CN107732885B - Consider that the inhibition grid short circuit electric current broken string sequence of safety and sensitivity determines method - Google Patents
Consider that the inhibition grid short circuit electric current broken string sequence of safety and sensitivity determines method Download PDFInfo
- Publication number
- CN107732885B CN107732885B CN201711066568.3A CN201711066568A CN107732885B CN 107732885 B CN107732885 B CN 107732885B CN 201711066568 A CN201711066568 A CN 201711066568A CN 107732885 B CN107732885 B CN 107732885B
- Authority
- CN
- China
- Prior art keywords
- route
- cut
- value
- short circuit
- circuit current
- 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.)
- Active
Links
Classifications
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H7/00—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions
- H02H7/26—Sectionalised protection of cable or line systems, e.g. for disconnecting a section on which a short-circuit, earth fault, or arc discharge has occured
- H02H7/30—Staggered disconnection
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H3/00—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal electric working condition with or without subsequent reconnection ; integrated protection
- H02H3/08—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal electric working condition with or without subsequent reconnection ; integrated protection responsive to excess current
Landscapes
- Protection Of Static Devices (AREA)
- Supply And Distribution Of Alternating Current (AREA)
Abstract
The problem of determining method the invention discloses the inhibition grid short circuit electric current broken string sequence of a kind of consideration safety and sensitivity, solve the existing route that cut-offs and do not consider power grid security factor, be easy to cause the other route heavy overloads near region and voltage stability margin decline.By the susceptibility for normalizing the short circuit current susceptibility and change of power flow that can cut-off route, and route is overheated into steady limitation and punishes respective penalty function with the introducing of Voltage Instability risk, make a kind of inhibition grid short circuit electric current broken string ordering strategy for fully considering sensitivity and electric network security.The present invention can cut-off route for the exceeded plant stand near region of grid short circuit electric current, combine the influence for considering short circuit current inhibitory effect, near region Line Flow variable quantity and hot surely limitation, Network Voltage Stability nargin etc. factors, and the influence to above each factor is quantified, and the route that cut-offs of the exceeded plant stand of short circuit current has reasonably been carried out priority ranking.
Description
Technical field
The present invention relates to a kind of power network safety operation fields, and in particular to a kind of suppression for considering safety and sensitivity
Grid short circuit electric current broken string method processed.
Background technique
In recent years, with the fast development of power grid, since grid contact is more and more closer, lead to certain plant stands in power grid
It shows short circuit current excessive problem day and protrudes, seriously threatened the safe and stable operation of power grid.It is exceeded for short circuit current
Plant stand, the effective ways that the prior art inhibits its short circuit current exceeded are to cut-off route.Due to cut-offfing exceeded plant stand near region route
Inhibiting short circuit current, the good results are evident, and does not have to additional new investment, simple and easy, is to inhibit the main of short circuit current in recent years
Method.But the exceeded plant stand of short circuit current there are many route for cut-offfing, inhibit short circuit current for cut-offfing which route
Selection, the prior art are judged according to the fall for cut-offfing short circuit current after this route, are not yet integrated and are examined
Consider the factors such as the other factors, such as steady-state load flow is out-of-limit, voltage stability margin for influencing power grid security.If selection cut-offs route not
Rationally, it will cause after cut-offfing route, electric network swim shifts on a large scale, causes the other route heavy overloads near region, and voltage
Stability margin also declines, and new operation problem is brought to power grid.
Summary of the invention
The present invention provides a kind of consideration safety and the inhibition grid short circuit electric current broken string sequence of sensitivity to determine method, solution
The existing route that cut-offs of having determined does not consider power grid security factor, be easy to cause the other route heavy overloads near region and voltage stability margin
The technical issues of decline.
The present invention is to solve the above technical problem by the following technical programs:
The present general inventive concept is: the short circuit current susceptibility and change of power flow of route can be cut-off by normalizing
Susceptibility, and the steady limitation of route overheat is punished into respective penalty function with the introducing of Voltage Instability risk, it makes one kind and sufficiently examines
Consider the inhibition grid short circuit electric current broken string ordering strategy of sensitivity and electric network security.
A kind of determining method of inhibition grid short circuit electric current broken string sequence considering safety and sensitivity, comprising the following steps:
The first step selectes the exceeded plant stand of some power grid short circuit currents, and determines the area of the exceeded plant stand of the short circuit current
Domain route number Z, by Z strip area circuit number are as follows: La, Lb ... Lz, and the initial trend of Z strip area route is calculated, it indicates are as follows:
PLa_0, PLb_0…PLz_0；
Second step, by power grid where the exceeded plant stand of short circuit current, all booting is run, and calculates the exceeded plant stand of short circuit current
Short circuit current initial value IB；What the selection exceeded plant stand of short circuit current was connected directly cut-offs route, and number consecutively is L1, L2 ...
LM is defined as that line set C1 can be cut-off；
Third step, where the exceeded plant stand of short circuit current power grid all booting operation in the case where, by number for L1 can
Route disconnection is cut-off, the short-circuit current value I1 of the exceeded plant stand of short circuit current is calculated, the short circuit current that second step is obtained surpasses
The short circuit current initial value IB of mark plant stand subtracts the short-circuit current value I1 after cut-offfing route for disconnecting that number is L1, obtains disconnecting and compile
Number be L1 short circuit current variation delta I1 after cut-offfing route；The route that cut-offs that number is L2 ... LM is successively disconnected, respectively
It obtains disconnecting short circuit current variation delta I2 ... the Δ IM after cut-offfing route that number is L2 ... LM；
4th step chooses that disconnect number be that L1 ... LM is cut-off after route in short circuit current variation delta I1 ... Δ IM
Maximum value Δ I max and minimum value Δ I min；
5th step, with disconnect number be L1 ... LM cut-off route after short circuit current variable quantity maximum value Δ I max subtract
It goes to disconnect the short circuit current variation delta I1 after cut-offfing route that number is L1, obtained difference, divided by disconnecting number is L1 ... LM
The difference for cut-offfing short circuit current variable quantity maximum value Δ I max and minimum value Δ I min after route, disconnection is calculated and compiles
Number short circuit current variation delta I1 ' is normalized after route for cut-offfing for L1；Disconnection number is successively calculated separately in aforementioned manners
For normalization short circuit current variation delta I2 ' ... the Δ IM ' after cut-offfing route of L2 ... LM；
6th step disconnects the route that cut-offs that number is L1, calculates the trend of Z strip area route, indicates are as follows: P1_1 ...
Pz_1 ；Obtained each trend is compared with the initial trend that the first step obtains, if the trend and initial direction of tide phase
Together, then it subtracts the trend and initial trend to obtain difference, obtains tide of the absolute value of the difference as the strip area route
Flow the absolute value of variable quantity；If the trend and initial direction of tide on the contrary, if the trend and initial trend are obtained as addition and
Value obtains the absolute value of the absolute value of this and value as the change of power flow of the strip area route, and the Z of Z strip area route is a
The absolute value of change of power flow is added, and is obtained the route rear region Line Flow that cut-offs that disconnection number is L1 and is changed total value Δ
P1；
7th step is successively each turned off the route that cut-offs that number is L2 ... LM, repeats the 6th step by step rapid, is calculated point
The route rear region Line Flow that cut-offs for being L2 ... LM Duan Kai not numbered and change total value: Δ P2 ... Δ PM；
8th step, selection disconnect the route rear region Line Flow that cut-offs that number is L1 ... LM and change total value: Δ P1 ...
Maximum value Δ Pmax and minimum value Δ Pmin in Δ PM；
9th step, with disconnect number be L1 cut-off route rear region Line Flow variation total value Δ P1 subtract disconnection compile
Number for L1 ... LM cut-off route rear region Line Flow change total value minimum value Δ Pmin, obtained difference, divided by disconnection
The maximum value Δ Pmax and minimum value Δ Pmin for cut-offfing route rear region Line Flow variation total value that number is L1 ... LM
Difference obtains disconnecting the normalization change of power flow Δ P1 ' cut-off after route that number is L1；Successively being each turned off number is
L2 ... LM's cut-offs route, obtains respective normalization change of power flow Δ P2 ' ... Δ PM '；
Tenth step, the respective heat stable value of Z articles of route of region wire for acquiring the exceeded plant stand of short circuit current, take disconnection to number
For L1 respective trend value on Z route when cut-offfing route, and the heat stable value of respective route and disconnecting is numbered as L1
The trend value for cut-offfing route be compared, if heat stable value be greater than trend value, the penalty value of the strip area route is determined
Justice is 0, if heat stable value is less than trend value, the penalty value of the strip area route is defined as 2；Will be switched off number is L1's
Z penalty value when can cut-off route is added to obtain the steady comprehensive penalty value ε 11 of trend overheat；Above step is repeated, is distinguished
It disconnects trend when cut-offfing route that number is L2 ... LM and overheats steady comprehensive penalty value ε 21 ... ε M1；
11st step, disconnection number are L1 when cut-offfing route, and the Fastest software based on EEAC algorithm is used to calculate
The voltage stability margin of power grid where the exceeded plant stand of short circuit current, if voltage stability margin is greater than 0, voltage penalty value is defined as
0, if voltage stability margin, less than 0, voltage penalty value is defined as 2, obtain disconnecting voltage when cut-offfing route that number is L1
Comprehensive penalty value ε 12；Above step is repeated, obtains being each turned off voltage integrated when cut-offfing route that number is L2 ... LM and punish
Penalties ε 22 ... ε M2；
12nd step will be switched off the normalization short circuit current variation delta I1 ' when cut-offfing route, normalizing that number is L1
Change the steady comprehensive penalty value ε 11 of change of power flow Δ P1 ', trend overheat, the addition of voltage integrated penalty value ε 12, obtains disconnecting number
For comprehensive evaluation value Pr1 when cut-offfing route of L1；Above step is repeated, obtains being each turned off number being opening for L2 ... LM
Comprehensive evaluation value Pr2 ... PrM when broken string road；Comprehensive evaluation value Pr1 ... PrM is subjected to priority ranking, and root from small to large
It is corresponded to according to the sequence and obtains the priority ranking that can cut-off route, which is to inhibit selected plant stand short circuit current broken string
Priority ranking.
The present invention can cut-off route for the exceeded plant stand near region of grid short circuit electric current, combine and consider that short circuit current inhibits effect
The influence of fruit, near region Line Flow variable quantity and hot surely limitation, Network Voltage Stability nargin etc. factors, and to above each factor
Influence is quantified, and the route that cut-offs of the exceeded plant stand of short circuit current has reasonably been carried out priority ranking, is that engineering is real
Plant stand short circuit current is inhibited to provide the judging basis of science in the application of border.
Specific embodiment
The present invention is described in detail below:
A kind of determining method of inhibition grid short circuit electric current broken string sequence considering safety and sensitivity, comprising the following steps:
The first step selectes the exceeded plant stand of some power grid short circuit currents, and determines the area of the exceeded plant stand of the short circuit current
Domain route number Z, by Z strip area circuit number are as follows: La, Lb ... Lz, and the initial trend of Z strip area route is calculated, it indicates are as follows:
PLa_0, PLb_0…PLz_0；
Second step, by power grid where the exceeded plant stand of short circuit current, all booting is run, and calculates the exceeded plant stand of short circuit current
Short circuit current initial value IB；What the selection exceeded plant stand of short circuit current was connected directly cut-offs route, and number consecutively is L1, L2 ...
LM is defined as that line set C1 can be cut-off；
Third step, where the exceeded plant stand of short circuit current power grid all booting operation in the case where, by number for L1 can
Route disconnection is cut-off, the short-circuit current value I1 of the exceeded plant stand of short circuit current is calculated, the short circuit current that second step is obtained surpasses
The short circuit current initial value IB of mark plant stand subtracts the short-circuit current value I1 after cut-offfing route for disconnecting that number is L1, obtains disconnecting and compile
Number be L1 short circuit current variation delta I1 after cut-offfing route；The route that cut-offs that number is L2 ... LM is successively disconnected, respectively
It obtains disconnecting short circuit current variation delta I2 ... the Δ IM after cut-offfing route that number is L2 ... LM；
4th step chooses that disconnect number be that L1 ... LM is cut-off after route in short circuit current variation delta I1 ... Δ IM
Maximum value Δ I max and minimum value Δ I min；
5th step, with disconnect number be L1 ... LM cut-off route after short circuit current variable quantity maximum value Δ I max subtract
It goes to disconnect the short circuit current variation delta I1 after cut-offfing route that number is L1, obtained difference, divided by disconnecting number is L1 ... LM
The difference for cut-offfing short circuit current variable quantity maximum value Δ I max and minimum value Δ I min after route, disconnection is calculated and compiles
Number short circuit current variation delta I1 ' is normalized after route for cut-offfing for L1；Disconnection number is successively calculated separately in aforementioned manners
For normalization short circuit current variation delta I2 ' ... the Δ IM ' after cut-offfing route of L2 ... LM；
6th step disconnects the route that cut-offs that number is L1, calculates the trend of Z strip area route, indicates are as follows: P1_1 ...
Pz_1 ；Obtained each trend is compared with the initial trend that the first step obtains, if the trend and initial direction of tide phase
Together, then it subtracts the trend and initial trend to obtain difference, obtains tide of the absolute value of the difference as the strip area route
Flow the absolute value of variable quantity；If the trend and initial direction of tide on the contrary, if the trend and initial trend are obtained as addition and
Value obtains the absolute value of the absolute value of this and value as the change of power flow of the strip area route, and the Z of Z strip area route is a
The absolute value of change of power flow is added, and is obtained the route rear region Line Flow that cut-offs that disconnection number is L1 and is changed total value Δ
P1；
7th step is successively each turned off the route that cut-offs that number is L2 ... LM, repeats the 6th step by step rapid, is calculated point
The route rear region Line Flow that cut-offs for being L2 ... LM Duan Kai not numbered and change total value: Δ P2 ... Δ PM；
8th step, selection disconnect the route rear region Line Flow that cut-offs that number is L1 ... LM and change total value: Δ P1 ...
Maximum value Δ Pmax and minimum value Δ Pmin in Δ PM；
9th step, with disconnect number be L1 cut-off route rear region Line Flow variation total value Δ P1 subtract disconnection compile
Number for L1 ... LM cut-off route rear region Line Flow change total value minimum value Δ Pmin, obtained difference, divided by disconnection
The maximum value Δ Pmax and minimum value Δ Pmin for cut-offfing route rear region Line Flow variation total value that number is L1 ... LM
Difference obtains disconnecting the normalization change of power flow Δ P1 ' cut-off after route that number is L1；Successively being each turned off number is
L2 ... LM's cut-offs route, obtains respective normalization change of power flow Δ P2 ' ... Δ PM '；
Tenth step, the respective heat stable value of Z articles of route of region wire for acquiring the exceeded plant stand of short circuit current, take disconnection to number
For L1 respective trend value on Z route when cut-offfing route, and the heat stable value of respective route and disconnecting is numbered as L1
The trend value for cut-offfing route be compared, if heat stable value be greater than trend value, the penalty value of the strip area route is determined
Justice is 0, if heat stable value is less than trend value, the penalty value of the strip area route is defined as 2；Will be switched off number is L1's
Z penalty value when can cut-off route is added to obtain the steady comprehensive penalty value ε 11 of trend overheat；Above step is repeated, is distinguished
It disconnects trend when cut-offfing route that number is L2 ... LM and overheats steady comprehensive penalty value ε 21 ... ε M1；
11st step, disconnection number are L1 when cut-offfing route, and the Fastest software based on EEAC algorithm is used to calculate
The voltage stability margin of power grid where the exceeded plant stand of short circuit current, if voltage stability margin is greater than 0, voltage penalty value is defined as
0, if voltage stability margin, less than 0, voltage penalty value is defined as 2, obtain disconnecting voltage when cut-offfing route that number is L1
Comprehensive penalty value ε 12；Above step is repeated, obtains being each turned off voltage integrated when cut-offfing route that number is L2 ... LM and punish
Penalties ε 22 ... ε M2；
12nd step will be switched off the normalization short circuit current variation delta I1 ' when cut-offfing route, normalizing that number is L1
Change the steady comprehensive penalty value ε 11 of change of power flow Δ P1 ', trend overheat, the addition of voltage integrated penalty value ε 12, obtains disconnecting number
For comprehensive evaluation value Pr1 when cut-offfing route of L1；Above step is repeated, obtains being each turned off number being opening for L2 ... LM
Comprehensive evaluation value Pr2 ... PrM when broken string road；Comprehensive evaluation value Pr1 ... PrM is subjected to priority ranking, and root from small to large
It is corresponded to according to the sequence and obtains the priority ranking that can cut-off route, which is to inhibit selected plant stand short circuit current broken string
Priority ranking.
Claims (1)
1. a kind of inhibition grid short circuit electric current broken string sequence for considering safety and sensitivity determines method, comprising the following steps:
The first step selectes the exceeded plant stand of some power grid short circuit currents, and determines the region line of the exceeded plant stand of the short circuit current
Number Z, by Z strip area circuit number are as follows: La, Lb ... Lz, and the initial trend of Z strip area route is calculated, it indicates are as follows: PLa_
0, PLb_0…PLz_0；
Second step, by power grid where the exceeded plant stand of short circuit current, all booting is run, and calculates the short circuit of the exceeded plant stand of short circuit current
Electric current initial value IB；What the selection exceeded plant stand of short circuit current was connected directly cut-offs route, and number consecutively is L1, L2 ... LM,
It is defined as that line set C1 can be cut-off；
Third step, where the exceeded plant stand of short circuit current power grid all booting operation in the case where, cut-offfing for L1 will be numbered
Route disconnects, and the short-circuit current value I1 of the exceeded plant stand of short circuit current, the exceeded factory of the short circuit current that second step is obtained is calculated
The short circuit current initial value IB to stand subtracts the short-circuit current value I1 after cut-offfing route for disconnecting that number is L1, obtains disconnection number and is
The short circuit current variation delta I1 after cut-offfing route of L1；Successively disconnecting number is that L2 ... LM cut-offs route, is respectively obtained
Disconnect short circuit current variation delta I2 ... the Δ IM after cut-offfing route that number is L2 ... LM；
4th step is chosen and disconnects the maximum cut-off after route in short circuit current variation delta I1 ... Δ IM that number is L1 ... LM
It is worth Δ I max and minimum value Δ I min；
5th step, with disconnect number be L1 ... LM cut-off short circuit current variable quantity maximum value Δ I max after route subtract it is disconnected
The number of beginning the compilation of be L1 short circuit current variation delta I1 after cut-offfing route, obtained difference, divided by, disconnect number be L1 ... LM can
The difference for cut-offfing short circuit current variable quantity maximum value Δ I max and minimum value Δ I min after route, disconnection number, which is calculated, is
The normalization short circuit current variation delta I1 ' after cut-offfing route of L1；Successively calculating separately disconnection number in aforementioned manners is
Normalization short circuit current variation delta I2 ' ... the Δ IM ' after cut-offfing route of L2 ... LM；
6th step disconnects the route that cut-offs that number is L1, calculates the trend of Z strip area route, indicates are as follows: P1_1 ... Pz_1；
Obtained each trend is compared with the initial trend that the first step obtains, it, will if the trend is identical as initial direction of tide
The trend and initial trend subtract to obtain difference, obtain change of power flow of the absolute value of the difference as the strip area route
Absolute value；If the trend with initial direction of tide on the contrary, if the trend is obtained the sum value with initial trend as addition, be somebody's turn to do
Absolute value with the absolute value of value as the change of power flow of the strip area route, by Z change of power flow of Z strip area route
Absolute value be added, obtain disconnect number be L1 cut-off route rear region Line Flow variation total value Δ P1；
7th step is successively each turned off the route that cut-offs that number is L2 ... LM, repeats the 6th step by step suddenly, is calculated and breaks respectively
The route rear region Line Flow that cut-offs that the number of beginning the compilation of is L2 ... LM changes total value: Δ P2 ... Δ PM；
8th step, selection disconnect the route rear region Line Flow that cut-offs that number is L1 ... LM and change total value: Δ P1 ... Δ PM
In maximum value Δ Pmax and minimum value Δ Pmin；
9th step, with disconnect number be L1 cut-off route rear region Line Flow variation total value Δ P1 subtract disconnection number be
The minimum value Δ Pmin for cut-offfing route rear region Line Flow variation total value of L1 ... LM, obtained difference are numbered divided by disconnecting
For L1 ... LM cut-off route rear region Line Flow change total value maximum value Δ Pmax and minimum value Δ Pmin difference,
It obtains disconnecting the normalization change of power flow Δ P1 ' cut-off after route that number is L1；Successively being each turned off number is L2 ...
LM's cut-offs route, obtains respective normalization change of power flow Δ P2 ' ... Δ PM '；
Tenth step, the respective heat stable value of Z articles of route of region wire for acquiring the exceeded plant stand of short circuit current, taking disconnection number is L1
Respective trend value on Z route when cut-offfing route, and by the heat stable value of respective route and disconnecting number for L1 can
The trend value for cut-offfing route is compared, if heat stable value is greater than trend value, the penalty value of the strip area route is defined as
0, if heat stable value is less than trend value, the penalty value of the strip area route is defined as 2；Will be switched off number is opening for L1
Z penalty value when broken string road is added to obtain the steady comprehensive penalty value ε 11 of trend overheat；Above step is repeated, is each turned off
Trend when cut-offfing route that number is L2 ... LM overheats steady comprehensive penalty value ε 21 ... ε M1；
11st step, disconnection number are L1 when cut-offfing route, and the Fastest software based on EEAC algorithm is used to calculate short circuit
The voltage stability margin of power grid where the exceeded plant stand of electric current, if voltage stability margin is greater than 0, voltage penalty value is defined as 0, if
Voltage stability margin is less than 0, then voltage penalty value is defined as 2, obtains disconnecting voltage integrated when cut-offfing route that number is L1
Penalty value ε 12；Above step is repeated, obtains being each turned off voltage integrated penalty value when cut-offfing route that number is L2 ... LM
ε22…εM2；
12nd step will be switched off numbering the normalization short circuit current variation delta I1 ' when cut-offfing route for being L1, normalize tide
The steady comprehensive penalty value ε 11 of variation delta P1 ', trend overheat, the addition of voltage integrated penalty value ε 12 are flowed, obtains disconnecting number being L1
Comprehensive evaluation value Pr1 when cut-offfing route；Repeat above step, obtaining being each turned off number is that L2 ... LM cut-offs line
Comprehensive evaluation value Pr2 ... PrM when road；Comprehensive evaluation value Pr1 ... PrM is subjected to priority ranking from small to large, and according to this
Sequence correspondence obtains the priority ranking that can cut-off route, which is that this is inhibited to select the preferential of plant stand short circuit current broken string
Grade sequence.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201711066568.3A CN107732885B (en) | 2017-11-02 | 2017-11-02 | Consider that the inhibition grid short circuit electric current broken string sequence of safety and sensitivity determines method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201711066568.3A CN107732885B (en) | 2017-11-02 | 2017-11-02 | Consider that the inhibition grid short circuit electric current broken string sequence of safety and sensitivity determines method |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN107732885A CN107732885A (en) | 2018-02-23 |
| CN107732885B true CN107732885B (en) | 2019-04-16 |
Family
ID=61221370
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201711066568.3A Active CN107732885B (en) | 2017-11-02 | 2017-11-02 | Consider that the inhibition grid short circuit electric current broken string sequence of safety and sensitivity determines method |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN107732885B (en) |
Family Cites Families (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US8135551B2 (en) * | 2009-02-03 | 2012-03-13 | General Electric Company | Robust on line stator turn fault identification system |
| CN105486978A (en) * | 2015-12-01 | 2016-04-13 | 江苏省电力公司淮安供电公司 | Single-phase short circuit fault line selection method |
| CN206977026U (en) * | 2017-08-02 | 2018-02-06 | 云南海力特电气自动化有限公司 | Low pressure protector for null line breaking based on negative sequence current criterion |
-
2017
- 2017-11-02 CN CN201711066568.3A patent/CN107732885B/en active Active
Also Published As
| Publication number | Publication date |
|---|---|
| CN107732885A (en) | 2018-02-23 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| Erlich et al. | Wind turbine negative sequence current control and its effect on power system protection | |
| Nascimento et al. | An adaptive overcurrent protection system applied to distribution systems | |
| US10536000B2 (en) | Grid independent operation control unit, power conditioner, and grid independent operation control method | |
| CN109193584B (en) | A kind of current protection method of the power distribution network containing distributed photovoltaic power | |
| CN111934280B (en) | Electric leakage fault detection method and device, storage medium and power distribution gateway | |
| CN102916427B (en) | Method for calculating integrated three-phase imbalance degree of multi-circuit transmission lines | |
| CN106684834B (en) | A kind of power distribution network adaptive Current Protection system and method | |
| CN102255294A (en) | Voltage acceleration inverse time-delay over-current protection method used for micro power grid | |
| CN107681644B (en) | A kind of ratiometric dynamic formula current differential protection method of DC bus fault | |
| Kojovic | Coordination of distributed generation and step voltage regulator operations for improved distribution system voltage regulation | |
| CN106711968B (en) | Setting method and system for inverse time limit zero sequence current protection | |
| CN107732885B (en) | Consider that the inhibition grid short circuit electric current broken string sequence of safety and sensitivity determines method | |
| CN110739669B (en) | Inverse time limit overcurrent protection method based on impedance correction | |
| CN101615786B (en) | Grid system protection method based on local information of transformer substation | |
| Chang et al. | Fault identification method based on unified inverse-time characteristic equation for distribution network | |
| CN209329685U (en) | A kind of intelligent electric machine integrated protection controller | |
| CN106611964B (en) | Coordination control method and system for fault ride-through and damping control of doubly-fed wind turbine generator | |
| JP7145011B2 (en) | power conditioner | |
| CN101800414A (en) | Method for judging and protecting low voltage in transformer short circuit fault | |
| Gomez et al. | Distributed generation: Exploitation of islanding operation advantages | |
| CN110537308A (en) | Power conversion device | |
| CN110518555B (en) | Method for realizing random power supply access power distribution network differential protection | |
| JP2007330032A (en) | System interconnection inverter | |
| JP2009043455A (en) | Limiter | |
| CN204349438U (en) | Detect overheating warning harmonic failure circuit breaker |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant |