CN102928703A - Method and system for measuring short-time flicker - Google Patents

Abstract

The invention discloses a method and a system for measuring short-time flicker. The method comprises the following steps of: obtaining instantaneous flicker values within a preset time; classifying the instantaneous flicker values, wherein each grade corresponds to one values of the instantaneous flicker values; recording the number of the instantaneous flicker values under each grade; according to the grade and the number of the instantaneous flicker values under each grade, confirming the five instantaneous flicker values which are just less than 0.1%, 1%, 3%, 10% and 50% in all the instantaneous flicker values; and computing the short-time flicker within the preset time according to a formula. After the method or the system provided by the invention is adopted, the data size which needs to be stored in the process of computation can be reduced, the computation process of the short-time flicker can be supported by a mini type computation system, the computation process can be simplified, and the short-time flicker value can be timely obtained.

Description

A kind of method and system of measuring Short Term Flicker

Technical field

The present invention relates to field of power, particularly relate to a kind of method and system of measuring Short Term Flicker.

Background technology

Voltage fluctuation causes the human eye visual sense reaction of lamp illuminance unstable (light flash) to be called flickering.In other words, flickering has reflected the impact that light flash that voltage fluctuation causes produces people's visual sense.Short Term Flicker value (short term severity, Pst) is to weigh a statistics value of short time (some minutes) interior flickering power.Usually, Pst=1 is that flickering causes the irritating limit value of visual sense.Because Short Term Flicker is the result that voltage fluctuation causes in the short time, so, measure Short Term Flicker and can obtain interior voltage fluctuation situation of corresponding time.

Need to prove, voltage flicker is different from common voltage fluctuation.At first, voltage flicker refers to a kind ofly on the voltage waveform rise fast and descend, and the effective value that fluctuation refers to voltage with the frequency that is lower than power frequency fast or continuously change.The characteristics of voltage flicker are UHV (ultra-high voltage), Instantaneous State and high frequency time.If understand from waveform intuitively, the fluctuation of voltage can cause the distortion of waveform, and is asymmetric, and the variation of adjacent peak value etc., but squiggle be smooth continuously, and flickering main be burr and the interruption that causes waveform.

Now in the prior art, measure the method for Short Term Flicker and carry out brief description.At first, all instantaneous flicker values of record 0-t time (can be the flickering value that each sampling obtains) S(p.u.), obtain Fig. 1.Fig. 1 is instantaneous flicker value time history plot.Then to S(p.u.) carry out classification.For example among the figure one according to S(p.u.) value divided ten grades, i.e. S(t among Fig. 1).Add up respectively again the S(p.u. more than or equal to certain one-level) lasting temporal summation, for example the temporal summation more than or equal to the 5th grade is among Fig. 1

To more than or equal to the temporal summation of every one-level divided by total time t, obtain accounting for more than or equal to the temporal summation of every one-level the ratio CFP of T.T. respectively again _i, obtain Fig. 2.Fig. 2 accounts for the scale map of T.T. for the duration more than or equal to the flickering value of each grade.Find CPF according to Fig. 2 again _0.1, CPF ₁, CPF ₃, CPF ₁₀, CPF ₅₀The S(p.u. that difference is corresponding).Wherein, CFP _0.1It is 0.1% that expression accounts for the ratio of T.T..At last according to formula $P_{\mathrm{st}}=\sqrt{0.0314P_{0.1}+0.0525{\mathrm{<figure-callout\; id="1"\; label="P"\; filenames="HDA00002314432700012.png"\; state="\{\{state\}\}">P</figure-callout>}}_1+0.0657{\mathrm{<figure-callout\; id="3"\; label="P"\; filenames="HDA00002314432700012.png"\; state="\{\{state\}\}">P</figure-callout>}}_3+0.28{\mathrm{<figure-callout\; id="10"\; label="P"\; filenames="HDA00002314432700012.png"\; state="\{\{state\}\}">P</figure-callout>}}_{10}+0.08{\mathrm{<figure-callout\; id="50"\; label="P"\; filenames="HDA00002314432700012.png"\; state="\{\{state\}\}">P</figure-callout>}}_{50}},$ Calculate Short Term Flicker.In the above-mentioned formula, P _StThe expression Short Term Flicker, P _0.1When being 0.1% for the ratio that accounts for T.T., corresponding S(p.u. among Fig. 2) value.

There is following problems in the method for measuring Short Term Flicker in the prior art: owing to calculating the data that flickering will be added up some minutes.To sample 10 minutes, the per second sampling is example 400 times, the data volume that method of the prior art will be stored is very large, reaches (1.2*10*60*400=288000 word), causes the data space of small-sized computing system (for example single-chip microcomputer) to be not enough to support the measuring process of whole Short Term Flicker.And in the prior art, the data sectional that also needs to carry out among Fig. 1 is processed, and carries out a large amount of comparative statistics and calculates, and also needs to draw Fig. 2 by the result of calculation of Fig. 1, finally obtains CPF _0.1, CPF ₁, CPF ₃, CPF ₁₀, CPF ₅₀Corresponding S (p.u.), corresponding relation is complicated, and calculated amount is large, and then causes time of calculating longer, can't obtain in real time the Short Term Flicker value.

Summary of the invention

The purpose of this invention is to provide a kind of method and system of measuring Short Term Flicker, can reduce and need the data volume of storing in the computation process, make small-sized computing system can support the computation process of Short Term Flicker, and simplify computation process, can obtain in real time the Short Term Flicker value.

For achieving the above object, the invention provides following scheme:

A kind of method of measuring Short Term Flicker comprises:

In Preset Time, obtain the instantaneous flicker value;

Described instantaneous flicker value is carried out classification, and each rank is corresponding to a value of instantaneous flicker value;

Record the number of the described instantaneous flicker value under each rank;

According to described rank, and the number of the described instantaneous flicker value under each rank, just determine five instantaneous flicker values less than 0.1%, 1%, 3%, 10%, 50% in whole instantaneous flicker values;

According to formula $P_{\mathrm{st}}=\sqrt{0.0314P_{0.1}+0.0525{\mathrm{<figure-callout\; id="1"\; label="P"\; filenames="HDA00002314432700012.png"\; state="\{\{state\}\}">P</figure-callout>}}_1+0.0657{\mathrm{<figure-callout\; id="3"\; label="P"\; filenames="HDA00002314432700012.png"\; state="\{\{state\}\}">P</figure-callout>}}_3+0.28{\mathrm{<figure-callout\; id="10"\; label="P"\; filenames="HDA00002314432700012.png"\; state="\{\{state\}\}">P</figure-callout>}}_{10}+0.08{\mathrm{<figure-callout\; id="50"\; label="P"\; filenames="HDA00002314432700012.png"\; state="\{\{state\}\}">P</figure-callout>}}_{50}},$ Calculate the Short Term Flicker in the described Preset Time;

Wherein, P _StRepresent the Short Term Flicker value in the described Preset Time, P _0.1Expression is just less than the instantaneous flicker value of 0.1% in whole instantaneous flicker values, P ₁Expression is just less than the instantaneous flicker value of 1% in whole instantaneous flicker values, P ₃Expression is just less than the instantaneous flicker value of 3% in whole instantaneous flicker values, P ₁₀Expression is just less than the instantaneous flicker value of 10% in whole instantaneous flicker values, P ₅₀Expression is just less than the instantaneous flicker value of 50% in whole instantaneous flicker values.

Optionally, described described instantaneous flicker value is carried out classification, comprising:

Described instantaneous flicker is on duty with predefined quantizing factor, the instantaneous flicker value after obtaining rounding;

Judge that whether instantaneous flicker value after described the rounding is greater than default value;

If so, then described instantaneous flicker value is included into the rank corresponding with described default value;

Otherwise, described instantaneous flicker value is included into the rank corresponding with the instantaneous flicker value after described the rounding.

Optionally, described definite just less than five instantaneous flicker values of 0.1%, 1%, 3%, 10%, 50% in whole instantaneous flicker values, comprising:

According to described rank, and the number of the described instantaneous flicker value under each rank, according to instantaneous flicker value order from big to small corresponding to each rank, determine serial number range corresponding to described each rank;

Total number of instantaneous flicker value be multiply by respectively 0.1%, 1%, 3%, 10%, 50%, obtain five numerical value;

Determine five sequence numbers just greater than described five numerical value;

Determine described five ranks that sequence number is corresponding;

Instantaneous flicker value in the rank that described five sequence numbers are corresponding just is defined as five instantaneous flicker values less than 0.1%, 1%, 3%, 10%, 50% in whole instantaneous flicker values.

A kind of system of measuring Short Term Flicker comprises:

Instantaneous flicker value acquiring unit is used for obtaining the instantaneous flicker value in Preset Time;

Stage unit is used for described instantaneous flicker value is carried out classification, and each rank is corresponding to a value of instantaneous flicker value;

The number record cell is for the number of the described instantaneous flicker value under each rank of record;

Critical instantaneous flicker value determining unit is used for according to described rank, and the number of the described instantaneous flicker value under each rank, just determines five instantaneous flicker values less than 0.1%, 1%, 3%, 10%, 50% in whole instantaneous flicker values;

The Short Term Flicker computing unit is used for according to formula $P_{\mathrm{st}}=\sqrt{0.0314P_{0.1}+0.0525{\mathrm{<figure-callout\; id="1"\; label="P"\; filenames="HDA00002314432700012.png"\; state="\{\{state\}\}">P</figure-callout>}}_1+0.0657{\mathrm{<figure-callout\; id="3"\; label="P"\; filenames="HDA00002314432700012.png"\; state="\{\{state\}\}">P</figure-callout>}}_3+0.28{\mathrm{<figure-callout\; id="10"\; label="P"\; filenames="HDA00002314432700012.png"\; state="\{\{state\}\}">P</figure-callout>}}_{10}+0.08{\mathrm{<figure-callout\; id="50"\; label="P"\; filenames="HDA00002314432700012.png"\; state="\{\{state\}\}">P</figure-callout>}}_{50}},$ Calculate the Short Term Flicker in the described Preset Time;

Wherein, P _StRepresent the Short Term Flicker value in the described Preset Time, P _0.1Expression is just less than the instantaneous flicker value of 0.1% in whole instantaneous flicker values, P ₁Expression is just less than the instantaneous flicker value of 1% in whole instantaneous flicker values, P ₃Expression is just less than the instantaneous flicker value of 3% in whole instantaneous flicker values, P ₁₀Expression is just less than the instantaneous flicker value of 10% in whole instantaneous flicker values, P ₅₀Expression is just less than the instantaneous flicker value of 50% in whole instantaneous flicker values.

Optionally, described stage unit comprises:

Round subelement, for described instantaneous flicker is on duty with predefined quantizing factor, the instantaneous flicker value after obtaining rounding;

Judgment sub-unit is used for judging that whether instantaneous flicker value after described the rounding is greater than default value;

The first classification subelement, be used for when the judged result of described judgment sub-unit when being, described instantaneous flicker value is included into the rank corresponding with described default value;

The second classification subelement is used for when described judgment sub-unit when the determination result is NO described instantaneous flicker value being included into the rank corresponding with the instantaneous flicker value after described the rounding.

Optionally, described critical instantaneous flicker value determining unit comprises:

Serial number range is determined subelement, is used for according to described rank, and the number of the described instantaneous flicker value under each rank, according to instantaneous flicker value order from big to small corresponding to each rank, determine serial number range corresponding to described each rank;

Numerical value is determined subelement, is used for total number of instantaneous flicker value be multiply by respectively 0.1%, 1%, 3%, 10%, 50%, obtains five numerical value;

Sequence number is determined subelement, is used for definite five sequence numbers just greater than described five numerical value;

Rank is determined subelement, is used for determining described five ranks that sequence number is corresponding;

Critical instantaneous flicker value is determined subelement, is used for the instantaneous flicker value of the rank that described five sequence numbers are corresponding, just is defined as five instantaneous flicker values less than 0.1%, 1%, 3%, 10%, 50% in whole instantaneous flicker values.

According to specific embodiment provided by the invention, the invention discloses following technique effect:

The method and system of measurement Short Term Flicker provided by the present invention are by obtaining the instantaneous flicker value; Described instantaneous flicker value is carried out classification, record the number of the described instantaneous flicker value under each rank, can only store at data space the number of the described instantaneous flicker value under each rank, and need not as in the prior art, store the data that all samplings obtain, need the data volume of storing in the computation process so can reduce; And, in this programme, according to described rank, and the number of the described instantaneous flicker value under each rank, definite just less than five instantaneous flicker values of 0.1%, 1%, 3%, 10%, 50% in whole instantaneous flicker values, substituted and obtained CPF in the prior art _0.1, CPF ₁, CPF ₃, CPF ₁₀, CPF ₅₀Therefore the process (relating to the comparison and statistics of total data in this process) of corresponding S (p.u.) value has simplified computation process, can obtain in real time the Short Term Flicker value.

Description of drawings

In order to be illustrated more clearly in the embodiment of the invention or technical scheme of the prior art, the below will do to introduce simply to the accompanying drawing of required use among the embodiment, apparently, accompanying drawing in the following describes only is some embodiments of the present invention, for those of ordinary skills, under the prerequisite of not paying creative work, can also obtain according to these accompanying drawings other accompanying drawing.

Fig. 1 is instantaneous flicker value time history plot;

Fig. 2 accounts for the scale map of T.T. for the duration more than or equal to the flickering value of each grade;

Fig. 3 is the process flow diagram of the embodiment of the method for measurement Short Term Flicker of the present invention;

Fig. 4 is the process flow diagram that in the method for the present invention described instantaneous flicker value is carried out classification;

Fig. 5 is in the method for the present invention, just determines the process flow diagram less than five instantaneous flicker values of 0.1%, 1%, 3%, 10%, 50% in whole instantaneous flicker values;

Fig. 6 is the structural drawing of the system embodiment of measurement Short Term Flicker of the present invention;

Fig. 7 is the structural drawing of stage unit of the system of measurement Short Term Flicker of the present invention;

Fig. 8 is the structural drawing of critical instantaneous flicker value determining unit of the system of measurement Short Term Flicker of the present invention.

Embodiment

Below in conjunction with the accompanying drawing in the embodiment of the invention, the technical scheme in the embodiment of the invention is clearly and completely described, obviously, described embodiment only is the present invention's part embodiment, rather than whole embodiment.Based on the embodiment among the present invention, those of ordinary skills belong to the scope of protection of the invention not making the every other embodiment that obtains under the creative work prerequisite.

For above-mentioned purpose of the present invention, feature and advantage can be become apparent more, the present invention is further detailed explanation below in conjunction with the drawings and specific embodiments.

Fig. 3 is the process flow diagram of the embodiment of the method for measurement Short Term Flicker of the present invention.As shown in Figure 3, described method comprises:

Step 301: in Preset Time, obtain the instantaneous flicker value;

Preset Time can be some minutes, for example 10 minutes.The instantaneous flicker value can refer to each flickering value that voltage is sampled and obtained.Concrete, can comprise following process for obtaining of instantaneous flicker value: by AD conversion unit the voltage of input measurement unit is converted into digital quantity, carries out digital filtering, obtain corresponding instantaneous flicker value (val).It can be p.s. 400 times for the sample frequency of instantaneous flicker value.

Step 302: described instantaneous flicker value is carried out classification, and each rank is corresponding to a value of instantaneous flicker value;

Because the sample frequency in the step 101 is very high, and the sampled value of instantaneous flicker value usually concentrates within the specific limits, so can carry out classification to described instantaneous flicker value.For example, in the time of between the sampled value scope of instantaneous flicker value concentrates on 0 to 1, just described instantaneous flicker value can be divided into 100 grades.

Step 303: the number that records the described instantaneous flicker value under each rank;

In the practical application, when sampling for the instantaneous flicker value, resolution is generally 0.01.That is to say, between 0 to 1, if be divided into 100 grades, then each actual acquire 0 to 1 between the lucky corresponding grade of sampled value.For example, the instantaneous flicker value is 0.01 o'clock, and corresponding to the 1st grade, the instantaneous flicker value is 0.99 o'clock, corresponding to the 99th grade.

Can be known by above-mentioned steps, when sample frequency is p.s. 400 times, sample 10 minutes, then can obtain 240000 instantaneous flicker values.These instantaneous flicker values can be divided to respectively in 100 grades, and then corresponding instantaneous flicker value is a plurality of in each grade.Number can record.

Step 304: according to described rank, and the number of the described instantaneous flicker value under each rank, determine five instantaneous flicker values just greater than 0.1%, 1%, 3%, 10%, 50% in whole instantaneous flicker values;

According to described rank, and the number of the described instantaneous flicker value under each rank, can know and comprise what instantaneous flicker values under each rank, because the value of rank and instantaneous flicker value is for concerning one to one, so also just can know the occurrence number of the instantaneous flicker value of each value.

P.s. 400 times with above-mentioned sample frequency, sample 10 minutes be example, altogether can obtain 240000 instantaneous flicker values.Instantaneous flicker value just greater than 0.1% in whole instantaneous flicker values refers to some instantaneous flicker values, and its value is less than 0.1% in 240000 instantaneous flicker values, namely less than 240 in 240000 instantaneous flicker values.In like manner, can determine four instantaneous flicker values just greater than 1%, 3%, 10%, 50% in whole instantaneous flicker values.

Step 305: according to formula $P_{\mathrm{st}}=\sqrt{0.0314P_{0.1}+0.0525{\mathrm{<figure-callout\; id="1"\; label="P"\; filenames="HDA00002314432700012.png"\; state="\{\{state\}\}">P</figure-callout>}}_1+0.0657{\mathrm{<figure-callout\; id="3"\; label="P"\; filenames="HDA00002314432700012.png"\; state="\{\{state\}\}">P</figure-callout>}}_3+0.28{\mathrm{<figure-callout\; id="10"\; label="P"\; filenames="HDA00002314432700012.png"\; state="\{\{state\}\}">P</figure-callout>}}_{10}+0.08{\mathrm{<figure-callout\; id="50"\; label="P"\; filenames="HDA00002314432700012.png"\; state="\{\{state\}\}">P</figure-callout>}}_{50}},$ Calculate the Short Term Flicker in the described Preset Time;

Wherein, P _StRepresent the Short Term Flicker value in the described Preset Time, P _0.1Expression is just greater than the instantaneous flicker value of 0.1% in whole instantaneous flicker values, P ₁Expression is just greater than the instantaneous flicker value of 1% in whole instantaneous flicker values, P ₃Expression is just greater than the instantaneous flicker value of 3% in whole instantaneous flicker values, P ₁₀Expression is just greater than the instantaneous flicker value of 10% in whole instantaneous flicker values, P ₅₀Expression is just greater than the instantaneous flicker value of 50% in whole instantaneous flicker values.

In sum, the method for the measurement Short Term Flicker that the embodiment of the invention provides is by obtaining the instantaneous flicker value; Described instantaneous flicker value is carried out classification, record the number of the described instantaneous flicker value under each rank, can only store at data space the number of the described instantaneous flicker value under each rank, and need not as in the prior art, store the data that all samplings obtain, need the data volume of storing in the computation process so can reduce; And, in this programme, according to described rank, and the number of the described instantaneous flicker value under each rank, definite just less than five instantaneous flicker values of 0.1%, 1%, 3%, 10%, 50% in whole instantaneous flicker values, substituted and obtained CPF in the prior art _0.1, CPF ₁, CPF ₃, CPF ₁₀, CPF ₅₀Therefore the process (relating to the comparison and statistics of total data in this process) of corresponding S (p.u.) value has simplified computation process, can obtain in real time the Short Term Flicker value.

Fig. 4 is the process flow diagram that in the method for the present invention described instantaneous flicker value is carried out classification.As shown in Figure 4, described flow process can comprise:

Step 401: described instantaneous flicker is on duty with predefined quantizing factor, the instantaneous flicker value after obtaining rounding;

Described quantizing factor can be set according to the resolving power to the sampling of instantaneous flicker value.For example, when the resolving power of the sampling of instantaneous flicker value was 0.01, quantizing factor can be made as 100.Like this, described instantaneous flicker is on duty with after the predefined quantizing factor, the instantaneous flicker value after can obtaining rounding.

Step 402: judge that whether instantaneous flicker value after described the rounding is greater than default value; If so, execution in step 403, otherwise, execution in step 404.

The purpose of this step is, the instantaneous flicker value that surpasses normal span that occurs under the individual cases is carried out amplitude limiting processing.In the above example, when the sampled value scope of instantaneous flicker value concentrates between 0 to 1, the resolving power of the sampling of instantaneous flicker value is 0.01, and when described instantaneous flicker value was divided into 100 grades, described default value can be made as 100.

Step 403: when the judged result of step 402 when being, described instantaneous flicker value is included into the rank corresponding with described default value;

For example, the instantaneous flicker value after rounding is 101, greater than 100 o'clock, then this instantaneous flicker value is included into the rank of 100 correspondences.

Step 404: when step 402 when the determination result is NO, described instantaneous flicker value is included into the rank corresponding with the instantaneous flicker value after described the rounding.

For example, the instantaneous flicker value after rounding is 99, less than 100 o'clock, then this instantaneous flicker value is included into the rank of 99 correspondences.

Fig. 5 is in the method for the present invention, just determines the process flow diagram less than five instantaneous flicker values of 0.1%, 1%, 3%, 10%, 50% in whole instantaneous flicker values.As shown in Figure 5, this flow process can comprise:

Step 501: according to described rank, and the number of the described instantaneous flicker value under each rank, according to instantaneous flicker value order from big to small corresponding to each rank, determine serial number range corresponding to described each rank;

For example, in the rank of 100 correspondences, the number of record is 10, and then other serial number range of level of 100 correspondences can be 1 to 10.In the rank of 99 correspondences, the number of record is 20, and then other serial number range of level of 99 correspondences can be 11 to 30.

Step 502: total number of instantaneous flicker value be multiply by respectively 0.1%, 1%, 3%, 10%, 50%, obtain five numerical value;

For example, 240000 multiply by 0.1% and can obtain 240.

Step 503: determine five sequence numbers just greater than described five numerical value;

Sequence number just greater than 240 is 241.

Step 504: determine described five ranks that sequence number is corresponding;

For example, determine the rank of 241 correspondences, for example other sequence number span of level of 98 correspondences is 31 to 300, and the rank that so just can determine 241 correspondences is 98.

Step 505: the instantaneous flicker value in the rank that described five sequence numbers are corresponding just is defined as five instantaneous flicker values less than 0.1%, 1%, 3%, 10%, 50% in whole instantaneous flicker values.

For example, the rank of 241 correspondences is 98, and the instantaneous flicker value of rank 98 correspondences is 0.98.Just so, just can determine the instantaneous flicker value 0.98 less than 0.1% in whole instantaneous flicker values.

The invention also discloses a kind of system of measuring Short Term Flicker.Fig. 6 is the structural drawing of the system embodiment of measurement Short Term Flicker of the present invention.As shown in Figure 6, described system can comprise:

Instantaneous flicker value acquiring unit 601 is used for obtaining the instantaneous flicker value in Preset Time;

Stage unit 602 is used for described instantaneous flicker value is carried out classification, and each rank is corresponding to a value of instantaneous flicker value;

Number record cell 603 is for the number of the described instantaneous flicker value under each rank of record;

Critical instantaneous flicker value determining unit 604 is used for according to described rank, and the number of the described instantaneous flicker value under each rank, just determines five instantaneous flicker values less than 0.1%, 1%, 3%, 10%, 50% in whole instantaneous flicker values;

Short Term Flicker computing unit 605 is used for according to formula $P_{\mathrm{st}}=\sqrt{0.0314P_{0.1}+0.0525{\mathrm{<figure-callout\; id="1"\; label="P"\; filenames="HDA00002314432700012.png"\; state="\{\{state\}\}">P</figure-callout>}}_1+0.0657{\mathrm{<figure-callout\; id="3"\; label="P"\; filenames="HDA00002314432700012.png"\; state="\{\{state\}\}">P</figure-callout>}}_3+0.28{\mathrm{<figure-callout\; id="10"\; label="P"\; filenames="HDA00002314432700012.png"\; state="\{\{state\}\}">P</figure-callout>}}_{10}+0.08{\mathrm{<figure-callout\; id="50"\; label="P"\; filenames="HDA00002314432700012.png"\; state="\{\{state\}\}">P</figure-callout>}}_{50}},$ Calculate the Short Term Flicker in the described Preset Time;

Wherein, P _StRepresent the Short Term Flicker value in the described Preset Time, P _0.1Expression is just less than the instantaneous flicker value of 0.1% in whole instantaneous flicker values, P ₁Expression is just less than the instantaneous flicker value of 1% in whole instantaneous flicker values, P ₃Expression is just less than the instantaneous flicker value of 3% in whole instantaneous flicker values, P ₁₀Expression is just less than the instantaneous flicker value of 10% in whole instantaneous flicker values, P ₅₀Expression is just less than the instantaneous flicker value of 50% in whole instantaneous flicker values.

In sum, the system of the measurement Short Term Flicker that the embodiment of the invention provides is by obtaining the instantaneous flicker value; Described instantaneous flicker value is carried out classification, record the number of the described instantaneous flicker value under each rank, can only store at data space the number of the described instantaneous flicker value under each rank, and need not as in the prior art, store the data that all samplings obtain, need the data volume of storing in the computation process so can reduce; And, in this programme, according to described rank, and the number of the described instantaneous flicker value under each rank, definite just less than five instantaneous flicker values of 0.1%, 1%, 3%, 10%, 50% in whole instantaneous flicker values, substituted and obtained CPF in the prior art _0.1, CPF ₁, CPF ₃, CPF ₁₀, CPF ₅₀Therefore the process (relating to the comparison and statistics of total data in this process) of corresponding S (p.u.) value has simplified computation process, can obtain in real time the Short Term Flicker value.

Fig. 7 is the structural drawing of stage unit of the system of measurement Short Term Flicker of the present invention.As shown in Figure 7, described stage unit 602 can comprise:

Round subelement 701, for described instantaneous flicker is on duty with predefined quantizing factor, the instantaneous flicker value after obtaining rounding;

Judgment sub-unit 702 is used for judging that whether instantaneous flicker value after described the rounding is greater than default value;

The first classification subelement 703, be used for when the judged result of described judgment sub-unit 702 when being, described instantaneous flicker value is included into the rank corresponding with described default value;

The second classification subelement 704 is used for when described judgment sub-unit 702 when the determination result is NO described instantaneous flicker value being included into the rank corresponding with the instantaneous flicker value after described the rounding.

Fig. 8 is the structural drawing of critical instantaneous flicker value determining unit of the system of measurement Short Term Flicker of the present invention.As shown in Figure 8, described critical instantaneous flicker value determining unit 604 can comprise:

Serial number range is determined subelement 801, is used for according to described rank, and the number of the described instantaneous flicker value under each rank, according to instantaneous flicker value order from big to small corresponding to each rank, determine serial number range corresponding to described each rank;

Numerical value is determined subelement 802, is used for total number of instantaneous flicker value be multiply by respectively 0.1%, 1%, 3%, 10%, 50%, obtains five numerical value;

Sequence number is determined subelement 803, is used for definite five sequence numbers just greater than described five numerical value;

Rank is determined subelement 804, is used for determining described five ranks that sequence number is corresponding;

Critical instantaneous flicker value is determined subelement 805, is used for the instantaneous flicker value of the rank that described five sequence numbers are corresponding, just is defined as five instantaneous flicker values less than 0.1%, 1%, 3%, 10%, 50% in whole instantaneous flicker values.

Each embodiment adopts the mode of going forward one by one to describe in this instructions, and what each embodiment stressed is and the difference of other embodiment that identical similar part is mutually referring to getting final product between each embodiment.For the disclosed system of embodiment, because it is corresponding with the disclosed method of embodiment, so description is fairly simple, relevant part partly illustrates referring to method and gets final product.

Used specific case herein principle of the present invention and embodiment are set forth, the explanation of above embodiment just is used for helping to understand method of the present invention and core concept thereof; Simultaneously, for one of ordinary skill in the art, according to thought of the present invention, all will change in specific embodiments and applications.In sum, this description should not be construed as limitation of the present invention.

Claims (6)

1. a method of measuring Short Term Flicker is characterized in that, comprising:

In Preset Time, obtain the instantaneous flicker value;

Described instantaneous flicker value is carried out classification, and each rank is corresponding to a value of instantaneous flicker value;

Record the number of the described instantaneous flicker value under each rank;

According to described rank, and the number of the described instantaneous flicker value under each rank, just determine five instantaneous flicker values less than 0.1%, 1%, 3%, 10%, 50% in whole instantaneous flicker values;

According to formula $P_{\mathrm{st}}=\sqrt{0.0314P_{0.1}+0.0525P_1+0.0657P_3+0.28P_{10}+0.08P_{50}},$ Calculate the Short Term Flicker in the described Preset Time;

Wherein, P _StRepresent the Short Term Flicker value in the described Preset Time, P _0.1Expression is just less than the instantaneous flicker value of 0.1% in whole instantaneous flicker values, P ₁Expression is just less than the instantaneous flicker value of 1% in whole instantaneous flicker values, P ₃Expression is just less than the instantaneous flicker value of 3% in whole instantaneous flicker values, P ₁₀Expression is just less than the instantaneous flicker value of 10% in whole instantaneous flicker values, P ₅₀Expression is just less than the instantaneous flicker value of 50% in whole instantaneous flicker values.

2. method according to claim 1 is characterized in that, described described instantaneous flicker value is carried out classification, comprising:

Described instantaneous flicker is on duty with predefined quantizing factor, the instantaneous flicker value after obtaining rounding;

Judge that whether instantaneous flicker value after described the rounding is greater than default value;

If so, then described instantaneous flicker value is included into the rank corresponding with described default value;

Otherwise, described instantaneous flicker value is included into the rank corresponding with the instantaneous flicker value after described the rounding.

3. method according to claim 1 is characterized in that, and is described definite just less than five instantaneous flicker values of 0.1%, 1%, 3%, 10%, 50% in whole instantaneous flicker values, comprising:

According to described rank, and the number of the described instantaneous flicker value under each rank, according to instantaneous flicker value order from big to small corresponding to each rank, determine serial number range corresponding to described each rank;

Total number of instantaneous flicker value be multiply by respectively 0.1%, 1%, 3%, 10%, 50%, obtain five numerical value;

Determine five sequence numbers just greater than described five numerical value;

Determine described five ranks that sequence number is corresponding;

Instantaneous flicker value in the rank that described five sequence numbers are corresponding just is defined as five instantaneous flicker values less than 0.1%, 1%, 3%, 10%, 50% in whole instantaneous flicker values.

4. a system of measuring Short Term Flicker is characterized in that, comprising:

Instantaneous flicker value acquiring unit is used for obtaining the instantaneous flicker value in Preset Time;

Stage unit is used for described instantaneous flicker value is carried out classification, and each rank is corresponding to a value of instantaneous flicker value;

The number record cell is for the number of the described instantaneous flicker value under each rank of record;

Critical instantaneous flicker value determining unit is used for according to described rank, and the number of the described instantaneous flicker value under each rank, just determines five instantaneous flicker values less than 0.1%, 1%, 3%, 10%, 50% in whole instantaneous flicker values;

The Short Term Flicker computing unit is used for according to formula $P_{\mathrm{st}}=\sqrt{0.0314P_{0.1}+0.0525P_1+0.0657P_3+0.28P_{10}+0.08P_{50}},$ Calculate the Short Term Flicker in the described Preset Time;

Wherein, P _StRepresent the Short Term Flicker value in the described Preset Time, P _0.1Expression is just less than the instantaneous flicker value of 0.1% in whole instantaneous flicker values, P ₁Expression is just less than the instantaneous flicker value of 1% in whole instantaneous flicker values, P ₃Expression is just less than the instantaneous flicker value of 3% in whole instantaneous flicker values, P ₁₀Expression is just less than the instantaneous flicker value of 10% in whole instantaneous flicker values, P ₅₀Expression is just less than the instantaneous flicker value of 50% in whole instantaneous flicker values.

5. system according to claim 4 is characterized in that, described stage unit comprises:

Round subelement, for described instantaneous flicker is on duty with predefined quantizing factor, the instantaneous flicker value after obtaining rounding;

Judgment sub-unit is used for judging that whether instantaneous flicker value after described the rounding is greater than default value;

The first classification subelement, be used for when the judged result of described judgment sub-unit when being, described instantaneous flicker value is included into the rank corresponding with described default value;

The second classification subelement is used for when described judgment sub-unit when the determination result is NO described instantaneous flicker value being included into the rank corresponding with the instantaneous flicker value after described the rounding.

6. system according to claim 4 is characterized in that, described critical instantaneous flicker value determining unit comprises:

Serial number range is determined subelement, is used for according to described rank, and the number of the described instantaneous flicker value under each rank, according to instantaneous flicker value order from big to small corresponding to each rank, determine serial number range corresponding to described each rank;

Numerical value is determined subelement, is used for total number of instantaneous flicker value be multiply by respectively 0.1%, 1%, 3%, 10%, 50%, obtains five numerical value;

Sequence number is determined subelement, is used for definite five sequence numbers just greater than described five numerical value;

Rank is determined subelement, is used for determining described five ranks that sequence number is corresponding;

Critical instantaneous flicker value is determined subelement, is used for the instantaneous flicker value of the rank that described five sequence numbers are corresponding, just is defined as five instantaneous flicker values less than 0.1%, 1%, 3%, 10%, 50% in whole instantaneous flicker values.

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