CN112186753A - Method and system for determining system new energy installation scale - Google Patents

Method and system for determining system new energy installation scale Download PDF

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CN112186753A
CN112186753A CN202011020601.0A CN202011020601A CN112186753A CN 112186753 A CN112186753 A CN 112186753A CN 202011020601 A CN202011020601 A CN 202011020601A CN 112186753 A CN112186753 A CN 112186753A
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cost
power
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scale
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CN112186753B (en
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孙沛
李雨田
李丁
傅旭
胡斌
张雨津
范丽霞
杨攀峰
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Northwest Electric Power Design Institute of China Power Engineering Consulting Group
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    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
    • H02J3/00—Circuit arrangements for ac mains or ac distribution networks
    • G—PHYSICS
    • G06—COMPUTING; CALCULATING OR COUNTING
    • G06Q—INFORMATION AND COMMUNICATION TECHNOLOGY [ICT] SPECIALLY ADAPTED FOR ADMINISTRATIVE, COMMERCIAL, FINANCIAL, MANAGERIAL OR SUPERVISORY PURPOSES; SYSTEMS OR METHODS SPECIALLY ADAPTED FOR ADMINISTRATIVE, COMMERCIAL, FINANCIAL, MANAGERIAL OR SUPERVISORY PURPOSES, NOT OTHERWISE PROVIDED FOR
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    • G06Q10/04—Forecasting or optimisation specially adapted for administrative or management purposes, e.g. linear programming or "cutting stock problem"
    • G—PHYSICS
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    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
    • H02J3/00—Circuit arrangements for ac mains or ac distribution networks
    • H02J3/008—Circuit arrangements for ac mains or ac distribution networks involving trading of energy or energy transmission rights
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    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
    • H02J2203/00—Indexing scheme relating to details of circuit arrangements for AC mains or AC distribution networks
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    • Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E40/00—Technologies for an efficient electrical power generation, transmission or distribution
    • Y02E40/70—Smart grids as climate change mitigation technology in the energy generation sector
    • 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

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Abstract

The invention provides a method for determining the installed scale of new energy of a system. And calculating the power consumption cost under different installed scales of the new energy according to the given power transmission capacity of the system and the investment cost of the power transmission system and by combining the unit power investment cost and the output characteristic data of the new energy, and obtaining the installed scale of the new energy of the system by taking the overall system economic optimization as a target function. By adopting the method, the system new energy installation scale can be determined, and the power grid utilization rate is improved.

Description

Method and system for determining system new energy installation scale
Technical Field
The invention relates to the field of power system planning, in particular to a method and a system for determining the installed scale of new energy of a system aiming at a new energy delivery base.
Background
For the new energy sent out of the base, on the premise of certain system conveying capacity, the scale of the new energy can be properly over-built, and the utilization rate of a power grid can be improved at the cost of generating a small amount of electricity abandonment. In a traditional design, all levels of voltage transmission capacity are configured according to the full capacity of the new energy scale accessed by a base. However, because wind power and photovoltaic power generation output has the characteristics of intermittence, randomness and fluctuation, the output of new energy is large in a small amount of time in one year, and the transmission capacity cannot be achieved in most of time, so that the power grid can achieve the designed transmission capacity only in a small amount of time in one year.
Therefore, the pursuit of sending out new energy in full can greatly improve the redundancy of the power grid, resulting in lower utilization rate of the power grid. Therefore, under the condition of certain power transmission capacity of the system, the scale of new energy can be properly over-distributed, and the utilization rate of a power grid is improved.
Disclosure of Invention
In order to properly over-allocate the new energy scale and improve the utilization rate of a power grid, the invention provides a method for determining the installed scale of the new energy of the system. According to the method, the power consumption cost under different new energy installed scale conditions is obtained according to the conveying capacity and investment cost of a system to be researched and the new energy unit power investment and output characteristic data of the system. And obtaining the optimal scheme of the system new energy installation scale according to the power consumption cost. By adopting the method, the system new energy installation scale can be determined, and the power grid utilization rate is improved.
In order to achieve the purpose, the invention adopts the following technical scheme:
a method for determining the installed scale of new energy of a system comprises the following steps:
acquiring the transmission capacity and investment cost of the system, and new energy unit power investment and output characteristic data;
calculating the generated energy of different new energy installation scales according to the output characteristic data of the new energy and the conveying capacity of the system, calculating the annual cost of a conveying channel of the system according to the investment cost of the conveying capacity of the system, and calculating the power consumption cost of different new energy installation scales according to the annual cost of the conveying channel of the system, the generated energy of different new energy installation scales and the investment cost of unit power of the new energy;
and (4) obtaining the optimal new energy installation scale by taking the lowest system power consumption cost as a target function.
As a further improvement of the invention, the objective function obtains the optimal installation scheme of the system by comparing the power consumption cost of different new energy installation scales.
As a further development of the invention, the objective function can be determined by the following formula:
the objective function is: min (New energy power cost + power grid power cost)
New energy power consumption cost (new energy investment annual cost + new energy operation and maintenance cost) ÷ annual network power generation capacity
The power grid power consumption cost is (power grid investment annual cost + power grid operation and maintenance cost) divided by annual grid power generation capacity.
As a further development of the invention, the cost can be determined by the following formula:
the new energy investment annual cost is the new energy installed scale, the new energy unit investment and the equal annual value coefficient;
the new energy operation and maintenance cost is equal to the new energy installed scale, the new energy unit investment and the operation and maintenance rate;
the annual cost of the power grid investment is the scale of the matched power grid, the unit investment of the power grid and the annual value coefficient;
the operation and maintenance cost of the power grid is the scale of the matched power grid, the unit investment of the power grid and the operation and maintenance rate.
As a further improvement of the invention, the method also comprises the steps of obtaining the system power generation amount and the power abandon rate: firstly, simulating a power output sequence of the new energy 8760 through a characteristic curve of the new energy and the installed scale; and secondly, according to the scale of the matched power grid, the part of the new energy output sequence, which is larger than the sending capacity of the power grid scale, is electricity abandon, and the rest is power generation amount, and all data are accumulated to obtain the annual on-line power generation amount.
A system for determining the installed size of new energy for a system, comprising:
the acquisition module is used for acquiring the transmission capacity and investment cost of the system, and new energy unit power investment and output characteristic data;
the calculation module is used for calculating the generated energy of different new energy installation scales according to the new energy output characteristic data and the system conveying capacity, calculating the annual cost of a system conveying channel according to the investment cost of the system conveying capacity, and calculating the power consumption cost of different new energy installation scales according to the annual cost of the system conveying channel, the generated energy of different new energy installation scales and the new energy unit power investment cost;
and the confirmation module is used for obtaining the optimal new energy installation scale by taking the lowest system power consumption cost as a target function.
Compared with the prior art, the invention has the beneficial effects that:
the method can obtain the economically optimal new energy installed scale of the system under the condition of certain power grid transmission capacity. Meanwhile, the optimization method has the characteristics of convenience and quickness in calculation. By adopting the method, the system new energy installation scale can be determined, and the power grid utilization rate is improved.
Drawings
FIG. 1 is a policy flow diagram of the present invention;
FIG. 2 is an exemplary wiring diagram;
FIG. 3 is a graph of installed photovoltaic scale versus power rejection and cost of power consumption for an exemplary system.
Detailed Description
The following is a detailed description of an example of a new energy delivery base, with reference to the accompanying drawings. It should be emphasized that the following description is merely exemplary in nature and is not intended to limit the scope of the invention or its application.
The invention discloses a method for determining the installed scale of a new energy source of a system.
The method comprises the following specific steps:
(1) collecting system transmission capacity, investment cost of the system transmission capacity, unit power investment cost of new energy of the system and output characteristic data in a researched system;
(2) calculating annual cost of a system conveying channel according to investment cost of system conveying capacity, calculating generated energy of different new energy installed scales according to the new energy output characteristic data and the conveying capacity of the system, and calculating power consumption cost of the different new energy installed scales according to the information and the investment cost of new energy unit power.
(3) And selecting the optimal installed scale of the new energy according to the electricity consumption cost.
Examples
A certain new energy source is sent out from a base 750kV main transformer which is 3 multiplied by 2100 MVA; the signals are converged into 6 330kV collection stations, and each collection station is mainly changed into 3 x 360 MVA; the collection station is connected to the 750kV collection station through a 330kV return line, as shown in figure 2. Approximately considering that the length of the line is about 30km and the conducting wire adopts 4 multiplied by 400mm2。
The method comprises the following specific operation steps:
(1) collecting data such as conveying capacity, conveying investment cost, new energy unit power investment cost and the like in a researched system:
the transmission capacity of the system is 750kV, and the main transformer is 3 multiplied by 2100 MVA; the resulting mixture was fed to 6 330kV collection stations, each of which was then converted to 3X 360 MVA.
According to design control indexes of power grid engineering limits (2018 level), total main transformer investment is 7.5 hundred million yuan; the total investment of each 330kV collection station is 1.8 hundred million yuan; the total investment of each circuit is 4050 ten thousand yuan.
The photovoltaic unit power investment is 4000 yuan/kW.
(2) Calculating the electricity consumption cost under different new energy installation scales:
the annual cost of the system conveying channel is as follows: the annual cost of the power transformation part is 2.81 million yuan, and the annual cost of the line part is 3025 ten thousand yuan.
The generated energy under different installed scales is calculated, and the calculation result is shown in table 1.
Table 1 photovoltaic installed scale and electricity rejection rate case units: 10MW, hundred million kWh
Photovoltaic installation 600 660 720 780 840 900 960 1020 1200
Electric energy production 91.11 100.21 109.18 117.56 125.08 131.65 137.36 142.38 154.49
Rate of electricity rejection 0.0％ 0.0％ 0.1％ 0.7％ 1.9％ 3.7％ 5.8％ 8.1％ 15.2％
And calculating the electricity consumption cost under different new energy installation scales, wherein the calculation result is shown in a table 2 and a figure 3.
TABLE 2 installation scale of photovoltaic and electricity consumption cost situation
Figure BDA0002700038070000051
(3) Selecting the optimal new energy installed scale:
as can be seen from the figures and the tables, as the electricity abandonment rate of the system increases along with the increase of the scale of the photovoltaic installation machine, the electricity consumption cost is firstly reduced and then increased. When the system is installed with 7800MW, the electricity consumption cost is 0.315 yuan/kWh, the national economy of the whole system is optimal, and the electricity abandonment rate is about 1 percent. Therefore, for the system, the reasonable electricity abandonment rate is 1 percent, and the installation scale is 7800 MW.
The invention also provides a system for determining the installed scale of the new energy of the system, which comprises the following steps:
the acquisition module is used for acquiring the transmission capacity and investment cost of the system, and new energy unit power investment and output characteristic data;
the calculation module is used for calculating the generated energy of different new energy installation scales according to the new energy output characteristic data and the system conveying capacity, calculating the annual cost of a system conveying channel according to the investment cost of the system conveying capacity, and calculating the power consumption cost of different new energy installation scales according to the annual cost of the system conveying channel, the generated energy of different new energy installation scales and the new energy unit power investment cost;
and the confirmation module is used for obtaining the optimal new energy installation scale by taking the lowest system power consumption cost as a target function.
Another object of the present invention is to provide an apparatus for determining the installed scale of new energy of a system, comprising:
a memory for storing a plurality of data to be transmitted,
a processor for processing the received data, wherein the processor is used for processing the received data,
the processor is configured to: and executing the method for determining the installed scale of the new energy of the system by considering.
The present invention also provides a computer readable storage medium having instructions that, when executed by a processor, enable the processor to perform a method of determining a system new energy installation size.
The foregoing is a more detailed description of the invention and it is not intended that the invention be limited to the specific embodiments described herein, but that various modifications, alterations, substitutions and equivalents will be apparent to those skilled in the art without departing from the spirit of the invention, and are intended to be within the scope of the invention as defined by the appended claims.

Claims (6)

1. A method for determining the installed scale of new energy of a system is characterized by comprising the following steps:
acquiring the transmission capacity and investment cost of the system, and new energy unit power investment and output characteristic data;
calculating the generated energy of different new energy installation scales according to the output characteristic data of the new energy and the conveying capacity of the system, calculating the annual cost of a conveying channel of the system according to the investment cost of the conveying capacity of the system, and calculating the power consumption cost of different new energy installation scales according to the annual cost of the conveying channel of the system, the generated energy of different new energy installation scales and the investment cost of unit power of the new energy;
and (4) obtaining the optimal new energy installation scale by taking the lowest system power consumption cost as a target function.
2. The method for determining the installed scale of the new energy source of the system as claimed in claim 1, wherein the objective function obtains the optimal installed solution of the system by comparing the power consumption cost of different installed scales of the new energy source.
3. The method for determining the installed scale of the new energy resource of the system according to claim 1, wherein the objective function is obtained by the following formula:
the objective function is: min (New energy power cost + power grid power cost)
New energy power consumption cost (new energy investment annual cost + new energy operation and maintenance cost) ÷ annual network power generation capacity
The power grid power consumption cost is (power grid investment annual cost + power grid operation and maintenance cost) divided by annual grid power generation capacity.
4. The method for determining the installed scale of new energy resources of a system according to claim 1, wherein the cost is determined by the following formula:
the new energy investment annual cost is the new energy installed scale, the new energy unit investment and the equal annual value coefficient;
the new energy operation and maintenance cost is equal to the new energy installed scale, the new energy unit investment and the operation and maintenance rate;
the annual cost of the power grid investment is the scale of the matched power grid, the unit investment of the power grid and the annual value coefficient;
the operation and maintenance cost of the power grid is the scale of the matched power grid, the unit investment of the power grid and the operation and maintenance rate.
5. The method for determining the installed scale of the new energy of the system as claimed in claim 1, further comprising the steps of obtaining the power generation amount and the power abandonment rate of the system: firstly, simulating a power output sequence of the new energy 8760 through a characteristic curve of the new energy and the installed scale; and secondly, according to the scale of the matched power grid, the part of the new energy output sequence, which is larger than the sending capacity of the power grid scale, is electricity abandon, and the rest is power generation amount, and all data are accumulated to obtain the annual on-line power generation amount.
6. A system for determining the installed new energy scale of a system, comprising:
the acquisition module is used for acquiring the transmission capacity and investment cost of the system, and new energy unit power investment and output characteristic data;
the calculation module is used for calculating the generated energy of different new energy installation scales according to the new energy output characteristic data and the system conveying capacity, calculating the annual cost of a system conveying channel according to the investment cost of the system conveying capacity, and calculating the power consumption cost of different new energy installation scales according to the annual cost of the system conveying channel, the generated energy of different new energy installation scales and the new energy unit power investment cost;
and the confirmation module is used for obtaining the optimal new energy installation scale by taking the lowest system power consumption cost as a target function.
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Publication number Priority date Publication date Assignee Title
US20150339762A1 (en) * 2014-05-19 2015-11-26 Geostellar, Inc. Systems and Methods for Generating an Online Solar Energy Marketplace
CN108023348A (en) * 2017-12-13 2018-05-11 国网安徽省电力有限公司 A kind of method that the optimal peak regulation installation scale of wind-powered electricity generation is determined based on Transmission Corridor
CN110020743A (en) * 2018-12-29 2019-07-16 国网新疆电力有限公司经济技术研究院 A kind of interconnection passway for transmitting electricity method for planning capacity

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20150339762A1 (en) * 2014-05-19 2015-11-26 Geostellar, Inc. Systems and Methods for Generating an Online Solar Energy Marketplace
CN108023348A (en) * 2017-12-13 2018-05-11 国网安徽省电力有限公司 A kind of method that the optimal peak regulation installation scale of wind-powered electricity generation is determined based on Transmission Corridor
CN110020743A (en) * 2018-12-29 2019-07-16 国网新疆电力有限公司经济技术研究院 A kind of interconnection passway for transmitting electricity method for planning capacity

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吴江 等: "基于度电成本指标的光伏电站装机规模优化设计", 《冶金动力》 *

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