CN110133434A - It is a kind of that UPFC and fixed series compensation C mixed compensation line protection method are contained based on transient state energy direction - Google Patents
It is a kind of that UPFC and fixed series compensation C mixed compensation line protection method are contained based on transient state energy direction Download PDFInfo
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- CN110133434A CN110133434A CN201910264097.XA CN201910264097A CN110133434A CN 110133434 A CN110133434 A CN 110133434A CN 201910264097 A CN201910264097 A CN 201910264097A CN 110133434 A CN110133434 A CN 110133434A
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
- G01R31/08—Locating faults in cables, transmission lines, or networks
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
- G01R31/08—Locating faults in cables, transmission lines, or networks
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Abstract
The present invention relates to a kind of to contain UPFC and fixed series compensation C mixed compensation line protection method based on transient state energy direction, belongs to Relay Protection Technology in Power System field.When detecting failure, voltage, jump-value of current are obtained according to the transient state electrical quantity that route both ends detect first, secondly instantaneous power is calculated according to the product of transient voltage, jump-value of current, then the integral of instantaneous power is calculated to characterize transient state energy, finally with the polarity tectonic province internal and external fault criterion of transient state energy, realize containing in UPFC and fixed series compensation C mixed compensation line areas and the identification of external area error.The present invention uses UPFC+C mixed compensation mode, and no matter fault point is located at route where, can reliably realize that area's internal and external fault recognizes, realize good power flowcontrol effect.
Description
Technical field
The present invention relates to a kind of to contain UPFC and fixed series compensation C mixed compensation route protection side based on transient state energy direction
Method belongs to Relay Protection Technology in Power System field.
Background technique
In order to meet ever-increasing electric load demand, under the premise of avoiding passway for transmitting electricity from building, promoted as much as possible
The transmission capacity of existing transmission line of electricity, the THE UPFC (UPFC) most powerful with function, characteristic is superior is representative, soft
Property AC transmission equipment (FACTS) is widely applied in the power system.Though UPFC powerful control ability is power train
System operation brings enormous benefits, but its access is brought to relay protection but also electric network fault transient process is increasingly sophisticated
Many new problems, are embodied in the following aspects:
(1) the different influences to relay protection of the infield UPFC and compensation model；
(2) transient state component that UPFC is generated influences relay protection bring；
(3) cause system parameter when UPFC is quickly adjusted quickly changes the influence generated to relay protection.
It can reach effect identical with pure UPFC using the controllable phase shift technology of fixed series capacitor (C)+UPFC, utilize
UPFC and fixed series compensation hybrid plan, can greatly reduce project cost under the premise of reaching comparable power flowcontrol effect.
Summary of the invention
It is mixed containing UPFC and fixed series compensation C based on transient state energy direction that the technical problem to be solved in the present invention is to provide a kind of
Compensated line guard method is closed, to solve the above problems.
The technical scheme is that a kind of contain UPFC and fixed series compensation C mixed compensation line based on transient state energy direction
Road guard method when detecting failure, obtains voltage jump amount Δ u according to the transient state electrical quantity that route both ends detect first
(t), jump-value of current Δ i (t) secondly calculates instantaneous power according to the product of transient voltage, jump-value of current, then calculates
The integral of instantaneous power is E to characterize transient state energy, head end bus bar side transient state energyM, end bus bar side transient state energy is EN,
With the polarity tectonic province internal and external fault criterion of head and end transient state energy；If EM< 0 and ENMN segment fault in the area < 0, Ze Wei, if EM
>=0 and EN< 0, then it is PM segment fault outside system area, if EM< 0 and EN>=0, then it is NQ segment fault outside system area.
Specific steps are as follows:
Step1: when detecting failure, voltage jump amount is obtained according to the transient state electrical quantity that route both ends detect
Jump-value of currentB, c is three phase line；
Step2: instantaneous power P (t) is calculated according to the product of transient voltage, jump-value of current:
P (t)=Δ ua×Δia+Δub×Δib+Δuc×Δic (1)
In formula, a, b, c are three phase line, Δ ua、Δub、ΔucFor three-phase voltage Sudden Changing Rate, Δ ia、Δib、Δic
For three-phase current Sudden Changing Rate；
Step3: the integral on instantaneous power special time period is calculated to characterize transient state energy:
In formula, t indicates a certain moment after failure, and 0 indicates that fault moment, P (t) are instantaneous power, the special time period
For short time-window 3 or 5ms.
Step4: with the polarity tectonic province internal and external fault criterion of transient state energy, realize that the mixing containing UPFC and fixed series compensation C is mended
It repays in line areas and the identification of external area error, specifically:
Rated current positive direction is the direction that bus is directed toward route, when breaking down for MN sections of route:
EM(t)=- EPM(t) (3)
EN(t)=- EPN(t) (4)
In formula, EM(t)、ENIt (t) is respectively the side M, N transient state energy, EPM(t)、EPNIt (t) is respectively system PM、PNIt consumes and deposits
The energy of storage；When existing simultaneously inductance and capacitor in system, there are the exchange of energy, E between inductance and capacitorPM(t)、EPN
(t) any moment after a failure will all store certain energy, i.e. EPM(t)、EPN(t) it is consistently greater than zero.Therefore it obtains:
EM(t) < 0 (5)
EN(t) < 0 (6)
When part of path PM breaks down:
EM(t)=EX(t)+EPN(t) (7)
EN(t)=- EPN(t) (8)
In formula, EX(t)、EPNIt (t) is respectively route and system PNThe energy absorbed；Due to system PNAnd route etc. is passive
Network can only absorb energy, therefore EX(t)、EPN(t) it is not less than zero.It obtains at this time:
EM(t)≥0 (9)
EN(t) < 0 (10)
When part of path NQ breaks down:
EM(t)=- EPM(t) (11)
EN(t)=EX(t)+EPM(t) (12)
In formula, EX(t)、EPMIt (t) is respectively route and system PNThe energy absorbed；Due to system PMAnd route etc. is passive
Network can only absorb energy, therefore EX(t)、EPM(t) it is not less than zero.It obtains at this time:
EM(t) < 0 (13)
EN(t)≥0 (14)
Finally, being judged, criterion are as follows:
If EM(t) < 0 and EN(t) 0 <, MN segment fault in the area Ze Wei；
If EMAnd E (t) >=0N(t) 0 <, PM segment fault outside the area Ze Wei；
If EM(t) < 0 and EN(t) NQ segment fault outside >=area 0, Ze Wei.
The beneficial effects of the present invention are:
(1) UPFC+C mixed compensation mode is used, no matter fault point is located at route where, can reliably realize that area is inside and outside
Fault identification realizes good power flowcontrol effect.
(2) using UPFC and fixed series compensation C hybrid plan, project cost is greatly reduced.
Detailed description of the invention
Fig. 1 is UPFC and fixed series compensation C mixed compensation circuit emulation illustraton of model of the present invention；
Fig. 2 is route transmission power waveform diagram under different compensation conditions in the embodiment of the present invention 1；
Fig. 3 is UPFC+C capacity accounting waveform diagram under mixed compensation mode in the embodiment of the present invention 1；
Fig. 4 is the side M instantaneous power waveform diagram when abort situation is F1 in the embodiment of the present invention 2；
Fig. 5 is the side N instantaneous power waveform diagram when abort situation is F1 in the embodiment of the present invention 2；
Fig. 6 is the side M transient state energy waveform diagram when abort situation is F1 in the embodiment of the present invention 2；
Fig. 7 is the side N transient state energy waveform diagram when abort situation is F1 in the embodiment of the present invention 2；
Fig. 8 is the side M instantaneous power waveform diagram when abort situation is F2 in the embodiment of the present invention 3；
Fig. 9 is the side N instantaneous power waveform diagram when abort situation is F2 in the embodiment of the present invention 3；
Figure 10 is the side M transient state energy waveform diagram when abort situation is F2 in the embodiment of the present invention 3；
Figure 11 is the side N transient state energy waveform diagram when abort situation is F2 in the embodiment of the present invention 3；
Figure 12 is the side M instantaneous power waveform diagram when abort situation is F4 in the embodiment of the present invention 4；
Figure 13 is the side N instantaneous power waveform diagram when abort situation is F4 in the embodiment of the present invention 4；
Figure 14 is the side M transient state energy waveform diagram when abort situation is F4 in the embodiment of the present invention 4；
Figure 15 is the side N transient state energy waveform diagram when abort situation is F4 in the embodiment of the present invention 4.
Specific embodiment
With reference to the accompanying drawings and detailed description, the invention will be further described.
Embodiment 1: certain 220kV is as shown in Figure 1 containing UPFC and fixed series compensation C mixed compensation circuit emulation model；Its route
Parameter is as follows: PM branch route a length of 100km, ME, FN branch route length is 75km, a length of 120km of NQ branch route.Failure
Position: ME branch breaks down away from the end M 30km.Sample frequency is 1MHz.Fixed series compensation C takes 20.5 μ F.Failure initial time t=
0.17s。
As shown in Figure 2, under the conditions of UPFC compensation, UPFC+C mixed compensation, route conveying trend is optimized.Compared with UPFC
Compensation model, UPFC+C mixed compensation mode significantly reduce engineering under the premise of reaching comparable power flowcontrol effect and make
Valence.From the figure 3, it may be seen that UPFC, fixed series compensation C capacity accounting approximation 1:5 can reach preferably power flowcontrol under mixed compensation mode
Effect.
Embodiment 2: certain 220kV is as shown in Figure 1 containing UPFC and fixed series compensation C mixed compensation circuit emulation model；Its route
Parameter is as follows: PM branch route a length of 100km, ME, FN branch route length is 75km, a length of 120km of NQ branch route.Failure
Position: PM branch breaks down away from the end M 10km, 30km, 50km, 70km, 90km.Sample frequency is 1MHz.Fixed series compensation C takes
20.5μF.Failure initial time t=0.17s.
(1) two sides M, N voltage jump amount after being occurred according to the available failure of the first step in specificationAnd electricity
Flow Sudden Changing Rate
(2) it can be sought according to the second step in specification such as Fig. 4, M, N two sides instantaneous power PM (t), PN (t) shown in 5.
(3) integral of instantaneous power PM (t), PN (t) in certain period of time is calculated according to the third step of specification
It obtains such as Fig. 6, M, N two sides transient state energy EM (t), EN (t) shown in 7.
(4) M side transient state energy EM (t)>=0, N side transient state energy EN (t)<0 can determine whether as PM branch trouble outside area.
Embodiment 3: certain 220kV is as shown in Figure 1 containing UPFC and fixed series compensation C mixed compensation circuit emulation model；Its route
Parameter is as follows: PM branch route a length of 100km, ME, FN branch route length is 75km, a length of 120km of NQ branch route.Failure
Position: ME branch breaks down away from the end M 5km, 15km, 25km, 35km, 45km, 55km, 65km.Sample frequency is 1MHz.It is fixed
String mends C and takes 20.5 μ F.Failure initial time t=0.17s.
(1) two sides M, N voltage jump amount after being occurred according to the available failure of the first step in specificationAnd electricity
Flow Sudden Changing Rate
(2) it can be sought according to the second step in specification such as Fig. 8, M, N two sides instantaneous power PM (t), PN (t) shown in 9.
(3) integral of instantaneous power PM (t), PN (t) in certain period of time is calculated according to the third step of specification
It obtains such as Figure 10, M, N two sides transient state energy EM (t), EN (t) shown in 11.
(4) M side transient state energy EM (t) < 0, N side transient state energy EN (t) < 0 can determine whether as MN branch trouble in area.
Embodiment 4: certain 220kV is as shown in Figure 1 containing UPFC and fixed series compensation C mixed compensation circuit emulation model；Its route
Parameter is as follows: PM branch route a length of 100km, ME, FN branch route length is 75km, a length of 120km of NQ branch route.Failure
Position: NQ branch breaks down away from N-terminal 20km, 40km, 60km, 80km, 100km.Sample frequency is 1MHz.Fixed series compensation C takes
20.5μF.Failure initial time t=0.17s.
(1) two sides M, N voltage jump amount after being occurred according to the available failure of the first step in specificationAnd electricity
Flow Sudden Changing Rate
(2) it can be sought according to the second step in specification such as Figure 12, M, N two sides instantaneous power PM (t), PN shown in 13
(t)。
(3) integral of instantaneous power PM (t), PN (t) in certain period of time is calculated according to the third step of specification
It obtains such as Figure 14, M, N two sides transient state energy EM (t), EN (t) shown in 15.
(4) M side transient state energy EM (t)<0, N side transient state energy EN (t)>=0 can determine whether as NQ branch trouble outside area.
In conjunction with attached drawing, the embodiment of the present invention is explained in detail above, but the present invention is not limited to above-mentioned
Embodiment within the knowledge of a person skilled in the art can also be before not departing from present inventive concept
Put that various changes can be made.
Claims (2)
1. a kind of contain UPFC and fixed series compensation C mixed compensation line protection method based on transient state energy direction, it is characterised in that:
When detecting failure, voltage jump amount Δ u (t), current break are obtained according to the transient state electrical quantity that route both ends detect first
It measures Δ i (t), instantaneous power is secondly calculated according to the product of transient voltage, jump-value of current, then calculates the product of instantaneous power
Divide to characterize transient state energy, head end bus bar side transient state energy is EM, end bus bar side transient state energy is EN, temporary with head and end
The polarity tectonic province internal and external fault criterion of state energy；If EM< 0 and ENMN segment fault in the area < 0, Ze Wei, if EM>=0 and EN< 0, then
For PM segment fault outside system area, if EM< 0 and EN>=0, then it is NQ segment fault outside system area.
2. according to claim 1 contain UPFC and fixed series compensation C mixed compensation route protection based on transient state energy direction
Method, it is characterised in that specific steps are as follows:
Step1: when detecting failure, voltage jump amount is obtained according to the transient state electrical quantity that route both ends detectElectric current
Sudden Changing RateB, c is three phase line；
Step2: instantaneous power P (t) is calculated according to the product of transient voltage, jump-value of current:
P (t)=Δ ua×Δia+Δub×Δib+Δuc×Δic (1)
In formula, a, b, c are three phase line, Δ ua、Δub、ΔucFor three-phase voltage Sudden Changing Rate, Δ ia、Δib、ΔicIt is three
Difference of phase currents；
Step3: the integral on instantaneous power special time period is calculated to characterize transient state energy:
In formula, t indicates a certain moment after failure, and 0 indicates that fault moment, P (t) are instantaneous power；
Step4: it with the polarity tectonic province internal and external fault criterion of transient state energy, realizes and contains UPFC and fixed series compensation C mixed compensation line
In the area of road and the identification of external area error, specifically:
Rated current positive direction is the direction that bus is directed toward route, when breaking down for MN sections of route:
EM(t)=- EPM(t) (3)
EN(t)=- EPN(t) (4)
In formula, EM(t)、ENIt (t) is respectively the side M, N transient state energy, EPM(t)、EPNIt (t) is respectively system PM、PNIt consumes and stores
Energy；
When part of path PM breaks down:
EM(t)=EX(t)+EPN(t) (5)
EN(t)=- EPN(t) (6)
In formula, EX(t)、EPNIt (t) is respectively route and system PNThe energy absorbed；
When part of path NQ breaks down:
EM(t)=- EPM(t) (7)
EN(t)=EX(t)+EPM(t) (8)
In formula, EX(t)、EPMIt (t) is respectively route and system PNThe energy absorbed；
Finally, being judged, criterion are as follows:
If EM(t) < 0 and EN(t) 0 <, MN segment fault in the area Ze Wei；
If EMAnd E (t) >=0N(t) 0 <, PM segment fault outside the area Ze Wei；
If EM(t) < 0 and EN(t) NQ segment fault outside >=area 0, Ze Wei.
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Cited By (1)
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| CN113092950A (en) * | 2021-05-17 | 2021-07-09 | 重庆大学 | Fault identification method for double-end protection of direct-current power grid |
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Application publication date: 20190816 |