CN103400336A - Economy evaluation method based on network availability and extensibility - Google Patents

Abstract

The invention relates to a network use efficiency evaluation method in the power communication field, in particular to an economy evaluation method based on network availability and extensibility. The method adopts an optical network use efficiency model to perform economy evaluation. The optical network use efficiency model is realized based on network availability and network extensibility in combination with network costs. The method comprises the steps of 1) determining the network availability; 2) determining the network extensibility; and 3) determining the network costs. The economy evaluation method based on network availability and extensibility provided by the invention fully considers the characteristics of an optical network and the economic input is analyzed based on the network availability and extensibility to obtain a comprehensive evaluation result; and coefficients in the use efficiency method are normalized, the problem of dimension inconsistency is solved and the analysis result is enabled to be more simple.

Description

The Economic Analysis Method of a kind of availability Network Based and extendability

Technical field

The present invention relates to the network effective utilization appraisal procedure in power communication field, be specifically related to the Economic Analysis Method of a kind of availability Network Based and extendability.

Background technology

Communication of power system is the indispensable important component part of electric system, is the basis that electrical network is realized dispatching automation and management modernization, is the important technical of guaranteeing power grid security, economic load dispatching.Along with the demand of power business, constantly to build based on the Communication ray network of new technology, the scale of communication network is also going from strength to strength.The introducing of new network and the growth of network size, whether the communication service capabilities of bringing for the electrical production operation has lifting, the service ability of enhancing, namely the relation between network resource utilization and network organizing cost is how.Need a kind of index Evaluation Method, utilize the relation between network resource utilization and network organizing cost, carry out the economic index of evaluating network.It is a kind of Economic feasibility target method of supportability Network Based and expansion capability.

Summary of the invention

For the deficiencies in the prior art, the purpose of this invention is to provide the Economic Analysis Method of a kind of availability Network Based and extendability, the present invention takes into full account the characteristics of optical-fiber network, based on network availability and extendability, analyze its economic input, draw comprehensive evaluation result; Each coefficients by using normalized in the effective utilization method, solved the inconsistent problem of dimension, makes analysis result more succinct.

The objective of the invention is to adopt following technical proposals to realize:

The Economic Analysis Method of a kind of availability Network Based of the present invention and extendability, its improvements are, described method adopts optical-fiber network effective utilization model to carry out Economic Evaluation, optical-fiber network effective utilization model availability Network Based and extension of network, and in conjunction with network cost, realize, described method comprises the steps:

(1) determine the network availability;

(2) determine extension of network;

(3) determine network cost.

Wherein, described optical-fiber network effective utilization refers to the introducing due to optical-fiber network, is the communication service capabilities that the electrical production operation brings, and optical-fiber network uses the efficiency model to represent with following expression formula:

Light effective utilization=(network availability+extension of network)/network cost.

Wherein, in described step (1), the network availability refers to that network keeps acceptable quality of service ability, network node and cable link in network availability map network topology after bearing fault; Determine that the network availability comprises the steps:

1. determine the availability of network node;

2. determine the availability of lightguide cable link.

Wherein, described step 1. in, network node is comprised of the network equipment, the availability of the network equipment represents with following expression formula:

$R=e^{-t/\mathrm{MTBF}}$ (formula 1);

Wherein: R represents network equipment availability, _MTBFFor the mean free error time of the network equipment;

Described step 2. in, the availability of cable link is relevant with cable length, when 1 kilometer optical cable availability represents during with following expression: L kilometer optical cable availability Rl _inkRepresent with following expression formula:

R _link＝A ₁ ^L

$A_S=1-\underset{i=1}{\overset{N}{\mathrm{\Π}}}(1-A_i)$ (formula 2);

A=A _s

Wherein:

L is positive integer;

Specify the availability between two network nodes to be determined by the set of routes between two network nodes in network, the availability of certain cable link is A _i, this network node between availability A _SFor:

$A_S=1-\underset{i=1}{\overset{N}{\mathrm{\Π}}}(1-A_i)$ (formula 3);

Wherein: N is cable link number total in network;

Whole network availability A is:

$A=\stackrel{\‾}{A_s}$ (formula 4);

Wherein: Expression N bar cable link availability A _SMean value.

Wherein, in described step (2), extension of network refers to the utilization factor of current network resources, and the method for determining is that the capacity of the actual use of network accounts for the number percent of total volume in theory, and extension of network represents with following expression formula:

Extension of network=(the whole network has used the resource sum)/(the whole network available resources sum).

Wherein, in described step (3), network cost Cost refers to total input of networking financial cost, and total the input represents with following expression formula:

Cost=Cost _E+ Cost _B+ Cost _S(formula 5);

Wherein, Cost _EFor network equipment expense; Cost _BFor the network engineering construction cost; Cost _SFor the network operation expense.

Wherein, described network equipment expense comprises l ink resistance and node expense, with following expression formula, represents:

Cost _E=Cost _Link+ Cost _Node(formula 6);

Wherein: Cost _LinkFor l ink resistance, Cost _NodeFor the node expense; Expression formula is as follows respectively:

Cost _Link=C ₁* Lengh (formula 7);

Wherein: C ₁For the investment of unit length km, investing unit is unit;

Lengh is line length, and unit is km;

C ₀For public part investment, unit is unit, comprises power supply, fan and master control borad;

C _{Branch road}For the investment of branch road veneer, unit is unit;

N _{Branch road}For branch road integrated circuit board quantity;

C _CircuitFor the investment of circuit veneer, unit is unit;

N _CircuitFor circuit integrated circuit board quantity.

Wherein, described network engineering construction cost Cost _BFor 30% of network equipment expense, that is:

Cost _B=Cost _E* 30% (formula 9);

Described network operation expense Cost _SFor 8% of network equipment expense, that is:

Cost _S=(Cost _E+ Cost _B) * 8% (formula 10).

Wherein, network cost is carried out dimensionless process, expression formula is as follows:

$C=\frac{{\mathrm{Cost}}_{\mathrm{Link}}+{\mathrm{Cost}}_{\mathrm{Node}}+{\mathrm{Cost}}_B+{\mathrm{Cost}}_S}{N_{\mathrm{Node}}\×1000000}$ (formula 11);

Wherein: N _NodeThe quantity of expression network node.

Compared with the prior art, the beneficial effect that reaches of the present invention is:

The based on network supportability of Economic feasibility target method and the expansion capability of optical-fiber network effective utilization, in conjunction with availability and the extensibility of network, and take the economic cost of network as benchmark.The evaluation index of each parameter has taken into full account the characteristics of optical-fiber network, from network availability, extension of network and network gross investment, starts with, and has embodied the every aspect of optical-fiber network, draws comprehensive evaluation index.

In the effective utilization algorithm, each parameter has been used normalization processing method, makes evaluation result more can directly react the economy of optical-fiber network, and evaluation result is larger, illustrates that the effective utilization of network is higher.Under same economic input, obtain higher network use value.

Description of drawings

Fig. 1 is the process flow diagram of the Economic Analysis Method of availability Network Based provided by the invention and extendability;

Fig. 2 is the network availability schematic diagram of specific embodiment provided by the invention;

Fig. 3 is that the network of specific embodiment provided by the invention uses the resource schematic diagram.

Embodiment

Below in conjunction with accompanying drawing, the specific embodiment of the present invention is described in further detail.

Method provided by the invention adopts optical-fiber network effective utilization model to carry out Economic Evaluation, optical-fiber network effective utilization model availability Network Based and extension of network, and in conjunction with network cost, realize.The electrical network production run that is deployed as of optical-fiber network provides new business, the new platform that provides the foundation of applying, and therefore, the optical-fiber network effective utilization refers to the introducing due to optical-fiber network, and is the communication service capabilities that the electrical production operation brings, comprising:

1) network availability;

2) extension of network.

Be mainly reflected in the balance relation of cost investment and network availability and extendability according to optical-fiber network networking efficiency, optical-fiber network effective utilization model can be expressed as follows:

Optical-fiber network effective utilization=(network availability+extension of network)/network cost;

Finally draw effective utilization in optical-fiber network effective utilization model.Effective utilization is larger, illustrates that optical-fiber network is higher based on the economic index of supportability and expansion capability, and benefit is better.

The process flow diagram of the Economic Analysis Method of availability Network Based provided by the invention and extendability as shown in Figure 1, comprises the steps:

(1) determine the network availability: network availability general reference network is standing various faults, still can keep the ability of acceptable quality of service after even calamitous major break down.

Determine that the network availability comprises the steps:

1. determine the availability of network node:

The network availability, mainly for cable link, is the whole availability index of physical network, does not relate to concrete business information, here computing service availability not.The network availability only with the topology-aware of network, concrete corresponding key element is network node and link, but usually the network node fiduciary level has definite result, and manufacturer can provide the mean free error time MTBF value of the network equipment, and network equipment availability obtains by following expression:

$R=e^{-t/\mathrm{MTBF}}$ (formula 1);

Wherein: R represents network equipment availability, _MTBFFor the mean free error time of the network equipment.

2. determine the availability of lightguide cable link:

Usually, the equipment availability is all very high, and close to 1, so the availability of network is determined by link substantially.For the availability of link, the employing standard is the fiber failure model G.625, and fiduciary level and cable length are closely related.

When 1 kilometer optical cable availability represents during with following expression: L kilometer optical cable availability R _LinkRepresent with following expression formula:

R _link＝A ₁ ^L

$A_S=1-\underset{i=1}{\overset{N}{\mathrm{\Π}}}(1-A_i)$ (formula 2);

A=A _s

Wherein:

, L is positive integer;

Specify the availability between two network nodes to be determined by the set of routes between two network nodes in network, the availability of certain cable link is A _i, this network node between availability A _SFor:

$A_S=1-\underset{i=1}{\overset{N}{\mathrm{\Π}}}(1-A_i)$ (formula 3);

Wherein: N is cable link number total in network;

Whole network availability A is:

$A=\stackrel{\‾}{A_s}$ (formula 4);

Wherein:

Expression N bar cable link availability A _SMean value.

(2) determine extension of network: extension of network is presented as the Internet resources expandability, i.e. the utilization factor of current network resources, and the capacity of the actual use of network accounts for the number percent of total volume in theory.When network resource utilization reached capacity, Internet resources had the demand of dilatation, for its effective utilization of newly-built network, should recalculate.

Extension of network is weighed by the utilization factor of current network resources, and computing method are that the capacity of the actual use of network accounts for the number percent of total volume in theory.

Extension of network=(the whole network has used the resource sum)/(the whole network available resources sum).

(3) determine network cost: network cost refers to the optical-fiber network networking cost, comprises network construction cost (contain and buy cost of equipment and engineering construction cost) and network operation maintenance cost.The network investment cost refers to the required cost price of paying when disposing optical-fiber network; After the network operation maintenance cost referred to the real operation of optical-fiber network, operator need to safeguard the required cost of paying of optical-fiber network, as machine room cost, repairing expense and amortization of low cost and short lived articles and network management personnel's training expenses etc.; Coefficients by using dimensionless normalized.

Network cost Cost refers to total input of networking financial cost, and total the input represents with following expression formula:

Cost=Cost _E+ Cost _B+ Cost _S(formula 5);

Wherein, Cost _EFor network equipment expense, this expense is by l ink resistance and node expenditure pattern; Cost _BFor the network engineering construction cost; Cost _SFor the network operation expense.

Network equipment expense comprises l ink resistance and node expense, with following expression formula, represents:

Cost _E=Cost _Link+ Cost _Node(formula 6);

Wherein: Cost _LinkFor l ink resistance, Cost _NodeFor the node expense; Expression formula is as follows respectively:

Cost _Link=C ₁* Lengh (formula 7);

Wherein: C ₁For the investment of unit length km, investing unit is unit;

Lengh is line length, and unit is km;

C ₀For public part investment, unit is unit, comprises power supply, fan and master control borad;

C _{Branch road}For the investment of branch road veneer, unit is unit;

N _{Branch road}For branch road integrated circuit board quantity;

C _CircuitFor the investment of circuit veneer, unit is unit;

N _CircuitFor circuit integrated circuit board quantity.

Cost _BFor the network engineering construction cost, rule of thumb, its value is about this value of 30%(of equipment total price and also can be determined by the networking concrete condition) namely:

Cost _B=Cost _E* 30% (formula 9);

Described network operation expense Cost _SFor 8% of network equipment expense, that is:

Cost _S=(Cost _E+ Cost _B) * 8% (formula 10).

Wherein, network cost is carried out dimensionless process, expression formula is as follows:

$C=\frac{{\mathrm{Cost}}_{\mathrm{Link}}+{\mathrm{Cost}}_{\mathrm{Node}}+{\mathrm{Cost}}_B+{\mathrm{Cost}}_S}{N_{\mathrm{Node}}\×1000000}$ (formula 11);

N _Node

A _abc＝0.8×0.9＝0.72

A _ac＝0.95

A _adc＝0.75×0.85＝0.6375

A _ac＝1-(1-0.72)×(1-0.95)×(1-0.6375)＝0.994925

A _bad＝0.8×0.75＝0.6

A _bcd＝0.85×0.9＝0.765

A _bacd＝0.8×0.95×0.85＝0.6

A _bcad＝0.9×0.95×0.75＝0.64125

$A=\frac{1}{6}\mathrm{\Σ}{A}_s=\frac{1}{6}(0.8+0.9+0.85+0.75+0.995+0.998)=0.88$

Wherein: $A_{\mathrm{bd}}=1-\stackrel{\‾}{0.6}\×\stackrel{\‾}{0.765}\×\stackrel{\‾}{0.646}\×\stackrel{\‾}{0.64125}=0.988$ The quantity of expression network node.

Embodiment

Network as shown in Figure 2, be the SDH network of 4 node 10G, and every link availability provides, and whole network Calculation of Availability method is as follows:

Step 1: total AC, BD, AB, BC, 6 nodes pair such as CD, AD;

Step 2: wherein AB, BC, CD, AD are direct-connected limit, and its availability directly provides, and need not calculate;

Step 3: calculate respectively the availability between AC, DB node pair;

Between step 3-1:AC, route has three, is respectively: ABC, AC, ADC, and its availability is respectively:

A _abc＝0.8×0.9＝0.72；

A _ac＝0.95；

A _adc＝0.75×0.85＝0.6375；

: A _ac=1-(1-0.72) * (1-0.95) * (1-0.6375)=0.994925;

Between step 3-2:BD, route has four, is respectively: BAD, BCD, BACD, and its availability of BCAD is respectively:

A _bad＝0.8×0.75＝0.6；

A _bcd＝0.85×0.9＝0.765；

A _bacd＝0.8×0.95×0.85＝0.646；

A _bcad＝0.9×0.95×0.75＝0.64125；

: $A_{\mathrm{bd}}=1-\stackrel{\‾}{0.6}\×\stackrel{\‾}{0.765}\×\stackrel{\‾}{0.646}\×\stackrel{\‾}{0.64125}=0.988;$

Step 4: the network availability is:

$A=\frac{1}{6}\mathrm{\Σ}{A}_s=\frac{1}{6}(0.8+0.9+0.85+0.75+0.995+0.998)=0.88.$

The available resources of supposing the network single link are 10G, and as shown in Figure 3, the network scalability computing method are as follows for every link actual use resource and linkage length:

$K=\frac{6G+6G+2G+4G+4G}{5\×10G};$

K＝0.44。

In Fig. 3, the investment of every link unit length is 300 yuan/km.The public part investment of single node is 40000 yuan.The investment of branch road veneer is 20000 yuan, and the investment of circuit veneer is 30000 yuan.As shown in Figure 3, tributary card quantity is 0, and each node of circuit board quantity is different, and A, B, C and D are respectively 3,2,3 and 2.The computing method of network cost are as follows:

1. l ink resistance:

Cost _Link=C ₁×Lengh；

Cost _Link=300×(100+100+80+80+80)；

Cost _Link=132000 yuan.

2. node expense:

Because tributary card quantity is 0, so calculating formula is only considered single node public investments part and wiring board expense, and node A is identical with node C, and Node B is identical with node D.

Cost _Node＝(40000+30000×3)×2+(40000+30000×2)×2；

Cost _Node=460000 yuan.

3. network equipment expense:

Cost _E＝Cost _Link+Cost _Node；

Cost _E=132000+460000=592000 unit.

4. network engineering construction cost:

Cost _B＝Cost _E×30%；

Cost _B=592000 * 30%=177600 unit;

5. network operation expense:

Cost _S＝(Cost _E+Cost _B)×8%；

Cost _S=(592000+177600) * 8%=61568 unit;

6. always drop into:

Cost＝Cost _E+Cost _B+Cost _S；

Cost=592000+177600+61568=831168 unit;

7. always dropping into nondimensionalization processes:

$C=\frac{{\mathrm{Cost}}_{\mathrm{Link}}+{\mathrm{Cost}}_{\mathrm{Node}}+{\mathrm{Cost}}_B+{\mathrm{Cost}}_S}{N_{\mathrm{Node}}\×1000000};$

$C=\frac{\mathrm{Cost}}{N_{\mathrm{Node}}\×1000000};$

$C=\frac{831168}{4\×1000000}=0.21.$

The optical-fiber network effective utilization is as follows:

Effective utilization=(network availability+extension of network)/network cost;

Effective utilization=(A+K)/C;

Effective utilization=(0.88+0.44)/0.21=6.29.

The Economic feasibility target method of optical-fiber network effective utilization provided by the invention, take into full account the characteristics of optical-fiber network, and based on network availability and extendability, analyze its economic input, draws comprehensive evaluation result.Each coefficients by using normalized in the effective utilization method, solved the inconsistent problem of dimension, makes analysis result more succinct.

Should be noted that finally: above embodiment is only in order to illustrate that technical scheme of the present invention is not intended to limit, although with reference to above-described embodiment, the present invention is had been described in detail, those of ordinary skill in the field are to be understood that: still can modify or be equal to replacement the specific embodiment of the present invention, and do not break away from any modification of spirit and scope of the invention or be equal to replacement, it all should be encompassed in the middle of claim scope of the present invention.

Claims (9)

1. the Economic Analysis Method of an availability Network Based and extendability, it is characterized in that, described method adopts optical-fiber network effective utilization model to carry out Economic Evaluation, optical-fiber network effective utilization model availability Network Based and extension of network, and in conjunction with network cost, realize, described method comprises the steps:

(1) determine the network availability;

(2) determine extension of network;

(3) determine network cost.

2. Economic Analysis Method as claimed in claim 1, is characterized in that, described optical-fiber network effective utilization refers to the introducing due to optical-fiber network, is the communication service capabilities that the electrical production operation brings, and optical-fiber network uses the efficiency model to represent with following expression formula:

Light effective utilization=(network availability+extension of network)/network cost.

3. Economic Analysis Method as claimed in claim 1, it is characterized in that, in described step (1), the network availability refers to that network keeps acceptable quality of service ability, network node and cable link in network availability map network topology after bearing fault; Determine that the network availability comprises the steps:

1. determine the availability of network node;

2. determine the availability of lightguide cable link.

4. Economic Analysis Method as claimed in claim 3, is characterized in that, described step 1. in, network node is comprised of the network equipment, the availability of the network equipment represents with following expression formula:

$R=e^{-t/\mathrm{MTBF}}$ (formula 1);

Wherein: R represents network equipment availability, _MTBFFor the mean free error time of the network equipment;

Described step 2. in, the availability of cable link is relevant with cable length, when 1 kilometer optical cable availability represents during with following expression:

L kilometer optical cable availability R _LinkRepresent with following expression formula:

R _link＝A ₁ ^L

$A_S=1-\underset{i=l}{\overset{N}{\mathrm{\Π}}}(1-A_i)$ (formula 2);

A=A _s

Wherein:

L is positive integer;

Specify the availability between two network nodes to be determined by the set of routes between two network nodes in network, the availability of certain cable link is A _i, this network node between availability A _SFor:

$A_S=1-\underset{i=l}{\overset{N}{\mathrm{\Π}}}(1-A_i)$ (formula 3);

Wherein: N is cable link number total in network;

Whole network availability A is: $A=\stackrel{\‾}{A_s}$ (formula 4);

Wherein:

Expression N bar cable link availability A _SMean value.

5. Economic Analysis Method as claimed in claim 1, it is characterized in that, in described step (2), extension of network refers to the utilization factor of current network resources, the method of determining is that the capacity of the actual use of network accounts for the number percent of total volume in theory, and extension of network represents with following expression formula:

Extension of network=(the whole network has used the resource sum)/(the whole network available resources sum).

6. Economic Analysis Method as claimed in claim 1, is characterized in that, in described step (3), network cost Cost refers to total input of networking financial cost, and total the input represents with following expression formula:

Cost=Cost _E+ Cost _B+ Cost _S(formula 5);

Wherein, Cost _EFor network equipment expense; Cost _BFor the network engineering construction cost; Cost _SFor the network operation expense.

7. Economic Analysis Method as claimed in claim 6, is characterized in that, described network equipment expense comprises l ink resistance and node expense, with following expression formula, represents:

Cost _E=Cost _Link+ Cost _Node(formula 6);

Wherein: Cost _LinkFor l ink resistance, Cost _NodeFor the node expense; Expression formula is as follows respectively:

Cost _Link=C ₁* Lengh (formula 7);

(formula 8);

Wherein: C ₁For the investment of unit length km, investing unit is unit;

Lengh is line length, and unit is km;

C ₀For public part investment, unit is unit, comprises power supply, fan and master control borad;

C _{Branch road}For the investment of branch road veneer, unit is unit;

N _{Branch road}For branch road integrated circuit board quantity;

C _CircuitFor the investment of circuit veneer, unit is unit;

N _CircuitFor circuit integrated circuit board quantity.

8. Economic Analysis Method as claimed in claim 6, is characterized in that, described network engineering construction cost Cost _BFor 30% of network equipment expense, that is:

Cost _B=Cost _E* 30% (formula 9);

Described network operation expense Cost _SFor 8% of network equipment expense, that is:

Cost _S=(Cost _E+ Cost _B) * 8% (formula 10).

9. Economic Analysis Method as described in any one in claim 6-8, is characterized in that, network cost carried out dimensionless process, and expression formula is as follows:

$C=\frac{{\mathrm{Cost}}_{\mathrm{Link}}+{\mathrm{Cost}}_{\mathrm{Node}}+{\mathrm{Cost}}_B+{\mathrm{Cost}}_S}{N_{\mathrm{Node}}\×1000000}$ (formula 11);

Wherein: N _NodeThe quantity of expression network node.

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