CN102916627A - 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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- CN102916627A CN102916627A CN2012104017591A CN201210401759A CN102916627A CN 102916627 A CN102916627 A CN 102916627A CN 2012104017591 A CN2012104017591 A CN 2012104017591A CN 201210401759 A CN201210401759 A CN 201210401759A CN 102916627 A CN102916627 A CN 102916627A
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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 pastoral area generate electricity to satisfy the electricity consumption needs without electric family with the control integrated machine for reverse conversion, such as wind control integrated machine for reverse conversion or photovoltaic control integrated machine for reverse conversion etc.With the electrical power storage sent of control integrated machine for reverse conversion in storage battery, after the direct current of storage battery output converts alternating current to through inverter, to electric power supply.When the motor even load of present refrigerator and the compressor of air-conditioning, microwave oven is started by inactive state, overcome the impact of the driven compressor coil of stiction and refrigerator.Start in a flash in load, because the speed of relative motion is almost 0 between motor stator and the rotor, namely do not have the motion of cutting magnetic field, just can in circuit, not produce back electromotive force; When the output voltage of storage battery is constant, ignore the effect of self-induction of loop, nearly all output voltage all has been added on the resistance of circuit, so starting current is very large, is 7～8 times of normal running current.
As shown in Figure 1; if storage battery is still exported according to steady state voltage 1 and steady frequency 2 load; the super large starting current that load current 3 will form 7～8 times of nominal load current causes the inverter startup overcurrent protection that is connected with storage battery; cause instantaneous the falling of output voltage of storage battery; cause again the 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 the prior art method for limiting of super large starting current mainly comprised: 1, thermistor method, such as application for a patent for invention-transient current buffering suppresser (publication number: be exactly by series thermal-sensitive resistance in circuit CN101335451), if have larger super large starting current to produce in load by static moment to starting, thermistor can be with the super large inrush current limitation within rated range; But the shortcoming of thermistor method is, thermistor needs certain hour could arrive the operating state resistance value during startup, thermistor also needs certain cooling time that resistance is elevated to normal-temperature in order to start next time when closing, if motor cuts out rear horse back unlatching like this, thermistor does not also turn cold, and this has just lost restriction to the super large starting current.
2, Industrial Frequency Transformer method, the power-frequency voltage device of between control integrated machine for reverse conversion and electrical appliance, connect, when the compressor in the circuit, when electric motor starting produces the super large starting current, Industrial Frequency Transformer makes output voltage decline, but output frequency remains unchanged.Although reduce to some extent with respect to the super large starting current in the situation of steady state voltage, do not change the speed of motor load, thereby the super large starting current is still larger.
Summary of the invention
The present invention is directed to the deficiencies in the prior art; the super large starting current that the load of a kind of energy establishment was produced by static moment to starting has been proposed; 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 of the method structure, and the battery feed that uses this static frequency converter.
Technical scheme of the present invention is as follows:
A kind of variable frequency starting method, its step comprises:
1) output at storage battery arranges boost inverter circuit;
2) load current of the described boost inverter circuit output of detection, and with in the detection signal input signal processor, as the output voltage of adjusting described boost inverter circuit and the feedback key element of output frequency;
3) when detecting the load startup, the given voltage of described signal processor is set to the take-off voltage of described load, and calculates in real time described given voltage corresponding given frequency and command signal; Drive described boost inverter circuit according to described command signal, make described boost inverter circuit output with output voltage and the output frequency of described given change in voltage;
4) according to default linear relationship, the described given voltage of lifting gradually, and calculate in real time described given voltage corresponding given frequency and command signal;
5) reach the steady state voltage scope of described load when described given voltage, described given voltage is remained the rated voltage of described load, and calculate in real time described given voltage corresponding given frequency and command signal.
Described control signal comprises the duty ratio for the driving power device.
Described boost inverter circuit comprises boost full-bridge and inverter bridge, in the power device of described command signal input described boost 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, afterwards described boost inverter circuit is carried out FEEDBACK CONTROL, satisfy the normal needs that move of described load in order to output voltage and the output frequency that guarantees described boost inverter circuit.
A kind of static frequency converter is characterized in that: it comprises signal processor, signal acquisition module and drive circuit, and 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 according to described given voltage afterwards, and described command signal is inputted described drive circuit; Described drive circuit makes output voltage and the output frequency of described output circuit output and described given voltage and given frequency match according to the power device in the described command signal driver output circuit;
When described load started, described output voltage and output frequency slowly raise, until described output voltage maintains the rated voltage of described load.
Described signal processor comprises the method to set up of described given voltage:
A) detection signal of described signal acquisition module being inputted is as the output voltage of adjusting described boost inverter circuit and the feedback key element of output frequency;
B) when detecting described load startup, described given voltage is set to the take-off voltage of described load, and calculates in real time described given voltage corresponding given frequency and command signal;
C) according to default linear relationship, the described given voltage of lifting gradually, and calculate in real time described given voltage corresponding given frequency and command signal;
D) reach the steady state voltage scope of described load when described given voltage, decide the rated voltage that voltage remains described load with described, and calculate in real time described given voltage corresponding given frequency and command signal.
Described signal processor is digital signal processor or application-specific integrated circuit (ASIC).
A kind of battery feed that uses above-mentioned static frequency converter is characterized in that: it also comprises storage battery, the boost inverter circuit of series connection, and described boost inverter circuit comprises the full-bridge that boosts, high frequency transformation bridge, rectifier bridge and the inverter bridge that connects successively; The drive circuit of described static frequency converter drives the power device in described boost full-bridge and the inverter bridge, and the signal acquisition module of described static frequency converter gathers 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 pipe and/or IGBT pipe.
Technique effect of the present invention is as follows:
When impact resistance current control process of the present invention starts generation super large starting current in load; all be set to satisfy the voltage of load startup minimum requirements and the mode of frequency by output voltage and output frequency with boost inverter circuit; make slow, the slightly rising of load current; until rated voltage and rated frequency when reaching the load even running; the amplification of the load current when restriction starts makes it can not surpass safe range, the power device in the protective circuit.
Because take-off voltage can only satisfy the startup needs of load, and the steady state voltage of take-off voltage during than load running is much lower, can reduce the load current when starting in the certain situation of load resistance; And the take-off frequency of being calculated by take-off voltage is also lower, the motor stator of load and the relative motion between the rotor become rising by rising rapidly, the power output of motor reduces, and load current reduces immediately as can be known, reaches like this purpose of restriction super large starting current from two aspects.
Owing to the adjustment to output voltage and output frequency is recently to realize by adjusting the duty that is used for the driving power device by the signal processor with digital processing function, thereby have the advantages that response is rapid, restriction effect is good, protect power device.
Static frequency converter of the present invention than existing thermistor method, has the advantage that can effectively limit the super large starting current that the load short, that repeatedly start of interval start-up time produces owing to adopt the said method setting.Than existing Industrial Frequency Transformer method, because the default transformer equipment of bulky the volume of whole adjuster is obviously compressed, and response speed is rapider.
Description of drawings
Fig. 1 is load by the view of static output voltage, output frequency and load current when starting
Fig. 2 is apparatus structure schematic diagram of the present invention
The view of output voltage, output frequency and load current when Fig. 3 is generation impact electric current after adjusting through method and apparatus of the present invention
Output voltage and load current waveform when Fig. 4 is the refrigerator normal operation
Fig. 5 does not change given voltage U when being the refrigerator startup
RefWith given frequency f
Ref, output voltage and load current waveform
Fig. 6 changes given voltage U when being the refrigerator startup
RefWith given frequency f
Ref, output voltage and load current waveform
Embodiment
The present invention will be described below in conjunction with accompanying drawing.
In order to make purpose of the present invention, technical scheme and advantage clearer, 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 1, static frequency converter 4 of the present invention comprises signal processor 5, signal acquisition module 6 and drive circuit 7, the input of signal processor 5 connects the output of signal acquisition module 6, and output connects respectively the input of one drive circuit 7 and the input of another drive circuit 7; 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; Comprise the full-bridge 91 that boosts, high frequency transformation bridge 92, rectifier bridge 93, inverter bridge 94 and the filter circuit 95 that connect successively in the boost inverter circuit.The output of one drive circuit 7 drives the power device in the full-bridge 91 that boosts, and the output of another drive circuit 7 drives the power device in the inverter bridge 94, and power device comprises CMOS pipe, IGBT pipe etc.Signal acquisition module 6 gathers respectively the voltage and current signal of busbar voltage between voltage and current signal, rectifier bridge 93 and the inverter bridge 94 of storage battery 8 outputs and current signal, filter circuit 95 outputs.
Signal acquisition module 6 is judged the voltage and current signal input signal processor 5 that collects, judge on the one hand inactive state and the starting state of load, the mode by slow increase output voltage and output frequency limits the super large starting current that produces when load starts; Judge on the other hand whether the output voltage of storage battery 8 reaches the output voltage whether dc bus current between the rated output voltage of storage battery 8, rectifier bridge 93 and the inverter bridge 94 reach rated direct current, filter circuit 95 outputs and whether reach the rated output voltage of whole battery feed, guarantees the normal operation of battery feed by the mode of FEEDBACK CONTROL.
When the output voltage U of signal acquisition module 6 in the collection of filter circuit 95 places
OutBe lower than the minimum voltage U of load running
Min, or load is when being started by inactive state.Signal processor 5 is set corresponding given voltage U
Ref, again 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 the signal processor 5 regulating command signals makes it and current given voltage U
RefCorrespondence, drive circuit 7 drives the power device of boost 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 reach 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, the speed of relative motion was almost 0 o'clock between motor stator and the rotor, and signal processor 5 is with given voltage U
RefBe set to the take-off voltage U of load
Trip, and according to the take-off voltage U
TripCalculate the take-off frequency f
TripBecause take-off voltage U
TripCan only satisfy the startup needs of load, and the take-off voltage U
TripThan rated voltage U
RvMuch lower, in the certain situation of load resistance, can reduce the load current I when starting
RlCAnd by the take-off voltage U
TripThe take-off frequency f of calculating
TripAlso lower, so that the output frequency f of boost inverter circuit 9
OutAlso lower, the motor stator of load and the relative motion between the rotor become rising by rising rapidly, so that stiction reduces when comparing rated frequency, the output frequency P of motor reduces, by P=I
Rlc 2R is load current I as can be known
RlcReduce immediately.More than the super large starting current that stacks up in the time of load can being started of the effect of two aspects drop to specified 2～3 times, 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 outputs
Rlc, and will judge in this detection signal input signal processor 5;
2) when signal processor 5 detected the load startup, signal processor 5 was with given voltage U
RefBe set to the take-off voltage U of load
Trip, and calculate in real time given voltage U
RefCorresponding given frequency f
RefAnd command signal, given frequency f
Ref=take-off frequency f
TripDrive boost inverter circuit 9 according to command signal, make boost inverter circuit 9 outputs with given voltage U
RefWith given frequency f
RefThe output voltage U that changes
OutWith output frequency f
OutWork as output voltage U
OutWith output frequency f
OutWhen all reducing, the load current I when load starts
RlcDecrease;
3) according to default linear relationship, the gradually given voltage U of lifting
Ref, and calculate in real time given voltage U
RefCorresponding given frequency f
RefAnd command signal; As seen from Figure 3, starting the super large starting current that produces is obviously dragged down;
5) when given voltage U
RefReach the steady state voltage scope of load, with given voltage U
RefRemain the rated voltage U of load
Rv, and calculate in real time given voltage U
RefCorresponding given frequency f
RefAnd command signal, at this moment given frequency f
Ref=rated frequency f
Rv
The below is above-mentioned variable frequency starting method and installs when being used for without electric family electric power system that the present invention is with respect to the remarkable result of prior art, and circuit parameter sees Table 1.
Table 1
| Sequence number | Circuit name | Device name | Specifications and |
| 1 | 5 | Signal processor | Digital signal processor (DSP) |
| 2 | 6 | Signal acquisition module | Take operational amplifier as main |
| 3 | 7 | Drive circuit | Take isolating device as |
| 4 | 8 | Storage battery | 24V/200Ah |
| 5 | 91 | Bridge boosts | Power device is metal-oxide-semiconductor |
| 6 | 92 | High frequency transformer | General high frequency transformer |
| 7 | 93 | Rectifier bridge | Power device is |
| 8 | 94 | Inverter bridge | Power device is IGBT |
| 9 | 95 | Filter circuit | The combination of inductance and |
| 10 | 10 | Load port | Driving model is the refrigerator load of BC-50EN |
As shown in Figure 4, when refrigerator worked, yellow curve represented boost inverter circuit ac output voltage U
Out, green curve represents boost inverter circuit AC load electric current I
RlcThe normal working voltage of refrigerator guarantees that at 227V, running current guarantees at 0.584A.
As shown in Figure 5, in circuit, produce the super large starting current when refrigerator starts moment, do not changing given voltage U
RefWith given frequency f
RefSituation under, yellow curve represents boost inverter circuit ac output voltage U
Out, green curve represents boost inverter circuit AC load electric current I
RlcThe starting resistor of refrigerator guarantees that at 219V the super large starting current that starts the moment generation is 7.63A, is 13.1 times of running current.
As shown in Figure 6, in circuit, produce the super large starting current when refrigerator starts moment, after adjusting through method and apparatus of the present invention, changing given voltage U
RefWith given frequency f
RefSituation under, yellow curve represents boost inverter circuit ac output voltage U
Out, green curve represents boost inverter circuit AC load electric current I
RlcAs seen from the figure, output voltage U
OutBe reduced to 116V, output frequency f
OutDrop to 21.55Hz.Starting moment super large starting current at refrigerator is 2.87A, is equivalent to do not changing given voltage U
RefWith given frequency f
RefTherefore 37.6% of Shi Chaoda starting current has effectively limited refrigerator and has started the super large starting current that moment produces.
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 make amendment or be equal to replacement the invention; in a word, all do not break away 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 (10)
1. variable frequency starting method, its step comprises:
1) output at storage battery arranges boost inverter circuit;
2) load current of the described boost inverter circuit output of detection, and with in the detection signal input signal processor, as the output voltage of adjusting described boost inverter circuit and the feedback key element of output frequency;
3) when detecting the load startup, the given voltage of described signal processor is set to the take-off voltage of described load, and calculates in real time described given voltage corresponding given frequency and command signal; Drive described boost inverter circuit according to described command signal, make described boost inverter circuit output with output voltage and the output frequency of described given change in voltage;
4) according to default linear relationship, the described given voltage of lifting gradually, and calculate in real time described given voltage corresponding given frequency and command signal;
5) reach the steady state voltage scope of described load when described given voltage, described given voltage is remained the rated voltage of described load, and calculate in real time described given voltage corresponding given frequency and command signal.
2. a kind of variable frequency starting method as claimed in claim 1, it is characterized in that: described command signal comprises the duty ratio for the driving power device.
3. a kind of variable frequency starting method as claimed in claim 2, it is characterized in that: described boost inverter circuit comprises boost full-bridge and inverter bridge, in the power device of described command signal input described boost full-bridge and inverter bridge.
4. such as claim 1 or 2 or 3 described a kind of variable frequency starting methods, it is characterized in that: 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, afterwards described boost inverter circuit is carried out FEEDBACK CONTROL, satisfy the normal needs that move of described load in order to output voltage and the output frequency that guarantees described boost inverter circuit.
5. 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 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 according to described given voltage afterwards, and described command signal is inputted described drive circuit; Described drive circuit makes output voltage and the output frequency of described output circuit output and described given voltage and given frequency match according to the power device in the described command signal driver output circuit;
When described load started, described output voltage and output frequency slowly raise, until described output voltage maintains the rated voltage of described load.
6. a kind of static frequency converter as claimed in claim 5, it is characterized in that: described signal processor comprises the method to set up of described given voltage:
A) detection signal of described signal acquisition module being inputted is as the output voltage of adjusting described boost inverter circuit and the feedback key element of output frequency;
B) when detecting described load startup, described given voltage is set to the take-off voltage of described load, and calculates in real time described given voltage corresponding given frequency and command signal;
C) according to default linear relationship, the described given voltage of lifting gradually, and calculate in real time described given voltage corresponding given frequency and command signal;
D) reach the steady state voltage scope of described load when described given voltage, decide the rated voltage that voltage remains described load with described, and calculate in real time described given voltage corresponding given frequency and command signal.
7. such as claim 5 or 6 described a kind of static frequency converters, it is characterized in that: described signal processor is digital signal processor or application-specific integrated circuit (ASIC).
8. the battery feed of the described static frequency converter of one of a use such as claim 5～7, it is characterized in that: it also comprises storage battery, the boost inverter circuit of series connection, and described boost inverter circuit comprises the full-bridge that boosts, high frequency transformation bridge, rectifier bridge and the inverter bridge that connects successively; The drive circuit of described static frequency converter drives the power device in described boost full-bridge and the inverter bridge, and the signal acquisition module of described static frequency converter gathers the voltage and current signal of described boost inverter circuit input and output.
9. a kind of battery feed as claimed in claim 8, it 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.
10. a kind of battery feed as claimed in claim 8 or 9, it is characterized in that: described power device comprises CMOS pipe and/or IGBT pipe.
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
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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 |
| CN108011546A (en) * | 2017-12-05 | 2018-05-08 | 宁波乐邦电气有限公司 | A kind of loom surpasses startup method for controlling frequency conversion |
| CN112600464A (en) * | 2020-12-21 | 2021-04-02 | 格力电器（武汉）有限公司 | Starting method and device of frequency converter, storage medium and electronic device |
| CN114244096A (en) * | 2021-12-31 | 2022-03-25 | 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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| CN1679227A (en) * | 2002-09-13 | 2005-10-05 | 富士电机机器制御株式会社 | Control method of induction motor |
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Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| 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 |
| CN108011546A (en) * | 2017-12-05 | 2018-05-08 | 宁波乐邦电气有限公司 | A kind of loom surpasses startup method for controlling frequency conversion |
| 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 |
| CN112600464A (en) * | 2020-12-21 | 2021-04-02 | 格力电器（武汉）有限公司 | Starting method and device of frequency converter, storage medium and electronic device |
| CN114244096A (en) * | 2021-12-31 | 2022-03-25 | 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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Effective date of registration: 20210630 Address after: 101511 room 508-28, Xitiangezhuang town government office building, No.8 Xitong Road, Miyun Economic Development Zone, Beijing Patentee after: Beijing Huayuan Hongsheng Energy Technology Co.,Ltd. Address before: 101500 508-7, Xitiangezhuang town government office building, No.8 Xitong Road, Miyun Economic Development Zone, Beijing Patentee before: ZK ENERGY SCIENCE & TECHNOLOGY Co.,Ltd. Effective date of registration: 20210630 Address after: Room 1301-02, northwest of Bayi Bridge, Furong Middle Road, wangluyuan street, Kaifu District, Changsha City, Hunan Province 410005 Patentee after: Hunan Zhongnanshan Technology Development Co.,Ltd. Address before: 101511 room 508-28, Xitiangezhuang town government office building, No.8 Xitong Road, Miyun Economic Development Zone, Beijing Patentee before: Beijing Huayuan Hongsheng Energy Technology Co.,Ltd. |