CN109150061B - High-power electric power frequency conversion switching system and control method thereof - Google Patents
High-power electric power frequency conversion switching system and control method thereof Download PDFInfo
- Publication number
- CN109150061B CN109150061B CN201811100426.9A CN201811100426A CN109150061B CN 109150061 B CN109150061 B CN 109150061B CN 201811100426 A CN201811100426 A CN 201811100426A CN 109150061 B CN109150061 B CN 109150061B
- Authority
- CN
- China
- Prior art keywords
- circuit unit
- relay
- module
- power
- alternating current
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Active
Links
Images
Classifications
-
- 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
- H02P27/00—Arrangements or methods for the control of AC motors characterised by the kind of supply voltage
- H02P27/04—Arrangements or methods for the control of AC motors characterised by the kind of supply voltage using variable-frequency supply voltage, e.g. inverter or converter supply voltage
- H02P27/045—Arrangements or methods for the control of AC motors characterised by the kind of supply voltage using variable-frequency supply voltage, e.g. inverter or converter supply voltage whereby the speed is regulated by measuring the motor speed and comparing it with a given physical value
Landscapes
- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Control Of Ac Motors In General (AREA)
- Inverter Devices (AREA)
Abstract
The invention mainly discloses a high-power electric power frequency conversion switching system and a control method thereof, wherein the system comprises an acquisition circuit unit, a judgment circuit unit, a control circuit unit, an execution circuit unit and an electric control loop unit; the acquisition circuit unit is connected with the judgment circuit unit, and the judgment circuit unit is connected with the control circuit unit and the execution circuit unit; the execution circuit unit is connected with the electric control loop unit; the electric control loop unit is connected with the motor; the acquisition circuit unit comprises an acquisition signal module, a rectification module, a power supply signal processing module and a comparison signal processing module; the judging circuit unit comprises an amplifying circuit module and a phase detection circuit module; the invention effectively improves the success rate of switching, can quickly and accurately capture phase synchronization, has simple and efficient system, increases the switching stability and success rate after the system is simple, effectively reduces the cost of the system, and can be produced and processed in batches.
Description
Technical Field
The invention relates to the field of frequency converters, in particular to a high-power electric power frequency conversion switching system and a control method thereof.
Background
In order to save cost, only one frequency converter and two motors are generally selected to be used at the production site, so that conversion from power frequency to frequency conversion is required; the low-power motor has low requirement on the phase of a power grid due to small load, and the power frequency conversion can be successfully switched; however, for a high-power motor, the motor is separated from a power grid to operate when in operation, the load of the motor is large, the motor has excitation impact, the rotating speed of the motor is reduced too much along with the increase of the operating time of the motor, and the slip impact starts to rise remarkably; the initial phase of the output voltage of the frequency converter is random and uncertain, even if the frequency of the output voltage of the frequency converter is equal to the frequency of the power frequency voltage, the initial phases of the output three-phase power supply and the power frequency power supply are inconsistent, various problems in the switching process are caused due to the inconsistent phases, and the problem of converting the frequency conversion of the high-power motor into the power frequency is more complicated.
Disclosure of Invention
In order to solve the problems existing in the high-power motor during power frequency conversion switching, the invention provides a high-power motor power frequency conversion switching system and a control method thereof.
A high-power electric power industry frequency conversion switching system comprises:
the acquisition circuit unit is used for acquiring the voltage of two-phase electricity of the power grid and the voltage of two-phase electricity output by the frequency converter in phase;
the judging circuit unit is used for comparing the acquired voltage and the phase signal;
the control circuit unit is used for controlling the acquisition circuit unit and the judgment circuit unit to move back and forth until corresponding control requirements are met;
the execution circuit unit is mainly used for executing the conduction work of the electric control loop unit;
the electric control circuit unit controls the motor to complete phase locking of output waveforms and controls the main circuit switching circuit unit to complete conversion work of power frequency conversion;
the acquisition circuit unit is connected with the judgment circuit unit, and the judgment circuit unit is connected with the control circuit unit and the execution circuit unit; the execution circuit unit is connected with the electric control loop unit; and the electric control loop unit is connected with the motor.
The acquisition circuit unit comprises an acquisition signal module, a rectification module, a power supply signal processing module and a comparison signal processing module; the signal acquisition module is connected with the rectification module, and the rectification module is divided into a first rectification bridge and a second rectification bridge; the first rectifier bridge is connected with the power signal processing module, and the second rectifier bridge is connected with the comparison signal processing module; the signal acquisition module is respectively connected with the transformer T1 and the transformer T2; the transformer T1 is connected with the first rectifier bridge, and the first rectifier bridge is connected with the power signal processing module and processed into a power signal; the transformer T2 is connected with a second rectifier bridge, and the second rectifier bridge is connected with the comparison signal processing module and processed into a comparison signal; the power supply signal processing module is connected with the circuit board and provides power supply for the circuit board; the comparison signal processing module is an lm324 comparator.
The judging circuit unit comprises an amplifying circuit module and a phase detection circuit module; the amplifying circuit module is connected with the phase detection circuit module; the judging circuit unit controls the conduction of the first switch and the second switch through the output pin, so that the switch controls the circuit unit to act, and the action points of the first switch and the second switch are adjusted through a potentiometer R6; when the phase detection circuit module detects that the phases are consistent, the detection control of the phases is completed through the pull-in turn-off of the switch three-control relay K1; when the phase detection circuit module detects that the phases are inconsistent, the control circuit unit controls the acquisition circuit unit and the judgment circuit unit to perform acquisition and judgment again until the phases are consistent.
The electric control loop unit comprises a frequency converter extension relay, a phase detection relay, an alternating current contactor KM1, a time relay KT, an intermediate relay KA, an alternating current contactor KM2 and a starting button SB 1; the frequency converter extension relay and the phase detection relay are connected in series; the phase detection relay is connected with a normally closed contact I of an alternating current contactor KM2 and a normally open contact of an intermediate relay KA in series; the starting button SB1 is connected in series with a starting button SB2, a normally closed contact of an intermediate relay KA, a normally closed contact II of an alternating current contactor KM2 and a normally open contact of an alternating current contactor KM 1; the time relay KT is connected with a normally open contact in series with a starting button SB3, an alternating current contactor KM1 normally closed contact and an alternating current contactor KM2 normally open contact.
A frequency conversion switching control method for high-power electric machinery comprises the following steps:
a. the acquisition circuit module acquires two-phase electricity of a power grid and voltage of the two-phase electricity output by the frequency converter in a same phase, one part of the voltage is converted into voltage in a controllable range through the transformer TI, and the voltage is rectified through a rectifier bridge I formed by connecting D1, D2, D3 and D4 rectifiers in parallel and then processed into a power signal through the power signal processing module; one part of the voltage is converted into voltage in a controllable range through a transformer T2, and is rectified through a rectifier bridge II formed by connecting a D5 rectifier, a D6 rectifier, a D7 rectifier and a D8 rectifier in parallel, and then is processed into a comparison signal through a comparison signal processing module;
b. the judgment circuit unit is used for comparing the acquired comparison signal with the set parameter of the system after the comparison signal is amplified by the operational amplifier U1, and when the comparison signal is consistent with the set parameter, the judgment circuit unit is used for transmitting the judgment signal to the execution circuit unit; when the comparison signal is inconsistent with the set parameter, the judgment circuit unit transmits the judgment signal to the control circuit unit; the control circuit unit controls the acquisition circuit unit to execute the action of acquiring the voltage signal again until the acquired voltage signal is consistent through the judgment circuit unit, and the control circuit unit stops acting;
c. the execution circuit unit controls the electric control loop unit to be conducted to complete the conversion of the power frequency and the frequency conversion; the execution circuit unit controls the switching switch SA to be closed, the frequency converter is started through a control starting button SB1, the AC contactor KM1 normally open contact is contacted and sucked, the frequency converter runs, in order to ensure the accuracy and high efficiency of phase detection, the target frequency is higher than the commercial power, the frequency converter runs to the target frequency of 50.10hz, the PA and PC contacts of the frequency converter extension relay are closed, after the phase detection circuit unit detects that the phases are consistent, the PA and PC contacts of the phase detection relay are closed, meanwhile, the normally open contact of the intermediate relay KA is sucked, the AC contactor KM1 normally open contact is disconnected, the time relay KT is controlled to be powered on, the normally open contact of the time relay KT is closed after a period of time delay, the normally open contact of the AC contactor KM2 is powered on and sucked, and the conversion from the frequency conversion operation to the power frequency is completed;
d. the electric control loop unit controls the motor to complete phase locking of output waveforms, and controls the switching circuit unit to complete switching of the motor from power frequency to frequency conversion; alternating current contactor KM1 is frequency conversion operation main loop contactor, and alternating current contactor KM2 is power frequency operation main loop contactor, and two contactors can not be closed simultaneously, and alternating current contactor KM2 can actuation after guaranteeing alternating current contactor KM1 disconnection certain time.
The invention effectively improves the success rate of switching and can quickly and accurately capture the phase synchronization. When the phase synchronization of the frequency converter and the power grid is checked, the switching is carried out immediately, current impact caused by switching under the condition of uncertain phases can be effectively prevented, a power switch and a contactor are prevented from being damaged, arc discharge and the like, the system is simple and efficient, and the switching stability and the success rate can be increased after the system is simple. The system effectively reduces the cost and can be produced and processed in batch.
Drawings
FIG. 1: the invention discloses a patent structure block diagram;
FIG. 2: the invention relates to a structural block diagram of a signal acquisition unit;
FIG. 3: the invention relates to a structure block diagram of a circuit unit for judging patent;
FIG. 4: the invention discloses a circuit diagram of an electric control loop unit.
FIG. 5: the invention discloses a circuit diagram of a main loop switching circuit unit.
Detailed Description
A high-power electric power industry frequency conversion switching system comprises:
the acquisition circuit unit (1) is used for acquiring the voltages of two-phase electricity of a power grid and two-phase electricity output by the frequency converter in the same phase;
the judging circuit unit (2) is used for comparing the collected voltage and the collected phase signal;
the control circuit unit (3) is used for controlling the acquisition circuit unit (1) and the judgment circuit unit (2) to move back and forth until corresponding control requirements are met;
an execution circuit unit (4) which is mainly used for executing the conduction work of the electric control loop unit (5);
the electric control loop unit (5) controls the motor (6) to complete phase locking of output waveforms, and controls the main loop switching circuit unit to complete conversion work of power frequency conversion;
the acquisition circuit unit (1) is connected with the judgment circuit unit (2), and the judgment circuit unit (2) is connected with the control circuit unit (3) and the execution circuit unit (4); the execution circuit unit (4) is connected with the electric control loop unit (5); the electric control loop unit (5) is connected with the motor (6).
The acquisition circuit unit (1) comprises an acquisition signal module (101), a rectification module (102), a power signal processing module (103) and a comparison signal processing module (104); the signal acquisition module (101) is connected with the rectification module (102), and the rectification module (102) is divided into a first rectification bridge (105) and a second rectification bridge (106); the rectifier bridge I (105) is connected with the power supply signal processing module (103), and the rectifier bridge II (106) is connected with the comparison signal processing module (104); the signal acquisition module (101) is respectively connected with a transformer T1(107) and a transformer T2 (108); the transformer T1(107) is connected with the first rectifier bridge (105), and the first rectifier bridge (105) is connected with the power signal processing module (103) and processed into a power signal; the transformer T2(108) is connected with the second rectifier bridge (106), and the second rectifier bridge (106) is connected with the comparison signal processing module (104) and processed into a comparison signal; the power supply signal processing module (103) is connected with the circuit board (109) and provides power supply for the circuit board (109); the comparison signal processing module (104) is an lm324 comparator.
The judging circuit unit (2) comprises an amplifying circuit module (201) and a phase detection circuit module (202); the amplifying circuit module (201) is connected with the phase detection circuit module (202); the judging circuit unit (2) controls the conduction of the first switch (203) and the second switch (204) through the output pin, so that the switch control circuit unit (3) acts, and the action points of the first switch (203) and the second switch (204) are adjusted through a potentiometer R6(205) R6; when the phase detection circuit module (202) detects that the phases are consistent, the switch III (206) is used for controlling the pull-in turn-off of the relay K1(207) to finish the detection control of the phases; when the phase detection circuit module (202) detects that the phases are inconsistent, the control circuit unit (3) controls the acquisition circuit unit (1) and the judgment circuit unit (2) to perform acquisition and judgment again until the phases are consistent.
The electric control loop unit (5) comprises a frequency converter extension relay (501), a phase detection relay (502), an alternating current contactor KM1(503), a time relay KT (504), an intermediate relay KA (505), an alternating current contactor KM2(506) and a starting button SB1 (507); the frequency converter extension relay (501) and the phase detection relay (502) are connected in series; the phase detection relay (502) is connected with a normally closed contact I (509) of an alternating current contactor KM2 and a normally open contact (510) of an intermediate relay KA in series; the starting button SB1(507) is connected in series with the starting button SB2(508), the intermediate relay KA normally closed contact (511), the alternating current contactor KM2 normally closed contact II (512) and the alternating current contactor KM1 normally open contact (513); the time relay KT is characterized in that a normally open contact (514) is connected in series with a starting button SB3(515), an alternating current contactor KM1 normally closed contact (516) and an alternating current contactor KM2 normally open contact (517).
A frequency conversion switching control method for high-power electric machinery comprises the following steps:
a. the acquisition signal module (101) acquires two-phase electricity of a power grid and voltage of the two-phase electricity output by the frequency converter in phase, one part of the voltage is converted into voltage in a controllable range through the transformer TI, and the voltage is rectified through a rectifier bridge I (105) formed by connecting D1, D2, D3 and D4 rectifiers in parallel and then processed into a power signal through the power signal processing module (103); one part of the voltage is converted into voltage in a controllable range through a transformer T2(108), and is rectified through a rectifier bridge II (106) formed by connecting a D5 rectifier, a D6 rectifier, a D7 rectifier and a D8 rectifier in parallel, and then is processed into a comparison signal through a comparison signal processing module (104);
b. the judgment circuit unit (2) amplifies the collected comparison signal by an operational amplifier U1 and then compares the amplified comparison signal with the set parameters of the system, and when the comparison signal is consistent with the set parameters, the judgment circuit unit (2) transmits the judgment signal to the execution circuit unit (4); when the comparison signal is inconsistent with the set parameter, the judgment circuit unit (2) transmits the judgment signal to the control circuit unit (3); the control circuit unit (3) controls the acquisition circuit unit (1) to execute the action of acquiring the voltage signal again until the acquired voltage signal is compared and consistent by the judgment circuit unit (2), and the control circuit unit (3) stops acting;
c. the execution circuit unit (4) controls the electric control loop unit (5) to be conducted to complete the conversion of power frequency and frequency conversion; the execution circuit unit (4) controls the switch SA (7) to be closed, meanwhile, the frequency converter is started by controlling a starting button SB1(507), the normally open contact (513) of the alternating current contactor KM1 is contacted and attracted, the frequency converter is operated, in order to ensure the accuracy and high efficiency of phase detection, the target frequency is higher than the commercial power, after the frequency converter is operated to the target frequency of 50.10hz, the PA contact and the PC contact of the frequency converter extension relay (501) are closed, after the phase detection circuit unit detects that the phases are consistent, the PA contact and the PC contact of the phase detection relay (502) are closed, meanwhile, a normally open contact (510) of the intermediate relay KA is attracted, a normally open contact (513) of the alternating current contactor KM1 is disconnected, the time relay KT (504) is controlled to be electrified, the normally open contact (514) of the time relay KT is closed after a period of time delay, and the normally open contact (517) of the alternating current contactor KM2 is electrified and attracted, so that the conversion from variable frequency operation to power frequency is completed;
d. the electric control loop unit (5) controls the motor (6) to complete phase locking of output waveforms, and controls the switching circuit unit to complete switching of the motor (6) from power frequency to frequency conversion; alternating current contactor KM1(503) is frequency conversion operation main loop contactor, and alternating current contactor KM2(506) is power frequency operation main loop contactor, and two contactors realize interlocking, can not be closed simultaneously, and the actuation of alternating current contactor KM2(506) can only be guaranteed after alternating current contactor KM1(503) breaks for a certain time.
The invention effectively improves the success rate of switching and can quickly and accurately capture the phase synchronization. When the phase synchronization of the frequency converter and the power grid is checked, the switching is carried out immediately, current impact caused by switching under the condition of uncertain phases can be effectively prevented, a power switch and a contactor are prevented from being damaged, arc discharge and the like, the system is simple and efficient, and the switching stability and the success rate can be increased after the system is simple. The system effectively reduces the cost and can be produced and processed in batch.
Claims (4)
1. A high-power electric machinery frequency conversion switched systems, characterized by: the method comprises the following steps:
the acquisition circuit unit (1) is used for acquiring the voltages of two-phase electricity of a power grid and two-phase electricity output by the frequency converter in the same phase;
the judging circuit unit (2) is used for comparing the collected voltage and the collected phase signal;
the control circuit unit (3) is used for controlling the acquisition circuit unit (1) and the judgment circuit unit (2) to move back and forth until corresponding control requirements are met;
an execution circuit unit (4) which is mainly used for executing the conduction work of the electric control loop unit (5);
the electric control loop unit (5) controls the motor (6) to complete phase locking of output waveforms, and controls the main loop switching circuit unit to complete conversion work of power frequency conversion;
the acquisition circuit unit (1) is connected with the judgment circuit unit (2), and the judgment circuit unit (2) is connected with the control circuit unit (3) and the execution circuit unit (4); the execution circuit unit (4) is connected with the electric control loop unit (5); the electric control loop unit (5) is connected with the motor (6);
the judging circuit unit (2) comprises an amplifying circuit module (201) and a phase detection circuit module (202); the amplifying circuit module (201) is connected with the phase detection circuit module (202); the phase detection circuit module (202) is also connected with a relay K1(207) through a switch III (206), and the relay K1(207) is also connected with the execution circuit unit (4); the judging circuit unit (2) further comprises a first switch (203) and a second switch (204) which are connected in parallel, one end of the first switch (203) and one end of the second switch (204) are connected with a potentiometer R6(205), and the other end of the first switch (203) and the other end of the second switch are connected with the control circuit unit (3); one end of the first switch (203), the second switch (204) and the potentiometer R6(205) is also connected with the phase detection circuit module (202); the judging circuit unit (2) controls the conduction of the first switch (203) and the second switch (204) through an output pin, then the switch control circuit unit (3) acts, and the action points of the first switch (203) and the second switch (204) are adjusted through a potentiometer R6 (205); when the phase detection circuit module (202) detects that the phases are consistent, the switch III (206) is used for controlling the pull-in turn-off of the relay K1(207) to finish the detection control of the phases; when the phase detection circuit module (202) detects that the phases are inconsistent, the control circuit unit (3) controls the acquisition circuit unit (1) and the judgment circuit unit (2) to perform acquisition and judgment again until the phases are consistent.
2. The high-power electric mechanical frequency conversion switching system according to claim 1, characterized in that: the acquisition circuit unit (1) comprises an acquisition signal module (101), a rectification module (102), a power signal processing module (103) and a comparison signal processing module (104); the signal acquisition module (101) is connected with the rectification module (102), and the rectification module (102) is divided into a first rectification bridge (105) and a second rectification bridge (106); the rectifier bridge I (105) is connected with the power supply signal processing module (103), and the rectifier bridge II (106) is connected with the comparison signal processing module (104); the signal acquisition module (101) is respectively connected with a transformer T1(107) and a transformer T2 (108); the transformer T1(107) is connected with the first rectifier bridge (105), and the first rectifier bridge (105) is connected with the power signal processing module (103) and processed into a power signal; the transformer T2(108) is connected with the second rectifier bridge (106), and the second rectifier bridge (106) is connected with the comparison signal processing module (104) and processed into a comparison signal; the power supply signal processing module (103) is connected with the circuit board (109) and provides power supply for the circuit board (109); the comparison signal processing module (104) is an lm324 comparator.
3. The high-power electric mechanical frequency conversion switching system according to claim 1, characterized in that: the electric control loop unit (5) comprises a frequency converter extension relay (501), a phase detection relay (502), an alternating current contactor KM1(503), a time relay KT (504), an intermediate relay KA (505), an alternating current contactor KM2(506) and a starting button SB1 (507); the frequency converter extension relay (501) and the phase detection relay (502) are connected in series; the frequency converter extension relay (501) and the phase detection relay (502) are also connected with a normally open contact (510) of an intermediate relay KA in parallel, and a normally closed contact I (509) of an alternating current contactor KM2 is connected behind the phase detection relay (502) in series; the starting button SB1(507) is connected in series with a starting button SB2(508), an intermediate relay KA normally closed contact (511) and an alternating current contactor KM2 normally closed contact II (512); the starting button SB1(507) is also connected in parallel with a normally open contact (513) of an alternating current contactor KM 1; the time relay KT normally-open contact (514) is connected with the starting button SB3(515) and the alternating current contactor KM1 normally-closed contact (516) in series; and the time relay KT normally open contact (514) is also connected with the alternating current contactor KM2 normally open contact (517) in parallel.
4. The control method of the high-power electric power frequency conversion switching system according to any one of claims 1 to 3, characterized in that: the method comprises the following steps:
a. the acquisition signal module (101) acquires two-phase electricity of a power grid and voltage of the two-phase electricity output by the frequency converter in phase, one part of the voltage is converted into voltage in a controllable range through the transformer TI, and the voltage is rectified through a rectifier bridge I (105) formed by connecting D1, D2, D3 and D4 rectifiers in parallel and then processed into a power signal through the power signal processing module (103); one part of the voltage is converted into voltage in a controllable range through a transformer T2(108), and is rectified through a rectifier bridge II (106) formed by connecting a D5 rectifier, a D6 rectifier, a D7 rectifier and a D8 rectifier in parallel, and then is processed into a comparison signal through a comparison signal processing module (104);
b. the judgment circuit unit (2) amplifies the collected comparison signal by an operational amplifier U1 and then compares the amplified comparison signal with the set parameters of the system, and when the comparison signal is consistent with the set parameters, the judgment circuit unit (2) transmits the judgment signal to the execution circuit unit (4); when the comparison signal is inconsistent with the set parameter, the judgment circuit unit (2) transmits the judgment signal to the control circuit unit (3); the control circuit unit (3) controls the acquisition circuit unit (1) to execute the action of acquiring the voltage signal again until the acquired voltage signal is compared and consistent by the judgment circuit unit (2), and the control circuit unit (3) stops acting;
c. the execution circuit unit (4) controls the electric control loop unit (5) to be conducted to complete the conversion of power frequency and frequency conversion; the execution circuit unit (4) controls the switch SA (7) to be closed, meanwhile, the frequency converter is started by controlling a starting button SB1(507), the normally open contact (513) of the alternating current contactor KM1 is contacted and attracted, the frequency converter is operated, in order to ensure the accuracy and high efficiency of phase detection, the target frequency is higher than the commercial power, after the frequency converter is operated to the target frequency of 50.10hz, the PA contact and the PC contact of the frequency converter extension relay (501) are closed, after the phase detection circuit unit detects that the phases are consistent, the PA contact and the PC contact of the phase detection relay (502) are closed, meanwhile, a normally open contact (510) of the intermediate relay KA is attracted, a normally open contact (513) of the alternating current contactor KM1 is disconnected, the time relay KT (504) is controlled to be electrified, the normally open contact (514) of the time relay KT is closed after a period of time delay, and the normally open contact (517) of the alternating current contactor KM2 is electrified and attracted, so that the conversion from variable frequency operation to power frequency is completed; wherein, the change-over switch SA (7) is connected with the frequency converter extension relay (501) in series; the frequency converter extension relay (501) is connected with the phase detection relay (502) in series; the frequency converter extension relay (501) and the phase detection relay (502) are also connected with the intermediate relay KA normally open contact (510) in parallel; the starting button SB1(507) is connected in parallel with the normally open contact (513) of the alternating current contactor KM 1; a time relay KT normally-open contact (514) is connected with an alternating current contactor KM2 normally-open contact (517) in parallel; the time relay KT (504), the alternating current contactor KM1(503) and the alternating current contactor KM2(506) are connected in parallel at the same time;
d. the electric control loop unit (5) controls the motor (6) to complete phase locking of output waveforms, and controls the switching circuit unit to complete switching of the motor (6) from power frequency to frequency conversion; alternating current contactor KM1(503) is frequency conversion operation main loop contactor, and alternating current contactor KM2(506) is power frequency operation main loop contactor, and two contactors realize interlocking, can not be closed simultaneously, and the actuation of alternating current contactor KM2(506) can only be guaranteed after alternating current contactor KM1(503) breaks for a certain time.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811100426.9A CN109150061B (en) | 2018-09-20 | 2018-09-20 | High-power electric power frequency conversion switching system and control method thereof |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811100426.9A CN109150061B (en) | 2018-09-20 | 2018-09-20 | High-power electric power frequency conversion switching system and control method thereof |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN109150061A CN109150061A (en) | 2019-01-04 |
| CN109150061B true CN109150061B (en) | 2022-02-08 |
Family
ID=64815352
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201811100426.9A Active CN109150061B (en) | 2018-09-20 | 2018-09-20 | High-power electric power frequency conversion switching system and control method thereof |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN109150061B (en) |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110277949B (en) * | 2019-07-25 | 2021-08-13 | 中冶赛迪电气技术有限公司 | Control system and control method for synchronous switching of high-voltage frequency converter |
| CN110953154A (en) * | 2019-10-31 | 2020-04-03 | 上海斯可络压缩机有限公司 | Screw compressor work frequency conversion online switching system |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102377385A (en) * | 2010-08-26 | 2012-03-14 | 日立电梯（中国）有限公司 | Bypass variable-frequency controller with phase detection |
| EP2571160A1 (en) * | 2011-09-16 | 2013-03-20 | Siemens Aktiengesellschaft | Drive system for high voltage AC motor |
| CN103856067A (en) * | 2014-03-31 | 2014-06-11 | 深圳市英威腾电气股份有限公司 | Frequency converter and synchronous working frequency conversion switching control system and method |
| CN104158228A (en) * | 2014-09-03 | 2014-11-19 | 哈尔滨工业大学 | Non-damping winding permanent-magnet synchronous motor grid connection method |
| CN105337540A (en) * | 2015-11-25 | 2016-02-17 | 北京金自天正智能控制股份有限公司 | Two-level circuit board for achieving permanent magnet synchronous motor frequency conversion soft start and grid-connected control |
-
2018
- 2018-09-20 CN CN201811100426.9A patent/CN109150061B/en active Active
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102377385A (en) * | 2010-08-26 | 2012-03-14 | 日立电梯（中国）有限公司 | Bypass variable-frequency controller with phase detection |
| EP2571160A1 (en) * | 2011-09-16 | 2013-03-20 | Siemens Aktiengesellschaft | Drive system for high voltage AC motor |
| CN103856067A (en) * | 2014-03-31 | 2014-06-11 | 深圳市英威腾电气股份有限公司 | Frequency converter and synchronous working frequency conversion switching control system and method |
| CN104158228A (en) * | 2014-09-03 | 2014-11-19 | 哈尔滨工业大学 | Non-damping winding permanent-magnet synchronous motor grid connection method |
| CN105337540A (en) * | 2015-11-25 | 2016-02-17 | 北京金自天正智能控制股份有限公司 | Two-level circuit board for achieving permanent magnet synchronous motor frequency conversion soft start and grid-connected control |
Also Published As
| Publication number | Publication date |
|---|---|
| CN109150061A (en) | 2019-01-04 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN109150061B (en) | High-power electric power frequency conversion switching system and control method thereof | |
| CN104868586A (en) | Automatic switching power supply circuit for double-way power supply | |
| CN106253461B (en) | The control method of Novel static switch | |
| CN101562353B (en) | On-line mutual switching control device of fundamental frequency power supply and variable frequency power supply | |
| CN107069935A (en) | The power switching device controlled based on PLC | |
| CN102377385A (en) | Bypass variable-frequency controller with phase detection | |
| CN201690400U (en) | Frequency-conversion soft-start hybrid power cabinet | |
| CN204669243U (en) | The soft voltage-stabilizing power supply of electrostatic precipitator high-frequency and high-voltage | |
| CN209311901U (en) | A kind of loading system pulling winch frequency-changing control system | |
| CN102185557A (en) | Speed regulation control system of single-phase induction motor | |
| CN207218579U (en) | Motor star-delta mode of connection control device | |
| CN105720885B (en) | A method of realizing high-voltage frequency converter low voltage crossing | |
| CN201898321U (en) | Cooling control circuit of variable frequency motor | |
| CN201435618Y (en) | An online switch control unit between power frequency supply and variable frequency power supply | |
| CN107204723A (en) | The unordered loop start method of synchronous motor based on high voltage converter | |
| CN201947218U (en) | Single-phase induction motor speed regulation control system | |
| CN102968068A (en) | Control circuit capable of achieving energy-saving working state | |
| CN103248288B (en) | Brshless DC motor adaptive driver | |
| CN203166769U (en) | High voltage frequency converter having rotating speed tracking and starting function | |
| Lu et al. | Research and design of a multifunctional soft starter | |
| CN201893550U (en) | Anti-islanding protection system for photovoltaic inverter | |
| CN206077272U (en) | Lifting platform control chamber | |
| CN205594334U (en) | Control circuit is switched over in no disturbance | |
| CN202816801U (en) | AC vacuum contactor control system | |
| CN201616793U (en) | Energy saving control system of pumping unit motor |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant |