CN104459389B - It is a kind of to input determination methods and system that electricity is shaken in power down - Google Patents
It is a kind of to input determination methods and system that electricity is shaken in power down Download PDFInfo
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- CN104459389B CN104459389B CN201410706006.0A CN201410706006A CN104459389B CN 104459389 B CN104459389 B CN 104459389B CN 201410706006 A CN201410706006 A CN 201410706006A CN 104459389 B CN104459389 B CN 104459389B
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Abstract
Determination methods and system that electricity is shaken in power down are inputted the invention discloses a kind of, applied to net side without LCL filter or the high pressure four-quadrant frequency converter of LC wave filters, three-phase input line voltage is subjected to dq conversion and obtains d shaft voltages, the electric power down threshold voltage of the d shaft voltages value and presetting rolling is compared after filtering, it is electric to occur power down or rolling during power down threshold value electric more than presetting rolling, determine whether specially to occur power down or shake electricity, the output of frequency converter locking pulse judges whether the line voltage virtual value is less than default power down threshold value after reaching presetting time value, if, then it is defined as occurring power down, if being otherwise defined as occurring to shake electricity, method is easy and effective, it can rapidly and accurately judge whether power network occurs power down or shake electricity, facilitate and further take corresponding software to control or handle inside frequency converter.
Description
Technical field
It is more particularly to a kind of to input determination methods and system that electricity is shaken in power down the present invention relates to field of power electronics.
Background technology
Frequency converter is the electric energy control that power frequency supply is transformed to another frequency using the on-off action of power semiconductor device
Device processed.High voltage converter is widely used in large-scale mining industry factory, petrochemical industry, municipal water supply, iron and steel metallurgy, electric power
Various blower fans, water pump, compressor, rolling mill of the industries such as the energy etc..
The working environment of high voltage converter is complicated, and power network can there is a situation where to shake electricity or power down, and now frequency converter needs
Quickly judge, for the high voltage converter of four quadrant running, even if electric network power-fail, frequency conversion when the operation of its energy feedback
Also there is voltage in device input side, cause frequency converter to judge electric network power-fail in time and continue feedback operation, work as electric network power-fail
When, if frequency converter is in energy feedback running status, frequency converter rectification side feedback electric energy, at this time will be on power network to power network
Other load equipments impact because now frequency converter still feedback energy is to power network, to other load equipments on power network
Power supply, it is harmful to load equipment even to damage load equipment.
Traditional determination methods have virtual value calculating method, peak value determining method and fundametal compoment method etc..Virtual value calculating method is
Detect that grid line voltage instantaneous value calculates grid line voltage virtual value, it is specified according to grid line voltage virtual value and grid line voltage
Virtual value falls degree and the degree of unbalancedness of line voltage to calculate the amplitude of each phases line voltage, further according to the injustice of line voltage
Weighing apparatus degree judges the operating mode of power network；Peak value determining method judges the operating mode of power network according to crest voltage on the function of time；Fundamental wave
The operating mode of power network is judged after being calculated using Fourier transformation FFT for component method, it is necessary to the voltage sample of half period.But on
Stating several method can be present：Sampling circuit samples to line voltage can have burr, to power network virtual value calculate
Error is brought, easily causes erroneous judgement；In the frequency convertor system of four quadrant running, even if electric network power-fail, its input side can be present
The voltage of feedback, so as to grid voltage amplitude and will not change significantly in the rated value short time, leads to not judge power down；
Half-cycle voltage sampling is present than larger delay.
, can not be accurate using traditional determination methods frequency converter in the case where power network operating mode is poor in the presence of often electricity is shaken
Differentiate and shake electricity and power down, frequency converter erroneous judgement will be caused to be shut down for power down, so that the power network of high pressure four-quadrant frequency converter
Adaptability is deteriorated.Therefore a kind of fast and accurately rolling electricity and power down determination methods are needed.
The content of the invention
In view of this, can it is a primary object of the present invention to provide a kind of determination methods and system for inputting power down rolling electricity
Rapidly and accurately to judge input power down or shake electricity.
To achieve the above object, the invention provides it is a kind of input power down shake electricity determination methods, applied to net side without
The high pressure four-quadrant frequency converter of LCL filter or LC wave filters, including：
Three-phase input line voltage is obtained into phase angle by phaselocked loop；
Dq conversion is carried out to the three-phase input line voltage using the phase angle, d shaft voltages and q axles electricity is obtained
Pressure；
Obtained d shaft voltages and q shaft voltages is filtered and obtains stable voltage；
Judge whether the filtered d shaft voltages value is more than the electric power down threshold value of presetting rolling, if it is frequency converter
Locking pulse output reaches presetting time value, if it is not, then determining that power down does not occur or shaking electricity；
The output of frequency converter locking pulse reach judge after presetting time value the frequency converter input voltage whether
Less than default power down threshold value, if it is, being defined as occurring power down, if being otherwise defined as occurring to shake electricity.
Preferably, the presetting time value is 1-5ms.
Preferably, the power down threshold value is the 40%-60% of line voltage rated value.
Preferably, it is defined as occurring also to include after shaking electricity：Frequency converter recovers pulse output.
Preferably, judge the filtered d shaft voltages value also includes after whether being more than the electric power down threshold value of presetting rolling
The judged result is shown.
Preferably, judging whether the line voltage virtual value is less than after default power down threshold value also includes judging described
As a result shown.
Present invention also offers the judgement system that electricity is shaken in a kind of input power down of high pressure four-quadrant frequency converter, including：
Phase acquisition module, for three-phase input line voltage to be obtained into phase angle by phaselocked loop；
Decomposing module is converted, for carrying out dq conversion to the three-phase input line voltage using the phase angle, is obtained
To d shaft voltages and q shaft voltages；
Filtration module, stable voltage is obtained for being filtered to obtained d shaft voltages and q shaft voltages；
First judge module, for judging whether the filtered d shaft voltages value is more than the electric power down threshold of presetting rolling
Value；
Lockout module, presetting time value is reached for blocking frequency converter pulse output；
Second judge module, for judging whether the line voltage virtual value is less than default power down threshold value；
Determining module, for determining to occur power down or occurring to shake electricity.
Preferably, the system also includes：
First threshold setting module, electric power down threshold value is shaken for setting；
Second Threshold setting module, the time value for setting the output of frequency converter locking pulse；
3rd threshold setting module, for setting power down threshold value.
Preferably, the system also includes：
Recovery module, for recovering frequency converter pulse output after it is determined that occurring to shake electricity.
Preferably, the system also includes：
Display module, determines that the electric situation of power down or rolling occurred is shown for.
The determination methods and system of electricity are shaken in the input power down provided using the present invention, applied to net side without LCL filter
Or the high pressure four-quadrant frequency converter of LC wave filters, three-phase input line voltage is subjected to dq conversion and obtains d shaft voltages, will after filtering
The d shaft voltages value is compared with the electric power down threshold voltage of presetting rolling, is generation during power down threshold value electric more than presetting rolling
Electricity is shaken in power down, determines whether specially to occur power down or shakes electricity, when the output of frequency converter locking pulse reaches presetting
Between judge whether the line voltage virtual value is less than default power down threshold value after value, if it is, be defined as occurring power down,
If being otherwise defined as occurring to shake electricity, method is easy and effective, can rapidly and accurately judge whether power network occurs power down or rolling
Electricity, facilitates and further takes corresponding software to control or handle inside frequency converter.
Brief description of the drawings
In order to illustrate more clearly about the embodiment of the present invention or technical scheme of the prior art, below will be to embodiment or existing
There is the accompanying drawing used required in technology description to be briefly described, it should be apparent that, drawings in the following description are only this
The embodiment of invention, for those of ordinary skill in the art, on the premise of not paying creative work, can also basis
The accompanying drawing of offer obtains other accompanying drawings.
Fig. 1 is net side without LCL filter or the structural representation of LC wave filter high pressure four-quadrant frequency converters；
Fig. 2 inputs the flow chart that the determination methods of electricity are shaken in power down for the present invention is a kind of；
Fig. 3 inputs the another flow chart that the determination methods of electricity are shaken in power down for the present invention is a kind of；
Fig. 4 is voltage oscillogram when line voltage is normal；
Voltage oscillogram when Fig. 5 is generation power down；
Fig. 6 shakes voltage oscillogram during electricity for generation；
Fig. 7 inputs the structural representation that the judgement system of electricity is shaken in power down for the present invention is a kind of；
Fig. 8 inputs the another structural representation that the judgement system of electricity is shaken in power down for the present invention is a kind of；
Fig. 9 inputs the another structural representation that the judgement system of electricity is shaken in power down for the present invention is a kind of.
Embodiment
Below in conjunction with the accompanying drawing in the embodiment of the present invention, the technical scheme in the embodiment of the present invention is carried out clear, complete
Site preparation is described, it is clear that described embodiment is only a part of embodiment of the invention, rather than whole embodiments.It is based on
Embodiment in the present invention, it is every other that those of ordinary skill in the art are obtained under the premise of creative work is not made
Embodiment, belongs to the scope of protection of the invention.
The determination methods that electricity is shaken in power down are inputted the invention provides a kind of, are filtered applied to net side without LCL filter or LC
The high pressure four-quadrant frequency converter of ripple device, as shown in figure 1, the high pressure four-quadrant for net side without LCL filter or LC wave filters becomes
Frequency device structural representation, as shown in Fig. 2 the specific embodiment flow chart of electric determination methods is shaken for present invention input power down, including
Step：
Step S101：Three-phase input line voltage is obtained into phase angle by phaselocked loop；
By three-phase input line voltage Ua, Ub and Uc by phaselocked loop, obtain carrying out the phase required for dq conversion.
Step S102：Dq conversion is carried out to the three-phase input line voltage using the phase angle, d shaft voltages are obtained
With q shaft voltages；
Voltage Ua, Ub and Uc are carried out into dq conversion using obtained phase angle to decompose, d shaft voltage Ud and q axle electricity is obtained
Press Uq.Dq conversion is a kind of decoupling control method, and the three-phase windings of asynchronous motor are transformed to the two-phase winding of equivalence by it, and
And rotating coordinate system is converted the static coordinate being orthogonal, i.e., it can obtain being represented the relational expression of voltage and electric current with DC quantity.dq
Conversion allows each controlled quentity controlled variable to control respectively, can be with the influence of harmonic carcellation voltage and asymmetrical voltage, due to applying
Synchronous rotating angle, easily realizes the separation of fundamental wave and harmonic wave.
Step S103：Obtained d shaft voltages and q shaft voltages is filtered and obtains stable voltage；
Ud and Uq are filtered.
Step S104：Judge whether the filtered d shaft voltages value is more than the electric power down threshold value of presetting rolling, if
Then enter step S105, if otherwise entering step S106；
It is that frequency converter in house software is determined according to the calibration of d shaft voltages that electric threshold value is shaken in power down.
Step S105：The output of frequency converter locking pulse reaches presetting time value；
When Ud is more than presetting rolling electricity power down threshold value, it may be determined that occur power down or rolling, now frequency converter locking pulse
Export (control of frequency converter in house software), stop feedback operation, and continue a presetting time value, 1-5ms can.When
When frequency converter is operated in feedback running status, frequency converter block rectification side pulse output.Step S106：It is determined that do not occur power down or
Person shakes electricity；
When Ud is not more than presetting rolling electricity power down threshold value, it is determined that power down does not occur or electricity is shaken, frequency converter continues normal
Operation.
Step S107：Judge whether the line voltage virtual value is less than default power down threshold value, if yes then enter step
Rapid S108, if otherwise entering step S109；
The output of frequency converter locking pulse continue for after presetting time value, judge after the output of frequency converter locking pulse
Whether line voltage virtual value is less than the 40%-60% of presetting a power down threshold value, such as line voltage rated value.
Step S108：It is defined as occurring power down；
The line voltage virtual value of the frequency converter locking pulse output is defined as occurring less than presetting power down threshold value
Power down.
Step S109：It is defined as occurring to shake electricity.
Line voltage virtual value after the frequency converter locking pulse output is defined as not less than presetting power down threshold value
Electricity is shaken in generation.
This method is applied to net side without LCL filter or the high pressure four-quadrant frequency converter of LC wave filters, if net side band
LCL filter or LC wave filters, then the electricity on the electric capacity inside wave filter will not disappear quickly, influence the present invention judgement.
The determination methods of electricity are shaken in the input power down provided using the present embodiment, and three-phase input line voltage is carried out into dq conversion obtains d axles
Voltage, is compared the electric power down threshold voltage of the d shaft voltages value and presetting rolling after filtering, more than the electric power down of presetting rolling
To occur power down or shaking electricity during threshold value, determine whether specially to occur power down or shake electricity, the output of frequency converter locking pulse reaches
Judge whether the line voltage virtual value is less than default power down threshold value after to presetting time value, if it is, really
It is set to generation power down, if being otherwise defined as occurring to shake electricity, method is easy and effective, can rapidly and accurately judge whether power network is sent out
Electricity is shaken in raw power down, facilitates and further takes corresponding software to control or handle inside frequency converter, can also be to judged result
Carrying out display facilitates operating personnel to check.This determination methods is particularly suitable for use in high pressure four-quadrant frequency converter and is operated in energy feedback fortune
During row state, its adverse effect to other loads on power network produced by power down can be solved.Frequency converter is operated in feedback fortune
When row state or inverter operation state, the present invention can ensure that shaking electricity does not shut down, a period of time in the case of power down
Interior (such as within 5 seconds) if power system restoration normally if can normally be run and (controlled by frequency converter in house software with automatic start
Realize).
As shown in figure 3, shaking the still another embodiment flow chart of the determination methods of electricity for present invention input power down, correspond to
Fig. 1 flow chart, in addition to：
Step S110：Frequency converter recovers pulse output.
Concretely frequency converter rectification side recovers pulse output (being controlled to realize by frequency converter in house software).
Three-phase input line voltage is carried out dq decomposition, filtering by the present embodiment, then judges whether d shaft voltage components Ud has
Mutation, when line voltage is normal, Ud will not undergo mutation, as shown in Figure 4.If Ud is mutated and exceedes setting value, table
Show that power network shakes electricity or power down, the output of high pressure four-quadrant frequency converter locking pulse stops feedback operation, and be delayed 2ms, prolongs in this 2ms
When the time in, high pressure four-quadrant frequency converter exports no feedback operation due to locking pulse, if line voltage virtual value is less than
To a certain extent, such as 40%-60% rated values then prove that power down occurs for power network to rated value.
As shown in Figure 5：1 represents line voltage instantaneous value, and 2 represent line voltage virtual value, and 3 be pulse output, and 4 represent electricity
Net voltage d axis component Ud, are in the case that Ud undergos mutation, to represent that power network occurs abnormal, now block arteries and veins in curve shown in 4
Punching output 2ms, judgment curves 2 are the half that line voltage virtual value is less than rated value after 2ms is delayed, it was demonstrated that electric network power-fail
, at this moment high pressure four-quadrant frequency converter locking pulse output.
As shown in Figure 6：1 represents line voltage instantaneous value, and 2 represent virtual value, and 3 block output 2ms are identified, and 4 be that pulse is defeated
Go out, 5 represent line voltage d axis component Ud, be in the case that Ud undergos mutation, to represent that power network occurs abnormal in curve shown in 5, this
When locking pulse output 2ms, 2ms be delayed after judgment curves 2 be line voltage virtual value be less than rated value half,
Prove to be strictly to shake electricity, such high pressure four-quadrant frequency converter continues feedback operation.
The present embodiment provide determination methods have the advantages that quick and precisely, not erroneous judgement, and high pressure four-quadrant change
When the feedback of frequency device is run, it also can fast and accurately judge electric network power-fail, high pressure four-quadrant frequency converter pulse can be blocked in time
Output stops feedback, it is to avoid the also feedback operation when power down occurs for power network of high pressure four-quadrant frequency converter is made to other loads on power network
Into influence, and rolling electricity and power down can be accurately differentiated, improve adaptability of the high pressure four-quadrant frequency converter to power network.
The judgement system of electricity is shaken present invention also offers a kind of input power down of high voltage converter, as shown in fig. 7, being the present invention
The example structure schematic diagram of system, including：
Phase acquisition module 101, for three-phase input line voltage to be obtained into phase angle by phaselocked loop；
Decomposing module 102 is converted, is connected with the phase acquisition module 101, for utilizing the phase angle to institute
State three-phase input line voltage and carry out dq conversion, obtain d shaft voltages and q shaft voltages；
Filtration module 103, is connected with the conversion decomposing module 102, for the d shaft voltages and q shaft voltages to obtaining
It is filtered and obtains stable voltage；
First judge module 104, is connected with the filtration module 102, for judging the filtered d shaft voltages value
Whether presetting rolling electric power down threshold value is more than；
Lockout module 105, is connected with first judge module 104, for block frequency converter pulse output reach it is pre-
The time value of setting；
Second judge module 106, is connected with the lockout module 105, for judging that the line voltage virtual value is
It is no to be less than default power down threshold value；
Determining module 107, is connected with the judge module 106 of the first judge module 104 and second, for determining occur
Power down occurs to shake electricity.
The judgement system of electricity is shaken in the input power down provided using the present invention, and three-phase input line voltage progress dq is become and got in return
To d shaft voltages, the electric power down threshold voltage of the d shaft voltages value and presetting rolling is compared after filtering, more than presetting rolling
To occur power down or shaking electricity during electric power down threshold value, determine whether specially to occur power down or shake electricity, frequency converter locking pulse
Output judges whether the line voltage virtual value is less than default power down threshold value after reaching presetting time value, if
It is, it is determined that to occur power down that, if being otherwise defined as occurring to shake electricity, method is easy and effective, can rapidly and accurately judge electricity
Whether net occurs power down or shakes electricity, facilitates and further takes corresponding software to control or handle inside frequency converter, improves change
Adaptability of the frequency device to power network.
As shown in figure 8, being the another example structure schematic diagram of present system, corresponding to the structural representation shown in Fig. 7
Figure, in addition to：
First threshold setting module 108, is connected with first judge module 104, and electric power down threshold value is shaken for setting；
Second Threshold setting module 109, is connected with the lockout module 105, defeated for setting frequency converter locking pulse
The time value gone out；
3rd threshold setting module 110, is connected with second judge module 106, for setting power down threshold value.
As shown in figure 9, being the another example structure schematic diagram of present system, corresponding to the structural representation shown in Fig. 8
Figure, in addition to：
Recovery module 111, is connected with the lockout module 105, for recovering frequency converter arteries and veins after it is determined that occurring to shake electricity
Punching output.
Display module 112, is connected with the determining module 107, the electric situation of power down or rolling occurred for pair determination
Shown.
It should be noted that each embodiment in this specification is described by the way of progressive, each embodiment weight
Point explanation be all between difference with other embodiment, each embodiment identical similar part mutually referring to.
For system embodiment, because it is substantially similar to embodiment of the method, so description is fairly simple, related part is referring to method
The part explanation of embodiment.
Finally, in addition it is also necessary to explanation, herein, such as first and second or the like relational terms be used merely to by
One entity or operation make a distinction with another entity or operation, and not necessarily require or imply these entities or operation
Between there is any this actual relation or order.Moreover, term " comprising ", "comprising" or its any other variant meaning
Covering including for nonexcludability, so that process, method, article or equipment including a series of key elements not only include that
A little key elements, but also other key elements including being not expressly set out, or also include be this process, method, article or
The intrinsic key element of equipment.In the absence of more restrictions, the key element limited by sentence "including a ...", is not arranged
Except also there is other identical element in the process including the key element, method, article or equipment.
The determination methods and system that electricity is shaken in input power down provided by the present invention are described in detail above, herein
Apply specific case to be set forth the principle and embodiment of the present invention, the explanation of above example is only intended to help
Understand the method and its core concept of the present invention；Simultaneously for those of ordinary skill in the art, according to the thought of the present invention,
It will change in specific embodiments and applications, in summary, this specification content should not be construed as to this
The limitation of invention.
Claims (10)
1. a kind of input the determination methods that electricity is shaken in power down, it is characterised in that applied to net side without LCL filter or LC wave filters
High pressure four-quadrant frequency converter, including：
Three-phase input line voltage is obtained into phase angle by phaselocked loop；
Dq conversion is carried out to the three-phase input line voltage using the phase angle, d shaft voltages and q shaft voltages is obtained；
Obtained d shaft voltages and q shaft voltages is filtered and obtains stable voltage；
Judge whether the filtered d shaft voltages value is more than the electric power down threshold value of presetting rolling, if it is frequency converter is blocked
Pulse output reaches presetting time value, if it is not, then determining that power down does not occur or shaking electricity；
The output of frequency converter locking pulse judges whether the line voltage virtual value is less than in advance after reaching presetting time value
If power down threshold value, if it is, be defined as occur power down, if be otherwise defined as occur shake electricity.
2. according to the method described in claim 1, it is characterised in that the presetting time value is 1-5ms.
3. according to the method described in claim 1, it is characterised in that the power down threshold value is the 40%- of line voltage rated value
60%.
4. according to the method described in claim 1, it is characterised in that be defined as occurring also to include after shaking electricity：
Frequency converter recovers pulse output.
5. according to the method described in claim 1, it is characterised in that judge whether the filtered d shaft voltages value is more than pre-
Also include showing the judged result after the electric power down threshold value of the rolling of setting.
6. according to the method described in claim 1, it is characterised in that judge whether the line voltage virtual value is less than default
Also include showing the judged result after power down threshold value.
7. the judgement system of electricity is shaken in a kind of high pressure four-quadrant frequency converter input power down, it is characterised in that including：
Phase acquisition module, for three-phase input line voltage to be obtained into phase angle by phaselocked loop；
Decomposing module is converted, for carrying out dq conversion to the three-phase input line voltage using the phase angle, d axles are obtained
Voltage and q shaft voltages；
Filtration module, stable voltage is obtained for being filtered to obtained d shaft voltages and q shaft voltages；
First judge module, for judging whether the filtered d shaft voltages value is more than the electric power down threshold value of presetting rolling；
Lockout module, presetting time value is reached for blocking frequency converter pulse output；
Second judge module, for judging whether the line voltage virtual value is less than default power down threshold value；
Determining module, for determining to occur power down or occurring to shake electricity.
8. system according to claim 7, it is characterised in that also include：
First threshold setting module, electric power down threshold value is shaken for setting；
Second Threshold setting module, the time value for setting the output of frequency converter locking pulse；
3rd threshold setting module, for setting power down threshold value.
9. system according to claim 7, it is characterised in that also include：
Recovery module, for recovering frequency converter pulse output after it is determined that occurring to shake electricity.
10. system according to claim 7, it is characterised in that also include：
Display module, determines that the electric situation of power down or rolling occurred is shown for.
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| CN108344902B (en) * | 2017-10-24 | 2021-06-29 | 广东电网有限责任公司汕头供电局 | Power loss judgment method and device for flexible direct current power transmission device facing inspection personnel |
| CN109188990B (en) * | 2018-11-12 | 2024-03-26 | 苏州易德龙科技股份有限公司 | Power failure detection method and system |
| CN112491126B (en) * | 2020-10-23 | 2023-09-08 | 许昌昌龙电气股份有限公司 | Portable bypass anti-interference device and operation method thereof |
| CN112744081B (en) * | 2021-01-19 | 2022-09-23 | 株洲中车时代电气股份有限公司 | Method and system for rapidly detecting whether train enters non-zone state and related components |
| CN112881788B (en) * | 2021-02-24 | 2022-08-02 | 深圳市中电软件有限公司 | Motor restarting method and system based on electric dazzling rapid identification method |
| CN113192449B (en) * | 2021-04-16 | 2022-05-06 | 惠科股份有限公司 | Display panel driving circuit and driving method |
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