CN111835019A - Energy efficiency evaluation method of dynamic reactive power compensation device of distribution network area - Google Patents

Energy efficiency evaluation method of dynamic reactive power compensation device of distribution network area Download PDF

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CN111835019A
CN111835019A CN202010747853.7A CN202010747853A CN111835019A CN 111835019 A CN111835019 A CN 111835019A CN 202010747853 A CN202010747853 A CN 202010747853A CN 111835019 A CN111835019 A CN 111835019A
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loss
reactive power
compensation device
power compensation
distribution network
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陈春
彭禹尧
曹一家
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Changsha University of Science and Technology
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    • HELECTRICITY
    • H02GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02JCIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
    • H02J3/00Circuit arrangements for ac mains or ac distribution networks
    • H02J3/18Arrangements for adjusting, eliminating or compensating reactive power in networks
    • GPHYSICS
    • G06COMPUTING; CALCULATING OR COUNTING
    • G06QINFORMATION 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
    • G06Q10/00Administration; Management
    • G06Q10/06Resources, workflows, human or project management; Enterprise or organisation planning; Enterprise or organisation modelling
    • G06Q10/063Operations research, analysis or management
    • G06Q10/0639Performance analysis of employees; Performance analysis of enterprise or organisation operations
    • G06Q10/06393Score-carding, benchmarking or key performance indicator [KPI] analysis
    • GPHYSICS
    • G06COMPUTING; CALCULATING OR COUNTING
    • G06QINFORMATION 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
    • G06Q50/00Systems or methods specially adapted for specific business sectors, e.g. utilities or tourism
    • G06Q50/06Electricity, gas or water supply
    • HELECTRICITY
    • H02GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02JCIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
    • H02J3/00Circuit arrangements for ac mains or ac distribution networks
    • H02J3/26Arrangements for eliminating or reducing asymmetry in polyphase networks
    • HELECTRICITY
    • H02GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02JCIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
    • H02J2203/00Indexing scheme relating to details of circuit arrangements for AC mains or AC distribution networks
    • H02J2203/20Simulating, e g planning, reliability check, modelling or computer assisted design [CAD]
    • YGENERAL 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
    • Y02TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02EREDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E40/00Technologies for an efficient electrical power generation, transmission or distribution
    • Y02E40/30Reactive power compensation
    • YGENERAL 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
    • Y02TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02EREDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E40/00Technologies for an efficient electrical power generation, transmission or distribution
    • Y02E40/50Arrangements for eliminating or reducing asymmetry in polyphase networks
    • YGENERAL 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
    • Y02TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02EREDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E40/00Technologies for an efficient electrical power generation, transmission or distribution
    • Y02E40/70Smart grids as climate change mitigation technology in the energy generation sector
    • YGENERAL 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
    • Y02TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02PCLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
    • Y02P90/00Enabling technologies with a potential contribution to greenhouse gas [GHG] emissions mitigation
    • Y02P90/80Management or planning
    • Y02P90/82Energy audits or management systems therefor
    • YGENERAL 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
    • Y04INFORMATION OR COMMUNICATION TECHNOLOGIES HAVING AN IMPACT ON OTHER TECHNOLOGY AREAS
    • Y04SSYSTEMS 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
    • Y04S10/00Systems supporting electrical power generation, transmission or distribution
    • Y04S10/50Systems 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 an energy efficiency evaluation method of a dynamic reactive power compensation device of a distribution network area, which comprises the following steps: acquiring real-time data of three-phase voltage and current of a distribution network area before a dynamic reactive power compensation device is installed; calculating line loss, transformer loss and total grid loss rate according to the collected three-phase voltage and current; collecting real-time data of three-phase voltage and current of a distribution network area after a dynamic reactive power compensation device is installed; calculating the line loss, the transformer loss and the total network loss rate after reactive compensation according to the collected three-phase voltage and current; and calculating the electricity saving amount after the dynamic reactive power compensation device is installed, and evaluating the treatment effect. The invention is based on the real-time operation parameters of the power grid, fully considers the loss of the SVG device, can quickly evaluate the energy efficiency of the dynamic reactive power compensation device of the distribution network region, is beneficial to reasonably configuring reactive power compensation equipment and ensures the power quality.

Description

Energy efficiency evaluation method of dynamic reactive power compensation device of distribution network area
Technical Field
The invention relates to an energy efficiency evaluation method of a reactive power compensation device, in particular to an energy efficiency evaluation method of a dynamic reactive power compensation device of a distribution network area.
Background
In a distribution area, the reasonable configuration of reactive compensation equipment in a power grid is closely related to the quality of the power supply voltage of the power grid, when the voltage is low, the power loss and the energy loss in the system are increased, and when the voltage is too low, the power supply quality of a user is seriously influenced, and the industrial production and the life of residents are influenced; when the voltage is too high, insulation of various electrical devices may be damaged. Therefore, the energy efficiency of the dynamic reactive power compensation device in the distribution network area needs to be evaluated, so that the reactive power compensation equipment is reasonably configured, the quality of electric energy is guaranteed, the standard of safe operation is achieved, the requirements of users are met, and an effective energy efficiency evaluation method is absent at present.
Disclosure of Invention
In order to solve the technical problems, the invention provides a stable, quick and efficient energy efficiency evaluation method for a dynamic reactive power compensation device of a distribution network area.
The technical scheme for solving the problems comprises the following steps:
step 001: acquiring real-time data of three-phase voltage and current of a distribution network area before a dynamic reactive power compensation device is installed;
step 002: calculating line loss, transformer loss and total grid loss rate according to the three-phase voltage and current acquired in the step 001;
step 003: collecting real-time data of three-phase voltage and current of a distribution network area after a dynamic reactive power compensation device is installed;
step 004: calculating the line loss, the transformer loss and the total grid loss rate after reactive compensation according to the three-phase voltage and current collected in the step 003;
step 005: and calculating the electricity saving amount after the dynamic reactive power compensation device is installed, and evaluating the treatment effect.
The invention has the technical effects that: the invention is based on the real-time operation parameters of the power grid, fully considers the loss of the SVG device, can quickly and efficiently evaluate the energy efficiency of the dynamic reactive power compensation device of the distribution network region, is beneficial to reasonably configuring reactive power compensation equipment, ensures the power quality and reaches the standard of safe operation.
Drawings
Fig. 1 is a schematic diagram of SVG three-phase imbalance and reactive power compensation in the present invention.
FIG. 2 is a flow chart of the present invention.
Detailed Description
The invention is described in further detail below with reference to the figures and the specific embodiments.
As shown in fig. 1, fig. 1 is an electrical schematic diagram of SVG three-phase imbalance and reactive compensation, and fig. 2 is a flow chart of the invention. The energy efficiency evaluation method of the dynamic reactive power compensation device of the distribution network area comprises the following steps:
step 001: acquiring real-time data of three-phase voltage and current of a distribution network area before a dynamic reactive power compensation device is installed; the reactive power compensation device is not installed, the three-phase voltage and the current In the distribution network area are In an unbalanced state, the three-phase unbalanced current is Ia, Ib and Ic, the neutral line current is In, and the relation between the phase line current and the neutral line current is as follows:
Figure BDA0002608964360000021
step 002: and calculating the line loss, the transformer loss and the total grid loss rate according to the three-phase voltage and current acquired in the step 001.
Line loss: resistance R of each phase lineLSimilarly, if the neutral resistance is 2 times the phase resistance, the active loss of the line is:
Figure BDA0002608964360000031
in the formula,. DELTA.PL1The unit is kW; ia, Ib and Ic are A.
The transformer copper loss is:
Figure BDA0002608964360000032
in the formula,. DELTA.PT1The unit is Kw, RfIs the coil resistance.
When the three-phase is unbalanced, the total loss of the system is as follows:
△P1=△PL1+△PT1
the total power output by the distribution transformer is as follows:
P1=Pa+Pb+Pc+△P1
the total network loss rate is:
Figure BDA0002608964360000033
in the above formula, Tmax is the maximum load utilization hours, and is generally 4500h, τ is the maximum load loss time, and is generally 4500 h.
Step 003: collecting real-time data of three-phase voltage and current of a distribution network area after a dynamic reactive power compensation device is installed; after the dynamic reactive power compensation device is installed, the three phases are balanced, the currents flowing through the phase lines are equal, and if the load value is not changed, the currents of the phase lines are changed to (Ia + Ib + Ic)/3 from the previous values of Ia, Ib and Ic.
Step 004: and calculating the line loss, the transformer loss and the total grid loss rate after reactive compensation according to the three-phase voltage and current collected in the step 003.
The line loss is:
Figure BDA0002608964360000034
in the formula,. DELTA.PL2The unit is kW; ia, Ib and Ic are A.
The transformer copper loss is:
Figure BDA0002608964360000041
in the formula,. DELTA.PT2In kW, RfIs the transformer coil resistance.
The SVG device can produce certain loss, and the efficiency of device is 98%, and the loss that a SVG increased is:
△Pe=160×(1-98%)
when three phases are balanced, the total loss of the system is as follows:
△P2=△PL2+△PT2+△Pe
the total power of the distribution transformer output is as follows:
P2=Pa+Pb+Pc+△P2
the net loss rate is:
Figure BDA0002608964360000042
in the above formula, Tmax is the maximum load utilization hours, and is generally 4500h, τ is the maximum load loss time, and is generally 4500 h.
Step 005: and calculating the electricity saving amount after the dynamic reactive power compensation device is installed, and evaluating the treatment effect.
Calculation of phase imbalance treatment effect
The line loss that reduces after unbalanced three phase administers is:
△PL=△PL1-△PL2
the distribution transformer loss reduced after three-phase unbalance treatment is as follows:
△PT=△PT1-△PT2
the total loss reduced after three-phase unbalance treatment is as follows:
△P=△P1-△P2=△PL+△PT
the total network loss rate reduced after three-phase unbalance treatment is as follows:
△η=η12
the annual electric quantity saving of the reactive power compensation device is calculated as follows:
△(△E)=(Qc×C-Qc×tg)×τmax
in the formula, QcThe unit of the capacity value which is fully input for reactive compensation is kVar; c is reactive economic equivalent, and the value of C is 0.1; tg is the dielectric loss tangent value of the capacitor, the value range is 0.0005-0.0012, and τ maxThe equivalent running time of the reactive power compensation device under the condition of maximum power saving is expressed in hours.
The following table 1 is the collected specific case data, and the tables 2 to 7 are the calculation tables of the three-phase imbalance treatment effect.
Table 1 shows the specific case data collected
Figure BDA0002608964360000051
Table 2 case 1 calculation table of three-phase imbalance treatment effect
Figure BDA0002608964360000052
Table 3 case 2 calculation table for three-phase unbalance treatment effect
Figure BDA0002608964360000061
Table 4 case 3 table for calculating three-phase unbalance treatment effect
Figure BDA0002608964360000062
Table 5 case 4 calculation table for three-phase unbalance treatment effect
Figure BDA0002608964360000063
Figure BDA0002608964360000071
Table 6 case 5 table for calculating three-phase unbalance treatment effect
Figure BDA0002608964360000072
Table 7 case 6 table for calculating three-phase unbalance treatment effect
Figure BDA0002608964360000073

Claims (8)

1. An energy efficiency evaluation method for a dynamic reactive power compensation device of a distribution network area comprises the following steps:
step 001: acquiring real-time data of three-phase voltage and current of a distribution network area before a dynamic reactive power compensation device is installed;
step 002: calculating line loss, transformer loss and total grid loss rate according to the three-phase voltage and current acquired in the step 001;
step 003: collecting real-time data of three-phase voltage and current of a distribution network area after a dynamic reactive power compensation device is installed;
step 004: calculating the line loss, the transformer loss and the total grid loss rate after reactive compensation according to the three-phase voltage and current collected in the step 003;
step 005: and calculating the electricity saving amount after the dynamic reactive power compensation device is installed, and evaluating the treatment effect.
2. The method for evaluating the energy efficiency of the dynamic reactive power compensation device of the distribution network area according to claim 1, wherein in the step 002, when the three phases are unbalanced, the active loss Δ P of the line isL1Comprises the following steps:
Figure FDA0002608964350000011
in the formula, Ia, Ib and Ic are three-phase voltage and current respectively, RLA phase line resistor;
copper consumption delta P of transformerT1Comprises the following steps:
Figure FDA0002608964350000012
in the formula RfIs a transformer coil resistance;
the total system loss is:
△P1=△PL1+△PT1
3. the energy efficiency evaluation method of the distribution network district dynamic reactive power compensation device according to claim 2, wherein in the step 002, the total power output by the distribution transformer is:
P1=Pa+Pb+Pc+△P1
△P1for total loss of the line, Pa,Pb,PcThree-phase active power.
4. The energy efficiency evaluation method of the distribution network district dynamic reactive power compensation device according to claim 3, wherein the network loss rate in step 002 is:
Figure FDA0002608964350000021
in the above formula, Tmaxτ is the maximum load loss time, the number of hours of maximum load utilization.
5. The energy efficiency assessment method for distribution network district dynamic reactive power compensation device according to claim 1, wherein in the step 004, the line loss Δ PL2Comprises the following steps:
Figure FDA0002608964350000022
the transformer copper loss is:
Figure FDA0002608964350000023
6. the energy efficiency evaluation method of the distribution network platform dynamic reactive power compensation device according to claim 1, wherein in the step 004, the extra loss caused by installing the SVG device is as follows:
△Pe=160×(1-98%)
the total system loss is:
△P2=△PL2+△PT2+△Pe
the total power of the distribution transformer output is as follows:
P2=Pa+Pb+Pc+△P2
7. the energy efficiency evaluation method of the distribution network district dynamic reactive power compensation device according to claim 1, wherein in the step 004, the network loss rate is:
Figure FDA0002608964350000031
in the above formula, Tmaxτ is the maximum load loss time, the number of hours of maximum load utilization.
8. The energy efficiency evaluation method of the distribution network district dynamic reactive power compensation device according to claim 7, wherein the line loss reduced after the three-phase imbalance management in the step 005 is:
△PL=△PL1-△PL2
the distribution transformer loss reduced after three-phase unbalance treatment is as follows:
△PT=△PT1-△PT2
the total loss reduced after three-phase unbalance treatment is as follows:
△P=△P1-△P2=△PL+△PT
the total network loss rate reduced after three-phase unbalance treatment is as follows:
△η=η12
CN202010747853.7A 2020-07-30 2020-07-30 Energy efficiency evaluation method of dynamic reactive power compensation device of distribution network area Pending CN111835019A (en)

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