Converter valve control method, electronic equipment and computer readable storage medium

Abstract

The invention relates to the technical field of converter valves, and particularly provides a converter valve control method, electronic equipment and a computer readable storage medium, and the control method comprises the steps: determining the AC maximum current characteristic quantity of a converter valve based on the port current of the converter valve; based on the AC maximum current characteristic quantity, determining whether the converter valve has a fault; if not, the control strategy is not adopted, so that the converter valve continues to operate normally; if yes, obtaining active power and reactive power control models of the converter valve; adjusting a modulation voltage signal input to the converter valve based on the active power and reactive power control model to generate a target modulation voltage signal; and controlling the converter valve to operate based on the target modulation voltage signal. In this way, the converter valve can be controlled to operate safely and stably.

Description

Technical Field

[0001] The present invention relates to the technical field of converter valves, and in particular to a control method, electronic equipment and computer-readable storage medium for converter valves. Background Art

[0002] With the rapid development of the power industry, the pace of development of power transmission technology has also accelerated. High-voltage direct current transmission projects, as an important measure to optimize power transmission, have attracted widespread attention.

[0003] Converter valves play an important role in HVDC transmission systems. In actual DC transmission system projects, converter valves may operate abnormally due to system failures, resulting in DC blocking, unstable system operation, and other accidents. Therefore, how to ensure the safe operation of converter valves is the key to HVDC transmission projects.

[0004] However, current technology cannot effectively and timely control the safe and stable operation of the converter valve. How to control the safe and stable operation of the converter valve has become a problem that needs to be solved urgently. Summary of the invention

[0005] In view of this, the present invention provides a control method of a converter valve, an electronic device and a computer-readable storage medium, which can control the converter valve to operate safely and stably.

[0006] In order to solve the above technical problems, on the one hand, the present invention provides a control method for a converter valve, comprising: determining the AC maximum current characteristic quantity of the converter valve based on the port current of the converter valve; determining whether the converter valve has a fault based on the AC maximum current characteristic quantity; if not, not taking any control strategy so that the converter valve continues to operate normally; if so, obtaining the active power and reactive power control model of the converter valve; based on the active power and reactive power control model, adjusting the modulation voltage signal input to the converter valve to generate a target modulation voltage signal; and controlling the operation of the converter valve based on the target modulation voltage signal.

[0007] According to some embodiments of the present invention, the step of determining whether a converter valve is faulty based on the AC maximum current characteristic quantity includes: determining that the converter valve is faulty in response to the AC maximum current characteristic quantity being greater than or equal to a preset current threshold.

[0008] According to some embodiments of the present invention, the step of determining the AC maximum current characteristic value of the converter valve based on the port current of the converter valve includes: determining the AC maximum current characteristic value using the following formula (1):

[0009]

[0010] In the above formula (1), S m Refers to the maximum AC current characteristic quantity, ivm refers to the polarity current, |i a |,|i b |,|i c | is the absolute value of the three-phase AC current on the valve side of the converter valve.

[0011] According to some embodiments of the present invention, active power and reactive power control models are generated using the following steps: based on instantaneous reactive power theory, an initial power control model is constructed; the initial power control model is observed using a dual disturbance observer to generate disturbance observation values; based on the disturbance observation values ​​and the disturbance compensation function, the initial power control model is compensated to generate active power and reactive power control models.

[0012] According to some embodiments of the present invention, the initial power control model is compensated based on the disturbance observation value and the disturbance compensation function to generate the active power and reactive power control model, including: multiplying the disturbance compensation function with the disturbance observation value to obtain the compensation value; performing weighted summation of the compensation value and the initial power control model to generate the active power and reactive power control model.

[0013] According to some embodiments of the present invention, the initial power control model includes an initial active power model and an initial reactive power model, and the disturbance compensation function includes an active compensation sub-function and a reactive compensation sub-function; the step of performing weighted summation of the compensation value and the initial power control model to generate the active power and reactive power control model comprises: subtracting the reactive compensation value from the initial reactive power model to generate the reactive power control part in the active power and reactive power control model; wherein the reactive compensation value is a compensation value obtained by multiplying the disturbance observation value under the reactive power by the reactive compensation sub-function; adding the active compensation value to the initial active power model to generate the active power control part in the active power and reactive power control model; wherein the active compensation value is a compensation value obtained by multiplying the disturbance observation value under the active power by the active compensation sub-function.

[0014] According to some embodiments of the present invention, the initial power control model is shown in the following equation (2):

[0015]

[0016] Among them, in the above formula (2), P g is the initial active power model, q g is the initial reactive power model, P g0 , P gc2 , P gs2 To control the parameters of the initial active power model, q g0 ,q gc2 ,q gs3 To control the parameters of the initial reactive power model, ω is the fundamental angular frequency;

[0017] Where P g0 , P gc2 , P gs2 ,q g0 ,q gc2 ,q gs3 The expression of is shown in formula (3):

[0018]

[0019] Among them, in the above formula (3), are the positive sequence component and negative sequence component of the voltage at both ends of the converter valve, They are respectively the positive sequence component and negative sequence component of the current at both ends of the converter valve.

[0020] According to some embodiments of the present invention, the disturbance compensation function is shown in the following formula (5):

[0021]

[0022] In the above formula (5), G fd1 (s) is the active power compensation sub-function, G fd2 (s) is the reactive power compensation subfunction, T1 is the time constant under active power, T2 is the time constant under reactive power, and s is the differential operator.

[0023] According to some embodiments of the present invention, the disturbance observation value is shown in the following formula (4):

[0024]

[0025] In the above formula (4), w pg (s) is the actual interference amount under active power, is the disturbance observation value under active power, w qg (s) is the actual interference amount under reactive power, is the disturbance observation value under reactive power.

[0026] In a second aspect, an embodiment of the present invention provides an electronic device, comprising: a processor; and a memory, wherein computer program instructions are stored in the memory.

[0027] When the computer program instructions are executed by the processor, the processor executes the control method of the converter valve as shown in the above technical solution.

[0028] The above technical solution of the present invention has at least one of the following beneficial effects: by using the AC maximum current characteristic quantity to accurately analyze the operating status of the converter valve, and then when a fault is found in the converter valve, the active power and reactive power control model of the converter valve is used to intervene and control the converter valve in time, thereby achieving the effect of quickly controlling the safe and stable operation of the converter valve.

[0029] In addition, by using the instantaneous reactive power theory and the dual disturbance observer to perform passive power compensation control on the converter valve, the frequency-doubled active and reactive power fluctuation components of the converter valve under unbalanced grid voltage can be effectively suppressed, thereby improving the dynamic response performance of the system. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] Figure 1 is a flow chart of a control method for a converter valve according to an embodiment of the present invention;

[0031] Figure 2 A flowchart of the steps of obtaining the active power and reactive power control model of the converter valve in the control method of the converter valve according to an embodiment of the present invention;

[0032] Figure 3 Schematic diagram of an electronic device according to an embodiment of the present invention. DETAILED DESCRIPTION

[0033] The specific implementation of the present invention will be further described in detail below in conjunction with the accompanying drawings and examples. The following examples are used to illustrate the present invention, but are not intended to limit the scope of the present invention.

[0034] With the rapid development of the power industry, the pace of development of power transmission technology has also accelerated. High-voltage direct current transmission projects, as an important measure to optimize power transmission, have attracted widespread attention.

[0035] Converter valves play an important role in HVDC transmission systems. In actual DC transmission system projects, converter valves may operate abnormally due to system failures, resulting in DC blocking, unstable system operation, and other accidents. Therefore, how to ensure the safe operation of converter valves is the key to HVDC transmission projects.

[0036] However, current technology cannot effectively and timely control the safe and stable operation of the converter valve. How to control the safe and stable operation of the converter valve has become a problem that needs to be solved urgently.

[0037] In order to solve the above technical problems, an embodiment of the present application proposes a control method for a converter valve, which accurately analyzes the operating status of the converter valve by determining the AC maximum current characteristic quantity of the converter valve port, and then intervenes and controls the converter valve in time according to the operating status of the converter valve, thereby achieving the effect of controlling the safe and stable operation of the converter valve.

[0038] Before introducing the control method of the converter valve proposed in the embodiment of the present application, the relationship between the AC maximum current characteristic quantity and the converter valve operation state is described in detail below by taking the DC transmission system using a double-bridge 12-pulsation converter valve as a converter unit as an example. The double-bridge 12-pulsation converter valve is composed of two 6-pulsation converter valves with the same structure connected in series, and a single 6-pulsation converter valve includes 6 converter valves V1-V6.

[0039] First, under normal working conditions, the six converter valves will be turned on in turn, and their on and off states follow a periodic law and maintain a fixed timing relationship. In short, the operating characteristics of the converter valves under normal working conditions are relatively clear. However, once a fault occurs, the on and off states of these valves will lose their regularity and the timing relationship will be destroyed, which means that there is a problem with the commutation process of the converter valves, and the operating characteristics of the converter valves become unpredictable.

[0040] The converter valve is mainly composed of a series group of thyristors. In the absence of internal hardware failures, the operation mode of the converter valve is mainly controlled by the switching behavior of the thyristor. According to its inherent conductive characteristics, the thyristor can exhibit two static behaviors: the on state and the off state. Due to the inductance effect of the internal commutation circuit of the thyristor, these two states will go through a dynamic transition stage when switching, that is, the dynamic behavior of the thyristor turning on and off. Therefore, the thyristor can be expressed in four states in actual operation: start, conduction, shutdown and cutoff. By observing these operating states of the thyristor, we can understand the working condition of the converter valve.

[0041] According to whether the time width corresponding to each state (on state and off state) is too long or too short, the normal commutation (normal operation) and abnormal commutation (fault) of the converter valve can be distinguished. The key to whether the on state and the off state are too long or too short lies in whether there is a difference in the intersection of the currents of the two commutation valves during the commutation process or whether there is a commutation intersection. Therefore, the AC maximum current characteristic quantity constructed at the intersection of the equal currents of the two commutation valves has an obvious distinction between the time widths corresponding to the non-zero area and the zero area, so the AC maximum current characteristic quantity can be used to realize the discrimination of the working state of the converter valve.

[0042] The following is a detailed description of a control method for a converter valve proposed in an embodiment of the present application. Figure 1 The following steps are shown.

[0043] Step 110: Determine the AC maximum current characteristic value of the converter valve port based on the port current of the converter valve.

[0044] In one embodiment, the AC maximum current characteristic value can be determined using the following formula (1):

[0045]

[0046] In the above formula (1), S m Refers to the maximum AC current characteristic quantity, i vm refers to the polarity current, |i a |,|i b |,|i c | is the absolute value of the three-phase AC current on the valve side of the converter valve.

[0047] In this embodiment, the polarity current and the intersection current of the two phase-changing valves (i.e., 0.5max(|i a |,|i b |,|i c |)) ratio to construct the AC maximum current characteristic quantity of the converter valve port, which can reduce the impact of system operating conditions on the conduction width and the shutdown width, and improve the accuracy of subsequent converter valve fault judgment.

[0048] Step 120: Determine whether a converter valve fails based on the AC maximum current characteristic value.

[0049] By analyzing the characteristics of the AC maximum current characteristic quantity at the commutation intersection point, the operating state of the converter valve can be determined.

[0050] In one embodiment, whether the converter valve is faulty can be determined based on the magnitude of the AC maximum current characteristic quantity. Specifically, the AC maximum current characteristic quantity differs under normal operation of the converter valve and abnormal commutation (i.e., a fault occurs). Under normal working conditions, the amplitude of the AC maximum current characteristic quantity is half of the DC current, and the AC maximum current characteristic quantity of each converter valve presents the same waveform characteristics and changes periodically. However, when the commutation of the converter valve is abnormal, this periodicity will be disturbed, the AC maximum current characteristic quantity will no longer have regularity, and the fluctuation of the AC maximum current characteristic quantity may be too large.

[0051] In one embodiment, in response to the AC maximum current characteristic quantity being greater than or equal to a preset current threshold, it can be determined that the converter valve has a fault. The preset current threshold can be set based on the converter valve side current rating and the rated current value. In one example, the sum of the converter valve side current rating and 15% of the rated current value can be used as the preset current threshold. It can be understood that the present application is not limited to this, and the specific value of the preset current threshold can be set according to actual needs.

[0052] Step 130: If the converter valve has no fault, no control strategy is adopted, so that the converter valve continues to operate normally.

[0053] If there is no fault in the converter valve, it means that the converter valve is operating normally, so there is no need to intervene in the control of the converter valve. At this time, no control strategy is adopted to allow the converter valve to continue to operate normally.

[0054] Step 140: If a converter valve fails, the active power and reactive power control model of the converter valve is obtained; based on the active power and reactive power control model, the modulation voltage signal input to the converter valve is adjusted to generate a target modulation voltage signal; and the operation of the converter valve is controlled based on the target modulation voltage signal.

[0055] When a converter valve fails, it indicates that intervention control of the converter valve is required to restore the converter valve to normal operation. At this time, the modulated voltage signal input to the converter valve can be adjusted by pre-constructing the active power and reactive power control model of the converter valve, suppressing the frequency-multiplied fluctuation component of the output power of the grid-connected converter valve under unbalanced grid voltage, improving the dynamic response performance of the system, and outputting the target modulated voltage signal to control the normal operation of the converter valve.

[0056] This embodiment uses the AC maximum current characteristic quantity to accurately analyze the operating status of the converter valve. Then, when a fault is found in the converter valve, the active power and reactive power control model of the converter valve is used to intervene and control the converter valve in time, thereby achieving the effect of quickly controlling the safe and stable operation of the converter valve.

[0057] The steps of obtaining the active power and reactive power control model of the converter valve in the above step 140 are described in detail below.

[0058] In one embodiment, if Figure 2 As shown, the active power and reactive power control models can be generated using the following steps:

[0059] Step 210: construct an initial power control model based on instantaneous reactive power theory.

[0060] First, when a converter valve fails, the three-phase current can be expressed as the following formula (6).

[0061]

[0062] Among them, in the above formula (6), I + with I - They respectively represent the positive-sequence current component and negative-sequence current component of the converter valve current obtained, ω represents the system fundamental angular frequency, and t represents the acquisition time.

[0063] After transformation, the positive sequence current component and negative sequence current component of the three-phase current of the converter valve can be expressed as the following formula (7):

[0064]

[0065] In the above formula (7), i dq + 、i dq - They are respectively represented as the positive sequence component and negative sequence component of the q-axis current of the converter valve, I gs + ,I gs - They are respectively represented by the positive sequence component and negative sequence component of the converter valve current obtained by derivation, I gc + ,I gc - They represent the positive sequence component and negative sequence component of the converter output current respectively, and L is the time interval.

[0066] Combined with the instantaneous active power p and instantaneous reactive power q defined in the instantaneous reactive power theory, when the converter valve current fluctuates, a mathematical model of the converter valve control equation (i.e., the initial power control model) can be constructed based on the instantaneous reactive power theory, wherein the initial power control model may include an initial active power model and an initial reactive power model.

[0067] In one embodiment, the initial power control model is specifically shown in the following formula (2):

[0068]

[0069] Among them, in the above formula (2), P g is the initial active power model, q g is the initial reactive power model, P g0 , P gc2 , P gs2 To control the parameters of the initial active power model, q g0 ,q gc2 ,q gs3 To control the parameters of the initial reactive power model.

[0070] Where P g0 , P gc2 , P gs2 ,q g0 ,q gc2 ,q gs3 The expression of is shown in formula (3):

[0071]

[0072] Among them, in the above formula (3), are the positive sequence component and negative sequence component of the voltage at both ends of the converter valve, They are respectively the positive sequence component and negative sequence component of the current at both ends of the converter valve.

[0073] Step 220: Observe the initial power control model using a dual disturbance observer to generate disturbance observation values.

[0074] The dual disturbance observer can observe the active power model and the reactive power model at the same time. First, the observation error under reactive power (hereinafter referred to as "reactive observation error") and the observation error under active power (hereinafter referred to as "active observation error") are defined, as shown in the following formula (8):

[0075]

[0076] In the above formula (8), e wp is the active power observation error, e wq is the reactive power observation error, w pg is the actual interference under active power, w qg is the actual interference amount under reactive power, is the disturbance observation value under active power (generally the average value of the interference under active power), is the disturbance observation value under reactive power (generally the average value of the interference under reactive power).

[0077] Then the error equation of the dual disturbance observer can be derived as shown in the following equation (9):

[0078]

[0079] Among them, in the above formula (9), for e wp The derivative of for e wq The derivative of , I1 is the observation gain under active power (hereinafter referred to as “active observation gain”), and I2 is the observation gain under reactive power (hereinafter referred to as “reactive observation gain”).

[0080] The disturbance observation value can be further derived, as shown in the following formula (4):

[0081]

[0082] In the above formula (4), w pg (s) is the actual interference amount under active power, is the disturbance observation value under active power, w qg (s) is the actual interference amount under reactive power, is the disturbance observation value under reactive power, T1 is the time constant under active power, T2 is the time constant under reactive power, and s is the differential operator.

[0083] Where T1 = I1 / L, T2 = I2 / L. Generally speaking, the observation gain I of the double disturbance observer isj (j=1,2) should be greater than 0 to ensure that the error of the dual disturbance observer is asymptotically stable in the global range, so that the disturbance observation value observed by the dual disturbance observer approaches the actual value in an exponential form. In one embodiment, the value of the observation gain can be as large as possible to ensure that the dynamic response speed of the dual disturbance observer is faster than the response speed of the control system, thereby improving the observation speed and accuracy of the dual disturbance observer. It can be understood that the specific value of the observation gain can be set according to the actual situation and is not limited here.

[0084] Step 230: Based on the disturbance observation value and the disturbance compensation function, the initial power control model is compensated to generate active power and reactive power control models.

[0085] In one embodiment, the disturbance compensation function may include a reactive power compensation sub-function (i.e., a compensation function under reactive power) and an active power compensation sub-function (i.e., a compensation function under active power). The disturbance compensation function is shown in the following formula (5):

[0086]

[0087] Among them, in the above formula (5), G fd1 (s) is the active power compensation sub-function, G fd2 (s) is the reactive power compensation sub-function.

[0088] In this embodiment, the mathematical model of the converter valve under the unbalanced grid voltage is first constructed through the above step 210, and the control equation (i.e., the initial power control model) with the system frequency-multiplied power as the state variable under the unbalanced grid voltage is derived. Then, external disturbances such as system load fluctuations and power changes are determined through step 220. Finally, the unmodeled dynamics and errors of the system are described in the initial power control model through the disturbance compensation function and the disturbance observation value to obtain an accurate active power and reactive power control model. By using the instantaneous reactive power theory and the dual disturbance observer to perform passive power compensation control on the converter valve, the frequency-multiplied active and reactive power fluctuation components of the converter valve under the unbalanced grid voltage can be effectively suppressed, and the dynamic response performance of the system can be improved.

[0089] In one embodiment, the disturbance compensation function may be multiplied by the disturbance observation value to obtain a compensation value, and then the compensation value is weightedly summed with the initial power control model to generate an active power and reactive power control model.

[0090] In one example, the reactive power compensation value can be subtracted from the initial reactive power model to generate the reactive power control part in the active power and reactive power control model. The reactive power compensation value is the compensation value obtained by multiplying the disturbance observation value under the reactive power by the reactive compensation sub-function. The active power compensation value is added to the initial active power model to generate the active power control part in the active power and reactive power control model. The active power compensation value is the compensation value obtained by multiplying the disturbance observation value under the active power by the active power compensation sub-function.

[0091] Taking the initial power control model, disturbance observation value and disturbance compensation function shown in the above equations (2)-(5) as an example, through the above step 230, the active power and reactive power control model shown in the following equation (10) can be generated:

[0092]

[0093] In one embodiment, the stability analysis of the passive control strategy of the converter valve based on the dual disturbance observer proposed in the above steps 210 to 230 can also be performed to determine that different control parameters have a significant impact on the system performance, thereby selecting appropriate control parameters to ensure the best control effect of the system.

[0094] An embodiment of the present invention also provides an electronic device, which includes a processor and a memory, wherein the memory stores at least one instruction or at least one program, and the at least one instruction or the at least one program is loaded and executed by the processor to implement the control method of the converter valve provided in the above method embodiment.

[0095] The memory can be used to store software programs and modules. The processor executes various functional applications and data processing by running the software programs and modules 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, application programs required for functions, etc.; the data storage area can store data created according to the use of the device, etc. In addition, the memory can include a high-speed random access memory and can also include a non-volatile memory, such as at least one disk storage device, a flash memory device, or other volatile solid-state storage devices. Accordingly, the memory can also include a memory controller to provide the processor with access to the memory.

[0096] In a specific embodiment, Figure 3 A schematic diagram of the structure of an electronic device for implementing an embodiment of the present invention is shown. The electronic device may be a computer terminal, a mobile terminal or other devices.

[0097] like Figure 3As shown, an embodiment of the present invention provides an electronic device 300, including: a processor 301 and a memory 302, wherein computer program instructions are stored in the memory 302, wherein when the computer program instructions are executed by the processor, the processor 301 executes the control method of the converter valve as described in the above embodiment.

[0098] Furthermore, if Figure 3 As shown, the electronic device 300 further includes a network interface 303 , an input device 304 , a hard disk 305 , and a display device 306 .

[0099] The above-mentioned interfaces and devices can be interconnected through a bus architecture. The bus architecture can be a bus and bridge that can include any number of interconnected buses. Specifically, one or more central processing units (CPUs) represented by processor 301 and various circuits of one or more memories represented by memory 302 are connected together. The bus architecture can also connect various other circuits such as peripheral devices, voltage regulators, and power management circuits together. It can be understood that the bus architecture is used to achieve connection and communication between these components. In addition to the data bus, the bus architecture also includes a power bus, a control bus, and a status signal bus, which are all well known in the art, so they are not described in detail herein.

[0100] The network interface 303 can be connected to a network (such as the Internet, a local area network, etc.), obtain relevant data from the network, and save it in the hard disk 305.

[0101] The input device 304 can receive various instructions input by the operator and send them to the processor 301 for execution. The input device 304 can include a keyboard or a pointing device, such as a mouse, a trackball, a touch pad or a touch screen.

[0102] The display device 306 can display the result obtained by the processor 301 executing the instruction.

[0103] The memory 302 is used to store programs and data necessary for the operation of the operating system, as well as data such as intermediate results during the calculation process of the processor 301.

[0104] It is understood that the memory 302 in the embodiment of the present invention may be a volatile memory or a non-volatile memory, or may include both volatile and non-volatile memories. Among them, the non-volatile memory may be a read-only memory (ROM), a programmable read-only memory (PROM), an erasable programmable read-only memory (EPROM), an electrically erasable programmable read-only memory (EEPROM), or a flash memory. The volatile memory may be a random access memory (RAM), which is used as an external cache. The memory 302 of the apparatus and method described herein is intended to include, but is not limited to, these and any other suitable types of memory.

[0105] In some implementations, the memory 302 stores the following elements, executable modules or data structures, or a subset thereof, or an extended set thereof: an operating system 3021 and an application program 3022 .

[0106] The operating system 3021 includes various system programs, such as a framework layer, a core library layer, a driver layer, etc., which are used to implement various basic services and process hardware-based tasks. The application 3022 includes various application programs, such as a browser, etc., which are used to implement various application services. The program for implementing the method of the embodiment of the present invention can be included in the application 3022.

[0107] The processor 301 , when calling and executing the application and data stored in the memory 302 , specifically, the program or instruction stored in the application 3022 , executes the control method of the converter valve as described in the above embodiment.

[0108] The method disclosed in the above embodiment of the present invention can be applied to the processor 301, or implemented by the processor 301. The processor 301 may be an integrated circuit chip with signal processing capabilities. In the implementation process, each step of the above method can be completed by the hardware integrated logic circuit in the processor 301 or the instruction in the form of software. The above processor 301 can be a general processor, a digital signal processor (DSP), an application-specific integrated circuit (ASIC), a field-programmable gate array (FPGA) or other programmable logic devices, discrete gates or transistor logic devices, discrete hardware components, and can implement or execute the methods, steps and logic block diagrams disclosed in the embodiments of the present invention. The general processor can be a microprocessor or the processor can also be any conventional processor. The steps of the method disclosed in the embodiment of the present invention can be directly embodied as a hardware decoding processor to be executed, or the hardware and software modules in the decoding processor are combined to be executed. The software module can be located in a mature storage medium in the field such as a random access memory, a flash memory, a read-only memory, a programmable read-only memory or an electrically erasable programmable memory, a register, etc. The storage medium is located in the memory 302, and the processor 301 reads the information in the memory 302 and completes the steps of the above method in combination with its hardware.

[0109] It is understood that the embodiments described herein can be implemented in hardware, software, firmware, middleware, microcode or a combination thereof. For hardware implementation, the processing unit can be implemented in one or more application specific integrated circuits (ASICs), digital signal processors (DSPs), digital signal processing devices (DSPDs), programmable logic devices (PLDs), field programmable gate arrays (FPGAs), general purpose processors, controllers, microcontrollers, microprocessors, other electronic units for performing the functions described in the present application or a combination thereof.

[0110] For software implementation, the techniques described herein can be implemented by modules (e.g., procedures, functions, etc.) that perform the functions described herein. The software code can be stored in a memory and executed by a processor. The memory can be implemented in the processor or outside the processor.

[0111] In addition, an embodiment of the present invention further provides a computer-readable storage medium, wherein the computer-readable storage medium stores a computer program. When the computer program is executed by a processor, the processor executes the control method of the converter valve as described in the above embodiment.

[0112] In the several embodiments provided in the present application, it should be understood that the disclosed methods and devices can be implemented in other ways. For example, the device embodiments described above are only schematic. For example, the division of the units is only a logical function division. There may be other division methods in actual implementation, such as multiple units or components can be combined or integrated into another system, or some features can be ignored or not executed. Another point is that the mutual coupling or direct coupling or communication connection shown or discussed can be through some interfaces, indirect coupling or communication connection of devices or units, which can be electrical, mechanical or other forms.

[0113] In addition, each functional unit in each embodiment of the present invention may be integrated into one processing unit, or each unit may be physically included separately, or two or more units may be integrated into one unit. The above-mentioned integrated unit may be implemented in the form of hardware or in the form of hardware plus software functional units.

[0114] The above-mentioned integrated unit implemented in the form of a software functional unit can be stored in a computer-readable storage medium. The above-mentioned software functional unit is stored in a storage medium, including a number of instructions for a computer device (which can be a personal computer, a server, or a network device, etc.) to perform some steps of the sending and receiving method described in each embodiment of the present invention. The aforementioned storage medium includes: U disk, mobile hard disk, read-only memory (Read-Only Memory, referred to as ROM), random access memory (RandomAccess Memory, referred to as RAM), disk or optical disk and other media that can store program codes.

[0115] The above is a preferred embodiment of the present invention. It should be pointed out that for ordinary technicians in this technical field, several improvements and modifications can be made without departing from the principles of the present invention. These improvements and modifications should also be regarded as the scope of protection of the present invention.

Claims

1. A control method for a converter valve, characterized in that: The steps include: Determining an AC maximum current characteristic value of the converter valve based on a port current of the converter valve; Determining whether the converter valve fails based on the AC maximum current characteristic value; If not, no control strategy is adopted, so that the converter valve continues to operate normally; If yes, then obtain the active power and reactive power control model of the converter valve; based on the active power and reactive power control model, adjust the modulation voltage signal input to the converter valve to generate a target modulation voltage signal; The operation of the converter valve is controlled based on the target modulation voltage signal.

2. The control method of the converter valve according to claim 1, characterized in that: The step of determining whether the converter valve fails based on the AC maximum current characteristic quantity comprises: In response to the AC maximum current characteristic quantity being greater than or equal to a preset current threshold, it is determined that the converter valve fails.

3. The control method of the converter valve according to claim 1, characterized in that: The step of determining the AC maximum current characteristic value of the converter valve based on the port current of the converter valve comprises: The AC maximum current characteristic quantity is determined by the following formula (1): In the above formula (1), S m Refers to the maximum AC current characteristic quantity, i vm refers to the polarity current, |i a |,|i b |,|i c | is the absolute value of the three-phase AC current on the valve side of the converter valve.

4. The control method of the converter valve according to claim 1, characterized in that: The active power and reactive power control model is generated using the following steps: Based on the instantaneous reactive power theory, the initial power control model is constructed; Observing the initial power control model using a dual disturbance observer to generate a disturbance observation value; Based on the disturbance observation value and the disturbance compensation function, the initial power control model is compensated to generate the active power and reactive power control model.

5. The control method of the converter valve according to claim 4, characterized in that: The step of compensating the initial power control model based on the disturbance observation value and the disturbance compensation function to generate the active power and reactive power control model comprises: Multiplying the disturbance compensation function by the disturbance observation value to obtain a compensation value; The compensation value and the initial power control model are weightedly summed to generate the active power and reactive power control model.

6. The control method of the converter valve according to claim 5, characterized in that: The initial power control model includes an initial active power model and an initial reactive power model, and the disturbance compensation function includes an active compensation sub-function and a reactive compensation sub-function; The step of performing weighted summation of the compensation value and the initial power control model to generate the active power and reactive power control model comprises: Subtracting the reactive compensation value from the initial reactive power model to generate the reactive power control part in the active power and reactive power control model; wherein the reactive compensation value is the compensation value obtained by multiplying the disturbance observation value under reactive power by the reactive compensation sub-function; The active power compensation value is added to the initial active power model to generate the active power control part in the active power and reactive power control model; wherein the active power compensation value is the compensation value obtained by multiplying the disturbance observation value under the active power by the active power compensation sub-function.

7. The control method of the converter valve according to claim 6, characterized in that: The initial power control model is shown in the following formula (2): Among them, in the above formula (2), P g is the initial active power model, q g is the initial reactive power model, P g0 , P gc2 , P gs2 To control the parameters of the initial active power model, q g0 ,q gc2 ,q gs3 To control the parameters of the initial reactive power model, ω is the fundamental angular frequency; Where P g0 , P gc2 , P gs2 ,q g0 ,q gc2 ,q gs3 The expression of is shown in the following formula (3): Among them, in the above formula (3), are the positive sequence component and negative sequence component of the voltage at both ends of the converter valve, They are respectively the positive sequence component and negative sequence component of the current at both ends of the converter valve.

8. The control method of the converter valve according to claim 6, characterized in that: The disturbance compensation function is shown in the following formula (5): Among them, in the above formula (5), G fd1 (s) is the active power compensation sub-function, G fd2 (s) is the reactive power compensation subfunction, T1 is the time constant under active power, T2 is the time constant under reactive power, and s is the differential operator.

9. The control method of the converter valve according to claim 4, characterized in that: The disturbance observation value is shown in the following formula (4): In the above formula (4), w pg (s) is the actual interference amount under active power, is the disturbance observation value under active power, w qg (s) is the actual interference amount under reactive power, is the disturbance observation value under reactive power.

10. An electronic device, characterized in that: include: processor; and a memory having computer program instructions stored therein, Wherein, when the computer program instructions are executed by the processor, the processor executes the control method of the converter valve according to any one of claims 1 to 9.

Images