CN104700325A - Power distribution network stability evaluation method - Google Patents

Power distribution network stability evaluation method Download PDF

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Publication number
CN104700325A
CN104700325A CN201510143010.5A CN201510143010A CN104700325A CN 104700325 A CN104700325 A CN 104700325A CN 201510143010 A CN201510143010 A CN 201510143010A CN 104700325 A CN104700325 A CN 104700325A
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China
Prior art keywords
power
rate
distribution network
circuit
line
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Application number
CN201510143010.5A
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Chinese (zh)
Inventor
李鹏
黄泽华
李锰
王利利
蒋小亮
杨卓
关朝杰
丁岩
郭璞
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国家电网公司
国网河南省电力公司经济技术研究院
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Priority to CN201510143010.5A priority Critical patent/CN104700325A/en
Publication of CN104700325A publication Critical patent/CN104700325A/en

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Abstract

The invention provides a power distribution network stability evaluation method. The evaluation contents of the method include a line re-overload rate, a distribution transform re-overload rate, a power network automatic coverage rate, a typical connection ratio, a line ring network rate, the percent of pass of the distribution transform capacity of connection of each line, a line insulation rate, user mean power failure time, a supply rate under power failure and an integrated voltage percent of pass; comprehensive consideration is performed for multiple goals of power distribution network development and stability evaluation is realized by virtue of weight calculation; as a result, regulation and control on the power grid performed under better guidance.

Description

Power distribution network method for estimating stability
Technical field
The present invention relates to the technical field that a kind of power distribution network is evaluated, particularly a kind of evaluation method of power distribution network stability.
Background technology
Power distribution network be contact user with send out, the intermediate link of transmission system, be ensure as user provides the important ring of high-quality, high reliability electric energy.The more international advanced power distribution network of China's power distribution network development level still has larger gap, and urban power distribution network development still exists more problem, is mainly manifested in the following aspects:
(1) distribution net work structure is weak, and backward in technique, power supply reliability is not high.China's power distribution network reliability still has larger room for promotion.
(2) comprehensive line loss per unit is high, and resource utilization is lower.Because distribution net work structure is unreasonable, the distribution transforming of high damage, still in a large amount of use, causes China's power distribution network synthesis line loss per unit higher.
(3) urban land resource is nervous, and environmental requirement improves day by day.Along with urban development and expansion, land resource growing tension, cause substation site selection, line channel corridor select difficulty continue to increase, the contradiction between power supply facilities and environmental resource is being aggravated gradually.Therefore need badly and improve plant factor in distribution network construction process, more focus on the coordination between power distribution network development and environment.
Power consumer requires to improve constantly to power quality issues, needs to provide higher-quality electric energy by distribution network construction; With expanding economy, resource utilization issue highlights, the energy-conserving and environment-protective more of society need power distribution network, the distribution system of built environment friendly; And electric power enterprise needs to improve self benefit, reduce operating cost, improve income.In the face of the multiple target of power distribution network development, how development construction needs comprehensive consideration to power distribution network, to realize the maximization of interests, obtains the effect of win-win.
Summary of the invention
Based on prior art Problems existing, a kind of power distribution network method for estimating stability is provided, power distribution network estimation of stability is according to every electric power network technique parameter, can turn the power grid security of power distribution network, power supply capacity, power supply reliability, power failure and be analyzed for all technical such as rate, user side rate of qualified voltage, find out difference and analyze its reason.To the effect of electrical network after analysis project is constructed and put into operation, analyzes the impact of this project for reorganization and expansion in the future, and sum up experience and lessons.
The heavy Overflow RateHT of l, circuit
The heavy Overflow RateHT of circuit is the important indicator in power distribution network appraisement system, and it directly reflects the running status of power distribution network.Circuit heavily transships and affects electric power netting safe running, and harm equipment use level, affects electric network reliability level simultaneously, reduces circuit and turns power supply level, need strictly to control.
2, the heavy Overflow RateHT of distribution transforming
The heavy Overflow RateHT of distribution transforming directly reflects the running status of substation transformer, is directly connected to voltage levvl and power supply safety.
3, distribution automation coverage rate
Realize distribution automation construction, the fault outage time can be shortened, improve power supply reliability and service quality; Improve the operation and management level of distribution and reduce line loss level; Meet multi-level user's request, and then adapt to the developing direction of urban distribution network.
4, typical wiring ratio
The structure of medium voltage distribution network is mainly reflected on the Connection Mode of 10kV circuit, connections pattern directly has influence on the power supply reliability of system and the power quality of user, therefore adopt rational Connection Mode both can improve the power supply quality of system to a great extent, good social and economic effects can be obtained again.Distribution network planning and one of the standardization of construction, normalized key index are weighed in the promotion efficiency of 10kV typical wiring ratio reflection typical wiring.
5, line looped network rate
Strengthen line looped networkization to build and transformation, improve looped network rate, optimize looped network level, can power supply reliability be improved, strengthen.
6, every bar circuit access capacity of distribution transform qualification rate
The factors such as the attaching capacity of distribution transform of circuit and circuit maximum carrying capacity, economic current density, protection requirement, connections pattern, load character, load simultaneity factor are closely related, and the whether reasonable reliability to operation of power networks of circuit attaching capacity of distribution transform and economy all have a significant impact.Consider that the reference capacity of every bar circuit access substation transformer controls by 3000 ~ 12000kvA.
7, line insulation rate
The coming into operation of insulated circuit can be reduced because foreign object causes the probability of line fault, improves power supply reliability, solves the contradiction of power construction and municipal landscape construction.
8, the average power off time of user
The average power off time of user is the main aspect investigating power supply reliability.For user side, the length of power off time is the principal element to power grid construction satisfaction, is also factor the most intuitively.
9, power failure can turn for rate
Power failure can turn supply line and be defined as: under having the circuit of communication relationship to be in the peak load method of operation simultaneously, when transformer station's outlet switch on certain loop line road is stopped transport, its whole load is by being no more than twice turn of powered operation, turn and powered by All other routes, so this circuit is called and can turns supply line.This definition stresses Connection Mode and the load condition of considering circuit from distribution aspect, and completes load transfer under limited number of time (being no more than twice) turns powered operation.
10, integrated voltage qualification rate
Integrated voltage qualification rate is the mean value of each backbone point rate of qualified voltage that dispatching of power netwoks is administered, and is the important indicator of the examination quality of power supply, reflects the probability that voltage fluctuates within the scope of permissible variation.
The method for estimating stability of power distribution network is embodied by the weight coefficient of evaluation index, and weight coefficient refers to the percentage contribution of indices to general objective, is used to the instrument of the relative importance size of portraying between evaluation index.When being evaluated object and evaluation index all determines, the result of comprehensive evaluation just depends on weight coefficient, can say, the whether reasonable credibility being directly connected to evaluation result of weight setting.
The computing method of weight are as follows:
(1) ambiguity function development of judgment matrix is utilized
It is defined as follows: establish ( represent the space that ambiguity function is formed), then the membership function of M , can be expressed as
In formula, , l and u is respectively the upper bound and lower bound that M supports, and title M is fuzzy number, and fuzzy number can be written as M=(l, m, u), reflect the size of blur level, i.e. fuzzy judgment matrix in element be one with for the closed interval of intermediate value.
When index set in appraisement system is time, the significance level that index contrasts between two can be obtained, be expressed as:
Here be fuzzy number
(2) fuzzy number related algorithm parameter weight is utilized
1) each index comprehensive synthesis fuzzy number is calculated
Wherein,
2) calculate possibility
If for possibility, l, m, u represent three parameters of fuzzy number, then
D is the peak that two fuzzy number subordinate functions occur simultaneously, and obtains be greater than the possibility of every other all index composite values.
3) parameter weight
If , then weight vectors can be expressed as , after it is normalized, criteria weights vector can be obtained .
Accompanying drawing explanation
Fig. 1 is power distribution network estimation of stability content
Fig. 2 is power distribution network estimation of stability weighing computation method.
Embodiment
As shown in Figure 1, a kind of power distribution network method for estimating stability, power distribution network estimation of stability is according to every electric power network technique parameter, can turn the power grid security of power distribution network, power supply capacity, power supply reliability, power failure and be analyzed for all technical such as rate, user side rate of qualified voltage, find out difference and analyze its reason.To the effect of electrical network after analysis project is constructed and put into operation, analyzes the impact of this project for reorganization and expansion in the future, and sum up experience and lessons.
The heavy Overflow RateHT of l, circuit
The heavy Overflow RateHT of circuit is the important indicator in power distribution network appraisement system, and it directly reflects the running status of power distribution network.Circuit heavily transships and affects electric power netting safe running, and harm equipment use level, affects electric network reliability level simultaneously, reduces circuit and turns power supply level, need strictly to control.
2, the heavy Overflow RateHT of distribution transforming
The heavy Overflow RateHT of distribution transforming directly reflects the running status of substation transformer, is directly connected to voltage levvl and power supply safety.
3, distribution automation coverage rate
Realize distribution automation construction, the fault outage time can be shortened, improve power supply reliability and service quality; Improve the operation and management level of distribution and reduce line loss level; Meet multi-level user's request, and then adapt to the developing direction of urban distribution network.
4, typical wiring ratio
The structure of medium voltage distribution network is mainly reflected on the Connection Mode of 10kV circuit, connections pattern directly has influence on the power supply reliability of system and the power quality of user, therefore adopt rational Connection Mode both can improve the power supply quality of system to a great extent, good social and economic effects can be obtained again.Distribution network planning and one of the standardization of construction, normalized key index are weighed in the promotion efficiency of 10kV typical wiring ratio reflection typical wiring.
5, line looped network rate
Strengthen line looped networkization to build and transformation, improve looped network rate, optimize looped network level, can power supply reliability be improved, strengthen.
6, every bar circuit access capacity of distribution transform qualification rate
The factors such as the attaching capacity of distribution transform of circuit and circuit maximum carrying capacity, economic current density, protection requirement, connections pattern, load character, load simultaneity factor are closely related, and the whether reasonable reliability to operation of power networks of circuit attaching capacity of distribution transform and economy all have a significant impact.Consider that the reference capacity of every bar circuit access substation transformer controls by 3000 ~ 12000kvA.
7, line insulation rate
The coming into operation of insulated circuit can be reduced because foreign object causes the probability of line fault, improves power supply reliability, solves the contradiction of power construction and municipal landscape construction.
8, the average power off time of user
The average power off time of user is the main aspect investigating power supply reliability.For user side, the length of power off time is the principal element to power grid construction satisfaction, is also factor the most intuitively.
9, power failure can turn for rate
Power failure can turn supply line and be defined as: under having the circuit of communication relationship to be in the peak load method of operation simultaneously, when transformer station's outlet switch on certain loop line road is stopped transport, its whole load is by being no more than twice turn of powered operation, turn and powered by All other routes, so this circuit is called and can turns supply line.This definition stresses Connection Mode and the load condition of considering circuit from distribution aspect, and completes load transfer under limited number of time (being no more than twice) turns powered operation.
10, integrated voltage qualification rate
Integrated voltage qualification rate is the mean value of each backbone point rate of qualified voltage that dispatching of power netwoks is administered, and is the important indicator of the examination quality of power supply, reflects the probability that voltage fluctuates within the scope of permissible variation.
The method for estimating stability of power distribution network is embodied by the weight coefficient of evaluation index, and weight coefficient refers to the percentage contribution of indices to general objective, is used to the instrument of the relative importance size of portraying between evaluation index.When being evaluated object and evaluation index all determines, the result of comprehensive evaluation just depends on weight coefficient, can say, the whether reasonable credibility being directly connected to evaluation result of weight setting.
As shown in Figure 2, the computing method of weight are as follows:
(1) ambiguity function development of judgment matrix is utilized
It is defined as follows: establish ( represent the space that ambiguity function is formed), then the membership function of M , can be expressed as
In formula, , l and u is respectively the upper bound and lower bound that M supports, and title M is fuzzy number, and fuzzy number can be written as M=(l, m, u), reflect the size of blur level, i.e. fuzzy judgment matrix in element be one with for the closed interval of intermediate value.
When index set in appraisement system is time, the significance level that index contrasts between two can be obtained, be expressed as:
Here be fuzzy number
(2) fuzzy number related algorithm parameter weight is utilized
1) each index comprehensive synthesis fuzzy number is calculated
Wherein,
2) calculate possibility
If for possibility, l, m, u represent three parameters of fuzzy number, then
D is the peak that two fuzzy number subordinate functions occur simultaneously, and obtains be greater than the possibility of every other all index composite values.
3) parameter weight
If , then weight vectors can be expressed as , after it is normalized, criteria weights vector can be obtained .

Claims (6)

1. a power distribution network method for estimating stability, is characterized in that, power distribution network estimation of stability content comprises, the heavy Overflow RateHT of circuit, the heavy Overflow RateHT of distribution transforming, distribution automation coverage rate, typical wiring ratio, line looped network rate, every bar circuit access capacity of distribution transform qualification rate, line insulation rate, the average power off time of user, power failure can turn for rate, integrated voltage qualification rate.
2. a power distribution network method for estimating stability as claimed in claim 1, is characterized in that, the heavy Overflow RateHT of circuit is the important indicator in power distribution network appraisement system, and it directly reflects the running status of power distribution network;
Circuit heavily transships and affects electric power netting safe running, and harm equipment use level, affects electric network reliability level simultaneously, reduces circuit and turns power supply level, need strictly to control;
The heavy Overflow RateHT of distribution transforming directly reflects the running status of substation transformer, is directly connected to voltage levvl and power supply safety;
Distribution automation coverage rate, realizes distribution automation construction, can shorten the fault outage time, improves power supply reliability and service quality; Improve the operation and management level of distribution and reduce line loss level; Meet multi-level user's request, and then adapt to the developing direction of urban distribution network;
Typical wiring ratio, the structure of medium voltage distribution network is mainly reflected on the Connection Mode of 10kV circuit, and connections pattern directly has influence on the power supply reliability of system and the power quality of user;
Line looped network rate, strengthens line looped networkization and builds and transformation, improve looped network rate, optimize looped network level, can improve power supply reliability, strengthen;
Every bar circuit access capacity of distribution transform qualification rate, the attaching capacity of distribution transform of circuit and circuit maximum carrying capacity, economic current density, protection requirement, connections pattern, load character, load simultaneity factor factor are closely related;
Line insulation rate, the coming into operation of insulated circuit can be reduced because foreign object causes the probability of line fault, improves power supply reliability;
User's average power off time reflection power supply reliability, for user side, the length of power off time is the principal element to power grid construction satisfaction;
Power failure can turn for rate, power failure can turn supply line and be defined as: under having the circuit of communication relationship to be in the peak load method of operation simultaneously, when transformer station's outlet switch on certain loop line road is stopped transport, its whole load is by being no more than twice turn of powered operation, turn and powered by All other routes, so this circuit is called and can turns supply line, and this definition stresses Connection Mode and the load condition of considering circuit from distribution aspect, and completes load transfer under limited number of time turns powered operation;
Integrated voltage qualification rate is the mean value of each backbone point rate of qualified voltage that dispatching of power netwoks is administered, and reflects the probability that voltage fluctuates within the scope of permissible variation, and the method for estimating stability of power distribution network is embodied by the weight coefficient of evaluation index.
3. a power distribution network method for estimating stability as claimed in claim 2, is characterized in that, the computing method of weight are as follows:
(1) ambiguity function development of judgment matrix is utilized
It is defined as follows: establish ( represent the space that ambiguity function is formed), then the membership function of M , can be expressed as
In formula, , l and u is respectively the upper bound and lower bound that M supports, and title M is fuzzy number, and fuzzy number can be written as M=(l, m, u), reflect the size of blur level, i.e. fuzzy judgment matrix in element be one with for the closed interval of intermediate value,
When index set in appraisement system is time, the significance level that index contrasts between two can be obtained, be expressed as:
Here be fuzzy number.
4. a power distribution network method for estimating stability as claimed in claim 3, is characterized in that, calculates each index comprehensive synthesis fuzzy number
Wherein,
5. a power distribution network method for estimating stability as claimed in claim 4, is characterized in that, calculates possibility,
If for possibility, l, m, u represent three parameters of fuzzy number, then
D is the peak that two fuzzy number subordinate functions occur simultaneously, and obtains be greater than the possibility of every other all index composite values,
6. a power distribution network method for estimating stability as claimed in claim 4, is characterized in that, parameter weight,
If , then weight vectors can be expressed as , after it is normalized, criteria weights vector can be obtained .
CN201510143010.5A 2015-03-30 2015-03-30 Power distribution network stability evaluation method CN104700325A (en)

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Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN105760997A (en) * 2016-02-16 2016-07-13 国网山东省电力公司经济技术研究院 Power distribution network abnormal voltage assessment method based on fuzzy evaluation
CN106557991A (en) * 2016-11-04 2017-04-05 广东电网有限责任公司电力科学研究院 Voltage monitoring data platform
CN106570784A (en) * 2016-11-04 2017-04-19 广东电网有限责任公司电力科学研究院 Integrated model for voltage monitoring
CN107563665A (en) * 2017-09-18 2018-01-09 安徽蓝杰鑫信息科技有限公司 A kind of electric power facility distribution and power network resources quality testing method
CN107767060A (en) * 2017-10-27 2018-03-06 杭州海兴电力科技股份有限公司 Distribution line theoretical line loss caluclation system and method
CN110175761A (en) * 2019-05-16 2019-08-27 广西电网有限责任公司电力科学研究院 A kind of power distribution network low-voltage integrated evaluating method based on user terminal voltage deviation rate

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Cited By (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN105760997A (en) * 2016-02-16 2016-07-13 国网山东省电力公司经济技术研究院 Power distribution network abnormal voltage assessment method based on fuzzy evaluation
CN105760997B (en) * 2016-02-16 2019-07-02 国网山东省电力公司经济技术研究院 Power distribution network abnormal voltage appraisal procedure based on fuzzy evaluation
CN106557991A (en) * 2016-11-04 2017-04-05 广东电网有限责任公司电力科学研究院 Voltage monitoring data platform
CN106570784A (en) * 2016-11-04 2017-04-19 广东电网有限责任公司电力科学研究院 Integrated model for voltage monitoring
CN106557991B (en) * 2016-11-04 2020-09-22 广东电网有限责任公司电力科学研究院 Voltage monitoring data platform
CN106570784B (en) * 2016-11-04 2020-12-01 广东电网有限责任公司电力科学研究院 Voltage monitoring integrated model
CN107563665A (en) * 2017-09-18 2018-01-09 安徽蓝杰鑫信息科技有限公司 A kind of electric power facility distribution and power network resources quality testing method
CN107767060A (en) * 2017-10-27 2018-03-06 杭州海兴电力科技股份有限公司 Distribution line theoretical line loss caluclation system and method
CN107767060B (en) * 2017-10-27 2021-03-02 杭州海兴电力科技股份有限公司 Theoretical line loss calculation system and method for distribution network line
CN110175761A (en) * 2019-05-16 2019-08-27 广西电网有限责任公司电力科学研究院 A kind of power distribution network low-voltage integrated evaluating method based on user terminal voltage deviation rate
CN110175761B (en) * 2019-05-16 2021-02-26 广西电网有限责任公司电力科学研究院 Power distribution network low voltage comprehensive evaluation method based on user terminal voltage deviation rate

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Application publication date: 20150610