CN105205622A - Planning method for transformer substations and distributed generation distribution points - Google Patents
Planning method for transformer substations and distributed generation distribution points Download PDFInfo
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- CN105205622A CN105205622A CN201510708514.7A CN201510708514A CN105205622A CN 105205622 A CN105205622 A CN 105205622A CN 201510708514 A CN201510708514 A CN 201510708514A CN 105205622 A CN105205622 A CN 105205622A
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- transformer station
- distributed power
- power generation
- transformer
- transformer substations
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y04—INFORMATION OR COMMUNICATION TECHNOLOGIES HAVING AN IMPACT ON OTHER TECHNOLOGY AREAS
- Y04S—SYSTEMS INTEGRATING TECHNOLOGIES RELATED TO POWER NETWORK OPERATION, COMMUNICATION OR INFORMATION TECHNOLOGIES FOR IMPROVING THE ELECTRICAL POWER GENERATION, TRANSMISSION, DISTRIBUTION, MANAGEMENT OR USAGE, i.e. SMART GRIDS
- Y04S10/00—Systems supporting electrical power generation, transmission or distribution
- Y04S10/50—Systems or methods supporting the power network operation or management, involving a certain degree of interaction with the load-side end user applications
Abstract
The invention discloses a planning method for transformer substations and distributed generation distribution points. The method comprises steps sequentially as follows: inputting loads and data of to be selected substation addresses; initializing group coding; determining the number of load points and transformer substations connected with distributed generation; judging whether important load points are all provided with distributed generation or not; judging whether the number of the transformer substations is suitable or not; judging whether the constraint on power supply distance of the transformer substations is met or not; calculating an objective function value; judging whether a stopping criterion for iteration is met or not; outputting a planning scheme for the transformer substations and distributed generation. During the planning of the transformer substations, the planning of distributed generation distribution points is added, so that the problems that the transformer substation is more complicated, more constraint conditions need to be considered, and solutions are more difficult are solved, the receptivity of a power distribution network for renewable energy sources is improved, the use ratio of power distribution network assets is increased, the investment in upgrading of the power distribution network is delayed, and the electricity utilization quality and electricity supply reliability for users are improved.
Description
Technical field
The present invention relates to a kind of substation location planing method, specifically a kind of transformer station and the distributed power generation planing method of layouting.
Background technology
Investment of substations occupies remarkable proportion in urban power distribution network gross investment.According to statistics, investment of substations reaches more than 60% of power distribution network gross investment usually, and its operation and maintenance cost exceedes 20% of power distribution network operation and maintenance cost.Therefore, substation planning enjoys industry to pay close attention to always.After adding distributed power generation, substation planning will become more complicated, need the constraint condition considered to increase, solve also more difficult.
Summary of the invention
The present invention is exactly to solve the problems of the prior art, and provides the planing method that a kind of transformer station and distributed power generation are layouted.
The present invention realizes according to following technical scheme:
The planing method that transformer station and distributed power generation are layouted, concrete steps are:
First step, input load and site to be selected data;
Second step, determines the plan model that transformer station and distributed power generation are layouted, determines objective function and constraint condition, and initial population is encoded;
Third step, determines load point that distributed power generation connects and transformer station's number;
4th step, judges whether that important load point all has distributed power generation; Satisfy condition, be then decoded into transformer station and distributed power generation sensor distributing;
5th step, judges that whether transformer station's number is suitable; Satisfy condition, then divide service area by Voronoi figure (Thiessen polygon figure);
6th step, judges whether to meet transformer station's power supply distance constraint; Satisfy condition, then determine transforming plant main transformer capacity and number of units;
7th step, calculating target function value;
8th step, judges whether to meet stopping criterion for iteration; Satisfy condition, then export transformer station and distributed generation planning scheme.
The advantage that the present invention has and good effect are:
The present invention is in the planning of transformer station, add distributed power generation to layout planning, solve the constraint condition that substation planning is more complicated, needs are considered increase and solve more difficult problem, strengthen the receiving ability of power distribution network for regenerative resource, promote the utilization factor of power distribution network assets, delay the upgrading investment of power distribution network and improve power quality and the power supply reliability of user.
Accompanying drawing explanation
Fig. 1 is the FB(flow block) of the planing method that a kind of transformer station and distributed power generation are layouted;
Fig. 2 is 29 node power distribution net example figure of the present invention;
Fig. 3 is power distribution network substation site selection of the present invention and space truss project distribution of results figure.
Embodiment
Below in conjunction with drawings and Examples, the present invention will be described in detail.
As shown in Figure 1, the planing method that transformer station of the present invention and distributed power generation are layouted, concrete steps are:
First step, input load and site to be selected data; In the present embodiment, with 29 node power distribution net examples shown in Fig. 2, have 28 load point and 3 transformer stations treat addressing, distributed power generation only considers wind-power electricity generation, its load point parameter is as shown in the correlation parameter of following table 1 node load, transformer station to be selected is 35kV transformer station, and particular location parameter such as table 2 transformer station treats shown in the correlation parameter of addressing.
The correlation parameter of table 1 node load
Table 2 transformer station treats the correlation parameter of addressing
Second step, determines the plan model that transformer station and distributed power generation are layouted, determines objective function and constraint condition, and initial population is encoded.
In the present embodiment, determine that objective function is that transformer substation construction runs year cost, line construction operation year cost, distributed power source Construction and operation year cost, conventional energy resources saving income and environmental benefit as objective function:
Wherein,
In formula,
c sub ,
c dG ,
c line ,
c en ,
c e be respectively conversion to the investment of annual investment of substations and operating cost, distributed power source and operating cost, track investment, environmental benefit;
nfor the quantity of newly-built transformer station,
n dG for the total quantity of distributed power source,
n q for the quantity of considered greenhouse gases;
for investment of substations function;
be
ithe capacity of seat transformer station;
for annual cost conversion factor;
for transformer station's year operation and maintenance cost function;
for the number of newly-built distributed power source;
be
ithe fixed investment Average Annual Cost coefficient of individual distributed power source;
c dGi be
ithe fixed investment expense of individual distributed power source;
be
ithe year maintenance of individual distributed power source, maintenance cost;
for by transformer station
ithe load aggregation of power supply;
for load bus
jto the line length of corresponding transformer station;
for the investment of circuit unit length;
be
iclass distributed power source instead of the emission factor (kg/kWh) of the greenhouse gases that heat power station is built;
for the discharge price (unit/kg) of greenhouse gases;
be
ithe annual electricity generating capacity (kWh/y) of individual distributed power source;
p co for unit thermoelectricity cost (unit/kWh).
In the present embodiment, the quantity of the greenhouse gases considered
n q be 4,
be 0.08,
, wherein
c sub if being the unit construction cost of transformer station is 8000 yuan/kWh;
,
for the organizational maintenance cost coefficient of transformer station, be set to 0.05 yuan/kWh; The fixed investment Average Annual Cost coefficient of distributed power source
all get 0.08,
,
s dGi be the capacity of i-th distributed power source,
be the unit construction cost of i-th distributed power source, get 8000 yuan/kWh; The
ithe year maintenance of individual distributed power source, maintenance cost
,
be the unit maintenance of i-th distributed power source, maintenance cost, be set to 0.05 yuan/kWh; Circuit unit length is invested
value reference table 3LGJ-185 line parameter circuit value; The greenhouse gases considered and emission factor and discharge price as shown in following table 4 thermal power generation disposal of pollutants data,
p co be taken as 0.35 yuan/kWh.
Table 3LGJ-185 line parameter circuit value
Table 4 thermal power generation disposal of pollutants data
In the present embodiment, the constraint condition of consideration is following 7 aspects:
1) node voltage constraint
In formula,
,
be respectively node voltage
lower limit and the upper limit;
for the level of confidence that node voltage is out-of-limit;
for active distribution network node set; In the present embodiment, example is a 10kV distribution network, determines that its voltage bound is respectively 1.07p.u. and 0.9p.u..
2) circuit transmission power constraint
for passing through branch road
applied power,
for branch road
capacity limitation,
for the level of confidence that Branch Power Flow is out-of-limit, this constraint condition ensures that the trend on branch road can meet the constraint of thermal capacity.In the present embodiment, the parameter information of circuit LGJ-185 to be selected is as table 5.
3) node power Constraints of Equilibrium
In formula,
with
represent respectively with node
for all sets of lines of starting point and terminal,
with
represent circuit respectively
upper forward and reverse trend,
for node power meets the level of confidence of Constraints of Equilibrium.
4) radial networks constraint
In formula,
for the nodes that planning level year active distribution network is total,
for all branches number sum.
5) DG capacity-constrained
In formula,
for important load aggregation;
for the permeability of DG.In the present embodiment, setting permeability is 0.3.
6) DG constraint must be connect near important load point, in the present embodiment, significance level assessment is more than or equal to the load point of 0.9 as important load point.
Adopt genetic algorithm to generate initial solution simultaneously.
Third step, determines load point that distributed power generation connects and transformer station's number.
4th step, judges whether that important load point all has distributed power generation; Satisfy condition, be then decoded into transformer station and distributed power generation sensor distributing.
5th step, judges that whether transformer station's number is suitable; Satisfy condition, then by Voronoi diagram root service area.
6th step, judges whether to meet transformer station's power supply distance constraint; Satisfy condition, then determine transforming plant main transformer capacity and number of units.
In the present embodiment, the maximum power supply distance of setting transformer station is 5km.
7th step, calculating target function value.
8th step, judges whether to meet stopping criterion for iteration; Satisfy condition, then export transformer station and distributed generation planning scheme.
In the present embodiment, using genetic algorithm iteration 500 times as stopping criterion for iteration; Finally obtain following result: the program results that the planing method that the transformer station proposed according to the present invention and distributed power generation are layouted obtains is, 1 35kV transformer station is set up at G1 place, capacity is 5000kVA, and as shown in Figure 3, the configuring condition of distributed power generation is as shown in table 5 for space truss project.
Table 5 distributed power source arrangement
In the 4th described step, if the generating of important load point distribution-free formula, then increase distributed power generation at the important load point not containing distributed power generation, then carry out being decoded into transformer station and distributed power generation sensor distributing.
In the 5th described step, if transformer station's number is improper, then adjust transformer station's number, and then by Voronoi diagram root service area.
In the 6th described step, if cannot meet transformer station's power supply distance constraint, then additional penalty item, then determines transforming plant main transformer capacity and number of units.
In the 8th described step, if cannot stopping criterion for iteration be met, then carry out genetic manipulation, then return third step, again determine load point that distributed power generation connects and transformer station's number.
The present invention is in the planning of transformer station, add distributed power generation to layout planning, solve the constraint condition that substation planning is more complicated, needs are considered increase and solve more difficult problem, strengthen the receiving ability of power distribution network for regenerative resource, promote the utilization factor of power distribution network assets, delay the upgrading investment of power distribution network and improve power quality and the power supply reliability of user.
Claims (5)
1. a transformer station and distributed power generation planing method of layouting, concrete steps are:
First step, input load and site to be selected data;
Second step, determines the plan model that transformer station and distributed power generation are layouted, determines objective function and constraint condition, and initial population is encoded;
Third step, determines load point that distributed power generation connects and transformer station's number;
4th step, judges whether that important load point all has distributed power generation; Satisfy condition, be then decoded into transformer station and distributed power generation sensor distributing;
5th step, judges that whether transformer station's number is suitable; Satisfy condition, then by Voronoi diagram root service area;
6th step, judges whether to meet transformer station's power supply distance constraint; Satisfy condition, then determine transforming plant main transformer capacity and number of units;
7th step, calculating target function value;
8th step, judges whether to meet stopping criterion for iteration; Satisfy condition, then export transformer station and distributed generation planning scheme.
2. transformer station according to claim 1 and the distributed power generation planing method of layouting, it is characterized in that: when in the 4th step, if important load point distribution-free formula generates electricity, then increase distributed power generation at the important load point not containing distributed power generation, then carry out being decoded into transformer station and distributed power generation sensor distributing.
3. transformer station according to claim 1 and the distributed power generation planing method of layouting, is characterized in that: when in the 5th step, if transformer station's number is improper, then adjust transformer station's number, and then by Voronoi diagram root service area.
4. transformer station according to claim 1 and the distributed power generation planing method of layouting, is characterized in that: when in the 6th step, if cannot meet transformer station's power supply distance constraint, then additional penalty item, then determines transforming plant main transformer capacity and number of units.
5. transformer station according to claim 1 and the distributed power generation planing method of layouting, it is characterized in that: when in the 8th step, if cannot stopping criterion for iteration be met, then carry out genetic manipulation, then return third step, again determine load point that distributed power generation connects and transformer station's number.
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107147111A (en) * | 2017-05-19 | 2017-09-08 | 上海电力设计院有限公司 | The distribution power automation terminal points distributing method analyzed based on power supply reliability |
| CN109031041A (en) * | 2018-07-06 | 2018-12-18 | 广州供电局有限公司 | Distribution network voltage monitoring device points distributing method and system |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103514570A (en) * | 2013-08-14 | 2014-01-15 | 国家电网公司 | Expansion planning comprehensive optimization method of power distribution network with distributed power supply |
| CN104268336A (en) * | 2014-09-24 | 2015-01-07 | 国网上海市电力公司 | DG-included power distribution network planning method based on Voronoi graph |
| JP2015125643A (en) * | 2013-12-26 | 2015-07-06 | 川崎重工業株式会社 | Facility planning method, program and device for distributed energy system |
-
2015
- 2015-10-28 CN CN201510708514.7A patent/CN105205622A/en active Pending
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103514570A (en) * | 2013-08-14 | 2014-01-15 | 国家电网公司 | Expansion planning comprehensive optimization method of power distribution network with distributed power supply |
| JP2015125643A (en) * | 2013-12-26 | 2015-07-06 | 川崎重工業株式会社 | Facility planning method, program and device for distributed energy system |
| CN104268336A (en) * | 2014-09-24 | 2015-01-07 | 国网上海市电力公司 | DG-included power distribution network planning method based on Voronoi graph |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107147111A (en) * | 2017-05-19 | 2017-09-08 | 上海电力设计院有限公司 | The distribution power automation terminal points distributing method analyzed based on power supply reliability |
| CN109031041A (en) * | 2018-07-06 | 2018-12-18 | 广州供电局有限公司 | Distribution network voltage monitoring device points distributing method and system |
| CN109031041B (en) * | 2018-07-06 | 2023-10-20 | 广东电网有限责任公司广州供电局 | Distribution network voltage monitoring device point distribution method and system |
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Application publication date: 20151230 |