CN107171353B - Light control valve control method for preventing current from being unable to be established during direct current unlocking - Google Patents

Light control valve control method for preventing current from being unable to be established during direct current unlocking Download PDF

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Publication number
CN107171353B
CN107171353B CN201710452951.6A CN201710452951A CN107171353B CN 107171353 B CN107171353 B CN 107171353B CN 201710452951 A CN201710452951 A CN 201710452951A CN 107171353 B CN107171353 B CN 107171353B
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valve
station
trigger
degrees
valves
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CN107171353A (en
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黄义隆
李晋伟
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Maintenance and Test Center of Extra High Voltage Power Transmission Co
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Maintenance and Test Center of Extra High Voltage Power Transmission Co
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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
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
    • H02M1/00—Details of apparatus for conversion
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
    • H02M1/00—Details of apparatus for conversion
    • H02M1/08—Circuits specially adapted for the generation of control voltages for semiconductor devices incorporated in static converters
    • H02M1/088—Circuits specially adapted for the generation of control voltages for semiconductor devices incorporated in static converters for the simultaneous control of series or parallel connected semiconductor devices
    • H02M1/092—Circuits specially adapted for the generation of control voltages for semiconductor devices incorporated in static converters for the simultaneous control of series or parallel connected semiconductor devices the control signals being transmitted optically
    • 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]

Abstract

The invention discloses a light control valve control method for preventing current from being incapable of being established during direct current unlocking, which comprises the following steps in one power supply period: step 1, sequentially sending trigger control signals at intervals of 30 degrees for valves from No. 1 to No. 12 of the rectification station and the inversion station respectively; step 2, setting the corresponding time of the initial value of the trigger angle of the inverter station as T1Time of day, T1The time corresponds to 0 degree, T of the No. 1 valve trigger control cycle1At any moment, triggering pulse is sent to the No. 1 valve of the inverter station; step 3, when detecting that the valve which is not conducted bears the forward voltage again, reissuing a trigger pulse to the valve which is not conducted; and 4, step 4: at TNThe trigger pulse T is generated for each valve of the inversion stationN＝T1+ (N-1)30 degrees. By adding the complementary pulse logic every 30 degrees in the inverter station, the invention prolongs the through-flow time of the converter valve, improves the probability of simultaneous conduction of the rectifier station and the inverter station converter valve, and improves the availability and reliability of the direct current engineering.

Description

Light control valve control method for preventing current from being unable to be established during direct current unlocking
Technical Field
The invention belongs to the technical field of power electronics and power systems, and particularly relates to a light control valve control method for preventing current from being incapable of being established during direct-current unlocking.
Background
The high-voltage direct-current engineering twelve-pulse converter valve receives periodic trigger pulses sent by the valve control equipment, and twelve single valves are sequentially conducted in sequence to realize alternating current and direct current conversion. When the converter valve normally operates, each period of twelve single valves receives a trigger control signal, the trigger control signals received by the single valves have a 30-degree difference, and on the rising edge of each trigger control signal, the corresponding single valve bears forward voltage, and after the valve control equipment receives a forward voltage establishment signal sent by the converter valves, the valve control equipment sends out trigger pulses to transfer the current of the original conduction valve to the next conduction valve, so that the phase conversion process between the two converter valves is realized. In the process of direct current unlocking, direct current cannot be established by adopting a normally-operated trigger pulse mode, a pulse supplementing strategy is adopted in the current direct current engineering, a first trigger pulse is sent out on the rising edge of a trigger control signal, because other converter valves are not conducted at the moment, phase conversion between the two converter valves cannot be carried out, the converter valves cannot be stably conducted, the two ends of the converter valves bear forward voltage again, valve control equipment receives the forward voltage and then supplements the trigger pulse, and generally speaking, when the direct current voltage difference between the two stations is large enough, the direct current can be established.
However, in the actual dc operation process, the above-mentioned valve-controlled pulse-supplementing strategy may have the situation that the dc current is established for several seconds or cannot be established for a long time, which causes dc blocking, and affects the availability and reliability of the dc engineering.
Disclosure of Invention
Aiming at the defects of the prior art, the invention aims to provide a light control valve control method for preventing the current from being incapable of being established during the direct current unlocking period, and solves the problems that the current valve control pulse supplementing strategy is incapable of simultaneously conducting two converter valves and the direct current cannot be established for a long time due to the fact that the detection valve forward voltage supplementing pulse has certain randomness and the light control valve supplementing pulse frequency is limited by the optical power.
In order to achieve the purpose, the invention adopts the following technical scheme:
a light control valve control method for preventing current from being incapable of being established during direct current unlocking is used for a direct current unlocking process of a twelve-pulse converter valve direct current transmission system, and comprises the following steps in one power supply period:
step 1, sequentially sending trigger control signals to valves from No. 1 to No. 12 of a rectification station at intervals of 30 degrees, and sequentially sending trigger control signals to valves from No. 1 to No. 12 of an inversion station at intervals of 30 degrees;
step 2, setting the corresponding time of the initial value of the trigger angle of the inverter station as T1Time of day, T1The time corresponds to 0 degree of the No. 1 valve trigger control period at T1At the moment, triggering pulses are sent to the No. 1 valve of the inverter station and the No. 1 valve of the rectifier station at TmTrigger pulse is sent out to No. m valves in rectification station and inversion station respectively constantly, wherein: t ism＝T130 degrees, m is more than or equal to 2 and less than or equal to 12, and m is a natural number;
step 3, if detecting that one valve of the valves from No. 1 to No. 12 of the rectifier station and the valves from No. 1 to No. 12 of the inverter station is not conducted, when detecting that the valve which is not conducted bears forward voltage again, supplementing a trigger pulse to the valve which is not conducted;
and 4, step 4: at TNConstantly to every valve complement trigger pulse of contravariant station, wherein: t isN＝T1N-1 is 30 degrees, N is more than or equal to 2 and less than or equal to 4, and N is a natural number.
Preferably, the initial value of the firing angle of the inverter station is 135 degrees.
Compared with the prior art, the invention has the beneficial effects that: in the high-voltage direct-current unlocking process, the complementary pulse logic at intervals of 30 degrees is added in the inverter station, the rectifier station is not added, the number of complementary pulses is added at fixed intervals, the through-flow time of the converter valve is prolonged, the probability of simultaneous conduction of the rectifier station and the converter valve of the inverter station is improved, the condition that direct current is locked due to the fact that the direct current is established for several seconds or cannot be established for a long time in the prior art is avoided, and the availability and reliability of direct current engineering are greatly improved.
Drawings
Fig. 1 is a schematic structural view of a No. 1 to No. 12 valve of an inverter station in a light control valve control method for preventing current from being unable to be established during direct current unlocking according to the present invention;
FIG. 2 is a schematic flow chart of a method for controlling a light control valve to prevent current from failing to build during DC unlocking according to the present invention;
fig. 3 is a schematic diagram of valve trigger pulses from inverter station nos. 1 to 2 according to an embodiment of a light control method for preventing current from being unable to be established during dc unlocking.
Detailed Description
For a better understanding of the present invention, the present invention will be further described below with reference to the accompanying drawings, but embodiments of the present invention are not limited thereto.
A light control valve control method for preventing current from being incapable of being established during direct current unlocking is used for a direct current unlocking process of a twelve-pulse converter valve direct current transmission system, and comprises the following steps in one power supply cycle, as shown in figure 2:
s1: the valves from No. 1 to No. 12 of the rectification station are sequentially spaced by 30 degrees to send out trigger control signals, the valves from No. 1 to No. 12 of the inversion station are also sequentially spaced by 30 degrees to send out trigger control signals, and each trigger control signal is maintained at 120 degrees;
s2: setting the corresponding time of the initial value of the trigger angle of the inverter station as the time T1, setting the time T1 to correspond to 0 degree of the trigger control period of the No. 1 valve, sending trigger pulses to the No. 1 valve of the inverter station and the No. 1 valve of the rectifier station at the time T1, and respectively sending trigger pulses to the No. m valve of the rectifier station and the No. m valve of the inverter station at the time Tm, wherein: tm is T1+ (m-1)30 degrees, m is more than or equal to 2 and less than or equal to 12, and m is a natural number;
s3: preferably, the initial value of the trigger angle of the inverter station is 135 degrees of the power supply cycle;
s4: if detecting that one valve of the valves from No. 1 to No. 12 of the rectifying station and the valves from No. 1 to No. 12 of the inverter station is not conducted, when detecting that the valve which is not conducted bears forward voltage again, supplementing a trigger pulse to the valve which is not conducted;
s5: at TNConstantly to every valve complement trigger pulse of contravariant station, wherein: t isN＝T1N-1 is 30 degrees, N is more than or equal to 2 and less than or equal to 4, and N is a natural number.
Example (b):
the structural schematic diagram of the inverter station valves from No. 1 to No. 12 is shown in FIG. 1, the original pulse supplementing logic of the converter valves is maintained, the twelve-pulse converter valves are sequentially switched on at intervals of 30 degrees, that is, the trigger control signals of the inverter station valves from No. 1 to No. 12 are sequentially switched on at intervals of 30 degrees, trigger pulses are generated on the rising edges of the trigger control signals, if the converter valves cannot be switched on for the first time, after the fact that the valves bear forward voltages again is detected, the trigger pulses are correspondingly supplemented in the trigger control periods of the valves.
The pulse supplementing logic every 30 degrees is added in the inverter station, the schematic diagram of the triggering pulse of the No. 1 to No. 2 valves is shown in FIG. 3, the T1 carries out pulse supplementing on the No. 1 valve at the moment, the triggering pulse is supplemented at the corresponding moments of 30, 60, 90 and 120 degrees in the No. 1 valve triggering control period (120 degrees), the moments are exactly the moments corresponding to the first conduction of other No. 2, No. 3, No. 4 and No. 5 valves, the current flowing through the converter valve is suddenly increased when the valve is conducted each time, then the current is gradually decreased, the current flowing through the converter valve can be prolonged to a certain extent by increasing the number of the pulse supplementing at fixed intervals, and the probability of simultaneous conduction of the converter valves of the rectifier station and the inverter station is improved.
Because the time for the converter valve of the inverter station to bear the forward voltage in the trigger control period is much shorter than that of the rectifier station, generally, the time for the converter valve of the inverter station to bear the forward voltage in the trigger control period is 180- α (α is a trigger angle), the larger the α is, the shorter the time for the converter valve to bear the forward voltage is, the too small α affects the stability of the system, generally not less than 120 degrees, in order to match with a pulse supplementing logic every 30 degrees, the time for the converter valve to bear the forward voltage in the trigger control period is prolonged, preferably, the trigger angle of the inverter station during unlocking is optimized to 135 degrees from about 150 degrees as an initial value, thus, when the power supply period is 135 degrees, the trigger pulse is sent to the valve No. 1, when the pulse supplementing time is carried out to the valve No. 1 forcibly, the forward voltage is borne by the valve No. 1, the current conversion time is prolonged, and the probability of simultaneous conduction of the converter valve of the rectifier station.
It is to be understood that the invention is not limited to the examples described above, but that modifications and variations may be effected thereto by those of ordinary skill in the art in light of the foregoing description, and that all such modifications and variations are intended to be within the scope of the invention as defined by the appended claims.

Claims (2)

1. A light control valve control method for preventing current from being incapable of being established during direct current unlocking is used for a direct current unlocking process of a twelve-pulse converter valve direct current transmission system, and is characterized by comprising the following steps in one power supply period:
step 1, sequentially sending trigger control signals to valves from No. 1 to No. 12 of a rectification station at intervals of 30 degrees, and sequentially sending trigger control signals to valves from No. 1 to No. 12 of an inversion station at intervals of 30 degrees;
step 2, setting the corresponding time of the initial value of the trigger angle of the inverter station as T1Time of day, T1The time corresponds to 0 degree of the No. 1 valve trigger control period at T1At the moment, triggering pulses are sent to the No. 1 valve of the inverter station and the No. 1 valve of the rectifier station at TmTrigger pulse is sent out to No. m valves in rectification station and inversion station respectively constantly, wherein: t ism＝T130 degrees, m is more than or equal to 2 and less than or equal to 12, and m is a natural number;
step 3, if detecting that one valve of the valves from No. 1 to No. 12 of the rectifier station and the valves from No. 1 to No. 12 of the inverter station is not conducted, when detecting that the valve which is not conducted bears forward voltage again, supplementing a trigger pulse to the valve which is not conducted;
and 4, step 4: at TNConstantly to every valve complement trigger pulse of contravariant station, wherein: t isN＝T1N-1 is 30 degrees, N is more than or equal to 2 and less than or equal to 4, and N is a natural number.
2. The light control valve control method for preventing the current from being unable to be established during the direct current unlocking according to claim 1, wherein the initial value of the firing angle of the inverter station is 135 degrees.
CN201710452951.6A 2017-06-15 2017-06-15 Light control valve control method for preventing current from being unable to be established during direct current unlocking Active CN107171353B (en)

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CN109149914A (en) * 2018-07-09 2019-01-04 南方电网科学研究院有限责任公司 A kind of valve base electronic device reissues pulse method
CN113472222B (en) * 2021-05-26 2022-06-14 南方电网科学研究院有限责任公司 Complementary pulse control method for thyristor

Citations (4)

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Publication number Priority date Publication date Assignee Title
DE3221831A1 (en) * 1981-06-16 1983-01-05 Mitsubishi Electric Corp Thyristor arrangement
CN101187690A (en) * 2007-11-28 2008-05-28 中国电力科学研究院 DC converter valve restoration period transient forward voltage test method
CN104092232A (en) * 2014-06-26 2014-10-08 国家电网公司 Automatic locking method for battery replacement station of flexible direct-current transmission system
CN106526418A (en) * 2016-11-04 2017-03-22 中国南方电网有限责任公司超高压输电公司检修试验中心 Closed-loop control system of converter valve trigger circuit of conventional high-voltage direct-current power transmission system, and control method and fault positioning method thereof

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3221831A1 (en) * 1981-06-16 1983-01-05 Mitsubishi Electric Corp Thyristor arrangement
CN101187690A (en) * 2007-11-28 2008-05-28 中国电力科学研究院 DC converter valve restoration period transient forward voltage test method
CN104092232A (en) * 2014-06-26 2014-10-08 国家电网公司 Automatic locking method for battery replacement station of flexible direct-current transmission system
CN106526418A (en) * 2016-11-04 2017-03-22 中国南方电网有限责任公司超高压输电公司检修试验中心 Closed-loop control system of converter valve trigger circuit of conventional high-voltage direct-current power transmission system, and control method and fault positioning method thereof

Non-Patent Citations (1)

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Title
天广直流换流阀异常导通EMTDC仿真分析;黄义隆等;《电力系统保护与控制》;20170201;第45卷(第3期);全文 *

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