CN217135155U - Quick fault isolation system for common direct current bus system - Google Patents
Quick fault isolation system for common direct current bus system Download PDFInfo
- Publication number
- CN217135155U CN217135155U CN202122585561.0U CN202122585561U CN217135155U CN 217135155 U CN217135155 U CN 217135155U CN 202122585561 U CN202122585561 U CN 202122585561U CN 217135155 U CN217135155 U CN 217135155U
- Authority
- CN
- China
- Prior art keywords
- protection module
- protection
- bus
- direct current
- load
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Active
Links
Images
Landscapes
- Emergency Protection Circuit Devices (AREA)
Abstract
The utility model discloses a quick fault isolation system for a common DC bus system, which is characterized by comprising a load protection module, a bus protection module connected with the load protection module, a valve protection module connected with the bus protection module, and an AC protection module connected with the valve protection module; the load protection module comprises a load, the bus protection module comprises a direct current bus and a direct current feeder, the valve protection module comprises a current transformer, and the alternating current protection module comprises an alternating current side; the fault area can be judged quickly and reliably when the common direct current bus system fails, the fault area is isolated, and the quick fault judgment of the direct current system is realized; the simple logic judgment is adopted, so that engineering implementation is facilitated, the problem that fault points cannot be judged possibly in the actual operation of a complex protection system is avoided, and the reliability of the protection system is improved.
Description
Technical Field
The utility model relates to a join in marriage the power consumption field, especially relate to a quick isolated system of total direct current bus system trouble.
Background
The protection configuration scheme of the multi-terminal direct-current system needs to consider the transient characteristic of the direct-current system fault, can quickly cut off a fault power supply when the multi-terminal direct-current system fails, guarantees the operation safety of the multi-terminal direct-current system equipment, and realizes the reliability and the rapidity of the protection configuration scheme. However, in terms of the action speed, because the multi-terminal direct current system adopts a large number of power electronic devices, the power electronic devices have weak short-circuit current resistance and high action speed, and are difficult to be well matched with the action time of the circuit breaker, so that the protection is easy to occur and the accurate action cannot be realized. Therefore, the protection scheme of the multi-terminal direct current system is designed when the action time of the power electronic equipment and the action time of the circuit breaker are effectively matched with each other.
Available protection means of the multi-terminal direct current system comprise power electronic locking, a circuit breaker, a fuse and the like, but the multi-terminal direct current system has large short-circuit current at the moment of fault and short duration, the upper and lower protection levels are difficult to distinguish, and an effective protection system is difficult to form only by a single protection means.
For example, a chinese patent document discloses "a fault partition method suitable for a dc power distribution system", and its publication no: CN2019107867212 discloses a method for identifying fault positions in a dc bus system partition, but it is impossible to determine the area reliability by a protection means.
Disclosure of Invention
Therefore, the utility model provides a for this, the utility model provides a be total to quick isolated system of direct current bus-bar system trouble can realize total to quick reliable judgement fault area when direct current bus-bar system breaks down, keeps apart fault area, realizes direct current system's trouble rapid judgement.
In order to achieve the above object, the present invention provides the following technical solutions:
a common direct current bus system fault rapid isolation system comprises a load protection module, a bus protection module connected with the load protection module, a valve protection module connected with the bus protection module, and an alternating current protection module connected with the valve protection module;
the load protection module comprises a load, the bus protection module comprises a direct current bus and a direct current feeder, the valve protection module comprises a converter, and the alternating current protection module comprises an alternating current side. The fault area can be judged quickly and reliably when the common direct current bus system fails, and the fault area is isolated.
Preferably, the valve protection module and the load protection module further include: an electronic device latch, and a fast fuse connected to the electronic device latch. The reliability of the protection system is improved.
Preferably, the valve protection module further comprises an ac circuit breaker connected to the fast acting fuse.
Preferably, the bus bar protection module further comprises a dc breaker connected to the dc bus bar.
Preferably, the ac protection module further comprises an ac circuit breaker connected to the ac side. And the simple logic judgment is used for facilitating the engineering realization.
Preferably, the electronic device closing operation time is 100us, the quick fuse operation time is 1-10 ms, and the ac circuit breaker is 100ms or more.
Preferably, the module protection is as follows according to the action rate from fast to slow: the valve area protection module is a load protection module < a bus protection module < an ac protection module.
The utility model discloses an embodiment has following advantage:
(1) the fault area can be judged quickly and reliably when the common direct current bus system fails, the fault area is isolated, and the quick fault judgment of the direct current system is realized; (2) the method has the advantages that simple logic judgment is adopted, engineering implementation is facilitated, the problem that fault points cannot be judged possibly in the actual operation of a complex protection system is avoided, and the reliability of the protection system is improved; (3) the failure region can be determined by setting a weight according to the protection means.
Drawings
In order to illustrate the present invention or the prior art more clearly, the drawings needed for the description of the embodiments or the prior art will be briefly described below. It should be apparent that the drawings in the following description are merely exemplary, and that other embodiments can be derived from the drawings provided by those of ordinary skill in the art without inventive effort.
The structure, ratio, size and the like shown in the present specification are only used for matching with the content disclosed in the specification, so as to be known and read by people familiar with the technology, and are not used for limiting the limit conditions which can be implemented by the present invention, so that the present invention has no technical essential significance, and any structure modification, ratio relationship change or size adjustment still falls within the scope which can be covered by the technical content disclosed by the present invention without affecting the efficacy which can be produced by the present invention and the achievable purpose.
FIG. 1 is a schematic diagram of a typical common DC bus system.
In the figure:
4-an alternating current protection module; 5-a valve protection module; 6-bus protection module; 7-load protection module.
Detailed Description
Embodiments of the present invention will be described in detail below with reference to specific embodiments, and other advantages and effects of the present invention will be apparent from the technical understanding that the present invention is disclosed in the specification, and it is to be understood that the described embodiments are not all embodiments of the present invention. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative work belong to the protection scope of the present invention.
As shown in fig. 1, in a preferred embodiment, the utility model discloses a quick fault isolation system for common dc bus system, the technical solution is as follows:
a typical common dc bus system configuration is shown in fig. 1. The common direct current bus comprises a plurality of AC/DC converter devices, a direct current bus, a direct current feeder line and a direct current load.
The common direct current bus system source, network and load are protected and partitioned, and generally can be divided into 4 fault areas, and common protection means, action time limit and protection requirements of each area comprise:
(1) valve protection module
Protection means: electronic device latches, fast fuses, ac circuit breakers;
protection time limit: the electronic device locking action time is about 100us, the quick fuse action time is 1-10 ms, and the alternating current circuit breaker is more than 100 ms;
protection requirements: the valve protection module mainly comprises a rectifier, an inverter and a direct current converter, and the electronic valve protection area mainly protects the self components from faults.
(2) Load protection module
Protection means: electronic device lockout, fast fuses;
protection time limit: the electronic device locking action time is about 100us, and the quick fuse action time is 1-10 ms;
protection requirements: the load protection module mainly comprises a direct current load and an alternating current load, wherein the load mainly comprises an electric automobile charging pile, and therefore load protection is mainly used for protecting components of the charging pile.
(3) Bus protection module
Protection means: fast fuses, direct current circuit breakers;
protection time limit: the action time of the fast fuse is 1-10 ms, and the action time of the direct current breaker is more than 10 ms;
protection requirements: the bus protection module mainly comprises a direct current bus and a direct current feeder, and direct current cable faults are generally permanent faults and can be divided into single-pole grounding faults, inter-pole short-circuit faults, disconnection faults and the like.
(4) The alternating current protection module: (more than 10 ms)
Protection means: an alternating current circuit breaker;
protection time limit: the action time of the alternating current breaker is more than 100 ms;
protection requirements: the alternating current protection module mainly comprises an alternating current power supply and an alternating current transformer. Ac system faults are dominated by ac line short circuit faults, including single phase short circuits, two phase ground/ungrounded short circuits, and three phase symmetric short circuits.
The protection of each module is as follows according to the action rate from fast to slow: valve zone protection is load protection < dc network protection < ac protection.
When a malfunction occurs, it is possible to prevent,
(1) fault of ac protection module
When the alternating current protection module breaks down, firstly, the valve area protection electronic device is locked to act (the fast fuse serves as a backup), the connection between the direct current side and the alternating current side is cut off, the direct current side is prevented from reversely outputting short-circuit current to the alternating current side, the direct current bus protection module and the load protection module do not act, and finally, the alternating current protection module acts to cut off the fault current; the power supply is stopped in both the DC area and the AC area.
(2) Electronic valve protection module failure
When the electronic valve protection module breaks down, firstly, an electronic device of the electronic valve protection module is locked to act (a quick fuse serves as a backup), the connection between the electronic device and an alternating current side and the connection between the electronic device and the direct current side are cut off, a fault point disappears after the electronic valve protection module acts, short-circuit current is reduced, and the direct current bus protection module, the load protection module and the alternating current protection module do not act; the power supply is stopped in the direct current area, and the alternating current area has no influence.
(3) Load protection module failure
When the load protection module breaks down, firstly, the electronic valve protection area device is locked to act (the fast fuse serves as a backup), a power supply point is cut off, secondly, the load protection area acts, the connection between the load and the network is disconnected, and the alternating current protection module and the direct current bus protection module do not act; the power supply is stopped in the direct current area, and the alternating current area has no influence.
(4) Bus protection module failure
When the bus protection module breaks down, firstly, the electronic valve protection module acts and the load protection module acts to disconnect the connection between a power supply and a load and a direct current network, secondly, a direct current breaker of the bus protection module acts (a fast fuse serves as a backup), and the alternating current protection module does not act; the power supply is stopped in the direct current area, and the alternating current area has no influence.
The protection action results are shown in table 1, where 1 indicates action and 0 indicates no action.
Table 1 protection action and fault area correspondence table
Although the invention has been described in detail with respect to the general description and the specific embodiments, it will be apparent to those skilled in the art that modifications and improvements can be made based on the invention. Therefore, such modifications and improvements are intended to be within the scope of the invention as claimed.
Claims (2)
1. A common direct current bus system fault rapid isolation system is characterized by comprising a load protection module, a bus protection module connected with the load protection module, a valve protection module connected with the bus protection module, and an alternating current protection module connected with the valve protection module;
the load protection module comprises a load, the bus protection module comprises a direct current bus and a direct current feeder, the valve protection module comprises a current transformer, and the alternating current protection module comprises an alternating current side;
the valve protection module and the load protection module further include: an electronic device latch, a fast fuse connected to the electronic device latch;
the valve protection module further comprises an alternating current circuit breaker connected with the fast acting fuse;
the bus protection module also comprises a direct current breaker connected with the direct current bus;
the alternating current protection module also comprises an alternating current breaker connected with the alternating current side;
the protection of each module is as follows according to the action rate from fast to slow: valve area protection = load protection < dc network protection < ac protection.
2. A common DC bus system fault quick isolation system as claimed in claim 1, wherein the electronic device locking action time is 100us, the quick fuse action time is 1-10 ms, and the AC circuit breaker is more than 100 ms.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202122585561.0U CN217135155U (en) | 2021-10-27 | 2021-10-27 | Quick fault isolation system for common direct current bus system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202122585561.0U CN217135155U (en) | 2021-10-27 | 2021-10-27 | Quick fault isolation system for common direct current bus system |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN217135155U true CN217135155U (en) | 2022-08-05 |
Family
ID=82614064
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202122585561.0U Active CN217135155U (en) | 2021-10-27 | 2021-10-27 | Quick fault isolation system for common direct current bus system |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN217135155U (en) |
-
2021
- 2021-10-27 CN CN202122585561.0U patent/CN217135155U/en active Active
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN112615358A (en) | Ship direct-current networking electric propulsion system and short-circuit fault rapid protection method | |
| CN104836330A (en) | Method for quickly detecting bus PT three-phase disconnection of automatic switching device of standby power supply and method for preventing maloperation of bus PT three-phase disconnection of automatic switching device of standby power supply | |
| CN106856332A (en) | A kind of distributed photovoltaic power generation grid-connected system | |
| CN109066605A (en) | The coordination control strategy of DC transmission system positive and negative anodes dc circuit breaker | |
| CN217135155U (en) | Quick fault isolation system for common direct current bus system | |
| CN105244857B (en) | Prevent power network distance protection first start after decompression malfunction method | |
| CN111509701A (en) | Single bus wiring structure | |
| CN104009453B (en) | A kind of fault detection method for micro-capacitance sensor off-grid operation situation | |
| CN205786965U (en) | The device of a kind of electric power system power generation circuit earthing wire-selecting and comprehensive protector | |
| CN105244858A (en) | Method for preventing misoperation caused by voltage loss after starting distance protection of power grid | |
| CN104022492A (en) | Auxiliary short circuit protection device for low-voltage power supply device of long-distance mine laneway | |
| Shao et al. | Research and application of the control and protection strategy for the±500kV Xiluodu-Guangdong double bipole HVDC project | |
| CN210806740U (en) | Three-way low-voltage power supply device and power supply system | |
| CN210223831U (en) | Electric five-prevention locking loop | |
| CN114285005A (en) | Common direct current bus system fault rapid isolation method | |
| US20130188285A1 (en) | Method of operating integrated circuit breaker module for solar power system | |
| CN207039179U (en) | A kind of New Fault Current Limiter | |
| CA2268203C (en) | System interconnection device and method of designing same | |
| RU104390U1 (en) | DC SHIELD (OPTIONS) | |
| CN110854804A (en) | Power supply comprehensive protection device | |
| CN220367356U (en) | Device for detecting correctness of installation phase sequence of secondary fusion circuit breaker | |
| CN216794615U (en) | Marine direct-current busbar system | |
| CN112087048B (en) | High-voltage plant branch zero-sequence protection configuration system and method | |
| Theron et al. | Case study: Transformer Differential Incorrect Operation due to System Grounding | |
| CN113466632B (en) | Uninterrupted DC grounding searching system and uninterrupted DC grounding searching method |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| GR01 | Patent grant | ||
| GR01 | Patent grant |