A control method, device, system and storage medium

Abstract

The present application discloses a control method, comprising: if a target type fault is detected, determining a first control signal for instructing a first load connected to a three-phase, three-level power supply circuit to stop operating; wherein the first load is connected to a busbar of the three-phase, three-level power supply circuit, and the target type fault is associated with a second load connected to two busbars of the three-phase, three-level power supply circuit; and transmitting the first control signal to a second control device via a target communication channel; wherein the first control signal is used to instruct the second control device to control the first load to stop operating. The present application also discloses a first control device, a system, and a storage medium.

Description

Technical Field

[0001] The present application relates to the field of power supply detection technology, and in particular to a control method, device, system and storage medium. Background Art

[0002] In three-phase power supply applications, such as air conditioning systems, the three-phase power supply circuit can provide operating voltage for the variable-frequency compressor through full bus load and for the DC fan through half bus load. Currently, if both full and half bus loads are operating, if the full bus load suddenly fails, the half bus load cannot be stopped in time, causing a significant shift in the midpoint potential of the capacitors in the operating circuit. This can easily lead to overvoltage in the capacitors and further damage to the storage capacitors.

[0003] However, there is currently no reliable and effective control method for the above situation, resulting in low control efficiency and a high failure rate of the power supply control circuit.

[0004] Application Contents

[0005] In order to solve the above technical problems, the embodiments of the present application hope to provide a control method, circuit, system and equipment, which solves the current problem that when the full bus load suddenly fails, the half bus load cannot be quickly and timely controlled to stop working, and realizes a control method for quickly and timely controlling the half bus load to stop working, effectively reducing the probability of damage caused by overvoltage of the energy storage capacitor in the three-phase power supply circuit, improving the control efficiency of the three-phase four-wire power supply circuit, and reducing the failure rate of the power supply control circuit.

[0006] The technical solution of this application is achieved as follows:

[0007] In a first aspect, a control method is provided, the control method being applied to a first control device for managing a three-phase three-level power supply circuit, the method comprising:

[0008] If a target type fault is detected, determining a first control signal for instructing a first load connected to the three-phase three-level power supply circuit to stop operating; wherein the first load is connected to one busbar of the three-phase three-level power supply circuit, and the target type fault is associated with a second load connected to two busbars of the three-phase three-level power supply circuit;

[0009] The first control signal is sent to a second control device through a target communication channel; wherein the first control signal is used to instruct the second control device to control the first load to stop working.

[0010] In a second aspect, a first control device is provided, comprising: a processor and a target communication channel; wherein:

[0011] The processor is configured to implement the following steps: if a target type fault is detected, determining a first control signal for instructing a first load connected to the three-phase three-level power supply circuit to stop operating; wherein the first load is connected to a busbar of the three-phase three-level power supply circuit, and the target type fault is associated with a second load connected to two busbars of the three-phase three-level power supply circuit;

[0012] The target communication channel is used to communicate with the second control device and transmit the first control signal to the second control device; wherein the first control signal is used to instruct the second control device to control the second load to stop working.

[0013] In a third aspect, a control system is provided, comprising: a three-phase three-level power supply circuit, a first load, a second load, a first control device, and a second control device; wherein:

[0014] The three-phase three-level power supply circuit is configured to rectify an input AC power signal to obtain a DC power signal, and provide operating power to the first load connected to one busbar of the three-phase three-level power supply circuit, the second load connected to two busbars of the three-phase three-level power supply circuit, the first control device, and the second control device;

[0015] The first control device is configured to monitor the three-phase three-level power supply circuit and the first load to implement the steps of any one of the control methods described above;

[0016] The second control device is used to manage and control the second load.

[0017] In a fourth aspect, an air-conditioning device includes the control system described above; wherein, the first load is a DC fan load, and the second load is a compressor load.

[0018] In a fifth aspect, a storage medium is provided, wherein a control program is stored on the storage medium, and when the control program is executed by a processor, the steps of the control method as described in any one of the above items are implemented.

[0019] In an embodiment of the present application, when the first control device detects a target type fault, it determines a first control signal for instructing the first load connected to the three-phase three-level power supply circuit to stop working, and sends the first control signal to the second control device through the target communication channel. In this way, the first control device sends the first control signal for instructing the first load to stop working to the second control device through the target communication channel, so that the second control device controls the first load to stop working, solving the current problem of not being able to quickly and timely control the half-bus load to stop working when a sudden fault occurs in the full bus load, realizing a control method for quickly and timely controlling the half-bus load to stop working, effectively reducing the probability of damage caused by overvoltage of the energy storage capacitor in the three-phase power supply circuit, improving the control efficiency of the three-phase four-wire power supply circuit, and reducing the failure rate of the power supply control circuit. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 Schematic diagram of the control method provided in this embodiment Figure 1 ;

[0021] Figure 2 Schematic diagram of the control method provided in this embodiment Figure 2 ;

[0022] Figure 3 A schematic diagram of a three-phase three-level power supply circuit provided in an embodiment of the present application;

[0023] Figure 4 A circuit connection diagram of a control system provided in an embodiment of the present application;

[0024] Figure 5 A circuit connection diagram of another control system provided in an embodiment of the present application;

[0025] Figure 6 Schematic diagram of the control method provided in this embodiment Figure 3 ;

[0026] Figure 7 A schematic diagram of a timing change provided in an embodiment of the present application;

[0027] Figure 8 Schematic diagram of the control method provided in this embodiment Figure 4 ;

[0028] Figure 9 Schematic diagram of the control method provided in this embodiment Figure 5 ;

[0029] Figure 10 A schematic structural diagram of a first control device provided in an embodiment of the present application;

[0030] Figure 11 A schematic diagram of the structure of a control system provided in an embodiment of the present application. DETAILED DESCRIPTION

[0031] The technical solutions in the embodiments of the present application will be described clearly and completely below in conjunction with the drawings in the embodiments of the present application.

[0032] The embodiment of the present application provides a control method, referring to Figure 1 As shown, the method is applied to a first control device for managing a three-phase three-level power supply circuit, and the method includes the following steps:

[0033] Step 101: If a target type fault is detected, determine a first control signal for instructing a first load connected to a three-phase three-level power supply circuit to stop operating.

[0034] The first load is connected to a busbar of a three-phase three-level power supply circuit, and the target type fault is associated with a second load connected to two busbars of the three-phase three-level power supply circuit.

[0035] In this embodiment of the present application, a target type fault refers to a fault that may cause overvoltage or damage to an energy storage capacitor in a three-phase, three-level power supply circuit. The first load may be a half-bus load, i.e., the first load is powered by a single bus in the three-phase, three-level power supply circuit. When a target type fault is detected, a first control signal is immediately generated to stop the first load.

[0036] Step 102: Send a first control signal to a second control device through a target communication channel.

[0037] The first control signal is used to instruct the second control device to control the first load to stop working.

[0038] In the embodiment of the present application, the target communication channel is a specific channel used to transmit the first control signal. It can be an existing communication channel between the first control device and the second control device, or a dedicated communication channel set up specifically for transmitting the first control signal. Thus, after receiving the first control signal, the second control device controls the first load to stop operating in response to the first control signal.

[0039] In an embodiment of the present application, when the first control device detects a target type fault, it determines a first control signal for instructing the first load connected to the three-phase three-level power supply circuit to stop working, and sends the first control signal to the second control device through the target communication channel. In this way, the first control device sends the first control signal for instructing the first load to stop working to the second control device through the target communication channel, so that the second control device controls the first load to stop working, solving the current problem of not being able to quickly and timely control the half-bus load to stop working when a sudden fault occurs in the full bus load, realizing a control method for quickly and timely controlling the half-bus load to stop working, effectively reducing the probability of damage caused by overvoltage of the energy storage capacitor in the three-phase power supply circuit, improving the control efficiency of the three-phase four-wire power supply circuit, and reducing the failure rate of the power supply control circuit.

[0040] Based on the above embodiments, the embodiments of the present application provide a control method, referring to Figure 2 As shown, the method is applied to a first control device for managing a three-phase three-level power supply circuit, and the method includes the following steps:

[0041] Step 201: If it is monitored that a shutdown fault occurs in the second load and / or an overvoltage fault occurs in the first capacitor, a first control signal is determined for instructing a first load connected to the three-phase three-level power supply circuit to stop operating.

[0042] The first load is connected to a busbar of a three-phase three-level power supply circuit, the target type fault is associated with a second load connected to two busbars of the three-phase three-level power supply circuit, and the first capacitor is an energy storage capacitor in the three-phase three-level power supply circuit excluding the second capacitor connected in parallel with the first load.

[0043] In the embodiments of the present application, a shutdown fault of the second load refers to a sudden shutdown of the second load during normal operation, and an overvoltage fault of the first capacitor refers to a situation where the voltage of the first capacitor is high and exceeds the maximum tolerance of the first capacitor. Because a shutdown fault of the first load and / or an overvoltage fault of the first capacitor can both cause overvoltage or damage to the second capacitor, in order to protect the second capacitor, the first load connected in parallel with the second capacitor must be quickly shut down, thereby causing the first load to stop consuming the voltage corresponding to the second capacitor, thereby ensuring that the second capacitor does not experience overvoltage or damage.

[0044] Step 202: Send a first control signal to a second control device through a target communication channel.

[0045] The first control signal is used to instruct the second control device to control the first load to stop working.

[0046] In an embodiment of the present application, the first control device quickly sends the generated first control signal to the second control device through the target communication channel between the first control device and the second control device, so that the second control device quickly responds to the first control signal to control the first load to stop working.

[0047] It should be noted that the target communication channel includes a wired communication channel or a wireless communication channel, wherein the wireless communication channel can be implemented by providing matching wireless communication modules in the first control device and the second control device.

[0048] Based on the above embodiment, the circuit diagram of the three-phase three-level power supply circuit can be referred to Figure 3 As shown, the power supply specifically includes an AC input terminal 31, an inductor module 32, a rectifier module 33, and an energy storage module 34. The AC input terminal 31 includes a first-phase AC input terminal A, a second-phase AC input terminal B, and a third-phase AC input terminal C. The AC input terminal 31 receives AC power from an external AC source. The inductor module 32 includes three inductors L1, L2, and L3. The rectifier module 33 includes six diodes D1, D2, D3, D4, D5, and D6, and six bidirectional switches T1, T2, T3, T4, T5, and T6. The energy storage module 34 includes two capacitors C1 and C2, and busbars E1 and E2. The inductor module 32 transmits the AC voltage signal input from the AC input terminal 31 to the rectifier module 33. The rectifier module 33 rectifies the received AC voltage signal to generate a DC signal, which is then stored in the energy storage module 34.

[0049] The circuit connection diagram between the three-phase three-level power supply circuit, the first control device, the second control device, the first load and the second load can be referred to Figure 4 or Figure 5 As shown, the first load is connected in parallel with capacitor C1, and the second load is connected in parallel with capacitors C1 and C2. The three-phase three-level power supply circuit provides a DC voltage for the first load and the second load. The first control device is used to monitor the three-phase three-level power supply circuit, manage and control the operating parameters of the second load, and control the operating parameters of the first load by controlling the second control device. Figure 4 It is shown that there is only one communication path F1 between the first control device and the second control device. Figure 5 It is shown that there are two communication paths F2 and F3 between the first control device and the second control device. Figure 5 In the example, it is assumed that the communication path F2 is a dedicated channel for transmitting the first control signal, and the corresponding communication path F3 is used to transmit the second control signal sent by the first control device to the second control device to control the operating parameters of the first load. Figure 4 and Figure 5In the embodiment, capacitor C1 is the aforementioned first capacitor, and capacitor C2 is the aforementioned second capacitor.

[0050] In this way, the first control signal is sent to the second control device through the target communication channel, which effectively improves the transmission efficiency of the first control signal, ensures that the second control device can quickly receive the first control signal, and respond to the first control signal to control the first load to stop working, so that the first capacitor will not be overvoltage or damaged.

[0051] It should be noted that, for the description of the same steps and contents in this embodiment as those in other embodiments, reference can be made to the description in other embodiments and will not be repeated here.

[0052] In an embodiment of the present application, when the first control device detects a target type fault, it determines a first control signal for instructing the first load connected to the three-phase three-level power supply circuit to stop working, and sends the first control signal to the second control device through the target communication channel. In this way, the first control device sends the first control signal for instructing the first load to stop working to the second control device through the target communication channel, so that the second control device controls the first load to stop working, solving the current problem of not being able to quickly and timely control the half-bus load to stop working when a sudden fault occurs in the full bus load, realizing a control method for quickly and timely controlling the half-bus load to stop working, effectively reducing the probability of damage caused by overvoltage of the energy storage capacitor in the three-phase power supply circuit, improving the control efficiency of the three-phase four-wire power supply circuit, and reducing the failure rate of the power supply control circuit.

[0053] Based on the above embodiments, the embodiments of the present application provide a control method, referring to Figure 6 As shown, the method is applied to a first control device for managing a three-phase three-level power supply circuit. The first control device and the second control device include a transmission channel for transmitting a second control signal and a target communication channel. The second control signal is a parameter used by the first control device to control an operating parameter of a first load. The method includes the following steps:

[0054] Step 401: If it is monitored that a shutdown fault occurs in the second load and / or an overvoltage fault occurs in the first capacitor, a first control signal is determined for instructing a first load connected to the three-phase three-level power supply circuit to stop operating.

[0055] The first load is connected to a busbar of a three-phase three-level power supply circuit, the target type fault is associated with a second load connected to two busbars of the three-phase three-level power supply circuit, and the first capacitor is an energy storage capacitor in the three-phase three-level power supply circuit excluding the second capacitor connected in parallel with the first load.

[0056] Step 402: If the first control signal is in the form of a data frame, send the first control signal to the second control device through the target communication channel at a preset time interval.

[0057] Among them, the preset time interval is less than the time length when the minimum operating voltage required by the first load is reduced to the minimum voltage allowed by the second capacitor in parallel with the first load when the first load is maximum, and the first control signal is used to instruct the second control device to control the first load to stop working.

[0058] In the embodiment of this application, based on Figure 5 In the connection circuit diagram shown, when at least two communication channels F2 and F3 are provided between the first control device and the second control device, the first control signal in the form of a data frame can be transmitted to the second control device via one of the target communication channels F2, which is used solely for transmitting the first control signal, and the target communication channel F2 transmits the first control signal at a higher frequency. The preset time interval can be an empirical value obtained through extensive experimentation that is less than the duration for the minimum operating voltage required by the first load to drop to the minimum allowable voltage of the second capacitor connected in parallel with the first load when the first load is at its maximum, or it can be a value set by the user based on the duration for the minimum operating voltage required by the first load to drop to the minimum allowable voltage of the second capacitor connected in parallel with the first load when the first load is at its maximum.

[0059] The first control device and the second control device may both be a control chip, such as a microcontroller unit (MCU).

[0060] In other embodiments of the present application, the first control signal may further include one of the following forms: a high or low level signal form and a voltage signal form.

[0061] In an embodiment of the present application, the first control signal generated by the first control device may be in the form of a data frame and may also be at least one high-level and low-level signal. For example, taking the high level as 1 and the low level as 0 as an example, the first control device outputs a continuous high-low regularly changing level of 1010... and sends it to the second control device through the target communication channel. When the second control device receives the regularly changing level, it immediately controls the first load to stop working.

[0062] The voltage signal may be in the form of a voltage threshold. For example, when the second load, the second capacitor and the first load are all operating normally, the first control device may continuously output a high voltage threshold signal, such as a 4 volt (V) voltage signal, through the target communication channel. When the first control device detects that the second load has a shutdown fault and / or the first capacitor has an overvoltage fault, the first control device changes the voltage signal output from the target communication channel into a low voltage threshold signal, such as a 1V voltage signal. In this way, when the second control device receives the 1V voltage signal, it immediately controls the first load to stop working.

[0063] It should be noted that the target communication channel includes a wired communication channel or a wireless communication channel.

[0064] The first control signal may be sent from the first control device to the second control device in a wired or wireless signal form.

[0065] In this way, a separate newly added target communication channel is used to transmit various forms of first control signals, which effectively ensures the efficiency of transmitting the first control signal and enables the first control signal to be quickly transmitted to the second control device so that the second control device can quickly control the first load to stop working, thereby effectively protecting the first capacitor.

[0066] Based on the aforementioned embodiment, an embodiment of the present application provides an application embodiment, which includes: a three-level rectifier circuit, namely the aforementioned three-phase three-level power supply circuit, a full bus load, namely the aforementioned second load, a half bus load, namely the aforementioned first load, a controller 1, namely the aforementioned first control device, and a controller 2, namely the aforementioned second control device; wherein, the controller 1 controls the full bus load and the three-level rectifier circuit, and the controller 2 controls the half bus load under the control of the controller 1.

[0067] Two communication lines 1 and 2 are provided between controllers 1 and 2. Communication line 1 is a newly added communication line between controllers 1 and 2, i.e., the aforementioned target communication channel. When data frames, i.e., the aforementioned first control signal, are transmitted on communication line 1, the time difference between adjacent transmitted data frames is less than time interval 1; this time interval is less than the time required for the half-bus voltage to drop from the minimum controlled half-bus voltage to the minimum allowable voltage when the half-bus load is maximum.

[0068] Communication line 1 is only used to transmit signals for controlling the on and off of the half-bus load, such as the aforementioned first control signal for controlling the half-bus load to stop working. Communication line 1 can be composed of one or more communication lines. The first control signal is composed of one or a group of high and low levels, or the first control signal can be represented by two voltages or distinguished by two voltage thresholds. For example, when the first control signal is less than 1V, it indicates that the half-bus load needs to be controlled to stop working. Communication line 1 can be wireless communication. In some application scenarios, communication line 2 is used to transmit other information such as speed control and speed feedback for controlling the half-bus load.

[0069] The corresponding working sequence diagrams between communication line 1, communication line 2, full bus load and half bus load can be referred to Figure 7 As shown, when the full bus load has a shutdown fault at time t1, the timing of sending the second control signal in the communication line 2 in the first control device does not change. The first control device generates the first control signal at time t2 and sends the first control signal to the second control device at time t2. When the second control device receives the first control signal at time t3, it controls the half bus load to stop working.

[0070] It should be noted that, for the description of the same steps and contents in this embodiment as those in other embodiments, reference can be made to the description in other embodiments and will not be repeated here.

[0071] In an embodiment of the present application, when the first control device detects a target type fault, it determines a first control signal for instructing the first load connected to the three-phase three-level power supply circuit to stop working, and sends the first control signal to the second control device through the target communication channel. In this way, the first control device sends the first control signal for instructing the first load to stop working to the second control device through the target communication channel, so that the second control device controls the first load to stop working, solving the current problem of not being able to quickly and timely control the half-bus load to stop working when a sudden fault occurs in the full bus load, realizing a control method for quickly and timely controlling the half-bus load to stop working, effectively reducing the probability of damage caused by overvoltage of the energy storage capacitor in the three-phase power supply circuit, improving the control efficiency of the three-phase four-wire power supply circuit, and reducing the failure rate of the power supply control circuit.

[0072] Based on the above embodiments, the embodiments of the present application provide a control method, referring to Figure 8 As shown, the method is applied to a first control device that manages a three-phase three-level power supply circuit, and the target communication channel is also used to transmit operating parameters of the first control device for controlling a first load. The method includes the following steps:

[0073] Step 501: If a target type fault is detected, a first control signal in the form of a data frame is generated based on the operating parameters of a first control device for controlling a first load and target identification information.

[0074] Among them, the target identification information is used to instruct the second control device to control the second load to stop working, and the target type fault includes at least one of the following faults: a shutdown fault of the second load and an overvoltage fault of the first capacitor, and the first capacitor is an energy storage capacitor in the three-phase three-level power supply circuit except the second capacitor connected in parallel with the first load.

[0075] In the embodiment of this application, based on Figure 4 In the circuit connection diagram shown, there is only one communication channel F1 for communication between the first control device and the second control device, and when the first control device and the second control device communicate via data frames, if the first control device detects that the second load and the first capacitor are not faulty, that is, they are operating normally, the first control device generates a second control signal based on the operating parameters of the first load, and sends the second control signal to the second control device through the target communication channel at a certain data frame sending frequency, so that the second control device controls the operating parameters of the first load based on the operating parameters indicated by the second control signal. If the first control device detects that the second load has a shutdown fault and / or the first capacitor has an overvoltage fault, the first control device generates a first control signal in the form of a data frame based on the operating parameters of the first load and the target identification information. A specific implementation method can be that when the first control device generates the second control signal based on the operating parameters of the first load, the target identification information is added to the header or other position of the data frame of the second control signal to achieve sending the target identification information to the second control device.

[0076] Step 502: Send the first control signal to the second control device through the target communication channel with a preset duration as the communication interval for sending the first control signal.

[0077] Among them, the preset time length is less than the time length when the minimum operating voltage required by the first load is reduced to the minimum voltage allowed by the second capacitor in parallel with the first load when the first load is at its maximum, and the first control signal is used to instruct the second control device to control the first load to stop working.

[0078] In an embodiment of the present application, the preset duration is an empirical value obtained based on a large number of experiments that is less than the duration of time required for the minimum operating voltage of the first load to drop to the minimum voltage allowed by the second capacitor connected in parallel with the first load when the first load is at its maximum. The preset duration can also be a duration value determined by the user based on the duration of time required for the minimum operating voltage of the first load to drop to the minimum voltage allowed by the second capacitor connected in parallel with the first load when the first load is at its maximum. The preset duration is less than the sending interval of the second control signal sent by the first control device. In this way, the first control device can quickly send the first control signal to the second control device, so that the second control device can quickly control the first load to stop working, and balance the voltage between the first capacitor and the second capacitor before the second capacitor is overvoltage or damaged.

[0079] It should be noted that the target communication channel includes a wired communication channel or a wireless communication channel.

[0080] In this way, the first control signal can be quickly transmitted to the second control device through the target communication channel and by reducing the transmission interval, so that the second control device can quickly control the first load to stop working, thereby effectively protecting the first capacitor.

[0081] Based on the aforementioned embodiment, an embodiment of the present application provides an application embodiment, which includes: a three-level rectifier circuit, namely the aforementioned three-phase three-level power supply circuit, a full bus load, namely the aforementioned second load, a half bus load, namely the aforementioned first load, a controller 1, namely the aforementioned first control device, and a controller 2, namely the aforementioned second control device; wherein the controller 1 controls the full bus load and the three-level rectifier circuit, and the controller 2 controls the half bus load under the control of the controller 1.

[0082] There is only one communication line 3 between controllers 1 and 2. Thus, the target identification information, the instruction information for instructing the half-bus load to stop operating, is embedded in the header or elsewhere of each signal frame indicating the operating parameters of the first load, the second control signal, thereby generating the aforementioned first control signal. Controller 1 transmits the first control signal to controller 2 via communication line 3 at a high baud rate and a short communication frame interval, ensuring that the time required for controller 1 to transmit the longest frame is less than the time required for the half-bus voltage to drop from the minimum controlled half-bus voltage to the minimum allowable voltage when the half-bus load is at maximum.

[0083] It should be noted that, for the description of the same steps and contents in this embodiment as those in other embodiments, reference can be made to the description in other embodiments and will not be repeated here.

[0084] In an embodiment of the present application, when the first control device detects a target type fault, it determines a first control signal for instructing the first load connected to the three-phase three-level power supply circuit to stop working, and sends the first control signal to the second control device through the target communication channel. In this way, the first control device sends the first control signal for instructing the first load to stop working to the second control device through the target communication channel, so that the second control device controls the first load to stop working, solving the current problem of not being able to quickly and timely control the half-bus load to stop working when a sudden fault occurs in the full bus load, realizing a control method for quickly and timely controlling the half-bus load to stop working, effectively reducing the probability of damage caused by overvoltage of the energy storage capacitor in the three-phase power supply circuit, improving the control efficiency of the three-phase four-wire power supply circuit, and reducing the failure rate of the power supply control circuit.

[0085] Based on the above embodiments, the embodiments of the present application provide a control method, referring to Figure 9 As shown, the method is applied to a first control device that manages a three-phase three-level power supply circuit, and the target communication channel is also used to transmit operating parameters of the first control device for controlling a first load. The method includes the following steps:

[0086] Step 601: If a target type fault is detected, a first control signal in the form of a data frame is generated based on target identification information.

[0087] Among them, the target identification information is used to instruct the second control device to control the second load to stop working, and the target type fault includes at least one of the following faults: a shutdown fault of the second load and an overvoltage fault of the first capacitor, and the first capacitor is an energy storage capacitor in the three-phase three-level power supply circuit except the second capacitor connected in parallel with the first load.

[0088] In the embodiment of this application, based on Figure 4 In the circuit connection diagram shown, there is only one communication channel F1 for communication between the first control device and the second control device, and when the first control device and the second control device communicate via data frames, if the first control device detects that the second load and the first capacitor are not faulty, that is, operating normally, the first control device generates a second control signal based on the operating parameters of the first load, and sends the second control signal to the second control device via the target communication channel at a certain data frame transmission frequency, so that the second control device controls the operating parameters of the first load based on the operating parameters indicated by the second control signal. If the first control device detects that the second load has a shutdown fault and / or the first capacitor has an overvoltage fault, the first control device generates a first control signal containing only the target identification information based on the target identification information, that is, the first control device generates a separate control signal for instructing the second control device to control the first load to stop operating.

[0089] Step 602: Based on the priority order of the first control signal and the second control signal, suspend sending the second control signal through the target communication channel.

[0090] The sending priority of the first control signal is higher than the sending priority of the second control signal.

[0091] In an embodiment of the present application, the sending priority of the first control signal is set to the highest. When the first control device generates the first control signal, the second control signal sent by the target communication channel is paused because the first control signal has the highest priority.

[0092] Step 603: Send the first control signal to the second control device through the target communication channel with a preset duration as the communication interval for sending the first control signal.

[0093] Among them, the preset time interval is less than the time length when the minimum operating voltage required by the first load is reduced to the minimum voltage allowed by the second capacitor in parallel with the first load when the first load is maximum, and the first control signal is used to instruct the second control device to control the first load to stop working.

[0094] In an embodiment of the present application, after the first control device suspends sending the second control signal, it sends the first control signal to the second control device through the target communication channel according to a preset communication interval.

[0095] It should be noted that the target communication channel includes a wired communication channel or a wireless communication channel.

[0096] In this way, the first control signal can be quickly transmitted to the second control device through the target communication channel and by reducing the transmission interval, so that the second control device can quickly control the first load to stop working, thereby effectively protecting the first capacitor.

[0097] Based on the aforementioned embodiment, an embodiment of the present application provides an application embodiment, which includes: a three-level rectifier circuit, namely the aforementioned three-phase three-level power supply circuit, a full bus load, namely the aforementioned second load, a half bus load, namely the aforementioned first load, a controller 1, namely the aforementioned first control device, and a controller 2, namely the aforementioned second control device; wherein, the controller 1 controls the full bus load and the three-level rectifier circuit, and the controller 2 controls the half bus load under the control of the controller 1.

[0098] There is only one communication line 3 between controllers 1 and 2. Thus, based on the instruction information for instructing the half-bus load to stop operating, namely the aforementioned target identification information, a target signal frame, namely the aforementioned first control signal, is generated. Controller 1 interrupts the second control signal currently being transmitted on communication line 3 and transmits the target signal frame to controller 2 via communication line 3 at a high baud rate and a short communication frame interval. The maximum frame transmission time of controller 1 is less than the time required for the half-bus voltage to drop from the minimum controlled half-bus voltage to the minimum allowable voltage when the half-bus load is at maximum.

[0099] It should be noted that, for the description of the same steps and contents in this embodiment as those in other embodiments, reference can be made to the description in other embodiments and will not be repeated here.

[0100] In an embodiment of the present application, when the first control device detects a target type fault, it determines a first control signal for instructing the first load connected to the three-phase three-level power supply circuit to stop working, and sends the first control signal to the second control device through the target communication channel. In this way, the first control device sends the first control signal for instructing the first load to stop working to the second control device through the target communication channel, so that the second control device controls the first load to stop working, solving the current problem of not being able to quickly and timely control the half-bus load to stop working when a sudden fault occurs in the full bus load, realizing a control method for quickly and timely controlling the half-bus load to stop working, effectively reducing the probability of damage caused by overvoltage of the energy storage capacitor in the three-phase power supply circuit, improving the control efficiency of the three-phase four-wire power supply circuit, and reducing the failure rate of the power supply control circuit.

[0101] Based on the above embodiments, the embodiment of the present application provides a first control device, referring to Figure 10 As shown, the first control device 7 may include: a processor 71 and a target communication channel 72; wherein:

[0102] The processor 71 is configured to implement the following steps: if a target type fault is detected, determining a first control signal for instructing a first load connected to the three-phase three-level power supply circuit to stop operating; wherein the first load is connected to one bus of the three-phase three-level power supply circuit, and the target type fault is associated with a second load connected to two busbars of the three-phase three-level power supply circuit;

[0103] The target communication channel 72 is used to communicate with the second control device and transmit the first control signal to the second control device; wherein the first control signal is used to instruct the second control device to control the second load to stop working.

[0104] In other embodiments of the present application, the target type fault includes at least one of the following faults: a shutdown fault of the second load and an overvoltage fault of the first capacitor; wherein the first capacitor is an energy storage capacitor in the three-phase three-level power supply circuit except the second capacitor connected in parallel with the first load.

[0105] In other embodiments of the present application, a transmission channel and a target communication channel for transmitting a second control signal are provided between the first control device and the second control device. The second control signal includes an operating parameter of the first control device for controlling the first load. When the processor executes the step of sending the first control signal to the second control device through the target communication channel, the step can be implemented by the following steps:

[0106] If the first control signal is in the form of a data frame, the first control signal is sent to the second control device through the target communication channel at a preset time interval; wherein the preset time interval is less than the length of time it takes for the minimum operating voltage required by the first load to drop to the minimum voltage allowed by the second capacitor connected in parallel with the first load when the first load is at its maximum.

[0107] In other embodiments of the present application, the first control device and the second control device include a transmission channel and a target communication channel for transmitting a second control signal, the second control signal includes an operating parameter of the first control device for controlling the first load, and the first control signal also includes one of the following forms: high and low level signal form and voltage signal form.

[0108] In other embodiments of the present application, when the processor executes the step of detecting a target type fault and determining a first control signal for instructing a first load connected to the three-phase three-level power supply circuit to stop working, the following steps may be performed:

[0109] If a target type fault is detected, a first control signal in the form of a data frame is generated based on the operating parameters of the first control device for controlling the first load and the target identification information; wherein the target identification information is used to instruct the second control device to control the second load to stop working;

[0110] Correspondingly, the target communication channel is also used to transmit the operating parameters of the first control device for controlling the first load. When the processor executes the step of sending the first control signal to the second control device through the target communication channel, it can be implemented by the following steps:

[0111] The first control signal is sent to the second control device through the target communication channel with a preset duration as the communication interval for sending the first control signal.

[0112] In other embodiments of the present application, when the processor executes the step of detecting a target type fault and determining a first control signal for instructing a first load connected to the three-phase three-level power supply circuit to stop working, the following steps may be performed:

[0113] If a target type fault is detected, a first control signal in the form of a data frame is generated based on the target identification information; wherein the target identification information is used to instruct the second control device to control the second load to stop working;

[0114] Correspondingly, the target communication channel is also used to transmit the operating parameters of the first control device for controlling the first load. When the processor executes the step of sending the first control signal to the second control device through the target communication channel, it can be implemented by the following steps:

[0115] Based on a priority order of the first control signal and the second control signal, pausing transmission of the second control signal through the target communication channel; wherein the transmission priority of the first control signal is higher than the transmission priority of the second control signal;

[0116] The first control signal is sent to the second control device through the target communication channel with a preset duration as the communication interval for sending the first control signal.

[0117] In other embodiments of the present application, the preset duration is less than the duration during which the minimum operating voltage required by the first load is reduced to the minimum voltage allowed by the second capacitor connected in parallel with the first load when the first load is at a maximum.

[0118] In other embodiments of the present application, the target communication channel includes a wired communication channel or a wireless communication channel.

[0119] It should be noted that the specific implementation process of information interaction between units and modules in this embodiment can be referred to Figures 1-2 、 Figure 6 and Figures 8-9 The implementation process of the control method provided in the corresponding embodiment will not be repeated here.

[0120] In an embodiment of the present application, when the first control device detects a target type fault, it determines a first control signal for instructing the first load connected to the three-phase three-level power supply circuit to stop working, and sends the first control signal to the second control device through the target communication channel. In this way, the first control device sends the first control signal for instructing the first load to stop working to the second control device through the target communication channel, so that the second control device controls the first load to stop working, solving the current problem of not being able to quickly and timely control the half-bus load to stop working when a sudden fault occurs in the full bus load, realizing a control method for quickly and timely controlling the half-bus load to stop working, effectively reducing the probability of damage caused by overvoltage of the energy storage capacitor in the three-phase power supply circuit, improving the control efficiency of the three-phase four-wire power supply circuit, and reducing the failure rate of the power supply control circuit.

[0121] Based on the above embodiments, the embodiments of the present application provide a control system, referring to Figure 11 As shown, the control system 8 may include: a three-phase three-level power supply circuit 81, a first load 82, a second load 83, a first control device 84 and a second control device 85; wherein:

[0122] The three-phase three-level power supply circuit 81 is configured to rectify an input AC power signal to generate a DC power signal and provide operating power to a first load 82 connected to one busbar of the three-phase three-level power supply circuit, a second load 83 connected to two busbars of the three-phase three-level power supply circuit, a first control device 84, and a second control device 85.

[0123] The first control device 84 is used to monitor the three-phase three-level power supply circuit and the first load, so as to achieve the following Figures 1-2 、 Figure 6 and Figures 8-9 The implementation process of the method shown will not be described in detail here;

[0124] The second control device 85 is used to manage and control the second load.

[0125] The first control device 84 is the same device as the aforementioned first control device 7. The second control device 85 is usually used to manage and control the second load under the control of the first control device 84.

[0126] It should be noted that the circuit connection structure diagram between the various devices in the control system can refer to Figure 4 and Figure 5 The circuit connection diagram shown is not described in detail here.

[0127] Based on the above embodiments, the embodiments of the present application provide an air conditioning device, the air conditioning device comprising Figure 11 The air conditioner of the control system shown in FIG. 1 , wherein the first load is a DC fan load and the second load is a compressor load, will not be described in detail here.

[0128] For example, assuming that in a three-phase, three-level power supply circuit of an air-conditioning device, the second load, i.e., the compressor load, and the first load, i.e., the DC fan load, operate simultaneously, wherein the operating power of the compressor load is 3000 watts (W) and the operating power of the DC fan load is 100 W, since the power consumed by the DC fan load is much smaller than the power consumed by the compressor load, when the full bus voltage supplies power to the main load, i.e., the compressor load, and the lower half bus voltage supplies power to the small load, i.e., the DC fan, electrolytic capacitors C1 and C2 can both provide a voltage of 1650 W. The upper half bus capacitor, i.e., electrolytic capacitor C1, can supply 1650 W to the compressor load, while the lower half bus capacitor C2 supplies 100 W to the DC fan load while also supplying 1550 W to the main load, the compressor load. At this time, the power supply difference between electrolytic capacitors C1 and C2 is small, the midpoint potential between electrolytic capacitors C1 and C2 is balanced, and the voltages across electrolytic capacitors C1 and C2 are within their respective tolerance voltage ranges. However, when the compressor load fails and consumes no power, only the DC fan load consumes 100W of power in the entire working circuit. This causes the voltage across the large capacitor equivalent to electrolytic capacitors C1 and C2 to reach 650V due to the output of the three-level rectifier module. Electrolytic capacitors C1 and C2 are connected in series to divide the voltage. As a result, when the compressor load fails, only the DC fan load in the working circuit rapidly consumes energy, causing the charge of the lower bus capacitor C2 to be quickly consumed. However, the voltage across the large capacitor equivalent to electrolytic capacitors C1 and C2 remains unchanged, causing the voltage of the upper bus electrolytic capacitor C1 to rise rapidly, causing the voltage of electrolytic capacitor C1 to likely exceed its voltage tolerance value, further causing electrolytic capacitor C1 to explode and form a serious accident.

[0129] Thus, after the first control device determines that the second load has stopped operating, it notifies the second controller via the target communication channel that the second load has stopped operating and that the first load must be immediately controlled to stop operating. This results in both the upper and lower bus halves being unloaded, and electrolytic capacitors C1 and C2 evenly dividing the full bus voltage, thereby preventing electrolytic capacitor C1 from being damaged. Furthermore, due to the use of the target communication channel and its high communication speed, the master controller reacts promptly, thus protecting the capacitor from damage.

[0130] Based on the above embodiments, the embodiments of the present application provide a computer-readable storage medium, referred to as a storage medium, which stores one or more programs that can be executed by one or more processors to implement the following. Figures 1-2 、 Figure 6 and Figures 8-9 The implementation process of the control method provided by the corresponding embodiment will not be repeated here.

[0131] Those skilled in the art will appreciate that the embodiments of the present application may be provided as methods, systems, or computer program products. Therefore, the present application may adopt the form of hardware embodiments, software embodiments, or embodiments combining software and hardware. Furthermore, the present application may adopt the form of a computer program product implemented on one or more computer-usable storage media (including but not limited to magnetic disk storage and optical storage, etc.) containing computer-usable program code.

[0132] The present application is described with reference to the flowcharts and / or block diagrams of the methods, devices (systems), and computer program products according to the embodiments of the present application. It should be understood that each process and / or box in the flowchart and / or block diagram, as well as the combination of the processes and / or boxes in the flowchart and / or block diagram, can be implemented by computer program instructions. These computer program instructions can be provided to a processor of a general-purpose computer, a special-purpose computer, an embedded processor, or other programmable data processing device to produce a machine, so that the instructions executed by the processor of the computer or other programmable data processing device generate instructions for implementing the processes in the flowchart and / or block diagram. Figure 1 a process or multiple processes and / or boxes Figure 1 A device that provides the functions specified in a block or multiple blocks.

[0133] These computer program instructions may also be stored in a computer readable memory that can direct a computer or other programmable data processing device to work in a specific manner, so that the instructions stored in the computer readable memory produce an article of manufacture comprising an instruction device, which implements the process Figure 1 a process or multiple processes and / or boxes Figure 1 The function specified in one or more boxes.

[0134] These computer program instructions can also be loaded onto a computer or other programmable data processing device so that a series of operational steps are executed on the computer or other programmable device to produce a computer-implemented process, thereby providing the instructions executed on the computer or other programmable device for implementing the process. Figure 1 a process or multiple processes and / or boxes Figure 1 A step that specifies a function in one or more boxes.

[0135] The above description is merely a preferred embodiment of the present application and is not intended to limit the scope of protection of the present application.

Claims

1. A control method, characterized in that: The control method is applied to a first control device that manages a three-phase three-level power supply circuit, and the method includes: If a target type fault is detected, determining a first control signal for instructing a first load connected to the three-phase three-level power supply circuit to stop operating; wherein the first load is connected to one busbar of the three-phase three-level power supply circuit, and the target type fault is associated with a second load connected to two busbars of the three-phase three-level power supply circuit; The first control signal is sent to a second control device through a target communication channel; wherein the first control signal is used to instruct the second control device to control the first load to stop working.

2. The method according to claim 1, characterized in that The target type fault includes at least one of the following faults: a shutdown fault of the second load and an overvoltage fault of the first capacitor; wherein the first capacitor is an energy storage capacitor in the three-phase three-level power supply circuit except the second capacitor connected in parallel with the first load.

3. The method according to claim 1 or 2, characterized in that A transmission channel for transmitting a second control signal and the target communication channel are provided between the first control device and the second control device, the second control signal including an operating parameter of the first control device for controlling the first load, and sending the first control signal to the second control device through the target communication channel includes: If the first control signal is in the form of a data frame, the first control signal is sent to the second control device through the target communication channel at a preset time interval; wherein the preset time interval is less than a first duration, and the first duration is the time required for the minimum operating voltage of the first load to drop to the minimum voltage allowed by the second capacitor when the first load is maximum, and the second capacitor is a capacitor connected in parallel with the first load.

4. The method according to claim 1 or 2, characterized in that The first control device and the second control device include a transmission channel for transmitting a second control signal and the target communication channel, the second control signal includes the operating parameters of the first control device used to control the first load, and the first control signal also includes one of the following forms: high and low level signal form and voltage signal form.

5. The method according to claim 1, wherein If a target type fault is detected, determining a first control signal for instructing a first load connected to the three-phase three-level power supply circuit to stop operating includes: If the target type fault is detected, generating the first control signal in the form of a data frame based on the operating parameters of the first control device used to control the first load and the target identification information; wherein the target identification information is used to instruct the second control device to control the second load to stop working; Correspondingly, the target communication channel is further used to transmit an operating parameter of the first control device for controlling the first load, and sending the first control signal to the second control device through the target communication channel includes: The first control signal is sent to the second control device through the target communication channel with a preset duration as a communication interval for sending the first control signal.

6. The method according to claim 1, wherein If a target type fault is detected, determining a first control signal for instructing a first load connected to the three-phase three-level power supply circuit to stop operating includes: If the target type fault is detected, generating the first control signal in the form of a data frame based on the target identification information; wherein the target identification information is used to instruct the second control device to control the second load to stop working; Correspondingly, the target communication channel is further used to transmit an operating parameter of the first control device for controlling the first load, and sending the first control signal to the second control device through the target communication channel includes: Based on a priority order of the first control signal and the second control signal, pausing sending the second control signal through the target communication channel; wherein the sending priority of the first control signal is higher than the sending priority of the second control signal; The first control signal is sent to the second control device through the target communication channel with a preset duration as a communication interval for sending the first control signal.

7. The method according to claim 5 or 6, characterized in that The preset time length is less than the first time length, which is the time length required for the minimum operating voltage of the first load to drop to the minimum voltage allowed by the second capacitor when the first load is maximum. The second capacitor is a capacitor connected in parallel with the first load.

8. The method according to claim 1, characterized in that The target communication channel includes a wired communication channel or a wireless communication channel.

9. A first control device, characterized in that: The first control device includes: a processor and a target communication channel; wherein: The processor is configured to implement the following steps: if a target type fault is detected, determining a first control signal for instructing a first load connected to a three-phase three-level power supply circuit to stop operating; wherein the first load is connected to a busbar of the three-phase three-level power supply circuit, and the target type fault is associated with a second load connected to two busbars of the three-phase three-level power supply circuit; The target communication channel is used to communicate with the second control device and transmit the first control signal to the second control device; wherein the first control signal is used to instruct the second control device to control the second load to stop working.

10. A control system, characterized in that: The system includes: a three-phase three-level power supply circuit, a first load, a second load, a first control device and a second control device; wherein: The three-phase three-level power supply circuit is configured to rectify an input AC power signal to obtain a DC power signal, and provide operating power to the first load connected to one busbar of the three-phase three-level power supply circuit, the second load connected to two busbars of the three-phase three-level power supply circuit, the first control device, and the second control device; The first control device is configured to monitor the three-phase three-level power supply circuit and the first load to implement the steps of the control method according to any one of claims 1 to 8; The second control device is used to manage and control the second load.

11. An air conditioning device, characterized in that: The air conditioning equipment includes the control system according to claim 10; wherein the first load is a DC fan load, and the second load is a compressor load.

12. A storage medium, characterized in that: The storage medium stores a control program, which, when executed by a processor, implements the steps of the control method according to any one of claims 1 to 8.

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