CN112101654A - Optimization method and device for planning adaptability of power distribution network - Google Patents
Optimization method and device for planning adaptability of power distribution network Download PDFInfo
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- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
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- 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
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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
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- Y04S50/00—Market activities related to the operation of systems integrating technologies related to power network operation or related to communication or information technologies
- Y04S50/16—Energy services, e.g. dispersed generation or demand or load or energy savings aggregation
Abstract
The invention discloses a method and a device for optimizing the planning adaptability of a power distribution network, which comprises the following steps: the first step is as follows: constructing an active power distribution network planning system structure; the second step is that: the method comprises the steps of 1, analyzing the current situation of the active power distribution network, 1, analyzing the current situation of the distributed power supply, formulating an active power distribution network planning design system structure, researching an active power distribution network planning design method, including the current situation of the active power distribution network, load prediction, source network load integrated balance and other aspects, repeatedly formulating a network load collaborative planning scheme, finally providing an active power distribution network electrical verification method, considering the influence of distributed power supply access, giving full play to the function of the distributed power supply to the greatest extent, realizing optimal source and network asset efficiency, and providing planning design reference for power distribution network planning designers.
Description
Technical Field
The invention relates to the technical field of active power distribution network planning, in particular to a power distribution network planning adaptability optimizing method and device.
Background
Distributed power generation refers to the deployment of smaller generator sets (less than 50MW) near a customer to meet the electricity demand of a particular customer or to support the economic operation of an existing power distribution grid. These small units include fuel cells, micro gas turbines, photovoltaic power plants, rooftop photovoltaics, wind power generation, and the like. According to the strategic decision arrangement of the state in the new energy field, a large number of distributed power supplies are connected into a power distribution network in the foreseeable future, and the connection of the distributed power supplies into the power distribution network brings a series of positive influences of improving the power supply reliability, balancing the load, improving the disaster prevention level of the power distribution network, reducing the investment of a main network and the like, and also brings some technical problems of voltage regulation, relay protection, reclosing success rate, short-circuit current level and the like. The traditional power distribution network planning method cannot meet the planning requirement of distributed power supply access, and according to the 2009 international large power grid conference CIGRE definition, an Active Distribution Network (ADN) realizes comprehensive control of distributed energy (distributed power generation, flexible load and energy storage), and can flexibly use a network to realize effective management of power flow. At present, a great deal of research is carried out on the active power distribution network control key technology in China, but the more detailed active power distribution network planning technology with operability is rarely researched. Therefore, it is very urgent to realize the top-level design of the active power distribution network from the planning level and provide decision basis for planning technicians and enterprise managers.
Disclosure of Invention
The invention aims to provide a preferable method and a preferable device for planning adaptability of a power distribution network, and aims to solve the technical problems that the connection of a distributed power supply to the power distribution network in the background art brings a series of positive influences of improving power supply reliability, balancing load, improving disaster prevention level of the power distribution network, reducing investment of a main network and the like, and also brings about voltage regulation, relay protection, reclosing success rate, short-circuit current level and the like. The traditional power distribution network planning method cannot meet the planning requirement of distributed power supply access.
In order to achieve the purpose, the invention provides the following technical scheme: a preferable method for planning adaptability of a power distribution network comprises the following steps:
the first step is as follows: constructing an active power distribution network planning system structure;
the second step is that: the current situation analysis of the active power distribution network,
1. the status quo analysis of the distributed power supply,
2. analyzing the access bottleneck of the distributed power supply;
the third step: the load of the active power distribution network is predicted,
1. the load is classified into a load classification mode,
2. the load is predicted in a load prediction mode,
3. predicting the output of the distributed power supply;
the fourth step: the network load collaborative planning of the active power distribution network,
1. the access of the distributed power supply is realized,
2. the scheme of the transformer substation is formulated,
3. the medium-voltage power grid scheme is established,
4. electrical calculation;
the fifth step: selecting a certain newly-built economic development area to develop the calculation example application,
1. the current situation analysis of the distributed power supply related to the power balance of the active power distribution network,
2. the source planning is carried out in such a way that,
3. the load is predicted according to the load of the load,
4. the planning of the medium-voltage feeder line,
5. and (5) analyzing the planning effect.
An apparatus for power distribution network planning adaptability, the apparatus comprising an active power distribution network planning module.
Preferably, the active power distribution network planning module comprises a source-network-load ternary planning module and a primary and secondary coordination planning module.
Compared with the prior art, the invention has the beneficial effects that: the optimization method and the optimization device for the planning adaptability of the power distribution network provided by the invention set up an active power distribution network planning design system structure, study out an active power distribution network planning design method, including the aspects of the current situation of the active power distribution network, load prediction, source network load integrated balance and the like, and set out a network load collaborative planning scheme by repeating points, finally give out an electrical verification method of the active power distribution network, consider the influence of distributed power supply access, give play to the functions of the distributed power supply to the maximum extent, realize the optimization of source and network asset efficiency, and provide planning design reference for power distribution network planning designers.
Drawings
FIG. 1 is a block diagram of an active power distribution network planning architecture of the present invention;
fig. 2 is a schematic structural diagram of the planning apparatus of the present invention.
In the figure: the system comprises a 1-active power distribution network planning module, a 2-source-network-load ternary planning module and a 3-primary and secondary coordination planning module.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Referring to fig. 1-2, the present invention provides a technical solution: 1. a preferable method for planning adaptability of a power distribution network comprises the following steps:
the first step is as follows: constructing an active power distribution network planning system structure; active power distribution network planning no longer only takes meeting load requirements as the only standard of power grid requirement analysis, namely, power grid planning under the maximum load level is not only based on, but probabilistic power distribution network planning under different load levels and different distributed power supply output needs to be considered.
The second step is that: the active power distribution network status analysis method is characterized in that on the basis of traditional power grid status analysis, the active power distribution network planning needs to be added with analysis of distributed power supplies and energy storage systems, and analysis of distributed power supply access bottlenecks needs to be added.
1. Analyzing the current situation of the distributed power supply, namely analyzing whether the access voltage grade and the installed capacity of each type of distributed power supply are reasonable or not in the aspect of equipment; whether the distributed power supply protection device is configured according to a standard is judged, if yes, whether a high/low voltage protection device, a high/low frequency protection device, an anti-islanding protection device, a recovery grid-connected protection device, an overcurrent and short-circuit protection device, an accident disconnection device and the like are configured, in the aspect of operation, the operation condition is analyzed from the power generation condition, a daily active curve and voltage quality, the power generation condition needs to explain the annual power generation amount and power generation amount curve of the distributed power supply, and the distributed power supply permeability needs to be analyzed in a key point. And (4) analyzing a typical daily power generation power curve by using a daily active curve analysis, and calculating the output load rate of the distributed power supply. Analyzing the voltage quality condition of the accessed distributed power supply through the voltage quality at each load node of the feeder line after the power distribution network is accessed to the distributed power supply;
2. the distributed power supply access bottleneck analysis is to analyze the distributed power supply access bottleneck of the power grid under the current situation in the face of access requirements of a large number of distributed power supplies, and provides a prerequisite for the construction and transformation requirements of the power grid. The capacity of the distributed power supply accessed to the power distribution network is mainly restricted by 2 aspects of a transformer substation and a line, wherein the limiting conditions of the transformer substation for the access of the distributed power supply mainly comprise the maximum load of the transformer substation, the residual interval of the transformer substation and the like, and the limiting conditions of the line for the access of the distributed power supply comprise the line transmission capacity, the voltage deviation and the like;
the third step: the load of the active power distribution network is predicted,
1. and (4) load classification, wherein the load can be divided into controllable load, uncontrollable load and adjustable load according to different load participation degrees in the power grid dispatching. The controllable load actively participates in power grid dispatching and is a completely controllable load; the uncontrollable load is a rigid load; the adjustable load is a load which can participate in scheduling to a part of extent;
2. the load prediction and friendly load are completely controlled loads of the active distribution network, have strong guiding characteristics and have strong adaptability to response of a demand side. Friendly load in the active power distribution network becomes a key element of friendly interaction, and the load prediction of the active power distribution network needs to consider the friendly load on the basis of a total load prediction result to obtain the peak load of the active power distribution network, namely
PML＝PL-PfL
In the formula: pMLThe peak load of the active power distribution network; pLIs the maximum load; pfLIs friendly to load.
3. According to the distributed power supply output prediction, the photovoltaic output at different time periods has certain regularity, the photovoltaic output at daytime period approximately follows normal distribution, and the photovoltaic output at night does not output. Based on the photovoltaic enterprise power generation output data accumulation, a typical daily light intensity time sequence curve is drawn, Ia is a credible light intensity corresponding to a certain risk degree, based on a photovoltaic power generation model, photovoltaic output and illumination intensity are approximately in a unitary linear relation, photovoltaic all-day output data are accumulated to form a photovoltaic system daily output distribution curve, and the cumulative distribution function of the photovoltaic output is
F(P)＝α
In the formula: f (P) is a cumulative distribution function of photovoltaic output; alpha is photovoltaic output risk degree, and a credible output value of the distributed power supply in the long-term can be calculated by combining the total installed capacity and the credible output value of the unit capacity of the regional distributed power supply
Pzα＝PzPα/P
In the formula: pz alpha is credible output of a distributed power supply in a planned area perspective year; pz is the total installed capacity of the distributed power supply in the planned area perspective year; p alpha is a unit installed capacity credible output; p is the unit DG installed capacity;
the fourth step: the active power distribution network load collaborative planning is characterized in that with the large-scale access of DGs and the continuous improvement of permeability, compared with a traditional planning method, when a power distribution network planning scheme is formulated, the influence factor of DG output instability needs to be considered, so that the planning scene becomes more complex, and the distributed power supply access, a transformer substation, a medium-voltage network frame scheme and electrical calculation are briefly introduced below.
1. And (3) accessing the distributed power supply, wherein the voltage level of the accessed distributed power supply is related to the capacity scale of the accessed distributed power supply according to the relevant requirements of the power distribution network planning and design guide rule, and the voltage level is accessed.
2. The transformer substation scheme is formulated, firstly, the total capacity of the transformer substation is calculated, the loads of upper-level and lower-level direct supply large users are deducted on the basis of load prediction of a planning area, the loads of power supply to the outside and the power supply to the area outside are considered, meanwhile, the 10% risk probability output interval of the distributed power supply participates in balance, and the transformer substation capacity balance formula is
RS＝(PL1-PuL-Pdl-PW-PDG-PfL)σ-R0
In the formula: rSThe required transformer substation capacity is obtained; pL1The load is a predicted value; puLDirectly supplying user load for the upper-level power grid; pdlDirectly supplying user load to the power grid of the current level; pWA subordinate grid load supplied by an external grid; pDGThe output value is the output value of the distributed power supply of the lower-level power grid under the risk probability of 10%; sigma is a planning capacity-load ratio; r0 is the current transformer capacity of the planning area, then the number of the transformer stations is calculated, and 63MV & A, 3 and 4 configurations are preferably selected for the capacity of a single main transformer in the A + and A-type areas; the type B area is preferably configured by 63, 50 MV.A, 2, 3 stations; C. the D-type region is preferably arranged in 50 MV.A, 2, 3 stations. The capacity of a single transformer substation can be configured according to the actual conditions of the city company, and the required total capacity is divided by the capacity of the single transformer substationThe number of the required transformer stations.
3. The medium-voltage power grid scheme is formulated, firstly, networks are divided, and more power supply enterprises adopt grid planning according to the requirement of national power grid companies on refinement of power grid planning. Active power distribution network planning should also be developed on the basis of grid planning. The grid division is combined with the urban overall planning space layout, the land is taken as a basic unit, the natural factors of roads, mountains and rivers are considered, and meanwhile, the effective connection with the urban overall planning is carried out; and then determining the scale of the feeder line, calculating the block load by taking a block as a unit by adopting a space load prediction method, and accumulating to obtain the load of the grid by considering the demand coefficient and the block synchronization rate coefficient. Removing the output value of 380/220V low-voltage internet distributed power supply under the risk probability of 10 percent, and calculating the number of medium-voltage feeder lines by the formula
RF＝(PWL-P380-DG-PfL)/Kt-R0
In the formula: rFThe total capacity of 10kV feeder lines is needed by the grid cells; pWLPredicting the load of the grid unit; p380-DGThe output value is a value of 380V and below under the 10% risk probability of the distributed unit; ktGenerally, the load rate of the feeder line is 0.4-0.6 for industrial users, 0.3-0.5 for commercial users and 0.2-0.4 for residential users; and finally, carrying out a wiring mode, wherein a double-ring type and a single-ring type are adopted for the cable network, the B, C-type area of the overhead network adopts multi-segment moderate connection, and the D-type area adopts multi-segment single connection or radial wiring.
4. Electrical calculation; in order to ensure safe, stable and reliable operation of the power distribution network, load flow calculation is required. The active power distribution network power flow calculation is to increase random injection amount on the basis of traditional power flow distribution, so that a single flow direction is changed into a bilateral interaction mode. And respectively calculating the power flow distribution under various conditions such as maximum load minimum output, minimum load maximum output and the like, and judging whether the conditions of power out-of-limit and node voltage out-of-limit exist. And meanwhile, voltage flicker, voltage deviation and the like of each distributed power supply access point when the output of the distributed power supply access point is greatly changed are calculated.
The fifth step: a certain newly-built economic development area is selected to develop the application of the calculation example, the area of the development area is 11.56km2, and the land property mainly refers to high-end industry, scientific and technological research and development and commercial living. The regional distributed power supply mainly adopts photovoltaic power generation and 10kV power grid access.
1. Analyzing the current situation of the distributed power supply related to the power balance of the active power distribution network, firstly analyzing the permeability of the distributed power supply, then analyzing the generated energy, the maximum utilization hours of the generated electricity of the photovoltaic power station, the total on-grid electricity quantity and the percentage of the total on-grid electricity quantity to the total generated energy, collecting the daily load curve of the photovoltaic enterprise in the 3 rd quarter, and obtaining the ratio of the confidence output of the distributed power supply to the installed capacity of the percentage risk degree of the early peak, the midday peak and the late peak.
2. And (4) source planning, calculating the available roof area of the photovoltaic in the development area, the utilization coefficient of the roof area, the installed capacity of the photovoltaic in unit area and the installation inclination angle of the photovoltaic panel to obtain the total installed capacity of the photovoltaic in the demonstration area in the planning statistical year.
3. And (4) predicting the maximum load number of a typical day in the demonstration area by load prediction, wherein the load number of a 10kV network, the direct load number (110kV crystal variation) of a 110kV network and the predicted number of the load of the 10kV network are supplied.
4. And (4) planning a medium-voltage feeder line, and carrying out power balance on a 10kV line based on the confidence output of the distributed power supply with the risk degree of 10%.
5. And (4) analyzing the planning effect, and calculating the numerical value of the permeability, which can be completely absorbed by photovoltaic power generation for many years in the demonstration area.
An apparatus for power distribution network planning adaptability comprises an active power distribution network planning module 1.
Specifically, the active power distribution network planning module 1 comprises a source-network-load ternary planning module 2 and a primary and secondary coordination planning module 3.
In the description of the present invention, unless otherwise expressly specified or limited, the terms "mounted," "connected," and "fixed" are to be construed broadly, e.g., as meaning either a fixed connection, a removable connection, or an integral part; can be mechanically or electrically connected; either directly or indirectly through intervening media, either internally or in any other relationship. The specific meanings of the above terms in the present invention can be understood in specific cases to those skilled in the art.
The standard parts used in the invention can be purchased from the market, the special-shaped parts can be customized according to the description of the specification and the accompanying drawings, the specific connection mode of each part adopts conventional means such as bolts, rivets, welding and the like mature in the prior art, the machines, the parts and equipment adopt conventional models in the prior art, and the circuit connection adopts the conventional connection mode in the prior art, so that the detailed description is omitted.
Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that changes, modifications, substitutions and alterations can be made in these embodiments without departing from the principles and spirit of the invention, the scope of which is defined in the appended claims and their equivalents.
Claims (3)
1. A preferable method for planning adaptability of a power distribution network is characterized by comprising the following steps: the method comprises the following steps:
the first step is as follows: constructing an active power distribution network planning system structure;
the second step is that: the current situation analysis of the active power distribution network,
1. the status quo analysis of the distributed power supply,
2. analyzing the access bottleneck of the distributed power supply;
the third step: the load of the active power distribution network is predicted,
1. the load is classified into a load classification mode,
2. the load is predicted in a load prediction mode,
3. predicting the output of the distributed power supply;
the fourth step: the network load collaborative planning of the active power distribution network,
1. the access of the distributed power supply is realized,
2. the scheme of the transformer substation is formulated,
3. the medium-voltage power grid scheme is established,
4. electrical calculation;
the fifth step: selecting a certain newly-built economic development area to develop the calculation example application,
1. the current situation analysis of the distributed power supply related to the power balance of the active power distribution network,
2. the source planning is carried out in such a way that,
3. the load is predicted according to the load of the load,
4. the planning of the medium-voltage feeder line,
5. and (5) analyzing the planning effect.
2. The utility model provides a device of distribution network planning adaptability which characterized in that: the device comprises an active power distribution network planning module (1).
3. The device of claim 2, wherein the device comprises: the active power distribution network planning module (1) comprises a source-network-load ternary planning module (2) and a primary and secondary coordination planning module (3).
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Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103971173A (en) * | 2014-04-28 | 2014-08-06 | 广东电网公司电力科学研究院 | Method and system for controlling capacity of transformer substations of initiative power distribution network |
| CN104392275A (en) * | 2014-11-11 | 2015-03-04 | 广东电网有限责任公司电力科学研究院 | Planning method for active power distribution network comprising distributed photovoltaic grid-connected network |
| CN107370182A (en) * | 2017-08-02 | 2017-11-21 | 国网安徽省电力公司合肥供电公司 | A kind of active distribution network ternary planning system distributed power source accesses planing method |
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2020
- 2020-09-11 CN CN202010952346.7A patent/CN112101654A/en active Pending
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| CN103971173A (en) * | 2014-04-28 | 2014-08-06 | 广东电网公司电力科学研究院 | Method and system for controlling capacity of transformer substations of initiative power distribution network |
| CN104392275A (en) * | 2014-11-11 | 2015-03-04 | 广东电网有限责任公司电力科学研究院 | Planning method for active power distribution network comprising distributed photovoltaic grid-connected network |
| CN107370182A (en) * | 2017-08-02 | 2017-11-21 | 国网安徽省电力公司合肥供电公司 | A kind of active distribution network ternary planning system distributed power source accesses planing method |
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| Title |
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| 顾永福 等: "主动配电网规划方法研究", 《发电技术》, vol. 39, no. 3, 30 June 2018 (2018-06-30), pages 220 * |
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