CN110943673A - Control system and control method for frequency conversion and power frequency switching of high-voltage frequency converter - Google Patents
Control system and control method for frequency conversion and power frequency switching of high-voltage frequency converter Download PDFInfo
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- CN110943673A CN110943673A CN201911215349.6A CN201911215349A CN110943673A CN 110943673 A CN110943673 A CN 110943673A CN 201911215349 A CN201911215349 A CN 201911215349A CN 110943673 A CN110943673 A CN 110943673A
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- frequency
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- power frequency
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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
- H02P27/00—Arrangements or methods for the control of AC motors characterised by the kind of supply voltage
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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
- 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
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- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Inverter Devices (AREA)
- Control Of Ac Motors In General (AREA)
Abstract
A control system and a control method for switching power frequency by high-voltage frequency converter frequency conversion comprise the high-voltage frequency converter, an input contactor KM1, a frequency conversion contactor KM3, a power frequency contactor KM4 and a power frequency sampling module, and are characterized in that the high-voltage frequency converter is connected with a power grid through the input contactor KM1, is connected with a motor through the frequency conversion contactor KM3, is connected with the power grid through a power frequency contactor KM4, and collects amplitude, frequency and phase of power frequency grid voltage and current of the power frequency contactor KM4 through the power frequency sampling module; under the condition that an output reactor of the high-voltage frequency converter is not increased, the uninterrupted control process of switching the variable-frequency power supply of the motor is realized; the problem of the impulse current to the motor under the frequency conversion changes power frequency off-line switching mode is solved, the problem that the reactor needs to be increased under the frequency conversion changes power frequency on-line switching mode is solved.
Description
Technical Field
The invention relates to the technical field of frequency conversion switching power frequency of a high-voltage frequency converter, in particular to a control system and a control method for frequency conversion switching power frequency of the high-voltage frequency converter.
Background
At present, there are two kinds of implementation ways for the high-voltage inverter in the process of switching power frequency in frequency conversion, as shown in fig. 2: one is that the frequency converter contactor KM3 is disconnected firstly, and then the power frequency contactor KM4 is closed; the other is that a reactor is added at the output of the frequency converter, when the frequency conversion is converted into the power frequency, the power frequency contactor KM4 is firstly attracted, and the frequency conversion contactor KM3 is disconnected; the first mode control mode is called an off-line switching mode, and in the switching process, the power supply at the motor end is discontinuous, so that the rotating speed of the motor can be reduced, the amplitude and the frequency of the voltage at the motor end can be reduced, and the voltage of a power frequency power grid is inconsistent with the voltage at the motor end when a power frequency contactor is pulled in, and a large impact current is generated; the second control mode is called an online switching mode, and the reactor is added through the output of the frequency converter to inhibit the circulation current generated due to the difference between the power grid voltage and the frequency converter voltage after the power frequency contactor KM4 is attracted.
Disclosure of Invention
In order to solve the problems, the invention provides a control system and a control method for switching the frequency conversion of a high-voltage frequency converter to power frequency, and provides a control system and a control method for realizing the uninterrupted operation of a motor power supply in the process of switching the frequency conversion to power frequency without using a reactor. In order to achieve the purpose, the invention adopts the technical scheme that: the utility model provides a control system of power frequency is switched in high-voltage inverter frequency conversion, includes high-voltage inverter, input contactor KM1, frequency conversion contactor KM3, power frequency contactor KM4 and power frequency sampling module, high-voltage inverter is connected with the electric wire netting through input contactor KM1, and high-voltage inverter is connected with the motor through frequency conversion contactor KM3, and the motor is connected with the electric wire netting through power frequency contactor KM4, and high-voltage inverter passes through power frequency sampling module and gathers power frequency electric wire netting voltage's amplitude, frequency, phase place and power frequency contactor KM 4's electric current.
Further, the power frequency sampling module comprises a three-phase voltage sampling circuit and a three-phase current sampling circuit.
A control method for switching power frequency of a high-voltage frequency converter in a frequency conversion manner comprises the following steps:
(1) the high-voltage frequency converter collects amplitude, frequency and phase signals of the voltage of the power grid and current magnitude signals of a power frequency contactor KM4 through a power frequency sampling module;
(2) adjusting the output voltage of the high-voltage frequency converter to be consistent with the voltage of the power grid;
(3) attracting a power frequency contactor KM 4;
(4) judging the current of the power frequency contactor KM4, and if the current of the power frequency contactor KM4 is larger than a preset value, blocking the output of a high-voltage frequency converter;
(5) and opening the variable frequency contactor KM 3.
Compared with the prior art, the invention has the following beneficial effects: under the condition that an output reactor of the high-voltage frequency converter is not increased, the uninterrupted control process of switching the variable-frequency power supply of the motor is realized; the problem of the impulse current to the motor under the frequency conversion changes power frequency off-line switching mode is solved, the problem that the reactor needs to be increased under the frequency conversion changes power frequency on-line switching mode is solved.
Drawings
The present invention is described in further detail below with reference to the attached drawings.
FIG. 1 is a schematic structural view of the present invention;
FIG. 2 is a schematic diagram of a main loop topology of a high voltage inverter;
fig. 3 is a schematic structural diagram of a power frequency sampling module.
Detailed Description
In order to make the technical solutions of the present invention better understood by those skilled in the art, the present invention will be further described with reference to fig. 1, fig. 3 and the following specific embodiments.
As shown in the attached drawing 1, a control system of power frequency is switched in high-voltage inverter frequency conversion, including high-voltage inverter, input contactor KM1, frequency conversion contactor KM3, power frequency contactor KM4 and power frequency sampling module, high-voltage inverter is connected with the electric wire netting through input contactor KM1, and high-voltage inverter is connected with the motor through frequency conversion contactor KM3, and the motor is connected with the electric wire netting through power frequency contactor KM4, and high-voltage inverter gathers power frequency electric wire netting voltage's amplitude, frequency, phase place and power frequency contactor KM 4's electric current through power frequency sampling module.
Further, the power frequency sampling module comprises a three-phase voltage sampling circuit and a three-phase current sampling circuit.
The high-voltage frequency converter can control the joint of the input contactor KM1, the variable-frequency contactor KM3 and the power frequency contactor KM4 so as to realize the switching of variable-frequency switching power frequency.
A control method for switching power frequency of a high-voltage frequency converter in a frequency conversion manner comprises the following steps:
(1) the high-voltage frequency converter collects amplitude, frequency and phase signals of the voltage of the power grid and current magnitude signals of a power frequency contactor KM4 through a power frequency sampling module;
(2) adjusting the output voltage of the high-voltage frequency converter to be consistent with the voltage of the power grid;
(3) attracting a power frequency contactor KM 4;
(4) judging the current of the power frequency contactor KM4, and if the current of the power frequency contactor KM4 is larger than a preset value, blocking the output of a high-voltage frequency converter;
(5) and opening the variable frequency contactor KM 3.
The working principle and the working process of the invention are as follows: as shown in fig. 3, the power frequency sampling module includes a voltage sampling circuit and a current sampling circuit: the voltage sampling circuit signal is decomposed into amplitude, frequency and phase signals of the power grid voltage through a single chip microcomputer signal, and the amplitude, frequency and phase signals are sent to a master control system of the high-voltage frequency converter through the optical fiber communication circuit 1 and used for the master control system to adjust the amplitude, frequency and phase of the output voltage of the high-voltage frequency converter to be consistent with the power grid; the current sampling circuit signal is rectified and filtered into a direct current signal, the direct current signal is compared with triangular waves in the circuit to produce a PWM signal, and the PWM signal is sent to a main control system of the high-voltage frequency converter through the optical fiber communication circuit 2, so that the main control system of the high-voltage frequency converter judges the magnitude of current according to the pulse width of the PWM signal; the difference between the optical fiber communication circuit 1 and the optical fiber communication circuit 2 is that the optical fiber communication circuit 1 is in serial communication and periodically sends data; the optical fiber communication circuit 2 converts the PWM signal into an optical signal and transmits the optical signal in real time so as to ensure that a master control system of the high-voltage frequency converter can respond to current change in time.
When the high-voltage frequency converter receives the converted power frequency signal, the master control system of the high-voltage frequency converter adjusts the output voltage of the high-voltage frequency converter to be consistent with the power frequency power grid voltage uploaded by the power frequency sampling module; then attracting a power frequency contactor KM4, and simultaneously judging the current of a power frequency contactor KM 4; when the current on the power frequency contactor KM4 is detected to be larger than a preset value, the main control system judges that KM4 is attracted, and then the output and the shutdown of the high-voltage frequency converter are blocked; the circulation between the high-voltage frequency converter and the power grid is prevented; and after the high-voltage frequency converter is shut down, the variable-frequency contactor KM3 is disconnected, and the process of switching the variable frequency to the power frequency is completed.
Compared with the prior art, the invention has the following beneficial effects: under the condition that an output reactor of the high-voltage frequency converter is not increased, the uninterrupted control process of switching the variable-frequency power supply of the motor is realized; the problem of the impulse current to the motor under the frequency conversion changes power frequency off-line switching mode is solved, the problem that the reactor needs to be increased under the frequency conversion changes power frequency on-line switching mode is solved.
The technical solutions of the present invention or similar technical solutions designed by those skilled in the art based on the teachings of the technical solutions of the present invention are all within the scope of the present invention.
Claims (3)
1. The utility model provides a control system of power frequency is switched in high-voltage inverter frequency conversion, includes high-voltage inverter, input contactor KM1, frequency conversion contactor KM3, power frequency contactor KM4 and power frequency sampling module, characterized by the high-voltage inverter is connected with the electric wire netting through input contactor KM1, and the high-voltage inverter is connected with the motor through frequency conversion contactor KM3, and the motor is connected with the electric wire netting through power frequency contactor KM4, and the high-voltage inverter passes through power frequency sampling module and gathers power frequency electric wire netting voltage's amplitude, frequency, phase place and power frequency contactor KM 4's electric current.
2. The control system for switching power frequency in a variable frequency manner of the high-voltage inverter according to claim 1, wherein the power frequency sampling module comprises a three-phase voltage sampling circuit and a three-phase current sampling circuit.
3. The control method of the control system for switching the frequency conversion of the high-voltage inverter to the power frequency according to claim 1 is characterized by comprising the following steps:
(1) the high-voltage frequency converter collects amplitude, frequency and phase signals of the voltage of the power grid and current magnitude signals of a power frequency contactor KM4 through a power frequency sampling module;
(2) adjusting the output voltage of the high-voltage frequency converter to be consistent with the voltage of the power grid;
(3) attracting a power frequency contactor KM 4;
(4) judging the current of the power frequency contactor KM4, and if the current of the power frequency contactor KM4 is larger than a preset value, blocking the output of a high-voltage frequency converter;
(5) and opening the variable frequency contactor KM 3.
Priority Applications (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201911215349.6A CN110943673A (en) | 2019-12-02 | 2019-12-02 | Control system and control method for frequency conversion and power frequency switching of high-voltage frequency converter |
| PCT/CN2020/098317 WO2021109555A1 (en) | 2019-12-02 | 2020-06-26 | Control system for switching from variable frequency to power frequency by high-voltage variable frequency drive, and control method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201911215349.6A CN110943673A (en) | 2019-12-02 | 2019-12-02 | Control system and control method for frequency conversion and power frequency switching of high-voltage frequency converter |
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| CN110943673A true CN110943673A (en) | 2020-03-31 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201911215349.6A Pending CN110943673A (en) | 2019-12-02 | 2019-12-02 | Control system and control method for frequency conversion and power frequency switching of high-voltage frequency converter |
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| CN (1) | CN110943673A (en) |
| WO (1) | WO2021109555A1 (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2021109555A1 (en) * | 2019-12-02 | 2021-06-10 | 新风光电子科技股份有限公司 | Control system for switching from variable frequency to power frequency by high-voltage variable frequency drive, and control method |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5980183A (en) * | 1982-10-29 | 1984-05-09 | M Syst Giken:Kk | Control system for induction motor |
| CN105471085A (en) * | 2015-12-23 | 2016-04-06 | 北京动力源科技股份有限公司 | Power frequency-variable frequency switching control method and apparatus and high voltage inverter |
| CN105871291A (en) * | 2016-04-11 | 2016-08-17 | 西南交通大学 | Bumpless transfer method used for frequency converter and common frequency power network |
| CN109510471A (en) * | 2017-09-15 | 2019-03-22 | 奥的斯电梯公司 | Frequency converter, bypass frequency conversion control system and its method for handover control |
Family Cites Families (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN201594749U (en) * | 2010-01-18 | 2010-09-29 | 东方日立(成都)电控设备有限公司 | Alternating current motor synchronization grid-connected switching device |
| CN103863932B (en) * | 2012-12-17 | 2017-09-05 | 通力股份公司 | Frequency converter and the staircase control device with frequency converter |
| CN106533319B (en) * | 2016-10-29 | 2019-03-29 | 上海新时达电气股份有限公司 | Frequency conversion and power frequency without trace switching method |
| CN108266398B (en) * | 2017-01-03 | 2019-08-16 | 新疆知信科技有限公司 | Stable operation method when primary air fan frequency conversion cutting frequency |
| CN110943673A (en) * | 2019-12-02 | 2020-03-31 | 新风光电子科技股份有限公司 | Control system and control method for frequency conversion and power frequency switching of high-voltage frequency converter |
-
2019
- 2019-12-02 CN CN201911215349.6A patent/CN110943673A/en active Pending
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2020
- 2020-06-26 WO PCT/CN2020/098317 patent/WO2021109555A1/en active Application Filing
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5980183A (en) * | 1982-10-29 | 1984-05-09 | M Syst Giken:Kk | Control system for induction motor |
| CN105471085A (en) * | 2015-12-23 | 2016-04-06 | 北京动力源科技股份有限公司 | Power frequency-variable frequency switching control method and apparatus and high voltage inverter |
| CN105871291A (en) * | 2016-04-11 | 2016-08-17 | 西南交通大学 | Bumpless transfer method used for frequency converter and common frequency power network |
| CN109510471A (en) * | 2017-09-15 | 2019-03-22 | 奥的斯电梯公司 | Frequency converter, bypass frequency conversion control system and its method for handover control |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2021109555A1 (en) * | 2019-12-02 | 2021-06-10 | 新风光电子科技股份有限公司 | Control system for switching from variable frequency to power frequency by high-voltage variable frequency drive, and control method |
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| WO2021109555A1 (en) | 2021-06-10 |
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Application publication date: 20200331 |