CN112290578B - Interpolar power compensation control method for high-voltage direct current feed-in weak system - Google Patents
Interpolar power compensation control method for high-voltage direct current feed-in weak system Download PDFInfo
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- CN112290578B CN112290578B CN202011556538.2A CN202011556538A CN112290578B CN 112290578 B CN112290578 B CN 112290578B CN 202011556538 A CN202011556538 A CN 202011556538A CN 112290578 B CN112290578 B CN 112290578B
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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
- H02J3/007—Arrangements for selectively connecting the load or loads to one or several among a plurality of power lines or power sources
- H02J3/0073—Arrangements for selectively connecting the load or loads to one or several among a plurality of power lines or power sources for providing alternative feeding paths between load and source when the main path fails, e.g. transformers, busbars
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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
- H02J2203/00—Indexing scheme relating to details of circuit arrangements for AC mains or AC distribution networks
- H02J2203/20—Simulating, e g planning, reliability check, modelling or computer assisted design [CAD]
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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]
Abstract
A method for interpolar power compensation control of a high voltage direct current fed weak system, the method comprising: performing logic relation judgment according to the bipolar power control mode signal of the antipole, the running state signal of the antipole and the bipolar power control mode signal of the local pole, so as to determine the final value of the power instruction value; and switching and judging the undetermined speed and the first lifting speed according to the bipolar power control mode signal of the antipole to obtain a final lifting speed instruction value. By the method provided by the embodiment of the invention, the judgment signal in a non-communication and non-operation state is added, the low-voltage protection delay is avoided, and the pole can quickly judge the pole-to-pole fault shutdown and execute the inter-pole power transfer under the condition of losing the inter-station communication; when the direct current line between stations is lost and emergency phase shifting is needed, the power transfer speed of the sound pole is accelerated.
Description
Technical Field
The invention relates to the field of high-voltage direct-current transmission system control, in particular to a method for controlling interpolar power compensation of a high-voltage direct-current feed-in weak system.
Background
With the commissioning of a large-capacity extra-high voltage direct current transmission project and the clustered access of new energy power generation, a power grid in China presents a pattern that a large-scale energy base supplies power to a load center through the extra-high voltage direct current transmission project. As the dc transmission capacity is greatly increased, the receiving-end grid presents a weakly supported grid characteristic, and it is urgently needed to optimize the converter station control strategy to deal with the challenges faced by feeding dc into the weak system.
In the existing ultrahigh voltage direct current pole control link in China, under the conditions that an inverter station is shut down and locked and inter-station communication is lost, a rectifier station fault pole cannot be locked immediately, and low voltage protection of the rectifier station fault pole needs to delay hundreds of milliseconds to send a locking instruction, so that serious power shortage occurs in an alternating current power grid, and safety control action load shedding occurs.
Disclosure of Invention
In view of this, the present invention provides a method for inter-electrode power compensation control of a high voltage direct current fed-in weak system, and aims to solve the problem of too low power transfer speed in the related art.
In a first aspect, an embodiment of the present invention provides a method for inter-electrode power compensation control of a high-voltage direct-current fed-in weak system, including: acquiring a bipolar power control mode signal of an antipode, an operating state signal of the antipode and a bipolar power control mode signal of a local pole; performing first logic relation judgment according to the bipolar power control mode signal of the antipole, the running state signal of the antipole and the bipolar power control mode signal of the local pole to obtain a first judgment signal of the local pole, performing switching judgment on a first numerical value and a second numerical value according to the first judgment signal of the local pole to obtain the first numerical value or the second numerical value as a final numerical value, and calculating according to the final numerical value and total power to obtain a power instruction value of the local pole; switching and judging the undetermined speed of the local pole and the first lifting speed of the local pole according to the bipolar power control mode signal of the opposite pole to obtain a final lifting speed instruction value of the local pole; the undetermined speed of the local pole is the switching judgment result of the first lifting speed of the local pole and the second lifting speed of the local pole; and performing interelectrode power compensation control on the local pole according to the power command value of the local pole and the final lifting speed command value of the local pole.
Further, the operating state signal of the counter electrode is obtained by the following method: acquiring a normal communication signal of an opposite pole and a non-communication non-running state signal of the opposite pole; performing NOT gate judgment on the communication normal signal of the opposite pole to obtain a reverse signal of the communication normal signal of the opposite pole; and performing AND gate judgment according to the reverse signal of the communication normal signal of the antipode and the no-communication no-operation state signal of the antipode to obtain a second judgment signal of the local pole, and controlling the switching of the operation state signal of the antipode according to the second judgment signal of the local pole.
Further, performing a first logic relationship determination according to the bipolar power control mode signal of the antipole, the operating state signal of the antipole, and the bipolar power control mode signal of the local pole to obtain a first determination signal, performing a switching determination on the first value and the second value according to the first determination signal of the local pole to obtain the first value or the second value as a final value, including: and performing AND gate judgment on the bipolar power control mode signal of the antipole, the running state signal of the antipole and the bipolar power control mode signal of the local pole to obtain a first judgment signal of the local pole, and controlling the switching between the first numerical value and the second numerical value according to the first judgment signal of the local pole.
Further, the undetermined rate of the local pole is obtained by adopting the following method: acquiring a communication normal signal of an antipode, an operation state signal of the antipode and an original judgment logic signal; performing NOT gate judgment on the operation state signal of the antipode to obtain a reverse signal of the operation state signal of the antipode; carrying out OR gate judgment according to the reverse signal of the operation state signal of the antipode and the communication normal signal of the antipode to obtain a third judgment signal of the local pole; and performing AND gate judgment according to the third judgment signal of the local pole and the original judgment logic signal to obtain a fourth judgment signal of the local pole, and performing switching judgment on the first lifting speed of the local pole and the second lifting speed of the local pole according to the fourth judgment signal of the local pole to obtain the undetermined speed of the local pole.
Further, the switching determination of the first lifting rate of the local pole and the second lifting rate of the local pole according to the fourth determination signal of the local pole to obtain the undetermined rate of the local pole includes: if the value of the fourth determination signal of the local pole is a true value, switching to a second lifting speed of the local pole; otherwise, the first lifting speed of the local pole is maintained.
Further, the switching and determining the undetermined speed of the local pole and the first lifting speed of the local pole according to the bipolar power control mode signal of the opposite pole to obtain a final lifting speed instruction value of the local pole includes: if the value of the bipolar power control mode signal of the antipole is a true value, switching to the undetermined rate of the antipole; otherwise, the first lifting speed of the local pole is maintained.
Further, the non-communication non-operation state signal of the counter electrode is obtained by the counter electrode through the following modes: acquiring the voltage of a direct current line of an antipode, the voltage of a neutral line of the antipode, a communication normal signal of the antipode and a line fault phase-shifting signal of the antipode; carrying out antipodal first fault judgment on the basis of the direct-current line voltage of the antipodal and the neutral line voltage of the antipodal to obtain an antipodal first judgment signal, carrying out antipodal second fault judgment on the basis of the antipodal communication normal signal to obtain an antipodal second judgment signal, and carrying out antipodal third fault judgment on the basis of the antipodal line fault phase shift signal to obtain an antipodal third judgment signal; and carrying out logic relation judgment based on the first judgment signal of the antipode, the second judgment signal of the antipode and the third judgment signal of the antipode, and obtaining a no-communication no-operation state signal of the antipode according to a judgment result.
Further, the performing a first fault determination of the antipole based on the dc line voltage of the antipole and the neutral line voltage of the antipole to obtain a first determination signal of the antipole includes: calculating the difference value of the voltage of the direct current line of the antipole and the voltage of the neutral line of the antipole to obtain a direct current voltage measured value of the antipole; if the antipode is the positive electrode, judging whether the direct-current voltage measured value of the antipode is smaller than a first preset value: if yes, indicating that a first type fault of the antipode occurs by the first judging signal of the antipode; otherwise, the first judgment signal of the antipodal indicates that the first type fault of the antipodal does not occur; if the antipode is a negative electrode, judging whether the direct-current voltage measured value of the antipode is greater than a second preset value: if yes, indicating that a first type fault of the antipode occurs by the first judging signal of the antipode; otherwise the first decision signal for the antipodal indicates that no fault of the first type of antipodal has occurred.
Further, the determining a second fault of the antipole based on the communication normal signal of the antipole to obtain a second determination signal of the antipole includes: and performing NOT gate judgment on the communication normal signal of the antipode to obtain a second judgment signal of the antipode so as to indicate whether a second type fault of the antipode occurs.
Further, the third fault determination of the antipole based on the line fault phase shift signal of the antipole to obtain a third determination signal of the antipole includes: and performing NOT gate judgment on the line fault phase-shifting signal of the antipole to obtain a third judgment signal of the antipole so as to indicate whether a third type fault of the antipole occurs.
Further, the logic relationship determination is performed based on the first determination signal of the antipode, the second determination signal of the antipode, and the third determination signal of the antipode, and according to the determination result, the obtaining of the no-communication no-operation state signal of the antipode includes: if the first determination signal of the antipode, the second determination signal of the antipode and the third determination signal of the antipode indicate that a fault occurs, the non-communication non-operation state signal of the antipode indicates that the antipode is in a non-communication non-operation state; otherwise, the no-communication no-operation state signal of the opposite pole indicates that the opposite pole is not in the no-communication no-operation state.
Further, after obtaining the no-communication no-operation state signal of the opposite pole, the method includes: and controlling the switching of the bipolar power control mode signal of the opposite pole according to the non-communication non-operation state signal of the opposite pole.
In a second aspect, an embodiment of the present invention further provides a system for inter-electrode power compensation control of a high-voltage direct-current fed-in weak system, including: the first pole is used for determining a non-communication non-operation state signal and a bipolar power control mode signal by adopting the method provided by each embodiment, and sending the non-communication non-operation state signal, the bipolar power control mode signal, a communication normal signal, a line fault phase-shifting signal and an operation state signal to the second pole; and the second pole is used for receiving the no-communication no-operation state signal, the bipolar power control mode signal, the communication normal signal, the line fault phase shift signal and the operation state signal sent by the first pole, and performing inter-pole power compensation control by adopting the method provided by each embodiment.
The method for controlling the interelectrode power compensation of the high-voltage direct-current feed-in weak system provided by the embodiment of the invention is optimized on the basis of the original interelectrode power control link, a judgment signal in a communication-free and operation-free state is added, low-voltage protection delay is avoided, and the interelectrode power compensation method can quickly judge that the antipodal fault is stopped and execute interelectrode power transfer under the condition of losing interstation communication; when the opposite pole fails and needs emergency phase shift, the power transfer speed of the sound pole is accelerated. Through the embodiment, the problem that power transfer is too slow when the high-voltage direct current is connected into the weak alternating current system can be solved, and stable operation of the alternating current/direct current system is guaranteed.
According to the method for determining the signal without the communication running state, provided by the embodiment of the invention, the non-communication pole judgment is carried out through the voltage of a direct current line, the voltage of a neutral line and a communication normal signal, when the communication between stations is lost and an inverter station breaks down to cause an emergency shutdown, a rectifier station can quickly judge the state at the moment, and a judgment logic of the signal without the communication running state is started; meanwhile, a line fault phase-shifting signal is introduced, so that the judgment logic of a communication-free operation state-free signal is not started when the direct-current voltage is reduced due to the direct-current line fault. By the method of the embodiment, the non-communication non-operation state signal can be determined quickly and accurately.
Drawings
Fig. 1 shows an exemplary flow chart of a method of high voltage direct current fed weak system inter-pole power compensation control according to an embodiment of the present invention;
fig. 2 shows an exemplary decision logic diagram of a method of inter-pole power compensation control of a weak system of a high voltage direct current feed according to an embodiment of the invention;
FIG. 3 illustrates an exemplary flow chart of a method of determining a no communication, no run status signal according to an embodiment of the invention;
FIG. 4 illustrates an exemplary decision logic diagram for a method of determining a no communication, no run status signal according to an embodiment of the invention;
FIG. 5 shows a simulation result scenario of the system provided in accordance with embodiment 1 of the present invention;
FIG. 6 shows simulation result conditions in the absence of communication line fault of the system provided in accordance with embodiment 1 of the present invention;
fig. 7 shows a test wave recording situation provided in embodiment 2 without using the system of the present invention, wherein fig. 7 (a) shows waveforms of a first pole, which are, from top to bottom, a dc voltage, a dc current, a trigger angle, and a bipolar power transmission of a rectifier station, respectively; fig. 7 (b) is a waveform of the second pole, which is the dc voltage, dc current and trigger of the inverter station from top to bottom;
fig. 8 shows a test wave recording situation using the system of the present invention according to embodiment 2 of the present invention, where fig. 8 (a) is a waveform of a first pole, and the waveforms are, from top to bottom, a dc voltage, a dc current, a trigger angle, and a bipolar transmission power of a rectifier station, respectively; fig. 8 (b) shows the waveform of the second pole, which is the dc voltage, dc current and firing angle of the inverter station from top to bottom.
Detailed Description
The exemplary embodiments of the present invention will now be described with reference to the accompanying drawings, however, the present invention may be embodied in many different forms and is not limited to the embodiments described herein, which are provided for complete and complete disclosure of the present invention and to fully convey the scope of the present invention to those skilled in the art. The terminology used in the exemplary embodiments illustrated in the accompanying drawings is not intended to be limiting of the invention. In the drawings, the same units/elements are denoted by the same reference numerals.
Unless otherwise defined, terms (including technical and scientific terms) used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. Further, it will be understood that terms, such as those defined in commonly used dictionaries, should be interpreted as having a meaning that is consistent with their meaning in the context of the relevant art and will not be interpreted in an idealized or overly formal sense.
Fig. 1 shows an exemplary flowchart of a method of inter-pole power compensation control of a high voltage direct current fed weak system according to an embodiment of the present invention.
As shown in fig. 1, the method includes:
step S101: acquiring a bipolar power control mode signal of an antipode, an operating state signal of the antipode and a bipolar power control mode signal of a local pole;
step S102: carrying out first logic relation judgment according to the bipolar power control mode signal of the antipole, the running state signal of the antipole and the bipolar power control mode signal of the antipole to obtain a first judgment signal of the antipole, carrying out switching judgment on a first numerical value and a second numerical value according to the first judgment signal of the antipole to obtain the first numerical value or the second numerical value as a final numerical value, and calculating according to the final numerical value and the total power to obtain a power instruction value of the antipole;
step S103: switching and judging the undetermined speed of the local pole and the first lifting speed of the local pole according to the bipolar power control mode signal of the opposite pole to obtain a final lifting speed instruction value of the local pole; the undetermined speed of the local pole is the switching judgment result of the first lifting speed of the local pole and the second lifting speed of the local pole;
step S104: and performing interelectrode power compensation control on the local pole according to the power command value of the local pole and the final lifting speed command value of the local pole.
In the above embodiment, the first value is 1, which indicates that only one pole is operating, i.e., the opposite pole is in a fault state; the second value is 2, indicating that both poles are running, i.e. the antipole is not faulty. The power command value of the local pole is obtained by dividing the total power by the first numerical value or the second numerical value. Preferably, the first lifting rate of the local pole is 1000000W/min. And respectively carrying out logic judgment in the step S102 and the step S103 to obtain the power instruction of the local pole and the final lifting speed instruction value of the local pole, so as to be used for fast power transfer and realize inter-pole power control.
It should be understood that, in the embodiments of the present invention, signal values of the signals, such as the bipolar power control mode signal of the antipole, the operation state signal of the antipole, the bipolar power control mode signal of the local pole, and the first determination signal of the local pole, may be a true value or a false value, where the true value may represent an outgoing signal, and may be any value, such as 1, 2, 3 … …; the false value may indicate that no signal is being sent and may be a value other than any true value. For convenience of description in the following examples, a true value of 1 and a false value of 0 are selected.
Further, the operation state signal of the counter electrode is obtained by the following method:
acquiring a normal communication signal of an opposite pole and a non-communication non-running state signal of the opposite pole;
performing NOT gate judgment on the communication normal signal of the opposite pole to obtain a reverse signal of the communication normal signal of the opposite pole;
and performing AND gate judgment according to the reverse signal of the communication normal signal of the antipole and the no-communication no-operation state signal of the antipole to obtain a second judgment signal of the local pole, and controlling the switching of the operation state signal of the antipole according to the second judgment signal of the local pole.
Further, the switching of the operation state signal of the counter electrode according to the second determination signal of the present electrode includes:
if the value of the second determination signal of the local pole is 1, switching the current value of the operation state signal of the opposite pole to 0; otherwise, the current value of the antipodal operating state signal is maintained.
Further, the determining a first logical relationship according to the bipolar power control mode signal of the opposite pole, the operating state signal of the opposite pole, and the bipolar power control mode signal of the local pole to obtain a first determination signal of the local pole, and performing a switching determination on the first value and the second value according to the first determination signal of the local pole to obtain the first value or the second value as a final value includes:
and performing AND gate judgment on the bipolar power control mode signal of the opposite pole, the running state signal and the bipolar power control mode signal of the local pole to obtain a first judgment signal of the local pole, and controlling the switching between the first numerical value and the second numerical value according to the first judgment signal of the local pole.
Further, controlling the switching between the first value and the second value according to the first determination signal of the present pole includes:
if the value of the first determination signal of the local pole is 1, switching to a second numerical value; otherwise, maintaining the first value; wherein the second value is 2 and the first value is 1.
Further, the undetermined rate of the electrode is obtained by adopting the following mode:
acquiring a communication normal signal of an antipode, an operation state signal of the antipode and an original judgment logic signal;
performing NOT gate judgment on the operation state signal of the antipode to obtain a reverse signal of the operation state signal of the antipode;
performing OR gate judgment according to the reverse signal of the operation state signal of the antipode and the communication normal signal of the antipode to obtain a third judgment signal of the local pole;
and performing AND gate judgment according to the third judgment signal of the local pole and the original judgment logic signal to obtain a fourth judgment signal of the local pole, and performing switching judgment on the first lifting rate of the local pole and the second lifting rate of the local pole according to the fourth judgment signal of the local pole to obtain the undetermined rate of the local pole.
Further, the switching determination of the first lifting rate of the local pole and the second lifting rate of the local pole according to the fourth determination signal of the local pole to obtain the undetermined rate of the local pole includes:
if the value of the fourth judgment signal of the local pole is a true value, switching to the second lifting speed of the local pole; otherwise, the first lifting speed of the local pole is maintained.
Further, according to the bipolar power control mode signal of the antipole, the undetermined speed of the antipole and the first lifting speed of the antipole are switched and judged to obtain a final lifting speed instruction value of the antipole, including:
if the value of the bipolar power control mode signal of the antipole is a true value, switching to the undetermined rate of the antipole; otherwise, the first lifting speed of the local pole is maintained.
Further, the no-communication no-operation state signal is determined as follows:
acquiring direct-current line voltage, neutral line voltage, communication normal signals and line fault phase-shifting signals;
performing first fault judgment based on the voltage of the direct current line and the voltage of the neutral line to obtain a first judgment signal, performing second fault judgment based on the communication normal signal to obtain a second judgment signal, and performing third fault judgment based on the line fault phase-shifting signal to obtain a third judgment signal;
and performing logic relation judgment based on the first judgment signal, the second judgment signal and the third judgment signal, and obtaining a no-communication no-operation state signal according to a judgment result.
Further, performing a first fault determination based on the dc line voltage and the neutral line voltage, resulting in a first determination signal, comprising:
calculating the difference value of the voltage of the direct current line and the neutral line voltage to obtain a direct current voltage measured value;
if the positive pole is the positive pole, whether the measured value of the direct current voltage is smaller than a first preset value is judged: if yes, the first judging signal indicates that the first type fault occurs; otherwise the first decision signal indicates that the first type of fault has not occurred;
if the pole is a negative pole, whether the direct current voltage measured value is larger than a second preset value is judged: if yes, the first judging signal indicates that the first type fault occurs; otherwise the first decision signal indicates that no fault of the first type has occurred.
Further, performing a second failure determination based on the communication normal signal to obtain a second determination signal, includes:
and performing NOT gate judgment on the communication normal signal to obtain a second judgment signal so as to indicate whether a second type of fault occurs.
Further, a third fault determination is performed based on the line fault phase shift signal to obtain a third determination signal, which includes:
and performing NOT gate judgment on the line fault phase-shifting signal to obtain a third judgment signal to indicate whether a third type of fault occurs.
Further, the logic relationship judgment is performed based on the first judgment signal, the second judgment signal and the third judgment signal, and the no-communication no-operation state signal is obtained according to the judgment result, including:
if the first determination signal, the second determination signal and the third determination signal indicate that a fault occurs, the communication-free operation state signal indicates that the communication-free operation state is in a communication-free operation-free state; otherwise, the no-communication no-operation state signal indicates that the no-communication no-operation state is not set.
Further, the bipolar power control mode signal is determined as follows:
and after the non-communication non-operation state signal is obtained, controlling the switching of the bipolar power control mode signal according to the non-communication non-operation state signal.
Fig. 2 illustrates an exemplary decision logic diagram of a method of inter-pole power control according to an embodiment of the present invention. As shown in fig. 2, the power command value calculation of P2 (pole 2) is performed by and gate determination using the bipolar power control mode signal BC _ ON of P1 (pole 1), the operating state signal OPN _ FOP of P1, and the bipolar power control mode signal BC _ ON of P2. The bipolar power control mode signal BC _ ON of P1 is determined by the no communication no run status signal NOOPN _ NOCOM of P1; the operating state signal OPN _ FOP of P1 is obtained by an and gate determination result of the communication normal signal TCOM _ OK of P1 and the no-communication no-operation state signal noppn _ NOCOM of P1. The ramping power of P2 may be determined (selector selected) by making a switch between 1000000W/min and another branch ramping rate (pending rate) as a bipolar power control mode signal BC _ ON of P1. The other branch up/DOWN rate can be obtained by performing a switching decision at 1000000W/min and a smaller rate controlled independently, the switching decision signal is obtained by performing a logic decision through the communication normal signal TCOM _ OK of P1, the line fault phase shift signal ORD _ DOWN of P1, and the original decision logic signal of P2.
The method for controlling the interelectrode power compensation of the high-voltage direct-current feed-in weak system provided by the embodiment of the invention is optimized on the basis of the original interelectrode power control link, a judgment signal in a communication-free and operation-free state is added, low-voltage protection delay is avoided, and the interelectrode power compensation method can quickly judge that the antipodal fault is stopped and execute interelectrode power transfer under the condition of losing interstation communication; when the opposite pole fails and needs emergency phase shift, the power transfer speed of the sound pole is accelerated. Through the embodiment, the problem that power transfer is too slow when the high-voltage direct current is connected into the weak alternating current system can be solved, and stable operation of the alternating current/direct current system is guaranteed.
Fig. 3 illustrates an exemplary flow chart of a method of determining a no communication, no run status signal according to an embodiment of the invention.
As shown in fig. 3, the method includes:
step S301: and acquiring direct-current line voltage, neutral line voltage, communication normal signals and line fault phase-shifting signals.
In the embodiment of the invention, the direct-current line voltage UDL, the neutral line voltage UDN, the communication normal signal TCOM _ OK and the line fault phase-shifting signal ORD _ DOWN can be directly acquired.
Step S302, including:
step S3021: performing a first fault determination based on the DC line voltage and the neutral line voltage to obtain a first determination signal;
step S3022: performing second fault judgment based on the communication normal signal to obtain a second judgment signal;
step S3023: and performing third fault judgment based on the line fault phase-shifting signal to obtain a third judgment signal.
Steps S3021, S3022 and S3023 are three steps performed in parallel, independent of each other.
Further, step S3021 includes:
calculating the difference value of the voltage of the direct current line and the neutral line voltage to obtain a direct current voltage measured value;
if the positive pole is the positive pole, whether the measured value of the direct current voltage is smaller than a first preset value is judged: if yes, the first judging signal indicates that the first type fault occurs; otherwise the first decision signal indicates that the first type of fault has not occurred;
if the pole is a negative pole, whether the direct current voltage measured value is larger than a second preset value is judged: if yes, the first judging signal indicates that the first type fault occurs; otherwise the first decision signal indicates that no fault of the first type has occurred.
In the embodiment of the invention, if the electrode is the positive electrode, the measured value of the direct current voltage is smaller than the first preset value, the positive electrode is in fault, the value of the first judgment signal is true, otherwise, the positive electrode is not in fault, and the value of the first judgment signal is false. Similarly, if the current pole is a negative pole, the measured value of the direct current voltage is greater than the second preset value, which indicates that the negative pole is in fault, the first determination signal is a true value, otherwise, the negative pole is not in fault, and the value of the first determination signal is a false value.
It should be understood that the value true in various embodiments of the present invention may represent an outgoing signal, and may be any number, such as 1, 2, 3 … …; the false value may indicate that no signal is sent, and may be any value other than the true value, and for convenience of description, the true value is 1 and the false value is 0.
Preferably, the first preset value is 0.3pu and the second preset value is-0.3 pu.
Further, step S3022 includes:
and performing NOT gate judgment on the communication normal signal to obtain a second judgment signal so as to indicate whether a second type of fault occurs.
Further, step S3022 further includes:
and performing NOT gate judgment on the communication normal signal: if the value of the communication normal signal is 0, the value of the second judgment signal is 1, and the occurrence of a second type fault is indicated; otherwise the value of the second decision signal is 0 indicating that no fault of the second type has occurred.
In the embodiment of the invention, if the communication is normal, the value of the communication normal signal TCOM _ OK is 1, and if the communication is abnormal, namely after the communication between stations is lost, the value of the communication normal signal TCOM _ OK is 0. When the communication is abnormal after the communication normal signal TCOM _ OK is gated off, the value of the second determination signal is 1.
Further, step S3023 includes:
and performing NOT gate judgment on the line fault phase-shifting signal to obtain a third judgment signal to indicate whether a third type of fault occurs.
Further, step S3023 further includes:
carrying out NOT gate judgment on the line fault phase-shifting signal: if the value of the line fault phase shift signal is 0, the value of the third judgment signal is 1, and the third type fault is indicated to occur; otherwise the value of the third decision signal is 0 indicating that no fault of the third type has occurred.
In the embodiment of the invention, when there is no communication polar line fault emergency phase shift, the value of the line fault phase shift signal ORD _ DOWN is 1, and after not gating, the value of the third judgment signal is 0. By introducing the line fault phase shift signal ORD _ DOWN, the non-communication no-operation state signal can be guaranteed to be invalid during the emergency phase shift.
Step S303: and performing logic relation judgment based on the first judgment signal, the second judgment signal and the third judgment signal, and obtaining a no-communication no-operation state signal according to a judgment result.
Further, step S303 includes:
if the first determination signal, the second determination signal and the third determination signal all indicate that a fault occurs, the communication-free operation state signal indicates that the communication-free operation state is in a communication-free operation-free state; otherwise, the no-communication no-operation state signal indicates that the no-communication no-operation state is not set.
Further, step S303 further includes:
if the values of the first determination signal, the second determination signal and the third determination signal are all 1, the value of the no-communication no-operation state signal is 1, and the indication is in the no-communication no-operation state; otherwise, the value of the no-communication no-operation state signal is 0, which indicates that the no-communication no-operation state is not in the no-communication no-operation state.
In the embodiment of the invention, the first determination signal, the second determination signal and the third determination signal are subjected to AND gate logic determination, if an AND gate condition is met, the value of the no-communication no-operation state signal is 1, and the no-communication no-operation state is indicated; otherwise, the value of the no-communication no-operation state signal is 0, which indicates that the no-communication no-operation state is not in the no-communication no-operation state.
Fig. 4 illustrates an exemplary decision logic diagram of a method of determining a no communication, no run status signal according to an embodiment of the invention. As shown in fig. 4, a dc voltage measurement value is calculated from the dc line voltage UDL and the neutral line voltage UDN, and a first and gate input signal (first decision signal) is determined according to a threshold range of the dc voltage measurement value; taking a signal obtained by performing not-gate judgment on the communication normal signal TCOM _ OK as a second and-gate input signal (second judgment signal); and taking a signal obtained by performing not gate judgment on the line fault phase shift signal ORD _ DOWN as a third AND gate input signal (third judgment signal), and obtaining a no-communication no-operation state signal NOOPN _ NOCOM according to the three AND gate input signals.
According to the method for determining the signal without the communication running state, provided by the embodiment of the invention, the non-communication pole judgment is carried out through the voltage of a direct current line, the voltage of a neutral line and a communication normal signal, when the communication between stations is lost and an inverter station breaks down to cause an emergency shutdown, a rectifier station can quickly judge the state at the moment, and a judgment logic of the signal without the communication running state is started; meanwhile, a line fault phase-shifting signal is introduced, so that the judgment logic of a communication-free operation state-free signal is not started when the direct-current voltage is reduced due to the direct-current line fault. By the method of the embodiment, the non-communication non-operation state signal can be determined quickly and accurately.
Further, after step S303, the method includes:
and controlling the switching of the bipolar power control mode signal according to the no-communication no-operation state signal.
Further, controlling the switching of the bipolar power control mode signal according to the no-communication no-operation state signal includes:
if the value of the no-communication no-operation state signal is 1, switching the current value of the bipolar power control mode signal to 0; otherwise, the current value of the bipolar power control mode signal is maintained.
In the above embodiment, the non-communication and non-operation state signal is determined, so that the bipolar power control mode signal can be quickly determined, and therefore, a guarantee is provided for the bipolar to immediately select the speed when the power transfer is executed as a large value and accelerate the power transfer speed of the sound pole.
The embodiment of the invention also provides a system for interpolar power compensation control of a high-voltage direct-current feed-in weak system, which comprises the following steps:
the first pole is used for determining a non-communication non-operation state signal and a bipolar power control mode signal by adopting the method provided by each embodiment, and sending the non-communication non-operation state signal, the bipolar power control mode signal, a communication normal signal, a line fault phase-shifting signal and an operation state signal to the second pole;
and the second pole is used for receiving the no-communication no-operation state signal, the bipolar power control mode signal, the communication normal signal, the line fault phase shift signal and the operation state signal sent by the first pole, and performing inter-pole power compensation control by adopting the method provided by each embodiment.
In the embodiment of the present invention, the first pole may be an inverter station, and the second pole may be a rectifier station. By adding non-communication pole judging logic, the rectifier station quickly judges that the inverter station is out of operation due to faults under the condition of losing inter-station communication, and performs inter-pole power transfer; when the direct current line without the communication pole has faults and needs emergency phase shifting, the power transfer speed of the sound pole is accelerated. Through the embodiment, the problem that the stability of the system is influenced by too slow power transfer when the high-voltage direct current is accessed into the weak alternating current system can be solved.
Example 1
A system for controlling the inter-electrode power provided by the embodiment of the invention is established, and a simulation test is carried out under the same condition. Fig. 5 shows a simulation result situation of the system provided according to the embodiment of the present invention. As shown in fig. 5, waveforms in the figure are, from top to bottom, a first pole 1 dc voltage, a dc current, a firing angle, a second pole 2 dc voltage, a dc current, a firing angle, and a bipolar power transmission of the rectifier station in sequence. It can be seen from the figure that 90ms after the first pole 1 of the inverter station is in emergency shutdown, the direct current of the second pole 2 is increased from 0.5pu to 1.0pu, and the power curve shows that 120ms after the fault, the transmission power is restored to 90% of the original power level. Therefore, through optimization of a control link, the fast transfer of sound pole power after the emergency locking of the non-communication pole inverter station is realized.
In order to avoid the logic contradiction generated when emergent phase shifting is caused by the fault of a communication polar line, and complete the second-pole 2 rapid power transfer at the moment to match with the action time of a safety device, ORD _ DOWN signals are introduced to corresponding positions of an optimization strategy for logic judgment, and simulation verification is carried out on the logic. The initial state is consistent with the previous state, after the first pole 1 loses inter-station communication, the transient line ground fault occurs at 5s for 50ms, and the simulation result is shown in fig. 6.
Fig. 6 shows simulation result conditions of the system provided by the embodiment of the invention when no communication polar line fault exists. As shown in fig. 6, during the emergency phase shift of the first pole 1, the power is transferred quickly, and when the line fault is cleared and the restart of the first pole 1 is successful, the power of the second pole 2 is restored to the original level. The interpolar power control provided by the embodiment of the invention has no influence on the rest operation control of the direct current system.
Example 2
A digital-analog hybrid simulation model is established in a digital-analog hybrid simulation laboratory of a power system of a national grid simulation center, an AC/DC primary system establishes a full-digital simulation model in HYPERSI, and a secondary system adopts actual +/-500 kV DC engineering DC control protection equipment based on MACH 2. The test steps are as follows: and D, controlling the direct current bipolar power, transmitting power of 1500MW, and disconnecting the inter-station communication of the pole 1. The inverter station pole 1 simulates a valve short circuit protection trip X lockout.
Fig. 7 shows a test wave recording situation of a system not provided by the embodiment of the present invention, where fig. 7 (a) is a waveform of a first pole, and the waveforms are, from top to bottom, a dc voltage, a dc current, a trigger angle, and a bipolar transmission power of a rectifier station, respectively; fig. 7 (b) shows the waveform of the second pole, which is the dc voltage, dc current and firing angle of the inverter station from top to bottom. As shown in fig. 7, the result is substantially consistent with the offline electromagnetic transient simulation result, and without the system provided by the embodiment of the present invention, the inter-pole power transfer under such a fault condition takes approximately 300ms to complete, which may result in the operation of the stabilizing device.
Fig. 8 shows a test wave recording situation of the system according to the embodiment of the present invention, where fig. 8 (a) shows waveforms of a first pole, where the waveforms are, from top to bottom, a dc voltage, a dc current, a trigger angle, and a bipolar transmission power of a rectifier station, respectively; fig. 8 (b) shows the waveform of the second pole, which is the dc voltage, dc current and firing angle of the inverter station from top to bottom. As shown in fig. 8, the power transfer time is shortened to about 110ms, which verifies the effectiveness of the system of the embodiment of the present invention. By optimizing the original control protection program, the speed of inter-electrode power transfer after the locking of the inverter station X is accelerated under the condition of no inter-station communication, the inverter station X is correctly matched with the stabilizing device, and the action of the stabilizing device is avoided.
The system provided by the embodiment of the invention is consistent with the DC power transmission basic theory, only needs to modify the control process in a small range, has operability and cannot influence the control of the DC system in a normal operation state. The system provided by the embodiment of the invention has no relation with the secondary parameters of the direct current system, and has universal applicability.
The invention has been described with reference to a few embodiments. However, other embodiments of the invention than the one disclosed above are equally possible within the scope of the invention, as would be apparent to a person skilled in the art from the appended patent claims.
Generally, all terms used in the claims are to be interpreted according to their ordinary meaning in the technical field, unless explicitly defined otherwise herein. All references to "a/an/the [ device, component, etc ]" are to be interpreted openly as referring to at least one instance of said device, component, etc., unless explicitly stated otherwise. The steps of any method disclosed herein do not have to be performed in the exact order disclosed, unless explicitly stated.
As will be appreciated by one skilled in the art, embodiments of the present application may be provided as a method, system, or computer program product. Accordingly, the present application may take the form of an entirely hardware embodiment, an entirely software embodiment or an embodiment combining software and hardware aspects. Furthermore, the present application may take the form of a computer program product embodied on one or more computer-usable storage media (including, but not limited to, disk storage, CD-ROM, optical storage, and the like) having computer-usable program code embodied therein.
The present application is described with reference to flowchart illustrations and/or block diagrams of methods, apparatus (systems), and computer program products according to embodiments of the application. It will be understood that each flow and/or block of the flow diagrams and/or block diagrams, and combinations of flows and/or blocks in the flow diagrams and/or block diagrams, can be implemented by computer program instructions. These computer program instructions may be provided to a processor of a general purpose computer, special purpose computer, embedded processor, or other programmable data processing apparatus to produce a machine, such that the instructions, which execute via the processor of the computer or other programmable data processing apparatus, create means for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.
These computer program instructions may also be stored in a computer-readable memory that can direct a computer or other programmable data processing apparatus to function in a particular manner, such that the instructions stored in the computer-readable memory produce an article of manufacture including instruction means which implement the function specified in the flowchart flow or flows and/or block diagram block or blocks.
These computer program instructions may also be loaded onto a computer or other programmable data processing apparatus to cause a series of operational steps to be performed on the computer or other programmable apparatus to produce a computer implemented process such that the instructions which execute on the computer or other programmable apparatus provide steps for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.
Finally, it should be noted that: the above embodiments are only for illustrating the technical solutions of the present invention and not for limiting the same, and although the present invention is described in detail with reference to the above embodiments, those of ordinary skill in the art should understand that: modifications and equivalents may be made to the embodiments of the invention without departing from the spirit and scope of the invention, which is to be covered by the claims.
Claims (13)
1. A method for interpolar power compensation control in a high-voltage direct current fed-in weak system, the method comprising:
acquiring a bipolar power control mode signal of an antipode, an operating state signal of the antipode and a bipolar power control mode signal of a local pole;
performing first logic relation judgment according to the bipolar power control mode signal of the antipole, the running state signal of the antipole and the bipolar power control mode signal of the local pole to obtain a first judgment signal of the local pole, performing switching judgment on a first numerical value and a second numerical value according to the first judgment signal of the local pole to obtain the first numerical value or the second numerical value as a final numerical value, and calculating according to the final numerical value and total power to obtain a power instruction value of the local pole;
switching and judging the undetermined speed of the local pole and the first lifting speed of the local pole according to the bipolar power control mode signal of the opposite pole to obtain a final lifting speed instruction value of the local pole; the undetermined speed of the local pole is the switching judgment result of the first lifting speed of the local pole and the second lifting speed of the local pole;
and performing interelectrode power compensation control on the local pole according to the power command value of the local pole and the final lifting speed command value of the local pole.
2. The method of claim 1, wherein the operating condition signal of the counter electrode is obtained by:
acquiring a normal communication signal of an opposite pole and a non-communication non-running state signal of the opposite pole;
performing NOT gate judgment on the communication normal signal of the opposite pole to obtain a reverse signal of the communication normal signal of the opposite pole;
and performing AND gate judgment according to the reverse signal of the communication normal signal of the antipode and the no-communication no-operation state signal of the antipode to obtain a second judgment signal of the local pole, and controlling the switching of the operation state signal of the antipode according to the second judgment signal of the local pole.
3. The method of claim 1, wherein performing a first logic relationship determination according to the bipolar power control mode signal of the opposite pole, the operating state signal of the opposite pole, and the bipolar power control mode signal of the local pole to obtain a first determination signal of the local pole, and performing a switching determination on the first value and the second value according to the first determination signal of the local pole to obtain the first value or the second value as a final value, comprises:
and performing AND gate judgment on the bipolar power control mode signal of the antipole, the running state signal of the antipole and the bipolar power control mode signal of the local pole to obtain a first judgment signal of the local pole, and controlling the switching between the first numerical value and the second numerical value according to the first judgment signal of the local pole.
4. The method of claim 1, wherein the undetermined rate of the local pole is obtained by:
acquiring a communication normal signal of an antipode, an operation state signal of the antipode and an original judgment logic signal;
performing NOT gate judgment on the operation state signal of the antipode to obtain a reverse signal of the operation state signal of the antipode;
carrying out OR gate judgment according to the reverse signal of the operation state signal of the antipode and the communication normal signal of the antipode to obtain a third judgment signal of the local pole;
and performing AND gate judgment according to the third judgment signal of the local pole and the original judgment logic signal to obtain a fourth judgment signal of the local pole, and performing switching judgment on the first lifting speed of the local pole and the second lifting speed of the local pole according to the fourth judgment signal of the local pole to obtain the undetermined speed of the local pole.
5. The method according to claim 4, wherein the determining, by switching the first lifting rate of the local pole and the second lifting rate of the local pole according to the fourth determination signal of the local pole, the pending rate of the local pole is obtained, and the determining includes:
if the value of the fourth determination signal of the local pole is a true value, switching to a second lifting speed of the local pole; otherwise, the first lifting speed of the local pole is maintained.
6. The method according to claim 1, wherein the determining, based on the bipolar power control mode signal for the opposite pole, whether the pending speed of the local pole and the first hoisting speed of the local pole are switched to obtain the final hoisting speed command value for the local pole comprises:
if the value of the bipolar power control mode signal of the antipole is a true value, switching to the undetermined rate of the antipole; otherwise, the first lifting speed of the local pole is maintained.
7. The method of claim 2, wherein the non-communicative non-operational status signal of the counter electrode is derived from the counter electrode by:
acquiring the voltage of a direct current line of an antipode, the voltage of a neutral line of the antipode, a communication normal signal of the antipode and a line fault phase-shifting signal of the antipode;
carrying out antipodal first fault judgment on the basis of the direct-current line voltage of the antipodal and the neutral line voltage of the antipodal to obtain an antipodal first judgment signal, carrying out antipodal second fault judgment on the basis of the antipodal communication normal signal to obtain an antipodal second judgment signal, and carrying out antipodal third fault judgment on the basis of the antipodal line fault phase shift signal to obtain an antipodal third judgment signal;
and carrying out logic relation judgment based on the first judgment signal of the antipode, the second judgment signal of the antipode and the third judgment signal of the antipode, and obtaining a no-communication no-operation state signal of the antipode according to a judgment result.
8. The method of claim 7, wherein said making a first opposite pole fault determination based on said opposite pole DC line voltage and said opposite pole neutral line voltage to obtain an opposite pole first determination signal comprises:
calculating the difference value of the voltage of the direct current line of the antipole and the voltage of the neutral line of the antipole to obtain a direct current voltage measured value of the antipole;
if the antipode is the positive electrode, judging whether the direct-current voltage measured value of the antipode is smaller than a first preset value: if yes, indicating that a first type fault of the antipode occurs by the first judging signal of the antipode; otherwise, the first judgment signal of the antipodal indicates that the first type fault of the antipodal does not occur;
if the antipode is a negative electrode, judging whether the direct-current voltage measured value of the antipode is greater than a second preset value: if yes, indicating that a first type fault of the antipode occurs by the first judging signal of the antipode; otherwise the first decision signal for the antipodal indicates that no fault of the first type of antipodal has occurred.
9. The method according to claim 7, wherein the determining a second fault of the antipode based on the communication normal signal of the antipode to obtain a second determination signal of the antipode comprises:
and performing NOT gate judgment on the communication normal signal of the antipode to obtain a second judgment signal of the antipode so as to indicate whether a second type fault of the antipode occurs.
10. The method of claim 7, wherein the third fault determining of the antipole based on the line fault phase shift signal of the antipole to obtain a third determination signal of the antipole comprises:
and performing NOT gate judgment on the line fault phase-shifting signal of the antipole to obtain a third judgment signal of the antipole so as to indicate whether a third type fault of the antipole occurs.
11. The method of claim 7, wherein performing a logical relationship determination based on the first determination signal of the opposite pole, the second determination signal of the opposite pole, and the third determination signal of the opposite pole, and obtaining a no-communication no-operation state signal of the opposite pole according to a determination result comprises:
if the first determination signal of the antipode, the second determination signal of the antipode and the third determination signal of the antipode indicate that a fault occurs, the non-communication non-operation state signal of the antipode indicates that the antipode is in a non-communication non-operation state; otherwise, the no-communication no-operation state signal of the opposite pole indicates that the opposite pole is not in the no-communication no-operation state.
12. The method of claim 7, wherein obtaining the no-communication no-operation status signal of the counter electrode comprises:
and controlling the switching of the bipolar power control mode signal of the opposite pole according to the non-communication non-operation state signal of the opposite pole.
13. A system for interpolar power compensation control of a high voltage direct current fed weak system, the system comprising:
a first pole for determining a no communication no operation state signal and a bipolar power control mode signal using the method of any one of claims 7-12 and transmitting the no communication no operation state signal, the bipolar power control mode signal, a communication normal signal, a line fault phase shift signal and an operation state signal to a second pole;
and a second pole for receiving the no-communication no-operation state signal, the bipolar power control mode signal, the communication normal signal, the line fault phase shift signal and the operation state signal transmitted by the first pole and performing the inter-pole power compensation control by using the method as claimed in any one of claims 1 to 6.
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| PCT/CN2021/141378 WO2022135596A1 (en) | 2020-12-25 | 2021-12-24 | Inter-polar power compensation control method for multi-infeed high voltage direct current weak system |
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| CN113451991B (en) * | 2021-06-08 | 2023-10-17 | 中国电力科学研究院有限公司 | DC line fault restarting control method and system for high-voltage DC power transmission system |
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