CN112103928A - Arc suppression inverter control method, control device, and computer-readable storage medium - Google Patents
Arc suppression inverter control method, control device, and computer-readable storage medium Download PDFInfo
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- CN112103928A CN112103928A CN202010989523.9A CN202010989523A CN112103928A CN 112103928 A CN112103928 A CN 112103928A CN 202010989523 A CN202010989523 A CN 202010989523A CN 112103928 A CN112103928 A CN 112103928A
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H7/00—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions
- H02H7/26—Sectionalised protection of cable or line systems, e.g. for disconnecting a section on which a short-circuit, earth fault, or arc discharge has occured
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H9/00—Emergency protective circuit arrangements for limiting excess current or voltage without disconnection
- H02H9/08—Limitation or suppression of earth fault currents, e.g. Petersen coil
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- 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
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- 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
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Abstract
The embodiment of the invention provides an arc suppression inverter control method, control equipment and a computer readable storage medium, wherein the method comprises the following steps: when a single-phase earth fault of a three-phase power grid is confirmed, a target amplitude and a target phase instruction of output voltage of an arc suppression inverter are obtained; adjusting an output voltage of an arc suppression inverter to a target amplitude and a target phase, wherein the adjusting the output voltage of the arc suppression inverter to the target phase comprises: calculating a phase switching angle according to the current phase sequence of the three-phase power grid and the target phase when the phase switching is required to be performed according to the phase sequence of the three-phase voltage of the three-phase power grid and the target phase instruction; and adjusting the phase of the output voltage once at the zero-crossing point of each period of the output voltage of the arc extinction inverter according to a preset step length, wherein the phase switching angle is adjusted in one period. According to the embodiment of the invention, the tracking source signal is automatically switched in the arc extinction process, so that the phase sequence switching time is greatly reduced, and the response speed is improved.
Description
Technical Field
The embodiment of the invention relates to the field of ground fault arc extinction, in particular to a control method and control equipment of an arc extinction inverter and a computer readable storage medium.
Background
The safe, stable and reliable operation of the power distribution network is the basis for guaranteeing national economic development, and has an important position in social life, and the problem of power supply reliability mostly originates from single-phase earth faults. The scale of the power distribution network is enlarged, so that the earth fault current is increased, the fault arc cannot be naturally extinguished, the accident is often enlarged due to the overvoltage generated by the intermittent arc, and the operation reliability of the power system is obviously reduced.
When a three-phase input single-phase output type inverter is used for arc extinction of a ground fault point by combining with an arc extinction coil, a tracking target needs to be switched among different phase sequences, and a common control method is to switch a tracking source, namely, the phase of the target tracking source to be switched is firstly calculated, and then phase-locked tracking control is carried out on output voltage according to the current phase of the tracking source. The method only has one time of calculating the phase difference value of the tracking voltage and the given voltage in each power frequency period, so that the method has the defects of long adjusting time and low response speed when switching between different phase sequences.
However, for a three-phase input single-phase output type inverter, the switching time for switching the tracking target between different phase sequences is short, and if the tracking target is not controlled, voltage sudden change is caused, so that large impact current and harmonic wave are caused, and great harm is caused to elements such as a transformer and an arc suppression coil.
Disclosure of Invention
The embodiment of the invention provides an arc extinction inverter control method, control equipment and a computer readable storage medium, and aims to solve the problems of long regulation time and slow response speed when output voltage is switched among different phase sequences in the arc extinction process of a three-phase input single-phase output type inverter.
In order to solve the above technical problems, an embodiment of the present invention provides an arc suppression inverter control method for arc suppression of a single-phase ground fault point of a power grid through an arc suppression inverter and an arc suppression coil, where the arc suppression inverter is a three-phase input single-phase output type inverter, and the method includes:
when a single-phase earth fault of a three-phase power grid is confirmed, a target amplitude instruction and a target phase instruction of output voltage of the arc suppression inverter are obtained, and when the arc suppression inverter outputs a target amplitude corresponding to the target amplitude instruction and a target phase voltage corresponding to the target phase instruction, the arc suppression coil outputs compensation current for suppressing an earth arc of an earth fault point;
adjusting the output voltage of the arc suppression inverter to a target amplitude and a target phase, wherein the adjusting the output voltage of the arc suppression inverter to the target phase comprises:
judging whether phase switching is needed or not according to the phase sequence of the three-phase voltage of the three-phase power grid and a target phase instruction;
when the phase switching is required, calculating a phase switching angle according to the current phase sequence of the three-phase power grid and a target phase corresponding to the target phase instruction;
and adjusting the phase of the output voltage once according to a preset step length when the phase of the output voltage of the arc extinction inverter crosses zero in each period, so that the phase of the output voltage of the arc extinction inverter is adjusted in place after one period.
Preferably, the determining whether to perform phase switching according to the phase sequence of the three-phase voltage of the three-phase power grid and the target phase instruction includes:
acquiring a current voltage vector angle of the three-phase power grid, acquiring a voltage phase sequence of a current sampling time point according to the current voltage vector angle, recording a current tracking phase in real time and receiving a phase instruction to be tracked;
when the current tracking phase and the phase to be tracked are different, it is confirmed that phase switching is required.
Preferably, the adjusting the phase of the output voltage once according to a preset step at a zero crossing point of each period in the phase of the output voltage of the arc extinction inverter includes: adjusting the phase of the output voltage of the arc extinction inverter by a preset angle at each zero-crossing point of the output voltage.
Preferably, calculating a phase switching angle according to the current phase sequence of the three-phase power grid and a target phase corresponding to the target phase command, includes:
when the voltage phase sequence of the last sampling time point is reversely switched to the voltage phase sequence of the current sampling time point, calculating a phase switching angle by using a reverse switching mark, wherein the reverse switching is that the voltage phase sequence is switched according to the sequence of A-C, C-B, B-A, the reverse switching mark Dir is-1, the phase switching angle alpha is Dir multiplied by beta, and the beta is a three-phase angle difference of 120 degrees;
when the voltage phase sequence at the last sampling time point is forward-switched to the voltage phase sequence at the current sampling time point, a forward switching flag is used to calculate a phase switching angle, wherein the forward switching is switched to the voltage phase sequence in the order of a-B, B-C, C-a, the forward switching flag Dir is equal to 1, and the phase switching angle is α -Dir × β.
Preferably, adjusting the output voltage of the arc suppression inverter to a target amplitude includes: and adjusting the given voltage of the arc extinction inverter to be a target amplitude, and performing voltage-current closed-loop control according to the given voltage so as to adjust the amplitude of the output voltage of the arc extinction inverter to be the target amplitude.
Preferably, the method comprises:
sampling the voltage of a neutral point of the three-phase power grid, and comparing the voltage of the neutral point with a preset threshold voltage;
and when the voltage of the neutral point is greater than the preset threshold voltage, confirming that the three-phase power grid has a single-phase earth fault.
Preferably, the acquiring a target amplitude command and a target phase command of the output voltage of the arc extinction inverter includes:
detecting a distributed capacitance value of the three-phase power grid;
according to the distributed capacitance value, calculating an inductance current value of the arc suppression coil for extinguishing the grounding arc of the grounding fault point;
and obtaining a target amplitude instruction and a target phase instruction of the output voltage according to the inductance current value or in a real-time communication mode.
Preferably, the phase sequence of the three-phase voltage of the three-phase power grid is obtained by:
carrying out Clark conversion on the three-phase voltage of the three-phase power grid to obtain a power grid voltage vector angle;
and obtaining the phase sequence of the three-phase voltage according to the phase relation between the power grid vector angle and the three-phase voltage.
Embodiments of the present invention also provide an arc suppression inverter control apparatus, including a memory and a processor, where the memory stores therein a computer program executable by the processor, and the processor implements the steps of the arc suppression inverter control method described above when executing the computer program.
An embodiment of the present invention further provides a computer-readable storage medium, where a computer program is stored on the storage medium, and when the computer program is executed by a processor, the steps of the arc suppression inverter control method described above are implemented.
The arc suppression inverter control method, the control equipment and the computer readable storage medium have the following beneficial effects: the phase switching angle is rapidly calculated according to the phase sequence of the three-phase voltage in the three-phase power grid and the target phase instruction for tracking, tracking source signals do not need to be switched, phase sequence switching time is greatly shortened, and response speed is improved. According to the embodiment of the invention, when the arc extinction inverter tracks the phase sequence to switch between any two phases of the three-phase voltage, the angle adjusting range does not exceed 120 degrees every time according to the relation between the phase voltages, the angle change range is ensured to be minimum, and the phase adjusting time is shortened. And in order to avoid the existence of larger impact current and harmonic wave in the phase sequence tracking switching process, the arc suppression inverter selects the zero-crossing position of the output voltage to adjust the tracking phase, and the arc suppression inverter has the characteristics of low distortion rate of the output voltage and small impact current.
Drawings
Fig. 1 is a schematic flow chart of an arc suppression inverter control method provided by an embodiment of the invention;
fig. 2 is a schematic flow chart of obtaining a phase switching angle in an arc suppression inverter control method according to an embodiment of the present invention;
fig. 3 is a schematic flow chart of phase switching obtained in the arc suppression inverter control method provided by the embodiment of the invention;
fig. 4 is a schematic flow chart of obtaining phase switching timing in the arc suppression inverter control method provided by the embodiment of the invention;
fig. 5 is a schematic diagram of an arc suppression inverter provided by 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 more clearly apparent, the embodiments of the present invention are described in further detail below with reference to the accompanying drawings and the embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the embodiments of the invention and are not limiting of the embodiments of the invention.
The invention provides an arc suppression inverter control method, which is used for changing the inductance current of an arc suppression coil (the arc suppression coil is used as the output load of the arc suppression inverter) by adjusting the amplitude and tracking phase sequence of output voltage according to a received command signal by a three-phase input single-phase output type inverter when a single-phase earth fault occurs in a three-phase power grid, compensating the earth capacitance current of the three-phase power grid, limiting the magnitude of the earth fault current, and enabling the earth fault current to be smaller than a specified value, thereby extinguishing the earth arc caused by the earth fault point current.
As shown in fig. 1, the method is a flow chart of a method for controlling an arc suppression inverter according to an embodiment of the present invention, which is used for arc suppression of a single-phase ground fault point of a power grid through an arc suppression inverter and an arc suppression coil, wherein the arc suppression inverter is a three-phase input single-phase output type inverter, and an output end of the arc suppression inverter is connected with the arc suppression coil. Specifically, the method of the present embodiment may be integrated into the arc suppression inverter (in this case, the arc suppression inverter is connected to the three-phase grid), or the method may be executed by a control device connected to the arc suppression inverter (the control device is connected to the three-phase grid), and the method includes:
step S11: when the single-phase earth fault of the three-phase power grid is confirmed, a target amplitude instruction and a target phase instruction of the output voltage of the arc-suppression inverter are rapidly acquired. When the arc suppression inverter outputs the target amplitude corresponding to the target amplitude instruction and the voltage of the target phase corresponding to the target phase instruction, the arc suppression coil outputs compensation current, compensates the capacitance current to ground of the power grid, limits the magnitude of the current leaked from the ground fault point, and enables the current leaked from the ground fault point to be smaller than a safety value, so that the ground arc caused by the current leaked from the ground fault point is extinguished.
Specifically, whether a single-phase ground fault occurs in the three-phase power grid can be confirmed by the following method: sampling the voltage of a neutral point of a three-phase power grid, and comparing the voltage of the neutral point with a preset threshold voltage; and when the voltage of the neutral point is greater than the preset threshold voltage, confirming that the three-phase power grid has the single-phase earth fault. The above-mentioned manner of sampling the voltage of the neutral point and the specific value of the predetermined threshold voltage are well known in the art, and are not described herein again.
In the step, a target amplitude instruction and a target phase instruction of the output voltage of the arc-suppression inverter can be obtained in the following modes: when the fact that the displacement voltage of the neutral point accords with the condition of the single-phase earth fault is detected, the measurement of the distributed capacitance value of the three-phase power grid is started immediately, then according to the distributed capacitance value obtained through measurement, the inductance current value required by the arc suppression coil for complete compensation after the single-phase earth fault occurs is calculated, namely the inductance current value of the arc suppression coil for extinguishing the earth arc of the earth fault point, and finally according to the inductance current value or a target amplitude instruction and a target phase instruction of the output voltage of the arc suppression inverter are obtained from arc suppression detection equipment through a communication implementation mode, so that the amplitude and the phase of the current in the arc suppression coil can be adjusted to be used for extinguishing the earth arc of the earth fault point by controlling the output voltage of the arc suppression inverter to.
Step S12: the target amplitude command and the target phase command obtained in step S11 may be sent to the arc suppression inverter in a command manner, so that the arc suppression inverter may adjust its output voltage to the target amplitude and the target phase, that is, the arc suppression inverter outputs the target amplitude and the target phase voltage to the arc suppression coil, so that the inductance current of the arc suppression coil changes, the ground capacitance current of the power grid is compensated, and the ground arc caused by the leakage current of the ground fault point is extinguished.
In the above step S12, the output voltage of the arc-extinguishing inverter may be adjusted to the target amplitude by: and adjusting the given voltage of the arc suppression inverter to be a target amplitude, and performing voltage-current closed-loop control according to the given voltage so as to adjust the amplitude of the output voltage of the arc suppression inverter to be the target amplitude. Adjusting the voltage amplitude in a closed loop manner is well known in the art and will not be described herein.
As shown in fig. 2, the output voltage of the arc suppression inverter can be adjusted to the target phase by:
step S121: and acquiring the phase sequence of the three-phase voltage of the three-phase power grid. This step is performed at a fixed cycle, which may be performed, for example, at the command of the controller.
Specifically, the phase sequence of the three-phase voltage of the three-phase power grid can be obtained by: the three-phase voltage of a three-phase power grid is sampled, Clark (CLACK) conversion is carried out on the three-phase voltage to obtain a power grid voltage vector angle, and then the phase relation between the power grid voltage vector angle and the three-phase voltage, namely the phase sequence of the three-phase voltage, is obtained according to a coordinate conversion relation. Referring to fig. 4, taking a positive sequence a/B/C three-phase voltage as an example, if the grid vector angle is consistent with the phase angle of the a-phase voltage, the phase sequence of the three-phase voltage is determined to be a positive sequence, otherwise, the phase sequence of the three-phase voltage is determined to be a reverse sequence.
The method for obtaining the voltage phase sequence of the three-phase power grid belongs to the conventional art in the field, and it can be understood that a person skilled in the art can use other methods to calculate the voltage phase sequence, and the description thereof is omitted.
Step S122: and judging whether phase switching is needed, executing the step S123 when the phase switching is needed, otherwise returning to the step S121, and continuously sampling the phase sequence of the three-phase voltage of the next period.
Step S123: and when the phase switching is required, calculating a phase switching angle according to the current phase sequence of the three-phase power grid and a target phase corresponding to the target phase instruction.
In this step, the phase switching angle may be calculated by:
as shown in fig. 4, when the voltage phase sequence at the previous sampling time point is reversely switched to the voltage phase sequence at the current sampling time point, the reverse switching flag is used to calculate the phase switching angle, wherein the reverse switching is switched to the voltage phase sequence according to the sequence a-C, C-B, B-a, at this time, the reverse switching flag Dir is-1, and the corresponding phase switching angle α is Dir × β, where β is the three-phase angle difference of 120 degrees;
when the voltage phase sequence at the last sampling time point is switched to the voltage phase sequence at the current sampling time point in the forward direction, the forward direction switching flag is used for calculating the phase switching angle, wherein the forward direction switching is switched to the voltage phase sequence according to the sequence of A-B, B-C, C-A, the forward direction switching flag Dir is 1, and correspondingly, the phase switching angle is alpha-Dir multiplied by beta.
In order to ensure that the switching between different phase sequences meets the requirements of fast response and short switching time, the maximum conversion angle of the phase sequence switching is 120 degrees, for example, the phase sequence at the last sampling time point is the phase voltage of A, the phase sequence at the current sampling time point is the phase voltage of C, and since the switching sequence is A-C, Dir is-1, namely, alpha is Dir × 120 degrees is-120 degrees. The phase sequence of the last sampling time point is an A phase voltage, the phase sequence of the current time sampling point is a B phase voltage, and since the switching sequence is A-B, Dir is 1, and the target tracking phase of the inverter is alpha, Dir multiplied by 120 degrees, which is 120 degrees.
Step S124: and adjusting the phase of the output voltage of the arc extinction inverter once according to a preset step length at the zero crossing point of each period of the output voltage of the arc extinction inverter, so that the phase of the output voltage of the arc extinction inverter is adjusted in place after one period, namely, adjusting the phase switching angle obtained by calculation in the step S123 every period.
When the phase sequence is switched, the principle that the impulse current is as small as possible when switching between different phase sequences can be followed, specifically, a target tracking phase angle α (i.e., the phase switching angle in step S123) can be calculated according to a phase sequence switching command, the phase is adjusted at the zero-crossing point position of the output voltage according to the target tracking phase angle, the phase adjustment angle of each time is recorded until the accumulated value of the phase adjustment angle is equal to the target phase angle α, the phase sequence switching is completed, and the change angle of the interrupt position of each time can be adjusted according to the actual requirement. Taking the example analysis of the phase sequence switching from A to C, firstly, the target tracking phase of the inverter can be calculated to be-120 degrees, namely the inverter needs to be adjusted to-120 degrees when being switched to the target phase on the basis of the current phase, the phase adjustment angle of each zero crossing point of the output voltage is selected to be 60 degrees, when the output voltage is detected to be at the position of the zero crossing point, the phase adjustment angle is adjusted to be 120 degrees every time on the basis of the original phase, the final phase sequence adjustment angle is accumulated to be 120 degrees after 2 zero crossing points, the phase sequence tracking switching is completed, and the switching can be completed within 20ms at most if the input is a cycle.
Referring to fig. 3, it can be specifically determined whether to perform phase switching according to the following manner:
step S125: and acquiring a current voltage vector angle of the three-phase power grid, acquiring a voltage phase sequence of a current sampling time point according to the current voltage vector angle, recording a current tracking phase in real time, and receiving a phase instruction to be tracked.
Step S126: it is judged whether the current tracking phase and the phase to be tracked (corresponding to the phase instruction to be tracked) are the same, and when the current tracking phase and the phase to be tracked are different, step S127 is performed, otherwise, the process returns to step S125.
In this step, the voltage at the current sampling time point needs to be phase-sequenced, so that it is used for phase-sequence comparison at the next sampling time point.
Step S127: confirming that phase switching is required.
An embodiment of the present invention further provides an arc suppression inverter control device 5, as shown in fig. 5, where the arc suppression inverter control device 5 may specifically be a power supply device or the like, and the arc suppression inverter control device 5 includes a memory 51 and a processor 52, where the memory 51 stores a computer program executable by the processor 52, and the processor 52 implements the steps of the arc suppression inverter control method described above when executing the computer program. The arc suppression inverter control device 5 in this embodiment belongs to the same concept as the arc suppression inverter control method in the embodiment corresponding to fig. 1 to 4, and specific implementation processes thereof are detailed in the corresponding method embodiments, and technical features in the method embodiments are correspondingly applicable in this device embodiment, which is not described herein again.
Embodiments of the present invention further provide a computer-readable storage medium, where a computer program is stored, and when the computer program is executed by a processor, the steps of the arc suppression inverter control method are implemented.
The computer-readable storage medium in this embodiment is the same as the arc suppression inverter control method in the embodiment corresponding to fig. 1 to 4, and specific implementation processes thereof are detailed in the corresponding method embodiments, and technical features in the method embodiments are correspondingly applicable in the apparatus embodiments, and are not described herein again.
It should be understood that, the sequence numbers of the steps in the foregoing embodiments do not imply an execution sequence, and the execution sequence of each process should be determined by its function and inherent logic, and should not constitute any limitation to the implementation process of the embodiments of the present application.
It is obvious to those skilled in the art that, for convenience and simplicity of description, the foregoing functional units and modules are merely illustrated in terms of division, and in practical applications, the foregoing functions may be distributed as needed by different functional units and modules. Each functional unit and module in the embodiments may be integrated in one processor, or each unit may exist alone physically, or two or more units are integrated in one unit, and the integrated unit may be implemented in a form of hardware, or in a form of software functional unit. In addition, specific names of the functional units and modules are only for convenience of distinguishing from each other, and are not used for limiting the protection scope of the present application. The specific working processes of the units and modules in the system may refer to the corresponding processes in the foregoing method embodiments, and are not described herein again.
In the above embodiments, the descriptions of the respective embodiments have respective emphasis, and reference may be made to the related descriptions of other embodiments for parts that are not described or illustrated in a certain embodiment.
Those of ordinary skill in the art will appreciate that the various illustrative elements and algorithm steps described in connection with the embodiments disclosed herein may be implemented as electronic hardware or combinations of computer software and electronic hardware. Whether such functionality is implemented as hardware or software depends upon the particular application and design constraints imposed on the implementation. Skilled artisans may implement the described functionality in varying ways for each particular application, but such implementation decisions should not be interpreted as causing a departure from the scope of the present application.
In the embodiments provided in the present application, it should be understood that the disclosed crowbar inverter control method and apparatus can be implemented in other ways. For example, the crowbar inverter control device embodiments described above are merely illustrative.
In addition, functional units in the embodiments of the present application may be integrated into one processor, or each unit may exist alone physically, or two or more units are integrated into one unit. The integrated unit can be realized in a form of hardware, and can also be realized in a form of a software functional unit.
The integrated modules/units, if implemented in the form of software functional units and sold or used as separate products, may be stored in a computer readable storage medium. Based on such understanding, all or part of the flow in the method of the embodiments described above can be realized by a computer program, which can be stored in a computer-readable storage medium and can realize the steps of the embodiments of the methods described above when the computer program is executed by a processor. Wherein the computer program comprises computer program code, which may be in the form of source code, object code, an executable file or some intermediate form, etc. The computer-readable medium may include: any physical or interface switching device, recording medium, usb disk, removable hard disk, magnetic disk, optical disk, computer Memory, Read-Only Memory (ROM), Random Access Memory (RAM), electrical carrier wave signal, telecommunication signal, software distribution medium, etc., capable of carrying said computer program code. It should be noted that the computer readable medium may contain other components which may be suitably increased or decreased as required by legislation and patent practice in jurisdictions, for example, in some jurisdictions, computer readable media which may not include electrical carrier signals and telecommunications signals in accordance with legislation and patent practice.
The above-mentioned embodiments are only used for illustrating the technical solutions of the present application, and not for limiting the same; although the present application has been described in detail with reference to the foregoing embodiments, it should 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; such modifications and substitutions do not substantially depart from the spirit and scope of the embodiments of the present application and are intended to be included within the scope of the present application.
Claims (10)
1. An arc suppression inverter control method is used for realizing arc suppression of a single-phase earth fault point of a power grid through an arc suppression inverter and an arc suppression coil, the arc suppression inverter is a three-phase input single-phase output type inverter, and the method is characterized by comprising the following steps:
when a single-phase earth fault of a three-phase power grid is confirmed, a target amplitude instruction and a target phase instruction of output voltage of the arc suppression inverter are obtained, and when the arc suppression inverter outputs a target amplitude corresponding to the target amplitude instruction and a target phase voltage corresponding to the target phase instruction, the arc suppression coil outputs compensation current for suppressing an earth arc of an earth fault point;
adjusting the output voltage of the arc suppression inverter to a target amplitude and a target phase, wherein the adjusting the output voltage of the arc suppression inverter to the target phase comprises:
judging whether phase switching is needed or not according to the phase sequence of the three-phase voltage of the three-phase power grid and a target phase instruction;
when the phase switching is required, calculating a phase switching angle according to the current phase sequence of the three-phase power grid and a target phase corresponding to the target phase instruction;
and adjusting the phase of the output voltage once according to a preset step length when the phase of the output voltage of the arc extinction inverter crosses zero in each period, so that the phase of the output voltage of the arc extinction inverter is adjusted in place after one period.
2. The arc extinction inverter control method according to claim 1, wherein determining whether phase switching is required according to a phase sequence of three-phase voltages of the three-phase grid and a target phase command includes:
acquiring a current voltage vector angle of the three-phase power grid, acquiring a voltage phase sequence of a current sampling time point according to the current voltage vector angle, recording a current tracking phase in real time and receiving a phase instruction to be tracked;
when the current tracking phase and the phase to be tracked are different, it is confirmed that phase switching is required.
3. The arc extinction inverter control method according to claim 1, wherein adjusting the phase of the output voltage once per cycle zero-crossing in a preset step at the output voltage phase of the arc extinction inverter comprises: adjusting the phase of the output voltage of the arc extinction inverter to a preset angle at each zero-crossing point of the output voltage.
4. The arc suppression inverter control method according to claim 1, wherein calculating a phase switching angle from a current phase sequence of the three-phase grid and a target phase corresponding to the target phase command includes:
when the voltage phase sequence of the last sampling time point is reversely switched to the voltage phase sequence of the current sampling time point, calculating a phase switching angle by using a reverse switching mark, wherein the reverse switching is that the voltage phase sequence is switched according to the sequence of A-C, C-B, B-A, the reverse switching mark Dir is-1, the phase switching angle alpha is Dir multiplied by beta, and the beta is a three-phase angle difference of 120 degrees;
when the voltage phase sequence at the last sampling time point is forward-switched to the voltage phase sequence at the current sampling time point, a forward switching flag is used to calculate a phase switching angle, wherein the forward switching is switched to the voltage phase sequence in the order of A-B, B-C, C-A, and the forward switching flag Dir is 1.
5. The arc suppression inverter control method according to claim 1, wherein adjusting the output voltage of the arc suppression inverter to a target magnitude includes: and adjusting the given voltage of the arc extinction inverter to be a target amplitude, and performing voltage-current closed-loop control according to the given voltage so as to adjust the amplitude of the output voltage of the arc extinction inverter to be the target amplitude.
6. An arc suppression inverter control method according to claim 1, characterized in that the method comprises:
sampling the voltage of a neutral point of the three-phase power grid, and comparing the voltage of the neutral point with a preset threshold voltage;
and when the voltage of the neutral point is greater than the preset threshold voltage, confirming that the three-phase power grid has a single-phase earth fault.
7. The arc suppression inverter control method according to claim 1, wherein the acquiring a target amplitude command and a target phase command of an output voltage of the arc suppression inverter includes:
detecting a distributed capacitance value of the three-phase power grid;
according to the distributed capacitance value, calculating an inductance current value of the arc suppression coil for extinguishing the grounding arc of the grounding fault point;
and obtaining a target amplitude instruction and a target phase instruction of the output voltage according to the inductance current value or in a real-time communication mode.
8. An arc extinction inverter control method according to claim 1, characterized in that a phase sequence of three phase voltages of the three phase grid is obtained by:
carrying out Clark conversion on the three-phase voltage of the three-phase power grid to obtain a power grid voltage vector angle;
and obtaining the phase sequence of the three-phase voltage according to the phase relation between the power grid vector angle and the three-phase voltage.
9. An arc suppressing inverter control apparatus characterized by comprising a memory and a processor, the memory having stored therein a computer program executable by the processor, and the processor realizing the steps of the arc suppressing inverter control method according to any one of claims 1 to 8 when executing the computer program.
10. A computer-readable storage medium, characterized in that the storage medium has stored thereon a computer program which, when being executed by a processor, carries out the steps of the arc suppression inverter control method according to any one of claims 1 to 8.
Priority Applications (1)
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