CN113258597A - Method and device for controlling bipolar power balance and storage medium - Google Patents
Method and device for controlling bipolar power balance and storage medium Download PDFInfo
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- CN113258597A CN113258597A CN202110497782.4A CN202110497782A CN113258597A CN 113258597 A CN113258597 A CN 113258597A CN 202110497782 A CN202110497782 A CN 202110497782A CN 113258597 A CN113258597 A CN 113258597A
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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
- H02J3/001—Methods to deal with contingencies, e.g. abnormalities, faults or failures
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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 relates to the technical field of direct current transmission, and discloses a control method, a device and a storage medium for bipolar power balance, wherein the method comprises the following steps: and acquiring the operation mode of the three-terminal direct-current power transmission system, and carrying out bipolar power balance on the three-terminal direct-current power transmission system according to the operation mode. The bipolar power balance control method, the bipolar power balance control device and the storage medium provided by the invention can realize bipolar power balance control of a three-terminal direct-current power transmission system and reduce the risk of direct-current bipolar locking.
Description
Technical Field
The present invention relates to the field of dc power transmission technologies, and in particular, to a method and an apparatus for controlling bipolar power balance, and a storage medium.
Background
The high-capacity conventional high-voltage direct-current transmission project in China adopts a bipolar symmetrical main loop wiring topology as a bipolar public area, and bipolar neutral lines and grounding electrode lines belong to important parts of a high-voltage direct-current transmission system. When the direct current is in bipolar balanced operation, the current flowing into the bipolar area is zero, and in this way, when the bipolar area has a ground short circuit or open circuit (disconnection) fault, the direct current system has no obvious voltage and current change characteristics, and the system allows the continuous operation without harm with the fault. Conversely, when the bipolar is operated in an unbalanced mode, an unbalanced current flows into the ground through the bipolar area. At the moment, once a fault occurs, after the protection is correctly judged and exported, the two poles need to be controlled by a control system to enter balanced operation, and the risk of direct current bipolar locking is reduced. Therefore, bipolar power balancing is a very important control function for bipolar area protection.
However, the conventional bipolar power balance method mainly aims at a two-terminal direct-current transmission system, firstly calculates a bipolar unbalanced current, and then subtracts the unbalanced current through power limitation or evenly distributes the unbalanced current to a bipolar to realize bipolar power balance. The method does not consider the distribution of unbalanced current regulation in the three-terminal direct-current system, cannot meet the bipolar power balance requirement of the three-terminal direct-current transmission system, and has the risk of direct-current bipolar locking.
Disclosure of Invention
The technical problem to be solved by the embodiment of the invention is as follows: the bipolar power balance control method, the bipolar power balance control device and the storage medium are provided, bipolar power balance control of a three-terminal direct-current power transmission system is achieved, and risks of direct-current bipolar locking are reduced.
In order to solve the above technical problem, in a first aspect, an embodiment of the present invention provides a bipolar power balancing method for a three-terminal dc power transmission system, where the three-terminal dc power transmission system includes a first converter station, a second converter station, and a third converter station, the method includes:
s1: acquiring the operation mode of the three-terminal direct-current power transmission system;
s2: when the operation mode is a first operation mode, judging which converter station needs to carry out bipolar power balance; wherein the first operating mode is: the working modes of the first converter station and the second converter station are a rectification mode, and the working mode of the third converter station is an inversion mode;
s3: when the first converter station needs to perform bipolar power balance, setting Iref _ a1_ new to Iref _ a2_ new to min { Iref _ a1_ old, Iref _ a2_ old }, and ending; iref _ a1_ new is a current reference value after the bipolar power balance of the pole 1 of the first converter station, Iref _ a2_ new is a current reference value after the bipolar power balance of the pole 2 of the first converter station, Iref _ a1_ old is a current reference value before the bipolar power balance of the pole 1 of the first converter station, and Iref _ a2_ old is a current reference value before the bipolar power balance of the pole 2 of the first converter station;
s4: when the second converter station needs to perform bipolar power balance, setting Iref _ B1_ new to Iref _ B2_ new to min { Iref _ B1_ old, Iref _ B2_ old }, and ending; iref _ B1_ new is a current reference value after the bipolar power balance is performed on the pole 1 of the second converter station, Iref _ B2_ new is a current reference value after the bipolar power balance is performed on the pole 2 of the second converter station, Iref _ B1_ old is a current reference value before the bipolar power balance is performed on the pole 1 of the second converter station, and Iref _ B2_ old is a current reference value before the bipolar power balance is performed on the pole 2 of the second converter station;
s5: when the third converter station needs to perform bipolar power balance, determining operation modes of the first converter station, the second converter station and the third converter station, if the first converter station, the second converter station and the third converter station all operate in bipolar mode, executing step S51, if the first converter station and the second converter station operate in unipolar mode and the third converter station operates in bipolar mode, executing step S51, if one of the converter stations in a rectification mode operates in unipolar mode, and the other converter station in the rectification mode and the third converter station operate in bipolar mode, executing step S52;
s51: comparing the magnitude relation between Iact _ C2 and Iact _ C1, executing step S512 when Iact _ C2 is larger than or equal to Iact _ C1, and executing step S511 when Iact _ C2 is smaller than Iact _ C1; wherein Iact _ C1 is the actual current before bipolar power balancing of the pole 1 of the third converter station, Iact _ C2 is the actual current before bipolar power balancing of the pole 2 of the third converter station;
s511: setting Iref _ B1_ new to Iref _ B1_ old-abs (Iact _ C2-Iact _ C1), comparing the size relationship of Iref _ B1_ new and Imin _ B1, if Iref _ B1_ new is less than Imin _ B1, setting Iref _ A1_ new to Iref _ A1_ old- [ abs (Iact _ C2-Iact _ C1) - (Iref _ B1_ old-Imin _ B1) ], and ending if Iref _ B1_ new > Imin _ B1; wherein Imin _ B1 is the minimum allowable operating current value for pole 1 of the second converter station;
s512: setting Iref _ B2_ new to Iref _ B2_ old-abs (Iact _ C2-Iact _ C1), comparing the size relationship of Iref _ B2_ new and Imin _ B2, if Iref _ B2_ new is less than Imin _ B2, setting Iref _ A2_ new to Iref _ A2_ old- [ abs (Iact _ C2-Iact _ C1) - (Iref _ B2_ old-Imin _ B2) ], and ending if Iref _ B2_ new > Imin _ B2; wherein Imin _ B2 is the minimum allowable operating current value for pole 1 of the second converter station;
s52: determining which of the two poles is non-three-terminal operation, if the pole is pole 1, executing step S521, and if the pole is pole 2, executing step S522;
s521: comparing the magnitude relation between Iact _ C1 and Imin _ C2, if Iact _ C1 is less than or equal to Imin _ C2, executing step S5211, and if Iact _ C1 is more than Imin _ C2, executing step S51; wherein Imin _ C2 is the minimum allowable operating current value for pole 2 of the third converter station;
s5211: setting Iref _ a2_ new to Imin _ a2 and Iref _ B2_ new to Imin _ B2, if the second converter station is in bipolar operation, setting Iref _ B1_ new to Imin _ C2, if the first converter station is in bipolar operation, setting Iref _ a1_ new to Imin _ C2, and ending; wherein Imin _ a2 is a minimum allowable operating current value for pole 2 of the first converter station;
s522: comparing the magnitude relation between Iact _ C2 and Imin _ C1, if Iact _ C2 is less than or equal to Imin _ C1, executing step S5221, and if Iact _ C2 is more than Imin _ C1, executing step S51; wherein Imin _ C1 is the minimum allowable operating current value for pole 1 of the third converter station;
s5221: setting Iref _ a1_ new to Imin _ a1 and Iref _ B1_ new to Imin _ B1, if the second converter station is in bipolar operation, setting Iref _ B2_ new to Imin _ C1, if the first converter station is in bipolar operation, setting Iref _ a2_ new to Imin _ C1, and ending; wherein Imin _ a1 is the minimum allowable operating current value for pole 1 of said first converter station.
As a preferable scheme, after the step S1, the method further includes:
s6: when the operation mode is a second operation mode, judging which converter station needs to carry out bipolar power balance; wherein the second operating mode is: the working mode of the first converter station is a rectification mode, and the working modes of the second converter station and the third converter station are inversion modes;
s7: when the first converter station needs to perform bipolar power balance, determining operation modes of the first converter station, the second converter station and the third converter station, if the first converter station, the second converter station and the third converter station all operate in bipolar mode, executing step S71, if one of the converter stations in the inversion mode operates in a monopolar mode, and if the other converter station in the inversion mode operates in a bipolar mode and the first converter station operates in a bipolar mode, executing step S72, and if the first converter station operates in bipolar mode and the second converter station and the third converter station operate in a monopolar mode, executing step S71;
s71: comparing the magnitude relation between Iact _ A2 and Iact _ A1, executing step S712 when Iact _ A2 is not less than Iact _ A1, and executing step S711 when Iact _ A2 is less than Iact _ A1; wherein Iact _ a1 is the actual current before bipolar power balancing of pole 1 of the first converter station and Iact _ a2 is the actual current before bipolar power balancing of pole 2 of the first converter station;
s711: iref _ a1_ new is set to Iref _ a1_ old-abs (Iact _ a2-Iact _ a1), Iref _ B1_ new is set to Iref _ B1_ old-abs (Iact _ a2-Iact _ a 1); meanwhile, the sizes of Iref _ B1_ new and Imin _ B1 are judged, and if Iref _ B1_ new is not less than Imin _ B1, the operation is ended; if Iref _ B1_ new < Imin _ B1, resetting Iref _ B1_ new to Imin _ B1, and ending;
s712: iref _ a2_ new is set to Iref _ a2_ old-abs (Iact _ a2-Iact _ a1), Iref _ B2_ new is set to Iref _ B2_ old-abs (Iact _ a2-Iact _ a 1); meanwhile, the sizes of Iref _ B2_ new and Imin _ B2 are judged, and if Iref _ B2_ new is not less than Imin _ B2, the operation is ended; if Iref _ B2_ new < Imin _ B2, resetting Iref _ B2_ new to Imin _ B2, and ending;
s72: determining which of the two poles is not operated at three ends, if so, executing step S721, and if so, executing step S722;
s721: comparing the magnitude relation between Iact _ A1 and Imin _ A2, if Iact _ A1 is less than or equal to Imin _ A2, executing step S7211, and if Iact _ A1 is more than Imin _ A2, executing step S71;
s7211: setting Iref _ a1_ new to Iref _ a2_ new to Imin _ a2, and if the second converter station operates in bipolar mode, setting Iref _ B2_ new to Imin _ B2, and ending;
s722: comparing the magnitude relation between Iact _ A2 and Imin _ A1, executing step S7221 if Iact _ A2 is less than or equal to Imin _ A1, and executing step S71 if Iact _ A2 is more than Imin _ A1;
s7221: setting Iref _ a2_ new to Iref _ a1_ new to Imin _ a1, and if the second converter station operates in bipolar mode, setting Iref _ B1_ new to Imin _ B1, and ending;
s8: when the second converter station needs to perform bipolar power balance, setting Iref _ B1_ new to Iref _ B2_ new to min { Iref _ B1_ old, Iref _ B2_ old }, comparing the magnitude relationship between Iact _ B2 and Iact _ B1, executing step S81 when Iact _ B2 is greater than Iact _ B1, and executing step S82 when Iact _ B2 is less than or equal to Iact _ B1; wherein Iact _ B1 is the actual current before bipolar power balancing of the pole 1 of the second converter station, Iact _ B2 is the actual current before bipolar power balancing of the pole 2 of the second converter station;
s81: setting Iref _ A2_ new as Iref _ A2_ old-abs (Iact _ B2-Iact _ B1), and ending;
s82: setting Iref _ A1_ new as Iref _ A1_ old-abs (Iact _ B2-Iact _ B1), and ending;
s9: when the third converter station needs to carry out bipolar power balance, comparing the magnitude relation between Iact _ C2 and Iact _ C1, if Iact _ C2 is greater than Iact _ C1, executing step S91, and if Iact _ C2 is less than or equal to Iact _ C1, executing step S92;
s91: setting Iref _ A2_ new as Iref _ A2_ old-abs (Iact _ C2-Iact _ C1), and ending;
s92: iref _ a1_ new is set to Iref _ a1_ old-abs (Iact _ C2-Iact _ C1), and the process ends.
In order to solve the above technical problem, in a second aspect, an embodiment of the present invention provides a bipolar power balance control apparatus, including:
a memory for storing a computer program;
a processor for executing the computer program;
wherein the processor, when executing the computer program, implements the method of bipolar power balance control according to any of the first aspect,
in order to solve the above technical problem, in a third aspect, an embodiment of the present invention provides a computer-readable storage medium storing a computer program, which when executed, implements the bipolar power balance control method according to any one of the first aspect.
Compared with the prior art, the bipolar power balance control method, the bipolar power balance control device and the storage medium provided by the embodiment of the invention have the beneficial effects that: by acquiring the operation mode of the three-terminal direct-current power transmission system and performing bipolar power balance on the three-terminal direct-current power transmission system according to the operation mode, bipolar power balance control of the three-terminal direct-current power transmission system can be realized, and the risk of direct-current bipolar locking is reduced.
Drawings
In order to more clearly illustrate the technical features of the embodiments of the present invention, the drawings needed to be used in the embodiments of the present invention will be briefly described below, and it is apparent that the drawings described below are only some embodiments of the present invention, and it is obvious for those skilled in the art that other drawings can be obtained based on the drawings without inventive labor.
FIG. 1 is a schematic flow chart diagram of a bipolar power balance control method according to a preferred embodiment of the present invention;
fig. 2 is a schematic structural diagram of a bipolar power balance control device according to a preferred embodiment of the present invention.
Detailed Description
In order to clearly understand the technical features, objects and effects of the present invention, the following detailed description of the embodiments of the present invention is provided with reference to the accompanying drawings and examples. The following examples are intended to illustrate the invention, but are not intended to limit the scope of the invention. Other embodiments, which can be derived by those skilled in the art from the embodiments of the present invention without inventive step, shall fall within the scope of the present invention.
In the description of the present invention, it should be understood that the numbers themselves, such as "first", "second", etc., are used only for distinguishing the described objects, do not have a sequential or technical meaning, and cannot be understood as defining or implying the importance of the described objects.
Fig. 1 is a schematic flow chart of a bipolar power balance control method according to a preferred embodiment of the present invention.
As shown in fig. 1, the control method includes:
acquiring the operation mode of the three-terminal direct-current power transmission system; and
and performing bipolar power balance on the three-terminal direct-current power transmission system according to the operation mode.
The control method is applied to a three-terminal direct-current transmission system, and the three-terminal direct-current transmission system comprises a first converter station, a second converter station and a third converter station.
Specifically, the bipolar power balance control method provided by the invention can be specifically realized by the following steps:
s1: acquiring the operation mode of the three-terminal direct-current power transmission system;
s2: when the operation mode is a first operation mode, judging which converter station needs to carry out bipolar power balance; wherein the first operating mode is: the working modes of the first converter station and the second converter station are a rectification mode, and the working mode of the third converter station is an inversion mode;
s3: when the first converter station needs to perform bipolar power balance, setting Iref _ a1_ new to Iref _ a2_ new to min { Iref _ a1_ old, Iref _ a2_ old }, and ending; iref _ a1_ new is a current reference value after the bipolar power balance of the pole 1 of the first converter station, Iref _ a2_ new is a current reference value after the bipolar power balance of the pole 2 of the first converter station, Iref _ a1_ old is a current reference value before the bipolar power balance of the pole 1 of the first converter station, and Iref _ a2_ old is a current reference value before the bipolar power balance of the pole 2 of the first converter station;
s4: when the second converter station needs to perform bipolar power balance, setting Iref _ B1_ new to Iref _ B2_ new to min { Iref _ B1_ old, Iref _ B2_ old }, and ending; iref _ B1_ new is a current reference value after the bipolar power balance is performed on the pole 1 of the second converter station, Iref _ B2_ new is a current reference value after the bipolar power balance is performed on the pole 2 of the second converter station, Iref _ B1_ old is a current reference value before the bipolar power balance is performed on the pole 1 of the second converter station, and Iref _ B2_ old is a current reference value before the bipolar power balance is performed on the pole 2 of the second converter station;
s5: when the third converter station needs to perform bipolar power balance, determining operation modes of the first converter station, the second converter station and the third converter station, if the first converter station, the second converter station and the third converter station all operate in bipolar mode, executing step S51, if the first converter station and the second converter station operate in unipolar mode and the third converter station operates in bipolar mode, executing step S51, if one of the converter stations in a rectification mode operates in unipolar mode, and the other converter station in the rectification mode and the third converter station operate in bipolar mode, executing step S52;
s51: comparing the magnitude relation between Iact _ C2 and Iact _ C1, executing step S512 when Iact _ C2 is larger than or equal to Iact _ C1, and executing step S511 when Iact _ C2 is smaller than Iact _ C1; wherein Iact _ C1 is the actual current before bipolar power balancing of the pole 1 of the third converter station, Iact _ C2 is the actual current before bipolar power balancing of the pole 2 of the third converter station;
s511: setting Iref _ B1_ new to Iref _ B1_ old-abs (Iact _ C2-Iact _ C1), comparing the size relationship of Iref _ B1_ new and Imin _ B1, if Iref _ B1_ new is less than Imin _ B1, setting Iref _ A1_ new to Iref _ A1_ old- [ abs (Iact _ C2-Iact _ C1) - (Iref _ B1_ old-Imin _ B1) ], and ending if Iref _ B1_ new > Imin _ B1; wherein Imin _ B1 is the minimum allowable operating current value for pole 1 of the second converter station;
s512: setting Iref _ B2_ new to Iref _ B2_ old-abs (Iact _ C2-Iact _ C1), comparing the size relationship of Iref _ B2_ new and Imin _ B2, if Iref _ B2_ new is less than Imin _ B2, setting Iref _ A2_ new to Iref _ A2_ old- [ abs (Iact _ C2-Iact _ C1) - (Iref _ B2_ old-Imin _ B2) ], and ending if Iref _ B2_ new > Imin _ B2; wherein Imin _ B2 is the minimum allowable operating current value for pole 1 of the second converter station;
s52: determining which of the two poles is non-three-terminal operation, if the pole is pole 1, executing step S521, and if the pole is pole 2, executing step S522;
s521: comparing the magnitude relation between Iact _ C1 and Imin _ C2, if Iact _ C1 is less than or equal to Imin _ C2, executing step S5211, and if Iact _ C1 is more than Imin _ C2, executing step S51; wherein Imin _ C2 is the minimum allowable operating current value for pole 2 of the third converter station;
s5211: setting Iref _ a2_ new to Imin _ a2 and Iref _ B2_ new to Imin _ B2, if the second converter station is in bipolar operation, setting Iref _ B1_ new to Imin _ C2, if the first converter station is in bipolar operation, setting Iref _ a1_ new to Imin _ C2, and ending; wherein Imin _ a2 is a minimum allowable operating current value for pole 2 of the first converter station;
s522: comparing the magnitude relation between Iact _ C2 and Imin _ C1, if Iact _ C2 is less than or equal to Imin _ C1, executing step S5221, and if Iact _ C2 is more than Imin _ C1, executing step S51; wherein Imin _ C1 is the minimum allowable operating current value for pole 1 of the third converter station;
s5221: setting Iref _ a1_ new to Imin _ a1 and Iref _ B1_ new to Imin _ B1, if the second converter station is in bipolar operation, setting Iref _ B2_ new to Imin _ C1, if the first converter station is in bipolar operation, setting Iref _ a2_ new to Imin _ C1, and ending; wherein Imin _ a1 is the minimum allowable operating current value for pole 1 of said first converter station.
Further, in this embodiment, when performing bipolar power balance, the priority of power adjustment is further set as: the first converter station A and the third converter station C are adjusted and increased preferentially, and the second converter station B is adjusted and decreased preferentially.
In the first operation mode, the three-terminal direct-current power transmission system can have the following three operation modes: (1) all three stations are bipolar operation; (2) one rectifying station is operated in a unipolar mode, and the other rectifying station and the inverter station are operated in a bipolar mode (for example, the first converter station A is operated in a unipolar mode, and the second converter station B and the third converter station C are operated in a bipolar mode); (3) the two rectifier stations operate in a unipolar mode (non-homopolar), and the inverter stations operate in a bipolar mode. Then, the overall design idea of bipolar power balance of the three stations is as follows:
bipolar power balancing of the first converter station a: only pole 2 power needs to be turned down until equal to pole 1. In this process the second converter station B power remains unchanged and the third converter station C is a voltage control station, the power of which will follow the first converter station a.
Bipolar power balancing of the second converter station B: similar to the bipolar power balance of the first converter station a.
Bipolar power balancing of the third converter station C: the power of the C pole 2 of the third converter station needs to be reduced to be equal to that of the B pole 1, and the power of the B pole 2 of the second converter station is reduced first according to the power adjustment priority. And if the bipolar power balance of the third converter station C cannot be met when the B pole 2 of the second converter station is adjusted to the minimum allowable operating current, the B pole 2 of the second converter station keeps the minimum allowable current to operate, and the power of the A pole 2 of the first converter station is continuously adjusted and reduced until the bipolar power balance of the third converter station C is met.
According to the control method for the bipolar power balance, provided by the embodiment of the invention, the bipolar power balance control of the three-terminal direct-current power transmission system can be realized by acquiring the operation mode of the three-terminal direct-current power transmission system and performing the bipolar power balance on the three-terminal direct-current power transmission system according to the operation mode, and the risk of direct-current bipolar locking is reduced.
In a preferred embodiment, after step S1, the control method further includes:
s6: when the operation mode is a second operation mode, judging which converter station needs to carry out bipolar power balance; wherein the second operating mode is: the working mode of the first converter station is a rectification mode, and the working modes of the second converter station and the third converter station are inversion modes;
s7: when the first converter station needs to perform bipolar power balance, determining operation modes of the first converter station, the second converter station and the third converter station, if the first converter station, the second converter station and the third converter station all operate in bipolar mode, executing step S71, if one of the converter stations in the inversion mode operates in a monopolar mode, and if the other converter station in the inversion mode operates in a bipolar mode and the first converter station operates in a bipolar mode, executing step S72, and if the first converter station operates in bipolar mode and the second converter station and the third converter station operate in a monopolar mode, executing step S71;
s71: comparing the magnitude relation between Iact _ A2 and Iact _ A1, executing step S712 when Iact _ A2 is not less than Iact _ A1, and executing step S711 when Iact _ A2 is less than Iact _ A1; wherein Iact _ a1 is the actual current before bipolar power balancing of pole 1 of the first converter station and Iact _ a2 is the actual current before bipolar power balancing of pole 2 of the first converter station;
s711: iref _ a1_ new is set to Iref _ a1_ old-abs (Iact _ a2-Iact _ a1), Iref _ B1_ new is set to Iref _ B1_ old-abs (Iact _ a2-Iact _ a 1); meanwhile, the sizes of Iref _ B1_ new and Imin _ B1 are judged, and if Iref _ B1_ new is not less than Imin _ B1, the operation is ended; if Iref _ B1_ new < Imin _ B1, resetting Iref _ B1_ new to Imin _ B1, and ending;
s712: iref _ a2_ new is set to Iref _ a2_ old-abs (Iact _ a2-Iact _ a1), Iref _ B2_ new is set to Iref _ B2_ old-abs (Iact _ a2-Iact _ a 1); meanwhile, the sizes of Iref _ B2_ new and Imin _ B2 are judged, and if Iref _ B2_ new is not less than Imin _ B2, the operation is ended; if Iref _ B2_ new < Imin _ B2, resetting Iref _ B2_ new to Imin _ B2, and ending;
s72: determining which of the two poles is not operated at three ends, if so, executing step S721, and if so, executing step S722;
s721: comparing the magnitude relation between Iact _ A1 and Imin _ A2, if Iact _ A1 is less than or equal to Imin _ A2, executing step S7211, and if Iact _ A1 is more than Imin _ A2, executing step S71;
s7211: setting Iref _ a1_ new to Iref _ a2_ new to Imin _ a2, and if the second converter station operates in bipolar mode, setting Iref _ B2_ new to Imin _ B2, and ending;
s722: comparing the magnitude relation between Iact _ A2 and Imin _ A1, executing step S7221 if Iact _ A2 is less than or equal to Imin _ A1, and executing step S71 if Iact _ A2 is more than Imin _ A1;
s7221: setting Iref _ a2_ new to Iref _ a1_ new to Imin _ a1, and if the second converter station operates in bipolar mode, setting Iref _ B1_ new to Imin _ B1, and ending;
s8: when the second converter station needs to perform bipolar power balance, setting Iref _ B1_ new to Iref _ B2_ new to min { Iref _ B1_ old, Iref _ B2_ old }, comparing the magnitude relationship between Iact _ B2 and Iact _ B1, executing step S81 when Iact _ B2 is greater than Iact _ B1, and executing step S82 when Iact _ B2 is less than or equal to Iact _ B1; wherein Iact _ B1 is the actual current before bipolar power balancing of the pole 1 of the second converter station, Iact _ B2 is the actual current before bipolar power balancing of the pole 2 of the second converter station;
s81: setting Iref _ A2_ new as Iref _ A2_ old-abs (Iact _ B2-Iact _ B1), and ending;
s82: setting Iref _ A1_ new as Iref _ A1_ old-abs (Iact _ B2-Iact _ B1), and ending;
s9: when the third converter station needs to carry out bipolar power balance, comparing the magnitude relation between Iact _ C2 and Iact _ C1, if Iact _ C2 is greater than Iact _ C1, executing step S91, and if Iact _ C2 is less than or equal to Iact _ C1, executing step S92;
s91: setting Iref _ A2_ new as Iref _ A2_ old-abs (Iact _ C2-Iact _ C1), and ending;
s92: iref _ a1_ new is set to Iref _ a1_ old-abs (Iact _ C2-Iact _ C1), and the process ends.
In the second operation mode, the three-terminal direct-current power transmission system can have the following three operation modes: (1) all three stations are bipolar operation; (2) one inverter station is operated in a unipolar mode, and the other inverter station and the rectifier station are operated in a bipolar mode (for example, the third converter station C is operated in a unipolar mode, and the first converter station A and the second converter station B are operated in a bipolar mode); (3) the two inversion stations operate in a unipolar mode (non-homopolar), and the rectification station operates in a bipolar mode. Then, the overall design idea of bipolar power balance of the three stations is as follows:
bipolar power balancing of the second converter station B: only the power of the first converter A pole 2 of the station needs to be reduced until the power of the second converter B pole 2 of the station is equal to the power of the pole 1. The third converter station C power remains unchanged during this process.
Bipolar power balancing of the third converter station C: similar to the bipolar power balance of the second converter station B.
Bipolar power balancing of the first converter station a: the power of the pole 2 of the first converter station a needs to be reduced to be equal to that of the pole 1, and the power of the pole 2 of the second converter station B needs to be reduced first according to the power adjustment priority. And if the bipolar power balance of the first converter station A cannot be met when the B pole 2 of the second converter station is adjusted to the minimum allowable operating current, the B pole 2 of the second converter station keeps the minimum allowable current to operate, and the power of the C pole 2 of the third converter station is continuously adjusted and reduced until the bipolar power balance of the first converter station A is met.
In addition, for a specific case of the operating mode (2) in the first operating mode and the second operating mode, additional considerations are required: when the rated power of the three stations is the same (Sbase _ a ═ Sbase _ B ═ Sbase _ C), the minimum allowable operating current of each converter of the three stations is the same. However, in a three-terminal dc transmission system, since there must be a single terminal operation mode (hereinafter, referred to as a single terminal, such as the third converter station C in the first operation mode or the first converter station a in the second operation mode), in the control protection system current controller, the minimum allowable operation current of the single terminal is equal to the sum of the minimum allowable operation currents of the other two terminals, that is: imin _ C is Imin _ a + Imin _ B or Imin _ a is Imin _ B + Imin _ C.
If the three-terminal dc initial operation condition is as follows, and assume Sbase _ a ═ Sbase _ B ═ Sbase _ C ═ 3000A, and Imin _ a ═ Imin _ B ═ 300A.
And when the third converter station C needs to carry out power balance, preferentially reducing the current of the second converter B pole 2 of the station, and continuously reducing the current of the first converter station A pole 2 to the minimum allowable operating current after the current of the second converter B pole reaches the minimum allowable operating current 300A. But at this time the third converter station C still cannot reach the bipolar power balance as shown in the table below.
And if the power balance of the third converter station C needs to be realized, the power of the C pole 1 of the third converter station is regulated to 600A.
According to the control method for the bipolar power balance, provided by the embodiment of the invention, the bipolar power balance control of the three-terminal direct-current power transmission system can be realized by acquiring the operation mode of the three-terminal direct-current power transmission system and performing the bipolar power balance on the three-terminal direct-current power transmission system according to the operation mode, the risk of direct-current bipolar locking is reduced, and the bipolar power balance can be realized when the asymmetrical three terminals operate.
It should be understood that all or part of the processes in the above bipolar power balance control method may also be implemented by a computer program, which may be stored in a computer readable storage medium and used by a processor to implement the steps of the above bipolar power balance control method. Wherein the computer program comprises computer program code, which may be in the form of source code, object code, an executable file or some intermediate form, etc. The computer readable medium may include: any entity or device capable of carrying the computer program code, recording medium, usb disk, removable hard disk, magnetic disk, optical disk, computer Memory, Read-Only Memory (ROM), Random Access Memory (RAM), electrical carrier wave signals, telecommunications signals, software distribution medium, and the like. It should be noted that the computer readable medium may contain other components which may be suitably increased or decreased as required by legislation and patent practice in jurisdictions, for example, in some jurisdictions, in accordance with legislation and patent practice, the computer readable medium does not include electrical carrier signals and telecommunications signals.
Fig. 2 is a schematic structural diagram of a bipolar power balance control device according to a preferred embodiment of the present invention, which is capable of implementing all the processes of the bipolar power balance control method according to any one of the above embodiments and achieving the corresponding technical effects.
As shown in fig. 2, the control device includes:
a memory 21 for storing a computer program;
a processor 22 for executing the computer program;
wherein the memory 21 stores therein a computer program configured to be executed by the processor 22, and when being executed by the processor 22, the method for controlling bipolar power balance according to any of the above embodiments is implemented
Illustratively, the computer program may be divided into one or more modules/units, which are stored in the memory 21 and executed by the processor 22 to accomplish the present invention. The one or more modules/units may be a series of computer program instruction segments capable of performing specific functions, which are used to describe the execution of the computer program in the control apparatus.
The Processor 22 may be a Central Processing Unit (CPU), other general purpose Processor, a Digital Signal Processor (DSP), an Application Specific Integrated Circuit (ASIC), a Field Programmable Gate Array (FPGA) or other Programmable logic device, discrete Gate or transistor logic, discrete hardware components, etc. A general purpose processor may be a microprocessor or the processor may be any conventional processor or the like.
The memory 21 may be used to store the computer programs and/or modules, and the processor 22 implements various functions of the control device by running or executing the computer programs and/or modules stored in the memory 21 and calling data stored in the memory 21. The memory 21 may mainly include a storage program area and a storage data area, wherein the storage program area may store an operating system, an application program required by at least one function (such as a sound playing function, an image playing function, etc.), and the like; the storage data area may store data (such as audio data, a phonebook, etc.) created according to the use of the cellular phone, and the like. In addition, the memory 21 may include a high speed random access memory, and may also include a non-volatile memory, such as a hard disk, a memory, a plug-in hard disk, a Smart Media Card (SMC), a Secure Digital (SD) Card, a Flash memory Card (Flash Card), at least one magnetic disk storage device, a Flash memory device, or other volatile solid state storage device.
It should be noted that the above-mentioned control device includes, but is not limited to, a processor and a memory, and those skilled in the art will understand that the structural diagram of fig. 2 is only an example of the above-mentioned control device, and does not constitute a limitation on the control device, and may include more components than those shown in the figure, or may combine some components, or may be different components.
The above description is only a preferred embodiment of the present invention, but the scope of the present invention is not limited thereto, and it should be noted that, for those skilled in the art, several equivalent obvious modifications and/or equivalent substitutions can be made without departing from the technical principle of the present invention, and these obvious modifications and/or equivalent substitutions should also be regarded as the scope of the present invention.
Claims (4)
1. A bipolar power balance control method is applied to a three-terminal direct current transmission system, wherein the three-terminal direct current transmission system comprises a first converter station, a second converter station and a third converter station, and the method comprises the following steps:
s1: acquiring the operation mode of the three-terminal direct-current power transmission system;
s2: when the operation mode is a first operation mode, judging which converter station needs to carry out bipolar power balance; wherein the first operating mode is: the working modes of the first converter station and the second converter station are a rectification mode, and the working mode of the third converter station is an inversion mode;
s3: when the first converter station needs to perform bipolar power balance, setting Iref _ a1_ new to Iref _ a2_ new to min { Iref _ a1_ old, Iref _ a2_ old }, and ending; iref _ a1_ new is a current reference value after the bipolar power balance of the pole 1 of the first converter station, Iref _ a2_ new is a current reference value after the bipolar power balance of the pole 2 of the first converter station, Iref _ a1_ old is a current reference value before the bipolar power balance of the pole 1 of the first converter station, and Iref _ a2_ old is a current reference value before the bipolar power balance of the pole 2 of the first converter station;
s4: when the second converter station needs to perform bipolar power balance, setting Iref _ B1_ new to Iref _ B2_ new to min { Iref _ B1_ old, Iref _ B2_ old }, and ending; iref _ B1_ new is a current reference value after the bipolar power balance is performed on the pole 1 of the second converter station, Iref _ B2_ new is a current reference value after the bipolar power balance is performed on the pole 2 of the second converter station, Iref _ B1_ old is a current reference value before the bipolar power balance is performed on the pole 1 of the second converter station, and Iref _ B2_ old is a current reference value before the bipolar power balance is performed on the pole 2 of the second converter station;
s5: when the third converter station needs to perform bipolar power balance, determining operation modes of the first converter station, the second converter station and the third converter station, if the first converter station, the second converter station and the third converter station all operate in bipolar mode, executing step S51, if the first converter station and the second converter station operate in unipolar mode and the third converter station operates in bipolar mode, executing step S51, if one of the converter stations in a rectification mode operates in unipolar mode, and the other converter station in the rectification mode and the third converter station operate in bipolar mode, executing step S52;
s51: comparing the magnitude relation between Iact _ C2 and Iact _ C1, executing step S512 when Iact _ C2 is larger than or equal to Iact _ C1, and executing step S511 when Iact _ C2 is smaller than Iact _ C1; wherein Iact _ C1 is the actual current before bipolar power balancing of the pole 1 of the third converter station, Iact _ C2 is the actual current before bipolar power balancing of the pole 2 of the third converter station;
s511: setting Iref _ B1_ new to Iref _ B1_ old-abs (Iact _ C2-Iact _ C1), comparing the size relationship of Iref _ B1_ new and Imin _ B1, if Iref _ B1_ new is less than Imin _ B1, setting Iref _ A1_ new to Iref _ A1_ old- [ abs (Iact _ C2-Iact _ C1) - (Iref _ B1_ old-Imin _ B1) ], and ending if Iref _ B1_ new > Imin _ B1; wherein Imin _ B1 is the minimum allowable operating current value for pole 1 of the second converter station;
s512: setting Iref _ B2_ new to Iref _ B2_ old-abs (Iact _ C2-Iact _ C1), comparing the size relationship of Iref _ B2_ new and Imin _ B2, if Iref _ B2_ new is less than Imin _ B2, setting Iref _ A2_ new to Iref _ A2_ old- [ abs (Iact _ C2-Iact _ C1) - (Iref _ B2_ old-Imin _ B2) ], and ending if Iref _ B2_ new > Imin _ B2; wherein Imin _ B2 is the minimum allowable operating current value for pole 1 of the second converter station;
s52: determining which of the two poles is non-three-terminal operation, if the pole is pole 1, executing step S521, and if the pole is pole 2, executing step S522;
s521: comparing the magnitude relation between Iact _ C1 and Imin _ C2, if Iact _ C1 is less than or equal to Imin _ C2, executing step S5211, and if Iact _ C1 is more than Imin _ C2, executing step S51; wherein Imin _ C2 is the minimum allowable operating current value for pole 2 of the third converter station;
s5211: setting Iref _ a2_ new to Imin _ a2 and Iref _ B2_ new to Imin _ B2, if the second converter station is in bipolar operation, setting Iref _ B1_ new to Imin _ C2, if the first converter station is in bipolar operation, setting Iref _ a1_ new to Imin _ C2, and ending; wherein Imin _ a2 is a minimum allowable operating current value for pole 2 of the first converter station;
s522: comparing the magnitude relation between Iact _ C2 and Imin _ C1, if Iact _ C2 is less than or equal to Imin _ C1, executing step S5221, and if Iact _ C2 is more than Imin _ C1, executing step S51; wherein Imin _ C1 is the minimum allowable operating current value for pole 1 of the third converter station;
s5221: setting Iref _ a1_ new to Imin _ a1 and Iref _ B1_ new to Imin _ B1, if the second converter station is in bipolar operation, setting Iref _ B2_ new to Imin _ C1, if the first converter station is in bipolar operation, setting Iref _ a2_ new to Imin _ C1, and ending; wherein Imin _ a1 is the minimum allowable operating current value for pole 1 of said first converter station.
2. The bipolar power balance control method according to claim 1, wherein after step S1, the method further comprises:
s6: when the operation mode is a second operation mode, judging which converter station needs to carry out bipolar power balance; wherein the second operating mode is: the working mode of the first converter station is a rectification mode, and the working modes of the second converter station and the third converter station are inversion modes;
s7: when the first converter station needs to perform bipolar power balance, determining operation modes of the first converter station, the second converter station and the third converter station, if the first converter station, the second converter station and the third converter station all operate in bipolar mode, executing step S71, if one of the converter stations in the inversion mode operates in a monopolar mode, and if the other converter station in the inversion mode operates in a bipolar mode and the first converter station operates in a bipolar mode, executing step S72, and if the first converter station operates in bipolar mode and the second converter station and the third converter station operate in a monopolar mode, executing step S71;
s71: comparing the magnitude relation between Iact _ A2 and Iact _ A1, executing step S712 when Iact _ A2 is not less than Iact _ A1, and executing step S711 when Iact _ A2 is less than Iact _ A1; wherein Iact _ a1 is the actual current before bipolar power balancing of pole 1 of the first converter station and Iact _ a2 is the actual current before bipolar power balancing of pole 2 of the first converter station;
s711: iref _ a1_ new is set to Iref _ a1_ old-abs (Iact _ a2-Iact _ a1), Iref _ B1_ new is set to Iref _ B1_ old-abs (Iact _ a2-Iact _ a 1); meanwhile, the sizes of Iref _ B1_ new and Imin _ B1 are judged, and if Iref _ B1_ new is not less than Imin _ B1, the operation is ended; if Iref _ B1_ new < Imin _ B1, resetting Iref _ B1_ new to Imin _ B1, and ending;
s712: iref _ a2_ new is set to Iref _ a2_ old-abs (Iact _ a2-Iact _ a1), Iref _ B2_ new is set to Iref _ B2_ old-abs (Iact _ a2-Iact _ a 1); meanwhile, the sizes of Iref _ B2_ new and Imin _ B2 are judged, and if Iref _ B2_ new is not less than Imin _ B2, the operation is ended; if Iref _ B2_ new < Imin _ B2, resetting Iref _ B2_ new to Imin _ B2, and ending;
s72: determining which of the two poles is not operated at three ends, if so, executing step S721, and if so, executing step S722;
s721: comparing the magnitude relation between Iact _ A1 and Imin _ A2, if Iact _ A1 is less than or equal to Imin _ A2, executing step S7211, and if Iact _ A1 is more than Imin _ A2, executing step S71;
s7211: setting Iref _ a1_ new to Iref _ a2_ new to Imin _ a2, and if the second converter station operates in bipolar mode, setting Iref _ B2_ new to Imin _ B2, and ending;
s722: comparing the magnitude relation between Iact _ A2 and Imin _ A1, executing step S7221 if Iact _ A2 is less than or equal to Imin _ A1, and executing step S71 if Iact _ A2 is more than Imin _ A1;
s7221: setting Iref _ a2_ new to Iref _ a1_ new to Imin _ a1, and if the second converter station operates in bipolar mode, setting Iref _ B1_ new to Imin _ B1, and ending;
s8: when the second converter station needs to perform bipolar power balance, setting Iref _ B1_ new to Iref _ B2_ new to min { Iref _ B1_ old, Iref _ B2_ old }, comparing the magnitude relationship between Iact _ B2 and Iact _ B1, executing step S81 when Iact _ B2 is greater than Iact _ B1, and executing step S82 when Iact _ B2 is less than or equal to Iact _ B1; wherein Iact _ B1 is the actual current before bipolar power balancing of the pole 1 of the second converter station, Iact _ B2 is the actual current before bipolar power balancing of the pole 2 of the second converter station;
s81: setting Iref _ A2_ new as Iref _ A2_ old-abs (Iact _ B2-Iact _ B1), and ending;
s82: setting Iref _ A1_ new as Iref _ A1_ old-abs (Iact _ B2-Iact _ B1), and ending;
s9: when the third converter station needs to carry out bipolar power balance, comparing the magnitude relation between Iact _ C2 and Iact _ C1, if Iact _ C2 is greater than Iact _ C1, executing step S91, and if Iact _ C2 is less than or equal to Iact _ C1, executing step S92;
s91: setting Iref _ A2_ new as Iref _ A2_ old-abs (Iact _ C2-Iact _ C1), and ending;
s92: iref _ a1_ new is set to Iref _ a1_ old-abs (Iact _ C2-Iact _ C1), and the process ends.
3. A bipolar power balance control apparatus, comprising:
a memory for storing a computer program;
a processor for executing the computer program;
wherein the processor, when executing the computer program, implements the method of controlling bipolar power balancing according to any one of claims 1 to 2.
4. A computer-readable storage medium, characterized in that the computer-readable storage medium stores a computer program which, when executed, implements the control method of bipolar power balancing according to any one of claims 1 to 2.
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