CN201947168U - Starting control device for PWM (Pulse-Width Modulation) rectifier of sensor without network-side electrodynamic force - Google Patents
Starting control device for PWM (Pulse-Width Modulation) rectifier of sensor without network-side electrodynamic force Download PDFInfo
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- CN201947168U CN201947168U CN2011200515442U CN201120051544U CN201947168U CN 201947168 U CN201947168 U CN 201947168U CN 2011200515442 U CN2011200515442 U CN 2011200515442U CN 201120051544 U CN201120051544 U CN 201120051544U CN 201947168 U CN201947168 U CN 201947168U
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Abstract
A starting control device for a PWM (Pulse-Width Modulation) rectifier of a sensor without network-side electrodynamic force belongs to a rectifier starting device controlled by electrical engineering variable current. A three-phase alternating-current power supply of the control device is connected with a precharge current-limiting resistor through a three-phase power supply switch and then connected to a power converter through a three-phase reactor; the output of the power converter is connected with a direct current filter capacitor; a phase-shift and power factor angle compensator is connected with a virtual voltage orientation angle arithmetic device; and the virtual voltage orientation angle arithmetic device passes through a virtual network-side electrodynamic force rebuilder and a virtual magnetic flux linkage arithmetic device in sequence and then is connected with a system controller; a current sensor is connected on a line between the three-phase reactor and the power converter; the output end of the current sensor is connected with a current orientation angle arithmetic device through a four-order low pass filter; and the output end of the current orientation angle arithmetic device is connected with the virtual voltage orientation angle arithmetic device. The starting control device is easy to realize, achieves the controllable operation of PWM of the sensor without network-side electrodynamic force, and improves the system reliability.
Description
Technical field
The present invention relates to a kind of rectifier start-up control device of electrical engineering unsteady flow control, particularly a kind of no net side electromotive force transducer PWM rectifier start-up control device.
Background technology
It is controlled that the PWM rectifier has output voltage, ac-side current sine degree height, and advantage such as power factor is controlled becomes the requisite front end net of four-quadrant high-performance power inverter side interface in recent years gradually.
In the high-power applications occasion, because making, the distortion of voltage on line side adopt the PWM rectifier performance of voltage oriented control to be subjected to certain influence, can further aggravate the distortion of voltage on line side conversely again, become vicious circle.In recent years, adopting virtual flux linkage orientation control mode to solve the problems referred to above is generally accepted in the industry.
Virtual flux linkage orientation control mode can be saved net side electromotive force transducer in essence; thereby improve the reliability of system; but because the initial value uncertainty of virtual flux observation; make and bigger impulse current in start-up course, often occurs; cause the system failure or protection action, the system that influences normally moves.
Relevant document employing is carried out virtual flux linkage orientation initial value observation in the method that initial start stage applies zero vector, but because the unknown of electrical network phase place, electric current can not be predicted and be uncontrollable, very easily causes system's overcurrent, and still need during observation electric current is carried out differential, observation error is bigger.
Summary of the invention
The purpose of this utility model is that a kind of no net side electromotive force transducer PWM rectifier start-up control device will be provided, solution is carried out virtual flux linkage orientation initial value observation in the method that initial start stage applies zero vector, but because electrical network phase place the unknown, electric current can not be predicted and be uncontrollable, very easily cause system's overcurrent, and still need during observation electric current to be carried out differential, the problem that observation error is bigger.
The purpose of this utility model is achieved in that this control device three-phase alternating-current supply links to each other with the preliminary filling current-limiting resistance through three-phase power switch, is connected to power inverter through three-phase reactor again, and power inverter output links to each other with dc filter capacitor; Be parallel with the contact of three-phase ac contactor at two ends of preliminary filling current-limiting resistance, the input of system controller is connected with the signal output part of power inverter, and the output of system controller is connected with the control coil of three-phase ac contactor; Phase shift and power-factor angle compensator are connected with virtual voltage orientation angle arithmetic unit, virtual voltage orientation angle arithmetic unit is connected with system controller with virtual magnetic linkage arithmetic unit by virtual net side electromotive force reconstructor in proper order, and virtual voltage orientation angle arithmetic unit directly is connected with system controller simultaneously; On the circuit between three-phase reactor and the power inverter, be connected with current sensor, the output of current sensor is connected with current oriention angle arithmetic unit by the quadravalence low pass filter, and the output of current oriention angle arithmetic unit is connected with virtual voltage orientation angle arithmetic unit.
Beneficial effect, owing to adopted such scheme, when closing three-phase power switch, system enters not to be controlled rectification electric capacity is carried out charging process, charging current is made up of preliminary filling current-limiting resistance, three-phase reactor and DC filtering electric current
RLCCircuit determines.Because charging current is not for controlling rectified current, it is bigger to distort, therefore will carry out first-harmonic through the quadravalence low pass filter by the actual three-phase charging current signal that current sensor senses goes out and extract, then by current oriention angle arithmetic unit and phase shift and power-factor angle compensator output virtual voltage orientation angle.Along with the rising of dc filter capacitor voltage, charging current reduces gradually and becomes and be difficult to observation, therefore in DC voltage rising to 60% o'clock that does not control commutating voltage, switch to virtual voltage orientation angle arithmetic unit and carry out computing and output.
Be virtual accurately flux linkage orientation angle before obtaining the PWM rectification and starting, the virtual flux linkage orientation angle before the virtual voltage orientation angle is started by net side electromotive force reconstructor and the output of virtual flux linkage orientation angle arithmetic unit guarantees the start-up course of non-impact current.Solve the method that applies zero vector in initial start stage and carried out virtual flux linkage orientation initial value observation, but because electrical network phase place the unknown, electric current can not be predicted and be uncontrollable, very easily cause system's overcurrent, and still need during observation electric current is carried out differential, the problem that observation error is bigger has reached the purpose of this utility model.
Advantage: this device is easy to realize, does not influence the operation time and the control effect of follow-up controlled rectification, and virtual flux linkage orientation initial value observation has accurately really realized no net side electromotive force transducer PWM controlled rectification operation, has improved the reliability of system.
Description of drawings
Fig. 1 does not have net side electromotive force transducer PWM rectifier start-up control system diagram for the utility model.
Among the figure: 1, three-phase alternating-current supply; 2, three-phase power switch; 3, preliminary filling current-limiting resistance; 4, three-phase ac contactor; 5, three-phase reactor; 6, current sensor; 7, power inverter; 8, dc filter capacitor; 9, quadravalence low pass filter; 10, current oriention angle arithmetic unit; 11, virtual voltage orientation angle arithmetic unit; 12, phase shift and power-factor angle compensator; 13, virtual net side electromotive force reconstructor; 14, virtual magnetic linkage arithmetic unit; 15, system controller.
Embodiment
Embodiment 1: no net side electromotive force transducer PWM rectifier start-up control device: three-phase alternating-current supply 1 links to each other with preliminary filling current-limiting resistance 3 through three-phase power switch 2, be connected to power inverter 7 through three-phase reactor 5 again, power inverter 7 outputs link to each other with dc filter capacitor 8; Be parallel with the contact of three-phase ac contactor 4 at two ends of preliminary filling current-limiting resistance 3, the input of system controller 15 is connected with the signal output part of power inverter 7, and the output of system controller 15 is connected with the control coil of three-phase ac contactor 4; Phase shift and power-factor angle compensator 12 are connected with virtual voltage orientation angle arithmetic unit 11, virtual voltage orientation angle arithmetic unit 11 orders are connected with system controller 15 with virtual magnetic linkage arithmetic unit 14 by virtual net side electromotive force reconstructor 13, and virtual voltage orientation angle arithmetic unit 11 directly is connected with system controller 15 simultaneously; On the circuit between three-phase reactor 5 and the power inverter 7, be connected with current sensor 6, the output of current sensor 6 is connected with current oriention angle arithmetic unit 10 by quadravalence low pass filter 9, and the output of current oriention angle arithmetic unit 10 is connected with virtual voltage orientation angle arithmetic unit 11.
When closing three-phase power switch 2, system enters not to be controlled rectification electric capacity is carried out charging process, and charging current is made up of preliminary filling current-limiting resistance 3, three-phase reactor 5 and DC filtering electric current 8
RLCCircuit determines.Because charging current is not for controlling rectified current, it is bigger to distort, therefore will carry out first-harmonic through quadravalence low pass filter 9 by current sensor 6 detected actual three-phase charging current signals and extract, then by current oriention angle arithmetic unit 10 and phase shift and power-factor angle compensator 12 output virtual voltage orientation angles.Along with the rising of dc filter capacitor voltage, charging current reduces gradually and becomes and be difficult to observation, therefore in DC voltage rising to 60% o'clock that does not control commutating voltage, switch to virtual voltage orientation angle arithmetic unit 11 and carry out computing and output.
Be virtual accurately flux linkage orientation angle before obtaining the PWM rectification and starting, the virtual flux linkage orientation angle before the virtual voltage orientation angle is started by net side electromotive force reconstructor 13 and 14 outputs of virtual flux linkage orientation angle arithmetic unit guarantees the start-up course of non-impact current.
Described power inverter 7, dc filter capacitor 8, quadravalence low pass filter 9, current oriention angle arithmetic unit 10, virtual voltage orientation angle arithmetic unit 11, phase shift and power-factor angle compensator 12, virtual net side electromotive force reconstructor 13, virtual magnetic linkage arithmetic unit 14 and system controller 15 are the commercially available prod.
Claims (1)
1. no net side electromotive force transducer PWM rectifier start-up control device, it is characterized in that: the three-phase alternating-current supply of this control device links to each other with the preliminary filling current-limiting resistance through three-phase power switch, be connected to power inverter through three-phase reactor again, power inverter output links to each other with dc filter capacitor; Be parallel with the contact of three-phase ac contactor at two ends of preliminary filling current-limiting resistance, the input of system controller is connected with the signal output part of power inverter, and the output of system controller is connected with the control coil of three-phase ac contactor; Phase shift and power-factor angle compensator are connected with virtual voltage orientation angle arithmetic unit, virtual voltage orientation angle arithmetic unit is connected with system controller with virtual magnetic linkage arithmetic unit by virtual net side electromotive force reconstructor in proper order, and virtual voltage orientation angle arithmetic unit directly is connected with system controller simultaneously; On the circuit between three-phase reactor and the power inverter, be connected with current sensor, the output of current sensor is connected with current oriention angle arithmetic unit by the quadravalence low pass filter, and the output of current oriention angle arithmetic unit is connected with virtual voltage orientation angle arithmetic unit.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011200515442U CN201947168U (en) | 2011-03-01 | 2011-03-01 | Starting control device for PWM (Pulse-Width Modulation) rectifier of sensor without network-side electrodynamic force |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011200515442U CN201947168U (en) | 2011-03-01 | 2011-03-01 | Starting control device for PWM (Pulse-Width Modulation) rectifier of sensor without network-side electrodynamic force |
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| Publication Number | Publication Date |
|---|---|
| CN201947168U true CN201947168U (en) | 2011-08-24 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2011200515442U Expired - Lifetime CN201947168U (en) | 2011-03-01 | 2011-03-01 | Starting control device for PWM (Pulse-Width Modulation) rectifier of sensor without network-side electrodynamic force |
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| Country | Link |
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| CN (1) | CN201947168U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102158065A (en) * | 2011-03-01 | 2011-08-17 | 徐州中矿大传动与自动化有限公司 | Method and device for controlling startup of PWM (pulse width modulation) rectifier without network side electrodynamic potential sensor |
-
2011
- 2011-03-01 CN CN2011200515442U patent/CN201947168U/en not_active Expired - Lifetime
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102158065A (en) * | 2011-03-01 | 2011-08-17 | 徐州中矿大传动与自动化有限公司 | Method and device for controlling startup of PWM (pulse width modulation) rectifier without network side electrodynamic potential sensor |
| CN102158065B (en) * | 2011-03-01 | 2013-01-30 | 徐州中矿大传动与自动化有限公司 | Method for controlling startup of PWM (pulse width modulation) rectifier without network side electrodynamic potential sensor |
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| Date | Code | Title | Description |
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| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CX01 | Expiry of patent term | ||
| CX01 | Expiry of patent term |
Granted publication date: 20110824 |