CN104333043A - Method for evaluating influence, on three-section-type current protection of distribution network, of distributed-type power source connection - Google Patents
Method for evaluating influence, on three-section-type current protection of distribution network, of distributed-type power source connection Download PDFInfo
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- CN104333043A CN104333043A CN201410665645.7A CN201410665645A CN104333043A CN 104333043 A CN104333043 A CN 104333043A CN 201410665645 A CN201410665645 A CN 201410665645A CN 104333043 A CN104333043 A CN 104333043A
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J3/00—Circuit arrangements for ac mains or ac distribution networks
- H02J3/38—Arrangements for parallely feeding a single network by two or more generators, converters or transformers
- H02J3/381—Dispersed generators
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J2203/00—Indexing scheme relating to details of circuit arrangements for AC mains or AC distribution networks
- H02J2203/20—Simulating, e g planning, reliability check, modelling or computer assisted design [CAD]
Abstract
The invention discloses a method for evaluating influence, on three-section-type current protection of a distribution network, of distributed-type power source connection. The method is realized on the basis of a rule library, a plurality of rule steps which are executed sequentially are contained in the rule library, these general semantic rules are suitable for any distribution network systems and distributed-type power source connection conditions, each rule guides an operator how to construct a short-circuit scene through descriptive language and select which protection I, II or III sections for verification; in this way, the operator does not need to analyze and determine checking steps according to a studied system and can efficiently and accurately judge influence, on protection, of distributed-type power source connection schemes by only sequentially executing the rule steps in the rule library; when all rules in the rule library are checked successfully one by one, correct action that the distributed-type power source connection schemes do not influence protection can be judged; otherwise, protection may refuse to act or mistakenly act. Consequently, inaccurate checking conclusions caused by the fact that analyzing level of the operator is limited can be avoided.
Description
Technical field
The invention belongs to the assessment technology field that distributed power source affects power distribution network, particularly relate to the access of a kind of distributed power source to the appraisal procedure of distribution three-step charging impact.
Background technology
The centralized single electric power system that the electric power system of current China is all is principal character with large-sized unit, bulk power grid, high voltage, the disturbance that in bulk power grid, any point fault produces all can affect greatly whole electrical network, Local Accidents very easily expands as large area power grid accident, large-area power-cuts or even Tie-line Opening may be caused time serious, cause catastrophic effect.In addition, because centralized bulk power grid can not follow the tracks of the change of electric load, the cost of building power plant in order to of short duration peak load is huge, and economic benefit is also very low.Therefore experts and scholars propose the concept of distributed power generation both at home and abroad.
With solar power generation, wind power generation, small size gas turbine, fuel cell etc. for the distributed power source of representative has obtained increasing application.But, after distributed power source access distribution network systems, change the direction of tide of the single supply of original power distribution network, radial structure and system, make it to become multiterminal electric supply system, during line fault, system power supply and distributed power source provide short circuit current to fault point simultaneously, change the node short-circuit current level of power distribution network.Because distributed power source access increases helping of short circuit current or draws stream effect, the short circuit current flowing through protective device may increase or reduce, and when access exceedes certain capacity, tripping or malfunction will occur current protection.Therefore, along with the extensive access of distributed power source, in the urgent need to assessing its impact on power distribution network accurately and efficiently, to ensure that the reliable and economic of power distribution network is run.
Summary of the invention
For prior art Problems existing, the invention provides a kind of distributed power source access of precise and high efficiency to the appraisal procedure of distribution three-step charging impact.
For solving the problems of the technologies described above, the present invention adopts following technical scheme:
Distributed power source access, on the appraisal procedure of distribution three-step charging impact, is characterized in:
Obtain distributed power source distribution situation on actual distribution network system structure and each feeder line, suppose feeder line a bus accesses n distributed power source, be designated as successively to feeder line downstream from system power supply end
assess distributed power source that feeder line distributes respectively for each feeder line on the impact of the protection that feeder line distributes, comprise the impact of assessment distributed power source on protection I section, be specially:
Analyzed to system power supply extreme direction by feeder line downstream, make regular i corresponding
downstream distance
nearest bus is short-circuited the short circuit scene of fault, calculates and flow through under the short circuit scene that regular i is corresponding
downstream distance
the short circuit current of nearest protection
if decision condition under the short circuit scene of strictly all rules
all set up, then distributed power source accesses the I section protected without impact; Otherwise, have impact to the I section of protection; Wherein,
for
downstream distance
the I segment protect setting value of nearest protection, i=1,2 ... n.
The appraisal procedure of above-mentioned distributed power source access on the impact of distribution three-step charging also comprises the impact of assessment distributed power source on protection II section:
By system power supply end to feeder line downstream Orientation, order rule (n+i) is corresponding
upstream distance
nearest bus is short-circuited the short circuit scene of fault, calculates and flow through under the short circuit scene that rule (n+i) is corresponding
upstream distance
the short circuit current of nearest protection
if decision condition under the short circuit scene of strictly all rules
all set up, then distributed power source accesses the II section protected without impact; Otherwise, have impact to the II section of protection; Wherein,
for
upstream distance
the II segment protect setting value of nearest protection, i=1,2 ... n.
The appraisal procedure of above-mentioned distributed power source access on the impact of distribution three-step charging also comprises the impact of assessment distributed power source on protection III section:
By system power supply end to feeder line downstream Orientation, order rule (2n+i) is corresponding
downstream distance
nearest bus is short-circuited the short circuit scene of fault, calculates and flow through under the short circuit scene that rule (2n+i) is corresponding
upstream distance
the short circuit current of nearest protection; When flowing through
upstream distance
when the short circuit current of nearest protection equals the III section operating value of this protection just, now
access capacity namely
critical capacity S
imax; If decision condition S under the short circuit scene of strictly all rules
imax> S
dGiall set up, i=1,2 ... n, then distributed power source accesses the III section protected without impact; Otherwise, have impact to the III section of protection; Wherein, S
dGifor
actual access capacity.
Preferably, first, the impact of distributed power source on protection I section is assessed; Secondly, assessment distributed power source is on the impact of protection II section; Finally, the impact of distributed power source on protection III section is assessed.
The present invention is based on rule base to realize; the rule step that some orders perform is comprised in rule base; these general semantic ruleses are applicable to arbitrary distribution network systems and distributed power source access situation; and every rule instructs operator by descriptive language, and how this constructs short circuit scene, and I, II or III section which selects protect verifies.Like this, operator need not analyze according to studied system and determine to check step, as long as order executing rule storehouse in rule step just can judge efficiently and accurately distributed power source access scheme on protection impact: when the strictly all rules in rule base verify one by one by time, can judge that distributed power source access scheme can not affect the correct operation of protection; Otherwise protection then may tripping or malfunction.So can avoid and that cause inaccurate verification conclusion limited due to operator's analysis level.
Accompanying drawing explanation
Fig. 1 is the system construction drawing of single distributed power source access power distribution network;
Fig. 2 ~ 3 are the system construction drawing of many distributed power sources access power distribution network;
Fig. 4 is specific works flow process figure of the present invention;
Fig. 5 is that distributed power source critical capacity calculates schematic diagram.
Embodiment
To be described in detail to the inventive method and embodiment thereof below.
The present invention is based on actual distribution network system; by distributed power source of deriving in detail (DG) on impact feeder line being protected I section, II section and III section, extensively obtain in general distribution network system, analyzing DG and access the practical semantic rules storehouse that traditional three-step charging is affected.
Derivation is as follows:
Fig. 1 is that single distributed power source accesses certain 10kV power distribution network schematic diagram; this power distribution network is made up of two feeder lines (feeder line 1 and feeder line 2); bus 4 and bus 10 lay respectively at the end of feeder line 1 and feeder line 2; directly be connected with load, the protection 1 above circuit breaker, protection 2 ..., protect 9 number consecutivelies to be R
1, R
2..., R
9, be three-step charging, and adjust in a traditional way, do not consider the access of DG.The present invention sorts out impact analysis process by according to short trouble relative to the position of DG, and first from single DG accesses power distribution network bus 7, and then be generalized to the vague generalization situation of many DG.
(1) short trouble occurs in DG downstream
When fault that circuit 8-9 is short-circuited, should by R
8action excision fault, but provide fault current to short dot after DG access together with system power supply, may R be caused
7i segment protect scope extend to next section of circuit (the present invention only discusses the situation that protection range extends to next section of adjacent lines), thus lose selectivity.Meanwhile, each point on circuit 8-9, the nearest point (i.e. bus 8 place) of distance DG flows through R when the large mode of system issues raw three-phase shortcircuit (f3)
7short circuit current I
7maximum.Therefore, ensure that DG can not cause R
7misoperation requires that this flows through R
7short circuit current be less than R
7i section setting value: namely
DG is to the corresponding increase of the protection range helping increasing effect to cause downstream respectively to be protected of downstream fault point short circuit current.Except upper piecewise analysis, also R may be there is instinctively
8i segment protect scope exceed circuit 8-9 total length, R
7iI segment protect scope more than R
8i segment protect scope etc. cause the situation of protection misoperation.Therefore, be necessary to be unfolded as follows analytical derivation process: suppose R
7and R
8there is three phase short circuit fault respectively in the tail end line of place circuit, flow through protection R
7and R
8short circuit current and R
7and R
8i section setting value be respectively:
In formula (1) ~ (4):
I
7and I
8be respectively and flow through protection R
7and R
8short circuit current;
with
be respectively protection R
7and R
8i section setting value;
E
sdand X
sdbe respectively equivalent potential and the equivalent reactance of the dual power supply system of DG and system power supply composition;
K is the safety factor of transient current fast tripping protection, generally gets 1.2 ~ 1.3;
E
sand X
sbe respectively built-in potential and the reactance of system power supply, and E
sd=E
s;
X
15for the reactance of circuit 1-5;
X
56for the reactance of circuit 5-6;
X
67for the reactance of circuit 6-7;
X
78for the reactance of circuit 7-8;
X
89for the reactance of circuit 8-9.
As protection R
7there is three phase short circuit fault, R in the latter end circuit of place circuit
7the lucky action of I section, namely
can obtain:
By X
sdsubstitution formula (3), can obtain:
Can be obtained by formula (4) and formula (6)
this means at protection R
9exit occur three-phase shortcircuit time, protection R
8i section can not misoperation.In like manner, above-mentioned derivation is equally applicable to judge R
9i section can not the misoperation because of DG.Therefore, can obtaining as drawn a conclusion: if there are two and Above Transmission Lines in the downstream of DG, only need ensure that the I segment protect scope of the protection that distance DG is nearest does not extend to next section of circuit, the I section of other protections of downstream all can correct operation.In addition, according to setting principle, R
7iI section setting value be necessarily greater than R
8i section setting value.Although the access of DG causes R
7iI segment protect scope increase, but at R
8there is triggering R scarcely in downstream
7iI section and do not trigger R
8the fault zone of I section.So, due to R
7protection range increase and occur that this situation of misoperation does not also exist, and same inference be applicable to DG downstream other protection II sections.In sum, after DG line attachment 7, ensure that the constraints of DG downstream protection correct operation is
Many DG access power distribution network simultaneously, and on the I section of protection, to affect situation similar to single DG, sees Fig. 2, DG
3for most downstream DG, DG
2for downstream DG, DG second from the bottom
1for downstream DG third from the bottom: as long as ensure DG
3the protection R that (i.e. most downstream DG) downstream is nearest apart from it
4i segment protect scope be no more than R
4place total track length, then DG
3the all protections in downstream are energy correct operation all; As long as ensure DG
2the protection R that (i.e. downstream DG second from the bottom) downstream is nearest apart from it
3i segment protect scope be no more than R
3place total track length, then work as DG
2downstream be short-circuited fault time, all protections between fault point to this downstream DG second from the bottom all can correct operation; Ensure DG
1the protection R that (i.e. downstream DG third from the bottom) downstream is nearest apart from it
2i segment protect scope be no more than R
2place total track length, then work as DG
1downstream be short-circuited fault time, all protections between fault point to this downstream DG third from the bottom all can correct operation.When same feeder line accessing more than 3 of DG number, analogize by said process until most upstream DG.
(2) short trouble occurs in DG upstream
See Fig. 1, DG lines upstream be short-circuited fault time, the protection of DG upstream may the misoperation because flowing through reverse fault electric current.Such as: circuit 5-6 is short-circuited, likely cause protecting R
6misoperation.R in all protections of DG upstream
6iI section setting value minimum, meanwhile, during bus 6 short circuit nearest apart from it of DG upstream, (f1) flows through R
6short circuit current I
6maximum.Therefore, as long as ensure R
6iI section setting value
be greater than this and flow through R
6short circuit current I
6, namely
r
6just can correct operation, i.e. not misoperation, and other protections of DG upstream all can not misoperation.
The analytical derivation process that many DG access power distribution network is similar to single DG, sees Fig. 3, DG
1for most upstream DG, DG
2for upstream the 2nd DG, DG
3for upstream the 3rd DG: as long as ensure DG
1the II section not malfunction of the protection that (i.e. most upstream DG) upstream is nearest apart from it, i.e. R
3not malfunction, R
3the criterion of not malfunction is: R
3iI section setting value be greater than when three-phase shortcircuit occurs bus 3 and flow through R
3short circuit current, then DG
1optional position, upstream be short-circuited fault time, all protections in its upstream all can correct operation; As long as ensure DG
2the II section not malfunction of the protection that (i.e. upstream the 2nd DG) upstream is nearest apart from it, i.e. R
4not malfunction, then DG
2when optional position, upstream is short-circuited, the equal correct operation of all protections between fault point to this upstream the 2nd DG, i.e. not misoperation; Same, only have DG
3the protection R that (i.e. upstream the 3rd DG) upstream is nearest apart from it
5the not malfunction of II section, then DG
3when optional position, upstream is short-circuited, all protections all not malfunctions between fault point to this upstream the 3rd DG.When same feeder line accessing more than 3 of DG number, analogize by said process until most downstream DG.
For the protection of DG upstream, when DG downstream fault, the short circuit current flowing through the protection of DG upstream will reduce, and DG capacity is larger, and short circuit current reduces more; And the short circuit current flowing through the protection of DG upstream may be less than the III section initiation value of protection, cause occurring misaction during the backup protection far away of this protection as adjacent lines.When the backup protection far away protecting III section as adjacent lines, require that at least protection is to the total length of next section of adjacent lines.Get critical condition analysis; when the III segment protect scope of R6 is contracted to circuit 7-8 end just; namely during bus 8 short circuit; the short circuit current flowing through protection R6 equals its III section initiation value just; the DG capacity calculated is its critical capacity, can ensure that the III section of R6 is as backup protection not tripping far away when namely the actual access capacity of DG is less than this critical capacity.It should be noted that: the operating current of adjusting of the III section due to protection is general all less, so the DG critical capacity calculated according to the method described above is far longer than the actual access capacity of DG usually.
(3) short trouble occurs in DG adjacent lines
In Fig. 1, when the adjacent lines of DG place feeder line is short-circuited fault, the access of DG increases short circuit current adjacent lines protected and flows through theoretically, likely makes protection misoperation.Such as: be short-circuited fault on circuit 2-3, R is protected
1flow through the short circuit current that DG and system power supply provide, R simultaneously
1i segment protect scope likely expand adjacent lines to.But actual conditions are analyzed as follows: the equivalent potential E of DG and system power supply
sdwith equivalent reactance X
sdbe respectively:
In formula (7) ~ (8), X
dgfor the equivalent reactance of DG, E
dfor the magnitude of voltage of DG.
Because X
s< < X
dg+ X
15+ X
56+ X
67, can E be obtained
sd≈ 1, X
sd≈ X
s, show to flow through the impact that the short circuit current that adjacent lines is protected is not subject to DG substantially.In fact, power distribution network situation is accessed for many DG, above-mentioned conclusion is still set up, this is mainly because DG built-in potential will be far longer than the transfger impedance of system power supply built-in potential to short dot relative to the transfger impedance of short dot on adjacent lines, and therefore the former short circuit current that provides is negligible for the latter.
The inventive method realizes based on above-mentioned derivation, and concrete steps are as follows:
Step 1, obtain actual distribution network system structure and distributed power source access situation, described distributed power source access situation comprises distributed power source access capacity, access quantity and on-position.
With each feeder line of distribution network system for research object is analyzed respectively, suppose certain feeder line access n distributed power source, arrange successively to feeder line downstream from system power supply end, be designated as DG respectively
1, DG
2, DG
3... DG
n, corresponding access capacity is followed successively by S
dG1, S
dG2... S
dGn.
Step 2, DG is on impact feeder line being protected I section and II section in assessment.
Under different short circuit scene of deriving, feeder line is protected the decision condition of correct operation, derivation is as follows:
Step 2.1, is analyzed to system power supply extreme direction by feeder line downstream, rule 1 ~ n corresponding DG respectively
n, DG
n-1... DG
1the distance bus nearest apart from it in downstream is short-circuited the short circuit scene of fault, i.e. the corresponding DG of regular i
idownstream distance DG
inearest bus is short-circuited the short circuit scene of fault, i=1, and 2 ... n.
First, verification rule 1, flows through DG under calculating corresponding short circuit scene
nthe downstream protection nearest apart from it (is designated as F
1) short circuit current, be designated as
for ensureing DG
ncorrect operation is respectively protected in downstream, makes the short circuit current flowing through protection F1 be less than protection F
1i segment protect setting value
namely the decision condition of rule 1 is
if rule 1 does not meet decision condition, verification stops, and illustrates that DG access makes the misoperation of power distribution network current protection; If meet decision condition, then continue verification rule 2.
Verification all meets decision condition to regular n in this way, namely
all satisfied, then show that DG accesses power distribution network and can not impact the I segment protect of protection, the II segment protect of next verification protection.
Step 2.2, by system power supply end to feeder line downstream Orientation, rule (n+1) ~ 2n corresponding DG respectively
1, DG
2... DG
nthe upstream bus nearest apart from it is short-circuited the short circuit scene of fault, i.e. rule (n+i) corresponding DG
iupstream distance DG
inearest bus is short-circuited the short circuit scene of fault, i=1, and 2 ... n.
First, verification rule (n+1), flows through DG under calculating corresponding short circuit scene
1upstream distance DG
1nearest protection (is designated as B
1) short circuit current, be designated as
for ensureing DG
1correct operation is respectively protected in upstream, makes to flow through protection B
1short circuit current be less than protection B
1iI segment protect setting value
namely the decision condition of rule (n+1) is
if rule (n+1) does not meet decision condition, verification stops, and illustrates that DG access makes the misoperation of power distribution network current protection; If meet decision condition, then continue the regular n+2 of verification.
Verification all meets decision condition to regular 2n in this way, namely
all satisfied, then show that DG accesses power distribution network and can not impact the II segment protect of protection, next verify the III segment protect of protection according to step 3; Otherwise show that DG access has impact to three-step charging, this DG access scheme will cause protection misoperation.
Step 3, DG is on impact feeder line being protected III section in assessment.
When the III section of DG upstream protection is as the backup protection far away of adjacent lines, requires that at least protection is to the total length of next section of adjacent lines, calculate
critical capacity, be designated as S respectively
1max, S
2max... S
nmax.If the actual access capacity of DG is all less than its critical capacity, i.e. S
1max> S
dG1, S
2max> S
dG2... S
nmax> S
dGnall satisfied, then DG access can not have an impact to the III section of protection; Otherwise, then show that DG access scheme will cause the misoperation of III segment protect.
The acquisition methods of DG critical capacity is as follows:
Step 3.1, by system power supply end to feeder line downstream Orientation: rule (2n+1) ~ 3n corresponding DG respectively
1, DG
2... DG
nthe short circuit scene of fault that the bus that downstream is nearest apart from it is short-circuited.First, regular 2n+1 is verified, by DG
1the upstream protection nearest apart from it is labeled as B
1, calculate the corresponding dirty overprotection B of short circuit scene
1short circuit current.
Step 3.2, when flowing through protection B
1short circuit current just equal protect B
1iII section operating value time, calculate now DG
1access capacity S
1max, i.e. DG
1critical capacity.
Step 3.3, for ensureing DG
1the III segment protect correct operation of upstream protection, makes DG
1actual access capacity S
dG1be less than its critical capacity, namely the decision condition of regular 2n+1 is S
1max> S
dG1.If regular 2n+1 does not meet decision condition, verification stops, and illustrates that DG access makes the misoperation of power distribution network current protection; If regular 2n+1 meets decision condition, then continue the regular 2n+2 of verification.
Method verification is until regular 3n like this, then show that DG accesses power distribution network and can not impact III segment protect.
DG downstream be short-circuited fault time; DG can produce the short circuit current flowing through the protection of its upstream and draw stream effect; the short circuit current of protection reduces with the increase of DG access capacity; when the short circuit current flowing through protection of trying to achieve in step 3.1 equals the III section operating value of this protection just, the DG calculated
1, DG
2... DG
ncapacity is its critical capacity, and the III section that can ensure when namely the actual access capacity of DG is less than this critical capacity is as backup protection not tripping far away.
According to power system analysis software BPA; the increase obtained along with distributed power source (DG) access capacity can be emulated; the graph of relation that the short circuit current flowing through protection reduces thereupon; when short circuit current equals the III section operating current protected just; now the access capacity of DG and the critical capacity of DG, be shown in the abscissa of two intersections of complex curve in Fig. 5.
Practical experience shows; decision condition about protection I section least easily meets; decision condition about protection III section then more easily meets; therefore; consider cost of saving time; preferred version of the present invention is: first assess the image of DG to protection I section, secondly assessment DG is on the impact of protection II section, finally assesses the impact of DG on protection III section.
By above rule base method, finally complete distributed power source access to the analysis of distribution three-step charging impact.The method eliminates all non-essential checking procedures; operator need not analyze according to studied system and determine to check step; as long as the semantic rules in order executing rule storehouse just can judge the impact of DG access scheme on protection efficiently and accurately, so and that cause inaccurate verification conclusion limited due to operator's analysis level will be avoided.
Specific embodiment described herein is only to the explanation for example of the present invention's spirit.Those skilled in the art can make various amendment or supplement or adopt similar mode to substitute to described specific embodiment, but can't depart from spirit of the present invention or surmount the scope that appended claims defines.
Claims (4)
1. distributed power source access is on the appraisal procedure of distribution three-step charging impact, it is characterized in that:
Obtain distributed power source distribution situation on actual distribution network system structure and each feeder line, suppose feeder line a bus accesses n distributed power source, be designated as successively to feeder line downstream from system power supply end
assess distributed power source that feeder line distributes respectively for each feeder line on the impact of the protection that feeder line distributes, comprise the impact of assessment distributed power source on protection I section, be specially:
Analyzed to system power supply extreme direction by feeder line downstream, make regular i corresponding
downstream distance
nearest bus is short-circuited the short circuit scene of fault, calculates and flow through under the short circuit scene that regular i is corresponding
downstream distance
the short circuit current of nearest protection
if decision condition under the short circuit scene of strictly all rules
all set up, then distributed power source accesses the I section protected without impact; Otherwise, have impact to the I section of protection; Wherein,
for
downstream distance
the I segment protect setting value of nearest protection, i=1,2 ... n.
2. distributed power source access as claimed in claim 1 is on the appraisal procedure of distribution three-step charging impact, it is characterized in that:
Also comprise the impact of assessment distributed power source on protection II section:
By system power supply end to feeder line downstream Orientation, order rule (n+i) is corresponding
upstream distance
nearest bus is short-circuited the short circuit scene of fault, calculates and flow through under the short circuit scene that rule (n+i) is corresponding
upstream distance
the short circuit current of nearest protection
if decision condition under the short circuit scene of strictly all rules
all set up, then distributed power source accesses the II section protected without impact; Otherwise, have impact to the II section of protection; Wherein,
for
upstream distance
the II segment protect setting value of nearest protection, i=1,2 ... n.
3. distributed power source access as claimed in claim 2 is on the appraisal procedure of distribution three-step charging impact, it is characterized in that:
Also comprise the impact of assessment distributed power source on protection III section:
By system power supply end to feeder line downstream Orientation, order rule (2n+i) is corresponding
downstream distance
nearest bus is short-circuited the short circuit scene of fault, calculates and flow through under the short circuit scene that rule (2n+i) is corresponding
upstream distance
the short circuit current of nearest protection; When flowing through
upstream distance
when the short circuit current of nearest protection equals the III section operating value of this protection just, now
access capacity namely
critical capacity S
imax; If decision condition S under the short circuit scene of strictly all rules
imax> S
dGiall set up, i=1,2 ... n, then distributed power source accesses the III section protected without impact; Otherwise, have impact to the III section of protection; Wherein, S
dGifor
actual access capacity.
4. distributed power source access as claimed in claim 1 is on the appraisal procedure of distribution three-step charging impact, it is characterized in that:
First, the impact of distributed power source on protection I section is assessed; Secondly, assessment distributed power source is on the impact of protection II section; Finally, the impact of distributed power source on protection III section is assessed.
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| CN107607822A (en) * | 2017-10-27 | 2018-01-19 | 南方电网科学研究院有限责任公司 | A kind of power distribution network adaptive Current Protection Performance Test System and method |
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| CN110581566B (en) * | 2019-08-02 | 2021-04-20 | 国网安徽省电力有限公司 | Method and device for evaluating accessible capacity of distributed photovoltaic power supply |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102882197A (en) * | 2012-10-30 | 2013-01-16 | 山东电力集团公司烟台供电公司 | DG (distributed generation)-containing power distribution network distributed protection and control method |
| CN103532158A (en) * | 2013-10-28 | 2014-01-22 | 浙江南都电源动力股份有限公司 | Micro-grid new energy hybrid energy storage system |
-
2014
- 2014-11-19 CN CN201410665645.7A patent/CN104333043B/en active Active
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102882197A (en) * | 2012-10-30 | 2013-01-16 | 山东电力集团公司烟台供电公司 | DG (distributed generation)-containing power distribution network distributed protection and control method |
| CN103532158A (en) * | 2013-10-28 | 2014-01-22 | 浙江南都电源动力股份有限公司 | Micro-grid new energy hybrid energy storage system |
Non-Patent Citations (3)
| Title |
|---|
| 冯希科等: "DG容量对配电网电流保护的影响及对策研究", 《电力系统保护与控制》 * |
| 王江海等: "考虑继电保护动作的分布式电源在配电网中的准入容量研究", 《中国电机工程学报》 * |
| 赵文龙等: "考虑极端情况的分布式电源对配电网保护影响评估方法", 《山东理工大学学报（自然科学版）》 * |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107607822A (en) * | 2017-10-27 | 2018-01-19 | 南方电网科学研究院有限责任公司 | A kind of power distribution network adaptive Current Protection Performance Test System and method |
| CN107607822B (en) * | 2017-10-27 | 2019-08-27 | 南方电网科学研究院有限责任公司 | A kind of power distribution network adaptive Current Protection Performance Test System and method |
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