is essentially an indirect detection method based on the electromagnetic characteristics of the motor, its phase difference measurement results may be offset due to current sampling errors, harmonic interference, motor parameter deviations, or extreme temperature effects, potentially leading to misjudgment. Therefore, in this step, if it is determined that there is a phase sequence abnormality in the three-phase compressor, the three-phase compressor can be started at low speed first, and then the rotor electrical angle θr can be estimated in real time based on the back EMF observer, and then the rotor angular velocity ωr can be calculated.

[0058] It should be noted that low-speed start can refer to starting the compressor at a speed lower than the rated operating speed of the three-phase compressor. For example, a three-phase compressor may start and operate at 5% to 10% of its rated speed.

[0059] In step S150, after obtaining the rotor angular velocity, the three-phase compressor can be finally determined to be in reverse phase based on the rotor angular velocity.

[0060] Specifically, if the rotor angular velocity is less than or equal to zero, it is determined that the three-phase compressor has a reverse phase. If the rotor angular velocity is greater than zero, it is determined that the phase sequence of the three-phase compressor is normal.

[0061] It should be noted that in this embodiment, when determining whether there is a phase sequence abnormality in the three-phase compressor based on the compressor temperature of the three-phase compressor and at least two phase differences between the two phases, if it is determined that there is no phase sequence abnormality in the three-phase compressor, the phase sequence of the three-phase compressor can be directly determined to be normal, and subsequent detection of rotor angular velocity and determination of reverse phase based on rotor angular velocity are no longer required, so as to improve efficiency.

[0062] Wherein, if the compressor temperature is greater than or equal to the first temperature threshold and less than or equal to the second temperature threshold, and if it is determined that the difference between at least two phase differences and the target phase difference is less than or equal to the first difference threshold, then the phase sequence of the three-phase compressor is determined to be normal.

[0063] Wherein, if the compressor temperature is greater than or equal to the third temperature threshold, and if it is determined that the difference between at least two phase differences and the target phase difference is greater than the second difference threshold, then the phase sequence of the three-phase compressor is determined to be normal.

[0064] Wherein, if the compressor temperature is less than or equal to the fourth temperature threshold, and if it is determined that the difference between at least two phase differences and the target phase difference is less than or equal to the third difference threshold, then the phase sequence of the three-phase compressor is determined to be normal.

[0065] In some implementations... The compressor temperature can be denoted as T, the target phase difference is 120°, and this implementation uses Δ UV and Δ VW uses two two-phase phase differences to determine phase sequence abnormalities. In this implementation, when 0℃≤T≤40℃, the compressor temperature is considered to be in a normal state, so when Δ The difference between UV and 120° (the difference here refers to Δ) The difference between the larger of UV and 120° and the smaller of 120° is less than or equal to 10°, and Δ If the difference between VW and 120° is less than or equal to 10°, the phase sequence of the three-phase compressor is considered normal, and the compressor can be controlled to operate normally thereafter. Otherwise, the three-phase compressor is considered to have an abnormal phase sequence. When T ≥ 50℃, the compressor temperature is considered to be at a high temperature, and the phase difference judgment threshold is relaxed. Therefore, when Δ The difference between UV and 120° is less than or equal to 15°, and Δ If the difference between VW and 120° is less than or equal to 15°, the phase sequence of the three-phase compressor is considered normal, and the compressor can be controlled to operate normally thereafter. Otherwise, the three-phase compressor is considered to have an abnormal phase sequence. When T≤-20℃, the compressor temperature is considered to be in an ultra-low temperature state, and the phase difference judgment threshold is further relaxed. Therefore, when Δ The difference between UV and 120° is less than or equal to 20°, and Δ If the difference between VW and 120° is less than or equal to 20°, the three-phase compressor is considered to have a normal phase sequence, and the three-phase compressor can be controlled to operate normally thereafter; otherwise, the three-phase compressor is considered to have an abnormal phase sequence.

[0066] In this implementation, after determining that the three-phase compressor has a phase sequence abnormality, the compressor is first started at a low speed. Then, the rotor electrical angle θr is estimated in real time based on the back EMF observer, and the rotor angular velocity ωr is calculated. If ωr > 0, it is determined to be a misjudgment, meaning the three-phase compressor phase sequence is normal, and the compressor can be controlled to operate normally thereafter. If ωr < 0, the compressor is confirmed to have a true reverse phase sequence, meaning the compressor has a reverse phase.

[0067] It should be noted that related technologies rely on phase sequence protectors to passively shut down the system when reverse rotation occurs, which is a reactive protection measure. This embodiment, however, uses a high-frequency injection method to determine phase sequence anomalies even when the system is stationary after power-on, detecting phase sequence errors in advance and avoiding physical damage to the compressor and system safety accidents caused by reverse rotation. Furthermore, considering that the electrical characteristics of the compressor drift with temperature changes, fixed thresholds are prone to misjudgment under high or ultra-low temperature conditions. This embodiment adapts corresponding difference thresholds to different temperature ranges—10°C at normal temperatures, relaxed to 15°C at high temperatures, and further relaxed to 20°C at ultra-low temperatures—eliminating the influence of temperature on detection accuracy and improving the reliability of phase sequence anomaly detection across all temperature conditions. Additionally, considering that the high-frequency injection method is essentially an indirect detection method, it is susceptible to misjudgments due to factors such as current sampling errors and harmonic interference. In this embodiment, after initially determining the abnormality, the reverse phase is not immediately identified. Instead, the compressor is controlled to start at a low speed and verified by the rotor angular velocity. The reverse phase is only confirmed when the phase difference judgment is mutually verified with ωr<0. If ωr>0, it is determined to be a misjudgment and normal operation is restored. This effectively avoids unnecessary shutdowns caused by single detection errors.

[0068] In this embodiment, after the compressor is powered on and in a stationary state, a high-frequency voltage signal is injected and the three-phase high-frequency current is detected. The phase difference between any two phases, combined with the compressor temperature, is used to pre-determine whether there is an abnormality in the phase sequence. After the initial determination of an abnormality, the compressor is started at low speed and a secondary verification is performed by detecting the rotor angular velocity, ultimately confirming the reverse phase detection result. Compared to traditional phase sequence protectors that can only passively shut down when reverse rotation occurs, this application uses a high-frequency injection method to determine phase sequence abnormalities while the compressor is powered on and stationary, thus preventing physical damage and system safety accidents caused by compressor reverse rotation from the source. Moreover, this application does not immediately determine the existence of reverse phase after the initial determination of an abnormality. Instead, it controls the compressor to start at low speed and performs a secondary verification by detecting the rotor angular velocity. Only when the phase difference judgment and the angular velocity direction are mutually confirmed is the reverse phase detection result confirmed, avoiding unnecessary shutdowns due to single detection errors. Furthermore, this application does not require additional hardware such as a phase sequence protector, reducing system complexity and modification costs. In other words, this application differs from the traditional "power-off shutdown" method of phase sequence protectors by adopting a two-stage detection strategy of "active identification before startup + low-speed verification after startup". This enables accurate identification of the reverse phase state of a three-phase compressor without relying on additional hardware protectors. This can better prevent the compressor motor from reversing due to reverse phase, and can better prevent abnormal system pressure, equipment damage, or even safety accidents, thereby improving the safety of compressor use.

[0069] In one exemplary embodiment, reference Figure 2 and Figure 3 As shown, a method for detecting reverse phase in a three-phase compressor is provided. This method is applicable to equipment equipped with three-phase compressors, such as industrial and commercial refrigeration equipment like central air conditioning systems, chillers, and heat pump systems, or other equipment with three-phase compressors; the specific application is not limited to these. In this embodiment, if the method of the previous embodiment determines that the three-phase compressor has a reverse phase, a phase commutation process can be performed on the three-phase compressor to change the actual operating direction of the compressor motor to forward rotation, thereby allowing the three-phase compressor to operate normally.

[0070] The commutation process for a three-phase compressor may include: S210. Detect the three-phase current of the three-phase compressor; S220. Determine the phase sequence corresponding to the maximum current in the three-phase current as the target phase sequence; S230, perform phase commutation on the two phases of the three-phase compressor other than the target phase sequence.

[0071] In step S210, if it is determined that there is a reverse phase in the three-phase compressor, the three-phase current of the three-phase compressor can be detected by the current sampling circuit, wherein the current of the U phase is denoted as I1, the current of the V phase is denoted as I2, and the current of the W phase is denoted as I3.

[0072] In some implementations... The commutation circuit diagram for a three-phase compressor can be referenced. Figure 3 As shown, the microcontroller unit (MCU) controls the inverter circuit through six PWM (Pulse Width Modulation) waves, thereby enabling the inverter circuit to control the three-phase compressor via a three-phase circuit. R1, R2, and R3 are sampling resistors for each phase, and S1 to S7 are switching devices. In this embodiment, after determining that the three-phase compressor has a reverse phase, the U-phase current I1, V-phase current I2, and W-phase current I3 of the three-phase compressor can be detected through the sampling resistors R1, R2, and R3, respectively.

[0073] In step S220, after detecting the three-phase current of the three-phase compressor, the magnitude of the three-phase current can be determined, and the phase sequence corresponding to the maximum current among the three-phase currents can be determined as the target phase sequence.

[0074] For example, the current in phase U is denoted as I1, the current in phase V as I2, and the current in phase W as I3. If I1 is the largest, then phase U is taken as the target phase sequence; if I2 is the largest, then phase V is taken as the target phase sequence; if I3 is the largest, then phase W is taken as the target phase sequence.

[0075] In step S230, after the target phase sequence is determined, the other two phases in the three-phase compressor that are not in the target phase sequence can be commutated, thereby avoiding commutation of the phase with the largest current at this time and reducing the impact of commutation.

[0076] In some implementations... The commutation circuit diagram for a three-phase compressor can be referenced. Figure 3As shown, the microcontroller unit (MCU) controls the inverter circuit via six PWM (Pulse Width Modulation) waves, thereby enabling the inverter circuit to control the three-phase compressor through a three-phase circuit. R1, R2, and R3 are sampling resistors for each phase, and S1 to S7 are switching devices. In this embodiment, when determining whether to perform commutation on the three-phase compressor, the three-phase currents I1, I2, and I3 (U, V, W) of the three-phase compressor are first obtained through the sampling resistors R1, R2, and R3, and then the magnitudes of the three-phase currents are compared. This avoids performing commutation on the phase with the largest current at that time, reducing the impact of commutation. When the U-phase current I1 is at its maximum, the V and W phases are switched. First, the compressor stops rotating. After the three-phase compressor stops, switches S4 and S7 are opened and switches S6 and S9 are closed. When the V-phase current I2 is at its maximum, the U and W phases are switched. First, the compressor stops rotating. After the compressor stops, switches S1 and S7 are opened and switches S3 and S8 are closed. When the W-phase current I3 is at its maximum, the U and V phases are switched. First, the compressor stops rotating. After the compressor stops, switches S1 and S4 are opened and switches S2 and S5 are closed.

[0077] In this embodiment, after the three-phase compressor undergoes commutation, the compressor can be controlled to operate normally while the rotor angular velocity is continuously monitored. If the rotor angular velocity is determined to be greater than zero and the duration reaches the set time, the commutation of the three-phase compressor is considered successful, and the compressor is controlled to continue operating. It should be noted that the set time can be set according to actual conditions, and its specific value is not limited. For example, the set time can be 100 ms. That is, if ωr > 0 for more than 100 ms, the commutation is considered successful, and the compressor's rotation direction is normal.

[0078] If the rotor angular velocity is determined to be less than or equal to zero, the commutation of the three-phase compressor is determined to have failed. Then, the number of commutation failures since the compressor was powered on is compared to a set number. If the number of commutation failures is greater than or equal to the set number, the three-phase compressor is stopped and an alarm is issued. At this point, manual intervention is required to check the drive board or compressor for other faults. If the number of commutation failures is less than the set number, the process returns to the step of injecting a high-frequency voltage signal into the three-phase compressor, and subsequent judgment steps are repeated, in a loop, until the number of commutation failures is greater than or equal to the set number. Then, the three-phase compressor is stopped and an alarm is issued.

[0079] It should be noted that related technologies can only shut down the power after detecting reverse phase, resulting in prolonged inoperability of the refrigeration equipment. This embodiment, through phase commutation, allows the compressor to switch its actual rotation direction from reverse to forward without changing the external wiring, enabling the equipment to continue normal operation and ensuring the continuity and availability of the refrigeration system. Furthermore, commutating the phase with the highest current will generate significant voltage and current transients, potentially causing drive system oscillations or even component damage. This embodiment reduces the electrical impact of the commutation operation on the system by commutating the two phases with the lowest current, thus improving the safety of the commutation operation. In addition, this embodiment continuously monitors the rotor angular velocity after commutation. If ωr > 0 for a set time (e.g., 100ms), the commutation is confirmed as successful; if the commutation fails, it automatically retryes, only shutting down and alarming when the number of failures reaches a set threshold, thus balancing system fault tolerance and safety.

[0080] In one exemplary embodiment, a reverse phase detection device for a three-phase compressor is provided, applicable to equipment equipped with a three-phase compressor, such as industrial and commercial refrigeration equipment like central air conditioning units, chillers, and heat pump systems, or other equipment equipped with a three-phase compressor; the specific application is not limited thereto. This reverse phase detection device is used to implement the reverse phase detection method of any of the above embodiments. (Reference) Figure 4 As shown, for example, the inverted phase detection device may include: The detection module 10 is used to inject a high-frequency voltage signal into the three-phase compressor after the three-phase compressor is powered on and in a static state, so as to detect the three-phase high-frequency current signal of the three-phase compressor. The determining module 20 is used to determine at least two two-phase phase differences among the three-phase phases based on the three-phase high-frequency current signals. The determining module 20 is also used to determine whether there is a phase sequence abnormality in the three-phase compressor based on the compressor temperature of the three-phase compressor and at least two phase differences between the two phases; The detection module 10 is also used to control the three-phase compressor to start at low speed and detect the rotor angular velocity of the three-phase compressor when it is determined that there is a phase sequence error in the three-phase compressor. The determining module 20 is also used to determine the reverse phase detection result of the three-phase compressor based on the rotor angular velocity.

[0081] In one exemplary embodiment, a reverse phase detection device for a three-phase compressor is provided, applied to a device equipped with a three-phase compressor. This reverse phase detection device is used to implement the reverse phase detection method of any of the above embodiments. (Reference) Figure 4 As shown, in this embodiment, the determining module 20 can be used for: If the compressor temperature is greater than or equal to a first temperature threshold and less than or equal to a second temperature threshold, and if it is determined that the difference between at least one of the phase differences of the two phases and the target phase difference is greater than the first difference threshold, then the phase sequence of the three-phase compressor is determined to be abnormal.

[0082] In one exemplary embodiment, a reverse phase detection device for a three-phase compressor is provided, applied to a device equipped with a three-phase compressor. This reverse phase detection device is used to implement the reverse phase detection method of any of the above embodiments. (Reference) Figure 4 As shown, in this embodiment, the determining module 20 can be used for: If the compressor temperature is greater than or equal to a first temperature threshold and less than or equal to a second temperature threshold, and if it is determined that the difference between at least two phase differences between the two phases and the target phase difference is less than or equal to the first difference threshold, then the phase sequence of the three-phase compressor is determined to be normal.

[0083] In one exemplary embodiment, a reverse phase detection device for a three-phase compressor is provided, applied to a device equipped with a three-phase compressor. This reverse phase detection device is used to implement the reverse phase detection method of any of the above embodiments. (Reference) Figure 4 As shown, in this embodiment, the determining module 20 can be used for: If the compressor temperature is greater than or equal to a third temperature threshold, and if it is determined that the difference between at least one of the phase differences between two phases and the target phase difference is greater than a second difference threshold, then the phase sequence of the three-phase compressor is determined to be abnormal; wherein the third temperature threshold is greater than the second temperature threshold, and the second difference threshold is greater than the first difference threshold.

[0084] In one exemplary embodiment, a reverse phase detection device for a three-phase compressor is provided, applied to a device equipped with a three-phase compressor. This reverse phase detection device is used to implement the reverse phase detection method of any of the above embodiments. (Reference) Figure 4 As shown, in this embodiment, the determining module 20 can be used for: If the compressor temperature is greater than or equal to the third temperature threshold, and if it is determined that the difference between at least two phase differences and the target phase difference is greater than the second difference threshold, then the phase sequence of the three-phase compressor is determined to be normal.

[0085] In one exemplary embodiment, a reverse phase detection device for a three-phase compressor is provided, applied to a device equipped with a three-phase compressor. This reverse phase detection device is used to implement the reverse phase detection method of any of the above embodiments. (Reference) Figure 4 As shown, in this embodiment, the determining module 20 can be used for: If the compressor temperature is less than or equal to a fourth temperature threshold, and if it is determined that the difference between at least one of the phase differences between two phases and the target phase difference is greater than a third difference threshold, then the phase sequence of the three-phase compressor is determined to be abnormal; wherein the fourth temperature threshold is less than the first temperature threshold, and the third difference threshold is greater than the second difference threshold.

[0086] In one exemplary embodiment, a reverse phase detection device for a three-phase compressor is provided, applied to a device equipped with a three-phase compressor. This reverse phase detection device is used to implement the reverse phase detection method of any of the above embodiments. (Reference) Figure 4 As shown, in this embodiment, the determining module 20 can be used for: If the compressor temperature is less than or equal to the fourth temperature threshold, and if it is determined that the difference between at least two phase differences and the target phase difference is less than or equal to the third difference threshold, then the phase sequence of the three-phase compressor is determined to be normal.

[0087] In one exemplary embodiment, a reverse phase detection device for a three-phase compressor is provided, applied to a device equipped with a three-phase compressor. This reverse phase detection device is used to implement the reverse phase detection method of any of the above embodiments. (Reference) Figure 4 As shown, in this embodiment, the determining module 20 can be used for: If the rotor angular velocity is less than or equal to zero, then the three-phase compressor is determined to have a reverse phase.

[0088] In one exemplary embodiment, a reverse phase detection device for a three-phase compressor is provided, applied to a device equipped with a three-phase compressor. This reverse phase detection device is used to implement the reverse phase detection method of any of the above embodiments. (Reference) Figure 4 As shown, in this embodiment, the determining module 20 can be used for: If the rotor angular velocity is greater than zero, then the phase sequence of the three-phase compressor is determined to be normal.

[0089] In one exemplary embodiment, a reverse phase detection device for a three-phase compressor is provided, applied to a device equipped with a three-phase compressor. This reverse phase detection device is used to implement the reverse phase detection method of any of the above embodiments. (Reference) Figure 4 As shown in this embodiment, the frequency of the high-frequency voltage signal is greater than or equal to 500 Hz and less than or equal to 2 kHz.

[0090] In one exemplary embodiment, a reverse phase detection device for a three-phase compressor is provided, applied to a device equipped with a three-phase compressor. This reverse phase detection device is used to implement the reverse phase detection method of any of the above embodiments. (Reference) Figure 4 As shown, in this embodiment, the inverted phase detection device may include a commutation module 30, which can be used for: If it is determined that the three-phase compressor has a reverse phase, the three-phase compressor is subjected to a phase commutation process.

[0091] In one exemplary embodiment, a reverse phase detection device for a three-phase compressor is provided, applied to a device equipped with a three-phase compressor. This reverse phase detection device is used to implement the reverse phase detection method of any of the above embodiments. (Reference) Figure 4 As shown in this embodiment, The detection module 10 can be used to detect the three-phase current of the three-phase compressor; The determining module 20 can be used to determine the phase sequence corresponding to the maximum current in the three-phase current as the target phase sequence; The commutation module 30 can be used to perform commutation processing on the two phases of the three-phase compressor other than the target phase sequence.

[0092] In one exemplary embodiment, a reverse phase detection device for a three-phase compressor is provided, applied to a device equipped with a three-phase compressor. This reverse phase detection device is used to implement the reverse phase detection method of any of the above embodiments. (Reference) Figure 4 As shown, in this embodiment, the determining module 20 can be used for: After the three-phase compressor is commutated, if the rotor angular velocity is determined to be greater than zero and the duration reaches the set duration, the commutation of the three-phase compressor is determined to be successful, and the three-phase compressor is controlled to continue running.

[0093] In one exemplary embodiment, a reverse phase detection device for a three-phase compressor is provided, applied to a device equipped with a three-phase compressor. This reverse phase detection device is used to implement the reverse phase detection method of any of the above embodiments. (Reference) Figure 4 As shown, in this embodiment, the determining module 20 can be used for: If, after performing commutation on the three-phase compressor, the rotor angular velocity is determined to be less than or equal to zero, then the commutation of the three-phase compressor is determined to have failed. If the number of commutation failures is less than the set number, return to the step of injecting a high-frequency voltage signal into the three-phase compressor.

[0094] In one exemplary embodiment, a reverse phase detection device for a three-phase compressor is provided, applied to a device equipped with a three-phase compressor. This reverse phase detection device is used to implement the reverse phase detection method of any of the above embodiments. (Reference) Figure 4 As shown, in this embodiment, the determining module 20 can be used for: After determining that the three-phase compressor has failed to commutate, if the number of commutation failures is greater than or equal to the set number, the three-phase compressor is controlled to stop and an alarm message is issued.

[0095] This embodiment provides a reverse phase detection system, applied to equipment equipped with a three-phase compressor, for implementing the reverse phase detection method of any of the above embodiments.

[0096] This embodiment provides a device. This device can be, for example, industrial or commercial refrigeration equipment such as central air conditioning, chillers, or heat pump systems, or other equipment equipped with a three-phase compressor; there is no limitation on the specific type.

[0097] refer to Figure 5 As shown, the device 100 includes at least one processor 101, a memory 102, at least one network interface 104, and other user interfaces 103. The various components in the device 100 are coupled together via a bus system 105. It is understood that the bus system 105 is used to implement communication between these components. In addition to a data bus, the bus system 105 also includes a power bus, a control bus, and a status signal bus. However, for clarity, all buses are referred to as bus system 105.

[0098] The user interface 103 may include a display, keyboard, or clicking device (e.g., mouse, trackball, touchpad, or touchscreen).

[0099] It is understood that the memory 102 in the embodiments of this application can be volatile memory or non-volatile memory, or may include both volatile and non-volatile memory. The non-volatile memory can be read-only memory (ROM), programmable read-only memory (PROM), erasable programmable read-only memory (EPROM), electrically erasable programmable read-only memory (EEPROM), or flash memory. The volatile memory can be random access memory (RAM), which is used as an external cache. By way of example, but not limitation, many forms of RAM are available, such as Static Random Access Memory (SRAM), Dynamic Random Access Memory (DRAM), Synchronous DRAM (SDRAM), Double Data Rate Synchronous DRAM (DDRSDRAM), Enhanced Synchronous DRAM (ESDRAM), Synchronous Link DRAM (SLDRAM), and Direct Rambus RAM (DRRAM). The memory 102 described herein is intended to include, but is not limited to, these and any other suitable types of memory.

[0100] In some implementations, memory 102 stores elements, executable units or data structures, or subsets thereof, or extended sets thereof: operating system 1021 and application program 1022.

[0101] The operating system 1021 includes various system programs, such as a framework layer, a core library layer, and a driver layer, used to implement various basic business functions and handle hardware-based tasks. The application program 1022 includes various applications, such as a media player and a browser, used to implement various application functions. Programs implementing the methods of this application embodiment can be included in the application program 1022.

[0102] In this embodiment of the application, the processor 101 executes the methods provided in each method embodiment by calling the program or instructions stored in the memory 102, specifically the program or instructions stored in the application program 1022.

[0103] The methods disclosed in the embodiments of this application can be applied to or implemented by the processor 101. The processor 101 may be an integrated circuit chip with signal processing capabilities. In the implementation process, each step of the above method can be completed by the integrated logic circuit of the hardware or by instructions in the form of software in the processor 101. The processor 101 may be a general-purpose processor, a digital signal processor (DSP), an application-specific integrated circuit (ASIC), a field-programmable gate array (FPGA), or other programmable logic devices, discrete gate or transistor logic devices, or discrete hardware components. It can implement or execute the methods, steps, and logic block diagrams disclosed in the embodiments of this application. The general-purpose processor may be a microprocessor or any conventional processor. The steps of the methods disclosed in the embodiments of this application can be directly embodied in the execution of a hardware decoding processor, or executed by a combination of hardware and software units in the decoding processor. The software units may be located in random access memory, flash memory, read-only memory, programmable read-only memory, electrically erasable programmable memory, registers, or other mature storage media in the art. The storage medium is located in memory 102. Processor 101 reads the information in memory 102 and performs the above method in conjunction with its hardware.

[0104] It is understood that the embodiments described herein can be implemented in hardware, software, firmware, middleware, microcode, or a combination thereof. For hardware implementation, the processing unit can be implemented in one or more application-specific integrated circuits (ASICs), digital signal processors (DSPs), digital signal processing devices (DSPDs), programmable logic devices (PLDs), field-programmable gate arrays (FPGAs), general-purpose processors, controllers, microcontrollers, microprocessors, other electronic units for performing the functions described herein, or combinations thereof.

[0105] For software implementation, the techniques described herein can be implemented by units that perform the functions described herein. The software code can be stored in memory and executed by a processor. The memory can be implemented in the processor or external to the processor.

[0106] This application also provides a storage medium (computer-readable storage medium). This storage medium stores one or more programs. The storage medium may include volatile memory, such as random access memory; it may also include non-volatile memory, such as read-only memory, flash memory, hard disk, or solid-state drive; and it may also include combinations of the above types of memory.

[0107] When one or more programs in the storage medium can be executed by one or more processors to implement the method described above for execution in the refrigeration unit.

[0108] The processor is used to execute the control program of the refrigeration unit stored in the memory to implement the above-described method of execution in the refrigeration unit.

[0109] Those skilled in the art will further recognize that the units and algorithm steps of the various examples described in conjunction with the embodiments disclosed herein can be implemented in electronic hardware, computer software, or a combination of both. To clearly illustrate the interchangeability of hardware and software, the components and steps of the various examples have been generally described in terms of functionality in the foregoing description. Whether these functions are implemented in hardware or software depends on the specific application and design constraints of the technical solution. Those skilled in the art can use different methods to implement the described functions for each specific application, but such implementation should not be considered beyond the scope of this application.

[0110] It should be noted that the terms "one implementation," "embodiment," "exemplary embodiment," and "some embodiments" used in the specification indicate that the described embodiment may include a specific feature, structure, or characteristic, but not every embodiment necessarily includes that specific feature, structure, or characteristic. Furthermore, such phrases do not necessarily refer to the same embodiment. Moreover, when a specific feature, structure, or characteristic is described in connection with an embodiment, implementing such a feature, structure, or characteristic in conjunction with other embodiments, whether explicitly described or not, is within the knowledge scope of those skilled in the art.

[0111] It should be noted that, in this document, relational terms such as "first" and "second" are used merely 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 air conditioning 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 air conditioning apparatus. Unless otherwise specified, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or air conditioning apparatus that includes said element.

[0112] The above embodiments are merely preferred embodiments provided to fully illustrate this application, and the scope of protection of this application is not limited thereto. Equivalent substitutions or modifications made by those skilled in the art based on this application are all within the scope of protection of this application.

Claims

1. A method for detecting reverse phase in a three-phase compressor, characterized in that, The reverse phase detection method includes: After the three-phase compressor is powered on and in a static state, a high-frequency voltage signal is injected into the three-phase compressor to detect the three-phase high-frequency current signal of the three-phase compressor. Based on the three-phase high-frequency current signal, at least two two-phase phase differences among the three phases are determined; Based on the compressor temperature of the three-phase compressor and at least two phase differences between the two phases, determine whether there is a phase sequence abnormality in the three-phase compressor; If it is determined that there is a phase sequence abnormality in the three-phase compressor, the three-phase compressor is controlled to start at low speed, and the rotor angular velocity of the three-phase compressor is detected. Based on the rotor angular velocity, the reverse phase detection result of the three-phase compressor is determined.

2. The inverse phase detection method according to claim 1, characterized in that, The determination of whether there is a phase sequence abnormality in the three-phase compressor based on the compressor temperature of the three-phase compressor and at least two phase differences between the two phases includes: If the compressor temperature is greater than or equal to a first temperature threshold and less than or equal to a second temperature threshold, and if it is determined that the difference between at least one of the phase differences of the two phases and the target phase difference is greater than the first difference threshold, then the phase sequence of the three-phase compressor is determined to be abnormal.

3. The inverse phase detection method according to claim 1, characterized in that, The determination of whether there is a phase sequence abnormality in the three-phase compressor based on the compressor temperature of the three-phase compressor and at least two phase differences between the two phases includes: If the compressor temperature is greater than or equal to a first temperature threshold and less than or equal to a second temperature threshold, and if it is determined that the difference between at least two phase differences between the two phases and the target phase difference is less than or equal to the first difference threshold, then the phase sequence of the three-phase compressor is determined to be normal.

4. The inverse phase detection method according to claim 2, characterized in that, The determination of whether there is a phase sequence abnormality in the three-phase compressor based on the compressor temperature of the three-phase compressor and at least two phase differences between the two phases includes: If the compressor temperature is greater than or equal to a third temperature threshold, and if it is determined that the difference between at least one of the phase differences between two phases and the target phase difference is greater than a second difference threshold, then the phase sequence of the three-phase compressor is determined to be abnormal; wherein the third temperature threshold is greater than the second temperature threshold, and the second difference threshold is greater than the first difference threshold.

5. The inverse phase detection method according to claim 2, characterized in that, The determination of whether there is a phase sequence abnormality in the three-phase compressor based on the compressor temperature of the three-phase compressor and at least two phase differences between the two phases includes: If the compressor temperature is greater than or equal to the third temperature threshold, and if it is determined that the difference between at least two phase differences and the target phase difference is less than or equal to the second difference threshold, then the phase sequence of the three-phase compressor is determined to be normal.

6. The inverse phase detection method according to claim 4, characterized in that, The determination of whether there is a phase sequence abnormality in the three-phase compressor based on the compressor temperature of the three-phase compressor and at least two phase differences between the two phases includes: If the compressor temperature is less than or equal to a fourth temperature threshold, and if it is determined that the difference between at least one of the phase differences between two phases and the target phase difference is greater than a third difference threshold, then the phase sequence of the three-phase compressor is determined to be abnormal; wherein the fourth temperature threshold is less than the first temperature threshold, and the third difference threshold is greater than the second difference threshold.

7. The inverse phase detection method according to claim 4, characterized in that, The determination of whether there is a phase sequence abnormality in the three-phase compressor based on the compressor temperature of the three-phase compressor and at least two phase differences between the two phases includes: If the compressor temperature is less than or equal to the fourth temperature threshold, and if it is determined that the difference between at least two phase differences and the target phase difference is less than or equal to the third difference threshold, then the phase sequence of the three-phase compressor is determined to be normal.

8. The inverse phase detection method according to claim 1, characterized in that, The determination of the reverse phase detection result of the three-phase compressor based on the rotor angular velocity includes: If the rotor angular velocity is less than or equal to zero, then the three-phase compressor is determined to have a reverse phase.

9. The inverse phase detection method according to claim 1, characterized in that, The determination of the reverse phase detection result of the three-phase compressor based on the rotor angular velocity includes: If the rotor angular velocity is greater than zero, then the phase sequence of the three-phase compressor is determined to be normal.

10. The inverse phase detection method according to claim 1, characterized in that, The frequency of the high-frequency voltage signal is greater than or equal to 500 Hz and less than or equal to 2 kHz.

11. The inverse phase detection method according to any one of claims 1-10, characterized in that, The reverse phase detection method includes: If it is determined that the three-phase compressor has a reverse phase, the three-phase compressor is subjected to a phase commutation process.

12. The inverse phase detection method according to claim 11, characterized in that, The commutation process for the three-phase compressor includes: Detect the three-phase current of the three-phase compressor; The phase sequence corresponding to the maximum current among the three phase currents is determined as the target phase sequence; The two phases of the three-phase compressor other than the target phase sequence are subjected to phase commutation.

13. The inverse phase detection method according to claim 11, characterized in that, After performing phase commutation on the three-phase compressor, the reverse phase detection method includes: If the rotor angular velocity is determined to be greater than zero and the duration reaches the set duration, then the commutation of the three-phase compressor is determined to be successful, and the three-phase compressor is controlled to continue running.

14. The inverse phase detection method according to claim 11, characterized in that, After performing phase commutation on the three-phase compressor, the reverse phase detection method further includes: If the rotor angular velocity is determined to be less than or equal to zero, then the commutation of the three-phase compressor is determined to have failed. If the number of commutation failures is less than the set number, return to the step of injecting a high-frequency voltage signal into the three-phase compressor.

15. The inverse phase detection method according to claim 14, characterized in that, After determining that the commutation of the three-phase compressor has failed, the reverse phase detection method includes: If the number of commutation failures is greater than or equal to the set number, the three-phase compressor is controlled to stop and an alarm message is issued.

16. A reverse phase detection device, characterized in that, The reverse phase detection device includes: The detection module is used to inject a high-frequency voltage signal into the three-phase compressor after it is powered on and in a static state, so as to detect the three-phase high-frequency current signal of the three-phase compressor. The determination module is used to determine at least two two-phase phase differences among the three-phase phases based on the three-phase high-frequency current signals. The determining module is further configured to determine whether there is a phase sequence abnormality in the three-phase compressor based on the compressor temperature of the three-phase compressor and at least two phase differences between the two phases; The detection module is also used to control the three-phase compressor to start at low speed and detect the rotor angular velocity of the three-phase compressor when it is determined that there is a phase sequence error in the three-phase compressor. The determining module is also used to determine the reverse phase detection result of the three-phase compressor based on the rotor angular velocity.

17. A reverse phase detection system, characterized in that, The reverse phase detection system is used to implement the reverse phase detection method as described in any one of claims 1-15.

18. A device, characterized in that, The device includes a three-phase compressor, and further includes a processor and a memory, the processor being configured to execute a control program stored in the memory to implement the reverse phase detection method as described in any one of claims 1-15.

19. A storage medium, characterized in that, The storage medium stores one or more programs, which can be executed by one or more processors to implement the inverse detection method as described in any one of claims 1-15.

Images