CN108879659A - A kind of evaluation method of elasticity power distribution network flexibility - Google Patents

A kind of evaluation method of elasticity power distribution network flexibility Download PDF

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Publication number
CN108879659A
CN108879659A CN201810652859.9A CN201810652859A CN108879659A CN 108879659 A CN108879659 A CN 108879659A CN 201810652859 A CN201810652859 A CN 201810652859A CN 108879659 A CN108879659 A CN 108879659A
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index
follows
calculation method
distributed
flexibility
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王守相
王洪坤
潘志新
王建明
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Tianjin University
Electric Power Research Institute of State Grid Jiangsu Electric Power Co Ltd
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Tianjin University
Electric Power Research Institute of State Grid Jiangsu Electric Power Co Ltd
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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
    • H02J3/383—
    • H02J3/386—
    • 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
    • H02J2203/00—Indexing scheme relating to details of circuit arrangements for AC mains or AC distribution networks
    • H02J2203/20—Simulating, e g planning, reliability check, modelling or computer assisted design [CAD]
    • 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
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E10/00—Energy generation through renewable energy sources
    • Y02E10/50—Photovoltaic [PV] energy
    • Y02E10/56—Power conversion systems, e.g. maximum power point trackers
    • 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
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E10/00—Energy generation through renewable energy sources
    • Y02E10/70—Wind energy
    • Y02E10/76—Power conversion electric or electronic aspects

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  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Supply And Distribution Of Alternating Current (AREA)

Abstract

The invention discloses a kind of evaluation method of elastic power distribution network flexibility, 1) construct elastic power distribution network flexibility assessment indicator system frame；2) each two-level appraisement index value is calculated；3) the Index Weights value of two-level appraisement index is determined；4) evaluation to first class index, the final evaluation realized to elastic power distribution network flexibility are realized in the quantitative calculating for passing through two-level index；The evaluation method of the elasticity power distribution network flexibility has directive function to the development of intelligent distribution network, scientific and effective can reflect the ability of power distribution network reply distributed generation resource and load fluctuation.

Description

A kind of evaluation method of elasticity power distribution network flexibility
Technical field
The present invention relates to distribution network engineering technical field, in particular to a kind of evaluation method of elastic power distribution network flexibility.
Background technique
Power distribution network is in the load end of electric system, and the safety and stablization of operation have direct shadow to electric system It rings.The flexibility of power distribution network, which is distribution system, requires the problem of fully considering in operation and planning stage, as China is a large amount of Distributed generation resource accesses power distribution network, exacerbates elastic power distribution network net load fluctuation and uncertainty, affects the flexible of power distribution network Property, the flexibility of power distribution network is insufficient.The flexible Journal of Sex Research of China's elasticity power distribution network lacks flexibility and matches also in initial stage at present The index Evaluation Method of Flexible Power Grid.
Summary of the invention
The object of the present invention is to provide a kind of evaluation methods of elastic power distribution network flexibility.
For this purpose, technical solution of the present invention is as follows：
A kind of evaluation method of elasticity power distribution network flexibility, includes the following steps：
1) elastic power distribution network flexibility assessment indicator system frame, the power distribution network flexibility assessment indicator system frame are constructed Including three parallel arrangement of level-one evaluation indexes and several two-level appraisements are provided under each level-one evaluation index refer to Mark；
2) tidal current analysis for carrying out power distribution network calculates, and calculates each two-level appraisement index value；
3) the Index Weights value of two-level appraisement index is determined；
4) evaluation to first class index is realized in the quantitative calculating for passing through two-level index, final to realize to elastic power distribution network spirit Active evaluation.
2, the evaluation method of elastic power distribution network flexibility according to claim 1, which is characterized in that the level-one Evaluation index includes flexible abundance index, flexibility index and flexible integration index.
Further, route N-1 is provided under the flexible abundance index parallel to turn for flexibility index, transformer N-1 turns to turn to turn for flexibility index, route N-2 for flexibility index, route minimum capacity for flexibility index, transformer N-2 Margin index, route average size margin index, the upward Capacity Margin index of transformer and the downward Capacity Margin index of transformer；
Distributed photovoltaic maximum permeability index, distributed wind-powered electricity generation maximum infiltration are provided under flexibility index parallel Rate index, distributed generation resource maximum permeability index, distributed photovoltaic maximum consumption electricity index, distributed wind-powered electricity generation maximum consumption Electricity index, distributed generation resource stability bandwidth index, net load minimum value index, net load maximum value index and net load stability bandwidth Index；
Distributed photovoltaic installed capacity is provided under flexible integration index parallel than index, distributed installed capacity of wind-driven power Compare index than index and demand response capacity than index, stored energy capacitance.
Further, the calculation method of parallel arrangement of two-level index is as follows under the flexible abundance index：
Route N-1 turns for flexibility index R11Calculation method it is as follows：
Transformer N-1 turns for flexibility index R12Calculation method it is as follows：
Transformer N-2 turns for flexibility index R13Calculation method it is as follows：
Route N-2 turns for flexibility index R14Calculation method it is as follows：
Route minimum capacity margin index R15Calculation method it is as follows：
Wherein, Pmax,liFor route i maximum allowed current, PliFor route i actual current, n is route sum；
Route average size margin index R16Calculation method it is as follows：
The upward Capacity Margin index R of transformer17Calculation method it is as follows：
Wherein, Pmax,tiFor transformer i maximum allowed current, PtiFor transformer i actual current, n is transformer number of units；
The downward Capacity Margin index R of transformer18Calculation method it is as follows：
Wherein, Pmin,tiFor transformer i minimum acceptable current, PtiFor transformer i actual current, n is transformer number of units.
Further, the calculation method of parallel arrangement of two-level index is as follows under the flexibility index：
Distributed photovoltaic permeability index R21Calculation method it is as follows：
Wherein, Ppv,sumFor distributed photovoltaic total installation of generating capacity, PmaxFor power distribution network peak load peak value；
Distributed wind-powered electricity generation permeability index R22Calculation method it is as follows：
Wherein, Pw,sumFor distributed wind-powered electricity generation total installation of generating capacity, PmaxFor power distribution network peak load peak value；
Distributed generation resource permeability index R23Calculation method it is as follows：
Wherein, PDG,sumFor distributed generation resource total installation of generating capacity, PmaxFor power distribution network peak load peak value；
Distributed photovoltaic consumption rate index R24Calculation method it is as follows：
Wherein,Power is dissolved for distributed photovoltaic,For distributed photovoltaic installed capacity, T is measurement period；
Distributed wind electricity digestion rate index R25Calculation method it is as follows：
Wherein,For distributed wind electricity digestion power,For distributed installed capacity of wind-driven power, T is measurement period；
Distributed generation resource maximum consumption rate index R26Calculation method it is as follows：
Wherein,Power is dissolved for distributed generation resource, isDistributed generation resource installed capacity, T are measurement period；
Distributed generation resource stability bandwidth index R27Calculation method it is as follows：
Wherein,For distributed generation resource current time power,For distributed generation resource previous moment power, T is the period；
Net load Wave crest and wave trough ratio indicator R28Calculation method it is as follows：
Wherein,For net load valley value,For net load crest value；
Net load stability bandwidth index R29Calculation method it is as follows：
Wherein,For current time net load power,For previous moment net load power, T is the period.
Further, the calculation method of parallel arrangement of two-level index is as follows under the described and flexible integration index：
Distributed photovoltaic installed capacity is than index R31Calculation method it is as follows：
Wherein, Ppv,iFor photovoltaic installed capacity, PDG,iFor distributed generation resource installed capacity；
Distributed installed capacity of wind-driven power is than index R32Calculation method it is as follows：
Wherein, Ppw,iFor distributed installed capacity of wind-driven power, PDG,iFor distributed generation resource installed capacity；
Stored energy capacitance is than index R33Calculation method it is as follows：
Wherein, PESS,iFor energy storage installed capacity, PDG,iFor distributed generation resource installed capacity；
Demand response capacity is than index R34Calculation method it is as follows：
Wherein, PDR,iFor demand response load power, PL,iFor load power, n is load number, and k is demand response load Number.
Further, the first class index evaluation method is：According to the calculated value of two-level index and comprehensive expertise Weighted value, take linear weighted function summation, determine the flexibility score value of first class index, to the flexibility level of first class index into Row evaluation.
Compared with prior art, the evaluation method of the elasticity power distribution network flexibility has guidance to the development of intelligent distribution network Effect receives the flexibility of three the abundance of new energy flexibility, adaptability and integration angles to power distribution network from power distribution network Overall merit is carried out, scientific and effective can reflect the ability of power distribution network reply distributed generation resource and load fluctuation.Building Elastic power distribution network flexibility evaluation index be consider safety factor, the digestion capability of power distribution network, it is contemplated that new energy with Machine.Elastic power distribution network flexibility evaluation is complicated multiple index evaluation problem, which divides expert estimation and level Phase separation combines, and can be very good to solve the problems, such as this complexity, and fully consider between flexible abundance, adaptability, integration Influence each other and act on, can guarantee the science and accuracy of evaluation result.
Detailed description of the invention
Fig. 1 is the flow chart of the evaluation method of elastic power distribution network flexibility provided by the invention.
Specific embodiment
With reference to the accompanying drawing and specific embodiment the present invention is described further, but following embodiments are absolutely not to this hair It is bright to have any restrictions.
A kind of evaluation method of elasticity power distribution network flexibility, as shown in Figure 1, including the following steps：
1) elastic power distribution network flexibility assessment indicator system frame, the power distribution network flexibility assessment indicator system frame are constructed Including three parallel arrangement of level-one evaluation indexes and several two-level appraisements are provided under each level-one evaluation index refer to Mark；
2) tidal current analysis for carrying out power distribution network calculates, and calculates each two-level appraisement index value；
3) the Index Weights value of two-level appraisement index is determined；
4) evaluation to first class index is realized in the quantitative calculating for passing through two-level index, final to realize to elastic power distribution network spirit Active evaluation；The first class index evaluation method is：According to the calculated value of two-level index and the weight of comprehensive expertise Value, takes linear weighted function summation, determines the flexibility score value of first class index, comment the flexibility level of first class index Valence.
Wherein, as shown in table 1, the level-one evaluation index include flexible abundance index, flexibility index and Flexible integration index；
Route N-1 is provided under the flexible abundance index parallel to turn for flexibility index, transformer N-1 turns for spirit Activity index, transformer N-2 turn for flexibility index, route N-2 turn for flexibility index, route minimum capacity margin index, The upward Capacity Margin index of route average size margin index, transformer and the downward Capacity Margin index of transformer；
Distributed photovoltaic maximum permeability index, distributed wind-powered electricity generation maximum infiltration are provided under flexibility index parallel Rate index, distributed generation resource maximum permeability index, distributed photovoltaic maximum consumption electricity index, distributed wind-powered electricity generation maximum consumption Electricity index, distributed generation resource stability bandwidth index, net load minimum value index, net load maximum value index and net load stability bandwidth Index；
Distributed photovoltaic installed capacity is provided under flexible integration index parallel than index, distributed installed capacity of wind-driven power Compare index than index and demand response capacity than index, stored energy capacitance.
Specifically, the calculation method of parallel arrangement of two-level index is as follows under the flexible abundance index：
Route N-1 turns for flexibility index R11Calculation method it is as follows：
Transformer N-1 turns for flexibility index R12Calculation method it is as follows：
Transformer N-2 turns for flexibility index R13Calculation method it is as follows：
Route N-2 turns for flexibility index R14Calculation method it is as follows：
Route minimum capacity margin index R15Calculation method it is as follows：
Wherein, Pmax,liFor route i maximum allowed current, PliFor route i actual current, n is route sum；
Route average size margin index R16Calculation method it is as follows：
The upward Capacity Margin index R of transformer17Calculation method it is as follows：
Wherein, Pmax,tiFor transformer i maximum allowed current, PtiFor transformer i actual current, n is transformer number of units；
The downward Capacity Margin index R of transformer18Calculation method it is as follows：
Wherein, Pmin,tiFor transformer i minimum acceptable current, PtiFor transformer i actual current, n is transformer number of units.
Specifically, the calculation method of parallel arrangement of two-level index is as follows under the flexibility index：
Distributed photovoltaic permeability index R21Calculation method it is as follows：
Wherein, Ppv,sumFor distributed photovoltaic total installation of generating capacity, PmaxFor power distribution network peak load peak value；
Distributed wind-powered electricity generation permeability index R22Calculation method it is as follows：
Wherein, Pw,sumFor distributed wind-powered electricity generation total installation of generating capacity, PmaxFor power distribution network peak load peak value；
Distributed generation resource permeability index R23Calculation method it is as follows：
Wherein, PDG,sumFor distributed generation resource total installation of generating capacity, PmaxFor power distribution network peak load peak value；
Distributed photovoltaic consumption rate index R24Calculation method it is as follows：
Wherein,Power is dissolved for distributed photovoltaic,For distributed photovoltaic installed capacity, T is measurement period；
Distributed wind electricity digestion rate index R25Calculation method it is as follows：
Wherein,For distributed wind electricity digestion power,For distributed installed capacity of wind-driven power, T is measurement period；
Distributed generation resource maximum consumption rate index R26Calculation method it is as follows：
Wherein,Power is dissolved for distributed generation resource, isDistributed generation resource installed capacity, T are measurement period；
Distributed generation resource stability bandwidth index R27Calculation method it is as follows：
Wherein,For distributed generation resource current time power,For distributed generation resource previous moment power, T is the period；
Net load Wave crest and wave trough ratio indicator R28Calculation method it is as follows：
Wherein,For net load valley value,For net load crest value；
Net load stability bandwidth index R29Calculation method it is as follows：
Wherein,For current time net load power,For previous moment net load power, T is the period.
Specifically, the calculation method of parallel arrangement of two-level index is as follows under described and flexible integration index：
Distributed photovoltaic installed capacity is than index R31Calculation method it is as follows：
Wherein, Ppv,iFor photovoltaic installed capacity, PDG,iFor distributed generation resource installed capacity；
Distributed installed capacity of wind-driven power is than index R32Calculation method it is as follows：
Wherein, Ppw,iFor distributed installed capacity of wind-driven power, PDG,iFor distributed generation resource installed capacity；
Stored energy capacitance is than index R33Calculation method it is as follows：
Wherein, PESS,iFor energy storage installed capacity, PDG,iFor distributed generation resource installed capacity；
Demand response capacity is than index R34Calculation method it is as follows：
Wherein, PDR,iFor demand response load power, PL,iFor load power, n is load number, and k is demand response load Number.
Tax weighted value, as shown in table 2, two are carried out respectively to three first class index and two-level index respectively according to expertise Grade index assigns score value according to specific calculated value and expert, obtains the score of three first class index, the flexibility of elastic power distribution network is pressed The weighting of three first class index obtains total score.Three first class index answer expertise, flexible abundance index assignment 0.4, flexibly Adaptability assignment 0.4, flexible integration assignment 0.2；
The calculation method of first class index evaluation：According to the calculated value of two-level index and the weighted value of comprehensive expertise, adopt Line taking weighted sum method determines the flexibility score value of first class index, evaluates the flexibility level of first class index.
The calculation method of level-one evaluation index is：
Then according to the score value of first class index and the weighted value of comprehensive expertise, linear weighted function summation is taken, really The flexibility for determining power distribution network carries out overall merit to the flexibility of power distribution network.
The calculation method of flexibility total score R is：
R=0.4I1+0.4I2+0.2I3
Wherein, I1, I2, I3Respectively three first class index respective values；
The flexibility qualitative evaluation index of elastic power distribution network is divided into four grades：Flexibility is sufficient, it is desirable that first class index spirit Activity level and overall flexibility level are not less than 1；Flexibility is general, it is desirable that first class index flexibility is horizontal and overall flexible Property level is not less than 0.85；Flexibility is insufficient, it is desirable that first class index flexibility level and overall flexibility level are not less than 0.75；First class index flexibility level and overall flexibility level are below 0.75, are flexibility wretched insufficiency.
Table 1
Table 2

Claims (7)

1. a kind of evaluation method of elasticity power distribution network flexibility, which is characterized in that include the following steps：
1) elastic power distribution network flexibility assessment indicator system frame is constructed, which includes Three parallel arrangement of level-one evaluation indexes and several two-level appraisement indexs are provided under each level-one evaluation index；
2) tidal current analysis for carrying out power distribution network calculates, and calculates each two-level appraisement index value；
3) the Index Weights value of two-level appraisement index is determined；
4) evaluation to first class index is realized in the quantitative calculating for passing through two-level index, final to realize to elastic power distribution network flexibility Evaluation.
2. the evaluation method according to claim 1 for elastic power distribution network flexibility, which is characterized in that the level-one Evaluation index includes flexible abundance index, flexibility index and flexible integration index.
3. the evaluation method according to claim 2 for elastic power distribution network flexibility, which is characterized in that described is flexible Route N-1 is provided under abundance index parallel to turn for flexibility index, transformer N-1 turns for flexibility index, transformer N-2 Turn to turn to refer to for flexibility index, route minimum capacity margin index, route average size nargin for flexibility index, route N-2 Mark, the upward Capacity Margin index of transformer and the downward Capacity Margin index of transformer；
Distributed photovoltaic maximum permeability index is provided under flexibility index parallel, distributed wind-powered electricity generation maximum permeability refers to Mark, distributed generation resource maximum permeability index, distributed photovoltaic maximum consumption electricity index, distributed wind-powered electricity generation maximum dissolve electricity Index, distributed generation resource stability bandwidth index, net load minimum value index, net load maximum value index and net load stability bandwidth refer to Mark；
Distributed photovoltaic installed capacity is provided under flexible integration index parallel to refer to than index, distributed installed capacity of wind-driven power ratio Mark, stored energy capacitance compare index than index and demand response capacity.
4. the evaluation method according to claim 3 for elastic power distribution network flexibility, which is characterized in that described is flexible The calculation method of parallel arrangement of two-level index is as follows under abundance index：
Route N-1 turns for flexibility index R11Calculation method it is as follows：
Transformer N-1 turns for flexibility index R12Calculation method it is as follows：
Transformer N-2 turns for flexibility index R13Calculation method it is as follows：
Route N-2 turns for flexibility index R14Calculation method it is as follows：
Route minimum capacity margin index R15Calculation method it is as follows：
Wherein, Pmax,liFor route i maximum allowed current, PliFor route i actual current, n is route sum；
Route average size margin index R16Calculation method it is as follows：
The upward Capacity Margin index R of transformer17Calculation method it is as follows：
Wherein, Pmax,tiFor transformer i maximum allowed current, PtiFor transformer i actual current, n is transformer number of units；
The downward Capacity Margin index R of transformer18Calculation method it is as follows：
Wherein, Pmin,tiFor transformer i minimum acceptable current, PtiFor transformer i actual current, n is transformer number of units.
5. the evaluation method according to claim 4 for elastic power distribution network flexibility, which is characterized in that described is flexible The calculation method of parallel arrangement of two-level index is as follows under adaptive criteria：
Distributed photovoltaic permeability index R21Calculation method it is as follows：
Wherein, Ppv,sumFor distributed photovoltaic total installation of generating capacity, PmaxFor power distribution network peak load peak value；
Distributed wind-powered electricity generation permeability index R22Calculation method it is as follows：
Wherein, Pw,sumFor distributed wind-powered electricity generation total installation of generating capacity, PmaxFor power distribution network peak load peak value；
Distributed generation resource permeability index R23Calculation method it is as follows：
Wherein, PDG,sumFor distributed generation resource total installation of generating capacity, PmaxFor power distribution network peak load peak value；
Distributed photovoltaic consumption rate index R24Calculation method it is as follows：
Wherein,Power is dissolved for distributed photovoltaic,For distributed photovoltaic installed capacity, T is measurement period；
Distributed wind electricity digestion rate index R25Calculation method it is as follows：
Wherein,For distributed wind electricity digestion power,For distributed installed capacity of wind-driven power, T is measurement period；
Distributed generation resource maximum consumption rate index R26Calculation method it is as follows：
Wherein,Power is dissolved for distributed generation resource, isDistributed generation resource installed capacity, T are measurement period；
Distributed generation resource stability bandwidth index R27Calculation method it is as follows：
Wherein,For distributed generation resource current time power,For distributed generation resource previous moment power, T is the period；
Net load Wave crest and wave trough ratio indicator R28Calculation method it is as follows：
Wherein,For net load valley value,For net load crest value；
Net load stability bandwidth index R29Calculation method it is as follows：
Wherein,For current time net load power,For previous moment net load power, T is the period.
6. the evaluation method according to claim 5 for elastic power distribution network flexibility, which is characterized in that described and clever The calculation method of parallel arrangement of two-level index is as follows under integration index living：
Distributed photovoltaic installed capacity is than index R31Calculation method it is as follows：
Wherein, Ppv,iFor photovoltaic installed capacity, PDG,iFor distributed generation resource installed capacity；
Distributed installed capacity of wind-driven power is than index R32Calculation method it is as follows：
Wherein, Ppw,iFor distributed installed capacity of wind-driven power, PDG,iFor distributed generation resource installed capacity；
Stored energy capacitance is than index R33Calculation method it is as follows：
Wherein, PESS,iFor energy storage installed capacity, PDG,iFor distributed generation resource installed capacity；
Demand response capacity is than index R34Calculation method it is as follows：
Wherein, PDR,iFor demand response load power, PL,iFor load power, n is load number, and k is demand response load number.
7. the evaluation method of elasticity power distribution network flexibility according to claim 2, which is characterized in that the first class index Evaluation method is：According to the calculated value of two-level index and the weighted value of comprehensive expertise, linear weighted function summation is taken, is determined The flexibility score value of first class index evaluates the flexibility level of first class index.
CN201810652859.9A 2018-06-22 2018-06-22 A kind of evaluation method of elasticity power distribution network flexibility Pending CN108879659A (en)

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CN113807699A (en) * 2021-09-17 2021-12-17 陕西燃气集团新能源发展股份有限公司 Flexible operation evaluation method for power distribution network

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