CN102437578B - Power supply mode selection method of area without electricity supply based on load distance and load characteristic - Google Patents

Power supply mode selection method of area without electricity supply based on load distance and load characteristic Download PDF

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CN102437578B
CN102437578B CN201110310966.1A CN201110310966A CN102437578B CN 102437578 B CN102437578 B CN 102437578B CN 201110310966 A CN201110310966 A CN 201110310966A CN 102437578 B CN102437578 B CN 102437578B
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electricity
load
powering mode
areas
power supply
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CN102437578A (en
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韦涛
陈海
张祖平
苏剑
吕政�
郭顺宁
刘庆彪
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QINGHAI ELECTRIC POWER CO Ltd
China Electric Power Research Institute Co Ltd CEPRI
State Grid Qinghai Electric Power Co Ltd
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QINGHAI ELECTRIC POWER CO Ltd
China Electric Power Research Institute Co Ltd CEPRI
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Abstract

The invention relates to a power supply mode selection method of an area without electricity supply based on a load distance and a load characteristic. Based on a survey of a present situation of the area without electricity supply, an appropriate power supply mode is provided. Each mode lists each characteristics and a suitable scope. The method is characterized by: measuring and calculating load and line power supply distances of the area without electricity supply; calculating and determining whether the distances satisfy a load distance requirement; determining the corresponding power supply mode according to the load and the load characteristic. By using the method, a set of selection process of the power supply modes of the area without electricity supply can be established. A selection difficulty of the power supply modes of the area without electricity supply can be substantially reduced. A feasible scientific technology which can solve a power supply problem of the area without electricity supply can be provided. In the invention, the method is combined with the actual area without electricity supply. The area without electricity supply and a power distribution network of the adjacent power supply area can be deeply analyzed. A bottleneck of implementing power grid extension power supply can be found and a power supply problem of the area without electricity supply can be effectively solved.

Description

A kind of areas without electricity powering mode system of selection based on load distance and part throttle characteristics
Technical field:
The present invention relates to distribution network planning field, a kind of areas without electricity powering mode system of selection based on load distance and part throttle characteristics of specific design.
Background technology:
At present, remote at some, have inconvenient traffic, agriculture and animal husbandry area, plateau that sparsely populated ethnic group lives in concentrated communities, its electrical problem is not solved so far at all, part village (herding) people that distance electrical network is far away, is not still energized so far.On the other hand, due to NGO in recent years Ecological Immigration, adjust village engineering and town development, increase newly again a part of without electric family; Some agriculture and animal husbandry families originally powered with the solar photovoltaic power energy, facility to be powered defines new for electric family again after scrapping.Many areas, in order to solve the powerup issue of non-Electric region, are implemented electrical network blindly and are extended power supply, both caused a large amount of power grid construction investment waste, and failed again effectively to ensure quality of voltage, fundamentally do not solve the powerup issue of areas without electricity.
For Qinghai, at present, Qinghai except four counties of district three belonging to Xining and Haidong Prefecture's safety, Ledu, the people and, help each other four outside the county, all the other areas all exist in various degree without electrical phenomena, without electric, that short of electricity problem seriously governs farming and pastoral area, Qinghai economic society development.According to statistics, up to now, all areas without electricity in Qinghai relate to 101486 families altogether, 445580 people.
The powerup issue of these vast areas without electricity above-mentioned, main electrical network extension or the family photovoltaic powering mode of relying on temporarily solves electrical problem at present, but, the blindness that existing solution ubiquity is larger, all the time a kind of powering mode selection approach of science is lacked, this will be the significant bottleneck seriously restricting areas without electricity powerup issue, urgently invents a kind of science, reasonable, workable method, effectively solves the powerup issue of areas without electricity.
Summary of the invention:
For the deficiency of above-mentioned technology, the invention provides a kind of areas without electricity powering mode system of selection based on load distance and part throttle characteristics, the method is applicable to the areas without electricity within the scope of farming and pastoral area, plateau, and suitable powering mode can be selected according to the different characteristic of self in each department.
A kind of areas without electricity powering mode system of selection based on load distance and part throttle characteristics provided by the invention, its improvements are, described method comprises the steps:
(1) investigate and record the present situation of areas without electricity;
(2) feature and the scope of application of the powering mode of described areas without electricity is studied;
(3) calculate described areas without electricity load, line powering distance, and obtain load distance;
(4) number of users is calculated;
(5) radius of electricity supply is calculated;
(6) judge that the energy is complementary;
(7) described areas without electricity powering mode is determined according to described step (3) ~ step (6).
The areas without electricity powering mode system of selection of the first preferred version provided by the invention, its improvements are, described investigation the present situation recording areas without electricity comprises record powering area and part throttle characteristics.
The areas without electricity powering mode system of selection of the second preferred version provided by the invention, its improvements are, described powering mode comprises electrical network and extends the complementary powering mode of powering mode, photovoltaic plant centrally connected power supply pattern, user's photovoltaic decentralized power supply pattern and the energy.
The areas without electricity powering mode system of selection of the 3rd preferred version provided by the invention, its improvements are, described line powering distance is the power supply distance of different electric pressure supply line, and computing formula comprises:
35kV, 110kV power distribution network:
l 1,2 = 3 I ( r · cos φ + x · sin φ ) ± 3 I 2 ( r · cos φ + x · sin φ ) 2 - 2 Ubx · ΔU Ubx
10kV and following power distribution network: l = 3 2 ΔU I · ( r · cos φ + x · sin φ ) .
The areas without electricity powering mode system of selection of the 4th preferred version provided by the invention, its improvements are, described load distance is the product of described load and described line powering distance.
The areas without electricity powering mode system of selection of more preferably scheme provided by the invention, its improvements are, selecting described electrical network to extend powering mode need meet: the described load distance that step (3) calculates meets load distance standard.
The areas without electricity powering mode system of selection of another preferred version provided by the invention, its improvements are, select user's photovoltaic power supply pattern to meet:
A described load distance that () step (3) calculates does not meet load distance standard, and the quantity of step (4) described number of users is less than 20 families; Or
B described load distance that () step (3) calculates does not meet load distance standard, the quantity of step (4) described number of users is greater than 20 families and radius of electricity supply be greater than 1500 meters but user not at 1500 meters of radiuses with inner region.
The areas without electricity powering mode system of selection of a preferred version more provided by the invention, its improvements are, selective light overhead utility powering mode need meet:
1. the described load distance that step (3) calculates does not meet load distance standard, the quantity of step (4) described number of users is greater than 20 families, radius of electricity supply is greater than 1500 meters and user at 1500 meters of radiuses with inner region; Or
2. the described load distance that step (3) calculates does not meet load distance standard, the quantity of step (4) described number of users is greater than 20 families, radius of electricity supply is not more than 1500 meters and energy complementarity is poor.
The areas without electricity powering mode system of selection of a preferred version more provided by the invention, its improvements are, select the complementary powering mode of the energy to meet: the described load distance that step (3) calculates does not meet load distance standard, the quantity of step (4) described number of users is greater than 20 families, radius of electricity supply is not more than 1500 meters and the energy is better complementary.
Compared with the prior art, beneficial effect of the present invention is:
(1) for solving areas without electricity powerup issue, the powering mode that choose reasonable is suitable for provides science, feasible quantification means.
(2) by calculated load distance, analysis load characteristic, can as the effective criterion selecting powering mode; The powering mode setting up complete set selects flow process, and the power construction for areas without electricity provides important reference frame, largely overcomes blindness and randomness that areas without electricity powers.
(3) combine with actual areas without electricity, be convenient to analyse in depth areas without electricity and adjacent power supply area power distribution network, find out and implement the bottleneck that electrical network extends power supply existence, and other supply power modes set up except electrical network extends powering mode, emphasis proposes the power supply plan having operability from network configuration aspect, effectively solve the powerup issue of areas without electricity.
(4) present invention saves power grid construction investment resources, and effectively ensure quality of voltage.
(5) the present invention is a kind of science, reasonable, workable method, for later power distribution network cause brings positive meaning.
Accompanying drawing explanation
Fig. 1 is that electrical network provided by the invention extends powering mode schematic diagram.
Fig. 2 is photovoltaic plant centrally connected power supply pattern diagram provided by the invention.
Fig. 3 is family provided by the invention photovoltaic decentralized power supply pattern diagram.
Fig. 4 is the complementary powering mode schematic diagram of the energy provided by the invention.
Fig. 5 is that areas without electricity powering mode provided by the invention selects flow chart.
Embodiment
Below in conjunction with accompanying drawing, the specific embodiment of the present invention is described in further detail.
The present embodiment is remote for those, have inconvenient traffic, areas without electricity that sparsely populated ethnic group lives in concentrated communities, solves its powerup issue, will select the powering mode be suitable for exactly.The juche idea of the present embodiment is on the basis of investigation areas without electricity present situation, propose several suitable powering mode, respective characteristics and available field is all listed for often kind of pattern, namely mainly through measuring and calculating areas without electricity load, line powering distance, calculate and judge whether it meets load distance requirement, and determining corresponding powering mode according to load number, load characteristic.
Concrete, the method flow of the present embodiment as shown in Figure 5, specifically comprises the steps:
(1) investigate and record the present situation of areas without electricity.Comprise the powering area of areas without electricity, population and part throttle characteristics etc.
(2) feature and the scope of application of the powering mode of described areas without electricity is studied.
The powering mode of areas without electricity generally comprises electrical network and extends the complementary powering mode (as shown in Figure 4) of powering mode (as shown in Figure 1), photovoltaic plant centrally connected power supply pattern (as shown in Figure 2), user's photovoltaic power supply pattern (as shown in Figure 3) and the energy.The complementary powering mode of the energy is the complementary powering mode of various energy resources, comprises wind-force, waterpower, solar energy, diesel generation etc.The feature of its each pattern, the condition that need meet and the scope of application are respectively:
(I) electrical network extends the feature of powering mode is extension construction by adopting 10kV or 0.4kV utility network, for Add User or without electric customer power supply.Select described electrical network to extend powering mode need meet: the load distance calculated meets load distance standard.Its scope of application: electrical network normal power supply scope.
(II) feature of user's photovoltaic power supply pattern is low for the density of population, the area that power load is extremely disperseed, and adopts the mode of unique user installing photovoltaic battery panel to solve the pattern of powerup issue.User's photovoltaic power supply pattern is selected to meet:
A described load distance that () calculates does not meet load distance standard, and the quantity of number of users is less than 20 families; Or
B described load distance that () calculates does not meet load distance standard, the quantity of number of users is greater than 20 families and radius of electricity supply be greater than certain user in 1500 meters but 20 families not at 1500 meters of radiuses with inner region.
Its scope of application: the farming and pastoral area user of load relative distribution.
(III) feature of photovoltaic plant powering mode: load point distance power supply point is far away, exceed reasonable power supply distance, do not possess a large amount of unique users of mains supply, or each scatteredload point is each other apart from not far, can form the power load of one or several compact community.For the ease of management, multiple peasants and herdsmen families composition of living near is assembled village, by a kind of pattern of the unified power supply of photovoltaic plant.Selective light overhead utility powering mode need meet:
1. the described load distance calculated does not meet load distance standard, the quantity of number of users is greater than 20 families, radius of electricity supply is greater than 1500 meters and user at 1500 meters of radiuses with inner region; Or
2. the described load distance calculated does not meet load distance standard, the quantity of number of users is greater than 20 families, radius of electricity supply is not more than 1500 meters and energy complementarity is poor.Wherein the energy is complementary poor refers to that several energy supply such as------wind-force, waterpower, solar energy, diesel engine generator is not enough, can not form complementation each other.
Its scope of application: the school of load Relatively centralized, temple, the region such as local government and villagers' committee.
(IV) feature of the complementary powering mode of the energy: wind power generation, solar energy power generating, hydroelectric power generation, diesel engine generator are powered " etc. the complementary powering mode of various energy resources form.The complementary powering mode of the energy is selected to meet: the described load distance calculated does not meet load distance standard, the quantity of number of users is greater than 20 families, radius of electricity supply is not more than 1500 meters and the energy is better complementary.
Its scope of application: the school of load Relatively centralized, temple, the region such as local government and villagers' committee; The region that wind energy, solar energy, water resources etc. are complementary stronger.
(3) calculate described areas without electricity load, line powering distance, and obtain load distance.
The load of areas without electricity is tried to achieve according to the electricity capacity of user and electricity consumption multiplication;
The power supply distance of supply line must meet the requirement of voltage drop, and computing formula comprises:
35kV, 110kV power distribution network:
l 1,2 = 3 I ( r · cos φ + x · sin φ ) ± 3 I 2 ( r · cos φ + x · sin φ ) 2 - 2 Ubx · ΔU Ubx
10kV and following power distribution network: l = 3 2 ΔU I · ( r · cos φ + x · sin φ ) .
L 1corresponding 35KV power distribution network, l 2corresponding 110KV power distribution network; Ub is line voltage distribution; φ is power-factor angle.Equivalent resistance and reactance
Equivalent resistance R eqsize relevant with the distribution situation of load on circuit, calculating shows:
I), in 35kV, 110kV power distribution network, be similar to the line end thinking that load is concentrated, equivalent resistance (reactance) is maximum, now R eqi=R li, X eqi=X li
Ii) in 10kV and following power distribution network, approximately think that load is uniformly distributed along circuit, equivalent resistance (reactance) is: R eqi = 2 3 R li , X eqi = 2 3 X li
Wherein: R li=rl, X li=xl, r are the resistance value of unit length; X is the reactance value of unit length; L is line powering distance.
Voltage drop
Q＝Q L-Q C
Wherein: P is active power; Q is reactive power; Q lfor the transmission power on circuit; Q cfor circuit natural power; for power-factor angle.
When the power that circuit is carried exceedes natural power, the reactive power that the reactive power absorbed in unit length inductance will be greater than capacitance per unit length and releases, there is idle deficiency in circuit, so that causes the voltage of circuit end to reduce; Conversely, when the power carried is less than natural power, the reactive power that the reactive power absorbed in circuit unit length inductance will be less than capacitance per unit length and releases, idle residue will be there is in circuit, and unnecessary capacitive reactive power by line inductance time, line end voltage will be caused to raise.
According to standard regulation, the working voltage of long-distance transmission line, does not generally allow and exceedes 10% of circuit rated voltage, if terminal voltage is too high during zero load, just needs installing shunt reactor with Absorption Capacitance charge power, reduces voltage.
Ask load distance, be the product of load and line powering distance.
According to above-mentioned Research Thinking, determine 110kV and require as shown in the table with the load distance of line (standard scale):
According to the actual load that obtains and line powering distance, try to achieve actual load distance, then form is like this compared.
(4) number of users is calculated.
(5) radius of electricity supply is calculated.
(6) judge that the energy is complementary.(energy distribution situation according to locality makes a decision.)
(7) described areas without electricity powering mode is determined according to described step (3) ~ step (6), specific as follows:
Judge whether the load distance calculated meets the load distance standard of areas without electricity;
If meet load distance standard, then electrical network is adopted to extend powering mode;
If do not meet load distance, judge whether number of users is greater than 20, if be less than 20 families, then adopt family photovoltaic powering mode;
If be greater than 20 families, judge whether its radius of electricity supply is greater than 1500 meters, if be greater than 1500 meters, judge user in 20 families whether at 1500 meters of radiuses with inner region, be adopt photovoltaic plant powering mode, be not, adopt family photovoltaic powering mode;
If radius of electricity supply is less than 1500 meters, then judge that whether its energy complementarity is comparatively strong, if complementarity is comparatively strong, then adopt energy powering mode; If complementarity is not strong, then adopt photovoltaic plant powering mode.
Show that the alternative condition of areas without electricity powering mode is as shown in the table at this point
Finally should be noted that: only illustrate that technical scheme of the present invention is not intended to limit in conjunction with above-described embodiment.Those of ordinary skill in the field are to be understood that: those skilled in the art can modify to the specific embodiment of the present invention or equivalent replacement, but these amendments or change are all being applied among the claims awaited the reply.

Claims (4)

1., based on an areas without electricity powering mode system of selection for load distance and part throttle characteristics, it is characterized in that, described method comprises the steps:
(1) investigate and record the present situation of areas without electricity;
(2) feature and the scope of application of the powering mode of described areas without electricity is studied;
(3) calculate described areas without electricity load, line powering distance, and obtain load distance;
(4) number of users is calculated;
(5) radius of electricity supply is calculated;
(6) judge that the energy is complementary;
(7) described areas without electricity powering mode is determined according to described step (3) ~ step (6);
Described powering mode comprises electrical network and extends the complementary powering mode of powering mode, photovoltaic plant centrally connected power supply pattern, user's photovoltaic decentralized power supply pattern and the energy;
Select described electrical network to extend powering mode need meet: the described load distance that step (3) calculates meets load distance standard;
User's photovoltaic power supply pattern is selected to meet:
A described load distance that () step (3) calculates does not meet load distance standard, and the quantity of step (4) described number of users is less than 20 families; Or
B described load distance that () step (3) calculates does not meet load distance standard, the quantity of step (4) described number of users is greater than 20 families and radius of electricity supply be greater than 1500 meters but user not at 1500 meters of radiuses with inner region;
Selective light overhead utility powering mode need meet:
1. the described load distance that step (3) calculates does not meet load distance standard, the quantity of step (4) described number of users is greater than 20 families, radius of electricity supply is greater than 1500 meters and user at 1500 meters of radiuses with inner region; Or
2. the described load distance that step (3) calculates does not meet load distance standard, the quantity of step (4) described number of users is greater than 20 families, radius of electricity supply is not more than 1500 meters and energy complementarity is poor;
The complementary powering mode of the energy is selected to meet: the described load distance that step (3) calculates does not meet load distance standard, the quantity of step (4) described number of users is greater than 20 families, radius of electricity supply is not more than 1500 meters and the energy is better complementary.
2. areas without electricity powering mode system of selection as claimed in claim 1, is characterized in that, described investigation the present situation recording areas without electricity comprises record powering area and part throttle characteristics.
3. areas without electricity powering mode system of selection as claimed in claim 1, is characterized in that, described line powering distance computing formula comprises:
35kV, 110kV power distribution network:
l 1,2 = 3 I ( r · cos φ + x · sin φ ) ± 3 I 2 ( r · cos φ + x · sin φ ) 2 - 2 Ubx · ΔU Ubx
10kV and following power distribution network: l = 3 2 ΔU I · ( r · cos φ + x · sin φ ) ;
In formula, r is the resistance value of unit length; X is the reactance value of unit length; for power-factor angle; Ub is line voltage distribution; Δ U is voltage difference; I is electric current.
4. areas without electricity powering mode system of selection as claimed in claim 1, it is characterized in that, described load distance is the product of described load and described line powering distance.
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CN105656029B (en) * 2016-01-26 2018-08-17 国网山东省电力公司青岛供电公司 A kind of super radius of electricity supply of low-voltage power supply taiwan area load point determines method and device
CN108183470A (en) * 2017-11-22 2018-06-19 国家电网公司 The method of power distribution network low-voltage diagnosis
CN116915690B (en) * 2023-09-14 2023-12-12 国网江苏省电力有限公司徐州供电分公司 Power distribution line transmission efficiency evaluation method and system of passive tree topology

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