Current source converter control method, device, circuit, equipment and medium

Abstract

The invention provides a control method, device, circuit and equipment of a current source type converter and a medium, and belongs to the technical field of converters. The method comprises the steps of determining a driving control signal based on a direct-current voltage, a direct-current voltage reference value and a preset double-loop control algorithm when the direct-current voltage is within a preset voltage range, and determining the driving control signal based on the direct-current voltage, the direct-current voltage reference value and a preset single-loop control algorithm when the direct-current voltage exceeds the preset voltage range; and controlling a plurality of controllable switching devices in the current source type converter based on the determined driving control signal. According to the invention, a single-loop control algorithm is used to replace a double-loop control algorithm, the control speed is improved, and the sudden change degree of the DC voltage is reduced, so that the probability that the DC voltage suddenly changes to obtain the voltage protection value of the load is reduced, and the stability and safety of load operation are improved.

Description

Technical Field

[0001] The present disclosure relates to the technical field of converters, and particularly to a control method, device, circuit, equipment and medium for a current source type converter. Background Art

[0002] Three-phase alternating current can be subjected to AC-DC conversion through a current source type converter to output a DC voltage to supply power to some loads.

[0003] Generally, a current source type converter determines a drive control signal based on a DC voltage reference value required by a load, an actually output DC voltage, and a double-loop control algorithm, and controls the conduction or shutdown of a plurality of controllable switch devices therein through the drive control signal, so that the output DC voltage can approach the DC voltage reference value, thereby effectively supplying power to the load.

[0004] However, in the actual working process, when the required power of the load suddenly changes, the DC voltage will suddenly increase or decrease. When the DC voltage decreases or increases to reach the voltage protection value of the load, it will affect the normal operation of the load or even cause the load to shut down. Summary of the Invention

[0005] Embodiments of the present disclosure provide a control method for a current source type converter, which can reduce the probability that the DC voltage suddenly changes to the voltage protection value of the load and improve the stability and safety of the load operation. The technical solution is as follows:

[0006] In a first aspect, a control method for a current source type converter is provided. The method includes:

[0007] Detect the DC voltage output by the DC source type converter;

[0008] When the DC voltage is within a preset voltage range, determine a drive control signal based on the DC voltage, the DC voltage reference value, and a preset double-loop control algorithm. When the DC voltage exceeds the preset voltage range, determine a drive control signal based on the DC voltage, the DC voltage reference value, and a preset single-loop control algorithm, where the upper limit of the preset voltage range is the sum of the DC voltage reference value and a first fluctuation value, and the lower limit of the preset voltage range is the difference between the DC voltage reference value and a second fluctuation value. The DC voltage reference value is the DC voltage expected to be input by the target load driven by the current source type converter;

[0009] Control a plurality of controllable switch devices in the current source type converter based on the determined drive control signal.

[0010] In a possible implementation, the preset dual-loop control algorithm is a voltage-current dual-loop control algorithm, and the preset single-loop control algorithm is a voltage single-loop control algorithm, a proportional control algorithm, a proportional-integral control algorithm, or a non-linear control algorithm.

[0011] In a possible implementation, when the DC voltage is within a preset voltage range, a drive control signal is determined based on the DC voltage, a DC voltage reference value, and the preset dual-loop control algorithm; when the DC voltage exceeds the preset voltage range, a drive control signal is determined based on the DC voltage, the DC voltage reference value, and the preset single-loop control algorithm, including:

[0012] When the DC voltage is within the preset voltage range, a voltage regulation value is determined based on the DC voltage, the DC voltage reference value, and the preset dual-loop control algorithm; when the DC voltage exceeds the preset voltage range, a voltage regulation value is determined based on the DC voltage, the DC voltage reference value, and the preset single-loop control algorithm;

[0013] A drive control signal is determined based on the determined voltage regulation value.

[0014] In a possible implementation, the method further includes:

[0015] When the DC voltage changes from being within the preset voltage range to exceeding the preset voltage range, the voltage regulation value finally output by the preset dual-loop control algorithm is used as the initial value of the voltage regulation value of the preset single-loop control algorithm.

[0016] In a possible implementation, the method further includes:

[0017] When the DC voltage changes from exceeding the preset voltage range to being within the preset voltage range, the voltage regulation value finally output by the preset single-loop control algorithm is used as the initial value of the voltage regulation value of the preset dual-loop control algorithm.

[0018] In a possible implementation, the method further includes:

[0019] When the DC voltage rises to be greater than a DC upper threshold, a plurality of controllable switch devices in the current source type converter are controlled to turn off, so as to disconnect the charging circuit of the DC bus capacitor in the current source type converter;

[0020] When the DC voltage drops to be less than a DC lower threshold, a drive control signal is determined based on the DC voltage, the DC voltage reference value, and the preset single-loop control algorithm, where the DC lower threshold is less than the DC upper threshold and greater than the upper limit of the preset voltage range.

[0021] In a possible implementation, the DC upper limit threshold is the sum of the DC voltage reference value and the third fluctuation value.

[0022] In a possible implementation, the DC lower limit threshold is the difference between the DC voltage reference value and the fourth fluctuation value.

[0023] In a second aspect, a control device for a current source type converter is provided. The device includes:

[0024] A detection module for detecting the DC voltage output by the DC source type converter;

[0025] A determination module for determining a drive control signal based on the DC voltage, the DC voltage reference value, and a preset double-loop control algorithm when the DC voltage is within a preset voltage range, and determining a drive control signal based on the DC voltage, the DC voltage reference value, and a preset single-loop control algorithm when the DC voltage exceeds the preset voltage range. Wherein, the upper limit of the preset voltage range is the sum of the DC voltage reference value and the first fluctuation value, the lower limit of the preset voltage range is the difference between the DC voltage reference value and the second fluctuation value, and the DC voltage reference value is the DC voltage expected to be input by the target load driven by the current source type converter;

[0026] A control module for controlling a plurality of controllable switching devices in the current source type converter based on the determined drive control signal.

[0027] In a possible implementation, the preset double-loop control algorithm is a voltage-current double-loop control algorithm, and the preset single-loop control algorithm is a voltage single-loop control algorithm, a proportional control algorithm, a proportional-integral control algorithm, or a non-linear control algorithm.

[0028] In a possible implementation, the determination module is configured to:

[0029] When the DC voltage is within the preset voltage range, determine a voltage adjustment value based on the DC voltage, the DC voltage reference value, and the preset double-loop control algorithm, and when the DC voltage exceeds the preset voltage range, determine a voltage adjustment value based on the DC voltage, the DC voltage reference value, and the preset single-loop control algorithm;

[0030] Determine a drive control signal based on the determined voltage adjustment value.

[0031] In a possible implementation, the determination module is further configured to:

[0032] When the DC voltage changes from within the preset voltage range to outside the preset voltage range, the voltage regulation value finally output by the preset double-loop control algorithm is used as the initial value of the voltage regulation value of the preset single-loop control algorithm.

[0033] In a possible implementation, the determining module is further configured to:

[0034] When the DC voltage changes from outside the preset voltage range to within the preset voltage range, the voltage regulation value finally output by the preset single-loop control algorithm is used as the initial value of the voltage regulation value of the preset double-loop control algorithm.

[0035] In a possible implementation, the determining module is further configured to:

[0036] When the DC voltage rises to be greater than the DC upper limit threshold, control multiple controllable switch devices in the current source type converter to turn off, so as to disconnect the charging circuit of the DC bus capacitor in the current source type converter;

[0037] When the DC voltage drops to be less than the DC lower limit threshold, based on the DC voltage, the DC voltage reference value and the preset single-loop control algorithm, determine the drive control signal, where the DC lower limit threshold is less than the DC upper limit threshold and greater than the upper limit of the preset voltage range.

[0038] In a possible implementation, the DC upper limit threshold is the sum of the DC voltage reference value and the third fluctuation value.

[0039] In a possible implementation, the DC lower limit threshold is the difference between the DC voltage reference value and the fourth fluctuation value.

[0040] In a third aspect, a control circuit for a current source type converter is provided, and the control circuit includes a current source type converter and a controller;

[0041] The controller is configured to:

[0042] Detect the DC voltage output by the DC source type converter;

[0043] When the DC voltage is within the preset voltage range, a drive control signal is determined based on the DC voltage, the DC voltage reference value, and a preset double-loop control algorithm; when the DC voltage exceeds the preset voltage range, a drive control signal is determined based on the DC voltage, the DC voltage reference value, and a preset single-loop control algorithm, where the upper limit of the preset voltage range is the sum of the DC voltage reference value and a first fluctuation value, the lower limit of the preset voltage range is the difference between the DC voltage reference value and a second fluctuation value, and the DC voltage reference value is the DC voltage that the target load driven by the current source type converter expects to input;

[0044] Based on the determined drive control signal, multiple controllable switch devices in the current source type converter are controlled.

[0045] In a possible implementation manner, the preset double-loop control algorithm is a voltage-current double-loop control algorithm, and the preset single-loop control algorithm is a voltage single-loop control algorithm, a proportional control algorithm, a proportional-integral control algorithm, or a non-linear control algorithm.

[0046] In a possible implementation manner, the controller is configured to:

[0047] When the DC voltage is within the preset voltage range, a voltage regulation value is determined based on the DC voltage, the DC voltage reference value, and the preset double-loop control algorithm; when the DC voltage exceeds the preset voltage range, a voltage regulation value is determined based on the DC voltage, the DC voltage reference value, and the preset single-loop control algorithm;

[0048] Based on the determined voltage regulation value, a drive control signal is determined.

[0049] In a possible implementation manner, the controller is further configured to:

[0050] When the DC voltage changes from being within the preset voltage range to exceeding the preset voltage range, the voltage regulation value finally output by the preset double-loop control algorithm is used as the initial value of the voltage regulation value of the preset single-loop control algorithm.

[0051] In a possible implementation manner, the controller is further configured to:

[0052] When the DC voltage changes from exceeding the preset voltage range to being within the preset voltage range, the voltage regulation value finally output by the preset single-loop control algorithm is used as the initial value of the voltage regulation value of the preset double-loop control algorithm.

[0053] In a possible implementation manner, the controller is further configured to:

[0054] When the DC voltage rises to be greater than the DC upper threshold, control multiple controllable switching devices in the current source type converter to turn off, so as to disconnect the charging circuit of the DC bus capacitor in the current source type converter;

[0055] When the DC voltage drops to be less than the DC lower threshold, based on the DC voltage, the DC voltage reference value, and a preset single-loop control algorithm, determine the drive control signal, where the DC lower threshold is less than the DC upper threshold and greater than the upper limit of the preset voltage range.

[0056] In a possible implementation, the DC upper threshold is the sum of the DC voltage reference value and a third fluctuation value.

[0057] In a possible implementation, the DC lower threshold is the difference between the DC voltage reference value and a fourth fluctuation value.

[0058] In a fourth aspect, a computer device is provided, the computer device includes a processor and a memory, and at least one instruction is stored in the memory, and the instruction is loaded and executed by the processor to implement the operations performed by the control method of the current source type converter.

[0059] In a fifth aspect, a computer-readable storage medium is provided, and at least one instruction is stored in the storage medium, and the instruction is loaded and executed by the processor to implement the operations performed by the control method of the current source type converter.

[0060] In a sixth aspect, a computer program product is provided, and at least one instruction is included in the computer program product, and the at least one instruction is loaded and executed by the processor to implement the operations performed by the control method of the current source type converter.

[0061] The beneficial effects brought by the technical solutions provided in the embodiments of the present disclosure are as follows: In the solutions mentioned in the embodiments of the present disclosure, when the DC voltage exceeds the preset voltage range, the preset single-loop control algorithm is used to replace the preset double-loop control algorithm. Since the response speed of the single-loop control algorithm is usually greater than that of the double-loop control algorithm, therefore, using the preset single-loop control algorithm improves the control speed for sudden increases or decreases in the DC voltage, reduces the degree of mutation of the DC voltage, thereby reducing the probability that the DC voltage mutates to the voltage protection value of the load, and improving the stability and safety of the load operation. BRIEF DESCRIPTION OF THE DRAWINGS

[0062] In order to more clearly illustrate the technical solutions in the embodiments of the present disclosure, the following will briefly introduce the drawings required for the description of the embodiments. Obviously, the following drawings are only some embodiments of the present disclosure. For those of ordinary skill in the art, without creative efforts, other drawings can also be obtained based on these drawings.

[0063] Figure 1 It is a topological schematic diagram of a current source type converter provided by an embodiment of the present disclosure;

[0064] Figure 2 It is a flowchart of a control method for a current source type converter provided by an embodiment of the present disclosure;

[0065] Figure 3 It is a flowchart of a method for determining a drive control signal provided by an embodiment of the present disclosure;

[0066] Figure 4 It is a flowchart of a method for determining a drive control signal provided by an embodiment of the present disclosure;

[0067] Figure 5 It is a structural schematic diagram of a control device for a current source type converter provided by an embodiment of the present disclosure;

[0068] Figure 6 It is a structural block diagram of a terminal provided by an embodiment of the present disclosure;

[0069] Figure 7 It is a structural block diagram of a server provided by an embodiment of the present disclosure. Detailed implementation manners

[0070] To make the purpose, technical solutions and advantages of the present disclosure clearer, the embodiments of the present disclosure will be further described in detail below in conjunction with the accompanying drawings.

[0071] An embodiment of the present disclosure provides a control method for a current source type converter, and this method can be implemented by a computer device. The computer device can be a terminal, a server, etc. The terminal can be a desktop computer, a notebook computer, a tablet computer, a mobile phone, etc.

[0072] The computer device can include a processor, a memory, a communication component, etc.

[0073] The processor can be a central processing unit (CPU). The processor can be used to read instructions and process data. For example, it can detect the DC voltage output by the DC source type converter, determine the drive control signal, and control a plurality of controllable switch devices in the current source type converter based on the drive control signal, and so on.

[0074] The memory can be various volatile memories or non-volatile memories, such as solid state disk (SSD), dynamic random access memory (DRAM), etc. The memory can be used for data storage. For example, storing the data of the DC voltage output by the detected current source type converter, storing the corresponding data of the preset double-loop control algorithm, storing the corresponding data of the preset single-loop control algorithm, storing the data of the determined drive control signal, and so on.

[0075] The communication component can be a wired network connector, a wireless fidelity (WiFi) module, a Bluetooth module, a cellular network communication module, etc. The communication component can be used for data transmission with other devices.

[0076] See Figure 1 , Figure 1 is a topological schematic diagram of a current source type converter, where, v gabc is the three-phase AC voltage of the input current source type converter, V dc is the DC voltage output by the current source type converter, i dc is the output current of the current source type converter, C dc is the DC bus capacitor in the current source type converter. The current source type converter can convert three-phase alternating current into direct current, thus forming a DC bus.

[0077] Figure 2 is a flowchart of a control method for a current source type converter provided by an embodiment of the present disclosure. See Figure 2 , this embodiment includes:

[0078] 201. Detect the DC voltage output by the DC source type converter.

[0079] In implementation, the DC voltage output by the current source type converter can be detected periodically, so as to obtain real-time and accurate DC voltage values.

[0080] 202. When the DC voltage is within the preset voltage range, determine the drive control signal based on the DC voltage, the DC voltage reference value, and the preset double-loop control algorithm. When the DC voltage exceeds the preset voltage range, determine the drive control signal based on the DC voltage, the DC voltage reference value, and the preset single-loop control algorithm.

[0081] Among them, the upper limit of the preset voltage range is the sum of the DC voltage reference value and the first fluctuation value, and the lower limit of the preset voltage range is the difference between the DC voltage reference value and the second fluctuation value. Both the first fluctuation value and the second fluctuation value are positive values. For example, both the first fluctuation value and the second fluctuation value are 0.5 volts, or the first fluctuation value is 0.5 volts and the second fluctuation value is 0.3 volts, etc. The embodiments of the present disclosure do not limit their specific values.

[0082] The DC voltage reference value is the DC voltage that the target load driven by the current source type converter expects to input. The DC voltage reference value can be preset through experimental results or calibrated when the target load leaves the factory. The embodiments of the present disclosure do not limit its specific acquisition method.

[0083] In implementation, refer to Figure 3 , when the DC voltage is within the preset voltage range, it indicates that the load and the current source type converter are working stably. At this time, the DC voltage and the DC voltage reference value can be input into the preset double-loop control algorithm to obtain the output drive control signal, and based on this drive control signal, multiple controllable switch devices in the current source type converter are controlled to work.

[0084] Refer to Figure 4 , when the DC voltage exceeds the preset voltage range, that is, when the DC voltage is greater than the upper limit of the preset voltage range or less than the lower limit of the preset voltage range, it indicates that the demand power of the load has mutated at this time, resulting in a sudden increase or decrease in the DC voltage. Therefore, the preset double-loop control algorithm can be switched to the preset single-loop control algorithm, and the DC voltage and the DC voltage reference value are input into the preset single-loop control algorithm to obtain the output drive control signal, and then based on this drive control signal, multiple controllable switch devices in the current source type converter are controlled to work.

[0085] Since the response speed of the single-loop control algorithm is usually greater than that of the double-loop control algorithm, in the embodiments of the present disclosure, switching the preset double-loop control algorithm to the preset single-loop control algorithm improves the speed of controlling the sudden increase or decrease of the DC voltage, that is, the degree of sudden increase or decrease of the DC voltage within a certain period of time is reduced, thereby reducing the probability of the DC voltage mutating to reach the voltage protection value of the load, and further improving the stability and safety of the load operation.

[0086] In a possible implementation manner, the preset double-loop control algorithm can be a voltage-current double-loop control algorithm, and the preset single-loop control algorithm can be a voltage single-loop control algorithm, a proportional control algorithm, a proportional-integral control algorithm, or a non-linear control algorithm. Or, the preset double-loop control algorithm and the preset single-loop control algorithm can also be other reasonable control algorithms. The embodiments of the present disclosure do not make specific limitations in this regard.

[0087] In a possible implementation, the method for determining the drive control signal in this step 202 may be as follows: when the DC voltage is within the preset voltage range, based on the DC voltage, the DC voltage reference value, and the preset double-loop control algorithm, determine the voltage regulation value; when the DC voltage exceeds the preset voltage range, based on the DC voltage, the DC voltage reference value, and the preset single-loop control algorithm, determine the voltage regulation value; based on the determined voltage regulation value, determine the drive control signal.

[0088] In implementation, refer to Figure 3 , when the detected DC voltage is within the preset voltage range, input the DC voltage and the DC voltage reference value into the preset double-loop control algorithm to obtain the output voltage regulation value.

[0089] Refer to Figure 4 , when the DC voltage exceeds the preset voltage range, that is, when the DC voltage is greater than the upper limit of the preset voltage range or less than the lower limit of the preset voltage range, input the DC voltage and the DC voltage reference value into the preset single-loop control algorithm to obtain the output voltage regulation value.

[0090] After obtaining the voltage regulation value through any one of the above two methods, the voltage regulation value can be input into the modulation algorithm to obtain the output drive control signal.

[0091] In a possible implementation, when the DC voltage changes from within the preset voltage range to exceeding the preset voltage range, use the voltage regulation value finally output by the preset double-loop control algorithm as the initial value of the voltage regulation value of the preset single-loop control algorithm.

[0092] In implementation, when the DC voltage changes from within the preset voltage range to exceeding the preset voltage range, the control algorithm switches from the preset double-loop control algorithm to the preset single-loop control algorithm. When the preset single-loop control algorithm needs to perform integral processing on the voltage regulation value output each time, if the initial value of the voltage regulation value is not set, it defaults to zero. If the initial value of the voltage regulation value is zero, then when the preset double-loop control algorithm switches to the preset single-loop control algorithm, the adjustment speed of the preset single-loop control algorithm will be relatively slow. Therefore, in the embodiments of the present disclosure, to avoid the above situation, the voltage regulation value finally output by the preset double-loop control algorithm will be used as the initial value of the voltage regulation value of the preset single-loop control algorithm (which can also be called pre-synchronization processing), thereby improving the rate of the preset single-loop control algorithm.

[0093] Similarly, when the DC voltage changes from exceeding the preset voltage range to within the preset voltage range, use the voltage regulation value finally output by the preset single-loop control algorithm as the initial value of the voltage regulation value of the preset double-loop control algorithm.

[0094] In this way, when the preset double-loop control algorithm needs to perform integral processing on the voltage adjustment value output each time, the voltage adjustment value finally output by the preset single-loop control algorithm can be pre-synchronized to the initial value of the voltage adjustment value of the preset double-loop control algorithm to improve the rate of the preset double-loop control algorithm.

[0095] 203. Based on the determined drive control signal, control a plurality of controllable switch devices in the current source type converter.

[0096] In implementation, after obtaining the drive control signal, based on the drive control signal, a plurality of controllable switch devices in the current source type converter can be controlled to turn on or off the controllable switch devices, so that the DC voltage output by the current source type converter approaches the DC voltage reference value to meet the power supply requirements of the target load.

[0097] In a possible implementation manner, the controllable switch device can be any one of IGBT, Mosfet, and the combination of IGBT and diode in reverse parallel, or it can also be other reasonable switch devices, and the embodiments of the present disclosure do not make specific limitations thereto.

[0098] In the related art, there is also the following situation in the control method of the current source type converter: when the target load is a light load, it may cause the transfer power on the DC side to be greater than the power required by the load, and then cause the energy in the DC bus capacitor to continuously accumulate and the DC voltage to continuously rise, triggering DC overvoltage protection or threatening the safety of the load.

[0099] For the above situation, the control method of the current source type converter provided by the embodiments of the present disclosure may further include the following:

[0100] When the DC voltage rises to be greater than the DC upper threshold, control the plurality of controllable switch devices in the current source type converter to turn off to disconnect the charging circuit of the DC bus capacitor in the current source type converter; when the DC voltage drops to be less than the DC lower threshold, determine the drive control signal based on the DC voltage, the DC voltage reference value, and the preset single-loop control algorithm.

[0101] Wherein, the DC upper threshold is a preset upper limit value of the DC voltage to avoid the occurrence of DC overvoltage protection or events threatening the safety of the target load when the DC voltage exceeds the DC upper threshold.

[0102] The DC lower threshold is less than the DC upper threshold and greater than the upper limit of the preset voltage range.

[0103] In implementation, the latest detected DC voltage is compared with a pre-stored DC upper limit threshold. When the DC voltage rises to be greater than the DC upper limit threshold, it indicates that there is likely a problem of excessive DC voltage under light load at this time. At this time, multiple controllable switch devices in the current source type converter can be controlled to disconnect, so as to disconnect the charging circuit of the DC bus capacitor in the current source type converter, enabling the DC bus capacitor to continuously discharge to supply power to the target load, thereby enabling the DC voltage to gradually decrease to avoid overvoltage protection or events that affect the normal operation of the target load.

[0104] After multiple controllable switch devices are disconnected, when the DC voltage drops to reach the DC lower limit threshold, it indicates that the DC voltage has returned to normal or has recovered to a large extent at this time. Therefore, the DC voltage and the DC voltage reference value can be input into a preset single-loop control algorithm to obtain an output drive control signal, and then based on the drive control signal, multiple controllable switch devices in the current source type converter are controlled to operate so that the DC voltage can normally supply power to the target load. Then, the processing of step 202 above can be performed. If the subsequent DC voltage changes from being greater than the upper limit of the preset voltage range to being within the preset voltage range, the preset single-loop control algorithm can be switched to a preset double-loop control algorithm.

[0105] In this way, by controlling multiple controllable switch devices to disconnect and stop charging the DC bus capacitor, during this process, the DC bus capacitor has been charging the target load all the time, thereby reducing the DC voltage, and further reducing the possibility of DC overvoltage protection events and events threatening the safety of the load, improving the stability and safety of the operation of the target load.

[0106] Moreover, by setting the DC lower limit threshold to be greater than the upper limit of the preset voltage range, the preset single-loop control algorithm can be used when the DC voltage changes greatly, and the preset double-loop control algorithm can be used when the DC voltage returns to the preset voltage range, improving the control speed for the sudden change of the DC voltage, reducing the degree of sudden change of the DC voltage, and thus improving the stability and safety of the operation of the target load.

[0107] In a possible implementation manner, the DC upper limit threshold can be the sum of the DC voltage reference value and a third fluctuation value.

[0108] Among them, the third fluctuation value is a positive value, and this third fluctuation value can be set according to experimental results or according to experience to ensure that the value of the DC upper limit threshold can avoid overvoltage protection events and events that affect the normal operation of the target load. For example, the third fluctuation value can be set to 5 volts, 3 volts, etc. The specific value thereof is not limited in the embodiments of the present disclosure.

[0109] In a possible implementation manner, the DC lower limit threshold is the difference between the DC voltage reference value and a fourth fluctuation value.

[0110] Among them, the fourth fluctuation value is a positive value, and the fourth fluctuation value can be set according to experimental results or according to experience. For example, the fourth fluctuation value can be set to 3 volts, 1 volt, etc. The embodiments of the present disclosure do not limit its specific value.

[0111] All the above optional technical solutions can be combined arbitrarily to form optional embodiments of the present disclosure, which will not be elaborated here one by one.

[0112] In the embodiments of the present disclosure, when the DC voltage exceeds the preset voltage range, the preset single-loop control algorithm is used to replace the preset double-loop control algorithm. Since the response speed of the single-loop control algorithm is usually greater than that of the double-loop control algorithm, using the preset single-loop control algorithm improves the control speed of the sudden increase or sudden decrease of the DC voltage, reduces the mutation degree of the DC voltage, thereby reducing the probability that the DC voltage mutates to the voltage protection value of the load, and improving the stability and safety of the load operation.

[0113] The embodiments of the present disclosure provide a control device for a current source type converter, and the device can be the computer device in the above embodiments, such as Figure 5 As shown, the device includes:

[0114] A detection module 510, configured to detect the DC voltage output by the DC source type converter;

[0115] A determination module 520, configured to determine a drive control signal based on the DC voltage, a DC voltage reference value, and a preset double-loop control algorithm when the DC voltage is within the preset voltage range, and determine a drive control signal based on the DC voltage, the DC voltage reference value, and a preset single-loop control algorithm when the DC voltage exceeds the preset voltage range, where the upper limit of the preset voltage range is the sum of the DC voltage reference value and the first fluctuation value, the lower limit of the preset voltage range is the difference between the DC voltage reference value and the second fluctuation value, and the DC voltage reference value is the DC voltage that the target load driven by the current source type converter expects to input;

[0116] A control module 530, configured to control a plurality of controllable switch devices in the current source type converter based on the determined drive control signal.

[0117] In a possible implementation manner, the preset double-loop control algorithm is a voltage-current double-loop control algorithm, and the preset single-loop control algorithm is a voltage single-loop control algorithm, a proportional control algorithm, a proportional-integral control algorithm, or a non-linear control algorithm.

[0118] In a possible implementation manner, the determination module 520 is configured to:

[0119] When the DC voltage is within the preset voltage range, determine a voltage regulation value based on the DC voltage, the DC voltage reference value, and a preset double-loop control algorithm; when the DC voltage exceeds the preset voltage range, determine a voltage regulation value based on the DC voltage, the DC voltage reference value, and a preset single-loop control algorithm.

[0120] Determine a drive control signal based on the determined voltage regulation value.

[0121] In a possible implementation manner, the determining module 520 is further configured to:

[0122] When the DC voltage changes from being within the preset voltage range to exceeding the preset voltage range, use the voltage regulation value finally output by the preset double-loop control algorithm as the initial value of the voltage regulation value of the preset single-loop control algorithm.

[0123] In a possible implementation manner, the determining module 520 is further configured to:

[0124] When the DC voltage changes from exceeding the preset voltage range to being within the preset voltage range, use the voltage regulation value finally output by the preset single-loop control algorithm as the initial value of the voltage regulation value of the preset double-loop control algorithm.

[0125] In a possible implementation manner, the determining module 520 is further configured to:

[0126] When the DC voltage rises to be greater than the DC upper threshold, control multiple controllable switch devices in the current source type converter to turn off, so as to disconnect the charging circuit of the DC bus capacitor in the current source type converter, enabling the DC bus capacitor to continuously discharge.

[0127] When the DC voltage drops to be less than the DC lower threshold, determine the drive control signal based on the DC voltage, the DC voltage reference value, and a preset single-loop control algorithm, where the DC lower threshold is less than the DC upper threshold and greater than the upper limit of the preset voltage range.

[0128] In a possible implementation manner, the DC upper threshold is the sum of the DC voltage reference value and a third fluctuation value.

[0129] In a possible implementation manner, the DC lower threshold is the difference between the DC voltage reference value and a fourth fluctuation value.

[0130] It should be noted that when the control device of the current source type converter provided in the above embodiments controls the current source type converter, only the division of the above functional modules is used for illustration. In actual applications, the above functions can be allocated to different functional modules according to needs, that is, the internal structure of the device is divided into different functional modules to complete all or part of the functions described above. In addition, the control device of the current source type converter provided in the above embodiments and the embodiments of the control method of the current source type converter belong to the same concept. For the specific implementation process, please refer to the method embodiments and will not be elaborated here.

[0131] An embodiment of the present disclosure provides a control circuit for a current source type converter. The control circuit includes a current source type converter and a controller.

[0132] The controller is configured to:

[0133] Detect the DC voltage output by the DC source type converter;

[0134] When the DC voltage is within a preset voltage range, determine a drive control signal based on the DC voltage, a DC voltage reference value, and a preset double-loop control algorithm. When the DC voltage exceeds the preset voltage range, determine a drive control signal based on the DC voltage, the DC voltage reference value, and a preset single-loop control algorithm. Wherein, the upper limit of the preset voltage range is the sum of the DC voltage reference value and a first fluctuation value, and the lower limit of the preset voltage range is the difference between the DC voltage reference value and a second fluctuation value. The DC voltage reference value is the DC voltage that the target load driven by the current source type converter expects to input.

[0135] Control a plurality of controllable switch devices in the current source type converter based on the determined drive control signal.

[0136] In a possible implementation manner, the preset double-loop control algorithm is a voltage-current double-loop control algorithm, and the preset single-loop control algorithm is a voltage single-loop control algorithm, a proportional control algorithm, a proportional-integral control algorithm, or a non-linear control algorithm.

[0137] In a possible implementation manner, the controller is configured to:

[0138] When the DC voltage is within a preset voltage range, determine a voltage adjustment value based on the DC voltage, the DC voltage reference value, and a preset double-loop control algorithm. When the DC voltage exceeds the preset voltage range, determine a voltage adjustment value based on the DC voltage, the DC voltage reference value, and a preset single-loop control algorithm.

[0139] Determine a drive control signal based on the determined voltage adjustment value.

[0140] In a possible implementation, the controller is further configured to:

[0141] When the DC voltage changes from within the preset voltage range to outside the preset voltage range, use the voltage regulation value finally output by the preset double-loop control algorithm as the initial value of the voltage regulation value of the preset single-loop control algorithm.

[0142] In a possible implementation, the controller is further configured to:

[0143] When the DC voltage changes from outside the preset voltage range to within the preset voltage range, use the voltage regulation value finally output by the preset single-loop control algorithm as the initial value of the voltage regulation value of the preset double-loop control algorithm.

[0144] In a possible implementation, the controller is further configured to:

[0145] When the DC voltage rises to be greater than the DC upper threshold, control multiple controllable switch devices in the current source type converter to turn off, so as to disconnect the charging circuit of the DC bus capacitor in the current source type converter, enabling the DC bus capacitor to continuously discharge;

[0146] When the DC voltage drops to be less than the DC lower threshold, determine the drive control signal based on the DC voltage, the DC voltage reference value, and a preset single-loop control algorithm, where the DC lower threshold is less than the DC upper threshold and greater than the upper limit of the preset voltage range.

[0147] In a possible implementation, the DC upper threshold is the sum of the DC voltage reference value and a third fluctuation value.

[0148] In a possible implementation, the DC lower threshold is the difference between the DC voltage reference value and a fourth fluctuation value.

[0149] Figure 6 FIG. shows a structural block diagram of a terminal 600 provided by an exemplary embodiment of the present disclosure. The terminal may be the computer device in the above embodiment. The terminal 600 may be: a smart phone, a tablet computer, an MP3 player (Moving Picture Experts Group Audio Layer III), an MP4 (Moving Picture Experts Group Audio Layer IV) player, a laptop computer, or a desktop computer. The terminal 600 may also be referred to by other names such as a user equipment, a portable terminal, a laptop terminal, a desktop terminal, etc.

[0150] Generally, the terminal 600 includes a processor 601 and a memory 602.

[0151] The processor 601 may include one or more processing cores, such as a quad-core processor, an octa-core processor, etc. The processor 601 may be implemented in at least one hardware form of DSP (digital signal processing), FPGA (field-programmable gate array), or PLA (programmable logic array). The processor 601 may also include a main processor and a coprocessor. The main processor is a processor for processing data in the wake state, also known as the CPU (central processing unit); the coprocessor is a low-power processor for processing data in the standby state. In some embodiments, the processor 601 may be integrated with a GPU (graphics processing unit), and the GPU is responsible for rendering and drawing the content to be displayed on the display screen. In some embodiments, the processor 601 may further include an AI (artificial intelligence) processor, and the AI processor is used to process computational operations related to machine learning.

[0152] The memory 602 may include one or more computer-readable storage media, and the computer-readable storage media may be non-transitory. The memory 602 may further include high-speed random access memory and non-volatile memory, such as one or more disk storage devices and flash storage devices. In some embodiments, the non-transitory computer-readable storage media in the memory 602 is used to store at least one instruction, and the at least one instruction is used to be executed by the processor 601 to implement the control method of the current-source type converter provided in the method embodiments of the present disclosure.

[0153] In some embodiments, the terminal 600 may further optionally include a peripheral device interface 603 and at least one peripheral device. The processor 601, the memory 602, and the peripheral device interface 603 may be connected through a bus or signal lines. Each peripheral device may be connected to the peripheral device interface 603 through a bus, signal lines, or a circuit board. Specifically, the peripheral device includes at least one of a radio frequency circuit 604, a display screen 605, a camera 606, an audio circuit 607, a positioning component 608, and a power supply 609.

[0154] The peripheral device interface 603 can be used to connect at least one I / O (input / output) related peripheral device to the processor 601 and the memory 602. In some embodiments, the processor 601, the memory 602, and the peripheral device interface 603 are integrated on the same chip or circuit board; in some other embodiments, any one or two of the processor 601, the memory 602, and the peripheral device interface 603 can be implemented on a separate chip or circuit board, and this embodiment does not limit this.

[0155] The radio frequency circuit 604 is used to receive and transmit RF (radio frequency) signals, also known as electromagnetic signals. The radio frequency circuit 604 communicates with the communication network and other communication devices through electromagnetic signals. The radio frequency circuit 604 converts an electrical signal into an electromagnetic signal for transmission, or converts the received electromagnetic signal into an electrical signal. Optionally, the radio frequency circuit 604 includes: an antenna system, an RF transceiver, one or more amplifiers, a tuner, an oscillator, a digital signal processor, a codec chipset, a subscriber identity module card, and so on. The radio frequency circuit 604 can communicate with other terminals through at least one wireless communication protocol. The wireless communication protocol includes but is not limited to: metropolitan area network, generations of mobile communication networks (2G, 3G, 4G, and 5G), wireless local area network, and / or WiFi (wireless fidelity) network. In some embodiments, the radio frequency circuit 604 may further include a circuit related to NFC (near field communication), and the present disclosure does not limit this.

[0156] The display screen 605 is used to display the UI (user interface). The UI may include graphics, text, icons, videos, and any combination thereof. When the display screen 605 is a touch display screen, the display screen 605 also has the ability to collect touch signals on or above the surface of the display screen 605. The touch signals can be input as control signals to the processor 601 for processing. At this time, the display screen 605 can also be used to provide virtual buttons and / or a virtual keyboard, also known as soft buttons and / or a soft keyboard. In some embodiments, there may be one display screen 605, which is provided on the front panel of the terminal 600; in other embodiments, there may be at least two display screens 605, which are respectively provided on different surfaces of the terminal 600 or are in a folding design; in still other embodiments, the display screen 605 may be a flexible display screen, which is provided on the curved surface or the folding surface of the terminal 600. Even further, the display screen 605 can also be set to an irregular non-rectangular shape, that is, an irregular-shaped screen. The display screen 605 can be prepared using materials such as LCD (liquid crystal display) and OLED (organic light-emitting diode).

[0157] The camera module 606 is used to capture images or videos. Optionally, the camera module 606 includes a front camera and a rear camera. Generally, the front camera is provided on the front panel of the terminal, and the rear camera is provided on the back of the terminal. In some embodiments, there are at least two rear cameras, which are any one of a main camera, a depth-of-field camera, a wide-angle camera, and a telephoto camera, to achieve functions such as background blurring by fusing the main camera and the depth-of-field camera, panoramic shooting by fusing the main camera and the wide-angle camera, and VR (virtual reality) shooting functions or other fused shooting functions. In some embodiments, the camera module 606 may also include a flash. The flash can be a single-color-temperature flash or a two-color-temperature flash. A two-color-temperature flash refers to a combination of a warm light flash and a cold light flash, which can be used for light compensation under different color temperatures.

[0158] The audio circuit 607 may include a microphone and a speaker. The microphone is used to collect sound waves of the user and the environment, and convert the sound waves into electrical signals for input to the processor 601 for processing, or input to the radio frequency circuit 604 to implement voice communication. For the purpose of stereo collection or noise reduction, there may be multiple microphones, which are respectively arranged at different parts of the terminal 600. The microphone may also be an array microphone or an omnidirectional collection microphone. The speaker is used to convert the electrical signal from the processor 601 or the radio frequency circuit 604 into sound waves. The speaker may be a traditional thin film speaker or a piezoelectric ceramic speaker. When the speaker is a piezoelectric ceramic speaker, it can not only convert the electrical signal into sound waves audible to humans, but also convert the electrical signal into sound waves inaudible to humans for uses such as ranging. In some embodiments, the audio circuit 607 may further include a headphone jack.

[0159] The positioning component 608 is used to locate the current geographical location of the terminal 600 to implement navigation or LBS (location based service). The positioning component 608 may be a positioning component based on GPS (global positioning system), Beidou system, GLONASS system or Galileo system.

[0160] The power supply 609 is used to supply power to each component in the terminal 600. The power supply 609 may be alternating current, direct current, a disposable battery or a rechargeable battery. When the power supply 609 includes a rechargeable battery, the rechargeable battery may support wired charging or wireless charging. The rechargeable battery may also be used to support fast charging technology.

[0161] In some embodiments, the terminal 600 further includes one or more sensors 610. The one or more sensors 610 include but are not limited to: an acceleration sensor 611, a gyroscope sensor 612, a pressure sensor 613, a fingerprint sensor 614, an optical sensor 615 and a proximity sensor 616.

[0162] The acceleration sensor 611 can detect the magnitude of acceleration on the three coordinate axes of the coordinate system established with the terminal 600. For example, the acceleration sensor 611 can be used to detect the components of the gravitational acceleration on the three coordinate axes. The processor 601 can control the display screen 605 to display the user interface in a landscape view or a portrait view according to the gravitational acceleration signal collected by the acceleration sensor 611. The acceleration sensor 611 can also be used for collecting game or user's motion data.

[0163] The gyroscope sensor 612 can detect the body direction and rotation angle of the terminal 600. The gyroscope sensor 612 can cooperate with the acceleration sensor 611 to collect the 3D actions of the user on the terminal 600. Based on the data collected by the gyroscope sensor 612, the processor 601 can implement the following functions: motion sensing (such as changing the UI according to the user's tilt operation), image stabilization during shooting, game control, and inertial navigation.

[0164] The pressure sensor 613 can be disposed on the side frame of the terminal 600 and / or the lower layer of the display screen 605. When the pressure sensor 613 is disposed on the side frame of the terminal 600, it can detect the holding signal of the user on the terminal 600, and the processor 601 can perform left / right hand recognition or shortcut operations according to the holding signal collected by the pressure sensor 613. When the pressure sensor 613 is disposed on the lower layer of the display screen 605, the processor 601 can control the operable controls on the UI interface according to the pressure operation of the user on the display screen 605. The operable controls include at least one of button controls, scroll bar controls, icon controls, and menu controls.

[0165] The fingerprint sensor 614 is used to collect the fingerprints of the user. The processor 601 can identify the user's identity according to the fingerprints collected by the fingerprint sensor 614, or the fingerprint sensor 614 can identify the user's identity according to the collected fingerprints. When the identity of the user is identified as a trusted identity, the processor 601 authorizes the user to perform relevant sensitive operations, and the sensitive operations include unlocking the screen, viewing encrypted information, downloading software, making payments, and changing settings, etc. The fingerprint sensor 614 can be disposed on the front, back, or side of the terminal 600. When there are physical buttons or manufacturer logos on the terminal 600, the fingerprint sensor 614 can be integrated with the physical buttons or manufacturer logos.

[0166] The optical sensor 615 is used to collect the ambient light intensity. In one embodiment, the processor 601 can control the display brightness of the display screen 605 according to the ambient light intensity collected by the optical sensor 615. Specifically, when the ambient light intensity is high, the display brightness of the display screen 605 is increased; when the ambient light intensity is low, the display brightness of the display screen 605 is decreased. In another embodiment, the processor 601 can also dynamically adjust the shooting parameters of the camera module 606 according to the ambient light intensity collected by the optical sensor 615.

[0167] A proximity sensor 616, also known as a distance sensor, is typically disposed on the front panel of the terminal 600. The proximity sensor 616 is used to collect the distance between the user and the front of the terminal 600. In one embodiment, when the proximity sensor 616 detects that the distance between the user and the front of the terminal 600 is gradually decreasing, the processor 601 controls the display screen 605 to switch from the lit state to the off state; when the proximity sensor 616 detects that the distance between the user and the front of the terminal 600 is gradually increasing, the processor 601 controls the display screen 605 to switch from the off state to the lit state.

[0168] Those skilled in the art can understand that Figure 6 the structure shown in does not constitute a limitation on the terminal 600, and may include more or fewer components than shown in the figure, or combine some components, or adopt a different component layout.

[0169] Figure 7 is a schematic structural diagram of a server provided by an embodiment of the present disclosure. The server 700 may vary greatly due to different configurations or performances, and may include one or more processors (central processing units, CPUs) 701 and one or more memories 702. Among them, at least one instruction is stored in the memory 702, and the at least one instruction is loaded and executed by the processor 701 to implement the methods provided by the above various method embodiments. Of course, the server may also have components such as a wired or wireless network interface, a keyboard, and an input / output interface for input / output. The server may also include other components for implementing the functions of the device, which will not be elaborated here.

[0170] In an exemplary embodiment, a computer-readable storage medium is also provided. For example, a memory including instructions, and the above instructions can be executed by a processor in the terminal to complete the control method of the current source type converter in the above embodiment. The computer-readable storage medium may be non-transitory. For example, the computer-readable storage medium may be a ROM (read-only memory), a RAM (random access memory), a CD-ROM, a magnetic tape, a floppy disk, and an optical data storage device, etc.

[0171] Those of ordinary skill in the art can understand that all or part of the steps of implementing the above embodiments can be completed by hardware, or can be completed by a program instructing relevant hardware. The program can be stored in a computer-readable storage medium, and the above-mentioned storage medium can be a read-only memory, a magnetic disk, or an optical disc, etc.

[0172] It should be noted that the information (including but not limited to user device information, user personal information, etc.), data (including but not limited to data for analysis, stored data, displayed data, etc.), and signals (including but not limited to signals transmitted between user terminals and other devices, etc.) involved in this disclosure are all authorized by users or fully authorized by all parties, and the collection, use, and processing of relevant data need to comply with the relevant laws, regulations, and standards of relevant countries and regions. For example, the "DC voltage output by the DC source type converter", "drive control signal", etc. involved in this disclosure are all obtained under full authorization.

[0173] The above are only optional embodiments of the present disclosure and are not intended to limit the present disclosure. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present disclosure shall be included within the protection scope of the present disclosure.

Claims

1. A control method for a current source type converter, characterized in that, The method includes: Detecting the DC voltage output by the DC source type converter; When the DC voltage is within the preset voltage range, determining a drive control signal based on the DC voltage, the DC voltage reference value, and a preset double-loop control algorithm; when the DC voltage exceeds the preset voltage range, determining a drive control signal based on the DC voltage, the DC voltage reference value, and a preset single-loop control algorithm, where the upper limit of the preset voltage range is the sum of the DC voltage reference value and a first fluctuation value, and the lower limit of the preset voltage range is the difference between the DC voltage reference value and a second fluctuation value, and the DC voltage reference value is the DC voltage that the target load driven by the current source type converter expects to input; Controlling a plurality of controllable switch devices in the current source type converter based on the determined drive control signal.

2. The method according to claim 1, wherein The preset double-loop control algorithm is a voltage-current double-loop control algorithm, and the preset single-loop control algorithm is a voltage single-loop control algorithm, a proportional control algorithm, a proportional-integral control algorithm, or a non-linear control algorithm.

3. The method according to claim 1, characterized in that, The step of when the DC voltage is within the preset voltage range, determining a drive control signal based on the DC voltage, the DC voltage reference value, and a preset double-loop control algorithm; when the DC voltage exceeds the preset voltage range, determining a drive control signal based on the DC voltage, the DC voltage reference value, and a preset single-loop control algorithm includes: When the DC voltage is within the preset voltage range, determining a voltage adjustment value based on the DC voltage, the DC voltage reference value, and a preset double-loop control algorithm; when the DC voltage exceeds the preset voltage range, determining a voltage adjustment value based on the DC voltage, the DC voltage reference value, and a preset single-loop control algorithm; Determining a drive control signal based on the determined voltage adjustment value.

4. The method according to claim 3, wherein The method further includes: When the DC voltage changes from being within the preset voltage range to exceeding the preset voltage range, using the voltage adjustment value finally output by the preset double-loop control algorithm as the initial value of the voltage adjustment value of the preset single-loop control algorithm.

5. The method according to claim 3, characterized in that, The method further includes: When the DC voltage changes from exceeding the preset voltage range to being within the preset voltage range, using the voltage adjustment value finally output by the preset single-loop control algorithm as the initial value of the voltage adjustment value of the preset double-loop control algorithm.

6. The method according to claim 1, wherein The method further includes: When the DC voltage rises to be greater than the DC upper threshold, controlling a plurality of controllable switch devices in the current source type converter to disconnect, so as to disconnect the charging circuit of the DC bus capacitor in the current source type converter; When the DC voltage drops to be less than the DC lower threshold, determining the drive control signal based on the DC voltage, the DC voltage reference value, and a preset single-loop control algorithm, where the DC lower threshold is less than the DC upper threshold and greater than the upper limit of the preset voltage range.

7. The method according to claim 6, characterized in that, The DC upper threshold is the sum of the DC voltage reference value and a third fluctuation value.

8. The method according to claim 6, characterized in that, The DC lower threshold is the difference between the DC voltage reference value and a fourth fluctuation value.

9. A control device for a current source type converter, characterized in that, The device includes: A detection module for detecting the DC voltage output by the DC source type converter; A determination module for determining a drive control signal based on the DC voltage, a DC voltage reference value, and a preset double-loop control algorithm when the DC voltage is within a preset voltage range, and determining a drive control signal based on the DC voltage, the DC voltage reference value, and a preset single-loop control algorithm when the DC voltage exceeds the preset voltage range, wherein the upper limit of the preset voltage range is the sum of the DC voltage reference value and a first fluctuation value, the lower limit of the preset voltage range is the difference between the DC voltage reference value and a second fluctuation value, and the DC voltage reference value is the DC voltage expected to be input by the target load driven by the current source type converter; A control module for controlling a plurality of controllable switch devices in the current source type converter based on the determined drive control signal.

10. A control circuit for a current source type converter, characterized in that, The control circuit includes a current source type converter and a controller; The controller is configured to: Detect the DC voltage output by the DC source type converter; When the DC voltage is within a preset voltage range, determine a drive control signal based on the DC voltage, a DC voltage reference value, and a preset double-loop control algorithm, and when the DC voltage exceeds the preset voltage range, determine a drive control signal based on the DC voltage, the DC voltage reference value, and a preset single-loop control algorithm, wherein the upper limit of the preset voltage range is the sum of the DC voltage reference value and a first fluctuation value, the lower limit of the preset voltage range is the difference between the DC voltage reference value and a second fluctuation value, and the DC voltage reference value is the DC voltage expected to be input by the target load driven by the current source type converter; Control a plurality of controllable switch devices in the current source type converter based on the determined drive control signal.

11. A computer device, characterized in that, The computer device includes a processor and a memory, and at least one instruction is stored in the memory, and the at least one instruction is loaded and executed by the processor to implement the operations performed by the control method of the current source type converter according to any one of claims 1 to 8.

12. A computer-readable storage medium, characterized in that, At least one instruction is stored in the storage medium, and the at least one instruction is loaded and executed by a processor to implement the operations performed by the control method of the current source type converter according to any one of claims 1 to 8.

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