CN102427226A - Optimization method for safety and stability control measure of multi-direct-current power system - Google Patents
Optimization method for safety and stability control measure of multi-direct-current power system Download PDFInfo
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Abstract
The invention discloses an optimization method for safety and stability control measures of a multi-direct-current power system. The optimization method comprises the steps of determining the grid scale, operation method, direct-current supply power and transmitting and receiving end situations of a target power system; conducting stability analysis to the target power system, and determining whether the safety and stability control measures are required to be taken to the grid or not after a direct-current line is determined to be faulted; if so, selecting a direct-current group for coordination control; determining the promoting power and promoting speed of the direct-current group; recalculating the generation shedding and shedding load of a direct-current fault, wherein standby control measures can be additionally taken to the generation shedding and shedding load after direct-current power is failed to be promoted; and determining the implementation scheme of the safety and stability control measures. After the safety and stability control measures of the multi-direct-current power system are coordinately optimized by adopting the optimization method, the direct-current adjustable capacity of the system can be effectively utilized, the stability of the system after the fault occurs is improved, the number of the safety and stability control measures for generation shedding, shedding load and the like is reduced, and the impacts caused by the direct-current fault to power operation, industrial production and the living of people are reduced.
Description
Technical field:
The present invention relates to field of power, be specifically related to a kind of optimization method of many direct current power systems safety and stability control measure.
Background technology:
For guaranteeing the safe and stable operation of electric power system, except setting up rational electric network composition, arranging the reasonable Operation Mode, also should supporting suitable safety and stability control measure.At many direct current power systems (many DC lines of operation in the electric power system of this method middle finger; And each DC line send the end and held current conversion station to be in respectively in the same ac synchronous electrical network) in; When direct current locking fault takes place when; The safety and stability control measure of taking at present only be included in DC line send the tip cut-off unit with (or) loaded by tip cut-off, promptly the content in step in this optimization method (1) and the step (2) is not considered the optimization of safety and stability control measure.Its reason mainly is the DC line transmission power less relatively (actual maximum delivery power all is no more than 4000MW) that moves at present; And domestic main electrical network all is not alternating current-direct current paired running (being sending end and receiving end not in an ac synchronous electrical network of DC line); Surplus power can not transferred on the communication channel in a large number after the direct current locking fault, so the cutter of taking after the direct current locking fault and cutting load amount are less.
Silk screen～southern Jiangsu ± 800kV extra-high voltage direct-current engineering (hereinafter to be referred as bright and beautiful Su Zhiliu) is estimated to build up the end of the year 2012 and is put into operation, and specified transmission capacity reaches 7200MW.Brocade Su Zhiliu send end to be in Central China Power Grid, receives end to be in East China Power Grid, add original Ge Nan direct current, imperial political affairs direct current, should magnificent direct current, woods maple direct current and give direct current again, Central China Power Grid is sent totally 6 of the DC lines of East China Power Grid.Central China, North China and East China Power Grid constitute many direct current power systems (as shown in Figure 1) with the DC line that comprises bright and beautiful Su Zhiliu after exchanging networking.After the bipolar locking fault takes place by specified transmission capacity operation in bright and beautiful Su Zhiliu, take the safety and stability control measure means of present cutter cutting load, need to send tip cut-off unit 7200MW, receive tip cut-off load 5750MW at bright and beautiful Su Zhiliu.The mass excision unit will produce significantly trend variation in electrical network, increase the control difficulty of electrical network, interrupt the operation and the generating of power plant; And the mass excision load brings tremendous influence to social economy and people's lives especially.Therefore the safety and stability control measure of the present invention after to many direct current systems generation direct current locking fault are optimized.
Summary of the invention:
To the deficiency of prior art, the present invention proposes a kind of optimization method of many direct current systems safety and stability control measure, reduce to stablize control measure middle filling machine, cutting load amount, increase the troubleshooting measure, strengthen electrical network backup protection means.The present invention is applicable to the electric power system of many DC lines of operation.
The optimization method of a kind of many direct current power systems safety and stability control measure provided by the invention, its improvements are that said method comprises the steps:
(1) scale of power, electric network composition, operational mode, the DC line of confirming target power system send electric direction, DC line transmission capacity and DC line to send the end situation that receives;
(2) target power system is carried out stability analysis, and during definite DC line generation locking fault, whether electrical network need take the safety and stability control measure;
(3) according to the result of step (2),, then select the direct current crowd to carry out the coordination control of bring to power if need take the safety and stability control measure;
(4) bring to power of confirming the direct current crowd that step (3) is selected with promote speed;
(5) according to step (4), the cutter that need take when recomputating direct current locking fault and cutting load measure amount;
(6) according to the result of step (5), if the reserve control measure are then taked in said direct current crowd's all or part of inefficacy of coordination control measure, calculating need be appended the unit and the load of excision;
(7), confirm the embodiment of safety and stability control measure according to the result of step (5) and step (6).
Preferably, the said scale of power of step (1) comprises network load total amount, generating set total amount and power supply characteristics;
Said electric network composition comprises electrical network rack characteristics, interval interconnection is strong and weak and whether have electromagnetic looped network;
Said operational mode comprises the circuit mode of connection, interval interconnection power direction/size, electrical network junction electric pressure, unit spinning reserve capacity, power plant's start mode, safety and stability control device drops into number and low-pressure reactive compensation equipment drops into number;
Said DC line send and receives the end situation to comprise that DC line send the supporting power supply of end and other unit output situation, held near region trend situation and unit output situation.
Preferably, the said stability analysis of step (2) comprises angle stability, stable, the frequency stabilization and thermally-stabilised of voltage; Said safety and stability control measure comprise excision unit and load.
Preferably, step (3) direct current crowd's alternative condition comprises:
1) selects to send to hold/held to hold/held and be in same ac synchronous electrical network, DC line that the power delivery direction is consistent respectively with sending of fault DC line;
2) selection is sent end and/or is held the DC line of current conversion station and fault DC electrical close together;
3) select the big DC line of specified transmission capacity;
4) select current transmission capacity and the specified transmission capacity big DC line of nargin between the two.
Preferably; It is the sending end and receive end that master station is set respectively of fault DC line that the said direct current crowd of step (3) coordinates to control, and said master station compiles power system operating mode, DC operation information, peace control cutter in real time and carries out the load condition that the start of power plant is exerted oneself and pacified control cutting load actuating station; When direct current locking fault takes place after; Send fault-signal from the current conversion station of fault direct current to master station; Master station sends signal according to the safety and stability control measure of working out to each current conversion station of selected direct current crowd, and each DC converter station carries out power ascension according to the power adjustment strategy of prior setting; Master station sends signal to each power plant and transformer station simultaneously, excises corresponding unit and load.
Preferably, the computing formula of the said DC line bring to power of step (4) is:
P
i=kP
n-P, wherein P
nBe the specified transmission power of DC line, k is an overload factor, and P is the current transmission power of direct current.
Preferably; Cutter and cutting load measure amount that step (5) is said need be taked when recomputating direct current locking fault are under the situation of direct current crowd power ascension measure in take steps (4); Carry out stability analysis, recomputate cutter and the cutting load measure amount that to take after the direct current fault.Consider the reliability of direct current crowd power ascension function in the actual electric network, can after the direct current power enhanced feature loses efficacy, take the reserve control measure, append excision unit and load, guarantee system stability.
Preferably, the said reserve control measure of step (6) comprise: after the DC line bring to power lost efficacy, its current conversion station sent feedback signal to master station, and master station receives that the end that send at the fault direct current appends the excision unit behind the signal, receives end to append the excision load.Because the signal transmission needs the regular hour, the reserve control measure of therefore appending excision unit and load relatively lag behind operate time.After confirming to append the time of cutter and cutting load according to the communications actual conditions, cutter that calculating need be appended and cutting load amount.
Preferably, the said embodiment of step (7) comprises: the selection of power plant and peace control cutting load actuating station is carried out in the selection of safety and stability control measure master station, peace control cutter.
Preferably, said power supply characteristics comprise the ratio of water power, thermoelectricity or wind-powered electricity generation.
Preferably, said electrical network rack characteristics comprise long-chain formula, dual-ring network or day font looped network.
With the prior art ratio, beneficial effect of the present invention is:
The present invention can apply to contain the electric power system of many DC lines; Application and enforcement through safety and stability control measure coordination optimizing method; Can reduce safety and stability control measure middle filling machine, cutting load amount, increase the troubleshooting measure, strengthen electrical network backup protection means.
After taking this invention that the safety and stability control measure of many direct current power systems are carried out coordination optimization; Can effectively utilize direct current variable capacity in the system; System stability level after the raising fault; Reduce safety and stability control measure amounts such as cutter, cutting load, thereby reduce of the influence of direct current fault power system operation, commercial production and people's lives.
Description of drawings
Fig. 1 is Central China provided by the invention, North China, East China many direct current power systems rack sketch map;
Fig. 2 is the flow chart of the optimization method of many direct current systems safety and stability control measure provided by the invention;
Fig. 3 is the safety and stability control measure optimization method implementation method that is applied to bright and beautiful Su Zhiliu provided by the invention.
Embodiment
Do further to specify below in conjunction with the accompanying drawing specific embodiments of the invention.
Fig. 2 is the flow chart of this implementation method, and concrete steps comprise:
Step (1): scale of power, structure, operational mode, the direct current of confirming many direct current power systems of research send electric direction and transmission capacity, direct current to send the end situation that receives.The electrical network of present embodiment research comprises Central China, North China, three large regional grids in East China (being called for short three magnificent electrical networks), and 500,000,000 kilowatts of three magnificent electrical network total loads are always started shooting 5.1 hundred million kilowatts, 1,000 ten thousand kilowatts of unit spinning reserve capacities.Central China Power Grid especially Sichuan Electric Power Network is main with water power, and North China and East China Power Grid are main with thermoelectricity.According to the Electric Power Network Planning scheme, Central China～North China～East China Power Grid is interconnected through 1000kV AC extra high voltage interconnection, and the semi-loop 1000kV AC extra high voltage electrical network of Huainan～Wan Nan～Zhe Bei～Hu Xi is built up in East China Power Grid inside, and whole three magnificent electrical networks are inverted U.The electrical network major network is main with the 500kV rack.Owing to be in the transitional period that extra-high voltage grid is built, a little less than the big interval 1000kV AC extra high voltage interconnection relative thin.Important transmission cross-section direction is that Central China send North China, North China to send East China, and Hubei is sent in Chongqing, Sichuan, and section power is all arranged by limit transmission power.Each junction voltage all meets the operation of power networks regulation.The direct current aspect, bright and beautiful Su Zhiliu adopts 1 time ± 800kV extra-high voltage direct-current transmission scheme to send electric East China Power Grid from Central China Power Grid, and the DC engineering starting point is that area, Xichang, Sichuan Province, drop point are area, Wujiang, Jiangsu Province, DC engineering rated capacity 7200MW.Central China send other DC lines in electric East China comprise Ge Nan, imperial political affairs, should China, Lin Feng, give direct current again; Northeast send the direct current in electric North China that high mountain range direct current is arranged; The northwest send the direct current in electric Central China that Lingbao City's direct current, the precious direct current of moral are arranged; The northwest send the direct current in electric North China that silver-colored eastern direct current is arranged, and Central China send the direct current of electric south electric network that city, river direct current is arranged.Each direct current is all by its specified transmission capacity full power operation.
Step (2):, electric network fault is carried out stability analysis with reference to technical standards such as " power system safety and stability guide rules ".At first check the single element fault of electrical network, do not take the safety and stability control measure, must keep the normal power supply of power system stability operation and electrical network,, make that system keeps stablizing after the fault if system's unstability is then adjusted operational modes such as transmission cross-section trend.On the basis of above operational mode, check DC bipolar locking fault, analyze cutter, cutting load safety and stability control measure for guaranteeing that system stability need be taked.The result of stability analysis shows, after the brocade Soviet Union DC bipolar locking fault, for guaranteeing system stability, need take to excise the safety and stability control measure that direct current send the Sichuan Hydropower unit of end and held the East China load.
Step (3):, can select the direct current crowd to coordinate control based on the result of step (2).Brocade Su Zhiliu is the DC engineering that electric East China is sent in Central China, according to principle that select to coordinate control direct current crowd, select Ge Nan, imperial political affairs, suitable China, Lin Feng, again give direct current totally 5 DC line crowds carry out stable coordination and control.
Step (4): but according to direct current maximum lifting capacity P
iComputing formula P
i=kP
nBut-P calculates lifting capacity.Wherein, in this routine power system operating mode, the actual fed power of each direct current has all reached its specified transmission capacity, i.e. P=Pn.Consider the reliability and the capacity of equipment of safety and stability control measure, overload factor k gets 11, and formula becomes P
i=0.1P
n, Ge Nan, imperial political affairs, should China, Lin Feng, the gross rated capacity of giving direct current again be 20200MW, but therefore total bring to power ∑ Pi=2020MW.Consider DC equipment control system actual conditions, the parameter that direct current power promotes is following: 0.3 second begins to promote direct current power after the fault, and 0.3 second time is accomplished power ascension.
Step (5): according to the selected direct current crowd of step (3), the definite direct current bring to power and lifting speed of step (4); According to calculating principle and the method in the step (2); Recomputate the stabilizing measures amount, the result is as shown in table 1 below, has shown to use the benefit that present embodiment brings.Can know by table, if do not take " optimization way ", need in Sichuan excision Hydropower Unit 7200MW and in East China cutting load 5800MW, lost a large amount of units and load; If take " optimization way " work out to coordinate control measure, only need in Sichuan excision Hydropower Unit 6600MW and in East China cutting load 3000MW, reduce cutter amount 600MW, reduce cutting load amount 2800MW.
Brocade Soviet Union DC bipolar locking failure safe before and after table 1 is optimized is stablized control measure
Step (6): according to the result of step (5); If part direct current among the direct current crowd of said bring to power (imperial political affairs, the suitable magnificent direct current) power ascension of 600MW altogether lost efficacy; The current conversion station of direct current of then losing efficacy sends feedback signal to master station; After master station is received signal, append excision East China load 600MW, guarantee system stability in the East China of being held of bright and beautiful Su Zhiliu.
Step (7): according to the result of step (5) and step (6); System implementation plan (direct current send end) system such as Fig. 3 of control measure after present embodiment is optimized; Bright and beautiful Su Zhiliu is set in the scheme, and to send the enceinte of a city gate transformer station of end current conversion station near region be master station, is responsible for compiling real-time grid operational mode (mainly being ultra high voltage interconnection power between North China, Central China, East China, North China), DC operation information (the direct current transmission power in East China is sent in Central China), peace control cutter and carries out the start of power plant (brocade one, brocade two, land owned by officials, two beaches, waterfall ditch power plant) and exert oneself.After direct current locking fault takes place in bright and beautiful Su Zhiliu, send fault-signal from the current conversion station of bright and beautiful Su Zhiliu to master station, master station sends signal to selected direct current crowd current conversion station, and the direct current crowd carries out power ascension according to the power adjustment strategy of prior setting; Master station sends signal to each power plant simultaneously, excises corresponding unit.After direct current crowd bring to power lost efficacy, the DC line of inefficacy was to the master station feedback signal, and master station is carried out power plant to peace control cutter and sent signal, appends the excision unit.
The embodiment that direct current is held with send end similar, compile electric network information through master station is set, receive fault message, carry out transformer station to each peace control cutting load and send signal, the excision load.
Present embodiment is applied to the safety and stability control measure of brocade Soviet Union's DC bipolar locking fault, is applicable to the DC line that need take the safety and stability control measure after other locking faults simultaneously.
Should be noted that at last: combine the foregoing description technical scheme of the present invention only to be described but not its restriction.Under the those of ordinary skill in field be to be understood that: those skilled in the art can specific embodiments of the invention make amendment or are equal to replacement, but these modifications or change are all among the claim protection range that application is awaited the reply.
Claims (10)
1. the optimization method of the control measure of direct current power system safety and stability more than a kind is characterized in that said method comprises the steps:
(1) scale of power, electric network composition, operational mode, the DC line of confirming target power system send electric direction, DC line transmission capacity and DC line to send the end situation that receives;
(2) target power system is carried out stability analysis, and during definite DC line generation locking fault, whether electrical network need take the safety and stability control measure;
(3) according to the result of step (2),, then select the direct current crowd to carry out the coordination control of bring to power if need take the safety and stability control measure;
(4) bring to power of confirming the direct current crowd that step (3) is selected with promote speed;
(5) according to step (4), the cutter that need take when recomputating direct current locking fault and cutting load measure amount;
(6) according to the result of step (5),, then take the reserve control measure, excision unit and load that calculating need be appended if said direct current crowd's coordination control measure lost efficacy;
(7), confirm the embodiment of safety and stability control measure according to the result of step (5) and step (6).
2. the method for claim 1 is characterized in that, the said scale of power of step (1) comprises network load total amount, generating set total amount and power supply characteristics;
Said electric network composition comprises electrical network rack characteristics, interval interconnection is strong and weak and whether have electromagnetic looped network;
Said operational mode comprises the circuit mode of connection, interval interconnection power direction/size, electrical network junction electric pressure, unit spinning reserve capacity, power plant's start mode, safety and stability control device drops into number and low-pressure reactive compensation equipment drops into number;
Said DC line send and receives the end situation to comprise that DC line send the supporting power supply of end and other unit output situation, held near region trend situation and unit output situation.
3. the method for claim 1 is characterized in that, the said stability analysis of step (2) comprises angle stability, stable, the frequency stabilization and thermally-stabilised of voltage; Said safety and stability control measure comprise excision unit and load.
4. the method for claim 1 is characterized in that, step (3) direct current crowd's alternative condition comprises:
1) selects to send to hold/held to hold/held and be in same ac synchronous electrical network, DC line that the power delivery direction is consistent respectively with sending of fault DC line;
2) selection is sent end and/or is held the DC line of current conversion station and fault DC electrical close together;
3) select the big DC line of specified transmission capacity;
4) select current transmission capacity and the specified transmission capacity big DC line of nargin between the two.
5. the method for claim 1; It is characterized in that; It is the sending end and receive end that master station is set respectively of fault DC line that the said direct current crowd of step (3) coordinates to control, and said master station compiles power system operating mode, DC operation information, peace control cutter in real time and carries out the load condition that the start of power plant is exerted oneself and pacified control cutting load actuating station; When direct current locking fault takes place after; Send fault-signal from the current conversion station of fault direct current to master station; Master station sends signal according to the safety and stability control measure of working out to each current conversion station of selected direct current crowd, and each DC converter station carries out power ascension according to the power adjustment strategy of prior setting; Master station sends signal to each power plant and transformer station simultaneously, excises corresponding unit and load.
6. the method for claim 1 is characterized in that, the computing formula of the said DC line bring to power of step (4) is:
P
i=kP
n-P, wherein P
nBe the specified transmission power of DC line, k is an overload factor, and P is the current transmission power of direct current.
7. the method for claim 1; It is characterized in that; Cutter and cutting load measure amount that step (5) is said need be taked when recomputating direct current locking fault are under the situation of direct current crowd power ascension measure in take steps (4); Carry out stability analysis, recomputate cutter and the cutting load measure amount that to take after the direct current fault.Consider the reliability of direct current crowd power ascension function in the actual electric network, can after the direct current power enhanced feature loses efficacy, take the reserve control measure, append excision unit and load, guarantee system stability.
8. the method for claim 1 is characterized in that, the said reserve control measure of step (6) comprise: the DC line that bring to power lost efficacy sends feedback signal, master station receive behind the signal the fault direct current send the tip cut-off unit, loaded by tip cut-off.
9. method as claimed in claim 2 is characterized in that said power supply characteristics comprise the ratio of water power, thermoelectricity or wind-powered electricity generation.
10. method as claimed in claim 2 is characterized in that, said electrical network rack characteristics comprise long-chain formula, dual-ring network or day font looped network.
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