CN102882214A - Voltage class combination selecting method for high-voltage distribution network in rural area - Google Patents
Voltage class combination selecting method for high-voltage distribution network in rural area Download PDFInfo
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Abstract
The invention discloses a voltage class combination selecting method for a high-voltage distribution network in a rural area. The voltage class combination selecting method provides a calculation method for power supply radiuses within a planning period, enables influences of the power supply radius average change rate per annum and the load average growth rate per annum to be taken into consideration for calculation of operating cost and construction cost, and realizes more precision economical comparison of different voltage class selection schemes. The method includes: (1) using a novel load saturation annual power supply radius calculation method to determine a power supply radius; (2) calculating the construction cost of a substation with consideration of influences of the power supply radius on the power line length; (3) calculating the operating cost with consideration of influences of the power supply radius on the power line length and the transmission load of the substation; and (4) evaluating the voltage class selection schemes according to the calculated construction cost and the operating cost. Since power supply radius and load change influences in a depreciation period are taken into consideration, accuracy in evaluation on economy of the voltage class combination schemes is greatly improved by means of the voltage class combination selecting method.
Description
Technical field
The present invention relates to the high voltage distribution network Voltage Class system of selection of a kind of rural area, belong to electrical engineering planning technology field.
Background technology
Electric pressure is problem the most basic in the electric network composition.Electric pressure is chosen, and the unreasonable network loss that will cause increases, and rate of qualified voltage is low, the power supply safety poor reliability, and build a series of adverse consequencess such as maintenance cost increase.At present, the rural areas in our country high voltage distribution network generally adopts 35/10kV and two kinds of Voltage Class of 110/10kV.Under the condition low in the circuit load factor, that the insulation expense is high, adopt the scheme of 35/10kV to suit.But along with the continuous growth of town and country loads, the power supply capacity deficiency will appear in this scheme, quality of voltage is poor and the problem such as line loss electric weight height.For addressing the above problem, all adopted the 110/10kV Voltage Class in the developed area.The advantage of cancellation 35kV electric pressure comprises: (1) has reduced the energy loss of 35kV electric pressure; (2) equipment investment of saving 35kV electric pressure; (3) reduce 35kV electric pressure operation link, improve power supply reliability.
The selection of Voltage Class is relevant with construction, the operating cost of regional load level, service area's area and this electric pressure power transmission and transforming equipment, select the combination of which kind of electric pressure to bring maximum economic benefit for power supply enterprise, need to determine by technology, economic comparison.Load density is the main judging quota that present regional Voltage Class is selected.Under the known condition of the average supply district of regional transformer station, this index can be obtained the load that every transformer station on average send down, and then the comparison by operation, construction cost under the different schemes, determines to be fit to the Voltage Class that adopts.Such as the technical literature (" reasonable disposition of urban distribution network electric pressure ") of delivering on " electric power network technique " (the 30th volume the 10th phase 64-68 page or leaf in 2006); The document of delivering on " electric power network technique " (the 35th volume the 2nd phase 88-93 page or leaf in 2011) (" the Technological Economy Journal of Sex Research of Hunan Electric Grid development 20kV power distribution network "); The document (" city net distribution voltage grade research ") of delivering on the document of delivering on " for electricity consumption " (the 20th volume the 4th phase 17-20 page or leaf in 2003) " Shanghai Power Network high-voltage distribution network electric pressure Technological Economy relatively " and " electric power network technique " (the 23rd volume the 2nd phase 31-33 page or leaf in 1999).These documents all are to determine that by the size of regional load density this area is fit to the Voltage Class that adopts.
In load density method, transformer station's radius of electricity supply definite most important because it not only determines the length of transformer station's power circuit, and determining the load sent under the transformer station.But, in project period transformer station's radius of electricity supply determine very difficult because its increasing and progressively reduces but also along with the variation of power circuit buckling factor changes with transformer station in the landing pit not only.At present, all technical literatures all adopt fixing empirical value or obtain by simple estimation when the setting of radius of electricity supply, do not consider this parameter within project period situation of change and project period internal loading the growth situation of change, cause result of calculation too rough.As obtaining the power supply area for the ratio of load and load density by transformer station in 2007 Shanghai Communications University's master thesis " urban power distribution network electric pressure and powering mode Study on selection ", and then try to achieve radius of electricity supply, but the load density itself in project period is exactly a changing value, can not be set as simply a constant; For comparing the economy of 110kV and 35kV power supply, document " Shandong Electric Power Group technology ", " choosing of city net rural power grids high voltage distribution network electric pressure " adopts empirical value to choose radius of electricity supply in the 2nd phase 29-32 pages or leaves in 1994, and do not consider the variation of radius of electricity supply within project period; Document " current situation and development of electrical network distribution voltage---the Necessity and feasibility two of 20kV power distribution network is carried out by the opinion of holding concurrently China both at home and abroad " (" electrotechnics ", the 10th phase 1-5 page or leaf in 1996) describes the Construction and operation cost curve of various schemes under the different load density in, do not considered equally load density and the radius of electricity supply situation of change within project period.In sum, there is no at present effective, practical method and estimate average supply district and the load density of regional transformer station in project period, and then can't estimate relatively accurately the Voltage Class that the area is fit to employing, the invention provides a kind of new Voltage Class choosing method.
Summary of the invention
The objective of the invention is, select the problem of planning existence according to existing distribution network voltage grade, a kind of new Voltage Class evaluation method is proposed, the method has provided the computational methods of radius of electricity supply in project period, make the calculating of operating cost and construction cost can consider the to load impact of average growth rate per annum and the average annual rate of change of radius of electricity supply, realize each scheme economy is compared more accurately.
Technical scheme of the present invention is, under the condition of considering radius of electricity supply and load variations in depreciation period, calculates construction and operating cost under the different schemes, thereby electric pressure selection scheme economy is compared evaluation.
The present invention chooses mainly for rural areas in our country high voltage distribution network Voltage Class, therefore only with 110/10kV (scheme one) and two kinds of assembled schemes of 35/10kV (scheme two) object as a comparison.According to " rural power network planning and designing guide rule " regulation (DL/T5118-2000), 110kV and 35kV transformer station all need be furnished with reactive-load compensation equipment, process therefore its low-pressure side 10kV bus can be used as the power supply of voltage constant.Therefore with regard to the 10kV circuit, can think that 110kV is identical with 35kV transformer station radius of electricity supply.
Under the condition of not considering maintenance cost and scraping expense difference, if formula (1) is set up, show that then the supply power mode of the 110kV/10kV of this area is better than the supply power mode of 35kV/10kV electric pressure.
(
W c1
+
W p1
)<(
W c2
+W p2
) （1）
In the formula:
W c1
With
W c2
Be respectively scheme 1 and the construction cost of scheme in 2 depreciation periods;
W p1
With
W p2
Be respectively scheme 1 and the operating cost of scheme in 2 depreciation periods, i.e. wear and tear expense.Herein, with future value standard as a comparison.
Rural area of the present invention high voltage distribution network Voltage Class system of selection may further comprise the steps:
Determining of the first step, radius of electricity supply
The size of radius of electricity supply is not only determining the length of power circuit, is also determining the load of sending under the transformer station.Therefore radius of electricity supply determines that operating cost and construction cost are had vital impact.Herein, the present invention proposes the saturated year radius of electricity supply computational methods of a kind of new load, and then the radius of electricity supply that can determine the depreciation end of term by average annual rate of change and the time limit of depreciation period of radius of electricity supply.
In general, the quantity of the buckling factor of 10kV circuit and its power supply relation of being inversely proportional to.Therefore, the radius of electricity supply in saturated year of load
R f Can be determined by following equation:
In the formula: subscript
fWith
cRepresentative was loaded saturated year and is worked as the year before last respectively;
l10kV line length for the power supply point of loading farthest;
kFor 10kV circuit farthest to radius of electricity supply
RBuckling factor;
RBe radius of electricity supply;
mBe 10kV power supply number, i.e. the number of 35kV and 110kV transformer station;
SBe service area's area.
In the formula (2), when the power supply number of the year before last
m c , buckling factor
k c Be given value; The object of planning year rural area 10kV line length upper limit of power supply point of loading farthest
l f In state net company power distribution network technology guide rule regulation being arranged, also is given value.Therefore, only have
k f ,
m f With
R f Be unknown quantity, and the equation equation also there are three, can determine the unique solution of target year radius of electricity supply.
The calculating of second step, construction cost
Construction cost is the required expense of the investment construction of transformer station, generally all consider as a fixed value, but from the project period of a long period, owing to reasons such as the π of new transformer station enter, the construction cost of power circuit can reduce along with the reduction of radius of electricity supply and buckling factor.Therefore, the construction cost of depreciation end of term power circuit is not by its construction length originally, but is determined by radius of electricity supply and the buckling factor in the depreciation end of term.
Suppose that the somewhere needs
yArrive saturated year of load year, then the average annual rate of descent of radius of electricity supply and buckling factor is respectively:
In the formula: subscript
fWith
cRepresentative was loaded saturated year and is worked as the year before last respectively;
RBe radius of electricity supply;
KBuckling factor for power circuit;
d r With
d k Be respectively the average annual rate of descent of radius of electricity supply and buckling factor.
Suppose saturated year of load greater than equipment depreciation year, under the condition of taking into account radius of electricity supply and buckling factor rate of change, depreciation end of term transformer substation construction expense
W c Calculation expression as the formula (5), derivation is seen appendix.Because 110kV is identical with the radius of electricity supply of 35kV transformer station, the construction criteria of its 10kV electrical network is consistent, so locate not consider the construction cost of 10kV network.
W c =
（5）
In the formula:
X t With
X l Be respectively the construction cost of transformer station's converting equipment and unit length power circuit;
L c For the power circuit length of building (comprises the stand-by power supply circuit
L b Interior);
iBe bank's Annual Percentage Rate;
nBe the depreciation time limit.
The calculating of the 3rd step, operating cost
Operating cost mainly comprises the wear and tear expense of power circuit and transformer.After the Annual Percentage Rate of the average annual rate of change of taking into account the average growth rate per annum of load, radius of electricity supply and operating cost, the wear and tear expense value of depreciation end of term power circuit and transformer is respectively suc as formula shown in (6) and the formula (7).Equally, because the construction criteria of 10kV electrical network is consistent, do not consider the kwh loss expense of 10kV network herein.
In the formula:
W l With
W t Be respectively the wear and tear expense of power circuit and transformer; Integration variable
xBe year;
ρLoad density for the area;
The
xThe radius of electricity supply in year;
tAnnual growth for load;
Be
xThe burden with power in year;
r 0Resistance per unit length for power circuit;
LFor transformer station under the normal operating mode be subjected to electric line length, its value equals power circuit length
L c Deduct the stand-by power supply line length
L b 
Be
xYear, transformer station was subjected to electric line length;
φBe power-factor angle;
VBe the transforming plant main transformer high side voltage;
T MaxBe regional number of working hours based on maximum load;
cBe electricity price;
r t Short-circuit resistance for transformer.
The evaluation of the 4th step, scheme
According to the construction cost and the operating cost that calculate gained, through type (1) can be estimated the electric pressure selection scheme.
The derivation of depreciation end of term transformer substation construction expense calculation expression is as follows in the second step of the present invention:
In not considering, under the condition of low-voltage equipment construction cost, the construction cost of transformer station is mainly divided converting equipment and power circuit two parts, shown in (8).
W c =
X t +
X L （8）
Wherein,
X L Construction cost for power circuit behind the consideration extension wire.
For converting equipment, the factors such as its construction cost and radius of electricity supply are irrelevant, therefore can think that construction cost is constant, therefore the construction cost of depreciation end of term converting equipment behind the consideration Interests
X t f For:
X t f =
（9）
For power circuit, owing to reasons such as the π of new transformer station enter, its construction cost can reduce along with the reduction of radius of electricity supply and buckling factor.Therefore at the average annual rate of change of radius of electricity supply
d r With the average annual rate of change of buckling factor
d k Known, and do not consider under the condition of Interests the construction cost in its depreciation end of term
X L f Can be expressed as:
X L f =
（10）
For
xYear, the interest expense that its power circuit produces should be the interest of construction cost last year
With compound interest
Sum:
For rear the 1st year of operation,
Interest rate is
X L iFor going into operation rear the 2nd year, interest rate is
d r d k X L i+
X L i(1+
i); For after going into operation the 3rd year, interest rate be (
d r d k )
2 X L i+
d r d k X L i(1+
i)+
X L i(1+
i)
2For after going into operation the 4th year, interest rate be (
d r d k )
3 X L i+ (
d r d k )
2 X L i(1+
i)+
d r d k X L i(1+
i)
2+
X L i(1+
i)
3
Can find out by above-mentioned derivation, after going into operation the
nYear, interest rate is:
The employing integrated form is expressed as:
Therefore, in the depreciation end of term, construction cost can be expressed as:
W c =
X t f +
X L f +
=
The present invention's beneficial effect compared with the prior art is, provided the evaluation method of radius of electricity supply in project period, and considered the variable effect of radius of electricity supply and load growth in the calculating of construction cost and operating cost, improved the accuracy of evaluation result.
The present invention is applicable to choosing and Economic Evaluation regional line voltage grade combination.
Description of drawings
Fig. 1 is bus arrangement mode schematic diagram;
Fig. 2 is that total cost is to the sensitivity relation of load;
Fig. 3 is that critical load density is to the sensitivity relation of load average growth rate per annum;
Figure number represents among Fig. 1: the 1st, and supply district; The 2nd, upper level power supply; The 3rd, electric pressure to be studied transformer station; The 4th, under the normal operating mode transformer station be subjected to electric line,
LBe its length;
L b The length of stand-by power supply circuit;
RIt is the radius of electricity supply of transformer station.
Embodiment
The present embodiment is implemented under take technical solution of the present invention as prerequisite, has provided detailed execution mode and concrete operating process.
The embodiment of the invention makes up as a comparison object with two kinds of 110/10kV (scheme one) and 35/10 kV (scheme two), calculate construction and operating cost under interior two kinds of different schemes of whole depreciation period, and in the calculating of construction cost and operating cost, consider the variable effect of radius of electricity supply and load growth, thereby the electric pressure selection scheme is estimated.
Before the evaluation, determine first evaluation criterion.
With future value standard as a comparison.If formula (1) is set up, namely (
W c1
+
W p1
)＜(
W c2
+ W p2
), then can cancel in this area 35kV electric pressure, adopt the mode of 110kV/10kV to power.In the formula:
W c1
With
W c2
Be respectively scheme 1 and the construction cost of scheme in 2 depreciation periods;
W p1
With
W p2
Be respectively scheme 1 and the operating cost of scheme in 2 depreciation periods, i.e. wear and tear expense.
The present embodiment is implemented by following steps.
Determining of first step radius of electricity supply
Because the buckling factor of 10kV circuit and the quantity relation of being inversely proportional to of its power supply are therefore at the buckling factor when the circuit the year before last
k c , radius of electricity supply
R c , the power supply number
m c With saturated year nose road of load length
l f Under the known condition, through type (2) can be obtained saturation loading year radius of electricity supply
R f Value.
The calculating of second step construction cost
From the project period of a long period, owing to reasons such as the π of new transformer station enter, the construction cost of power circuit can reduce along with the reduction of radius of electricity supply.Therefore, the construction cost of depreciation end of term power circuit is not only relevant with the line length of building originally, and is also relevant with buckling factor with the radius of electricity supply in the depreciation end of term.
Suppose that the somewhere needs
yYear arrived load saturated year, then the average annual rate of descent of radius of electricity supply and buckling factor can be distinguished through type (3) and formula (4) is definite.
Because 110kV is identical with the radius of electricity supply of 35kV transformer station, the construction criteria of its 10kV electrical network is consistent, thus scheme relatively in can not consider the construction cost of 10kV network.Suppose that load is saturated year greater than equipment depreciation year, under the known condition of radius of electricity supply and the average annual rate of descent of buckling factor, depreciation end of term transformer substation construction expense
W c But through type (5) is definite,
W c =
（5）。
The calculating of the 3rd step operating cost
Operating cost mainly comprises the wear and tear expense of power circuit and transformer.After under the condition of taking into account load average growth rate per annum, the average annual rate of change of radius of electricity supply and operating cost Annual Percentage Rate, the wear and tear expense value of depreciation end of term power circuit and transformer can distinguish through type (6) and formula (7) is determined.
The evaluation of the 4th step scheme
According to the construction cost and the operating cost that calculate gained, through type (1) can be estimated the electric pressure selection scheme.
The present embodiment is by the validity of certain province rural area electrical network checking institute extracting method in 2010, and verification environment is set to: 2010, certain province rural area area was
S=15.53 ten thousand square kilometres; The electricity consumption peak load
P c =4000MW; Number of working hours based on maximum load
T Max=3000h; 10kV power supply number
m c =881, wherein 110kV transformer station is 110,771 in 35kV transformer station; Transformer station is subjected to the electric line average length under the normal operating mode
L=24km, power factor (PF) cos
φ=0.95; The longest 10kV circuit average length is
l c =30km; Power factor (PF) is cos
φ 10=0.9; Bank's Annual Percentage Rate
i=0.1; Electricity price
c=0.6 yuan/kWh; Year number after this province's rural area load reaches capacity
y=30; The depreciation period of power transformation and line facility
nBe 25 years; Main transformer and line parameter circuit value are as shown in table 1, and unit price is as shown in table 2.
Table 1 main transformer and line parameter circuit value setting
Table 2 project unit price
| Project | Parameter | Depreciable life | Unit price |
| 110/ |
1×40 |
25 years | 2,000 ten thousand yuan/ |
| 35/ |
2×10 |
25 years | 1,200 ten thousand yuan/ |
| The 110kV circuit | 240 |
25 years | 700,000 yuan/km |
| The 35kV circuit | 185 |
25 years | 400,000 yuan/km |
The mode of connection that this province's high voltage distribution network generally adopts the bilateral source list to go back to 2 transformer stations of serial connection, as shown in Figure 1.Suppose that 110kV and 35kV transformer station supply district are circle, radius is
R, then its economic length that is subjected to electric line is 2 under the normal operating mode
RConsider the buckling factor of circuit
KAfter, it is subjected to the length of electric line
L=2
KRExtension wire length
L b =0.5
L=
KR
According to the setting of calculating parameter as can be known, this economizes rural area load density in 2010
ρ c =
P c /
S=25.76kw/km
2Radius of electricity supply
R c =
=7.5km; The buckling factor of transformer station's power circuit
K c =
L/2
R c =1.6; Extension wire length
L b =0.5
L=12km; The longest medium-voltage line buckling factor
k c =
l c /
R c =4.
The buckling factor of high voltage distribution network transformer station power circuit
K f With the inversely proportional relation of the quantity of 220kV transformer station, under the known condition of calculating parameter, still can adopt in theory formula (2) to find the solution.But be convenience of calculation, do not consider the situation of change of 220kV transformer station quantity herein, suppose that namely the buckling factor of saturation loading year power circuit is with consistent when the year before last, namely
K f =1.6,
d k =1.
According to the regulation in " distribution network planning designing technique guide rule ", rural area (D class) farthest load point should not surpass 15km to the line length of bus end, namely
l f =15km.By finding the solution formula (2) as can be known, the radius of electricity supply in saturated year
R f =5.95km.Carry it into formula (3), as can be known the average annual rate of descent of radius of electricity supply
d r =0.9923.
1, example calculation
Suppose this province's rural area load average growth rate per annum in depreciation period
tBe 8%, the two schemes economy is compared as follows:
1) scheme one
According to formula (5), can get depreciation end of term transformer substation construction expense
W c1
=45,810 ten thousand yuan; According to formula (6) and formula (7), can get the electric energy loss expense of depreciation end of term power circuit
W l1
=376 ten thousand yuan; The wear and tear expense of transformer
W t1
=157 ten thousand yuan, the operation total cost
W p1
=
W l1
+
W t1
=533 ten thousand yuan.
2) scheme two
Consider power supply capacity, 35kV transformer station has configured two main transformers.Suppose that two main transformers move simultaneously, according to formula (5) ~ (7), can get depreciation end of term transformer substation construction expense
W c2
=26,796 ten thousand yuan; The power circuit wear and tear expense
W l2
=4,819 ten thousand yuan, the transformer loss expense
W t2
=384 ten thousand yuan, the operation total cost
W p2
=5,203 ten thousand yuan.
3) scheme relatively
By result of calculation as can be known, the total cost of scheme one is ten thousand yuan of 533+45810=46343; The total cost of scheme two is ten thousand yuan of 5203+26796=31999.Therefore, with regard to the load density of present this province's electrical network, be fit to take the Voltage Class of 35/10kV.
2, sensitivity analysis
1) load density sensitivity analysis
For the sensitivity relation of analyzing total expense to load density, with load density
ρWith 1kw/km
2Be step-length, from 25kw/km
2Be increased to 60kw/km
2, analytic curve as shown in Figure 2.As seen from the figure, as load density 〉=51.97kW/km
2The time, the expense of scheme two will be above scheme one, shows to cancel the 35kV electric pressure this moment, and it is comparatively economical adopting the 110kV power supply.Otherwise, only have when 35kV transformer station power supply capacity is not enough, just be fit to adopt the Voltage Class of 110/10kV.In other words, by the Growth Rate Calculation of load average annual 8%, the 35kV electric pressure can be cancelled in this province rural area after 9.12.
2) load growth rate sensitivity analysis
For analyzing the critical point of cancellation 35kV under the different load growth rate, Fig. 3 has provided the sensitivity curve of critical point place load density with the load average growth rate per annum.As seen from the figure, if load can guarantee to the depreciation end of term by 13% speed increment, then equal 25kw/km in load density
2The time, namely just can cancel the 35kV electric pressure then.
Claims (1)
1. rural area high voltage distribution network Voltage Class system of selection, it is characterized in that, under the condition of described method consideration interior radius of electricity supply of depreciation period and load variations, calculate construction and operating cost under the different schemes, thereby electric pressure selection scheme economy is compared evaluation, and described method comprises:
(1) adopt saturated year radius of electricity supply computational methods of new load to determine radius of electricity supply, the radius of electricity supply of loading saturated year
R f Can be determined by following equation:
Wherein,
k c Be the buckling factor when the circuit the year before last;
R c Be the radius of electricity supply when the year before last;
m c For working as the power supply number the year before last;
l f Be the saturated year nose road length of loading;
R f Be the radius of electricity supply of loading saturated year;
m f Be the saturated year power supply number of loading; When
k f Buckling factor for the saturated year circuit of loading; Power supply number when the year before last
m c , buckling factor
k c And line length
l c , the saturated year nose of load road length
l f During for given value, can ask
k f ,
m f With
R f Unknown quantity is determined the unique solution of target year radius of electricity supply;
(2) consider the factor that the construction cost of depreciation period power circuit can reduce along with the reduction of radius of electricity supply, calculate the transformer substation construction expense:
The somewhere needs
yArrive saturated year of load year, then the average annual rate of descent of radius of electricity supply and buckling factor is respectively:
Wherein:
RBe radius of electricity supply;
KBuckling factor for power circuit;
d r With
d k Be respectively the average annual rate of descent of radius of electricity supply and buckling factor; Subscript
fWith
cRepresentative was loaded saturated year and is worked as the year before last respectively;
yFor arriving the year number of degrees in saturated year of load;
Depreciation end of term transformer substation construction expense
W c Calculation expression be:
W c =
Wherein,
X t With
X l Be respectively the construction cost of transformer station's converting equipment and unit length power circuit;
L c For the power circuit length of building (comprises the stand-by power supply circuit
L b Interior);
iBe bank's Annual Percentage Rate;
nBe the depreciation time limit;
(3) after the Annual Percentage Rate of the average annual rate of change of taking into account the average growth rate per annum of load, radius of electricity supply and operating cost, the electric energy loss cost value of computing depreciation end of term power circuit wear and tear expense and transformer:
Wherein:
W l With
W t Be respectively the wear and tear expense of power circuit wear and tear expense and transformer; Integration variable
xBe year;
ρLoad density for the area;
The
xThe radius of electricity supply in year;
tAnnual growth for load;
Be
xThe burden with power in year;
r 0Resistance per unit length for power circuit;
LFor transformer station under the normal operating mode be subjected to electric line length, its value equals power circuit length
L c Deduct the stand-by power supply line length
L b 
Be
xYear, transformer station was subjected to the length of electric line;
φBe power-factor angle;
VBe the transforming plant main transformer high side voltage;
T MaxBe regional number of working hours based on maximum load;
cBe electricity price;
r t Short-circuit resistance for transformer;
(4) according to the construction cost under the different Voltage Class selection schemes and electric energy loss expense, carry out economy relatively and evaluation.
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| CN105046589A (en) * | 2015-08-19 | 2015-11-11 | 国家电网公司 | Method for obtaining economic index of power supply network of super-high-rise building |
| CN109888789A (en) * | 2019-03-08 | 2019-06-14 | 国网陕西省电力公司 | A kind of high voltage substation power supply capacity calculation method |
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| CN106487012B (en) * | 2016-11-30 | 2019-02-22 | 云南电网有限责任公司 | A kind of selection method and system of high voltage distribution network powering mode |
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