Converter reactive power stop control method and device, terminal equipment and storage medium

Abstract

The invention discloses a reactive power shutdown control method and device for a converter, terminal equipment and a storage medium, and the method comprises the steps: obtaining the terminal voltage recovery rate of the converter at the current moment, the first terminal voltage at the current moment, the second terminal voltage at the previous moment, and the control time delay of the converter; according to the generator terminal voltage recovery rate, the first generator terminal voltage, the second generator terminal voltage and the control time delay, calculating a third generator terminal voltage of the converter at the first moment; wherein the first moment is a future moment which is separated from the current moment by the control time delay; and when the third terminal voltage is greater than or equal to a preset voltage threshold value, controlling the converter to stop emitting reactive current. The reactive current is adaptively controlled to stop according to the voltage recovery condition, the time of a reactive current stop instruction is given in advance at a proper time, and the problem of transient voltage reverse adjustment caused by excessive support of the reactive current is solved.

Description

Technical Field

[0001] The present invention relates to the technical field of converter fault ride-through control, and in particular to a converter reactive power stop control method, device, terminal equipment and storage medium. Background Art

[0002] During the high-voltage direct current transmission process, when the DC fails to commutate or locks out, it is easy to cause the voltage at the inverter end of the new energy power generation equipment to be too low. At this time, the equipment needs to enter the low voltage ride-through mode and inject reactive current into the system to help restore the voltage.

[0003] However, due to the delay in low voltage ride-through control, when the system fault is cleared and the voltage is restored, the reactive power generation cannot be stopped immediately, resulting in reactive power surplus and causing transient voltage "reverse regulation". Summary of the invention

[0004] The present invention provides a method, device, terminal equipment and storage medium for controlling reactive power stop of a converter, so as to solve the technical problem that the prior art cannot adaptively control the stop of reactive power generation according to the actual voltage recovery situation.

[0005] In order to solve the above technical problems, an embodiment of the present invention provides a method for controlling reactive power stop of a converter, comprising:

[0006] Obtaining a terminal voltage recovery rate of the converter at a current moment, a first terminal voltage at a current moment, a second terminal voltage at a previous moment, and a control delay of the converter;

[0007] Calculate the third machine-end voltage of the converter at the first moment according to the machine-end voltage recovery rate, the first machine-end voltage, the second machine-end voltage and the control delay; wherein the first moment is a future moment separated from the current moment by the control delay;

[0008] When the third machine terminal voltage is greater than or equal to a preset voltage threshold, the converter is controlled to stop generating reactive current.

[0009] As a preferred solution, the calculating of the third machine-end voltage of the converter at the first moment according to the machine-end voltage recovery rate, the first machine-end voltage, the second machine-end voltage and the control delay includes:

[0010] Repeat the voltage recovery value calculation operation until the voltage corresponding to the first moment is calculated and obtained as the third machine-end voltage;

[0011] The voltage recovery value calculation operation includes:

[0012] Calculate the second voltage recovery rate corresponding to the next moment of the iteration moment according to the first voltage recovery rate corresponding to the iteration moment, the first voltage corresponding to the iteration moment, and the second voltage corresponding to the moment before the iteration moment; wherein, when the voltage recovery value calculation operation is performed for the first time, the corresponding iteration moment is the current moment, the first voltage recovery rate is the machine-end voltage recovery rate, the first voltage is the first machine-end voltage, and the second voltage is the second machine-end voltage;

[0013] Calculating a third voltage corresponding to a next moment of an iteration moment according to the second voltage recovery rate and the first voltage;

[0014] The next moment after the iteration moment is taken as a new iteration moment, the second voltage recovery rate is taken as a new first voltage recovery rate; the first voltage is taken as a new second voltage; and the third voltage is taken as a new first voltage.

[0015] As a preferred solution, the calculation formula for the second voltage recovery rate is:

[0016]

[0017] Wherein, t1 represents the iteration time; Δt represents the time interval between adjacent moments; ΔV(t1+Δt) represents the second voltage recovery rate corresponding to the next moment of the iteration time; ΔV(t1) represents the first voltage recovery rate corresponding to the iteration time; U(t1) represents the first voltage corresponding to the iteration time; U(t1-Δt) represents the second voltage corresponding to the previous moment of the iteration time.

[0018] As a preferred solution, the calculating, according to the second voltage recovery rate and the first voltage, a third voltage corresponding to a next moment of an iteration moment includes:

[0019] Calculating a voltage recovery value corresponding to a next moment of an iteration according to the second voltage recovery rate;

[0020] Calculating a third voltage corresponding to a next moment of an iteration moment according to the voltage recovery value and the first voltage;

[0021] The calculation formula of the voltage recovery value is:

[0022] ΔU(t1+Δt)=ΔV(t1+Δt)×Δt;

[0023] Wherein, t1 represents the iteration time; Δt represents the time interval between adjacent moments; ΔU(t1+Δt) represents the voltage recovery value corresponding to the next moment of the iteration time; ΔV(t1+Δt) represents the second voltage recovery rate corresponding to the next moment of the iteration time;

[0024] The calculation formula of the third voltage is:

[0025] U(t1+Δt)=U(t1)+ΔU(t1+Δt);

[0026] In the formula, U(t1+Δt) represents the third voltage corresponding to the next moment of the iteration moment; U(t1) represents the first voltage corresponding to the iteration moment.

[0027] On the basis of the above-mentioned embodiment, another embodiment of the present invention provides a reactive power stop control device for a converter, comprising: a data acquisition module and a reactive power stop control module;

[0028] The data acquisition module is used to acquire the terminal voltage recovery rate of the converter at the current moment, the first terminal voltage at the current moment, the second terminal voltage at the previous moment and the control delay of the converter;

[0029] The reactive power stop control module is used to calculate the third machine-end voltage of the converter at the first moment according to the machine-end voltage recovery rate, the first machine-end voltage, the second machine-end voltage and the control delay; when the third machine-end voltage is greater than or equal to a preset voltage threshold, the converter is controlled to stop emitting reactive current; wherein the first moment is a future moment separated from the current moment by the control delay.

[0030] As a preferred solution, the calculating of the third machine-end voltage of the converter at the first moment according to the machine-end voltage recovery rate, the first machine-end voltage, the second machine-end voltage and the control delay includes:

[0031] Repeat the voltage recovery value calculation operation until the voltage corresponding to the first moment is calculated and obtained as the third machine-end voltage;

[0032] The voltage recovery value calculation operation includes:

[0033] Calculate the second voltage recovery rate corresponding to the next moment of the iteration moment according to the first voltage recovery rate corresponding to the iteration moment, the first voltage corresponding to the iteration moment, and the second voltage corresponding to the moment before the iteration moment; wherein, when the voltage recovery value calculation operation is performed for the first time, the corresponding iteration moment is the current moment, the first voltage recovery rate is the machine-end voltage recovery rate, the first voltage is the first machine-end voltage, and the second voltage is the second machine-end voltage;

[0034] Calculating a third voltage corresponding to a next moment of an iteration moment according to the second voltage recovery rate and the first voltage;

[0035] The next moment after the iteration moment is taken as a new iteration moment, the second voltage recovery rate is taken as a new first voltage recovery rate; the first voltage is taken as a new second voltage; and the third voltage is taken as a new first voltage.

[0036] As a preferred solution, the calculation formula for the second voltage recovery rate is:

[0037]

[0038] Wherein, t1 represents the iteration time; Δt represents the time interval between adjacent moments; ΔV(t1+Δt) represents the second voltage recovery rate corresponding to the next moment of the iteration time; ΔV(t1) represents the first voltage recovery rate corresponding to the iteration time; U(t1) represents the first voltage corresponding to the iteration time; U(t1-Δt) represents the second voltage corresponding to the previous moment of the iteration time.

[0039] As a preferred solution, the calculating, according to the second voltage recovery rate and the first voltage, a third voltage corresponding to a next moment of an iteration moment includes:

[0040] Calculating a voltage recovery value corresponding to a next moment of an iteration according to the second voltage recovery rate;

[0041] Calculating a third voltage corresponding to a next moment of an iteration moment according to the voltage recovery value and the first voltage;

[0042] The calculation formula of the voltage recovery value is:

[0043] ΔU(t1+Δt)=ΔV(t1+Δt)×Δt;

[0044] Wherein, t1 represents the iteration time; Δt represents the time interval between adjacent moments; ΔU(t1+Δt) represents the voltage recovery value corresponding to the next moment of the iteration time; ΔV(t1+Δt) represents the second voltage recovery rate corresponding to the next moment of the iteration time;

[0045] The calculation formula of the third voltage is:

[0046] U(t1+Δt)=U(t1)+ΔU(t1+Δt);

[0047] In the formula, U(t1+Δt) represents the third voltage corresponding to the next moment of the iteration moment; U(t1) represents the first voltage corresponding to the iteration moment.

[0048] Based on the above embodiments, another embodiment of the present invention provides a terminal device, which includes a processor, a memory, and a computer program stored in the memory and configured to be executed by the processor, and when the processor executes the computer program, the converter reactive power shutdown control method described in the above invention embodiment is implemented.

[0049] Based on the above embodiments, another embodiment of the present invention provides a storage medium, which includes a stored computer program, wherein when the computer program is running, the device where the storage medium is located is controlled to execute the converter reactive power shutdown control method described in the above invention embodiment.

[0050] Compared with the prior art, the embodiments of the present invention have the following beneficial effects:

[0051] The present invention obtains the machine-end voltage recovery rate of the converter at the current moment, the first machine-end voltage at the current moment, the second machine-end voltage at the previous moment and the control delay of the converter; according to the machine-end voltage recovery rate, the first machine-end voltage, the second machine-end voltage and the control delay, the third machine-end voltage of the converter at the first moment is calculated; wherein, the first moment is a future moment separated from the current moment by the control delay; when the third machine-end voltage is greater than or equal to a preset voltage threshold, the converter is controlled to stop emitting reactive current. The present invention predicts the machine-end voltage at a future moment in advance at the current moment. If the machine-end voltage at a future moment separated from the current moment by the control delay reaches the standard for stopping the generation of reactive power, the generation of reactive current is stopped in advance at the current moment, thereby improving the transient voltage "reverse regulation" problem caused by excessive support of reactive current due to the delay in low voltage ride-through control. BRIEF DESCRIPTION OF THE DRAWINGS

[0052] Figure 1 It is a flow chart of a method for controlling reactive power stop of a converter provided by an embodiment of the present invention;

[0053] Figure 2 It is a structural schematic diagram of a converter reactive power stop control device provided by one embodiment of the present invention. DETAILED DESCRIPTION

[0054] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0055] Embodiment 1

[0056] Please refer to Figure 1, is a flow chart of a method for controlling reactive power shutdown of a converter provided by an embodiment of the present invention, comprising:

[0057] S1. Obtaining a terminal voltage recovery rate of the converter at a current moment, a first terminal voltage at a current moment, a second terminal voltage at a previous moment, and a control delay of the converter.

[0058] It should be noted that the purpose of the present invention is to adaptively control the cessation of reactive current according to the voltage recovery situation during the low voltage ride-through of the transformer, so as to improve the transient voltage fluctuation suppression effect of the converter.

[0059] Before the present invention is implemented, it is necessary to test the response speed of the reactive current command of the converter in advance and estimate the control delay T of the converter. d .

[0060] The terminal voltage recovery value of the converter at the current moment can be calculated by the first terminal voltage at the current moment and the second terminal voltage at the previous moment. The calculation formula is as follows:

[0061]

[0062] In the formula, ΔV(t0) represents the terminal voltage recovery rate at the current moment; t0 represents the current moment; Δt represents the time interval between adjacent moments; U(t0) represents the first terminal voltage at the current moment; U(t0-Δt) represents the second terminal voltage at the previous moment.

[0063] The time interval is generally set to 1ms.

[0064] S2. Calculate the third machine-end voltage of the converter at the first moment according to the machine-end voltage recovery rate, the first machine-end voltage, the second machine-end voltage and the control delay; wherein the first moment is a future moment that is separated from the current moment by the control delay.

[0065] It should be noted that the first moment refers to the moment after the control delay T based on the current moment t0. d The moment after, that is, t0+T d .

[0066] In a preferred embodiment, the calculating the third machine terminal voltage of the converter at the first moment according to the machine terminal voltage recovery rate, the first machine terminal voltage, the second machine terminal voltage and the control delay includes:

[0067] Repeat the voltage recovery value calculation operation until the voltage corresponding to the first moment is calculated and obtained as the third machine-end voltage;

[0068] The voltage recovery value calculation operation includes:

[0069] Calculate the second voltage recovery rate corresponding to the next moment of the iteration moment according to the first voltage recovery rate corresponding to the iteration moment, the first voltage corresponding to the iteration moment, and the second voltage corresponding to the moment before the iteration moment; wherein, when the voltage recovery value calculation operation is performed for the first time, the corresponding iteration moment is the current moment, the first voltage recovery rate is the machine-end voltage recovery rate, the first voltage is the first machine-end voltage, and the second voltage is the second machine-end voltage;

[0070] Calculating a third voltage corresponding to a next moment of an iteration moment according to the second voltage recovery rate and the first voltage;

[0071] The next moment after the iteration moment is taken as a new iteration moment, the second voltage recovery rate is taken as a new first voltage recovery rate; the first voltage is taken as a new second voltage; and the third voltage is taken as a new first voltage.

[0072] In this embodiment, in each voltage recovery value calculation operation, assuming that the iteration time of this iteration is t1, the second voltage recovery rate ΔV(t1+Δt) at time t1+Δt is calculated based on the first voltage recovery rate ΔV(t1) at time t1, the first voltage U(t1) at time t1, and the second voltage U(t1-Δt) at time t1-Δt; then, based on ΔV(t1+Δt) and U(t1), the third voltage U(t1+Δt) at time t1+Δt is calculated.

[0073] In iteration after iteration, and by analogy, the voltage at the first moment can be continuously calculated and obtained, and the voltage at the first moment can be used as the third machine-end voltage.

[0074] In a preferred embodiment, the calculation formula of the second voltage recovery rate is:

[0075]

[0076] Wherein, t1 represents the iteration time; Δt represents the time interval between adjacent moments; ΔV(t1+Δt) represents the second voltage recovery rate corresponding to the next moment of the iteration time; ΔV(t1) represents the first voltage recovery rate corresponding to the iteration time; U(t1) represents the first voltage corresponding to the iteration time; U(t1-Δt) represents the second voltage corresponding to the previous moment of the iteration time.

[0077] It should be noted that during low voltage ride-through, the converter provides reactive current to help the machine-end voltage recover. The machine-end voltage recovery rate can be approximately considered to be proportional to the reactive current value.

[0078] The reactive current reference value generated by the converter can be determined by the following formula:

[0079] Iq,ref = k(1-U);

[0080] In the formula, I q,ref It represents the reactive current reference value; U represents the terminal voltage; k can be taken as 1.5 to 10 based on experience.

[0081] From the above formula, we can see that as the terminal voltage gradually recovers, the difference between the terminal voltage and the rated voltage gradually decreases, resulting in a gradual decrease in reactive current. Therefore, the decay rate of the terminal voltage recovery rate is proportional to the decrease in the rated voltage difference. In addition, since the reactive current value of each segment Δt needs to be calculated based on the terminal voltage of the previous segment Δt, the voltage recovery rate within the next Δt can be estimated by the following formula:

[0082]

[0083] The voltage recovery rate calculation formula uses per unit value, where 1 represents the per unit value of the rated voltage.

[0084] In a preferred embodiment, the calculating, according to the second voltage recovery rate and the first voltage, a third voltage corresponding to a next moment of an iteration moment includes:

[0085] Calculating a voltage recovery value corresponding to a next moment of an iteration according to the second voltage recovery rate;

[0086] Calculating a third voltage corresponding to a next moment of an iteration moment according to the voltage recovery value and the first voltage;

[0087] The calculation formula of the voltage recovery value is:

[0088] ΔU(t1+Δt)=ΔV(t1+Δt)×Δt;

[0089] Wherein, t1 represents the iteration time; Δt represents the time interval between adjacent moments; ΔU(t1+Δt) represents the voltage recovery value corresponding to the next moment of the iteration time; ΔV(t1+Δt) represents the second voltage recovery rate corresponding to the next moment of the iteration time;

[0090] The calculation formula of the third voltage is:

[0091] U(t1+Δt)=U(t1)+ΔU(t1+Δt);

[0092] In the formula, U(t1+Δt) represents the third voltage corresponding to the next moment of the iteration moment; U(t1) represents the first voltage corresponding to the iteration moment.

[0093] S3. When the third machine terminal voltage is greater than or equal to a preset voltage threshold, the converter is controlled to stop emitting reactive current.

[0094] It should be noted that the basic principle of the converter reactive power stop control method proposed in the present invention is to estimate the voltage recovery rate after the control delay T according to the real-time terminal voltage recovery rate. d The terminal voltage of the rear converter is used to determine whether it is necessary to stop generating reactive current at the current moment.

[0095] In step S3, the voltage threshold is generally set to 1 p.u., when the third terminal voltage, and after a control delay T d When the terminal voltage after the power supply is greater than or equal to 1p.u., the reactive current can be stopped immediately at the current moment. Generally, the reactive current stop is controlled by issuing a reactive current support stop command.

[0096] The present invention predicts the voltage recovery during the fault low-voltage ride-through period and the fault voltage recovery rate control delay period, thereby issuing the time to stop issuing reactive current instructions in advance at an appropriate time, thereby improving the transient voltage "reverse regulation" problem caused by excessive reactive current support.

[0097] Embodiment 2

[0098] Please refer to Figure 2 , is a schematic structural diagram of a reactive power stop control device for a converter provided by an embodiment of the present invention, comprising: a data acquisition module and a reactive power stop control module;

[0099] The data acquisition module is used to acquire the terminal voltage recovery rate of the converter at the current moment, the first terminal voltage at the current moment, the second terminal voltage at the previous moment and the control delay of the converter;

[0100] The reactive power stop control module is used to calculate the third machine-end voltage of the converter at the first moment according to the machine-end voltage recovery rate, the first machine-end voltage, the second machine-end voltage and the control delay; when the third machine-end voltage is greater than or equal to a preset voltage threshold, the converter is controlled to stop emitting reactive current; wherein the first moment is a future moment separated from the current moment by the control delay.

[0101] In a preferred embodiment, the calculating the third machine terminal voltage of the converter at the first moment according to the machine terminal voltage recovery rate, the first machine terminal voltage, the second machine terminal voltage and the control delay includes:

[0102] Repeat the voltage recovery value calculation operation until the voltage corresponding to the first moment is calculated and obtained as the third machine-end voltage;

[0103] The voltage recovery value calculation operation includes:

[0104] Calculate the second voltage recovery rate corresponding to the next moment of the iteration moment according to the first voltage recovery rate corresponding to the iteration moment, the first voltage corresponding to the iteration moment, and the second voltage corresponding to the moment before the iteration moment; wherein, when the voltage recovery value calculation operation is performed for the first time, the corresponding iteration moment is the current moment, the first voltage recovery rate is the machine-end voltage recovery rate, the first voltage is the first machine-end voltage, and the second voltage is the second machine-end voltage;

[0105] Calculating a third voltage corresponding to a next moment of an iteration moment according to the second voltage recovery rate and the first voltage;

[0106] The next moment after the iteration moment is taken as a new iteration moment, the second voltage recovery rate is taken as a new first voltage recovery rate; the first voltage is taken as a new second voltage; and the third voltage is taken as a new first voltage.

[0107] In a preferred embodiment, the calculation formula of the second voltage recovery rate is:

[0108]

[0109] Wherein, t1 represents the iteration time; Δt represents the time interval between adjacent moments; ΔV(t1+Δt) represents the second voltage recovery rate corresponding to the next moment of the iteration time; ΔV(t1) represents the first voltage recovery rate corresponding to the iteration time; U(t1) represents the first voltage corresponding to the iteration time; U(t1-Δt) represents the second voltage corresponding to the previous moment of the iteration time.

[0110] In a preferred embodiment, the calculating, according to the second voltage recovery rate and the first voltage, a third voltage corresponding to a next moment of an iteration moment includes:

[0111] Calculating a voltage recovery value corresponding to a next moment of an iteration according to the second voltage recovery rate;

[0112] Calculating a third voltage corresponding to a next moment of an iteration moment according to the voltage recovery value and the first voltage;

[0113] The calculation formula of the voltage recovery value is:

[0114] ΔU(t1+Δt)=ΔV(t1+Δt)×Δt;

[0115] Wherein, t1 represents the iteration time; Δt represents the time interval between adjacent moments; ΔU(t1+Δt) represents the voltage recovery value corresponding to the next moment of the iteration time; ΔV(t1+Δt) represents the second voltage recovery rate corresponding to the next moment of the iteration time;

[0116] The calculation formula of the third voltage is:

[0117] U(t1+Δt)=U(t1)+ΔU(t1+Δt);

[0118] In the formula, U(t1+Δt) represents the third voltage corresponding to the next moment of the iteration moment; U(t1) represents the first voltage corresponding to the iteration moment.

[0119] Embodiment 3

[0120] Accordingly, an embodiment of the present invention provides a terminal device, which includes a processor, a memory, and a computer program stored in the memory and configured to be executed by the processor, and when the processor executes the computer program, the converter reactive power shutdown control method described in the above-mentioned embodiment of the invention is implemented.

[0121] Embodiment 4

[0122] Accordingly, an embodiment of the present invention provides a storage medium, which includes a stored computer program, wherein when the computer program is running, the device where the storage medium is located is controlled to execute the converter reactive power shutdown control method described in the above-mentioned embodiment of the invention.

[0123] It should be noted that the device embodiments described above are merely schematic, wherein the units described as separate components may or may not be physically separated, and the components displayed as units may or may not be physical units, that is, they may be located in one place, or they may be distributed on multiple network units. Some or all of the modules may be selected according to actual needs to achieve the purpose of the scheme of this embodiment. In addition, in the accompanying drawings of the device embodiments provided by the present invention, the connection relationship between the modules indicates that there is a communication connection between them, which may be specifically implemented as one or more communication buses or signal lines. A person of ordinary skill in the art may understand and implement it without paying any creative effort.

[0124] Those skilled in the art can clearly understand that for the sake of convenience and brevity, the specific working process of the device described above can refer to the corresponding process in the aforementioned method embodiment, and will not be repeated here.

[0125] The terminal device may be a computing device such as a desktop computer, a notebook, a PDA, a cloud server, etc. The terminal device may include, but is not limited to, a processor and a memory.

[0126] The processor may be a central processing unit (CPU), or other general-purpose processors, digital signal processors (DSP), application-specific integrated circuits (ASIC), field-programmable gate arrays (FPGA) or other programmable logic devices, discrete gate or transistor logic devices, discrete hardware components, etc. A general-purpose processor may be a microprocessor or any conventional processor, etc. The processor is the control center of the device, and various interfaces and lines are used to connect various parts of the entire device.

[0127] The memory can be used to store the computer program, and the processor realizes various functions of the device by running or executing the computer program stored in the memory and calling the data stored in the memory. The memory can mainly include a program storage area and a data storage area, wherein the program storage area can store an operating system, at least one application required for a function, etc.; the data storage area can store data created according to the use of the mobile phone, etc. In addition, the memory can include a high-speed random access memory, and can also include a non-volatile memory, such as a hard disk, a memory, a plug-in hard disk, a smart memory card (Smart Media Card, SMC), a secure digital (Secure Digital, SD) card, a flash card (FlashCard), at least one disk storage device, a flash memory device, or other volatile solid-state storage devices.

[0128] The storage medium is a storage medium, and the computer program is stored in the storage medium. When the computer program is executed by the processor, the steps of each method embodiment described above can be implemented. Among them, the computer program includes computer program code, and the computer program code can be in source code form, object code form, executable file or some intermediate form, etc. The computer readable medium may include: any entity or device capable of carrying the computer program code, recording medium, USB flash drive, mobile hard disk, disk, optical disk, computer memory, read-only memory (ROM, Read-Only Memory), random access memory (RAM, Random Access Memory), electric carrier signal, telecommunication signal and software distribution medium, etc. It should be noted that the content contained in the computer readable medium can be appropriately increased or decreased according to the requirements of legislation and patent practice in the jurisdiction. For example, in some jurisdictions, according to legislation and patent practice, computer readable media do not include electric carrier signals and telecommunication signals.

[0129] The above is a preferred embodiment of the present invention. It should be pointed out that a person skilled in the art can make several improvements and modifications without departing from the principle of the present invention. These improvements and modifications are also considered to be within the scope of protection of the present invention.

Claims

1. A method for controlling reactive power stop of a converter, characterized in that: include: Obtaining a terminal voltage recovery rate of the converter at a current moment, a first terminal voltage at a current moment, a second terminal voltage at a previous moment, and a control delay of the converter; Calculate the third machine-end voltage of the converter at the first moment according to the machine-end voltage recovery rate, the first machine-end voltage, the second machine-end voltage and the control delay; wherein the first moment is a future moment separated from the current moment by the control delay; When the third machine terminal voltage is greater than or equal to a preset voltage threshold, the converter is controlled to stop generating reactive current.

2. The method for controlling the reactive power stop of a converter according to claim 1, characterized in that: The calculating, according to the machine-end voltage recovery rate, the first machine-end voltage, the second machine-end voltage and the control delay, a third machine-end voltage of the converter at the first moment comprises: Repeat the voltage recovery value calculation operation until the voltage corresponding to the first moment is calculated and obtained as the third machine-end voltage; The voltage recovery value calculation operation includes: Calculate the second voltage recovery rate corresponding to the next moment of the iteration moment according to the first voltage recovery rate corresponding to the iteration moment, the first voltage corresponding to the iteration moment, and the second voltage corresponding to the moment before the iteration moment; wherein, when the voltage recovery value calculation operation is performed for the first time, the corresponding iteration moment is the current moment, the first voltage recovery rate is the machine-end voltage recovery rate, the first voltage is the first machine-end voltage, and the second voltage is the second machine-end voltage; Calculating a third voltage corresponding to a next moment of an iteration moment according to the second voltage recovery rate and the first voltage; The next moment after the iteration moment is taken as a new iteration moment, the second voltage recovery rate is taken as a new first voltage recovery rate; the first voltage is taken as a new second voltage; and the third voltage is taken as a new first voltage.

3. The method for controlling reactive power stop of a converter according to claim 2, characterized in that: The calculation formula of the second voltage recovery rate is: Wherein, t1 represents the iteration time; Δt represents the time interval between adjacent moments; ΔV(t1+Δt) represents the second voltage recovery rate corresponding to the next moment of the iteration time; ΔV(t1) represents the first voltage recovery rate corresponding to the iteration time; U(t1) represents the first voltage corresponding to the iteration time; U(t1-Δt) represents the second voltage corresponding to the previous moment of the iteration time.

4. The method for controlling the reactive power stop of a converter according to claim 2, characterized in that: The calculating, according to the second voltage recovery rate and the first voltage, a third voltage corresponding to a next moment of an iteration moment comprises: Calculating a voltage recovery value corresponding to a next moment of an iteration according to the second voltage recovery rate; Calculating a third voltage corresponding to a next moment of an iteration moment according to the voltage recovery value and the first voltage; The calculation formula of the voltage recovery value is: ΔU(t1+Δt)=ΔV(t1+Δt)×Δt; Wherein, t1 represents the iteration time; Δt represents the time interval between adjacent moments; ΔU(t1+Δt) represents the voltage recovery value corresponding to the next moment of the iteration time; ΔV(t1+Δt) represents the second voltage recovery rate corresponding to the next moment of the iteration time; The calculation formula of the third voltage is: U(t1+Δt)=U(t1)+ΔU(t1+Δt); In the formula, U(t1+Δt) represents the third voltage corresponding to the next moment of the iteration moment; U(t1) represents the first voltage corresponding to the iteration moment.

5. A converter reactive power stop control device, characterized in that: include: Data acquisition module and reactive power stop control module; The data acquisition module is used to acquire the terminal voltage recovery rate of the converter at the current moment, the first terminal voltage at the current moment, the second terminal voltage at the previous moment and the control delay of the converter; The reactive power stop control module is used to calculate the third machine-end voltage of the converter at the first moment according to the machine-end voltage recovery rate, the first machine-end voltage, the second machine-end voltage and the control delay; when the third machine-end voltage is greater than or equal to a preset voltage threshold, the converter is controlled to stop emitting reactive current; wherein the first moment is a future moment separated from the current moment by the control delay.

6. The converter reactive power stop control device according to claim 5, characterized in that: The calculating, according to the machine-end voltage recovery rate, the first machine-end voltage, the second machine-end voltage and the control delay, a third machine-end voltage of the converter at the first moment comprises: Repeat the voltage recovery value calculation operation until the voltage corresponding to the first moment is calculated and obtained as the third machine-end voltage; The voltage recovery value calculation operation includes: Calculate the second voltage recovery rate corresponding to the next moment of the iteration moment according to the first voltage recovery rate corresponding to the iteration moment, the first voltage corresponding to the iteration moment, and the second voltage corresponding to the moment before the iteration moment; wherein, when the voltage recovery value calculation operation is performed for the first time, the corresponding iteration moment is the current moment, the first voltage recovery rate is the machine-end voltage recovery rate, the first voltage is the first machine-end voltage, and the second voltage is the second machine-end voltage; Calculating a third voltage corresponding to a next moment of an iteration moment according to the second voltage recovery rate and the first voltage; The next moment after the iteration moment is taken as a new iteration moment, the second voltage recovery rate is taken as a new first voltage recovery rate; the first voltage is taken as a new second voltage; and the third voltage is taken as a new first voltage.

7. The converter reactive power stop control device according to claim 6, characterized in that: The calculation formula of the second voltage recovery rate is: Wherein, t1 represents the iteration time; Δt represents the time interval between adjacent moments; ΔV(t1+Δt) represents the second voltage recovery rate corresponding to the next moment of the iteration time; ΔV(t1) represents the first voltage recovery rate corresponding to the iteration time; U(t1) represents the first voltage corresponding to the iteration time; U(t1-Δt) represents the second voltage corresponding to the previous moment of the iteration time.

8. The converter reactive power stop control device according to claim 6, characterized in that: The calculating, according to the second voltage recovery rate and the first voltage, a third voltage corresponding to a next moment of an iteration moment comprises: Calculating a voltage recovery value corresponding to a next moment of an iteration according to the second voltage recovery rate; Calculating a third voltage corresponding to a next moment of an iteration moment according to the voltage recovery value and the first voltage; The calculation formula of the voltage recovery value is: ΔU(t1+Δt)=ΔV(t1+Δt)×Δt; Wherein, t1 represents the iteration time; Δt represents the time interval between adjacent moments; ΔU(t1+Δt) represents the voltage recovery value corresponding to the next moment of the iteration time; ΔV(t1+Δt) represents the second voltage recovery rate corresponding to the next moment of the iteration time; The calculation formula of the third voltage is: U(t1+Δt)=U(t1)+ΔU(t1+Δt); In the formula, U(t1+Δt) represents the third voltage corresponding to the next moment of the iteration moment; U(t1) represents the first voltage corresponding to the iteration moment.

9. A terminal device, characterized in that: The method comprises a processor, a memory, and a computer program stored in the memory and configured to be executed by the processor, wherein when the processor executes the computer program, the method for controlling reactive power shutdown of a converter as claimed in any one of claims 1 to 7 is implemented.

10. A storage medium, characterized in that: The storage medium includes a stored computer program, wherein when the computer program is running, the device where the storage medium is located is controlled to execute the method for controlling reactive power shutdown of the converter according to any one of claims 1 to 7.

Images