A control method and device for a six-switch single-phase converter

Abstract

This invention provides a control method and apparatus for a six-switch single-phase converter. The method includes the following steps: using multiple power combinations calculated in the previous sampling period, predicting multiple power combinations for the current sampling period, wherein each power combination includes an active power and a corresponding reactive power; calculating the multiple converter output currents for the current sampling period; selecting the optimal solution for the power combinations and converter output currents of the current sampling period using a pre-established cost function, wherein the cost function is a linear combination of a power prediction cost function and a current prediction cost function; determining the switching state combination of the converter for the current sampling period using the optimal solution, and controlling the converter. This invention uses power and current predictions to determine the switching state combination, which not only reduces the computational load of the system but also improves the system's stability and accelerates its dynamic response capability.

Description

Technical Field

[0001] This invention relates to the field of control technology, specifically to a control method and device for a six-switch single-phase converter. Background Technology

[0002] Chinese patent CN112234809A discloses a circuit and method for eliminating secondary ripple in a single-phase back-to-back converter device. The circuit in this patent, as shown... Figure 1 As shown, the purpose is to utilize a novel single-phase back-to-back converter to address the issue of secondary ripple absorption in traditional single-phase back-to-back converters, which rely on large-capacity electrolytic capacitors. Unlike traditional single-phase back-to-back converters, this circuit has only two branches, with the rectifier and inverter sharing the intermediate switch in both branches. The entire circuit has only six switching devices. Compared to traditional single-phase back-to-back converters, this reduces the number of switches and overcomes the drawback of a large number of switching devices in traditional single-phase back-to-back converters.

[0003] For this six-switch circuit topology, the current technology still uses classic closed-loop control to control the circuit. However, since it is different from the traditional single-phase back-to-back converter circuit structure, the computational load, system stability, and dynamic response capability of the six-switch circuit topology need to be improved when using classic closed-loop control for system control. Summary of the Invention

[0004] Therefore, this invention aims to solve the technical problem that the existing technology uses classic closed-loop control to control a six-switch circuit, which results in a large amount of computation and requires improvement in system stability and dynamic response capability. Thus, this invention provides a six-switch single-phase converter control and device.

[0005] According to a first aspect, embodiments of the present invention provide a control method for a six-switch single-phase converter, comprising the following steps:

[0006] Using the multiple power combinations calculated in the previous sampling period, multiple power combinations for the current sampling period are predicted. Each power combination includes an active power and a corresponding reactive power.

[0007] Calculate the output current of multiple converters in the current sampling period;

[0008] The optimal solution for the power combination and the converter output current of the current sampling period is selected using a pre-established cost function, wherein the cost function is a linear combination of the power prediction cost function and the current prediction cost function.

[0009] The optimal solution is used to determine the switching state combination of the converter in the current sampling period, and the converter is controlled accordingly.

[0010] Optionally, the step of predicting multiple power combinations for the current sampling period using multiple power combinations calculated in the previous sampling period includes:

[0011] Obtain the actual input voltage on the grid side, the actual input current on the grid side, the actual active power on the grid side, the actual reactive power on the grid side, and the converter input voltage of the previous sampling period;

[0012] Orthogonal transformations are performed on the actual input voltage on the grid side, the actual input current on the grid side, and the input voltage of the converter, respectively, to obtain the transformed vectors of the actual input voltage on the grid side, the actual input current on the grid side, and the input voltage of the converter.

[0013] A power combination for the current sampling period is calculated based on the actual input voltage vector of the grid side, the input voltage vector of the converter, and the actual active power and reactive power of the grid side in the previous sampling period.

[0014] Optionally, the power combination for the current sampling period can be predicted using the following formula:

[0015]

[0016]

[0017] Wherein, P(k+1) is the predicted active power of the grid side in the current sampling period, Q(k+1) is the predicted reactive power of the grid side in the current sampling period, P(k) is the actual active power of the grid side in the previous sampling period, and Q(k) is the actual reactive power of the grid side in the previous sampling period, v gα (k), v gβ (k) represents the actual input voltage vector of the power grid side in the previous sampling period, u gα (k), u gβ (k) are all the converter input voltage vectors of the previous sampling period, L g R is the grid-side inductance. g Let ω be the grid-side resistance. g is a constant, and Ts is the sampling period.

[0018] Optionally, the output currents of multiple converters in the current sampling period can be calculated using the following formula:

[0019]

[0020] Among them, i oαβ (k+1) represents the converter output current during the current sampling period, u oαβ(k+1) represents the converter output voltage during the current sampling period, i oαβ (k) represents the actual output current of the converter in the previous sampling period, L o R is the load-side inductance. o The load-side resistance is denoted as .

[0021] Optionally, the actual output voltage of the converter satisfies the following relationship function:

[0022]

[0023] Among them, u oαβ i is the actual output voltage of the converter in the previous sampling period. oαβ The actual output current of the converter in the previous sampling period is given.

[0024] Optionally, the pre-established cost function is:

[0025]

[0026] Among them, P * For reference active power, Q * Reference reactive power, All are the target output current of the converter, i oα (k+1), i oβ (k+1) represents the converter output current during the current sampling period, and J is a variable.

[0027] According to a second aspect, embodiments of the present invention provide a six-switch single-phase converter control device, comprising:

[0028] The prediction module is used to predict multiple power combinations for the current sampling period using multiple power combinations calculated in the previous sampling period. Each power combination includes an active power and a corresponding reactive power.

[0029] The calculation module is used to calculate the output current of multiple converters in the current sampling period;

[0030] The solution module is used to select the optimal solution of the power combination and the converter output current of the current sampling period using a pre-established cost function, wherein the cost function is a linear combination of the power prediction cost function and the current prediction cost function.

[0031] The determination module is used to determine the switching state combination of the converter in the current sampling period using the optimal solution, and to control the converter.

[0032] Optionally, the prediction module further includes:

[0033] The acquisition module is used to acquire the actual input voltage on the grid side, the actual input current on the grid side, the actual active power on the grid side, the actual reactive power on the grid side, and the converter input voltage of the previous sampling period;

[0034] The transformation module is used to perform orthogonal transformations on the actual input voltage, actual input current, and converter input voltage of the grid side to obtain the transformed vectors of the actual input voltage, actual input current, and converter input voltage.

[0035] The combination module is used to calculate a power combination for the current sampling period based on the actual input voltage vector of the grid side, the input voltage vector of the converter, and the actual active power and reactive power of the grid side in the previous sampling period.

[0036] According to a third aspect, embodiments of the present invention provide an electronic device, including: a memory and a processor, wherein the memory and the processor are communicatively connected to each other, the memory stores computer instructions, and the processor executes the computer instructions to perform the above-described six-switch single-phase converter control method.

[0037] According to a fourth aspect, embodiments of the present invention provide a computer-readable storage medium storing computer instructions for causing the computer to execute the above-described six-switch single-phase converter control method.

[0038] The technical solution of this invention has the following advantages:

[0039] In this embodiment of the invention, the input voltage and current of the previous sampling period are detected and acquired. Multiple power combinations from the previous sampling period are calculated, and then multiple power combinations for the current sampling period are predicted, along with multiple converter output currents for the current sampling period. An optimal solution for the power combinations and converter output currents of the current sampling period is selected using a pre-established cost function. This optimal solution is then used to determine the switching state combination of the converter for the current sampling period, thereby controlling the converter. This embodiment of the invention does not employ a traditional dual-closed-loop control system. Instead, power and current prediction are used to predict the power combinations and converter output currents of the current sampling period. A cost function is established based on the prediction results to solve for the optimal voltage vector, controlling the switching state combination of the six-switch single-phase converter. Using power and current prediction to determine the switching state combination not only reduces the computational load of the system but also improves system stability and accelerates the system's dynamic response capability. Attached Figure Description

[0040] To more clearly illustrate the specific embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the specific embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of the present invention. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0041] Figure 1 A structural diagram of a specific example of a six-switch single-phase converter in the prior art;

[0042] Figure 2 This is a flowchart illustrating a specific example of a six-switch single-phase converter control method according to Embodiment 1 of the present invention;

[0043] Figure 3 This is a schematic diagram of controlling a six-switch single-phase converter in Embodiment 1 of the present invention;

[0044] Figure 4 This is a schematic block diagram of a specific example of a six-switch single-phase converter control device in Embodiment 2 of the present invention;

[0045] Figure 5 This is a schematic diagram of a specific example of an electronic device according to Embodiment 3 of the present invention. Detailed Implementation

[0046] The technical solution of the present invention will now be clearly and completely described with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0047] In the description of this invention, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing the invention and for simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on the invention. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0048] In the description of this invention, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can also refer to the internal connection of two components; and they can refer to a wireless connection or a wired connection. Those skilled in the art can understand the specific meaning of the above terms in this invention based on the specific circumstances.

[0049] Furthermore, the technical features involved in the different embodiments of the present invention described below can be combined with each other as long as they do not conflict with each other.

[0050] Example 1

[0051] This embodiment provides a control method for a six-switch single-phase converter. This control method can be executed by electronic devices such as processors and controllers. The electronic devices can detect and acquire current and voltage information of various parts of the six-switch single-phase converter, perform predictions and calculations to obtain the optimal solution. The electronic devices are also used to control the switching state combinations of the switching devices of the six-switch single-phase converter based on the obtained optimal solution, i.e., the optimal voltage vector, thereby realizing the control of the six-switch single-phase converter. Figure 2 As shown, it includes the following steps:

[0052] Step S101: Using the multiple power combinations calculated in the previous sampling period, predict the multiple power combinations for the current sampling period. Each power combination includes an active power and a corresponding reactive power.

[0053] like Figure 1 Or as shown in Figure 3, the grid-side inductance L and the grid-side inductance L g Grid-side resistance R g After being connected in series, it is connected to the six-switch single-phase converter. The output load side of the six-switch single-phase converter is connected to the load side inductor L. o Load-side voltage R o Series connection. Electronic devices can detect the voltage and current at any point in the six-switch single-phase converter topology, including the actual input voltage and current on the grid side, the converter input voltage, and the converter input current.

[0054] In this embodiment of the invention, if it is desired to predict multiple power combinations in a certain sampling period, it is necessary to first obtain the previous sampling period of the certain sampling period through electronic equipment, as well as the actual input voltage and current of the grid side, the actual output voltage and current of the converter, etc.

[0055] Calculate multiple power combinations using the previous sampling period; specifically, detect the actual grid-side input voltage v in the previous sampling period. g Actual input current i on the grid side g The actual input voltage v on the grid side g The actual input current i on the grid side g Perform orthogonal transformations respectively, and the transformed actual input voltage v on the grid side g The actual input voltage vector v on the grid side gα With v gβ That is, v gα v gβ Both are the actual input voltage vectors from the grid side as described in the previous sampling period. Further, v gα v gβ The vector sum is v gαβ In this embodiment, v gαβ This is also the actual input voltage vector of the grid side mentioned in the previous sampling period. Similarly, the transformed actual input current i of the grid side... g The actual input current vector i on the grid side gα with i gβ That is to say, i gα i gβ All are the actual input voltage vectors on the grid side as described in the previous sampling period. Further, i gα i gβ The vector sum is i gαβ In this embodiment, i gαβ This is also the actual input current vector on the grid side mentioned in the previous sampling period. The actual input voltage vector v on the grid side is obtained based on the transformation after detection. gα With v gβ The actual input current vector i on the grid side obtained after detection and transformation gα with i gβ The power combination for the previous sampling period is calculated as follows: The power combination includes the actual active power P and the actual reactive power Q on the grid side.

[0056] P = v gα i gα +v gβ i gβ (1)

[0057] Q = v gα i gα +v gβ i gβ (2)

[0058] In this embodiment, we first take a power combination as an example to predict a power combination in the current sampling period. Here, P represents the actual active power on the grid side in the previous sampling period, and Q represents the actual reactive power on the grid side in the previous sampling period.

[0059] Step S102: Calculate the multiple sets of converter output currents in the current sampling period;

[0060] Electronic devices can also detect the actual output voltage v on the load side of the converter in the previous sampling period. o and the actual output current i on the load side of the converter o As mentioned above, the actual input voltage v on the grid side in the previous sampling period is detected. g Actual input current i on the grid side g The actual input voltage v on the grid side g The actual input current i on the grid side g Perform orthogonal transformations separately. Based on the transformation results, the actual output voltage on the load side of the six-switch single-phase converter can be simplified under orthogonal transformation as follows:

[0061]

[0062] Among them, u oαβ The actual output voltage on the load side of the converter in the previous sampling period is i, which is also the actual output voltage of the converter in the previous sampling period. oαβ L represents the actual output current on the load side of the converter in the previous sampling period, which is also the actual output current of the converter in the previous sampling period. o For the load-side inductance, R o This is the load-side voltage.

[0063] After a delayed Euler transformation, formula (3) can be used to further calculate the converter output current for the current sampling period:

[0064]

[0065] Among them, i oαβ (k+1) represents the converter output current during the current sampling period, u oαβ (k+1) represents the converter output voltage during the current sampling period, i oαβ (k) represents the actual output current of the converter in the previous sampling period, and Ts represents the sampling period.

[0066] Step S103: Select the optimal solution of the power combination and the converter output current of the current sampling period using a pre-established cost function, wherein the cost function is a linear combination of the power prediction cost function and the current prediction cost function.

[0067] The pre-established cost function is a linear combination of the power prediction cost function and the current prediction cost function, and is as follows:

[0068]

[0069] The minimum value of J under multiple sets of parameters is calculated using formula (5). This minimum value is the optimal solution for the active power, reactive power, and converter output current of the current sampling period. The meaning of formula (5) and the multiple power combinations are introduced below.

[0070] Step S104: Use the optimal solution to determine the switching state combination of the converter in the current sampling period, and control the converter.

[0071] Based on the obtained optimal solution, that is, the optimal voltage vector, the switching state combination of the converter in the current sampling period is selected, and the switching state combination of the converter in the current sampling period is determined as the working state of the current period in order to achieve the target power and target current, etc.

[0072] In this embodiment, the input voltage and current of the previous sampling period are detected and acquired, multiple power combinations of the previous sampling period are calculated, and then multiple power combinations of the current sampling period are predicted, and multiple converter output currents of the current sampling period are calculated. The optimal solution for the power combination and converter output current of the current sampling period is selected using a pre-established cost function, and the switching state combination of the converter in the current sampling period is determined using the optimal solution, thereby controlling the converter. This embodiment does not employ a traditional dual-closed-loop control system; instead, it uses power and current prediction to predict the power combination and converter output current of the current sampling period, and establishes a cost function based on the prediction results to solve for the optimal voltage vector, controlling the switching state combination of the six-switch single-phase converter. Using power and current prediction to determine the switching state combination not only reduces the computational load of the system but also improves the system's stability and accelerates its dynamic response capability.

[0073] As an optional implementation, in this embodiment of the invention, the step of predicting multiple power combinations for the current sampling period using multiple power combinations calculated in the previous sampling period includes:

[0074] Step S201: Obtain the actual input voltage on the grid side, the actual input current on the grid side, the actual active power on the grid side, the actual reactive power on the grid side, and the converter input voltage of the previous sampling period;

[0075] Step S202: Perform orthogonal transformations on the actual input voltage of the grid side, the actual input current of the grid side, and the input voltage of the converter to obtain the transformed vectors of the actual input voltage of the grid side, the actual input current of the grid side, and the input voltage of the converter.

[0076] Specifically, the actual input voltage v on the grid side in the previous sampling period is detected and acquired. g Actual input current i on the grid side g The input voltage of the converter is u g ,

[0077] The actual input voltage v on the grid side g The actual input current i on the grid side g Converter input voltage u g Perform orthogonal transformations respectively. The transformed actual input voltage v on the grid side g The actual input voltage vector v on the grid side gα With v gβ That is, v gα v gβ Both are the actual input voltage vectors from the grid side as described in the previous sampling period. Further, v gα v gβ The vector sum is v gαβ In this embodiment, v gαβ This is also the actual input voltage vector of the grid side mentioned in the previous sampling period. Similarly, the transformed actual input current i of the grid side... g The actual input current vector i on the grid side gα with i gβ That is to say, i gα i gβ All are the actual input voltage vectors on the grid side as described in the previous sampling period. Further, i gα i gβ The vector sum is i gαβ In this embodiment, i gαβ This is also the actual input current vector from the grid side mentioned in the previous sampling period. Similarly, the transformed converter input voltage u g The converter input voltage vector u in the previous sampling period gα with u gβ That is to say, u gα u gβ All are the converter input voltage vectors of the previous sampling period. Further, i gα i gβ The vector sum is i gαβ In this embodiment, i gαβ It is also the actual input current vector on the grid side mentioned in the previous sampling period.

[0078] The active and reactive power obtained directly by detection are referred to as the actual active power and actual reactive power of the grid side. The active and reactive power calculated after orthogonal transformation of the actual input voltage and actual input current of the grid side in the previous sampling period are also referred to as the actual active power and actual reactive power of the grid side.

[0079] Step S203: Calculate a power combination for the current sampling period based on the actual input voltage vector of the grid side, the input voltage vector of the converter, the actual active power of the grid side and the actual reactive power of the grid side in the previous sampling period.

[0080] Based on the actual input voltage vector v on the power grid side gα v gβ and the converter input voltage vector u gα u gβ The actual active power P and actual reactive power Q of the grid side in the previous sampling period are calculated, which is to predict a set of power combinations for the current sampling period.

[0081] In this embodiment, the detected actual input voltage, actual input current, and converter input voltage on the grid side are orthogonally transformed in the αβ coordinate system through orthogonal transformation, and the voltage and current are vectorized. The power combination of the current sampling period is calculated based on the transformation result.

[0082] As an optional implementation, in this embodiment of the invention, the power combination of the current sampling period is predicted using the following formula:

[0083]

[0084]

[0085] Wherein, P(k+1) is the predicted active power of the grid side in the current sampling period, Q(k+1) is the predicted reactive power of the grid side in the current sampling period, P(k) is the actual active power of the grid side in the previous sampling period, and Q(k) is the actual reactive power of the grid side in the previous sampling period, v gα (k), v gβ (k) are all the actual input voltage vectors of the power grid side in the previous sampling period, i gα (k), i gβ (k) represents the actual input current vector of the power grid side in the previous sampling period, u gα (k), u gβ (k) are all the converter input voltage vectors of the previous sampling period, Lg R is the grid-side inductance. g Let ω be the grid-side resistance. g is a constant, and Ts is the sampling period.

[0086] Furthermore, the converter input voltage vector u in the previous sampling period gα (k), u gβ (k) has a significant impact on the switching state of the six-switch single-phase converter, when the converter input voltage vector u in the previous sampling period... gα (k), u gβ When (k) changes, the grid-side predicted active power P(k+1) in the current sampling period and the grid-side predicted reactive power Q(k+1) in the current sampling period also change accordingly, that is, multiple power combinations and multiple converter output currents are generated.

[0087] In this embodiment of the invention, (k) represents the previous sampling period, and (k+1) represents the current sampling period.

[0088] In this embodiment, the traditional dual closed-loop control system can be replaced by the MPC control model. By changing the converter input voltage vector, multiple power combinations and multiple converter output currents in the current sampling period can be obtained.

[0089] As an optional implementation, in this embodiment of the invention, the output currents of multiple converters in the current sampling period are calculated using the following formula:

[0090]

[0091] Among them, i oαβ (k+1) represents the converter output current during the current sampling period, u oαβ (k+1) represents the converter output voltage during the current sampling period, i oαβ (k) represents the actual output current L of the converter in the previous sampling period. o R is the load-side inductance. o The load-side resistance is denoted as .

[0092] As an optional implementation, in this embodiment of the invention, the actual output voltage of the converter satisfies the following relationship function:

[0093]

[0094] Among them, u oαβ i is the actual output voltage of the converter in the previous sampling period. oαβ The actual output current of the converter in the previous sampling period is given.

[0095] As an optional implementation, in this embodiment of the invention, the pre-established cost function is:

[0096]

[0097] Among them, P * For reference active power, Q * Reference reactive power, All are the target output current of the converter, i oα (k+1), i oβ (k+1) represents the converter output current during the current sampling period, and J is a variable.

[0098] Specifically, referring to the active power P * In this embodiment, the actual active power P on the grid side and the reference reactive power Q are used. * In this embodiment, Q is the actual reactive power on the grid side, P(k+1) is the predicted active power on the grid side in the current sampling period, and Q(k+1) is the predicted reactive power on the grid side in the current sampling period. All of these are the target output current of the converter, that is, the desired output current on the load side of the converter. oα (k+1), i oβ (k+1) represents the converter output current during the current sampling period. In this embodiment, i oα (k+1), i oβ The vector sum of (k+1) is i oαβ (k+1), therefore i oα (k+1), i oβ (k+1), i oαβ (k+1) are all referred to as the converter output current in the current sampling period.

[0099] The actual active power P on the grid side, the actual reactive power Q on the grid side, and the target output current of the converter are used. The four sets of actual known values, the grid-side predicted active power P(k+1), the grid-side predicted reactive power Q(k+1), and the converter output current i in the current sampling period. oα (k+1), i oβ The sum of the differences between the four sets of predicted values ​​(k+1) constitutes the cost function, which is a linear combination of the power prediction cost function and the current prediction cost function. The minimum value J is found, which is the voltage vector of the minimum cost function; this voltage vector is the optimal solution. Using this optimal solution, the switching state combination of the converter in the current sampling period is determined, and the converter is controlled.

[0100] Example 2

[0101] This embodiment provides a six-switch single-phase converter control device. This device can be used to execute the six-switch single-phase converter control method in Embodiment 1 above. This device can be installed inside a server or other equipment, with modules cooperating with each other to achieve control of the six-switch single-phase converter. Figure 4 As shown, the device includes:

[0102] The prediction module 201 is used to predict multiple power combinations for the current sampling period using multiple power combinations calculated in the previous sampling period, wherein each power combination includes an active power and a corresponding reactive power.

[0103] Calculation module 202 is used to calculate the output current of multiple converters in the current sampling period;

[0104] The solution module 203 is used to select the optimal solution of the power combination and the converter output current of the current sampling period using a pre-established cost function, wherein the cost function is a linear combination of the power prediction cost function and the current prediction cost function.

[0105] The determining module 204 is used to determine the switching state combination of the converter in the current sampling period using the optimal solution, and to control the converter.

[0106] As an optional implementation, in this embodiment of the invention, the prediction module further includes:

[0107] The acquisition module is used to acquire the actual input voltage on the grid side, the actual input current on the grid side, the actual active power on the grid side, the actual reactive power on the grid side, and the converter input voltage of the previous sampling period;

[0108] The transformation module is used to perform orthogonal transformations on the actual input voltage, actual input current, and converter input voltage of the grid side to obtain the transformed vectors of the actual input voltage, actual input current, and converter input voltage.

[0109] The combination module is used to calculate a power combination for the current sampling period based on the actual input voltage vector of the grid side, the input voltage vector of the converter, and the actual active power and reactive power of the grid side in the previous sampling period.

[0110] In this embodiment of the invention, the input voltage and current of the previous sampling period are detected and acquired. Multiple power combinations of the previous sampling period are calculated, and then multiple power combinations of the current sampling period are predicted, along with the multiple converter output currents of the current sampling period. An optimal solution for the power combination and converter output current of the current sampling period is selected using a pre-established cost function. The optimal solution is then used to determine the switching state combination of the converter in the current sampling period, thereby controlling the converter. This embodiment does not employ a traditional dual-closed-loop control system; instead, it uses an MPC model predictive control method. This involves predicting power and current, forecasting the power combination and converter output current of the current sampling period, and establishing a cost function based on the prediction results to solve for the optimal voltage vector, thereby controlling the switching state combination of the six-switch single-phase converter. Determining the switching state combination using power and current predictions not only reduces the computational load but also improves system stability and accelerates dynamic response.

[0111] For a detailed description of the aforementioned device, please refer to the above method embodiments, which will not be repeated here.

[0112] Example 3

[0113] This embodiment provides an electronic device, such as... Figure 5 As shown, the electronic device includes a processor 301 and a memory 302, wherein the processor 301 and the memory 302 can be connected via a bus or other means. Figure 5 Taking the example of a connection between China and Israel via a bus.

[0114] Processor 301 can be a Central Processing Unit (CPU). Processor 301 can also be other general-purpose processors, digital signal processors (DSPs), graphics processing units (GPUs), embedded neural network processing units (NPUs), or other dedicated deep learning coprocessors, application-specific integrated circuits (ASICs), field-programmable gate arrays (FPGAs), or other programmable logic devices, discrete gate or transistor logic devices, discrete hardware components, or combinations of the above types of chips.

[0115] The memory 302, as a non-transitory computer-readable storage medium, can be used to store non-transitory software programs, non-transitory computer-executable programs, and modules, such as the program instructions / modules corresponding to the six-switch single-phase converter control method in this embodiment of the invention. The processor 301 executes various processor functions and data processing by running the non-transitory software programs, instructions, and modules stored in the memory 302, thereby implementing the six-switch single-phase converter control method in the above embodiment.

[0116] The memory 302 may further include a program storage area and a data storage area, wherein the program storage area may store the operating system and applications required for at least one function; the data storage area may store data created by the processor 301, etc. Furthermore, the memory 302 may include high-speed random access memory and non-transitory memory, such as at least one disk storage device, flash memory device, or other non-transitory solid-state storage device. In some embodiments, the memory 302 may optionally include memory remotely located relative to the processor 301, and these remote memories may be connected to the processor 301 via a network. Embodiments of the aforementioned network include, but are not limited to, the Internet, corporate intranets, local area networks, mobile communication networks, and combinations thereof.

[0117] The memory 302 stores one or more modules, which, when executed by the processor 301, perform actions such as... Figure 2 The six-switch single-phase converter control method in the illustrated embodiment.

[0118] For specific details regarding the aforementioned electronic devices, please refer to the relevant documentation. Figure 2 The relevant descriptions and effects in the illustrated embodiments are for understanding purposes only and will not be repeated here.

[0119] This invention also provides a computer-readable storage medium storing computer-executable instructions that can execute the six-switch single-phase converter control method in any of the above embodiments. The storage medium can be a magnetic disk, optical disk, read-only memory (ROM), random access memory (RAM), flash memory, hard disk drive (HDD), or solid-state drive (SSD), etc.; the storage medium may also include combinations of the above types of memory.

[0120] Obviously, the above embodiments are merely illustrative examples for clear explanation and are not intended to limit the implementation. Those skilled in the art will recognize that other variations or modifications can be made based on the above description. It is neither necessary nor possible to exhaustively list all possible implementations here. However, obvious variations or modifications derived therefrom are still within the scope of protection of this invention.

Claims

1. A control method for a six-switch single-phase converter, characterized in that, Includes the following steps: Using the multiple power combinations calculated in the previous sampling period, multiple power combinations for the current sampling period are predicted. Each power combination includes an active power and a corresponding reactive power. Calculate the output current of multiple converters in the current sampling period; The optimal solution for the power combination and the converter output current of the current sampling period is selected using a pre-established cost function, wherein the cost function is a linear combination of the power prediction cost function and the current prediction cost function. The optimal solution is used to determine the switching state combination of the converter in the current sampling period, and the converter is controlled accordingly.

2. The control method for a six-switch single-phase converter according to claim 1, characterized in that, The method of predicting multiple power combinations for the current sampling period using multiple power combinations calculated in the previous sampling period includes: Obtain the actual input voltage, actual input current, actual active power, actual reactive power, and converter input voltage of the grid side in the previous sampling period; Orthogonal transformations are performed on the actual input voltage on the grid side, the actual input current on the grid side, and the input voltage of the converter, respectively, to obtain the transformed vectors of the actual input voltage on the grid side, the actual input current on the grid side, and the input voltage of the converter. A power combination for the current sampling period is calculated based on the actual input voltage vector of the grid side, the input voltage vector of the converter, and the actual active power and reactive power of the grid side in the previous sampling period.

3. The control method for a six-switch single-phase converter according to claim 2, characterized in that, The power combination for the current sampling period can be predicted using the following formula: Wherein, P(k+1) is the predicted active power of the grid side in the current sampling period, Q(k+1) is the predicted reactive power of the grid side in the current sampling period, P(k) is the actual active power of the grid side in the previous sampling period, and Q(k) is the actual reactive power of the grid side in the previous sampling period, v gα (k), v gβ (k) represents the actual input voltage vector of the power grid side in the previous sampling period, u gα (k), u gβ (k) are all the converter input voltage vectors of the previous sampling period, L g R is the grid-side inductance. g Let ω be the grid-side resistance. g is a constant, and Ts is the sampling period.

4. The control method for a six-switch single-phase converter according to claim 3, characterized in that, The output current of multiple converters in the current sampling period can be calculated using the following formula: Among them, i oαβ (k+1) represents the converter output current during the current sampling period, u oαβ (k+1) represents the converter output voltage during the current sampling period, i oαβ (k) represents the actual output current of the converter in the previous sampling period, L o R is the load-side inductance. o This is the load-side resistance.

5. The control method for a six-switch single-phase converter according to claim 4, characterized in that, The actual output voltage of the converter satisfies the following relationship function: Among them, u oαβ i is the actual output voltage of the converter in the previous sampling period. oαβ The actual output current of the converter in the previous sampling period is given.

6. The control method for a six-switch single-phase converter according to claim 5, characterized in that, The pre-established cost function is: Among them, P * For reference active power, Q * Reference reactive power, Both are the target output current of the converter, i oα (k+1), i oβ (k+1) represents the converter output current during the current sampling period, and J is a variable.

7. A six-switch single-phase converter control device, characterized in that, include: The prediction module is used to predict multiple power combinations for the current sampling period using multiple power combinations calculated in the previous sampling period. Each power combination includes an active power and a corresponding reactive power. The calculation module is used to calculate the output current of multiple converters in the current sampling period; The solution module is used to select the optimal solution of the power combination and the converter output current of the current sampling period using a pre-established cost function, wherein the cost function is a linear combination of the power prediction cost function and the current prediction cost function. The determination module is used to determine the switching state combination of the converter in the current sampling period using the optimal solution, and to control the converter.

8. The apparatus according to claim 7, characterized in that, The prediction module also includes: The acquisition module is used to acquire the actual input voltage, actual input current, actual active power, actual reactive power, and converter input voltage of the grid side in the previous sampling period. The transformation module is used to perform orthogonal transformations on the actual input voltage, actual input current, and converter input voltage of the grid side to obtain the transformed actual input voltage vector, actual input current vector, and converter input voltage vector of the grid side. The combination module is used to calculate a power combination for the current sampling period based on the actual input voltage vector of the grid side, the input voltage vector of the converter, and the actual active power and reactive power of the grid side in the previous sampling period.

9. An electronic device, characterized in that, include: The device includes a memory and a processor, which are interconnected. The memory stores computer instructions, and the processor executes the computer instructions to perform the six-switch single-phase converter control method according to any one of claims 1-6.

10. A computer-readable storage medium, characterized in that, The computer-readable storage medium stores computer instructions for causing the computer to execute the six-switch single-phase converter control method according to any one of claims 1-6.

Images