CN105046573A - Electric power planning-oriented method for assessing power loss of electric power system - Google Patents

Abstract

The invention relates to an electric power planning-oriented method for assessing power loss of electric power system. The electric power planning-oriented method for assessing power loss of electric power system comprises the steps: 1) performing system operation simulation according to the acquired information; 2) obtaining the power net injection of each node according to the power output of a set and the load of each node; 3) forming a generator transfer distribution factor matrix according to the power transmission line planning, wherein the matrix is a row matrix; calculating the power flow of each line and a transformer according to the transfer distribution factor matrix and the power net injection of each node of the system; and 4) obtaining the hourly power loss value of each line and the transformer according to the power flow, and parameters of the lines and the transformer. The electric power planning-oriented method for assessing power loss of electric power system uses a direct current power flow model to simulate operation of the electric power system, and is simple in algorithm and is provided with accuracy at the same time.

Description

A kind of electric system network loss appraisal procedure towards power planning

Technical field

The present invention relates to Power System Analysis field, particularly relate to a kind of electric system network loss appraisal procedure towards power planning.

Background technology

Network Loss Rate is the very important comprehensive economic index of of operation of power networks, the economy of its reflection operation of power networks.Network Loss Rate is lower, and the Quality degree of effective utilization of generation assets is higher, and the income of electric power enterprise is larger.Reduce the service efficiency that Network Loss Rate can improve electric energy, economize energy, reduce power supply cost.Therefore line losses management damages that to analyze be the important process that operation of power networks is analyzed with falling.

At present, existing more document expands research to the analysis of electric system network loss and computational problem.Mu Gang etc. (1995) propose a kind of network loss probability analysis method, assess with comparatively comprehensive and accurate the Energy loss to power transmission network and Changing Pattern thereof; Mu Gang etc. (1998) propose the another kind of line losses management method based on Power loss probability distribution function, and have carried out actual verification on one transprovincially power transmission network; Liu Huanzhi etc. (2003) give line losses management and a practical approach of sharing in Regional Electric Market; Permitted the theoretical calculation method that Chinese equality (2003) then proposes a kind of grid line loss of utilization state data estimator; More than to defend the country etc. (2006) analyze distribution and the formation of grid line loss, discuss the main countermeasure reducing line loss; Lu Zhi has just waited (2008) to give a kind of Power system state estimation result of Direct neural dynamic programming that utilizes to calculate the method for line loss; Network loss is included in the reliability assessment of generating and transmitting system by Xie Shaoyu etc. (2011), discloses the impact of network loss on Reliability Index; Gao Weidong etc. (2012), in conjunction with the actual conditions of current power system, provide a kind of method for solving of practicality for monthly actual line loss rate; Network loss key element is included in electric power system dispatching problem by Zhong Haiwang etc. (2013), proposes a kind of dynamic economic dispatch model and method of embedded network loss.

Above-mentioned electric system line losses management method otherwise algorithm too complicated, or network loss assessment cannot be carried out for the system in power planning, therefore need one towards the not only easy of power planning but also network loss appraisal procedure accurately.

Operation of Electric Systems simulation is prior art in power planning, and object is in the adaptability of the management and running evaluating system of planning stage analog electrical Force system reality and economy.Its input data are system installation planning, and system line is planned, system loading information of forecasting, the agreement power-supply curve of outer incoming call.The output of Operation of Electric Systems simulation is that the plan of each hour each unit of target simulation time is exerted oneself.Working train family mainly comprises unit maintenance scheduling, new forms of energy exert oneself stochastic simulation and unit plan two modules day by day.The method adopted mainly sets up Optimized model, the method for solving-optimizing model.

Electric system network loss appraisal procedure towards power planning in this paper, is above-mentioned electric power system operation analogy method, can carries out network loss assessment comparatively accurately, easily to for Power System Planning scheme.

Summary of the invention

The object of the invention is the deficiency overcoming above prior art, provides a kind of electric system network loss appraisal procedure towards power planning, specifically has following technical scheme to realize:

The described electric system network loss appraisal procedure towards power planning, comprises the steps:

1) obtain genset planning, transmission tine planning, the load curve in service system assessment objective time and interconnection and send powered information, the information according to described acquisition carries out system operation simulation;

2) according to unit output P ^i,t _outputand each node load D ^j,t _output, show that each node power injects only; Wherein, j represents node ID, j=1,2 ..., J, J are total node number, and t represents period sequence number, t=1,2 ..., 8760;

3) form generator transfer distribution factor matrix according to transmission tine planning, this matrix is the capable J column matrix of L, and wherein L is branch road sum, and the capable jth of note transfer distribution factor matrix l is classified as G _l,j, according to G _l,jand each node power of system injects each node trend, calculates the trend of each circuit and transformer;

4) carry out line losses management according to circuit with transformer parameter and trend corresponding respectively, obtain each circuit, the transformer network loss value of each hour.

The further design of the described electric system network loss appraisal procedure towards power planning is, described step 1) in described information comprise each unit P that exerts oneself of each hour ^i,t _output, i represents unit sequence number, i=1,2 ..., I, I are the total number of units of unit, and t represents period sequence number, t=1,2 ..., 8760.

The further design of the described electric system network loss appraisal procedure towards power planning is, described step 2) in obtain each node power by formula 1 and only inject:

${P^{j,t}}_{\mathrm{inject}}=\underset{i\∈j}{\mathrm{\Σ}}{P^{i,t}}_{\mathrm{output}}+{D^{j,t}}_{\mathrm{output}}---\left(1\right)$

Wherein, P ^j,t _injectfor each node trend is injected only, j represents node ID, j=1,2 ..., J, J are total node number, and t represents period sequence number, t=1,2 ..., 8760, i ∈ j represents that unit i is articulated on node j.

The further design of the described electric system network loss appraisal procedure towards power planning is, described step for each period t=1,2 ..., 8760, according to G _l,jand each node power of system injects P ^j,t _inject, the trend of l article of branch road is determined by formula 2:

${P^{l,t}}_{\mathrm{flow}}=\underset{j=1}{\overset{J}{\mathrm{\Σ}}}{G}_{l,j}{P^{j,t}}_{\mathrm{inject}}---\left(2\right)$

The further design of the described electric system network loss appraisal procedure towards power planning is, described step 4) in, if l branch road is power transmission line, then the active power loss S of l article of circuit t period ^t _{l, (i-j)}can be determined by formula (3):

${S^t}_l=\left(\frac{r_l{x_l}^2}{{x_l}^2+{r_l}^2}{{P^{l,t}}_{\mathrm{flow}}}^2\right)S_B---\left(3\right)$

Wherein, r _land x _lbe respectively the resistance of circuit, reactance, S _bfor circuit capacity base value.

If l branch road is transformer, the loss of transformer comprises dynamic loss and quiescent dissipation, its total losses such as formula (4),

S ^t=S ^t _static+ S ^t _dynamically(4)

Wherein

R _land x _lbe respectively the resistance of transformer, reactance, S _bfor circuit capacity base value, P _{l, static}for the open circuit loss in the transformer unit interval, T is transformer year total run time.

Advantage of the present invention is as follows:

1, use DC flow model to carry out Operation of Electric Systems simulation, algorithm does not simply lose accuracy again;

2, towards Power System Planning, network loss assessment comprehensively and accurately can be provided to systems organization scheme.

Accompanying drawing explanation

Fig. 1 is line losses management process flow diagram.

Embodiment

Below in conjunction with accompanying drawing, the present invention program is described in detail.

Towards the electric system network loss appraisal procedure of power planning, comprise the steps:

1) obtain genset planning, transmission tine planning, the load curve in service system assessment objective time and interconnection and send powered information, the information according to obtaining carries out system operation simulation.

2) according to unit output P ^i,t _outputand each node load D ^j,t _output, show that each node power injects only, wherein, j represents node ID, j=1,2 ..., J, J are total node number, and t represents period sequence number, t=1,2 ..., 8760.

3) form generator transfer distribution factor matrix according to transmission tine planning, this matrix is the capable J column matrix of L, and wherein L is branch road sum, and the capable jth of note transfer distribution factor matrix l is classified as G _l,j, according to G _l,jand each node power of system injects P ^j,t _inject, calculate each circuit and transformer trend.

4) according to trend P ^l,t _flowand circuit and transformer parameter carry out line losses management, obtain each circuit, the transformer network loss value of each hour.

The further design of the electric system network loss appraisal procedure towards power planning of the present embodiment is, step 1) in information comprise each unit P that exerts oneself of each hour ^i,t _output, i represents unit sequence number, i=1,2 ..., I, I are the total number of units of unit, and t represents period sequence number, t=1,2 ..., 8760.

Further design towards the electric system network loss appraisal procedure of power planning is, step 2) in obtain each node power by formula 1 and only inject:

${P^{j,t}}_{\mathrm{inject}}=\underset{i\∈j}{\mathrm{\Σ}}{P^{i,t}}_{\mathrm{output}}+{D^{j,t}}_{\mathrm{output}}---\left(1\right)$

Wherein, P ^j,t _injectfor each node trend is injected only, j represents node ID, j=1,2 ..., J, J are total node number, and t represents period sequence number, t=1,2 ..., 8760, i ∈ j represents that unit i is articulated on node j.

Further design towards the electric system network loss appraisal procedure of power planning is, step for each period t=1,2 ..., 8760, according to G _l,jand each node power of system injects P ^j,t _inject, for l article of branch road, its trend is determined by formula 2:

${P^{l,t}}_{\mathrm{flow}}=\underset{j=1}{\overset{J}{\mathrm{\Σ}}}{G}_{l,j}{P^{j,t}}_{\mathrm{inject}}---\left(2\right)$

Further design towards the electric system network loss appraisal procedure of power planning is, step 4) in, if l branch road is power transmission line, then the active power loss S of l article of circuit t period ^t _{l, (i-j)}can be determined by following formula:

${S^t}_l=\left(\frac{r_l{x_l}^2}{{x_l}^2+{r_l}^2}{{P^{l,t}}_{\mathrm{flow}}}^2\right)S_B$

Wherein, r _land x _lbe respectively the resistance of circuit, reactance, S _bfor circuit capacity base value.

If l branch road is transformer, the loss of transformer comprises dynamic loss and quiescent dissipation, and its total losses are:

S ^t=S ^t _static+ S ^t _dynamically

${S^t}_{l,\mathrm{dynamic}}=\left(\frac{r_l{x_l}^2}{{x_l}^2+{r_l}^2}{{P^{l,t}}_{\mathrm{flow}}}^2\right)S_B$

S ^t _l,static＝P _l,static·T

Wherein, r _land x _lbe respectively the resistance of transformer, reactance, S _bfor circuit capacity base value, P _{l, static}for the open circuit loss in the transformer unit interval, T is transformer year total run time.

In conjunction with concrete example, the present invention is conducted further description:

Working train family calculating was carried out to Jiangsu Power Grid in 2012.Calculate, within 2012, Jiangsu Power Grid total system network loss is 101.56 hundred million kWh, and Energy loss is 1.2495% with the ratio of system power consumption.

By the size of regional analysis network loss, Jiangsu Power Grid is divided into 500kV (comprising 1000kV) and 220kV two voltage levels, wherein, 500kV layer is containing comprising the circuit of extra-high voltage, 1000kV/500kV transformer, 500kV circuit and 500kV/220kV transformer, 220kV layer divides by area, is divided into Xuzhou, Lianyun Harbour, Suqian, Huaian, Yancheng, Yangzhou, Taizhou, Nantong, Nanjing, Zhenjiang, Changzhou, Wuxi, region, 13, Suzhou.Jiangsu Power Grid zones of different 200kV circuit network loss parameter comparison is as shown in table 1.

Table 1 Jiangsu Power Grid 12 programme

Can find out: electricity consumption mainly concentrates on Su Zhong tri-city, Suzhou, Wuxi; Network loss mainly concentrates on Suzhou, Nanjing, Xuzhou; Suzhou network loss is comparatively large, but the power consumption of correspondence is also comparatively large, and Network Loss Rate is also comparatively average, and Xuzhou is sent outside due to a large amount of electric energy, even if power consumption is few, but loss is many, causes Network Loss Rate higher.

From circuit types dimension, according to the actual conditions of Jiangsu Power Grid, consider following three kinds of different circuit typess: 500KV circuit, 500KV/220KV transformer, 220KV circuit.Different circuit types network loss parameter comparison is as shown in table 2.

Table 2 Jiangsu Power Grid 12 programme dissimilar circuit network loss parameter comparison

Claims (5)

1., towards an electric system network loss appraisal procedure for power planning, it is characterized in that, comprise the steps:

1) obtain genset planning, transmission tine planning, the load curve in service system assessment objective time and interconnection and send powered information, the information according to described acquisition carries out system operation simulation;

2) according to unit output P ^i,t _outputand each node load D ^j,t _output, show that each node power injects only; Wherein, j represents node ID, j=1,2 ..., J, J are total node number, and t represents period sequence number, t=1,2 ..., 8760;

3) form generator transfer distribution factor matrix according to transmission tine planning, this matrix is the capable J column matrix of L, and wherein L is branch road sum, and the capable jth of note transfer distribution factor matrix l is classified as G _l,j, according to G _l,jand each node power of system injects each node trend, calculates the trend of each circuit and transformer;

4) carry out line losses management according to circuit with transformer parameter and trend corresponding respectively, obtain each circuit, the transformer network loss value of each hour.

2. the electric system network loss appraisal procedure towards power planning according to claim 1, is characterized in that described step 1) in described information comprise each unit P that exerts oneself of each hour ^i,t _{output, i}represent unit sequence number, i=1,2 ..., I, I are the total number of units of unit, and t represents period sequence number, t=1,2 ..., 8760.

3. the electric system network loss appraisal procedure towards power planning according to claim 1, is characterized in that described step 2) in obtain each node power by formula 1 and only inject:

${P^{j,t}}_{\mathrm{inject}}=\underset{i\∈j}{\mathrm{\Σ}}{P^{i,t}}_{\mathrm{output}}+{D^{j,t}}_{\mathrm{output}}---\left(1\right)$

Wherein, P ^j,t _injectfor each node trend is injected only, j represents node ID, j=1,2 ..., J, J are total node number, and t represents period sequence number, t=1,2 ..., 8760, i ∈ j represents that unit i is articulated on node j.

4. the electric system network loss appraisal procedure towards power planning according to claim 1, is characterized in that described step is for each period t=1,2 ..., 876, according to G _l,jand each node power of system injects P ^j,t _inject, the trend of l article of branch road is determined by formula 2.

${P^{l,t}}_{\mathrm{flow}}=\underset{j=1}{\overset{J}{\mathrm{\Σ}}}{G}_{l,j}{P^{j,t}}_{\mathrm{inject}}---\left(2\right)$

5. the electric system network loss appraisal procedure towards power planning according to claim 1, is characterized in that described step 4) in,

If l branch road is power transmission line, then the active power loss S of l article of circuit t period ^t _{l, (i-j)}can be determined by formula (3):

${S^t}_l=\left(\frac{r_l{x_l}^2}{{x_l}^2+{r_l}^2}{{P^{l,t}}_{\mathrm{flow}}}^2\right)S_B---\left(3\right)$

Wherein, r _land x _lbe respectively the resistance of circuit, reactance, S _bfor circuit capacity base value.

If l branch road is transformer, the loss of transformer comprises dynamic loss and quiescent dissipation, its total losses such as formula (4),

S ^t=S ^t _static+ S ^t _dynamically(4)

Wherein

R _land x _lbe respectively the resistance of transformer, reactance, S _bfor circuit capacity base value, P _{l, static}for the open circuit loss in the transformer unit interval, T is transformer year total run time.