CN114094879A - High-voltage matrix type variable-frequency soft start device and control method - Google Patents
High-voltage matrix type variable-frequency soft start device and control method Download PDFInfo
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02P—CONTROL OR REGULATION OF ELECTRIC MOTORS, ELECTRIC GENERATORS OR DYNAMO-ELECTRIC CONVERTERS; CONTROLLING TRANSFORMERS, REACTORS OR CHOKE COILS
- H02P1/00—Arrangements for starting electric motors or dynamo-electric converters
- H02P1/16—Arrangements for starting electric motors or dynamo-electric converters for starting dynamo-electric motors or dynamo-electric converters
- H02P1/26—Arrangements for starting electric motors or dynamo-electric converters for starting dynamo-electric motors or dynamo-electric converters for starting an individual polyphase induction motor
- H02P1/28—Arrangements for starting electric motors or dynamo-electric converters for starting dynamo-electric motors or dynamo-electric converters for starting an individual polyphase induction motor by progressive increase of voltage applied to primary circuit of motor
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02P—CONTROL OR REGULATION OF ELECTRIC MOTORS, ELECTRIC GENERATORS OR DYNAMO-ELECTRIC CONVERTERS; CONTROLLING TRANSFORMERS, REACTORS OR CHOKE COILS
- H02P1/00—Arrangements for starting electric motors or dynamo-electric converters
- H02P1/16—Arrangements for starting electric motors or dynamo-electric converters for starting dynamo-electric motors or dynamo-electric converters
- H02P1/26—Arrangements for starting electric motors or dynamo-electric converters for starting dynamo-electric motors or dynamo-electric converters for starting an individual polyphase induction motor
- H02P1/30—Arrangements for starting electric motors or dynamo-electric converters for starting dynamo-electric motors or dynamo-electric converters for starting an individual polyphase induction motor by progressive increase of frequency of supply to primary circuit of motor
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02P—CONTROL OR REGULATION OF ELECTRIC MOTORS, ELECTRIC GENERATORS OR DYNAMO-ELECTRIC CONVERTERS; CONTROLLING TRANSFORMERS, REACTORS OR CHOKE COILS
- H02P3/00—Arrangements for stopping or slowing electric motors, generators, or dynamo-electric converters
- H02P3/06—Arrangements for stopping or slowing electric motors, generators, or dynamo-electric converters for stopping or slowing an individual dynamo-electric motor or dynamo-electric converter
- H02P3/18—Arrangements for stopping or slowing electric motors, generators, or dynamo-electric converters for stopping or slowing an individual dynamo-electric motor or dynamo-electric converter for stopping or slowing an ac motor
Abstract
The invention discloses a high-voltage matrix type frequency conversion soft start device and a control method, wherein an AYA MU matrix converter main component is used as a soft starter motor driving core link, so that the problems of complicated structure, large volume, more power devices, high cost and inconvenience for general popularization of a traditional frequency converter starting motor are solved; the main controller adopts a DSP high-frequency digital signal processing chip as a core element to carry out high-speed analysis, conversion, filtering, detection, modulation and demodulation on signals of the main controller; the input end of the motor is provided with a current-voltage sensor, the measured current value is compared with a preset value of a set starting current, the duty ratio of the driving pulse of the main component of the AYA MU matrix converter is adjusted, the output frequency and the output voltage of the soft starter are reduced, the current of the motor is reduced, the rotating speed of the motor is controlled, and the impact load is reduced.
Description
Technical Field
The invention belongs to the technical field of automatic control, and particularly relates to a high-voltage matrix type frequency conversion soft-start device and a control method of the high-voltage matrix type frequency conversion soft-start device.
Background
In the industrial field, for a large-sized high-voltage motor, the current can reach hundreds of amperes at the starting moment, the impact on a power grid is very large, the normal work of other loads carried by the same power grid can be influenced, and the insulation of a high-voltage motor winding is also extremely unfavorable because the starting current of the load is too large. Therefore, a large high-voltage motor generally needs to be subjected to soft starting, namely, the voltage applied in the initial starting stage is lower than the rated voltage, the common soft starting comprises soft starter starting and autotransformer voltage reduction starting, the autotransformer voltage reduction starting is firstly applied with the voltage of 60-80% of the rated voltage in the initial starting stage of the high-voltage motor, the high-voltage motor is switched to the rated voltage to work after rotating, the voltage applied to the motor by the soft starter is gradually changed from zero to the rated voltage, the starting process is smoother, the starting effect is better, the impact on a power grid and the damage to a winding are smaller, the soft starting is better than the autotransformer voltage reduction starting, and the soft starter has the advantages in industrial application.
However, the traditional soft starter at present enables the input voltage of a controlled motor to change according to different requirements by controlling the conduction angles of three opposite parallel thyristors, and is mainly used for occasions of voltage reduction starting and stopping, the rotating speed of the motor cannot be adjusted, the torque is limited, and zero-voltage zero-impact starting cannot be realized; the problem can be overcome by using the frequency converter to start the motor, but the traditional high-voltage frequency converter has the defects of complex structure, large volume, more power devices and higher cost, so that the traditional high-voltage frequency converter is not convenient to popularize generally, therefore, how to realize the frequency conversion type soft start with small volume and low cost has profound market value, the high-voltage matrix type frequency conversion soft start device and the control method are produced in the background, the rotating speed of the motor can be controlled, the impact load is reduced, the starting torque can reach 100%, the starting time is flexibly set, the starting current can be gentle and controlled below the rated current, the volume can be reduced, and the cost is reduced.
The AYA MU matrix converter master component of the present invention is described in detail in the patent literature: the high-frequency matrix type light-weight totally-enclosed high-voltage frequency conversion device is named as a high-frequency matrix type light-weight totally-enclosed high-voltage frequency conversion device with the application number of CN202110537937.2, the notice number of CN113037101B and the authorization number of ZL 202110537937.2.
Disclosure of Invention
The invention aims to provide a high-voltage matrix type frequency conversion soft start device, which solves the problems that the traditional soft starter in the prior art is mainly used for the occasions of voltage reduction starting and stopping by controlling the conduction angles of three opposite parallel thyristors, the rotating speed of a motor is not adjustable, the torque is limited, and zero-voltage zero-impact starting cannot be realized, and the starting of the motor by using a frequency converter is inconvenient to popularize due to the fact that the traditional high-voltage frequency converter is complex in structure, large in size, more in power devices and high in cost, the output frequency and the output voltage of the soft starter are reduced, the current of the motor is reduced, the purposes of meeting the requirement on controlling the rotating speed of the motor, reducing the impact load, enabling the starting torque to reach 100%, and enabling the starting current to be smooth and controlled below the rated current by flexibly setting the starting time are achieved.
The high-voltage matrix type frequency conversion soft start device comprises an input contact group connected with a high-voltage power supply, wherein the contact group is sequentially connected with an AYA MU matrix converter main component and an output contact group, the input contact group, the AYA MU matrix converter main component and the output contact group are connected with a main controller through a high-speed optical fiber network, data are transmitted in a bidirectional and real-time manner, the main controller is connected with a current and voltage sensor a and a current and voltage sensor b, the high-voltage matrix type frequency conversion soft start device also comprises a bypass switch connected between the high-voltage power supply and the high-voltage motor, and the main controller is connected with an HMI operation panel and the bypass switch through control cables.
The invention adopts the main part of the AYA MU matrix converter as the driving core link of the soft starter motor, the frequency conversion unit comprises nine integrated modules, the nine integrated modules are divided into three groups, the input end of each integrated module is connected with one phase of the output end of the input contactor group, the output end of each integrated module is connected with three phases of the input end of the output contactor group, each integrated module is composed of eight anti-series IGBT sub-modules and a driving circuit thereof in series, and the frequency conversion driving system which uses the low-voltage high-frequency IGBT as the basic component unit and meets the application requirement of the high-voltage occasion is formed.
The main controller is a DSP high-frequency digital signal processing chip and is loaded with a PWM (pulse-width modulation) duty ratio algorithm program to perform high-speed analysis, transformation, filtering, detection, modulation and demodulation on a main controller signal; the input end and the output end of the matrix type soft starter are respectively provided with a current sensor and a voltage sensor, the running current, the voltage and the phase position of a motor are detected, a control system acquires the current of the motor, the current value is compared with a preset value of the set starting current, if the feedback current is less than the set current, the duty ratio of the driving pulse of the IGBT is increased through PI operation, so that the output frequency and the output voltage of the soft starter are improved, the current of the motor is increased, if the feedback current is greater than the set current, the duty ratio of the driving pulse of the IGBT is reduced through PI operation, so that the output frequency and the output voltage of the soft starter are reduced, the current of the motor is reduced, the purposes of meeting the rotating speed of the control motor, reducing the impact load, enabling the starting torque to reach 100 percent, enabling the starting current to be smooth and controlled below the rated current by flexibly setting the starting time of MU, and the main component of the AYA matrix converter can run in four quadrants, the energy of the motor is fed back to the power grid, when the motor needs to be stopped, a soft stop function can be put into use, so that the motor can be stopped quickly, and the stop time of the motor can be flexibly controlled.
The input contactor group comprises a contactor a, a contactor b and a contactor c which are arranged in parallel, the input ends of the contactor a, the contactor b and the contactor c are respectively connected with three phases of a high-voltage power supply, the output ends of the contactor a, the contactor b and the contactor c are respectively connected with the main component of the AYA MU matrix converter, and the input ends and the output ends of the contactor a, the contactor b and the contactor c are respectively connected with the main controller.
The output contactor group comprises a contactor e, a contactor f and a contactor g which are arranged in parallel, the input ends of the contactor e, the contactor f and the contactor g are all connected with the main component of the AYA MU matrix converter, the output ends of the contactor e, the contactor f and the contactor g are respectively connected with the three phases of the high-voltage motor, and the input ends and the output ends of the contactor e, the contactor f, the contactor g are all connected with the main controller.
The main controller and the HMI operation panel are both connected with an external auxiliary power supply.
The second technical scheme adopted by the invention is that the control method of the high-voltage matrix type variable-frequency soft start device comprises the following specific control processes:
after power-on, checking all hardware, and if the device is abnormal during testing, simultaneously cutting off an input contact set, an output contact set and a bypass switch by a main controller;
the high-voltage power of 10kVA at the power grid side is transmitted to the soft start device through the high-voltage power supply, the bypass switch is in a closed state initially, the current enters the input contact group, and the current flows into the main component of the AYA MU matrix converter after undervoltage or voltage loss protection is carried out;
the main controller and the HMI operation panel are started through an external auxiliary power supply, after initialization setting, the communication state is scanned, after stable and normal communication is ensured, a control instruction is input to the main controller through the HMI operation panel, a PWM modulation duty ratio algorithm is started to carry out chopping control on the output voltage of the main component of the AYA MU matrix converter, and the chopped wave control is input to an output contact group;
detecting the running current, voltage and phase of the high-voltage motor through a current-voltage sensor a, inputting a preset starting current value into a main controller in advance, acquiring the input current of the high-voltage motor as a feedback current by the main controller through the current-voltage sensor a, comparing the feedback current with the preset starting current value, and increasing the duty ratio of driving pulses in a main component of the AYA MU matrix converter if the feedback current is not greater than the preset starting current value; if the feedback current is larger than the preset value of the starting current, reducing the duty ratio of the driving pulse in the main component of the AYA MU matrix converter;
after the high-voltage motor is normally started, the main controller sends an instruction to cut off the input contact group and the output contact group, and switches on the bypass switch, so that the soft start process is completed;
when the high-voltage motor needs to be stopped, the power switch device in the main component of the AYA MU matrix converter automatically runs in the reverse direction, after a user sends an instruction to the main controller through the HMI operation panel, a control signal is sent to switch on the input contact group, a PWM (pulse-width modulation) program in the main controller is started, the output voltage waveform is modulated to be synchronous with the voltage of a power grid, then the output contact group is switched on, the bypass switch is switched off, and the high-voltage motor is controlled to be stopped at a reduced speed.
The invention has the beneficial effects that:
the invention relates to a high-voltage matrix type frequency conversion soft start device and a control method.A main component of an AYA MU matrix type high-voltage frequency converter is used as a soft starter motor driving link, a frequency conversion unit comprises 9 integrated modules, each integrated module is formed by connecting 8 anti-series IGBT sub-modules and driving circuits thereof in series, and a frequency conversion driving system which takes a low-voltage high-frequency IGBT as a basic composition unit and meets the application requirements of high-voltage occasions is formed; the problems that the high-voltage frequency converter is complex in structure, large in size, more in power devices, high in cost and inconvenient to popularize due to the fact that the traditional frequency converter is used for starting the motor are solved; the output contactor and the bypass switch are arranged, the motor main loop is flexibly and automatically switched, the safety and reliability are high, the duty ratio of the drive pulse of the IGBT is adjusted through PI operation, the output frequency and the output voltage of the soft starter are reduced, the motor current is reduced, the requirement of controlling the motor rotating speed and reducing the impact load is met, the starting torque can reach 100%, the heavy load starting characteristic of the soft starter is greatly improved, the main part of the AYA MU matrix converter can run in four quadrants, the energy of the motor is fed back to a power grid, when the motor needs to be stopped, the soft stopping function can be put into use, the motor can be stopped quickly, and the stopping time of the motor can be flexibly controlled.
Drawings
FIG. 1 is a schematic structural diagram of a high-voltage matrix frequency conversion soft start device and a control method thereof according to the present invention;
FIG. 2 is an assembled front view of the high-voltage matrix frequency conversion soft start device and the control method of the present invention;
FIG. 3 is a side view of the assembled high voltage matrix frequency conversion soft start device and control method of the present invention;
FIG. 4 is a perspective view of the assembled high-voltage matrix frequency conversion soft start device and control method of the present invention;
FIG. 5 is a schematic diagram of the electrical schematic of the main components of the AYA MU matrix converter of the present invention.
In the figure, 1, input contactor group, 2, AYA MU matrix converter main unit, 3, output contactor group, 4, current and voltage sensors a, 5, main controller, 6, HMI operation panel, 7, bypass switch, 8, current and voltage sensor b.
Detailed Description
The present invention will be described in detail below with reference to the accompanying drawings and specific embodiments.
The invention relates to a high-voltage matrix type frequency conversion soft start device and a control method, wherein the circuit connection relation is shown in figure 1, a high-voltage power supply is from a 10kV high-voltage power grid and respectively comprises an A phase, a B phase and a C phase, the high-voltage power supply is connected with an input contact group 1, an AYA MU matrix converter main part 2 and an output contact group 3 through high-voltage cables in sequence, the output contact group 3 is used for connecting a high-voltage motor, a bypass switch 7 is connected between the high-voltage power supply and the high-voltage motor, when the input contact group 1 and the output contact group 3 are disconnected and only the bypass switch 7 is switched on, the high-voltage power supply and the high-voltage motor are connected by common cables, the input contact group 1, the AYA MU matrix converter main part 2 and the output contact group 3 are all controlled by a high-speed optical fiber connector 5, the bidirectional real-time transmission of data can be realized, the main controller 5 is connected with a current and voltage sensor a4, the current and voltage sensor a4 is connected with the input end of the high-voltage motor and used for collecting the voltage, the current and the phase of the input end of the high-voltage motor, the main controller 5 is connected with the current and voltage sensor b8, the current and voltage sensor b8 is connected with the output end of the high-voltage power and used for collecting the voltage, the current and the phase of the output end of the high-voltage power, the main controller 5 is also connected with the HMI operation panel 6 and the bypass switch 7, when the bypass switch 7 is disconnected and the input contactor group 1 and the output contactor group 3 are connected, the voltage and the current input into the high-voltage motor can be controlled, and the entity diagrams of all the components are shown in fig. 2, fig. 3 and fig. 4.
As shown in fig. 5, the AYA MU matrix converter main part 2 includes 9 parallel integrated modules, each integrated module is composed of 8 anti-series IGBT sub-modules, and a soft starter core driving part which uses low-voltage high-frequency IGBTs as basic constituent units and meets the application requirements of high-voltage occasions is achieved.
The main controller 5 is a DSP high-frequency digital signal processing chip, and is loaded with a PWM (pulse-width modulation) duty ratio algorithm program, so that the received signals can be analyzed, converted, filtered, detected, modulated and demodulated at high speed.
The input contactor group 1 comprises a contactor a, a contactor B and a contactor C which are arranged in parallel, wherein the input ends of the contactor a, the contactor B and the contactor C are respectively connected with three phases of a high-voltage power supply, namely the contactor a is connected with a phase A of the high-voltage power supply, the contactor B is connected with a phase B of the high-voltage power supply, the contactor C is connected with a phase C of the high-voltage power supply, the output ends of the contactor a, the contactor B and the contactor C are respectively connected with an AYA MU matrix converter main part 2, the input ends and the output ends of the contactor a, the contactor B and the contactor C are respectively connected with a main controller 5, the bidirectional data transmission of the contactor a, the contactor B, the contactor C and the main controller 5 can be realized, the contactor a, the contactor B and the contactor C can receive the connection or disconnection instructions of the main controller 5, the main controller 5 can receive signals of the contactor a, the contactor B and the contactor C which are connected into a circuit, and the contactor a, the contactor C, the contactor B and the contactor C, the contactor B, the contactor C, the contactor B and the contactor C, the contactor C and the contactor C, the contactor B and the contactor C, the contactor B, the contactor C, the contactor B, the contactor C, the contactor are connected into the contactor C, the contactor and the contactor, the contactor C, the contactor and the contactor C, the contactor and the contactor, the contactor C, the contactor and the contactor are connected into the contactor B, the contactor C, the contactor B, the contactor C, the, And starting a PWM (pulse-width modulation) duty ratio algorithm program after the contactor b and the contactor c are connected into the circuit.
The output contactor group 3 comprises a contactor e, a contactor f and a contactor g which are arranged in parallel, the input ends of the contactor e, the contactor f and the contactor g are all connected with the AYA MU matrix converter main component 2, the output ends of the contactor e, the contactor f and the contactor g are respectively connected with the three phases of the high-voltage motor, namely, the contactor e is connected with the phase A circuit at the input end of the high-voltage motor, the contactor f is connected with the phase B circuit at the input end of the high-voltage motor, the contactor g is connected with the phase C circuit at the input end of the high-voltage motor, the contactor e, the contactor f, the input end and the output end of the contactor g are all connected with the main controller 5, the contactor e, the contactor f, the contactor g and the main controller 5 transmit data in two directions, the main controller 5 can receive signals of the contactor e, the contactor f and the contactor g which are connected into the circuits, and can send out commands to control the contactor e, the contactor f and the contactor g to be switched in or out of a circuit.
Current-voltage sensor a4 includes 3 voltage sensor, 3 current sensor, and one of them voltage sensor, a current sensor input are connected high-voltage motor input end looks, can measure voltage, electric current on every phase line, and 3 voltage sensor, 3 current sensor output all connect main control unit 5 with the voltage, electric current, the phase place transmission that detect to main control unit 5, and the main control unit 5 of being convenient for regulates and control the output of AYA MU matrix converter main unit 2.
The current and voltage sensor b8 comprises 3 voltage sensors and 3 current sensors, wherein the input end of one voltage sensor and the input end of one current sensor are connected with one phase of the high-voltage power supply, the output end of the voltage sensor and the input end of the current sensor are connected with the main controller 5, and the current and voltage sensor b8 is used for measuring the three-phase voltage, the current and the phase output by the high-voltage power supply and transmitting the three-phase voltage, the current and the phase output by the high-voltage power supply to the main controller 5.
In the present invention, the AYA MU matrix converter main unit 2 includes a frequency conversion unit, and the structure of the frequency conversion unit is shown in fig. 5, and the frequency conversion unit includes nine integrated modules, which are: the integrated module a, the integrated module B, the integrated module C, the integrated module d, the integrated module e, the integrated module f, the integrated module g, the integrated module h and the integrated module i, wherein the input sides of the integrated module a, the integrated module d and the integrated module g are all connected with the phase A of a high-voltage power supply, the input sides of the integrated module B, the integrated module e and the integrated module h are all connected with the phase B of the high-voltage power supply, the input sides of the integrated module C, the integrated module f and the integrated module i are all connected with the phase C of the high-voltage power supply, nine integrated modules are all connected with the main controller 5, the output sides of the integrated module a, the integrated module B and the integrated module C are all connected with the contactor e, the output sides of the integrated module d, the integrated module e and the integrated module f are all connected with the contactor f, the output sides of the integrated module g, the integrated module h and the integrated module i are all connected with the contactor g, each integrated module is composed of eight IGBT submodules in series connection with the driving circuits, the soft starter core driving component which takes the low-voltage high-frequency IGBT as a basic component unit and meets the application requirement of a high-voltage occasion is achieved, wherein each integrated module is formed by connecting eight anti-series IGBT sub-modules and driving circuits thereof in series; the anti-series IGBT submodule adopts an insulated gate bipolar transistor element with 4500V voltage level.
The main controller 5 and the HMI operation panel 6 are both connected with an external auxiliary power supply and used for controlling the initial starting of the main controller 5 and the HMI operation panel 6.
The invention discloses a high-voltage matrix type frequency conversion soft start device and a control method, wherein the real-time process comprises the following steps:
after the power is on, all hardware is checked, if the device is abnormal during testing, the main controller 5 can simultaneously cut off the input contact group 1, the output contact group 3 and the bypass switch 7, so that the soft start device is in a safe maintenance independent state, and the indication elements of all devices are ensured to display normal and the network communication is smooth.
The high-voltage electricity of 10kVA on the power grid side is transmitted to the soft start device through the high-voltage power supply, the bypass switch 7 is in a closed state initially, the current enters the input contact group 1, and the current flows into the main component 2 of the AYA MU matrix converter after undervoltage or voltage loss protection.
The main controller 5 and the HMI operation interface are started by an external auxiliary power supply, after initialization setting, the communication state is scanned, after stable and normal communication is ensured, instructions are respectively output to the main part 2 of the AYA MU matrix converter through an optical fiber network according to preset algorithm software, programs carry out chopping control through a duty ratio PWM modulation algorithm, voltage output waveforms are modulated, the IGBT adopts an insulated gate bipolar transistor element with 4500V voltage level, and the modulated voltage enters the output contact group 3.
The current and voltage sensor a4 detects the running current, voltage and phase of the high-voltage motor, firstly, a starting current preset value is input into the main controller 5, the main controller 5 collects the input current of the high-voltage motor through the current and voltage sensor a4, the current value is compared with the set starting current preset value, if the feedback current is smaller than the starting current preset value, the main controller 5 increases the duty ratio of the driving pulse of the IGBT in the AYA MU matrix converter main part 2 through PI operation, thereby increasing the output frequency and output voltage of the soft starter, increasing the current of the high-voltage motor, if the feedback current of the output sensor group is larger than the starting current preset value, the main controller 5 decreases the duty ratio of the driving pulse of the IGBT in the AYA MU matrix converter main part 2 through PI operation, thereby reducing the output frequency and output voltage of the soft starter, and reducing the current of the high-voltage motor, the process only needs to be set up once in the device commissioning phase, and then the soft starter one-click operation can be completed.
After the high-voltage motor normally starts, the main controller 5 sends an instruction to cut off the input contactor group 1 and the output contactor group 3, the bypass switch 7 is switched on, the soft start process is completed, the high-voltage power supply output end is connected with the current-voltage sensor b8, the main controller 5 outputs the voltage phase of the high-voltage power supply output end through the detection of the current-voltage sensor b8, the voltage phase matched with the high-voltage power supply is output through the modulation bypass switch 7, the soft start process switching main loop is completely synchronously completed with the high-voltage power supply, the synchronous disturbance-free switching of the power supply is realized, and the high-voltage motor is in a normal operation state.
The AYA MU matrix converter main unit 2 can realize four-quadrant operation, the energy of the high voltage motor is fed back to the power grid, when the high voltage motor needs to stop, the power switch device in the AYA MU matrix converter main unit 2 automatically runs in reverse direction, during the period, after the software in the main controller 5 receives the user stop command from the HMI operation panel 6, the software sends control signal to switch on the input contact group 1 of the matrix converter, starts the PWM modulation program in the main controller 5 of the matrix converter, modulates the output voltage waveform to be synchronous with the power grid voltage, then switches on the output contact group 3 of the matrix converter, and switches off the bypass switch 7, so that the converter controls the high voltage motor to stop at a reduced speed, the high voltage motor stops running at a faster speed, and the stop time of the high voltage motor is flexibly controlled.
According to the high-voltage matrix type frequency conversion soft start device and the control method, an AYA MU matrix converter main part is used as a soft starter motor driving core link, a frequency conversion unit comprises 9 integrated modules, each integrated module is formed by connecting 8 anti-series IGBT sub-modules and driving circuits thereof in series, and a soft start system which takes a low-voltage high-frequency IGBT as a basic composition unit and meets the application requirements of high-voltage occasions is formed; the problems that the high-voltage frequency converter is complex in structure, large in size, more in power devices, high in cost and inconvenient to popularize due to the fact that the traditional frequency converter is used for starting the motor are solved; the main controller adopts a DSP high-frequency digital signal processing chip as a core element to carry out high-speed analysis, conversion, filtering, detection, modulation and demodulation on signals of the main controller; the output end of the matrix type soft starter is provided with a current sensor, the current value is compared with a preset value of starting current, and the duty ratio of the driving pulse of the IGBT is adjusted, so that the output frequency and the output voltage of the soft starter are reduced, the current of the motor is reduced, the rotating speed of the motor is controlled, the impact load is reduced, and the starting torque can reach 100%.
Claims (7)
1. The high-voltage matrix type frequency conversion soft start device is characterized by comprising an input contactor group (1) connected with a high-voltage power supply, wherein the contactor group (1) is sequentially connected with an AYA MU matrix converter main component (2) and an output contactor group (3), the input contactor group (1), the AYA MU matrix converter main component (2) and the output contactor group (3) are all connected with a main controller (5), the main controller (5) is connected with a current-voltage sensor a (4), the main controller (5) is also connected with a current-voltage sensor b (8), the device further comprises a bypass switch (7) connected between the high-voltage power supply and the high-voltage motor, the main controller (5) is connected with an HMI operation panel (6) and the bypass switch (7),
the main controller (5) is a DSP high-frequency digital signal processing chip and is loaded with a PWM (pulse-width modulation) duty ratio algorithm program.
2. The high-voltage matrix frequency conversion soft start device according to claim 1, wherein the input contact group (1) comprises a contactor a, a contactor b and a contactor c which are arranged in parallel, the output ends of the contactor a, the contactor b and the contactor c are all connected with the AYA MU matrix converter main component (2), and the input ends and the output ends of the contactor a, the contactor b and the contactor c are all connected with the main controller (5).
3. The high-voltage matrix frequency conversion soft start device according to claim 1, wherein the output contact group (3) comprises a contactor e, a contactor f and a contactor g which are arranged in parallel, the input ends of the contactor e, the contactor f and the contactor g are all connected with the AYA MU matrix converter main component (2), and the contactor e, the contactor f and the contactor g are all connected with the main controller (5) through control cables.
4. The high-voltage matrix frequency conversion soft start device according to claim 1, wherein said AYA MU matrix converter main unit (2) comprises a frequency conversion unit, said frequency conversion unit comprises nine integrated modules, said nine integrated modules are divided into three groups, the input end of each group of integrated modules is connected with one phase of the output end of the contactor group (1), and the output end of each group of integrated modules is connected with three phases of the input end of the output contactor group (3).
5. The high-voltage matrix frequency conversion soft start device according to claim 4, wherein each integrated module is composed of eight anti-series IGBT sub-modules and driving circuits thereof connected in series.
6. The high-voltage matrix frequency conversion soft start device according to claim 1, wherein the main controller (5) and the HMI operation panel (6) are connected with an external auxiliary power supply.
7. A control method of a high-voltage matrix type variable-frequency soft start device is characterized by comprising the following specific control processes:
after being electrified, all hardware is checked, and if the device is abnormal during testing, the main controller (5) simultaneously cuts off the input contact group (1), the output contact group (3) and the bypass switch (7);
the high-voltage power of 10kVA on the power grid side is transmitted to the soft start device through the high-voltage power supply, the bypass switch (7) is in a closed state initially, the current enters the input contact group (1), and the current flows into the main component (2) of the AYA MU matrix converter after undervoltage or voltage loss protection;
the main controller (5) and the HMI operation panel (6) are started through an external auxiliary power supply, after initialization setting, the communication state is scanned, after the communication is ensured to be stable and normal, a control instruction is input to the main controller (5) through the HMI operation panel (6), a PWM (pulse-width modulation) duty ratio algorithm is started to carry out chopping control on the output voltage of the main component (2) of the AYA MU matrix converter, and the output voltage is input to the output contact group (3);
detecting the running current, voltage and phase of a high-voltage motor through a current-voltage sensor a (4), inputting a starting current preset value into a main controller (5) in advance, acquiring the input current of the high-voltage motor as a feedback current by the main controller (5) through the current-voltage sensor a (4), comparing the feedback current with a set starting current preset value, and if the feedback current is not greater than the starting current preset value, increasing the duty ratio of driving pulses in an AYA MU matrix converter main component (2); if the feedback current is larger than the preset value of the starting current, reducing the duty ratio of the driving pulse in the main component (2) of the AYA MU matrix converter;
after the high-voltage motor is normally started, the main controller (5) sends an instruction to cut off the input contactor group (1) and the output contactor group (3) and enables the bypass switch (7) to be switched on, the soft start process is completed, the output end of the high-voltage power supply is connected with the current-voltage sensor b (8), the main controller (5) outputs a voltage phase matched with the high-voltage power supply through the current-voltage sensor b (8) according to the voltage phase of the output end of the high-voltage power supply detected by the current-voltage sensor b (8), the high-voltage motor and the high-voltage power supply are guaranteed to completely synchronously complete the soft start process switching main loop, and synchronous undisturbed switching of the power supply is realized;
when the high-voltage motor needs to be stopped, the power switch device in the AYA MU matrix converter main component (2) automatically runs in the reverse direction, after a user sends an instruction to the main controller (5) through the HMI operation panel (6), a control signal is sent to switch on the input contact group (1), a PWM modulation program in the main controller (5) is started, the output voltage waveform is modulated to be synchronous with the voltage of a power grid, then the output contact group (3) is switched on, the bypass switch (7) is switched off, and the high-voltage motor is controlled to be stopped in a speed reduction mode.
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