CN104466923A - Power distribution network protection circuit and system connected into microgrid - Google Patents
Power distribution network protection circuit and system connected into microgrid Download PDFInfo
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- CN104466923A CN104466923A CN201410678092.9A CN201410678092A CN104466923A CN 104466923 A CN104466923 A CN 104466923A CN 201410678092 A CN201410678092 A CN 201410678092A CN 104466923 A CN104466923 A CN 104466923A
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Abstract
The invention discloses a power distribution network protection circuit and system connected into a microgrid. The power distribution network protection circuit connected into the microgrid comprises a first branch circuit and a second branch circuit; the first end of the first branch circuit is connected with the system side of a power distribution network, and the second end of the first branch circuit is connected with a distributed type power source, wherein a first bus is connected to the first branch circuit, a first open circuit protector is arranged on the first side of the first bus on the first branch circuit, and a second open circuit protector is arranged on the second side of the first bus on the first branch circuit; the first end of the second branch circuit is connected with the second end of the first branch circuit, the second end of the second branch circuit is used for outputting electric energy of a power distribution network system and/or the distributed type power source, a third open circuit protector is further arranged on the second branch circuit and connected with the second open circuit protector, and pilot protection devices are allocated to the third open circuit protector and the first open circuit protector. The problem that in the prior art, when the microgrid breaks down, the power distribution network connected into the microgrid cannot cut off the faulted branch circuits in time is solved.
Description
Technical field
The present invention relates to micro-capacitance sensor field, in particular to a kind of the distribution protection circuit and the system that access microgrid.
Background technology
First micro-capacitance sensor (microgrid) concept is proposed by U.S. CE RTS (The Consortium for Electric ReliabilityTechnology Solutions); that is collected by distributed power source, energy storage device, energy converter, associated loadings and monitoring, protective device is small-sizedly transported to electric system; electric energy and heat energy can be supplied simultaneously; both can be incorporated into the power networks with power distribution network; also can independent operating, be one can teaching display stand control, the autonomous system of protect and manage.Micro-capacitance sensor can referred to as microgrid.
At present, power distribution network is the electric power system of single supply, radial structure, and traditional distribution protection and automatics design for unidirectional trend.The access of multiple distributed power source and energy storage device in microgrid, change the feature of distribution system fault up hill and dale, change the original topological structure of power distribution network and direction of tide, after making fault, the change of electric parameters becomes very complicated, therefore, when a failure occurs, need to cut off the branch road broken down in time, avoid the fault effects of this branch road to power to power distribution network.
Inventor finds, existing distribution protection circuit can, because the effect of microgrid, cause its sensitivity lower, cannot the branch road of disengagement failure in time.
Cannot the problem of the branch road of disengagement failure in time when microgrid breaks down for the power distribution network accessing microgrid in prior art, at present effective solution is not yet proposed.
Summary of the invention
Main purpose of the present invention is to provide a kind of the distribution protection circuit and the system that access microgrid, cannot the problem of the branch road of disengagement failure in time when microgrid breaks down to solve in prior art the power distribution network accessing microgrid.
To achieve these goals, according to an aspect of the present invention, a kind of distribution protection circuit accessing microgrid is provided.Distribution protection circuit according to the present invention comprises: the first branch road, first end is connected with distribution network system side, second end is connected with distributed power source, wherein, described first branch road is connected with the first bus, on described first branch road, the first side of described first bus is provided with the first breaker protector, and on described first branch road, the second side of described first bus is provided with the second breaker protector; And second branch road; first end is connected with the second end of described first branch road; wherein; second end of described second branch road is for exporting the electric energy of described distribution network system and/or described distributed power source; wherein; described second branch road is also provided with the 3rd breaker protector, and described 3rd breaker protector is connected with described second breaker protector, at described 3rd breaker protector place and described first breaker protector place configuration pilot protection device.
Further, the first time delay over-current protective device is configured with respectively at described first breaker protector place and described second breaker protector place.
Further, described first time delay over-current protective device is the time delay over-current protective device with direction component.
Further, weak feedback protective device is also configured with at described 3rd breaker protector place.
Further, described first breaker protector place is provided with the first reclosing, described 3rd breaker protector place is provided with the second reclosing.
Further, described distributed power source is directly connected with the second end of described first branch road, or described distributed power source is connected by second end of the second bus with described first branch road.
Further, described second branch road is connected with triple bus-bar, on described second branch road, the first side of described triple bus-bar is provided with the 4th breaker protector, and on described second branch road, the second side of described triple bus-bar is provided with the 5th breaker protector.
Further, described 4th breaker protector place and described 5th breaker protector place are configured with the second time delay over-current protective device respectively, and described second time delay over-current protective device is the time delay over-current protective device with direction component.
To achieve these goals, according to an aspect of the present invention, a kind of distribution protection system accessing microgrid is provided.Distribution protection system according to the present invention comprises: distribution network system; Distributed power source, accesses in described distribution network system; The distribution protection circuit of above-mentioned access microgrid, is arranged on the connection line of described distributed power source and described distribution network system.
According to the embodiment of the present invention; the first end of the first branch road is connected with distribution network system side; second end is connected with distributed power source; wherein; first branch road is connected with the first bus; first side of the first bus is provided with the first breaker protector on the first leg, and the second side of the first bus is provided with the second breaker protector on the first leg.The first end of the second branch road is connected with the second end of the first branch road, namely the first branch road and the second branch road direct-connected.Wherein, second end of the second branch road is used for the electric energy of output distribution net system and/or distributed power source; wherein; second branch road is also provided with the 3rd breaker protector; 3rd breaker protector is connected with the second breaker protector; at the 3rd breaker protector place and the first breaker protector place configuration pilot protection device; thus solve in prior art the power distribution network accessing microgrid cannot the problem of the branch road of disengagement failure in time when microgrid breaks down, reaching when microgrid breaks down cannot the problem of the branch road of disengagement failure in time.
Accompanying drawing explanation
The accompanying drawing forming a application's part is used to provide a further understanding of the present invention, and schematic description and description of the present invention, for explaining the present invention, does not form inappropriate limitation of the present invention.In the accompanying drawings:
Fig. 1 is the schematic diagram of the distribution protection circuit of access microgrid according to the embodiment of the present invention;
Fig. 2 is the schematic diagram of the distribution protection circuit preferably accessing microgrid according to the embodiment of the present invention; And
Fig. 3 is the schematic diagram that another preferably accesses the distribution protection circuit of microgrid according to the embodiment of the present invention.
Embodiment
It should be noted that, when not conflicting, the embodiment in the application and the feature in embodiment can combine mutually.Below with reference to the accompanying drawings and describe the present invention in detail in conjunction with the embodiments.
The present invention program is understood better in order to make those skilled in the art person, below in conjunction with the accompanying drawing in the embodiment of the present invention, technical scheme in the embodiment of the present invention is clearly and completely described, obviously, described embodiment is only the embodiment of a part of the present invention, instead of whole embodiments.Based on the embodiment in the present invention, those of ordinary skill in the art, not making the every other embodiment obtained under creative work prerequisite, should belong to the scope of protection of the invention.
It should be noted that, term " first ", " second " etc. in specification of the present invention and claims and above-mentioned accompanying drawing are for distinguishing similar object, and need not be used for describing specific order or precedence.Should be appreciated that the data used like this can be exchanged, in the appropriate case so that embodiments of the invention described herein.In addition, term " comprises " and " having " and their any distortion, intention is to cover not exclusive comprising, such as, contain those components and parts that the system of a series of components and parts, product or equipment are not necessarily limited to clearly list, but can comprise clearly do not list or for intrinsic other components and parts of these systems, product or equipment.
Embodiments provide a kind of distribution protection circuit accessing microgrid.This protective circuit comprises: the first branch road and the second branch road.
Fig. 1 is the schematic diagram of the distribution protection circuit of access microgrid according to the embodiment of the present invention.As shown in Figure 1, power distribution network is connected with feeder line 1 and feeder line 2, wherein, feeder line 2 is connected with distributed power source (DG).Feeder line 2 is divided into 2 districts by the position according to DG access: first area is the upstream region of DG, is made up of circuit AB and BC; Second area is the downstream area of DG, is made up of circuit CD and DE.
First branch road is in first area, and the second branch road is in second area.The first end of the first branch road is connected with distribution network system side; second end is connected with distributed power source DG; wherein; first branch road is connected with the first bus B; first side of the first bus B is provided with the first breaker protector a on the first leg, and second side of the first bus B is provided with the second breaker protector b on the first leg.The first end of the second branch road is connected with the second end of the first branch road, namely the first branch road and the second branch road direct-connected.Wherein, second end of the second branch road is used for the electric energy of output distribution net system and/or distributed power source DG; wherein; second branch road is also provided with the 3rd breaker protector c; 3rd breaker protector c is connected with the second breaker protector b, at the 3rd breaker protector c place and the first breaker protector a place configuration pilot protection device (not shown).
Increase by the 3rd breaker protector c on the first leg; and at the 3rd breaker protector c place and the first breaker protector a place configuration pilot protection device; this pilot protection device is when line failure, makes a kind of protective device of fast trip while of the switch of both sides.When breaking down in first area, this pilot protection device instantaneous operation protects whole region, is cut off in this region from power distribution network, thus cuts off this branch road broken down.
According to the embodiment of the present invention; the first end of the first branch road is adopted to be connected with distribution network system side; second end is connected with distributed power source; wherein; first branch road is connected with the first bus; first side of the first bus is provided with the first breaker protector on the first leg, and the second side of the first bus is provided with the second breaker protector on the first leg.The first end of the second branch road is connected with the second end of the first branch road, namely the first branch road and the second branch road direct-connected.Wherein, second end of the second branch road is used for the electric energy of output distribution net system and/or distributed power source; wherein; second branch road is also provided with the 3rd breaker protector; 3rd breaker protector is connected with the second breaker protector; at the 3rd breaker protector place and the first breaker protector place configuration pilot protection device; thus solve in prior art the power distribution network accessing microgrid cannot the problem of the branch road of disengagement failure in time when microgrid breaks down, reaching when microgrid breaks down cannot the problem of the branch road of disengagement failure in time.
Preferably, the first time delay over-current protective device is configured with respectively at the first breaker protector a place and the second breaker protector b place.Further, the first time delay over-current protective device is the time delay over-current protective device with direction component.
Wherein, time delay over-current protection refers to the Action Selection in order to realize overcurrent protection, and the operate time of each protection generally adjusts by ladder principle.The i.e. operate time of adjacent protection, increase step by step to power supply direction from load, and the operate time of often overlapping protection is invariable, has nothing to do with short circuit current.
Direction component can be sense of current element; sense of current element have on the circuit both sides switch of power supply, therefore, no matter when positive direction or reverse direction failure owing to can be arranged on circuit both sides; protection installation place all has electric current to flow through, thus avoids occurring overcurrent protection misoperation.
Preferably, weak feedback protective device is also configured with at the 3rd breaker protector c place.
Consider when breaking down in first area; if now the power output of DG is less or out of service; the direction component sensitivity of the directional pilot protection side of the 3rd breaker protector c may be caused not enough; akinesia; so also should configure weak feedback protection at the 3rd breaker protector c place; to ensure how the power output of no matter DG changes, and directional pilot protection can reliably protect whole first area.
Preferably, the first breaker protector place is provided with the first reclosing, the 3rd breaker protector place is provided with the second reclosing.
Also be provided with reclosing function at the first breaker protector a and the 3rd breaker protector c place, after the first breaker protector a trips, the reclosing at startup first breaker protector a place restored electricity again.Because now the 3rd breaker protector c has disconnected and do not overlapped, therefore the first breaker protector a only need configure general reclosing, does not require inspection synchronization function.The reclosing function of the 3rd breaker protector c is only just started by the first breaker protector a when the first breaker protector a is judged to transient fault, and certainly because now DG still exists, therefore reclosing here needs to examine the same period.If the fault that first area occurs is instantaneity, then just restore electricity after reclosing action; If fault is permanent, then fault is excised selectively by overcurrent second breaker protector b or the first breaker protector a.
Preferably, distributed power source DG is directly connected with the second end of the first branch road, or distributed power source DG is connected with the second end of the first branch road by the second bus.
As shown in Figure 1, in the circuit, distributed power source DG is connected with the second end of the first branch road by the second bus B, and shown in Fig. 2, distributed power source DG is directly connected on feeder line 2.
As shown in Figure 1, the second branch road is connected with triple bus-bar C, on the second branch road, first side of triple bus-bar C is provided with the 4th breaker protector d, and on the second branch road, second side of triple bus-bar C is provided with the 5th breaker protector e.
The relaying configuration of first area is similar to the reclosing preacceleration mode be made up of current quick-breaking and overcurrent protection conventional in distribution network system, just instead of current quick with the directional pilot protection of same instantaneous operation here.Second area is a single ended power supply network, configures time delay over-current protection at the 4th breaker protector d place and the 5th breaker protector e place respectively, and takes reclosing preacceleration or rear accelerated mode according to actual conditions.For the feeder line 1 not accessing DG, still the current protection of reclosing preacceleration traditionally or rear accelerated mode is configured.
Preferably, the 4th breaker protector d place and the 5th breaker protector e place are configured with the second time delay over-current protective device respectively, and the second time delay over-current protective device is the time delay over-current protective device with direction component.
After above-mentioned relaying configuration is carried out to feeder line 2; as the above analysis; cooperation between time delay over-current protection when the access of DG will not have DG to access to feeder line 2 originally has an impact; the overcurrent protection of whole piece feeder line can retain original definite value and the matching relationship on the time limit completely, does not need to re-start to adjust.
For the situation having multiple DG to access; its principle is with the situation of an above-mentioned middle access DG; such as; as shown in Figure 3; when feeder line 2 is connected to 2 DG; feeder line 2 is divided into 3 regions, give first area and second area configuration directional pilot protection respectively, the specified time overcurrent protection in first area and second area also installs direction component additional.
As shown in Figure 2, when a feeder line having at least a DG be not connected on bus place, DG is connected on the K point between bus B and C, now needs to install circuit breaker the 3rd breaker protector c and the 4th breaker protector d respectively additional in K point both sides.So inevitably needing the setting value order again carrying out overcurrent protection, in order to fault can be excised quickly when breaking down, to reduce the destruction of short circuit to DG, time delay over-current can be replaced to protect with inverse time over-current protection.If the access point K of DG is used as new bus, so now will exist different from the embodiment shown in above-mentioned Fig. 1 to the configuration of each circuit breaker place protection.
To the setting principle of inverse-time overcurrent protection be: starting current is still by avoiding maximum load current to adjust; Simultaneously; in order to ensure the selectivity between protection; require under maximum operational mode; during the short circuit of next stage line outlet; upper level protection protects a high time step Δ t than next stage on operation time limit, can ensure that the operation time limit protected under other operational modes all can meet selectivity requirement like this.According to this principle, setting value order is carried out to the inverse time over-current protection of feeder line in Fig. 22.
First setting value order is carried out to the inverse time protection at the 5th breaker protector e place in second area and the 4th breaker protector d place, under maximum operational mode, namely DG is with maximum capability operation, and when the outlet of the 5th breaker protector e is short-circuited, the 5th breaker protector e can adjust as instantaneous operation; For ensureing selectivity, now the operation time limit of the 4th breaker protector d should exceed a time step Δ t than the 5th breaker protector e.After adjusting like this, when DG power output diminishes or be out of service, the 5th breaker protector e and the 4th breaker protector d still can ensure reliable fit.
For the inverse-time overcurrent protection at the second breaker protector b place in first area; consider when DG does not access; during the 4th breaker protector d terminal short-circuit; the operation time limit of the second breaker protector b should be adjusted as exceeding a time step Δ t than the 4th breaker protector d; so just can ensure that the second breaker protector b and the 4th breaker protector d still can ensure selectivity after DG access.For the inverse time protection at the first breaker protector a place, carry out coordinating on the time limit with the second breaker protector b by the same way.After having multiple DG to access, the configuration of protection and setting method all fours.
When first area, any point breaks down, and the direction component of directional pilot protection both sides is all judged as positive direction, therefore thinks and there occurs troubles inside the sample space, action message is disconnected the first breaker protector a and the 3rd breaker protector c.First breaker protector a place circuit breaker overlaps fast subsequently, if transient fault, after overlapping, fault will disappear, and then the 3rd breaker protector c will overlap, thus recover the power supply to whole piece feeder line; If permanent fault, fault is excised in the inverse-time overcurrent protection selectivity action by the second breaker protector b and the first breaker protector a place.If the power output of DG diminishes or DG is out of service, by causing the direction component sensitivity decrease at the 3rd breaker protector c place, cannot start.But, owing to having installed weak feedback protection at the 3rd breaker protector c place, can ensure that light current source also can action message.
When second area and circuit KC and CD break down, the action behavior of protection is different from the difference of reclosing mode taked.In reclosing preacceleration mode, now will at the 4th breaker protector d place configuration current quick for the protection of whole second area.When breaking down in second area, first the current quick instantaneous operation at the 4th breaker protector d place, overlaps subsequently.If transient fault, after overlapping, fault will disappear; If permanent fault, then excise fault by the inverse-time overcurrent protection selectivity action at the 5th breaker protector e or the 4th breaker protector d place.Because the inverse time protection in DG downstream coordinates by the maximum output of DG, therefore when the power output of DG diminishes or out of service time, after DG downstream fault, they still can action selectively, can not by the impact of DG power output change.
When adjacent feeders 1 breaks down, owing to all having added direction component to the inverse-time overcurrent protection of first area, what flow through the second breaker protector b place and the first breaker protector a place has been reciprocal electric current, and therefore they can not misoperation.
Protection act likely can form isolated island later, can carry out the division of isolated island to this, to maintain the balance of isolated island internal power and the stable of electric voltage frequency.
The embodiment of the present invention additionally provides a kind of distribution protection system accessing microgrid.This protection system comprises: distribution network system; Distributed power source, accesses in described distribution network system; The distribution protection circuit of the access microgrid that the embodiment of the present invention provides, is arranged on the connection line of described distributed power source and described distribution network system.
Particularly, the detailed description for this distribution protection system see the above-mentioned description to distribution protection circuit, can not repeat here.
The foregoing is only the preferred embodiments of the present invention, be not limited to the present invention, for a person skilled in the art, the present invention can have various modifications and variations.Within the spirit and principles in the present invention all, any amendment done, equivalent replacement, improvement etc., all should be included within protection scope of the present invention.
Claims (9)
1. access a distribution protection circuit for microgrid, it is characterized in that, comprising:
First branch road, first end is connected with distribution network system side, second end is connected with distributed power source, wherein, described first branch road is connected with the first bus, on described first branch road, the first side of described first bus is provided with the first breaker protector, and on described first branch road, the second side of described first bus is provided with the second breaker protector; And
Second branch road; first end is connected with the second end of described first branch road; wherein; second end of described second branch road is for exporting the electric energy of described distribution network system and/or described distributed power source; wherein; described second branch road is also provided with the 3rd breaker protector, and described 3rd breaker protector is connected with described second breaker protector, at described 3rd breaker protector place and described first breaker protector place configuration pilot protection device.
2. the distribution protection circuit of access microgrid according to claim 1, is characterized in that,
The first time delay over-current protective device is configured with respectively at described first breaker protector place and described second breaker protector place.
3. the distribution protection circuit of access microgrid according to claim 2, is characterized in that, described first time delay over-current protective device is the time delay over-current protective device with direction component.
4. the distribution protection circuit of access microgrid according to claim 1, is characterized in that, is also configured with weak feedback protective device at described 3rd breaker protector place.
5. the distribution protection circuit of access microgrid according to claim 1, is characterized in that, described first breaker protector place is provided with the first reclosing, and described 3rd breaker protector place is provided with the second reclosing.
6. the distribution protection circuit of access microgrid according to claim 1; it is characterized in that; described distributed power source is directly connected with the second end of described first branch road, or described distributed power source is connected by second end of the second bus with described first branch road.
7. the distribution protection circuit of access microgrid according to claim 1, is characterized in that,
Described second branch road is connected with triple bus-bar, and on described second branch road, the first side of described triple bus-bar is provided with the 4th breaker protector, and on described second branch road, the second side of described triple bus-bar is provided with the 5th breaker protector.
8. the distribution protection circuit of access microgrid according to claim 7; it is characterized in that; described 4th breaker protector place and described 5th breaker protector place are configured with the second time delay over-current protective device respectively, and described second time delay over-current protective device is the time delay over-current protective device with direction component.
9. access a distribution protection system for microgrid, it is characterized in that, comprising:
Distribution network system;
Distributed power source, accesses in described distribution network system;
The distribution protection circuit of the access microgrid according to any one of claim 1 to 8, is arranged on the connection line of described distributed power source and described distribution network system.
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| CN201410678092.9A CN104466923A (en) | 2014-11-21 | 2014-11-21 | Power distribution network protection circuit and system connected into microgrid |
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| CN201410678092.9A CN104466923A (en) | 2014-11-21 | 2014-11-21 | Power distribution network protection circuit and system connected into microgrid |
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Application publication date: 20150325 |