CN105486946A - 10kV line energy-saving evaluation method - Google Patents

Abstract

The invention relates to a 10kV line energy-saving evaluation method. The method comprises the following steps that 1) the head-end current, the total active power and the total reactive power of a 10kV line are obtained; 2) a node resistance matrix of the 10kV line is calculated; 3) the maximum and minimum of loss power of the 10kV line are calculated; 4) the maximal line loss rate and the minimal line loss rate of the 10kV line within the measurement time are calculated; 5) the guide-rule line loss rate and the zero reactive power line loss rate of the 10kV line within the measurement time are calculated; 6) a line loss interval is divided into a high loss zone, a reactive management zone and a low loss zone; and 7) the step 5) is compared with the step 6) to obtain an evaluation result. According to the invention, the maximal line loss rate, the guide-rule line loss rate, the zero reactive line loss rate and the minimal line loss rate of the 10kV line can be calculated only by obtaining the head-end current, the total active power and the total reactive power of the 10kV line, and the problem that the theoretical line loss calculated value and the statistical line loss value are uncertain traditionally is solved.

Description

A kind of 10kV circuit Energy efficiency evaluation method

Technical field

The invention belongs to power distribution network delivery circuit energy efficiency evaluating method field, be specifically related to a kind of 10kV circuit Energy efficiency evaluation method.

Background technology

In recent years, China is every year because the electricity of the many losses of line loss problem reaches tens billion of kilowatt hour.Relative to 35kV and above network system, 10kV distribution network systems line loss per unit is higher.Current power department all formulates year, season, monthly line loss plan target for taking reducing loss measure to provide foundation further by theoretical line loss caluclation and long-time statistical data.For 10kV circuit, due to its complex structure, relevant data collects difficulty, and the particularly imperfection of computing method, makes 10kV line theory line loss calculation result differ larger with actual value.And statistical method of checking meter not only is invested large but also can be counted multiplying power mistake, load transfer plan, communication failure, " high for low meter " special change because of table, leak quantity calculation or power stealing etc. owing to there is these objective influence factors, the on-line monitoring of current 10kV line loss electricity and the calculated results, randomness is large, uncertain strong, being difficult to learn that falling of 10kV circuit damages space, scientific basis can not being provided for falling damage work.

Summary of the invention

The present invention is directed to the deficiencies in the prior art, propose a kind of 10kV circuit Energy efficiency evaluation method, concrete technical scheme is as follows:

A kind of 10kV circuit Energy efficiency evaluation method, is characterized in that: adopt following steps;

Step one: obtain 10kV circuit head end electric current, total active power, total reactive power data;

Step 2: the node-resistance matrix calculating 10kV circuit;

Step 3: utilize the method based on the support vector regression of particle swarm optimization algorithm to calculate described 10kV

The maxima and minima of line loss power;

Step 4: calculate the max line loss rate of described 10kV circuit in institute's minute, minimum line loss rate;

Step 5: calculate the directive/guide line loss per unit of described 10kV circuit in institute's minute and zero inactivity line

Loss rate.

Step 6: be high loss zone, reactive management district and low-loss district by line loss interval division;

Step 7: the directive/guide line loss per unit calculated in step 5 and zero inactivity line loss per unit and step 6 are compared, draws evaluation conclusion.

To better implement the present invention, may further be:

The resistance of 2.1 calculating 10kV circuits and transformer;

2.2 form 10kV line node conductance matrix G, ask that G's is inverse, and obtaining 10kV node-resistance matrix R is:

$R=\left[\begin{array}{cc}{R}_n& R_{nm}\\ R_{mn}& R_m\end{array}\right]$

Wherein, n is the load bus number in power distribution network, and m is contact nodes, and in power distribution network the numbering of load bus prior to getting in touch with the numbering of node, R _nfor n is capable, the block matrice of square of n row, its diagonal element is the self-resistance of load bus, and off-diagonal element is the mutual resistance between load bus.

Beneficial effect of the present invention is: only obtain 10kV circuit head end electric current, total active power, total reactive power data, the max line loss rate of 10kV circuit, directive/guide line loss per unit, zero idle line loss per unit and minimum line loss rate can be calculated, change the uncertain problem of traditional theoretical line loss caluclation value and statistical line losses value into determinacy.Be high loss zone, reactive management district, low-loss district by line loss interval subdivision.To not in three intervals and corresponding three interval statistics line rates carefully comment, navigate for taking reducing loss measure targetedly further, point out irrational reason (problems such as multiplying power mistake, load transfer plan, leakage quantity calculation or power stealing counted by table) that may exist, each reason is screened, reduce investigation scope, damage and Reducing Loss by Technology Means fall in guidance management, to adopt rational reducing loss measure to realize the energy-saving and cost-reducing of power distribution network.

Accompanying drawing explanation

Fig. 1 is process flow diagram of the present invention;

Fig. 2 is the process flow diagram of SVR-PSO workflow in 10kV circuit Energy efficiency evaluation method of the present invention;

Fig. 3 calculates the maximal value of 10kV line loss power and the process flow diagram of minimum value based on SVR-PSO in 10kV circuit Energy efficiency evaluation method of the present invention.

Embodiment

Below in conjunction with accompanying drawing, preferred embodiment of the present invention is described in detail, can be easier to make advantages and features of the invention be readily appreciated by one skilled in the art, thus more explicit defining is made to protection scope of the present invention.A kind of 10kV circuit Energy efficiency evaluation method comprises the following steps:

(1) from power scheduling/power distribution automation main station system, 0kV circuit head end electric current, total active power is obtained, total reactive power data.

(2) according to network topology structure and the losser parameter of 10kV circuit, calculate the node-resistance matrix of 10kV circuit, concrete steps are: (1) calculates the resistance of 10kV circuit and transformer, according to resistance and the 10kV circuit network topological structure of above-mentioned circuit and transformer, form 10kV line node conductance matrix G, ask that G's is inverse, obtaining 10kV node-resistance matrix R is:

$R=\left[\begin{array}{cc}{R}_n& R_{nm}\\ R_{mn}& R_m\end{array}\right]$

Wherein, n is the load bus number in power distribution network, and m is contact nodes, and in power distribution network the numbering of load bus prior to getting in touch with the numbering of node, R _nfor n is capable, the block matrice of square of n row, its diagonal element is the self-resistance of load bus, and off-diagonal element is the mutual resistance between load bus;

(3) to 10kV circuit head end electric current, total active power, total reactive power data and node-resistance matrix, utilize the method based on the support vector regression of particle swarm optimization algorithm to calculate the maxima and minima of described 10kV line loss power.In the timing of 10kV circuit head end electric current one, power load distributing is different, obtains different line losses, calculates max line loss rate, directive/guide line loss per unit, zero idle line loss per unit and minimum line loss rate.

$P={\left[\begin{array}{c}{I}_1\\ .\\ .\\ .\\ I_n\\ 0\\ .\\ .\\ .\\ 0\end{array}\right]}^T\·\left[\begin{array}{cc}{R}_n& R_{nm}\\ R_{mn}& R_m\end{array}\right]\·\left[\begin{array}{c}{I}_1\\ .\\ .\\ .\\ I_n\\ 0\\ .\\ .\\ .\\ 0\end{array}\right]={\left[\begin{array}{c}{I}_1\\ .\\ .\\ .\\ I_n\end{array}\right]}^T\·R_n\·\left[\begin{array}{c}{I}_1\\ .\\ .\\ .\\ I_n\end{array}\right]\·$

Apply the maximal value Pmax and the minimum value Pmin that solve 10kV circuit line loss based on the method for the support vector regression of particle swarm optimization algorithm, concrete steps are:

As illustrated in fig. 1 and 2, the method for the present embodiment support vector regression based on particle swarm optimization algorithm used: first, determines that electric current, total active power, reactive power, transformer capacity four affect the independent variable of factor as MRA of line loss; Secondly, structure sample set (training sample set, test sample book collection, sample to be tested collection) is built; Finally, adopt PSO dynamically for SVR searches for optimum training parameter, obtain maximal value and the minimum value of 10kV line loss power.

(4) the max line loss rate of described 10kV circuit in institute's minute, minimum line loss rate is calculated, be specially: needed for calculating according to the method for the described support vector regression based on particle swarm optimization algorithm, judge the electric energy loss maxima and minima in the time period, described electric energy loss maxima and minima obtained max line loss rate and the minimum line loss rate of 10kV circuit divided by the total delivery of power distribution network of this time period.The present embodiment with represent day 0 time 0 point 0 second for starting point, calculate peak power Pmax, the minimum power Pmin (unit for kilowatt) of each sampling interval according to step (3).Wherein, the same day, sampled point was N number of point sometime, and this period electric energy loss maximal value and minimum value are

Described electric energy loss maximal value Δ A _maxcalculated by following formula:

${\mathrm{\ΔA}}_{\max k}=\underset{t=1}{\overset{N}{\Σ}}\frac{\mathrm{\Δ}T}{3600}\×P_{max}+\frac{\mathrm{\Δ}T}{3600}\×P_{\mathrm{\Σ}o}\×\underset{t=1}{\overset{N}{\Σ}}{s}_t$

Electric energy loss minimum value Δ A _mincalculated by following formula:

${\mathrm{\ΔA}}_{\min }=\underset{t=1}{\overset{N}{\Σ}}\frac{\mathrm{\Δ}T}{3600}\×P_{min}+\frac{\mathrm{\Δ}T}{3600}\×P_{\mathrm{\Σ}o}\×\underset{t=1}{\overset{N}{\Σ}}{s}_t$

Wherein, in formula, N is the required sampled point judged in the time period, and △ T is sampling interval, s _tfor representing the numerical value (when circuit runs, its value is 1, and when circuit stops row, its value is 0) of circuit kth hour t period running status

(5) adopt the method equal by each substation transformer load factor provided in " power network line losses calculating directive/guide " to determine power load distributing and 10kV circuit head end electric current, survey calculation line loss electricity is out divided by the total delivery of the head end recorded in response time section thus, obtains directive/guide line loss per unit (Δ A _eq).

${\mathrm{\ΔA}}_{eq}=\underset{t=1}{\overset{N}{\Σ}}\frac{\mathrm{\Δ}T}{3600}\×P_{eq}+\frac{\mathrm{\Δ}T}{3600}\×P_{\mathrm{\Σ}o}\×\underset{t=1}{\overset{N}{\Σ}}{s}_t$

Wherein, in formula, N is the required sampled point judged in the time period, and △ T is sampling interval, s _tfor representing the numerical value (when circuit runs, its value is 1, and when circuit stops row, its value is 0) of circuit kth hour t period running status.

Suppose that the idle component of head end electric current is zero after desirable reactive-load compensation, former head end electric current is pressed geometry and form deduction reactive current after, adopt the method equal by substation transformer load factor provided in " power network line losses calculating directive/guide " to determine power load distributing again, survey calculation line loss electricity is out divided by the total delivery of the head end recorded in response time section thus, obtains zero idle line loss per unit (Δ A _eq0).

${\mathrm{\ΔA}}_{eq0}=\underset{t=1}{\overset{N}{\Σ}}\frac{\mathrm{\Δ}T}{3600}\×P_{eq0}+\frac{\mathrm{\Δ}T}{3600}\×P_{\mathrm{\Σ}o}\×\underset{t=1}{\overset{N}{\Σ}}{s}_t$

Wherein, in formula, N is the required sampled point judged in the time period, and △ T is sampling interval, s _tfor representing the numerical value (when circuit runs, its value is 1, and when circuit stops row, its value is 0) of circuit kth hour t period running status.

(6) line loss interval division is high loss zone, reactive management district and low-loss district;

Wherein high loss zone:

The region of 10kV circuit statistical line losses rate between max line loss rate and directive/guide line loss per unit.(comprising power load distributing) can be adjusted from the method for operation, change whether transformer is energy-conservation change transformer, circuit wire diameter) reduce medium-voltage line radius of electricity supply/path and) energy-saving potential of its each subitem of the aspect computational analysis such as adjustment three-phase imbalance, then, if namely above-mentioned measures energy-saving potential expects that network loss fall is followed successively by α _i(0≤α _i< 1), then synthesis energy saving potentiality are α Σ=[1-Π (1-α completely _i)] in ζ formula: ζ is discount factor, and for rejecting the energy-saving effect lap that many kinds of measures combined action causes, value is determined according to electrical network actual features and parameter optimization level.Show that circuit is implemented falling of various measure and damaged effect grading, implements difficulty grading and combination property grading, thus instruct 10kV circuit to plan accordingly, transform and running optimizatin, accomplish that lean manages;

Reactive management district:

The region of 10kV circuit statistical line losses rate between directive/guide line loss per unit and zero idle line loss per unit.By zero idle line loss per unit divided by directive/guide line loss per unit gained ratio (this value is less than or equal to 1), particularly by zero idle line loss per unit per hour divided by directive/guide line loss per unit gained ratio (this value is less than or equal to 1) per hour, indirectly can reflect the level of the idle operational management of distribution line, to take reducing loss measure as required.The ratio of each hour is more close to 1, and the situation of idle operational management is better.

Low-loss district:

The region of 10kV circuit statistical line losses rate between directive/guide line loss per unit and minimum line loss rate, illustrates that Controlling line loss is good, does not generally need further to fall and damages process.

Claims (2)

1. a 10kV circuit Energy efficiency evaluation method, is characterized in that: adopt following steps;

Step one: obtain 10kV circuit head end electric current, total active power, total reactive power data;

Step 2: the node-resistance matrix calculating 10kV circuit;

Step 3: utilize the method based on the support vector regression of particle swarm optimization algorithm to calculate the maxima and minima of described 10kV line loss power;

Step 4: calculate the max line loss rate of described 10kV circuit in institute's minute, minimum line loss rate;

Step 5: calculate the directive/guide line loss per unit of described 10kV circuit in institute's minute and zero inactivity line loss per unit;

Step 6: be high loss zone, reactive management district and low-loss district by line loss interval division;

Step 7: the directive/guide line loss per unit calculated in step 5 and zero inactivity line loss per unit and step 6 are compared, draws evaluation conclusion.

2. a kind of 10kV circuit Energy efficiency evaluation method according to claim 1, is characterized in that: described step 2 is specially;

The resistance of 2.1 calculating 10kV circuits and transformer;

2.2 form 10kV line node conductance matrix G, ask that G's is inverse, and obtaining 10kV node-resistance matrix R is:

$R=\left[\begin{array}{cc}{R}_n& R_{nm}\\ R_{mn}& R_m\end{array}\right]$

Wherein, n is the load bus number in power distribution network, and m is contact nodes, and in power distribution network the numbering of load bus prior to getting in touch with the numbering of node, R _nfor n is capable, the block matrice of square of n row, its diagonal element is the self-resistance of load bus, and off-diagonal element is the mutual resistance between load bus.