Method for controlling a three-phase inverter circuit and three-phase inverter circuit

Abstract

The application provides a control method of a three-phase inverter circuit and the three-phase inverter circuit. The method comprises the following steps: obtaining target reporting data of each target temperature sensor; when the target reporting data meets a first preset condition, controlling a target derating curve corresponding to the target temperature sensor to be moved left by a first preset temperature as a whole, and controlling the working state of the three-phase inverter circuit based on the target derating curve after the whole left movement of the first preset temperature, or increasing the highest temperature data in the target reporting data of each target temperature sensor by a first preset temperature, and controlling the working state of the three-phase inverter circuit based on the highest temperature data after the increase of the first preset temperature. The application can make the three-phase inverter circuit continue to work when an abnormality occurs, only the working power is reduced, so that the three-phase inverter circuit can continue to generate power, the power generation of the whole system will not be greatly reduced, and the three-phase inverter circuit can be protected to a certain extent, and device damage is avoided.

Description

Technical Field

[0001] This invention relates to the field of circuit control technology, and in particular to a control method for a three-phase inverter circuit and a three-phase inverter circuit. Background Technology

[0002] In a three-phase inverter circuit, each phase's upper and lower bridge arms are equipped with corresponding temperature sensors to detect the temperature of the IGBT modules in that bridge arm. The controller uses the temperature data reported by each temperature sensor to control the operating state of the three-phase inverter circuit.

[0003] Currently, when a temperature sensor reports an anomaly, it may indicate a fault in the corresponding IGBT module. In this case, if the three-phase inverter circuit is not protected and continues to operate in its current mode, it may damage other components; if the three-phase inverter circuit is protected and shut down, the overall system power generation will be significantly reduced. Summary of the Invention

[0004] This invention provides a control method and a three-phase inverter circuit to address the problem that if the three-phase inverter circuit is not protected when a temperature sensor reports an abnormality, other devices may be damaged, while protecting the three-phase inverter circuit will significantly reduce the power generation of the entire system.

[0005] In a first aspect, embodiments of the present invention provide a control method for a three-phase inverter circuit, the three-phase inverter circuit including target temperature sensors for reflecting the device temperatures of the upper and lower bridge arms of each phase; the control method for the three-phase inverter circuit includes:

[0006] Acquire target-reported data from each target temperature sensor;

[0007] When the target reported data meets the first preset condition, the target derating curve corresponding to the target temperature sensor is shifted to the left by the first preset temperature, and the working state of the three-phase inverter circuit is controlled based on the target derating curve after the overall left shift by the first preset temperature. Alternatively, the highest temperature data in the target reported data of each target temperature sensor is increased by the first preset temperature, and the working state of the three-phase inverter circuit is controlled based on the highest temperature data after the increase by the first preset temperature.

[0008] The target derating curve has temperature on the horizontal axis and power derating factor on the vertical axis. The first preset condition is used to indicate that there is an abnormality in the devices of the upper and lower bridge arms of one phase of the three-phase inverter circuit.

[0009] In one possible implementation, the first preset condition includes that the target reported data of the target temperature sensor corresponding to the upper and lower bridge arms of one phase of the three-phase inverter circuit are both abnormal and the inverter current of that phase is greater than a first current threshold, or that the target reported data of the target temperature sensor of any four bridge arms of the three-phase inverter circuit are all abnormal.

[0010] In one possible implementation, the three-phase inverter circuit is provided with a corresponding heat sink; the target temperature sensor includes a first temperature sensor disposed on the upper and lower bridge arms of each phase of the three-phase inverter circuit, and / or a second temperature sensor disposed on the heat sink and corresponding one-to-one with the upper and lower bridge arms of each phase.

[0011] Accordingly, the target reported data of each target temperature sensor includes the first reported data of each first temperature sensor and / or the second reported data of each second temperature sensor.

[0012] The target derating curve corresponding to the target temperature sensor includes the first derating curve corresponding to the first temperature sensor, and / or the second derating curve corresponding to the second temperature sensor.

[0013] In one possible implementation, when the target temperature sensor includes a first temperature sensor and a second temperature sensor:

[0014] When the first reported data and / or the second reported data meet the first preset condition, it is determined that the target reported data meets the first preset condition;

[0015] Accordingly, the target derating curve corresponding to the target temperature sensor is shifted to the left by a first preset temperature, and the operating state of the three-phase inverter circuit is controlled based on the target derating curve after the overall left shift by the first preset temperature, including:

[0016] The first derating curve and the second derating curve are both shifted to the left by a first preset angle. Based on the first derating curve after shifting to the left by a first preset temperature and the second derating curve after shifting to the left by a first preset temperature, the working state of the three-phase inverter circuit is controlled.

[0017] The highest temperature data reported by each target temperature sensor is increased by a first preset temperature, and the operating state of the three-phase inverter circuit is controlled based on the highest temperature data after the first preset temperature increase, including:

[0018] The first maximum temperature data in the first reported data of each first temperature sensor and the second maximum temperature data in the second reported data of each second temperature sensor are all increased by a first preset temperature. Based on the first maximum temperature data after increasing the first preset temperature and the second maximum temperature data after increasing the first preset temperature, the operating state of the three-phase inverter circuit is controlled.

[0019] In one possible implementation, the operating state of the three-phase inverter circuit is controlled based on a first derating curve shifted left by a first preset temperature and a second derating curve shifted left by a first preset temperature, including:

[0020] Based on the first derating curve after shifting the whole to the left by the first preset temperature, the first derating coefficient corresponding to the first highest temperature data is determined.

[0021] Based on the second derating curve after shifting the whole temperature to the left by the first preset temperature, the second derating coefficient corresponding to the second highest temperature data is determined.

[0022] The operating state of the three-phase inverter circuit is controlled based on the smaller value of the first derating factor and the second derating factor.

[0023] In one possible implementation, the operating state of the three-phase inverter circuit is controlled based on a first maximum temperature data after increasing the first preset temperature and a second maximum temperature data after increasing the first preset temperature, including:

[0024] Based on the first derating curve, determine the third derating coefficient corresponding to the first maximum temperature data after increasing the first preset temperature;

[0025] Based on the second derating curve, determine the fourth derating coefficient corresponding to the second highest data after increasing the first preset temperature;

[0026] The operating state of the three-phase inverter circuit is controlled based on the smaller value of the third derating factor and the fourth derating factor.

[0027] In one possible implementation, the target derate curve is a piecewise curve, including at least one target piecewise threshold;

[0028] The target derating curve corresponding to the control target temperature sensor is shifted to the left by a first preset temperature, including:

[0029] The threshold values ​​of each target segment of the target derating curve corresponding to the target temperature sensor are all reduced by the first preset temperature.

[0030] In one possible implementation, after acquiring the target reported data from each target temperature sensor, the control method for the three-phase inverter circuit further includes:

[0031] When the target reported data meets the second preset condition, the target derating curve corresponding to the target temperature sensor is shifted to the left by the second preset temperature, and the working state of the three-phase inverter circuit is controlled based on the target derating curve after the overall left shift by the second preset temperature; or, the highest temperature data in the target reported data of each target temperature sensor is increased by the second preset temperature, and the working state of the three-phase inverter circuit is controlled based on the highest temperature data after the increase by the second preset temperature; the second preset temperature is greater than the first preset temperature.

[0032] The second preset condition is used to indicate that all three phases of the three-phase inverter circuit have abnormalities.

[0033] In one possible implementation, the second preset condition includes that the target temperature sensors of at least five arms of the three-phase inverter circuit all report abnormalities.

[0034] Secondly, embodiments of the present invention provide a three-phase inverter circuit, including a controller and a target temperature sensor for reflecting the device temperature of the upper and lower bridge arms of each phase; the target temperature sensor is connected to the controller.

[0035] The controller is used to execute the control method for the three-phase inverter circuit as described in the first aspect or any possible implementation thereof.

[0036] Thirdly, embodiments of the present invention provide a controller, including a memory and a processor. The memory is used to store a computer program, and the processor is used to call and run the computer program stored in the memory to execute the control method for a three-phase inverter circuit as described in the first aspect or any possible implementation of the first aspect.

[0037] Fourthly, embodiments of the present invention provide a computer-readable storage medium storing a computer program that, when executed by a processor, implements the steps of the control method for a three-phase inverter circuit as described in the first aspect or any possible implementation thereof.

[0038] This invention provides a control method and a three-phase inverter circuit. When the target reported data from each target temperature sensor meets a first preset condition (i.e., when the devices in the upper and lower arms of one phase of the three-phase inverter circuit are abnormal), the method shifts the target derating curve corresponding to the target temperature sensor to the left by a first preset temperature. Based on this shifted target derating curve, the method controls the operating state of the three-phase inverter circuit. Alternatively, it increases the highest temperature data from the target reported data of each target temperature sensor by a first preset temperature and controls the operating state of the three-phase inverter circuit based on this increased highest temperature data. This allows the three-phase inverter circuit to continue operating, albeit with reduced power output, rather than stopping operation. This ensures the three-phase inverter circuit continues to generate electricity without significantly reducing the overall system power output, while also providing some protection to the circuit and preventing device damage. Attached Figure Description

[0039] To more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0040] Figure 1 This is a flowchart illustrating the control method for a three-phase inverter circuit provided in an embodiment of the present invention;

[0041] Figure 2 This is a schematic diagram of the target depreciation curve provided in an embodiment of the present invention;

[0042] Figure 3 This is a schematic diagram of the structure of the control device for the three-phase inverter circuit provided in an embodiment of the present invention;

[0043] Figure 4 This is a schematic diagram of the controller provided in an embodiment of the present invention. Detailed Implementation

[0044] In the following description, specific details such as particular system architectures and techniques are set forth for illustrative purposes and not for limitation, in order to provide a thorough understanding of the embodiments of the invention. However, those skilled in the art will understand that the invention can be implemented in other embodiments without these specific details. In other instances, detailed descriptions of well-known systems, apparatuses, circuits, and methods are omitted so as not to obscure the description of the invention with unnecessary detail.

[0045] To make the objectives, technical solutions, and advantages of the present invention clearer, specific embodiments will be described below in conjunction with the accompanying drawings.

[0046] See Figure 1 The diagram illustrates the implementation flowchart of the control method for a three-phase inverter circuit provided in this embodiment of the invention. The controller can be the entity executing the control method for the three-phase inverter circuit described above.

[0047] The three-phase inverter circuit includes target temperature sensors for reflecting the device temperature of the upper and lower bridge arms of each phase. Each phase of the three-phase inverter circuit includes a corresponding upper and lower bridge arm. Each phase's upper and lower bridge arm has a target temperature sensor reflecting the device temperature of its respective bridge arm. The target temperature sensor can be a temperature sensor directly installed on the corresponding bridge arm to detect the temperature of the corresponding device, or it can be a temperature sensor located elsewhere on the bridge arm to indirectly reflect the temperature of the corresponding device.

[0048] The control methods for the above-mentioned three-phase inverter circuit include:

[0049] In S101, target reported data from each target temperature sensor is acquired.

[0050] The target temperature sensor can detect temperature data at its location and report the detected temperature data to the controller. The target temperature sensor can also report fault information if it cannot detect temperature data. Therefore, the reported data can include the temperature data detected by the corresponding target temperature sensor and / or fault information.

[0051] In S102, when the target reported data meets the first preset condition, the target derating curve corresponding to the target temperature sensor is shifted to the left by the first preset temperature, and the working state of the three-phase inverter circuit is controlled based on the target derating curve after the overall left shift by the first preset temperature; or, the highest temperature data in the target reported data of each target temperature sensor is increased by the first preset temperature, and the working state of the three-phase inverter circuit is controlled based on the highest temperature data after the increase by the first preset temperature.

[0052] The target derating curve has temperature on the horizontal axis and power derating factor on the vertical axis. The first preset condition is used to indicate that there is an abnormality in the devices of the upper and lower bridge arms of one phase of the three-phase inverter circuit.

[0053] In this embodiment, when the target reported data meets the first preset condition, it indicates that the devices in the upper and lower arms of one phase of the three-phase inverter circuit are abnormal. Specifically, the devices in the upper and lower arms of phase A are abnormal, or the devices in the upper and lower arms of phase B are abnormal, or the devices in the upper and lower arms of phase C are abnormal. The devices in each upper and lower arm can be switching transistors, such as IGBT modules or other power transistors. Device abnormalities may include excessively high device temperature and / or fault information reported by the corresponding target temperature sensor, etc.

[0054] When the target reported data meets the first preset condition, the target derating curve corresponding to the target temperature sensor is shifted to the left by the first preset temperature, and the working state of the three-phase inverter circuit is controlled based on the target derating curve after the overall left shift of the first preset temperature. Alternatively, the highest temperature data in the target reported data of each target temperature sensor is increased by the first preset temperature, and the working state of the three-phase inverter circuit is controlled based on the highest temperature data after the increase of the first preset temperature. Both methods are aimed at reducing the working power of the three-phase inverter circuit compared to the normal working power, thereby reducing the heat generated by the devices and avoiding damage to the devices due to high temperature.

[0055] Specifically, under normal conditions (no abnormalities in any phase arm), the operating state of the three-phase inverter circuit is controlled according to the target derating curve corresponding to the target temperature sensor. For example, the highest temperature can be obtained from the temperature data reported by each target temperature sensor, and the target derating curve can be consulted to obtain the derating factor corresponding to that highest temperature. The operating state of the three-phase inverter circuit is then controlled according to this derating factor. That is, the derating factor is multiplied by the rated power of the three-phase inverter circuit to obtain the power setpoint of the three-phase inverter circuit, and the three-phase inverter circuit is controlled to operate according to this power setpoint.

[0056] When only one device in the upper arm or one device in the lower arm of a phase malfunctions, controlling the three-phase inverter circuit according to normal control methods usually does not cause problems. However, when both devices in the upper and lower arms of the same phase malfunction, controlling the three-phase inverter circuit according to normal control methods may damage the devices. Therefore, by shifting the target derating curve corresponding to the target temperature sensor to the left by a first preset temperature (the target derating curve shows that the power derating coefficient gradually decreases as the temperature increases), the power setpoint of the three-phase inverter circuit can be reduced at the same detection temperature, thereby reducing heat generation. Similarly, by increasing the highest temperature data in the target reported data of each target temperature sensor by a first preset temperature, the power setpoint of the three-phase inverter circuit can also be reduced, thereby reducing heat generation.

[0057] In this diagram, the horizontal axis of the target derating curve represents temperature, and the vertical axis represents the power derating factor. The power derating factor can be understood as the ratio of the power setpoint of the three-phase inverter circuit to its rated power. The power setpoint can be understood as the target power value, which is the actual power of the three-phase inverter circuit controlled to the power setpoint.

[0058] The first preset temperature can be determined based on actual needs or relevant experiments. For example, it can be 3 degrees, 4 degrees, or 5 degrees, etc.

[0059] In this embodiment, when the target reported data from each target temperature sensor meets the first preset condition, i.e., when the devices in the upper and lower arms of one phase of the three-phase inverter circuit are abnormal, the target derating curve corresponding to the target temperature sensor is shifted to the left by a first preset temperature. The operating state of the three-phase inverter circuit is controlled based on the target derating curve after the shift. Alternatively, the highest temperature data in the target reported data of each target temperature sensor is increased by a first preset temperature, and the operating state of the three-phase inverter circuit is controlled based on the highest temperature data after the increase. This allows the three-phase inverter circuit to continue operating, albeit with reduced power, rather than stopping operation. This ensures that the three-phase inverter circuit continues to generate electricity without significantly reducing the overall system power output, while also providing some protection to the three-phase inverter circuit and preventing device damage.

[0060] In some embodiments, the first preset condition includes the target reported data of the target temperature sensor corresponding to the upper and lower bridge arms of one phase of the three-phase inverter circuit both indicating abnormality and the inverter current of that phase being greater than a first current threshold, or the target reported data of the target temperature sensor of any four bridge arms of the three-phase inverter circuit both indicating abnormality.

[0061] When the target reported data from the target temperature sensors corresponding to the upper and lower arms of one phase (phase A, phase B, or phase C) of the three-phase inverter circuit both indicate anomalies and the inverter current of that phase exceeds a first current threshold, the target reported data is determined to meet the first preset condition. Alternatively, when the target reported data from the target temperature sensors of any four arms of the three-phase inverter circuit all indicate anomalies, the target reported data is determined to meet the first preset condition. Any four arms can include upper and lower arms; for example, it can be one upper arm and three lower arms, two upper arms and two lower arms, or three upper arms and one lower arm, etc. One upper arm and one lower arm among the four arms must belong to the same phase.

[0062] For each target temperature sensor, if the temperature data in the target reported data of the target temperature sensor is greater than the corresponding target temperature upper limit, or if the target reported data of the target temperature sensor contains fault information, then the target reported data of the target temperature sensor is determined to be abnormal.

[0063] The upper limit of the target temperature can be set according to actual needs, and no specific restrictions are imposed here. When the temperature data exceeds the corresponding upper limit of the target temperature, it indicates that the temperature of the corresponding bridge arm's device is too high. When the target temperature sensor's reported data contains fault information, it indicates that the corresponding bridge arm's device or the target temperature sensor itself has malfunctioned.

[0064] The first current threshold is greater than the average value of the inverter current of each phase of the three-phase inverter circuit. For example, the first current threshold can be 1.02 times, 1.05 times, etc., of this average value.

[0065] In some embodiments, the three-phase inverter circuit is provided with a corresponding heat sink; the target temperature sensor includes a first temperature sensor disposed on the upper and lower bridge arms of each phase of the three-phase inverter circuit, and / or a second temperature sensor disposed on the heat sink and corresponding one-to-one with the upper and lower bridge arms of each phase.

[0066] Accordingly, the target reported data of each target temperature sensor includes the first reported data of each first temperature sensor and / or the second reported data of each second temperature sensor.

[0067] The target derating curve corresponding to the target temperature sensor includes the first derating curve corresponding to the first temperature sensor, and / or the second derating curve corresponding to the second temperature sensor.

[0068] Three-phase inverter circuits can have corresponding heat sinks for heat dissipation.

[0069] A first temperature sensor can be installed on each upper and lower bridge arm of the three-phase inverter circuit to directly detect the temperature of the device on the corresponding bridge arm. A second temperature sensor, corresponding to each upper and lower bridge arm, can be installed on the heat sink. The second temperature sensor is installed in a position closest to the device on the corresponding upper or lower bridge arm. Therefore, although the second temperature sensor is installed on the heat sink, it can still reflect the temperature of the device on the corresponding bridge arm.

[0070] In one embodiment, the aforementioned target temperature sensors may include only the first temperature sensors disposed in the three-phase inverter circuit. Correspondingly, the target reporting data of each target temperature sensor may include only the first reporting data of each first temperature sensor; the target derating curve corresponding to the target temperature sensor includes only the first derating curve corresponding to the first temperature sensor. Each first temperature sensor corresponds to the same derating curve, i.e., the first derating curve.

[0071] Accordingly, S101 may include: acquiring the first reported data from each of the first temperature sensors.

[0072] S102 may include: when the first reported data meets the first preset condition, controlling the first derating curve corresponding to the first temperature sensor to shift left by a first preset temperature, and controlling the operating state of the three-phase inverter circuit based on the first derating curve shifted left by the first preset temperature; or, increasing the first highest temperature data in the first reported data of each first temperature sensor by the first preset temperature, and controlling the operating state of the three-phase inverter circuit based on the first highest temperature data increased by the first preset temperature. The first preset condition includes that the first reported data of the first temperature sensors corresponding to the upper and lower bridge arms of one phase of the three-phase inverter circuit both indicate anomalies and the inverter current of that phase is greater than a first current threshold; or, the target reported data of the first temperature sensors of any four bridge arms of the three-phase inverter circuit all indicate anomalies.

[0073] In another embodiment, each of the aforementioned target temperature sensors may consist only of the second temperature sensors disposed on the heat sink. Correspondingly, the target reported data of each target temperature sensor may consist only of the second reported data of each second temperature sensor; the target derating curve corresponding to the target temperature sensor consists only of the second derating curve corresponding to the second temperature sensor. Each second temperature sensor corresponds to the same derating curve, i.e., the second derating curve.

[0074] Accordingly, S101 may include: acquiring the second reported data from each of the second temperature sensors.

[0075] S102 may include: when the second reported data meets the first preset condition, controlling the second derating curve corresponding to the second temperature sensor to shift to the left by a first preset temperature, and controlling the operating state of the three-phase inverter circuit based on the second derating curve shifted to the left by the first preset temperature; or, increasing the second highest temperature data in the second reported data of each second temperature sensor by the first preset temperature, and controlling the operating state of the three-phase inverter circuit based on the second highest temperature data increased by the first preset temperature. The first preset condition includes that the second reported data of the second temperature sensors corresponding to the upper and lower bridge arms of one phase of the three-phase inverter circuit are both abnormal and the inverter current of that phase is greater than a first current threshold; or, the target reported data of the second temperature sensors of any four bridge arms of the three-phase inverter circuit are all abnormal.

[0076] The target temperature upper limit corresponding to the first temperature sensor is the first upper temperature value, and the target temperature upper limit corresponding to the second temperature sensor is the second upper temperature value. The first and second upper temperature values ​​can be determined according to actual needs or relevant experiments, and no specific restrictions are imposed here.

[0077] In another embodiment, each of the target temperature sensors may include a first temperature sensor disposed in the three-phase inverter circuit and a second temperature sensor disposed on the heat sink; correspondingly, the target reporting data of each target temperature sensor may include the first reporting data of each first temperature sensor and the second reporting data of each second temperature sensor; the target derating curve corresponding to the target temperature sensor may include the first derating curve corresponding to the first temperature sensor and the second derating curve corresponding to the second temperature sensor.

[0078] Accordingly, S101 may include: acquiring first reported data from each first temperature sensor and second reported data from each second temperature sensor.

[0079] In this embodiment, when the target temperature sensor includes a first temperature sensor and a second temperature sensor:

[0080] When the first reported data and / or the second reported data meet the first preset condition, the target reported data is determined to meet the first preset condition; that is, when at least one of the first reported data and the second reported data meets the first preset condition, the target reported data is determined to meet the first preset condition.

[0081] Accordingly, the target derating curve corresponding to the target temperature sensor is shifted to the left by a first preset temperature, and the operating state of the three-phase inverter circuit is controlled based on the target derating curve after the overall left shift by the first preset temperature, including:

[0082] The first derating curve and the second derating curve are both shifted to the left by a first preset angle. Based on the first derating curve after shifting to the left by a first preset temperature and the second derating curve after shifting to the left by a first preset temperature, the working state of the three-phase inverter circuit is controlled.

[0083] The highest temperature data reported by each target temperature sensor is increased by a first preset temperature, and the operating state of the three-phase inverter circuit is controlled based on the highest temperature data after the first preset temperature increase, including:

[0084] The first maximum temperature data in the first reported data of each first temperature sensor and the second maximum temperature data in the second reported data of each second temperature sensor are all increased by a first preset temperature. Based on the first maximum temperature data after increasing the first preset temperature and the second maximum temperature data after increasing the first preset temperature, the operating state of the three-phase inverter circuit is controlled.

[0085] Specifically, when determining whether the first reported data meets the first preset condition, the first preset condition includes that the first reported data from the first temperature sensors corresponding to the upper and lower arms of one phase of the three-phase inverter circuit are both abnormal and the inverter current of that phase is greater than a first current threshold, or that the target reported data from the first temperature sensors of any four arms of the three-phase inverter circuit are all abnormal. When determining whether the second reported data meets the first preset condition, the first preset condition includes that the second reported data from the second temperature sensors corresponding to the upper and lower arms of one phase of the three-phase inverter circuit are both abnormal and the inverter current of that phase is greater than a first current threshold, or that the target reported data from the second temperature sensors of any four arms of the three-phase inverter circuit are all abnormal.

[0086] In some embodiments, controlling the operating state of the three-phase inverter circuit based on the first derating curve shifted to the left by a first preset temperature and the second derating curve shifted to the left by a first preset temperature includes:

[0087] Based on the first derating curve after shifting the whole to the left by the first preset temperature, the first derating coefficient corresponding to the first highest temperature data is determined.

[0088] Based on the second derating curve after shifting the whole temperature to the left by the first preset temperature, the second derating coefficient corresponding to the second highest temperature data is determined.

[0089] The operating state of the three-phase inverter circuit is controlled based on the smaller value of the first derating factor and the second derating factor.

[0090] The first highest temperature data is the highest temperature data reported by each of the first temperature sensors in the first reported data, and the second highest temperature data is the highest temperature data reported by each of the second temperature sensors in the second reported data. In the first derating curve after shifting the entire data to the left by a first preset temperature, the derating factor corresponding to the first highest temperature data is the first derating factor. In the second derating curve after shifting the entire data to the left by a first preset temperature, the derating factor corresponding to the second highest temperature data is the second derating factor.

[0091] The smaller of the first derating factor and the second derating factor is determined, and the product of the smaller value and the rated power is used as the power setpoint. The operation of the three-phase inverter circuit is controlled based on the power setpoint.

[0092] In some embodiments, controlling the operating state of the three-phase inverter circuit based on the first maximum temperature data after increasing the first preset temperature and the second maximum temperature data after increasing the first preset temperature includes:

[0093] Based on the first derating curve, determine the third derating coefficient corresponding to the first maximum temperature data after increasing the first preset temperature;

[0094] Based on the second derating curve, determine the fourth derating coefficient corresponding to the second highest data after increasing the first preset temperature;

[0095] The operating state of the three-phase inverter circuit is controlled based on the smaller value of the third derating factor and the fourth derating factor.

[0096] In the first derating curve, the derating factor corresponding to the first highest temperature data after adding the first preset temperature is the third derating factor. In the second derating curve, the derating factor corresponding to the second highest data after adding the first preset temperature is the fourth derating factor.

[0097] The smaller of the third and fourth derating factors is determined, and the product of this smaller value and the rated power is used as the power setpoint. The operation of the three-phase inverter circuit is controlled based on this power setpoint.

[0098] In some embodiments, the target derate curve is a piecewise curve, including at least one target piecewise threshold;

[0099] The target derating curve corresponding to the control target temperature sensor is shifted to the left by a first preset temperature, including:

[0100] The threshold values ​​of each target segment of the target derating curve corresponding to the target temperature sensor are all reduced by the first preset temperature.

[0101] The target derating curve is usually set in segments; the higher the temperature, the faster the power derating factor decreases. The target segment threshold is the segment threshold on the horizontal axis, i.e., the segment threshold for temperature.

[0102] For example, see Figure 2 , Figure 2 The target derating curve is defined by the horizontal axis T representing temperature and the vertical axis P representing the power derating factor. The target derating curve includes three target segmented thresholds, namely T1, T2 and T3. When the temperature is T1, the corresponding derating factor is P1; when the temperature is T2, the corresponding derating factor is P2; and when the temperature is T3, the corresponding derating factor is P3.

[0103] The target derating curve corresponding to the target temperature sensor is shifted to the left by a first preset temperature, that is, the three segment thresholds of the target derating curve are changed to T1-T4, T2-T4, and T3-T4, respectively. T4 is the first preset temperature. In the target derating curve shifted to the left by the first preset temperature, when the temperature is T1-T4, the corresponding derating coefficient is P1; when the temperature is T2-T4, the corresponding derating coefficient is P2; and when the temperature is T3-T4, the corresponding derating coefficient is P3.

[0104] In some embodiments, after S101, the control method for the three-phase inverter circuit further includes:

[0105] When the target reported data meets the second preset condition, the target derating curve corresponding to the target temperature sensor is shifted to the left by the second preset temperature, and the working state of the three-phase inverter circuit is controlled based on the target derating curve after the overall left shift by the second preset temperature; or, the highest temperature data in the target reported data of each target temperature sensor is increased by the second preset temperature, and the working state of the three-phase inverter circuit is controlled based on the highest temperature data after the increase by the second preset temperature; the second preset temperature is greater than the first preset temperature.

[0106] The second preset condition is used to indicate that all three phases of the three-phase inverter circuit have abnormalities.

[0107] In this embodiment, when the target reported data meets the second preset condition, it is determined that all three phases of the three-phase inverter circuit have abnormalities, that is, there are more abnormal devices than when the first preset condition is met. At this time, the target derating curve is shifted to the left by the second preset temperature, which is higher than the first preset temperature, or the highest temperature data is increased by the second preset temperature, so that the power setpoint of the three-phase inverter circuit is lower and the heat generation is reduced.

[0108] The second preset temperature can be determined based on actual needs or relevant experiments. For example, it can be 10 degrees, 13 degrees, 15 degrees, etc.

[0109] In some embodiments, the second preset condition includes that the target temperature sensors of at least five arms of the three-phase inverter circuit all report abnormalities. The at least five arms may include upper and lower arms, for example, two upper arms and three lower arms, three upper arms and two lower arms, or three upper arms and three lower arms, etc. Of the at least five arms, there must be two upper and two lower arms of each phase, and the upper and / or lower arm of the remaining phase.

[0110] It should be noted that the target temperature sensor in this embodiment can also be divided into three cases, which can be referred to in the relevant descriptions of the foregoing embodiments, and will not be repeated here.

[0111] The target temperature sensor in this application can be an NTC temperature sensor or other types of temperature sensors.

[0112] It should be understood that the sequence number of each step in the above embodiments does not imply the order of execution. The execution order of each process should be determined by its function and internal logic, and should not constitute any limitation on the implementation process of the embodiments of the present invention.

[0113] The following are device embodiments of the present invention. For details not described in detail, please refer to the corresponding method embodiments described above.

[0114] Figure 3A schematic diagram of the control device for a three-phase inverter circuit provided in an embodiment of the present invention is shown. For ease of explanation, only the parts related to the embodiment of the present invention are shown, and are described in detail below:

[0115] The three-phase inverter circuit includes target temperature sensors for reflecting the device temperatures of the upper and lower bridge arms of each phase; such as... Figure 3 As shown, the control device 30 of the three-phase inverter circuit may include: an acquisition module 31 and a control module 32.

[0116] The acquisition module 31 is used to acquire the target reported data from each target temperature sensor;

[0117] The control module 32 is used to control the target derating curve corresponding to the target temperature sensor to shift to the left by a first preset temperature when the target reported data meets the first preset condition, and control the working state of the three-phase inverter circuit based on the target derating curve after shifting to the left by the first preset temperature, or to increase the highest temperature data in the target reported data of each target temperature sensor by a first preset temperature, and control the working state of the three-phase inverter circuit based on the highest temperature data after increasing the first preset temperature.

[0118] The target derating curve has temperature on the horizontal axis and power derating factor on the vertical axis. The first preset condition is used to indicate that there is an abnormality in the devices of the upper and lower bridge arms of one phase of the three-phase inverter circuit.

[0119] In one possible implementation, the first preset condition includes that the target reported data of the target temperature sensor corresponding to the upper and lower bridge arms of one phase of the three-phase inverter circuit are both abnormal and the inverter current of that phase is greater than a first current threshold, or that the target reported data of the target temperature sensor of any four bridge arms of the three-phase inverter circuit are all abnormal.

[0120] In one possible implementation, the three-phase inverter circuit is provided with a corresponding heat sink; the target temperature sensor includes a first temperature sensor disposed on the upper and lower bridge arms of each phase of the three-phase inverter circuit, and / or a second temperature sensor disposed on the heat sink and corresponding one-to-one with the upper and lower bridge arms of each phase.

[0121] Accordingly, the target reported data of each target temperature sensor includes the first reported data of each first temperature sensor and / or the second reported data of each second temperature sensor.

[0122] The target derating curve corresponding to the target temperature sensor includes the first derating curve corresponding to the first temperature sensor, and / or the second derating curve corresponding to the second temperature sensor.

[0123] In one possible implementation, in control module 32, when the target temperature sensor includes a first temperature sensor and a second temperature sensor:

[0124] When the first reported data and / or the second reported data meet the first preset condition, it is determined that the target reported data meets the first preset condition;

[0125] Accordingly, the target derating curve corresponding to the target temperature sensor is shifted to the left by a first preset temperature, and the operating state of the three-phase inverter circuit is controlled based on the target derating curve after the overall left shift by the first preset temperature, including:

[0126] The first derating curve and the second derating curve are both shifted to the left by a first preset angle. Based on the first derating curve after shifting to the left by a first preset temperature and the second derating curve after shifting to the left by a first preset temperature, the working state of the three-phase inverter circuit is controlled.

[0127] The highest temperature data reported by each target temperature sensor is increased by a first preset temperature, and the operating state of the three-phase inverter circuit is controlled based on the highest temperature data after the first preset temperature increase, including:

[0128] The first maximum temperature data in the first reported data of each first temperature sensor and the second maximum temperature data in the second reported data of each second temperature sensor are all increased by a first preset temperature. Based on the first maximum temperature data after increasing the first preset temperature and the second maximum temperature data after increasing the first preset temperature, the operating state of the three-phase inverter circuit is controlled.

[0129] In one possible implementation, the control module 32 controls the operating state of the three-phase inverter circuit based on a first derating curve shifted left by a first preset temperature and a second derating curve shifted left by a first preset temperature, including:

[0130] Based on the first derating curve after shifting the whole to the left by the first preset temperature, the first derating coefficient corresponding to the first highest temperature data is determined.

[0131] Based on the second derating curve after shifting the whole temperature to the left by the first preset temperature, the second derating coefficient corresponding to the second highest temperature data is determined.

[0132] The operating state of the three-phase inverter circuit is controlled based on the smaller value of the first derating factor and the second derating factor.

[0133] In one possible implementation, the control module 32 controls the operating state of the three-phase inverter circuit based on a first maximum temperature data after increasing the first preset temperature and a second maximum temperature data after increasing the first preset temperature, including:

[0134] Based on the first derating curve, determine the third derating coefficient corresponding to the first maximum temperature data after increasing the first preset temperature;

[0135] Based on the second derating curve, determine the fourth derating coefficient corresponding to the second highest data after increasing the first preset temperature;

[0136] The operating state of the three-phase inverter circuit is controlled based on the smaller value of the third derating factor and the fourth derating factor.

[0137] In one possible implementation, in control module 32, the target derating curve is a piecewise curve, including at least one target piecewise threshold.

[0138] The target derating curve corresponding to the control target temperature sensor is shifted to the left by a first preset temperature, including:

[0139] The threshold values ​​of each target segment of the target derating curve corresponding to the target temperature sensor are all reduced by the first preset temperature.

[0140] In one possible implementation, the control module 32 is further used for:

[0141] When the target reported data meets the second preset condition, the target derating curve corresponding to the target temperature sensor is shifted to the left by the second preset temperature, and the working state of the three-phase inverter circuit is controlled based on the target derating curve after the overall left shift by the second preset temperature; or, the highest temperature data in the target reported data of each target temperature sensor is increased by the second preset temperature, and the working state of the three-phase inverter circuit is controlled based on the highest temperature data after the increase by the second preset temperature; the second preset temperature is greater than the first preset temperature.

[0142] The second preset condition is used to indicate that all three phases of the three-phase inverter circuit have abnormalities.

[0143] In one possible implementation, the second preset condition includes that the target temperature sensors of at least five arms of the three-phase inverter circuit all report abnormalities.

[0144] Corresponding to the control method of the three-phase inverter circuit described above, this embodiment of the invention also provides a three-phase control circuit, including a controller and a target temperature sensor for reflecting the device temperature of the upper and lower bridge arms of each phase; the target temperature sensor is connected to the controller.

[0145] The controller is used to execute any of the control methods for a three-phase inverter circuit as described above.

[0146] Figure 4 This is a schematic diagram of the controller provided in an embodiment of the present invention. Figure 4As shown, the controller 4 in this embodiment includes a processor 40 and a memory 41. The memory 41 stores a computer program 42, and the processor 40 calls and runs the computer program 42 stored in the memory 41 to execute the steps in the control method embodiments of the various three-phase inverter circuits described above, for example... Figure 1 S101 to S102 are shown. Alternatively, the processor 40 is used to call and run the computer program 42 stored in the memory 41 to implement the functions of each module / unit in the above-described device embodiments, for example... Figure 3 The functions of modules / units 31 to 32 shown.

[0147] For example, the computer program 42 can be divided into one or more modules / units, which are stored in the memory 41 and executed by the processor 40 to complete the present invention. The one or more modules / units can be a series of computer program instruction segments capable of performing a specific function, which describe the execution process of the computer program 42 in the controller 4. For example, the computer program 42 can be divided into... Figure 3 Modules / units 31 to 32 are shown.

[0148] The controller 4 may include, but is not limited to, a processor 40 and a memory 41. Those skilled in the art will understand that... Figure 4 This is merely an example of controller 4 and does not constitute a limitation on controller 4. It may include more or fewer components than shown, or combine certain components, or different components. For example, the controller may also include input / output devices, network access devices, buses, etc.

[0149] The processor 40 may be a Central Processing Unit (CPU), or other general-purpose processors, digital signal processors (DSPs), application-specific integrated circuits (ASICs), field-programmable gate arrays (FPGAs), or other programmable logic devices, discrete gate or transistor logic devices, discrete hardware components, etc. A general-purpose processor may be a microprocessor or any conventional processor.

[0150] The memory 41 can be an internal storage unit of the controller 4, such as a hard disk or memory of the controller 4. The memory 41 can also be an external storage device of the controller 4, such as a plug-in hard disk, Smart Media Card (SMC), Secure Digital (SD) card, or Flash Card equipped on the controller 4. Furthermore, the memory 41 can include both internal storage units and external storage devices of the controller 4. The memory 41 is used to store the computer program and other programs and data required by the controller. The memory 41 can also be used to temporarily store data that has been output or will be output.

[0151] Those skilled in the art will clearly understand that, for the sake of convenience and brevity, the above-described division of functional units and modules is merely an example. In practical applications, the above functions can be assigned to different functional units and modules as needed, that is, the internal structure of the device can be divided into different functional units or modules to complete all or part of the functions described above. The functional units and modules in the embodiments can be integrated into one processing unit, or each unit can exist physically separately, or two or more units can be integrated into one unit. The integrated unit can be implemented in hardware or as a software functional unit. Furthermore, the specific names of the functional units and modules are only for easy differentiation and are not intended to limit the scope of protection of this application. The specific working process of the units and modules in the above system can be referred to the corresponding process in the foregoing method embodiments, and will not be repeated here.

[0152] In the above embodiments, the descriptions of each embodiment have different focuses. For parts that are not described in detail or recorded in a certain embodiment, please refer to the relevant descriptions of other embodiments.

[0153] Those skilled in the art will 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, or a combination of computer software and electronic hardware. 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 implementations should not be considered beyond the scope of this invention.

[0154] In the embodiments provided by this invention, it should be understood that the disclosed devices / controllers and methods can be implemented in other ways. For example, the device / controller embodiments described above are merely illustrative. For instance, the division of modules or units is only a logical functional division, and in actual implementation, there may be other division methods. For example, multiple units or components may be combined or integrated into another system, or some features may be ignored or not executed. Furthermore, the coupling or direct coupling or communication connection shown or discussed may be through some interfaces; the indirect coupling or communication connection between devices or units may be electrical, mechanical, or other forms.

[0155] The units described as separate components may or may not be physically separate. The components shown as units may or may not be physical units; that is, they may be located in one place or distributed across multiple network units. Some or all of the units can be selected to achieve the purpose of this embodiment according to actual needs.

[0156] Furthermore, the functional units in the various embodiments of the present invention can be integrated into one processing unit, or each unit can exist physically separately, or two or more units can be integrated into one unit. The integrated unit can be implemented in hardware or as a software functional unit.

[0157] If the integrated module / unit is implemented as a software functional unit and sold or used as an independent product, it can be stored in a computer-readable storage medium. Based on this understanding, all or part of the processes in the above embodiments of the present invention can also be implemented by a computer program instructing related hardware. The computer program can be stored in a computer-readable storage medium, and when executed by a processor, it can implement the steps of the control method embodiments of the various three-phase inverter circuits described above. The computer program includes computer program code, which can be in the form of source code, object code, executable files, or certain intermediate forms. The computer-readable medium can include: any entity or device capable of carrying the computer program code, a recording medium, a USB flash drive, a portable hard drive, a magnetic disk, an optical disk, a computer memory, a read-only memory (ROM), a random access memory (RAM), an electrical carrier signal, a telecommunication signal, and a software distribution medium, etc.

[0158] The above-described embodiments are only used to illustrate the technical solutions of the present invention, and are not intended to limit it. Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of the present invention, and should all be included within the protection scope of the present invention.

Claims

1. A control method of a three-phase inverter circuit, characterized by, The three-phase inverter circuit comprises target temperature sensors for reflecting temperatures of upper and lower bridge arms of each phase; and a control method of the three-phase inverter circuit comprises: acquiring target report data of each target temperature sensor; when the target report data meets a first preset condition, controlling a target derating curve corresponding to the target temperature sensor to move left by a first preset temperature as a whole, and controlling an operating state of the three-phase inverter circuit based on the target derating curve after moving left by the first preset temperature, or increasing a highest temperature data in the target report data of each target temperature sensor by the first preset temperature, and controlling the operating state of the three-phase inverter circuit based on the highest temperature data after increasing by the first preset temperature; wherein the target derating curve takes temperature as abscissa and takes a derating coefficient of power as ordinate; and the first preset condition is used to indicate that there are abnormalities in devices of upper and lower bridge arms of one phase of the three-phase inverter circuit; the three-phase inverter circuit is provided with a corresponding radiator; and the target temperature sensor comprises first temperature sensors arranged on upper and lower bridge arms of each phase of the three-phase inverter circuit, and / or second temperature sensors arranged on the radiator and corresponding to the upper and lower bridge arms of each phase one by one; correspondingly, the target report data of each target temperature sensor comprises first report data of each first temperature sensor, and / or second report data of each second temperature sensor; the target derating curve corresponding to the target temperature sensor comprises a first derating curve corresponding to the first temperature sensor, and / or a second derating curve corresponding to the second temperature sensor; when the target temperature sensor comprises the first temperature sensor and the second temperature sensor: when the first report data and / or the second report data meet the first preset condition, it is determined that the target report data meets the first preset condition; correspondingly, the control of the target derating curve corresponding to the target temperature sensor to move left by the first preset temperature as a whole, and the control of the operating state of the three-phase inverter circuit based on the target derating curve after moving left by the first preset temperature as a whole, comprise: controlling the first derating curve and the second derating curve to move left by the first preset angle as a whole, and controlling the operating state of the three-phase inverter circuit based on the first derating curve after moving left by the first preset temperature as a whole and the second derating curve after moving left by the first preset temperature as a whole; the increasing of the highest temperature data in the target report data of each target temperature sensor by the first preset temperature, and the control of the operating state of the three-phase inverter circuit based on the highest temperature data after increasing by the first preset temperature, comprise: increasing a first highest temperature data in the first report data of each first temperature sensor and a second highest temperature data in the second report data of each second temperature sensor by the first preset temperature, and controlling the operating state of the three-phase inverter circuit based on the first highest temperature data after increasing by the first preset temperature and the second highest temperature data after increasing by the first preset temperature.

2. The control method of a three-phase inverter circuit according to claim 1, characterized by, The first preset condition comprises that target report data of target temperature sensors corresponding to upper and lower bridge arms of one phase of the three-phase inverter circuit are both abnormal and that inverter current of the phase is greater than a first current threshold, or that target report data of target temperature sensors of any four bridge arms of the three-phase inverter circuit are all abnormal.

3. The control method of a three-phase inverter circuit according to claim 1, characterized by, The working state of the three-phase inverter circuit is controlled based on the first derating curve after the overall left shift of the first preset temperature and the second derating curve after the overall left shift of the first preset temperature, comprising: A first derating coefficient corresponding to the first highest temperature data is determined based on the first derating curve after the overall left shift of the first preset temperature; A second derating coefficient corresponding to the second highest temperature data is determined based on the second derating curve after the overall left shift of the first preset temperature; The working state of the three-phase inverter circuit is controlled based on the smaller one of the first derating coefficient and the second derating coefficient.

4. The control method of a three-phase inverter circuit according to claim 1, characterized by, The working state of the three-phase inverter circuit is controlled based on the first highest temperature data after the increase of the first preset temperature and the second highest data after the increase of the first preset temperature, comprising: A third derating coefficient corresponding to the first highest temperature data after the increase of the first preset temperature is determined based on the first derating curve; A fourth derating coefficient corresponding to the second highest data after the increase of the first preset temperature is determined based on the second derating curve; The working state of the three-phase inverter circuit is controlled based on the smaller one of the third derating coefficient and the fourth derating coefficient.

5. The control method of a three-phase inverter circuit according to claim 1, characterized by, The target derating curve is a segmented curve comprising at least one target segmented threshold; The target temperature sensor corresponding target derating curve is controlled to be overall left shifted by a first preset temperature, comprising: Each target segmented threshold of the target temperature sensor corresponding target derating curve is controlled to be decreased by the first preset temperature.

6. The control method of a three-phase inverter circuit according to any one of claims 1 to 5, characterized by, After the target report data of each target temperature sensor is acquired, the control method of the three-phase inverter circuit further comprises: When the target report data satisfies a second preset condition, the target temperature sensor corresponding target derating curve is controlled to be overall left shifted by a second preset temperature, and the working state of the three-phase inverter circuit is controlled based on the target derating curve after the overall left shift of the second preset temperature, or the highest temperature data in the target report data of each target temperature sensor is increased by the second preset temperature, and the working state of the three-phase inverter circuit is controlled based on the highest temperature data after the increase of the second preset temperature; the second preset temperature is greater than the first preset temperature; The second preset condition is used to indicate that devices of three phases of the three-phase inverter circuit are all abnormal.

7. The control method of a three-phase inverter circuit according to claim 6, characterized by, The second preset condition comprises that target report data of target temperature sensors of at least five bridge arms of the three-phase inverter circuit are all abnormal.

8. A three-phase inverter circuit, characterized by A controller and target temperature sensors for reflecting device temperatures of upper and lower bridge arms of each phase are comprised; The target temperature sensors are connected with the controller; The controller is used to execute the control method of the three-phase inverter circuit according to any one of claims 1 to 7.

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