CN105139082A - Risk evaluation index system of multi-dimensional power distribution grid - Google Patents
Risk evaluation index system of multi-dimensional power distribution grid Download PDFInfo
- Publication number
- CN105139082A CN105139082A CN201510485807.3A CN201510485807A CN105139082A CN 105139082 A CN105139082 A CN 105139082A CN 201510485807 A CN201510485807 A CN 201510485807A CN 105139082 A CN105139082 A CN 105139082A
- Authority
- CN
- China
- Prior art keywords
- index
- voltage
- distribution network
- load
- medium
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
Classifications
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y04—INFORMATION OR COMMUNICATION TECHNOLOGIES HAVING AN IMPACT ON OTHER TECHNOLOGY AREAS
- Y04S—SYSTEMS INTEGRATING TECHNOLOGIES RELATED TO POWER NETWORK OPERATION, COMMUNICATION OR INFORMATION TECHNOLOGIES FOR IMPROVING THE ELECTRICAL POWER GENERATION, TRANSMISSION, DISTRIBUTION, MANAGEMENT OR USAGE, i.e. SMART GRIDS
- Y04S10/00—Systems supporting electrical power generation, transmission or distribution
- Y04S10/50—Systems or methods supporting the power network operation or management, involving a certain degree of interaction with the load-side end user applications
Landscapes
- Supply And Distribution Of Alternating Current (AREA)
Abstract
The invention discloses a risk evaluation index system of a multi-dimensional power distribution grid. The risk evaluation index system comprises a high-voltage distribution grid index and a middle-voltage distribution grid index, wherein the high-voltage distribution grid index comprises a high-voltage system layer index and a high-voltage device layer index, and the middle-voltage distribution grid index comprises a middle-voltage system layer index and a middle-voltage device layer index. With the risk evaluation index system for the multi-dimensional power distribution grid, disclosed by the invention, the one-sidedness and the defects of power grid evaluation by a single evaluation mode are avoided, and comprehensive and deep evaluation on the power grid are thoroughly fulfilled in a three-dimensional way; and the risk evaluation index system is conform to engineering practice, the risk existing in the power distribution grid can be fully reflected from macrocosm to microcosmic, a corresponding weak link is recognized, and a corresponding reference and a guidance basis are provided for scheduling operation.
Description
Technical field
The present invention relates to a kind of various dimensions power distribution network risk assessment index system.
Background technology
Traditional power distribution network risk evaluating system concentrates on power distribution network static security index analysis, mainly lays particular emphasis on the single characteristic such as distribution network reliability, security, the quality of power supply and construction scale and evaluates.The content that these power distribution network evaluations are studied can improve its construction level of power distribution network from different aspect, but because the single aspect only from power distribution network is evaluated, power distribution network development level can not be reflected, assessment power distribution network Problems existing comprehensively, not strong to the directive significance of power distribution network development.Assess from static security analysis angle merely, set up the too academic and generality of risk indicator out, concrete not and can not carry out risk assessment to power distribution network to through engineering approaches.
There is the problem such as small scale, grid structure imperfection in the power distribution network in the most of area of China, particularly medium voltage distribution network construction relatively lags behind, " single line is monotropic " large percentage, the existence of " seizing by the throat " problem also makes equipment often be in heavy duty, overload or occurs the stagnant phenomenon of electric power nest.How for the feature of power distribution network, the establishment operating scheme of science, to reduce the operation risk of power distribution network, the operation of power networks risk especially when equipment is in inspecting state, brings great challenge to power system operating mode adjustment.
Summary of the invention
The object of the invention is the defect overcoming prior art, for the deficiency of traditional risk evaluation system, and in conjunction with the actual needs that China's power distribution network develops, a kind of various dimensions power distribution network risk assessment index system is provided, the one-sidedness avoiding monistic assessment mode to assess electrical network and deficiency, carry out comprehensively electrical network, depth assessment comprehensively, three-dimensionally.
The technical scheme realizing above-mentioned purpose is: a kind of various dimensions power distribution network risk assessment index system, comprises high voltage distribution network index and medium voltage distribution network index, wherein:
Described high voltage distribution network index comprises high-pressure system layer index and high-tension apparatus layer index, and described high-pressure system layer index comprises main transformer heavy duty rate index, circuit heavy duty rate index, Network Loss Rate index, quality of voltage qualification rate index, high voltage substation single supply line rate, high voltage substation list main transformer rate index and expected energy not supplied index; Described high-tension apparatus layer index comprises main transformer heavy duty risk indicator, circuit heavy duty risk indicator, the out-of-limit risk indicator of busbar voltage, high voltage substation single supply line risk indicator and the monotropic risk indicator of high voltage substation;
Described medium voltage distribution network index comprises medium voltage network layer index and medium-voltage equipment layer index, and described medium voltage network layer index comprises main transformer N-1 and verify contact rate index, medium-voltage line average mark hop count index, damage sequence severity, system network shelf structure relative strength index and entire system safety indexes between percent of pass index, medium-voltage line N-1 verification percent of pass index, Zhong Ya transformer station single supply line rate index, the monotropic rate index of Zhong Ya transformer station, medium-voltage line contact rate index, medium-voltage line station; Described medium-voltage equipment layer index is comprised main transformer N-1 verification and is not verified not by load loss risk indicator during load loss risk indicator during risk indicator, Zhong Ya transformer station single supply line risk indicator, the monotropic risk indicator of Zhong Ya transformer station, switching over and breakdown maintenance by risk indicator, circuit N-1.
Above-mentioned a kind of various dimensions power distribution network risk assessment index system, wherein, described high voltage distribution network index major embodiment power flow changing is on the impact of power distribution network risk, and described medium voltage distribution network index major embodiment grid structure changes the impact on power distribution network risk.
Above-mentioned a kind of various dimensions power distribution network risk assessment index system, wherein:
Described main transformer heavy duty rate index refers to the ratio shared by heavily loaded main transformer, and heavily loaded main transformer refers to the high pressure main transformer of its load factor more than 80%, and in order to reflect the order of severity of main transformer abnormal running, its computing formula is as follows:
Described circuit heavy duty rate index refers to the ratio shared by heavy-haul line, and heavy-haul line refers to the circuit of load factor more than 80% in high-tension line, and in order to reflect the order of severity of circuit abnormal running, its computing formula is as follows:
Described Network Loss Rate index reflects energy saving and the electric energy loss situation of power distribution network, and the line losses management of high-voltage distribution network only need according to its space truss project and partition load prediction, carries out Load flow calculation obtain peak load and always consume △ P high-voltage distribution network
h, max, then draw year Energy loss and Network Loss Rate thereof according to the peak load loss time:
In formula (1.3), τ max is peak load loss hourage;
The voltage deviation value index of actual voltage value when described quality of voltage qualification rate index refers to that voltage change ratio is less than per second 1% and the difference of nominal voltage of a system value, within the limits prescribed, quality of voltage qualification rate computing formula is as follows for quality of voltage qualified dactylus point voltage deviation:
Described high voltage substation single supply line rate index refers to the ratio shared by high voltage substation only having single loop line to power, and in order to reflect high voltage distribution network reliability of structure and operational flexibility, its computing formula is as follows:
The monotropic rate index of described high voltage substation refers to the ratio shared by the high voltage substation only having separate unit main transformer, and in order to reflect high voltage distribution network reliability of structure and operational flexibility, its computing formula is as follows:
Expectation value user being supplied less to electric energy that the electric system of described expected energy not supplied index expression causes because element is forced to stop transport, electric energy deficiency expects that index comprehensive have expressed frequency of power cut, average duration and the power that on average has a power failure, and its computing formula is:
In formula (1.7), N
fbe the malfunction sum causing losing load, P (s) is for losing load condition probability, and C (s) is the mistake load under mistake load condition, and T is region load total amount.
Above-mentioned a kind of various dimensions power distribution network risk assessment index system, wherein:
Described main transformer N-1 verifies percent of pass index and refers under the peak load method of operation, after arbitrary main transformer is stopped transport, its whole load can be transferred to transformer station's proportion that other main transformer of our station is powered, the load transfer ability of reflection transformer station reality, and its computing formula is as follows:
Described medium-voltage line N-1 verifies percent of pass index and refers under the peak load method of operation, after transformer station's outlet switch is stopped transport, the whole load of this circuit just can transfer to other line powering by being no more than twice operation, ratio shared by this type of circuit, in order to reflect medium-voltage line load transfer ability under the peak load method of operation, its computing formula is as follows:
Described Zhong Ya transformer station single supply line rate index refers to the ratio shared by Zhong Ya transformer station only having single loop line to power, and in order to reflect medium voltage distribution network reliability of structure and operational flexibility, its computing formula is as follows:
The monotropic rate index of described Zhong Ya transformer station refers to the ratio shared by Zhong Ya transformer station only having separate unit main transformer, and in order to reflect medium voltage distribution network reliability of structure and operational flexibility, its computing formula is as follows:
Described medium-voltage line contact rate index refers to the ratio shared by the circuit having contact in medium voltage distribution network with All other routes, and in order to reflect medium voltage distribution network reliability of structure and operational flexibility, its computing formula is as follows:
Between medium-voltage line station, contact rate index refers to the ratio shared by the circuit having contact in medium voltage distribution network with the circuit of other transformer stations, and in order to reflect medium voltage distribution network reliability of structure and operational flexibility, its computing formula is as follows:
Described medium-voltage line average mark hop count index to be powered dirigibility and dead electricity coverage in order to reflect medium voltage distribution network, and its computing formula is as follows:
Described damage sequence severity, by rate of energy loss C after contingent
fEwith amount loss percentage C during electricity consumption
fCnamely weighted sum obtains single damage sequence severity:
C
F＝ω
1·C
FE+ω
2·C
FL＝λ·L·T
FL·(ω
1·ρ
FL+ω
2·ρ
FC)＝λ·L·T
FL·ρ
F(2.8)
ω in formula (2.8)
1and ω
2the weight coefficient of amount loss percentage when being respectively rate of energy loss and electricity consumption, with the difference of reflected appraisal emphasis, generally, the two can get 1 simultaneously; ρ
f=ω
1ρ
fL+ ω
2ρ
fC, this value only reflects the transient effects of accident, is applicable to an evaluation procedure for care accident transient effects;
Described system network shelf structure relative strength index, the order of severity of the K value that consideration accident is simultaneously corresponding and damage sequence, can evaluate the power of a system network shelf structure more comprehensively and practically, and system network shelf structure relative strength index K ' computing formula is:
In formula (2.9), N
bfor system branch number; K
ifor the K value corresponding to contingent occurs branch road i;
for the single damage sequence severity of branch road i;
Described entire system safety indexes S
scomputing formula is as follows:
S
S＝K′/C
SF(2.10)
When the grid structure of a system is more by force that K ' is larger, then after accident, the ratio of cutting load can be less, causes its damage sequence severity C
sFalso smaller, the final S embodied
sdesired value is larger, and obviously, such security of system is also higher.
Above-mentioned a kind of various dimensions power distribution network risk assessment index system, wherein:
During described switching over, the reflection of load loss risk indicator is due to the impact of switching over operation on customer power supply, load loss Q during switching over
mVTRcomputing formula is as follows:
P
MVTR＝P
f(2.11)
Q
MVTR＝λ
1-MV×t
TR×P
MVTR(2.12)
In formula (2.11) and formula (2.12): P
ffor pressing feeder line institute on-load in wall scroll; λ
1-MVfor the failure rate of medium-voltage line; t
tRfor on average switching the duration;
During described breakdown maintenance, load loss risk indicator faults maintenance operation is on the impact of customer power supply, load loss Q during breakdown maintenance
mVRcomputing formula is as follows:
P
MVR＝P
MVTR/n
s-MV(2.13)
Q
MVR＝λ
1-MV×t
MV×P
MVR(2.14)
In formula (2.13) and formula (2.14): P
mVTRfor pressing feeder line institute on-load in wall scroll; n
s-MVfor number of faults; λ
1-MVfor the failure rate of medium-voltage line; t
mVfor average failure duration.
Various dimensions power distribution network risk assessment index system of the present invention, beneficial effect is compared with prior art: the one-sidedness avoiding monistic assessment mode to assess electrical network and deficiency, carries out comprehensively, depth assessment to electrical network comprehensively, three-dimensionally; Meet engineering reality, can reflect the risk that power distribution network exists from macroscopic view to microcosmic, the corresponding weak link of identification, provides corresponding reference for management and running and instructs foundation comprehensively.Meanwhile, this system can be applicable to the lateral comparison between each urban power distribution network, to reflect the development level of power distribution network and weak part, instructs the construction and development of power distribution network.Various dimensions risk evaluating system of the present invention, its objective is the effective interlock in order to realize based on the Power System Security Assessment of risk and the operation management and control of decision support, so that management and running personnel grasp the changing trend of power grid security risk comprehensively; From various dimensions, system risk is assessed, the risk trend of operations staff to electrical network is made to have the assurance of macroscopic view, utilize real-time risk assessment feedback information, take corresponding control measure in time, system risk level is reduced in acceptable scope, thus the loss reducing or avoid risk case to cause.
Accompanying drawing explanation
Fig. 1 is the structured flowchart of various dimensions power distribution network risk assessment index system of the present invention.
Embodiment
In order to make those skilled in the art can understand technical scheme of the present invention better, below in conjunction with accompanying drawing, its embodiment is described in detail:
Embodiments of the invention:
The electric pressure of China's distribution system, according to the regulation of " urban power network planning Guidance Rule ", 35kV, 66kV, 110kV are high tension distribution system, and 10kV, 6kV are intermediate distribution system, 380V and 220V is low-voltage distribution system, and 220kV and above voltage thereof are power transmission and transformation system.But along with the continuous expansion of urban electricity supply capacity and service area, some megalopolis, as Beijing, Shanghai etc., introduce urban district by 220kV voltage at present and carry out distribution.
The feature of high voltage distribution network is that structure is relatively stable, and grid structure change is little, and it is huge that construction relates to investment, and coverage is wide.Therefore, dirigibility is transformed little.Such as, for the distribution transforming running the longer or high loss of the time limit, directly can be replaced by the novel distribution transforming of low power consuming, and for running the high pressure main transformer of the longer or high loss of the time limit, invest huge during replacing, generally all can not change easily.
It is various that medium voltage distribution network has number of devices, and complex structure is various, runs very complicated.Medium voltage distribution network needs often to change the method for operation and runs, and grid structure change greatly.Medium voltage distribution network has been the bottleneck of power distribution network development, and the quality of medium voltage distribution network, all has considerable impact to the economy, reliability, the quality of power supply etc. of whole distribution system.
Power grid risk assessment can be divided into high voltage distribution network risk assessment, medium voltage network risk assessment and low voltage electric network risk assessment according to line voltage grade separation, considers from different brackets, can give prominence to the assessment emphasis that different electric pressure is paid close attention to.Dimension power distribution network risk assessment index system of the present invention, high voltage distribution network index stresses the impact of power flow changing on power distribution network risk, medium voltage distribution network index stresses the impact of grid structure change on power distribution network risk, emphasizes particularly on different fields, never the feature of ipsilateral prominent index system.
Carry out layering and zoning for power distribution network to run, the topological structure of electric feature that each section electrical network is relatively independent, need the risk evaluation result paying close attention to different stage distinctively, from macroscopic view to microcosmic, make comprehensive and detailed assessment, therefore from Spatial Dimension, risk indicator is divided and be namely divided into mechanical floor and system layer.
Such as, there is the problem such as small scale, grid structure imperfection in most of local distribution network, power distribution network " single line is monotropic " large percentage, the impact that this problem can explain these risk factors from macroscopic view to microcosmic is comprehensively evaluated from system layer and mechanical floor angle, therefore the single main transformer rate of power distribution network risk evaluation system primary study transformer station and transformer station single line rate, consider these indexs in system layer and mechanical floor simultaneously, from Spatial Dimension, at large illustrate the impact of these risk factors.If there is no Spatial Dimension evaluation, then easily form unilateral evaluation.
From the angle of system layer, operations staff can be helped to understand the risk level of whole regional distribution network, also can be analyzed with the risk of other section electrical networks; From mechanical floor, by situations such as computation overload equipment and equipment decompressions, under can helping the same malfunction of operations staff's comparative analysis, which equipment Risk level is high, and emphasis carries out risk control to this part equipment.
Application on Spatial Dimension, can combine the feature of actual power distribution network hierarchical control well, and can help the risk of progressively analyzing electrical network existence of operations staff from microcosmic to macroscopic view.
The risk assessment index system of multi-spatial scale combination can cover the Primary layer district rank of operation of power networks, three-dimensionally comprehensive safety risk assessment is carried out to electrical network, management and running personnel can according to concrete scene, pay close attention to the risk evaluation result of different stage discriminatively, and take corresponding management and control and Operation Measures, regulation and control risk level, guarantees electric power netting safe running.
Refer to Fig. 1, in conjunction with the electric pressure of Spatial Dimension and China's distribution system, a kind of various dimensions power distribution network risk assessment index system of the present invention, comprises high voltage distribution network index 1 and medium voltage distribution network index 2.
High voltage distribution network index 1 comprises high-pressure system layer index 11 and high-tension apparatus layer index 12, and high-pressure system layer index 11 comprises main transformer heavy duty rate index 111, circuit heavy duty rate index 112, Network Loss Rate index 113, quality of voltage qualification rate index 114, high voltage substation single supply line rate 115, high voltage substation list main transformer rate index 116 and expected energy not supplied index 117; High-tension apparatus layer index 12 comprises main transformer heavy duty risk indicator 121, circuit heavy duty risk indicator 122, the out-of-limit risk indicator of busbar voltage 123, high voltage substation single supply line risk indicator 124 and the monotropic risk indicator 125 of high voltage substation.
Medium voltage distribution network index 2 comprises medium voltage network layer index 21 and medium-voltage equipment layer index 22, and medium voltage network layer index 21 comprises main transformer N-1 and verify contact rate index 216, medium-voltage line average mark hop count index 317, damage sequence severity 218, system network shelf structure relative strength index 219 and entire system safety indexes 210 between percent of pass index 211, medium-voltage line N-1 verification percent of pass index 212, Zhong Ya transformer station single supply line rate index 213, the monotropic rate index 214 of Zhong Ya transformer station, medium-voltage line contact rate index 215, medium-voltage line station; Medium-voltage equipment layer index 22 is comprised main transformer N-1 verification and is not verified not by load loss risk indicator 226 during load loss risk indicator 225 during risk indicator 222, Zhong Ya transformer station single supply line risk indicator 223, the monotropic risk indicator 224 of Zhong Ya transformer station, switching over and breakdown maintenance by risk indicator 221, circuit N-1.
High voltage distribution network index 1 major embodiment power flow changing is on the impact of power distribution network risk, and medium voltage distribution network index 2 major embodiment grid structure changes the impact on power distribution network risk.
Main transformer heavy duty rate index 111 refers to the ratio shared by heavily loaded main transformer, and heavily loaded main transformer refers to the high pressure main transformer of its load factor more than 80%, and in order to reflect the order of severity of main transformer abnormal running, its computing formula is as follows:
Circuit heavy duty rate index 112 refers to the ratio shared by heavy-haul line, and heavy-haul line refers to the circuit of load factor more than 80% in high-tension line, and in order to reflect the order of severity of circuit abnormal running, its computing formula is as follows:
Network Loss Rate index 113 reflects energy saving and the electric energy loss situation of power distribution network, and the line losses management of high-voltage distribution network only need according to its space truss project and partition load prediction, carries out Load flow calculation obtain peak load and always consume △ P high-voltage distribution network
h, max, then draw year Energy loss and Network Loss Rate thereof according to the peak load loss time:
In formula (1.3), τ max is peak load loss hourage.
The voltage deviation value index of actual voltage value when quality of voltage qualification rate index 114 refers to that voltage change ratio is less than per second 1% and the difference of nominal voltage of a system value, within the limits prescribed, quality of voltage qualification rate computing formula is as follows for quality of voltage qualified dactylus point voltage deviation:
Quality of voltage qualification rate index 114 reflects distribution network voltage deviation situation, according to " State Grid Corporation of China's power system voltage quality and var administrative provisions " regulation, quality of voltage refers to the voltage deviation value index of slow change (actual voltage value when namely voltage change ratio is less than per second 1% and the difference of nominal voltage of a system value).
High voltage substation single supply line rate index 115 refers to the ratio shared by high voltage substation only having single loop line to power, and in order to reflect high voltage distribution network reliability of structure and operational flexibility, its computing formula is as follows:
The monotropic rate index 116 of high voltage substation refers to the ratio shared by the high voltage substation only having separate unit main transformer, and in order to reflect high voltage distribution network reliability of structure and operational flexibility, its computing formula is as follows:
Expected energy not supplied index 117 represents expectation value user being supplied less to electric energy that electric system causes because element is forced to stop transport, and electric energy deficiency expects that index comprehensive have expressed frequency of power cut, average duration and the power that on average has a power failure, and its computing formula is:
In formula (1.7), N
fbe the malfunction sum causing losing load, P (s) is for losing load condition probability, and C (s) is the mistake load under mistake load condition, and T is region load total amount.
Main transformer N-1 verifies percent of pass index 211 and refers under the peak load method of operation, after arbitrary main transformer is stopped transport, its whole load can be transferred to transformer station's proportion that other main transformer of our station is powered, the load transfer ability of reflection transformer station reality, and its computing formula is as follows:
Medium-voltage line N-1 verifies percent of pass index 212 and refers under the peak load method of operation, after transformer station's outlet switch is stopped transport, the whole load of this circuit just can transfer to other line powering by being no more than twice operation, ratio shared by this type of circuit, in order to reflect medium-voltage line load transfer ability under the peak load method of operation, its computing formula is as follows:
Zhong Ya transformer station single supply line rate index 213 refers to the ratio shared by Zhong Ya transformer station only having single loop line to power, and in order to reflect medium voltage distribution network reliability of structure and operational flexibility, its computing formula is as follows:
The monotropic rate index 214 of Zhong Ya transformer station refers to the ratio shared by Zhong Ya transformer station only having separate unit main transformer, and in order to reflect medium voltage distribution network reliability of structure and operational flexibility, its computing formula is as follows:
Medium-voltage line contact rate index 215 refers to the ratio shared by the circuit having contact in medium voltage distribution network with All other routes, and in order to reflect medium voltage distribution network reliability of structure and operational flexibility, its computing formula is as follows:
Between medium-voltage line station, contact rate index 216 refers to the ratio shared by the circuit having contact in medium voltage distribution network with the circuit of other transformer stations, and in order to reflect medium voltage distribution network reliability of structure and operational flexibility, its computing formula is as follows:
Medium-voltage line average mark hop count index 217 to be powered dirigibility and dead electricity coverage in order to reflect medium voltage distribution network, and its computing formula is as follows:
Damage sequence severity 218 is by rate of energy loss C after contingent
fEwith amount loss percentage C during electricity consumption
fCnamely weighted sum obtains single damage sequence severity:
C
F＝ω
1·C
FE+ω
2·C
FL＝λ·L·T
FL·(ω
1·ρ
FL+ω
2·ρ
FC)＝λ·L·T
FL·ρ
F(2.8)
ω in formula (2.8)
1and ω
2the weight coefficient of amount loss percentage when being respectively rate of energy loss and electricity consumption, with the difference of reflected appraisal emphasis, generally, the two can get 1 simultaneously; ρ
f=ω
1ρ
fL+ ω
2ρ
fC, this value only reflects the transient effects of accident, is applicable to an evaluation procedure for care accident transient effects.
System network shelf structure relative strength index 219, if after in distribution system, each possible contingent occurs, all can pass through the little operation of cost, meeting Prescribed Properties prerequisite under, complete and confession (the K value namely in system corresponding to each contingent is at least 1) is turned to the safety of dead electricity load in all non-faulting regions, so just can think that this system has stronger grid structure.In order to evaluate the power of a system network shelf structure more comprehensively and practically, should the order of severity of K value corresponding to consideration accident simultaneously and damage sequence, can evaluate the power of a system network shelf structure more comprehensively and practically, system network shelf structure relative strength index K ' computing formula is:
In formula (2.9), N
bfor system branch number; K
ifor the K value corresponding to contingent occurs branch road i;
for the single damage sequence severity of branch road i.
No matter it is current to be that damage sequence severity 218 or system network shelf structure relative strength index 219 all only reflect a side of security of system, need a kind of index and can combine them overall security in order to descriptive system, define system overall security index 210 for this reason, entire system safety indexes S
scomputing formula is:
S
S＝K′/C
SF(2.10)
When the grid structure of a system is more by force that K ' is larger, then after accident, the ratio of cutting load can be less, causes its damage sequence severity C
sFalso smaller, the final S embodied
sdesired value is larger, and obviously, such security of system is also higher.
During switching over, load loss risk indicator 225 reflects due to the impact of switching over operation on customer power supply, load loss Q during switching over
mVTRcomputing formula is as follows:
P
MVTR＝P
f(2.11)
Q
MVTR＝λ
1-MV×t
TR×P
MVTR(2.12)
In formula (2.11) and formula (2.12): P
ffor pressing feeder line institute on-load in wall scroll; λ
1-MVfor the failure rate of medium-voltage line; t
tRfor on average switching the duration.
During breakdown maintenance, load loss risk indicator 226 faults maintenance operation is on the impact of customer power supply, load loss Q during breakdown maintenance
mVRcomputing formula is as follows:
P
MVR＝P
MVTR/n
s-MV(2.13)
Q
MVR＝λ
1-MV×t
MV×P
MVR(2.14)
In formula (2.13) and formula (2.14): P
mVTRfor pressing feeder line institute on-load in wall scroll; n
s-MVfor number of faults; λ
1-MVfor the failure rate of medium-voltage line; t
mVfor average failure duration.
Various dimensions power distribution network risk assessment index system of the present invention, the one-sidedness avoiding monistic assessment mode to assess electrical network and deficiency, carry out comprehensively electrical network, depth assessment comprehensively, three-dimensionally; Meet engineering reality, can reflect the risk that power distribution network exists from macroscopic view to microcosmic, the corresponding weak link of identification, provides corresponding reference for management and running and instructs foundation comprehensively.
Various dimensions risk evaluating system of the present invention, its objective is the effective interlock in order to realize based on the Power System Security Assessment of risk and the operation management and control of decision support, so that management and running personnel grasp the changing trend of power grid security risk comprehensively; From various dimensions, system risk is assessed, the risk trend of operations staff to electrical network is made to have the assurance of macroscopic view, utilize real-time risk assessment feedback information, take corresponding control measure in time, system risk level is reduced in acceptable scope, thus the loss reducing or avoid risk case to cause.
Those of ordinary skill in the art will be appreciated that, above embodiment is only used to the present invention is described, and be not used as limitation of the invention, as long as in spirit of the present invention, all will drop in Claims scope of the present invention the change of the above embodiment, modification.
Claims (5)
1. a various dimensions power distribution network risk assessment index system, is characterized in that, comprises high voltage distribution network index and medium voltage distribution network index, wherein:
Described high voltage distribution network index comprises high-pressure system layer index and high-tension apparatus layer index, and described high-pressure system layer index comprises main transformer heavy duty rate index, circuit heavy duty rate index, Network Loss Rate index, quality of voltage qualification rate index, high voltage substation single supply line rate, high voltage substation list main transformer rate index and expected energy not supplied index; Described high-tension apparatus layer index comprises main transformer heavy duty risk indicator, circuit heavy duty risk indicator, the out-of-limit risk indicator of busbar voltage, high voltage substation single supply line risk indicator and the monotropic risk indicator of high voltage substation;
Described medium voltage distribution network index comprises medium voltage network layer index and medium-voltage equipment layer index, and described medium voltage network layer index comprises main transformer N-1 and verify contact rate index, medium-voltage line average mark hop count index, damage sequence severity, system network shelf structure relative strength index and entire system safety indexes between percent of pass index, medium-voltage line N-1 verification percent of pass index, Zhong Ya transformer station single supply line rate index, the monotropic rate index of Zhong Ya transformer station, medium-voltage line contact rate index, medium-voltage line station; Described medium-voltage equipment layer index is comprised main transformer N-1 verification and is not verified not by load loss risk indicator during load loss risk indicator during risk indicator, Zhong Ya transformer station single supply line risk indicator, the monotropic risk indicator of Zhong Ya transformer station, switching over and breakdown maintenance by risk indicator, circuit N-1.
2. a kind of various dimensions power distribution network risk assessment index system according to claim 1, it is characterized in that, described high voltage distribution network index major embodiment power flow changing is on the impact of power distribution network risk, and described medium voltage distribution network index major embodiment grid structure changes the impact on power distribution network risk.
3. a kind of various dimensions power distribution network risk assessment index system according to claim 1, is characterized in that:
Described main transformer heavy duty rate index refers to the ratio shared by heavily loaded main transformer, and heavily loaded main transformer refers to the high pressure main transformer of its load factor more than 80%, and in order to reflect the order of severity of main transformer abnormal running, its computing formula is as follows:
Described circuit heavy duty rate index refers to the ratio shared by heavy-haul line, and heavy-haul line refers to the circuit of load factor more than 80% in high-tension line, and in order to reflect the order of severity of circuit abnormal running, its computing formula is as follows:
Described Network Loss Rate index reflects energy saving and the electric energy loss situation of power distribution network, and the line losses management of high-voltage distribution network only need according to its space truss project and partition load prediction, carries out Load flow calculation obtain peak load and always consume △ P high-voltage distribution network
h, max, then draw year Energy loss and Network Loss Rate thereof according to the peak load loss time:
In formula (1.3), τ
maxfor peak load loss hourage;
The voltage deviation value index of actual voltage value when described quality of voltage qualification rate index refers to that voltage change ratio is less than per second 1% and the difference of nominal voltage of a system value, within the limits prescribed, quality of voltage qualification rate computing formula is as follows for quality of voltage qualified dactylus point voltage deviation:
Described high voltage substation single supply line rate index refers to the ratio shared by high voltage substation only having single loop line to power, and in order to reflect high voltage distribution network reliability of structure and operational flexibility, its computing formula is as follows:
The monotropic rate index of described high voltage substation refers to the ratio shared by the high voltage substation only having separate unit main transformer, and in order to reflect high voltage distribution network reliability of structure and operational flexibility, its computing formula is as follows:
Expectation value user being supplied less to electric energy that the electric system of described expected energy not supplied index expression causes because element is forced to stop transport, electric energy deficiency expects that index comprehensive have expressed frequency of power cut, average duration and the power that on average has a power failure, and its computing formula is:
In formula (1.7), Nf is the malfunction sum causing losing load, and P (s) is for losing load condition probability, and C (s) is the mistake load under mistake load condition, and T is region load total amount.
4. a kind of various dimensions power distribution network risk assessment index system according to claim 1, is characterized in that:
Described main transformer N-1 verifies percent of pass index and refers under the peak load method of operation, after arbitrary main transformer is stopped transport, its whole load can be transferred to transformer station's proportion that other main transformer of our station is powered, the load transfer ability of reflection transformer station reality, and its computing formula is as follows:
Described medium-voltage line N-1 verifies percent of pass index and refers under the peak load method of operation, after transformer station's outlet switch is stopped transport, the whole load of this circuit just can transfer to other line powering by being no more than twice operation, ratio shared by this type of circuit, in order to reflect medium-voltage line load transfer ability under the peak load method of operation, its computing formula is as follows:
Described Zhong Ya transformer station single supply line rate index refers to the ratio shared by Zhong Ya transformer station only having single loop line to power, and in order to reflect medium voltage distribution network reliability of structure and operational flexibility, its computing formula is as follows:
The monotropic rate index of described Zhong Ya transformer station refers to the ratio shared by Zhong Ya transformer station only having separate unit main transformer, and in order to reflect medium voltage distribution network reliability of structure and operational flexibility, its computing formula is as follows:
Described medium-voltage line contact rate index refers to the ratio shared by the circuit having contact in medium voltage distribution network with All other routes, and in order to reflect medium voltage distribution network reliability of structure and operational flexibility, its computing formula is as follows:
Between medium-voltage line station, contact rate index refers to the ratio shared by the circuit having contact in medium voltage distribution network with the circuit of other transformer stations, and in order to reflect medium voltage distribution network reliability of structure and operational flexibility, its computing formula is as follows:
Described medium-voltage line average mark hop count index to be powered dirigibility and dead electricity coverage in order to reflect medium voltage distribution network, and its computing formula is as follows:
Described damage sequence severity, by rate of energy loss C after contingent
fEwith amount loss percentage C during electricity consumption
fCnamely weighted sum obtains single damage sequence severity:
C
F＝ω
1·C
FE+ω
2·C
FL＝λ·L·T
FL·(ω
1·ρ
FL+ω
2·ρ
FC)＝λ·L·T
FL·ρ
F(2.8)
ω in formula (2.8)
1and ω
2the weight coefficient of amount loss percentage when being respectively rate of energy loss and electricity consumption, with the difference of reflected appraisal emphasis, generally, the two can get 1 simultaneously; ρ
f=ω
1ρ
fL+ ω
2ρ
fC, this value only reflects the transient effects of accident, is applicable to an evaluation procedure for care accident transient effects;
Described system network shelf structure relative strength index, the order of severity of the K value that consideration accident is simultaneously corresponding and damage sequence, can evaluate the power of a system network shelf structure more comprehensively and practically, and system network shelf structure relative strength index K ' computing formula is:
In formula (2.9), N
bfor system branch number; K
ifor the K value corresponding to contingent occurs branch road i;
for the single damage sequence severity of branch road i;
Described entire system safety indexes S
scomputing formula is as follows:
S
S＝K′/C
SF(2.10)
When the grid structure of a system is more by force that K ' is larger, then after accident, the ratio of cutting load can be less, causes its damage sequence severity C
sFalso smaller, the final S embodied
sdesired value is larger, and obviously, such security of system is also higher.
5. a kind of various dimensions power distribution network risk assessment index system according to claim 1, is characterized in that:
During described switching over, the reflection of load loss risk indicator is due to the impact of switching over operation on customer power supply, load loss Q during switching over
mVTRcomputing formula is as follows:
P
MVTR＝P
f(2.11)
Q
MVTR＝λ
1-MV×t
TR×P
MVTR(2.12)
In formula (2.11) and formula (2.12): P
ffor pressing feeder line institute on-load in wall scroll; λ
1-MVfor the failure rate of medium-voltage line; t
tRfor on average switching the duration;
During described breakdown maintenance, load loss risk indicator faults maintenance operation is on the impact of customer power supply, load loss Q during breakdown maintenance
mVRcomputing formula is as follows:
P
MVR＝P
MVTR/n
s-MV(2.13)
Q
MVR＝λ
1-MV×t
MV×P
MVR(2.14)
In formula (2.13) and formula (2.14): P
mVTRfor pressing feeder line institute on-load in wall scroll; n
s-MVfor number of faults; λ
1-MVfor the failure rate of medium-voltage line; t
mVfor average failure duration.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510485807.3A CN105139082A (en) | 2015-08-10 | 2015-08-10 | Risk evaluation index system of multi-dimensional power distribution grid |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510485807.3A CN105139082A (en) | 2015-08-10 | 2015-08-10 | Risk evaluation index system of multi-dimensional power distribution grid |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN105139082A true CN105139082A (en) | 2015-12-09 |
Family
ID=54724423
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201510485807.3A Pending CN105139082A (en) | 2015-08-10 | 2015-08-10 | Risk evaluation index system of multi-dimensional power distribution grid |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN105139082A (en) |
Cited By (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106655150A (en) * | 2016-09-28 | 2017-05-10 | 深圳供电局有限公司 | Power distribution network operation mode optimization method |
| CN107064740A (en) * | 2017-03-31 | 2017-08-18 | 中国农业大学 | A kind of radial distribution networks amount of energy saving Forecasting Methodology and device |
| CN108805407A (en) * | 2018-05-04 | 2018-11-13 | 国网四川省电力公司电力科学研究院 | A kind of electricity power engineering safety estimation system based on big data |
| CN110111215A (en) * | 2019-05-05 | 2019-08-09 | 中国电力企业联合会电力建设技术经济咨询中心 | The intrinsic operational flexibility evaluation method of a thermoelectricity group of planes of meter and discrete power output feature |
| CN110147960A (en) * | 2019-05-23 | 2019-08-20 | 清科优能(深圳)技术有限公司 | A kind of enterprise's multidimensional distribution health index control method |
| CN111080149A (en) * | 2019-12-20 | 2020-04-28 | 四川大学 | Mixed calculation method for reliability of high-medium-low voltage integrated power distribution network |
| CN112561251A (en) * | 2020-11-30 | 2021-03-26 | 广东电网有限责任公司广州供电局 | Power distribution network abnormal point detection method and device, computer equipment and storage medium |
| CN113505951A (en) * | 2021-03-31 | 2021-10-15 | 国网山西省电力公司吕梁供电公司 | Distribution network planning overall process evaluation management system |
| CN113592126A (en) * | 2020-04-30 | 2021-11-02 | 贵州电网有限责任公司 | Coordination evaluation method and system based on grid structure of high-voltage and medium-voltage power distribution network |
| US12032369B2 (en) * | 2022-09-14 | 2024-07-09 | Tianjin University | Method, software system, server and physical terminal of analytical calculation of power supply reliability indexes of complex power distribution networks with multi-connections |
-
2015
- 2015-08-10 CN CN201510485807.3A patent/CN105139082A/en active Pending
Cited By (14)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106655150A (en) * | 2016-09-28 | 2017-05-10 | 深圳供电局有限公司 | Power distribution network operation mode optimization method |
| CN107064740A (en) * | 2017-03-31 | 2017-08-18 | 中国农业大学 | A kind of radial distribution networks amount of energy saving Forecasting Methodology and device |
| CN108805407B (en) * | 2018-05-04 | 2021-10-19 | 国网四川省电力公司电力科学研究院 | Power grid engineering safety assessment system based on big data |
| CN108805407A (en) * | 2018-05-04 | 2018-11-13 | 国网四川省电力公司电力科学研究院 | A kind of electricity power engineering safety estimation system based on big data |
| CN110111215A (en) * | 2019-05-05 | 2019-08-09 | 中国电力企业联合会电力建设技术经济咨询中心 | The intrinsic operational flexibility evaluation method of a thermoelectricity group of planes of meter and discrete power output feature |
| CN110111215B (en) * | 2019-05-05 | 2021-06-11 | 中国电力企业联合会电力建设技术经济咨询中心 | Thermal power plant group inherent operation flexibility evaluation method considering discrete output characteristics |
| CN110147960A (en) * | 2019-05-23 | 2019-08-20 | 清科优能(深圳)技术有限公司 | A kind of enterprise's multidimensional distribution health index control method |
| CN111080149A (en) * | 2019-12-20 | 2020-04-28 | 四川大学 | Mixed calculation method for reliability of high-medium-low voltage integrated power distribution network |
| CN111080149B (en) * | 2019-12-20 | 2022-08-09 | 四川大学 | Mixed calculation method for reliability of high-medium-low voltage integrated power distribution network |
| CN113592126A (en) * | 2020-04-30 | 2021-11-02 | 贵州电网有限责任公司 | Coordination evaluation method and system based on grid structure of high-voltage and medium-voltage power distribution network |
| CN113592126B (en) * | 2020-04-30 | 2023-05-26 | 贵州电网有限责任公司 | Coordination evaluation method and system based on grid structure of high-voltage and medium-voltage power distribution network |
| CN112561251A (en) * | 2020-11-30 | 2021-03-26 | 广东电网有限责任公司广州供电局 | Power distribution network abnormal point detection method and device, computer equipment and storage medium |
| CN113505951A (en) * | 2021-03-31 | 2021-10-15 | 国网山西省电力公司吕梁供电公司 | Distribution network planning overall process evaluation management system |
| US12032369B2 (en) * | 2022-09-14 | 2024-07-09 | Tianjin University | Method, software system, server and physical terminal of analytical calculation of power supply reliability indexes of complex power distribution networks with multi-connections |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN105139082A (en) | Risk evaluation index system of multi-dimensional power distribution grid | |
| Kalair et al. | Comparative study of HVAC and HVDC transmission systems | |
| CN103839116B (en) | A kind of substation capacity collocation method based on different power supply areas | |
| CN104700325A (en) | Power distribution network stability evaluation method | |
| CN103326300A (en) | Power-failure-free direct-current deicing device | |
| CN111552925A (en) | Method for constructing comprehensive evaluation index system of alternating current-direct current hybrid power distribution network | |
| CN103972897B (en) | A kind of extra-high-voltage alternating current transformer station 500kV bus working voltage control range defining method | |
| Zhang et al. | Research on the influence of electric railway bilateral power supply on power system and countermeasures | |
| Billinton et al. | Reliability evaluation of hybrid multiterminal HVDC subtransmission systems | |
| CN106712030A (en) | Voltage stability discrimination method for DC receiving end AC system based on WAMS (Wide Area Measurement System) dynamic tracking | |
| CN106786594B (en) | A kind of alternating current-direct current mixing distribution system containing important load | |
| CN104538959A (en) | Method for assessing high voltage distribution network load transfer capacity | |
| CN106780152A (en) | The comparing system of selection of extra-high voltage alternating current-direct current reliability of transmission system and economy | |
| CN207559559U (en) | A kind of rail traffic tractive power supply system | |
| CN107785921B (en) | Urban power grid partition interconnection operation scheduling method based on flexible direct current transmission technology | |
| CN113258579B (en) | Method for calculating short-circuit current of electrified railway of hybrid power supply mode bilateral power supply system | |
| CN102110986B (en) | Reactive power compensation device for traction substation in electrified railway | |
| Kilter et al. | Modelling of high-speed electrical railway system for transmission network voltage quality analysis: Rail Baltic case study | |
| Wang et al. | Theoretical Analysis of Power Loss Reduction for Typical Power Grid | |
| Guangyuan et al. | A Diversify Distribution Power Grid Planning Method Based on the Features of Areas in Smart Cities | |
| Yao et al. | Research on reactive power optimization of Long Distance Ultra-high Voltage Cable Connected to Municipal Power Grid | |
| Zhang et al. | Reliability-oriented distribution network reconfiguration | |
| Huang et al. | Distribution network load distribution strategy considering the economy of parallel transformers | |
| Chen et al. | Research on Evaluation Method of Open-loop Scheme of Electromagnetic Loop Network Based on Comprehensive Weight | |
| Kang et al. | Power quality problem and key improvement technology for regional power grids |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| WD01 | Invention patent application deemed withdrawn after publication | ||
| WD01 | Invention patent application deemed withdrawn after publication |
Application publication date: 20151209 |