CN113285446B - Transformer substation 10kV bus voltage optimization method - Google Patents

Transformer substation 10kV bus voltage optimization method Download PDF

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CN113285446B
CN113285446B CN202110521862.9A CN202110521862A CN113285446B CN 113285446 B CN113285446 B CN 113285446B CN 202110521862 A CN202110521862 A CN 202110521862A CN 113285446 B CN113285446 B CN 113285446B
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voltage
transformer
distribution
bus
low
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CN113285446A (en
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马春生
虞凡
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Nanjing Softcore Science & Technology 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
    • 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
    • H02J3/12—Circuit arrangements for ac mains or ac distribution networks for adjusting voltage in ac networks by changing a characteristic of the network load
    • 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
    • H02J3/12—Circuit arrangements for ac mains or ac distribution networks for adjusting voltage in ac networks by changing a characteristic of the network load
    • H02J3/16—Circuit arrangements for ac mains or ac distribution networks for adjusting voltage in ac networks by changing a characteristic of the network load by adjustment of reactive power
    • 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
    • H02J2203/10—Power transmission or distribution systems management focussing at grid-level, e.g. load flow analysis, node profile computation, meshed network optimisation, active network management or spinning reserve management
    • 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
    • Y02E40/00—Technologies for an efficient electrical power generation, transmission or distribution
    • Y02E40/30—Reactive power compensation

Abstract

The invention discloses a transformer substation 10kV bus voltage optimization method. The method comprises the following steps: searching feeder lines under the bus according to the topological connection relation of the power distribution network and distribution transformers under the feeder lines; calculating equivalent resistance of the feeder line, equivalent resistance of the distribution transformer and equivalent resistance of the low-voltage line; calculating the qualified duty ratio of the distribution transformer voltage and the distribution network loss under different bus voltages; giving bus voltage target values at different time slices. According to the invention, through optimizing the voltage of the 10kV bus, the voltage qualification rate of the power distribution network is improved, the loss of the power distribution network is reduced, the voltage regulating capability of the 10kV bus is fully utilized, and the voltage regulating cost of the power distribution network is reduced.

Description

Transformer substation 10kV bus voltage optimization method
Technical Field
The invention relates to the technical field of optimization of a 10kV bus voltage control target value, in particular to a substation 10kV bus voltage optimization method.
Background
Along with the closer connection between the production and life of people and electricity, the requirements on the electric energy quality are also increasing. The voltage amplitude is the most basic power quality indicator. Whether the voltage amplitude is within a qualified range directly affects daily production and life. The existing method for improving the voltage qualification rate of the distribution network generally adopts a switching method of distribution transformer gear shifting and reactive power compensation equipment in a transformer area. Because the regulation means of the transformer area is single, the prior method is not attractive in improving the voltage qualification rate of the users. Meanwhile, the regulation and control means of the transformer substation are more, and the voltage of a 10kV bus of the transformer substation directly influences the voltage of the distribution network. If the 10kV bus voltage can be optimized according to the requirement of the power distribution network, the purpose of improving the voltage qualification rate of the power distribution network can be achieved.
Under the background of the era of advocating energy conservation, environmental protection and sustainable development, the power distribution network is used as an important infrastructure for economic and social development, the energy loss of the power distribution network accounts for more than 70% of the loss of the whole power distribution network, and the purpose of controlling the economic operation of the power distribution network to achieve energy conservation and loss reduction is very important on the basis of improving the voltage qualification rate.
Currently, a 10kV bus voltage optimization strategy aiming at improving the voltage qualification rate of a power distribution network and saving energy of the power distribution network is lacking. Therefore, a 10kV bus voltage optimization strategy is needed to improve the voltage qualification rate of the power distribution network and reduce the power distribution network loss.
Disclosure of Invention
The invention aims to provide a 10kV bus voltage optimization method for a transformer substation, aiming at the defects existing in the prior art.
In order to achieve the purpose, the invention provides a transformer substation 10kV bus voltage optimization method, which comprises the following steps:
step 1, searching feeder lines under buses and distribution transformers under the feeder lines according to a topological connection relation of a power grid;
step 2, calculating equivalent resistance of a feeder line, equivalent resistance of a distribution transformer and equivalent resistance of a low-voltage line connected with the distribution transformer;
step 3, calculating the qualified duty ratio of the distribution transformer voltage and the distribution network loss under different bus voltages;
and 4, giving bus voltage target values under different time sections.
Further, the calculation mode of the equivalent resistance of the feeder line is as follows:
searching the length and unit length resistance data of the feeder line in the PMS system, and calculating the equivalent resistance R of the feeder line according to the load distribution coefficient of the feeder line eq ：
Wherein r is i Resistance per unit length of i-th section line, l i For the length of the ith section of line, N is the total number of line segments, k e Is a feeder load distribution coefficient.
Further, the calculation mode of the configuration transformer equivalent resistance is as follows:
wherein R is T Is to be matched with equivalent resistance, unit omega, delta P s Is short-circuit loss, unit kW, V N Rated voltage of high-voltage side of distribution transformer, unit kV, S N For the distribution rated capacity, kVA is a unit.
Further, the calculation mode of the qualified duty ratio of the distribution transformer voltage is as follows:
3.1.1 Distribution voltage calculation
After the bus voltage is regulated, the voltage of each subordinate distribution voltage changes in the same proportion, such as increasing the bus voltage by Au 10 kV, the distribution voltage is adjusted tou 0 The voltage value of the low-voltage side of the distribution transformer before the bus voltage is adjusted, and u' is the voltage value of the low-voltage side of the distribution transformer after the bus voltage is adjusted;
3.1.2 Distribution and transformation voltage check judgment
Judging whether the voltage of the low-voltage side of the distribution transformer after the bus voltage adjustment is qualified or not according to the voltage qualification range specified by the national standard;
3.1.3 Distribution transformer voltage qualification duty ratio calculation
Wherein alpha is the qualified duty ratio of the distribution transformer voltage, N 1 The voltage qualification number of the power transformer is adjusted for the bus voltage, N 0 The total number of the distribution transformer is the bus-bar subordinate.
Further, the calculation mode of the active loss of the distribution network is as follows:
3.2.1 Feeder loss calculation
I a ，I b ，I c Three-phase currents of feeder lines respectively, wherein the units are A and R eq Is equivalent resistance of feeder line, unit omega, delta P L1 The feed line loss is the unit kW;
3.2.2 Distribution and transformation loss calculation
ΔP T To match the loss, the unit is kW, P a For distributing the active power of the phase A at the low-voltage side of the transformer, the unit is kW, Q a For distributing the A-phase reactive power of the low-voltage side of the transformer, the unit is kvar, P b For distributing the B-phase active power of the low-voltage side of the transformer, the unit is kW, Q b For distributing the B-phase reactive power of the low-voltage side of the transformer, the unit is kvar, P c For distributing the C-phase active power of the low-voltage side of the transformer, the unit is kW, Q c For distributing the C-phase reactive power of the low-voltage side of the transformer, the unit is kvar, V a 、V b 、V c The three-phase voltages at the low-voltage side of the distribution transformer are respectively in kV and K units T In order to realize the transformation ratio of the distribution transformer,V 1N to match the voltage input at the high-voltage side, V 2N For the high-voltage side input voltage V 1N Voltage output by low voltage side R T Is a matched variable equivalent resistor with the unit of omega, G T In order to match the equivalent conductance of the transformer,
ΔP 0 is no-load loss, the unit is kW, V N To match the rated voltage of the high-voltage side, V h The voltage of the high-voltage side of the distribution transformer is in kV;
3.2.3 Low voltage line loss calculation
Wherein DeltaP L2 For low line loss, P a For distributing the active power of the phase A at the low-voltage side of the transformer, the unit is kW, Q a For distributing the A-phase reactive power of the low-voltage side of the transformer, the unit is kvar, P b For distributing the B-phase active power of the low-voltage side of the transformer, the unit is kW, Q b Is the reactive power of the low-voltage side B phase, and has the unit of kvar and P c For distributing the C-phase active power of the low-voltage side of the transformer, the unit is kW, Q c Is the reactive power of the low-voltage side C phase, and has the unit of kvar, V a 、V b 、V c The three-phase voltages at the low-voltage side of the distribution transformer are respectively in kV and R L Is equivalent resistance of a low-voltage circuit, and has the unit of omega and k N Is the ratio of the neutral line resistance to the phase line resistanceValue, I n Is neutral line current
Wherein,
is the real part of the A-phase current vector, ">For the imaginary part of the A-phase current vector, < >>Is the real part of B phase current vector, ">For the imaginary part of the B-phase current vector, < >>Is the real part of the C-phase current vector, ">For the imaginary part of the C-phase current vector, arcos (pf a )，arcos(pf b )，arcos(pf b ) The phase difference values are respectively the phase difference values between the three-phase current and the three-phase voltage, when the current phase lags behind the voltage, the phase difference value is positive, otherwise, the phase difference value takes a negative value;
active loss of distribution network=Δp L1 +ΔP T +ΔP L2 。
Further, the step 4 specifically includes:
4.1 Calculating the distribution transformer voltage, feeder line loss, distribution transformer loss and low-voltage line loss under different bus voltages in a range of 10.0kV to 10.7kV according to a set step length;
4.2 Calculating the voltage qualification ratio under different bus voltages, and summing the feeder line loss, the distribution transformer loss and the low-voltage line loss;
4.3 Selecting a bus voltage value with the highest qualified ratio of the distribution transformer voltage and the smallest total loss electric quantity as a bus voltage target value under the time section;
4.4 The bus voltage target value under each time section is calculated at fixed time.
Further, the set step size includes 0.1kV.
The beneficial effects are that: according to the invention, through optimizing the 10kV bus voltage, the voltage qualification rate of the power distribution network is improved, the power distribution network loss is reduced, the reactive power resources of a 10kV and above main power network are fully utilized, and the voltage regulation and control cost of the power distribution network is reduced.
Drawings
Fig. 1 is a schematic flow chart of a method for optimizing 10kV busbar voltage of a transformer substation according to an embodiment of the present invention.
Detailed Description
The invention will be further illustrated by the following drawings and specific examples, which are carried out on the basis of the technical solutions of the invention, it being understood that these examples are only intended to illustrate the invention and are not intended to limit the scope of the invention.
As shown in fig. 1, the embodiment of the invention provides a method for optimizing the voltage of a 10kV bus of a transformer substation, which comprises the following steps:
step 1, searching feeder lines under buses and distribution transformers under the feeder lines according to a topological connection relation of a power grid;
step 2, calculating equivalent resistance of a feeder line, equivalent resistance of a distribution transformer and equivalent resistance of a low-voltage line connected with the distribution transformer;
step 3, calculating the qualified duty ratio of the distribution transformer voltage and the distribution network loss under different bus voltages;
and 4, giving bus voltage target values under different time sections.
The calculation mode of the equivalent resistance of the feeder line is as follows:
searching the length and unit length resistance data of the feeder line in the PMS system, and calculating the equivalent resistance R of the feeder line according to the load distribution coefficient of the feeder line eq ：
Wherein r is i Resistance per unit length of i-th section line, l i For the length of the ith section of line, N is the total number of line segments, k e Is a feeder load distribution coefficient.
Specifically, the feeder load distribution coefficient k e According to different feeder load distribution values, the specific values can be seen in the following table:
the calculation mode of the distribution transformer equivalent resistor is as follows:
wherein R is T To be provided with variable equivalent resistance delta P s For short-circuit loss, V N For distributing the rated voltage of the high-voltage side, S N Rated capacity for the distribution transformer.
The calculation mode of the qualified duty ratio of the distribution transformer voltage is as follows:
3.1.1 Distribution voltage calculation
After the bus voltage is regulated, the voltage of each subordinate distribution transformer changes in the same proportion, such as the increase of the bus voltage delta u 10 kV, the distribution voltage is adjusted tou 0 The voltage value of the low-voltage side of the distribution transformer before the bus voltage is adjusted, and u' is the voltage value of the low-voltage side of the distribution transformer after the bus voltage is adjusted;
3.1.2 Distribution and transformation voltage check judgment
Judging whether the voltage of the low-voltage side of the distribution transformer after the bus voltage adjustment is qualified or not according to the voltage qualification range specified by the national standard;
3.1.3 Distribution transformer voltage qualification duty ratio calculation
Wherein alpha is the qualified duty ratio of the distribution transformer voltage, N 1 The voltage qualification number of the power transformer is adjusted for the bus voltage, N 0 The total number of the distribution transformer is the bus-bar subordinate.
The calculation mode of the active loss of the distribution network is as follows:
3.2.1 Feeder loss calculation
I a ，I b ，I c Three-phase currents of feeder lines respectively, wherein the units are A and R eq Equivalent resistance for feeder lineUnits Ω, Δp L1 The feed line loss is the unit kW;
3.2.2 Distribution and transformation loss calculation
ΔP T To match the loss, the unit is kW, P a For distributing the active power of the phase A at the low-voltage side of the transformer, the unit is kW, Q a For distributing the A-phase reactive power of the low-voltage side of the transformer, the unit is kvar, P b For distributing the B-phase active power of the low-voltage side of the transformer, the unit is kW, Q b For distributing the B-phase reactive power of the low-voltage side of the transformer, the unit is kvar, P c For distributing the C-phase active power of the low-voltage side of the transformer, the unit is kW, Q c For distributing the C-phase reactive power of the low-voltage side of the transformer, the unit is kvar, V a 、V b 、V c The three-phase voltages at the low-voltage side of the distribution transformer are respectively in kV and K units T In order to realize the transformation ratio of the distribution transformer,V 1N to match the voltage input at the high-voltage side, V 2N For the high-voltage side input voltage V 1N Voltage output by low voltage side R T Is a matched variable equivalent resistor with the unit of omega, G T For matching variable equivalent conductance->ΔP 0 Is no-load loss, the unit is kW, V N Rated voltage of high-voltage side of distribution transformer, unit kV, V h The voltage of the high-voltage side of the distribution transformer is in kV;
3.2.3 Low voltage line loss calculation
Wherein DeltaP L2 For low line loss, P a For distributing the active power of the phase A at the low-voltage side of the transformer, the unit is kW, Q a For distributing the A-phase reactive power of the low-voltage side of the transformer, the unit is kvar, P b Is matched withLow-voltage side B-phase active power, with the unit of kW, Q b Is the reactive power of the low-voltage side B phase, and has the unit of kvar and P c For distributing the C-phase active power of the low-voltage side of the transformer, the unit is kW, Q c Is the reactive power of the low-voltage side C phase, and has the unit of kvar, V a 、V b 、V c The three-phase voltages at the low-voltage side of the distribution transformer are respectively in kV and R L Is equivalent resistance of a low-voltage circuit, and has the unit of omega and k N Is the ratio of the neutral line resistance to the phase line resistance, I n Is neutral line current
Wherein,
is the real part of the A-phase current vector, ">For the imaginary part of the A-phase current vector, < >>Is the real part of B phase current vector, ">For the imaginary part of the B-phase current vector, < >>Is the real part of the C-phase current vector, ">For the imaginary part of the C-phase current vector, arcos (pf a )，arcos(pf b )，arcos(pf b ) The phase difference values are respectively the phase difference values between the three-phase current and the three-phase voltage, when the current phase lags behind the voltage, the phase difference value is positive, otherwise, the phase difference value takes a negative value;
active loss of distribution network=Δp L1 +ΔP T +ΔP L2 。
The step 4 specifically comprises the following steps:
4.1 Calculating the distribution transformer voltage, feeder line loss, distribution transformer loss and low-voltage line loss under different bus voltages in a range of 10.0kV to 10.7kV according to a set step length. The set step size comprises 0.1kV.
4.2 Calculating the voltage qualification ratio under different bus voltages, and summing the feeder line loss, the distribution transformer loss and the low-voltage line loss.
4.3 And selecting a bus voltage value with the highest qualified ratio of the distribution transformer voltage and the smallest total loss electric quantity as a bus voltage target value under the time section.
4.4 The bus voltage target value under each time section is calculated at fixed time.
The foregoing is merely a preferred embodiment of the present invention, and it should be noted that other parts not specifically described are within the prior art or common general knowledge to a person of ordinary skill in the art. Modifications and alterations may be made without departing from the principles of this invention, and such modifications and alterations should also be considered as being within the scope of the invention.

Claims (3)

1. The method for optimizing the voltage of the 10kV bus of the transformer substation is characterized by comprising the following steps of:
step 1, searching feeder lines under buses and distribution transformers under the feeder lines according to a topological connection relation of a power grid;
step 2, calculating equivalent resistance of a feeder line, equivalent resistance of a distribution transformer and equivalent resistance of a low-voltage line connected with the distribution transformer;
step 3, calculating the qualified duty ratio of the distribution transformer voltage and the distribution network loss under different bus voltages;
step 4, giving bus voltage target values under different time sections;
the calculation mode of the equivalent resistance of the feeder line is as follows:
searching the length and unit length resistance data of the feeder line in the PMS system, and calculating the equivalent resistance R of the feeder line according to the load distribution coefficient of the feeder line eq ：
Wherein r is i Resistance per unit length of i-th section line, l i For the length of the ith section of line, N is the total number of line segments, k e The load distribution coefficient is the feeder line load distribution coefficient;
the calculation mode of the distribution transformer equivalent resistor is as follows:
wherein R is T Is to be matched with equivalent resistance, unit omega, delta P s Is short-circuit loss, unit kW, V N Rated voltage of high-voltage side of distribution transformer, unit kV, S N The unit kVA is the rated capacity of the distribution transformer;
the calculation mode of the qualified duty ratio of the distribution transformer voltage is as follows:
3.1.1 Distribution voltage calculation
After the bus voltage is regulated, the voltage of each subordinate distribution transformer changes in the same proportion, such as the increase of the bus voltage delta u 10 kV, the distribution voltage is adjusted tou 0 The voltage value of the low-voltage side of the distribution transformer before the bus voltage is adjusted, and u' is the voltage value of the low-voltage side of the distribution transformer after the bus voltage is adjusted;
3.1.2 Distribution and transformation voltage check judgment
Judging whether the voltage of the low-voltage side of the distribution transformer after the bus voltage adjustment is qualified or not according to the voltage qualification range specified by the national standard;
3.1.3 Distribution transformer voltage qualification duty ratio calculation
Wherein alpha is the qualified duty ratio of the distribution transformer voltage, N 1 The voltage qualification number of the power transformer is adjusted for the bus voltage, N 0 The total number of the distribution transformers is the bus subordinate;
the calculation mode of the active loss of the distribution network is as follows:
3.2.1 Feeder loss calculation
I a ，I b ，I c Three-phase currents of feeder lines respectively, wherein the units are A and R eq Is equivalent resistance of feeder line, unit omega, delta P L1 The feed line loss is the unit kW;
3.2.2 Distribution and transformation loss calculation
ΔP T To match the loss, the unit is kW, P a For distributing the active power of the phase A at the low-voltage side of the transformer, the unit is kW, Q a For distributing the A-phase reactive power of the low-voltage side of the transformer, the unit is kvar, P b For distributing the B-phase active power of the low-voltage side of the transformer, the unit is kW, Q b For distributing the B-phase reactive power of the low-voltage side of the transformer, the unit is kvar, P c For distributing the C-phase active power of the low-voltage side of the transformer, the unit is kW, Q c For distributing the C-phase reactive power of the low-voltage side of the transformer, the unit is kvar, V a 、V b 、V c The three-phase voltages at the low-voltage side of the distribution transformer are respectively in kV and K units T In order to realize the transformation ratio of the distribution transformer,V 1N to match the voltage input at the high-voltage side, V 2N For the high-voltage side input voltage V 1N Voltage output by low voltage side R T Is a matched variable equivalent resistor with the unit of omega, G T In order to match the equivalent conductance of the transformer,
ΔP 0 is no-load loss, the unit is kW, V N To match the rated voltage of the high-voltage side, V h The voltage of the high-voltage side of the distribution transformer is in kV;
3.2.3 Low voltage line loss calculation
Wherein DeltaP L2 For low line loss, R L Is equivalent resistance of a low-voltage circuit, and has the unit of omega and k N Is the ratio of the neutral line resistance to the phase line resistance, I n Is neutral line current
Wherein,
is the real part of the A-phase current vector, ">For the imaginary part of the A-phase current vector, < >>Is the real part of B phase current vector, ">For the imaginary part of the B-phase current vector, < >>Is the real part of the C-phase current vector, ">For the imaginary part of the C-phase current vector, arcos (pf a )，arcos(pf b )，arcos(pf b ) The phase difference values are respectively the phase difference values between the three-phase current and the three-phase voltage, when the current phase lags behind the voltage, the phase difference value is positive, otherwise, the phase difference value takes a negative value;
active loss of distribution network=Δp L1 +ΔP T +ΔP L2 。
2. The method for optimizing the voltage of the 10kV bus of the transformer substation according to claim 1, wherein the step 4 specifically includes:
4.1 Calculating the distribution transformer voltage, feeder line loss, distribution transformer loss and low-voltage line loss under different bus voltages in a range of 10.0kV to 10.7kV according to a set step length;
4.2 Calculating the voltage qualification ratio under different bus voltages, and summing the feeder line loss, the distribution transformer loss and the low-voltage line loss;
4.3 Selecting a bus voltage value with the highest qualified ratio of the distribution transformer voltage and the smallest total loss electric quantity as a bus voltage target value under the time section;
4.4 The bus voltage target value under each time section is calculated at fixed time.
3. The substation 10kV busbar voltage optimization method according to claim 2, wherein the set step size includes 0.1kV.
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CN102710022A (en) * 2012-06-13 2012-10-03 南京软核科技有限公司 Power distribution network feeder protection and reconfiguration scheme based on intelligent feeder terminal unit
CN103746388A (en) * 2014-01-16 2014-04-23 南京软核科技有限公司 Electric distribution network reactive-voltage three-level coordination control method
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