CN105548871A - MMC sub-module bypass switch state detection device and MMC sub-module bypass switch - Google Patents
MMC sub-module bypass switch state detection device and MMC sub-module bypass switch Download PDFInfo
- Publication number
- CN105548871A CN105548871A CN201510903459.7A CN201510903459A CN105548871A CN 105548871 A CN105548871 A CN 105548871A CN 201510903459 A CN201510903459 A CN 201510903459A CN 105548871 A CN105548871 A CN 105548871A
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- CN
- China
- Prior art keywords
- auxiliary contact
- state
- pass switch
- main contacts
- bypass switch
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- 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.)
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Classifications
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
- G01R31/327—Testing of circuit interrupters, switches or circuit-breakers
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
- H01H9/00—Details of switching devices, not covered by groups H01H1/00 - H01H7/00
Abstract
The invention relates to an MMC sub-module bypass switch state detection device and an MMC sub-module bypass switch. The MMC sub-module bypass switch comprises a control coil, a main contact and an auxiliary contact. The two ends of the auxiliary contact are each provided with a port for accessing a power supply. The bypass switch further comprises a detection module, and the detection module includes a detection branch which is used for detecting the state of the auxiliary contact and determining the state of the main contact according to the state of the auxiliary contact. When the control coil is energized or de-energized, the states of the main contact and the auxiliary contact of the bypass switch correspondingly change. As there is a corresponding relation between the state of the main contact and the state of the auxiliary contact, the state of the main contact can be determined by detecting the on-off state of the auxiliary contact. The detection device is simple and practicable. With the detection device, the state of the bypass switch can be detected accurately and quickly.
Description
Technical field
The present invention relates to the state-detection of MMC submodule by-pass switch, be specifically related to MMC submodule by-pass switch condition checkout gear and MMC submodule by-pass switch.
Background technology
In modular multi-level flexible direct-current transmission system, flexible direct current transmission converter valve as nucleus equipment, by the mode of multiple sub module cascade is connected.Wherein, each submodule is equipped with a by-pass switch, and when certain sub-module fault, by-pass switch closed pair fault submodule carries out bypass, and therefore, by-pass switch is the critical component that in flexible direct current transmission converter valve does not conform to or lacks.
Conventional switch all only has two states: turn off or conducting, is alternatively to open or close.Generally, by-pass switch is a main contacts, the control coil of this main contacts of MMC controller control linkage, when needing to bypass submodule corresponding to this main contacts, the control coil that controller controls this main contacts obtains electric, and now this main contacts closes, and realizes the bypass of submodule.As shown in Figure 1, be the by-pass switch control circuit of routine, comprise: adhesive line bag M, main contacts K and auxiliary contact S, when in controller control adhesive line bag, no current flows through, main contacts K disconnects, and auxiliary contact S is corresponding disconnection also; When controller controls have electric current to flow through in adhesive line bag M, main contacts K closes, correspondingly auxiliary contact S also corresponding disconnection, realizes disconnecting and closed two states.
But when converter valve stable operation, if bypass tripping appears in certain fault submodule, fault submodule can not bypass in time, and possible causing trouble is extended to whole system, causes more serious destruction; If there is other switch malfunction, and when quantity is more, redundancy submodule can be caused to exhaust and make whole system out of service.
In the ordinary course of things, by-pass switch occurs that the reason of tripping or malfunction is: fault has appearred in control coil or other devices, and by-pass switch itself breaks down hardly.
Therefore, antithetical phrase module bypass switch carries out state and detects quickly and accurately, seems very crucial and necessary.But condition detection method or device not for MMC submodule by-pass switch in prior art.
Summary of the invention
The object of this invention is to provide a kind of MMC submodule by-pass switch condition checkout gear, for carrying out the detection of state to by-pass switch.The present invention provides a kind of MMC submodule by-pass switch simultaneously.
For achieving the above object, the solution of the present invention comprises a kind of MMC submodule by-pass switch condition checkout gear, and there is the port for accessing power supply at the two ends of auxiliary contact; Described condition checkout gear comprises detection module, and described detection module comprises detection branch, and described detection branch, for detecting the state of auxiliary contact, determines the state of main contacts according to the state of auxiliary contact.
Described detection module also comprises a processor, and described processor sampling connects described detection branch, and described detection branch is in parallel with described auxiliary contact.
Described detection branch comprises an optocoupler, and the former limit of described optocoupler connects the two ends of described auxiliary contact, and described processor sampling connects the secondary of described optocoupler.
The former limit of described optocoupler is parallel with a filter capacitor, and described auxiliary contact inverse parallel has a diode.
The two ends of described auxiliary contact connect by-pass switch power supply.
A kind of MMC submodule by-pass switch, comprise control coil, main contacts and auxiliary contact, there is the port for accessing power supply at the two ends of auxiliary contact; Described by-pass switch also comprises a detection module, and described detection module comprises detection branch, and described detection branch, for detecting the state of auxiliary contact, determines the state of main contacts according to the state of auxiliary contact.
Described detection module also comprises a processor, and described processor sampling connects described detection branch, and described detection branch is in parallel with described auxiliary contact.
Described detection branch comprises an optocoupler, and the former limit of described optocoupler connects the two ends of described auxiliary contact, and described processor sampling connects the secondary of described optocoupler.
The former limit of described optocoupler is parallel with a filter capacitor, and described auxiliary contact inverse parallel has a diode.
The two ends of described auxiliary contact connect by-pass switch power supply.
When control coil obtains electric or dead electricity, all can there is corresponding change in the state of by-pass switch main contacts and auxiliary contact, owing to having corresponding relation between the state of auxiliary contact and the state of main contacts, so, the state of this main contacts can be determined by the state of cut-offfing detecting these auxiliary contact, this pick-up unit is simple, and can complete accurately, rapidly the detection of by-pass switch state.
Accompanying drawing explanation
Fig. 1 is MMC submodule by-pass switch structural representation;
Fig. 2 is MMC submodule by-pass switch condition checkout gear structural representation.
Embodiment
Below in conjunction with accompanying drawing, the present invention will be further described in detail.
Pick-up unit embodiment
The state of the by-pass switch of MMC submodule to comprise point, closes two states, because by-pass switch is the main contacts of a control coil, so the state of by-pass switch also can be called the state of by-pass switch main contacts K or main contacts K.
When detecting the state of main contacts K, because direct to detect this main contacts has very large difficulty, and not easily realize.In the present invention, one indirectly detection mode is provided, is determined the state of this main contacts by the state of auxiliary contact.
When main contacts state changes, the state of auxiliary contact also changes thereupon, and the state of cut-offfing realized by detecting these auxiliary contact detects or determines the state of this main contacts.
In addition, after the state obtaining main contacts K, the bypass switch control signal sent with MMC controller compares, and can also judge whether main contacts is tripping or malfunction.Such as: when the state obtaining main contacts K is conducting, if the bypass switch control signal that MMC controller sends is conducting, show that now by-pass switch does not break down, if the bypass switch control signal that MMC controller sends, for turning off, so shows that the fault of malfunction has appearred in by-pass switch; For another example: when the state obtaining main contacts K is shutoff, if the bypass switch control signal that MMC controller sends is for turning off, show that now by-pass switch does not break down, if the bypass switch control signal that MMC controller sends is conducting, so show that the fault of tripping has appearred in by-pass switch.
Pick-up unit as shown in Figure 2, the state of auxiliary contact S and the state one_to_one corresponding of by-pass switch main contacts K.When in adhesive line bag M, no current flows through, main contacts K disconnects, and auxiliary contact S is normally open; When having electric current to flow through in adhesive line bag M, this adhesive line bag M can produce certain electromagnetic force, and this electromagnetic force can make main contacts K close, and now auxiliary contact S also becomes normally off from normally open.So the state of auxiliary contact S is identical with the state of main contacts K, and the state of auxiliary contact S changes along with the change of the state of main contacts K.Therefore, the state of by-pass switch main contacts K can be judged by the state detecting by-pass switch auxiliary contact S.
This pick-up unit also comprises the testing circuit of the state of a detection auxiliary contact S, and this circuit comprises high pressure photoelectrical coupler OPT1, pull-up resistor R1, current-limiting resistance R2, filter capacitor C1, anti-paralleled diode D1, pull-up resistor R3.
As shown in Figure 2, in order to power conveniently, the two ends of auxiliary contact S connect by-pass switch power supply.In the both positive and negative polarity supply line of by-pass switch power supply, string is provided with pull-up resistor R1 and auxiliary contact S successively, these auxiliary contact S is in parallel with a detection line, this detection line is gone here and there successively the light emitting diode that is provided with in current-limiting resistance R2 and high pressure photoelectrical coupler OPT1, this light emitting diode is in parallel with filter capacitor C1, these these auxiliary contact S also with diode D1 reverse parallel connection.The both positive and negative polarity supply line controlling power supply goes here and there successively the phototriode that is provided with in pull-up resistor R3 and coupling mechanism OPT1, tie point DIN1 between phototriode and pull-up resistor R3 is the state-detection point of auxiliary contact S, determined the state of auxiliary contact S by the current potential detecting this DIN1 point, and then obtain the state of main contacts K.
In this testing circuit, the effect of each composition device is respectively: pull-up resistor R1: under auxiliary contact disconnection, makes optocoupler diode be in logic high, improves antijamming capability, sends out simultaneously and play metering function when optical diode conducting.Current-limiting resistance R2: LED current is flow through in restriction.Filter capacitor C1: form RC filter circuit with resistance R2, improves circuit anti-interference ability.Anti-paralleled diode D1: prevent outside reverse voltage to damage light emitting diode.Pull-up resistor R3: optocoupler phototriode is that OC exports, and by pull-up, by-pass switch state-detection point is clamped at high level.The signal using photoelectric coupled device OPT1 to achieve between forceful electric power and light current is isolated, and has good electrical isolation capabilities and antijamming capability.
This pick-up unit is in use: because main contacts K is identical with the state of auxiliary contact S, and auxiliary contact S changes along with the change of the state of main contacts K, so, when by-pass switch main contacts K disconnects, auxiliary contact S is also off state, now by-pass switch power supply and pull-up resistor R1, the light emitting diode of current-limiting resistance R2 and optocoupler forms current return, light pipe LED lighting, phototriode conducting, by-pass switch state-detection point DIN1 is pulled low to low level, controller is that low level show that auxiliary contact S is off state according to check point DIN1, and then show that main contacts K is off state.
When by-pass switch main contacts K closes, auxiliary contact S becomes normally off, now auxiliary contact are by resistance R2 and optocoupler light-emitting diodes tube short circuit, optocoupler light emitting diode no current flows through, light emitting diode is not luminous, the non-conducting of phototriode, and by-pass switch state-detection point DIN1 is high level, controller is that high level show that auxiliary contact S is closure state according to check point DIN1, and then show that main contacts K is closure state.
Controller, by detecting the logic level of DIN1 point, completes by-pass switch auxiliary contact S state-detection, because by-pass switch auxiliary contact S is identical with main contacts K state, and then can realize the detection to by-pass switch state.
The same with above-mentioned detection method, after the state obtaining main contacts K, the bypass switch control signal sent with MMC controller compares, and can also judge whether main contacts is tripping or malfunction.
A kind of particular circuit configurations of testing circuit is given in above-described embodiment, this is one of them embodiment of the present invention, as other embodiment, testing circuit only can also establish a resistance by string, the state of these auxiliary contact is determined by detecting ohmically magnitude of voltage or current value, such as: when by-pass switch main contacts K disconnects, auxiliary contact S is also off state, this resistance flows through electric current, according to this resistance having flowed through electric current or resistance two ends have voltage determination auxiliary contact to be off state, when the K conducting of by-pass switch main contacts, auxiliary contact S is also conducting state, this resistance is shorted, according to this resistance not flowing through electric current or resistance two ends do not have voltage determination auxiliary contact to be conducting state.Or, a detection control device is only set, is carried out the state of these auxiliary contact of direct-detection by house software program.In addition, detection module can also be a pilot lamp in parallel with auxiliary contact, and when auxiliary contact conducting, pilot lamp is shorted, and does not work; When auxiliary contact turn off, pilot lamp two ends are energized, bright.By detecting the bright of pilot lamp or not working, obtain the state of auxiliary contact.
In above-described embodiment, detection line is in parallel with auxiliary contact, as other embodiment, when detection line is connected with auxiliary contact, also can detect the state of auxiliary contact, such as, detect and whether this detection line flow through electric current to detect auxiliary contact whether conducting.
By-pass switch embodiment
By-pass switch comprises control coil, main contacts and auxiliary contact, also comprises the pick-up unit in above-described embodiment, owing to being all described in detail control coil, main contacts, auxiliary contact and pick-up unit in above-described embodiment, repeats no more here.
Be presented above concrete embodiment, but the present invention is not limited to described embodiment.Basic ideas of the present invention are above-mentioned basic scheme, and for those of ordinary skill in the art, according to instruction of the present invention, designing the model of various distortion, formula, parameter does not need to spend creative work.The change carried out embodiment without departing from the principles and spirit of the present invention, amendment, replacement and modification still fall within the scope of protection of the present invention.
Claims (10)
1. a MMC submodule by-pass switch condition checkout gear, is characterized in that, there is the port for accessing power supply at the two ends of auxiliary contact; Described condition checkout gear comprises detection module, and described detection module comprises detection branch, and described detection branch, for detecting the state of auxiliary contact, determines the state of main contacts according to the state of auxiliary contact.
2. MMC submodule by-pass switch condition checkout gear according to claim 1, it is characterized in that, described detection module also comprises a processor, and described processor sampling connects described detection branch, and described detection branch is in parallel with described auxiliary contact.
3. MMC submodule by-pass switch condition checkout gear according to claim 2, it is characterized in that, described detection branch comprises an optocoupler, and the former limit of described optocoupler connects the two ends of described auxiliary contact, and described processor sampling connects the secondary of described optocoupler.
4. MMC submodule by-pass switch condition checkout gear according to claim 3, is characterized in that, the former limit of described optocoupler is parallel with a filter capacitor, and described auxiliary contact inverse parallel has a diode.
5. MMC submodule by-pass switch condition checkout gear according to claim 1, is characterized in that, the two ends of described auxiliary contact connect by-pass switch power supply.
6. a MMC submodule by-pass switch, comprises control coil, main contacts and auxiliary contact, it is characterized in that, there is the port for accessing power supply at the two ends of auxiliary contact; Described by-pass switch also comprises a detection module, and described detection module comprises detection branch, and described detection branch, for detecting the state of auxiliary contact, determines the state of main contacts according to the state of auxiliary contact.
7. MMC submodule by-pass switch according to claim 6, is characterized in that, described detection module also comprises a processor, and described processor sampling connects described detection branch, and described detection branch is in parallel with described auxiliary contact.
8. MMC submodule by-pass switch according to claim 7, is characterized in that, described detection branch comprises an optocoupler, and the former limit of described optocoupler connects the two ends of described auxiliary contact, and described processor sampling connects the secondary of described optocoupler.
9. MMC submodule by-pass switch according to claim 8, is characterized in that, the former limit of described optocoupler is parallel with a filter capacitor, and described auxiliary contact inverse parallel has a diode.
10. MMC submodule by-pass switch according to claim 6, is characterized in that, the two ends of described auxiliary contact connect by-pass switch power supply.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510903459.7A CN105548871A (en) | 2015-12-09 | 2015-12-09 | MMC sub-module bypass switch state detection device and MMC sub-module bypass switch |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201510903459.7A CN105548871A (en) | 2015-12-09 | 2015-12-09 | MMC sub-module bypass switch state detection device and MMC sub-module bypass switch |
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| CN105548871A true CN105548871A (en) | 2016-05-04 |
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| CN201510903459.7A Pending CN105548871A (en) | 2015-12-09 | 2015-12-09 | MMC sub-module bypass switch state detection device and MMC sub-module bypass switch |
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Cited By (6)
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| CN107957547A (en) * | 2017-11-27 | 2018-04-24 | 深圳市英威腾电气股份有限公司 | A kind of D.C. contactor detecting system |
| CN109391131A (en) * | 2018-10-12 | 2019-02-26 | 许继集团有限公司 | A kind of submodule of MMC valve by-pass switch driving device |
| CN109672265A (en) * | 2019-03-01 | 2019-04-23 | 深圳供电局有限公司 | Automatically controlled bus connection switch driving device and its control method |
| CN110137902A (en) * | 2019-06-14 | 2019-08-16 | 中国南方电网有限责任公司超高压输电公司天生桥局 | One kind prevents flexible direct current power module by-pass switch from refusing combined floodgate circuit and method |
| CN110808606A (en) * | 2019-12-09 | 2020-02-18 | 南方电网科学研究院有限责任公司 | Power module overvoltage prevention circuit of flexible direct current transmission and converter valve |
| CN113381595A (en) * | 2020-02-25 | 2021-09-10 | 南京南瑞继保电气有限公司 | MMC sub-module and bypass protection method thereof |
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Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN109391131A (en) * | 2018-10-12 | 2019-02-26 | 许继集团有限公司 | A kind of submodule of MMC valve by-pass switch driving device |
| CN109391131B (en) * | 2018-10-12 | 2021-01-19 | 许继集团有限公司 | MMC valve submodule bypass switch driving device |
| CN109672265A (en) * | 2019-03-01 | 2019-04-23 | 深圳供电局有限公司 | Automatically controlled bus connection switch driving device and its control method |
| CN110137902A (en) * | 2019-06-14 | 2019-08-16 | 中国南方电网有限责任公司超高压输电公司天生桥局 | One kind prevents flexible direct current power module by-pass switch from refusing combined floodgate circuit and method |
| CN110808606A (en) * | 2019-12-09 | 2020-02-18 | 南方电网科学研究院有限责任公司 | Power module overvoltage prevention circuit of flexible direct current transmission and converter valve |
| CN110808606B (en) * | 2019-12-09 | 2023-10-20 | 南方电网科学研究院有限责任公司 | Overvoltage protection circuit for power module of flexible direct current transmission and converter valve |
| CN113381595A (en) * | 2020-02-25 | 2021-09-10 | 南京南瑞继保电气有限公司 | MMC sub-module and bypass protection method thereof |
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Application publication date: 20160504 |