CN105826918A - Method and system for calculating theoretical line loss of power grid - Google Patents

Abstract

The invention relates to a method and a system for calculating theoretical line loss of a power grid. The method comprises steps: device parameters, operation parameters and topological data are acquired; a to-be-measured object is acquired, and a corresponding calculation method is determined according to the type of the to-be-measured object; and a corresponding calculation method is called, data needed by the corresponding calculation method are acquired from the device parameters, the operation parameters and the topological data, and theoretical line loss of the to-be-measured object is calculated and outputted. According to the power grid theoretical line loss calculation method of the invention, a corresponding calculation method is matched for a different to-be-measured object, data needed for calculation are automatically acquired from an existing power grid service management platform, the theoretical line loss of the power grid can be calculated in real time, and as a different to-be-measured object adopts a different calculation method, features of each to-be-measured object and features of each calculation method are fully considered, and each to-be-measured object is matched with a corresponding calculation method so as to improve the theoretical line loss calculation accuracy.

Description

The computational methods of Calculating Network Theoretical Line Loss and system

Technical field

The present invention relates to electric power network technique field, particularly relates to computational methods and the system of a kind of Calculating Network Theoretical Line Loss.

Background technology

Theory wire loss is the parameter according to power supply unit and the power network method of operation at that time and trend distribution and load condition, the Theoretical Calculation line loss drawn.Line loss theoretical calculation is wastage reducing and energy saving, strengthens important technical management means of Controlling line loss.Energy loss regularity of distribution in electrical network can be found by Theoretical Calculation, management and technical problem can be exposed by computational analysis, fall is damaged work and provides theory and technology foundation, so often to carry out line loss theoretical calculation in the construction retrofit process and normal management of electrical network.

Existing theoretical line loss caluclation often uses single computational methods to calculate the grid line loss of different types of electric pressure, owing to the electrical network of different electric pressures has difference, the theory wire loss result therefore using the single method different types of electrical network of calculating is inaccurate.

Summary of the invention

Based on this, it is necessary to provide a kind of computational methods calculating Calculating Network Theoretical Line Loss accurately and system

A kind of computational methods of Calculating Network Theoretical Line Loss, including:

Obtain device parameter, service data and topological data；

Obtain object to be measured, determine the computational methods of correspondence according to the type of object to be measured；

Calling the computational methods of correspondence, the data needed for obtaining the computational methods of correspondence from device parameter, service data and topological data calculate the theory wire loss of object to be measured and export.

Wherein in a kind of embodiment, obtain object to be measured, determine that according to the type of object to be measured the step of the computational methods of correspondence includes:

Obtain object to be measured, determine that the type of object to be measured is high-voltage fence, medium voltage network or low voltage electric network；

When object to be measured is high-voltage fence, determine that the computational methods of correspondence include calculating power system load flow and rms current method；

When object to be measured is medium voltage network, determine that the computational methods of correspondence include capacity of distribution transform substitutional resistance method and integration method；

When object to be measured is low voltage electric network, determine that the computational methods of correspondence include forward-backward sweep method and loss of voltage method.

Wherein in a kind of embodiment, call the computational methods of correspondence, data needed for obtaining the computational methods of correspondence from device parameter, service data and topological data calculate the theory wire loss of object to be measured and the step that exports includes: calling the computational methods of correspondence when being power flow algorithm, the data obtained from device parameter, service data and topological data include: the meritorious data of electromotor, idle data, the meritorious data of load, idle data, network topology structure and design impedance parameter；

Calling the computational methods of correspondence when being rms current method, the data obtained from device parameter, service data and topological data include: equipment component resistance, operation hours and the root-mean-square in the operation time；

Calling the computational methods of correspondence when being capacity of distribution transform substitutional resistance method, the data obtained from device parameter, service data and topological data include: distribution transforming number of units that the empty damage of distribution transforming, electrical network distribution transforming number, the total rms current of medium voltage distribution network head end, medium-voltage distribution network operation time, the rated capacity of distribution transforming, the nominal load loss of distribution transforming, the rated voltage of electrical network, the resistance of distribution sections, distribution sections are hung below and full electric network distribution sections number；

Calling the computational methods of correspondence when being integration method, the data obtained from device parameter, service data and topological data include: resistance when sampling number, sending end timing sampling electric current, electricity sample and sampling time interval；

Calling the computational methods of correspondence when being loss of voltage method, the data obtained from device parameter, service data and topological data include: be sampled platform district sending end voltage, terminal voltage and wire coefficient；

Calling the computational methods of correspondence when being forward-backward sweep method, the data obtained from device parameter, service data and topological data include: network topology structure, burden with power rate, load or burden without work rate and power supply point voltage.

Wherein in a kind of embodiment, calling the computational methods of correspondence, after theory wire loss that the data needed for obtaining the computational methods of correspondence calculate object to be measured the step that exports, also including from device parameter, service data and topological data:

Accept the amendment device parameter of the equipment to object to be measured；

Call the computational methods of correspondence, calculate the analog theory line loss of object to be measured according to the data needed for the computational methods of amendment device parameter and correspondence；

Obtain fall according to theory wire loss and analog theory line loss damage suggestion and export.

Wherein in a kind of embodiment, calling the computational methods of correspondence, theory wire loss that the data needed for obtaining the computational methods of correspondence from device parameter, service data and topological data calculate object to be measured the step exported include:

According to corresponding computational methods, device parameter, service data and topological data are carried out pretreatment to filter out the data needed for computational methods；

The computational methods calling correspondence calculate the theory wire loss of object to be measured and export.

A kind of calculating system of Calculating Network Theoretical Line Loss, including:

Data acquisition module, is used for obtaining device parameter, service data and topological data；

Computational methods matching module, is used for obtaining object to be measured, determines the computational methods of correspondence according to the type of object to be measured；

Line loss calculation module, for calling the computational methods of correspondence, the data needed for obtaining the computational methods of correspondence from device parameter, service data and topological data calculate the theory wire loss of object to be measured and export.

Wherein in a kind of embodiment, computational methods matching module, specifically for obtaining object to be measured, determine that the type of object to be measured is high-voltage fence, medium voltage network or low voltage electric network；

When object to be measured is high-voltage fence, determine that the computational methods of correspondence include calculating power system load flow and rms current method；

When object to be measured is medium voltage network, determine that the computational methods of correspondence include capacity of distribution transform substitutional resistance method and integration method；

When object to be measured is low voltage electric network, determine that the computational methods of correspondence include forward-backward sweep method and loss of voltage method.

Wherein in a kind of embodiment, line loss calculation module specifically for,

Calling the computational methods of correspondence when being power flow algorithm, the data obtained from device parameter, service data and topological data include: the meritorious data of electromotor, idle data, the meritorious data of load, idle data, network topology structure and design impedance parameter；

Calling the computational methods of correspondence when being rms current method, the data obtained from device parameter, service data and topological data include: equipment component resistance, operation hours and the root-mean-square in the operation time；

Calling the computational methods of correspondence when being capacity of distribution transform substitutional resistance method, the data obtained from device parameter, service data and topological data include: distribution transforming number of units that the empty damage of distribution transforming, electrical network distribution transforming number, the total rms current of medium voltage distribution network head end, medium-voltage distribution network operation time, the rated capacity of distribution transforming, the nominal load loss of distribution transforming, the rated voltage of electrical network, the resistance of distribution sections, distribution sections are hung below and full electric network distribution sections number；

Calling the computational methods of correspondence when being integration method, the data obtained from device parameter, service data and topological data include: resistance when sampling number, sending end timing sampling electric current, electricity sample and sampling time interval；

Calling the computational methods of correspondence when being loss of voltage method, the data obtained from device parameter, service data and topological data include: be sampled platform district sending end voltage, terminal voltage and wire coefficient；

Calling the computational methods of correspondence when being forward-backward sweep method, the data obtained from device parameter, service data and topological data include: network topology structure, burden with power rate, load or burden without work rate and power supply point voltage.

Wherein in a kind of embodiment, also include:

Device parameter modified module, for accepting the amendment device parameter of the equipment to object to be measured；

Line loss analog module, for calling the computational methods of correspondence, calculates the analog theory line loss of object to be measured according to the data needed for the computational methods of amendment device parameter and correspondence；

Fall is damaged and is analyzed module, damages suggestion for obtaining fall according to theory wire loss and analog theory line loss and exports.

Wherein in a kind of embodiment, line loss calculation module includes:

Screening unit, for according to corresponding computational methods, carrying out pretreatment to filter out the data needed for computational methods to device parameter, service data and topological data；

Computing unit, calculates the theory wire loss of object to be measured for calling the computational methods of correspondence and exports.

The computational methods of this Calculating Network Theoretical Line Loss, for the computational methods that different object matchings to be measured is corresponding, data needed for calculating are by automatically obtaining from the Business Management Platform of existing electrical network, the theory wire loss of electrical network can be calculated real-time online, and the computational methods that different objects to be measured is used are different, take into full account the feature of the feature every kind computational methods of each object to be measured, each object to be measured with corresponding computational methods coupling thus is improved the accuracy of theoretical line loss caluclation.

Accompanying drawing explanation

Fig. 1 is the flow chart of the computational methods of the Calculating Network Theoretical Line Loss of a kind of embodiment；

Fig. 2 is the flow chart of the computational methods of the Calculating Network Theoretical Line Loss of another embodiment；

Fig. 3 is the calculating system function module schematic diagram of the Calculating Network Theoretical Line Loss of a kind of embodiment；

Fig. 4 is the calculating system function module schematic diagram of the Calculating Network Theoretical Line Loss of another embodiment.

Detailed description of the invention

A kind of computational methods of Calculating Network Theoretical Line Loss, as it is shown in figure 1, include:

S101: obtain device parameter, service data and topological data.

Device parameter includes, the model of such as transformator, open circuit loss, rated capacity and rated voltage etc., service data includes the voltage of the equipment such as circuit, transformator, electric current, power, active energy, capacity of idle power etc..Topological data is the network structure annexation between grid equipment.

The systems such as device parameter service data and topological data can join information data center, metering automation system, dispatch automated system, EMS (EMS), SCADA (SupervisoryControlandDataAcquisition), production management system, metering automation system, load management system from the battalion of electrical network, power grid GIS obtain.

S103: obtain object to be measured, determines the computational methods of correspondence according to the type of object to be measured.

Object to be measured generally includes the element in electrical network itself and electrical network, such as, overhead transmission line, cable run, two-winding transformer etc..If object to be measured is a certain section of electrical network, then obtain the device parameter of all devices of this section of electrical network.

The computational methods that different objects to be measured is used are different, take into full account the feature of the feature every kind computational methods of each object to be measured, mated with corresponding computational methods by each object to be measured, it is possible to increase the accuracy of theoretical line loss caluclation.

S105: call the computational methods of correspondence, the data needed for obtaining the computational methods of correspondence from device parameter, service data and topological data calculate the theory wire loss of object to be measured and export.

Calculating data needed for different computational methods are different, call the computational methods of correspondence, and the data needed for obtaining the computational methods of correspondence from device parameter, service data and topological data are calculated the theory wire loss of object to be measured.

The computational methods of this Calculating Network Theoretical Line Loss, for the computational methods that different object matchings to be measured is corresponding, data needed for calculating are by automatically obtaining from the Business Management Platform of existing electrical network, the theory wire loss of electrical network can be calculated real-time online, and the computational methods that different objects to be measured is used are different, take into full account the feature of the feature every kind computational methods of each object to be measured, each object to be measured is mated with corresponding computational methods, thus improves the accuracy of theoretical line loss caluclation.

In another embodiment, step S103 includes: obtain object to be measured, determines that the type of described object to be measured is high-voltage fence, medium voltage network or low voltage electric network；

When described object to be measured is high-voltage fence, determine that the computational methods of correspondence include calculating power system load flow and rms current method；

When described object to be measured is medium voltage network, determine that the computational methods of correspondence include capacity of distribution transform substitutional resistance method and integration method；

When described object to be measured is low voltage electric network, determine that the computational methods of correspondence include forward-backward sweep method and loss of voltage method.

Wherein, high-voltage fence refers to 35KV and above electrical network thereof, and low voltage electric network refers to 0.4KV and with its following electrical network, and medium voltage network refers to the electrical network of 0.4～35KV.

Step S105 correspondence includes: calling the computational methods of described correspondence when being power flow algorithm, the data obtained from described device parameter, service data and topological data include: the meritorious data of electromotor, idle data, the meritorious data of load, idle data, network topology structure and design impedance parameter.

35kV and above power network Load flow calculation are the processes being deduced electric current, voltage by electromotor and load power, thus can get each 35kV and the active loss of above power grid elements and whole 35kV and the active loss of above power network.When setting up 35kV and above power network power flow algorithm, overhead transmission line, cable run, two-winding transformer, three-winding transformer, current-limiting reactor, shnt capacitor, shunt reactor can be counted；The power that station local coordinate frame is consumed processes as load；Phase modifier processes as electromotor.Electric energy loss in calculation interval calculates and can be attributed to day electric energy loss calculating, and the computational methods of day electric energy loss mainly have two kinds:

1. electric power law

Meritorious, meritorious, idle data, the network topology structure of idle (voltage) data, load and design impedance parameter according to electromotor hourly carry out Load flow calculation, draw each node voltage, then calculate the active loss of every branch road according to known voltage and node admittance relation.The loss of all branch roads is added, is i.e. the whole network loss of a hour.The losses of 24 hours are added, i.e. draw the line loss of a day.By the line loss of a day and then try to achieve the electric energy loss in calculation interval.

2, coulometry

Height due to the ratio of precision power meter of electric energy meter, people are often desirable to electric quantity data and participate in line loss calculation, its basic ideas are first each for power network node load of a day 24 hours to be converted to the load on the basis of the general power of corresponding 24 hours or output distribution coefficient, day electricity (active energy and capacity of idle power) will be represented again and be multiplied by corresponding load or output distribution coefficient, form active power and the reactive power of 24 hours each node loads；Similarly, generator active power and reactive power are also done similar process by its electric quantity data.Carry out Load flow calculation again.Remaining calculating is identical with electric power law, does not repeats them here.

Step S105 correspondence includes: calling the computational methods of described correspondence when being rms current method, the data obtained from described device parameter, service data and topological data include: equipment component resistance, operation hours and the root-mean-square in the operation time.

Typically 35kV and above power network are divided into four elements: overhead transmission line (includes series reactance), cable run, two-winding transformer (includes series reactance), three-winding transformer (includes series reactance), and rms current method can be used by element to calculate electric energy loss one by one.

1. the electric energy loss of overhead transmission line is:

ΔE_l=3I_jf ²RT

Wherein, R is electric network element resistance, and unit is Ω；T is that circuit runs the time, and unit is h；I_jfFor the rms current in the operation time, unit is kA.

2, two-winding transformer loss calculation

Its electric energy loss should include open circuit loss (fixed loss) and load loss (variable loss).

The basic parameter of transformator includes: rated capacity S, high-pressure side rated voltage U_n, low-pressure side rated voltage U_1n, rated no-load loss P₀, nominal load loss P_k, high-pressure side rated current I_n,

And:

$S=\sqrt{3}{U}_n{I}_n;$

$I_n=\frac{S}{\sqrt{3}{U}_n}$

Electric energy loaded loss

The substitutional resistance r of two-winding transformer_TIt is defined as: when rated current I_nWhen flowing through, produce nominal load loss p_k, i.e.So available:

$r_T=\frac{p_k}{3I_n^2}=\frac{p_k}{3{\left(\frac{S}{\sqrt{3}{U}_n}\right)}^2}=p_k{\left(\frac{U_n}{S}\right)}^2$

So transformer load electric energy loss is:

${\mathrm{\ΔE}}_T=3I_{jf}^2{r}_{T}T$

Wherein: I_jfFor high-pressure side rms current value, unit kA；r_TFor the substitutional resistance value of transformator, unit is Ω；T is transformator hours of operation, and unit is h.

3, three-winding transformer loss calculation

The basic parameter of three-winding transformer includes: high pressure, middle pressure and low pressure winding rated capacity: S₁, S₂, S₃, high pressure, middle pressure and low-pressure side rated voltage: U_n, U_1n, U_2n；Rated no-load loss P₀；Height-middle pressure, height-low pressure, medium-low pressure winding nominal load are lost: P_k12, P_k13, P_k23；High-pressure side rated current I_n。

Low-pressure side coil volume S₃Often than middle pressure winding S₂Few half, the load loss p on most of producers nameplate_k13And p_k23Refer to that low-pressure side capacity S is arrived in reduction₃On numerical value.Accordingly, it would be desirable to respective load is lost reduction to high-pressure side winding rated capacity S₁Under:

$p_{k12}^{\′}=p_{k12}{\left(\frac{S_1}{S_2}\right)}^2;$

$p_{k13}^{\′}=p_{k13}{\left(\frac{S_1}{S_3}\right)}^2;$

$p_{k23}^{\′}=p_{k23}{\left(\frac{S_1}{min(S_2,S_3)}\right)}^2$

Reduction to the height-middle pressure after high-voltage side, height-low pressure, medium-low pressure winding substitutional resistance is:

$r_{T12}=p_{k12}^{\′}{\left(\frac{U_n}{S_1}\right)}^2;$

$r_{T13}=p_{k13}^{\′}{\left(\frac{U_n}{S_1}\right)}^2;$

$r_{T23}=p_{k23}^{\′}{\left(\frac{U_n}{S_1}\right)}^2$

Owing to the substitutional resistance of each winding meets following relation:

$\left\{\begin{array}{c}{r}_{T12}=r_{T1}+r_{T2}\\ r_{T13}=r_{T1}+r_{T3}\\ r_{T23}=r_{T2}+r_{T3}\end{array}\right.$

Wherein: r_T1For high-pressure side substitutional resistance, unit is Ω；r_T2For medium voltage side substitutional resistance, unit is Ω；r_T3For low-pressure side substitutional resistance, unit is Ω.

Therefore, according to the substitutional resistance of each winding it is:

$\left\{\begin{array}{c}{r}_{T1}=\frac{r_{T12}+r_{T13}-r_{T23}}{2}\\ r_{T2}=\frac{r_{T12}+r_{T23}-r_{T13}}{2}\\ r_{T3}=\frac{r_{T13}+r_{T23}-r_{T12}}{2}\end{array}\right..$

Step S103 includes: when described object to be measured is medium voltage network, determines that the computational methods of correspondence include capacity of distribution transform substitutional resistance method and integration method.

Corresponding step S105 includes: calling the computational methods of described correspondence when being capacity of distribution transform substitutional resistance method, the data obtained from described device parameter, service data and topological data include: distribution transforming number of units that the empty damage of distribution transforming, electrical network distribution transforming number, the total rms current of medium voltage distribution network head end, medium-voltage distribution network operation time, the rated capacity of distribution transforming, the nominal load loss of distribution transforming, the rated voltage of electrical network, the resistance of distribution sections, distribution sections are hung below and full electric network distribution sections number.

The basic thought of substitutional resistance method is: total rms current of whole medium voltage distribution network flows through substitutional resistance R_dzProduced loss, whole distribution variable losses and the summation of whole distribution transforming load loss equal in medium voltage distribution network, it may be assumed that

R_dz=R_Ldz+ R_Tdz

Wherein: R_LdzFor distribution substitutional resistance, unit is Ω；R_TdzFor distribution transforming substitutional resistance, unit is Ω.

The electric energy loss of whole medium voltage distribution network is:

$\mathrm{\Δ}A=\[3I_{jf}^2(R_{Ldz}+R_{Tdz})+\underset{i=1}{\overset{m}{\Σ}}{p}_{0i}\]T$

Wherein: P_0iBeing the empty damage of i-th distribution transforming, unit is MW；M is the whole network distribution transforming number；I_jfFor the total rms current of medium voltage distribution network head end, unit is kA；T is the medium-voltage distribution network operation time, unit h.

Distribution transforming substitutional resistance R_TdzComputing formula be

$R_{Tdz}=\frac{U^2\underset{i=1}{\overset{m}{\Σ}}{p}_{ki}}{{\left(\underset{i=1}{\overset{m}{\Σ}}{S}_i\right)}^2}={\left(\frac{U}{\underset{i=1}{\overset{m}{\Σ}}{S}_i}\right)}^2\underset{i=1}{\overset{m}{\Σ}}{p}_{ki}$

Wherein: S_iIt is_iThe rated capacity of platform distribution transforming, unit is MVA；P_kiBeing the nominal load loss of i-th distribution transforming, unit is MW；U is the rated voltage of power distribution network, and unit is kV.

Distribution substitutional resistance R_LdzComputing formula be:

$R_{Ldz}=\frac{\underset{i=1}{\overset{n}{\Σ}}\[r_i{\left(\underset{j=1}{\overset{m_i}{\Σ}}{S}_j\right)}^2\]}{{\left(\underset{i=1}{\overset{m}{\Σ}}{S}_i\right)}^2}$

Wherein: r_iFor the resistance of i-th distribution sections, unit is Ω；m_iThe distribution transforming number of units hung below for i-th distribution sections；N is the whole network distribution sections number.

Corresponding step S105 includes: calling the computational methods of described correspondence when being integration method, the data obtained from described device parameter, service data and topological data include: resistance when sampling number, sending end timing sampling electric current, electricity sample and sampling time interval.

The principle of integration method is that equipment running status within a period of time is temporally divided into infinite part, obtains electric current and the resistance data in each moment, and the line loss calculating each moment carries out the cumulative loss obtaining in this period.By unrealistic for running status inifinite integral, therefore we can be carried out sampling running status by certain cycle, replace electric current and the resistance data of this existing section time with the electric current in not section time and resistance data, calculate the loss in the sampling period.

Computing formula is as follows:

$\mathrm{\Δ}E=3\underset{i=1}{\overset{n}{\Σ}}{I}_i^2{R}_i\mathrm{\Δ}t$

Wherein,_nFor sampling number, I_iIt is_iSecondary sending end timing sampling electric current, R_iIt is_iResistance during secondary sampling, Δ t is sampling time interval.

Integration method application is flexibly, it is simple to upgrading extension, but needs electric current and the resistance data of point of each sampling time.

Step S103 includes: when described object to be measured is low voltage electric network, determines that the computational methods of correspondence include forward-backward sweep method and loss of voltage method.

Corresponding, step S105 includes: calling the computational methods of described correspondence when being loss of voltage method, the data obtained from described device parameter, service data and topological data include: be sampled platform district sending end voltage, terminal voltage and wire coefficient.

0.4kV low voltage network load character is divided into city net, suburb net and rural area net, then the low voltage network of every kind of character is divided into heavy load, middle load, light load three class by load type.To each load type, extract several typical case platform districts respectively, i.e. supply load is normal, it is complete to measure, electric energy meter normal operation, several districts without stealing electricity phenomenon, its line loss in calculation interval is surveyed, thus obtains the electric energy loss value (MWh/MW) of the unit capacity of distribution transform in these districts.These values are respectively applied to other districts with same load character and same load type again, calculate its electric energy loss respectively.The finally electric energy loss to three kinds of load character low voltage networks is sued for peace, and obtains the electric energy loss of whole low voltage network.For the low voltage network of each load character, selected typical case platform district number is no less than the 5% of low voltage network sum, and minimum should be 9 Ge Tai districts (heavy load, middle load, each 3 of light load platform districts).Loss of voltage method only requires simple voltage service data, it is to avoid be difficult to the electric network composition data arranged, the most simple and easy to do but also relatively reasonable.Computing Principle is as follows:

Sampling measurement this net sending end voltage U₁With terminal voltage U₂, head end average power factorObtain sampling voltage drop:

$\mathrm{\Δ}U=\frac{U_1-U_2}{U_1}\×100\%$

Wherein: U₁For sending end voltage, i.e. low voltage network from the line voltage in the source of public distribution transformer, unit is kV；U₂For terminal voltage, i.e. with the line voltage of sending end electrical distance farthest, unit is kV.

By a wire COEFFICIENT K determined by low voltage network (mainly) wire size_pEstimate the line loss per unit of this net:

ΔP_D=K_pΔU

Wherein:

X/R is the ratio of wire reactance and resistance,For the phase angle difference between electric current and voltage, i.e. power-factor angle.Corresponding step S105 includes: calling the computational methods of described correspondence when being forward-backward sweep method, the data obtained from described device parameter, service data and topological data include: network topology structure, burden with power rate, load or burden without work rate and power supply point voltage.

Forward-backward sweep method is node voltage each to radiation network transmission line of electricity and computational calculation power, thus the method calculating theoretical line loss.Known top voltage and each node load, initialize the voltage of given each node.From the beginning of end, by load power and the initial voltage of node, calculating the electric current into electric line, thus calculate discrepancy electric line loss, derive forward the computational calculation power of previous node, derive the power of top node with this, this is backward steps；According to given top voltage and the top power tried to achieve, extrapolating the voltage drop of connection line, obtain the voltage of next node, thus derive the voltage of each node and endpoint node successively, this pushes through journey before being.Compare pushing away the voltage obtained before every time with last voltage or power, obtain voltage or the power deviation of each node, repeat back to generation and before push through (permissive condition is given) till journey, direct voltage or power deviation meet permissive condition.

Calculation procedure is as follows:

1, topology and operation of power networks data, the burden with power power P of each node are loaded_Li, load or burden without work power Q_Li；Given balance node (i.e. power supply point) voltage U₀。

2, initialize: compose Initial Voltage Value for the PQ node beyond the whole network balance nodeI.e.Typically setting amplitude as rated voltage, phase angle is 0, i.e.For rated voltage,PV node composes idle injecting power initial powerDetermine condition of convergence threshold values ε, iterations.

3, each node computational calculation power is calculated: calculate each node computing active-power P by the formula formula of step 2_iAnd reactive power Q_i。

4, forward calculation: derive the active-power P through every line by (3) (4) (5) formula_ijAnd reactive power Q_ij。

5, back substitution calculates: calculated the voltage U of each new each node by (6) (7) (8) (9) formula_jAnd phase angle theta_j。

6, checking convergence.If metTerminate, otherwise return the 3rd step and recalculate.

7, computed losses: be lost by loss calculation formula computing element and the whole network is lost.

This algorithm Computing Principle is relatively easy, and computational efficiency is high, but does not support the power network containing loop.

In another embodiment, object to be measured also includes that power equipment, the computational methods corresponding with power equipment include: capacity of distribution transform substitutional resistance method, integration method, forward-backward sweep method or loss of voltage method any one.

In another embodiment, as in figure 2 it is shown, after step S105, also include:

S107: accept the amendment device parameter of the equipment to object to be measured.

The parameter of the equipment of object to be measured can also be modified by user, with to simulating theory wire loss to be measured.

S109: call the computational methods of correspondence, calculates the analog theory line loss of object to be measured according to the data needed for the computational methods of amendment device parameter and correspondence.

According to the data needed for computational methods determined by preceding step and these computational methods and amendment parameter, call these computational methods and calculate the analog theory line loss of object to be measured.

S111: obtain fall according to theory wire loss and analog theory line loss and damage suggestion and export.

By the analog theory line loss after the comparative analysis object to be measured theory wire loss under current device parameter, and amendment device parameter, fall can be obtained and damage suggestion.Damaging suggestion according to fall, the attendant of power system can be replaced reducing the line loss of object to be measured to equipment.

In another embodiment, before step S101, also include:

S100: pre-set the corresponding relation of different types of object to be measured and computational methods.

Concrete, the computational methods of high-voltage fence are set to calculating power system load flow or rms current method；The computational methods of medium voltage network are set to that capacity of distribution transform substitutional resistance method, Allocation transformer be mensuration or integration method；The computational methods of low voltage electric network are set to forward-backward sweep method, user's coulometry or loss of voltage method.

The many algorithms such as power flow algorithm, substitutional resistance method, forward-backward sweep method are integrated in one by these Calculating Network Theoretical Line Loss computational methods, calculate according to the algorithm that object choice to be measured is corresponding, it is capable of the accurate calculating of the theory wire loss of object to be measured, such as, it is achieved before middle pressure quasi real time integration and low-voltage platform area, push back the accurate calculating in generation.

In another embodiment, step S105 includes:

S1051: according to corresponding computational methods, device parameter, service data and topological data are carried out pretreatment to filter out the data needed for computational methods.

In a particular embodiment, each computational methods corresponding, data check rule is set according to the data needed for computational methods, screens to obtain the data needed for these computational methods to the data gathered.

S1053: the computational methods calling correspondence calculate the theory wire loss of object to be measured and export.

Carry out being calculated the theory wire loss of object to be measured and exporting according to the computational methods that the data call obtained is corresponding.By the data gathered are screened, to obtain the data needed for corresponding computational methods, thus improve the precision of theoretical line loss caluclation.

The computational methods of this Calculating Network Theoretical Line Loss, the theory wire loss of electrical network can be calculated real-time online, and the computational methods that different objects to be measured is used are different, take into full account the feature of each object to be measured and every kind of computational methods, each object to be measured is mated with corresponding computational methods, thus improves the accuracy of theoretical line loss caluclation, and, theory wire loss simulation can also be carried out by the device parameter of object to be measured is modified with device under test, thus obtain fall and damage suggestion.

As it is shown on figure 3, the present invention also provides for the calculating system of a kind of Calculating Network Theoretical Line Loss, including:

Data acquisition module 101, is used for obtaining device parameter, service data and topological data.

Device parameter includes, the model of such as transformator, open circuit loss, rated capacity and rated voltage etc., service data includes the voltage of the equipment such as circuit, transformator, electric current, power, active energy, capacity of idle power etc..Topological data is the network structure annexation between grid equipment.

The systems such as device parameter service data and topological data can join information data center, metering automation system, dispatch automated system, EMS (EMS), SCADA (SupervisoryControlandDataAcquisition), production management system, metering automation system, load management system from the battalion of electrical network, power grid GIS obtain.

Computational methods matching module 103, obtains object to be measured, for determining the computational methods of correspondence according to the type of object to be measured.

Object to be measured generally includes the element in electrical network itself and electrical network, such as, overhead transmission line, cable run, two-winding transformer etc..If object to be measured is a certain section of electrical network, then obtain the device parameter of all devices of this section of electrical network.

The computational methods that different objects to be measured is used are different, take into full account the feature of the feature every kind computational methods of each object to be measured, each object to be measured is mated with corresponding computational methods, the computational methods that coupling is corresponding, it is possible to increase the accuracy of theoretical line loss caluclation.

Line loss calculation module 105, calls the computational methods of correspondence, and the data needed for obtaining the computational methods of correspondence from device parameter, service data and topological data calculate the theory wire loss of object to be measured and export.

Calculating data needed for different computational methods are different, call the computational methods of correspondence, and the data needed for obtaining the computational methods of correspondence from device parameter, service data and topological data are calculated the theory wire loss of object to be measured.

The calculating system of this Calculating Network Theoretical Line Loss, for the computational methods that different object matchings to be measured is corresponding, data needed for calculating are by automatically obtaining from the Business Management Platform of existing electrical network, the theory wire loss of electrical network can be calculated real-time online, and the computational methods that different objects to be measured is used are different, take into full account the feature of the feature every kind computational methods of each object to be measured, each object to be measured is mated with corresponding computational methods, thus improves the accuracy of theoretical line loss caluclation.

In another embodiment, computational methods matching module 103, specifically for obtaining object to be measured, determine that the type of described object to be measured is high-voltage fence, medium voltage network or low voltage electric network；

When described object to be measured is high-voltage fence, determine that the computational methods of correspondence include calculating power system load flow and rms current method；

When described object to be measured is medium voltage network, determine that the computational methods of correspondence include capacity of distribution transform substitutional resistance method and integration method；

When described object to be measured is low voltage electric network, determine that the computational methods of correspondence include forward-backward sweep method and loss of voltage method.

Wherein, high-voltage fence refers to 35KV and above electrical network thereof, and low voltage electric network refers to 0.4KV and with its following electrical network, and medium voltage network refers to the electrical network of 0.4～35KV.

Line loss calculation module concrete 105 is used for:

Calling the computational methods of described correspondence when being power flow algorithm, the data obtained from described device parameter, service data and topological data include: the meritorious data of electromotor, idle data, the meritorious data of load, idle data, network topology structure and design impedance parameter；

Calling the computational methods of described correspondence when being rms current method, the data obtained from described device parameter, service data and topological data include: equipment component resistance, operation hours and the root-mean-square in the operation time；

Calling the computational methods of described correspondence when being capacity of distribution transform substitutional resistance method, the data obtained from described device parameter, service data and topological data include: distribution transforming number of units that the empty damage of distribution transforming, electrical network distribution transforming number, the total rms current of medium voltage distribution network head end, medium-voltage distribution network operation time, the rated capacity of distribution transforming, the nominal load loss of distribution transforming, the rated voltage of electrical network, the resistance of distribution sections, distribution sections are hung below and full electric network distribution sections number；

Calling the computational methods of described correspondence when being integration method, the data obtained from described device parameter, service data and topological data include: resistance when sampling number, sending end timing sampling electric current, electricity sample and sampling time interval；

Calling the computational methods of described correspondence when being loss of voltage method, the data obtained from described device parameter, service data and topological data include: be sampled platform district sending end voltage, terminal voltage and wire coefficient；

Calling the computational methods of described correspondence when being forward-backward sweep method, the data obtained from described device parameter, service data and topological data include: network topology structure, burden with power rate, load or burden without work rate and power supply point voltage.

In another embodiment, as shown in Figure 4, also include:

Device parameter modified module 107, for accepting the amendment device parameter of the equipment to object to be measured.

Line loss analog module 109, for calling the computational methods of correspondence, calculates the analog theory line loss of object to be measured according to the data needed for the computational methods of amendment device parameter and correspondence.

According to computational methods determined by above and the data needed for these computational methods and amendment parameter, call these computational methods and calculate the analog theory line loss of object to be measured.

Fall is damaged and is analyzed module 111, damages suggestion for obtaining fall according to theory wire loss and analog theory line loss and exports.

By the analog theory line loss after the comparative analysis object to be measured theory wire loss under current device parameter, and amendment device parameter, fall can be obtained and damage suggestion.Damaging suggestion according to fall, the attendant of power system can be replaced reducing the line loss of object to be measured to equipment.

In another embodiment, also include:

Module 100 is set, for pre-setting the corresponding relation of different types of object to be measured and computational methods.

Concrete, the computational methods of high-voltage fence are set to calculating power system load flow or rms current method；The computational methods of medium voltage network are set to that capacity of distribution transform substitutional resistance method, Allocation transformer be mensuration or integration method；The computational methods of low voltage electric network are set to forward-backward sweep method, user's coulometry or loss of voltage method.

This Calculating Network Theoretical Line Loss calculates system and is integrated in one by the many algorithms such as power flow algorithm, substitutional resistance method, forward-backward sweep method, calculate according to the algorithm that object choice to be measured is corresponding, it is capable of the accurate calculating of the theory wire loss of object to be measured, such as, it is achieved before middle pressure quasi real time integration and low-voltage platform area, push back the accurate calculating in generation.

In another embodiment, line loss calculation module includes:

Screening unit, for according to corresponding computational methods, carrying out pretreatment to filter out the data needed for computational methods to device parameter, service data and topological data.

In a particular embodiment, each computational methods corresponding, data check rule is set according to the data needed for computational methods, screens to obtain the data needed for these computational methods to the data gathered.

Computing unit, calculates the theory wire loss of object to be measured for calling the computational methods of correspondence and exports.

Carry out being calculated the theory wire loss of object to be measured and exporting according to the computational methods that the data call obtained is corresponding.By the data gathered are screened, to obtain the data needed for corresponding computational methods, thus improve the precision of theoretical line loss caluclation.

The calculating system of this Calculating Network Theoretical Line Loss, the theory wire loss of electrical network can be calculated real-time online, and the computational methods that different objects to be measured is used are different, take into full account the feature of each object to be measured and every kind of computational methods, each object to be measured is mated with corresponding computational methods, thus improves the accuracy of theoretical line loss caluclation, and, theory wire loss simulation can also be carried out by the device parameter of object to be measured is modified with device under test, thus obtain fall and damage suggestion.

Each technical characteristic of above example can combine arbitrarily, for making description succinct, all possible combination of each technical characteristic in above-described embodiment is not all described, but, as long as the combination of these technical characteristics does not exist contradiction, all it is considered to be the scope that this specification is recorded.

Embodiment described above only have expressed the several embodiments of the present invention, and it describes more concrete and detailed, but can not therefore be construed as limiting the scope of the patent.It should be pointed out that, for the person of ordinary skill of the art, without departing from the inventive concept of the premise, it is also possible to make some deformation and improvement, these broadly fall into protection scope of the present invention.Therefore, the protection domain of patent of the present invention should be as the criterion with claims.

Claims (10)

1. computational methods for Calculating Network Theoretical Line Loss, including:

Obtain device parameter, service data and topological data；

Obtain object to be measured, determine the computational methods of correspondence according to the type of described object to be measured；

Calling the computational methods of described correspondence, the data needed for obtaining the computational methods of described correspondence from described device parameter, service data and topological data calculate the theory wire loss of object to be measured and export.

The computational methods of Calculating Network Theoretical Line Loss the most according to claim 1, it is characterised in that described acquisition object to be measured, determine that according to the type of described object to be measured the step of the computational methods of correspondence includes:

Obtain object to be measured, determine that the type of described object to be measured is high-voltage fence, medium voltage network or low voltage electric network；

When described object to be measured is high-voltage fence, determine that the computational methods of correspondence include calculating power system load flow and rms current method；

When described object to be measured is medium voltage network, determine that the computational methods of correspondence include capacity of distribution transform substitutional resistance method and integration method；

When described object to be measured is low voltage electric network, determine that the computational methods of correspondence include forward-backward sweep method and loss of voltage method.

The computational methods of Calculating Network Theoretical Line Loss the most according to claim 2, it is characterized in that, the described computational methods calling described correspondence, from described device parameter, theory wire loss that data needed for obtaining the computational methods of described correspondence in service data and topological data calculate object to be measured the step exported include: call the computational methods of described correspondence when being power flow algorithm, from described device parameter, the data obtained in service data and topological data include: the meritorious data of electromotor, idle data, the meritorious data of load, idle data, network topology structure and design impedance parameter；

Calling the computational methods of described correspondence when being rms current method, the data obtained from described device parameter, service data and topological data include: equipment component resistance, operation hours and the root-mean-square in the operation time；

Calling the computational methods of described correspondence when being capacity of distribution transform substitutional resistance method, the data obtained from described device parameter, service data and topological data include: distribution transforming number of units that the empty damage of distribution transforming, electrical network distribution transforming number, the total rms current of medium voltage distribution network head end, medium-voltage distribution network operation time, the rated capacity of distribution transforming, the nominal load loss of distribution transforming, the rated voltage of electrical network, the resistance of distribution sections, distribution sections are hung below and full electric network distribution sections number；

Calling the computational methods of described correspondence when being integration method, the data obtained from described device parameter, service data and topological data include: resistance when sampling number, sending end timing sampling electric current, electricity sample and sampling time interval；

Calling the computational methods of described correspondence when being loss of voltage method, the data obtained from described device parameter, service data and topological data include: be sampled platform district sending end voltage, terminal voltage and wire coefficient；

Calling the computational methods of described correspondence when being forward-backward sweep method, the data obtained from described device parameter, service data and topological data include: network topology structure, burden with power rate, load or burden without work rate and power supply point voltage.

The computational methods of Calculating Network Theoretical Line Loss the most according to claim 1, it is characterized in that, in the computational methods calling described correspondence, after theory wire loss that data needed for obtaining the computational methods of described correspondence from described device parameter, service data and topological data calculate object to be measured the step that exports, also include:

Accept the amendment device parameter of the equipment to described object to be measured；

Call the computational methods of correspondence, calculate the analog theory line loss of object to be measured according to the data needed for the computational methods of described amendment device parameter and correspondence；

Obtain fall according to described theory wire loss and analog theory line loss damage suggestion and export.

The computational methods of Calculating Network Theoretical Line Loss the most according to claim 1, it is characterized in that, calling the computational methods of described correspondence, theory wire loss that data needed for obtaining the computational methods of described correspondence from described device parameter, service data and topological data calculate object to be measured the step exported include:

According to the computational methods of described correspondence, described device parameter, service data and topological data are carried out pretreatment to filter out the data needed for described computational methods；

The computational methods calling correspondence calculate the theory wire loss of object to be measured and export.

6. a calculating system for Calculating Network Theoretical Line Loss, including:

Data acquisition module, is used for obtaining device parameter, service data and topological data；

Computational methods matching module, is used for obtaining object to be measured, determines the computational methods of correspondence according to the type of described object to be measured；

Line loss calculation module, for calling the computational methods of described correspondence, the data needed for obtaining the computational methods of described correspondence from described device parameter, service data and topological data calculate the theory wire loss of object to be measured and export.

The calculating system of Calculating Network Theoretical Line Loss the most according to claim 6, it is characterised in that described computational methods matching module, specifically for obtaining object to be measured, determines that the type of described object to be measured is high-voltage fence, medium voltage network or low voltage electric network；

When described object to be measured is high-voltage fence, determine that the computational methods of correspondence include calculating power system load flow and rms current method；

When described object to be measured is medium voltage network, determine that the computational methods of correspondence include capacity of distribution transform substitutional resistance method and integration method；

When described object to be measured is low voltage electric network, determine that the computational methods of correspondence include forward-backward sweep method and loss of voltage method.

The calculating system of Calculating Network Theoretical Line Loss the most according to claim 7, it is characterised in that described line loss calculation module specifically for,

Calling the computational methods of described correspondence when being power flow algorithm, the data obtained from described device parameter, service data and topological data include: the meritorious data of electromotor, idle data, the meritorious data of load, idle data, network topology structure and design impedance parameter；

Calling the computational methods of described correspondence when being rms current method, the data obtained from described device parameter, service data and topological data include: equipment component resistance, operation hours and the root-mean-square in the operation time；

Calling the computational methods of described correspondence when being capacity of distribution transform substitutional resistance method, the data obtained from described device parameter, service data and topological data include: distribution transforming number of units that the empty damage of distribution transforming, electrical network distribution transforming number, the total rms current of medium voltage distribution network head end, medium-voltage distribution network operation time, the rated capacity of distribution transforming, the nominal load loss of distribution transforming, the rated voltage of electrical network, the resistance of distribution sections, distribution sections are hung below and full electric network distribution sections number；

Calling the computational methods of described correspondence when being integration method, the data obtained from described device parameter, service data and topological data include: resistance when sampling number, sending end timing sampling electric current, electricity sample and sampling time interval；

Calling the computational methods of described correspondence when being loss of voltage method, the data obtained from described device parameter, service data and topological data include: be sampled platform district sending end voltage, terminal voltage and wire coefficient；

Calling the computational methods of described correspondence when being forward-backward sweep method, the data obtained from described device parameter, service data and topological data include: network topology structure, burden with power rate, load or burden without work rate and power supply point voltage.

The calculating system of Calculating Network Theoretical Line Loss the most according to claim 6, it is characterised in that also include:

Device parameter modified module, for accepting the amendment device parameter of the equipment to described object to be measured；

Line loss analog module, for calling the computational methods of correspondence, calculates the analog theory line loss of object to be measured according to the data needed for the computational methods of described amendment device parameter and correspondence；

Fall is damaged and is analyzed module, damages suggestion for obtaining fall according to described theory wire loss and analog theory line loss and exports.

The calculating system of Calculating Network Theoretical Line Loss the most according to claim 6, it is characterised in that described line loss calculation module includes:

Screening unit, for the computational methods according to described correspondence, carries out pretreatment to filter out the data needed for described computational methods to described device parameter, service data and topological data；

Computing unit, calculates the theory wire loss of object to be measured for calling the computational methods of correspondence and exports.