CN109103917B - Method and device for processing high-frequency component of flexible direct-current power transmission system - Google Patents
Method and device for processing high-frequency component of flexible direct-current power transmission system Download PDFInfo
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- CN109103917B CN109103917B CN201811144839.7A CN201811144839A CN109103917B CN 109103917 B CN109103917 B CN 109103917B CN 201811144839 A CN201811144839 A CN 201811144839A CN 109103917 B CN109103917 B CN 109103917B
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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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- 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
- H02J3/38—Arrangements for parallely feeding a single network by two or more generators, converters or transformers
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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
- H02J2003/365—Reducing harmonics or oscillations in HVDC
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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
- H02J3/38—Arrangements for parallely feeding a single network by two or more generators, converters or transformers
- H02J3/388—Islanding, i.e. disconnection of local power supply from the network
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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 and a device for processing high-frequency components by a flexible direct current transmission system. The method and the device for processing the high-frequency component of the flexible direct-current transmission system provided by the invention can be used for avoiding permanent locking of the flexible direct-current transmission system when the high-frequency component occurs, particularly locking tripping in a networking-to-islanding process.
Description
Technical Field
The invention relates to the technical field of flexible direct current transmission of a power system, in particular to a method and a device for processing high-frequency components by a flexible direct current transmission system.
Background
The flexible direct current transmission system adopts a voltage source type converter, and can independently and quickly control the active power and the reactive power of the system, so that the stability of the system is improved, the fluctuation of the frequency and the voltage of the system is inhibited, and the steady-state performance of the alternating current system is improved.
With the development of the flexible direct-current transmission technology, flexible direct-current transmission systems are increasingly used in new energy grid connection, urban power supply, island power supply, power grid interconnection and other occasions. Along with the use of flexible direct current transmission system engineering at home and abroad, the stability problem caused by the converter is gradually highlighted, and reports on different types of oscillation phenomena are increased. In summary of oscillation phenomenon analysis and control methods of flexible direct current transmission systems, such as smart qi, Xixiao Rong and the like, oscillation phenomena of a plurality of flexible direct current transmission systems at home and abroad are mentioned, and particularly, in a period of switching from networking operation to island operation, a converter station in a Zhoushan five-terminal direct current transmission project has high-frequency component tripping operation to damage user equipment; when a flexible direct current converter station at one end of Luxi direct current engineering is connected to an alternating current power grid through a weak power grid, high-frequency oscillation of about 1.2kHz occurs, and the system is shut down. An anti-aliasing active damping control strategy adaptable to a wide frequency band, such as sun-silk and Zhai, proposes a virtual resistor active damping control with lead compensation to suppress high frequency components.
The universities, scientific research institutions and the like at home and abroad are analyzed from the aspect of stability, but impedance scanning, system modeling and the like cannot be completely consistent with the field, so that the high-frequency component inhibition measure is not effectively applied to the field of the flexible and straight engineering, and particularly, in the process of networking the flexible and straight system to the island, a completely effective measure does not exist, and the influence of the high-frequency component on the system and equipment is inhibited.
Therefore, a method for reliably processing a high-frequency component by a flexible direct-current transmission system is needed to be found, the high-frequency component occurring in the operation process of the flexible direct-current transmission system is effectively detected, equipment is effectively protected, the flexible direct-current transmission system is prevented from being permanently locked, and the safe and stable operation of the flexible direct-current transmission system is realized.
Disclosure of Invention
The invention aims to provide a method for reliably processing high-frequency components of a flexible direct-current transmission system aiming at the defects of the prior art, so that the high-frequency components occurring in the operation process of the flexible direct-current transmission system are effectively detected, equipment is effectively protected, the permanent locking of the flexible direct-current transmission system is avoided, and the safe and stable operation of the flexible direct-current transmission system is realized.
In order to achieve the purpose, the invention adopts the technical scheme that: a method for processing high-frequency component of flexible DC transmission system, converter station of flexible DC transmission system possesses two kinds of networking and isolated islandIn operation, the method configures high frequency component detection logic; when the flexible direct current transmission converter station works in an island operation mode for a time longer than a set time TdelayThen, if the high-frequency component detection logic detects the high-frequency component, the converter station is directly and permanently locked and tripped;
when the flexible direct current transmission converter station works in the networking operation mode or the island operation mode, the set time T is not exceededdelayWhen the high-frequency component is detected by the high-frequency component detection logic, the converter valve is temporarily locked for a period of time Tb(ii) a During the temporary locking of the converter valve, detecting the network side voltage of the flexible direct current transmission converter station, and judging whether an alternating current power supply exists in an alternating current system; after the temporary locking of the converter valve is finished, if an alternating current power supply exists in the alternating current system, the flexible direct current transmission converter station is set to work in a networking operation mode, and when the alternating current power supply does not exist in the alternating current system, the flexible direct current transmission converter station is set to work in an island operation mode; if the flexible direct-current transmission converter station works in the networking operation mode or the island operation mode without exceeding the set time T after the temporary locking converter valve is finisheddelayThen in the subsequent operation process at the set time TrunDetecting the high-frequency component again, wherein the frequency of the detected high-frequency component is greater than a set value, and permanently locking and tripping the converter station; if the time of the flexible direct-current transmission converter station working in an island operation mode after the temporary locking converter valve is finished is longer than the set time TdelayThen in the subsequent operation process at the set time TrunAnd the high frequency component is detected again, the converter station is directly permanently locked out and tripped.
The scheme specifically comprises the following steps:
(1) judging the running state of the flexible direct current transmission converter station, and if the time of working in an island running mode is more than the set time TdelayThen, executing the step (2); if the working in the networking operation mode or the island operation mode does not exceed the set time TdelayIf yes, executing the step (3);
(2) the time of working in an island operation mode is more than TdelayIf the high-frequency component is detected by the high-frequency component detection logic, the converter station is directly and permanently locked and jumpedThe brake is not used for executing the following steps, otherwise, the high-frequency component detection is continued;
(3) working in a networking operation mode or an island operation mode does not exceed the time TdelayIf the high-frequency component is detected by the high-frequency component detection logic, adding 1 to a counter, and executing the step (4), otherwise, continuing to detect the high-frequency component;
(4) temporarily blocking the converter valve for a period of time TbDetecting the network side voltage of the flexible direct current transmission converter station during the temporary locking of the converter valve, judging whether an alternating current system has an alternating current power supply, and then executing the step (5);
(5) after the temporary locking of the converter valve is finished, if an alternating current power supply exists in the alternating current system, the flexible direct current transmission converter station maintains the original operation mode, and the step (7) is executed; if the alternating current system has no alternating current power supply, the flexible direct current transmission converter station is switched to be operated in an isolated island mode, and the step (6) is executed;
(6) the operation state judgment unit judges the time of the converter station working in the island operation mode, and if the island operation time exceeds TdelayTurning to the step (2), if the island operation time does not exceed TdelayIf yes, executing step (7);
(7) if the subsequent operation is in progress, the set time T isrunIf the high-frequency component is detected again, executing the step (8), otherwise, executing the step (9);
(8) adding 1 to the counter, when the value of the counter is greater than a set value N, permanently locking and tripping the converter station, and not executing the following steps, and when the value of the counter is less than or equal to N, executing the step (4) again;
(9) if the subsequent operation time TrunIf no high frequency component is detected in the counter, resetting the counter and executing the step (1) again.
In the above scheme, the set time TrunThe value range is as follows: t isrun≥10ms。
In the foregoing solution, the high frequency component detection logic includes the following steps:
(21) detecting the maximum absolute value of the three-phase voltage in a period;
(22) if the maximum absolute value | U of a phase voltage in a periodpeak|≥Upeak_setJudging the frequency of the frequency through a zero crossing point; if the maximum absolute value | U of a phase voltage in a periodpeak|＜Upeak_setJudging that the phase voltage frequency is a reference frequency; wherein, Upeak_setIs a voltage threshold;
(23) when the frequency of any two phases in the three-phase voltage is greater than the frequency set value fsetAnd continues for a set time thfdelayThe high frequency component is determined to be present.
In the above scheme, the set time thfdelayThe value range is as follows: t is thfdelay＞5ms。
In the above scheme, the temporary locking converter valve refers to temporarily locking all bridge arms of the whole converter valve, and the temporary locking time t isb＞5ms。
In the scheme, the counter suspends counting statistics on the detection result of the high-frequency component detection logic during the temporary locking of the converter valve, and the maximum set value N output by the counter is more than or equal to 2.
In the above scheme, the specific method for judging whether the ac system has the ac power supply includes: if the net side voltage effective value UsrmsGreater than a voltage set value UsetI.e. Usrms＞UsetIf so, judging that the alternating current system has the alternating current power supply, otherwise, judging that the alternating current system does not have the alternating current power supply.
The invention also provides a device for processing the high-frequency component by the flexible direct-current power transmission system, which comprises the following components:
the operation state judgment unit is used for judging the operation state of the converter station and judging whether an alternating current power supply exists in the alternating current system;
the high-frequency component detection unit is used for detecting the high-frequency component of the converter station in real time;
the high-frequency component detection result counting unit is used for counting the detection result of the high-frequency component detection unit and judging the result;
the converter station outlet unit carries out action processing according to the output results of the operation state judging unit, the high-frequency component detecting unit and the high-frequency component detecting result counting unit, and the action result comprises: temporarily locking the converter valve, permanently locking the converter valve and tripping;
and the calling unit is used for calling each unit to perform related processing.
In the above scheme, the calling unit calls the operation state judgment unit, and the operation state judgment unit judges that the time of the flexible direct current transmission converter station working in the island operation mode is greater than the set time TdelayThen, if the high-frequency component detection unit detects the high-frequency component, the calling unit calls a converter station outlet unit to enable the converter station to be directly and permanently locked and tripped;
the operation state judgment unit judges that the flexible direct current transmission converter station works in the networking operation mode or the island operation mode not to exceed the set time TdelayIf the high-frequency component detection unit detects the high-frequency component, the calling unit calls the converter station outlet unit to temporarily lock the converter valve for a period of time Tb(ii) a During the temporary locking of the converter valve, the operation state judgment unit detects the network side voltage of the flexible direct current transmission converter station and judges whether an alternating current power supply exists in the alternating current system, after the temporary locking of the converter valve is finished, if the alternating current power supply exists in the alternating current system, the flexible direct current transmission converter station is set to work in a networking operation mode, and when the alternating current system does not have the alternating current power supply, the flexible direct current transmission converter station is set to work in an island operation mode; if the flexible direct-current transmission converter station works in the networking operation mode or the island operation mode without exceeding the set time T after the temporary locking converter valve is finisheddelayThen in the subsequent operation process at the set time TrunIf the high-frequency component detection unit detects the high-frequency component again and the counting unit counts that the number of times of the detected high-frequency component is greater than a set value according to the detection result of the high-frequency component, the calling unit calls the outlet unit of the converter station to enable the converter station to be locked permanently and tripped; if the time of the flexible direct-current transmission converter station working in an island operation mode after the temporary locking converter valve is finished is longer than the set time TdelayThen in the subsequent operation process at the set time TrunIf the high frequency component detecting unit detects the high frequency component again, then the modulation is performedThe unit calls the converter station outlet unit to cause the converter station to directly and permanently latch and trip.
In the above scheme, (1) the device is provided with a starting unit, and the starting unit starting operation state judgment unit judges whether the time of the converter station working in the island operation mode is greater than the set time TdelayOr working in a networking operation mode, and transmitting a judgment result to the high-frequency component detection unit;
(2) the operation state judgment unit judges that the converter station works in an island operation mode for a period of time TdelayThen, if the high-frequency component detection unit detects the high-frequency component, the calling unit calls an outlet unit of the converter station to directly and permanently lock the converter valve and trip;
(3) the operation state judgment unit judges whether the converter station works in the networking operation mode or the island operation mode and does not exceed the time TdelayIf the high-frequency component detection unit detects the high-frequency component, the counting unit of the high-frequency component detection result is added with 1, and the calling unit calls the converter station outlet unit to temporarily lock the converter valve for a period of time TbDuring the period, the calling unit calls the running state judging unit to detect the network side voltage of the flexible direct current transmission converter station and judge whether the alternating current system has an alternating current power supply;
(4) after the temporary locking converter valve is ended, if an alternating current power supply exists in an alternating current system, the operation state judgment unit judges that the flexible direct current transmission converter station works in a networking operation mode, and if the flexible direct current transmission converter station works in a networking operation mode within a set time T in subsequent operationrunThe inner medium-high frequency component detection unit detects the high-frequency component again, and when the high-frequency component detection result counting unit counts that the number of times of the detected high-frequency component is greater than a set value N, the calling unit calls the outlet unit of the converter station to enable the converter station to be permanently locked and tripped;
if the alternating current system has no alternating current power supply, the operation state judgment unit judges that the flexible direct current transmission converter station works in an island operation mode; judging the time of the converter station working in an island operation mode by an operation state judging unit, and if the island operation time exceeds TdelayWhen the high-frequency component detection unit detects the high-frequency component, the calling unit calls the outlet unit of the converter stationConnecting a permanently locked converter valve and tripping the converter valve if the island operation time does not exceed TdelayThen, in the subsequent operation, if the time is set to be TrunThe inner medium-high frequency component detection unit detects the high-frequency component again, and when the high-frequency component detection result counting unit counts that the number of times of the detected high-frequency component is greater than a set value N, the calling unit calls the outlet unit of the converter station to enable the converter station to be permanently locked and tripped; (ii) a
If the temporary locking converter valve is finished, the subsequent operation time TrunAnd if the high-frequency component detecting unit does not detect the high-frequency component, the high-frequency component detecting unit resets the counter, and the calling unit calls the starting unit again.
In the above solution, the high-frequency component detecting unit includes a voltage maximum value detecting unit, a frequency calculating unit, and a high-frequency component determining unit, wherein:
the voltage maximum value detection unit is used for detecting the maximum absolute value in a three-phase voltage period and sending the maximum absolute value to the frequency calculation unit;
the frequency calculating unit is used for calculating voltage frequency according to the maximum absolute value of the voltage of the received maximum voltage detecting unit; if the maximum absolute value | U of a phase voltage in a periodpeak|≥Upeak_setJudging the frequency of the frequency through a zero crossing point; if the maximum absolute value | U of a phase voltage in a periodpeak|＜Upeak_setJudging that the phase voltage frequency is a reference frequency; wherein, Upeak_setIs a voltage threshold;
the high-frequency component determination unit receives the calculation result of the frequency calculation unit, and when the frequency of any two phases of the three-phase voltage is greater than the frequency set value fsetAnd continues for a set time thfdelayThe high frequency component is determined to be present.
In the above scheme, in the outlet unit of the converter station, the temporary blocking of the converter valve refers to temporarily blocking all bridge arms of the whole converter valve, rather than temporarily blocking only one bridge arm of the converter valve, and the temporary blocking time t of the temporary blocking of the bridge arm of the converter valveb＞5ms。
In the above scheme, the high-frequency component detection result counting unit suspends counting statistics on the detection result of the high-frequency component detection logic during the temporary locking of the converter valve, and the counting unit outputs the maximum set value N which is not less than 2.
After the scheme is adopted, the invention has the beneficial effects that:
(1) the method and the device for processing the high-frequency component of the flexible direct-current power transmission system provided by the invention can be used for rapidly detecting the high-frequency component in the operation of the system and processing the high-frequency component in time so as to prevent the system and user equipment from being damaged;
(2) the method and the device for processing the high-frequency component of the flexible direct-current transmission system provided by the invention can be used for avoiding permanent locking of the flexible direct-current transmission system when the high-frequency component occurs, particularly locking tripping in a networking-to-islanding process.
Drawings
Fig. 1 is a flow chart of a method of processing high frequency components for a flexible dc power transmission system;
fig. 2 is a schematic diagram of high frequency component detection logic.
Detailed Description
The technical solution of the present invention will be described in detail below with reference to the accompanying drawings and specific embodiments.
The invention provides a method for processing high-frequency components by a flexible direct current transmission system.
Method example 1:
a method for processing high-frequency components by a flexible direct current transmission system is disclosed, wherein a converter station of the flexible direct current transmission system has two operation modes of networking and island, and the method is configured with high-frequency component detection logic; when the flexible direct current transmission converter station works in an island operation mode for a time longer than a set time TdelayThen, if the high-frequency component detection logic detects the high-frequency component, the converter station is directly and permanently locked and tripped;
when the flexible direct-current transmission converter station works on the networking operation sideThe operation mode of the island or the like does not exceed the set time TdelayWhen the high-frequency component is detected by the high-frequency component detection logic, the converter valve is temporarily locked for a period of time Tb(ii) a During the temporary locking of the converter valve, detecting the network side voltage of the flexible direct current transmission converter station, and judging whether an alternating current power supply exists in an alternating current system; after the temporary locking of the converter valve is finished, if an alternating current power supply exists in the alternating current system, the flexible direct current transmission converter station is set to work in a networking operation mode, and when the alternating current power supply does not exist in the alternating current system, the flexible direct current transmission converter station is set to work in an island operation mode; if the flexible direct-current transmission converter station works in the networking operation mode or the island operation mode without exceeding the set time T after the temporary locking converter valve is finisheddelayThen in the subsequent operation process at the set time TrunDetecting the high-frequency component again, wherein the frequency of the detected high-frequency component is greater than a set value, and permanently locking and tripping the converter station; if the time of the flexible direct-current transmission converter station working in an island operation mode after the temporary locking converter valve is finished is longer than the set time TdelayThen in the subsequent operation process at the set time TrunAnd the high frequency component is detected again, the converter station is directly permanently locked out and tripped.
In the above scheme, the set time TrunThe value range is as follows: t isrun≥10ms。
In the above scheme, the high frequency component detection logic, as shown in fig. 2, includes the following steps:
(21) detecting the maximum absolute value of the three-phase voltage in a period;
(22) if the maximum absolute value | U of a phase voltage in a periodpeak|≥Upeak_setJudging the frequency of the frequency through a zero crossing point; if the maximum absolute value | U of a phase voltage in a periodpeak|＜Upeak_setJudging that the phase voltage frequency is a reference frequency; wherein, Upeak_setIs a voltage threshold;
(23) when the frequency of any two phases in the three-phase voltage is greater than the frequency set value fsetAnd continues for a set time thfdelayThe high frequency component is determined to be present.
In the above scheme, the set time thfdelayThe value range is as follows: t is thfdelay＞5ms。
In the above scheme, the temporary locking converter valve refers to temporarily locking all bridge arms of the whole converter valve, and the temporary locking time t isb＞5ms。
In the above scheme, the specific method for judging whether the ac system has the ac power supply includes: if the net side voltage effective value UsrmsGreater than a voltage set value UsetI.e. Usrms＞UsetIf so, judging that the alternating current system has the alternating current power supply, otherwise, judging that the alternating current system does not have the alternating current power supply.
Method example 2:
as shown in fig. 1, the method specifically comprises the following steps:
(1) judging the running state of the flexible direct current transmission converter station, and if the time of working in an island running mode is more than the set time TdelayThen, executing the step (2); if the working in the networking operation mode or the island operation mode does not exceed the set time TdelayIf yes, executing the step (3);
(2) the time of working in an island operation mode is more than TdelayIf the high-frequency component is detected by the high-frequency component detection logic, the converter station is directly and permanently locked and tripped, the following steps are not executed, and otherwise, the high-frequency component detection is continued;
(3) working in a networking operation mode or an island operation mode does not exceed the time TdelayIf the high-frequency component is detected by the high-frequency component detection logic, adding 1 to a counter, and executing the step (4), otherwise, continuing to detect the high-frequency component;
(4) temporarily blocking the converter valve for a period of time TbDetecting the network side voltage of the flexible direct current transmission converter station during the temporary locking of the converter valve, judging whether an alternating current system has an alternating current power supply, and then executing the step (5);
(5) after the temporary locking of the converter valve is finished, if an alternating current power supply exists in the alternating current system, the flexible direct current transmission converter station maintains the original operation mode, and the step (7) is executed; if the alternating current system has no alternating current power supply, the flexible direct current transmission converter station is switched to be operated in an isolated island mode, and the step (6) is executed;
(6) the operation state judgment unit judges the time of the converter station working in the island operation mode, and if the island operation time exceeds TdelayTurning to the step (2), if the island operation time does not exceed TdelayIf yes, executing step (7);
(7) if the subsequent operation is in progress, the set time T isrunIf the high-frequency component is detected again, executing the step (8), otherwise, executing the step (9);
(8) adding 1 to the counter, when the value of the counter is greater than a set value N, permanently locking and tripping the converter station, and not executing the following steps, and when the value of the counter is less than or equal to N, executing the step (4) again;
(9) if the subsequent operation time TrunIf no high frequency component is detected in the counter, resetting the counter and executing the step (1) again.
In the above scheme, the set time TrunThe value range is as follows: t isrun≥10ms。
In the above scheme, the high frequency component detection logic, as shown in fig. 2, includes the following steps:
(21) detecting the maximum absolute value of the three-phase voltage in a period;
(22) if the maximum absolute value | U of a phase voltage in a periodpeak|≥Upeak_setJudging the frequency of the frequency through a zero crossing point; if the maximum absolute value | U of a phase voltage in a periodpeak|＜Upeak_setJudging that the phase voltage frequency is a reference frequency; wherein, Upeak_setIs a voltage threshold;
(23) when the frequency of any two phases in the three-phase voltage is greater than the frequency set value fsetAnd continues for a set time thfdelayThe high frequency component is determined to be present.
In the above scheme, the set time thfdelayThe value range is as follows: t is thfdelay＞5ms。
In the above scheme, the temporary locking converter valve refers to temporarily locking all bridge arms of the whole converter valve, and when the temporary locking converter valve is temporarily lockedTime tb＞5ms。
In the scheme, the counter suspends counting statistics on the detection result of the high-frequency component detection logic during the temporary locking of the converter valve, and the maximum set value N output by the counter is more than or equal to 2.
In the above scheme, the specific method for judging whether the ac system has the ac power supply includes: if the net side voltage effective value UsrmsGreater than a voltage set value UsetI.e. Usrms＞UsetIf so, judging that the alternating current system has the alternating current power supply, otherwise, judging that the alternating current system does not have the alternating current power supply.
The invention correspondingly provides a device for processing high-frequency components by the flexible direct-current power transmission system.
Apparatus embodiment example 1:
the device comprises:
the operation state judgment unit is used for judging the operation state of the converter station and judging whether an alternating current power supply exists in the alternating current system;
the high-frequency component detection unit is used for detecting the high-frequency component of the converter station in real time;
the high-frequency component detection result counting unit is used for counting the detection result of the high-frequency component detection unit and judging the result;
the converter station outlet unit carries out action processing according to the output results of the operation state judging unit, the high-frequency component detecting unit and the high-frequency component detecting result counting unit, and the action result comprises: temporarily locking the converter valve, permanently locking the converter valve and tripping;
and the calling unit is used for calling each unit to perform related processing.
In the above solution, the high-frequency component detecting unit includes a voltage maximum value detecting unit, a frequency calculating unit, and a high-frequency component determining unit, wherein:
the voltage maximum value detection unit is used for detecting the maximum absolute value in a three-phase voltage period and sending the maximum absolute value to the frequency calculation unit;
the frequency calculation unit is used for detecting the maximum value of the received voltageCalculating the voltage frequency according to the maximum absolute value of the voltage of the unit; if the maximum absolute value | U of a phase voltage in a periodpeak|≥Upeak_setJudging the frequency of the frequency through a zero crossing point; if the maximum absolute value | U of a phase voltage in a periodpeak|＜Upeak_setJudging that the phase voltage frequency is a reference frequency; wherein, Upeak_setIs a voltage threshold;
the high-frequency component determination unit receives the calculation result of the frequency calculation unit, and when the frequency of any two phases of the three-phase voltage is greater than the frequency set value fsetAnd continues for a set time thfdelayThe high frequency component is determined to be present.
In the above scheme, in the outlet unit of the converter station, the temporary blocking of the converter valve refers to temporarily blocking all bridge arms of the whole converter valve, rather than temporarily blocking only one bridge arm of the converter valve, and the temporary blocking time t of the temporary blocking of the bridge arm of the converter valveb＞5ms。
In the above scheme, the high-frequency component detection result counting unit suspends counting statistics on the detection result of the high-frequency component detection logic during the temporary locking of the converter valve, and the counting unit outputs the maximum set value N which is not less than 2.
Device embodiment 2:
the device comprises:
the operation state judgment unit is used for judging the operation state of the converter station and judging whether an alternating current power supply exists in the alternating current system;
the high-frequency component detection unit is used for detecting the high-frequency component of the converter station in real time;
the high-frequency component detection result counting unit is used for counting the detection result of the high-frequency component detection unit and judging the result;
the converter station outlet unit carries out action processing according to the output results of the operation state judging unit, the high-frequency component detecting unit and the high-frequency component detecting result counting unit, and the action result comprises: temporarily locking the converter valve, permanently locking the converter valve and tripping;
and the calling unit is used for calling each unit to perform related processing.
The calling unit calls an operation state judgment unit, and the operation state judgment unit judges that the time of the flexible direct current transmission converter station working in an island operation mode is longer than the set time TdelayThen, if the high-frequency component detection unit detects the high-frequency component, the calling unit calls a converter station outlet unit to enable the converter station to be directly and permanently locked and tripped;
the operation state judgment unit judges that the flexible direct current transmission converter station works in the networking operation mode or the island operation mode not to exceed the set time TdelayIf the high-frequency component detection unit detects the high-frequency component, the calling unit calls the converter station outlet unit to temporarily lock the converter valve for a period of time Tb(ii) a During the temporary locking of the converter valve, the operation state judgment unit detects the network side voltage of the flexible direct current transmission converter station and judges whether an alternating current power supply exists in the alternating current system, after the temporary locking of the converter valve is finished, if the alternating current power supply exists in the alternating current system, the flexible direct current transmission converter station is set to work in a networking operation mode, and when the alternating current system does not have the alternating current power supply, the flexible direct current transmission converter station is set to work in an island operation mode; if the flexible direct-current transmission converter station works in the networking operation mode or the island operation mode without exceeding the set time T after the temporary locking converter valve is finisheddelayThen in the subsequent operation process at the set time TrunIf the high-frequency component detection unit detects the high-frequency component again and the counting unit counts that the number of times of the detected high-frequency component is greater than a set value according to the detection result of the high-frequency component, the calling unit calls the outlet unit of the converter station to enable the converter station to be locked permanently and tripped; if the time of the flexible direct-current transmission converter station working in an island operation mode after the temporary locking converter valve is finished is longer than the set time TdelayThen in the subsequent operation process at the set time TrunIf the high-frequency component detection unit detects the high-frequency component again, the calling unit calls the converter station outlet unit to enable the converter station to be directly and permanently locked and tripped.
In the above solution, the high-frequency component detecting unit includes a voltage maximum value detecting unit, a frequency calculating unit, and a high-frequency component determining unit, wherein:
the voltage maximum value detection unit is used for detecting the maximum absolute value in a three-phase voltage period and sending the maximum absolute value to the frequency calculation unit;
the frequency calculating unit is used for calculating voltage frequency according to the maximum absolute value of the voltage of the received maximum voltage detecting unit; if the maximum absolute value | U of a phase voltage in a periodpeak|≥Upeak_setJudging the frequency of the frequency through a zero crossing point; if the maximum absolute value | U of a phase voltage in a periodpeak|＜Upeak_setJudging that the phase voltage frequency is a reference frequency; wherein, Upeak_setIs a voltage threshold;
the high-frequency component determination unit receives the calculation result of the frequency calculation unit, and when the frequency of any two phases of the three-phase voltage is greater than the frequency set value fsetAnd continues for a set time thfdelayThe high frequency component is determined to be present.
In the above scheme, in the outlet unit of the converter station, the temporary blocking of the converter valve refers to temporarily blocking all bridge arms of the whole converter valve, rather than temporarily blocking only one bridge arm of the converter valve, and the temporary blocking time t of the temporary blocking of the bridge arm of the converter valveb＞5ms。
In the above scheme, the high-frequency component detection result counting unit suspends counting statistics on the detection result of the high-frequency component detection logic during the temporary locking of the converter valve, and the counting unit outputs the maximum set value N which is not less than 2.
Device embodiment example 3:
the device comprises:
the operation state judgment unit is used for judging the operation state of the converter station and judging whether an alternating current power supply exists in the alternating current system;
the high-frequency component detection unit is used for detecting the high-frequency component of the converter station in real time;
the high-frequency component detection result counting unit is used for counting the detection result of the high-frequency component detection unit and judging the result;
the converter station outlet unit carries out action processing according to the output results of the operation state judging unit, the high-frequency component detecting unit and the high-frequency component detecting result counting unit, and the action result comprises: temporarily locking the converter valve, permanently locking the converter valve and tripping;
and the calling unit is used for calling each unit to perform related processing.
(1) The device is provided with a starting unit, and the starting unit starting operation state judgment unit judges whether the time of the converter station working in an island operation mode is greater than the set time TdelayOr working in a networking operation mode, and transmitting a judgment result to the high-frequency component detection unit;
(2) the operation state judgment unit judges that the converter station works in an island operation mode for a period of time TdelayThen, if the high-frequency component detection unit detects the high-frequency component, the calling unit calls an outlet unit of the converter station to directly and permanently lock the converter valve and trip;
(3) the operation state judgment unit judges whether the converter station works in the networking operation mode or the island operation mode and does not exceed the time TdelayIf the high-frequency component detection unit detects the high-frequency component, the counting unit of the high-frequency component detection result is added with 1, and the calling unit calls the converter station outlet unit to temporarily lock the converter valve for a period of time TbDuring the period, the calling unit calls the running state judging unit to detect the network side voltage of the flexible direct current transmission converter station and judge whether the alternating current system has an alternating current power supply;
(4) after the temporary locking converter valve is ended, if an alternating current power supply exists in an alternating current system, the operation state judgment unit judges that the flexible direct current transmission converter station works in a networking operation mode, and if the flexible direct current transmission converter station works in a networking operation mode within a set time T in subsequent operationrunThe inner medium-high frequency component detection unit detects the high-frequency component again, and when the high-frequency component detection result counting unit counts that the number of times of the detected high-frequency component is greater than a set value N, the calling unit calls the outlet unit of the converter station to enable the converter station to be permanently locked and tripped;
if the alternating current system has no alternating current power supply, the operation state judgment unit judges that the flexible direct current transmission converter station works in an island operation mode; the operation state judgment unit judges the time of the converter station working in the island operation mode, and if the time is the island operation timeExceeding TdelayWhen the high-frequency component detection unit detects the high-frequency component, the calling unit calls the converter station outlet unit to directly and permanently lock the converter valve and trip, and if the island operation time does not exceed TdelayThen, in the subsequent operation, if the time is set to be TrunThe inner medium-high frequency component detection unit detects the high-frequency component again, and when the high-frequency component detection result counting unit counts that the number of times of the detected high-frequency component is greater than a set value N, the calling unit calls the outlet unit of the converter station to enable the converter station to be permanently locked and tripped; (ii) a
If the temporary locking converter valve is finished, the subsequent operation time TrunAnd if the high-frequency component detecting unit does not detect the high-frequency component, the high-frequency component detecting unit resets the counter, and the calling unit calls the starting unit again.
In the above solution, the high-frequency component detecting unit includes a voltage maximum value detecting unit, a frequency calculating unit, and a high-frequency component determining unit, wherein:
the voltage maximum value detection unit is used for detecting the maximum absolute value in a three-phase voltage period and sending the maximum absolute value to the frequency calculation unit;
the frequency calculating unit is used for calculating voltage frequency according to the maximum absolute value of the voltage of the received maximum voltage detecting unit; if the maximum absolute value | U of a phase voltage in a periodpeak|≥Upeak_setJudging the frequency of the frequency through a zero crossing point; if the maximum absolute value | U of a phase voltage in a periodpeak|＜Upeak_setJudging that the phase voltage frequency is a reference frequency; wherein, Upeak_setIs a voltage threshold;
the high-frequency component determination unit receives the calculation result of the frequency calculation unit, and when the frequency of any two phases of the three-phase voltage is greater than the frequency set value fsetAnd continues for a set time thfdelayThe high frequency component is determined to be present.
In the above scheme, in the outlet unit of the converter station, the temporarily locking converter valve refers to temporarily locking all bridge arms of the whole converter valve, rather than only temporarily locking a certain bridge arm of the converter valve, and temporarily locking the bridge arm of the whole converter valveTime tb＞5ms。
In the above scheme, the high-frequency component detection result counting unit suspends counting statistics on the detection result of the high-frequency component detection logic during the temporary locking of the converter valve, and the counting unit outputs the maximum set value N which is not less than 2.
The above embodiments are only for illustrating the technical idea of the present invention, and the protection scope of the present invention is not limited thereby, and any modifications made on the basis of the technical scheme according to the technical idea of the present invention fall within the protection scope of the present invention.
Claims (13)
1. A method for processing high frequency components of a flexible direct current transmission system is provided, a converter station of the flexible direct current transmission system has two operation modes of networking and island, and the method is characterized in that high frequency component detection logic is configured; when the flexible direct current transmission converter station works in an island operation mode for a time longer than a set time TdelayThen, if the high-frequency component detection logic detects the high-frequency component, the converter station is directly and permanently locked and tripped;
when the flexible direct current transmission converter station works in a networking operation mode, or the flexible direct current transmission converter station works in an island operation mode and does not exceed the set time TdelayWhen the high-frequency component is detected by the high-frequency component detection logic, the converter valve is temporarily locked for a period of time Tb(ii) a During the temporary locking of the converter valve, detecting the network side voltage of the flexible direct current transmission converter station, and judging whether an alternating current power supply exists in an alternating current system; after the temporary locking of the converter valve is finished, if an alternating current power supply exists in the alternating current system, the flexible direct current transmission converter station is set to work in a networking operation mode, and when the alternating current power supply does not exist in the alternating current system, the flexible direct current transmission converter station is set to work in an island operation mode; if the flexible direct-current transmission converter station works in the networking operation mode or the island operation mode without exceeding the set time T after the temporary locking converter valve is finisheddelayThen in the subsequent operation process at the set time TrunDetecting the high-frequency component again, wherein the frequency of the detected high-frequency component is greater than a set value, and permanently locking and tripping the converter station; if temporary blocking commutationAfter the valve is finished, the flexible direct current transmission converter station works in an island operation mode for a time longer than a set time TdelayThen in the subsequent operation process at the set time TrunAnd the high frequency component is detected again, the converter station is directly permanently locked out and tripped.
2. The method according to claim 1, wherein the method comprises the following steps:
(1) judging the running state of the flexible direct current transmission converter station, and if the time of working in an island running mode is more than the set time TdelayThen, executing the step (2); if the operation mode is in the networking operation mode or in the island operation mode does not exceed the set time TdelayIf yes, executing the step (3);
(2) the time of working in an island operation mode is more than TdelayIf the high-frequency component is detected by the high-frequency component detection logic, the converter station is directly and permanently locked and tripped, the following steps are not executed, and otherwise, the high-frequency component detection is continued;
(3) working in a networking operation mode or an island operation mode does not exceed the time TdelayIf the high-frequency component is detected by the high-frequency component detection logic, adding 1 to a counter, and executing the step (4), otherwise, continuing to detect the high-frequency component;
(4) temporarily blocking the converter valve for a period of time TbDetecting the network side voltage of the flexible direct current transmission converter station during the temporary locking of the converter valve, judging whether an alternating current system has an alternating current power supply, and then executing the step (5);
(5) after the temporary locking of the converter valve is finished, if an alternating current power supply exists in the alternating current system, the flexible direct current transmission converter station maintains the original operation mode, and the step (7) is executed; if the alternating current system has no alternating current power supply, the flexible direct current transmission converter station is switched to be operated in an isolated island mode, and the step (6) is executed;
(6) the operation state judgment unit judges the time of the converter station working in the island operation mode, and if the island operation time exceeds TdelayThen go to step (2) If the island operation time does not exceed TdelayIf yes, executing step (7);
(7) if the subsequent operation is in progress, the set time T isrunIf the high-frequency component is detected again, executing the step (8), otherwise, executing the step (9);
(8) adding 1 to the counter, when the value of the counter is greater than a set value N, permanently locking and tripping the converter station, and not executing the following steps, and when the value of the counter is less than or equal to N, executing the step (4) again;
(9) if the subsequent operation time TrunIf no high frequency component is detected in the counter, resetting the counter and executing the step (1) again.
3. A method of handling high frequency components in a flexible direct current transmission system according to claim 1 or 2, characterized in that said set time T isrunThe value range is as follows: t isrun≥10ms。
4. A method of processing high frequency components in a flexible dc power transmission system according to claim 1 or 2, wherein said high frequency component detection logic comprises the steps of:
(21) detecting the maximum absolute value of the three-phase voltage in a period;
(22) if the maximum absolute value | U of a phase voltage in a periodpeak|≥Upeak_setJudging the frequency of the frequency through a zero crossing point; if the maximum absolute value | U of a phase voltage in a periodpeak|＜Upeak_setJudging that the phase voltage frequency is a reference frequency; wherein, Upeak_setIs a voltage threshold;
(23) when the frequency of any two phases in the three-phase voltage is greater than the frequency set value fsetAnd continues for a set time thfdelayThe high frequency component is determined to be present.
5. The method according to claim 4, wherein the set time t is sethfdelayThe value range is as follows: t is thfdelay＞5ms。
6. Method for handling high frequency components in a flexible direct current transmission system according to claim 1 or 2, characterized in that said temporarily blocking converter valves means temporarily blocking all legs of the whole converter valve for a temporary blocking time tb＞5ms。
7. The method according to claim 2, wherein the counter suspends counting the detection result of the high frequency component detection logic during the temporary blocking of the converter valve, and outputs a maximum set value N ≧ 2.
8. The method for processing high-frequency components in a flexible direct current transmission system according to claim 1 or 2, wherein the judging whether the alternating current system has the alternating current power supply is carried out by: if the net side voltage effective value UsrmsGreater than a voltage set value UsetI.e. Usrms＞UsetIf so, judging that the alternating current system has the alternating current power supply, otherwise, judging that the alternating current system does not have the alternating current power supply.
9. An apparatus for processing high frequency components in a flexible direct current transmission system, comprising:
the operation state judgment unit is used for judging the operation state of the converter station and judging whether an alternating current power supply exists in the alternating current system;
the high-frequency component detection unit is used for detecting the high-frequency component of the converter station in real time;
the high-frequency component detection result counting unit is used for counting the detection result of the high-frequency component detection unit and judging the result;
the converter station outlet unit carries out action processing according to the output results of the operation state judging unit, the high-frequency component detecting unit and the high-frequency component detecting result counting unit, and the action result comprises: temporarily locking the converter valve, permanently locking the converter valve and tripping;
a calling unit for calling the operation state judgment sheetThe operation state judgment unit judges that the time of the flexible direct current transmission converter station working in the island operation mode is greater than the set time TdelayThen, if the high-frequency component detection unit detects the high-frequency component, the calling unit calls a converter station outlet unit to enable the converter station to be directly and permanently locked and tripped; when the operation state judgment unit judges that the flexible direct current transmission converter station works in the networking operation mode or the flexible direct current transmission converter station works in the island operation mode and does not exceed the set time TdelayIf the high-frequency component detection unit detects the high-frequency component, the calling unit calls the converter station outlet unit to temporarily lock the converter valve for a period of time Tb(ii) a During the temporary locking of the converter valve, the operation state judgment unit detects the network side voltage of the flexible direct current transmission converter station and judges whether an alternating current power supply exists in the alternating current system, after the temporary locking of the converter valve is finished, if the alternating current power supply exists in the alternating current system, the flexible direct current transmission converter station is set to work in a networking operation mode, and when the alternating current system does not have the alternating current power supply, the flexible direct current transmission converter station is set to work in an island operation mode; if the flexible direct-current transmission converter station works in the networking operation mode or the island operation mode without exceeding the set time T after the temporary locking converter valve is finisheddelayThen in the subsequent operation process at the set time TrunIf the high-frequency component detection unit detects the high-frequency component again and the counting unit counts that the number of times of the detected high-frequency component is greater than a set value according to the detection result of the high-frequency component, the calling unit calls the outlet unit of the converter station to enable the converter station to be locked permanently and tripped; if the time of the flexible direct-current transmission converter station working in an island operation mode after the temporary locking converter valve is finished is longer than the set time TdelayThen in the subsequent operation process at the set time TrunIf the high-frequency component detection unit detects the high-frequency component again, the calling unit calls the converter station outlet unit to enable the converter station to be directly and permanently locked and tripped.
10. The apparatus according to claim 9, wherein the flexible direct current transmission system processes a high frequency component:
(1) the device sets a start sheetThe starting unit starting operation state judgment unit judges whether the time of the converter station working in the island operation mode is greater than the set time TdelayOr working in a networking operation mode, and transmitting a judgment result to the high-frequency component detection unit;
(2) the operation state judgment unit judges that the converter station works in an island operation mode for a period of time TdelayThen, if the high-frequency component detection unit detects the high-frequency component, the calling unit calls an outlet unit of the converter station to directly and permanently lock the converter valve and trip;
(3) when the operation state judgment unit judges that the converter station works in the networking operation mode or works in the island operation mode without exceeding the time TdelayIf the high-frequency component detection unit detects the high-frequency component, the counting unit of the high-frequency component detection result is added with 1, and the calling unit calls the converter station outlet unit to temporarily lock the converter valve for a period of time TbDuring the period, the calling unit calls the running state judging unit to detect the network side voltage of the flexible direct current transmission converter station and judge whether the alternating current system has an alternating current power supply;
(4) after the temporary locking converter valve is ended, if an alternating current power supply exists in an alternating current system, the operation state judgment unit judges that the flexible direct current transmission converter station works in a networking operation mode, and if the flexible direct current transmission converter station works in a networking operation mode within a set time T in subsequent operationrunThe inner medium-high frequency component detection unit detects the high-frequency component again, and when the high-frequency component detection result counting unit counts that the number of times of the detected high-frequency component is greater than a set value N, the calling unit calls the outlet unit of the converter station to enable the converter station to be permanently locked and tripped;
if the alternating current system has no alternating current power supply, the operation state judgment unit judges that the flexible direct current transmission converter station works in an island operation mode; judging the time of the converter station working in an island operation mode by an operation state judging unit, and if the island operation time exceeds TdelayWhen the high-frequency component detection unit detects the high-frequency component, the calling unit calls the converter station outlet unit to directly and permanently lock the converter valve and trip, and if the island operation time does not exceed TdelayThen, in the subsequent operation, if the time is set to be TrunMedium and high frequency divisionThe quantity detection unit detects the high-frequency component again, and when the high-frequency component detection result counting unit counts that the number of times of the detected high-frequency component is greater than a set value N, the calling unit calls the converter station outlet unit to enable the converter station to be locked permanently and tripped out;
if the temporary locking converter valve is finished, the subsequent operation time TrunAnd if the high-frequency component detecting unit does not detect the high-frequency component, the high-frequency component detecting unit resets the counter, and the calling unit calls the starting unit again.
11. The apparatus for processing a high-frequency component in a flexible direct current transmission system according to any one of claims 9 to 10, wherein said high-frequency component detecting unit includes a voltage maximum value detecting unit, a frequency calculating unit, and a high-frequency component determining unit, wherein:
the voltage maximum value detection unit is used for detecting the maximum absolute value in a three-phase voltage period and sending the maximum absolute value to the frequency calculation unit;
the frequency calculating unit is used for calculating voltage frequency according to the maximum absolute value of the voltage of the received maximum voltage detecting unit; if the maximum absolute value | U of a phase voltage in a periodpeak|≥Upeak_setJudging the frequency of the frequency through a zero crossing point; if the maximum absolute value | U of a phase voltage in a periodpeak|＜Upeak_setJudging that the phase voltage frequency is a reference frequency; wherein, Upeak_setIs a voltage threshold;
the high-frequency component determination unit receives the calculation result of the frequency calculation unit, and when the frequency of any two phases of the three-phase voltage is greater than the frequency set value fsetAnd continues for a set time thfdelayThe high frequency component is determined to be present.
12. An arrangement for handling high frequency components in a flexible direct current transmission system according to any of claims 9 to 10, characterized in that in the outlet unit of the converter station, said temporarily blocking of the converter valves means temporarily blocking all legs of the whole converter valves, instead of only a certain leg of the converter valves, which is adjacent to the temporarily blocking of the whole converter valvesTime of day lock time tb＞5ms。
13. The apparatus for processing high frequency components in a flexible direct current transmission system according to any one of claims 9 to 10, wherein said high frequency component detection result counting unit suspends counting statistics of the detection results of the high frequency component detection logic during temporary blocking of the converter valve, and outputs a maximum set value N ≧ 2.
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