CN103022993A - Adaptive cascade direction interlocking relaying method based on GOOSE (Generic Object Oriented Substation Event) - Google Patents
Adaptive cascade direction interlocking relaying method based on GOOSE (Generic Object Oriented Substation Event) Download PDFInfo
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Abstract
The invention relates to an adaptive cascade direction interlocking relaying method based on GOOSE (Generic Object Oriented Substation Event), which comprises the following steps: 1) initial interlocking directions of protective relays are set according to an initial interlocking direction tuning rule; 2) a directional element judges the direction of a current fault current which is compared with the initial interlocking directions by a direction comparator to judge whether the directions of two parts are the same, if yes, the step 3) is carried out, if not, IN2 is gated, and a interlocking signal is output to OUT2; 3) the direction comparator gates IN1, and outputs the interlocking signal to the OUT1 and the direction of the output signal is opposite from the initial interlocking direction at this time; 4) a receiving virtual terminal judges whether the interlocking signal is received, if yes, the interlocking is carried, if not, the step 5) is carried out; and 5) an over-current element judges whether the current fault current exceeds a local over-current protection starting fixed value, if yes, a trip signal is sent. In comparison with the prior art, the method has the advantages that the safe and reliable operation of a system is ensured and applicability is good.
Description
Technical field
The present invention relates to a kind of guard method of intelligent distribution network, especially relate to a kind of self adaptation cascade direction locking relay protecting method based on GOOSE.
Background technology
The tradition power distribution network adopts the Radiation topology, and by the single-side power power supply, its relaying protection also is to design as the basis take this framework.
Yet for the intelligent distribution network of a large amount of distributed power sources of access (Distributed Generation, DG), obviously change will occur in operation characteristic, such as the variation of to and fro flow of power, annular electric supply and short circuit current feature etc.Because the fault point both-end all has fault current to flow into, will cause fault current to flow through and protect malfunction on the way everywhere, this has brought very large challenge to existing protection system.
Whether depend on the communication technology according to protection philosophy, existing intelligent distribution network protection scheme can be divided into two large classes.First kind protection scheme only utilizes the information that gathers in the station, owing to do not rely on interior communication, so having a clear superiority in aspect reliability and the cost.But because power distribution network geographical distribution zone is little, circuit is short, so that no matter adopt the phasors such as voltage, electric current, impedance or admittance as characteristic quantity, definite value cooperates all very difficult, is difficult to correctly identify internal fault external fault.And for only utilize the line one-end electric parameters without path protection, for the closed loop power distribution network that contains distributed power source, system's degree of unbalance principle is not suitable for symmetrical fault, and there is the difficulty of adjusting in electric current Abrupt Change principle.So for situations such as symmetric fault and different DG permeabilities, the adaptivity of this scheme and reliability still need make further research.
The Equations of The Second Kind protection scheme needs to utilize between the protections at different levels communication exchange real time information.According to the type of institute's exchange message, can be divided into two classes again.One class exchange analog quantity information, as utilize the digital differential relaying protection philosophy to realize little electric network protection.But this scheme need to overcome in synchronized sampling, two/a large amount of sample information of multiterminal real-time, interactive, the power distribution network problems such as equipment differs greatly, and in the recent period practical have a very large difficulty.Another kind of only exchange logic amount information such as the discriminating direction result of protection, owing to need not synchronized sampling and low to the communication bandwidth requirement, possesses higher practicality.But breaking down for distribution substation low-voltage side bus and microgrid points of common connection place, it does not have good solution.
Summary of the invention
Purpose of the present invention is exactly to provide a kind of system safety reliability service, self adaptation cascade direction locking relay protecting method based on GOOSE (GOOSE-based Adaptive Directional Interlocking Scheme is called for short GADIS) that applicability is good of guaranteeing for the defective that overcomes above-mentioned prior art existence.The method can adapt to the closed loop power distribution network that contains a plurality of microgrids, when distribution network line and bus, microgrid internal bus and power distribution network points of common connection etc. are located to break down, all can excise fast fault.
Purpose of the present invention can be achieved through the following technical solutions:
A kind of self adaptation cascade direction locking relay protecting method based on GOOSE, the method utilizes the realization of self adaptation cascade direction locking strategy to contain the relaying protection of the intelligent distribution network of distributed power source access, be provided with many cover protected locations in the described intelligent distribution network, transmit block signal by the GOOSE agreement between described many cover protected locations, described protected location comprises direction component, overcurrent element, direction comparator, sends empty terminal and the empty terminal of reception; Described method specifically may further comprise the steps:
1) the initial locking direction tuning rule of basis is set the initial locking direction of each protected location;
2) direction component is differentiated current fault current direction, and the direction comparator compares itself and initial locking direction, judges whether the two direction is identical, if, then execution in step 3), if not, then by sending empty terminal output and the initial equidirectional block signal of locking direction;
3) the direction comparator is by sending empty terminal output and the initial reciprocal block signal of locking direction;
4) receive empty terminal and judge whether to receive block signal, if, then locking, if not, then execution in step 5);
5) overcurrent element judges whether current fault current surpasses local overcurrent protection starting definite value, if then send trip signal.
The empty terminal of described transmission and the empty terminal of reception are provided with two groups, four, send respectively block signal to the circuit upstream and downstream.
Described initial locking direction tuning rule is specially:
The initial locking direction of the protected location of line-breaker is (away from transformer station) directed upstream (near transformer station) from the downstream in A, the looped network;
B, DG are incorporated into the power networks the initial locking direction of protected location of circuit breaker for point to DG from circuit;
The initial locking direction of the protected location of C, distribution substation circuit breaker is for pointing to large electrical network.
During described intelligent distribution network abnormal, process in the following manner:
A, protected location utilize the heartbeat message mechanism of GOOSE to carry out channel selftest, in case detect communication failure, then independently increase the outlet time-delay definite value of trip signal, send simultaneously alarm signal, after detecting communication normally, the instantaneous outlet time-delay definite value with trip signal of protected location is returned original value;
If the b breaker failure, then malfunctioning element action, notify party stops to send block signal to comparing element;
If the Secondary Circuit of Potential Transformer of c protected location broken string causes the overcurrent element of protected location to start, then burn out detection module action, notify party stops to send block signal to comparing element.
Compared with prior art, the present invention has the following advantages:
1) adaptability.Can adapt to the power distribution network that contains many microgrids, support the operation with closed ring mode, the permission power distribution network works in isolated island, the two kinds of patterns that are incorporated into the power networks, and reduces as far as possible power failure range after fault.
2) opening.Utilize ripe, standardized GOOSE communication technology change of direction block signal, the interoperability between being easy to realize protecting, and it is lower to take communication bandwidth.
3) concertedness and rapidity.Can be according to abort situation adaptively changing locking direction, and with upstream and downstream protection coordinated.For distribution network line and busbar fault, microgrid internal bus fault, transformer station's low-voltage bus bar and power distribution network PCC etc. fault everywhere, all can excise fast.
4) autonomy and reliability.When the abnormal conditions such as generation PT broken string, breaker failure, also can reliably excise fault; When part even whole communication link fails, can independently increase action delay and rely on local information to make a strategic decision, prevent malfunction or tripping.
Description of drawings
Fig. 1 is GADIS protection philosophy schematic diagram;
Among the figure, the schematic diagram when (a) normally moving for power distribution network; (b) judge schematic diagram for fault direction; (c) be locking direction schematic diagram new after the fault.
Fig. 2 is initial locking direction tuning rule schematic diagram;
Fig. 3 is closed loop power distribution network topological diagram;
Each protection blocking direction changed schematic diagram when Fig. 4 was the F1 point failure.
Embodiment
The below elaborates to embodiments of the invention, and present embodiment is implemented under take technical solution of the present invention as prerequisite, provided detailed execution mode and concrete operating process, but protection scope of the present invention is not limited to following embodiment.
Embodiment
A kind of self adaptation cascade direction locking relay protecting method based on GOOSE; the method is considered the intelligent distribution network basic characteristics; adjust the locking direction according to the direction relations self adaptation between fault current and block signal; protection accurately cooperates and the purpose of selectivity isolated fault thereby reach, and consists of simple and practical intelligent distribution network protection system.Be provided with many cover protected location (Protective Relay in the described intelligent distribution network; PR); transmit block signal by the GOOSE agreement between described many cover protected locations; as shown in Figure 1, described every cover protected location (PR) comprises direction component, overcurrent element, direction comparator and two groups, four the empty terminals of GOOSE.Wherein, OUT1, OUT2 are the empty terminal of transmission, and IN1, IN2 are for receiving empty terminal, and first group of empty terminal IN1, OUT1 are responsible for the downstream locking, are respectively applied to receive from the upstream and send downstream block signal.Signal 1 represents locking, 0 representative cancellation locking; Second group of empty terminal IN2, OUT2 then are responsible for the locking updrift side.Can finish the GOOSE transmitting-receiving with an optical fiber or broadband power line communication physically.Direction component, direction comparator consist of PR block signal output module jointly with the empty terminal of transmission, overcurrent element consists of local circuit breaker trip signal output module jointly with the empty terminal of reception, and each module is all set up the logical equation of correlation function based on IEC 61131-3.
When fault occured, described relay protecting method specifically may further comprise the steps:
1) the initial locking direction tuning rule of basis is set the initial locking direction of protected location;
2) direction component Judging fault direction, then by the direction comparator itself and initial locking direction are compared, judge whether the two direction is identical, if, then execution in step 3), if not, gating IN2 then, and to OUT2 output block signal, this moment, the output signal direction was identical with initial locking direction;
3) direction comparator gating IN1, and to OUT1 output block signal, at this moment output signal direction and initially locking opposite direction;
4) receive empty terminal and judge whether to receive block signal, if, then locking, if not, then execution in step 5);
5) overcurrent element judges whether current fault current surpasses local overcurrent protection starting definite value, if then send trip signal.
For any protection, its trip condition is local overcurrent protection starting, and does not receive block signal, and criterion is as follows:
Trip＝NOT(LockingSignal)AND(I＞I_th)
In the formula, LockingSignal refers to that the block signal received, I_th are local overcurrent protection starting definite value, and peak load is adjusted by hiding.
Fig. 1 has set forth the basic principle of the GADIS scheme of inventing, and when power distribution network normally moved, the initial locking direction of protection was from the downstream directed upstream, i.e. PR3.OUT2 → PR2.IN2, PR2.OUT2 → PR1.IN2 are such as Fig. 1 (a).When the F1 place broke down, the overcurrent element of PR1, PR2, PR3 was all started, and the fault direction of PR1 differs from the locking direction, and the fault direction of PR2, PR3 is same as the locking direction, such as Fig. 1 (b).According to the adaptive direction locking rule of table 1, PR1 continues to send block signal to initial locking direction, and PR2, PR3 then send block signal to the opposite direction of initial locking direction, shown in Fig. 1 (c).At this moment, PR1, PR2 will send trip signal, and F1 place fault is successfully isolated.The upstream protection of PR1, PR3 and downstream protection thereof then are cascaded locking.
Table 1 is answered the direction locking rule from living
As shown in Figure 2, described initial locking direction tuning rule is specially:
The initial locking direction of line-breaker in A, the looped network (among the figure shown in the A) be (away from transformer station) directed upstream (close transformer station) from the downstream;
B, DG are incorporated into the power networks the initial locking direction of circuit breaker (among the figure shown in the B) for pointing to DG from circuit;
The initial locking direction of C, distribution substation circuit breaker (among the figure shown in the C) is for pointing to large electrical network.
During described intelligent distribution network abnormal, process in the following manner:
If behind a communication failure external area error occurs, the protection meeting is because can not receive the block signal malfunction.This programme utilizes the heartbeat message mechanism of GOOSE, can detect communication failure about 1s, and automatically increase t1 definite value (as increasing to 0.6s) to prevent from protecting malfunction, sends simultaneously alarm signal.After external fault was cut, this protection is instantaneous to be returned.
If b troubles inside the sample space but breaker failure, the action of breaker failure element, notify party is stopped paying out block signal to comparison module, like this, along the upper level protection of locking direction because of can not receive block signal with nearly reserve or far the reserve mode move and excise fault.
If Secondary Circuit of Potential Transformer broken string during the c troubles inside the sample space; the action of PT disconnection monitoring element; notify party is stopped paying out block signal to comparison module, like this, moves and excise fault because can not receive block signal with nearly reserve or reserve mode far away along the upper level protection of locking direction.
Fig. 3 is the closed loop intelligent distribution network, and wherein, distribution zone 1,3,5 contains DG, and distribution zone 1,3,5 contains DG and load, can be considered list/many facilities level microgrid; Only access load in the zone 2,4,6; And whole intelligent distribution network can be considered transformer station's level microgrid, possesses autonomy and islet operation ability, and distribution substation is points of common connection (PCC).Loop switch S is in closure state.The initial locking direction of each protection as shown by the arrows in Figure 3.
Have fault point, 6 place among Fig. 3, wherein, F1, F5 are distribution network line fault; F2～F4 is the busbar fault of microgrid, power distribution network, substation low-voltage side; F6 is power distribution network PCC place fault., present embodiment will be set forth the specific operation process of the inventive method as an example of fault point, above-mentioned 6 place example under power distribution network decoupled mode, the mode that is incorporated into the power networks and abnormal conditions.
(1) decoupled mode
A, line fault
When circuit breaks down between the 1-2 of zone (F1 point), each protects adaptively modifying locking direction, as shown in Figure 4.Because the IN mouth of PR1.2, PR2.1 all can not receive block signal, therefore all send trip signal and successful isolated fault.Power distribution network open loop operation this moment, but zone 1～6 continued power still.
B, busbar fault
During the interior busbar fault of microgrid (F2 point among Fig. 3), PR1.3 changes the locking direction, and PR1.4 remains unchanged.Because the two locking direction is opposing, all can not receive block signal, so all move in tripping operation and excision fault.Like this, fault microgrid (zone 1) enters the interruption maintenance state, but the power distribution network remainder still keeps operation with closed ring.
And if fault occurs in distribution bus (F3 point among Fig. 3), according to the locking rule, PR5.2 changes the locking direction, and PR5.1 and PR5.3 remain unchanged, so the three is all because moving without block signal.At this moment, because PR5.4 still can not cut DG by the stream signal locking by mistake, therefore the microgrid in zone 5 runs on island state, and power distribution network open loop operation.
C, cyclization switch fault
When cyclization switch S place breaks down (F5 point among Fig. 3), PR3.2 and PR6.2 are according to rule action and excise fault.Power distribution network open loop operation this moment.
(2) mode that is incorporated into the power networks
A, power distribution network internal fault
The closed loop power distribution network itself has the bi-directional current characteristic, therefore compares with island mode, and the pattern that is incorporated into the power networks is only different on fault current levels, can not impact the protection the result of the action.Therefore for distribution internal fault (F1～F5 point), the mode of operation during by analysis as can be known with isolated island is identical.
B, transformer station's low-voltage bus bar fault
During distribution substation low-voltage side busbar fault (F4 point among Fig. 3), protection PR1 detects fault current with PR2 and initially the locking direction is identical, therefore changes simultaneously the locking direction.Because the two all can not receive the other side's block signal, PR1, PR2 move and in tripping operation fault bus are isolated, and this moment, whole power distribution network entered the islet operation state, and the open loop operation.
C, power distribution network points of common connection fault
When fault occurs in substation low-voltage side (F6 point among Fig. 3), fault current and PR
LVInitial locking in the same way, PR
LVOppositely send block signal.Because PR
MVWith PR
LVThe locking direction opposing, protection action excision fault, this moment, whole power distribution network entered the islet operation state, but still kept operation with closed ring.
(3) abnormal conditions (take the F1 point failure as example)
A, PT broken string
If PR1.2 causes direction component to start because of the PT broken string, then PR1.2 can't be to PR1.1, PR1.3 sending direction block signal.Like this, PR1.1, PR1.3 move and excise fault because can not receive block signal.So fault still can be excised fast when PT breaks, but cause the microgrid in zone 1 to enter island state.
B, breaker failure
If PR1.2 breaker failure during the F1 point failure, then malfunctioning element action, notify party stops to send block signal to PR1.1, PR1.3 to comparison module, so PR1.1, PR1.3 action and excision fault.Similarly, this causes the microgrid in zone 1 to enter island state.
C, communication failure
Suppose the GOOSE communication disruption between PR2.2, the PR3.1, then PR3.1 initiatively increases action delay t1 to 0.6s, sends simultaneously alarm signal and notifies the operations staff to overhaul.If after this F1 point breaks down, although then PR3.1 can not receive the block signal of PR2.2, it can malfunction.After the excision of F1 point failure, the PR3.1 protection is instantaneous returning immediately.
Claims (4)
1. self adaptation cascade direction locking relay protecting method based on GOOSE, it is characterized in that, the method utilizes the realization of self adaptation cascade direction locking strategy to contain the relaying protection of the intelligent distribution network of distributed power source access, be provided with many cover protected locations in the described intelligent distribution network, transmit block signal by the GOOSE agreement between described many cover protected locations, described protected location comprises direction component, overcurrent element, direction comparator, sends empty terminal and the empty terminal of reception; Described relay protecting method specifically may further comprise the steps:
1) the initial locking direction tuning rule of basis is set the initial locking direction of each protected location;
2) direction component is differentiated current fault current direction, and the direction comparator compares itself and initial locking direction, judges whether the two direction is identical, if, then execution in step 3), if not, then by sending empty terminal output and the initial equidirectional block signal of locking direction;
3) the direction comparator is by sending empty terminal output and the initial reciprocal block signal of locking direction;
4) receive empty terminal and judge whether to receive block signal, if, then locking, if not, then execution in step 5);
5) overcurrent element judges whether current fault current surpasses local overcurrent protection starting definite value, if then send trip signal.
2. a kind of self adaptation cascade direction locking relay protecting method based on GOOSE according to claim 1 is characterized in that, the empty terminal of described transmission and the empty terminal of reception are provided with two groups, sends respectively block signal to the circuit upstream and downstream.
3. a kind of self adaptation cascade direction locking relay protecting method based on GOOSE according to claim 1 is characterized in that described initial locking direction tuning rule is specially:
The initial locking direction of the protected location of line-breaker is from the downstream directed upstream in A, the looped network;
B, DG are incorporated into the power networks the initial locking direction of protected location of circuit breaker for point to DG from circuit;
The initial locking direction of the protected location of C, distribution substation circuit breaker is for pointing to large electrical network.
4. a kind of self adaptation cascade direction locking relay protecting method based on GOOSE according to claim 1 is characterized in that, during described intelligent distribution network abnormal, processes in the following manner;
A, protected location utilize the heartbeat message mechanism of GOOSE to carry out channel selftest, in case detect communication failure, then independently increase the outlet time-delay definite value of trip signal, send simultaneously alarm signal, after detecting communication normally, the instantaneous outlet time-delay definite value with trip signal of protected location is returned original value;
If the b breaker failure, then notify party stops to send block signal to comparing element;
If the overcurrent element of c protected location can't start, then notify party stops to send block signal to comparing element.
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| CN109245059B (en) * | 2018-08-31 | 2020-01-10 | 南京南瑞继保电气有限公司 | Micro-grid feeder protection method and device |
| CN109245059A (en) * | 2018-08-31 | 2019-01-18 | 南京南瑞继保电气有限公司 | A kind of micro-capacitance sensor protection for feed line method and device |
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| CN110323724A (en) * | 2019-06-25 | 2019-10-11 | 国网浙江省电力有限公司金华供电公司 | A kind of the ring distribution system protective relaying device and control method of automatic discriminating direction |
| CN110323724B (en) * | 2019-06-25 | 2022-04-19 | 国网浙江省电力有限公司金华供电公司 | Annular power distribution network relay protection device capable of automatically judging direction and control method |
| CN110350499A (en) * | 2019-07-24 | 2019-10-18 | 齐鲁工业大学 | Multiterminal permissive type direction pilot protection method and device for transmission and distribution networks |
| CN110350499B (en) * | 2019-07-24 | 2022-04-19 | 齐鲁工业大学 | Multi-terminal allowable directional pilot protection method and device for power transmission and distribution network |
| CN112582987A (en) * | 2020-11-26 | 2021-03-30 | 长园深瑞继保自动化有限公司 | Intelligent distributed feeder fault judgment and positioning method for distribution network |
| CN112582987B (en) * | 2020-11-26 | 2022-07-26 | 长园深瑞继保自动化有限公司 | Intelligent distributed feeder fault judgment and positioning method for distribution network |
| CN113964800A (en) * | 2021-09-13 | 2022-01-21 | 南京国电南自电网自动化有限公司 | Wireless differential protection method under different operation and fault throttling modes |
| CN113964800B (en) * | 2021-09-13 | 2024-02-13 | 南京国电南自电网自动化有限公司 | Wireless differential protection method in operation and fault throttling mode |
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