CN1877948A - Method for implementing electrode isolation of super-high voltage DC system under the condition of dipolar operation and monopolar fault by using phase shifting - Google Patents
Method for implementing electrode isolation of super-high voltage DC system under the condition of dipolar operation and monopolar fault by using phase shifting Download PDFInfo
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- CN1877948A CN1877948A CN 200610085618 CN200610085618A CN1877948A CN 1877948 A CN1877948 A CN 1877948A CN 200610085618 CN200610085618 CN 200610085618 CN 200610085618 A CN200610085618 A CN 200610085618A CN 1877948 A CN1877948 A CN 1877948A
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Abstract
The invention discloses an electrode separating method of super-high pressure DC system in the double-electrode operating condition, which is characterized by the following: examining the electrode neutral bus current before the protective movement sends electrode locking and separating order after signal accident; sending the other electrode moving phase order after satisfying certain time-delay if IDNE is more than constant value (1), wherein IDNE is lateral current of neutral ground electrode lead. The invention guarantees normal operation for double electrodes, which is fit for neutral bus switch with weak arc-breaking ability.
Description
One, technical field
The present invention relates to HVDC (High Voltage Direct Current) transmission system and utilize phase shift to guarantee under the bipolar ruuning situation, the superhigh voltage DC system reliably finishes the method that the utmost point is isolated during the one pole fault, with relevant protective relaying device.
Two, background technology
HVDC (High Voltage Direct Current) transmission system is because its distinctive advantage, such as: long distance, high-power, asynchronous networking, power quick adjustment, trend controllability, the economy of transmitting electricity etc. are applied more and more widely.The core of HVDC (High Voltage Direct Current) transmission system is a high-voltage dc transmission electric control protection system, and it comprises control system and protection system.
Faults such as one pole converter, utmost point bus and the neutral line, the output of protection action require to carry out utmost point isolated operation usually except carrying out utmost point locking, to reach the purpose with faulty section and Operational Zone isolation.Under the bipolar ruuning situation, after the locking of the fault utmost point,, there is kind of a situation running current will continue to flow to the fault point, makes utmost point isolated operation be difficult to finish because the non-fault utmost point continues operation.
Under the existing bipolar ruuning situation, the superhigh voltage DC system finishes the method that the utmost point is isolated during the one pole fault, employing be the method for direct cut-off breaker.After the one pole fault here is meant this utmost point locking, the normal running current of another utmost point can continue the to flow through fault of neutral bus switch of this utmost point, such as: utmost point neutral bus earth fault.With the definition of lower monopole fault and here the explanation identical.
Under the existing bipolar ruuning situation, the superhigh voltage DC system finishes the method that the utmost point isolates and can be described below during the one pole fault:
The implication of the symbol that is adopted during description is seen figure: the implication explanation of Fig. 1 value
Among the figure, IDNE1, IDNE2 refer to the utmost point 1, the utmost point 2 neutral earthing utmost points lead-in wire side electric current respectively, NBS1, NBS2 refer to the utmost point 1, the utmost point 2 neutral switches respectively, and NBGS refers to neutral earthing switch (also claiming ground, station switch), and P1_S, P2_S refer to the utmost point 1, the utmost point 2 utmost point bus-tie circuit breakers respectively.
Under the bipolar non-equilibrium operational mode (switch (circuit breaker) P1_S, P2_S, NBS1, NBS2 are all closing the position), such as: during the utmost point 2 neutral bus continuous earth faults (F point among Fig. 1), the action of the utmost point 2 neutral bus differential protections.The result of the action is, the utmost point 2 lockings, and send the utmost point 2 utmost point isolation orders (dividing P2_S and NBS2).Because after the utmost point 2 lockings, the utmost point 1 is still in operation; Most of running current of the utmost point 1 can be from the utmost point 2 neutral bus continuous earth fault points, and just electric current is from the F point, and the NBS2 that flows through, NBS1 flow into the utmost point 1 converter.Existing utmost point partition method is direct cut-off breaker, just directly disconnects NBS2 and finishes the utmost point 2 utmost point isolation orders.If big electric current can not reliably disconnect NBS2 by NBS2, then NBS2 switch protection action.One of result of action closes ground, station switch NBGS.Shunting is to reach reliable disconnection NBS2.
Under the existing bipolar ruuning situation, the superhigh voltage DC system finishes the weak point of the utmost point partition method during one pole fault: if the dc circuit breaker current interruption is limited in one's ability, directly cut-off breaker very likely damages circuit breaker, or the circuit breaker that at all breaks not open, make another utmost point running current continue the earth fault of flowing through, thereby fault coverage is enlarged.The engineering that ground, station switch is not set is then particularly evident.
Three, summary of the invention
The objective of the invention is: provide a kind of and utilize phase shift to guarantee under the bipolar ruuning situation, the superhigh voltage DC system finishes the method that the utmost point is isolated during the one pole fault.Be particularly suitable for a little less than the utmost point neutral bus switch current interruption ability, and the situation that ground, station switch engineering is not set.When utilizing phase shift to guarantee bipolar ruuning situation during the one pole fault superhigh voltage DC system finish the method that the utmost point is isolated, it is characterized in that:
During bipolar operational mode, before utmost point locking and utmost point isolation order are sent in the protection action after the one pole fault, check this utmost point neutral bus electric current.If
IDNE＞definite value (1)
Then, satisfy certain time-delay after, send another Ghandler motion phase command.
In the formula, IDNE refers to neutral earthing utmost point lead-in wire side electric current.
Obviously, another Ghandler motion mutually after, will not have another utmost point running current to flow through this utmost point neutral bus switch.Because the one pole fault exists, then utmost point locking and utmost point isolation order are sent in the protection of the fault utmost point.Fault extremely can be finished the utmost point reliably and isolate.The fault utmost point perfects Ghandler motion and removes mutually after finishing utmost point isolation, continues transmission power.
Fig. 2 shows and typically utilizes phase shift to guarantee under the bipolar ruuning situation, finishes the realization block diagram that the utmost point is isolated during the one pole fault.Especially satisfy certain time-delay and after monostable, send another Ghandler motion phase command again.Monostable implication is: when being input as true time, output is true at once and keeps the set time, is false thereafter, no matter be input as the length of really holding time.Keeping the length of set time can set.
Characteristics of the present invention:
The present invention utilizes phase shift to guarantee under the bipolar ruuning situation, and the superhigh voltage DC system finishes the method that the utmost point is isolated during the one pole fault, be particularly suitable for a little less than the utmost point neutral bus switch current interruption ability, and the situation that ground, station switch engineering is not set.
Four, description of drawings
Fig. 1 by the present invention calculate the implication explanation of use value
Fig. 2 finishes the realization block diagram that the utmost point is isolated when utilizing phase shift to guarantee bipolar operation troubles for the present invention
Five, embodiment
Read bipolar running status, the protection detect one pole fault, calculating (1) formula, utilize the realization block diagram of Fig. 2, obtain the phase shift order of another utmost point and remove the phase shift order.Fig. 2 finishes the realization block diagram that the utmost point is isolated when utilizing phase shift to guarantee bipolar operation troubles, among Fig. 2, satisfies certain time-delay and send another Ghandler motion phase command again after monostable.Monostable implication is: when being input as true time, output is true at once and keeps the set time, is false thereafter, no matter be input as the length of really holding time.Keeping the length of set time can set.
Definite value is selected reference: definite value is about 0.05 times of dc rated current in the formula (1), and time-delay is about 180ms.The length of keeping the set time can be set (tens to hundreds of ms), is about 200ms as the monostable time.
Claims (3)
- When 1, utilizing phase shift to guarantee bipolar ruuning situation during the one pole fault superhigh voltage DC system finish the method that the utmost point is isolated, it is characterized in that:During bipolar operational mode, before utmost point locking and utmost point isolation order are sent in the protection action after the one pole fault, check this utmost point neutral bus electric current; If IDNE＞definite value (1)Then, satisfy certain time-delay after, send another Ghandler motion phase command;In the formula, IDNE refers to neutral earthing utmost point lead-in wire side electric current.
- When 2, utilizing phase shift to guarantee bipolar ruuning situation by claim 1 is described during the one pole fault superhigh voltage DC system finish the method that the utmost point is isolated, it is characterized in that: satisfy certain time-delay and after monostable, send another Ghandler motion phase command again.
- When 3, utilizing phase shift to guarantee bipolar ruuning situation by claim 1 is described during the one pole fault superhigh voltage DC system finish the method that the utmost point is isolated, it is characterized in that: definite value is about 0.05 times of dc rated current in the formula (1), time-delay is about 180ms, and the monostable time is about 200ms.
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| Application Number | Priority Date | Filing Date | Title |
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| CNB2006100856188A CN100492801C (en) | 2006-06-28 | 2006-06-28 | Method for implementing electrode isolation of super-high voltage DC system |
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| CNB2006100856188A CN100492801C (en) | 2006-06-28 | 2006-06-28 | Method for implementing electrode isolation of super-high voltage DC system |
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| CN1877948A true CN1877948A (en) | 2006-12-13 |
| CN100492801C CN100492801C (en) | 2009-05-27 |
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102088186A (en) * | 2009-12-02 | 2011-06-08 | 南京南瑞继保电气有限公司 | Method for carrying out failure protection and logic optimization on UHVDC (Ultra-High Voltage Direct Current) neutral bus switch |
| CN101854056B (en) * | 2009-12-02 | 2012-07-25 | 南京南瑞继保电气有限公司 | Neutral bus switch protection health pole action strategy and counting shutdown method thereof |
| CN105470923A (en) * | 2015-12-31 | 2016-04-06 | 国家电网公司 | Method for increasing current converter protection region for extra-high voltage converter station |
| CN105576615A (en) * | 2015-12-31 | 2016-05-11 | 国家电网公司 | Neutral bus switch failure (NBSF) logic verification method |
| CN107735917A (en) * | 2015-03-30 | 2018-02-23 | 通用电器技术有限公司 | Converter |
| CN109066813A (en) * | 2018-08-27 | 2018-12-21 | 广西大学 | Direct current single-stage based on alternating current-direct current full model is latched earth current control method for coordinating |
-
2006
- 2006-06-28 CN CNB2006100856188A patent/CN100492801C/en active Active
Cited By (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102088186A (en) * | 2009-12-02 | 2011-06-08 | 南京南瑞继保电气有限公司 | Method for carrying out failure protection and logic optimization on UHVDC (Ultra-High Voltage Direct Current) neutral bus switch |
| CN101854056B (en) * | 2009-12-02 | 2012-07-25 | 南京南瑞继保电气有限公司 | Neutral bus switch protection health pole action strategy and counting shutdown method thereof |
| CN107735917A (en) * | 2015-03-30 | 2018-02-23 | 通用电器技术有限公司 | Converter |
| US10447028B2 (en) | 2015-03-30 | 2019-10-15 | General Electric Technology Gmbh | Bipole voltage source converter and control and operation thereof |
| CN105470923A (en) * | 2015-12-31 | 2016-04-06 | 国家电网公司 | Method for increasing current converter protection region for extra-high voltage converter station |
| CN105576615A (en) * | 2015-12-31 | 2016-05-11 | 国家电网公司 | Neutral bus switch failure (NBSF) logic verification method |
| CN105470923B (en) * | 2015-12-31 | 2018-05-15 | 国家电网公司 | Increase the method in ultra-high voltage converter station converter unit protection region |
| CN105576615B (en) * | 2015-12-31 | 2018-08-03 | 国家电网公司 | A kind of method of NBSF logic checkings |
| CN109066813A (en) * | 2018-08-27 | 2018-12-21 | 广西大学 | Direct current single-stage based on alternating current-direct current full model is latched earth current control method for coordinating |
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| CN100492801C (en) | 2009-05-27 |
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