CN108199402B - commutation failure fault recovery method for direct-current power transmission system - Google Patents
commutation failure fault recovery method for direct-current power transmission system Download PDFInfo
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- CN108199402B CN108199402B CN201711295612.8A CN201711295612A CN108199402B CN 108199402 B CN108199402 B CN 108199402B CN 201711295612 A CN201711295612 A CN 201711295612A CN 108199402 B CN108199402 B CN 108199402B
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J3/00—Circuit arrangements for ac mains or ac distribution networks
- H02J3/36—Arrangements for transfer of electric power between ac networks via a high-tension dc link
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
- Y02E60/60—Arrangements for transfer of electric power between AC networks or generators via a high voltage DC link [HVCD]
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y04—INFORMATION OR COMMUNICATION TECHNOLOGIES HAVING AN IMPACT ON OTHER TECHNOLOGY AREAS
- Y04S—SYSTEMS INTEGRATING TECHNOLOGIES RELATED TO POWER NETWORK OPERATION, COMMUNICATION OR INFORMATION TECHNOLOGIES FOR IMPROVING THE ELECTRICAL POWER GENERATION, TRANSMISSION, DISTRIBUTION, MANAGEMENT OR USAGE, i.e. SMART GRIDS
- Y04S10/00—Systems supporting electrical power generation, transmission or distribution
- Y04S10/50—Systems or methods supporting the power network operation or management, involving a certain degree of interaction with the load-side end user applications
- Y04S10/52—Outage or fault management, e.g. fault detection or location
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Abstract
the invention discloses a method for recovering commutation failure faults of a direct-current power transmission system, which comprises the following steps: step 1, collecting direct current voltage and direct current of a direct current transmission system and alternating current voltage of an alternating current power grid connected with an inverter converter station; step 2, judging whether the direct current power transmission system has a commutation failure fault according to the analog quantity acquired in the step 1; step 3, if a commutation failure fault occurs, controlling the rectification converter station to increase a trigger angle, controlling the inversion converter station to trip off the direct-current circuit breaker, and starting timing by a commutation failure time accumulator of the inversion converter station and accumulating commutation failure time; when the set time is waited for or the commutation failure fault is eliminated within a certain time, the rectification converter station is controlled to reduce the trigger angle, the inversion converter station is controlled to close the direct current breaker again, the direct current power is tried to be recovered to the level before the fault, and meanwhile, the commutation failure time accumulator of the inversion converter station is cleared. The method can effectively process the commutation failure fault of the direct current transmission system, and avoids the situation that the safety and stability of the connected alternating current power grid are endangered by the back-and-forth fluctuation of power caused by the continuous direct current commutation failure.
Description
Technical Field
the invention belongs to the field of direct-current power transmission, and particularly relates to a method for recovering commutation failure of a direct-current power transmission system.
background
The thyristor-based power grid commutation high-voltage direct-current power transmission system has the advantages of large power transmission capacity, low line manufacturing cost, strong asynchronous networking capacity, long-distance large-capacity power transmission, large-area networking and the like. The direct-current transmission system is connected to an alternating-current power grid in a large density mode, so that mutual influence among alternating-current and direct-current systems is increasingly complex, and great challenge is brought to safe and stable operation of the power grid. Commutation failure faults of a high-power direct-current system are common and are mostly caused by receiving-end alternating-current system faults. During the phase change failure, the direct current power is greatly reduced, the synchronous generator of the direct current sending end power grid is accelerated, the frequency of the direct current receiving end power grid is reduced, if the phase change failure duration is short, the direct current power can be quickly recovered, the influence on the stable operation of the system is small, but the influence on the stability of the system caused by the continuous phase change failure is serious, and the repeated impact of the continuous phase change failure can cause the instability of the relative power angle of a sending end unit and the disconnection of important alternating current connection sections.
there are many reasons for the failure of commutation failure, but when the thyristor and its trigger system both work normally, the main reason for the commutation failure is the grid voltage drop or fluctuation caused when the receiving end grid fails. The first commutation failure of direct current transmission is generally difficult to avoid, but the continuous commutation failure of direct current transmission can be inhibited by adopting proper control measures. For an alternating current-direct current hybrid power grid, continuous and repeated phase change failure can cause locking of a direct current system, interruption of power transmission of the direct current system, severe change and even reversal of transmission power of an alternating current system, impact on the alternating current system and cause protection misoperation of the alternating current system for multiple times, and seriously threatens safe and stable operation of the power grid. Therefore, the research on a proper control method has great significance for inhibiting the continuous commutation failure of direct current transmission, shortening the fault recovery time and improving the fault recovery characteristic of an alternating current-direct current system.
At present, research results on a direct-current transmission commutation failure prediction control strategy are concentrated on preventing the first commutation failure of direct-current transmission, and few documents are used for researching the suppression of continuous commutation failure of direct-current transmission. In the current direct current transmission engineering application and the published patent, commutation failure is mainly suppressed by optimizing a direct current transmission control strategy, and in a high-voltage direct current control system, a CFPREV (commutation failure prediction control) always prevents commutation failure caused by single-phase earth fault and three-phase short-circuit fault of an alternating current system by detecting zero-sequence components in commutation voltage or performing alpha/beta conversion on commutation phase voltage. Aiming at the prediction and prevention control of commutation failure, researchers provide various improved prediction algorithms, including a method for improving the detection speed and accuracy near a zero crossing point, and the adoption of self-adaptive fuzzy control or PI control to cope with the influence of different direct current control modes and operation conditions, wherein the majority of direct current control algorithms are to increase the turn-off angle or reduce direct current, and can be used as an auxiliary prevention means of commutation failure, but the continuous occurrence of commutation failure cannot be fundamentally avoided.
therefore, the method for recovering the commutation failure of the direct-current power transmission system can effectively process the commutation failure of the direct-current power transmission system under the condition that a converter is not locked, avoids the situation that the stability and the safety of a connected alternating-current power grid are endangered by the back-and-forth fluctuation of power caused by continuous direct-current commutation failure, realizes rapid direct-current power recovery after the failure disappears, and better maintains the stability of the alternating-current and direct-current power transmission system.
Disclosure of Invention
in order to solve the problems, the invention provides a method for recovering the commutation failure of the direct-current power transmission system, which is applied to a conventional direct-current power transmission system, can effectively process the commutation failure of the direct-current power transmission system under the condition that a converter is not locked, avoids the situation that the back-and-forth fluctuation of direct-current power endangers the safety and stability of a connected alternating-current power grid, realizes rapid direct-current power recovery after the failure disappears, and better maintains the stability of the alternating-current and direct-current power transmission system.
In order to achieve the technical purpose and achieve the technical effect, the invention is realized by the following technical scheme:
A method for recovering a commutation failure fault of a direct current power transmission system is characterized by comprising the following steps:
step 1, collecting direct current voltage and direct current of a direct current transmission system and alternating current voltage of an alternating current power grid connected with an inverter converter station;
step 2, judging whether the direct current power transmission system has a commutation failure fault according to the analog quantity acquired in the step 1;
step 3, if a commutation failure fault occurs, controlling the rectification converter station to increase a trigger angle, controlling the inversion converter station to trip off the direct-current circuit breaker, and starting timing by a commutation failure time accumulator of the inversion converter station and accumulating commutation failure time; when the set time is waited for or the commutation failure fault is eliminated within a certain time, the rectification converter station is controlled to reduce the trigger angle, the inversion converter station is controlled to close the direct current breaker again, the direct current power is tried to be recovered to the level before the fault, and meanwhile, the commutation failure time accumulator of the inversion converter station is cleared.
in the above scheme, when at least one of the following conditions is satisfied, it is determined that a commutation failure fault occurs in the dc power transmission system:
1) the direct current voltage is less than a first voltage fixed value Uset1 and the duration time exceeds a first detection time fixed value Tset 1;
2) the direct current is greater than a first current fixed value Iset1 and the duration time exceeds a second detection time fixed value Tset 2;
3) the rate of change of the direct voltage is less than the first rate set DUset and the duration exceeds the third detection time set Tset 3;
4) the rate of change of the direct current is greater than the second rate set, DIset, and the duration exceeds the fourth detection time set, Tset 4;
5) the alternating voltage of an alternating current power grid connected with the inversion converter station is smaller than a second voltage fixed value Uset2, and the duration time exceeds a fifth detection time fixed value Tset 5;
In the above scheme, when at least one of the following conditions is satisfied, it is determined that the commutation failure fault of the dc power transmission system disappears:
a) the error between the direct current and the direct current command before the fault is smaller than a second current fixed value Iset2, and the duration time exceeds a sixth detection time fixed value Tset 6;
b) the alternating voltage of an alternating current power grid connected with the inversion converter station is continuously greater than a third voltage fixed value Uset3, and the duration time exceeds a seventh detection time fixed value Tset 7;
in the above scheme, the phase change failure fault being eliminated within a certain time means that when the inverter converter station determines that the phase change failure fault occurs in the dc power transmission system, the phase change failure time accumulator of the inverter converter station starts timing and accumulates the phase change failure time, and when the accumulated phase change failure time does not reach a time fixed value, the phase change failure fault of the dc power transmission system is eliminated.
in the above scheme, when the accumulated commutation failure time reaches a time fixed value, blocking direct current and clearing the commutation failure time accumulator of the inverter converter station, and simultaneously sending a direct current blocking signal to the safety and stability control device, the safety and stability control device executes a corresponding tripping or load shedding control command.
the invention has the beneficial effects that:
1) the method can effectively inhibit the continuous commutation failure of the direct current transmission and shorten the fault recovery time.
2) the method can effectively process the commutation failure fault of the direct current transmission system under the condition that the converter is not locked, avoids the situation that the stability and the safety of the connected alternating current power grid are endangered by the power fluctuation caused by the continuous direct current commutation failure, realizes the rapid direct current power recovery after the fault disappears, and better maintains the stability of the alternating current and direct current transmission system.
Drawings
Fig. 1 is a diagram of a high voltage bipolar dc transmission system of the present invention;
FIG. 2 is a flow chart of a method for recovering from a commutation failure of a DC power transmission system in accordance with the present invention;
Detailed Description
the present invention will be better understood and implemented by those skilled in the art by the following detailed description of the technical solution of the present invention with reference to the accompanying drawings and specific examples, which are not intended to limit the present invention.
for a bipolar dc transmission system as shown in fig. 1, comprising: rectification current conversion station and contravariant current conversion station, both link to each other through two direct current transmission line, wherein: the rectification converter station is used for converting three-phase alternating current of a sending end alternating current power grid into direct current and then transmitting the direct current to the inversion converter station through the direct current transmission line, and the inversion converter station is used for converting the direct current into three-phase alternating current and then transmitting the three-phase alternating current to a receiving end alternating current power grid. The bus of the station entering of the sending end or receiving end AC power grid can be connected with a passive filter or not, and the passive filter or the reactive compensation capacitor is determined according to system engineering conditions. In fig. 1, a rectification converter station and an inversion converter station are formed by connecting two groups of thyristor converter units in series, the serial node of the rectification converter station and the inversion converter station is connected with a grounding electrode, and the positive end and the negative end of the serial connection are connected with a direct-current transmission line through a smoothing reactor and a direct-current short-circuit device; and a DC filter is arranged between the DC line and the ground.
The thyristor converter unit adopts a twelve-pulse bridge circuit; each bridge arm is formed by connecting a plurality of thyristors in series, the thyristor converter is connected with a transmitting end or a receiving end alternating current power grid through a three-winding transformer with a wiring mode of Y0/Y/delta, and the primary side of the transformer is provided with an alternating current circuit breaker. The transformer can carry out voltage grade conversion on three-phase alternating current of a transmitting end or receiving end alternating current system so as to adapt to a required direct current voltage grade, and the difference of the secondary side wiring modes of the transformer is that an upper six-pulse converter bridge and a lower six-pulse converter bridge of the twelve-pulse bridge thyristor converter provide three-phase alternating current with a phase angle difference of 30 degrees so as to reduce harmonic current flowing into a power grid. Generally, a constant direct current control strategy is adopted for controlling a rectification converter station, and a constant direct current control strategy is adopted for controlling an inversion converter station.
For the dc power transmission system shown in fig. 1, a commutation failure fault recovery process is shown in fig. 2, which specifically includes the following steps:
step 1, collecting direct current voltage and direct current of a direct current transmission system and alternating current voltage of an alternating current power grid connected with an inverter converter station;
Judging that the direct current transmission system has a commutation failure fault when at least one of the following conditions is met:
1) the direct current voltage is less than a first voltage fixed value Uset1 and the duration time exceeds a first detection time fixed value Tset 1;
2) the direct current is greater than a first current fixed value Iset1 and the duration time exceeds a second detection time fixed value Tset 2;
3) The rate of change of the direct voltage is less than the first rate set DUset and the duration exceeds the third detection time set Tset 3;
4) The rate of change of the direct current is greater than the second rate set, DIset, and the duration exceeds the fourth detection time set, Tset 4;
5) the alternating voltage of an alternating current power grid connected with the inversion converter station is smaller than a second voltage fixed value Uset2, and the duration time exceeds a fifth detection time fixed value Tset 5;
In the above scheme, when at least one of the following conditions is satisfied, it is determined that the commutation failure fault of the dc power transmission system disappears:
a) the error between the direct current and the direct current command before the fault is smaller than a second current fixed value Iset2, and the duration time exceeds a sixth detection time fixed value Tset 6;
b) the alternating voltage of an alternating current power grid connected with the inversion converter station is continuously greater than a third voltage fixed value Uset3, and the duration time exceeds a seventh detection time fixed value Tset 7;
The Tset 1-Tset 7, Iset1, Iset2, Uset1, Uset2, Uset3, dump and DIset values of different direct current transmission systems are different according to different circuit performance parameters, and some value ranges are provided as follows:
the time constant values Tset1 to Tset7 all range from 0 s to 1s, the direct current constant values Iset1 and Iset2 range from Ki times the rated direct current, wherein 0< Ki is less than or equal to 3, the direct voltage constant value Uset1 range from Ku1 times the rated direct voltage, wherein 0< Ku1 is less than or equal to 1, the alternating voltage constant values Uset2 and Uset3 range from Ku2 times the rated alternating voltage, wherein 0< Ku2 is less than or equal to 1, the DUset range from-10 pu/ms to-0.001 pu/ms, and the DIset range from 0.001pu/ms to 5.0 pu/ms.
step 2, judging whether the direct current power transmission system has a commutation failure fault according to the analog quantity acquired in the step 1;
Step 3, if a commutation failure fault occurs, controlling the rectification converter station to increase a trigger angle, inhibiting a fault direct current, simultaneously controlling the inversion converter station to trip off a direct current breaker, and simultaneously starting timing by a commutation failure time accumulator of the inversion converter station and accumulating commutation failure time; when the preset waiting time is up or when the inversion converter station judges that the direct current transmission system has the commutation failure fault, the commutation failure time accumulator of the inversion converter station starts to time and accumulates the commutation failure time, when the accumulated commutation failure time does not reach a time fixed value and the commutation failure fault of the direct current transmission system disappears, the rectification converter station is controlled to reduce the trigger angle, the inversion converter station is controlled to close the direct current circuit breaker again, the direct current power is tried to be restored to the level before the fault, and meanwhile, the commutation failure time accumulator of the inversion converter station is cleared.
In the above scheme, when the accumulated commutation failure time reaches a time fixed value, the direct current transmission system is locked, the commutation failure time accumulator of the inversion converter station is cleared, a direct current transmission system locking signal is sent to the safety and stability control device, and the safety and stability control device executes a corresponding generator tripping or load shedding control command.
The invention has the beneficial effects that:
1) the method can effectively inhibit the continuous commutation failure of the direct current transmission and shorten the fault recovery time.
2) the method can effectively process the commutation failure fault of the direct current transmission system under the condition that the converter is not locked, avoids the situation that the stability and the safety of the connected alternating current power grid are endangered by the power fluctuation caused by the continuous direct current commutation failure, realizes the rapid direct current power recovery after the fault disappears, and better maintains the stability of the alternating current and direct current transmission system.
the above description is only a preferred embodiment of the present invention, and not intended to limit the scope of the present invention, and all modifications of equivalent structures and equivalent processes, which are made by using the contents of the present specification and the accompanying drawings, or directly or indirectly applied to other related technical fields, are included in the scope of the present invention.
Claims (4)
1. A method for recovering a commutation failure fault of a direct current power transmission system is characterized by comprising the following steps:
Step 1, collecting direct current voltage and direct current of a direct current transmission system and alternating current voltage of an alternating current power grid connected with an inverter converter station;
Step 2, judging whether the direct current power transmission system has a commutation failure fault according to the analog quantity acquired in the step 1;
step 3, if a commutation failure fault occurs, controlling the rectification converter station to increase a trigger angle, controlling the inversion converter station to trip off the direct-current circuit breaker, and starting timing by a commutation failure time accumulator of the inversion converter station and accumulating commutation failure time; when the set time is waited for or the commutation failure fault disappears within a certain time, controlling the rectification converter station to reduce the trigger angle, controlling the inversion converter station to close the direct current breaker again, trying to recover the direct current power to the level before the fault, and clearing the commutation failure time accumulator of the inversion converter station;
the phase change failure fault is eliminated within a certain time, namely when the inversion converter station judges that the phase change failure fault occurs in the direct current transmission system, the phase change failure time accumulator of the inversion converter station starts to time and accumulates phase change failure time, and when the accumulated phase change failure time does not reach a time fixed value, the phase change failure fault of the direct current transmission system disappears.
2. the method according to claim 1, wherein the method comprises the steps of,
Judging that the direct current transmission system has a commutation failure fault when at least one of the following conditions is met:
1) The direct current voltage is less than a first voltage fixed value Uset1 and the duration time exceeds a first detection time fixed value Tset 1;
2) The direct current is greater than a first current fixed value Iset1 and the duration time exceeds a second detection time fixed value Tset 2;
3) The rate of change of the direct voltage is less than the first rate set DUset and the duration exceeds the third detection time set Tset 3;
4) The rate of change of the direct current is greater than the second rate set, DIset, and the duration exceeds the fourth detection time set, Tset 4;
5) the alternating voltage of an alternating current power grid connected with the inversion converter station is smaller than a second voltage fixed value Uset2, and the duration time exceeds a fifth detection time fixed value Tset 5.
3. The method according to claim 1, wherein the method comprises the steps of,
Judging that the commutation failure fault of the direct-current power transmission system disappears when at least one of the following conditions is met:
a) the error between the direct current and the direct current command before the fault is smaller than a second current fixed value Iset2, and the duration time exceeds a sixth detection time fixed value Tset 6;
b) The alternating voltage of the alternating current power grid connected with the inversion converter station is continuously greater than the third voltage fixed value Uset3, and the duration time exceeds the seventh detection time fixed value Tset 7.
4. The method according to claim 1, wherein the method comprises the steps of,
when the accumulated commutation failure time reaches a time fixed value, blocking direct current, resetting a commutation failure time accumulator of the inversion converter station, simultaneously sending a direct current blocking signal to the safety and stability control device, and executing a corresponding generator tripping or load shedding control command by the safety and stability control device.
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| CN109586267B (en) * | 2018-10-23 | 2021-10-12 | 中国电力科学研究院有限公司 | Load emergency control power grid simulation method and device for coping with direct current blocking |
| CN110233489B (en) * | 2019-04-26 | 2020-12-18 | 国网浙江省电力有限公司电力科学研究院 | Direct current system commutation failure recovery control method and control system |
| CN111044938B (en) * | 2019-12-20 | 2021-11-16 | 许继集团有限公司 | Alternating current section power loss detection method and device |
| CN114156931B (en) * | 2020-09-07 | 2023-11-17 | 国网江苏省电力有限公司 | Control method for inhibiting commutation failure based on hybrid cascade direct current transmission system |
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