CN103472298B - A kind of analytical approach of electromechanical equipment harmonic energy - Google Patents

A kind of analytical approach of electromechanical equipment harmonic energy Download PDF

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CN103472298B
CN103472298B CN201310418633.XA CN201310418633A CN103472298B CN 103472298 B CN103472298 B CN 103472298B CN 201310418633 A CN201310418633 A CN 201310418633A CN 103472298 B CN103472298 B CN 103472298B
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江海
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ZHUHAI PILOT TECHNOLOGY Co Ltd
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ZHUHAI PILOT TECHNOLOGY Co Ltd
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Abstract

The present invention proposes a kind of analytical approach of electromechanical equipment harmonic energy, mainly comprises the following steps: the harmonic wave total losses E of setting electromechanical equipment tHDby quiescent harmonic loss E baseform with dynamic harmonic loss E ' two parts; Obtain the harmonic wave total losses E of N number of sampling time section in the work period tHDwith quiescent harmonic loss E base, calculate dynamic harmonic loss factor k ˊ; Dynamic harmonic Dissipation change speed L is calculated by dynamic harmonic loss factor; By judging the value of k ˊ and L in the described work period, analyzing electromechanical equipment harmonic loss situation, and carrying out respective handling.The present invention just can find the newly-increased loss caused such as aging due to equipment in a work period, carry out special Improving Measurements, and assessment improves effect, thus makes user reduce energy dissipation, promote delivery of electrical energy quality, improve power consumption efficiency.

Description

A kind of analytical approach of electromechanical equipment harmonic energy
Technical field
The present invention relates to the management of a kind of harmonic energy, particularly relate to a kind of harmonic energy management of electromechanical equipment.
Background technology
In recent years, along with the development of Power Electronic Technique, nonlinear load is widely applied, and frequency converter, electricity-saving lamp as being applied to energy-saving field are very universal.The harmonic problem that nonlinear load brings also progressively obtains the attention of people, and various harmonic wave control technology emerges in an endless stream, and reaches its maturity.But people are to the research of harmonic wave, often lay particular emphasis on it in the harm of electric power system reliability, it is few that the added losses that harmonic wave causes in various kinds of equipment are studied, and Austrian scholar GeorgeJ.Wakileh gives the computing method of harmonic wave added losses, larger on the impact of harmonic loss; But at present in electric system, people often pay close attention to the device damage that harmonic pollution brings, and are concerned about less to the relation of harmonic loss and saving energy and decreasing loss.
In actual applications, harmonic wave is also a very important capability of energy dissipation, can produce added losses, increase the network loss of electric power transfer at circuit.According in the data that Central Japan Utilities Electric Co. provides, even think when 5 subharmonic content I5/I1 are 10%, when will make there is not harmonic wave, its loss increases 10%.
Again such as, certain 100,000 square meter complex business buildings, the annual electricity consumption of central air conditioner is between 2000-3000 ten thousand kilowatt hour, and normal harmonic loss is 1.5%, then energy source loss is annual 300000-45 ten thousand kilowatt hours.In the process that this building comes into operation, aging due to equipment, the unreasonable use of frequency converter, the variable effect of environmental parameter, makes harmonic loss increase.Working time, after 1 year, makes its harmonic loss reach 3% for above-mentioned reasons, and the every annual meeting of so now brought loss increases by 300,000-45 ten thousand kilowatt hours.Detection method traditionally, whether supvr cannot discover this increase waste, even if rely on regular visit mechanism to be also just can carry out after will waiting for the several years, also cannot pass judgment on newly-increased loss controlled even if implement to patrol and examine.
Summary of the invention
The present invention is by analyzing the service data of the major harmonic source giant mechanical and electrical equipment in electric system, based on the collection environment configurations of rational electromechanical equipment, numerical value is measured in the electric energy loss that can obtain complete detailed each harmonic, thus analyze the distribution and absorption improvement situation that obtain the electric energy loss that this electromechanical equipment causes due to harmonic wave, prediction improves effect.
By this analytical model, the newly-increased loss because aging, the unreasonable use that comprises frequency converter of equipment, the change of environmental parameter cause just can be found in a work period, carry out special Improving Measurements, and assessment improves effect, thus make user reduce energy dissipation.This helps us to detect in advance and finds the generation position of harmonic wave control and optimized resolution, impels user to improve and safeguards, promotes delivery of electrical energy quality, improves power consumption efficiency.
The present invention proposes a kind of analytical approach of electromechanical equipment harmonic energy, mainly comprises the following steps:
The first step, the harmonic wave total losses E of setting electromechanical equipment tHDby quiescent harmonic loss E baseform with dynamic harmonic loss E ' two parts, wherein set quiescent harmonic loss E base=k base* E tHD, dynamic harmonic loss E '=E tHD-E base=k'*E tHD, k basequiescent harmonic loss factor and dynamic harmonic loss factor is represented respectively with k'; And set k'=f (t)=a 0+ a 1t+a 2t 2, wherein a 0, a 1, a 2for constant term coefficient, t is time variable, can be derived by above-mentioned:
k ′ = ( 1 - k base ) = 1 - E base E THD Formula (1)
Second step, obtains the harmonic wave total losses E of N number of sampling time section in the work period of electromechanical equipment tHDwith quiescent harmonic loss E base, calculated the k' value of N number of sampling time section by formula (1), and form ordered series of numbers set { (1, k 1), (2, k 2), (3, k 3) ... (n, k n), wherein 1,2 ..., n represents each sampling time section, k 1, k 2... k nrepresent the k' value of corresponding sampling time section;
3rd step, is carried out the binomial fitting of least square method, determines a by the k' value of the N number of sampling time section obtained by second step 0, a 1, a 2numerical value;
4th step, to binomial k'=f (t)=a 0+ a 1t+a 2t 2differential obtains: it represents the rate of change of dynamic harmonic loss, and to set M be sampling time section maximum in the described work period, calculates L=a 1+ 2a 2the value of M;
5th step, by judging the value of k' and L in the described work period, analyzing electromechanical equipment harmonic loss situation, and carrying out respective handling.
Accompanying drawing explanation
Fig. 1 is the process flow diagram of the analytical approach according to a kind of electromechanical equipment harmonic energy of the present invention;
Fig. 2 is dynamic harmonic loss figure according to an embodiment of the invention;
Fig. 3 is dynamic harmonic loss figure according to still another embodiment of the invention;
Fig. 4 is the dynamic harmonic loss figure according to one more embodiment of the present invention.
Embodiment
In the present invention, we define harmonic wave total losses E tHDby quiescent harmonic loss E baseform with dynamic harmonic loss E' two parts.Wherein quiescent harmonic loss, is also called the basic loss of harmonic wave, refers to for electromechanical equipment, the waste of basic loss harmonic wave, and this is the minimum harmonic requirements such as the motor action driving being limited by electromechanical equipment.And dynamic harmonic loss does not belong to basic loss harmonic wave, refer to the waste of other harmonics frequency components.Dynamic harmonic loss E' is expressed as motor and runs and the energy consumption in adjustment process, has undulatory property in time.
In harmonic loss model analysis, E tHDas a stochastic distribution of harmonic energy loss, be one with the function of time correlation, have the once item loss (t is time variable) of time correlation, it comprises quiescent harmonic loss f static(t) and dynamic harmonic loss f adjustment(t, E tHD) two classes.
Setting f static(t)=E base=k base* E tHD(1), wherein k baserepresent quiescent harmonic loss factor;
From above formula: k base = E base E THD - - - ( 2 )
Setting f adjustment(t, E tHD) component represent due to human factor or to environment, harmonic energy loss that equipment operational factor is relevant.This component mainly produces by equipment loss in operational process.F adjustment(t, E tHD) as the real-time adjustment of the operational version decision-making of equipment, data analysis can be carried out in real time, be denoted as dynamic harmonic loss.
Computing formula for this component has:
F adjustment(t, E tHD)=E '=E tHD-E base=(1-k base) * E tHD(3)
k ′ = ( 1 - k base ) = 1 - E base E THD - - - ( 4 ) ,
And set k'=f (t)=a 0+ a 1t+a 2t 2(5)
For k' value, in regular hour interval, the lifting of k' value is the performance that dynamic harmonic energy consumption increases.Now namely describe electricity consumption loop and there is a large amount of unconventional harmonic components.May aging due to equipment, the situations such as the unreasonable allocation of power load equipment, make the quality of power supply and power consumption efficiency sharply decline.
Therefore, we obtain E in N tHDand E basevalue, calculated the development trend of k' value by formula (4), i.e. a series of set { (1, k 1), (2, k 2), (3, k 3) ... (n, k n), wherein 1,2 ..., n represents year number, k 1, k 2... k nrepresent the k' value in corresponding time.
Utilize above-mentioned historical data, by the binomial fitting of least square method, above-mentioned a can be determined 0, a 1, a 2value.Further, binomial (5) differential is obtained:
df ( t ) dt = a 1 + 2 a 2 t
Get the maximal value that M is sampling instant, then can obtain the maximum pace of change of M moment dynamic loss rate
L=a 1+2a 2M
Utilize the span of above-mentioned L and k', determining apparatus harmonic loss situation.Wherein, as shown in the table:
Sequence number Formula Explanation
1 L<0.01 The dynamic harmonic proportion of goods damageds are steady, and fluctuation within a narrow range, does not point out
2 0.01<L<0.1 The change of the dynamic harmonic proportion of goods damageds is obvious, alerting
3 L>0.1 The dynamic harmonic proportion of goods damageds sharply change, prompt alarm
Check processing is carried out for change unconspicuous needs.
Should rectify and improve in time after a management cycle completes for significant change, contains that it increases.
Should rectify and improve for jumpy immediately, to avoid the further deterioration of equipment or management, cause serious consequence.
And for the instantaneous value of each moment k', then should follow following principle:
Sequence number Formula Explanation
1 k'<0.2 Dynamic harmonic proportion of goods damageds rate is in zone of reasonableness, does not point out
2 0.2<k'<0.5 Dynamic harmonic proportion of goods damageds rate is within the scope of abnormal reason, alerting
3 k'>0.5 The dynamic harmonic proportion of goods damageds are excessive, prompt alarm, emergency treatment
Below provide concrete case analysis:
1, data sampling citing in July (data are normal):
We are in actual items, from 1 day July in 2009, the baggage elevator of the 50kw in Shanghai megastore have been carried out to the collecting work of the energy consumption data of 1 month by a definite date.Be below the typical data in July:
Binomial fitting is carried out for these group data can obtain:
k'=0.0242-0.00009772t+0.0000067t 2
Matching binomial curve, as shown in Figure 2.
Its L value end is
L=0.0000134t-0.00009772=0.00031768<0.01
Analyze L known, the pace of change of the dynamic harmonic proportion of goods damageds is normal, and makes a general survey of in the whole sampling period, and do not occur the k' component being greater than 0.2, therefore we can think, within this sampling period, the harmonic wave of this equipment is in a normal scope.Do not need to carry out any prompting.
2, data sampling citing in August (data slowly increase):
Data acquisition following (only providing k') to August:
So, the quafric curve that institute's matching obtains is:
k'=0.0123-0.00117t+0.00015t 2
Functional image as shown in Figure 3.
Its time diffusion is:
L=0.0003t+0.00117
For the data slope L in August, its value is
L=0.01047>0.01
Because gained L value is greater than 0.01, represent that the pace of change of the dynamic harmonic proportion of goods damageds presents rising tendency, need alarm notification
Observe its tendency data and curve, also can find, in August, k' value increases gently.Can think that native system is in the state of inferior health operation at present, need periodically adjustment
Within the whole service cycle, k' value, not more than 0.2, can think that k' value does not present paroxysmal abnormality.
3, data sampling citing in October (data abrupt change):
So, secondary is carried out to it and obtains function to matching:
k'=-0.0445+0.019t-0.000313t 2
Functional image as shown in Figure 4.
Its time diffusion is:
L=-0.000626t+0.019
For the data slope L in October, can obtain its value is
L=0.00022<0.01
Gained L value is less than 0.01, and the pace of change of the dynamic harmonic proportion of goods damageds is not obvious, does not need alarm notification.
But within the whole service cycle, k' value presents paroxysmal abnormality more than 0.2, k' value in a large number and increases.Need to adjust equipment at once to run.
The invention reside in and utilize harmonic energy measuring equipment, gather the harmonic energy of electromechanical equipment, distribution situation in each frequency range of difference, with the relations of distribution between principal component and other each component of degree n ns, the judgement of variation tendency over a period, analyze that to judge whether to exist the loss that equipment harmonic loss brings abnormal, carry out rectify and improve to equipment to point out user and adjust, thus reaching energy-conservation object.More can make response quickly, even if reminding user rectification.
According to the present invention the efficiency system management software designed and developed can for this commercial building save in whole life cycle at least millions of more than electricity cost.

Claims (2)

1. an analytical approach for electromechanical equipment harmonic energy, mainly comprises the following steps:
The first step, the harmonic wave total losses E of setting electromechanical equipment tHDby quiescent harmonic loss E baseform with dynamic harmonic loss E ' two parts, wherein set quiescent harmonic loss E base=k base* E tHD, dynamic harmonic loss E '=E tHD-E base=k'*E tHD, k basequiescent harmonic loss factor and dynamic harmonic loss factor is represented respectively with k'; And set k'=f (t)=a 0+ a 1t+a 2t 2, wherein a 0, a 1, a 2for constant term coefficient, t is time variable, can be derived by above-mentioned:
formula (1)
Second step, obtains the harmonic wave total losses E of N number of sampling time section in the work period of electromechanical equipment tHDwith quiescent harmonic loss E base, calculated the k' value of N number of sampling time section by formula (1), and form ordered series of numbers set { (1, k 1), (2, k 2), (3, k 3) ... (n, k n), wherein 1,2 ..., n represents each sampling time section, k 1, k 2... k nrepresent the k' value of corresponding sampling time section;
3rd step, is carried out the binomial fitting of least square method, determines a by the k' value of the N number of sampling time section obtained by second step 0, a 1, a 2numerical value;
4th step, to binomial k'=f (t)=a 0+ a 1t+a 2t 2differential obtains: it represents the rate of change of dynamic harmonic loss, and to set M be sampling time section maximum in the described work period, calculates L=a 1+ 2a 2the value of M;
5th step, by judging the value of k' and L in the described work period, analyzing electromechanical equipment harmonic loss situation, and carrying out respective handling.
2. the analytical approach of electromechanical equipment harmonic energy as claimed in claim 1, wherein in the 5th step, for a described work period, as L<0.01, represent that the dynamic harmonic proportion of goods damageds are steady, fluctuation within a narrow range, does not need to point out; As 0.01<L<0.1, represent the change of the dynamic harmonic proportion of goods damageds obviously, alerting, should rectify and improve in time after the described work period completes, and containment L increases; As L>0.1, the dynamic harmonic proportion of goods damageds sharply change, prompt alarm, should rectify and improve immediately; And, for each sampling instant of a described work period, as k'<0.2, represent that the dynamic harmonic proportion of goods damageds are in zone of reasonableness, do not need to point out, work as 0.2<k'<0.5, represent that the dynamic harmonic proportion of goods damageds are in abnormal ranges, alerting; As k'>0.5, represent that the dynamic harmonic proportion of goods damageds are excessive, prompt alarm, needs emergency treatment.
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