CN107561347A - Voltage dip order of severity evaluation method and system - Google Patents
Voltage dip order of severity evaluation method and system Download PDFInfo
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Abstract
The present invention relates to a kind of voltage dip order of severity evaluation method and system, and the weight function of voltage dip performance impact degree is calculated according to voltage dip tolerance curve, voltage dip disturbance degree is calculated according to the weight function；Wherein, the voltage dip disturbance degree represents the order of severity of voltage dip event；Calculate the time parameter of corresponding sampled point respectively according to the measurement voltage value of each sampled point during voltage dip, the time parameter of each sampled point is substituted into the voltage dip disturbance degree respectively, obtain the single voltage dip performance parameter of corresponding sampled point；The maximum in voltage dip performance parameter is set to the single voltage dip order of severity of voltage dip event.
Description
Technical field
The present invention relates to power quality analysis technical field, more particularly to a kind of voltage dip order of severity evaluation method
And system.
Background technology
Voltage dip is the key problem that power quality field is faced.Voltage dip causes larger to industrial user
Influence, the huge economic losses for endangering and its bringing caused by voltage dip are the major issues that many users face.To calculate
Many precise electronic and power electronic controller based on machine, microprocessor controller is very sensitive to voltage dip.
Temporarily drop point is index more conventional in the detection of the voltage dip order of severity, and the index has been powered that department is actual to answer
With being characterized in considering the temporary drop event of any duration, in practice using relatively broad.In addition, temporarily drop event is tight
Principal characteristic index, energy indexes, SARFI (System Average RMS Variation Frequency Index, system voltage
Mean effective value rate of change index) index index, isopotential map, statistical table etc. be also detect the voltage dip order of severity conventional
Index.However, these indexs are when carrying out the detection of the voltage dip order of severity, generally to detect accuracy relatively low.
The content of the invention
Based on this, it is necessary to for detecting the problem of accuracy is relatively low, there is provided a kind of voltage dip order of severity evaluation side
Method and system.
A kind of voltage dip order of severity evaluation method, comprises the following steps：
The weight function of voltage dip performance impact degree is calculated according to voltage dip tolerance curve, according to the weight function
Calculate voltage dip disturbance degree；Wherein, the voltage dip disturbance degree represents the order of severity of voltage dip event；
Calculate the time parameter of corresponding sampled point respectively according to the measurement voltage value of each sampled point during voltage dip,
The time parameter of each sampled point is substituted into the voltage dip disturbance degree respectively, obtains the single voltage dip of corresponding sampled point
Performance parameter；
The maximum in voltage dip performance parameter is set to the single voltage dip order of severity of voltage dip event.
A kind of voltage dip order of severity evaluation system, including：
First computing module, for calculating the weights letter of voltage dip performance impact degree according to voltage dip tolerance curve
Number, voltage dip disturbance degree is calculated according to the weight function；Wherein, the voltage dip disturbance degree represents voltage dip event
The order of severity；
Second computing module, for being calculated respectively correspondingly according to the measurement voltage value of each sampled point during voltage dip
The time parameter of sampled point, the time parameter of each sampled point is substituted into the voltage dip disturbance degree respectively, obtain corresponding adopt
The single voltage dip performance parameter of sampling point；
Setup module, the single voltage for the maximum in voltage dip performance parameter to be set to voltage dip event are temporary
The order of severity drops.
Above-mentioned voltage dip order of severity evaluation method and system, by the weights letter for calculating voltage dip performance impact degree
Number, so as to calculate voltage dip disturbance degree, single electricity is calculated according to the measurement voltage value of each sampled point during voltage dip
Pressure temporarily drop performance parameter, and the single voltage dip that the maximum in voltage dip performance parameter is set to voltage dip event is tight
Weight degree, available for the accurate assessment of voltage dip, it effectively prevent the excessive assessment in existing index, owe the problem of estimation,
Improve voltage dip order of severity detection accuracy.
Brief description of the drawings
Fig. 1 is the voltage dip order of severity evaluation method flow chart of one embodiment；
Fig. 2 is the sensitive equipment broad sense tolerance curve of one embodiment；
Fig. 3 (a) is that the key node schematic diagram of determination temporarily drops in the single-phase/two-phase voltage of one embodiment；
Fig. 3 (b) is the key node schematic diagram that the three-phase voltage sag of one embodiment determines；
Fig. 4 (a) is that the weight function curve for the duration disturbance degree that the single-phase/two-phase voltage of one embodiment temporarily drops shows
It is intended to；
Fig. 4 (b) is the weight function curve synoptic diagram of the duration disturbance degree of the three-phase voltage sag of one embodiment；
Fig. 5 (a) is the weight function curve signal for the amplitude disturbance degree that the single-phase/two-phase voltage of one embodiment temporarily drops
Figure；
Fig. 5 (b) is the weight function curve synoptic diagram of the amplitude disturbance degree of the three-phase voltage sag of one embodiment；
Fig. 6 (a) is the actual instantaneous value waveform diagram of voltage dip of certain voltage dip event of one embodiment；
Fig. 6 (b) is the actual root mean square waveform diagram of voltage dip of certain voltage dip event of one embodiment；
Fig. 7 is the module map of the voltage dip order of severity evaluation system of one embodiment.
Embodiment
Technical scheme is illustrated below in conjunction with the accompanying drawings.
The detailed reasoning analysis method of following discloses and demonstration analysis example.However, specific reasoning and analysis disclosed herein
Procedural details are demonstrated merely for the sake of description analyzes the purpose of example.
It should be appreciated, however, that the present invention is not limited to disclosed particular exemplary embodiment, but covering falls into disclosure model
Enclose interior all modifications, equivalent and alternative.In the description to whole accompanying drawings, identical reference represents identical member
Part.
As shown in figure 1, the present invention provides a kind of voltage dip order of severity evaluation method, it may include following steps：
S1, the weight function of voltage dip performance impact degree is calculated according to voltage dip tolerance curve, according to the weights
Function calculates voltage dip disturbance degree；Wherein, the voltage dip disturbance degree represents the order of severity of voltage dip event；
Sensitive equipment tolerance curve with reference to shown in Fig. 2, voltage dip duration and voltage dip amplitude are considered respectively
To the order of severity influence characteristic of voltage dip event, the duration is longer, the more low then voltage dip of amplitude is more serious, corresponding
It is also bigger to influence angle value, is specially：The voltage dip event occurred in Fig. 2 in fault-free region will not cause equipment fault, then
In this region the influence angle value strainization of voltage dip duration and voltage dip amplitude slowly, and close to 0；In failure
Voltage dip event in region, can cause equipment fault, therefore voltage dip duration and voltage dip width in this region
The influence angle value of value should be shallower, and close to 1；Voltage dip event in uncertain region, the voltage dip duration or
The change of voltage dip amplitude can produce large effect to equipment, and the disturbance degree value changes of the two are very fast, and duration and width
Be worth influences should have the faster characteristic of the gentle intermediate change in both ends to the order of severity of voltage dip event.Therefore, in a reality
Apply in example, can use using minor function and be used as duration and the weight function of amplitude：
Wherein K, a, b are control parameter, herein K=1；X is independent variable, in the present invention correspond to temporarily drop duration T or
Temporary decline U；Y is dependent variable, corresponds to weight function TD (T), the TD of temporarily drop duration T disturbance degree in the present invention3(T) or
Weight function MD (U), the MD of temporary decline U disturbance degrees3(U).The weight function that the present embodiment uses can largely simulation
Influence characteristic of the duration with amplitude to voltage dip event under truth, improves follow-up accuracy in computation.
In one embodiment, the trip point of the voltage dip tolerance curve can be obtained；According in the trip point
Maximum and minimum calculate the control parameter of the weight function；The weight function is determined according to the control parameter.
Event and two-phase voltage temporarily drop in single-phase voltage, and temporarily the event of dropping can be used as a kind of voltage dip event to consider, due to it
It is asymmetric temporarily drop, therefore for both asymmetric single-phase/two-phases, temporarily drop gives unified mark for C4.110 working groups
Accurate temporarily drop tolerance curve, and the SEMI F47 curves, ITIC curves in existing standard tolerance curve be not for temporarily drop type
Difference provides corresponding tolerance curve, therefore thinks that SEMI F47 curves are applied to all temporarily drop classes with ITIC curves in the present invention
Type；On the other hand, due to difference between various criterion tolerance curve, to consider different standard toleragenic curves as a whole, this
Standard curve these three tolerance curves that invention combines that SEMI F47 curves, ITIC curves and C4.110 working groups provide, energy
Enough so that the selection of key node is more accurate.It is 0.02s, 0.2s and 0.5s in the duration as shown in Fig. 3 (a), tolerance is bent
Line saltus step, when temporary decline is 0.4,0.5,0.7 and 0.8, tolerance curve saltus step.The saltus step of tolerance curve shows the shape of equipment
State is mutated, i.e., the duration of voltage dip or temporary decline, which change minimum value, will cause the mutation of equipment state.And
In each duration section, when temporary decline determines that the duration has little to no effect to equipment state, in each temporary decline area
In section, determined when the duration, temporary decline has little to no effect to the state of equipment, therefore these trip points are to determine to influence
The key of function distribution to be spent, selects two extreme values respectively, the key point for determining the voltage dip duration is 0.02s and 0.5s,
The key point of voltage dip amplitude is 0.4 and 0.8.
Temporarily dropped for three-phase, according to existing standard toleragenic curve SEMI F47 curves, ITIC curves and C4.110 works
Tolerance curve temporarily drops for the standard that symmetrical three-phase temporarily drops as what group provided, as shown in Fig. 3 (b), it is contemplated that identical temporarily drop feelings
Under condition three-phase the order of severity temporarily drops and should be higher than single-phase, therefore three curves are combined obtain a sensitivity the most serious here
The coenvelope line of equipment tolerance curve, i.e. Fig. 3 (b), for this curve, when the duration is 0.02s, 0.2s, tolerance is bent
Line saltus step, when temporary decline is 0.7,0.8, tolerance curve saltus step, two extreme values is selected respectively, it is thus determined that the duration
Key point is 0.02s and 0.2s, and the key point of temporary decline is 0.7 and 0.8.
Temporarily dropped for single-phase/two-phase, in the temporarily weight function of disturbance degree corresponding to drop duration T, it is believed that curve
Lower section is faulty section, and it influences angle value close to 1, and is non-faulty section above curve, and it influences angle value close to 0, can choose
95% confidential interval, therefore it is 0.05 to make influence angle value corresponding to duration 0.02s, is influenceed corresponding to the duration 0.5
Angle value is 0.95, and is mapped as according to duration criterion Interval Maps, 0.02s standardization mapping value for 0,0.5s
0.375, therefore the weight function of disturbance degree corresponding to duration T crosses point (0,0.05) and (0.375,0.95), expression formula are：
It similarly can obtain three-phase and temporarily fall the weight function expression formula of disturbance degree corresponding to duration T and be：
Shown in voltage dip duration disturbance degree change curve such as Fig. 4 (a) that single-phase/two-phase voltage temporarily drops, three-phase electricity
Press shown in the voltage dip duration disturbance degree change curve such as Fig. 4 (b) temporarily dropped.
Temporarily dropped for single-phase/two-phase, in the weight function of disturbance degree corresponding to temporary decline U, it is believed that below curve
For faulty section, it influences angle value close to 1, and is non-faulty section above curve, and its disturbance degree angle value chooses 95% close to 0
Confidential interval, influence angle value when to make amplitude be 0.4 is 0.95, and influence angle value when amplitude is 0.8 is 0.15, therefore temporarily drop
The weight function of disturbance degree corresponding to amplitude U crosses point (0.4,0.95) and (0.8,0.15), and expression formula is：
The weight function expression formula that similarly can obtain disturbance degree corresponding to the temporary decline U that three-phase is temporarily fallen is：
Shown in voltage dip amplitude disturbance degree change curve such as Fig. 5 (a) that single-phase/two-phase voltage temporarily drops, three-phase voltage is temporary
Shown in voltage dip amplitude disturbance degree change curve such as Fig. 5 (b) of drop.
Further, the voltage magnitude U and duration T during event temporarily drops temporarily are dropped for single-phase/two-phase, can distinguished
Calculating it influences angle value, then uses what normalization modulus value quantization means amplitude after the two combination was characterized with the duration
The temporarily drop order of severity, modulus value show that more greatly temporarily drop is more serious, and calculation formula is：
In formula, MTD (U, T) is that the voltage dip disturbance degree that event temporarily drops in event or two-phase voltage, MD temporarily drop in single-phase voltage
(U) temporarily drop event or two-phase voltage for single-phase voltage and temporarily drop voltage dip disturbance degree, TD corresponding to the voltage dip amplitude of event
(T) temporarily drop event or two-phase voltage for single-phase voltage and temporarily drop voltage dip influence corresponding to the voltage dip duration of event
Degree.
Similarly, corresponding disturbance degree calculation formula is as follows during three-phase voltage sag：
In formula, MTD3(U, T) is voltage dip disturbance degree, MD3(U) it is the voltage dip amplitude of three-phase voltage sag event
Corresponding voltage dip disturbance degree, TD3(T) it is voltage dip corresponding to the voltage dip duration of three-phase voltage sag event
Disturbance degree.
S2, calculate the time ginseng of corresponding sampled point respectively according to the measurement voltage value of each sampled point during voltage dip
Number, the time parameter of each sampled point is substituted into the voltage dip disturbance degree respectively, obtain the single voltage of corresponding sampled point
Temporarily drop performance parameter；
This step can be assessed the single event voltage dip order of severity.Specifically, event temporarily drops for certain, and it is first
Voltage dip s is first described using voltage U and time t functional relation：
U=s (t) or t=s-1(U)
Then in conjunction with temporary drop measurement voltage Wave data, for any one voltage magnitude U during temporarily dropc, generally
It is U that voltage in waveform temporarily drops in corresponding measurement voltagecTwo time point tc1, tc2.Definition:
T(Uc)=| tc1-tc2|(0.1≤Uc≤0.9)
T (U in formulac) it is that voltage magnitude is no more than U during temporarily droppingcThe corresponding time.UcRepresent the values of U at any time.
Finally by a series of rational voltage thresholds are chosen, using its corresponding duration time sequence as a kind of more temporarily drops
Threshold value and the voltage dip new description of duration.
Threshold value and duration time sequence T (0.9), T (0.9-h), T (0.9-2h) ... T (0.1) will temporarily drop more in the present invention
As the new description method of voltage dip, h=0.1.For above-mentioned each threshold value, can respectively obtain：
MTD(0.9,T(0.9)),MTD(0.9-h,T(0.9-h)),
MTD(0.9-2h,T(0.9-2h)),…,MTD(0.1,T(0.1))
And
MTD3(0.9,T(0.9)),MTD3(0.9-h,T(0.9-h)),
MTD3(0.9-2h,T(0.9-2h)),…,MTD3(0.1,T(0.1))
S3, the maximum in voltage dip performance parameter is set to the serious journey of single voltage dip of voltage dip event
Degree.
The Severity of event temporarily drops for single, and the present invention proposes a kind of electricity that method is described based on multi thresholds
Combined influence degree index temporarily drops in pressure, wherein the influence angle value that single-phase/two-phase temporarily drops is calculated as follows：
D=max MTD (0.9, T (0.9)), MTD (0.9-h, T (0.9-h)),
MTD (0.9-2h, T (0.9-2h)) ..., MTD (0.1, T (0.1)) }
The influence angle value that three-phase temporarily drops is calculated as follows：
D3=max { MTD3(0.9,T(0.9)),MTD3(0.9-h,T(0.9-h)),
MTD3(0.9-2h, T (0.9-2h)) ..., MTD3(0.1,T(0.1))}
I.e. by disturbance degree corresponding to each voltage threshold during calculating temporarily drop and its duration, maximum is chosen to weigh
Measure the voltage dip order of severity.The index has also taken into account duration and amplitude while actual waveform feature is considered
Influence, temporarily drop seriousness can be portrayed more comprehensively, exactly.
In addition, voltage dip order of severity evaluation method of the invention can also be to the temporary drop order of severity of node voltage
Assessed.Specifically, the order of severity temporarily drops in the node total voltage that can obtain all previous voltage dip event of individual node respectively；
The average value that the node total voltage of all previous voltage dip event of the individual node is temporarily dropped to the order of severity is temporary as the voltage
The order of severity temporarily drops in the node average voltage of drop event.
Because temporarily drop event may occur repeatedly for individual node, therefore, with the voltage dip combined influence degree of single event
Based on index, in one embodiment, the voltage dip seriousness assessment that index is used for individual node can be defined as follows：
The node total voltage of r-th of node temporarily drops the order of severity and is expressed as follows：
The node average voltage of r-th of node temporarily drops the order of severity and is expressed as follows：
N in formularTotal temporarily drop number that r-th of node occurs in expression system, MrRepresent NrThe number that middle three-phase temporarily drops；Dl
Represent that the voltage dip disturbance degree of event temporarily drops in the l times single-phase/two-phase, can be by the single event voltage dip order of severity
D is calculated；D3,lRepresent that the disturbance degree of event temporarily drops in the l times three-phase, the D in the single event voltage dip order of severity can be passed through3Meter
Calculate.
In addition, voltage dip order of severity detection method of the invention can also be temporary to user class and system step voltage
The drop order of severity is assessed.Specifically, the order of severity temporarily drops in the node total voltage that can obtain each node respectively；According to each
The order of severity temporarily drops in the node total voltage of individual node and the user of the quantity calculating voltage dip event of destination node puts down
The equal voltage dip order of severity；Wherein, the destination node is the node that voltage dip event occurs；According to the section of each node
The order of severity temporarily drops in point total voltage and serious journey temporarily drops in the system average voltage of the node total number calculating voltage dip event
Degree.
A usual system includes multiple nodes, thus temporarily drops seriousness for the system voltage with m node and comment
Estimate and can be defined as follows index：
The order of severity temporarily drops in user's average voltage：
The order of severity temporarily drops in system average voltage：
In formula, ASDC is that the order of severity temporarily drops in user's average voltage, and ASDS is that the order of severity temporarily drops in system average voltage,
SDrThe order of severity, N temporarily drop in the node total voltage for r-th of noderThe total degree of voltage dip event occurs for r-th of node,
MrThe total degree of three-phase voltage sag event, D occur for r-th of nodelFor the l times single-phase voltage, event or two-phase voltage temporarily drop
The temporarily voltage dip disturbance degree of drop event, D3,lFor the voltage dip disturbance degree of the l times three-phase voltage sag event, NCFor system
Targeted customer's number of temporarily drop event occurs for interior each node, i.e., all numbers of users temporarily dropped, N occur under each nodeSAlways used for system
Amount, m are the node total number in system.
Illustrate the technique effect of the present invention below by way of an embodiment.
Certain urban distribution network electric energy quality monitoring system is chosen on 2 29th, 2,012 15:59:39 certain voltage occurred are temporary
The actual waveform of drop event calculates its combined influence degree index as shown in fig. 6, by taking this voltage dip event as an example.
Temporary drop event shown in Fig. 6, this event are that two-phase temporarily drops, the disturbance degree calculation formula temporarily dropped from two-phase,
Voltage dip multi thresholds are described in method, to voltage threshold 0.9,0.8,0.7,0.6,0.5,0.4,0.3,0.2,0.1, are calculated each
(0.7 ... ..., T (0.1), result of calculation are by the voltage dip duration T (0.9) of threshold value mapping, T (0.8), T：0.0633s、
0.0448s, 0.0204s, 0s, 0s, 0s, 0s, 0s, 0s, when the sequence is more temporarily drop threshold values corresponding to this event and is lasting
Between sequence.Calculate this it is temporary drop threshold value and duration time sequence corresponding to influence angle value, as a result for：0.0711、0.0645、
0.0971st, 0,0,0,0,0,0, based on above-mentioned result of calculation, the consideration that can finally obtain corresponding to the temporary drop event temporarily drop type with
The single voltage dip order of severity of the voltage dip order of severity evaluation method of multi thresholds description is 0.0971.
In description method temporarily drops in conventional voltage, according to Fig. 6, it is 0.6989 that can obtain voltage dip amplitude, and voltage dip is held
The continuous time is 0.0600s, and the single voltage dip order of severity of calculating is 0.1111.
Fig. 6 is typical non-rectangle waveform, however, being 0.6989 rectangle for being 0.0600s with the duration for amplitude
The temporary drop event of ripple type, the single voltage dip order of severity described using traditional description method with multi thresholds obtained by method are equal
For 0.1111, the result is identical with the influence angle value calculated using traditional description method in Fig. 6 obtained by temporary drop event, relatively using
The single voltage dip order of severity 0.0971 that invention multi thresholds describe method calculating is big, thus, according to traditional description method meter
The temporary drop event order of severity for the both types that the single voltage dip order of severity of calculation is reflected is identical, and according to multi thresholds
The single voltage dip order of severity that description method calculates, the temporary drop event of square wave type are temporary compared with non-rectangle wave voltage in Fig. 6
Drop event is more serious, and the result more tallies with the actual situation.Thus illustrate, the single voltage of method calculating is described using multi thresholds
Temporarily drop severity can avoid that the temporary drop event of non-rectangle type is caused excessively to assess, and its assessment result is relatively using biography
Description method of uniting is more reasonable.
Type and the voltage dip order of severity comprehensive assessment of multi thresholds description temporarily drop in a kind of consideration proposed by the invention
Method, major advantage are to consider the sensitive equipment tolerance curves under different temporarily drop types, can more accurately reflect list
The voltage dip order of severity under type Bu Tong temporarily drops in phase/two-phase and three-phase；Using more temporarily drop threshold values and duration time sequence
Description method instead of traditional voltage dip describing mode, can more accurately portray the actual waveform that reflecting voltage temporarily drops
Feature；Multi thresholds describing mode is combined with weight function, proposes commented suitable for single event, node and system respectively
The combined influence degree index estimated, available for the accurate assessment of voltage dip, it effectively prevent the excessive assessment in existing index, owe
The problem of estimation.
Type and the voltage dip order of severity comprehensive assessment side of multi thresholds description are temporarily dropped by a kind of consideration of the present invention
Method, the order of severity that voltage dip event conveniently and effectively single incident, node and system can occur accurately are commented
Estimate.
As shown in fig. 7, the present invention also provides a kind of voltage dip order of severity evaluation system, it may include：
First computing module 10, for calculating the weights letter of voltage dip performance impact degree according to voltage dip tolerance curve
Number, voltage dip disturbance degree is calculated according to the weight function；Wherein, the voltage dip disturbance degree represents voltage dip event
The order of severity；
Second computing module 20, for being calculated respectively pair according to the measurement voltage value of each sampled point during voltage dip
The time parameter of sampled point is answered, the time parameter of each sampled point is substituted into the voltage dip disturbance degree respectively, is obtained correspondingly
The single voltage dip performance parameter of sampled point；
Setup module 30, for the maximum in voltage dip performance parameter to be set to the single voltage of voltage dip event
The temporarily drop order of severity.
The voltage dip order of severity evaluation method one of the voltage dip order of severity evaluation system of the present invention and the present invention
One correspondence, the technical characteristic illustrated in the embodiment of above-mentioned voltage dip order of severity evaluation method and its advantage are applicable
In the embodiment of voltage dip order of severity evaluation system, hereby give notice that.
Expression or logic and/or step described otherwise above herein in flow charts, for example, being considered use
In the order list for the executable instruction for realizing logic function, may be embodied in any computer-readable medium, for
Instruction execution system, device or equipment (such as computer based system including the system of processor or other can be held from instruction
The system of row system, device or equipment instruction fetch and execute instruction) use, or combine these instruction execution systems, device or set
It is standby and use.For the purpose of this specification, " computer-readable medium " can any can be included, store, communicate, propagate or pass
Defeated program is for instruction execution system, device or equipment or the dress used with reference to these instruction execution systems, device or equipment
Put.
The more specifically example (non-exhaustive list) of computer-readable medium includes following：Connected up with one or more
Electrical connection section (electronic installation), portable computer diskette box (magnetic device), random access memory (RAM), read-only storage
(ROM), erasable edit read-only storage (EPROM or flash memory), fiber device, and portable optic disk is read-only deposits
Reservoir (CDROM).In addition, computer-readable medium, which can even is that, to print the paper of described program thereon or other are suitable
Medium, because can then enter edlin, interpretation or if necessary with it for example by carrying out optical scanner to paper or other media
His suitable method is handled electronically to obtain described program, is then stored in computer storage.
It should be appreciated that each several part of the present invention can be realized with hardware, software, firmware or combinations thereof.Above-mentioned
In embodiment, software that multiple steps or method can be performed in memory and by suitable instruction execution system with storage
Or firmware is realized.If, and in another embodiment, can be with well known in the art for example, realized with hardware
Any one of row technology or their combination are realized：With the logic gates for realizing logic function to data-signal
Discrete logic, have suitable combinational logic gate circuit application specific integrated circuit, programmable gate array (PGA), scene
Programmable gate array (FPGA) etc..
In the description of this specification, reference term " one embodiment ", " some embodiments ", " example ", " specifically show
The description of example " or " some examples " etc. means specific features, structure, material or the spy for combining the embodiment or example description
Point is contained at least one embodiment or example of the present invention.In this manual, to the schematic representation of above-mentioned term not
Necessarily refer to identical embodiment or example.Moreover, specific features, structure, material or the feature of description can be any
One or more embodiments or example in combine in an appropriate manner.
Each technical characteristic of embodiment described above can be combined arbitrarily, to make description succinct, not to above-mentioned reality
Apply all possible combination of each technical characteristic in example to be all described, as long as however, the combination of these technical characteristics is not deposited
In contradiction, the scope that this specification is recorded all is considered to be.
Embodiment described above only expresses the several embodiments of the present invention, and its description is more specific and detailed, but simultaneously
Can not therefore it be construed as limiting the scope of the patent.It should be pointed out that come for one of ordinary skill in the art
Say, without departing from the inventive concept of the premise, various modifications and improvements can be made, these belong to the protection of the present invention
Scope.Therefore, the protection domain of patent of the present invention should be determined by the appended claims.
Claims (10)
1. a kind of voltage dip order of severity evaluation method, it is characterised in that comprise the following steps：
The weight function of voltage dip performance impact degree is calculated according to voltage dip tolerance curve, is calculated according to the weight function
Voltage dip disturbance degree；Wherein, the voltage dip disturbance degree represents the order of severity of voltage dip event；
Calculate the time parameter of corresponding sampled point respectively according to the measurement voltage value of each sampled point during voltage dip, respectively
The time parameter of each sampled point is substituted into the voltage dip disturbance degree, obtains the single voltage dip performance of corresponding sampled point
Parameter；
The maximum in voltage dip performance parameter is set to the single voltage dip order of severity of voltage dip event.
2. voltage dip order of severity evaluation method according to claim 1, it is characterised in that be resistant to according to voltage dip
The step of weight function of curve calculating voltage dip performance impact degree, includes：
Obtain the trip point of the voltage dip tolerance curve；
Maximum and minimum in the trip point calculate the control parameter of the weight function；
The weight function is determined according to the control parameter.
3. voltage dip order of severity evaluation method according to claim 1, it is characterised in that according to the weight function
The step of calculating voltage dip disturbance degree includes：
Event is temporarily dropped for the temporary drop event of single-phase voltage or two-phase voltage, voltage dip disturbance degree is calculated according to following manner：
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In formula, MTD (U, T) is that the voltage dip disturbance degree that event temporarily drops in event or two-phase voltage temporarily drops in single-phase voltage, and MD (U) is
Voltage dip disturbance degree corresponding to the voltage dip amplitude of event temporarily drops in single-phase voltage temporarily drop event or two-phase voltage, and TD (T) is
Voltage dip disturbance degree corresponding to the voltage dip duration of event temporarily drops in single-phase voltage temporarily drop event or two-phase voltage.
4. voltage dip order of severity evaluation method according to claim 3, it is characterised in that according to the weight function
The step of calculating voltage dip disturbance degree includes：
For three-phase voltage sag event, voltage dip disturbance degree is calculated according to following manner：
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<mi>MD</mi>
<mn>3</mn>
</msub>
<msup>
<mrow>
<mo>(</mo>
<mi>U</mi>
<mo>)</mo>
</mrow>
<mn>2</mn>
</msup>
<mo>+</mo>
<msub>
<mi>TD</mi>
<mn>3</mn>
</msub>
<msup>
<mrow>
<mo>(</mo>
<mi>T</mi>
<mo>)</mo>
</mrow>
<mn>2</mn>
</msup>
</mrow>
<mn>2</mn>
</mfrac>
</msqrt>
<mo>;</mo>
</mrow>
In formula, MTD3(U, T) is voltage dip disturbance degree, MD3(U) it is corresponding for the voltage dip amplitude of three-phase voltage sag event
Voltage dip disturbance degree, TD3(T) influenceed for voltage dip corresponding to the voltage dip duration of three-phase voltage sag event
Degree.
5. voltage dip order of severity evaluation method according to claim 4, it is characterised in that further comprising the steps of：
The order of severity temporarily drops in the node total voltage for obtaining all previous voltage dip event of individual node respectively；
The node total voltage of all previous voltage dip event of the individual node is temporarily dropped into the average value of the order of severity as the electricity
The order of severity temporarily drops in the node average voltage that event temporarily drops in pressure.
6. voltage dip order of severity evaluation method according to claim 5, it is characterised in that obtain individual node respectively
The step of order of severity temporarily drops in the node total voltage of all previous voltage dip event includes：
The order of severity temporarily drops in the node total voltage that individual node is calculated according to following manner：
<mrow>
<msub>
<mi>SD</mi>
<mi>r</mi>
</msub>
<mo>=</mo>
<munderover>
<mo>&Sigma;</mo>
<mrow>
<mi>l</mi>
<mo>=</mo>
<mn>1</mn>
</mrow>
<mrow>
<mi>N</mi>
<mo>-</mo>
<msub>
<mi>M</mi>
<mi>r</mi>
</msub>
</mrow>
</munderover>
<msub>
<mi>D</mi>
<mi>l</mi>
</msub>
<mo>+</mo>
<munderover>
<mo>&Sigma;</mo>
<mrow>
<mn>1</mn>
<mo>=</mo>
<msub>
<mi>M</mi>
<mi>r</mi>
</msub>
</mrow>
<msub>
<mi>N</mi>
<mi>r</mi>
</msub>
</munderover>
<msub>
<mi>D</mi>
<mrow>
<mn>3</mn>
<mo>,</mo>
<mi>l</mi>
</mrow>
</msub>
<mo>;</mo>
</mrow>
In formula, SDrThe order of severity, N temporarily drop in the node total voltage for r-th of noderVoltage dip event occurs for r-th of node
Total degree, MrThe total degree of three-phase voltage sag event, D occur for r-th of nodelFor the l times single-phase voltage temporarily drop event or
The voltage dip disturbance degree of event, D temporarily drop in two-phase voltage3,lFor the voltage dip disturbance degree of the l times three-phase voltage sag event.
7. voltage dip order of severity evaluation method according to claim 1, it is characterised in that further comprising the steps of：
The order of severity temporarily drops in the node total voltage for obtaining each node respectively；
The quantity that the order of severity and destination node are temporarily dropped according to the node total voltage of each node calculates the voltage dip thing
The order of severity temporarily drops in user's average voltage of part；Wherein, the destination node is the node that voltage dip event occurs；
It is according to what the node total voltage of each node temporarily dropped that the order of severity and node total number calculate the voltage dip event
The order of severity temporarily drops in system average voltage.
8. voltage dip order of severity evaluation method according to claim 7, it is characterised in that according to the section of each node
The order of severity temporarily drops in point total voltage and user's average voltage of the quantity calculating voltage dip event of destination node temporarily drops
The step of order of severity, includes：
User's average voltage is calculated according to following manner and temporarily drops the order of severity：
<mrow>
<mi>A</mi>
<mi>S</mi>
<mi>D</mi>
<mi>C</mi>
<mo>=</mo>
<mfrac>
<mrow>
<munderover>
<mo>&Sigma;</mo>
<mrow>
<mi>r</mi>
<mo>=</mo>
<mn>1</mn>
</mrow>
<mi>m</mi>
</munderover>
<mrow>
<mo>(</mo>
<munderover>
<mo>&Sigma;</mo>
<mrow>
<mi>l</mi>
<mo>=</mo>
<mn>1</mn>
</mrow>
<mrow>
<msub>
<mi>N</mi>
<mi>r</mi>
</msub>
<mo>-</mo>
<msub>
<mi>M</mi>
<mi>r</mi>
</msub>
</mrow>
</munderover>
<msub>
<mi>D</mi>
<mi>l</mi>
</msub>
<mo>+</mo>
<munderover>
<mo>&Sigma;</mo>
<mrow>
<mi>l</mi>
<mo>=</mo>
<msub>
<mi>M</mi>
<mi>r</mi>
</msub>
</mrow>
<mi>N</mi>
</munderover>
<msub>
<mi>D</mi>
<mrow>
<mn>3</mn>
<mo>,</mo>
<mi>l</mi>
</mrow>
</msub>
<mo>)</mo>
</mrow>
</mrow>
<msub>
<mi>N</mi>
<mi>C</mi>
</msub>
</mfrac>
<mo>=</mo>
<mfrac>
<mrow>
<munderover>
<mo>&Sigma;</mo>
<mrow>
<mi>r</mi>
<mo>=</mo>
<mn>1</mn>
</mrow>
<mi>m</mi>
</munderover>
<msub>
<mi>SD</mi>
<mi>r</mi>
</msub>
</mrow>
<msub>
<mi>N</mi>
<mi>C</mi>
</msub>
</mfrac>
<mo>;</mo>
</mrow>
In formula, ASDC is that the order of severity, SD temporarily drop in user's average voltagerSerious journey temporarily drops in the node total voltage for r-th of node
Degree, NrThe total degree of voltage dip event, M occur for r-th of noderThe total of three-phase voltage sag event occurs for r-th of node
Number, DlFor the l times single-phase voltage, the voltage dip disturbance degree that event temporarily drops in event or two-phase voltage, D temporarily drop3,lFor the l times three
The voltage dip disturbance degree of phase voltage sag event, NCFor targeted customer's number in system, m is the node total number in system.
9. voltage dip order of severity evaluation method according to claim 7, it is characterised in that according to the section of each node
The order of severity temporarily drops in point total voltage and serious journey temporarily drops in the system average voltage of the node total number calculating voltage dip event
The step of spending includes：
The system average voltage is calculated according to following manner and temporarily drops the order of severity：
<mrow>
<mi>A</mi>
<mi>S</mi>
<mi>D</mi>
<mi>S</mi>
<mo>=</mo>
<mfrac>
<mrow>
<munderover>
<mo>&Sigma;</mo>
<mrow>
<mi>r</mi>
<mo>=</mo>
<mn>1</mn>
</mrow>
<mi>m</mi>
</munderover>
<mrow>
<mo>(</mo>
<munderover>
<mo>&Sigma;</mo>
<mrow>
<mi>l</mi>
<mo>=</mo>
<mn>1</mn>
</mrow>
<mrow>
<msub>
<mi>N</mi>
<mi>r</mi>
</msub>
<mo>-</mo>
<msub>
<mi>M</mi>
<mi>r</mi>
</msub>
</mrow>
</munderover>
<msub>
<mi>D</mi>
<mi>l</mi>
</msub>
<mo>+</mo>
<munderover>
<mo>&Sigma;</mo>
<mrow>
<mi>l</mi>
<mo>=</mo>
<msub>
<mi>M</mi>
<mi>r</mi>
</msub>
</mrow>
<mi>N</mi>
</munderover>
<msub>
<mi>D</mi>
<mrow>
<mn>3</mn>
<mo>,</mo>
<mi>l</mi>
</mrow>
</msub>
<mo>)</mo>
</mrow>
</mrow>
<msub>
<mi>N</mi>
<mi>S</mi>
</msub>
</mfrac>
<mo>=</mo>
<mfrac>
<mrow>
<munderover>
<mo>&Sigma;</mo>
<mrow>
<mi>r</mi>
<mo>=</mo>
<mn>1</mn>
</mrow>
<mi>m</mi>
</munderover>
<msub>
<mi>SD</mi>
<mi>r</mi>
</msub>
</mrow>
<msub>
<mi>N</mi>
<mi>S</mi>
</msub>
</mfrac>
<mo>;</mo>
</mrow>
In formula, ASDS is that the order of severity, SD temporarily drop in system average voltagerSerious journey temporarily drops in the node total voltage for r-th of node
Degree, NrThe total degree of voltage dip event, M occur for r-th of noderThe total of three-phase voltage sag event occurs for r-th of node
Number, DlFor the l times single-phase voltage, the voltage dip disturbance degree that event temporarily drops in event or two-phase voltage, D temporarily drop3,lFor the l times three
The voltage dip disturbance degree of phase voltage sag event, NSFor the total number of users of system, m is the node total number in system.
A kind of 10. voltage dip order of severity evaluation system, it is characterised in that including：
First computing module, for calculating the weight function of voltage dip performance impact degree, root according to voltage dip tolerance curve
Voltage dip disturbance degree is calculated according to the weight function；Wherein, the voltage dip disturbance degree represents the tight of voltage dip event
Weight degree；
Second computing module, for calculating corresponding sampling respectively according to the measurement voltage value of each sampled point during voltage dip
The time parameter of point, the time parameter of each sampled point is substituted into the voltage dip disturbance degree respectively, obtain corresponding sampled point
Single voltage dip performance parameter；
Setup module, the single voltage dip for the maximum in voltage dip performance parameter to be set to voltage dip event are tight
Weight degree.
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