CN104935213B - The grid-connected system and method for realizing soft starter for motor of high voltage converter - Google Patents
The grid-connected system and method for realizing soft starter for motor of high voltage converter Download PDFInfo
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- CN104935213B CN104935213B CN201410101868.0A CN201410101868A CN104935213B CN 104935213 B CN104935213 B CN 104935213B CN 201410101868 A CN201410101868 A CN 201410101868A CN 104935213 B CN104935213 B CN 104935213B
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Abstract
The present invention relates to soft starter for motor technical field, more particularly to a kind of grid-connected system and method for realizing soft starter for motor of high voltage converter.The system includes switch KM1；High voltage converter, its end of incoming cables are connected by the switch KM1 with power network, the input connection of leading-out terminal and motor；KM2 is switched, it is connected between the input of the power network and the motor；Voltage sample module, it is connected between the signal input part of the power network and the high voltage converter, for being sampled to line voltage；The high voltage converter is used to detect the line voltage in real time, the motor is driven to be stepped up to power frequency from 0Hz when switch KM1 closures, switch KM2 disconnect, and after the motor rises to power frequency, the voltage consistent with the phase, frequency and amplitude of the line voltage is exported to the motor, then the switch KM2 is closed, and after motor stabilizing operation sets an one number time, disconnect the switch KM1.
Description
Technical field
The present invention relates to soft starter for motor technical field, more particularly to a kind of high voltage converter is grid-connected realizes soft starter for motor
System and method.
Background technology
Have extensive purposes, particularly high voltage converter in industrial circle frequency converter, AC Motor Control, speed governing and
There is important application in terms of soft start.
In some special motor drag application scenarios, demand motor operation is not under conversion system, but needs electricity
Machine can be smooth raising speed to power frequency, can typically use following equipment to realize：
1. motor soft starter
Motor soft starter, as pressure regulator, is accessed power supply and motor stator typically using three-phase anti-parallel thyristor
Between son, during soft start motor, the output voltage of IGCT gradually increases, and motor ramps up, until IGCT is fully on,
Motor is operated in the mechanical property of rated voltage, and then IGCT is bypassed by auto by pass contactor, now nets end power supply, real
It is now smooth to start.
Such a method reduces starting current, operationally bypasses IGCT and reduces thermal losses, and cost is relative
It is relatively low.But detent torque deficiency, it is impossible to which band heavy load starting, starting in face of load torque fluctuation can be unstable, and start up curve
It can not be defined with user.
2. high voltage converter soft start function
Existing high voltage converter soft Starting Technology mainly has following several：
1. synchronous synchronizing mode.Frequency converter dragging motor accelerates to power frequency, when frequency converter output is consistent with grid phase,
Frequency converter disengages motor at once, then closes power frequency switch, and motor changes is powered by power network.Such a method extra cost expense is small, but
To load request height.Big in load torque, rotating speed falls soon, and phase difference caused by handoff delay will impact to power network,
Power frequency switch trip is caused, while brings the fluctuation of the torque of motor.
2. plesiochronous combination method.Frequency converter is dragged to close to power frequency, and then quasi- simultaneous interconnecting device, which starts to lock, mutually locks pressure,
And regulating command is sent to frequency converter, make frequency converter output and power network with frequency, same to phase, same to pressure.When quasi- simultaneous interconnecting device inspection
When exporting to frequency converter with power network output phase error in tolerance interval, while the disconnected frequency converter output of power frequency switch is closed, it is complete
Into the switching for being converted to power frequency.Although such a method is good to workload-adaptability, output control precision is low, error is big, in addition by
Removed in frequency converter outputting cutting and power network is cut and asynchronous therefore grid-connected impact is inevitable.
The content of the invention
The technical problems to be solved by the invention are to propose a kind of grid-connected system for realizing soft starter for motor of high voltage converter
And method, realize to motor without impact soft start, and lift the adaptability to motor torque.What the present invention was realized in：
A kind of grid-connected system for realizing soft starter for motor of high voltage converter, including：
Switch KM1；
High voltage converter, its end of incoming cables are connected by the switch KM1 with power network, and the input of leading-out terminal and motor connects
Connect；
KM2 is switched, it is connected between the input of the power network and the motor；
Voltage sample module, it is connected between the signal input part of the power network and the high voltage converter, for pair
Line voltage is sampled；
The high voltage converter is used to detect the line voltage in real time, is disconnected in switch KM1 closures, switch KM2
When drive the motor to be stepped up to power frequency from 0Hz, and after the motor rises to power frequency, output and the line voltage
Phase, frequency and the consistent voltage of amplitude to the motor, then close the switch KM2, and transport in the motor stabilizing
After row sets an one number time, the switch KM1 is disconnected.
Further, the leading-out terminal of the high voltage converter is connected by switching KM3 with the input of the motor.
Further, it is also associated with reactor between the leading-out terminal of the high voltage converter and the switch KM3.
Further, be also associated with charging resistor between the high voltage converter and the switch KM1, the charging resistor with
It is in parallel to switch KM4.
Further, the high voltage converter includes：Clarke converters, Park converters, the PI being sequentially connected with are controlled
Device, integrator, triangular-wave generator；The triangular-wave generator is also connected with the Park converters；
The Clarke converters are used to carry out Clarke conversion to the grid voltage waveform；
The Park converters are used to carry out Park conversion to the voltage waveform by Clark conversion；
The PI controllers are used to carry out ratio and integral adjustment to the voltage waveform by Park conversion；
The integrator is used to carry out integral operation to the voltage waveform by ratio and integral adjustment；
The triangular-wave generator is used to be converted to the result of above-mentioned integral operation containing mains frequency and phase information
Triangular wave.
Further, the high voltage converter is additionally operable to detect the disturbance of itself bus in real time, and itself and the power network is electric
Pressure is compared, and is then modulated according to comparison result by SVPWM and carries out real-Time Compensation to the busbar voltage, until the height
The output voltage of voltage frequency changer is consistent with the amplitude of the line voltage.
A kind of grid-connected method for realizing soft starter for motor of high voltage converter, comprises the following steps：
Motor is stepped up to power frequency from 0Hz；
High voltage converter detects line voltage in real time, after motor rises to power frequency, high voltage converter output and power network electricity
The phase of pressure, frequency and the consistent voltage of amplitude to the motor, then with the common motor of power network；
After motor stabilizing operation setting individual one number time, only pass through power network motor.
Further, the phase and frequency of high voltage converter line voltage described in real-time tracking as follows：
Clarke conversion is carried out to the waveform of the line voltage by Charke converters；
Park conversion is carried out to the voltage waveform by Clark conversion by Park converters；
Ratio and integral adjustment are carried out to the voltage waveform by Park conversion by PI controllers；
Integral operation is carried out to the voltage waveform by ratio and integral adjustment by integrator；
The result Jing Guo above-mentioned integral operation is converted to containing mains frequency and phase information by triangular-wave generator
Triangular wave.
Further, the high voltage converter makes its output voltage keep one with the line voltage as follows
Cause：
The disturbance of itself bus is detected in real time, and it is compared with the line voltage；
Modulated according to comparison result by SVPWM and real-Time Compensation is carried out to the busbar voltage, until the high-pressure frequency-conversion
The output voltage of device is consistent with the amplitude of the line voltage.
Compared with prior art, after using the technology of the present invention, electric motor starting and be switched to common frequency power network process it is smooth,
Without impact, user can control frequency upgrading curve according to the actual conditions of motor on high voltage converter, improve to motor
Adaptability.
Brief description of the drawings
Fig. 1：The grid-connected system composition schematic diagram for realizing soft starter for motor of high voltage converter provided in an embodiment of the present invention；
Fig. 2：The composition schematic diagram of said system medium-high voltage frequency converter；
Fig. 3：The grid-connected method flow schematic diagram for realizing soft starter for motor of high voltage converter provided in an embodiment of the present invention.
Embodiment
In order to make the purpose , technical scheme and advantage of the present invention be clearer, it is right below in conjunction with drawings and Examples
The present invention is further elaborated.
Fig. 1 shows the grid-connected system composition signal for realizing soft starter for motor of high voltage converter provided in an embodiment of the present invention
Figure, according to Fig. 1, the system includes：
High voltage converter 3, its end of incoming cables are connected by switching KM1 with power network 1, and leading-out terminal is connected with the input of motor 4；
KM2 is switched, it is connected between the input of power network 1 and motor 4；
Voltage sample module 2, it is connected between the signal input part of power network 1 and high voltage converter 3, for power network electricity
Pressure is sampled；
Charging resistor R is also associated between high voltage converter 3 and KM1, charging resistor R both ends are parallel with switch KM4.It is high
The output end of voltage frequency changer 3 passes sequentially through reactor L, switch KM3 is connected with the input of motor 4.
High voltage converter 3 is used for the voltage for detecting power network 1 in real time, is disconnected in switch KM1 and switch KM3 closures, switch KM2
（Frequency conversion is closed a floodgate, power frequency separating brake）When motor 4 be stepped up to power frequency from 0Hz, and after motor 4 rises to power frequency, output
The voltage consistent with the phase, frequency and amplitude of the voltage of power network 1 is to motor 4, then closure switch KM2（Power frequency is closed a floodgate）, and
After motor stabilizing operation sets an one number time, switch KM1 and switch KM3 is disconnected（Frequency conversion separating brake）.
In foregoing circuit, charging resistor R is used to limit the electric current flowed into high voltage converter 3, and reactor L can reduce height
Harmonic wave caused by voltage frequency changer 3, and the influence of the surge current from power network and overvoltage to high voltage converter 3.
According to Fig. 2, high voltage converter 3 includes Clarke converters 301, Park converters 302, the PI being sequentially connected with
Controller 303, integrator 304, triangular-wave generator 305；Triangular-wave generator 305 is also connected with Park converters 302；
Clarke converters 301 are used to carry out Clarke conversion to the grid voltage waveform；
Park converters 302 are used to carry out Park conversion to the voltage waveform by Clark conversion；
PI controllers 303 are used to carry out ratio and integral adjustment to the voltage waveform by Park conversion；
Integrator 304 is used to carry out integral operation to the voltage waveform by ratio and integral adjustment；
Triangular-wave generator 305 is used to the voltage waveform Jing Guo integral operation being converted to triangular wave, and according to described three
Angle ripple determines the phase and frequency of the voltage of power network 1.
After the phase and frequency that determine the voltage of power network 1, high voltage converter 3 can be modulated by SVPWM makes output voltage
Phase and frequency keep phase and frequency with the voltage of power network 1 to be consistent.
High voltage converter 3 is additionally operable to detect the disturbance of itself bus in real time, and it is compared with the voltage of power network 1, so
Afterwards according to comparison result by SVPWM modulate to busbar voltage carry out real-Time Compensation, until high voltage converter 3 output voltage with
The amplitude of the voltage of power network 1 is consistent.
Based on said system, present invention also offers a kind of grid-connected method for realizing soft starter for motor of high voltage converter, root
According to shown in Fig. 3, this method includes following flow：
Disconnected first by switch KM1 and switch KM3 closures, by KM2（Frequency conversion is closed a floodgate, power frequency separating brake）, so, motor 4 by
Power network 1 is driven by high voltage converter 3.The motor 4 since 0Hz of high voltage converter 3 is stepped up to power frequency, avoids directly
The impact failure motor 4 as caused by driving power network.The motor 4 of high voltage converter 3 by the 0Hz power frequencies gradually risen speed
It can be set according to actual conditions such as the specifications of motor 4 by user on high voltage converter 3, be so suitable for polytype motor
4.Meanwhile high voltage converter 3 detects the voltage of power network 1 by voltage sample module 2 in real time, detects its phase, frequency and amplitude.
After motor 4 rises to power frequency, high voltage converter 3 exports the voltage consistent with the phase, frequency and amplitude of the voltage of power network 1 and arrived
Motor 4, then closure switch KM2（Power frequency is closed a floodgate）, at this moment, motor 4 is powered jointly by high voltage converter 3 and power network 1.Allow motor
The cycle of 4 operation setting numbers, it is ensured that after motor 4 is stable, then disconnect switch KM1 and switch KM3（Frequency conversion separating brake）, so as to
Individually motor 4 is powered by power network 1, completes the handoff procedure to power network 1 by high voltage converter 3.
The phase and frequency of the line voltage described in real-time tracking as follows of high voltage converter 3：
Clarke conversion is carried out to the waveform of the line voltage by Clarke converters 301；
Park conversion is carried out to the voltage waveform by Clark conversion by Park converters 302；
Ratio and integral adjustment are carried out to the voltage waveform by Park conversion by PI controllers 303；
Integral operation is carried out to the voltage waveform by ratio and integral adjustment by integrator 304；
Voltage waveform Jing Guo integral operation is converted to by triangular wave by triangular-wave generator 305, and according to described three
Angle ripple determines the phase and frequency of the line voltage.
Aforesaid way is generally that a kind of voltage signal by power network 1 carries out vector point used by high voltage converter 3
For solution into quadrature axis and direct-axis component, it is 0 to realize high-pressure frequency-conversion that the closed-loop control of passing ratio and integration, which makes direct-axis component constant,
The phase of device 3 and the phase of power network 1 are locked, and the phase and the phase of power network 1 for making high voltage converter 3 are consistent.Using
Closed-loop control, dynamic response is fast, and PGC demodulation is accurate and rapid, is not influenceed by mains by harmonics.
Meanwhile high voltage converter 3 also makes its output voltage be consistent with the line voltage as follows：
The disturbance of itself bus is detected in real time, and it is compared with the voltage of power network 1；
Modulated according to comparison result by SVPWM and real-Time Compensation is carried out to busbar voltage, until the output of high voltage converter 3
Voltage is consistent with the amplitude of the voltage of power network 1.
The foregoing is merely illustrative of the preferred embodiments of the present invention, is not intended to limit the invention, all essences in the present invention
All any modification, equivalent and improvement made within refreshing and principle etc., should be included in the scope of the protection.
Claims (7)
- A kind of 1. grid-connected system for realizing soft starter for motor of high voltage converter, it is characterised in that including：Switch KM1；High voltage converter, its end of incoming cables are connected by the switch KM1 with power network, the input connection of leading-out terminal and motor；KM2 is switched, it is connected between the input of the power network and the motor；Voltage sample module, it is connected between the signal input part of the power network and the high voltage converter, for power network Voltage is sampled；The high voltage converter is used to detect the line voltage in real time, is driven when switch KM1 closures, switch KM2 disconnect Move the motor and be stepped up to power frequency from 0Hz, and after the motor rises to power frequency, export the phase with the line voltage Position, frequency and the consistent voltage of amplitude arrive the motor, then close the switch KM2, and run and set in the motor stabilizing After fixed one number time, the switch KM1 is disconnected；Wherein, the high voltage converter is additionally operable to detect the disturbance of itself bus in real time, and itself and the line voltage are compared It is right, then modulated according to comparison result by SVPWM and real-Time Compensation is carried out to the busbar voltage, until the high voltage converter Output voltage it is consistent with the amplitude of the line voltage.
- 2. the grid-connected system for realizing soft starter for motor of high voltage converter as claimed in claim 1, it is characterised in that the high pressure The leading-out terminal of frequency converter is connected by switching KM3 with the input of the motor.
- 3. the grid-connected system for realizing soft starter for motor of high voltage converter as claimed in claim 2, it is characterised in that the high pressure Reactor is also associated between the leading-out terminal of frequency converter and the switch KM3.
- 4. the grid-connected system for realizing soft starter for motor of high voltage converter as claimed in claim 1, it is characterised in that the high pressure Charging resistor is also associated between frequency converter and the switch KM1, the charging resistor is in parallel with switch KM4.
- 5. the grid-connected system for realizing soft starter for motor of high voltage converter as claimed in claim 1, it is characterised in that the high pressure Frequency converter includes：Clarke converters, Park converters, PI controllers, integrator, the triangular-wave generator being sequentially connected with；Institute Triangular-wave generator is stated also to be connected with the Park converters；The Clarke converters are used to carry out Clarke conversion to the grid voltage waveform；The Park converters are used to carry out Park conversion to the voltage waveform by Clark conversion；The PI controllers are used to carry out ratio and integral adjustment to the voltage waveform by Park conversion；The integrator is used to carry out integral operation to the voltage waveform by ratio and integral adjustment；The triangular-wave generator is used to being converted to the result of above-mentioned integral operation into three containing mains frequency and phase information Angle ripple.
- 6. a kind of grid-connected method for realizing soft starter for motor of high voltage converter, it is characterised in that comprise the following steps：Motor is stepped up to power frequency from 0Hz；High voltage converter detects line voltage in real time, after motor rises to power frequency, high voltage converter output and line voltage Phase, frequency and the consistent voltage of amplitude to the motor, then with the common motor of power network；After motor stabilizing operation setting individual one number time, only pass through power network motor；Wherein, the high voltage converter makes its output voltage be consistent with the line voltage as follows：The disturbance of itself bus is detected in real time, and it is compared with the line voltage；The line voltage is by voltage sample Module is sampled to obtain to line voltage, and the voltage sample module is connected to the letter of the power network and the high voltage converter Between number input；Modulated according to comparison result by SVPWM and real-Time Compensation is carried out to the busbar voltage, until the high voltage converter Output voltage is consistent with the amplitude of the line voltage.
- 7. the grid-connected method for realizing soft starter for motor of high voltage converter as claimed in claim 6, it is characterised in that the high pressure The phase and frequency of frequency converter line voltage described in real-time tracking as follows：Clarke conversion is carried out to the waveform of the line voltage by Charke converters；Park conversion is carried out to the voltage waveform by Clark conversion by Park converters；Ratio and integral adjustment are carried out to the voltage waveform by Park conversion by PI controllers；Integral operation is carried out to the voltage waveform by ratio and integral adjustment by integrator；Result Jing Guo above-mentioned integral operation is converted to three containing mains frequency and phase information by triangular-wave generator Angle ripple.
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| CN105262375B (en) * | 2015-11-16 | 2019-03-01 | 重庆师范大学 | Centrifuge frequency conversion control circuit and its control method |
| CN105871291B (en) * | 2016-04-11 | 2018-03-20 | 西南交通大学 | One kind is used for frequency converter with common frequency power network without impact switching method |
| CN105915120A (en) * | 2016-06-30 | 2016-08-31 | 苏州英威腾电力电子有限公司 | Buffer control circuit and buffer control method of motor device |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN102412593A (en) * | 2011-11-02 | 2012-04-11 | 哈尔滨九洲电气股份有限公司 | Grid-connected generation control method for photovoltaic power generation converter |
| CN202772819U (en) * | 2012-09-26 | 2013-03-06 | 天津方圆电气有限公司 | Frequency converter and electricity grid synchronization gapless switching control system |
| CN203071589U (en) * | 2012-12-27 | 2013-07-17 | 国电龙源电气有限公司 | Control system of photovoltaic grid-connected inverter |
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| US7911180B2 (en) * | 2008-07-31 | 2011-03-22 | GM Global Technology Operations LLC | Single-phase phase locked loop suitable for use in a hybrid vehicle charging system and method for charging a hybrid vehicle from a single-phase power source |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN102412593A (en) * | 2011-11-02 | 2012-04-11 | 哈尔滨九洲电气股份有限公司 | Grid-connected generation control method for photovoltaic power generation converter |
| CN202772819U (en) * | 2012-09-26 | 2013-03-06 | 天津方圆电气有限公司 | Frequency converter and electricity grid synchronization gapless switching control system |
| CN203071589U (en) * | 2012-12-27 | 2013-07-17 | 国电龙源电气有限公司 | Control system of photovoltaic grid-connected inverter |
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