CN103350935A - Energy-saving control system - Google Patents
Energy-saving control system Download PDFInfo
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- CN103350935A CN103350935A CN2013103003011A CN201310300301A CN103350935A CN 103350935 A CN103350935 A CN 103350935A CN 2013103003011 A CN2013103003011 A CN 2013103003011A CN 201310300301 A CN201310300301 A CN 201310300301A CN 103350935 A CN103350935 A CN 103350935A
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Abstract
The invention discloses an energy-saving control system. The energy-saving control system comprises an energy-saving control unit and a varying frequency driving unit. The energy-saving control unit comprises a rectifying circuit and an energy feedback circuit, wherein the rectifying circuit is used for converting alternating current of an input power grid into direct current and outputting the direct current to a direct current bus. The varying frequency driving unit is used for converting the direct current on the direct current bus into alternating current with adjustable frequency and voltage to drive a motor to work. The energy feedback circuit is located between the direct current bus and the input power grid, and is used for feeding regenerated energy on the direct current bus back to the input power grid in the descending or braking process of a lift. According to the energy-saving control system, the alternating current of the input power grid is converted into the direct current at the direct current bus side by means of the rectifying circuit, a direct current bus located at the output side of the rectifying circuit is connected with the input power grid at the input side of the rectifying circuit through the energy feedback circuit, so that the regenerated energy on the direct current bus is fed back to the input power grid through the energy feedback circuit, and therefore one-line recycling of regenerated energy is realized.
Description
Technical field
The present invention relates to the elevator control field, especially, relate to a kind of energy-saving control system for elevator control.
Background technology
Along with the development of science and technology, frequency conversion speed-adjusting is widely used.Such as the building hoist field; because the starting current when building hoist starts is large; and in descending process, there is larger potential energy; physical shock is large during each the shutdown; after frequency control was applied to building hoist, building hoist accelerated to given speed gradually by variable-frequency governor control, operated steadily, physical shock is little; and the consumption of current of building hoist becomes large, non-impact current gradually by little.When building hoist is descending, utilize the potential energy drive motor operation of building hoist self, consumption of current is little.Therefore, the building hoist of variable frequency control is directly controlled electric motor driven elevator with common employing AC contactor and is compared, and energy-saving efficiency is more than 40%.
A general building hoist has two cages to move up and down with the time delay standard knot, and the both sides cage has two to overlap independently electrical controller, and that is to say has two to overlap independently frequency-changing control system in variable-frequency construction elevator.At present, concerning low voltage frequency converter, its power circuit pattern almost is unified voltage-type, hand over--alternating current road directly--, being rectification---interchange turns direct current circuit, filter circuit, IGBT inverter circuit---direct current become the principle of alternating current circuit and finish the speed governing of electrical motor, thereby drive the variable-frequency construction elevator speed governing operation.In service at variable-frequency construction elevator, when building hoist is up, the outside horsepower output of frequency converter, when building hoist is descending, because the potential energy drive motor of load-carrying operation in cage, the cage, at this moment electrical motor is in generating state, be superimposed upon on the rectifying circuit of frequency converter after the flywheel diode rectification of electrical motor electricity amount by IGBT, thereby cause that frequency changer direct current bus voltage raises, this part electric energy that electrical motor is sent out when usually descending building hoist traditionally is regenerated energy.If this part regenerated energy that electrical motor sends is not consumed, can causes the rising of frequency changer direct current bus side voltage, thereby affect the normal operation of frequency converter.Existing general frequency converter regenerated energy processing mode is resistance braking, and namely when regenerated energy caused that the frequency converter bus voltage is elevated to a certain value, brake unit control regenerated energy consumed by dynamic braking unit in the heat energy mode.Therefore, the regenerated energy of frequency converter just has been wasted, and because dynamic braking unit can produce amount of heat when consuming this part regenerated energy, has a strong impact on the running environment of building hoist and frequency converter.
Summary of the invention
The object of the invention is to provide a kind of energy-saving control system, the technical matters that can't recycle to solve existing elevator regenerated energy descending or that braking generates under the situation.
For achieving the above object, the technical solution used in the present invention is as follows:
A kind of energy-saving control system is applicable to elevator, and elevator comprises cage, and cage moves up and down under the driving of electrical motor, and this energy-saving control system comprises Energy Saving Control unit and variable frequency drive unit;
The Energy Saving Control unit comprises rectifying circuit and energy feedback circuit;
Rectifying circuit is connected with variable frequency drive unit through dc bus, is converted to direct current (DC) for the alternating current that will input electrical network and exports dc bus to;
Variable frequency drive unit is connected with dc bus, is used for the direct current (DC) on the dc bus is converted to the adjustable alternating current driving motor work of voltage to frequency through inverter circuit;
Can feedback circuit, between dc bus and input electrical network, be used for descending at elevator or braking procedure with the Way of Regenerating Energy Feedback on the dc bus to inputting electrical network.
Further, connect a plurality of variable frequency drive unit through supply cable on the dc bus, the direct current (DC) on a plurality of variable frequency drive unit general DC busbars.
Further, the energy feedback circuit comprises voltage detection module, treater, driver module and inversion module;
Voltage detection module, the detection signal that also will detect vdc for detection of the vdc on the dc bus exports treater to;
Treater is used for according to the work of detection signal control driver module;
Inversion module is connected with dc bus, for the driving signal according to driver module the regenerated energy on the dc bus is reverse into alternating current and exports the input electrical network to.
Further, also be parallel with on the dc bus for the dynamic braking unit that consumes regenerated energy on the dc bus.
Further, inversion module is the inverter that is comprised of IGBT.
Further, supply cable is provided with over-current detection module and switch element, and the control end of switch element is connected with the mouth of over-current detection module, and switch element is according to output signal conducting or the disconnection supply cable of over-current detection module.
Further, the over-current detection module is current transformer, diverter or Hall element.
Further, switch element is relay or contactless switch.
Further, the energy feedback circuit also is provided with the fault output relay, and the fault output relay is connected with the control end of the unit of opening fire, with conducting or the disconnection of master cock unit.
Further, rectifying circuit is diode rectifier bridge, controllable silicon rectifying bridge or the four quadrant convertor that is comprised of IGBT.
The present invention has following beneficial effect:
Energy-saving control system of the present invention, the alternating current that utilizes the rectifying circuit of Energy Saving Control unit will input electrical network is converted to the direct current (DC) of dc bus side, and the dc bus that will be positioned at the rectifying circuit outgoing side couples together through energy feedback circuit and the input electrical network that is positioned at the rectifying circuit input side, so that the regenerated energy that is generated under the braking situation by DC bus powered variable frequency drive unit feeds back to the input electrical network through the energy feedback circuit, thereby realized the online recycling of regenerated energy, both improve the energy-saving efficiency of whole system, guaranteed again the stability of DC bus powered voltage.
Except purpose described above, feature and advantage, the present invention also has other purpose, feature and advantage.The below is with reference to figure, and the present invention is further detailed explanation.
Description of drawings
The accompanying drawing that consists of the application's a part is used to provide a further understanding of the present invention, and illustrative examples of the present invention and explanation thereof are used for explaining the present invention, do not consist of improper restriction of the present invention.In the accompanying drawings:
Fig. 1 is the structural representation that preferred embodiment of the present invention energy-saving control system is applied to elevator;
Fig. 2 is the electrical structure schematic diagram of preferred embodiment of the present invention energy-saving control system;
Fig. 3 is the electrical block diagram of Energy Saving Control unit in the preferred embodiment of the present invention; And
Fig. 4 is the electrical block diagram of variable frequency drive unit in the preferred embodiment of the present invention.
Description of reference numerals:
10, elevator; 11, cage; 12, standard knot; 20, Energy Saving Control unit; 30, variable frequency drive unit;
40, dc bus; 41, supply cable; 50, input electrical network; M, alternating-current motor/AC motor; 21, rectifying circuit;
22, energy feedback circuit; 221, voltage detection module; 222, treater; 223, driver module;
224, inversion module; 31, current limliting branch road; 32, conducting branch road.
The specific embodiment
Below in conjunction with accompanying drawing embodiments of the invention are elaborated, but the multitude of different ways that the present invention can be defined by the claims and cover is implemented.
With reference to Fig. 1 and Fig. 2, the preferred embodiments of the present invention provide a kind of energy-saving control system, are applicable to elevator 10, and this elevator 10 comprises that 11, two cages 11 of two cages move up and down along standard knot 12 respectively under the driving of two alternating-current motor/AC motor M.Embodiment of the invention energy-saving control system comprises Energy Saving Control unit 20 and variable frequency drive unit 30.Wherein, Energy Saving Control unit 20 comprises rectifying circuit 21 and energy feedback circuit 22; Rectifying circuit 21 is connected with variable frequency drive unit 30 through dc bus 40, is converted to direct current (DC) for the alternating current that will input electrical network 50 and exports dc bus 40 to; Variable frequency drive unit 30 is connected with dc bus 40, is used for that the direct current (DC) on the dc bus 40 is converted to the adjustable alternating current of voltage to frequency through inverter circuit and drives alternating-current motor/AC motor M work, thereby drive cage 11 is done frequency control along standard knot 12 dipping and heaving; Energy feedback circuit 22, between dc bus 40 and input electrical network 50, be used for descending at elevator 10 or braking procedure with the Way of Regenerating Energy Feedback on the dc bus 40 to inputting electrical network 50.With reference to Fig. 2, in embodiments of the present invention, two variable frequency drive unit link to each other with the direct current (DC) on the general DC busbar 40 with dc bus 40 through supply cable 41 respectively, and two variable frequency drive unit 30 drive respectively alternating-current motor/AC motor M work separately.Embodiment of the invention energy-saving control system, the alternating current that utilizes the rectifying circuit 21 of Energy Saving Control unit 20 will input electrical network 50 is converted to the direct current (DC) of dc bus 40 sides, and the dc bus 40 that will be positioned at rectifying circuit 21 outgoing sides couples together through energy feedback circuit 22 and the input electrical network 50 that is positioned at rectifying circuit 21 input sides, so that the regenerated energy that the variable frequency drive unit 30 of being powered by dc bus 40 generates under the braking situation feeds back to input electrical network 50 through energy feedback circuit 22, thereby realized the online recycling of regenerated energy, both improve the energy-saving efficiency of whole system, guaranteed again the stability of dc bus 40 power supply voltages.And owing to can be connected in parallel to two or more variable frequency drive unit 30 on the dc bus 40, thereby realized that a plurality of variable frequency drive unit 30 share the direct current (DC) of rectifying circuits 21 outputs, and the regenerated energy of a plurality of variable frequency drive unit 30 outputs can share an energy feedback circuit 22 and is fed back to input electrical network 50.
With reference to Fig. 3, in the present embodiment, energy feedback circuit 22 comprises voltage detection module 221, treater 222, driver module 223 and inversion module 224.Wherein, voltage detection module 221 also exports the detection signal of this vdc to treater 222 for detection of the vdc on the dc bus 40; Treater 222 is used for detection signal control driver module 223 work according to vdc; Inversion module 224 is connected with dc bus 40, for the driving signal according to driver module 223 regenerated energy on the dc bus 40 is reverse into alternating current and exports input electrical network 50 to.
The principle of work of energy feedback circuit 22 is as follows: when dc bus 40 sides form regenerated energy, vdc on the dc bus 40 raises, after the voltage that voltage detection module 221 detects dc bus 40 is elevated to certain value, treater 222 control driver modules 223 drive inversion module 224 work, and inversion module 224 is reverse into alternating current with the regenerated energy on the dc bus 40 and is fed back to input electrical network 50; Lower voltage on dc bus 40 is to certain value, and treater 222 automatically control driver module 223 stops to drive inversion module 224 work.In the present embodiment, inversion module 224 is the inverter that is comprised of IGBT, and the IGBT inverter is by following the tracks of the voltage waveform of inputting electrical network 50 three-phase input powers, inversion output and input electrical network 50 alternating current with the frequency homophase; Treater 222 is dsp processor.
In the embodiment of the invention, do simultaneously when upwards moving when two cages 11 of elevator 10, two variable frequency drive unit 30 that link to each other with dc bus 40 consume the electric energy on the dc bus simultaneously; If but in two cages 11 one does downward movement, another does upstroke, then the cage 11 continuous alternating-current motor/AC motor M of downward movement generate electricity, and generate regenerated energies through variable frequency drive unit 30 and export to dc bus 40, at this moment, the variable frequency drive unit 30 that can be done the cage 11 of upstroke of the regenerated energy on the dc bus 40 is directly utilized.If two cages 11 only have a downward movement or two to do simultaneously downward movement, then the regenerated energy of cage 11 generations of downward movement acts on the voltage rising that can cause on the dc bus 40 on the dc bus 40, and energy feedback circuit 22 can be converted to alternating current with the regenerated energy on the dc bus 40 according to the energizing signal that voltage detection module 221 generates and be fed back to input electrical network 50.
Preferably, also be parallel with on the dc bus 40 for the dynamic braking unit that consumes regenerated energy on the dc bus 40, like this, when energy feedback circuit 22 broke down, the regenerated energy on the dc bus 40 can adopt the mode of thermal energy consumption to dispose through dynamic braking unit.
With reference to Fig. 4, in the present embodiment, variable frequency drive unit 30 comprises filter capacitor C and converter unit F.Filter capacitor C is connected in parallel on the supply cable 41, is used for the direct current (DC) of input is carried out filtering to improve the stability of direct current (DC) output, reduces alternation pulse ripple to the impact of circuit; Converter unit F is used for becoming through the dc inverter of filter capacitor C output the adjustable alternating current of voltage to frequency to drive alternating-current motor/AC motor M work.
Because the capacitance of filter capacitor C is larger, preferably, supply cable 41 was also connected before access filter capacitor C and is provided with current limliting branch road 31, and the 31 two ends parallel connections of current limliting branch road are provided with the conducting branch road 32 that is used for coming according to the magnitude of voltage at filter capacitor C two ends short circuit current limliting branch road 31 more than.Among the wood embodiment, filter capacitor C adopts chemical capacitor, and current limliting branch road 31 comprises current-limiting resistance R and be used for preventing counteractive diode D, the current-limiting resistance R formation current limliting branch road 31 of connecting with diode D.Certainly, in other embodiments, current limliting branch road 31 can only comprise current-limiting resistance R.
In the present embodiment, playing anti-counteractive diode D can connect with current-limiting resistance R, also can be connected on the direct current inlet wire side of variable frequency drive unit 30, perhaps at the direct current inlet wire side adjunction rectifier bridge of variable frequency drive unit 30, if variable frequency drive unit 30 is through rectifier bridge access dc bus 40, no matter how "+" "-" utmost point of dc bus connects like this, variable frequency drive unit 30 can normally be moved, but prevent that with current-limiting resistance R series connection the diode D cost of reversal connection is minimum, energy consumption is minimum.
In the present embodiment, the two ends parallel connection of current limliting branch road 31 is provided with two multi-form conducting branch roads 32, and wherein, a conducting branch road 32 adopts contactless switch K, and contactless switch K is according to the magnitude of voltage action at filter capacitor C two ends; Another conducting branch road 32 adopts silicon control Q, and silicon control Q is according to the magnitude of voltage action at filter capacitor C two ends.Variable frequency drive unit 30 access direct supplys, when just powering on, supply cable 41 is given filter capacitor C charging through current limliting branch road 31, after filter capacitor C charges to certain voltage, contactless switch K is closed, silicon control Q conducting, dc bus 40 directly is connected with filter capacitor C, is reverse into the external alternating-current motor/AC motor M work of alternating current rear drive through filtered direct current (DC) through converter unit F.Wherein, converter unit F is the inverter that is comprised of IGBT.Certainly, it will be appreciated by those skilled in the art that, the two ends of current limliting branch road 31 are single conducting branch road 32 in parallel only, this conducting branch road 32 can adopt contactless switch K, the silicon control Q that is subjected to the control of filter capacitor C both end voltage, can also adopt other on-off elements such as relay that are subjected to the control of filter capacitor C both end voltage.
Current limliting branch road 31 not only can be arranged on "+" of supply cable 41 extreme on, also can be arranged on "-" of supply cable 41 extreme on.When the both positive and negative polarity wrong of supply cable 41, because current limliting branch road 31 has been provided with anti-counteraction diode D, therefore filter capacitor C can not charge at two ends, conducting branch road 32 not can not conducting because of the voltage at filter capacitor C two ends, thereby has guaranteed the trouble free service of variable frequency drive unit 30.
In the present embodiment, rectifying circuit 21 is diode rectifier bridge, controllable silicon rectifying bridge or the four quadrant convertor that is comprised of IGBT.When rectifying circuit 21 was diode rectifier bridge or controllable silicon rectifying bridge, the regenerated energy on the dc bus 40 was fed back on the input electrical network 50 through energy feedback circuit 22; Select the four quadrant convertor that is comprised of IGBT when rectifying circuit 21, the regenerated energy on the dc bus 40 can directly feed back to input electrical network 50 by four quadrant convertor.
Preferably, dc bus 40 is connected in parallel to two above variable frequency drive unit 30 through supply cable 41, and supply cable 41 is provided with over-current detection module and switch element, the control end of switch element is connected with the mouth of over-current detection module, and switch element is according to output signal conducting or the disconnection supply cable 41 of over-current detection module.Like this, both realized the direct supply of a plurality of variable frequency drive unit 30 general DC busbars 40 outputs, realized again that the energy feedback circuit 22 of regenerated energy through sharing that a plurality of variable frequency drive unit 30 form was fed back to input electrical network 50; And by controlling respectively the break-make of the supply cable 41 that links to each other with variable frequency drive unit 30, avoided interfering with each other between each variable frequency drive unit 30.Wherein, the over-current detection module is for detection of supply cable 41 overcurrent whether, and when supply cable 41 overcurrent, over-current detection module output energizing signal to disconnect supply cable 41, is realized the protection to variable frequency drive unit 30 to switch element; And by separately control, guaranteed to be independent of each other when each variable frequency drive unit 30 breaks down.In the present embodiment, the optional Current Transformer of over-current detection module, diverter or Hall element; Switch element can be selected relay or contactless switch.
Preferably, energy feedback circuit 22 is provided with the fault output relay, the fault output relay is connected with the control end of switch element, when having the faulty condition such as overcurrent, overvoltage when energy feedback circuit 22, fault output relay output switching signal is with the supply cable 41 that controls switch unit, thereby guarantee energy feedback circuit 22 under faulty condition, variable frequency drive unit 30 quits work.
In the present embodiment, with reference to Fig. 2, dc bus 40 is connected in parallel to two variable frequency drive unit 30 through two groups of supply cables 41, and each variable frequency drive unit 30 is controlled respectively and driven the alternating-current motor/AC motor M of cage 11 on one side, thereby controls separately the dipping and heaving of the cage 11 of elevator 10.The supply cable 41 of a variable frequency drive unit 30 is provided with current transformer H1 and contactless switch K1, and when current transformer H1 detected this supply cable 41 overcurrent, control contactor K1 disconnected the feed circuit of this variable frequency drive unit 30; The supply cable 41 of another variable frequency drive unit 30 is provided with current transformer H2 and contactless switch K2, and when current transformer H2 detected this supply cable 41 overcurrent, control contactor K2 disconnected the feed circuit of this variable frequency drive unit 30.
The embodiment of the invention is used for the energy-saving control system of elevator, the alternating current that to input electrical network 50 by rectifying circuit 21 is converted to direct current (DC), and export to two or more variable frequency drive unit 30 through dc bus 40, and the regenerated energy that a plurality of variable frequency drive unit 30 that share direct supply on this dc bus 40 produce can be used mutually, and unnecessary regenerated energy then is fed back to input electrical network 50 through concentrating through energy feedback circuit 22.Wood inventive embodiments energy-saving control system is not only applicable to building hoist, also is applicable to the frequency conversion speed-adjusting system that other have regenerated energy, such as various bonts, elevator, tower crane etc.
The above is the preferred embodiments of the present invention only, is not limited to the present invention, and for a person skilled in the art, the present invention can have various modifications and variations.Within the spirit and principles in the present invention all, any modification of doing, be equal to replacement, improvement etc., all should be included within protection scope of the present invention.
Claims (10)
1. an energy-saving control system is applicable to elevator (10), and described elevator (10) comprises cage (11), and described cage (11) moves up and down under the driving of electrical motor, it is characterized in that,
This energy-saving control system comprises Energy Saving Control unit (20) and variable frequency drive unit (30);
Described Energy Saving Control unit (20) comprises rectifying circuit (21) and energy feedback circuit (22);
Described rectifying circuit (21) is connected with described variable frequency drive unit (30) through dc bus (40), is converted to direct current (DC) for the alternating current that will input electrical network (50) and exports dc bus (40) to;
Described variable frequency drive unit (30) is connected with described dc bus (40), is used for that the direct current (DC) on the described dc bus (40) is converted to the adjustable alternating current of voltage to frequency through inverter circuit and drives described motor operation;
Described energy feedback circuit (22), be positioned between described dc bus (40) and the described input electrical network (50), be used for descending at described elevator (10) or braking procedure with the Way of Regenerating Energy Feedback on the described dc bus (40) to described input electrical network (50).
2. energy-saving control system according to claim 1 is characterized in that,
Described dc bus (40) is upper to connect a plurality of described variable frequency drive unit (30) through supply cable (41), and a plurality of described variable frequency drive unit (30) share the direct current (DC) on the described dc bus (40).
3. energy-saving control system according to claim 1 is characterized in that,
Described energy feedback circuit (22) comprises voltage detection module (221), treater (222), driver module (223) and inversion module (224);
Described voltage detection module (221), the detection signal that also will detect described vdc for detection of the vdc on the described dc bus (40) exports described treater (222) to;
Described treater (222) is used for controlling described driver module (223) work according to described detection signal;
Described inversion module (224), be connected with described dc bus (40), for the driving signal according to described driver module (223) regenerated energy on the described dc bus (40) be reverse into alternating current and export described input electrical network (50) to.
4. energy-saving control system according to claim 1 is characterized in that,
Also be parallel with on the described dc bus (40) be used to the dynamic braking unit that consumes the upper regenerated energy of described dc bus (40).
5. energy-saving control system according to claim 3 is characterized in that,
Described inversion module (224) is the inverter that is comprised of IGBT.
6. energy-saving control system according to claim 2 is characterized in that,
Described supply cable (41) is provided with over-current detection module and switch element, the control end of described switch element is connected with the mouth of described over-current detection module, and described switch element is according to the output signal conducting of described over-current detection module or disconnect described supply cable (41).
7. energy-saving control system according to claim 6 is characterized in that,
Described over-current detection module is current transformer, diverter or Hall element.
8. energy-saving control system according to claim 6 is characterized in that,
Described switch element is relay or contactless switch.
9. energy-saving control system according to claim 6 is characterized in that,
Described energy feedback circuit (22) also is provided with the fault output relay, and described fault output relay is connected with the control end of described switch element, with conducting or the disconnection of controlling described switch element.
10. energy-saving control system according to claim 1 is characterized in that,
Described rectifying circuit (21) is diode rectifier bridge, controllable silicon rectifying bridge or the four quadrant convertor that is comprised of IGBT.
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| CN105967009A (en) * | 2016-06-12 | 2016-09-28 | 日立电梯（中国）有限公司 | Multi-elevator control system, elevator system and elevator control method |
| CN115102431A (en) * | 2022-06-28 | 2022-09-23 | 上海儒竞智控技术有限公司 | Brake control device and system of direct current fan |
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Application publication date: 20131016 |