Efficient single-stage bidirectional AC-DC converter current construction method and related device

Abstract

The invention discloses a high-efficiency single-stage bidirectional AC-DC converter current construction method and a related device, and the method comprises the steps: firstly collecting the input voltage and input current of the AC side of a single-stage bidirectional AC-DC converter; the collected voltage signals and current signals are converted into voltage components and current components under a # imgabs0 # coordinate system and a dq coordinate system respectively, instantaneous power relational expressions under the corresponding coordinate systems are determined according to the voltage components and the current components under the corresponding coordinate systems, and then the instantaneous power relational expressions under the two coordinate systems are combined, so that the instantaneous power is obtained. According to the technical scheme, the quadrature current relation equation is constructed, the current value of beta-axis quadrature current is calculated through the quadrature current relation equation, and the # imgabs 1 # axis current component # imgabs 2 # can be rapidly constructed on the premise of not depending on the inductance value of an LC filter at the input end of the network side. The influence caused by errors of inductance values of the LC filter due to aging of circuit devices can be avoided, and the technical problem that the construction accuracy of the orthogonal current component of the # imgabs3 axis is low is solved.

Description

Technical Field

[0001] The present application relates to the technical field of converters, and in particular to a current construction method and related devices for a high-efficiency single-stage bidirectional AC-DC converter. Background Art

[0002] The single-stage bidirectional AC-DC converter has the characteristics of bidirectional power transmission, high power density, controllable AC side power factor, and electrical isolation. The bidirectional single-stage isolated AC-DC matrix converter topology currently used in bidirectional charging devices is as follows: Figure 1 shown.

[0003] The commonly used control methods for bidirectional single-stage isolated AC-DC matrix converters are: one is to use a PR (Proportional resonance) controller to directly control the grid current in a stationary reference coordinate system. The PR controller has a simple structure and is easy to implement. It can achieve zero-error tracking of the AC given signal, but the controller is sensitive to grid voltage frequency disturbances; the other is to transform the coordinates of the sinusoidal current and use a PI (Proportional integral) controller to control it in a synchronous reference coordinate system. In a synchronous dq coordinate system, the PI-based regulation method can not only achieve independent control of active current and reactive current, but also achieve zero-error control of the input current.

[0004] Since the PI controller is used to implement the single-stage bidirectional AC-DC converter, Shaft current component The structural efficiency and accuracy of the converter play a key role in the overall control effect. In actual use, the circuit components in the converter will age as the use time increases. However, the existing Axis quadrature current component The construction algorithm is overly dependent on circuit parameters, which leads to the existing single-stage bidirectional AC-DC converter control technology having The technical problem of low construction accuracy of axis orthogonal current components. Summary of the invention

[0005] The present application provides a high-efficiency single-stage bidirectional AC-DC converter current construction method and related devices, which are used to solve the existing single-stage bidirectional AC-DC converter control technology. A technical problem of low construction accuracy of axis orthogonal current components.

[0006] In order to solve the above technical problems, the first aspect of the present application provides a high-efficiency single-stage bidirectional AC-DC converter current construction method, which is applied to a single-stage bidirectional AC-DC converter. The single-stage bidirectional AC-DC converter includes: an LC filter circuit, a matrix conversion circuit, a high-frequency transformer, an LCL resonant circuit, an H-bridge circuit and an output filter circuit. The current construction method includes:

[0007] Based on the single-stage bidirectional AC-DC converter, acquiring an AC side input voltage and an AC side input current of the single-stage bidirectional AC-DC converter;

[0008] By means of coordinate system conversion processing, the AC side input voltage and the AC side input current are respectively converted into A first voltage component and a first current component in a coordinate system, and a second voltage component and a second current component in a dq coordinate system;

[0009] Determine based on the first voltage component and the first current component The first instantaneous power relation in the coordinate system;

[0010] Determine a second instantaneous power relationship in a dq coordinate system according to the second voltage component and the second current component;

[0011] An orthogonal current relationship equation is constructed according to the first instantaneous power relationship equation and the second instantaneous power relationship equation, so as to calculate the current value of the β-axis orthogonal current through the orthogonal current relationship equation.

[0012] Preferably, the orthogonal current relationship equation is specifically:

[0013]

[0014] In the formula, is the β-axis orthogonal current, is the d-axis voltage component of the AC side input voltage in the dq coordinate system, is the d-axis current component of the AC input current in the dq coordinate system, The input voltage of the AC side is The β-axis voltage component in the coordinate system, is the q-axis voltage component of the AC side input voltage in the dq coordinate system, is the q-axis current component of the AC input current in the dq coordinate system, The input voltage of the AC side is The α-axis voltage component in the coordinate system.

[0015] Preferably, the first instantaneous power relationship is specifically:

[0016]

[0017] In the formula, The input voltage of the AC side is The α-axis voltage component in the coordinate system, The input voltage of the AC side is The β-axis voltage component in the coordinate system, is the β-axis orthogonal current, The input current of the AC side is The α-axis current component in the coordinate system, P1 is The instantaneous active power in the coordinate system, Q1 is Instantaneous reactive power in the coordinate system.

[0018] Preferably, the second instantaneous power relationship is specifically:

[0019]

[0020] In the formula, is the d-axis voltage component of the AC side input voltage in the dq coordinate system, is the d-axis current component of the AC input current in the dq coordinate system, is the q-axis voltage component of the AC side input voltage in the dq coordinate system, is the q-axis current component of the AC side input current in the dq coordinate system, P2 is the instantaneous active power in the dq coordinate system, and Q2 is the instantaneous reactive power in the dq coordinate system.

[0021] At the same time, the second aspect of the present application provides a high-efficiency single-stage bidirectional AC-DC converter current construction device, which is applied to a single-stage bidirectional AC-DC converter. The single-stage bidirectional AC-DC converter includes: an LC filter circuit, a matrix conversion circuit, a high-frequency transformer, an LCL resonant circuit, an H-bridge circuit and an output filter circuit. The current construction device includes:

[0022] An electrical signal acquisition unit, configured to acquire an AC side input voltage and an AC side input current of the single-stage bidirectional AC-DC converter based on the single-stage bidirectional AC-DC converter;

[0023] The electrical signal component conversion unit is used to convert the AC side input voltage and the AC side input current into A first voltage component and a first current component in a coordinate system, and a second voltage component and a second current component in a dq coordinate system;

[0024] a first power relationship determining unit, configured to determine, according to the first voltage component and the first current component, The first instantaneous power relation in the coordinate system;

[0025] a second power relationship determining unit, configured to determine a second instantaneous power relationship equation in a dq coordinate system according to the second voltage component and the second current component;

[0026] The orthogonal current determination unit is used to construct an orthogonal current relationship equation according to the first instantaneous power relationship equation and the second instantaneous power relationship equation, so as to calculate the current value of the β-axis orthogonal current through the orthogonal current relationship equation.

[0027] Preferably, the orthogonal current relationship equation is specifically:

[0028]

[0029] In the formula, is the β-axis orthogonal current, is the d-axis voltage component of the AC side input voltage in the dq coordinate system, is the d-axis current component of the AC input current in the dq coordinate system, The input voltage of the AC side is The β-axis voltage component in the coordinate system, is the q-axis voltage component of the AC side input voltage in the dq coordinate system, is the q-axis current component of the AC input current in the dq coordinate system, The input voltage of the AC side is The α-axis voltage component in the coordinate system.

[0030] Preferably, the first instantaneous power relationship is specifically:

[0031]

[0032] In the formula, The input voltage of the AC side is The α-axis voltage component in the coordinate system, The input voltage of the AC side is The β-axis voltage component in the coordinate system, is the β-axis orthogonal current, The input current of the AC side is The α-axis current component in the coordinate system, P1 is The instantaneous active power in the coordinate system, Q1 is Instantaneous reactive power in the coordinate system.

[0033] Preferably, the second instantaneous power relationship is specifically:

[0034]

[0035] In the formula, is the d-axis voltage component of the AC side input voltage in the dq coordinate system, is the d-axis current component of the AC input current in the dq coordinate system, is the q-axis voltage component of the AC side input voltage in the dq coordinate system, is the q-axis current component of the AC side input current in the dq coordinate system, P2 is the instantaneous active power in the dq coordinate system, and Q2 is the instantaneous reactive power in the dq coordinate system.

[0036] A third aspect of the present application provides a high-efficiency single-stage bidirectional AC-DC converter current construction terminal, comprising: a memory and a processor;

[0037] The memory is used to store program codes, and the program codes are used to implement a high-efficiency single-stage bidirectional AC-DC converter current construction method as provided in the first aspect of the present application;

[0038] The processor is used for reading and executing the program code.

[0039] The fourth aspect of the present application provides a computer-readable storage medium, which stores a program code, and the program code is used to be read and executed by a processor to implement a high-efficiency single-stage bidirectional AC-DC converter current construction method as provided in the first aspect of the present application.

[0040] It can be seen from the above technical solutions that this application has the following advantages:

[0041] The method provided in the present application first collects the input voltage and input current of the AC side of the single-stage bidirectional AC-DC converter, and then converts the collected voltage signal and current signal into The voltage components and current components in the coordinate system and the dq coordinate system are determined, and the instantaneous power relationship in the corresponding coordinate system is determined according to the voltage components and current components in the corresponding coordinate system. Then, the orthogonal current relationship equation is constructed by combining the instantaneous power relationship equations in the two coordinate systems, so as to calculate the current value of the β-axis orthogonal current through the orthogonal current relationship equation. The solution provided by the present application can quickly construct the LC filter inductance value without relying on the grid-side input end. Shaft current component , which can avoid the error caused by aging of circuit components such as LC filter inductance value, and solve the existing single-stage bidirectional AC-DC converter control technology A technical problem of low construction accuracy of axis orthogonal current components. BRIEF DESCRIPTION OF THE DRAWINGS

[0042] In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative labor.

[0043] Figure 1 This is a circuit topology diagram of a single-phase single-stage LCL type bidirectional AC-DC converter.

[0044] Figure 2 A schematic flow chart of an embodiment of a high-efficiency single-stage bidirectional AC-DC converter current construction method provided in the present application.

[0045] Figure 3 This is a control logic block diagram of a single-phase single-stage LCL type bidirectional AC-DC converter provided in this application.

[0046] FIG4 (a) is a grid-side voltage and grid-side current waveform diagram of a single-phase single-stage LCL type bidirectional AC-DC converter under a first current condition based on a high-efficiency single-stage bidirectional AC-DC converter current construction method provided by the present application.

[0047] FIG4( b ) is a grid-side voltage and grid-side current waveform diagram of a single-phase single-stage LCL type bidirectional AC-DC converter under a second current condition based on a high-efficiency single-stage bidirectional AC-DC converter current construction method provided by the present application.

[0048] FIG4( c ) is a grid-side voltage and grid-side current waveform diagram of a single-phase single-stage LCL type bidirectional AC-DC converter under a third current condition based on a high-efficiency single-stage bidirectional AC-DC converter current construction method provided by the present application.

[0049] Figure 5 Based on the current construction method of a high-efficiency single-stage bidirectional AC-DC converter provided by this application and the existing algorithm Comparison of the effects of axis-orthogonal current components.

[0050] Figure 6 A schematic structural diagram of an embodiment of a high-efficiency single-stage bidirectional AC-DC converter current construction device provided in the present application.

[0051] Figure 7 A schematic structural diagram of an embodiment of a high-efficiency single-stage bidirectional AC-DC converter current construction terminal provided in the present application. DETAILED DESCRIPTION

[0052] In the actual use of a single-stage bidirectional AC-DC converter, the circuit components in the converter will age as the use time increases. Especially in high-power applications, the working current of the bidirectional AC-DC converter is often relatively large. When the working current of the inductor increases, the magnetic core will be DC biased, resulting in a large distortion of the input side inductance value, which further increases the error between the actual inductance value and the inductance value used by the algorithm. Axis quadrature current component The construction algorithm is as follows:

[0053]

[0054] In the formula, is the β-axis orthogonal current, is the β-axis component of the input voltage, is the β-axis component of the filter capacitor voltage, is the equivalent inductance of the equivalent circuit, is the Laplace operator.

[0055] This Axis quadrature current component The construction algorithm is overly dependent on the parameters of the inductor components, resulting in the existing single-stage bidirectional AC-DC converter control technology having A technical problem of low construction accuracy of axis orthogonal current components.

[0056] The present invention provides a method and a related device for constructing a current of an efficient single-stage bidirectional AC-DC converter, which is used to solve the problems existing in the control technology of the existing single-stage bidirectional AC-DC converter. A technical problem of low construction accuracy of axis orthogonal current components.

[0057] In order to make the purpose, features, and advantages of the invention of this application more obvious and easy to understand, the technical solutions in the embodiments of this application will be clearly and completely described below in conjunction with the drawings in the embodiments of this application. Obviously, the embodiments described below are only part of the embodiments of this application, not all of them. Based on the embodiments in this application, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of this application.

[0058] The present application provides a high-efficiency single-stage bidirectional AC-DC converter current construction method, which is specifically applied to a single-stage bidirectional AC-DC converter. The structure of the single-stage bidirectional AC-DC converter is as follows: Figure 1 As shown, it includes: LC filter circuit, matrix conversion circuit, high frequency transformer, LCL resonant circuit, H bridge circuit and output filter circuit. Figure 1 As shown, is an AC voltage source, is a DC voltage source, and the output voltage of the matrix converter is , the DC side full-bridge converter output voltage is recorded as . Let the switching frequencies of the switches on both sides be the same, recorded as , the corresponding switching period is recorded as The input current on the AC side is , the DC side output current is .

[0059] See also Figure 2 and Figure 3 The high-efficiency single-stage bidirectional AC-DC converter current construction method provided in this embodiment includes:

[0060] Step 101: Based on a single-stage bidirectional AC-DC converter, an AC side input voltage and an AC side input current of the single-stage bidirectional AC-DC converter are obtained;

[0061] Step 102: Convert the AC side input voltage and the AC side input current into A first voltage component and a first current component in a coordinate system, and a second voltage component and a second current component in a dq coordinate system;

[0062] Step 103: Determine based on the first voltage component and the first current component The first instantaneous power relation in the coordinate system;

[0063] Step 104: determining a second instantaneous power relationship in a dq coordinate system according to the second voltage component and the second current component;

[0064] Step 105 : construct an orthogonal current relationship equation according to the first instantaneous power relationship equation and the second instantaneous power relationship equation, so as to calculate the current value of the β-axis orthogonal current through the orthogonal current relationship equation.

[0065] It should be noted that if Figure 3 The control block diagram shown in the figure, the technical solution provided by the present application is based on a single-stage bidirectional AC-DC converter that needs to be controlled to obtain its AC side input voltage And the AC input current , then, based on the AC side input voltage obtained And the AC input current Convert to Coordinate system and voltage and current components in dq coordinate system are used to construct The power relationship equation of the coordinate system and the dq coordinate system, where the first instantaneous power relationship equation is: The instantaneous active power P1 and instantaneous reactive power Q1 in the coordinate system are shown in formula (1).

[0066] (1)

[0067] The second instantaneous power relationship represents the instantaneous active power P2 and the instantaneous reactive power Q2 in the dq coordinate system, as shown in formula (2).

[0068] (2)

[0069] In the formula, The AC input voltage is The α-axis voltage component in the coordinate system, The AC input voltage is The β-axis voltage component in the coordinate system, is the β-axis orthogonal current, The input current of the AC side is The α-axis current component in the coordinate system, P1 is The instantaneous active power in the coordinate system, Q1 is The instantaneous reactive power in the coordinate system, is the d-axis voltage component of the AC side input voltage in the dq coordinate system, is the d-axis current component of the AC input current in the dq coordinate system, is the q-axis voltage component of the AC side input voltage in the dq coordinate system, is the q-axis current component of the AC side input current in the dq coordinate system, P2 is the instantaneous active power in the dq coordinate system, and Q2 is the instantaneous reactive power in the dq coordinate system.

[0070] Next, by combining the above equations (1) and (2), we can get The expression is shown as follows:

[0071] (3)

[0072] When given and When a change occurs, the required value of the entire control loop can be accurately calculated by the evolution formula of formula (3) - formula (4) .

[0073] (4)

[0074] The orthogonal current construction logic provided in this embodiment takes into account the specific circuit structure and operating principle of the single-phase single-stage LCL type bidirectional AC-DC converter. The calculation logic is highly targeted and can give full play to the performance advantages of the single-phase single-stage LCL type bidirectional AC-DC converter. Moreover, through the cross-coordinated electrical parameters of the dual coordinate system, the control accuracy of the D-axis current and the Q-axis current can be improved.

[0075] In order to verify the decoupling control strategy and structure proposed in this application Advantages of the shaft current algorithm. This embodiment builds two simulation models on the Simulink platform of Matlab for comparison. The specific input and output indicators of the simulation model are: input AC voltage is 220V, 50HZ, and output DC voltage is 400V. In the two sets of simulation models, all parameters of the topology used in the control of this embodiment are consistent, and the simulation step size is consistent. Then build a complete closed-loop control model for it. One of the two closed-loop control models is constructed using the second-order generalized integral algorithm. Another set of shaft currents is constructed using the algorithm proposed in this paper The experimental results are shown in Figures 4 and Figure 5 FIG4 (a) shows the d-axis reference current setting in this embodiment. , q-axis reference current The waveform diagram of the grid-side input voltage and grid-side input current obtained under the condition of . From this figure, it can be seen that the power factor angle can be controlled to zero through this application; Figure 4 (b) is a diagram of setting the d-axis reference current in this embodiment , q-axis reference current The waveform diagram of the grid-side input voltage and grid-side input current obtained under the condition of . It can also be seen that the power factor angle can be controlled to ; Figure 4 (c) is a diagram showing the d-axis reference current setting in this embodiment. , q-axis reference current The waveform diagram of the grid-side input voltage and grid-side input current obtained under the condition of . It can also be seen that the power factor angle can be controlled to .exist Figure 5 This embodiment provides the structure proposed in this application. The effect comparison between the shaft current algorithm and the second-order generalized integral (SOGI) algorithm. The second-order generalized integral (SOGI) algorithm needs nearly 60ms to construct an accurate The algorithm proposed in this patent application only takes 10ms to construct an accurate The shaft current, at 0.07s, this embodiment will The shaft current from Switch to In the case of a sudden change in the reference voltage, the algorithm proposed in this application can construct a reference voltage without delay and error. The second-order generalized integral (SOGI) algorithm takes about 30ms to construct an accurate Shaft current.

[0076] The above is a detailed description of an embodiment of a high-efficiency single-stage bidirectional AC-DC converter current construction method provided by the present application. The following is a detailed description of an embodiment of a high-efficiency single-stage bidirectional AC-DC converter current construction device provided by the present application.

[0077] See also Figure 6 The present application provides an embodiment of a high-efficiency single-stage bidirectional AC-DC converter current construction device, which is applied to a single-stage bidirectional AC-DC converter. The single-stage bidirectional AC-DC converter includes: an LC filter circuit, a matrix conversion circuit, a high-frequency transformer, an LCL resonant circuit, an H-bridge circuit and an output filter circuit. The current construction device includes:

[0078] The electrical signal acquisition unit 201 is used to obtain the AC side input voltage and AC side input current of the single-stage bidirectional AC-DC converter based on the single-stage bidirectional AC-DC converter;

[0079] The electrical signal component conversion unit 202 is used to convert the AC side input voltage and the AC side input current into A first voltage component and a first current component in a coordinate system, and a second voltage component and a second current component in a dq coordinate system;

[0080] The first power relationship determining unit 203 is used to determine, according to the first voltage component and the first current component, The first instantaneous power relation in the coordinate system;

[0081] A second power relationship determining unit 204, configured to determine a second instantaneous power relationship in a dq coordinate system according to the second voltage component and the second current component;

[0082] The orthogonal current determination unit 205 is used to construct an orthogonal current relationship equation according to the first instantaneous power relationship equation and the second instantaneous power relationship equation, so as to calculate the current value of the β-axis orthogonal current through the orthogonal current relationship equation.

[0083] More specifically, the orthogonal current relationship equation is:

[0084]

[0085] In the formula, is the β-axis orthogonal current, is the d-axis voltage component of the AC side input voltage in the dq coordinate system, is the d-axis current component of the AC input current in the dq coordinate system, The input voltage of the AC side is The β-axis voltage component in the coordinate system, is the q-axis voltage component of the AC side input voltage in the dq coordinate system, is the q-axis current component of the AC input current in the dq coordinate system, The input voltage of the AC side is The α-axis voltage component in the coordinate system.

[0086] More specifically, the first instantaneous power relationship is:

[0087]

[0088] In the formula, The input voltage of the AC side is The α-axis voltage component in the coordinate system, The input voltage of the AC side is The β-axis voltage component in the coordinate system, is the β-axis orthogonal current, The input current of the AC side is The α-axis current component in the coordinate system, P1 is The instantaneous active power in the coordinate system, Q1 is Instantaneous reactive power in the coordinate system.

[0089] More specifically, the second instantaneous power relationship is:

[0090]

[0091] In the formula, is the d-axis voltage component of the AC side input voltage in the dq coordinate system, is the d-axis current component of the AC input current in the dq coordinate system, is the q-axis voltage component of the AC side input voltage in the dq coordinate system, is the q-axis current component of the AC side input current in the dq coordinate system, P2 is the instantaneous active power in the dq coordinate system, and Q2 is the instantaneous reactive power in the dq coordinate system.

[0092] In addition, the present application also provides a detailed description of an efficient single-stage bidirectional AC-DC converter current construction terminal embodiment and a computer-readable storage medium embodiment related to the above-mentioned efficient single-stage bidirectional AC-DC converter current construction method.

[0093] like Figure 7As shown, the present application also provides an embodiment of a high-efficiency single-stage bidirectional AC-DC converter current construction terminal, the implementation types of the terminal include but are not limited to: personal computers, industrial computers, servers and embedded intelligent devices, the main components of the terminal include: a memory 33 and a processor 31, the memory 33 and the processor 31 can be connected via a communication bus 34;

[0094] The memory 33 is used to store program codes, and the program codes are used to implement a high-efficiency single-stage bidirectional AC-DC converter current construction method as mentioned in the above embodiment;

[0095] The processor 31 is used to read and execute program codes.

[0096] The present application provides a computer-readable storage medium, which stores program code, and the program code is used to be read and executed by a processor to implement a high-efficiency single-stage bidirectional AC-DC converter current construction method as mentioned in the above embodiment.

[0097] Those skilled in the art can clearly understand that, for the convenience and brevity of description, the specific working processes of the terminals, devices and units described above can refer to the corresponding processes in the aforementioned method embodiments and will not be repeated here.

[0098] In the several embodiments provided in the present application, it should be understood that the disclosed terminals, devices and methods 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 an indirect coupling or communication connection through some interfaces, devices or units, which can be electrical, mechanical or other forms.

[0099] The terms "first", "second", "third", "fourth", etc. (if any) in the specification of the present application and the above-mentioned drawings are used to distinguish similar objects, and are not necessarily used to describe a specific order or sequence. It should be understood that the data used in this way can be interchanged where appropriate, so that the embodiments of the present application described herein can, for example, be implemented in an order other than those illustrated or described herein. In addition, the terms "including" and "having" and any of their variations are intended to cover non-exclusive inclusions, for example, a process, method, system, product or device that includes a series of steps or units is not necessarily limited to those steps or units that are clearly listed, but may include other steps or units that are not clearly listed or inherent to these processes, methods, products or devices.

[0100] It should be understood that in the present application, "at least one (item)" means one or more, and "plurality" means two or more. "And / or" is used to describe the association relationship of associated objects, indicating that three relationships may exist. For example, "A and / or B" can mean: only A exists, only B exists, and A and B exist at the same time, where A and B can be singular or plural. The character " / " generally indicates that the objects associated before and after are in an "or" relationship. "At least one of the following" or similar expressions refers to any combination of these items, including any combination of single or plural items. For example, at least one of a, b or c can mean: a, b, c, "a and b", "a and c", "b and c", or "a and b and c", where a, b, c can be single or multiple.

[0101] The units described as separate components may or may not be physically separated, and the components shown as units may or may not be physical units, that is, they may be located in one place or distributed on multiple network units. Some or all of the units may be selected according to actual needs to achieve the purpose of the solution of this embodiment.

[0102] In addition, each functional unit in each embodiment of the present application may be integrated into one processing unit, or each unit may exist physically 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 software functional units.

[0103] If the integrated unit is implemented in the form of a software functional unit and sold or used as an independent product, it can be stored in a computer-readable storage medium. Based on this understanding, the technical solution of the present application is essentially or the part that contributes to the prior art or all or part of the technical solution can be embodied in the form of a software product. The computer software product is stored in a storage medium, including several instructions to enable a computer device (which can be a personal computer, server, or network device, etc.) to execute all or part of the steps of the method described in each embodiment of the present application. The aforementioned storage medium includes: U disk, mobile hard disk, read-only memory (ROM, Read-Only Memory), random access memory (RAM, Random Access Memory), disk or optical disk and other media that can store program code.

[0104] As described above, the above embodiments are only used to illustrate the technical solutions of the present application, rather than to limit them. Although the present application has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or make equivalent replacements for some of the technical features therein. However, these modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the embodiments of the present application.

Claims

1. A high-efficiency single-stage bidirectional AC-DC converter current construction method, applied to a single-stage bidirectional AC-DC converter, the single-stage bidirectional AC-DC converter comprising: LC filter circuit, matrix conversion circuit, high frequency transformer, LCL resonant circuit, H-bridge circuit and output filter circuit, characterized in that the current construction method includes: Based on the single-stage bidirectional AC-DC converter, acquiring an AC side input voltage and an AC side input current of the single-stage bidirectional AC-DC converter; By means of coordinate system conversion processing, the AC side input voltage and the AC side input current are respectively converted into A first voltage component and a first current component in a coordinate system, and a second voltage component and a second current component in a dq coordinate system; Determine based on the first voltage component and the first current component The first instantaneous power relation in the coordinate system; Determine a second instantaneous power relationship in a dq coordinate system according to the second voltage component and the second current component; An orthogonal current relationship equation is constructed according to the first instantaneous power relationship equation and the second instantaneous power relationship equation, so as to calculate the current value of the β-axis orthogonal current through the orthogonal current relationship equation.

2. A high-efficiency single-stage bidirectional AC-DC converter current construction method according to claim 1, characterized in that: The orthogonal current relationship equation is specifically: In the formula, is the β-axis orthogonal current, is the d-axis voltage component of the AC side input voltage in the dq coordinate system, is the d-axis current component of the AC input current in the dq coordinate system, The AC input voltage is The β-axis voltage component in the coordinate system, is the q-axis voltage component of the AC side input voltage in the dq coordinate system, is the q-axis current component of the AC input current in the dq coordinate system, The AC input voltage is The α-axis voltage component in the coordinate system.

3. A high-efficiency single-stage bidirectional AC-DC converter current construction method according to claim 1, characterized in that: The first instantaneous power relationship is specifically: In the formula, The input voltage of the AC side is The α-axis voltage component in the coordinate system, The input voltage of the AC side is The β-axis voltage component in the coordinate system, is the β-axis orthogonal current, The input current of the AC side is The α-axis current component in the coordinate system, P1 is The instantaneous active power in the coordinate system, Q1 is Instantaneous reactive power in the coordinate system.

4. A high-efficiency single-stage bidirectional AC-DC converter current construction method according to claim 1, characterized in that: The second instantaneous power relationship is specifically: In the formula, is the d-axis voltage component of the AC side input voltage in the dq coordinate system, is the d-axis current component of the AC input current in the dq coordinate system, is the q-axis voltage component of the AC side input voltage in the dq coordinate system, is the q-axis current component of the AC side input current in the dq coordinate system, P2 is the instantaneous active power in the dq coordinate system, and Q2 is the instantaneous reactive power in the dq coordinate system.

5. A high-efficiency single-stage bidirectional AC-DC converter current construction device, applied to a single-stage bidirectional AC-DC converter, the single-stage bidirectional AC-DC converter comprising: LC filter circuit, matrix conversion circuit, high frequency transformer, LCL resonant circuit, H bridge circuit and output filter circuit, characterized in that the current construction device includes: An electrical signal acquisition unit, configured to acquire an AC side input voltage and an AC side input current of the single-stage bidirectional AC-DC converter based on the single-stage bidirectional AC-DC converter; The electrical signal component conversion unit is used to convert the AC side input voltage and the AC side input current into A first voltage component and a first current component in a coordinate system, and a second voltage component and a second current component in a dq coordinate system; a first power relationship determining unit, configured to determine, according to the first voltage component and the first current component, The first instantaneous power relation in the coordinate system; a second power relationship determining unit, configured to determine a second instantaneous power relationship equation in a dq coordinate system according to the second voltage component and the second current component; The orthogonal current determination unit is used to construct an orthogonal current relationship equation according to the first instantaneous power relationship equation and the second instantaneous power relationship equation, so as to calculate the current value of the β-axis orthogonal current through the orthogonal current relationship equation.

6. A high-efficiency single-stage bidirectional AC-DC converter current construction device according to claim 5, characterized in that: The orthogonal current relationship equation is specifically: In the formula, is the β-axis orthogonal current, is the d-axis voltage component of the AC side input voltage in the dq coordinate system, is the d-axis current component of the AC input current in the dq coordinate system, The AC input voltage is The β-axis voltage component in the coordinate system, is the q-axis voltage component of the AC side input voltage in the dq coordinate system, is the q-axis current component of the AC input current in the dq coordinate system, The AC input voltage is The α-axis voltage component in the coordinate system.

7. A high-efficiency single-stage bidirectional AC-DC converter current construction device according to claim 5, characterized in that: The first instantaneous power relationship is specifically: In the formula, The input voltage of the AC side is The α-axis voltage component in the coordinate system, The input voltage of the AC side is The β-axis voltage component in the coordinate system, is the β-axis orthogonal current, The input current of the AC side is The α-axis current component in the coordinate system, P1 is The instantaneous active power in the coordinate system, Q1 is Instantaneous reactive power in the coordinate system.

8. The high-efficiency single-stage bidirectional AC-DC converter current construction device according to claim 5, characterized in that: The second instantaneous power relationship is specifically: In the formula, is the d-axis voltage component of the AC side input voltage in the dq coordinate system, is the d-axis current component of the AC input current in the dq coordinate system, is the q-axis voltage component of the AC side input voltage in the dq coordinate system, is the q-axis current component of the AC side input current in the dq coordinate system, P2 is the instantaneous active power in the dq coordinate system, and Q2 is the instantaneous reactive power in the dq coordinate system.

9. A high efficiency single-stage bidirectional AC-DC converter current structure terminal, characterized in that: include: Memory and processor; The memory is used to store program codes, and the program codes are used to implement a high-efficiency single-stage bidirectional AC-DC converter current construction method according to any one of claims 1 to 4; The processor is used for reading and executing the program code.

10. A computer-readable storage medium, characterized in that: The computer-readable storage medium stores program code, and the program code is used to be read and executed by a processor to implement a high-efficiency single-stage bidirectional AC-DC converter current construction method as described in any one of claims 1 to 4.

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