CN103400026A - Method for computing effective capacity coefficient of large wind power base and method for determining capacity of power transmission channel of large wind power base - Google Patents
Method for computing effective capacity coefficient of large wind power base and method for determining capacity of power transmission channel of large wind power base Download PDFInfo
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Abstract
The invention relates to a method for computing an effective capacity coefficient of a large wind power base and a method for determining the capacity of a power transmission channel of the large wind power base. According to the method for computing the effective capacity coefficient of the large wind power base and the method for determining the capacity of the power transmission channel of the large wind power base, cost for receiving wind power is composed of three parts according to the wind power consumption process of a system, the three parts are wind power cost, power grid cost and peak shaving cost, the wind power cost comprises construction investment of wind power installation and operation and maintenance cost, the power grid cost comprises construction investment for delivering wind power out of a power grid, operation and maintenance cost and transmission loss cost, and the peak shaving cost comprises construction investment of a peaking power source, operation and maintenance cost and peak shaving loss cost; after the installed capacity of the wind power base is determined, the variation tendency of the wind power cost is contrary to the variation tendency of the power grid cost and the variation tendency of the peak shaving cost in the cost of per unit wind power along with the change of a selected capacity coefficient, the total cost which is the sum of the wind power cost, the power grid cost and the peak shaving cost of per unit wind power can reach a lowest point, the power transmission channel is established and a peaking power source is equipped according to a wind power capacity coefficient corresponding to the lowest point, the optimal economical point of wind power consumption of the whole system is achieved, and the wind power capacity coefficient corresponding to the lowest point is the power wind effective capacity coefficient.
Description
[technical field]
The present invention relates to technical field of wind power generation, particularly the computing method of a kind of large-scale wind electricity base useful capacity coefficient.
[background technology]
Due to randomness and the uncertainty of wind-powered electricity generation, output of wind electric field is certain probability distribution, and the probability that surpasses certain given value of exerting oneself may be very little, to exerting oneself above electric weight also seldom.For the large-scale wind electricity base, this feature is especially obvious.The statistical study that wind-powered electricity generation base, northwest history is gone out force data shows, this wind-powered electricity generation base maximum output is that 0.724(accounts for the installed capacity of wind-driven power ratio), exerting oneself surpasses 0.53 probability and only has 5%, but the electric weight that surpasses 0.53 or more of exerting oneself only accounts for 1.21% of whole generated energy.Due to the many places, large-scale wind electricity base of China planning in remote districts,, away from load center, need to send at a distance on a large scale, if according to its quantity of electricity of admittance in full, build passway for transmitting electricity and be equipped with peaking power source, uneconomic beyond doubt, also be unfavorable for the large-scale development of wind-powered electricity generation.Account for the ratio of whole generated energy for improving as far as possible the wind-powered electricity generation generated energy, and take into account the economy of Wind Power Development, China's energy industry standard " Large Scale Wind Farm Integration be incorporated into the power networks designing technique standard " has been introduced the concept of wind-powered electricity generation useful capacity in (NB/T-31003-2011), specific definition is: according to the probability distribution of exerting oneself of wind-powered electricity generation, consider peak-load regulating and send engineering, make system reach the wind-powered electricity generation maximum output of Technological Economy optimum, be the wind-powered electricity generation useful capacity.The ratio of wind-powered electricity generation useful capacity and its installed capacity is referred to as " wind-powered electricity generation useful capacity coefficient ".
This shows, determine that the size of wind-powered electricity generation useful capacity (or wind-powered electricity generation useful capacity coefficient) is very important for the exploitation of large-scale wind electricity base., about the concrete problems of value of wind-powered electricity generation useful capacity, be recommended in temporarily in " Large Scale Wind Farm Integration be incorporated into the power networks designing technique standard " in 95%～99% probable range and select, and need carry out obtaining after concrete Technological Economy while proposing the engineering application.But do not mention Technological Economy concrete grammar relatively in standard, this causes the frequent situation that effective capacity coefficient occurs determining with subjective experience in engineering practice, lacks certain science.
[summary of the invention]
The object of the present invention is to provide computing method and the passway for transmitting electricity thereof of a kind of large-scale wind electricity base useful capacity coefficient to hold method for determination of amount.
To achieve these goals, the present invention adopts following technical scheme:
The computing method of a kind of large-scale wind electricity base useful capacity coefficient comprise the following steps:
Step 1: determine wind-powered electricity generation base installed capacity of wind-driven power Z, choose the capacity coefficient k of wind-powered electricity generation;
Step 2: the wind-powered electricity generation annual cost of calculating wind-powered electricity generation annual cost and unit quantity of electricity according to installed capacity of wind-driven power;
Step 3:, according to the wind-powered electricity generation capacity coefficient of choosing, determine wind-powered electricity generation passway for transmitting electricity construction scale and Transmission Loss, calculate the electrical network annual cost of electrical network annual cost and unit quantity of electricity;
Step 4:, according to the wind-powered electricity generation capacity coefficient of choosing, determine the peak that system need to provide, according to production simulation, determine peaking power source arrangement and peak regulation loss, calculate the peak regulation annual cost of peak regulation annual cost and unit quantity of electricity;
Step 5: total annual cost of unit of account wind-powered electricity generation electric weight;
Step 6: choose new wind-powered electricity generation capacity coefficient, repeating step 2 to 5, until the minimum point of the total annual cost of the unit of finding out, the capacity coefficient that this point is corresponding is the useful capacity coefficient.
The present invention further improves and is: step 6 is in iterative process, and the change step of k value equals the wind-powered electricity generation base and sends the precision of engineering design.
The present invention further improves and is: step 2 specifically comprises:, according to the wind-powered electricity generation electric weight family curve of exerting oneself-accumulate, find out obtainable wind-powered electricity generation electricity volume under this capacity coefficient, calculate the wind-powered electricity generation annual cost while obtaining unit wind-powered electricity generation electric weight;
Concrete calculating formula is as follows:
Fj=Ft×Zf （1）
Fw=Ft×Kfw （2）
F=Fj+Fw （3）
Df=F÷L （4）
Wherein, F is the wind-powered electricity generation annual cost; Fj is that annual cost is built in the wind-powered electricity generation installation; Fw is wind-powered electricity generation operation maintenance annual cost; Ft is wind-powered electricity generation installation total investment for construction; Zf is the recovery of the capital coefficient; Kfw is the ratio (wind-powered electricity generation operation maintenance annual fee rate) that wind-powered electricity generation operation maintenance annual cost accounts for wind-powered electricity generation installation total investment for construction; L is wind-powered electricity generation year electricity volume; Df is the wind-powered electricity generation annual cost of unit quantity of electricity.
The present invention further improves and is: in step 3, concrete calculating formula is as follows:
Wj=Wt×Zw （5）
Wt=Wht+Wst （6）
Ww=Wt×Kww （7）
Ws=Ls×Df （8）
Ls=L×Kws （9）
W=Wj+Ww+Ws （10）
Dw=W÷（L-Ls） （11）
Wherein, W is the electrical network annual cost; Wj is the power grid construction annual cost; Ww is that annual cost is safeguarded in operation of power networks; Ws is the network loss annual cost; Wt is for to send supporting power grid construction gross investment with wind-powered electricity generation; Zw is the recovery of the capital coefficient; Wht is that wind-powered electricity generation collects the system Construction investment; Wst is the construction investment of wind-powered electricity generation transmission system; Kww is that operation of power networks safeguards that annual cost accounts for the ratio of power grid construction gross investment; Ls is Energy loss; L is wind-powered electricity generation year electricity volume; Kws is Network Loss Rate; Dw is the electrical network annual cost of unit quantity of electricity.
The present invention further improves and is: in step 4, concrete calculating formula is as follows:
Tj=Tt×Zt （12）
Tw=Tt×Ktw （13）
Ts=Lt×（Df+Dw） （14）
T=Tj+Tw+Ts （15）
Dt=T÷（L-Ls-Lt） （16）
Wherein, T is the peak regulation annual cost; Tj is that peaking power source is built annual cost; Tw is peaking power source operation maintenance annual cost; Ts is peak regulation loss annual cost; Tt is the peaking power source total investment for construction; Zt is the recovery of the capital coefficient; Ktw is the ratio that peaking power source operation maintenance annual cost accounts for the peaking power source total investment for construction; Lt is the peak regulation loss of electricity; Dt is the peak regulation annual cost of unit quantity of electricity.
The present invention further improves and is: in step 5, the total annual cost of unit quantity of electricity equals the wind-powered electricity generation annual cost of unit quantity of electricity, the electrical network annual cost of unit quantity of electricity and the peak regulation annual cost sum of unit quantity of electricity.
A kind of large-scale wind electricity base passway for transmitting electricity holds method for determination of amount, adopts the useful capacity coefficient to carry out the planning of passway for transmitting electricity, and the capacity of passway for transmitting electricity equals this large-scale wind electricity base installed capacity of wind-driven power and the useful capacity coefficient is long-pending.
The present invention is according to the dissolve process of wind-powered electricity generation of system, and the expense when admitting the wind-powered electricity generation electric weight is divided into three parts:
The one, the wind-powered electricity generation expense mainly comprises: construction investment, the operation maintenance expense of wind-powered electricity generation installation.
For the installed capacity of wind-driven power of determining, the construction investment of wind-powered electricity generation, operation maintenance expense are a determined value basically.When the wind-powered electricity generation electric weight of admitting when system was more, this part expense of sharing on unit quantity of electricity was fewer, and therefore, the wind-powered electricity generation expense of unit quantity of electricity is along with the raising of the ratio value of admitting wind-powered electricity generation presents dull downtrending.
The 2nd, the electrical network expense mainly comprises: wind-powered electricity generation is sent construction investment, operation maintenance expense, the cost of losses of electrical network.
Exerting oneself and accumulating between electric weight the rule that presents " pyramid " formula due to wind-powered electricity generation, while admitting the ratio value raising of wind-powered electricity generation, increasing identical transmission capacity, can to increase the wind-powered electricity generation electric weight of conveying fewer, the electrical network expense of sharing on unit quantity of electricity is more, therefore, the electrical network expense of unit quantity of electricity is along with the raising of the ratio value of admitting wind-powered electricity generation presents monotone increasing trend.
The 3rd, the peak regulation expense mainly comprises: peaking power source construction investment, operation maintenance expense, peak regulation wear and tear expense.
Same exerting oneself and accumulating between electric weight the rule that presents " pyramid " formula due to wind-powered electricity generation, while admitting the ratio value raising of wind-powered electricity generation, increasing identical peak, can to increase the wind-powered electricity generation electric weight of adjusting fewer, the peak regulation expense of sharing on unit quantity of electricity is more, therefore, the peak regulation expense of unit quantity of electricity is along with the raising of the ratio value of admitting wind-powered electricity generation presents monotone increasing trend.
As the above analysis, in the expense of unit wind-powered electricity generation electric weight, the wind-powered electricity generation expense is opposite with the trend of electrical network, peak regulation expense, and the master curve after 3 curve combinings there will be minimum point, and unit wind-powered electricity generation electric weight total expenses that this point is corresponding is minimum.Specifically see the curve 4 in Fig. 1.Send passage and be equipped with peaking power source according to wind-powered electricity generation capacity coefficient construction corresponding to this point, can reach the dissolve optimal economic point of wind-powered electricity generation of total system, the wind-powered electricity generation capacity coefficient of this point correspondence is wind-powered electricity generation useful capacity coefficient.
The calculation procedure of this method is as follows:
Step 1: determine installed capacity of wind-driven power, choose the capacity coefficient of wind-powered electricity generation.
Step 2: according to installed capacity of wind-driven power, calculate the wind-powered electricity generation annual cost; According to the wind-powered electricity generation electric weight family curve of exerting oneself-accumulate, find out obtainable wind-powered electricity generation electricity volume under this capacity coefficient, calculate the wind-powered electricity generation annual cost while obtaining unit wind-powered electricity generation electric weight.
Step 3:, according to the wind-powered electricity generation capacity coefficient of choosing, determine wind-powered electricity generation passway for transmitting electricity construction scale and Transmission Loss, calculate electrical network annual cost and unit electrical network annual cost.
Step 4:, according to the wind-powered electricity generation capacity coefficient of choosing, determine the peak that system need to provide, according to production simulation, determine peaking power source arrangement and peak regulation loss, calculate peak regulation annual cost and unit peak regulation annual cost.
Step 5: total annual cost of unit of account wind-powered electricity generation electric weight.
Step 6: choose new wind-powered electricity generation capacity coefficient, repeating step 2 to 5, until the minimum point of the total annual cost of the unit of finding out, the capacity coefficient that this point is corresponding is the useful capacity coefficient.
The circular of the wind-powered electricity generation annual cost of unit quantity of electricity, electrical network annual cost, peak regulation annual cost is:
1, the calculating of wind-powered electricity generation annual cost
Wind-powered electricity generation annual cost (F) mainly comprises two parts: annual cost (Fj), wind-powered electricity generation operation maintenance annual cost (Fw) are built in the wind-powered electricity generation installation.The wind-powered electricity generation total investment for construction (Ft) of installing is scaled annuity according to certain recovery of the capital coefficient (Zf) and can obtains wind-powered electricity generation installation and build annual cost, and wind-powered electricity generation operation maintenance annual cost can be calculated according to the install certain proportion (Kfw) of total investment for construction of wind-powered electricity generation.The wind-powered electricity generation annual cost can obtain the wind-powered electricity generation annual cost (Df) of unit quantity of electricity divided by wind-powered electricity generation year electricity volume (L).Concrete calculating formula is as follows:
Fj=Ft×Zf （1）
Fw=Ft×Kfw （2）
F=Fj+Fw （3）
Df=F÷L （4）
2, the calculating of electrical network annual cost
Electrical network annual cost (W) mainly comprises three parts: annual cost (Ww), network loss annual cost (Ws) are safeguarded in power grid construction annual cost (Wj), operation of power networks.Wind-powered electricity generation is sent supporting power grid construction gross investment (Wt) to be scaled annuity according to certain recovery of the capital coefficient (Zw) and can to obtain the power grid construction annual cost.Comprise two parts in the power grid construction gross investment: the one, wind-powered electricity generation collects system Construction investment (Wht); The 2nd, wind-powered electricity generation transmission system construction investment (Wst).Wind-powered electricity generation collects system and generally according to meeting the wind-powered electricity generation full capacity, sends (capacity coefficient is 1) construction, and the wind-powered electricity generation transmission system is sent construction according to meeting selected wind-powered electricity generation power factor.Operation of power networks safeguards that annual cost can be according to certain proportion (Kww) calculating of power grid construction gross investment.The network loss annual cost can be calculated according to Energy loss (Ls) and wind-powered electricity generation annual cost.Energy loss can according to wind-powered electricity generation year electricity volume and Network Loss Rate (Kws) calculate.The wind-powered electricity generation year electricity volume of electrical network annual cost after divided by deduction Energy loss (Ls) can obtain the electrical network annual cost (Dw) of unit quantity of electricity.Concrete calculating formula is as follows:
Wj=Wt×Zw （5）
Wt=Wht+Wst （6）
Ww=Wt×Kww （7）
Ws=Ls×Df （8）
Ls=L×Kws （9）
W=Wj+Ww+Ws （10）
Dw=W÷（L-Ls） （11）
3, the calculating of peak regulation annual cost
Peak regulation annual cost (T) mainly comprises three parts: peaking power source is built annual cost (Tj), peaking power source operation maintenance annual cost (Tw), peak regulation loss annual cost (Ts).Peaking power source total investment for construction (Tt) is scaled annuity according to certain recovery of the capital coefficient (Zt) can obtains peaking power source construction annual cost.Peaking power source operation maintenance annual cost can be calculated according to the certain proportion (Ktw) of peaking power source total investment for construction.Peak regulation loss of electricity (Lt) refers to the loss that peaking power source produces while being wind-powered peak regulation.For example, when thermoelectricity was wind-powered peak regulation, thermoelectricity goes out power rate to be reduced, the loss that unit quantity of electricity coal consumption increase brings; The loss that brings due to conversion efficiency during the water-storage peak regulation etc.Can calculate by the electric system production simulation electric weight that peaking power source is loss after wind-powered peak regulation, this charge value obtains peak regulation loss annual cost after multiply by above-mentioned unit quantity of electricity annual cost (wind-powered electricity generation annual cost, electrical network annual cost sum).The wind-powered electricity generation year electricity volume of peak regulation annual cost after divided by deduction network loss, peak regulation loss can obtain the peak regulation annual cost (Dt) of unit quantity of electricity.Concrete calculating formula is as follows:
Tj=Tt×Zt （12）
Tw=Tt×Ktw （13）
Ts=Lt×（Df+Dw） （14）
T=Tj+Tw+Ts （15）
Dt=T÷（L-Ls-Lt） （16）
4, the calculating of total annual cost
Unit quantity of electricity wind-powered electricity generation annual cost, electrical network annual cost, peak regulation annual cost sum are the total annual cost of unit quantity of electricity (D).
D=Df+Dw+Dt （17）
, with respect to prior art, the invention has the beneficial effects as follows:
Expenditure pattern when the present invention dissolves wind-powered electricity generation by Study system, proposed a kind of method of calculating wind-powered electricity generation useful capacity coefficient take " unit's of dissolving total annual cost of wind-powered electricity generation electric weight is minimum " as objective function; The proposition of this method, filled up the blank of large-scale wind electricity base useful capacity coefficient calculations method, avoided determining with subjective experience the situation of effective capacity coefficient, improve precision and science that large-scale wind electricity base useful capacity coefficient is chosen, for the exploitation in Chinese large-sized wind-powered electricity generation base, had important reference value.The inventive method can calculate the useful capacity coefficient in wind-powered electricity generation base accurately, the solid reference of providing for the construction of passway for transmitting electricity, the waste of avoiding overlapping construction, send passage and be equipped with peaking power source according to the construction of useful capacity coefficient, can reach the dissolve optimal economic point of wind-powered electricity generation of total system.
[description of drawings]
Fig. 1 is the wind-powered electricity generation, electrical network, peak regulation of unit quantity of electricity, the total annual cost trend map of electric capacity index variation with the wind;
Fig. 2 is wind-powered electricity generation accumulation electric weight concept map;
Fig. 3 is the wind-powered electricity generation electric weight annual cost computation structure figure of unit.
[embodiment]
Below in conjunction with accompanying drawing, the example that calculates certain large-scale wind electricity base useful capacity coefficient is elaborated.Should be emphasized that, following explanation is only exemplary, rather than in order to limit the scope of the invention and to apply.
Fig. 1 has illustrated the wind-powered electricity generation base for a definite installed capacity, when choosing the different capabilities coefficient, and the variation tendency of the wind-powered electricity generation of unit quantity of electricity, electrical network, peak regulation, total annual cost.In the expense of unit wind-powered electricity generation electric weight, wind-powered electricity generation expense (specifically seeing the curve 1 in Fig. 1) is opposite with the trend of electrical network expense (specifically seeing the curve 2 in Fig. 1), peak regulation expense (specifically seeing the curve 3 in Fig. 1), and the total annual cost curve after 3 curve combinings there will be minimum point (specifically seeing the curve 4 in Fig. 1).The wind-powered electricity generation capacity coefficient that this point is corresponding is wind-powered electricity generation useful capacity coefficient.
Fig. 2 has illustrated wind-powered electricity generation exert oneself-the accumulate concept of electric weight: wind-powered electricity generation is exerted oneself and is comprised of two parts from 0 to certain accumulation electric weight of exerting oneself between p, and a part is the generated energy of wind-powered electricity generation while exerting oneself less than p, and another part is that wind-powered electricity generation is positioned at the electric weight below p while exerting oneself greater than p.The historical data of exerting oneself by wind-powered electricity generation can count the wind-powered electricity generation electric quantity curve of exerting oneself-accumulate.When calculating the useful capacity coefficient, can obtain exerting oneself of wind-powered electricity generation according to the wind-powered electricity generation capacity coefficient of choosing, can obtain the accumulation electric weight of this value of exerting oneself correspondence by the inquiry wind-powered electricity generation electric quantity curve of exerting oneself-accumulate.For example, according to the wind-powered electricity generation base, the Northwest of historical data statistics, exert oneself-accumulate the electric weight characteristic in Table 1,0～0.45 of this wind-powered electricity generation base interval accumulation electric weight of exerting oneself has reached 95.78% of whole electric weight.
Electric weight characteristic unit: p.u. exerts oneself-accumulates in the wind-powered electricity generation base in table 1 the Northwest
| The interval of exerting oneself | 0～0 | 0～0.05 | 0～0.10 | 0～0.15 | 0～0.20 | 0～0.25 | 0～0.30 | 0～0.35 | 0～0.40 | 0～0.45 | 0～0.50 |
| The accumulation electric weight | 0.0000 | 0.2109 | 0.3770 | 0.5140 | 0.6292 | 0.7267 | 0.8081 | 0.8738 | 0.9235 | 0.9578 | 0.9795 |
| The interval of exerting oneself | 0～0.55 | 0～0.60 | 0～0.65 | 0～0.70 | 0～0.75 | 0～0.80 | 0～0.85 | 0～0.90 | 0～0.95 | 0～1.00 | / |
| The accumulation electric weight | 0.9919 | 0.9977 | 0.9996 | 1.0000 | 1.0000 | 1.0000 | 1.0000 | 1.0000 | 1.0000 | 1.0000 | / |
With reference to shown in Figure 3, the computing method concrete steps of a kind of large-scale wind electricity of the present invention base useful capacity coefficient are as follows:
Step 1: determine wind-powered electricity generation base installed capacity of wind-driven power Z, choose the capacity coefficient k of wind-powered electricity generation.
The span of wind-powered electricity generation capacity coefficient k is 0～1.0, and for reducing amount of calculation, the span of k can suitably be reduced according to the wind-powered electricity generation statistical property.For example, certain wind-powered electricity generation base statistics maximum output coefficient is no more than 0.75, and the upper limit of k is desirable 0.75, and its lower limit also can be according to performance prediction, such as getting 0.25.
Step 2: according to installed capacity of wind-driven power, calculate the wind-powered electricity generation annual cost; According to the wind-powered electricity generation electric weight family curve of exerting oneself-accumulate, find out obtainable wind-powered electricity generation electricity volume under this capacity coefficient, calculate the wind-powered electricity generation annual cost while obtaining unit wind-powered electricity generation electric weight.
Wind-powered electricity generation annual cost (F) mainly comprises two parts: annual cost (Fj), wind-powered electricity generation operation maintenance annual cost (Fw) are built in the wind-powered electricity generation installation.With the wind-powered electricity generation total investment for construction (Ft that installs, can be according to the per kilowatt investment estimate) be scaled annuity according to certain recovery of the capital coefficient (Zf) and can obtain the wind-powered electricity generation installation and build annual cost, wind-powered electricity generation operation maintenance annual cost can be calculated according to the install certain proportion (Kfw) of total investment for construction of wind-powered electricity generation.The wind-powered electricity generation annual cost can obtain the wind-powered electricity generation annual cost (Df) of unit quantity of electricity divided by wind-powered electricity generation year electricity volume (L checks in by the wind-powered electricity generation electric weight family curve of exerting oneself-accumulate).Concrete calculating formula is as follows:
Fj=Ft×Zf （1）
Fw=Ft×Kfw （2）
F=Fj+Fw （3）
Df=F÷L （4）
Step 3:, according to the wind-powered electricity generation capacity coefficient of choosing, determine wind-powered electricity generation passway for transmitting electricity construction scale and Transmission Loss, calculate electrical network annual cost and unit electrical network annual cost.
Electrical network annual cost (W) mainly comprises three parts: annual cost (Ww), network loss annual cost (Ws) are safeguarded in power grid construction annual cost (Wj), operation of power networks.Wind-powered electricity generation is sent supporting power grid construction gross investment (Wt, can according to the per kilowatt investment estimate) to be scaled annuity according to certain recovery of the capital coefficient (Zw) and can to obtain the power grid construction annual cost.Comprise two parts in the power grid construction gross investment: the one, wind-powered electricity generation collects system Construction investment (Wht); The 2nd, wind-powered electricity generation transmission system construction investment (Wst).Wind-powered electricity generation collects system and generally according to meeting the wind-powered electricity generation full capacity, sends (capacity coefficient is 1) construction, and the wind-powered electricity generation transmission system is sent construction according to meeting selected wind-powered electricity generation power factor.Operation of power networks safeguards that annual cost can be according to certain proportion (Kww) calculating of power grid construction gross investment.The network loss annual cost can be calculated according to Energy loss (Ls) and wind-powered electricity generation annual cost.Energy loss can calculate according to wind-powered electricity generation year electricity volume L and Network Loss Rate (Kws).The wind-powered electricity generation year electricity volume of electrical network annual cost after divided by deduction Energy loss (Ls) can obtain the electrical network annual cost (Dw) of unit quantity of electricity.Concrete calculating formula is as follows:
Wj=Wt×Zw （5）
Wt=Wht+Wst （6）
Ww=Wt×Kww （7）
Ws=Ls×Df （8）
Ls=L×Kws （9）
W=Wj+Ww+Ws （10）
Dw=W÷（L-Ls） （11）
Step 4:, according to the wind-powered electricity generation capacity coefficient of choosing, determine the peak that system need to provide, according to production simulation, determine peaking power source arrangement and peak regulation loss, calculate peak regulation annual cost and unit peak regulation annual cost.
Peak regulation annual cost (T) mainly comprises three parts: peaking power source is built annual cost (Tj), peaking power source operation maintenance annual cost (Tw), peak regulation loss annual cost (Ts).Peaking power source total investment for construction (Tt, can according to the per kilowatt investment estimate) is scaled annuity according to certain recovery of the capital coefficient (Zt) can be obtained peaking power source and build annual cost.Peaking power source operation maintenance annual cost can be calculated according to the certain proportion (Ktw) of peaking power source total investment for construction.Peak regulation loss of electricity (Lt) refers to the loss that peaking power source produces while being wind-powered peak regulation.For example, when thermoelectricity was wind-powered peak regulation, thermoelectricity goes out power rate to be reduced, the loss that unit quantity of electricity coal consumption increase brings; The loss that brings due to conversion efficiency during the water-storage peak regulation etc.Can calculate by the electric system production simulation electric weight that peaking power source is loss after wind-powered peak regulation, this charge value obtains peak regulation loss annual cost after multiply by above-mentioned unit quantity of electricity annual cost (wind-powered electricity generation annual cost, electrical network annual cost sum).The wind-powered electricity generation year electricity volume of peak regulation annual cost after divided by deduction network loss, peak regulation loss can obtain the peak regulation annual cost (Dt) of unit quantity of electricity.Concrete calculating formula is as follows:
Tj=Tt×Zt （12）
Tw=Tt×Ktw （13）
Ts=Lt×（Df+Dw） （14）
T=Tj+Tw+Ts （15）
Dt=T÷（L-Ls-Lt） （16）
Step 5: total annual cost of unit of account wind-powered electricity generation electric weight.
Unit quantity of electricity wind-powered electricity generation annual cost, electrical network annual cost, peak regulation annual cost sum are the total annual cost of unit quantity of electricity (D).
D=Df+Dw+Dt （17）
Step 6: choose new wind-powered electricity generation capacity coefficient, repeating step 2 to 5, until the minimum point of the total annual cost of the unit of finding out, the capacity coefficient that this point is corresponding is the useful capacity coefficient.
In iterative process, the change step of k value is as the criterion with the precision that meets engineering design.For example, the wind-powered electricity generation base of installation 10000MW, it sends requirement of engineering precision 500MW, and step-length desirable 0.05.
Below the invention will be further described as example take wind-powered electricity generation base, northwest useful capacity coefficient calculations process.
Installed capacity of wind-driven power is 10000MW, and according to the wind-powered electricity generation statistical property, wind-powered electricity generation capacity coefficient value is 0.25 to 0.75, iteration step length 0.05.Corresponding different capacity coefficient values, the passway for transmitting electricity capacity that the wind-powered electricity generation base needs, peak, obtainable wind-powered electricity generation electricity volume are in Table 2, and the configuration of peaking power source arranges according to Northwest Grid electrical production analog computation result.
According to the electrical network actual conditions, the Main Economic parameter of employing is in Table 3.The annual cost result of calculation of unit wind-powered electricity generation electric weight is shown in Table 4.The total annual cost of unit quantity of electricity during wind-powered electricity generation capacity coefficient 0.5 reaches minimum, and this value is required wind-powered electricity generation useful capacity coefficient.
To capacity coefficient, be below 0.75 o'clock, unit quantity of electricity wind-powered electricity generation annual cost, electrical network annual cost, peak regulation annual cost are calculated detailed process and are described in detail.
1, unit quantity of electricity wind-powered electricity generation annual cost is calculated
Annual cost Fj=Ft * Zf=(10000 * 10 are built in the wind-powered electricity generation installation
3* 0.75) * 0.1019=76.39 * 10
4(ten thousand yuan);
Wind-powered electricity generation operation maintenance annual cost Fw=Ft * Kfw=(10000 * 10
3* 0.75) * 1.5%=11.25 * 10
4(ten thousand yuan);
Wind-powered electricity generation annual cost F=Fj+Fw=76.39 * 10
4+ 11.25 * 10
4=87.64 * 10
4(ten thousand yuan);
The wind-powered electricity generation annual cost Df=F ÷ L=(87.64 of unit quantity of electricity * 10
4) ÷ (187.5 * 10
4)=0.4674 yuan/degree.
2, unit quantity of electricity electrical network annual cost
Power grid construction annual cost Wj=Wt * Zw=(Wht+Wst) * Zw=(10000 * 10
3* 0.05+10000 * 10
3* 0.75 * 0.3) * 0.1019=26.74 * 10
4(ten thousand yuan);
Annual cost Ww=Wt * Kww=(Wht+Wst) * Kww=(10000 * 10 are safeguarded in operation of power networks
3* 0.05+10000 * 10
3* 0.75 * 0.3) * 1%=2.63 * 10
4(ten thousand yuan);
Network loss annual cost Ws=Ls * Df=L * Kws * Df=(187.5 * 10
4) * 2% * 0.4674=1.75 * 10
4(ten thousand yuan);
Electrical network annual cost W=Wj+Ww+Ws=26.74 * 10
4+ 2.63 * 10
4+ 1.75 * 10
4=31.11 * 10
4(ten thousand yuan);
Unit quantity of electricity electrical network annual cost Dw=W ÷ (L-Ls)=31.11 * 10
4÷ (187.5 * 10
4-1.75 * 10
4)=0.1693 yuan/degree.
3, unit quantity of electricity peak regulation annual cost
Calculate through production simulation, be the peak regulation (10000MW installation, 0.75 capacity coefficient) that meets the 7500MW wind-powered electricity generation, system need to be extended hydropower installed capacity 1650MW, newly-built water-storage installed capacity 960MW.Peak regulation loss of electricity 1.414 hundred million degree.
Enlarging construction of hydropower facilities annual cost Tj=Tt * Zt=1650 * 10
3* 0.1 * 0.1019=1.68 * 10
4(ten thousand yuan);
Enlarging water power operation maintenance annual cost Tw=Tt * Ktw=1650 * 10
3* 0.1 * 1%=0.165 * 10
4(ten thousand yuan);
Annual cost Tj=Tt * Zt=960 * 10 are built in newly-built water-storage
3* 0.6 * 0.1019=5.87 * 10
4(ten thousand yuan);
Newly-built water-storage operation maintenance annual cost Tw=Tt * Ktw=960 * 10
3* 0.1 * 1.8%=1.037 * 10
4(ten thousand yuan);
Peak regulation loss annual cost Ts=Lt * (Df+Dw)=1.414 * (0.4674+0.1693)=0.9 * 10
4(ten thousand yuan);
Peak regulation annual cost T=Tj+Tw+Ts=(1.68 * 10
4+ 5.87 * 10
4)+(0.165 * 10
4+ 1.037 * 10
4)+0.9 * 10
4=9.65 * 10
4(ten thousand yuan);
The peak regulation annual cost Dt=T ÷ (L-Ls-Lt)=9.65 * 10 of unit quantity of electricity
4÷ (187.5 * 10
4-187.5 * 10
4* 2%-1.414)=0.0529 yuan/degree.
4, total annual cost of unit wind-powered electricity generation electric weight
Total annual cost D=Df+Dw+Dt=0.4674+0.1693+0.0529=0.6897 unit/degree of unit wind-powered electricity generation electric weight.
Passway for transmitting electricity, peaking power source configuration under table 2 different capabilities coefficient
The Main Economic parameter that table 3 adopts
| Project | Parameter | Project | Parameter |
| Wind-powered electricity generation body specific investment | 0.75 ten thousand yuan/kilowatt | Electrical network annuity coefficient (Zw) | 0.1019 |
| Wind-powered electricity generation year operation maintenance rate (Kfw) | 1.50% | The machine specific investment is expanded in power station | 0.1 ten thousand yuan/kilowatt |
| Wind-powered electricity generation annuity coefficient (Zf) | 0.1019 | Water power operation maintenance rate (Ktw1) | 1% |
| Wind-powered electricity generation collects the system unit investment | 0.05 ten thousand yuan/kilowatt | Water power annuity coefficient (Zt1) | 0.1019 |
| Wind-powered electricity generation is sent the passage specific investment | 0.3 ten thousand yuan/kilowatt | The pumped storage specific investment | 0.6 ten thousand yuan/kilowatt |
| Network Loss Rate (Kws) | 2% | Pumped storage operation maintenance rate (Ktw2) | 1.80% |
| Rate (Kww) is safeguarded in operation of |
1% | Pumped storage annuity coefficient (Zt2) | 0.1019 |
Table 4 wind-powered electricity generation unit quantity of electricity annual cost result of calculation
Claims (7)
1. the computing method of a large-scale wind electricity base useful capacity coefficient, is characterized in that, comprises the following steps:
Step 1: determine wind-powered electricity generation base installed capacity of wind-driven power Z, choose the capacity coefficient k of wind-powered electricity generation;
Step 2: the wind-powered electricity generation annual cost of calculating wind-powered electricity generation annual cost and unit quantity of electricity according to installed capacity of wind-driven power;
Step 3:, according to the wind-powered electricity generation capacity coefficient of choosing, determine wind-powered electricity generation passway for transmitting electricity construction scale and Transmission Loss, calculate the electrical network annual cost of electrical network annual cost and unit quantity of electricity;
Step 4:, according to the wind-powered electricity generation capacity coefficient of choosing, determine the peak that system need to provide, according to production simulation, determine peaking power source arrangement and peak regulation loss, calculate the peak regulation annual cost of peak regulation annual cost and unit quantity of electricity;
Step 5: total annual cost of unit of account wind-powered electricity generation electric weight;
Step 6: choose new wind-powered electricity generation capacity coefficient, repeating step 2 to 5, until the minimum point of the total annual cost of the unit of finding out, the capacity coefficient that this point is corresponding is the useful capacity coefficient.
2. the computing method of a kind of large-scale wind electricity according to claim 1 base useful capacity coefficient, is characterized in that, step 6 is in iterative process, and the change step of k value equals the wind-powered electricity generation base and sends the precision of engineering design.
3. the computing method of a kind of large-scale wind electricity according to claim 1 base useful capacity coefficient, it is characterized in that, step 2 specifically comprises: according to the wind-powered electricity generation electric weight family curve of exerting oneself-accumulate, find out obtainable wind-powered electricity generation electricity volume under this capacity coefficient, calculate the wind-powered electricity generation annual cost while obtaining unit wind-powered electricity generation electric weight;
Concrete calculating formula is as follows:
Fj=Ft×Zf （1）
Fw=Ft×Kfw （2）
F=Fj+Fw （3）
Df=F÷L （4）
Wherein, F is the wind-powered electricity generation annual cost; Fj is that annual cost is built in the wind-powered electricity generation installation; Fw is wind-powered electricity generation operation maintenance annual cost; Ft is wind-powered electricity generation installation total investment for construction; Zf is the recovery of the capital coefficient; Kfw is the ratio that wind-powered electricity generation operation maintenance annual cost accounts for wind-powered electricity generation installation total investment for construction; L is wind-powered electricity generation year electricity volume; Df is the wind-powered electricity generation annual cost of unit quantity of electricity.
4. the computing method of a kind of large-scale wind electricity according to claim 1 base useful capacity coefficient, is characterized in that, in step 3, concrete calculating formula is as follows:
Wj=Wt×Zw （5）
Wt=Wht+Wst （6）
Ww=Wt×Kww （7）
Ws=Ls×Df （8）
Ls=L×Kws （9）
W=Wj+Ww+Ws （10）
Dw=W÷（L-Ls） （11）
Wherein, W is the electrical network annual cost; Wj is the power grid construction annual cost; Ww is that annual cost is safeguarded in operation of power networks; Ws is the network loss annual cost; Wt is for to send supporting power grid construction gross investment with wind-powered electricity generation; Zw is the recovery of the capital coefficient; Wht is that wind-powered electricity generation collects the system Construction investment; Wst is the construction investment of wind-powered electricity generation transmission system; Kww is that operation of power networks safeguards that annual cost accounts for the ratio of power grid construction gross investment; Ls is Energy loss; L is wind-powered electricity generation year electricity volume; Kws is Network Loss Rate; Dw is the electrical network annual cost of unit quantity of electricity.
5. the computing method of a kind of large-scale wind electricity according to claim 1 base useful capacity coefficient, is characterized in that, in step 4, concrete calculating formula is as follows:
Tj=Tt×Zt （12）
Tw=Tt×Ktw （13）
Ts=Lt×（Df+Dw） （14）
T=Tj+Tw+Ts （15）
Dt=T÷（L-Ls-Lt） （16）
Wherein, T is the peak regulation annual cost; Tj is that peaking power source is built annual cost; Tw is peaking power source operation maintenance annual cost; Ts is peak regulation loss annual cost; Tt is the peaking power source total investment for construction; Zt is the recovery of the capital coefficient; Ktw is the ratio that peaking power source operation maintenance annual cost accounts for the peaking power source total investment for construction; Lt is the peak regulation loss of electricity; Dt is the peak regulation annual cost of unit quantity of electricity.
6. the computing method of a kind of large-scale wind electricity according to claim 1 base useful capacity coefficient, it is characterized in that, in step 5, the total annual cost of unit quantity of electricity equals the wind-powered electricity generation annual cost of unit quantity of electricity, the electrical network annual cost of unit quantity of electricity and the peak regulation annual cost sum of unit quantity of electricity.
7. a large-scale wind electricity base passway for transmitting electricity holds method for determination of amount, it is characterized in that, adopt the described useful capacity coefficient of step 6) of the computing method of the described a kind of large-scale wind electricity of any one base useful capacity coefficient in claim 1 to 6 to carry out the planning of passway for transmitting electricity, the capacity of passway for transmitting electricity equals this large-scale wind electricity base installed capacity of wind-driven power and the useful capacity coefficient is long-pending.
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| CN112186751A (en) * | 2020-09-24 | 2021-01-05 | 中国电力工程顾问集团西北电力设计院有限公司 | New energy effective capacity calculation method and system considering grid constraints |
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