CN102760195B - Topology design method and device of current collecting system of offshore wind farm - Google Patents
Topology design method and device of current collecting system of offshore wind farm Download PDFInfo
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- CN102760195B CN102760195B CN201210272494.XA CN201210272494A CN102760195B CN 102760195 B CN102760195 B CN 102760195B CN 201210272494 A CN201210272494 A CN 201210272494A CN 102760195 B CN102760195 B CN 102760195B
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Abstract
The invention provides a topology design method and a topology design device of a current collecting system of an offshore wind farm. The topology design method comprises the following steps of: generating topological structures meeting the constraint conditions according to input information of a user and various constraint conditions; carrying out load flow calculation on the generated topological structures, obtaining line current values on all the topological structures, and selecting the types of cables and switches of corresponding lines; calculating the economy cost of all the topological structures according to the investment cost and the maintenance cost of the cables and switches selected; calculating the reliability cost of all the topological structures according to the fault occurrence probability of the selected cables and switches; and carrying out sequencing on all the topological structures according to the economy cost and the reliability cost or simultaneous consideration of the comprehensive cost of the economy cost and the reliability cost, and selecting the topological structures with preset quantity for output. The topology design method and the topology design device have the advantages that automatic design of the topological structures of the current collecting system of the offshore wind farm is realized by a computer, so that the investment on labor, cost and time is greatly saved.
Description
Technical field
The present invention relates to field of power, particularly relate to a kind of marine wind electric field slip ring system topology design method and a kind of marine wind electric field slip ring system topology design device.
Background technology
Along with the minimizing of the conventional energy resourcess such as oil, coal, new forms of energy have caused the attention of countries in the world.Wherein, wind-power electricity generation is world today's utilization of new energy resources form with the fastest developing speed.
Wind-power electricity generation mainly comprises land wind-powered electricity generation and offshore wind farm.Along with hastening towards saturation day of land wind-powered electricity generation, various countries turn one's attention to offshore wind farm one after another.Yet along with the continuous increase of marine wind electric field scale, in some early stage marine wind electric fields, peripheral issue can not be left in the basket now again, marine wind electric field slip ring system topology design is one of them.
Marine wind electric field slip ring system is comprised of cable and switchgear, and the inner wind-powered electricity generation unit of wind energy turbine set is coupled together by certain mode, mainly works to collect electric energy, is the important component part of marine wind electric field.Marine wind electric field slip ring system topological structure refers to the connected mode of the inner wind-powered electricity generation unit of marine wind electric field slip ring system.Different slip ring system topological structures, its financial cost and unfailing performance are different.Marine wind electric field slip ring system topology design is that the topological structure of marine wind electric field slip ring system is designed, and considers its financial cost and unfailing performance in design process, the optimum topology scheme of seeking to satisfy condition.
Traditional marine wind electric field slip ring system topology design method, adopts artificial mode to carry out topology design, causes the input ratio of manpower, financial resources and time larger.Especially along with marine wind electric field apoplexy group of motors quantity increasing, meet engineering and apply the slip ring system topology quantity of many tree structures and be explosive increase, this has brought difficulty to especially artificial design.
Summary of the invention
For addressing the above problem, the invention provides a kind of marine wind electric field slip ring system topology design method and device, the input that can save manpower, financial resources and time.
For achieving the above object, the present invention adopts following technical scheme:
A marine wind electric field slip ring system topology design method, comprises the following steps:
According to user's input information and various constraint condition, generate the topological structure that meets constraint condition;
Each generated topological structure is carried out to trend calculating, draw the line electricity flow valuve on each topological structure, and select accordingly the cable of corresponding line, the model of switch;
According to the cost of investment of selected cable, switch and maintenance cost, calculate the economy cost of each topological structure;
According to selected cable, the fault rate of switch, calculate the reliability cost of each topological structure;
According to described economy cost, reliability cost or consider that the integrated cost of economy cost and reliability cost sorts to each topological structure simultaneously, select the topological structure of predetermined quantity to export.
A marine wind electric field slip ring system topology design device, comprising:
Initial topology structural generation module, for according to user's input information and various constraint condition, generates the topological structure that meets constraint condition;
Model is selected module, for each topological structure to generated, carries out trend calculating, draws the line electricity flow valuve on each topological structure, and selectes accordingly the cable of corresponding line, the model of switch;
Economy pricing module, for according to the cost of investment of selected cable, switch and maintenance cost, calculates the economy cost of each topological structure;
Reliability cost computing module, for according to selected cable, the fault rate of switch, calculates the reliability cost of each topological structure;
Sequence and output module, for according to described economy cost, reliability cost or consider that the integrated cost of economy cost and reliability cost sorts to each topological structure simultaneously, the topological structure of selection predetermined quantity is exported.
By above scheme, can find out, marine wind electric field slip ring system topology design method of the present invention and device, first list the topological structure satisfying condition as much as possible, then carry out trend and calculate selected cable and switch model, carry out again economy pricing and reliability cost and calculate, finally export topological structure some, that meet user's request.Method of the present invention and device have been realized Automated Design marine wind electric field slip ring system topological structure being carried out by computing machine, effectively replace traditional marine wind electric field slip ring system and adopted the mode of topology design of manually carrying out, thereby saved greatly the input of manpower, financial resources and time, and can adapt to the trend of marine wind electric field slip ring system topology quantity explosive increase.
Accompanying drawing explanation
Fig. 1 is the schematic flow sheet of a kind of marine wind electric field slip ring system of the present invention topology design method;
Fig. 2 is according to the topological connection diagram that considers and finally draw after optimizing in embodiment;
Fig. 3 is the structural representation of a kind of marine wind electric field slip ring system of the present invention topology design device.
Embodiment
Below in conjunction with accompanying drawing and specific embodiment, technical scheme of the present invention is further described.
Embodiment mono-
Shown in Figure 1, a kind of marine wind electric field slip ring system topology design method, comprises the following steps:
Step S101, according to user's input information and various constraint condition, generates the topological structure that meets constraint condition.It should be noted that, the topological structure herein generating is only initial topology structure, is not final design result, and therefore it here can be set generates topological structure as much as possible, to facilitate, searches out overall optimum topology.
As a good embodiment, described user's input information can comprise: the coordinate of offshore wind farm field information, blower fan and transformer station, cable library information, switch library information and wind-powered electricity generation unit information etc.
As a good embodiment, described constraint condition can comprise: the constraint condition that the constraint condition of acquiescence, user arrange etc.Wherein, the constraint condition of described acquiescence mainly comprises:
(1) tree structure is divided number restriction;
(2) total volume of circuit restriction; A limit of slip ring system topology can not surpass its power delivery upper limit P
limit, being generally 30-40MW, concrete numerical value is depending on optional cable situation:
MaxP
i≤P
limit
Wherein, P
ibe the power of i bar limit transmission, P
limitpeak power limit value for respective lines.In the situation that blower fan rated power is certain, this constraint condition can be converted to: the restriction of connect Vertex number from the branch of root node.
(3) slip ring system topology line intersection restriction; Be that intersecting can not appear in slip ring system topology line, wherein line occurs intersecting to be proved to be not meeting economy principle of optimality, does not also meet engineering reality simultaneously.
In addition, the constraint condition that described user arranges mainly comprises:
(1) forbid connecting the wind-powered electricity generation unit that can not connect;
(2) initialization connects, the wind-powered electricity generation unit that must connect.
As a good embodiment, the process that described generation meets the topological structure of constraint condition specifically can comprise: adopt the Optimum search algorithm based on graph theory minimum spanning tree, generate the topological structure that meets constraint condition of default number.For a medium-sized marine wind electric field, only need booster stations just can meet the demands, in the process of simultaneously optimizing at topological line, only considering that the difference of circuit section with path planning changes this situation and just can make topological line optimize convergence optimum solution more.This improved minimal spanning tree algorithm that the present invention adopts, has following advantage:
One, can within the shortest time, list the topological structure that meets constraint condition as much as possible, search out overall optimum topology;
Two, can calculate trend according to every kind of topological structure and determine circuit section, economy model is tallied with the actual situation more;
Three, can calculate topological economy and reliability index simultaneously, be conducive to comprehensive economy and reliability index is selected topological structure.
Evidence, algorithm of the present invention has been considered the actual conditions of marine wind electric field slip ring system design, to marine wind electric field slip ring system, design is well suited for.
Step S102, carries out trend calculating to each generated topological structure, draws the line electricity flow valuve (being the current value that each current collection cable flows through) on each topological structure, and selectes accordingly the cable of corresponding line, the model of switch.
While doing trend calculating, for practical consideration, model is done to following approximate processing, think that approx slip ring system cable change in voltage along the line is little and all power of fan factors equal., as a good embodiment, can adopt following formula to calculate described line electricity flow valuve:
Wherein, I
ibe the electric current on i bar limit, P
jfor the load of summit j, U
nfor slip ring system rated line voltage, β is the set of all nodes in downstream on i bar limit.
Step S103, according to the cost of investment of selected cable, switch and maintenance cost, carries out economy calculating to above-mentioned all rational slip ring system topological structures, calculates the economy cost of each topological structure.Wherein, to the calculating of economy, be mainly cost of investment and the maintenance cost of considering slip ring system, comprise the cost of investment of cable and switchgear and maintenance cost etc.
Method of the present invention, when calculating slip ring system economic performance, will be set as the Life cycle of wind energy turbine set computing time, and the economy cost calculating is like this more accurate.
Step S104, according to selected cable, the fault rate of switch, calculates the reliability cost of each topological structure.Different from cost of investment and maintenance cost, reliability is not the expenditure (not considering rehabilitation cost) that embodies cost on the impact of slip ring system topological structure economy, but is embodied in the minimizing of income.That is to say, when subsea cable breaks down, cause the blower fan can not normal power generation, be just equivalent to wind energy turbine set and during breakdown maintenance, lost corresponding revenue from dues.This phenomenon meets the opportunity cost concept in economics, therefore can be called fault opportunity cost.
The detailed process of calculating described reliability cost (being fault opportunity cost) is described below:
As a good embodiment, what the present invention adopted is according to indexs such as topoligical equivalence outage rate (Qn), year expected loss of loads (EENS), to assess the reliability of slip ring system.Wherein:
EENS＝∑P
AI×Q
n×8760
In above-mentioned formula, Q
nfor n Fans forms the equivalent outage rate of slip ring system topology; ELGC represents is the performance number that slip ring system topological structure sends while considering various fault, and it can represent with the sum of products of the corresponding performance number of topology under various probabilities of malfunction and this fault; p
ifor there is the probability that i kind fault occurs, q in topology
ithe performance number that topology is sent when breaking down i; P
nrated power for every Fans; EENS represents a year expected loss of load; P
aIfor wind field total volume.
There have been several indexs above, can have calculated reliability cost C
cost: C
cost=λ * EENS; λ is the rate for incorporation into the power network of wind energy turbine set.
Formula arranges above, and we can be described as the reliability cost that adopts following formula to calculate:
Existing description before the meaning of each parameter representative of above formula, so locate that it will not go into details.
In addition, above-mentioned, while carrying out Calculation of Reliability, user can also carry out the configuration (traditional switch configuration and switch configuration completely) of relevant reliability setting (consider fan trouble or do not consider fan trouble) and switch allocation plan in advance.Wherein, traditional switch configuration is that branch road and bus rod junction are provided with a switch, between all the other local blower fans, only by cable, is connected; Completely switch configuration is that fan outlet place is connected with two load switches, between blower fan and blower fan, except cable also has switch, is connected.
Slip ring system Calculation of Reliability in the present embodiment, tool has the following advantages:
One, considered that topological classification has chain, tree-like two kinds of forms, has contained all topological forms of marine wind field slip ring system substantially;
Two, the probability every kind of careful consideration cable of topological structure being broken down, the probability that switch breaks down, the situation of the probability that blower fan breaks down (optional), result of calculation is accurate, is suitable for the occasion of accurate Calculation topology reliability;
Three, every kind of topology has been considered to traditional switch configures and two kinds of situations of switch configuration are completely assessed topological reliability.
Step S105, according to described economy cost, reliability cost or consider that the integrated cost of the two (being economy cost and reliability cost) sorts to each topological structure simultaneously, selects the topological structure of predetermined quantity to export.It is pointed out that described integrated cost refers to weighting value between economy cost and reliability cost and calculates, the cost drawing after two kinds are taken into account simultaneously, the numerical value of concrete weights can need oneself to set according to user.
In addition, after obtaining final slip ring system topology diagram, user can also make local modification to the slip ring system topological diagram having generated, and at this moment needs to recalculate the various parameters of this topology, and re-starts relatively sequence with the topology having generated.
It should be noted that, the present invention can realize the marine wind electric field slip ring system topology design containing the single booster stations of 200 typhoon group of motors, but because underlying algorithm restriction wouldn't be supported the marine wind electric field current collection topology design of multi-Substation, as supported Large Scale Offshore Wind Farm Mechatronic Systems topology design more than 200 typhoon group of motors due to underlying algorithm and hardware configuration restriction.
Method of the present invention has following characteristic:
(1) can realize the marine wind electric field slip ring system topology design containing the single booster stations of 200 typhoon group of motors;
(2) unfailing performance of slip ring system is converted to fault opportunity cost, reliability index is converted to economic index, with economic index, weigh the impact of wind field reliability on financial cost;
(3) can newly-built a plurality of wind energy turbine set information, or to the newly-built Multi-instance of same wind energy turbine set, carry out respectively computational analysis;
(4) user can arrange wind field information, and the parameter information of transformer station and wind-powered electricity generation unit under this wind field is set in selected movable wind field;
(5) user can forbid connecting to doing between some the blower fan point in current active wind field according to the needs of engineering reality, when topological line, thinks that forbidding connecting at 2 cannot be connected;
(6) user can arrange the parameter of cable storehouse, switch storehouse and wind-powered electricity generation unit etc., and in each case history design, selects to participate in the blower fan of design, the model of cable and switch;
(7) user can do initial connection to some blower fan point,, before starting calculating, thinks that some point must link up, and carries out topological line on this basis;
(8) user can choice set electric system topology be traditional switch configuration, or switch configuration completely;
(9), when user can calculate slip ring system reliability, selection is consider fan trouble or do not consider fan trouble;
(10) user can be according to the needs of oneself, select the method to slip ring system topological sorting: preferential according to economy, or reliability is preferential, or consider the topological diagram that economy and reliability select to meet objective function requirement;
(11) can revise the slip ring system topology diagram that generated, as change between topology circuit connection or change topological selected cable switch model, and recalculate its financial cost and reliability index;
(12) can recall slip ring system topology design scheme and the relevant information of calculated relevant wind energy turbine set engineering design;
(13) professional person can debug according to the actual conditions of case history some parameter of underlying algorithm, thereby improves the operation efficiency of this system.
Embodiment bis-
Below with a concrete application scenarios: in the application of osmanthus, Zhuhai mountain breeze electric field, technical scheme of the present invention and beneficial effect are done to further announcement:
The essential information of osmanthus mountain breeze electric field: osmanthus, Zhuhai mountain breeze electric field is a marine wind electric field of planning, mean depth is at 10m, apart from shore line 10km left and right, one has 66 Fans, every Fans installed capacity is 3MW, total installation of generating capacity is 198MW, and wherein marine wind electric field is provided with booster stations.
Specific operation process is described below:
One, transformer station's Data Enter, be user's input information, the information such as the wind field of input osmanthus, Zhuhai mountain breeze electric field, transformer station, blower fan and connection restriction: first, when carrying out transformer station's Data Enter, first must select its affiliated wind energy turbine set, then just can operate transformer station's information; Secondly, the basic operation of blower fan Data Enter is identical with transformer station, and the function that increases an importing can be set in addition in blower fan option, and user can be by blower fan information from other file import system database; Finally, about connecting restriction, user can select wind energy turbine set, spread out the map, line between irrealizable blower fan is set in wind energy turbine set on map, by clicking 2 of cannot directly be connected on map, one " forbidding connecting " can be set, user can also delete " forbidding connection " in addition;
Two, according to the requirement of Zhuhai Gui Shan slip ring system design, main element cable, switch and blower fan to slip ring system in component library option add;
Three, osmanthus, Zhuhai mountain breeze electric field is carried out to actual slip ring system engineering design.At engineering design option, relate generally to engineering management and calculating.Sub-option comprises engineering management, parameter setting, component library setting, initial connection, calculating progress, result demonstration and modification, engineering report etc.Wherein, parameter setting is to the correlation parameter of current activation engineering is set, comprise switch configuration parameter (configuration of traditional switch and switch configuration completely), reliability setting (consider fan trouble, do not consider fan trouble), calculating and setting (economy is preferential, reliability is preferential and consider) and coordinate system setting, here according to Zhuhai Gui Shan situation, arrange;
Four, input the essential information of osmanthus, Zhuhai mountain breeze electric field, model bank information etc., can start to calculate, obtain a series of topology diagrams that meet the demands, and operation result (economy cost, reliability cost or integrated cost) corresponding to each topology diagram also can show;
Five, according to user's demand, according to economy cost priority, reliability cost is preferential or integrated cost preferentially sorts to all topological structures, then exports the slip ring system topology diagram satisfying condition of some.Shown in Figure 2 for user's request be the topological connection diagram under integrated cost optimal conditions, it all can reach optimum in comprehensive economic index and reliability index, wherein economy aspect one-time investment cost has substantial degradation, aspect reliability, after optimizing, the equivalent fault rate of topology reduces, so a year fault opportunity cost reduces.So the topology of final optimization pass is optimum from its economy of Life cycle of marine wind electric field slip ring system, before not optimizing, cost does not reduce greatly.
Embodiment tri-
Corresponding with a kind of windward Electric field collector system topological method for designing in embodiment mono-, a kind of marine wind electric field slip ring system topology design device is provided in the present embodiment, as shown in Figure 3, comprising:
Initial topology structural generation module 101, for according to user's input information and various constraint condition, generates the topological structure that meets constraint condition;
Model is selected module 102, for each topological structure to generated, carries out trend calculating, draws the line electricity flow valuve on each topological structure, and selectes accordingly the cable of corresponding line, the model of switch;
Economy pricing module 103, for according to the cost of investment of selected cable, switch and maintenance cost, calculates the economy cost of each topological structure;
Reliability cost computing module 104, for according to selected cable, the fault rate of switch, calculates the reliability cost of each topological structure;
Sequence and output module 105, for according to described economy cost, reliability cost or consider that the integrated cost of economy cost and reliability cost sorts to each topological structure simultaneously, the topological structure of selection predetermined quantity is exported.
As a good embodiment, described initial topology structural generation module 101 can adopt the Optimum search algorithm based on graph theory minimum spanning tree to generate the topological structure that meets constraint condition.
As a good embodiment, described reliability cost computing module 104 can adopt following formula to calculate described reliability cost:
Wherein, p
ifor there is the probability that i kind fault occurs, q in topology
ithe performance number that topology is sent when breaking down i; λ is the rate for incorporation into the power network of wind energy turbine set; P
nrated power for every Fans; Q
nfor n Fans forms the equivalent outage rate of slip ring system topology; P
aIfor wind field total volume; C
costfor reliability cost.
As a good embodiment, described model selects module 102 can comprise line electricity flow valuve computing module, for adopting following formula to calculate described line electricity flow valuve:
Wherein, I
ibe the electric current on i bar limit, P
jfor the load of summit j, U
nfor slip ring system rated line voltage, β is the set of all nodes in downstream on i bar limit.
Other technical characterictic of a kind of marine wind electric field slip ring system topology design device of the present invention is identical with a kind of above-mentioned marine wind electric field slip ring system topology design method, does not repeat them here.
By above several embodiment, can find out, marine wind electric field slip ring system topology design method of the present invention and device, first list the topological structure satisfying condition as much as possible, then carry out trend and calculate selected cable and switch model, carry out again economy pricing and reliability cost and calculate, finally export topological structure some, that meet user's request.Method of the present invention and device have been realized Automated Design marine wind electric field slip ring system topological structure being carried out by computing machine, effectively replace traditional marine wind electric field slip ring system and adopted the mode of topology design of manually carrying out, thereby saved greatly the input of manpower, financial resources and time, and can adapt to the trend of marine wind electric field slip ring system topology quantity explosive increase.
The above embodiment has only expressed several embodiment of the present invention, and it describes comparatively concrete and detailed, but can not therefore be interpreted as the restriction to the scope of the claims of the present invention.It should be pointed out that for the person of ordinary skill of the art, without departing from the inventive concept of the premise, can also make some distortion and improvement, these all belong to protection scope of the present invention.Therefore, the protection domain of patent of the present invention should be as the criterion with claims.
Claims (8)
1. a marine wind electric field slip ring system topology design method, is characterized in that, comprises the following steps:
According to user's input information and various constraint condition, generate the topological structure that meets constraint condition;
Each generated topological structure is carried out to trend calculating, draw the line electricity flow valuve on each topological structure, and select accordingly the cable of corresponding line, the model of switch;
According to the cost of investment of selected cable, switch and maintenance cost, calculate the economy cost of each topological structure;
According to selected cable, the fault rate of switch, calculate the reliability cost of each topological structure;
According to described economy cost, reliability cost or consider that the integrated cost of economy cost and reliability cost sorts to each topological structure simultaneously, select the topological structure of predetermined quantity to export;
Adopt following formula to calculate described reliability cost:
Wherein, p
ifor there is the probability that i kind fault occurs, q in topology
ithe performance number that topology is sent when breaking down i; λ is the rate for incorporation into the power network of wind energy turbine set; P
nrated power for every Fans; Q
nfor n Fans forms the equivalent outage rate of slip ring system topology; P
aIfor wind field total volume; C
costfor reliability cost.
2. marine wind electric field slip ring system topology design method according to claim 1, it is characterized in that, the process that described generation meets the topological structure of constraint condition specifically comprises: adopt the Optimum search algorithm based on graph theory minimum spanning tree, generate the topological structure that meets constraint condition of default number.
3. marine wind electric field slip ring system topology design method according to claim 1, it is characterized in that, described user's input information comprises: the coordinate of offshore wind farm field information, blower fan and transformer station, cable library information, switch library information and wind-powered electricity generation unit information.
4. marine wind electric field slip ring system topology design method according to claim 3, is characterized in that, described constraint condition comprises: the constraint condition that the constraint condition of acquiescence, user arrange; Wherein:
The constraint condition of described acquiescence comprises: tree structure is divided total volume restriction and the restriction of slip ring system topology line intersection of number restriction, circuit;
The constraint condition that described user arranges comprises: forbid that connection, initialization connect.
5. marine wind electric field slip ring system topology design method according to claim 1, is characterized in that, adopts following formula to calculate described line electricity flow valuve:
Wherein, I
ibe the electric current on i bar limit, P
jfor the load of summit j, U
nfor slip ring system rated line voltage, β is the set of all nodes in downstream on i bar limit.
6. a marine wind electric field slip ring system topology design device, is characterized in that, comprising:
Initial topology structural generation module, for according to user's input information and various constraint condition, generates the topological structure that meets constraint condition;
Model is selected module, for each topological structure to generated, carries out trend calculating, draws the line electricity flow valuve on each topological structure, and selectes accordingly the cable of corresponding line, the model of switch;
Economy pricing module, for according to the cost of investment of selected cable, switch and maintenance cost, calculates the economy cost of each topological structure;
Reliability cost computing module, for according to selected cable, the fault rate of switch, calculates the reliability cost of each topological structure;
Sequence and output module, for according to described economy cost, reliability cost or consider that the integrated cost of economy cost and reliability cost sorts to each topological structure simultaneously, the topological structure of selection predetermined quantity is exported;
Described reliability cost computing module adopts following formula to calculate described reliability cost:
Wherein, p
ifor there is the probability that i kind fault occurs, q in topology
ithe performance number that topology is sent when breaking down i; λ is the rate for incorporation into the power network of wind energy turbine set; P
nrated power for every Fans; Q
nfor n Fans forms the equivalent outage rate of slip ring system topology; P
aIfor wind field total volume; C
costfor reliability cost.
7. marine wind electric field slip ring system topology design device according to claim 6, is characterized in that, described initial topology structural generation module adopts the Optimum search algorithm based on graph theory minimum spanning tree to generate the topological structure that meets constraint condition.
8. marine wind electric field slip ring system topology design device according to claim 6, is characterized in that, described model selects module to comprise line electricity flow valuve computing module, for adopting following formula to calculate described line electricity flow valuve:
Wherein, I
ibe the electric current on i bar limit, P
jfor the load of summit j, U
nfor slip ring system rated line voltage, β is the set of all nodes in downstream on i bar limit.
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