CN113965061A - Forced commutation four-leg silicon controlled rectifier PWM soft starter and control method thereof - Google Patents

Forced commutation four-leg silicon controlled rectifier PWM soft starter and control method thereof Download PDF

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Publication number
CN113965061A
CN113965061A CN202111262861.3A CN202111262861A CN113965061A CN 113965061 A CN113965061 A CN 113965061A CN 202111262861 A CN202111262861 A CN 202111262861A CN 113965061 A CN113965061 A CN 113965061A
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China
Prior art keywords
thyristor
silicon controlled
controlled rectifier
circuit
capacitor
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CN202111262861.3A
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Chinese (zh)
Inventor
谢仕宏
梁力
孟彦京
杨智浩
梁荣茂
李博涛
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Shaanxi Hechuang Automation Engineering Co ltd
Shaanxi University of Science and Technology
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Shaanxi Hechuang Automation Engineering Co ltd
Shaanxi University of Science and Technology
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Priority to CN202111262861.3A priority Critical patent/CN113965061A/en
Publication of CN113965061A publication Critical patent/CN113965061A/en
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    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
    • H02M1/00—Details of apparatus for conversion
    • H02M1/36—Means for starting or stopping converters
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
    • H02M5/00—Conversion of ac power input into ac power output, e.g. for change of voltage, for change of frequency, for change of number of phases
    • H02M5/40—Conversion of ac power input into ac power output, e.g. for change of voltage, for change of frequency, for change of number of phases with intermediate conversion into dc
    • H02M5/42—Conversion of ac power input into ac power output, e.g. for change of voltage, for change of frequency, for change of number of phases with intermediate conversion into dc by static converters
    • H02M5/44—Conversion of ac power input into ac power output, e.g. for change of voltage, for change of frequency, for change of number of phases with intermediate conversion into dc by static converters using discharge tubes or semiconductor devices to convert the intermediate dc into ac
    • H02M5/453—Conversion of ac power input into ac power output, e.g. for change of voltage, for change of frequency, for change of number of phases with intermediate conversion into dc by static converters using discharge tubes or semiconductor devices to convert the intermediate dc into ac using devices of a triode or transistor type requiring continuous application of a control signal
    • H02M5/458—Conversion of ac power input into ac power output, e.g. for change of voltage, for change of frequency, for change of number of phases with intermediate conversion into dc by static converters using discharge tubes or semiconductor devices to convert the intermediate dc into ac using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only
    • 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

Abstract

The invention discloses a forced commutation four-leg silicon controlled rectifier PWM soft starter and a control method thereof, belonging to the technical field of AC-DC-AC frequency converters. The existing AC-DC-AC frequency converter starter has the problems of lower starting torque, more power switching devices and high cost. The invention provides a forced commutation four-bridge arm silicon controlled PWM (pulse-width modulation) soft starter and a control method thereof, wherein the forced commutation four-bridge arm silicon controlled PWM soft starter comprises a rectifying circuit, a filter circuit and an inverter circuit, the rectifying circuit and the inverter circuit are respectively connected with a power supply and a load, the input end of the filter circuit is connected with the output end of the rectifying circuit, the output end of the filter circuit is respectively connected with the input end of the inverter circuit and the W of a motor, and the output end of the inverter circuit is connected with U, V two phases of the motor. The PWM signal is adopted to control the controlled silicon to carry out forced commutation, thereby realizing step voltage regulation and variable frequency speed regulation, effectively reducing the number of power switch devices, reducing the production cost and improving the control performance of the soft starter.

Description

Forced commutation four-leg silicon controlled rectifier PWM soft starter and control method thereof
Technical Field
The invention belongs to the technical field of AC-DC-AC frequency converters, and particularly relates to a forced commutation four-leg silicon controlled PWM soft starter and a control method thereof.
Background
The AC-DC-AC frequency converter is widely applied to driving a three-phase AC asynchronous motor, the general traditional AC-DC-AC frequency converter mainly comprises a rectifier and an inverter, the rectifying part is a diode three-phase bridge type uncontrollable rectifier, and the rectifier is simple in structure, reliable in performance and easy to maintain. The inverter is a three-phase bridge circuit composed of I GBT and is widely applied to the market. Because the impact current is larger when the motor is directly started, the soft starter is usually adopted for starting, and the impact of the feedback current of the motor on a power grid can be prevented. The traditional thyristor voltage-regulating soft starter has lower starting torque, is difficult to be suitable for the on-load starting of a high-power motor, has the defects of more power switching devices due to the starting of the traditional AC-DC-AC frequency converter, increased equipment volume, high cost, higher price and the like, and causes the weak market competitiveness of the AC-DC-AC frequency converter for the soft starting of the high-power motor.
Disclosure of Invention
The invention aims to solve the problems in the prior art and provides a forced commutation four-leg silicon controlled rectifier PWM soft starter and a control method thereof.
In order to achieve the purpose, the invention adopts the following technical scheme to realize the purpose:
a four-bridge arm frequency conversion soft starter based on forced commutation comprises a rectifying circuit, a filter circuit and an inverter circuit, wherein the rectifying circuit and the inverter circuit are respectively connected with a power supply and a load, the input end of the filter circuit is connected with the output end of the rectifying circuit, the output end of the filter circuit is respectively connected with the input end of the inverter circuit and the W of a motor, and the output end of the inverter circuit is connected with U, V phases of the motor.
The rectifier circuit is a three-phase bridge type semi-controlled rectifier circuit and is used for realizing the secondary voltage regulation, the rectifier circuit comprises controllable silicon T1, T2, T3 and diodes D1, D2 and D3, and anodes of the controllable silicon T1, T2 and T3 are respectively connected with cathodes of the diodes D1, D2 and D3.
The filter circuit comprises a filter capacitor C1、C2And a filter inductance L1、L2Said filter capacitor C1Negative electrode and filter capacitor C2The output end of the filter circuit is connected with the positive electrode of the filter circuit through a filter inductor L1Filter inductor L2The filter capacitor C1 and the filter capacitor C2 are connected with an inverter circuit, the capacities of the filter capacitor C1 and the filter capacitor C2 are the same, the midpoint E of the filter capacitor C1 and the filter capacitor C2 is connected with the W of the motor, and the phase difference between the line voltage between U, W phases and the line voltage between V, W phases output by the inverter circuit is 60 degrees.
The inverter circuit comprises a main commutation circuit and an auxiliary commutation circuit,
the main current conversion circuit comprises a controllable silicon T4Silicon controlled rectifier T5Silicon controlled rectifier T6Silicon controlled rectifier T7Diode D4Diode D5Diode D6And a diode D7Said thyristor T4Cathode and thyristor T7Is connected with the anode of the thyristor T4Anode of (2) and diode D4Is connected to the cathode of the thyristor T7Cathode and diode D7Is connected with the anode of the thyristor T6Cathode and thyristor T5Is connected with the anode of the thyristor T6Anode of (2) and diode D6Is connected to the cathode of the thyristor T5Cathode and diode D5The anode of the anode is connected with the anode,
the auxiliary current conversion circuit comprises a controllable silicon T4ASilicon controlled rectifier T5ASilicon controlled rectifier T6ASilicon controlled rectifier T7AInductor L3Inductor L4Capacitor C3And a capacitorC4，
The controllable silicon T4Anode of and silicon controlled rectifier T4AIs connected with the anode of the thyristor T7Cathode and thyristor T7AIs connected to the cathode of the thyristor T4ACathode of (2) and thyristor T7AAnode of (2) and capacitor C3Is connected to the capacitor C3Another end of (1) and an inductor L3Connection of said inductance L3The other end of the motor is connected with a U phase of the motor,
the controllable silicon T6Anode of and silicon controlled rectifier T6AIs connected with the anode of the thyristor T5Cathode and thyristor T5AIs connected to the cathode of the thyristor T6ACathode of (2) and thyristor T5AAnode of (2) and capacitor C4Is connected to the capacitor C4Another end of (1) and an inductor L4Connection of said inductance L4The other end of the motor is connected with a V phase of the motor,
the controllable silicon T4Silicon controlled rectifier T4ASilicon controlled rectifier T7Silicon controlled rectifier T7ASilicon controlled rectifier T5Silicon controlled rectifier T5ASilicon controlled rectifier T6Silicon controlled rectifier T6AThe gate of the power supply is connected with the controller and is used for receiving the control signal,
the capacitor C3Inductor L3Silicon controlled rectifier T4Silicon controlled rectifier T7Silicon controlled rectifier T4ASilicon controlled rectifier T7AIs used for realizing the U-phase current conversion of the motor,
the capacitor C4Inductor L4Silicon controlled rectifier T5Silicon controlled rectifier T6Silicon controlled rectifier T5ASilicon controlled rectifier T6AThe method is used for realizing the V-phase commutation of the motor.
In another aspect of the present invention, a method for controlling a four-leg frequency conversion soft starter based on forced commutation is provided, where the method includes: the PWM signal is adopted to control an inverter circuit, the inverter circuit outputs voltage to drive a motor to rotate, the amplitude of the output voltage of the inverter circuit is controlled by changing the width of a pulse, and the modulation period is changed to control the frequency output by the inverter circuit.
The method further comprises the following steps: u phaseThe current conversion is divided into the first half period current conversion and the second half period current conversion, and the first half period current conversion adopts PWM signals to control the controllable silicon T4Silicon controlled rectifier T4AThe later half period current conversion adopts PWM signal to control the controlled silicon T7Silicon controlled rectifier T7AThe second half period current conversion process is the same as the first half period current conversion process, and the first half period current conversion process is as follows: initial thyristor T4Is passing all line current, preparing for thyristor T4Carrying out forced commutation, capacitor C3Is charged to Ud, and the initial charging is triggered by the simultaneous triggering of the thyristors T4And thyristor T4ATo build, with thyristor T4ATo start commutation, the resonant current starts in the circuit T4A-C3-L3-T4Is built up from a thyristor T4Subtracting it from the current flowing in it when the thyristor T4When the internal current is zero, the rest resonant current circularly flows through the diode D4When the peak current is reached, the capacitor C3 discharges to zero and then begins to charge in the reverse direction, during which time the diode D is charged4Reverse voltage drop to help thyristor T4Turn-off, thyristor T in the first half cycle4The control method of the V-phase commutation is the same as that of the U-phase commutation when the V-phase commutation is required to be switched on and off for a plurality of times.
Compared with the prior art, the invention has the following beneficial effects:
the invention provides a forced commutation four-bridge arm silicon controlled rectifier PWM soft starter and a control method thereof, which uses silicon controlled rectifier to replace I GBT and other power devices, uses PWM signal to control the silicon controlled rectifier to carry out forced commutation, adopts four-switch control, can realize the grade voltage regulation and frequency conversion speed regulation, effectively reduces the number of power switch devices, reduces the volume and the weight of an inverter, and improves the control performance of the soft starter, thereby improving the working efficiency of a frequency conversion circuit.
Drawings
FIG. 1 is a topological diagram of a forced commutation four-bridge arm silicon controlled PWM soft starter of the invention;
FIG. 2 is a diagram of the output voltage waveforms of two phases of the inverter circuit of the soft starter of the present invention relative to a reference phase C;
FIG. 3 is a waveform of the rotational speed at which the motor of the present invention reaches a power frequency of 50 Hz;
fig. 4 is a waveform diagram of electromagnetic torque when the motor of the present invention is stably operated.
Detailed Description
The invention is described in further detail below with reference to the accompanying drawings:
the embodiment of the invention provides a forced commutation four-bridge arm silicon controlled PWM (pulse-width modulation) soft starter, which is shown in figure 1 and comprises a rectifying circuit, a filter circuit and an inverter circuit, wherein the rectifying circuit and the inverter circuit are respectively connected with a power supply and a load, the input end of the filter circuit is connected with the output end of the rectifying circuit, the output end of the filter circuit is respectively connected with the input end of the inverter circuit and W of a motor, and the output end of the inverter circuit is connected with U, V phases of the motor.
The rectification circuit is a three-phase bridge type semi-controlled rectification circuit for realizing the secondary voltage regulation and comprises a controllable silicon T1、T2、T3And a diode D1、D2、D3Said thyristor T1、T2、T3Respectively with the diode D1、D2、D3Is connected to the cathode.
The filter circuit comprises a filter capacitor C1、C2And a filter inductance L1、L2Said filter capacitor C1Anode and thyristor T1、T2、T3Is connected to the cathode of the filter capacitor C1Negative electrode and filter capacitor C2The positive pole of the filter capacitor C2Cathode and diode D1、D2、D3The output end of the filter circuit is connected with the anode of the filter circuit through a filter inductor L1Filter inductor L2The filter capacitor C1 and the filter capacitor C2 are connected with an inverter circuit, the capacities of the filter capacitor C1 and the filter capacitor C2 are the same, the midpoint E of the filter capacitor C1 and the filter capacitor C2 is connected with the W of the motor, and the phase difference between the line voltage between U, W phases and the line voltage between V, W phases output by the inverter circuit is 60 degrees.
The midpoint E between the filter capacitor C1 and the filter capacitor C2 is connected to the W of the motor, and the phase of the line voltage between U, W phases and the phase of the line voltage between V, W phases output by the inverter circuit are 60 ° different from each other, so that a symmetrical three-phase waveform is formed with respect to the motor, a rotating magnetic field is generated, and the motor can be driven to rotate.
The inverter circuit comprises a main commutation circuit and an auxiliary commutation circuit,
the main current conversion circuit comprises a controllable silicon T4Silicon controlled rectifier T5Silicon controlled rectifier T6Silicon controlled rectifier T7Diode D4Diode D5Diode D6And a diode D7Said thyristor T4Cathode and thyristor T7Is connected with the anode of the thyristor T4Anode of (2) and diode D4Is connected to the cathode of the thyristor T7Cathode and diode D7Is connected with the anode of the thyristor T6Cathode and thyristor T5Is connected with the anode of the thyristor T6Anode of (2) and diode D6Is connected to the cathode of the thyristor T5Cathode and diode D5The anode of the anode is connected with the anode,
the auxiliary current conversion circuit comprises a controllable silicon T4ASilicon controlled rectifier T5ASilicon controlled rectifier T6ASilicon controlled rectifier T7AInductor L3Inductor L4Capacitor C3And a capacitor C4，
The controllable silicon T4Anode of and silicon controlled rectifier T4AIs connected with the anode of the thyristor T7Cathode and thyristor T7AIs connected to the cathode of the thyristor T4ACathode of (2) and thyristor T7AAnode of (2) and capacitor C3Is connected to the capacitor C3Another end of (1) and an inductor L3Connection of said inductance L3The other end of the motor is connected with a U phase of the motor,
the controllable silicon T6Anode of and silicon controlled rectifier T6AIs connected with the anode of the thyristor T5Cathode and thyristor T5AIs connected to the cathode of the thyristor T6ACathode of (2) and thyristor T5AAnode of (2) and capacitor C4Is connected to the capacitor C4Another end of (1) and an inductor L4Connection of said inductance L4The other end of the motor is connected with a V phase of the motor,
the controllable silicon T4Silicon controlled rectifier T4ASilicon controlled rectifier T7Silicon controlled rectifier T7ASilicon controlled rectifier T5Silicon controlled rectifier T5ASilicon controlled rectifier T6Silicon controlled rectifier T6AThe gate of the power supply is connected with the controller and is used for receiving the control signal,
the capacitor C3Inductor L3Silicon controlled rectifier T4Silicon controlled rectifier T7Silicon controlled rectifier T4ASilicon controlled rectifier T7AIs used for realizing the U-phase current conversion of the motor,
the capacitor C4Inductor L4Silicon controlled rectifier T5Silicon controlled rectifier T6Silicon controlled rectifier T5ASilicon controlled rectifier T6AThe method is used for realizing the motor V phase change. .
The embodiment of the invention also provides a control method of the forced commutation four-bridge arm silicon controlled PWM soft starter,
the basic theory of sinusoidal pulse width modulation is that in sampling control, when narrow pulses with equal impulses and different shapes are applied to the same link with inertia, the effect is basically the same. Wherein, impulse refers to the area of the narrow pulse; the effect is basically the same, which means that the output response waveforms of the links are basically the same.
The PWM signal is adopted to control an inverter circuit, the inverter circuit outputs voltage to drive a motor to rotate, the amplitude of the output voltage of the inverter circuit is controlled by changing the width of a pulse, and the modulation period is changed to control the frequency output by the inverter circuit.
Referring to fig. 2-4, fig. 2 shows output voltage waveforms of two phases of the soft starter inverter circuit U, V relative to the reference phase C, the inverted output voltages U, V are 60 ° different from each other, the circuit adopts a thyristor device as a switching device, and the basic working mode of the inverter circuit is controlled by PWM instead of the traditional 180 ° square wave.
FIG. 3 is a driveThe rotating speed of the motor when operating at 50Hz is controlled by PWM signal to control the SCR T in the inverter circuit4、T5、T6、T7And auxiliary thyristor T4A、T5A、T6A、T7AThe output voltage drives the motor to rotate, the amplitude of the inversion output voltage can be controlled by changing the width of the pulse, and the frequency of the inversion output can be controlled by changing the modulation period.
The control method of the V-phase current conversion is the same as that of the U-phase current conversion. Taking U-phase as an example for analysis, the U-phase converter circuit comprises a controllable silicon T4、T7Auxiliary silicon controlled rectifier T4A、T7ACapacitor C3Inductor L3The U-phase current conversion is divided into a first half-period current conversion and a second half-period current conversion, and the first half-period current conversion adopts PWM signals to control the controllable silicon T4Silicon controlled rectifier T4AThe later half period current conversion adopts PWM signal to control the controlled silicon T7Silicon controlled rectifier T7AThe second half period current conversion process is the same as the first half period current conversion process, and the first half period current conversion process is as follows: initial thyristor T4Is passing all line current, preparing for thyristor T4Carrying out forced commutation, capacitor C3Is charged to Ud, and the initial charging is triggered by the simultaneous triggering of the thyristors T4And thyristor T4ATo build, with thyristor T4ATo start commutation, the resonant current starts in the circuit T4A-C3-L3-T4Is built up from a thyristor T4Subtracting it from the current flowing in it when the thyristor T4When the internal current is zero, the rest resonant current circularly flows through the diode D4When the peak current is reached, the capacitor C3 discharges to zero and then begins to charge in the reverse direction, during which time the diode D is charged4Reverse voltage drop to help thyristor T4Turn-off, thyristor T in the first half cycle4The switching-on and switching-off are carried out for a plurality of times, which is different from 180-degree square wave control, so that the current conversion process is carried out for a plurality of times in the first half period, and the purpose of PWM control is achieved.
FIG. 4 is a waveform diagram of electromagnetic torque and capacitance C during stable operation of the motor1And a capacitor C2The middle point E of the inverter is connected with the W of the motor, so that the output of the inverter circuit is U,The phase difference between the line voltage of the W phase and the line voltage of the V, W phase is 60 degrees, and a symmetrical three-phase waveform is formed in practice relative to the motor, a rotating magnetic field is generated, and therefore the motor can be driven to rotate stably.
The above is only a preferred embodiment of the present invention, and is not intended to limit the present invention, and various modifications and changes will occur to those skilled in the art. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims (6)

1. The four-leg frequency conversion soft starter based on forced commutation is characterized by comprising a rectifying circuit, a filter circuit and an inverter circuit, wherein the rectifying circuit and the inverter circuit are respectively connected with a power supply and a load, the input end of the filter circuit is connected with the output end of the rectifying circuit, the output end of the filter circuit is respectively connected with the input end of the inverter circuit and W of a motor, and the output end of the inverter circuit is connected with U, V phases of the motor.
2. The four-leg frequency conversion soft starter based on forced commutation according to claim 1, wherein the rectification circuit is a three-phase bridge semi-controlled rectification circuit for realizing the secondary voltage regulation, and comprises a thyristor T1、T2、T3And a diode D1、D2、D3Said thyristor T1、T2、T3Respectively with the diode D1、D2、D3Is connected to the cathode.
3. The forced commutation-based four-leg frequency conversion soft starter according to claim 1, wherein the filter circuit comprises a filter capacitor C1、C2And a filter inductance L1、L2Said filter capacitor C1Negative electrode and filter capacitor C2The output end of the filter circuit is connected with the positive electrode of the filter circuit through a filter inductor L1Filter for filteringWave inductor L2The filter capacitor C1 and the filter capacitor C2 are connected with an inverter circuit, the capacities of the filter capacitor C1 and the filter capacitor C2 are the same, the midpoint E of the filter capacitor C1 and the filter capacitor C2 is connected with the W of the motor, and the phase difference between the line voltage between U, W phases and the line voltage between V, W phases output by the inverter circuit is 60 degrees.
4. The four-leg frequency conversion soft starter based on forced commutation according to claim 1, wherein the inverter circuit comprises a main commutation circuit and an auxiliary commutation circuit,
the main current conversion circuit comprises a controllable silicon T4Silicon controlled rectifier T5Silicon controlled rectifier T6Silicon controlled rectifier T7Diode D4Diode D5Diode D6And a diode D7Said thyristor T4Cathode and thyristor T7Is connected with the anode of the thyristor T4Anode of (2) and diode D4Is connected to the cathode of the thyristor T7Cathode and diode D7Is connected with the anode of the thyristor T6Cathode and thyristor T5Is connected with the anode of the thyristor T6Anode of (2) and diode D6Is connected to the cathode of the thyristor T5Cathode and diode D5The anode of the anode is connected with the anode,
the auxiliary current conversion circuit comprises a controllable silicon T4ASilicon controlled rectifier T5ASilicon controlled rectifier T6ASilicon controlled rectifier T7AInductor L3Inductor L4Capacitor C3And a capacitor C4，
The controllable silicon T4Anode of and silicon controlled rectifier T4AIs connected with the anode of the thyristor T7Cathode and thyristor T7AIs connected to the cathode of the thyristor T4ACathode of (2) and thyristor T7AAnode of (2) and capacitor C3Is connected to the capacitor C3Another end of (1) and an inductor L3Connection of said inductance L3The other end of the motor is connected with a U phase of the motor,
the controllable silicon T6Anode of and silicon controlled rectifier T6AIs connected with the anode of the thyristor T5Cathode and thyristor T5AIs connected to the cathode of the thyristor T6ACathode of (2) and thyristor T5AAnode of (2) and capacitor C4Is connected to the capacitor C4Another end of (1) and an inductor L4Connection of said inductance L4The other end of the motor is connected with a V phase of the motor,
the controllable silicon T4Silicon controlled rectifier T4ASilicon controlled rectifier T7Silicon controlled rectifier T7ASilicon controlled rectifier T5Silicon controlled rectifier T5ASilicon controlled rectifier T6Silicon controlled rectifier T6AThe gate of the power supply is connected with the controller and is used for receiving the control signal,
the capacitor C3Inductor L3Silicon controlled rectifier T4Silicon controlled rectifier T7Silicon controlled rectifier T4ASilicon controlled rectifier T7AIs used for realizing the U-phase current conversion of the motor,
the capacitor C4Inductor L4Silicon controlled rectifier T5Silicon controlled rectifier T6Silicon controlled rectifier T5ASilicon controlled rectifier T6AThe method is used for realizing the V-phase commutation of the motor.
5. A control method of a four-leg frequency conversion soft starter based on forced commutation according to claim 4, characterized by comprising the following steps: the PWM signal is adopted to control an inverter circuit, the inverter circuit outputs voltage to drive a motor to rotate, the amplitude of the output voltage of the inverter circuit is controlled by changing the width of a pulse, and the modulation period is changed to control the frequency output by the inverter circuit.
6. The method for controlling the four-leg frequency conversion soft starter based on forced commutation according to claim 5, wherein the method further comprises: the U-phase current conversion is divided into the first half period current conversion and the second half period current conversion, and the first half period current conversion adopts PWM signals to control the controllable silicon T4Silicon controlled rectifier T4AThe later half period current conversion adopts PWM signal to control the controlled silicon T7Silicon controlled rectifier T7AThe second half period current conversion process is the same as the first half period current conversion process, and the first half period current conversion process is as follows: most preferablyInitial thyristor T4Is passing all line current, preparing for thyristor T4Carrying out forced commutation, capacitor C3Is charged to Ud, and the initial charging is triggered by the simultaneous triggering of the thyristors T4And thyristor T4ATo build, with thyristor T4ATo start commutation, the resonant current starts in the circuit T4A-C3-L3-T4Is built up from a thyristor T4Subtracting it from the current flowing in it when the thyristor T4When the internal current is zero, the rest resonant current circularly flows through the diode D4When the peak current is reached, the capacitor C3 discharges to zero and then begins to charge in the reverse direction, during which time the diode D is charged4Reverse voltage drop to help thyristor T4Turn-off, thyristor T in the first half cycle4The control method of the V-phase commutation is the same as that of the U-phase commutation when the V-phase commutation is required to be switched on and off for a plurality of times.
CN202111262861.3A 2021-10-28 2021-10-28 Forced commutation four-leg silicon controlled rectifier PWM soft starter and control method thereof Pending CN113965061A (en)

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