CN205141669U - Distribution network cascade compensation circuit and system - Google Patents
Distribution network cascade compensation circuit and system Download PDFInfo
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- CN205141669U CN205141669U CN201520962955.5U CN201520962955U CN205141669U CN 205141669 U CN205141669 U CN 205141669U CN 201520962955 U CN201520962955 U CN 201520962955U CN 205141669 U CN205141669 U CN 205141669U
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Abstract
The embodiment of the utility model discloses distribution network cascade compensation circuit and system, the circuit includes main line, power consumption circuit, capacitor bank and control circuit, wherein, the power consumption circuit with the main line is connected, capacitor bank with the power consumption circuit is parallelly connected mutually, control circuit respectively with the main line with capacitor bank is connected, capacitor bank includes: at least one condenser and at least one circuit breaker, and, capacitor bank includes two at least parallelly connected branch roads, is first branch road and second branch road respectively, wherein, first is equipped with first circuit breaker and first condenser on the road in proper order, the second props up and is equipped with the second capacitor on the road. Condenser through each branch road among the control capacitor bank drops into and the disconnection, and then realizes the input and the disconnection of a part of the capacitance ware, has increased the electric capacity gradient of different brackets in the circuit for circuit voltage control is more level and smooth, and cascade compensation is carried out to the distribution network to the convenience.
Description
Technical field
The utility model relates to technical field of relay protection, particularly relates to a kind of power distribution network series compensation circuit and system.
Background technology
In power distribution network, the aspect such as it is the Power System Interconnection of 220kV and above that series compensation is applied the most widely, the long distance of Hydro-Thermal Systems is sent, contact between reinforcing mat.The general principle of series compensation is, connect on the line capacitive apparatus, such as a capacitor, make the capacitive reactance of this equipment and the reaction component of circuit offset, thus shorten the electrical distance between receiving end and sending end, to increase the transmission capacity of circuit.
But more than just compensate for the high-tension line of 220kV, installing series compensation device main purpose additional for low-voltage circuit is adjusting circuit voltage.When after circuit series capacitor, the equivalent reactance X of circuit will reduce, and even become negative value, therefore need the voltage of too high load side, and be controlled, in rational scope, to complete voltage management task.On the other hand, in the power distribution network of below 220KV, voltage on circuit can change along with the change of load in a day, so the scope of its qualified voltage also can fluctuate, for ensureing voltage safe operation on power distribution network center line, need to control according to the capacity of change in voltage to capacitor of circuit.
In traditional capacitor series compensation device; as shown in Figure 2; the Capacitor banks of low pressure string bowl spares is controlled by isolating switch; can only drop into simultaneously or excise simultaneously, and lack corresponding regulating power, therefore; distribution requirement can not be met; in addition, the capacitor group switching of larger capacity also can produce larger ground charging stream, and then causes proterctive equipment malfunction.
Utility model content
The utility model embodiments provides a kind of power distribution network series compensation circuit and system, to solve the problems of the technologies described above.
In order to solve the problems of the technologies described above, the utility model embodiment discloses following technical scheme:
A kind of power distribution network series compensation circuit, comprise main line, power circuit, Capacitor banks and control circuit, wherein, described power circuit is connected with described main line, described Capacitor banks and described power circuit are in parallel, and described control circuit is connected with described Capacitor banks with described main line respectively;
Described Capacitor banks comprises: at least one capacitor and at least one circuit breaker, and, described Capacitor banks comprises at least two branch roads in parallel, be respectively the first branch road and the second branch road, wherein, described first branch road is provided with successively the first circuit breaker and the first capacitor, described second branch road is provided with the second capacitor.
Preferably, described Capacitor banks also comprises the 3rd branch road, described 3rd branch road respectively with described first branch road and described second branch circuit parallel connection, described 3rd branch road is provided with the second circuit breaker.
Preferably, described Capacitor banks also comprises input and output, wherein, on described first branch road, one end of described first circuit breaker is connected with described input, the other end of described first circuit breaker is connected with one end of described first capacitor, and the other end of described first capacitor is connected with described output; On described second branch road, the two ends of described second capacitor are connected with output with described input respectively.
Preferably, on described 3rd branch road, the two ends of described second circuit breaker are connected with output with described input respectively.
A kind of power distribution network series compensation system; described system comprises: substation bus bar, distribution transformer, proterctive equipment, Capacitor banks and controller; described substation bus bar is provided with distribution transformer, proterctive equipment and controller; described Capacitor banks and described proterctive equipment are connected in parallel; described controller is connected with described Capacitor banks; wherein
Described Capacitor banks comprises at least one capacitor and at least one circuit breaker, and, described Capacitor banks comprises at least two branch roads in parallel, be respectively the first branch road and the second branch road, wherein, described first branch road is provided with successively the first circuit breaker and the first capacitor, described second branch road is provided with the second capacitor.
Preferably, described Capacitor banks also comprises the 3rd branch road, described 3rd branch road respectively with described first branch road and described second branch circuit parallel connection, described 3rd branch road is provided with the second circuit breaker.
From above technical scheme, a kind of power distribution network series compensation circuit that the utility model embodiment provides and system, because Capacitor banks comprises multiple branch road, dropped into by the capacitor of each branch road in control capacitor group and disconnect, and then realize input and the disconnection of partial capacitor, avoiding existing Capacitor banks can only all drop into and disconnect, and adds the capacitance gradient of different brackets in circuit, line voltage distribution is regulated more level and smooth, conveniently series compensation is carried out to power distribution network.In addition, control capacitor part drops into and cuts off can also avoid the whole switching of Capacitor banks to produce larger ground charging stream, causes proterctive equipment malfunction, and can avoid choosing compared with large capacitor make capacitor repeatedly switching shorten the useful life of equipment.
A kind of power distribution network series compensation circuit that the utility model embodiment provides, by arranging the 3rd branch road on Capacitor banks, achieve the capacitance of Capacitor banks three gears, further increase adjustable capacitance, make line voltage distribution adjustable extent wider, further increase the smoothness that line voltage distribution regulates.
Accompanying drawing explanation
In order to be illustrated more clearly in the utility model embodiment or technical scheme of the prior art, be briefly described to the accompanying drawing used required in embodiment or description of the prior art below, apparently, for those of ordinary skills, under the prerequisite not paying creative work, other accompanying drawing can also be obtained according to these accompanying drawings.
The structural representation of a kind of power distribution network series compensation circuit that Fig. 1 provides for the utility model embodiment;
Fig. 2 is the structural representation of traditional capacitor series compensation system;
The structural representation of the another kind of power distribution network series compensation circuit that Fig. 3 provides for the utility model embodiment;
The structural representation of a kind of power distribution network series compensation system that Fig. 4 provides for the utility model embodiment;
The flow chart of a kind of power distribution network serial connection compensation control method that Fig. 5 provides for the utility model embodiment.
Embodiment
Technical scheme in the utility model is understood better in order to make those skilled in the art person, below in conjunction with the accompanying drawing in the utility model embodiment, technical scheme in the utility model embodiment is clearly and completely described, obviously, described embodiment is only the utility model part embodiment, instead of whole embodiments.Based on the embodiment in the utility model, those of ordinary skill in the art are not making the every other embodiment obtained under creative work prerequisite, all should belong to the scope of the utility model protection.
The terminal connection method provided the utility model embodiment below in conjunction with Fig. 1 to Fig. 4 and terminal are specifically described.
See Fig. 1, it is a kind of power distribution network series compensation circuit that the utility model embodiment provides, comprise main line 10, power circuit 20, Capacitor banks 30 and control circuit 40, wherein, described power circuit 20 is connected with described main line 10, described in be connected comprise power circuit series connection or be connected in parallel on main line; Described Capacitor banks 30 is in parallel with described power circuit 20, and described control circuit 40 is connected with described Capacitor banks 30 with described main line 10 respectively.
Described Capacitor banks 30 comprises: at least one capacitor C and at least one circuit breaker BBR, and, as shown in Figure 1, this Capacitor banks 30 comprises at least two branch roads in parallel, be respectively the first branch road and the second branch road, wherein, described first branch road is provided with successively the first circuit breaker BBR1 and the first capacitor C1, described second branch road is provided with the second capacitor C2.
Wherein, circuit breaker BBR1 realizes the switching of described first capacitor C1 by opening and closing, and make when circuit breaker BBR1 is closed, the first capacitor C1 devotes oneself to work; When circuit breaker BBR1 disconnects, the first capacitor C1 excises from circuit.In a specific embodiment, as shown in Figure 3, for concrete series compensation circuit diagram, the front end of main line is mains side, and end is load side, and the circuit be connected with main line comprises incoming line cabinet circuit, high line cabinet circuit and bypass cabinet circuit etc.Comprise power consumption equipment and the first circuit breaker BBR1 in incoming line cabinet, be also once in series with impedance devices T20 and capacitor C32 with this first circuit breaker BBRI, and capacitor C32 and capacitor C31 is connected in parallel.Bypass cabinet comprises the second circuit breaker BBR2, and this second circuit breaker BBR2 is used for by-pass capacitor C32 and capacitor C31; Comprise control switch DS3 at high line cabinet, this control switch DS3 opens for the circuit breaker controlled in incoming line cabinet and bypass cabinet or closes, and then realizes the switching of different capacitors.
Wherein, the circuit breaker opening and closing that described controller 40 or control switch DS3 control in described Capacitor banks 30 is prior art, or belongs to control principle conventional in relaying protection and method, therefore, does not set forth at this concrete process controlled.
In a preferred embodiment, described Capacitor banks 30 also comprises the 3rd branch road, described 3rd branch road respectively with described first branch road and described second branch circuit parallel connection, described 3rd branch road is provided with the second circuit breaker BBR2.
Wherein, described Capacitor banks 30 also comprises input M and output N, as shown in Figure 1, the inner concrete circuit connecting relation of this Capacitor banks 30 is, on described first branch road, one end of first circuit breaker BBR1 is connected with described input M, and the other end of the first circuit breaker BBR1 is connected with one end of the first capacitor C1, and the other end of this first capacitor C1 is connected with output N; On described second branch road, the two ends of the second capacitor C2 are connected with output N with described input M respectively.
In addition, on described 3rd branch road, the two ends of the second circuit breaker BBR2 are connected with output N with input M respectively.The present embodiment only lists three branch roads of Capacitor banks, in reality, more branch roads can be increased as the case may be, and each branch road is parallel with one another, every bar branch road is equipped with capacitor and short-circuiting device, the capacitor of circuit breaker on the branch road controlling its place is enabled or disconnects, and then the different capacitance of the output achieving Capacitor banks, and road of serving as theme provides series compensation.
The capacitance level that three branch roads of the Capacitor banks in the present embodiment can comprise is respectively: 0, C2, C1+C2.When only having circuit breaker BBR2 to close, capacitor C1 and C2 is bypassed, and the electric capacity of Capacitor banks is 0; As cut-off breaker BBR1 and BBR2, the electric capacity of Capacitor banks is C2; As close circuit breaker BBR1 and when disconnecting BBR2, the electric capacity of Capacitor banks is C1+C2.By arranging the 3rd branch road on Capacitor banks, achieving the capacitance of Capacitor banks three gears, further increasing adjustable capacitance, make line voltage distribution adjustable extent wider, further increase the smoothness that line voltage distribution regulates.
A kind of power distribution network series compensation circuit that the utility model embodiment provides, because Capacitor banks comprises multiple branch road, dropped into by the capacitor of each branch road in control capacitor group and disconnect, and then realize input and the disconnection of partial capacitor, avoid existing Capacitor banks can only all drop into and disconnect, add the capacitance gradient of different brackets in circuit, such as, 0, C2, C1+C2 grade, make when regulating the voltage of main line, adjustable grade increases, and then make the compensation of electric capacity more level and smooth, facilitate the alternative to the different capacitance compensation requirement of power distribution network.
In addition, control capacitor part drops into and cuts off can also avoid the whole switching of Capacitor banks to produce larger ground charging stream, causes proterctive equipment malfunction, and can avoid choosing compared with large capacitor make capacitor repeatedly switching shorten the useful life of equipment.
Be applied to above-mentioned a kind of power distribution network series compensation circuit; this programme also provides a kind of power distribution network series compensation system; as shown in Figure 4; for a kind of structural representation of power distribution network series compensation system; this system 100 comprises: substation bus bar, distribution transformer, proterctive equipment, Capacitor banks and controller; described substation bus bar is provided with distribution transformer, proterctive equipment and controller; described Capacitor banks and described proterctive equipment are connected in parallel; described controller is connected with described Capacitor banks; wherein
Described Capacitor banks comprises at least one capacitor and at least one circuit breaker, and, described Capacitor banks comprises at least two branch roads in parallel, be respectively the first branch road a1-a2 and the second branch road b1-b2, wherein, this first branch road a1-a2 is provided with successively the first circuit breaker BBR1 and the first capacitor C1, the second branch road b1-b2 is provided with the second capacitor C2.
In addition, preferably, described Capacitor banks also comprises the 3rd branch road c1-c2, and the 3rd branch road c1-c2 is in parallel with the first branch road a1-a2 and the second branch road b1-b2 respectively, and described 3rd branch road c1-c2 is provided with the second circuit breaker BBR2.
Identical with the embodiment of above-mentioned a kind of power distribution network series compensation circuit, a kind of power distribution network series compensation system that this programme provides, can the circuit breaker BBR1 of control capacitor group different branch and BBR2 opening and closing by controller, and then control capacitance group is without the capacitor switching of branch road, for substation bus bar compensate for the electric capacity of different brackets, avoid existing Capacitor banks can only all drop into and disconnect, add the capacitance gradient of different brackets in circuit.Such as, 0, C2, C1+C2 grade, make when regulating the voltage of main line, adjustable grade increases, and then makes the compensation of electric capacity more level and smooth, facilitates the alternative to the different capacitance compensation requirement of power distribution network.
In addition, control capacitor part drops into and cuts off can also avoid the whole switching of Capacitor banks to produce larger ground charging stream, causes proterctive equipment malfunction, and can avoid choosing compared with large capacitor make capacitor repeatedly switching shorten the useful life of equipment.
This programme additionally provides a kind of power distribution network serial connection compensation control method, and as shown in Figure 5, be the flow chart of the method, the method is applied to the embodiment of above-mentioned a kind of power distribution network series compensation circuit and system thereof, and concrete the method comprises:
Step S101: the voltage obtaining each field location of substation bus bar;
The voltage of each field location described obtains by the amount of voltmeter or instrument and equipment, or other has the equipment of measurement function or software and hardware obtains.In addition, in step S101, include but not limited to voltage, other physical quantity, such as electric current, the physical quantity that impedance etc. can convert voltage to also belongs in the scope of the technical program protection.
Step S102: judge that whether described voltage is higher than normal voltage 7%, or, judge that whether described voltage is lower than normal voltage 7%; Wherein, 7% of described normal voltage is in below 220KV power distribution network, the reference parameter of voltage acceptability limit, it is not a fixing value, in the process of working control capacitor group switching, this 7% can be determined according to actual concrete condition, or by controlling the scope compared to the presetting instruction of controller.
Step S103: when described voltage higher than normal voltage 7% time, the first capacitor BBR1 on first branch road of Capacitor banks is disconnected, or, when described voltage lower than normal voltage 7% time, the first capacitor BBR1 on the first branch road of Capacitor banks is closed.
The method is suitable for and the Capacitor banks comprising two parallel branches, first branch road is provided with the first circuit breaker BBR1 and the first capacitor C1, equipment second capacitor C2 on second branch road, when series compensation, first the first capacitor C1 and the second capacitor C2 is all put into operation, to serve as theme road building-out capacitor, when controller records cable voltage higher than normal voltage 7%, step S1031: disconnect the first circuit breaker BBR1, first capacitor C1 is excised from circuit, reduce the electric capacity that Capacitor banks exports, to reduce line voltage distribution; When the line voltage distribution recorded lower than normal voltage 7% time, step S1032: closed by the first capacitor BBR1, makes the first capacitor C1 drop into, to increase the electric capacity of Capacitor banks, and then improve line voltage distribution.
A kind of power distribution network serial connection compensation control method that the utility model embodiment provides; the capacitor of each branch road of Capacitor banks on substation bus bar can be regulated to drop into and disconnect by controller; and then realize different gear capacitor switching; avoid the whole switching of existing Capacitor banks and produce larger ground charging stream, cause proterctive equipment malfunction.
When Capacitor banks comprises more than two branch roads, the method for its control and compensation is similar to said method, namely controls the circuit breaker in each branch road, realizes the switching of different capacitors.When described 3rd branch road only comprises a circuit breaker, by controlling this breaker closing, carry out other branch road of bypass, and then maximally can reduce the voltage of circuit.
It should be noted that, in this article, the such as relational terms of " first " and " second " etc. and so on is only used for an entity or operation to separate with another entity or operating space, and not necessarily requires or imply the relation that there is any this reality between these entities or operation or sequentially.And, term " comprises ", " comprising " or its any other variant are intended to contain comprising of nonexcludability, thus make to comprise the process of a series of key element, method, article or equipment and not only comprise those key elements, but also comprise other key elements clearly do not listed, or also comprise by the intrinsic key element of this process, method, article or equipment.When not more restrictions, the key element limited by statement " comprising ... ", and be not precluded within process, method, article or the equipment comprising described key element and also there is other identical element.
The above is only embodiment of the present utility model, those skilled in the art is understood or realizes the utility model.To be apparent to one skilled in the art to the multiple amendment of these embodiments, General Principle as defined herein when not departing from spirit or scope of the present utility model, can realize in other embodiments.Therefore, the utility model can not be restricted to these embodiments shown in this article, but will meet the widest scope consistent with principle disclosed herein and features of novelty.
Claims (6)
1. a power distribution network series compensation circuit, it is characterized in that, comprise main line, power circuit, Capacitor banks and control circuit, wherein, described power circuit is connected with described main line, described Capacitor banks and described power circuit are in parallel, and described control circuit is connected with described Capacitor banks with described main line respectively;
Described Capacitor banks comprises: at least one capacitor and at least one circuit breaker, and, described Capacitor banks comprises at least two branch roads in parallel, be respectively the first branch road and the second branch road, wherein, described first branch road is provided with successively the first circuit breaker and the first capacitor, described second branch road is provided with the second capacitor.
2. circuit according to claim 1, is characterized in that, described Capacitor banks also comprises the 3rd branch road, described 3rd branch road respectively with described first branch road and described second branch circuit parallel connection, described 3rd branch road is provided with the second circuit breaker.
3. circuit according to claim 2, it is characterized in that, described Capacitor banks also comprises input and output, wherein, on described first branch road, one end of described first circuit breaker is connected with described input, and the other end of described first circuit breaker is connected with one end of described first capacitor, and the other end of described first capacitor is connected with described output; On described second branch road, the two ends of described second capacitor are connected with output with described input respectively.
4. circuit according to claim 3, is characterized in that, on described 3rd branch road, the two ends of described second circuit breaker are connected with output with described input respectively.
5. a power distribution network series compensation system; be applied to the power distribution network series compensation circuit described in any one of Claims 1-4; it is characterized in that; described system comprises: substation bus bar, distribution transformer, proterctive equipment, Capacitor banks and controller; described substation bus bar is provided with distribution transformer, proterctive equipment and controller, and described Capacitor banks and described proterctive equipment are connected in parallel, and described controller is connected with described Capacitor banks; wherein
Described Capacitor banks comprises at least one capacitor and at least one circuit breaker, and, described Capacitor banks comprises at least two branch roads in parallel, be respectively the first branch road and the second branch road, wherein, described first branch road is provided with successively the first circuit breaker and the first capacitor, described second branch road is provided with the second capacitor.
6. system according to claim 5, is characterized in that, described Capacitor banks also comprises the 3rd branch road, described 3rd branch road respectively with described first branch road and described second branch circuit parallel connection, described 3rd branch road is provided with the second circuit breaker.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201520962955.5U CN205141669U (en) | 2015-11-26 | 2015-11-26 | Distribution network cascade compensation circuit and system |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201520962955.5U CN205141669U (en) | 2015-11-26 | 2015-11-26 | Distribution network cascade compensation circuit and system |
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| CN205141669U true CN205141669U (en) | 2016-04-06 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105337286A (en) * | 2015-11-26 | 2016-02-17 | 云南电网有限责任公司电力科学研究院 | Series compensation circuit, system and method for power distribution network |
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2015
- 2015-11-26 CN CN201520962955.5U patent/CN205141669U/en active Active
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105337286A (en) * | 2015-11-26 | 2016-02-17 | 云南电网有限责任公司电力科学研究院 | Series compensation circuit, system and method for power distribution network |
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