CN105486980B - A kind of power transmission line energy-saving safety operating system - Google Patents

A kind of power transmission line energy-saving safety operating system Download PDF

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CN105486980B
CN105486980B CN201510989181.XA CN201510989181A CN105486980B CN 105486980 B CN105486980 B CN 105486980B CN 201510989181 A CN201510989181 A CN 201510989181A CN 105486980 B CN105486980 B CN 105486980B
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transmission line
power transmission
current
information
voltage
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CN105486980A (en
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万进
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Mountain Eastern Shandong Strong Electric Cable (Group) Limited Liability Company
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MOUNTAIN EASTERN SHANDONG STRONG ELECTRIC CABLE (GROUP) LLC
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    • GPHYSICS
    • G01MEASURING; TESTING
    • G01RMEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
    • G01R31/00Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
    • G01R31/08Locating faults in cables, transmission lines, or networks
    • G01R31/081Locating faults in cables, transmission lines, or networks according to type of conductors
    • G01R31/085Locating faults in cables, transmission lines, or networks according to type of conductors in power transmission or distribution lines, e.g. overhead

Abstract

The invention discloses a kind of power transmission line energy-saving safety operating system, which includes: first voltage sampling module, for acquiring the information of voltage and location information of the multiple spot of power transmission line in real time;First current sampling module, for acquiring the information of voltage and location information of the multiple spot of power transmission line in real time;Second voltage acquisition module, for acquiring the information of voltage and location information of generating equipment in real time;Two current acquisition modules, for acquiring the current information and location information of generating equipment in real time;Generating equipment, for providing active and reactive power to power transmission line;Transformer, the voltage exported for adjusting generating equipment to power transmission line;Increment distribution module is lost, for the three-phase unbalanced circuit loss increment of power transmission line to be allocated;Fault alarm display module, for showing transmission line malfunction warning message;Transmission line losses and failure monitoring device.The system can promptly and accurately detection power transmission line line loss increment and fault condition, realize energy saving of power transmission line safe operation.

Description

A kind of power transmission line energy-saving safety operating system
Technical field
The present invention relates to a kind of power transmission line energy-saving safety operating system.
Background technique
China's current power transmission system, there is radius of electricity supplys greatly, seaonal load variation is big, route reactive loss is big, function The problems such as rate factor is low, reactive power is unable to in-situ balancing, especially because in industrial production a large amount of non-linear, impact and The presence of wavy load brings the power quality problem got worse to power grid, and the serious voltage for affecting power grid is steady It is fixed, threaten the normal operation of power transmission line and user equipment.
Three-phase imbalance also has received widespread attention as one of the Important Problems in power quality, at present for by The calculation method of transmission line losses increment caused by three-phase imbalance has more mature research, but increases about by these losses It is also more deficient to measure the research for carrying out reasonable distribution in load side, and has the following deficiencies:
The definition of traditional degree of unbalancedness only considered voltage, not account for electric current.Although electric current can pass through voltage and resistance Anti- parameter acquires, but impedance parameter may great changes have taken place under varying environment, different time, different operation conditions, so Only consider that the uneven degree of voltage completely can not kinetic current imbalance.
In addition, with the development of distributed generation technology, more and more distributed generation resource (DG) access power transmission lines or structure It is incorporated into the power networks at power transmission line is accessed after microgrid, this numbers of branches that will lead to power transmission line further increases, and network structure is more multiple It is miscellaneous, therefore will increase fault rate.The access of distributed generation resource is so that power transmission line has traditional Radial network to become more Electric power network is held, not only network structure and property are changed, and electrical quantity changes after due to the presence of DG failure being occurred Rule is more complicated, this carrys out bigger challenge to the fault detection of power transmission line and isolation strip.
Summary of the invention
To solve the above problems, the present invention provides a kind of power transmission line energy-saving safety operating system, by the system, can and When accurate detection power transmission line line loss increment and fault condition, realize energy saving of power transmission line safe operation.
To achieve the goals above, invention provides a kind of power transmission line energy-saving safety operating system, which includes:
First voltage sampling module, for acquiring the information of voltage and location information of the multiple spot of power transmission line in real time, including it is defeated The first and last end information of voltage and location information of electric wire;
First current sampling module, for acquiring the information of voltage and location information of the multiple spot of power transmission line in real time, including it is defeated The first and last end current information and location information of electric wire;
Second voltage acquisition module, for acquiring the information of voltage and location information of generating equipment in real time;
Second current acquisition module, for acquiring the current information and location information of generating equipment in real time;
Generating equipment, for providing active and reactive power to power transmission line;
Transformer, the voltage exported for adjusting generating equipment to power transmission line;
Increment distribution module is lost, for the three-phase unbalanced circuit loss increment of power transmission line to be allocated, to keep The balance movement of transmission line of electricity;
Fault alarm display module, for showing transmission line malfunction warning message;
Transmission line losses and failure monitoring device, comprising: signal acquiring unit, line loss calculation unit, fault identification unit And fault alarm unit, in which:
Signal acquiring unit respectively from first voltage sampling module, the first current sampling module, second voltage sampling module, Second current sampling module obtains associated voltage, current signal, and corresponding signal is sent to fault identification unit and line loss meter Calculate unit;
Fault identification unit is connected with fault alarm unit;
Line loss calculation unit is connected with loss incremental modular distribution module.
Preferably, the line loss calculation unit, transmission line losses increment when calculating and distributing three-phase imbalance are specific to count Calculation mode is as follows:
(1) total losses increment Delta P caused by power transmission line three characteristics of the middle term imbalance is determined;
(2) the unbalanced power degree parameter UPR of each load when power transmission line three-phase imbalance is determinedLi, the power of each load Degree of unbalancedness parameter UPRLiCalculated by following unbalanced power degree parameter UPR formula:
In formula: S+=3V+I+, wherein V+And I+The respectively positive preamble section of voltage and current of the load side of route where load Virtual value, which can be measured to obtain, and can also be calculated by existing formula, Computing Principle is the same as hereafter The forward-order current component I mentioned1;θ+For V+And I+Phase angle difference;Effective apparent energy S in the formulae =3VeIe, wherein VeThe equivalent voltage of the load side of route where load is line voltage equivalence value, IeThe route where load Load side equivalent current, be line current equivalence value;
(3) according to the unbalanced power degree parameter UPR of the total losses increment Delta P and each loadLiIt counts according to the following equation Calculate the loss increment Delta P of each loadi, formula are as follows:
N is load quantity;
(4) according to the loss increment Delta P of each loadiTransmission line losses increment when to power transmission line three-phase imbalance into Row distribution, i.e., by power transmission line three-phase imbalance when transmission line losses increment according to each load loss increment Delta PiIt is corresponding Distribute to each load.
Preferably, the fault identification unit includes:
First identification subelement, for extracting and identifying the transmission current information from signal acquiring unit;
Second identification subelement, for extracting and identifying the transmission current location information from signal acquiring unit;
Judging unit, whether the current information for judging acquired is located at except default value range, if so, institute It states signal processor and issues alarm command and the location information to the fault alarm unit, so that the fault alarm list The location information is sent to fault alarm module by member, to show that corresponding branch breaks down.
Preferably, the judgment sub-unit includes: filter, for passing through preset bandpass filter to acquired institute Current information filtering is stated, is obtained remaining between the high end cut-off frequencies and low-end cut-off frequency of the bandpass filter Current information;First calculates sub- device, for making Fourier's variation to the remaining current information, obtains described remaining The frequency response of current information;Second calculator, the mean value of the frequency response for obtaining the remaining current information;It patrols Arithmetic unit is collected, for judging whether the mean value is greater than default value.
Preferably, the signal acquiring unit by wireless network obtain through the various information of voltage, current information and Location information.
A kind of power transmission line energy-saving safety operating system provided by the invention has the advantages that (1) can be based on obtaining in real time The voltage and current information of multiple nodes of the power transmission line taken analyzes and determines the current line loss state of power transmission line and event in real time Hinder situation.(2) location of fault can be shown with Realtime Alerts, and can be under three property off-center operation states, reasonable distribution Line loss increment, so that the operation of power transmission line energy-saving safety.
Detailed description of the invention
Fig. 1 shows a kind of block diagram of power transmission line energy-saving safety operating system of the invention;
Fig. 2 shows a kind of energy-saving transmission line losses of the invention and fault detection methods.
Specific embodiment
Fig. 1 shows a kind of power transmission line energy-saving safety operating system, which includes:
First voltage sampling module 1, for acquiring the information of voltage and location information of the multiple spot of power transmission line 10 in real time, including The first and last end information of voltage and location information of power transmission line 10;
First current sampling module 2, for acquiring the information of voltage and location information of the multiple spot of power transmission line 10 in real time, including The first and last end current information and location information of power transmission line 10;
Second voltage acquisition module 6, for acquiring the information of voltage and location information of generating equipment 8 in real time;
Second current acquisition module 7, for acquiring the current information and location information of generating equipment 8 in real time;
Generating equipment 8, for providing active and reactive power to power transmission line;
Transformer 9, the voltage exported for adjusting generating equipment to power transmission line 10;
Increment distribution module 5 is lost, for the three-phase unbalanced circuit loss increment of power transmission line to be allocated, to keep The balance movement of transmission line of electricity;
Fault alarm display module 4, for showing transmission line malfunction warning message;
Transmission line losses and failure monitoring device 3, comprising: signal acquiring unit 31, line loss calculation unit 32, fault identification Unit 33 and fault alarm unit 34, in which:
Signal acquiring unit 31 is respectively from first voltage sampling module 1, the first current sampling module 2, second voltage sampling Module 6, the second current sampling module 7 obtain associated voltage, current signal, and corresponding signal are sent to fault identification unit 33 With line loss calculation unit 32;
Fault identification unit 33 is connected with fault alarm unit 34;
Line loss calculation unit 32 and loss incremental modular distribution module 4 connect.
Preferably, the line loss calculation unit, transmission line losses increment when calculating and distributing three-phase imbalance are specific to count Calculation mode is as follows:
(1) total losses increment Delta P caused by power transmission line three characteristics of the middle term imbalance is determined;
(2) the unbalanced power degree parameter UPR of each load when power transmission line three-phase imbalance is determinedLi, the power of each load Degree of unbalancedness parameter UPRLiCalculated by following unbalanced power degree parameter UPR formula:
In formula: S+=3V+I+, wherein V+And I+The respectively positive preamble section of voltage and current of the load side of route where load Virtual value, which can be measured to obtain, and can also be calculated by existing formula, Computing Principle is the same as hereafter The forward-order current component I mentioned1;θ+For V+And I+Phase angle difference;Effective apparent energy S in the formulae =3VeIe, wherein VeThe equivalent voltage of the load side of route where load is line voltage equivalence value, IeThe route where load Load side equivalent current, be line current equivalence value;
(3) according to the unbalanced power degree parameter UPR of the total losses increment Delta P and each loadLiIt counts according to the following equation Calculate the loss increment Delta P of each loadi, formula are as follows:
N is load quantity;
(4) according to the loss increment Delta P of each loadiTransmission line losses increment when to power transmission line three-phase imbalance into Row distribution, i.e., by power transmission line three-phase imbalance when transmission line losses increment according to each load loss increment Delta PiIt is corresponding Distribute to each load.
Preferably, the fault identification unit 33 includes:
First identification subelement, for extracting and identifying the transmission current information from signal acquiring unit;
Second identification subelement, for extracting and identifying the transmission current location information from signal acquiring unit;
Judging unit, whether the current information for judging acquired is located at except default value range, if so, institute It states signal processor and issues alarm command and the location information to the fault alarm unit, so that the fault alarm list The location information is sent to fault alarm module by member, to show that corresponding branch breaks down.
Preferably, the judgment sub-unit includes: filter, for passing through preset bandpass filter to acquired institute Current information filtering is stated, is obtained remaining between the high end cut-off frequencies and low-end cut-off frequency of the bandpass filter Current information;First calculates sub- device, for making Fourier's variation to the remaining current information, obtains described remaining The frequency response of current information;Second calculator, the mean value of the frequency response for obtaining the remaining current information;It patrols Arithmetic unit is collected, for judging whether the mean value is greater than default value.
Preferably, the signal acquiring unit by wireless network obtain through the various information of voltage, current information and Location information.
Attached drawing 2 shows of the invention a kind of energy-saving transmission line losses and fault detection method, this method specific steps It is as follows:
S1. the voltage, current information and location information of the monitoring point of real-time collecting power transmission line, and by collected voltage, Current information and location information are transferred to the signal acquisition unit of control module;
S2. signal acquiring unit is received, is stored and sends above- mentioned information to line loss calculation unit and fault identification unit;
S3. line loss calculation unit carries out line loss meter according to the above-mentioned electric current from signal acquiring unit and information of voltage It calculates;
S4. fault identification unit carries out fault identification according to the current information of current each monitoring point, such as finds failure, then will Failure is sent to fault alarm unit.
Preferably, line loss is calculated in the following way in step s3:
S31. total losses increment Delta P caused by power transmission line three characteristics of the middle term imbalance is determined;
S32. the unbalanced power degree parameter UPR of each load when power transmission line three-phase imbalance is determinedLi, the power of each load Degree of unbalancedness parameter UPRLiCalculated by following unbalanced power degree parameter UPR formula:
In formula: S+=3V+I+, wherein V+And I+The respectively positive preamble section of voltage and current of the load side of route where load Virtual value, which can be measured to obtain, and can also be calculated by existing formula, Computing Principle is the same as hereafter The forward-order current component I mentioned1;θ+For V+And I+Phase angle difference;Effective apparent energy S in the formulae =3VeIe, wherein VeThe equivalent voltage of the load side of route where load is line voltage equivalence value, IeThe route where load Load side equivalent current, be line current equivalence value;
S33. according to the unbalanced power degree parameter UPR of the total losses increment Delta P and each loadLiIt counts according to the following equation Calculate the loss increment Delta P of each loadi, formula are as follows:
N is load quantity;
S34. according to the loss increment Delta P of each loadiTransmission line losses increment when to power transmission line three-phase imbalance Be allocated, i.e., by power transmission line three-phase imbalance when transmission line losses increment according to each load loss increment Delta PiIt is right Each load should be distributed to.
Preferably, in the step S31, the calculation formula of total losses increment Delta P caused by the three characteristics of the middle term is uneven are as follows: Δ P=Δ PL+ΔPfj+ΔPFe, in which: Δ PLFor line loss increment caused by power transmission line three characteristics of the middle term imbalance, calculation formula Are as follows: Δ PL=PL *-PL, whereinFor the line loss generated when three-phase imbalance, PLFor the route damage generated when three-phase equilibrium Consumption;ΔPfjFor supplementary transformer copper loss caused by power transmission line three characteristics of the middle term imbalance;ΔPFeIt is caused for power transmission line three characteristics of the middle term imbalance Supplementary transformer iron loss.
Preferably, before step S3, first further obtain and calculate power transmission line fortune when power transmission line three-phase imbalance Row data, comprising:
Obtain the three-phase current I in transmission line of electricityabc=[Ia Ib Ic]TAnd transmission line of electricity begins, the three-phase voltage V of endabc =[Va0Vb0Vc0]TAnd Va'bc=[Va'Vb'Vc']T, wherein Ia,Ib,IcRespectively transmission line of electricity A, B, the current actual value of C phase (actual value refers to the value including amplitude and phase angle), Va0,Vb0,Vc0Respectively transmission line of electricity A, B, the head end voltage actual value of C phase, Va',Vb',Vc' it is respectively transmission line of electricity A, B, the terminal voltage actual value of C phase;
Pass through formula Δ Vabc=Vabc-Va'bc=ZabcIabcCalculate the series impedance matrix of route
If non-commutation route, pass through transformation matrixWherein α=cos120 ° of+i sin120°, i is imaginary unit and formulaWithI is calculated012=[I0I1I2]TWithWherein I0、I1、I2Respectively electric current IabcZero sequence, positive sequence and negative sequence component actual value;I0、 I1、I2It can also be obtained by measurement;
If complete commutation route, Z is enabledaa=Zbb=Zcc=Zs, Zab=Zbc=Zca=Zm, then zero sequence impedance component is Z00 =Zs+2Zm=Z0, positive sequence impedance component is Z11=Zs-Zm=Z1, negative sequence impedance component is Z22=Zs-Zm=Z2, Z01=Z02= Z12=Z21=0;
Three-phase current I in the transmission line of electricityabc=[Ia Ib Ic]TAnd transmission line of electricity begins, the three-phase voltage V of endabc =[Va0Vb0Vc0]TAnd Va'bc=[Va'Vb'Vc']TCan also be by each order components value of measurement electric current, voltage, then pass through corresponding It is reversed conversion obtain;
Calculate the negative-sequence current component I2Uneven complex coefficientAnd The zero-sequence current component I0Uneven complex coefficientWherein, m0、m2Respectively zero Sequence current component I0With negative-sequence current component I2Multiple unbalance factor, δ0、δ1、δ2Respectively zero sequence, positive sequence, negative-sequence current component Phase angle part, β0、β2For the phase angle part of uneven complex coefficient;
The short circuit loss parameter P of transformer is read from transformer nameplatedWith no-load loss parameter P0And transformer is primary Side rated current INWith transformer rated primary voltage UN;The current actual value of transformer primary side A, B, C phase when obtaining operation IA,IB,ICAnd it converts and obtains its virtual valueThe current actual value I' of Circuit Fault on Secondary Transformer A, B, C phaseA,I'B,I'CAnd Conversion obtains its virtual valueAnd transformer primary side set end voltage actual value UA,UB,UCAnd it converts and obtains it effectively Value
Obtain IaL、IbL、IcLAnd InL, it is respectively in the A phase, B phase, C phase and the neutral conductor of the load side of load place route Current effective value, wherein InLIt can directly measure to obtain, can also be acquired by formula known in this field;
The A phase, B phase, C phase voltage effective value V of the load side of route where obtaining loada、Vb、VcAnd its corresponding line voltage Virtual value Vab、Vbc、Vca, calculateWherein RYFor the load resistance of star-like connection, RΔFor the load electricity of triangle connection Resistance, RYAnd RΔIt is calculated according to actual load, algorithm is techniques well known.
Preferably, in step s 4, line fault is identified with the following method:
Obtain each monitoring point current information;
Obtain the location information of each monitoring point;
Judge whether the current information obtained is located at except default value range, the signal processor sets a number It is worth range, the current value within numberical range indicates that power transmission line is in normal operating conditions, when the numerical value of the current information of acquisition When except the numberical range, indicate that failure has occurred in the branch of power transmission line, it is possible to short circuit or open circuit.
For example, the numerical values recited for the current information that record acquires every time, judges whether electric current is becoming smaller or larger, and when electricity When the time that stream information persistently becomes smaller or larger is more than preset time, judge that grid branch breaks down.
For another example the numerical values recited for recording the current information acquired every time, judges whether electric current is located at default value Whether the time except range, and except range is more than preset time, if so, judge that grid branch breaks down, if It is less than preset time, then is not determined as that circuit branch breaks down, the variation of electric current in the short time is effectively avoided and causes letter The erroneous judgement of number processor is set to failure.
For another example more multiple harmonic component can be generated when short circuit ground connection occurs, for example, 5 subharmonic or 7 subharmonic, therefore, can by detection current information in whether have harmonic component come detection circuit whether short-circuit, detection mode Can use as follows: preset bandpass filter filters the acquired current information, obtains being located at the bandpass filtering Remaining current information between the high end cut-off frequencies and low-end cut-off frequency of device.
When there are multiple harmonic, harmonic wave is normally between the frequency of 450Hz to 1400Hz, without harmonic wave When, power frequency is generally power frequency, i.e. 50Hz, therefore is arrived the 450Hz in current signal by a bandpass filter Signal extraction between 1400Hz comes out.And the bandpass filter can be a digital band-pass filter, such as passband side Edge frequency is the butterworth filter of 450Hz and 1400Hz, naturally it is also possible to be an analog bandpass filter.
The above content is a further detailed description of the present invention in conjunction with specific preferred embodiments, and it cannot be said that Specific implementation of the invention is only limited to these instructions.For those of ordinary skill in the art to which the present invention belongs, exist Under the premise of not departing from present inventive concept, several equivalent substitute or obvious modifications is made, and performance or use is identical, all should It is considered as belonging to protection scope of the present invention.

Claims (5)

1. a kind of power transmission line energy-saving safety operating system, the system include:
First voltage sampling module, for acquiring the information of voltage and location information of the multiple spot of power transmission line, including power transmission line in real time First and last end information of voltage and location information;
First current sampling module, for acquiring the current information and location information of the multiple spot of power transmission line, including power transmission line in real time First and last end current information and location information;
Second voltage acquisition module, for acquiring the information of voltage and location information of generating equipment in real time;
Second current acquisition module, for acquiring the current information and location information of generating equipment in real time;
Generating equipment, for providing active and reactive power to power transmission line;
Transformer, the voltage exported for adjusting generating equipment to power transmission line;
Increment distribution module is lost, for the three-phase unbalanced circuit loss increment of power transmission line to be allocated, to keep transmitting electricity The balance movement of route;
Fault alarm display module, for showing transmission line malfunction warning message;
Transmission line losses and failure monitoring device, comprising: signal acquiring unit, line loss calculation unit, fault identification unit and event Hinder alarm unit, in which:
Signal acquiring unit is respectively from first voltage sampling module, the first current sampling module, second voltage acquisition module, second Current acquisition module obtains associated voltage, current signal and position signal, and corresponding signal be sent to fault identification unit and Line loss calculation unit;
Fault identification unit is connected with fault alarm unit;
Line loss calculation unit is connected with loss increment distribution module.
2. the system as claimed in claim 1, which is characterized in that the line loss calculation unit calculates and distributes three-phase imbalance When transmission line losses increment, specific calculation is as follows:
(1) total losses increment Delta P caused by power transmission line three characteristics of the middle term imbalance is determined;
(2) determine that the unbalanced power degree parameter UPRLi of each load when power transmission line three-phase imbalance, the power of each load are uneven Weighing apparatus degree parameter UPRLi presses following unbalanced power degree parameter UPR formula and calculates:
In formula: S+=3V+I+, wherein V+And I+Respectively the positive preamble section of voltage and current of the load side of route where load has Valid value;Effective apparent energy S in the formulae=3VeIe, wherein VeRoute is negative where load The equivalent voltage of lotus side, IeThe equivalent current of the load side of route where load;
(3) according to the unbalanced power degree parameter UPR of the total losses increment Delta P and each loadLiIt calculates according to the following equation each The loss increment Delta P of loadi, formula are as follows:
N is load quantity;
(4) according to the loss increment Delta P of each loadiTransmission line losses increment when to power transmission line three-phase imbalance divides Match, i.e., by power transmission line three-phase imbalance when transmission line losses increment according to each load loss increment Delta PiCorresponding distribution To each load.
3. the system as claimed in claim 1, which is characterized in that the fault identification unit includes:
First identification subelement, for extracting and identifying the transmission current information from signal acquiring unit;
Second identification subelement, for extracting and identifying the transmission current location information from signal acquiring unit;
Whether judging unit, the current information for judging acquired are located at except default value range;And
Signal processor is configured to except the current information is located at the default value range, issues alarm Instruction and the location information are to the fault alarm unit, so that the fault alarm unit, the location information is sent Fault alarm display module is given, to show that corresponding branch breaks down.
4. system as claimed in claim 3, which is characterized in that the judging unit includes: filter, for by preset Bandpass filter filters the acquired current information, obtains positioned at the high end cut-off frequencies of the bandpass filter and low Hold the remaining current information between cutoff frequency;First calculates sub- device, for making in Fu to the remaining current information Leaf variation, obtains the frequency response of the remaining current information;Second calculator, for obtaining the remaining electric current The mean value of the frequency response of information;Logical-arithmetic unit, for judging whether the mean value is greater than default value.
5. the system as claimed in claim 1, which is characterized in that the signal acquiring unit is obtained described each by wireless network Kind information of voltage, current information and location information.
CN201510989181.XA 2015-12-24 2015-12-24 A kind of power transmission line energy-saving safety operating system Active CN105486980B (en)

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CN104376207A (en) * 2014-11-11 2015-02-25 国家电网公司 Power distribution network alternating current transmission loss computing and parameter estimation method
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CN105117986A (en) * 2015-09-25 2015-12-02 国网湖北节能服务有限公司 Low voltage network line loss calculating method considering the imbalance degree

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Publication number Priority date Publication date Assignee Title
CN102394501A (en) * 2011-03-18 2012-03-28 北京潞能麒麟电力设备有限公司 Energy-saving method and device based on power grid load dynamic balance
CN102509159A (en) * 2011-11-09 2012-06-20 中国电力科学研究院 Electrical-information-acquisition-system-based theoretical line loss estimation method for distribution network
CN103390253A (en) * 2013-08-01 2013-11-13 国家电网公司 Evaluation method for increment energy efficiency of power grid energy conservation and loss reduction
CN104376207A (en) * 2014-11-11 2015-02-25 国家电网公司 Power distribution network alternating current transmission loss computing and parameter estimation method
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