CN102916627B - Variable frequency starting method and device and storage battery supply - Google Patents
Variable frequency starting method and device and storage battery supply Download PDFInfo
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- CN102916627B CN102916627B CN201210401759.1A CN201210401759A CN102916627B CN 102916627 B CN102916627 B CN 102916627B CN 201210401759 A CN201210401759 A CN 201210401759A CN 102916627 B CN102916627 B CN 102916627B
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Abstract
The invention relates to a variable frequency starting method and device and a storage battery supply. When a load is started to produce huge starting current, due to adoption of a mode of respectively setting the output voltage and the output frequency of a boosting inversion circuit into the voltage and frequency meeting the lowest load starting requirement, the load current rises slowly and slightly till reaching the rated voltage and the rated frequency when the load stably operates, and the increasing range of the load current in the starting process is limited to not exceed a safety range so as to protect a power device in a circuit. Because the onset voltage just can meet the starting requirement of the load and is far lower than the steady-stage voltage when the load operates, the load current in the starting process can be reduced under the condition of certain load resistivity; and the onset frequency calculated according to the onset voltage is also lower, the relative motion between a motor stator and a motor rotor of the load is in slow rise from sharp rise, the output power of the motor is reduced, the load current is reduced immediately, and therefore the purpose of limiting the huge starting current from two aspects is achieved.
Description
Technical field
The present invention relates to a kind of clean energy resource method of supplying power to and system, be specifically related to a kind of variable frequency starting method, static frequency converter and battery feed.
Background technology
Current remote mountain areas or generating electricity without electric family use control integrated machine for reverse conversion of pastoral area meet electricity consumption needs, as wind control integrated machine for reverse conversion or photovoltaic control integrated machine for reverse conversion etc.The electrical power storage sent by control integrated machine for reverse conversion is in storage battery, and the direct current that storage battery exports converts to after alternating current, to electric power supply through inverter.When the motor even load of current refrigerator and the compressor of air-conditioning, microwave oven is started by inactive state, the impact of the driven compressor coil of stiction and refrigerator be overcome.Start in a flash in load, because between motor stator and rotor, the speed of relative motion is almost 0, namely there is no the motion of cutting magnetic field, back electromotive force would not be produced in circuit; When the output voltage of storage battery is constant, ignore the effect of self-induction of loop, nearly all output voltage has all been added on the resistance of circuit, and therefore starting current is very large, is 7 ~ 8 times of normal operating current.
As shown in Figure 1; if storage battery still exports according to steady state voltage 1 and steady frequency 2 load; the super large starting current that load current 3 will form nominal load current 7 ~ 8 times causes the inverter startup overcurrent protection be connected with storage battery; cause that the output voltage of storage battery is instantaneous to be fallen; cause again inverter startup low-voltage variation, the overcurrent protection of frequent starting and low-voltage variation finally cause the availability of whole electric power system to reduce.
In prior art, the method for limiting of super large starting current is mainly comprised: 1, thermistor method, if application for a patent for invention-transient current buffering suppresser (publication number: CN101335451) is exactly by series thermal-sensitive resistance in circuit, if have larger super large starting current to produce in load by the static moment to starting, super large starting current can be limited within rated range by thermistor; But the shortcoming of thermistor method is, during startup, thermistor needs certain hour could arrive operating state resistance value, during closedown, thermistor also needs certain cooling time and resistance is elevated to normal-temperature in order to starting next time, if motor opens after cutting out so at once, thermistor does not also turn cold, and this just loses restriction to super large starting current.
2, Industrial Frequency Transformer method, at control integrated machine for reverse conversion and a power frequency electric depressor of connecting between electrical appliance, when the compressor in circuit, electric motor starting produce super large starting current, Industrial Frequency Transformer makes output voltage decline, but output frequency remains unchanged.Although reduce to some extent relative to super large starting current when steady state voltage, do not change the speed of motor load, thus super large starting current is still larger.
Summary of the invention
The present invention is directed to the deficiencies in the prior art; propose a kind of super large starting current that can effectively suppress load to be produced by the static moment to starting; protection power source and power device; avoid the overcurrent protection of frequent starting and the variable frequency starting method of low-voltage variation; according to the static frequency converter that the method builds, and use the battery feed of this static frequency converter.
Technical scheme of the present invention is as follows:
A kind of variable frequency starting method, its step comprises:
1) boost inverter circuit is set at the output of storage battery;
2) load current of described boost inverter circuit output is detected, and by detection signal input signal processor, as the adjustment output voltage of described boost inverter circuit and the feedback key element of output frequency;
3) when detecting that load starts, given voltage is set to the take-off voltage of described load by described signal processor, and calculates given frequency corresponding to described given voltage and command signal in real time; Drive described boost inverter circuit according to described command signal, make described boost inverter circuit export with the output voltage of described given change in voltage and output frequency;
4) according to the linear relationship preset, given voltage described in lifting gradually, and calculate given frequency corresponding to described given voltage and command signal in real time;
5) when described given voltage reaches the steady state voltage scope of described load, described given voltage is remained the rated voltage of described load, and calculate given frequency corresponding to described given voltage and command signal in real time.
Described command signal comprises the duty ratio for driving power device.
Described boost inverter circuit comprises boosting full-bridge and inverter bridge, and described command signal inputs in the power device of described boosting full-bridge and inverter bridge.
Described signal processor also detects the output voltage of the input voltage of described boost inverter circuit input and input current, described boost inverter circuit output, carry out FEEDBACK CONTROL to described boost inverter circuit afterwards, output voltage and output frequency in order to ensure described boost inverter circuit meet the needs that described load normally runs.
A kind of static frequency converter, is characterized in that: it comprises signal processor, signal acquisition module and drive circuit, wherein said signal acquisition module detects the load current of output circuit, and detection signal is inputted described signal processor; Described signal processor arranges given voltage according to described load current, calculates given frequency and command signal afterwards, and described command signal is inputted described drive circuit according to described given voltage; Described drive circuit, according to the power device in described command signal driver output circuit, makes output voltage and the output frequency of the output of described output circuit and described given voltage and given frequency match;
When described load starts, described output voltage and output frequency slowly raise, until described output voltage maintains the rated voltage of described load.
The method to set up of described signal processor to described given voltage comprises:
A) detection signal described signal acquisition module inputted is as the adjustment output voltage of described boost inverter circuit and the feedback key element of output frequency;
B) when detecting that described load starts, described given voltage is set to the take-off voltage of described load, and calculates given frequency corresponding to described given voltage and command signal in real time;
C) according to the linear relationship preset, given voltage described in lifting gradually, and calculate given frequency corresponding to described given voltage and command signal in real time;
D) when described given voltage reaches the steady state voltage scope of described load, determine described the rated voltage that voltage remains described load, and calculate given frequency corresponding to described given voltage and command signal in real time.
Described signal processor is digital signal processor or application-specific integrated circuit (ASIC).
Use a battery feed for above-mentioned static frequency converter, it is characterized in that: it also comprises storage battery, the boost inverter circuit of series connection, described boost inverter circuit comprises the boosting full-bridge, high frequency transformation bridge, rectifier bridge and the inverter bridge that connect successively; The drive circuit of described static frequency converter drives the power device in described boosting full-bridge and inverter bridge, the signal acquisition module of described static frequency converter to gather the voltage and current signal of described boost inverter circuit input and output.
The output of described inverter bridge connects a filter circuit, and described signal acquisition module gathers the voltage and current signal of described filter circuit output.
Described power device comprises CMOS tube and/or IGBT pipe.
Technique effect of the present invention is as follows:
Impact resistance current control process of the present invention is when load starts generation super large starting current; the voltage of minimum requirements and the mode of frequency is started by the output voltage of boost inverter circuit and output frequency being all set to meet load; load current is made slowly, slightly to increase; until rated voltage when reaching load even running and rated frequency; the amplification of load current when restriction starts makes it to exceed safe range, the power device in protective circuit.
Because take-off voltage can only meet the startup needs of load, and take-off voltage is much lower compared to steady state voltage during load running, can reduce load current during startup when load resistance is certain; And the take-off frequency calculated by take-off voltage is also lower, relative motion between the motor stator of load and rotor becomes slow rising from rising rapidly, the power output of motor reduces, and known load current reduces immediately, reaches the object of restriction super large starting current like this from two aspects.
Owing to being that signal processor by having digital processing function to be realize by the duty ratio of adjustment for driving power device to the adjustment of output voltage and output frequency, thus have response rapidly, the feature of good, the protection power device of restriction effect.
Static frequency converter of the present invention is arranged owing to adopting said method, compared to existing thermistor method, has and can carry out the advantage of effectively restriction by the super large starting current that produces of, the load that repeatedly starts short to interval start-up time.Compared to existing Industrial Frequency Transformer method, due to the default transformer equipment of bulky, the volume of whole adjuster is obviously compressed, and response speed is rapider.
Accompanying drawing explanation
Fig. 1 is that load is by the static view to output voltage, output frequency and load current when starting
Fig. 2 is apparatus structure schematic diagram of the present invention
Fig. 3 is through the view of output voltage, output frequency and load current during the generation impact electric current after method and apparatus of the present invention adjustment
Fig. 4 is the output voltage of refrigerator when normally working and load current waveform
Fig. 5 does not change given voltage U when being refrigerator startup
refwith given frequency f
ref, output voltage and load current waveform
Fig. 6 changes given voltage U when being refrigerator startup
refwith given frequency f
ref, output voltage and load current waveform
Embodiment
Below in conjunction with accompanying drawing, the present invention will be described.
In order to make object of the present invention, technical scheme and advantage clearly understand, below in conjunction with drawings and Examples, the present invention is further elaborated.Specific embodiment described herein only in order to explain the present invention, is not intended to limit the present invention.
As shown in Figure 2, static frequency converter 4 of the present invention comprises signal processor 5, signal acquisition module 6 and drive circuit 7, the output of the input connection signal acquisition module 6 of signal processor 5, exports and connects the input of one drive circuit 7 and the input of another drive circuit 7 respectively; Wherein signal processor 5 can be Digital Signal Processing (DSP) or application-specific integrated circuit (ASIC) (ASIC) etc.Battery feed comprises static frequency converter 4, storage battery 8, boost inverter circuit, load port 10, and storage battery 8, boost inverter circuit, load port 10 connect successively; Boost inverter circuit comprises the boosting full-bridge 91, high frequency transformation bridge 92, rectifier bridge 93, inverter bridge 94 and the filter circuit 95 that connect successively.The output of one drive circuit 7 drives the power device in boosting full-bridge 91, and the output of another drive circuit 7 drives the power device in inverter bridge 94, and power device comprises CMOS tube, IGBT pipe etc.Signal acquisition module 6 gathers the voltage and current signal of the voltage and current signal of storage battery 8 output, the busbar voltage between rectifier bridge 93 and inverter bridge 94 and current signal, filter circuit 95 output respectively.
The voltage and current signal input signal processor 5 collected judges by signal acquisition module 6, judge inactive state and the starting state of load on the one hand, limited the super large starting current produced when load starts by the mode slowly increasing output voltage and output frequency; Judge on the other hand whether whether the output voltage of storage battery 8 reaches the rated output voltage of storage battery 8, whether the DC bus current between rectifier bridge 93 and inverter bridge 94 reaches rated direct current, filter circuit 95 exports output voltage reaches the rated output voltage of whole battery feed, is ensured the normal operation of battery feed by the mode of FEEDBACK CONTROL.
As the output voltage U that signal acquisition module 6 gathers at filter circuit 95 place
outlower than the minimum voltage U of load running
min, or when load is started by inactive state.Signal processor 5 sets corresponding given voltage U
ref, then according to current given voltage U
refcalculate current given frequency f
ref, f
ref=kU
ref+ b, wherein k, b are constant.Duty ratio in signal processor 5 regulating command signal makes it and current given voltage U
refcorrespondence, drive circuit 7 drives the power device of boosting full-bridge 91 and inverter bridge 94 according to duty ratio, realizes the output voltage U to boost inverter circuit
outwith output frequency f
outadjustment, f
out=k*U
out+ b, wherein k, b are constant.Make output voltage U
outwith output frequency f
outalong with given voltage U
refwith given frequency f
refchange and change, finally reaching output voltage U
out=given voltage U
ref, output frequency f
out=given frequency f
ref.
As from the foregoing, when load is just started by inactive state, when between motor stator and rotor, the speed of relative motion is almost 0, signal processor 5 is by given voltage U
refbe set to the take-off voltage U of load
trip, and according to take-off voltage U
tripcalculate take-off frequency f
trip.Due to take-off voltage U
tripthe startup needs of load can only be met, and take-off voltage U
tripcompared to rated voltage U
rvmuch lower, load current I during startup can be reduced when load resistance is certain
rlC; And by take-off voltage U
tripthe take-off frequency f calculated
tripalso lower, make the output frequency f of boost inverter circuit 9
outalso lower, the relative motion between the motor stator of load and rotor becomes slow rising from rising rapidly, and reduce when making stiction compare rated frequency, the output frequency P of motor reduces, by P=I
rlc 2the known load current I of R
rlcreduce immediately.The effect super large starting current stacked up when load can be started of above two aspects drops to specified 2 ~ 3 times, and the impact that storage battery 8 is subject to also can reduce.
As shown in Figure 3, based on above-mentioned principle, the modulator approach of signal processor 5 comprises:
1) signal acquisition module 6 detects the load current I of a certain moment boost inverter circuit 9 output
rlc, and judge in this detection signal input signal processor 5;
2) when signal processor 5 detects that load starts, signal processor 5 is by given voltage U
refbe set to the take-off voltage U of load
trip, and calculate given voltage U in real time
refcorresponding given frequency f
refand command signal, given frequency f
ref=take-off frequency f
trip; Drive boost inverter circuit 9 according to command signal, boost inverter circuit 9 is exported with given voltage U
refwith given frequency f
refthe output voltage U of change
outwith output frequency f
out; As output voltage U
outwith output frequency f
outwhen all reducing, load current I when load starts
rlcdecrease;
3) according to the linear relationship preset, the given voltage U of lifting gradually
ref, and calculate given voltage U in real time
refcorresponding given frequency f
refand command signal; As seen from Figure 3, start the super large starting current produced obviously to be dragged down;
5) when given voltage U
refreach the steady state voltage scope of load, by given voltage U
refremain the rated voltage U of load
rv, and calculate given voltage U in real time
refcorresponding given frequency f
refand command signal, now given frequency f
ref=rated frequency f
rv.
Here be above-mentioned variable frequency starting method and device for during without electric family electric power system, the present invention is relative to the remarkable result of prior art, and circuit parameter is in table 1.
Table 1
| Sequence number | Circuit name | Device name | Specifications and models |
| 1 | 5 | Signal processor | Digital signal processor (DSP) |
| 2 | 6 | Signal acquisition module | Signal acquisition module based on operational amplifier |
| 3 | 7 | Drive circuit | Drive circuit based on isolating device |
| 4 | 8 | Storage battery | 24V/200Ah |
| 5 | 91 | Boosting bridge | Power device is metal-oxide-semiconductor |
| 6 | 92 | High frequency transformer | General high frequency transformer |
| 7 | 93 | Rectifier bridge | Power device is fast recovery diode |
| 8 | 94 | Inverter bridge | Power device is IGBT |
| 9 | 95 | Filter circuit | The combination of inductance and electric capacity |
| 10 | 10 | Load port | Drive model is the refrigerator load of BC-50EN |
As shown in Figure 4, when refrigerator normally works, yellow curve represents boost inverter circuit ac output voltage U
out, green curve represents boost inverter circuit AC load electric current I
rlc.The normal working voltage of refrigerator ensures that, at 227V, running current ensures at 0.584A.
As shown in Figure 5, produce super large starting current in circuit when refrigerator starts moment, do not changing given voltage U
refwith given frequency f
refwhen, yellow curve represents boost inverter circuit ac output voltage U
out, green curve represents boost inverter circuit AC load electric current I
rlc.The starting resistor of refrigerator ensures at 219V, and starting the super large starting current produced instantaneously is 7.63A, is 13.1 times of running current.
As shown in Figure 6, produce super large starting current in circuit when refrigerator starts moment, after method and apparatus adjustment of the present invention, in the given voltage U of change
refwith given frequency f
refwhen, yellow curve represents boost inverter circuit ac output voltage U
out, green curve represents boost inverter circuit AC load electric current I
rlc.As seen from the figure, output voltage U
outbe reduced to 116V, output frequency f
outdrop to 21.55Hz.Starting super large starting current instantaneously at refrigerator is 2.87A, is equivalent to do not changing given voltage U
refwith given frequency f
ref37.6% of Shi Chao great starting current, therefore effectively limit refrigerator and starts the super large starting current produced instantaneously.
It should be pointed out that the above embodiment can make the invention of those skilled in the art's comprehend, but do not limit the present invention in any way creation.Therefore; although this specification has been described in detail the invention with reference to drawings and Examples; but; those skilled in the art are to be understood that; still can modify to the invention or equivalent replacement; in a word, all do not depart from technical scheme and the improvement thereof of the spirit and scope of the invention, and it all should be encompassed in the middle of the protection range of the invention patent.
Claims (9)
1. a variable frequency starting method, its step comprises:
1) boost inverter circuit is set at the output of storage battery;
2) load current of described boost inverter circuit output is detected, and by detection signal input signal processor, as the adjustment output voltage of described boost inverter circuit and the feedback key element of output frequency;
Described signal processor also detects the output voltage of the input voltage of described boost inverter circuit input and input current, described boost inverter circuit output, carry out FEEDBACK CONTROL to described boost inverter circuit afterwards, output voltage and output frequency in order to ensure described boost inverter circuit meet the needs that load normally runs;
3) when detecting that described load starts, given voltage is set to the take-off voltage of described load by described signal processor, and calculates given frequency corresponding to described given voltage and command signal in real time; Drive described boost inverter circuit according to described command signal, make described boost inverter circuit export with the output voltage of described given change in voltage and output frequency;
4) according to the linear relationship preset, given voltage described in lifting gradually, and calculate given frequency corresponding to described given voltage and command signal in real time;
5) when described given voltage reaches the steady state voltage scope of described load, described given voltage is remained the rated voltage of described load, and calculate given frequency corresponding to described given voltage and command signal in real time.
2. a kind of variable frequency starting method as claimed in claim 1, is characterized in that: described command signal comprises the duty ratio for driving power device.
3. a kind of variable frequency starting method as claimed in claim 2, is characterized in that: described boost inverter circuit comprises boosting full-bridge and inverter bridge, and described command signal inputs in the power device of described boosting full-bridge and inverter bridge.
4. a static frequency converter, it is characterized in that: it comprises signal processor, signal acquisition module and drive circuit, wherein said signal acquisition module detects the input voltage of input and the load current of input current and output circuit and output voltage, and detection signal is inputted described signal processor; Described signal processor arranges given voltage according to described detection signal, calculates given frequency and command signal afterwards, and described command signal is inputted described drive circuit according to described given voltage; Described drive circuit, according to the power device in described command signal driver output circuit, makes output voltage and the output frequency of the output of described output circuit and described given voltage and given frequency match;
When load starts, described output voltage and output frequency slowly raise, until described output voltage maintains the rated voltage of described load.
5. a kind of static frequency converter as claimed in claim 4, is characterized in that: the method to set up of described signal processor to described given voltage comprises:
A) detection signal described signal acquisition module inputted is as the adjustment output voltage of boost inverter circuit and the feedback key element of output frequency;
B) when detecting that described load starts, described given voltage is set to the take-off voltage of described load, and calculates given frequency corresponding to described given voltage and command signal in real time;
C) according to the linear relationship preset, given voltage described in lifting gradually, and calculate given frequency corresponding to described given voltage and command signal in real time;
D) when described given voltage reaches the steady state voltage scope of described load, determine described the rated voltage that voltage remains described load, and calculate given frequency corresponding to described given voltage and command signal in real time.
6. a kind of static frequency converter as described in claim 4 or 5, is characterized in that: described signal processor is digital signal processor or application-specific integrated circuit (ASIC).
7. one kind uses the battery feed of the static frequency converter as described in one of claim 4 ~ 6, it is characterized in that: it also comprises storage battery, the boost inverter circuit of series connection, described boost inverter circuit comprises the boosting full-bridge, high frequency transformation bridge, rectifier bridge and the inverter bridge that connect successively; The drive circuit of described static frequency converter drives the power device in described boosting full-bridge and inverter bridge, the signal acquisition module of described static frequency converter to gather the voltage and current signal of described boost inverter circuit input and output.
8. a kind of battery feed as claimed in claim 7, is characterized in that: the output of described inverter bridge connects a filter circuit, and described signal acquisition module gathers the voltage and current signal of described filter circuit output.
9. a kind of battery feed as claimed in claim 7 or 8, is characterized in that: described power device comprises CMOS tube and/or IGBT pipe.
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|---|---|---|---|
| CN201210401759.1A CN102916627B (en) | 2012-10-19 | 2012-10-19 | Variable frequency starting method and device and storage battery supply |
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| CN201210401759.1A CN102916627B (en) | 2012-10-19 | 2012-10-19 | Variable frequency starting method and device and storage battery supply |
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| CN102916627B true CN102916627B (en) | 2015-06-24 |
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| CN103516291A (en) * | 2013-09-25 | 2014-01-15 | 无锡阿比利德电力科技有限公司 | Motor power frequency/frequency conversion automatic switching device |
| CN104660023A (en) * | 2015-03-03 | 2015-05-27 | 阳光电源股份有限公司 | Direct current bus discharge method and device for fan converter |
| CN106379132A (en) * | 2016-09-18 | 2017-02-08 | 深圳市汇川技术股份有限公司 | On-load starting system and method for low-voltage direct current power supply |
| CN108011546B (en) * | 2017-12-05 | 2020-10-13 | 宁波乐邦电气有限公司 | Super-start frequency conversion control method for loom |
| CN112600464B (en) * | 2020-12-21 | 2022-07-15 | 格力电器（武汉）有限公司 | Starting method and device of frequency converter, storage medium and electronic device |
| CN114244096B (en) * | 2021-12-31 | 2023-03-24 | 深圳市驰普科达科技有限公司 | Outdoor power supply device starting control method, controller and outdoor power supply device |
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| WO2004025819A1 (en) * | 2002-09-13 | 2004-03-25 | Fuji Electric Fa Components & Systems Co., Ltd. | Control method of induction motor |
| CN101728957B (en) * | 2009-11-24 | 2011-09-28 | 华东交通大学 | Method for reducing no-load loss of inverter with two-stage structure |
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