CN110556798A - fault partition method suitable for direct-current power distribution system - Google Patents
fault partition method suitable for direct-current power distribution system Download PDFInfo
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- CN110556798A CN110556798A CN201910786721.2A CN201910786721A CN110556798A CN 110556798 A CN110556798 A CN 110556798A CN 201910786721 A CN201910786721 A CN 201910786721A CN 110556798 A CN110556798 A CN 110556798A
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H7/00—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions
- H02H7/26—Sectionalised protection of cable or line systems, e.g. for disconnecting a section on which a short-circuit, earth fault, or arc discharge has occured
- H02H7/268—Sectionalised protection of cable or line systems, e.g. for disconnecting a section on which a short-circuit, earth fault, or arc discharge has occured for dc systems
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Abstract
The invention discloses a fault partitioning method suitable for a direct current power distribution system, which comprises the following steps: according to a basic division method of a power system protection area, a direct current distribution system is divided into the following steps: the system comprises an alternating current system protection area, a current converter protection area, a direct current transformer protection area, a direct current line protection area and an equipment protection area; if the direct current power distribution system equipment fails, determining a protection area to which the failed equipment belongs according to the type of the failed equipment; and determining the position of the fault equipment according to the position of the protection area to which the fault equipment belongs, and performing troubleshooting. The partitioning method provided by the invention divides a direct current power distribution system with a large coverage area into a plurality of groups of protection areas, improves the troubleshooting efficiency and the fault protection effect of the direct current power distribution system, and is convenient for managing the direct current power distribution system.
Description
Technical Field
The invention belongs to the field of direct current power distribution, and particularly relates to a fault partitioning method suitable for a direct current power distribution system.
Background
compared with an alternating-current distribution network, the direct-current distribution network provides a direct-current bus for loads, the direct-current loads can be directly supplied with power by the direct-current bus, the alternating-current loads need to be supplied with power after passing through inverter equipment, and if the proportion of the direct-current loads in the loads is large, the direct-current distribution network has great advantages. The direct-current distribution network has small line loss, high reliability, no need of phase-frequency control and strong distributed power supply accepting capability.
however, the direct-current power distribution network has a complex structure and a large coverage area, and when the power distribution network fails, a great deal of energy and resources are consumed to screen and maintain the faults. Moreover, the maintenance time is too long, which can affect the normal power utilization of users and cause greater economic loss.
disclosure of Invention
in view of the above problem, the present invention provides a fault partitioning method suitable for a dc power distribution system, where the partitioning method includes:
According to a basic division method of a power system protection area, a direct current distribution system is divided into the following steps: the system comprises an alternating current system protection area, a current converter protection area, a direct current transformer protection area, a direct current line protection area and an equipment protection area;
if the direct current power distribution system equipment fails, determining a protection area to which the failed equipment belongs according to the type of the failed equipment;
And determining the position of the fault equipment according to the position of the protection area to which the fault equipment belongs, and performing troubleshooting.
Further, the alternating current system protection area comprises: connecting a transformer, an alternating current distribution network and an alternating current circuit connecting the valve side of the transformer to a current converter;
The converter protection zone comprises: a current converter;
The direct current transformer protection area includes: the direct current transformer and a high-low voltage direct current bus connected with the direct current transformer;
The direct current line protection area includes: a DC line and a switching device on the DC line;
the device protection area includes: the converter comprises a plurality of groups of power systems connected into the direct current power distribution system and converter equipment corresponding to the power systems.
further, the basic dividing method of the power system protection area comprises the following steps:
Determining a protected object in a direct current power distribution system;
determining a function realized by a power system protection area according to the function of a protected object;
and dividing the direct current power distribution system according to the function realized by the power system protection area.
further, the protected object comprises an alternating current system, an inverter, a direct current transformer, an alternating current transformer, a direct current line and a direct current bus.
further, the ac system protection area includes a first ac distribution network, a first coupling transformer, and a first ac circuit breaker; the first alternating-current power distribution network is communicated with the network side of the first connecting transformer through an alternating-current line, and the valve side of the first connecting transformer is communicated with one end of the first alternating-current circuit breaker through an alternating-current line;
The alternating current system protection area further comprises a second alternating current circuit breaker, a second connection transformer and a second alternating current distribution network; one end of the second alternating current circuit breaker is connected with the valve side of the second interconnection transformer through an alternating current line, and the network side of the second interconnection transformer is connected with the second alternating current distribution network through an alternating current line;
the alternating current system protection area further comprises a third alternating current circuit breaker, a third connecting transformer and a third alternating current distribution network; one end of the third alternating current circuit breaker is connected with the valve side of the third connecting transformer through an alternating current line, and the network side of the third connecting transformer is connected with the third alternating current distribution network through an alternating current line.
further, the converter protection region comprises a first converter;
The converter protection area also comprises a sixth direct current breaker and a second converter; one end of the sixth direct current breaker is connected with the direct current end of the second converter through a direct current line;
the converter protection zone further comprises a third converter.
further, the dc transformer protection area includes a fifth dc breaker, a dc transformer, and a dc bus; one end of the fifth direct current breaker is connected with one end of the direct current transformer through a direct current line, and the other end of the direct current transformer is connected with the direct current bus through a direct current line.
Further, the dc line protection zone comprises a first dc breaker and a first dc line; one end of the first direct current line is connected with one end of the first direct current breaker;
The direct-current line protection area also comprises a second direct-current circuit breaker and a second direct-current line; one end of the second direct current line is connected with one end of the second direct current breaker;
The direct-current line protection area further comprises a third direct-current circuit breaker, a third direct-current line, a fourth direct-current line, a fifth direct-current line and a fourth direct-current circuit breaker; one end of the third direct current breaker is connected with one end of the fourth direct current breaker through a third direct current line, a fifth direct current line and a fourth direct current breaker; one end of the fourth direct current line is connected to the connection position of the third direct current line and the fifth direct current line.
further, the equipment protection area comprises a photovoltaic power generation system, an energy storage system, a charging pile, a direct current load and an alternating current load; the photovoltaic power generation system, the energy storage system, the charging pile, the direct current load and the alternating current load are respectively connected with a direct current bus in the protection area of the direct current transformer through a cable; each group of cables is provided with a direct current breaker; and a current converter is arranged between the alternating current load and the direct current bus.
Further, the other end of the first ac circuit breaker in the ac system protection area is connected to the ac end of the first converter in the converter protection area via an ac line;
the direct current end of the first converter is connected with one end of a first direct current breaker in the direct current line protection area through a first direct current line;
The other end of the first direct current breaker is connected with one end of a second direct current breaker in the direct current line protection area through a direct current line; the other end of the first direct current breaker is connected with the other end of a third direct current breaker in the direct current line protection area through a direct current line;
the other end of the second direct current breaker is connected with the other end of a sixth direct current breaker in the converter protection area through a second direct current line;
the alternating current end of a second converter in the converter protection area is connected with the other end of a second alternating current breaker in the alternating current system protection area through an alternating current line;
The other end of a fourth direct-current line in the direct-current line protection area is connected with the other end of a fifth direct-current breaker in the direct-current transformer protection area; the other end of the fourth direct current breaker in the direct current line protection area is connected with the direct current end of the third converter in the converter protection area through a direct current line;
and the alternating current end of the third converter is connected with the other end of a third alternating current breaker in the alternating current system protection area through an alternating current line.
The partitioning method provided by the invention divides a direct current power distribution system with huge coverage area into a plurality of protection areas, and rapidly positions the positions of the protection areas where fault equipment is located according to the types of the fault equipment, thereby rapidly troubleshooting. The fault protection effect of the direct current power distribution system is improved, the direct current power distribution system is convenient to supervise, and the fault removing efficiency is improved.
Additional features and advantages of the invention will be set forth in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention. The objectives and other advantages of the invention will be realized and attained by the structure particularly pointed out in the written description and claims hereof as well as the appended drawings.
drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and those skilled in the art can also obtain other drawings according to the drawings without creative efforts.
FIG. 1 illustrates a DC power distribution system zone diagram according to an embodiment of the present invention;
Fig. 2 shows a schematic diagram of a flexible dc power distribution system protection area division according to an embodiment of the present invention.
In the figure: 1 a first power station, 2 a first converter station, 3 an intermediate switching station, 4 a second converter station, 5 a second power station, 6 a third converter station, 7 an intermediate buck converter station, 8 a third power station.
Detailed Description
in order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are some, but not all, embodiments of the present invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
The invention provides a fault partitioning method suitable for a direct current power distribution system, which comprises the following steps:
According to the basic division method of the protection area of the power system, the direct current distribution system is divided into the following parts: the system comprises an alternating current system protection area, a current converter protection area, a direct current transformer protection area, a direct current line protection area and an equipment protection area;
If the direct current power distribution system equipment fails, determining a protection area to which the failed equipment belongs according to the type of the failed equipment;
and determining the position of the fault equipment according to the position of the protection area to which the fault equipment belongs, and performing troubleshooting.
Specifically, before the protection area division is performed on the dc power distribution system, the protected object in the dc power distribution system needs to be determined. For example, the protected object in the dc medium voltage distribution system can be divided into several different parts, such as an ac system, an inverter, a dc transformer, a dc line, and a dc bus. The alternating current system refers to an alternating current covering part connected with the converter and comprises a connecting transformer, an alternating current distribution network, an alternating current line connecting the valve side of the transformer to the converter and the like; the converter is a voltage source converter connected between an alternating current system and a direct current system; the direct current transformer refers to a current converter connected between direct current systems with different voltage levels.
After the protected object in the direct current power distribution system is determined, according to a basic dividing method of a protection area of the power system, simplifying protection configuration into partition targets, namely, taking the protected object as a specific protection target of the protection area, and simplifying connection relation among the protection targets and other connection equipment. According to the functions implemented by each protection target, as shown in fig. 1, for example, the dc medium voltage distribution system may be divided into 5, but not limited to 5, protection regions, and the 5 protection regions are an ac system protection region, an inverter protection region, a dc transformer protection region, a dc line protection region, and an equipment protection region, respectively.
Specifically, the alternating current system protection area comprises a transformer, an alternating current distribution network and an alternating current circuit for connecting the valve side of the transformer to the converter; the converter protection region comprises a converter; the direct current line protection area comprises a line body and direct current switch equipment on two sides; the direct current transformer protection area comprises a direct current transformer and a high-low voltage direct current bus connected with the direct current transformer; the equipment protection area includes various types of equipment or systems accessed by the dc power distribution system, for example: alternating current load, direct current microgrid, energy storage system, etc. Specifically, the electrical equipment or the power system connected to the dc power distribution system and the corresponding current converting equipment in the equipment protection area all belong to the protection configuration range of the dc power distribution system.
Fig. 2 shows a schematic diagram of a flexible dc power distribution system protection area division according to an embodiment of the present invention. For example, as shown in fig. 2, a direct current medium voltage distribution system formed among the first power station 1, the first converter station 2, the intermediate switching station 3, the second converter station 4, the second power station 5, the third converter station 6, and the intermediate buck converter station 7 is exemplified.
The direct current medium voltage distribution system is divided into eleven protection zones according to a basic division method of a protection zone of an electric power system. Wherein:
The protection zone one comprises a first AC distribution network AC1, a first connection transformer T1 and a first AC circuit breaker ACB 1. Wherein a first alternating current distribution network AC1 is arranged at the first power station 1, a first alternating current breaker ACB1 is arranged at the first converter station 2 and a first connecting transformer T1 is arranged between the first power station 1 and the first converter station 2. Specifically, the first AC distribution network AC1 is connected to the grid side of the first connecting transformer T1 via an AC line, the valve side of the first connecting transformer T1 is connected to one end of the first AC breaker ACB1 via an AC line, and the other end of the first AC breaker ACB1 is connected to the AC end of the first converter VSC1 of the first converter station 2. According to the above method for dividing the protection area, the protection area is an ac system protection area.
The protection zone two comprises a first converter VSC 1. Wherein a first converter VSC1 is arranged at the first converter station 2, the power of the first converter VSC1 being 10 MW. Specifically, an alternating current end of the first converter VSC1 is connected to one end of the first alternating current breaker ACB1 through a cable; the dc terminals of the first converter VSC1 are connected via a first dc line L1 to one end of a first dc breaker DCB1 in the intermediate switchyard 3. According to the method for dividing the protection area, the second protection area is the converter protection area.
Protection zone three includes a first dc breaker DCB1 and a first dc link L1. Wherein the first dc breaker DCB1 is provided at the intermediate switchyard 3; the first converter station 2 and the intermediate switching station 3 are connected by a first dc line L1. Specifically, one end of the first dc breaker DCB1 is connected to the dc terminal of the first converter VSC1 via a first dc line L1. According to the above method for dividing the protection area, the protection area three is a dc line protection area.
the protection zone four includes a second dc breaker DCB2 and a second dc line L2. Wherein the second dc breaker DCB2 is provided at the intermediate switchyard 3; the intermediate switching station 3 and the second converter station 4 are connected by a second direct current line L2. In particular, the second dc breaker DCB2 is connected to the sixth dc breaker DCB6 of the second converter station 4 via a second dc line L2. The second dc breaker DCB2 is electrically connected to the first dc breaker DCB 1. According to the method for dividing the protection area, the protection area four is a direct current line protection area.
The protection zone five comprises a sixth dc breaker DCB6 and a second converter VSC 2. Wherein the sixth dc breaker DCB6 and the second converter VSC2 are both arranged at the second converter station 4, and the power of the second converter VSC2 is 20 MW. Specifically, one end of the sixth dc breaker DCB6 is connected to the second dc breaker DCB2 through the second dc line L2, the other end of the sixth dc breaker DCB6 is connected to the dc end of the second converter VSC2 through a cable, and the ac end of the second converter VSC2 is connected to the second ac breaker ACB2 in the second converter station 4 through an ac line. According to the method for dividing the protection area, the protection area five is the converter protection area.
the protection zone six comprises a second AC circuit breaker ACB2, a second link transformer T2 and a second AC distribution network AC 2. Wherein a second AC breaker ACB2 is arranged at the second converter station 4, a second AC distribution network AC2 is arranged at the second power station 5 and a second link transformer T2 is arranged between the second converter station 4 and the second power station 5. Specifically, one end of the second AC breaker ACB2 is connected to the second converter VSC2 via a cable, the other end of the second AC breaker ACB2 is connected to the valve side of the second coupling transformer T2 via an AC line, and the grid side of the second coupling transformer T2 is connected to the second AC distribution grid AC2 via an AC line. According to the method for dividing the protection area, the protection area six is an alternating current system protection area.
The protection zone seven comprises a third dc breaker DCB3, a third dc line L3, a fourth dc line L4, a fifth dc line L5 and a fourth dc breaker DCB 4. Wherein the third dc breaker DCB3 is provided at the intermediate switchyard 3; a fourth dc breaker DCB4 is arranged at the third converter station 6; the intermediate switchyard 3 and the third converter station 6 are connected by a third direct current line L3 and a fifth direct current line L5; the intermediate switchyard 3 and the intermediate buck converter station 7 are connected by a third direct current line L3 and a fourth direct current line L4. Specifically, the first dc breaker DCB1, the second dc breaker DCB2, and the third dc breaker DCB3 in the intermediate switchyard 3 are electrically connected to each other. The third dc breaker DCB3 is connected via a third dc link L3, a fifth dc link L5 and a fourth dc breaker DCB 4. Specifically, the third dc link L3 and the fifth dc link L5 are connected in series. Further, a fourth dc breaker DCB4 is connected via cables to the dc terminals of the third converter VSC 3. Further, the third dc breaker DCB3 is connected via a third dc line L3, a fourth dc line L4 and a fifth dc breaker DCB5 in the intermediate step-down converter station 7. Specifically, the third dc link L3 and the fourth dc link L4 are connected in series. According to the method for dividing the protection area, the protection area seven is a direct-current line protection area.
the protection zone eight comprises a fifth direct current breaker DCB5 comprising a fifth direct current breaker DCB5, a direct current transformer DCT and a 375V direct current bus. Wherein the fifth dc breaker DCB5, the dc transformer DCT and the 375V dc bus are all arranged at the intermediate buck converter station 7, and the power of the dc transformer DCT is 2 MW. Specifically, the fifth dc breaker DCB5 is connected to the third dc breaker DCB3 through a fourth dc line L4, a third dc line L3, the other end of the fifth dc breaker DCB5 is connected to the high-voltage end of the dc transformer DCT through a dc line, and the low-voltage end of the dc transformer DCT is connected to the 375V dc bus through a dc line. According to the method for dividing the protection area, the protection area eight is the protection area of the direct-current transformer.
the protection area nine comprises a plurality of groups of access systems and access equipment, such as a 0.7MW photovoltaic power generation system, a 1MW energy storage system, a 1MW charging pile, a 0.5MW direct current load and a 0.5MW alternating current load which are accessed in the intermediate buck converter station 7. Specifically, each group of access systems or access equipment is respectively connected with a 375V direct current bus, and a direct current breaker is arranged between each group of access systems or access equipment and the 375V direct current bus. Further, an inverter with 500KW power is arranged between the 0.5MW AC load and the 375V DC bus. According to the above method for dividing the protection area, the protection area nine is an equipment protection area. In the ninth protection area, for example, a photovoltaic power generation system of 0.7MW, an energy storage system of 1MW, a charging pile of 1MW, an electric power system and electric equipment such as a direct current load of 0.5MW, an alternating current load of 0.5MW, and a current converter with power of 500kW arranged between the alternating current load of 0.5MW and a 375V direct current bus all belong to the equipment protection configuration range of the direct current medium voltage distribution system.
The protection zone ten comprises a third converter VSC 3. Wherein a third converter VSC3 is arranged at the third converter station 6 and the power of the third converter VSC3 is 10 MW. In particular, the third converter VSC3 is connected via a dc line to a fourth dc breaker DCB4, and the valve side of the third converter VSC3 is connected via an ac line to a third ac breaker ACB3 in the third converter station 6. According to the method for dividing the protection area, the protection area ten is the converter protection area.
The protection zone eleven comprises a third AC circuit breaker ACB3, a third junction transformer T3 and a third AC distribution network AC 3. Wherein a third ac breaker ACB3 is provided at the third converter station 6; a third alternating current distribution network AC3 is provided at the third power station 8; a third coupling transformer T3 is arranged between the third converter station 6 and the third station 8. Specifically, one end of the third AC circuit breaker ACB3 is connected to the fourth dc circuit breaker DCB4 via an AC line, the other end of the third AC circuit breaker ACB3 is connected to one end of the third connecting transformer T3 via an AC line, and the valve side of the third connecting transformer T3 is connected to the third AC distribution grid AC3 via an AC line. According to the method for dividing the protection area, the protection area eleven is an alternating current system protection area.
the partitioning method provided by the present invention is not limited to the dc medium voltage distribution system composed of the above-mentioned eleven protection regions, but is also applicable to other dc distribution systems.
a direct current power distribution system with a large coverage area is divided into a plurality of groups of protection areas, and the functional structure of each protection area is clear and single. When the direct current power distribution system breaks down, the protection area where the fault occurs can be quickly determined according to the fault type, the fault position can be quickly determined according to the position of the protection area, and fault elimination processing is carried out. The maintenance efficiency of the direct current power distribution system is improved, and the direct current power distribution system is convenient to manage.
Although the present invention has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; and such modifications or substitutions do not depart from the spirit and scope of the corresponding technical solutions of the embodiments of the present invention.
Claims (10)
1. a fault zoning method for a dc power distribution system, the zoning method comprising:
according to a basic division method of a power system protection area, a direct current distribution system is divided into the following steps: the system comprises an alternating current system protection area, a current converter protection area, a direct current transformer protection area, a direct current line protection area and an equipment protection area;
if the direct current power distribution system equipment fails, determining a protection area to which the failed equipment belongs according to the type of the failed equipment;
And determining the position of the fault equipment according to the position of the protection area to which the fault equipment belongs, and performing troubleshooting.
2. The partitioning method according to claim 1,
the alternating current system protection area comprises: connecting a transformer, an alternating current distribution network and an alternating current circuit connecting the valve side of the transformer to a current converter;
The converter protection zone comprises: a current converter;
the direct current transformer protection area includes: the direct current transformer and a high-low voltage direct current bus connected with the direct current transformer;
The direct current line protection area includes: a DC line and a switching device on the DC line;
The device protection area includes: the converter comprises a plurality of groups of power systems connected into the direct current power distribution system and converter equipment corresponding to the power systems.
3. The partitioning method according to claim 1, wherein the basic partitioning method of the power system protection area comprises:
determining a protected object in a direct current power distribution system;
Determining a function realized by a power system protection area according to the function of a protected object;
And dividing the direct current power distribution system according to the function realized by the power system protection area.
4. The partition method of claim 3 wherein the protected objects include AC systems, inverters, DC transformers, AC transformers, DC lines and DC buses.
5. the method of partitioning according to claim 1, wherein the ac system protection area comprises a first ac distribution network, a first coupling transformer and a first ac circuit breaker; the first alternating-current power distribution network is communicated with the network side of the first connecting transformer through an alternating-current line, and the valve side of the first connecting transformer is communicated with one end of the first alternating-current circuit breaker through an alternating-current line;
the alternating current system protection area further comprises a second alternating current circuit breaker, a second connection transformer and a second alternating current distribution network; one end of the second alternating current circuit breaker is connected with the valve side of the second interconnection transformer through an alternating current line, and the network side of the second interconnection transformer is connected with the second alternating current distribution network through an alternating current line;
The alternating current system protection area further comprises a third alternating current circuit breaker, a third connecting transformer and a third alternating current distribution network; one end of the third alternating current circuit breaker is connected with the valve side of the third connecting transformer through an alternating current line, and the network side of the third connecting transformer is connected with the third alternating current distribution network through an alternating current line.
6. the method of partitioning according to claim 1, wherein the converter protection region comprises a first converter;
The converter protection area also comprises a sixth direct current breaker and a second converter; one end of the sixth direct current breaker is connected with the direct current end of the second converter through a direct current line;
The converter protection zone further comprises a third converter.
7. the partitioning method according to claim 1, wherein the dc transformer protection zone comprises a fifth dc breaker, a dc transformer and a dc bus; one end of the fifth direct current breaker is connected with one end of the direct current transformer through a direct current line, and the other end of the direct current transformer is connected with the direct current bus through a direct current line.
8. The method of partitioning according to claim 1, wherein the dc line protection zone comprises a first dc breaker and a first dc line; one end of the first direct current line is connected with one end of the first direct current breaker;
The direct-current line protection area also comprises a second direct-current circuit breaker and a second direct-current line; one end of the second direct current line is connected with one end of the second direct current breaker;
the direct-current line protection area further comprises a third direct-current circuit breaker, a third direct-current line, a fourth direct-current line, a fifth direct-current line and a fourth direct-current circuit breaker; one end of the third direct current breaker is connected with one end of the fourth direct current breaker through a third direct current line, a fifth direct current line and a fourth direct current breaker; one end of the fourth direct current line is connected to the connection position of the third direct current line and the fifth direct current line.
9. The zoning method according to claim 1, wherein the equipment protection zone comprises a photovoltaic power generation system, an energy storage system, a charging pile, a direct current load and an alternating current load; the photovoltaic power generation system, the energy storage system, the charging pile, the direct current load and the alternating current load are respectively connected with a direct current bus in the protection area of the direct current transformer through a cable; each group of cables is provided with a direct current breaker; and a current converter is arranged between the alternating current load and the direct current bus.
10. a method of zoning according to claim 1, wherein the other end of the first ac breaker in the ac system protection zone is connected to the ac end of the first converter in the converter protection zone via an ac line;
The direct current end of the first converter is connected with one end of a first direct current breaker in the direct current line protection area through a first direct current line;
the other end of the first direct current breaker is connected with one end of a second direct current breaker in the direct current line protection area through a direct current line; the other end of the first direct current breaker is connected with the other end of a third direct current breaker in the direct current line protection area through a direct current line;
The other end of the second direct current breaker is connected with the other end of a sixth direct current breaker in the converter protection area through a second direct current line;
the alternating current end of a second converter in the converter protection area is connected with the other end of a second alternating current breaker in the alternating current system protection area through an alternating current line;
The other end of a fourth direct-current line in the direct-current line protection area is connected with the other end of a fifth direct-current breaker in the direct-current transformer protection area; the other end of the fourth direct current breaker in the direct current line protection area is connected with the direct current end of the third converter in the converter protection area through a direct current line;
and the alternating current end of the third converter is connected with the other end of a third alternating current breaker in the alternating current system protection area through an alternating current line.
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| CN103236712A (en) * | 2013-04-08 | 2013-08-07 | 嘉兴清源电气科技有限公司 | Direct-current micro-grid system and control method thereof |
| CN103457246A (en) * | 2013-09-10 | 2013-12-18 | 中国人民解放军海军工程大学 | Method for protecting medium-voltage direct-current power supply direct current zone distribution networks |
| CN105322536A (en) * | 2015-10-23 | 2016-02-10 | 深圳供电局有限公司 | Protection configuration method for typical multi-terminal flexible direct current power distribution system |
| CN207283164U (en) * | 2017-09-30 | 2018-04-27 | 三峡大学 | A kind of high reliability DC distribution net system containing more busbares |
| CN110048394A (en) * | 2019-05-24 | 2019-07-23 | 广东电网有限责任公司 | DC distribution net start and stop method, apparatus and equipment based on stelliform connection topology configuration |
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Application publication date: 20191210 |