CN205246812U - Fault detection device of flexible direct current circuit - Google Patents
Fault detection device of flexible direct current circuit Download PDFInfo
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- CN205246812U CN205246812U CN201521076457.7U CN201521076457U CN205246812U CN 205246812 U CN205246812 U CN 205246812U CN 201521076457 U CN201521076457 U CN 201521076457U CN 205246812 U CN205246812 U CN 205246812U
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- electric capacity
- switch
- direct current
- line
- current circuit
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Abstract
The utility model discloses a fault detection device of flexible direct current circuit, include energy memory and the controllable device that is connected with energy memory one end, energy memory's other end ground connection, the flexible dc circuit that awaits measuring is connected through the switch or at a distance from the sword to the other end of controllable device, energy memory includes electric capacity and the inductance of establishing ties with electric capacity, perhaps includes electric capacity and the resistance of establishing ties with electric capacity, what controllable device adopted is switch or controllable power electronic device, controllable power electronic device includes the series connection thyristor of a plurality of inverse parallels, perhaps includes the series connection accuse type full device of a plurality of inverse parallels, perhaps includes a plurality of anti -parallel diode's series connection accuse type full device. The utility model discloses a fault detection device can be determined the nature and distinguished the trouble is permanence or instantaneity trouble, has avoided change of current valve to rerun in the trouble, reduces the damage to primary equipment.
Description
Technical field
The utility model relates to a kind of failure detector of flexible direct current circuit, belongs to Technology of HVDC based Voltage Source Converter field.
Background technology
Flexible DC power transmission adopts voltage-source type transverter, can control independently, fast active power and reactive power, thereby improves the stability of system, suppresses the fluctuation of system frequency and voltage, improves the steady-state behaviour of synchronization AC system. Modularization multi-level converter does not need switching device directly to connect, and can obtain excellent harmonic performance and drain performance by multilevel converter, is a kind of voltage source converter topological structure that has application potential quality most in flexible DC power transmission field.
The probability breaking down in order to reduce DC line, the transmission line of existing flexible DC power transmission engineering generally adopts extra large cable or land cable to carry out the interconnected of current conversion station, but for the cost that improves DC voltage grade, saves transmission line of electricity, adopt overhead transmission line to become a kind of improvement direction. When DC power transmission line adopts when trolley line, the reasons such as thunderbolt may cause the over-voltage breakdown of overhead line structures etc., generation DC line instantaneity short trouble.
The method that can restart by quick phase shift in conventional DC transmission system detects DC line transient fault, and the fastest 1s is with interior recovery, but because difference the method for converter valve characteristic is not suitable for flexible DC power transmission system. In order to realize the fast quick-recovery of flexible DC power transmission system after DC line transient fault, first need a kind of effective detection method within the shortest time, to judge the fault type of DC line.
Utility model content
The deficiency existing for prior art, the utility model object is to provide a kind of failure detector of flexible direct current circuit, can qualitative differentiation fault be permanent fault or transient fault by failure detector, avoid converter valve to rerun in fault, reduced the damage to primary equipment.
To achieve these goals, the utility model is to realize by the following technical solutions:
The failure detector of a kind of flexible direct current circuit of the present utility model, comprise energy storage device and the controllable device being connected with energy storage device one end, the other end ground connection of energy storage device, the other end of controllable device connects flexible direct current circuit to be measured by switch or every cutter; Energy storage device comprises electric capacity and the inductance with capacitances in series, or comprises electric capacity and the resistance with capacitances in series; What controllable device adopted is switch or controlled power electronic devices; Controlled electric power electronics is drawn together multiple antiparallel series thyristors, or comprises multiple antiparallel series connection full-control type devices, or comprises the series connection full-control type device of multiple anti-paralleled diodes.
What above-mentioned full-control type device adopted is insulated gate bipolar transistor, Metal-Oxide Semiconductor field-effect transistor, integrated grid commutated thyristor or electron injection enhancement gate transistor.
The utility model is in the time that DC line moves, failure detector stored energy, maintain DC voltage at desired value, after DC line breaks down, failure detector connects with DC line to be detected and DC voltage is provided, and detects that larger DC current or DC voltage decay are very fast, thinks that fault still exists, for permanent fault, maintenance line related; As larger DC current do not detected, and think that fault disappears, converter valve puts into operation again, reduces converter valve and causes converter valve to be damaged because miscarrying in fault. This checkout gear of while does not affect straight-flow system and normally moves, and cost is low, is easy to realize, and has effectively avoided converter valve to rerun the situation in fault, has reduced the damage probability of expensive primary equipment.
Brief description of the drawings
Fig. 1 is the structural representation of failure detector of the present utility model;
Fig. 2 is the failure detector being made up of anti-parallel thyristor;
Fig. 3 is the failure detector being made up of switch;
Fig. 4 is the schematic diagram that failure detector is installed on current conversion station;
Fig. 5 is the charging method workflow diagram of DC line checkout gear of the present utility model;
Fig. 6 is the fault detection method workflow diagram of DC line checkout gear of the present utility model.
Detailed description of the invention
For technological means, creation characteristic that the utility model is realized, reach object and effect is easy to understand, below in conjunction with detailed description of the invention, further set forth the utility model.
Referring to Fig. 1, a kind of failure detector of the present utility model comprises controllable device and energy storage device.
Controllable device can be made up of switch, also can be made up of controlled power electronic devices.
Energy storage device is made up of electric capacity and inductance, and electric capacity plays energy storage effect in the utility model, and inductance plays and reduces the effect of charge and discharge initial impact, and wherein the inductance in energy storage device also can adopt resistance to replace.
Referring to Fig. 2, be a kind of failure detector being formed by multiple anti-parallel thyristors, electric capacity, inductance, in figure, IGCT schematic diagram is including but not limited to IGCT 6,7 and multiple IGCTs compositions antiparallel 6 ', 7 '. By making 6 and 7 in conducting in capacitor charging process to 2 and 4 trigger impulses, as voltage reaches setting value Udcset1, the corresponding trigger impulse of cutoff thyristor 6,7, maintains voltage stabilization. IGCT shown in Fig. 2 also can be replaced by the power electronic devices such as IGBT, IGCT.
After being connected with DC line to be detected, utmost point control protective unit or fault detection control device by 2 ', 4 ' trigger impulse IGCT 6 ', 7 ' conducting, capacitor C loads DC voltage to circuit to be measured.
Referring to Fig. 3, for a kind of failure detector being formed by switch, electric capacity, inductance, after being connected with DC line to be detected, load DC voltage by the closed capacitor C of gauge tap to circuit to be measured, the switch 10 in figure can be that alternating-current switch can be also dc switch.
Referring to Fig. 4, by failure detector 4-1, DC side switch or every cutter 4-2, converter valve 4-3, fault detect selector switch 4-4,4-5, DC voltage current measuring device 4-6,4-7, positive electrode bus, negative pole bus composition; Wherein converter valve is by A, B, tri-facies units of C, and each facies unit is made up of upper brachium pontis, upper brachium pontis reactance, lower brachium pontis, lower brachium pontis reactance, and brachium pontis is formed by N sub-module-cascade. Failure detector 1 describes as an example of the failure detector being made up of anti-parallel thyristor shown in Fig. 2 example.
When operation, failure detector is connected with anodal DC line by fault detect switch 4-4, after detecting that DC voltage current measuring device 4-6 is charged, taking failure detector shown in Fig. 2 as example, come to charge to DC capacitor by IGCT in conducting Fig. 26,7.
After DC line fault, first cut-off switch or every cutter 4-2, make DC line and current conversion station isolation, protect preliminary failure judgement circuit by utmost point control, carry out faulty line selection, as confirmed, anodal line fault needs to detect, open failure selector switch or every cutter, the fault of closing selector switch or every cutter; As confirmed, negative pole line fault needs to detect, open failure detects selector switch 4-4, fault detect selector switch 4-5 closes, after confirmation failure detector and circuit to be measured complete and are connected, trigger in Fig. 2 IGCT 6 ', 7 ', load DC voltage by energy storage on failure detector electric capacity to circuit to be detected, thereby realize the fault judgement of circuit to be detected.
Referring to Fig. 5, the charging method that the utility model is implemented DC line fault checkout gear comprises:
Step 501: by switch or every cutter, failure detector is parallel to anodal DC line, enters step 502;
Step 502: detecting after DC line operation, is energy-storage travelling wave tube capacitor charging by the controllable device of failure detector:
(i), in the time that controllable device adopts switch, in the time that capacitance voltage is less than 0.8 times of setting value Udcset1, the switch in closed controllable device is capacitor charging; In the time that capacitance voltage is greater than setting value Udcset1, disconnect the switch in controllable device, wherein Udcset1 is more than or equal to 0.6 times of DC rated voltage, and more preferably Udcset1 may be selected to be DC voltage rated value.
(ii) in the time that controllable device is made up of multiple antiparallel Thyristors in series or be composed in series by multiple antiparallel full-control type devices, the IGCT of triggering and conducting capacitor charging direction or full-control type device;
(iii), in the time that controllable device is composed in series by the full-control type device of multiple anti-paralleled diodes, the diode in controllable device is not controlled charging of electric capacity.
Referring to Fig. 6, the method that the utility model is implemented DC line fault detection comprises:
Step 601: detect after DC line protection action, enter step 602, otherwise enter step 601;
Step 602: DC line and each end converter valve are disconnected by dc switch or every cutter, enter step 603;
Step 603: wait for after the blow-out time T mset1 setting, enter step 604, wherein blow-out time T mset1 span is 1 millisecond to 30 minutes, more preferably may be selected to be 200ms;
Step 604: by controlling the controllable device of failure detector, the electric capacity in failure detector is discharged to DC line;
Step 605: whether fault of detection line: enter immediately step 607 in the time route protection action being detected, otherwise enter step 606;
Step 606: when detecting that DC line voltage is greater than Udcset2 and exceedes after setting-up time Tmset2, enter and step 608, otherwise enter step 605, wherein Udcset2 is chosen as K times of rated direct voltage, wherein 0.1 < K < 1, more preferably may be selected to be 0.9 times of rated direct voltage, wherein circuit pressure-resistant time definite value Tmset2 span is 1 millisecond to 1 minute, more preferably may be selected to be 10ms;
Step 607: stop at once testing process the permanent soft lineal system of stopping transport and being associated with DC line;
Step 608: the controllable device of controlling failure detector stops to line discharge the electric capacity in failure detector, recovers the straight-flow system operation that is associated with DC line again.
The utility model is in the time that DC line moves, failure detector stored energy, maintain DC voltage at desired value, after DC line breaks down, failure detector connects with DC line to be detected and DC voltage is provided, and detects that larger DC current or DC voltage decay are very fast, thinks that fault still exists, for permanent fault, maintenance line related; As larger DC current do not detected, and think that fault disappears, converter valve puts into operation again, reduces converter valve and causes converter valve to be damaged because miscarrying in fault. In addition, the voltage max that the utility model DC line fault detection method is added in circuit to be measured can reach rating operating voltage, the fully phenomenon such as detection line imaginary short, this checkout gear of while does not affect straight-flow system with detection method and normally moves, cost is low, be easy to realize, effectively avoided converter valve to rerun the situation in fault, reduced the damage probability of expensive primary equipment.
More than show and described general principle of the present utility model and principal character and advantage of the present utility model. The technical staff of the industry should understand; the utility model is not restricted to the described embodiments; that in above-described embodiment and description, describes just illustrates principle of the present utility model; do not departing under the prerequisite of the utility model spirit and scope; the utility model also has various changes and modifications, and these changes and improvements all fall within the scope of claimed the utility model. The claimed scope of the utility model is defined by appending claims and equivalent thereof.
Claims (2)
1. a failure detector for flexible direct current circuit, is characterized in that: comprise energy storageDevice and the controllable device being connected with energy storage device one end, another termination of described energy storage deviceGround, the other end of described controllable device connects flexible direct current circuit to be measured by switch or every cutter;
Described energy storage device comprises electric capacity and the inductance with capacitances in series, or comprise electric capacity and withThe resistance of capacitances in series;
What described controllable device adopted is switch or controlled power electronic devices;
Described controlled electric power electronics is drawn together multiple antiparallel series thyristors, or comprisesMultiple antiparallel series connection full-control type devices, or comprise that the series connection of multiple anti-paralleled diodes is completeControl type device.
2. the failure detector of flexible direct current circuit according to claim 1, its spyLevy and be: what described full-control type device adopted is insulated gate bipolar transistor, metal-oxideThing semiconductor field effect transistor, integrated grid commutated thyristor or electron injection enhancement grid crystalline substanceBody pipe.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201521076457.7U CN205246812U (en) | 2015-12-22 | 2015-12-22 | Fault detection device of flexible direct current circuit |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201521076457.7U CN205246812U (en) | 2015-12-22 | 2015-12-22 | Fault detection device of flexible direct current circuit |
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| CN205246812U true CN205246812U (en) | 2016-05-18 |
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| CN201521076457.7U Active CN205246812U (en) | 2015-12-22 | 2015-12-22 | Fault detection device of flexible direct current circuit |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107422229A (en) * | 2017-07-03 | 2017-12-01 | 广州供电局有限公司 | Transmission system fault detection method and device, computer-readable storage medium and equipment |
| CN111682510A (en) * | 2020-05-18 | 2020-09-18 | 天津大学 | First-removal and then-isolation protection method for ground fault of symmetrical unipolar direct-current microgrid |
| CN112491035A (en) * | 2020-10-26 | 2021-03-12 | 许继电气股份有限公司 | Direct current energy consumption device based on thyristor and control method thereof |
-
2015
- 2015-12-22 CN CN201521076457.7U patent/CN205246812U/en active Active
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107422229A (en) * | 2017-07-03 | 2017-12-01 | 广州供电局有限公司 | Transmission system fault detection method and device, computer-readable storage medium and equipment |
| CN107422229B (en) * | 2017-07-03 | 2019-08-16 | 广州供电局有限公司 | Transmission system fault detection method and device, computer storage medium and equipment |
| CN111682510A (en) * | 2020-05-18 | 2020-09-18 | 天津大学 | First-removal and then-isolation protection method for ground fault of symmetrical unipolar direct-current microgrid |
| CN112491035A (en) * | 2020-10-26 | 2021-03-12 | 许继电气股份有限公司 | Direct current energy consumption device based on thyristor and control method thereof |
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