CN102427226B - 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 security and stability control measurement.
Background technology:
For guaranteeing the safe and stable operation of electric power system, except setting up rational electric network composition, arranging rational operational mode, also should supporting suitable security and stability control measurement.At many direct current power systems, (in the electric power system of this method middle finger, move many DC line, and the sending end of each DC line and receiving end current conversion station are respectively in same AC synchronous electrical network) in, when there is direct current locking fault, the security and stability control measurement of taking only at present be included in DC line sending end excision unit and (or) loaded by tip cut-off, be step (1) in this optimization method and the content in step (2), do not consider the optimization of security and stability control measurement.Its reason is mainly the DC line transmission power relatively little (actual maximum delivery power is all no more than 4000MW) moving at present, and domestic main electrical network is not all alternating current-direct current paired running (being that the sending end of DC line and receiving end be not in an AC synchronous electrical network), after direct current locking fault, surplus power can not transferred on communication channel in a large number, thus the machine of cutting of taking after direct current locking fault and cutting load amount 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 and put into operation the end of the year 2012, and specified transmission capacity reaches 7200MW.Brocade Su Zhiliu sending end is in Central China Power Grid, and receiving end is 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 again direct current, Central China Power Grid is sent totally 6 of the DC line of East China Power Grid.Central China, North China and East China Power Grid exchange after networking, form many direct current power systems (as shown in Figure 1) with the DC line that comprises bright and beautiful Su Zhiliu.When bright and beautiful Su Zhiliu occurs, after bipolar locking fault, to take the security and stability control measurement means of current unit shut algorithm by specified transmission capacity operation, need excise unit 7200MW in bright and beautiful Su Zhiliu sending end, be subject to tip cut-off load 5750MW.A large amount of excision units will produce significantly power flow changing in electrical network, increase the control difficulty of electrical network, interrupt operation and the generating of power plant; And a large amount of excision loads bring tremendous influence to social economy and people's lives especially.Therefore the security and stability control measurement of the present invention after to many direct current systems generation direct current locking fault is optimized.
Summary of the invention:
For the deficiencies in the prior art, the present invention proposes a kind of optimization method of many direct current systems security and stability control measurement, reduce to stablize control measure middle filling machine, cutting load amount, increase troubleshooting measure, strengthen electrical network backup protection means.The present invention is applicable to move the electric power system of many DC line.
The optimization method of a kind of many direct current power systems security and stability control measurement provided by the invention, its improvements are, described method comprises the steps:
(1) electrical network scale, electric network composition, operational mode, DC line power transmission direction, DC line transmission capacity and the DC line of determining target power system are sent receiving end situation;
(2) target power system is carried out to stability analysis, and during definite DC line generation locking fault, whether electrical network needs to take security and stability control measurement;
(3) according to the result of step (2), if desired take security and stability control measurement, the coordination of selecting direct current group to carry out bring to power is controlled;
(4) the direct current group's that determining step (3) is selected bring to power and lifting speed;
(5) according to step (4), the machine of cutting that need take while recalculating direct current locking fault and cutting load measure amount;
(6), according to the result of step (5), if standby control measure are taked in described direct current group's all or part of inefficacy of coordination control measure, calculating need to be appended unit and the load of excision;
(7), according to the result of step (5) and step (6), determine the embodiment of security and stability control measurement.
Preferably, the described electrical network scale of step (1) comprises network load total amount, generating set total amount and power supply feature;
Described electric network composition comprises Net Frame of Electric Network feature, interval interconnection is strong and weak and whether have electromagnetic looped network;
Described operational mode comprises that the circuit mode of connection, interval interconnection power direction/size, electrical network junction electric pressure, unit spinning reserve capacity, power plant's start-up mode, safety and stability control device drop into number and low-pressure reactive compensation equipment investment number;
Described DC line send receiving end situation to comprise the supporting power supply of DC line sending end and other unit output situations, receiving end near region trend situation and unit output situation.
Preferably, the described stability analysis of step (2) comprises angle stability, voltage stabilization, frequency stabilization and thermally-stabilised; Described security and stability control measurement comprises excision unit and load.
Preferably, step (3) direct current group's alternative condition comprises:
1) sending end/receiving end of selecting sending end/receiving end and fault DC line is respectively in same AC synchronous electrical network, DC line that power delivery direction is consistent;
2) select the DC line of sending end and/or receiving end current conversion station and fault DC electrical close together;
3) select the DC line that specified transmission capacity is large;
4) select current transmission capacity and the specified transmission capacity large DC line of nargin between the two.
Preferably, it is that sending end and receiving end in fault DC line arranges respectively master station that the described direct current group of step (3) coordinates to control, and described master station collects in real time power system operating mode, DC operation information, peace control and cuts machine and carry out the load condition that the start of power plant is exerted oneself and pacified control cutting load actuating station; After there is direct current locking fault, from the current conversion station of fault direct current, to master station, send fault-signal, master station is according to the security and stability control measurement of working out, and to each current conversion station transmitted signal of selected direct current group, each DC converter station is carried out power ascension according to the power adjustment strategy of prior setting; Master station is Xiang Ge power plant and transformer station's transmitted signal simultaneously, excises corresponding unit and load.
Preferably, the computing formula of the described DC line bring to power of step (4) is:
P
i=kP
n-P, wherein P
nfor the specified transmission power of DC line, k is overload factor, and P is the current transmission power of direct current.
Preferably, the machine of cutting that need take while recalculating direct current locking fault described in step (5) and cutting load measure amount are in take steps (4) measure of direct current group power ascension in the situation that, carry out stability analysis, recalculate and need the machine of cutting and the cutting load measure amount taked after DC Line Fault.Consider the reliability of direct current group power ascension function in actual electric network, can after direct current power enhanced feature loses efficacy, take standby control measure, append excision unit and load, guarantee system stability.
Preferably, the described standby control measure of step (6) comprise: after DC line bring to power lost efficacy, its current conversion station sends feedback signal to master station, and master station appends excision unit in the sending end of fault direct current after receiving signal, and receiving end is appended excision load.Because signal transmission needs the regular hour, the standby control measure of therefore appending excision unit and load relatively lag behind operate time.According to communications actual conditions, determine and append after the time of the machine of cutting and cutting load, the machine of cutting that calculating need to be appended and cutting load amount.
Preferably, the described embodiment of step (7) comprises: the selection of security and stability control measurement master station, the selection that machine is carried out power plant and peace control cutting load actuating station is cut in peace control.
Preferably, described power supply feature comprises the ratio of water power, thermoelectricity or wind-powered electricity generation.
Preferably, described Net Frame of Electric Network feature comprises long-chain formula, dual-ring network or day font looped network.
Compared with the prior art, beneficial effect of the present invention is:
The present invention can apply to the electric power system containing many DC line; by application and the enforcement of security and stability control measurement coordination optimizing method; can reduce security and stability control measurement middle filling machine, cutting load amount, increase troubleshooting measure, strengthen electrical network backup protection means.
Take this invention to carry out after coordination optimization the security and stability control measurement of many direct current power systems, can effectively utilize direct current variable capacity in system, system stability level after raising fault, reduce and cut the security and stability control measurement amounts such as machine, cutting load, thereby reduce the impact of DC Line Fault on power system operation, industrial production and people's lives.
Accompanying drawing explanation
Fig. 1 is Central China provided by the invention, North China, East China many direct current power systems rack schematic diagram;
Fig. 2 is the flow chart of the optimization method of many direct current systems security and stability control measurement provided by the invention;
Fig. 3 is the security and stability control measurement optimization method implementation method that is applied to bright and beautiful Su Zhiliu provided by the invention.
Embodiment
Below in conjunction with accompanying drawing, the specific embodiment of the present invention is described in further detail.
Fig. 2 is the flow chart of this implementation method, and concrete steps comprise:
Step (1): electrical network scale, structure, operational mode, direct current power transmission direction and transmission capacity, the direct current of determining many direct current power systems of research send receiving end situation.The electrical network of the present embodiment research comprises Central China, North China, three, East China large regional grid (being called for short three magnificent electrical networks), and three 500,000,000 kilowatts of magnificent electrical network total loads, always start 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 be take water power as main, and North China and East China Power Grid be take thermoelectricity as main.According to power network planning scheme, Central China～North China～East China Power Grid is interconnected by 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.Electrical network major network be take 500kV rack as main.Owing to being in the transitional period of extra-high voltage grid construction, a little less than large 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 Chongqing Sichuan send Hubei, and section power all arranges by limit transmission power.Each junction voltage all meets operation of power networks regulation.Direct current aspect, bright and beautiful Su Zhiliu adopts 1 time ± 800kV extra-high voltage direct-current transmission scheme from Central China Power Grid power transmission East China Power Grid, and DC engineering starting point is that Xichang Region, Sichuan Province, drop point are area, Wujiang, Jiangsu Province, DC engineering rated capacity 7200MW.Other DC line in power transmission East China, Central China comprise Ge Nan, imperial political affairs, should China, Lin Feng, give direct current again, the direct current You Gao ridge direct current in power transmission North China, northeast, the direct current in power transmission Central China, northwest has Lingbao City's direct current, the precious direct current of moral, the direct current in power transmission North China, northwest has silver-colored eastern direct current, and the direct current of Central China power transmission south electric network has city, river direct current.Each direct current is all by its specified transmission capacity Operation at full power.
Step (2): with reference to technical standards such as < < guiding rules of power system safety and stability > >, electric network fault is carried out to stability analysis.First check the single element fault of electrical network, do not take security and stability control measurement, must keep the normal power supply of power system stability operation and electrical network, if system unstability is adjusted the operational modes such as Section Tidal Current of Power Transmission, make fault after system keep stablizing.On the basis of above operational mode, check DC bipolar block fault, analyze the machine of cutting, cutting load security and stability control measurement for guaranteeing that system stability need be taked.The result of stability analysis shows, after brocade Soviet Union DC bipolar block fault, for guaranteeing system stability, need take to excise the Sichuan Hydropower unit of direct current sending end and the security and stability control measurement of receiving end East China load.
Step (3): the result based on step (2), can select direct current group to coordinate to control.Brocade Su Zhiliu is the DC engineering in power transmission East China, Central China, according to the principle of select to coordinate controlling direct current group, select Ge Nan, imperial political affairs, should China, Lin Feng, again give direct current totally 5 DC line groups carry out stable coordination control.
Step (4): can lifting capacity P according to direct current maximum
icomputing formula P
i=kP
n-P calculates can 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.Reliability and the capacity of equipment of considering security and stability control measurement, 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 again direct current is 20200MW, therefore total can bring to power ∑ Pi=2020MW.Consider DC equipment control system actual conditions, the parameter that direct current power promotes is as follows: after fault 0.3 second starts to promote direct current power, and the time of 0.3 second completes power ascension.
Step (5): according to the selected direct current group of step (3), definite direct current bring to power and the lifting speed of step (4), according to calculating principle and the method in step (2), recalculate stabilizing measures amount, result is as shown in table 1 below, has shown the benefit that application the present embodiment brings.As seen from table, if do not take " optimization way ", need excise in Sichuan Hydropower Unit 7200MW and at East China cutting load 5800MW, lose a large amount of units and load; If take " optimization way " to work out, coordinate control measure, only need excise in Sichuan Hydropower Unit 6600MW and at East China cutting load 3000MW, reduce and cut machine amount 600MW, reduce cutting load amount 2800MW.
Table 1 is optimized the brocade Soviet Union DC bipolar block failure safe of front and back and is stablized control measure
Step (6): according to the result of step (5), if Partial DC in the direct current group of described bring to power (imperial political affairs, suitable magnificent direct current) the altogether power ascension of 600MW lost efficacy, the current conversion station of direct current of losing efficacy sends feedback signal to master station, master station is received after signal, in the receiving end East China of bright and beautiful Su Zhiliu, append excision East China load 600MW, guarantee system stability.
Step (7): according to the result of step (5) and step (6), system implementation plan (direct current sending end) system of the control measure after the present embodiment is optimized is as Fig. 3, the enceinte of a city gate transformer station that bright and beautiful Su Zhiliu sending end current conversion station near region is set in scheme is master station, is responsible for collecting real-time grid operational mode (being mainly 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 and cuts machine and carry out the start of power plant (brocade one, brocade two, land owned by officials ,Er Tan, Pubugou Project power plant) and exert oneself.When bright and beautiful Su Zhiliu occurs, after direct current locking fault, to send fault-signal from the current conversion station of bright and beautiful Su Zhiliu to master station, master station is to selected direct current group current conversion station transmitted signal, and direct current group carries out power ascension according to the power adjustment strategy of prior setting; Master station is Xiang Ge power plant transmitted signal simultaneously, excises corresponding unit.After direct current group bring to power lost efficacy, the DC line of inefficacy is to master station feedback signal, and master station is cut machine to peace control and carried out power plant's transmitted signal, appends excision unit.
Embodiment and the sending end of direct current receiving end are similar, by master station is set, collect electric network information, receive fault message, to each peace control cutting load, carry out transformer station's transmitted signal, excision load.
The present embodiment is applied to the security and stability control measurement of brocade Soviet Union's DC bipolar block fault, is applicable to need to take after other locking faults the DC line of security and stability control measurement simultaneously.
Finally should be noted that: in conjunction with above-described embodiment, only illustrate that technical scheme of the present invention is not intended to limit.Those of ordinary skill in the field are to be understood that: those skilled in the art can modify or be equal to replacement the specific embodiment of the present invention, but among the claim protection range that these modifications or change are all awaited the reply in application.
Claims (9)
1. an optimization method for the security and stability control measurement of direct current power system more than, is characterized in that, described method comprises the steps:
(1) electrical network scale, electric network composition, operational mode, DC line power transmission direction, DC line transmission capacity and the DC line of determining target power system are sent receiving end situation;
(2) target power system is carried out to stability analysis, and during definite DC line generation locking fault, whether electrical network needs to take security and stability control measurement;
(3) according to the result of step (2), if desired take security and stability control measurement, the coordination of selecting direct current group to carry out bring to power is controlled;
(4) the direct current group's that determining step (3) is selected bring to power and lifting speed;
(5) according to step (4), the machine of cutting that need take while recalculating direct current locking fault and cutting load measure amount;
(6), according to the result of step (5), if described direct current group's coordination control measure lost efficacy, take standby control measure, excision unit and load that calculating need to be appended;
(7), according to the result of step (5) and step (6), determine the embodiment of security and stability control measurement;
Step (3) direct current group's alternative condition comprises:
1) sending end/receiving end of selecting sending end/receiving end and fault DC line is respectively in same AC synchronous electrical network, DC line that power delivery direction is consistent;
2) select the DC line of sending end and/or receiving end current conversion station and fault DC electrical close together;
3) select the DC line that specified transmission capacity is large;
4) select current transmission capacity and the specified transmission capacity large DC line of nargin between the two.
2. the method for claim 1, is characterized in that, the described electrical network scale of step (1) comprises network load total amount, generating set total amount and power supply feature;
Described electric network composition comprises Net Frame of Electric Network feature, interval interconnection is strong and weak and whether have electromagnetic looped network;
Described operational mode comprises that the circuit mode of connection, interval interconnection power direction/size, electrical network junction electric pressure, unit spinning reserve capacity, power plant's start-up mode, safety and stability control device drop into number and low-pressure reactive compensation equipment investment number;
Described DC line send receiving end situation to comprise the supporting power supply of DC line sending end and other unit output situations, receiving end near region trend situation and unit output situation.
3. the method for claim 1, is characterized in that, the described stability analysis of step (2) comprises angle stability, voltage stabilization, frequency stabilization and thermally-stabilised; Described security and stability control measurement comprises excision unit and load.
4. the method for claim 1, it is characterized in that, it is that sending end and receiving end in fault DC line arranges respectively master station that step (3) direct current group coordinates to control, and described master station collects in real time power system operating mode, DC operation information, peace control and cuts machine and carry out the load condition that the start of power plant is exerted oneself and pacified control cutting load actuating station; After there is direct current locking fault, from the current conversion station of fault direct current, to master station, send fault-signal, master station is according to the security and stability control measurement of working out, and to each current conversion station transmitted signal of selected direct current group, each DC converter station is carried out power ascension according to the power adjustment strategy of prior setting; Master station is Xiang Ge power plant and transformer station's transmitted signal simultaneously, excises corresponding unit and load.
5. the method for claim 1, is characterized in that, the computing formula of step (4) DC line bring to power is:
P
i=kP
n-P, wherein P
nfor the specified transmission power of DC line, k is overload factor, and P is the current transmission power of direct current.
6. the method for claim 1, it is characterized in that, the machine of cutting that need take while recalculating direct current locking fault described in step (5) and cutting load measure amount are in take steps (4) measure of direct current group power ascension in the situation that, carry out stability analysis, recalculate and need the machine of cutting and the cutting load measure amount taked after DC Line Fault, consider the reliability of direct current group power ascension function in actual electric network, after losing efficacy, direct current power enhanced feature taked standby control measure, append excision unit and load, guarantee system stability.
7. the method for claim 1, is characterized in that, the described standby control measure of step (6) comprise: the DC line that bring to power lost efficacy is sent feedback signal, and master station excises unit in the sending end of fault direct current after receiving signal, loaded by tip cut-off.
8. method as claimed in claim 2, is characterized in that, described power supply feature comprises the ratio of water power, thermoelectricity or wind-powered electricity generation.
9. method as claimed in claim 2, is characterized in that, described Net Frame of Electric Network feature comprises long-chain formula, dual-ring network or day font looped network.
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