CN105356787A - Low frequency feedback control unit applied to frequency converter rectifying side - Google Patents
Low frequency feedback control unit applied to frequency converter rectifying side Download PDFInfo
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- CN105356787A CN105356787A CN201510369180.5A CN201510369180A CN105356787A CN 105356787 A CN105356787 A CN 105356787A CN 201510369180 A CN201510369180 A CN 201510369180A CN 105356787 A CN105356787 A CN 105356787A
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Abstract
The invention discloses a low frequency feedback control unit applied to a frequency converter rectifying side. The low frequency feedback control unit mainly comprises a power device IGBT, a current sensor and each control circuit board; the low frequency feedback control unit is connected with an electric reactor unit for realizing bidirectional flow of the energy in the rectifying side; the control circuit board collects three-phase power supply phase signals, and performs circuit modulation and conversion to convert the signals into power supply phase signals that can be recognized by a main control board; the main control board, strictly based on the power supply phase relations, controls the power device IGBT to be switched on and switched off based on a determined time sequence through computing by an internal program; the switch frequency of the power device IGBT is 50 Hz; the bidirectional flow of the energy in the rectifying side of the low frequency feedback control unit is realized under the 50 Hz switch frequency, so that the good energy-saving effect is realized, the number of parts is lowered, the equipment cost is saved, the heating of the equipment is lowered, and the operation stability of the equipment is improved.
Description
Technical field
Be applied to the low frequency feedback control unit of frequency converter rectification side.
Background technology
The pumping voltage that current frequency converter realizes in four quadrant running consumption DC bus loop has two kinds of modes, a kind of is rectification side employing three-phase PWM rectifying and voltage-stabilizing control technology, realizing the two-way flow of rectification side energy, electrical network can be fed back to producing due to electric power generation unnecessary energy by supply voltage phase relation.Another kind of adopt diode to carry out rectification for rectification side, and coordinate brake unit and brake resistance to realize DC loop energy ezpenditure, electric power generation produces unnecessary energy, controls brake resistance access in direct-current loop of frequency converter and carry out energy ezpenditure by brake unit.PWM rectifying and voltage-stabilizing control technology, due to the switch adopting high switching frequency (k level frequency) to control rectification side power device, under high-frequency work mode, the large heating of loss is comparatively large, hidden danger is larger for power device, this kind of mode also needs to coordinate radio-frequency rector and building-out capacitor to carry out work in addition, reactor need adopt and adapt to high frequency characteristics and special, under high-frequency operation mode, same heating is comparatively large, and equipment cost is higher, volume is larger.Rectification side adopts diode to carry out rectification, and coordinate brake unit and brake resistance to realize the mode of DC loop energy ezpenditure, can consume producing due to electric power generation the form that unnecessary energy generated heat by brake resistance, need outer preparation moving cell in high-power situation more, under this mode, equipment volume is larger, equipment is many, and cannot realize energy-saving effect, and it is more that equipment runs hidden danger.For effectively solving golf calorific value, high cost, the high failure rate under four-quadrant frequency converter rectification side high-frequency PWM rectifying and voltage-stabilizing control mode, and the shortcoming that the volume that single quadrant frequency converter prepares moving cell and brake resistance is outward large, equipment is many, failure rate is high, develop a kind of low frequency feedback control unit being applied to four-quadrant frequency converter rectification side, rectification side energy in bidirectional flow is realized under 50Hz switching frequency, while realizing good energy-saving effect, decrease number of components, save equipment cost, reduce equipment heating amount, improve the stability that equipment runs.
Summary of the invention
Many technical disadvantages that moving cell and brake resistance mode realize frequency converter four quadrant running are prepared outward in order to solve current PWM rectifying and voltage-stabilizing mode and single quadrant frequency converter, the invention provides a kind of low frequency feedback control unit being applied to frequency converter rectification side, described low frequency feedback control unit is mainly made up of power device IGBT, current sensor and each control circuit board, and this low frequency feedback control unit is connected the two-way flow realizing rectification side energy with reactor unit; Described control circuit board gathers three phase mains phase signal, be the power phase signal that master control borad can identify by circuit modulating transformation, master control borad is strictly according to power phase relation, by internal processes s operation control power device IGBT by determining that sequential turns on and off, the switching frequency of described power device IGBT is 50Hz, described control circuit board detects three-phase current signal and DC bus-bar voltage signal simultaneously, realizes the overcurrent to frequency converter, overvoltage protection; When frequency converter dragging motor works in motoring condition, load consumption frequency changer direct current bus electric energy, low frequency feedback control unit works in rectification state, for rear class provides energy; When frequency converter dragging motor works in generating state, the electric energy that motor produces makes DC bus-bar voltage raise by inversion side power device, when higher than supply voltage natural commutation value, master control borad automatically controls rectification side power device IGBT and carries out energy-feedback power grid in strict accordance with power phase, realizes energy-feedback power grid unnecessary for direct-current loop of frequency converter.
Beneficial effect of the present invention is:
Technical solution of the present invention is ensureing under the free of contamination prerequisite of electrical network, realize good energy-saving effect, only need adopt common industrial frequency reactor simultaneously, reduce the caloric value of reactor and rectification side power device, effectively improve job stability and the useful life of device, also eliminate the building-out capacitor in reactor unit and control contactor thereof in addition, entirety saves number of devices, structure is simpler, also reduces equipment cost, and improves the stability of equipment.
Below in conjunction with the drawings and specific embodiments, the present invention is described in further detail.
Accompanying drawing explanation
Fig. 1 is low frequency feedback control unit of the present invention and reactor unit main circuit schematic diagram.
Embodiment
As shown in Figure 1, low frequency feedback control unit of the present invention is electrically connected with reactor unit, described low frequency feedback control unit is applied to frequency converter rectification side, described low frequency feedback control unit is mainly made up of power device IGBT, current sensor and each control circuit board, and this low frequency feedback control unit is connected the two-way flow realizing rectification side energy with reactor unit; Described control circuit board gathers three phase mains phase signal, be the power phase signal that master control borad can identify by circuit modulating transformation, master control borad is strictly according to power phase relation, by internal processes s operation control power device IGBT by determining that sequential turns on and off, the switching frequency of described power device IGBT is 50Hz, described control circuit board detects three-phase current signal and DC bus-bar voltage signal simultaneously, realizes the overcurrent to frequency converter, overvoltage protection; When frequency converter dragging motor works in motoring condition, load consumption frequency changer direct current bus electric energy, low frequency feedback control unit works in rectification state, for rear class provides energy; When frequency converter dragging motor works in generating state, the electric energy that motor produces makes DC bus-bar voltage raise by inversion side power device, when higher than supply voltage natural commutation value, master control borad automatically controls rectification side power device IGBT and carries out energy-feedback power grid in strict accordance with power phase, realizes energy-feedback power grid unnecessary for direct-current loop of frequency converter.
Technical solution of the present invention is ensureing under the free of contamination prerequisite of electrical network, realize good energy-saving effect, only need adopt common industrial frequency reactor simultaneously, reduce the caloric value of reactor and rectification side power device, effectively improve job stability and the useful life of device, also eliminate the building-out capacitor in reactor unit and control contactor thereof in addition, entirety saves number of devices, structure is simpler, also reduces equipment cost, and improves the stability of equipment.
Scope is not limited to above-described embodiment, and every apparent technology distortion done according to the technology of the present invention principle, all falls within protection scope of the present invention.
Claims (1)
1. one kind is applied to the low frequency feedback control unit of frequency converter rectification side, it is characterized in that, described low frequency feedback control unit is mainly made up of power device IGBT, current sensor and each control circuit board, and this low frequency feedback control unit is connected the two-way flow realizing rectification side energy with reactor unit;
Described control circuit board gathers three phase mains phase signal, be the power phase signal that master control borad can identify by circuit modulating transformation, master control borad is strictly according to power phase relation, by internal processes s operation control power device IGBT by determining that sequential turns on and off, the switching frequency of described power device IGBT is 50Hz, described control circuit board detects three-phase current signal and DC bus-bar voltage signal simultaneously, realizes the overcurrent to frequency converter, overvoltage protection;
When frequency converter dragging motor works in motoring condition, load consumption frequency changer direct current bus electric energy, low frequency feedback control unit works in rectification state, for rear class provides energy;
When frequency converter dragging motor works in generating state, the electric energy that motor produces makes DC bus-bar voltage raise by inversion side power device, when higher than supply voltage natural commutation value, master control borad automatically controls rectification side power device IGBT and carries out energy-feedback power grid in strict accordance with power phase, realizes energy-feedback power grid unnecessary for direct-current loop of frequency converter.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510369180.5A CN105356787A (en) | 2015-06-30 | 2015-06-30 | Low frequency feedback control unit applied to frequency converter rectifying side |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201510369180.5A CN105356787A (en) | 2015-06-30 | 2015-06-30 | Low frequency feedback control unit applied to frequency converter rectifying side |
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| CN105356787A true CN105356787A (en) | 2016-02-24 |
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| CN201510369180.5A Pending CN105356787A (en) | 2015-06-30 | 2015-06-30 | Low frequency feedback control unit applied to frequency converter rectifying side |
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Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN201207618Y (en) * | 2008-02-13 | 2009-03-11 | 焦作市明株自动化工程有限责任公司 | Energy feedback device based on power unit series connection type high-voltage frequency transformer |
| CN201956961U (en) * | 2011-02-22 | 2011-08-31 | 武汉大学 | Energy feedback device based on power unit cascade type high voltage frequency converter |
| CN102510235A (en) * | 2011-10-31 | 2012-06-20 | 天津电气传动设计研究所 | Bi-directional power flow alternating current-direct current transforming power supply in voltage-type alternating current-direct current-alternating current frequency converter |
| CN202696477U (en) * | 2012-07-02 | 2013-01-23 | 天津电气传动设计研究所 | H-bridge cascading four-quadrant frequency converter on basis of self-shutdown device rectification/feedback power supply |
| CN103825470A (en) * | 2014-03-10 | 2014-05-28 | 台州富凌电气有限公司 | Four-quadrant frequency converter |
-
2015
- 2015-06-30 CN CN201510369180.5A patent/CN105356787A/en active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN201207618Y (en) * | 2008-02-13 | 2009-03-11 | 焦作市明株自动化工程有限责任公司 | Energy feedback device based on power unit series connection type high-voltage frequency transformer |
| CN201956961U (en) * | 2011-02-22 | 2011-08-31 | 武汉大学 | Energy feedback device based on power unit cascade type high voltage frequency converter |
| CN102510235A (en) * | 2011-10-31 | 2012-06-20 | 天津电气传动设计研究所 | Bi-directional power flow alternating current-direct current transforming power supply in voltage-type alternating current-direct current-alternating current frequency converter |
| CN202696477U (en) * | 2012-07-02 | 2013-01-23 | 天津电气传动设计研究所 | H-bridge cascading four-quadrant frequency converter on basis of self-shutdown device rectification/feedback power supply |
| CN103825470A (en) * | 2014-03-10 | 2014-05-28 | 台州富凌电气有限公司 | Four-quadrant frequency converter |
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Application publication date: 20160224 |