CN103066818A - Mixed-frequency wave suppression device and method for frequency mixing test - Google Patents
Mixed-frequency wave suppression device and method for frequency mixing test Download PDFInfo
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- CN103066818A CN103066818A CN2013100272726A CN201310027272A CN103066818A CN 103066818 A CN103066818 A CN 103066818A CN 2013100272726 A CN2013100272726 A CN 2013100272726A CN 201310027272 A CN201310027272 A CN 201310027272A CN 103066818 A CN103066818 A CN 103066818A
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Abstract
The invention discloses a mixed-frequency wave suppression device for a frequency mixing test. The device comprises a supporting capacitor which is connected in parallel with two ends of a direct current bus and is used for guaranteeing voltage stability of the direct current bus, a voltage rising or dropping chipping circuit which is connected to two ends of the supporting capacity and is used for rising or dropping voltage on the supporting capacity when the voltage on the supporting capacitor is overlow or overhigh, and a controller, wherein the input of the controller is connected to the supporting capacitor and is used for detecting the voltage on the supporting capacitor; the output of the controller is connected to the control end of the voltage rising or dropping chipping circuit; when the voltage is greater than a preset first threshold value, the controller sends a control signal to make the voltage rising or dropping chipping circuit work in a voltage dropping chopping state; and when the voltage is smaller than a preset second threshold value, the controller sends a control signal to make the voltage rising or dropping chipping circuit work in a voltage rising chopping state. By the mixed-frequency wave suppression device, fluctuation of the voltage on the direct current bus can be quickly stabilized, so that the investment of a user is saved, the energy loss is reduced, and the efficiency is improved.
Description
Technical field
The present invention relates to electric and electronic technical field, relate in particular to a kind of AC induction motor and fold folded frequency wave suppression device and the method that adopts when frequently testing.
Background technology
Folded frequently test is the method for carrying out a kind of simple economy of AC induction motor heat test.The folded frequently principle of test is exactly to make AC induction motor in constantly conversion between acceleration and deceleration under the state of zero load.Manage to make the synchronous speed of AC induction motor sometimes fast and sometimes slow during test, rotor just needs larger moment to remove to overcome inertia in order to follow the tracks of synchronous speed.Therefore greatly increased the no-load current of motor, just can make the no-load current of motor reach the size of rated current by speed and the frequency of adjusting acceleration and deceleration, thereby examine the temperature rise situation of motor when rated current to finish the heat test of motor.Because during folded frequently the test, motor does not have shaft power output, thus the input power that test needs much smaller than the rated power of motor, the heat test of very suitable high power AC asynchronous machine can be saved a large amount of electric energy.
Along with the progress of technology, folded frequently test is finished by variable frequency power supply now mostly.As shown in Figure 1, wherein shown the system of asynchronous machine being folded the frequency test.Comprising special-purpose variable frequency power supply, this power supply has rectification circuit 102, is parallel on the electrical network 101, is used for the AC energy on the electrical network 101 is converted to direct current energy.At the output two ends of rectification circuit 102, namely be parallel with Support Capacitor C on the positive and negative polarities of DC power supply, it is used for the fluctuation on the stable DC bus.Because, when the folded frequency of motor is tested, testing of electric motors 104 is changed under the state of electronic and generating continually, and the fluctuation on the more common variable frequency power supply of the fluctuation on the dc bus is large, and therefore the capacity of the Support Capacitor C in the folded frequently test is more much larger than the capacity of electric capacity on the common variable frequency power supply.
When AC induction motor 104 is operated in electronic operating mode, asks for energy to dc bus and cause DC bus-bar voltage to descend; When AC induction motor 104 is operated in generating operation mode, cause DC bus-bar voltage to rise to the dc bus feedback energy.Folded power is larger frequently, and the bus fluctuation is just larger, and bus fluctuateed conference so that rectifier cell or the overvoltage of inversion element damage and the output accuracy of the folded frequently test of impact and stable.
At present, the fluctuation when testing in order to reduce folded frequency on the bus, method commonly used has following three kinds:
(1) capacity of increase dc bus Support Capacitor C.So that the ability of dc bus storage and release electric charge improves the inevitable size that also just reduce the DC bus-bar voltage fluctuation.But because motor needs the electric capacity guarantee DC bus-bar voltage fluctuation of huge capacity in normal range (NR) absorbing fast and feedback energy during folded frequently the test, the cost of doing like this is very huge, generally can't bear.
(2) resistance power consumption method.By the input of high-speed electronic switch controlling resistance at the dc bus two ends, when DC bus-bar voltage is too high, drops into the resistance consumption feedback energy and reduce busbar voltage, excision resistance when dc bus drops to a certain degree.The method can reduce the capacity of dc bus Support Capacitor, but can only limit the peak of dc bus, can't reduce the fluctuation of bus, and the resistance heating of need to consuming energy, and can increase the test loss.
(3) inversion feedback method.Resistance power consumption method is that the energy of feedback is consumed in vain, and we also can feed back to electrical network to it and just produce inversion feedback method.Dc bus be connected electrical network and directly connect an inverter, can feed back to the energy on the dc bus on the input electrical network by inversion.Reduce like this test loss and improved system effectiveness.But inverter structure is complicated, cost is higher, key be the same with resistance power consumption method can only peak clipping and can't fill out paddy, therefore, can not effectively reduce the dc bus fluctuation.
Summary of the invention
The present invention is directed to and fold in the prior art when frequently testing, not have simply can effectively reduce the shortcoming of the device of the fluctuation on the dc bus, proposed a kind of simple in structure, without the folded frequency wave suppression device of the device that consumes energy, described folded frequency wave suppression device comprises:
Support Capacitor, it is connected in parallel on the dc bus two ends, is used for the voltage stabilization on the assurance dc bus;
The lifting/voltage reducing chopper circuit, it is connected to described Support Capacitor two ends, is used for when too low or too high for voltage on described Support Capacitor rising or reduces voltage on the described Support Capacitor;
Controller, its input is connected on the Support Capacitor, to detect the voltage on the described Support Capacitor, output is connected on the control end of described lifting/voltage reducing chopper circuit, when described voltage surpasses default first threshold, send control signal so that described lifting/voltage reducing chopper circuit is operated in the buck chopper state, when described voltage is lower than default Second Threshold, send control signal so that described lifting/voltage reducing chopper circuit is operated in the boost chopper state
Wherein, described lifting/voltage reducing chopper circuit comprises the first and second switch elements and inductance element, described the first switch element and described second switch element are connected on the dc bus two ends, the node of series connection links to each other with an end of described inductance element, storage capacitor in parallel between the other end of described inductance element and the negative pole of dc bus.
According to one embodiment of present invention, the output of described controller is connected respectively to the control end of described the first switch element and described second switch element alternately to be in off state or pulse-width modulation PWM state according to described the first switch element of the voltage control that is detected and described second switch element.
According to one embodiment of present invention, recently control time that discharges and recharges to described storage capacitor by the duty of control pulse-width modulation PWM.
According to one embodiment of present invention, described the first switch element and second switch element are the insulated gate bipolar transistor IGBT element.
According to one embodiment of present invention, the collector electrode of described the first switch element is connected to the positive pole of dc bus, its emitter is connected to the collector electrode of described second switch element, the emitter of described second switch element is connected to the negative pole of dc bus, one end of described inductance element is connected to the junction of described the first switch element and described second switch element, the other end connects an end of described storage capacitor, and the other end of described storage capacitor connects the negative pole of dc bus.
According to one embodiment of present invention, be connected in parallel to the energy consumption circuit at described storage capacitor, its control end links to each other with the output of described controller, starts described energy consumption circuit working when described controller detects overtension on the described storage capacitor.
According to one embodiment of present invention, described energy consumption circuit comprises switch element and the resistive element that is connected in series.
According to one embodiment of present invention, described controller also detects the charging and discharging currents on the described Support Capacitor.
According to another aspect of the present invention, also provide a kind of folded frequency to press down the method for ripple, said method comprising the steps of:
Magnitude of voltage on S401, the detection dc bus and the electric current that flows through Support Capacitor;
S402, compare with predefined first threshold and Second Threshold, if described magnitude of voltage is higher than described first threshold, then send control signal so that circuit working at the buck chopper state, thereby dc bus is charged to parallel connection electric capacity thereon,
When if the described magnitude of voltage of S403 is lower than described Second Threshold, then send control signal so that circuit working at the boost chopper state, thereby make the electric capacity that is connected in parallel on the dc bus with electric energy feedback to dc bus;
Wherein, by the duty ratio of setup control signal periodically, can control described circuit to the time of described capacitor charging or with the time of electric energy feedback to dc bus.
Application of the present invention is the fluctuation on the stable DC bus soon, thereby the investment of having saved the user has reduced energy loss, has improved efficient.
Other features and advantages of the present invention will be set forth in the following description, and, partly from specification, become apparent, perhaps understand by implementing the present invention.Purpose of the present invention and other advantages can realize and obtain by specifically noted structure in specification, claims and accompanying drawing.
Description of drawings
Fig. 1 has shown the theory diagram of motor being folded the system of frequently testing;
Fig. 2 is the concrete special-purpose variable frequency power supply circuit diagram that adopts according to one embodiment of present invention;
Fig. 3 is used for the folded frequently circuit theory diagrams of the folded frequency wave suppression device of test according to one embodiment of present invention;
Fig. 4 folds the method flow diagram that frequently presses down ripple according to one embodiment of present invention under folded frequently test.
Embodiment
Describe embodiments of the present invention in detail below with reference to drawings and Examples, how the application technology means solve technical problem to the present invention whereby, and the implementation procedure of reaching technique effect can fully understand and implements according to this.Need to prove, only otherwise consist of conflict, each embodiment among the present invention and each feature among each embodiment can mutually combine, and formed technical scheme is all within protection scope of the present invention.
In addition, can in the computer system such as one group of computer executable instructions, carry out in the step shown in the flow chart of accompanying drawing, and, although there is shown logical order in flow process, but in some cases, can carry out step shown or that describe with the order that is different from herein.
When carrying out folded frequency test of the present invention, the variable frequency power supply that adopts as shown in Figure 2, it comprises the rectification circuit that is made of 6 diodes, 6 inverter circuits that transistor consists of.In addition, for the impact of harmonic reduction for electric machine temperature rise, also configured sine wave filter.
Above variable frequency power supply only is for principle of the present invention clearly is described, in fact, the present invention is not limited to this folding the variable frequency power supply that adopts when frequently testing.
Embodiment one:
Voltage fluctuation on the dc bus when making that AC induction motor is folded to be tested frequently is little, and the capacity of Support Capacitor C do not need again very greatly, and the present invention has designed a kind of folded frequency wave suppression device, and its circuit theory as shown in Figure 3.It comprises Support Capacitor C1, lifting/voltage reducing chopper circuit 201 and controller 202.
Wherein, Support Capacitor C1 is connected in parallel on the dc bus two ends, is used for the voltage stabilization on the assurance dc bus.Lifting/voltage reducing chopper circuit 201 is connected to Support Capacitor C1 two ends; be used for when too low or too high for voltage on the Support Capacitor C1, raising or reduction Support Capacitor C1 on voltage; the voltage on the dc bus namely; with the fluctuation on the minimizing dc bus, thus each components and parts of protection variable frequency power supply.
The input of controller 202 is connected on the Support Capacitor C1, to detect the voltage on the Support Capacitor C1, output is connected to the control end 1 of lifting/voltage reducing chopper circuit 201, on 2, when the voltage on the C1 that detects surpasses default first threshold, send control signal so that lifting/voltage reducing chopper circuit 201 is operated in the buck chopper state, when voltage is lower than default Second Threshold, send control signal so that lifting/voltage reducing chopper circuit 201 is operated in the boost chopper state.
The first and second threshold values are set by the capacity of controller 202 internal condition testing of electric motors.
Lifting/voltage reducing chopper circuit 201 comprises the first and second switch element T1, T2 and inductance component L, the first switch element T1 and second switch elements T 2 are connected on the dc bus two ends, the node of series connection links to each other with an end of inductance component L, storage capacitor C2 in parallel between the negative pole DC-of the other end of inductance component L and dc bus.
By closure and the turn-off time of controlling the first and second switch elements, just can control the charge and discharge process between dc bus and the storage capacitor C2.In specific embodiments of the invention, the output of controller 202 is connected respectively to the control end of the first switch element T1 and second switch elements T 2 alternately to be in off state or pulse-width modulation PWM state according to voltage control the first switch element T1 and the second switch elements T 2 that are detected.Controller is recently controlled time that discharges and recharges to storage capacitor C2 by the duty of control pulse-width modulation PWM, thereby realizes the voltage stable output within the specific limits on the dc bus.
The first switch element T1 and second switch elements T 2 are the insulated gate bipolar transistor IGBT element.By the voltage between control grid and the emitter, just can control switch elements T 1 and the closed off state of T2.That is to say, the output of controller is connected to the grid of insulated gate bipolar transistor IGBT element, and grid is as the control end 1,2 of this switch element.Certainly, the invention is not restricted to this, as long as these switch elements have controlled characteristics, just all can realize the present invention.
In lifting/voltage reducing chopper circuit 201 as shown in Figure 3, the collector electrode of the first switch element T1 is connected to the anodal DC+ of dc bus, its emitter is connected to the collector electrode of second switch elements T 2, the emitter of second switch elements T 2 is connected to the negative pole DC-of dc bus, one end of inductance component L is connected to the junction of the first switch element T1 and second switch elements T 2, the other end connects the end of storage capacitor C2, and the other end of storage capacitor C2 connects the negative pole DC-of dc bus.
In addition, can also be at the storage capacitor C2 energy consumption circuit 203 that is connected in parallel, its control end 3 links to each other with the output of controller 202.Voltage on the storage capacitor C2 is as the input of controller 202, when controller 202 detects overtension on the storage capacitor C2, sends control signal to control end 3, starts 203 work of energy consumption circuit.
As shown in Figure 3, energy consumption circuit 203 comprises switch element T3 and the resistive element R that is connected in series.Equally, in specific embodiments of the invention, select the insulated gate bipolar transistor IGBT element as switch element.And the invention is not restricted to this, those skilled in the art obviously can expect adopting other controlled switch elements according to instruction of the present invention.
In an embodiment of the present invention, controller 202 also detects the charging and discharging currents on the Support Capacitor C1.Because it is the variation of DC bus-bar voltage that the charging and discharging currents of C1 changes faster than its both end voltage, so the charging and discharging currents that controller detects C1 can make faster response to the variation of DC bus-bar voltage, can better suppress the fluctuation of dc bus.
Embodiment two:
The below introduces the operation principle of folded frequency wave suppression device of the present invention.
As mentioned above, controller 202 gathers Support Capacitor C1 and the voltage at storage capacitor C2 two ends and the electric current that flows through C1, subsequently through calculating the control signal of exporting to switch element T1 ~ T3.
When namely Support Capacitor C1 both end voltage rising of DC bus-bar voltage, the charging and discharging currents that flows through Support Capacitor C1 must increase, this Time Controller 202 outputs a control signal to control end 2, to turn-off second switch elements T 2, so that the first switch element T1 is operated in the PWM state under the effect of control end 1, this Time Controller sends pwm signal to control end 1.When pwm signal was controlled the first switch element T1 closure, DC bus-bar voltage was charged to storage capacitor C2 by the first switch element T1, inductance component L; When pwm signal is controlled the first switch element T1 and is turn-offed, by the crystal diode among C2, the T2 to the inductance component L afterflow.The duty ratio of the PWM waveform when controlling the first switch element T1 work namely can be controlled dc bus to the charging size of storage capacitor C2.
If storage capacitor C2 is overcharged with electricity, both end voltage raises when excessive, can also by closed the 3rd switch element T3 of control, consume the energy of storage capacitor C2 by the resistance R in the power consumption circuit 203, thereby reduce the voltage at storage capacitor C2 two ends.
When the DC bus-bar voltage reduction, the charging and discharging currents that flows through Support Capacitor C1 must reduce, and turn-off the first switch element T1 this moment, makes second switch elements T 2 be operated in the PWM state.When the pwm signal of controller 202 outputs made second switch elements T 2 closure, storage capacitor C2 was the inductance component L charging by 2 discharges of second switch elements T; When the pwm signal of controller 202 outputs turn-offed second switch elements T 2, inductance component L was by the diode continuousing flow of the first switch element T1, and the energy of storage capacitor C2 storage has been discharged into dc bus.By the duty ratio of control second switch elements T 2 work PWM, namely can control the energy size that storage capacitor C2 discharges to dc bus.
Folded so frequently wave suppression device just can play the effect of peak load shifting, and smooth better dc bus has kept stablizing of dc bus.During normal operation, folded frequency wave suppression device of the present invention does not have dissipative cell work, so loss seldom, system effectiveness is very high.Only have when the excessive so that storage capacitor C2 overtension of feedback energy, just start the power consumption circuit 203 that the 3rd switch element T3 and resistance R form.When storage capacitor C2 voltage drop power consumption circuit after below the safety value namely quits work.
Embodiment three:
According to the above embodiments, the present invention also provides a kind of and folded the method that frequently presses down ripple under folded frequently test, and the method as shown in Figure 4.
In step S401, the current value that detects the magnitude of voltage on the dc bus and flow through.In embodiment disclosed by the invention, namely detect or gather the voltage at Support Capacitor C1 two ends by controller 202.In addition, controller 202 also acquisition stream is crossed the electric current of Support Capacitor C1, thereby accelerates controller to the response speed of circuit overvoltage or under-voltage condition, realizes as much as possible stablizing on the dc bus.
In step S402, compare with predefined first threshold and Second Threshold, if magnitude of voltage is higher than first threshold, then send control signal so that circuit working at the buck chopper state, thereby dc bus is charged to parallel connection electric capacity thereon.
In step S403, if when magnitude of voltage is lower than Second Threshold, then send control signal so that circuit working at the boost chopper state, thereby make the electric capacity that is connected in parallel on the dc bus with electric energy feedback to dc bus.
By the duty ratio of setup control signal periodically, can control to the time of capacitor charging or with the time of electric energy feedback to dc bus.
In addition, according to embodiments of the invention, thereby when detecting the overtension at lifting/voltage reducing chopper circuit two ends, can also cut the energy consumption circuit so that folded frequently wave suppression device enters power consumption state, electric energy too much on the dc bus is consumed by the energy consumption circuit.
Although the disclosed execution mode of the present invention as above, the execution mode that described content just adopts for the ease of understanding the present invention is not to limit the present invention.Technical staff in any the technical field of the invention; under the prerequisite that does not break away from the disclosed spirit and scope of the present invention; can do any modification and variation in the details that reaches of implementing in form; but scope of patent protection of the present invention still must be as the criterion with the scope that appending claims was defined.
Claims (9)
1. one kind is used for the folded frequently folded frequency wave suppression device of test, comprising:
Support Capacitor (C1), it is connected in parallel on the dc bus two ends, is used for the voltage stabilization on the assurance dc bus;
Lifting/voltage reducing chopper circuit (201), it is connected to described Support Capacitor (C1) two ends, is used for when too low or too high for voltage on the described Support Capacitor (C1) rising or reduces voltage on the described Support Capacitor (C1);
Controller, (202), its input is connected to Support Capacitor, (C1) on, to detect described Support Capacitor, (C1) voltage on, output is connected to described lifting/voltage reducing chopper circuit, (201) control end, (1,2) on, when described voltage surpasses default first threshold, send control signal so that described lifting/voltage reducing chopper circuit, (201) be operated in the buck chopper state, when described voltage is lower than default Second Threshold, send control signal so that described lifting/voltage reducing chopper circuit, (201) be operated in the boost chopper state
It is characterized in that, described lifting/voltage reducing chopper circuit (201) comprises the first and second switch element (T1, T2) and inductance element (L), described the first switch element (T1) is connected on the dc bus two ends with described second switch element (T2), the node of series connection links to each other with an end of described inductance element (L), storage capacitor in parallel (C2) between the negative pole (DC-) of the other end of described inductance element (L) and dc bus.
2. folded frequency wave suppression device as claimed in claim 1, it is characterized in that, the output of described controller (202) is connected respectively to the control end of described the first switch element (T1) and described second switch element (T2) alternately to be in off state or pulse-width modulation PWM state according to described the first switch element of the voltage control that is detected (T1) and described second switch element (T2).
3. folded frequency wave suppression device as claimed in claim 2 is characterized in that, recently controls time that discharges and recharges to described storage capacitor (C2) by the duty of control pulse-width modulation PWM.
4. such as each described folded frequency wave suppression device among the claim 1-3, it is characterized in that, described the first switch element (T1) and second switch element (T2) are the insulated gate bipolar transistor IGBT element.
5. folded frequency wave suppression device as claimed in claim 4, it is characterized in that, the collector electrode of described the first switch element (T1) is connected to the positive pole (DC+) of dc bus, its emitter is connected to the collector electrode of described second switch element (T2), the emitter of described second switch element (T2) is connected to the negative pole (DC-) of dc bus, one end of described inductance element (L) is connected to the junction of described the first switch element (T1) and described second switch element (T2), the other end connects an end of described storage capacitor (C2), and the other end of described storage capacitor (C2) connects the negative pole (DC-) of dc bus.
6. folded frequency wave suppression device as claimed in claim 5, it is characterized in that, be connected in parallel to energy consumption circuit (203) at described storage capacitor (C2), its control end (3) links to each other with the output of described controller (202), starts described energy consumption circuit (203) work when described controller (202) detects overtension on the described storage capacitor (C2).
7. folded frequency wave suppression device as claimed in claim 6 is characterized in that, described energy consumption circuit (203) comprises switch element (T3) and the resistive element (R) that is connected in series.
8. such as each described folded frequency wave suppression device among the claim 1-7, it is characterized in that, described controller (202) also detects the charging and discharging currents on the described Support Capacitor (C1).
9. a folded frequency that is used for folded frequently test presses down wave method, it is characterized in that, said method comprising the steps of:
Magnitude of voltage on S401, the detection dc bus and the electric current that flows through Support Capacitor (C1);
S402, compare with predefined first threshold and Second Threshold, if described magnitude of voltage is higher than described first threshold, then send control signal so that circuit working at the buck chopper state, thereby dc bus is charged to parallel connection electric capacity thereon,
When if the described magnitude of voltage of S403 is lower than described Second Threshold, then send control signal so that circuit working at the boost chopper state, thereby make the electric capacity that is connected in parallel on the dc bus with electric energy feedback to dc bus;
Wherein, by the duty ratio of setup control signal periodically, can control described circuit to the time of described capacitor charging or with the time of electric energy feedback to dc bus.
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| CN103401499A (en) * | 2013-07-31 | 2013-11-20 | 天津大学 | Disc-type coreless permanent-magnet synchronous motor controller based on current inverter and method |
| CN106026830A (en) * | 2016-05-18 | 2016-10-12 | 南京航空航天大学 | Drive system for stator coreless permanent magnet synchronous motor and control method of drive system |
| CN111327231A (en) * | 2020-02-26 | 2020-06-23 | 致瞻科技(上海)有限公司 | Motor brake feedback energy absorption method, device and system based on high-frequency injection |
| CN112983823A (en) * | 2021-03-15 | 2021-06-18 | 珠海格力节能环保制冷技术研究中心有限公司 | Drive control device, compressor, and control method for compressor |
| CN116545291A (en) * | 2023-04-24 | 2023-08-04 | 无锡凌博电子技术股份有限公司 | Boosting controller of electric vehicle |
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| CN116545291A (en) * | 2023-04-24 | 2023-08-04 | 无锡凌博电子技术股份有限公司 | Boosting controller of electric vehicle |
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