Motor soft start two-phase control method and system

Abstract

The invention relates to the technical field of motor control, in particular to a motor soft start two-phase control method and system.The motor soft start two-phase control method comprises the steps that first current data and second current data are obtained in real time, and current loop data are obtained based on the first current data and the second current data; obtaining first thyristor trigger angle data and second thyristor trigger angle data based on the current loop data; obtaining thyristor follow current compensation time based on the first thyristor trigger angle data and the second thyristor trigger angle data, and obtaining a thyristor trigger angle adjustment parameter according to the thyristor follow current compensation time; and respectively adjusting a first thyristor trigger angle and a second thyristor trigger angle according to the thyristor trigger angle adjustment parameters. The method has the effects of balancing current unbalance between two phases, reducing the current unbalance degree of two-phase control soft start, reducing the power loss and reducing the damage to the motor caused by the current unbalance in two-phase control.

Description

Technical Field

[0001] The present invention relates to the technical field of motor control, and in particular to a motor soft-start two-phase control method and system. Background Art

[0002] The three phases of the traditional three-phase controlled soft starter UVW use the same trigger angle. By adjusting the same trigger angle from large to small, the same voltage ramp starting of the three phases UVW can be achieved. However, in two-phase control, one phase of UVW is connected by copper wire, so that the power supply segment and the motor segment of this phase are directly connected. The current will certainly be very high and the phase cannot be directly controlled. If the same trigger angle of the three-phase control is not still used at this time, it will cause very serious three-phase current imbalance.

[0003] At present, common motor control soft start technologies mainly include unidirectional thyristor control starting, bidirectional thyristor control starting and PWM control and other schemes. Among them, unidirectional thyristor control starting is mainly used for motors with lower power. By controlling the conduction time of the thyristor, the voltage is gradually increased to start the motor smoothly; bidirectional thyristors are used for motor starting in a larger power range. The purpose of controlling the motor is also achieved by adjusting the conduction angle of the thyristor; PWM control is to control the motor speed by modulating the pulse width to achieve voltage changes. Although these technologies have their own advantages, there are still problems such as current imbalance and large fluctuations during the starting process in actual applications, which make it impossible to meet the requirements of higher precision current control. Therefore, there is room for improvement. Summary of the invention

[0004] In order to balance the current imbalance between the two controlled phases, reduce the current imbalance of two-phase control soft start, reduce power loss, and reduce the damage to the motor caused by current imbalance in two-phase control, the present application provides a motor soft start two-phase control method and system.

[0005] The above-mentioned invention objective of the present application is achieved through the following technical solutions: A motor soft-start two-phase control method, the motor soft-start two-phase control comprising the steps of: Acquire first current data and second current data in real time, and acquire current loop data based on the first current data and the second current; Acquire first thyristor trigger angle data and second thyristor trigger angle data based on the current loop data; Acquire a thyristor freewheeling compensation time based on the first thyristor trigger angle data and the second thyristor trigger angle data, and acquire a thyristor trigger angle adjustment parameter according to the thyristor freewheeling compensation time; The first thyristor trigger angle and the second thyristor trigger angle are respectively adjusted according to the thyristor trigger angle adjustment parameter.

[0006] By adopting the above technical solution, during the process of starting the motor, one phase of the three-phase motor is connected by copper wire to make the power supply segment and the motor segment of the phase directly conductive, and the first current data and the second current data of the motor are obtained in real time by using the sensor device, the first current data refers to the current of one phase of the motor, and the second current data refers to the current of another phase of the motor, the current loop data is calculated according to the first current data and the second current data, and the trigger angle data of the first thyristor and the trigger angle data of the second thyristor in the current three-phase motor are obtained according to the current loop data, the first thyristor trigger angle data refers to the trigger angle of the first thyristor, and the second thyristor trigger angle data refers to the trigger angle of the first thyristor. The second thyristor trigger angle data is used to determine the trigger angle of the second thyristor. The first thyristor trigger angle data and the second thyristor trigger angle data are used to obtain the thyristor freewheeling compensation time. The thyristor trigger angle adjustment parameters are determined according to the thyristor freewheeling compensation time. The first thyristor trigger angle and the second thyristor trigger angle are dynamically regulated according to the thyristor trigger angle adjustment parameters, so as to more accurately offset the current imbalance caused by different freewheeling times, balance the current imbalance between the controlled two phases, reduce the current imbalance of the two-phase control soft start, reduce power loss, and reduce the damage to the motor due to current imbalance in the two-phase control.

[0007] In a preferred example, the present application may be further configured as follows: the real-time acquisition of the first current data and the second current data, and the acquisition of the current loop data based on the first current data and the second current, specifically include: Compare the first current data and the second current data with preset reference current data to obtain a current error; A current loop proportional coefficient and a current loop integral coefficient are obtained according to the current error, and current loop data are obtained based on the current loop proportional coefficient and the current loop integral coefficient.

[0008] By adopting the above technical solution, the two-phase current is obtained in real time through the current sensor in the three-phase motor circuit, which is recorded as the first current data and the second current data. The collected first current data and the second current data are compared with the preset reference current data, and the current error is calculated, which reflects the deviation between the actual current and the expected current. The current loop proportional coefficient and the current loop integral coefficient are generated according to the current error. The current loop proportional coefficient refers to the control quantity that is proportional to the current error of PI, which helps to quickly reduce the current error. The current error is integrated by using the obtained current loop integral coefficient, which can gradually reduce the current error until the three-phase motor reaches a stable state.

[0009] In a preferred example, the present application may be further configured as follows: the acquiring of the first thyristor trigger angle data and the second thyristor trigger angle data based on the current loop data specifically includes: Inputting the current loop data into a preset trigger angle data query table, wherein the trigger angle data query table is provided with a mapping relationship between the current loop data and the thyristor trigger angle adjustment amount, to obtain the corresponding trigger angle adjustment amount; The first thyristor trigger angle data and the second thyristor trigger angle data are acquired based on the trigger angle adjustment amount.

[0010] By adopting the above technical scheme, the obtained current loop data is input into a preset trigger angle data lookup table, and the corresponding trigger angle adjustment amount is obtained according to the mapping relationship between the current loop data and the thyristor trigger angle adjustment amount in the trigger angle data lookup table. The trigger angles of the first thyristor and the second thyristor are regulated according to the trigger angle adjustment amount, such as the direction and size of the trigger angle, to obtain the first thyristor trigger angle data and the second thyristor trigger angle data, thereby achieving preliminary regulation of the thyristor trigger angles of the controlled two phases according to the current loop, thereby reducing the current imbalance of the two-phase control soft start.

[0011] In a preferred example, the present application may be further configured as follows: the step of obtaining the thyristor freewheeling compensation time based on the first thyristor trigger angle data and the second thyristor trigger angle data, and obtaining the thyristor trigger angle adjustment parameter according to the thyristor freewheeling compensation time specifically includes: Acquire a first thyristor freewheeling time based on the first thyristor trigger angle data, and acquire a second thyristor freewheeling time based on the second thyristor trigger angle data; Obtaining a thyristor freewheeling compensation time according to the first thyristor freewheeling time and the second thyristor freewheeling time; A thyristor trigger angle adjustment parameter is determined based on the thyristor freewheeling compensation time.

[0012] By adopting the above technical scheme, after the trigger angle of the thyristor is initially adjusted by using the current loop, the first thyristor freewheeling time is obtained according to the first thyristor trigger angle data, and the corresponding second thyristor freewheeling time is obtained according to the second thyristor trigger angle data, and the first thyristor freewheeling time and the second thyristor freewheeling time are analyzed and processed in real time to obtain the thyristor freewheeling compensation time, and the thyristor trigger angle adjustment parameter is determined according to the thyristor freewheeling compensation time, so as to adjust the trigger time of the thyristor by monitoring and analyzing the freewheeling time of the thyristor to offset the difference in the freewheeling time, thereby offsetting the current imbalance of the controlled two phases.

[0013] In a preferred example, the present application may be further configured as follows: determining the thyristor trigger angle adjustment parameter based on the thyristor freewheeling compensation time specifically includes: Inputting the thyristor freewheeling compensation time into a preset compensation analysis model to obtain freewheeling time characteristics; Current balance information is acquired based on the freewheeling time characteristic, and a thyristor trigger angle adjustment parameter is determined according to the current balance information.

[0014] By adopting the above technical solution, after the thyristor freewheeling compensation time of the controlled two phases is obtained, the thyristor freewheeling compensation time is input into a preset compensation analysis model, and the compensation analysis model refers to a model used to perform compensation analysis on the thyristor freewheeling compensation time. The thyristor freewheeling compensation time is analyzed using the compensation analysis model to obtain the freewheeling time characteristics, and the current balance information is obtained according to the freewheeling time characteristics. The thyristor trigger angle adjustment parameters are determined according to the current balance information, so as to adjust the trigger time of the thyristor trigger angle according to the freewheeling compensation time to offset the current imbalance.

[0015] In a preferred example, the present application may be further configured as follows: after acquiring the first current data and the second current data in real time, the motor soft start two-phase control method further includes: Acquire voltage data of the controlled two phases based on the first current data and the second current data; Inputting the voltage data of the controlled two phases into a preset dynamic prediction model to obtain voltage loop data; A current balance control instruction is generated based on the voltage loop data and the current loop data.

[0016] By adopting the above technical scheme, the voltage data of the controlled two phases are obtained by using the first current data and the second current data, and the voltage data of the controlled two phases are input into a preset dynamic prediction model. The dynamic prediction model is used to analyze the voltage loop data of the motor system, and the outer loop of the motor system is constructed to ensure the stability and performance indicators of the motor. The motor is coordinated through the current loop data and the voltage loop data to achieve high-precision balance of the current at the controlled two-phase ends of the dual closed-loop control.

[0017] In a preferred example, the present application may be further configured as follows: generating a current balance control instruction based on the voltage loop data and the current loop data specifically includes: Determine motor current state information based on the first current data and the second current data, and determine a weight coefficient between current loop data and voltage loop data according to the current state information; A current balance control instruction is generated according to a weight coefficient between the current loop data and the voltage loop data.

[0018] By adopting the above technical scheme, the current state information of the motor is determined by the first current data and the second current data, the weight coefficient between the current loop data and the voltage loop data is determined according to the current state information, and the corresponding current balance instruction is generated according to the weight coefficient. Through weight distribution, the stability and performance indicators of the dual closed-loop control are ensured.

[0019] The second object of the invention is achieved by the following technical solutions: A motor soft-start two-phase control system, the motor soft-start two-phase control system comprises: a three-phase power supply, a three-phase motor, a first thyristor and a second thyristor, the three-phase power supply and the three-phase motor both comprise a U phase, a V phase and a W phase, the V phase is interconnected by a copper wire, the first thyristor is arranged on the U phase loop, the second thyristor is arranged on the W phase loop, the U phase and the W phase are provided with a power synchronization signal acquisition module and a current sampling module, the power synchronization signal acquisition module and the current sampling module are electrically connected to the thyristors.

[0020] By adopting the above technical solution, the trigger angle of the thyristor is regulated by using the power synchronization signal acquisition module and the current sampling module, so as to balance the current imbalance between the two controlled phases, reduce the current imbalance of the two-phase control soft start, reduce the power loss, and reduce the damage to the motor caused by the current imbalance in the two-phase control. The V phase in the two-phase control can be directly connected by wires. Compared with the traditional three-phase control, the present invention can save one-third of the components. Finally, a more compact structure can be achieved. At the same time, fewer components also allow the two-phase control to greatly reduce production costs.

[0021] In summary, the present application includes at least one of the following beneficial technical effects: 1. During the motor starting process, one phase of the three-phase motor is connected by copper wire to directly conduct the power supply segment and the motor segment of the phase, and the first current data and the second current data of the motor are obtained in real time by using the sensor device. The first current data refers to the current of one phase of the motor, and the second current data refers to the current of another phase of the motor. The current loop data is calculated based on the first current data and the second current data. The trigger angle data of the first thyristor and the trigger angle data of the second thyristor in the current three-phase motor are obtained based on the current loop data. The first thyristor trigger angle data refers to the trigger angle of the first thyristor, and the second thyristor trigger angle data refers to the trigger angle of the second thyristor. The trigger angle data of the second thyristor is used to obtain the thyristor freewheeling compensation time by using the first thyristor trigger angle data and the second thyristor trigger angle data, and the thyristor trigger angle adjustment parameters are determined according to the thyristor freewheeling compensation time. The first thyristor trigger angle and the second thyristor trigger angle are dynamically regulated according to the thyristor trigger angle adjustment parameters, so as to more accurately offset the current imbalance caused by different freewheeling times, balance the current imbalance between the controlled two phases, reduce the current imbalance degree of the two-phase control soft start, reduce the power loss, and reduce the damage to the motor caused by the current imbalance in the two-phase control; 2. Using the obtained current loop data to input into a preset trigger angle data query table, according to the mapping relationship between the current loop data and the thyristor trigger angle adjustment amount in the trigger angle data query table, the corresponding trigger angle adjustment amount is obtained, and the trigger angles of the first thyristor and the second thyristor are regulated according to the trigger angle adjustment amount, such as the direction and size of the trigger angle, to obtain the first thyristor trigger angle data and the second thyristor trigger angle data, so as to realize preliminary regulation of the thyristor trigger angles of the controlled two phases according to the current loop, and reduce the current imbalance of the two-phase control soft start; 3. After the trigger angle of the thyristor is initially regulated by the current loop, the first thyristor freewheeling time is obtained according to the first thyristor trigger angle data, and the corresponding second thyristor freewheeling time is obtained according to the second thyristor trigger angle data, and the first thyristor freewheeling time and the second thyristor freewheeling time are analyzed and processed in real time to obtain the thyristor freewheeling compensation time, and the thyristor trigger angle adjustment parameter is determined according to the thyristor freewheeling compensation time, so as to adjust the trigger time of the thyristor by monitoring and analyzing the freewheeling time of the thyristor to offset the difference in the freewheeling time, thereby offsetting the current imbalance of the controlled two phases; 4. Use the first current data and the second current data to obtain the voltage data of the controlled two phases, input the voltage data of the controlled two phases into a preset dynamic prediction model, use the dynamic prediction model to analyze the voltage loop data of the motor system, and construct the outer loop of the motor system to ensure the stability and performance indicators of the motor. Through the current loop data and the voltage loop data, the motor is coordinated to achieve high-precision balance of the current at the controlled two-phase ends of the dual closed-loop control. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 This is a flow chart of a two-phase control method for motor soft start in one embodiment of the present application; Figure 2 This is a flowchart for implementing step S10 in a two-phase control method for motor soft start in one embodiment of the present application; Figure 3 This is a flowchart for implementing step S20 in a two-phase control method for motor soft start in one embodiment of the present application; Figure 4 This is a flowchart for implementing step S30 in a two-phase control method for motor soft start in one embodiment of the present application; Figure 5 This is a flowchart for implementing step S33 in a two-phase control method for motor soft start in one embodiment of the present application; Figure 6 It is another implementation flow chart of a two-phase control method for motor soft start in one embodiment of the present application; Figure 7 This is a flowchart for implementing step S103 in a two-phase control method for motor soft start in one embodiment of the present application; Figure 8 It is a circuit diagram of a two-phase control system for motor soft start in one embodiment of the present application; Fig. 9 It is a circuit diagram for adjusting the thyristor trigger angle according to the current loop in a two-phase control method for motor soft start in one embodiment of the present application; Fig.10 It is a three-phase current diagram of a motor soft start two-phase control system without balanced processing in one embodiment of the present application; Fig.11 It is a three-phase current diagram after balanced processing of a two-phase control system for motor soft start in one embodiment of the present application; DETAILED DESCRIPTION In order to make the purpose, technical solutions and advantages of this application more clear, the following Figure 1-11 This application is described in further detail.

[0023] In one embodiment, if Figure 1 As shown, the present application discloses a two-phase control method for motor soft start, which specifically includes the following steps: S10: Acquire first current data and second current data in real time, and acquire current loop data based on the first current data and the second current.

[0024] Specifically, during the motor starting process, one phase of the three-phase motor is connected with a copper wire to make the power segment and the motor segment of this phase directly conductive, and the sensor device is used to obtain the first current data and the second current data of the motor in real time. The first current data refers to the current of one phase of the motor, and the second current data refers to the current of another phase of the motor. The current loop data is calculated based on the first current data and the second current data.

[0025] S20: Acquire first thyristor trigger angle data and second thyristor trigger angle data based on the current loop data.

[0026] Specifically, the trigger angle data of the first thyristor and the trigger angle data of the second thyristor in the current three-phase motor are obtained according to the current loop data. The first thyristor trigger angle data refers to the trigger angle of the first thyristor, and the second thyristor trigger angle data refers to the trigger angle of the second thyristor.

[0027] S30: Acquire a thyristor freewheeling compensation time based on the first thyristor trigger angle data and the second thyristor trigger angle data, and acquire a thyristor trigger angle adjustment parameter according to the thyristor freewheeling compensation time.

[0028] Specifically, the first thyristor trigger angle data and the second thyristor trigger angle data are used to obtain the thyristor freewheeling compensation time, and the thyristor trigger angle adjustment parameter is determined according to the thyristor freewheeling compensation time.

[0029] S40: adjusting the first thyristor trigger angle and the second thyristor trigger angle respectively according to the thyristor trigger angle adjustment parameter.

[0030] Specifically, the first thyristor trigger angle and the second thyristor trigger angle are dynamically regulated according to the thyristor trigger angle adjustment parameters, so as to more accurately offset the current imbalance caused by different follow-up times, balance the current imbalance between the controlled two phases, reduce the current imbalance of the two-phase control soft start, reduce power loss, and reduce the damage to the motor due to current imbalance in the two-phase control.

[0031] In this embodiment, during the motor starting process, one phase of the three-phase motor is connected by a copper wire so that the power supply segment and the motor segment of the phase are directly turned on, and the first current data and the second current data of the motor are obtained in real time by using a sensor device, the first current data refers to the current of one phase of the motor, and the second current data refers to the current of another phase of the motor, the current loop data is calculated according to the first current data and the second current data, and the trigger angle data of the first thyristor and the trigger angle data of the second thyristor in the current three-phase motor are obtained according to the current loop data, the first thyristor trigger angle data refers to the trigger angle of the first thyristor, and the second thyristor trigger angle data refers to the trigger angle of the second thyristor. The thyristor trigger angle data shows the trigger angle of the second thyristor, and the thyristor freewheeling compensation time is obtained by using the first thyristor trigger angle data and the second thyristor trigger angle data. The thyristor trigger angle adjustment parameters are determined according to the thyristor freewheeling compensation time. The first thyristor trigger angle and the second thyristor trigger angle are dynamically regulated according to the thyristor trigger angle adjustment parameters, so as to more accurately offset the current imbalance caused by different freewheeling times, balance the current imbalance between the controlled two phases, reduce the current imbalance of the two-phase control soft start, reduce power loss, and reduce the damage to the motor due to current imbalance in the two-phase control.

[0032] In one embodiment, if Figure 2 As shown, in step S10, the first current data and the second current data are acquired in real time, and the current loop data is acquired based on the first current data and the second current, which specifically includes: S11: Compare the first current data and the second current data with preset reference current data to obtain a current error.

[0033] S12: Obtain a current loop proportional coefficient and a current loop integral coefficient according to the current error, and obtain current loop data based on the current loop proportional coefficient and the current loop integral coefficient.

[0034] Specifically, the two-phase current is acquired in real time by the current sensor in the three-phase motor circuit, which is recorded as the first current data and the second current data. The collected first current data and the second current data are compared with the preset reference current data, and the current error is calculated, which reflects the deviation between the actual current and the expected current. The current loop proportional coefficient and the current loop integral coefficient are generated according to the current error. The current loop proportional coefficient refers to the control quantity of PI which is proportional to the current error, which helps to quickly reduce the current error. The current error is integrated using the obtained current loop integral coefficient, which can gradually reduce the current error until the three-phase motor reaches a stable state.

[0035] In one embodiment, if Figure 3 As shown, in step S20, the first thyristor trigger angle data and the second thyristor trigger angle data are obtained based on the current loop data, which specifically includes: S21: inputting the current loop data into a preset trigger angle data lookup table, wherein the trigger angle data lookup table is provided with a mapping relationship between the current loop data and the thyristor trigger angle adjustment amount, to obtain the corresponding trigger angle adjustment amount.

[0036] S22: Acquire first thyristor trigger angle data and second thyristor trigger angle data based on the trigger angle adjustment amount.

[0037] Specifically, the obtained current loop data is input into a preset trigger angle data query table, and the corresponding trigger angle adjustment amount is obtained according to the mapping relationship between the current loop data and the thyristor trigger angle adjustment amount in the trigger angle data query table. The trigger angles of the first thyristor and the second thyristor are regulated according to the trigger angle adjustment amount, such as the direction and size of the trigger angle, to obtain the first thyristor trigger angle data and the second thyristor trigger angle data, such as Fig. 9 As shown, the current loop data is generated using the first current data and the second current data, and then the corresponding trigger angle data is obtained through the current loop data, so as to achieve preliminary control of the thyristor trigger angles of the controlled two phases according to the current loop, thereby reducing the current imbalance of the two-phase control soft start.

[0038] In one embodiment, if Figure 4 As shown, in step S30, the thyristor freewheeling compensation time is obtained based on the first thyristor trigger angle data and the second thyristor trigger angle data, and the thyristor trigger angle adjustment parameter is obtained according to the thyristor freewheeling compensation time, which specifically includes: S31: acquiring a first thyristor freewheeling time based on the first thyristor trigger angle data, and acquiring a second thyristor freewheeling time based on the second thyristor trigger angle data.

[0039] S32: Obtaining a thyristor freewheeling compensation time according to the first thyristor freewheeling time and the second thyristor freewheeling time.

[0040] S33: Determine a thyristor trigger angle adjustment parameter based on the thyristor freewheeling compensation time.

[0041] Specifically, after the trigger angle of the thyristor is initially adjusted by using the current loop, the first thyristor freewheeling time is obtained according to the first thyristor trigger angle data, and the corresponding second thyristor freewheeling time is obtained according to the second thyristor trigger angle data. The first thyristor freewheeling time and the second thyristor freewheeling time are analyzed and processed in real time to obtain the thyristor freewheeling compensation time, and the thyristor trigger angle adjustment parameter is determined according to the thyristor freewheeling compensation time, so as to adjust the trigger time of the thyristor by monitoring and analyzing the freewheeling time of the thyristor to offset the difference in the freewheeling time, thereby offsetting the current imbalance of the controlled two phases.

[0042] In one embodiment, if Figure 5 As shown, in step S33, the thyristor trigger angle adjustment parameter is determined based on the thyristor freewheeling compensation time, specifically including: S331: Inputting the thyristor freewheeling compensation time into a preset compensation analysis model to obtain freewheeling time characteristics.

[0043] S332: Acquire current balance information based on the freewheeling time characteristic, and determine a thyristor trigger angle adjustment parameter according to the current balance information.

[0044] Specifically, after obtaining the thyristor freewheeling compensation time of the controlled two phases, the thyristor freewheeling compensation time is input into a preset compensation analysis model. The compensation analysis model refers to a model used to perform compensation analysis on the thyristor freewheeling compensation time. The thyristor freewheeling compensation time is analyzed using the compensation analysis model to obtain a freewheeling time characteristic. Current balance information is obtained based on the freewheeling time characteristic. The thyristor trigger angle adjustment parameter is determined based on the current balance information to adjust the trigger time of the thyristor trigger angle according to the freewheeling compensation time to offset the current imbalance.

[0045] In one embodiment, if Figure 6 As shown, after step S10, that is, after the first current data and the second current data are acquired in real time, the motor soft start two-phase control method further includes: S101: Acquire voltage data of controlled two phases based on the first current data and the second current data.

[0046] S102: Inputting the voltage data of the controlled two phases into a preset dynamic prediction model to obtain voltage loop data.

[0047] S103: Generate a current balance control instruction based on the voltage loop data and the current loop data.

[0048] Specifically, the voltage data of the controlled two phases are obtained using the first current data and the second current data, and the voltage data of the controlled two phases are input into a preset dynamic prediction model. The dynamic prediction model is used to analyze the voltage loop data of the motor system, and the outer loop of the motor system is constructed to ensure the stability and performance indicators of the motor. The motor is coordinated through the current loop data and the voltage loop data to achieve high-precision balance of the current at the controlled two-phase ends of the dual closed-loop control.

[0049] In one embodiment, if Figure 7 As shown, in step S103, a current balance control instruction is generated based on the voltage loop data and the current loop data, specifically including: S1031: Determine motor current state information based on the first current data and the second current data, and determine a weight coefficient between current loop data and voltage loop data according to the current state information.

[0050] S1032: Generate a current balance control instruction according to a weight coefficient between the current loop data and the voltage loop data.

[0051] Specifically, the current state information of the motor is determined by the first current data and the second current data, the weight coefficient between the current loop data and the voltage loop data is determined according to the current state information, and the corresponding current balance instruction is generated according to the weight coefficient. The stability and performance indicators of the dual closed-loop control are ensured through weight distribution. For example, when the current error is large, the weight of the inner loop can be increased to respond quickly and reduce the error; when the system tends to be stable, the weight of the outer loop can be appropriately increased to ensure the achievement of performance indicators. At a certain moment, the U-phase current has a large deviation, while the W-phase current is relatively stable. At this time, the collaborative control mechanism will detect this situation based on the data of the real-time information sharing platform, and dynamically increase the weight of the inner loop in the U-phase current control to correct the deviation more quickly. At the same time, since the W-phase current is relatively stable, the weight of the outer loop in the power or voltage control may be relatively increased to ensure that the overall performance indicators of the system are not affected.

[0052] It should be understood that the size of the serial numbers of the steps in the above embodiments does not mean the order of execution. The execution order of each process should be determined by its function and internal logic, and should not constitute any limitation on the implementation process of the embodiments of the present application.

[0053] In one embodiment, a two-phase control system for motor soft starting is provided, and the two-phase control system for motor soft starting corresponds one-to-one with the two-phase control method for motor soft starting in the above embodiment. Figure 8As shown, the motor soft start two-phase control system includes a three-phase power supply, a three-phase motor, a first thyristor and a second thyristor, the three-phase power supply and the three-phase motor both include a U phase, a V phase and a W phase, the V phase is interconnected by a copper wire, the first thyristor is arranged on the U phase loop, the second thyristor is arranged on the W phase loop, the U phase and the W phase are provided with a power synchronization signal acquisition module and a current sampling module, and the power synchronization signal acquisition module and the current sampling module are electrically connected to the thyristors.

[0054] Specifically, by using the power synchronization signal acquisition module and the current sampling module to adjust the trigger angle of the thyristor, the current imbalance between the two controlled phases can be balanced, the current imbalance of the two-phase control soft start can be reduced, the power loss can be reduced, and the damage to the motor caused by the current imbalance in the two-phase control can be reduced. The V phase in the two-phase control can be directly connected by a wire. Compared with the traditional three-phase control, the present invention can save one-third of the components. Ultimately, it can bring a more compact structure. At the same time, fewer components also allow the two-phase control to greatly reduce the production cost. In the two-phase control, if the three-phase control method is still used, the three-phase current is as follows Fig.10 As shown in the figure (the vertical scale is 1A and the horizontal scale is 0.1ms), the v phase is directly turned on, so its current is the largest, followed by the W phase current, and the W phase current is much larger than the U phase current. If it is not processed, it will cause serious current imbalance. The three-phase current using this method is as follows Fig.11 As shown in the figure (the vertical scale is 1A, the horizontal scale is 0.1ms), the U and W phase currents are almost equal, and the imbalance of the three-phase current is greatly reduced, which can make the motor start smoothly. The specific definition of the motor soft start two-phase control system can be found in the above definition of the motor soft start two-phase control method, which will not be repeated here. Each module in the above motor soft start two-phase control system can be implemented in whole or in part by software, hardware and a combination thereof. The above modules can be embedded in or independent of the processor in the computer device in the form of hardware, or can be stored in the memory in the computer device in the form of software, so that the processor can call and execute the operations corresponding to the above modules.

[0055] The embodiments described above are only used to illustrate the technical solutions of the present application, rather than to limit them. Although the present application has been described in detail with reference to the aforementioned embodiments, a person skilled in the art should understand that the technical solutions described in the aforementioned embodiments may still be modified, or some of the technical features may be replaced by equivalents. Such modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the embodiments of the present application, and should all be included in the protection scope of the present application.

Claims

1. A two-phase control method for motor soft start, characterized in that: The motor soft start two-phase control method comprises the steps of: Acquire first current data and second current data in real time, and acquire current loop data based on the first current data and the second current; Acquire first thyristor trigger angle data and second thyristor trigger angle data based on the current loop data; Acquire a thyristor freewheeling compensation time based on the first thyristor trigger angle data and the second thyristor trigger angle data, and acquire a thyristor trigger angle adjustment parameter according to the thyristor freewheeling compensation time; The first thyristor trigger angle and the second thyristor trigger angle are respectively adjusted according to the thyristor trigger angle adjustment parameter.

2. A motor soft start two-phase control method according to claim 1, characterized in that: The real-time acquisition of the first current data and the second current data, and the acquisition of the current loop data based on the first current data and the second current, specifically include: Compare the first current data and the second current data with preset reference current data to obtain a current error; A current loop proportional coefficient and a current loop integral coefficient are obtained according to the current error, and current loop data are obtained based on the current loop proportional coefficient and the current loop integral coefficient.

3. A motor soft start two-phase control method according to claim 1, characterized in that: The acquiring the first thyristor trigger angle data and the second thyristor trigger angle data based on the current loop data specifically includes: Inputting the current loop data into a preset trigger angle data query table, wherein the trigger angle data query table is provided with a mapping relationship between the current loop data and the thyristor trigger angle adjustment amount, to obtain the corresponding trigger angle adjustment amount; The first thyristor trigger angle data and the second thyristor trigger angle data are acquired based on the trigger angle adjustment amount.

4. A motor soft start two-phase control method according to claim 1, characterized in that: The step of acquiring the thyristor freewheeling compensation time based on the first thyristor trigger angle data and the second thyristor trigger angle data, and acquiring the thyristor trigger angle adjustment parameter according to the thyristor freewheeling compensation time specifically includes: Acquire a first thyristor freewheeling time based on the first thyristor trigger angle data, and acquire a second thyristor freewheeling time based on the second thyristor trigger angle data; Obtaining a thyristor freewheeling compensation time according to the first thyristor freewheeling time and the second thyristor freewheeling time; A thyristor trigger angle adjustment parameter is determined based on the thyristor freewheeling compensation time.

5. A motor soft start two-phase control method according to claim 4, characterized in that: The step of determining the thyristor trigger angle adjustment parameter based on the thyristor freewheeling compensation time specifically includes: Inputting the thyristor freewheeling compensation time into a preset compensation analysis model to obtain freewheeling time characteristics; Current balance information is acquired based on the freewheeling time characteristic, and a thyristor trigger angle adjustment parameter is determined according to the current balance information.

6. A motor soft start two-phase control method according to claim 1, characterized in that: After the first current data and the second current data are acquired in real time, the motor soft start two-phase control method further includes: Acquire voltage data of the controlled two phases based on the first current data and the second current data; Inputting the voltage data of the controlled two phases into a preset dynamic prediction model to obtain voltage loop data; A current balance control instruction is generated based on the voltage loop data and the current loop data.

7. A motor soft start two-phase control method according to claim 6, characterized in that: The generating of the current balance control instruction based on the voltage loop data and the current loop data specifically includes: Determine motor current state information based on the first current data and the second current data, and determine a weight coefficient between current loop data and voltage loop data according to the current state information; A current balance control instruction is generated according to a weight coefficient between the current loop data and the voltage loop data.

8. A motor soft-start two-phase control system, using a motor soft-start two-phase control method as claimed in any one of claims 1 to 7, characterized in that: The motor soft start two-phase control system includes: a three-phase power supply, a three-phase motor, a first thyristor and a second thyristor, the three-phase power supply and the three-phase motor both include a U phase, a V phase and a W phase, the V phase is interconnected by a copper wire, the first thyristor is arranged on the U phase loop, the second thyristor is arranged on the W phase loop, the U phase and the W phase are provided with a power synchronization signal acquisition module and a current sampling module, and the power synchronization signal acquisition module and the current sampling module are electrically connected to the thyristors.

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