CN115102215B - Control method and device of HVDC system, storage medium and electronic equipment - Google Patents
Control method and device of HVDC system, storage medium and electronic equipment Download PDFInfo
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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
- H02J3/18—Arrangements for adjusting, eliminating or compensating reactive power in networks
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
- Y02E60/60—Arrangements for transfer of electric power between AC networks or generators via a high voltage DC link [HVCD]
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Abstract
The invention discloses a control method and device of an HVDC system, a storage medium and electronic equipment, and belongs to the field of extra-high voltage direct current transmission. The invention discloses an HVDC control strategy optimization method considering harmonic wave and voltage prediction, which comprehensively considers harmonic wave components of commutation voltage distortion and dynamic change of alternating voltage, can quantify the influence of multiple harmonic wave components of the commutation voltage and transient voltage change rate on commutation failure, and effectively solves the problem of insufficient trigger angle margin of a converter in a fault of a receiving-end alternating current system by outputting a trigger instruction to a commutation failure prediction link, thereby being capable of sensitively reducing the risks of first and subsequent commutation failures. The strategy provides theoretical guidance for planning operation and commutation failure risk suppression of the ultra-high voltage direct current transmission system.
Description
Technical Field
The invention relates to the field of ultra-high voltage direct current transmission, in particular to a control method and device of an HVDC system, a storage medium and electronic equipment.
Background
HVDC generally refers to high-voltage direct-current power transmission, and the high-voltage direct-current power transmission adopting a grid commutation converter is widely used for remote power transmission, underground and submarine cable power transmission and regional grid interconnection due to the advantages of long transmission distance, small power transmission loss, good economy and the like. The converter mostly adopts semi-controlled thyristors as the converter elements, and when the transmitting and receiving end alternating current system fails, the converter is extremely easy to cause commutation failure. The commutation failure will cause the direct current to increase suddenly and the direct voltage to dip, and the direct current blocking failure will be caused when serious, so that the direct current transmission power is interrupted, and finally the system operation is collapsed. If the fault clearing after the first commutation failure is not timely, the subsequent commutation failure is extremely easy to be caused.
The existing method for inhibiting commutation failure is mostly based on improving the topological structure of the converter or optimizing the control strategy of the system. The capacitor and the inductor are connected in series and parallel at two sides of the alternating current transformer, and the reactive compensation device is additionally arranged to change the structure of the converter, so that the inhibiting capability of commutation failure can be improved to a certain extent. However, the addition of the power electronic device has the defects of high investment cost, high operation risk and the like. Accordingly, a control method, a storage medium and an apparatus for an HVDC system for suppressing commutation failure are proposed.
Disclosure of Invention
Aiming at the defects of the prior art, the invention provides a control method, a device, a storage medium and electronic equipment of an HVDC system; when the method is applied to different alternating current fault scenes, the first and subsequent commutation failure risks in the HVDC system can be sensitively restrained by considering harmonic components of voltage distortion and dynamic changes of alternating current voltage.
The aim of the invention can be achieved by the following technical scheme:
a control method of an HVDC system, comprising the steps of:
Acquiring a leading trigger angle beta of a period on an inversion side alternating current system in the HVDC system; obtaining amplitude U nL and phase angle of each subharmonic component of phase-change voltage Three-phase voltage magnitudes U A、UB and U C;
Calculating the commutation voltage-time area of each subharmonic component according to U nL、φnL and the advanced trigger angle beta, and calculating the off angle gamma m according to the commutation voltage-time area; calculating zero crossing offset of commutation voltage according to three-phase voltage amplitude values U A、UB and U C
Comparing the off-angle value gamma m with the zero crossing offset of the commutation voltageThe difference between the critical Guan Duanjiao gamma min and the critical Guan Duanjiao gamma min, if notThe output enabling value is 0, and judging that the HVDC system has no risk of commutation failure fault;
If it meets Then the output enable is 1, calculating the hysteresis trigger angle margin delta alpha, and outputting the hysteresis trigger angle margin delta alpha to the HVDC system; wherein the method comprises the steps of
Wherein Δγ is a turn-off angle compensation margin, and K i is a voltage predicted value of the line voltage of the ac system on the inverter side.
Further, the determination of the voltage predicted value K i of the line voltage of the inverter-side ac system includes the steps of:
Acquiring a line voltage effective value U aci of an inversion side alternating current system and a voltage reference value U acief of an inversion side alternating current system line in the HVDC system;
comparing the line voltage effective value U aci with the line voltage reference value U acief; if U aci is greater than or equal to U acief, substituting B 1 to calculate K i, and if U aci is less than U acief, substituting B 2;
The calculation formula of the dynamic voltage predicted value K i is as follows: Wherein B 1、B2 is a correction coefficient.
Further, the commutation voltage-time area S n is:
Further, the determination of the off angle γ m includes the steps of:
calculating the calculated value gamma of each commutation voltage off angle:
Wherein L r is the inversion inductance of the inversion side converter, I d is direct current, and U L is the amplitude of the side line voltage of the converter valve;
And taking the minimum commutation voltage turn-off angle calculated value gamma as a turn-off angle gamma m.
Further, the zero crossing offset of the commutation voltage is calculated according to the three-phase voltage amplitude values U A、UB and U C The specific mode of (a) is as follows:
AB zero crossing offset The method comprises the following steps:
BC and CA zero crossing offset and AB zero crossing offset The calculation mode of (a) is the same, and the maximum value of the three zero point offset amounts is taken as
The invention also provides a control device of the HVDC system, which comprises the following modules:
The parameter acquisition module is used for acquiring a leading trigger angle beta of a period on an inversion side alternating current system in the HVDC system; obtaining amplitude U nL and phase angle of each subharmonic component of phase-change voltage Three-phase voltage magnitudes U A、UB and U C;
The data calculation module calculates the commutation voltage-time area of each subharmonic component according to U nL、φnL and the advanced trigger angle beta, and calculates the off angle gamma m according to the commutation voltage-time area; calculating zero crossing offset of commutation voltage according to three-phase voltage amplitude values U A、UB and U C
The judging module compares the off angle value gamma m with the zero crossing point offset of the commutation voltageThe difference between the critical Guan Duanjiao gamma min and the critical Guan Duanjiao gamma min, if notThe output enabling value is 0, and judging that the HVDC system has no risk of commutation failure fault; if it meetsThe output enabling is 1, and the risk of commutation failure faults of the HVDC system is judged;
The hysteresis trigger angle margin calculating module is used for calculating the hysteresis trigger angle margin and inputting the hysteresis trigger angle margin into the voltage predicting module;
the voltage prediction module calculates a voltage prediction value K i, adjusts the trigger angle margin and inputs the lag trigger angle margin into the commutation failure prediction module;
and the commutation failure prediction module inputs the hysteresis trigger angle margin into the HVDC system for adjustment.
Further, the hysteresis trigger angle margin Δα is calculated by:
wherein Δγ is a turn-off angle compensation margin, and K i is a voltage predicted value of the line voltage of the ac system on the inverter side.
Further, the determination of the voltage predicted value K i includes the steps of:
Acquiring a line voltage effective value U aci of an inversion side alternating current system and a voltage reference value U acief of an inversion side alternating current system line in the HVDC system;
comparing the line voltage effective value U aci with the line voltage reference value U acief; if U aci is greater than or equal to U acief, substituting B 1 to calculate K i, and if U aci is less than U acief, substituting B 2;
The calculation formula of the dynamic voltage predicted value K i is as follows:
Wherein B 1、B2 is a correction coefficient.
The present invention also provides a storage medium in which a computer-executable program is stored, which when executed by a processor is adapted to carry out a method of controlling an HVDC system as described in any of the preceding claims.
The present invention also provides an electronic device including:
at least one memory for storing a program;
At least one processor for loading the program to perform the method of controlling an HVDC system as claimed in any one of the preceding claims.
The invention has the beneficial effects that:
The invention quantitatively evaluates the commutation failure fault risk of the receiving-end alternating-current system by calculating the commutation-voltage time area and the dynamic voltage variation prediction based on harmonic components of the commutation voltage distortion and the dynamic variation of the alternating-current voltage, and provides a commutation failure fault suppression method. The suppression method comprises a predicted quantity K i based on voltage change, a turn-off angle value gamma m based on harmonic component and a zero crossing point offset of the commutation voltage Calculating a hysteresis trigger angle margin delta alpha, and improving a commutation failure prediction module; after the commutation failure fault occurs at the receiving end of the system, the triggering angle margin delta alpha is increased along with the increase of harmonic components and the fluctuation of alternating voltage, and the triggering angle margin delta alpha is output to the commutation failure prediction module to realize the advanced triggering of the converter; compared with the existing commutation failure suppression method, the strategy provided by the invention can sensitively suppress the first and subsequent commutation failure risks, and provides theoretical support for planning operation and commutation failure risk suppression of the extra-high voltage direct current transmission system.
Drawings
The invention is further described below with reference to the accompanying drawings.
FIG. 1 is a control flow diagram of the present application;
fig. 2 is an equivalent circuit diagram of a hvdc transmission receiving end system;
FIG. 3 is an inverter side turn-off angle response graph under a three-phase short circuit fault;
FIG. 4 is a graph of the valve side current response of the inverter side converter transformer under a three-phase short circuit fault;
FIG. 5 is an inverter-side advanced firing angle response plot for a three-phase short circuit fault;
FIG. 6 is an inverter-side turn-off angle response plot for a single-phase short circuit fault;
FIG. 7 is a graph of the valve side current response of the inverter side converter transformer under a single-phase short circuit fault;
Fig. 8 is an inverter-side advanced firing angle response graph for a single-phase short circuit fault.
Detailed Description
The following description of the embodiments of the present invention will be made clearly and completely with reference to the accompanying drawings, in which it is apparent that the embodiments described are only some embodiments of the present invention, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
In the description of the present specification, the descriptions of the terms "one embodiment," "example," "specific example," and the like, mean that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the present invention. In this specification, schematic representations of the above terms do not necessarily refer to the same embodiments or examples. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.
The embodiment of the invention discloses a control method of an HVDC system, which comprises the following steps:
Acquiring a leading trigger angle beta of a period on an inversion side alternating current system in the HVDC system; obtaining amplitude U nL and phase angle of each subharmonic component of phase-change voltage Three-phase voltage magnitudes U A、UB and U C;
Calculating the commutation voltage-time area of each subharmonic component according to U nL、φnL and the advanced trigger angle beta, and calculating the off angle gamma m according to the commutation voltage-time area; calculating zero crossing offset of commutation voltage according to three-phase voltage amplitude values U A、UB and U C
Comparing the off-angle value gamma m with the zero crossing offset of the commutation voltageThe difference between the critical Guan Duanjiao gamma min and the critical Guan Duanjiao gamma min, if notThe output enabling value is 0, and judging that the HVDC system has no risk of commutation failure fault;
If it meets Then the output enable is 1, calculating the hysteresis trigger angle margin delta alpha, and outputting the hysteresis trigger angle margin delta alpha to the HVDC system; wherein the method comprises the steps of
Wherein Δγ is a turn-off angle compensation margin, and K i is a voltage predicted value of the line voltage of the ac system on the inverter side.
Further, the determination of the voltage predicted value K i of the line voltage of the inverter-side ac system includes the steps of:
Acquiring a line voltage effective value U aci of an inversion side alternating current system and a voltage reference value U acief of an inversion side alternating current system line in the HVDC system;
comparing the line voltage effective value U aci with the line voltage reference value U acief; if U aci is greater than or equal to U acief, substituting B 1 to calculate K i, and if U aci is less than U acief, substituting B 2;
The calculation formula of the dynamic voltage predicted value K i is as follows:
Wherein B 1、B2 is a correction coefficient.
Further, the commutation voltage-time area S n is:
Further, the determination of the off angle γ m includes the steps of:
calculating the calculated value gamma of each commutation voltage off angle:
Wherein L r is the inversion inductance of the inversion side converter, I d is direct current, and U L is the amplitude of the side line voltage of the converter valve;
And taking the minimum commutation voltage turn-off angle calculated value gamma as a turn-off angle gamma m.
Further, the zero crossing offset of the commutation voltage is calculated according to the three-phase voltage amplitude values U A、UB and U C The specific mode of (a) is as follows:
AB zero crossing offset The method comprises the following steps:
BC and CA zero crossing offset and AB zero crossing offset The calculation mode of (a) is the same, and the maximum value of the three zero point offset amounts is taken as
Comparative example 1:
In this embodiment, as shown in fig. 2, a three-phase short-circuit fault is provided in the ac bus on the inverter side, and the fault occurs for 2s and the duration is 0.2s. The fault response conditions of the following three control strategies are compared and analyzed: control strategy i: CIGRE standard test system; control strategy II: the commutation failure prediction (CFPREV control; control strategy III. The method provided by the invention. Under three strategies, the system inversion side closing angle, the valve side current response of the converter transformer are shown in figures 3 and 4, and the lead triggering angle response is shown in figure 5.
As can be seen from fig. 3 and 4, after the three-phase short circuit fault at the inversion side of the ac system, the control strategies i and ii all have a phase-change failure, and the turn-off angle is reduced to 0. The reason why the CFPREV strategy is adopted to cause commutation failure at 2.21s is that CFPREV output causes the trigger angle alpha of the inversion side to be too small, the consumption reactive power of the converter is increased, the voltage of the alternating current system drops, and the commutation condition is deteriorated. The strategy of the invention suppresses the occurrence of the first commutation failure, and the system does not generate the subsequent commutation failure. When a fault occurs, the voltage change rate is smaller than 0, the voltage prediction variable K i outputs a value larger than 1, the trigger angle margin is increased, and the first commutation failure is restrained. As can be seen from comparison of fig. 5, the strategy of the present invention realizes early triggering, and the triggering margin is larger than that of the other two strategies, so that commutation failure fault can be suppressed to a certain extent.
Comparative example 2:
In this embodiment, a single-phase short-circuit fault is set in the ac busbar at the inverter side, and the fault occurs for 2s and the duration is 0.2s. The fault response conditions of the following three control strategies are compared and analyzed: control strategy i: CIGRE standard test system; control strategy II: CFPREV control; control strategy III: the method provided by the invention. The current response of the system inversion side closing angle and the valve side of the converter transformer under the three strategies is shown in figures 6 and 7; the response of the lead firing angle is shown in fig. 8.
As can be seen from the response chart, the single-phase short circuit fault causes the CIGRE original system to generate two continuous commutation failures, and CFPREV and the strategy of the invention inhibit the first and subsequent commutation failures. However, compared with CFPREV strategies, the strategy trigger angle margin is obtained in advance, and the advanced trigger angle margin is increased, so that the voltage recovery speed is higher. Meanwhile, when the fault is stable, the strategy cut-off angle value is not increased, the consumption of the converter is less, and the quick recovery of the direct current system is facilitated.
The embodiment of the invention also discloses a control device of the HVDC system, which comprises the following modules:
The parameter acquisition module is used for acquiring a leading trigger angle beta of a period on an inversion side alternating current system in the HVDC system; obtaining amplitude U nL and phase angle of each subharmonic component of phase-change voltage Three-phase voltage magnitudes U A、UB and U C;
The data calculation module calculates the commutation voltage-time area of each subharmonic component according to U nL、φnL and the advanced trigger angle beta, and calculates the off angle gamma m according to the commutation voltage-time area; calculating zero crossing offset of commutation voltage according to three-phase voltage amplitude values U A、UB and U C
The judging module compares the off angle value gamma m with the zero crossing point offset of the commutation voltageThe difference between the critical Guan Duanjiao gamma min and the critical Guan Duanjiao gamma min, if notThe output enabling value is 0, and judging that the HVDC system has no risk of commutation failure fault; if it meetsThe output enabling is 1, and the risk of commutation failure faults of the HVDC system is judged;
The hysteresis trigger angle margin calculating module is used for calculating the hysteresis trigger angle margin and inputting the hysteresis trigger angle margin into the voltage predicting module;
the voltage prediction module calculates a voltage prediction value K i, adjusts the trigger angle margin and inputs the lag trigger angle margin into the commutation failure prediction module;
and the commutation failure prediction module inputs the hysteresis trigger angle margin into the HVDC system for adjustment.
In addition, each functional module in the above embodiments may be integrated in one processing unit, or each unit may exist alone physically, or two or more units may be integrated in one unit. The integrated units can be realized in a form of hardware or a form of hardware and a form of software functional modules.
The embodiment of the invention also discloses an electronic device which is used for running a database storage process, wherein the control method of the HVDC system disclosed in the above figures 1 to 8 is executed when the database storage process is run.
The embodiment of the invention also discloses a computer storage medium, which comprises a database storage process, wherein equipment where the storage medium is controlled to execute the control method of the HVDC system disclosed in the figures 1 to 8 when the database storage process runs.
In the context of this disclosure, a computer storage medium may be a tangible medium that can contain, or store a program for use by or in connection with an instruction execution system, apparatus, or device. The machine-readable medium may be a machine-readable signal medium or a machine-readable storage medium. The machine-readable medium may include, but is not limited to, an electronic, magnetic, optical, electromagnetic, infrared, or semiconductor system, apparatus, or device, or any suitable combination of the foregoing. More specific examples of a machine-readable storage medium would include an electrical connection based on one or more wires, a portable computer diskette, a hard disk, a Random Access Memory (RAM), a read-only memory (ROM), an erasable programmable read-only memory (EPROM or flash memory), an optical fiber, a portable compact disc read-only memory (CD-ROM), an optical storage device, a magnetic storage device, or any suitable combination of the foregoing.
The foregoing has shown and described the basic principles, principal features and advantages of the invention. It will be understood by those skilled in the art that the present invention is not limited to the embodiments described above, and that the above embodiments and descriptions are merely illustrative of the principles of the present invention, and various changes and modifications may be made without departing from the spirit and scope of the invention, which is defined in the appended claims.
Claims (10)
1. A control method of an HVDC system, characterized by comprising the steps of:
Acquiring a leading trigger angle beta of a period on an inversion side alternating current system in the HVDC system; obtaining amplitude U nL and phase angle of each subharmonic component of phase-change voltage Three-phase voltage magnitudes U A、UB and U C;
Calculating the commutation voltage-time area of each subharmonic component according to U nL、φnL and the advanced trigger angle beta, and calculating the off angle gamma m according to the commutation voltage-time area; calculating zero crossing offset of commutation voltage according to three-phase voltage amplitude values U A、UB and U C
Comparing the off-angle value gamma m with the zero crossing offset of the commutation voltageThe difference between the critical Guan Duanjiao gamma min and the critical Guan Duanjiao gamma min, if notThe output enabling value is 0, and judging that the HVDC system has no risk of commutation failure fault;
If it meets Then the output enable is 1, calculating the hysteresis trigger angle margin delta alpha, and outputting the hysteresis trigger angle margin delta alpha to the HVDC system; wherein the method comprises the steps of
Wherein Δγ is a turn-off angle compensation margin, and K i is a voltage predicted value of the line voltage of the ac system on the inverter side.
2. A control method of an HVDC system according to claim 1, characterized in that the determination of the voltage forecast value K i of the line voltage of the ac system on the inverter side comprises the steps of:
Acquiring a line voltage effective value U aci of an inversion side alternating current system and a voltage reference value U acief of an inversion side alternating current system line in the HVDC system;
comparing the line voltage effective value U aci with the line voltage reference value U acief; if U aci is greater than or equal to U acief, substituting B 1 to calculate K i, and if U aci is less than U acief, substituting B 2;
The calculation formula of the dynamic voltage predicted value K i is as follows:
Wherein B 1、B2 is a correction coefficient.
3. A control method of an HVDC system according to claim 1, characterized in that the commutation voltage-time area S n is:
4. A control method of an HVDC system according to claim 3, characterized in that the determination of the shut-off angle γ m comprises the steps of:
calculating the calculated value gamma of each commutation voltage off angle:
Wherein L r is the inversion inductance of the inversion side converter, I d is direct current, and U L is the amplitude of the side line voltage of the converter valve;
And taking the minimum commutation voltage turn-off angle calculated value gamma as a turn-off angle gamma m.
5. The control method of an HVDC system according to claim 1, wherein the commutation voltage zero crossing offset is calculated from the three phase voltage amplitudes U A、UB and U C The specific mode of (a) is as follows:
AB zero crossing offset The method comprises the following steps:
BC and CA zero crossing offset and AB zero crossing offset The calculation mode of (a) is the same, and the maximum value of the three zero point offset amounts is taken as
6. A control device of an HVDC system, characterized by comprising the following modules:
The parameter acquisition module is used for acquiring a leading trigger angle beta of a period on an inversion side alternating current system in the HVDC system; obtaining amplitude U nL and phase angle of each subharmonic component of phase-change voltage Three-phase voltage magnitudes U A、UB and U C;
The data calculation module calculates the commutation voltage-time area of each subharmonic component according to U nL、φnL and the advanced trigger angle beta, and calculates the off angle gamma m according to the commutation voltage-time area; calculating zero crossing offset of commutation voltage according to three-phase voltage amplitude values U A、UB and U C
The judging module compares the off angle value gamma m with the zero crossing point offset of the commutation voltageThe difference between the critical Guan Duanjiao gamma min and the critical Guan Duanjiao gamma min, if notThe output enabling value is 0, and judging that the HVDC system has no risk of commutation failure fault; if it meetsThe output enabling is 1, and the risk of commutation failure faults of the HVDC system is judged;
The hysteresis trigger angle margin calculating module is used for calculating the hysteresis trigger angle margin and inputting the hysteresis trigger angle margin into the voltage predicting module;
the voltage prediction module calculates a voltage prediction value K i, adjusts the trigger angle margin and inputs the lag trigger angle margin into the commutation failure prediction module;
and the commutation failure prediction module inputs the hysteresis trigger angle margin into the HVDC system for adjustment.
7. The control device of an HVDC system according to claim 6, wherein the hysteresis firing angle margin Δα is calculated by:
wherein Δγ is a turn-off angle compensation margin, and K i is a voltage predicted value of the line voltage of the ac system on the inverter side.
8. The control device of an HVDC system according to claim 7, wherein the determination of the voltage forecast K i comprises the steps of:
Acquiring a line voltage effective value U aci of an inversion side alternating current system and a voltage reference value U acief of an inversion side alternating current system line in the HVDC system;
comparing the line voltage effective value U aci with the line voltage reference value U acief; if U aci is greater than or equal to U acief, substituting B 1 to calculate K i, and if U aci is less than U acief, substituting B 2;
The calculation formula of the dynamic voltage predicted value K i is as follows:
Wherein B 1、B2 is a correction coefficient.
9. A storage medium, characterized in that a computer executable program is stored therein, which computer executable program, when being executed by a processor, is adapted to carry out the control method of an HVDC system according to any of claims 1-5.
10. An electronic device, comprising:
at least one memory for storing a program;
At least one processor for loading the program to perform the method of controlling an HVDC system in accordance with any one of claims 1-5.
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| CN109510230A (en) * | 2018-12-11 | 2019-03-22 | 国网山东省电力公司电力科学研究院 | A kind of continuous commutation failure suppressing method for HVDC transmission system |
| CN113783401A (en) * | 2021-10-15 | 2021-12-10 | 国网四川省电力公司电力科学研究院 | Trigger angle control method, system, device and medium for high-voltage direct-current transmission system |
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| CN114374214B (en) * | 2020-10-15 | 2023-05-05 | 许继电气股份有限公司 | Transient voltage control method and device for extra-high voltage hybrid direct current transmission system |
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| CN109510230A (en) * | 2018-12-11 | 2019-03-22 | 国网山东省电力公司电力科学研究院 | A kind of continuous commutation failure suppressing method for HVDC transmission system |
| CN113783401A (en) * | 2021-10-15 | 2021-12-10 | 国网四川省电力公司电力科学研究院 | Trigger angle control method, system, device and medium for high-voltage direct-current transmission system |
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