CN113437893A - DC control method and device based on additional control strategy of inverter arc-quenching angle - Google Patents
DC control method and device based on additional control strategy of inverter arc-quenching angle Download PDFInfo
- Publication number
- CN113437893A CN113437893A CN202111002437.5A CN202111002437A CN113437893A CN 113437893 A CN113437893 A CN 113437893A CN 202111002437 A CN202111002437 A CN 202111002437A CN 113437893 A CN113437893 A CN 113437893A
- Authority
- CN
- China
- Prior art keywords
- angle
- control
- arc
- quenching
- current
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
- 238000010791 quenching Methods 0.000 title claims abstract description 133
- 238000000034 method Methods 0.000 title claims abstract description 41
- 238000011217 control strategy Methods 0.000 title claims abstract description 27
- 230000008033 biological extinction Effects 0.000 claims abstract description 47
- 230000010363 phase shift Effects 0.000 claims abstract description 23
- 238000010304 firing Methods 0.000 claims description 26
- 230000015654 memory Effects 0.000 claims description 13
- 230000009467 reduction Effects 0.000 claims description 6
- 238000004364 calculation method Methods 0.000 claims description 5
- 238000004590 computer program Methods 0.000 claims description 3
- 238000010586 diagram Methods 0.000 description 10
- 230000001052 transient effect Effects 0.000 description 10
- 230000004044 response Effects 0.000 description 7
- 230000008859 change Effects 0.000 description 4
- 230000007423 decrease Effects 0.000 description 4
- 230000006870 function Effects 0.000 description 3
- 238000005457 optimization Methods 0.000 description 3
- 230000008569 process Effects 0.000 description 3
- 230000005540 biological transmission Effects 0.000 description 2
- 230000003247 decreasing effect Effects 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 230000002441 reversible effect Effects 0.000 description 2
- 230000009471 action Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000000903 blocking effect Effects 0.000 description 1
- 238000004891 communication Methods 0.000 description 1
- 230000001808 coupling effect Effects 0.000 description 1
- 230000002452 interceptive effect Effects 0.000 description 1
- 238000010295 mobile communication Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000003287 optical effect Effects 0.000 description 1
- 230000010355 oscillation Effects 0.000 description 1
- 238000004088 simulation Methods 0.000 description 1
- 239000007787 solid Substances 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
Images
Classifications
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M7/00—Conversion of ac power input into dc power output; Conversion of dc power input into ac power output
- H02M7/42—Conversion of dc power input into ac power output without possibility of reversal
- H02M7/44—Conversion of dc power input into ac power output without possibility of reversal by static converters
- H02M7/48—Conversion of dc power input into ac power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode
- H02M7/505—Conversion of dc power input into ac power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a thyratron or thyristor type requiring extinguishing means
- H02M7/515—Conversion of dc power input into ac power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a thyratron or thyristor type requiring extinguishing means using semiconductor devices only
- H02M7/521—Conversion of dc power input into ac power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a thyratron or thyristor type requiring extinguishing means using semiconductor devices only in a bridge configuration
-
- 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
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M1/00—Details of apparatus for conversion
- H02M1/06—Circuits specially adapted for rendering non-conductive gas discharge tubes or equivalent semiconductor devices, e.g. thyratrons, thyristors
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M1/00—Details of apparatus for conversion
- H02M1/32—Means for protecting converters other than automatic disconnection
-
- 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]
Landscapes
- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Inverter Devices (AREA)
Abstract
The invention discloses a direct current control method and a direct current control device based on an additional control strategy of an inverter arc-quenching angle, wherein the method comprises the following steps: if a certain phase voltage value is lower than a preset voltage value, reducing alternating current voltage, increasing direct current, calculating a maximum phase shift value between phase voltages, and calculating an overlap angle increase value based on voltage variation and current variation; if the control mode of the inverter is switched from constant extinction angle control to constant current control, judging whether the trigger angle under the constant extinction angle control is larger than the trigger angle under the constant current control; if the trigger angle under the control of the fixed arc-quenching angle is not larger than the trigger angle under the control of the fixed current, correcting the initial reference arc-quenching angle under the control of the fixed current to correct the arc-quenching angle; and calculating a final arc-quenching angle based on the corrected arc-quenching angle and the initial reference arc-quenching angle under the control of the fixed arc-quenching angle. And calculating the final arc-quenching angle under the control of the constant current by correcting the arc-quenching angle and the initial reference arc-quenching angle under the control of the constant arc-quenching angle so as to keep the stability of the direct current.
Description
Technical Field
The invention belongs to the technical field of alternating current and direct current hybrid power grids, and particularly relates to a direct current control method and device based on an additional control strategy for an arc extinguishing angle of an inverter.
Background
The AC/DC hybrid large power grid is a typical nonlinear system, and the transient response process of the hybrid power grid is very complicated due to the AC/DC interactive coupling effect under the impact of large disturbance. The dc control function therefore usually requires a corresponding optimization depending on the characteristics of the connected network.
Commutation failure is one of the most common faults of inverters. When the two bridge arms are switched to be connected, if the blocking capability of the valve which is just disconnected is not recovered within the time of the action of the reverse voltage or the phase change process cannot be finished all the time during the reverse voltage, the valve which is switched to be connected is switched to be the valve which is scheduled to be disconnected when the valve voltage is converted to be the positive direction, and the phase change failure is called.
When the existing commutation failure control method is applied to a high-voltage direct-current power transmission system, the double commutation failure which cannot realize continuous commutation in the same period can be effectively relieved. However, the existing methods cannot mitigate the continuous commutation failure at the time of transient. When the direct current is lower than the reference inverter current, the rectifier and the inverter are both operated under current control for a short time, and the continuous commutation failure is caused by the tiny change of the alternating voltage, so that the main reasons of the commutation failure are that the alternating voltage is reduced, the direct current is increased, and the phase voltage is over-point shifted.
When the high-voltage direct current normally operates, the operating point is determined by constant current control of the rectifier and constant arc-extinguishing angle control of the inverter. In the case of a transient condition, such as a reduction in transient dc current, the rectifier operates at a minimum firing angle value to maintain a constant current, while the inverter operates at constant current control. If the dc current is controlled by the rectifier and the constant current of the inverter before the operating point is reached, the system is very susceptible to small variations in the ac voltage. In other words, in the event of an ac fault, the dc current is likely to increase or decrease due to commutation voltage oscillations. Therefore, such a change in the direct current increases the frequency of commutation failure. In the transient state, decreasing the ac voltage and increasing the dc current will cause commutation failure. At the instant when the ac voltage of the inverter decreases, the dc current increases. The phase shift and overlap angle increase and the arc-extinguishing angle decreases. These features may be attributed to control mode ambiguity shortly after fault clearance. Therefore, a method is needed to mitigate commutation failures and reduce dc system instability due to ac faults or control mode ambiguity.
Disclosure of Invention
The invention provides a direct current control method and a direct current control device based on an additional control strategy of an inverter arc-quenching angle, which are used for solving at least one technical problem.
In a first aspect, the present invention provides a dc control method based on an inverter extinction angle additional control strategy, including: responding to the acquired three-phase voltage, and judging whether each phase voltage is lower than a preset voltage value based on a comparator; if a certain phase voltage value is lower than a preset voltage value, the alternating voltage is reduced,Increasing the direct current, calculating a maximum phase shift value between the phase voltages, and calculating an overlap angle increase value based on the voltage variation and the current variation; judging whether the control mode of the inverter is switched from constant extinction angle control to constant current control or not based on the comparator; if the control mode of the inverter is switched from constant extinction angle control to constant current control, judging whether the trigger angle under the constant extinction angle control is larger than the trigger angle under the constant current control; if the trigger angle under the control of the fixed arc-quenching angle is larger than the trigger angle under the control of the fixed current, the reference arc-quenching angle is increased, so that the trigger angle under the control of the fixed arc-quenching angle of the inverter can track the trigger angle under the control of the fixed current; if the trigger angle under the control of the fixed arc-quenching angle is not larger than the trigger angle under the control of the fixed current, correcting the initial reference arc-quenching angle under the control of the fixed current to obtain a corrected arc-quenching angle, wherein the expression for calculating the corrected arc-quenching angle is as follows:
in the formula (I), wherein,
in order to correct the arc-extinguishing angle,
is the maximum phase shift value between the phase voltages,
in order to increase the value of the overlap angle,
is an initial reference arc-quenching angle under the control of constant current; and calculating a final arc-quenching angle based on the corrected arc-quenching angle and an initial reference arc-quenching angle under the control of the fixed arc-quenching angle, and using the final arc-quenching angle to track the trigger angle under the control of the fixed current.
In a second aspect, the present invention provides a dc control device based on an inverter extinction angle additional control strategy, including: a first judgment module configured to judge whether each phase voltage is lower than a preset voltage based on a comparator in response to the acquired three-phase voltagesA pressure value; the first calculation module is configured to reduce alternating current voltage, increase direct current, calculate a maximum phase shift value between phase voltages and calculate an overlap angle increase value based on voltage variation and current variation if a certain phase voltage value is lower than a preset voltage value; the second judging module is configured to judge whether the control mode of the inverter is switched from constant extinction angle control to constant current control or not based on the comparator; the third judgment module is configured to judge whether the trigger angle under the control of the fixed extinction angle is larger than the trigger angle under the control of the fixed current if the control mode of the inverter is switched from the control of the fixed extinction angle to the control of the fixed current; the adjusting module is configured to increase the reference arc-quenching angle if the trigger angle under the control of the fixed arc-quenching angle is larger than the trigger angle under the control of the fixed current, so that the trigger angle under the control of the fixed arc-quenching angle of the inverter can track the trigger angle under the control of the fixed current; a correcting module configured to correct an initial reference arc-quenching angle under constant current control if the firing angle under constant arc-quenching angle control is not greater than the firing angle under constant current control, so as to obtain a corrected arc-quenching angle, wherein an expression for calculating the corrected arc-quenching angle is as follows:
in the formula (I), wherein,
in order to correct the arc-extinguishing angle,
is the maximum phase shift value between the phase voltages,
in order to increase the value of the overlap angle,
is an initial reference arc-quenching angle under the control of constant current; and the second calculation module is configured to calculate a final arc-quenching angle based on the corrected arc-quenching angle and an initial reference arc-quenching angle under the control of the fixed arc-quenching angle, and the final arc-quenching angle is used for tracking the trigger angle under the control of the fixed current.
In a third aspect, an electronic device is provided, comprising: the control system comprises at least one processor and a memory which is in communication connection with the at least one processor, wherein the memory stores instructions which can be executed by the at least one processor, and the instructions are executed by the at least one processor, so that the at least one processor can execute the steps of the direct current control method based on the inverter arc-quenching angle additional control strategy according to any embodiment of the invention.
In a fourth aspect, the present invention further provides a computer-readable storage medium, on which a computer program is stored, the computer program comprising program instructions, which, when executed by a computer, cause the computer to perform the steps of a dc control method based on an inverter arc-quenching angle additional control strategy according to any one of the embodiments of the present invention.
According to the direct-current control method and device based on the additional control strategy for the arc-quenching angle of the inverter, when the main control of the inverter is current control, the direct current is increased, the phase shift and the overlap angle are increased and the arc-quenching angle is reduced at the moment when the alternating voltage of the inverter is reduced. Therefore, in the transient state, the reduction of the alternating voltage and the increase of the direct current can lead to the reduction of the arc-quenching angle, thereby causing the commutation failure, and because the output of the fixed arc-quenching angle control tracks the output of the fixed current control, the final arc-quenching angle under the fixed current control is calculated by correcting the arc-quenching angle and the initial reference arc-quenching angle under the fixed arc-quenching angle control, thereby ensuring that the commutation system has enough time for arc-quenching and commutation, reducing the risk of the commutation failure, and keeping the stability of the direct current.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings needed to be used in the description of the embodiments are briefly introduced below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings based on the drawings without creative efforts.
Fig. 1 is a flowchart of a dc control method based on an additional control strategy for an inverter arc-quenching angle according to an embodiment of the present invention;
fig. 2 is a schematic diagram of a three-phase inverter according to an embodiment of the present invention;
FIG. 3 is a schematic diagram illustrating the transient response of an AC voltage under a fault disturbance according to an embodiment of the present invention;
FIG. 4 is a schematic diagram illustrating the transient response of the firing angle under a fault disturbance according to an embodiment of the present invention;
FIG. 5 is a schematic diagram of reactive transient response under a fault disturbance according to an embodiment of the present invention;
FIG. 6 is a schematic diagram illustrating transient response of an arc-quenching angle under a fault disturbance according to an embodiment of the present invention;
fig. 7 is a block diagram of a dc control device based on an additional control strategy for an inverter arc-quenching angle according to an embodiment of the present invention;
fig. 8 is a schematic structural diagram of an electronic device according to an embodiment of the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are some, but not all, embodiments of the present invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Referring to fig. 1, a flowchart of a dc control method based on an inverter arc-extinguishing angle additional control strategy according to the present application is shown.
As shown in fig. 1, in step S101, in response to the acquired three-phase voltage values, it is determined whether each phase voltage is lower than a preset voltage value based on a comparator;
in step S102, if a voltage value of a certain phase is lower than a preset voltage value, decreasing the ac voltage, increasing the dc current, calculating a maximum phase shift value between the phase voltages, and calculating an overlap angle increase value based on a voltage variation and a current variation;
in step S103, it is determined whether the inverter control method is switched from the constant extinction angle control to the constant current control based on the comparator;
in step S104, if the control mode of the inverter is switched from the constant extinction angle control to the constant current control, it is determined whether the firing angle under the constant extinction angle control is larger than the firing angle under the constant current control;
in step S105, if the firing angle under the control of the fixed extinction angle is greater than the firing angle under the control of the fixed current, the reference extinction angle is increased so that the firing angle under the control of the fixed extinction angle of the inverter can track the firing angle under the control of the fixed current;
in step S106, if the flip angle under the constant arc-out angle control is not greater than the flip angle under the constant current control, the initial reference arc-out angle under the constant current control is modified to obtain a modified arc-out angle, where an expression for calculating the modified arc-out angle is:
in the formula (I), wherein,
in order to correct the arc-extinguishing angle,
is the maximum phase shift value between the phase voltages,
in order to increase the value of the overlap angle,
is an initial reference arc-quenching angle under the control of constant current;
in step S107, a final extinction angle is calculated based on the corrected extinction angle and an initial reference extinction angle under constant-current control, and used to track the firing angle under constant-current control.
According to the method, the final arc-quenching angle under the control of the constant current is calculated by correcting the arc-quenching angle and the initial reference arc-quenching angle under the control of the constant arc-quenching angle, so that the commutation system can have enough arc-quenching angle under the control mode of the additional arc-quenching angle when the direct current is increased, the sufficient time for arc-quenching and commutation of the commutation system is ensured, and the risk of commutation failure is reduced.
Referring to fig. 2, a schematic diagram of a three-phase inverter of the present application is shown.
As shown in fig. 2, the three-phase line-to-ground voltage may be represented by the following equation:
in the formula,
、
and
respectively an A phase voltage, a B phase voltage and a C phase voltage,
is the angular velocity, t is the time,
is the instantaneous line to ground voltage.
The phase shift may be calculated from the relationship of the intersection points of the alternating voltage, which may be defined as:
in the formula,
the difference between the maximum value and the minimum value of the three-phase voltage is obtained.
When the a-phase voltage decreases, the phase shift is increased, and can be expressed by the following equation:
the reduction of the arc-quenching angle can be calculated from the relation of the commutation voltages in case of a single phase line to ground fault. When the current commutates, the commutation voltage is:
wherein,
、
。
the voltage drop caused by the commutating reactance is expressed as:
in the formula,
in order to be the firing angle of the firing pin,
in order to exchange the voltage drop caused by the reactance,
= 
+
，
at an overlapping angle
The overlap angle can be calculated from equation (6)
When the direct current increases due to any disturbance, the overlap angle and the voltage drop caused by the commutation reactance also increase. Thus, the arc-extinguishing angle is reduced and commutation failures are more frequent. The voltage drop caused by the commutating reactance can be further expressed as:
in the formula,
for the voltage reduction value caused by the commutation reactance,
in order to be the angular velocity of the object,
is an inductance of an alternating current power supply,
is the current of the direct current line.
In summary, in order to reduce the control mode ambiguity of the HVDC system, an additional control method is employed, i.e. a PI controller is employed when the main control of the inverter is current control. In this method, the output of the arc-extinguishing angle control tracks the output of the current control. Thus, the output of the additional controller is used as a reference for the arc-quenching angle to maintain dc current stability.
In a specific embodiment, the process for verifying the dc control optimization effect of the inverter arc-quenching angle additional control strategy by using the method of the present application is as follows:
the voltage stability of a certain extra-high voltage direct current receiving end power grid is lost after the fault, and simulation results are shown in fig. 3, 4, 5 and 6. It can be seen that after the direct current control optimization measure of the inverter extinction angle additional control strategy is adopted, the corresponding trigger angle
Increasing the reactive power absorbed by the inverter station from the AC network
The voltage of a receiving end power grid can be maintained stable, and the direct current can be recovered to be stably transmitted. In addition, as can be seen from the comparison curve of the extinction angles of the inverters shown in fig. 6, after the fault is cleared, the extinction angles of the inverters are always maintained at a large value for operation, and although no phase commutation failure occurs, the receiving-end power grid loses voltage stability due to large reactive power demand of the inverter station. By adopting the method to optimize the prediction parameters, the arc extinguishing angle of the inverter is rapidly reduced after the fault occurs, and although two short-time commutation failures occur, the receiving-end system can recover the voltage stability. Therefore, for a direct current feed-in receiving end power grid with the voltage stability problem, the method can greatly relieve the risk of the commutation failure of the converter of the high-voltage direct current transmission system and ensure the stable operation of the system.
Referring to fig. 7, a block diagram of a dc control device based on an inverter arc-extinguishing angle additional control strategy according to the present application is shown.
As shown in fig. 7, the dc control apparatus 200 includes a first determining module 210, a first calculating module 220, a second determining module 230, a third determining module 240, an adjusting module 250, a correcting module 260, and a second calculating module 270.
The first judging module 210 is configured to respond to the acquired three-phase voltage, and judge whether each phase voltage is lower than a preset voltage value based on a comparator;
a first calculation module 220 configured to reduce the ac voltage, increase the dc current, calculate a maximum phase shift value between the phase voltages, and calculate an overlap angle increase value based on a voltage variation and a current variation if a certain phase voltage value is lower than a preset voltage value;
a second determination module 230 configured to determine whether the control manner of the inverter is switched from the constant extinction angle control to the constant current control based on the comparator;
a third determining module 240, configured to determine whether the firing angle under the control of the fixed extinction angle is greater than the firing angle under the control of the fixed current if the control mode of the inverter is switched from the control of the fixed extinction angle to the control of the fixed current;
the adjusting module 250 is configured to increase the reference arc-quenching angle if the firing angle under the control of the fixed arc-quenching angle is larger than the firing angle under the control of the fixed current, so that the firing angle under the control of the fixed arc-quenching angle of the inverter can track the firing angle under the control of the fixed current;
a correcting module 260 configured to correct the initial reference arc-quenching angle under the constant current control to a corrected arc-quenching angle if the firing angle under the constant arc-quenching angle control is not greater than the firing angle under the constant current control, wherein an expression for calculating the corrected arc-quenching angle is as follows:
，
in the formula,
in order to correct the arc-extinguishing angle,
is the maximum phase shift value between the phase voltages,
in order to increase the value of the overlap angle,
is an initial reference arc-quenching angle under the control of constant current;
and a second calculating module 270 configured to calculate a final extinction angle based on the corrected extinction angle and an initial reference extinction angle under the constant-current control, for use in tracking the firing angle under the constant-current control.
It should be understood that the modules recited in fig. 7 correspond to various steps in the method described with reference to fig. 1. Thus, the operations and features described above for the method and the corresponding technical effects are also applicable to the modules in fig. 7, and are not described again here.
In other embodiments, the present invention further provides a computer-readable storage medium, where the computer-readable storage medium stores computer-executable instructions, where the computer-executable instructions may execute the dc control method based on the inverter arc-quenching angle additional control strategy in any of the above method embodiments;
as one embodiment, the computer-readable storage medium of the present invention stores computer-executable instructions configured to:
responding to the acquired three-phase voltage value, and judging whether each phase voltage is lower than a preset voltage value based on a comparator;
if a certain phase voltage value is lower than a preset voltage value, reducing alternating current voltage, increasing direct current, calculating a maximum phase shift value between phase voltages, and calculating an overlap angle increase value based on voltage variation and current variation;
judging whether the control mode of the inverter is switched from constant extinction angle control to constant current control or not based on the comparator;
if the control mode of the inverter is switched from constant extinction angle control to constant current control, judging whether the trigger angle under the constant extinction angle control is larger than the trigger angle under the constant current control;
if the trigger angle under the control of the fixed arc-quenching angle is larger than the trigger angle under the control of the fixed current, the reference arc-quenching angle is increased, so that the trigger angle under the control of the fixed arc-quenching angle of the inverter can track the trigger angle under the control of the fixed current;
if the trigger angle under the control of the fixed extinction angle is not larger than the trigger angle under the control of the fixed current, the initial reference under the control of the fixed current is carried outCorrecting the arc-quenching angle to obtain a corrected arc-quenching angle, wherein the expression for calculating the corrected arc-quenching angle is as follows:
，
in the formula,
in order to correct the arc-extinguishing angle,
is the maximum phase shift value between the phase voltages,
in order to increase the value of the overlap angle,
is an initial reference arc-quenching angle under the control of constant current;
and calculating a final arc-quenching angle based on the corrected arc-quenching angle and an initial reference arc-quenching angle under the control of the fixed arc-quenching angle, and using the final arc-quenching angle to track the trigger angle under the control of the fixed current.
The computer-readable storage medium may include a storage program area and a storage data area, wherein the storage program area may store an operating system, an application program required for at least one function; the storage data area may store data created from use of the dc control device based on the inverter extinction angle additional control strategy, and the like. Further, the computer-readable storage medium may include high speed random access memory, and may also include memory, such as at least one magnetic disk storage device, flash memory device, or other non-volatile solid state storage device. In some embodiments, the computer readable storage medium optionally includes memory remotely located from the processor, and these remote memories may be connected over a network to a dc control device based on the inverter arc-quenching angle additional control strategy. Examples of such networks include, but are not limited to, the internet, intranets, local area networks, mobile communication networks, and combinations thereof.
Fig. 8 is a schematic structural diagram of an electronic device according to an embodiment of the present invention, and as shown in fig. 8, the electronic device includes: a processor 310 and a memory 320. The electronic device may further include: an input device 330 and an output device 340. The processor 310, the memory 320, the input device 330, and the output device 340 may be connected by a bus or other means, as exemplified by the bus connection in fig. 8. The memory 320 is the computer-readable storage medium described above. The processor 310 executes various functional applications and data processing of the server by running nonvolatile software programs, instructions and modules stored in the memory 320, namely, implementing the dc control method based on the inverter extinction angle additional control strategy of the above method embodiments. The input device 330 may receive input numeric or character information and generate key signal inputs related to user settings and function control of the dc control device based on the inverter arc-extinguishing angle additional control strategy. The output device 340 may include a display device such as a display screen.
The electronic device can execute the method provided by the embodiment of the invention, and has the corresponding functional modules and beneficial effects of the execution method. For technical details that are not described in detail in this embodiment, reference may be made to the method provided by the embodiment of the present invention.
As an embodiment, the electronic device is applied to a dc control device based on an inverter extinction angle additional control strategy, and is used for a client, and includes: at least one processor; and a memory communicatively coupled to the at least one processor; wherein the memory stores instructions executable by the at least one processor to cause the at least one processor to:
responding to the acquired three-phase voltage value, and judging whether each phase voltage is lower than a preset voltage value based on a comparator;
if a certain phase voltage value is lower than a preset voltage value, reducing alternating current voltage, increasing direct current, calculating a maximum phase shift value between phase voltages, and calculating an overlap angle increase value based on voltage variation and current variation;
judging whether the control mode of the inverter is switched from constant extinction angle control to constant current control or not based on the comparator;
if the control mode of the inverter is switched from constant extinction angle control to constant current control, judging whether the trigger angle under the constant extinction angle control is larger than the trigger angle under the constant current control;
if the trigger angle under the control of the fixed arc-quenching angle is larger than the trigger angle under the control of the fixed current, the reference arc-quenching angle is increased, so that the trigger angle under the control of the fixed arc-quenching angle of the inverter can track the trigger angle under the control of the fixed current;
if the trigger angle under the control of the fixed arc-quenching angle is not larger than the trigger angle under the control of the fixed current, correcting the initial reference arc-quenching angle under the control of the fixed current to obtain a corrected arc-quenching angle, wherein the expression for calculating the corrected arc-quenching angle is as follows:
，
in the formula,
in order to correct the arc-extinguishing angle,
is the maximum phase shift value between the phase voltages,
in order to increase the value of the overlap angle,
is an initial reference arc-quenching angle under the control of constant current;
and calculating a final arc-quenching angle based on the corrected arc-quenching angle and an initial reference arc-quenching angle under the control of the fixed arc-quenching angle, and using the final arc-quenching angle to track the trigger angle under the control of the fixed current.
Through the above description of the embodiments, those skilled in the art will clearly understand that each embodiment can be implemented by software plus a necessary general hardware platform, and certainly can also be implemented by hardware. With this understanding in mind, the above-described technical solutions may be embodied in the form of a software product, which can be stored in a computer-readable storage medium, such as ROM/RAM, magnetic disk, optical disk, etc., and includes instructions for causing a computer device (which may be a personal computer, a server, or a network device, etc.) to execute the methods of the various embodiments or some parts of the embodiments.
Finally, it should be noted that: the above examples are only intended to illustrate the technical solution of the present invention, but not to limit it; although the present invention has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; and such modifications or substitutions do not depart from the spirit and scope of the corresponding technical solutions of the embodiments of the present invention.
Claims (7)
1. A direct current control method based on an additional control strategy of an inverter arc-quenching angle is characterized by comprising the following steps:
responding to the acquired three-phase voltage value, and judging whether each phase voltage is lower than a preset voltage value based on a comparator;
if a certain phase voltage value is lower than a preset voltage value, reducing alternating current voltage, increasing direct current, calculating a maximum phase shift value between phase voltages, and calculating an overlap angle increase value based on voltage variation and current variation;
judging whether the control mode of the inverter is switched from constant extinction angle control to constant current control or not based on the comparator;
if the control mode of the inverter is switched from constant extinction angle control to constant current control, judging whether the trigger angle under the constant extinction angle control is larger than the trigger angle under the constant current control;
if the trigger angle under the control of the fixed arc-quenching angle is larger than the trigger angle under the control of the fixed current, the reference arc-quenching angle is increased, so that the trigger angle under the control of the fixed arc-quenching angle of the inverter can track the trigger angle under the control of the fixed current;
if the trigger angle under the control of the fixed extinction angle is notAnd if the current is larger than the trigger angle under the constant current control, correcting the initial reference arc-quenching angle under the constant current control to obtain a corrected arc-quenching angle, wherein the expression for calculating the corrected arc-quenching angle is as follows:
，
in the formula,
in order to correct the arc-extinguishing angle,
is the maximum phase shift value between the phase voltages,
in order to increase the value of the overlap angle,
is an initial reference arc-quenching angle under the control of constant current;
and calculating a final arc-quenching angle based on the corrected arc-quenching angle and an initial reference arc-quenching angle under the control of the fixed arc-quenching angle, and using the final arc-quenching angle to track the trigger angle under the control of the fixed current.
2. The direct-current control method based on the additional control strategy for the arc-quenching angle of the inverter according to claim 1, wherein the expression for calculating the maximum phase shift value between the phase voltages is as follows:
，
in the formula,
is the maximum phase shift value between the phase voltages,
the difference between the maximum value and the minimum value of the three-phase voltage is obtained.
3. The direct-current control method based on the additional control strategy for the inverter arc-quenching angle according to claim 1, wherein the expression for calculating the overlap angle increase value is as follows:
in the formula,
in order to be the firing angle of the firing pin,
to instantaneously set the voltage to the ground,
，
，
is the difference between the maximum value and the minimum value of the three-phase voltage,
，
in the formula,
for the voltage reduction value caused by the commutation reactance,
in order to be the angular velocity of the object,
is an inductance of an alternating current power supply,
is the current of the direct current line.
4. The direct-current control method based on the inverter arc-quenching angle additional control strategy according to claim 1, wherein the expression for calculating the final arc-quenching angle is as follows:
in the formula,
in order to achieve the final angle of arc-quenching,
for an initial reference extinction angle under constant extinction angle control,
to correct the arc-extinguishing angle.
5. A direct current control device based on an additional control strategy of an inverter arc-quenching angle is characterized by comprising the following components:
the first judgment module is configured to respond to the acquired three-phase voltage and judge whether each phase voltage is lower than a preset voltage value or not based on the comparator;
the first calculation module is configured to reduce alternating current voltage, increase direct current, calculate a maximum phase shift value between phase voltages and calculate an overlap angle increase value based on voltage variation and current variation if a certain phase voltage value is lower than a preset voltage value;
the second judging module is configured to judge whether the control mode of the inverter is switched from constant extinction angle control to constant current control or not based on the comparator;
the third judgment module is configured to judge whether the trigger angle under the control of the fixed extinction angle is larger than the trigger angle under the control of the fixed current if the control mode of the inverter is switched from the control of the fixed extinction angle to the control of the fixed current;
the adjusting module is configured to increase the reference arc-quenching angle if the trigger angle under the control of the fixed arc-quenching angle is larger than the trigger angle under the control of the fixed current, so that the trigger angle under the control of the fixed arc-quenching angle of the inverter can track the trigger angle under the control of the fixed current;
a correcting module configured to correct an initial reference arc-quenching angle under constant current control if the firing angle under constant arc-quenching angle control is not greater than the firing angle under constant current control, so as to obtain a corrected arc-quenching angle, wherein an expression for calculating the corrected arc-quenching angle is as follows:
，
in the formula,
in order to correct the arc-extinguishing angle,
is the maximum phase shift value between the phase voltages,
in order to increase the value of the overlap angle,
is an initial reference arc-quenching angle under the control of constant current;
and the second calculation module is configured to calculate a final arc-quenching angle based on the corrected arc-quenching angle and an initial reference arc-quenching angle under the control of the fixed arc-quenching angle, and the final arc-quenching angle is used for tracking the trigger angle under the control of the fixed current.
6. An electronic device, comprising: at least one processor, and a memory communicatively coupled to the at least one processor, wherein the memory stores instructions executable by the at least one processor to enable the at least one processor to perform the method of any of claims 1 to 4.
7. A computer-readable storage medium, on which a computer program is stored, which, when being executed by a processor, carries out the method of any one of claims 1 to 4.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111002437.5A CN113437893B (en) | 2021-08-30 | 2021-08-30 | DC control method and device based on additional control strategy of inverter arc-quenching angle |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111002437.5A CN113437893B (en) | 2021-08-30 | 2021-08-30 | DC control method and device based on additional control strategy of inverter arc-quenching angle |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN113437893A true CN113437893A (en) | 2021-09-24 |
| CN113437893B CN113437893B (en) | 2021-12-31 |
Family
ID=77798311
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202111002437.5A Active CN113437893B (en) | 2021-08-30 | 2021-08-30 | DC control method and device based on additional control strategy of inverter arc-quenching angle |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN113437893B (en) |
Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4775924A (en) * | 1987-02-27 | 1988-10-04 | Asea Power Systems, Inc. | Inverter commutation failure prevention method and apparatus |
| JPH1141935A (en) * | 1997-07-11 | 1999-02-12 | Mitsubishi Heavy Ind Ltd | Thyristor commutation failure prevention equipment |
| CN105977956A (en) * | 2016-06-20 | 2016-09-28 | 南方电网科学研究院有限责任公司 | Coordination control method and system for transient recovery of direct current transmission system |
| CN106787896A (en) * | 2017-03-02 | 2017-05-31 | 南方电网科学研究院有限责任公司 | Circuit for avoiding abnormal arc extinguishing angle measurement and circuit for avoiding direct current transmission commutation failure |
| CN110474358A (en) * | 2019-08-28 | 2019-11-19 | 华北电力大学（保定） | Inhibit the control method of continuous commutation failure under extra-high voltage direct-current layer-specific access mode |
| CN112564157A (en) * | 2020-12-15 | 2021-03-26 | 深圳供电局有限公司 | Fixed extinction angle control improvement method for inhibiting continuous commutation failure |
| KR20210048262A (en) * | 2019-10-23 | 2021-05-03 | 한국전력공사 | Apparatus and method for controlling extinction angle of lcc hvdc system |
-
2021
- 2021-08-30 CN CN202111002437.5A patent/CN113437893B/en active Active
Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4775924A (en) * | 1987-02-27 | 1988-10-04 | Asea Power Systems, Inc. | Inverter commutation failure prevention method and apparatus |
| JPH1141935A (en) * | 1997-07-11 | 1999-02-12 | Mitsubishi Heavy Ind Ltd | Thyristor commutation failure prevention equipment |
| CN105977956A (en) * | 2016-06-20 | 2016-09-28 | 南方电网科学研究院有限责任公司 | Coordination control method and system for transient recovery of direct current transmission system |
| CN106787896A (en) * | 2017-03-02 | 2017-05-31 | 南方电网科学研究院有限责任公司 | Circuit for avoiding abnormal arc extinguishing angle measurement and circuit for avoiding direct current transmission commutation failure |
| CN110474358A (en) * | 2019-08-28 | 2019-11-19 | 华北电力大学（保定） | Inhibit the control method of continuous commutation failure under extra-high voltage direct-current layer-specific access mode |
| KR20210048262A (en) * | 2019-10-23 | 2021-05-03 | 한국전력공사 | Apparatus and method for controlling extinction angle of lcc hvdc system |
| CN112564157A (en) * | 2020-12-15 | 2021-03-26 | 深圳供电局有限公司 | Fixed extinction angle control improvement method for inhibiting continuous commutation failure |
Non-Patent Citations (3)
| Title |
|---|
| CHENGXIANG YANG等: "Improved Firing Angle Control for Mitigating Continuous Commutation Failure of HVDC System", 《2020 IEEE SUSTAINABLE POWER AND ENERGY CONFERENCE (ISPEC)》 * |
| 熊华强等: "含分层接入特高压直流的交直流混联电网机电-电磁暂态混合仿真研究", 《电力系统保护与控制》 * |
| 袁阳等: "直流输电系统换相失败研究综述", 《电力自动化设备》 * |
Also Published As
| Publication number | Publication date |
|---|---|
| CN113437893B (en) | 2021-12-31 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN110233490A (en) | Avoid the direct current transportation fault recovery control method and system of continuous commutation failure | |
| US20200333384A1 (en) | Method for calculating a transient overvoltage at a direct current sending end by taking into account a dynamic process of a control system | |
| KR20120030556A (en) | Controlling an inverter device of a high voltage dc system for supporting an ac system | |
| Ouyang et al. | Current-limit control method to prevent subsequent commutation failure of LCC-HVDC based on adaptive trigger voltage | |
| CN115579944A (en) | Network-building type energy storage control system and method with self-current-limiting protection capability | |
| CN110323774B (en) | Direct-current line fault restarting method, VSC control method and device | |
| CN113437893B (en) | DC control method and device based on additional control strategy of inverter arc-quenching angle | |
| Liu et al. | Multiple commutation failure suppression method of LCC-HVDC transmission system based on fault timing sequence characteristics | |
| Lin et al. | Adaptive fault ride through control of VSM Grid-forming converters | |
| CN115276072A (en) | Method, device, terminal and medium for inhibiting subsequent commutation failure of direct current system | |
| CN104734172B (en) | A kind of self-tuning PI control method improving HVDC system suppression commutation failure ability | |
| CN108616137A (en) | It is a kind of to realize that ac and dc systems coordinate the direct current control restored and protect parameter optimization method | |
| Liu et al. | An enhanced commutation failure prevention control in LCC based HVDC systems | |
| CN109004671B (en) | Modal switching method, modal switching device and back-to-back equipment | |
| CN109659950B (en) | Reactive power control system and method of voltage source converter with variable lower limit voltage | |
| He et al. | Cross-Forming Control and Fault Current Limiting for Grid-Forming Inverters | |
| CN112350363B (en) | Flexible direct current control method and related device | |
| Xu et al. | Quantitative criteria of considering AC infeed in DC fault assessment of modular multilevel converters | |
| KR101639861B1 (en) | Energy Management System | |
| CN110707739B (en) | High-voltage direct-current transmission trigger pulse control method and device | |
| CN113433426B (en) | Method and device for calculating critical fault position of converter bus of direct-current transmission system | |
| CN107026483B (en) | A kind of compound phase shifting control strategy under the DC transmission system inverter side AC fault suitable for LCC | |
| CN103337853A (en) | Direct current power adjustment and control method for inhibiting alternating current-direct current coupling weakening stability | |
| CN115902401B (en) | Phase detection method of power unit, related equipment and medium | |
| CN110380441B (en) | Stability control criterion method and device for identifying locking and restarting states of extra-high voltage direct current |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant |