CN112103929B - Phase selection and switching-off method for AC filter of same-tower double-circuit DC converter station - Google Patents
Phase selection and switching-off method for AC filter of same-tower double-circuit DC converter station Download PDFInfo
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H7/00—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions
- H02H7/26—Sectionalised protection of cable or line systems, e.g. for disconnecting a section on which a short-circuit, earth fault, or arc discharge has occured
- H02H7/268—Sectionalised protection of cable or line systems, e.g. for disconnecting a section on which a short-circuit, earth fault, or arc discharge has occured for dc systems
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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
- H02J3/01—Arrangements for reducing harmonics or ripples
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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
- Y02E40/00—Technologies for an efficient electrical power generation, transmission or distribution
- Y02E40/40—Arrangements for reducing harmonics
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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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Abstract
The invention discloses a method for switching in, selecting phases and separating gates of alternating current filters of a same-tower double-circuit direct current converter station, which comprises the following steps: step 1: designing a software logic scheme; step 2: designing a secondary loop scheme; and step 3: and corresponding the software command with a physical loop: and 4, step 4: and realizing phase selection and switching-off. When the method is adopted to carry out the filter phase selection and brake separation functions in the established direct current engineering, the networking mode of the original device is not influenced, the tripping circuit in the bus protection screen of the filter is fully utilized, only the full-cut case and the physical circuit are required to be added, and the reliability and the economical efficiency are considered at the same time.
Description
Technical Field
The invention relates to the technical field of direct current transmission, in particular to a phase selection and switching-off method for an alternating current filter of a same-tower double-circuit direct current converter station.
Background
The converter station is configured with the function of an alternating current filter: harmonic current generated by the converter is filtered and part of fundamental reactive power is provided for the converter.
The cutting mode of the alternating current filter mainly comprises the following steps: the filter is cut off manually by operators, the filter protection device acts to cut off the filter, and the measurement and control device (a double-loop coordination control host STC, a direct current station control host DCC and the like) passes through different delay cut-off filters by detecting whether voltage, idle work and the like meet fixed values or not, wherein when the alternating current voltage of a rectification station detected by the measurement and control device exceeds a maximum overvoltage fixed value, the measurement and control device can send a full cut filter command, and in order to rapidly limit the influence of overvoltage on equipment and a power grid, all filters need to be cut off in a short time after the command is sent out (each direct current project has the requirement of overvoltage full cut filter time).
The phase selection switching-on and switching-off function: the dynamic and static contacts of the circuit breaker are switched on and off at the designated phase angle of the voltage waveform of the system, so that the power equipment is switched on and off under the condition of minimum impact on the power equipment and the system, the phase selection switching-on and switching-off technology can inhibit overvoltage and impact current in the transient process of switching-on and switching-off operation of the circuit breaker, eliminate the influence and damage of transient overvoltage on the electrical equipment, prolong the service life of the equipment and improve the stability of the whole power system.
The AC filter in the converter station is cut off according to small groups under normal conditions, and all the AC filters are cut off at one time only when serious faults occur, at the moment, the DC is stopped, and the load is cut off by a generator of a power plant. The internal insulation of small group filter circuit breaker supply equipment in part of direct current converter stations is weak, and faults such as arcing and heavy breakdown occur for many times when the filters are normally switched, so that explosion of an arc extinguish chamber of the circuit breaker is caused, peripheral equipment is damaged, and the life safety of field operating personnel is threatened.
The source of the switching-off signal of the ac filter of the conventional control system includes: double-loop control or direct current station control, alternating current filter protection action and OWS manual cutting of the alternating current filter. Wherein, measurement and control devices such as double-loop control or direct current station control send out cut-all alternating current filter, RPC (reactive power control) cut-off filter instruction, and each cut-off instruction goes through the same secondary loop.
1) Under the normal condition of double-loop control STC, an opening signal of the alternating current filter is transmitted to an AFC host of a measurement and control device of the alternating current filter through a CAN network of a station, is output from an I/O board card of the AFC, is connected to a remote control opening terminal of an operation box through an alternating current filter protection screen (but is not connected to an opening loop input end of a phase selection opening and closing device), and is connected to a tripping coil of the alternating current filter. The switching-off signal is directly acted on the operation box without the phase selection switching-off function because the switching-off loop input end of the phase selection switching-off and switching-on device is not connected actually and the phase selection switching-off function is not put into use.
2) The cut signal of the AC filter sent out by the protection of the AC filter is directly sent to the switch operation box without passing through a phase selection opening and closing device.
3) And the manual cut alternating current filter signal sent by the operator workstation is sent to an AFC host of the alternating current filter measurement and control device through an SCADA network, is combined with the alternating current filter cut signal sent to the AFC by an STC or DCC through a station CAN network, and is sent to the I/O board card through CAN lines of the AFC host and the IO device for output.
For the existing alternating current filter cutting strategy of the converter station, part of converter station hardware circuits are only put into a circuit breaker phase selection switching-on circuit, and are not put into a phase selection switching-off circuit, so that the insulation in the circuit breaker supply equipment of a small group of filters in the converter station is weak, and the faults of arcing, heavy breakdown and the like can occur for many times when the filters are normally switched, so that the explosion of a circuit breaker arc extinguish chamber is caused, peripheral equipment is damaged, and the life safety of field operating personnel is threatened.
The software of the converter station is not divided into high and low priorities, the measurement and control device logically judges that the sent cut-off command goes to the same secondary loop outlet, the command which needs to cut off the filter in a short time is difficult to meet the time limit requirement after passing through the phase selection switching-off device, equipment overvoltage damage and power grid fluctuation are caused, a plurality of filter cut-off fixed values need to be set in the engineering in order to meet the time limit requirement, and direct current power transmission is limited after the filter is cut off.
Disclosure of Invention
Aiming at the defects of the prior art, the invention provides a method for switching in, selecting phases and separating gates of alternating current filters of a same-tower double-circuit direct current converter station.
The invention discloses a method for switching in, selecting phases and separating gates of alternating current filters of a same-tower double-circuit direct current converter station, which specifically comprises the following steps:
step 1: designing software logic schemes
Setting the working condition that the alternating current filter needs to be cut off quickly as a high priority, setting the rest as a low priority, wherein a high-priority cutting command does not pass through the phase selection switching-on and switching-off device, and a low-priority cutting command passes through the phase selection switching-on and switching-off device;
step 2: scheme for designing secondary loop
Corresponding to the program priority designed in the step 1, the secondary loop comprises a low-priority cut-off filter group command loop and a high-priority all cut-off command loop, and the secondary loop respectively runs through different physical loops according to the high-priority and the low-priority;
and step 3: and corresponding the software command with a physical loop:
configuring the address of the high-priority export command transfer-out communication module in the step 1, which points to the high-priority all-removal command loop in the step 2, as the board card address of the full-cutting chassis, and configuring the address of the low-priority export command transfer-out communication module in the step 1, which points to the low-priority removal filter group command loop in the step 2, as the board card address of the non-full-cutting chassis, so that the software command corresponds to the physical loop;
and 4, step 4: realizing phase selection and switching-off:
and 3, switching-off commands with high priority are not input into the phase selection switching-off function outlet, and switching-off commands with low priority are input into the phase selection switching-off function outlet, so that phase selection switching-off is realized.
According to an embodiment of the present invention, in step 1:
the low priority signal includes: 1) a Q _ MAX signal, 2) a U _ MAX _ TRIP1 signal, 3) a U _ MAX _ TRIP2 signal, 4) a U _ MAX _ TRIP3 signal, 5) a U _ MAX signal, 6) a Q _ CONTROL signal, 7) a U _ CONTROL signal, 8) a manual cut filter signal;
the high priority signal includes: 1) the dc pole all latches the all-cut filter signal, 2) the U _ MAX _ TRIP4 signal.
According to an embodiment of the present invention, in step 2:
the low-priority cut filter bank command loop is: the double-loop control screen/direct-current station control screen-alternating-current filter measurement and control screen-alternating-current filter group protection screen;
the high priority all-removal command loop is: and hard wiring connection is adopted, and a tripping loop of the bus protection screen of the alternating current filter is used for transmitting the tripping loop to the protection screen of the alternating current filter group.
According to one embodiment of the invention, the low-priority rejection filter group command loop finally passes through the phase selection switching-on/off device to the operation box, and the high-priority all-rejection command loop finally passes through the phase selection switching-on/off device and is directly sent to the operation box.
The invention has the following beneficial effects:
1. the method comprises the following steps of dividing the cut-off logic of the alternating current filter according to high and low priorities, enabling the cut-off logic to correspond to a designed secondary circuit, enabling high and low priorities to cut off signals to go through different physical circuits, and achieving the requirements of preventing arcing explosion when a switch of the filter is disconnected and fast time limit of a full cut filter;
2. the secondary circuit of the opening command is designed with two different secondary circuits according to two priorities (whether to completely cut the filter) of the opening command, the opening command with high priority is not put into the phase selection opening function outlet, the opening command with low priority is put into the phase selection opening function outlet and is matched with the alternating current filter grading cutting logic, the high priority command is ensured to be quickly output, and the low priority command is prevented from arcing explosion when the filter switch is disconnected through the phase selection opening device;
3. when the method is adopted to carry out the filter phase selection and brake separation functions in the established direct current engineering, the networking mode of the original device is not influenced, the tripping circuit in the bus protection screen of the filter is fully utilized, only the full-cut case and the physical circuit are required to be added, and the reliability and the economical efficiency are considered at the same time.
Drawings
The accompanying drawings, which are included to provide a further understanding of the application and are incorporated in and constitute a part of this application, illustrate embodiment(s) of the application and together with the description serve to explain the application and not to limit the application. In the drawings:
FIG. 1 is a signal flow diagram of the phase selection and gate separation function of an AC filter of a double-loop four-pole converter station in the embodiment;
FIG. 2 is a diagram of a secondary circuit of a newly added full-cut filter with four groups of filters in a large group of the same-tower double-circuit DC converter station in the embodiment;
fig. 3 is a diagram illustrating software commands and physical loops of a large group of newly added all-cut filters with four small groups of filters in the same-tower double-circuit dc converter station in the embodiment.
Detailed Description
In the following description, for purposes of explanation, numerous implementation details are set forth in order to provide a thorough understanding of the various embodiments of the present invention. It should be understood, however, that these implementation details are not to be interpreted as limiting the invention. That is, in some embodiments of the invention, such implementation details are not necessary. In addition, some conventional structures and components are shown in simplified schematic form in the drawings.
In addition, the descriptions related to the first, the second, etc. in the present invention are only used for description purposes, do not particularly refer to an order or sequence, and do not limit the present invention, but only distinguish components or operations described in the same technical terms, and are not understood to indicate or imply relative importance or implicitly indicate the number of indicated technical features. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one such feature. In addition, technical solutions between various embodiments may be combined with each other, but must be realized by a person skilled in the art, and when the technical solutions are contradictory or cannot be realized, such a combination should not be considered to exist, and is not within the protection scope of the present invention.
The invention relates to a method for switching in, selecting phases and separating gates of alternating current filters of a same-tower double-circuit direct current converter station, which specifically comprises the following steps of:
step 1: designing software logic schemes
Setting the working condition that the alternating current filter needs to be cut off quickly as a high priority, setting the rest as a low priority, wherein a high-priority cutting command does not pass through the phase selection switching-on and switching-off device, and a low-priority cutting command passes through the phase selection switching-on and switching-off device;
wherein the low priority signal comprises: 1) a Q _ MAX signal, 2) a U _ MAX _ TRIP1 signal, 3) a U _ MAX _ TRIP2 signal, 4) a U _ MAX _ TRIP3 signal, 5) a U _ MAX signal, 6) a Q _ CONTROL signal, 7) a U _ CONTROL signal, 8) a manual cut filter signal;
the high priority signal includes: 1) the dc pole all latches the full cut filter signal, 2) the U _ MAX _ TRIP4 signal;
step 2: scheme for designing secondary loop
Corresponding to the program priority designed in the step 1, the secondary loop comprises a low-priority cut-off filter group command loop and a high-priority all cut-off command loop, and the secondary loop respectively runs through different physical loops according to the high-priority and the low-priority;
the low-priority cut filter bank command loop is: the command circuit of the low-priority cut filter group finally passes through the phase selection switching-on and switching-off device to the operation box;
the high priority all-removal command loop is: the high-priority complete cutting command circuit is directly sent to the operation box without passing through a phase selection switching-on and switching-off device;
and step 3: and corresponding the software command with a physical loop:
configuring the address of the high-priority export command transfer-out communication module in the step 1, which points to the high-priority all-removal command loop in the step 2, as the board card address of the full-cutting chassis, and configuring the address of the low-priority export command transfer-out communication module in the step 1, which points to the low-priority removal filter group command loop in the step 2, as the board card address of the non-full-cutting chassis, so that the software command corresponds to the physical loop;
and 4, step 4: realizing phase selection and switching-off:
and 3, switching-off commands with high priority are not input into the phase selection switching-off function outlet, and switching-off commands with low priority are input into the phase selection switching-off function outlet, so that phase selection switching-off is realized.
The first embodiment is as follows:
taking a double-loop four-pole converter station as an example, the signal flow direction of the secondary loop of the alternating current filter designed in step 2 and put into the phase selection and switching-off function is shown in fig. 1: collecting the operating parameters of the converter station by a measurement and control host STC or a measurement and control host DCC in a main guide return, obtaining an instruction of cutting off a part of group filters or fully cutting the group filters through logic operation, dividing the instruction into a high priority and a low priority by the measurement and control host STC and DCC according to whether the group filters are fully cut, and sending the instruction of the high priority to an alternating current filter bus protection cabinet through a hard wiring loop after being opened by a measurement and control device, and then sending the instruction of the high priority to an operation box in each filter group protection screen through hard wiring to directly export the instruction to a switch separating brake coil; and after the low-priority command is output by the measurement and control device, the low-priority command is output to the measurement and control cabinet of the alternating current filter through a local area network CAN communication loop of the mutual communication of the host machines in the station, and then is transmitted to the protection screens of all groups of filters through hard wiring, passes through the phase selection and switching-off device and is output to the switching-off coil by the operation box.
Example two:
taking an example that one large group of the same-tower double-circuit direct current converter station is provided with four small groups of filters, secondary circuits are shown in fig. 2, wherein a circuit of a thick solid line is a high-priority full-cut filter rapid tripping circuit, a circuit of a thin solid line is a low-priority non-full-cut filter tripping circuit, the two circuits are physically and independently networked without mutual influence, the reliability is improved, especially for most converter stations without the phase selection and switching separation function, in the later transformation process, the original networking mode can not be changed, only a full-cut short backboard cabinet needs to be added under the condition that an original project does not have a redundant outlet, and the full-cut function can be realized under the condition that the full-cut time limit requirement is met by laying fewer cables.
In the figure, DCC1A and DCC1B are mutually redundant I-loop direct current station control hosts; DCC2A and DCC2B are mutually redundant II-loop direct current station control host; the STCA and the STCB are mutually redundant double-loop coordination control hosts; AFP1A and AFP1B are a first large group of filter bus protection cabinets; AFP11A and AFP11B are first large group filters and first small group filter protection cabinets; AFP12A and AFP12B are a first large group of filters and a second small group of filter protection cabinets; AFP13A and AFP13B are a first large group of filters and a third small group of filter protection cabinets; AFP124, AFP124 are a first large group of filters and a fourth small group of filter protection cabinets.
The DCC1A host is a working host, when the host sends out a full-cut command, the command is sent to a full-cut IO case in the DCC1A screen cabinet and a full-cut case in the DCC1B screen cabinet at the same time, two paths of full-cut commands are sent to the full-cut cases in the STCA and STCB screen cabinets at the same time and then sent to two sets of devices for protecting the buses of the big group of filters, trip circuits in the two sets of bus protection cabinets of the big group of filters are directly sent to operation boxes in the protection screens of the two small groups of filters for direct outlet, and two paths of trip signals do not pass through the phase selection and separating gate function, so that the time limit requirement is met. The line adopting the filter large-group bus protection screen skillfully utilizes the existing loop, and greatly reduces the engineering quantity for the reconstruction.
Software logic is based on a hardware loop, on a corresponding relation between software and hardware, a mode of configuring different addresses on a board card of a main machine full-cut case and a board card of a non-full-cut case is adopted for position identification, in a program, a high-priority outlet command is transmitted out of a communication module to be configured as an address of the board card of the full-cut case, a low-priority outlet command is transmitted out of the communication module to be configured as an address of the board card of the non-full-cut case, as shown in figure 3, the high-priority command is acquired by a measurement and control main machine DCC and STC in a field operation state and is logically operated to obtain an excising filter command, a thick solid line shows that the high-priority command is transmitted to the communication board card of the full-cut case through the communication module after being subjected to OR logic operation and then is transmitted out through an independent secondary loop, and a thin solid line shows that the low-priority command is transmitted to the communication board card of the non-full-cut case through the communication module after being subjected to OR logic operation and then is transmitted through the other loop, for the command with low priority, the phase selection separating brake loop is put in before the command is sent to the operation box, and the command with high priority is not put in.
The invention adopts a circuit breaker cutting strategy of a converter station alternating current filter: the software design is divided according to two high and low priorities of a full-cut filter and a non-full-cut filter, a high-priority command in the secondary circuit design directly exits and disconnects all group filter switches without passing through a phase selection and switching-off device, a low-priority switching-off command disconnects the group filter circuit breakers after passing through the phase selection and switching-off device, the secondary circuits are mutually independent, the full-cut aging requirement can be met while the phase selection and switching-off functions can be achieved by adding a full-cut interface to original control logic software and adding a full-cut outlet cabinet and board cards to a screen cabinet, and the method is suitable for newly built and already put into operation converter stations to conduct transformation operation.
The above description is only an embodiment of the present invention, and is not intended to limit the present invention. Various modifications and alterations to this invention will become apparent to those skilled in the art. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention should be included in the scope of the claims of the present invention.
Claims (4)
1. A phase selection and switching-off method for an alternating current filter of a same-tower double-circuit direct current converter station is characterized by comprising the following steps:
step 1: designing software logic schemes
Setting the working condition that the alternating current filter needs to be cut off quickly as a high priority, setting the rest as a low priority, wherein a high-priority cutting command does not pass through the phase selection switching-on and switching-off device, and a low-priority cutting command passes through the phase selection switching-on and switching-off device;
step 2: scheme for designing secondary loop
Corresponding to the program priority designed in the step 1, the secondary loop comprises a low-priority cut-off filter group command loop and a high-priority all cut-off command loop, and the secondary loop respectively runs through different physical loops according to the high-priority and the low-priority;
and step 3: and corresponding the software command with a physical loop:
the high-priority export command in the step 1 is transmitted out through a communication module and is directed to the address of the full-cut chassis board card in the high-priority all-removal command loop in the step 2, the low-priority export command in the step 1 is transmitted out through the communication module and is directed to the address of the non-full-cut chassis board card in the low-priority removal filter group command loop in the step 2, and the software command corresponds to the physical loop;
and 4, step 4: realizing phase selection and switching-off:
and 3, switching-off commands with high priority are not input into the phase selection switching-off function outlet, and switching-off commands with low priority are input into the phase selection switching-off function outlet, so that phase selection switching-off is realized.
2. The method for putting the AC filter of the same-tower double-circuit DC converter station into phase selection and switching off according to claim 1, wherein in the step 1:
the low priority signal includes: 1) a Q _ MAX signal, 2) a U _ MAX _ TRIP1 signal, 3) a U _ MAX _ TRIP2 signal, 4) a U _ MAX _ TRIP3 signal, 5) a U _ MAX signal, 6) a Q _ CONTROL signal, 7) a U _ CONTROL signal, 8) a manual cut filter signal;
the high priority signal includes: 1) the dc pole all latches the all-cut filter signal, 2) the U _ MAX _ TRIP4 signal.
3. The method for putting the ac filter of the same-tower double-circuit dc converter station into phase selection and switching off according to claim 1, wherein in the step 2:
the low-priority cut filter bank command loop is: the double-loop control screen/direct-current station control screen-alternating-current filter measurement and control screen-alternating-current filter group protection screen;
the high priority all-removal command loop is: and hard wiring connection is adopted, and a tripping loop of the bus protection screen of the alternating current filter is used for transmitting the tripping loop to the protection screen of the alternating current filter group.
4. The method for putting the AC filter into phase selection and separating brake of the same-tower double-circuit DC converter station as recited in claim 3, wherein the command circuit of the low-priority cut-off filter group is finally sent to the operation box through the phase selection and separation and brake device, and the command circuit of all the high-priority cut-off command circuits is finally sent to the operation box directly without passing through the phase selection and separation and brake device.
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| CN105281338A (en) * | 2015-11-06 | 2016-01-27 | 中国能源建设集团广东省电力设计研究院有限公司 | Alternating-current voltage measuring point optimization configuration method and structure for reactive power control of converter station |
| CN106053986A (en) * | 2016-06-13 | 2016-10-26 | 南方电网科学研究院有限责任公司 | Method for testing switching strategy of alternating current filter |
| CN105978015A (en) * | 2016-06-22 | 2016-09-28 | 南京南瑞继保电气有限公司 | Removing method and control apparatus for alternating current filters for high-voltage direct-current power transmission |
| CN107292764A (en) * | 2017-05-12 | 2017-10-24 | 中国南方电网有限责任公司超高压输电公司广州局 | Alternating current filter switchs the adaptive choosing method of phase selecting switching-on apparatus definite value |
| CN107179465A (en) * | 2017-07-26 | 2017-09-19 | 国家电网公司 | Extra-high voltage direct-current phase selecting switching-on apparatus performance and secondary circuit site test method |
| CN207638333U (en) * | 2017-12-05 | 2018-07-20 | 中国南方电网有限责任公司超高压输电公司广州局 | Alternating current filter cuts off circuit automatically after a kind of last line tripping |
| CN109921425A (en) * | 2019-03-29 | 2019-06-21 | 云南电网有限责任公司电力科学研究院 | A kind of alternating current filter phase selection control method and system based on converter station |
| CN111208418A (en) * | 2020-01-10 | 2020-05-29 | 中国南方电网有限责任公司超高压输电公司广州局 | Phase selection switching-on and switching-off state monitoring system and method for converter station alternating current filter |
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