PWM rectifier control method and device, electronic equipment and storage medium

Abstract

The invention provides a control method and device of a PWM rectifier, electronic equipment and a storage medium. The control method comprises the following steps: acquiring a current value and a voltage value of a power grid in a coordinate system; and generating active power and reactive power, generating a cost function, and regulating and controlling the three-phase PWM rectifier based on the cost function. According to the control method, the current of the three-phase PWM rectifier can be controlled.

Description

Technical Field

[0001] The present invention relates to the field of power supply technology, and in particular to a control method, device, electronic equipment and storage medium for a PWM rectifier. Background Art

[0002] In the field of three-phase PWM (Pulse Width Modulation) rectifier control, existing technologies primarily employ two approaches: Model Predictive Control (MPC) and Model-Free Predictive Control (MFPC). MPC establishes an accurate mathematical model of the system, using discretized equations to predict future currents and optimize switching states. This approach offers advantages such as fast dynamic response and flexible control. MPC predicts future currents by measuring historical current changes. Traditional MFPC solutions use a lookup table (LUT) to store current changes corresponding to different voltage vectors, performing predictions through table lookup, thus avoiding parameter dependency.

[0003] The performance of the MPC control method is heavily dependent on system parameters (such as filter inductance and resistors ) accuracy, and significant current prediction errors can occur when there is a parameter mismatch. Traditional MFPCs suffer from the inherent defect of stagnant current change updates. This means that only the current change corresponding to the currently applied voltage vector is updated, while other unused voltage vector data remains unupdated for a long time, resulting in a continuous accumulation of prediction errors. Existing improvement schemes include anti-stagnation algorithms that force switching of unupdated vectors and update methods based on voltage vector combination identification. However, these methods either introduce non-optimal switching states or require complex computing and storage resources, making it difficult to maintain real-time performance while ensuring control accuracy.

[0004] Therefore, designing a control method for a three-phase PWM rectifier has become an urgent problem to be solved. Summary of the Invention

[0005] The object of the present invention is to provide a control method, device, electronic device and storage medium for a PWM rectifier.

[0006] In order to achieve one of the above-mentioned objects, an embodiment of the present invention provides a control method for a PWM rectifier, wherein the PWM rectifier is used for three-phase power, comprising the following steps: obtaining the power grid at The current value and voltage value of the coordinate system in the jth sampling period, the current value The axis component is as well as The axis component is , the voltage value of The axis component is as well as The axis component is ; Where j and k are both natural numbers, j=1, 2, ..., k; Based on 、 ,..., ,as well as 、 ,..., ,as well as 、 ,..., ,as well as 、 ,..., , generating active power and reactive power , is the working power of the k+2th sampling period, is the reactive power in the k+2th sampling period; generating a cost function, and regulating the three-phase PWM rectifier based on the cost function in the k+2th sampling period.

[0007] As a further improvement of an embodiment of the present invention, the three-phase PWM rectifier is provided with a converter , converter and converter , the converter , converter and converter Respectively electrically connected to phase A, phase B and phase C; 、 ,..., ,as well as 、 ,..., ,as well as 、 ,..., ,as well as 、 ,..., , generating active power and reactive power , The power consumption of the k+2th sampling period specifically includes: obtaining the converter In the conduction state of the pth sampling cycle , converter In the conduction state of the pth sampling cycle and converter In the conduction state of the pth sampling cycle ; 、 and The value is 0 or 1, where 0 represents the off state and 1 represents the on state; p is a natural number, p=k-1, k-2, k and k+1; based on 、 and ,generate and ; Based on the formula Generate the instantaneous active power at the k+2th sampling period and reactive power ,in, , , is the line inductance of the three-phase PWM rectifier, is the line resistance of the three-phase PWM rectifier, , ; and, when or hour, , ;when and hour, and are all constants; , ; , , ; , , .

[0008] As a further improvement of an embodiment of the present invention, the cost function ,in, is the reference value of active power, is the reference value of reactive power, and are all constants.

[0009] As a further improvement of one embodiment of the present invention, the 、 and ,generate and Specifically include: ,and ,and hour, , ;when ,and ,and hour, , ;when ,and ,and hour, , ;when ,and ,and hour, , 1. When ,and ,and hour, , ;when ,and ,and hour, , ;when ,and ,and hour, , ;when ,and ,and hour, , .

[0010] The embodiment of the present invention further provides a control device for a PWM rectifier, wherein the PWM rectifier is used for three-phase power, and comprises the following modules: an information acquisition module for acquiring information of a power grid in a The current value and voltage value of the coordinate system in the jth sampling period, the current value The axis component is as well as The axis component is , the voltage value of The axis component is as well as The axis component is ; Wherein, j and k are natural numbers, j = 1, 2, ..., k; The first processing module is used to 、 ,..., ,as well as 、 ,..., ,as well as 、 ,..., ,as well as 、 ,..., , generating active power and reactive power , is the working power of the k+2th sampling period, is the reactive power of the k+2th sampling period; a second processing module is used to generate a cost function and regulate the three-phase PWM rectifier based on the cost function in the k+2th sampling period.

[0011] As a further improvement of an embodiment of the present invention, the three-phase PWM rectifier is provided with a converter , converter and converter , the converter , converter and converter are electrically connected to phase A, phase B and phase C respectively; the first processing module is also used to: obtain the converter In the conduction state of the pth sampling cycle , converter In the conduction state of the pth sampling cycle and converter In the conduction state of the pth sampling cycle ; 、 and The value is 0 or 1, where 0 represents the off state and 1 represents the on state; p is a natural number, p=k-1, k-2, k and k+1; based on 、 and ,generate and ; Based on the formula Generate the instantaneous active power at the k+2th sampling period and reactive power ,in, , , is the line inductance of the three-phase PWM rectifier, is the line resistance of the three-phase PWM rectifier, , ; and, when or hour, , ;when and hour, and are all constants; , ; , , ; , , .

[0012] As a further improvement of an embodiment of the present invention, the cost function ,in, is the reference value of active power, is the reference value of reactive power, and are all constants.

[0013] As a further improvement of an embodiment of the present invention, the first processing module is further configured to: ,and ,and hour, , ;when ,and ,and hour, , ;when ,and ,and hour, , ;when ,and ,and hour, , 1. When ,and ,and hour, , ;when ,and ,and hour, , ;when ,and ,and hour, , ;when ,and ,and hour, , .

[0014] An embodiment of the present invention further provides an electronic device comprising a processor, a memory, and a program or instruction stored in the memory and executable on the processor, wherein the program or instruction, when executed by the processor, implements the steps of the control method described above.

[0015] An embodiment of the present invention further provides a storage medium storing a program or instruction. When the program or instruction is executed by a processor, the steps of the control method described above are implemented.

[0016] Compared with the prior art, the technical effect of the present invention is that: the embodiment of the present invention provides a control method, device, electronic device and storage medium of a PWM rectifier, the control method includes the following steps: obtaining the power grid at The current and voltage values ​​of the coordinate system are calculated; active power and reactive power are generated, a cost function is generated, and the three-phase PWM rectifier is regulated based on the cost function. The control method can control the current of the three-phase PWM rectifier. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 1 is a schematic structural diagram of a three-phase PWM rectifier in an embodiment of the present invention; Figure 2 is a schematic diagram of a LUT in an embodiment of the present invention; Figure 3 yes and Schematic diagram of the estimation algorithm, where x can be α or β; Figure 4 This is a schematic diagram of the control method of the PWM rectifier; Figure 5 It is a flow chart of the control method of the PWM rectifier. DETAILED DESCRIPTION

[0018] The present invention will be described in detail below with reference to the various embodiments shown in the accompanying drawings. However, these embodiments do not limit the present invention, and any structural, methodological, or functional modifications made by those skilled in the art based on these embodiments are all within the scope of protection of the present invention.

[0019] As used herein, terms indicating spatial relative positions, such as "upper," "above," "lower," and "below," are used for ease of explanation to describe the relationship of one element or feature relative to another element or feature as shown in the accompanying drawings. Spatially relative terms may be intended to encompass different orientations of the device in use or operation in addition to the orientation shown in the drawings. For example, if the device in the drawings were turned over, elements described as being "below" or "beneath" other elements or features would then be "above" the other elements or features. Thus, the exemplary term "below" encompasses both above and below. The device may be otherwise oriented (rotated 90 degrees or in other orientations) and the spatially relative descriptors used herein interpreted accordingly.

[0020] A first embodiment of the present invention provides a control method for a PWM rectifier, wherein the PWM rectifier is used for three-phase power, such as Figure 5 As shown, the following steps are included: Step 501: Obtain the power grid The current value and voltage value of the coordinate system in the jth sampling period, the current value The axis component is as well as The axis component is , the voltage value of The axis component is as well as The axis component is ; Wherein, j and k are both natural numbers, j=1, 2, ..., k; The coordinate system is a coordinate system based on the amplitude of the sinusoidal voltage or current. Its two axes are Axis and The axis corresponds to the phase of the sinusoidal voltage or current. There is a certain relationship between the coordinate system and the three-phase stationary coordinate system. The amplitude and phase of the three-phase voltage or current can be converted to The specific conversion formula is as follows: Axis component , the current value Axis component , the voltage value Axis component , the current value Axis component ;in, is the amplitude of the current, is the amplitude of the current, is the phase angle of the current.

[0021] Step 502: Based on 、 ,..., ,as well as 、 ,..., ,as well as 、 ,..., ,as well as 、 ,..., , generating active power and reactive power , is the working power of the k+2th sampling period, is the reactive power of the k+2th sampling period.

[0022] Step 503: Generate a cost function, and regulate the three-phase PWM rectifier based on the cost function in the k+2th sampling period.

[0023] The control method can control a three-phase PWM rectifier.

[0024] In this embodiment, the three-phase PWM rectifier is provided with a converter , converter and converter , the converter , converter and converter Respectively electrically connected to phase A, phase B and phase C; 、 ,..., ,as well as 、 ,..., ,as well as 、 ,..., ,as well as 、 ,..., , generating active power and reactive power , The power consumption of the k+2th sampling period specifically includes: obtaining the converter In the conduction state of the pth sampling cycle , converter In the conduction state of the pth sampling cycle and converter In the conduction state of the pth sampling cycle ; 、 and The value is 0 or 1, where 0 represents the off state and 1 represents the on state; p is a natural number, p=k-1, k-2, k and k+1; based on 、 and ,generate and ; Based on the formula Generate the instantaneous active power at the k+2th sampling period and reactive power ,in, , , is the line inductance of the three-phase PWM rectifier, is the line resistance of the three-phase PWM rectifier, , ; and, when or hour, , ;when and hour, and are all constants; , ; , , ; , , .

[0025] In this embodiment, the cost function ,in, is the reference value of active power, is the reference value of reactive power, and are all constants.

[0026] In this embodiment, the 、 and ,generate and Specifically include: ,and ,and hour, , ;when ,and ,and hour, , ;when ,and ,and hour, , ;when ,and ,and hour, , 1. When ,and ,and hour, , ;when ,and ,and hour, , ;when ,and ,and hour, , ;when ,and ,and hour, , .

[0027] Figure 1 The topology of a two-level three-phase PWM rectifier is shown. The circuit consists of six power switches, line inductors, , line resistance , three-phase AC power supply e, output capacitor C and load resistance To avoid open circuit on the input side and short circuit on the output side, the upper and lower switches of each phase bridge arm should operate complementary, and the PWM rectifier allows eight switching states.

[0028] In the prior art, In the coordinate system, the grid current change in the k-1th sampling period can be calculated as follows: , ,in, represents the voltage vector applied to the PWM rectifier in the k-1th sampling period, and Represent the current value of the power grid at the k-1th and kth moments respectively Axis component, and Represent the current value of the power grid at the k-1th and kth moments respectively Axis component, the grid current change in the kth sampling period can be calculated. , , the gate current at the k+1th moment can be predicted , , in order to compensate for the one-step delay caused by digital implementation, the grid current at time k+2 is predicted , , further, the predicted grid current can be calculated , In practice, and Can be measured directly, but 、 and It is impossible to obtain them because they represent future grid current changes. To solve this problem, the technical solution introduces two historical grid current change data.

[0029] Since the grid current changes caused by each voltage vector are relatively slow relative to the sampling frequency, the same applied voltage vector and To predict future grid current changes. 、 and It can be obtained by the following methods, such as Figure 2As shown, the LUT table stores the voltage value of the PWM rectifier in several historical sampling cycles and the current change value Axis components and Axis component; Find the voltage value equal to from the LUT table The first historical sampling period of and Set them to the corresponding values ​​of the first historical sampling period Axis components and Axis component; Find the voltage value equal to from the LUT table The second historical sampling period, and Set them to the corresponding second historical sampling period Axis components and Axis components, these values ​​have been stored in the lookup table (LUT, Look Up Table) in the past sampling period.

[0030] Based on the multiple voltage vectors of the PWM rectifier, the PWM rectifier has multiple past grid current changes stored in the LUT. After each sampling period, the multiple past grid current changes in the LUT are updated.

[0031] The instantaneous active power and reactive power at the k+2th moment are calculated as follows:

[0032] in, and Represent the grid voltage at time (k+2) and Since the grid voltage changes much slower than the sampling frequency, Approximately ,Will Approximately .

[0033] In the prior art, when the PWM rectifier is running, since all grid current changes are the same as the basic frequency of the grid voltage, Figure 2 All past grid current changes in the lookup table (LUT) in the equation need to be updated at each sampling period to avoid , However, if after one sampling period, only the past grid current change corresponding to the applied voltage vector in the k-1th sampling period is known, According to its new value In the formula , According to its new value In the formula Therefore, if some past grid current changes are not updated after multiple sampling cycles, these changes may be far from the actual value. This will cause the stagnation of current change update, which will affect the formula , The predicted grid current and , thus degrading the control performance of the PWM rectifier. In the proposed method, two common components of all grid current variations are separated and estimated using the two most recently measured grid current variations. With these two estimated common components, all grid current variations can be easily calculated without identifying voltage vector combinations, unlike previous methods. Because these common components are estimated at every sampling cycle, the proposed method no longer requires updating the stagnant current variation.

[0034] exist Figure 2 In the LUT table, there are 8 historical sampling cycles. For example, it's important to note that the eight current changes in the LUT are historical data and won't be updated without a new sampling cycle. Furthermore, the LUT will only ever contain the grid current changes for eight historical sampling cycles. This is determined by the corresponding voltage vectors, which correspond to eight different switch combinations from the perspective of the switch state; and the corresponding voltage levels from the perspective of the generated voltages. In MFPC, only one voltage vector is applied per sampling cycle. Therefore, after each sampling cycle, a grid current change is updated based on the sampling result. This update updates the current change corresponding to the currently applied voltage vector, and no new voltage vectors are added, as there are only eight voltage vectors in principle.

[0035] The embodiment of the present invention decomposes the grid current change on the basis of the traditional MPFC, proposes a dynamic estimation algorithm, and solves the problem of stagnant update of the current change of the LUT.

[0036] When the PWM rectifier is running, since all grid current changes are the same as the fundamental frequency of the grid voltage, Figure 2 All past grid current changes in the lookup table (LUT) in need to be updated at each sampling period to avoid inaccurate current prediction. However, in conventional model-free predictive control (MFPC), after one sampling period, only the past grid current changes corresponding to the applied voltage vector at the (k-1)th sampling period are available. According to its new value Therefore, if some past grid current changes are not updated after multiple sampling periods, these changes may be far from the actual value. This will cause the stagnation of current change updates, which will affect the predicted grid current. , thus degrading the control performance of the PWM rectifier. In the proposed method, two common components of all grid current variations are separated and estimated using the two most recently measured grid current variations. With these two estimated common components, all grid current variations can be easily calculated without identifying voltage vector combinations, unlike previous methods. Because these common components are estimated at every sampling cycle, the proposed method no longer requires updating the stagnant current variation.

[0037] like Figure 1 The circuit diagram of the three-phase PWM rectifier is shown in FIG. 、 and is the power supply voltage, 、 and is the output voltage of the rectifier rectifier side, where the input inductance of the rectifier AC side is It plays the role of filtering and increasing the DC voltage. The DC side capacitor C acts as an energy storage element and plays a role of voltage stabilization.

[0038] according to Figure 1 , PWM rectifier in The description in the stationary coordinate system is as follows: , ,in, is the line inductance of the three-phase PWM rectifier, is the line resistance of the three-phase PWM rectifier, The grid voltage Axis component, The grid voltage Axis component, The input voltage of the three-phase PWM rectifier is Axis component, The input voltage of the three-phase PWM rectifier is Axis component, The grid current Axis component, The grid current It can be understood that the line inductance and line resistance are both line impedances between the grid and the rectifier.

[0039] By applying the forward Euler method to the above equations, the following discrete-time system model can be obtained: , ,in, and are the current change values ​​of the grid connected to the PWM rectifier in the kth sampling period. Axis components and Axis component, and are the grid voltages connected to the PWM rectifier in the kth sampling period. Axis components and Axis component, and are the grid currents connected to the PWM rectifier in the kth sampling period. Axis components and Axis component, and are the PWM rectifier input voltage in the kth sampling period. Axis components and Axis component, The length of time for each sampling period.

[0040] In the embodiment of the present invention, in order to realize MFPC with simplified control input, a new control input is defined. , .

[0041] Table 1: Switching states and voltage vectors of a pulse width modulated rectifier

[0042] In the above table, the voltage vectors corresponding to the three-phase PWM rectifier are listed. The grid current change in the kth sampling period 、 The components can be expressed as: , .

[0043] To simplify the use of symbols, the two common parts of all grid current changes in the kth sampling period are defined as variables and , as follows: , , , .and then, , .

[0044] In model predictive control (MPC), only one voltage vector is applied during the entire sampling period, and the average switching frequency is much lower than the sampling frequency. To maintain the required control performance, the controller usually operates at a higher sampling frequency, such as 10kHz to 30kHz. In this technical solution, a high sampling frequency controller (≥10kHz) is used to avoid the line inductance and output capacitance problems of the PWM rectifier. When the sampling frequency exceeds 10kHz, It can be approximated as , It can be approximated as The grid current change in the kth sampling period can then be calculated as follows: , .

[0045] Similarly, the grid current change in the (k+1)th sampling period is approximated as , The application of "current change at time k-1" as the approximate value at time k is to simplify the calculation and improve the calculation efficiency while maintaining sufficient accuracy.

[0046] The predicted current can then be calculated , .

[0047] Estimate 、 、 and , this technical solution designs an algorithm. The algorithm analyzes the last two grid current changes and their corresponding voltage vectors. 、 、 and Make an estimate.

[0048] Can get , , , .

[0049] The following equation is obtained: ,in, , .

[0050] ,in, , , 、 、 and The estimation method considers the control input , But different.

[0051] Case 1: or

[0052] In MFPC, only one voltage vector is applied to the converter during one sampling period. Therefore, the PWM rectifier input voltage and The components correspond to the voltage levels and .therefore, of and Components are subject to voltage levels and restrictions.

[0053] At the same time, since the voltage and current change slowly compared to the sampling frequency, , The A term in is almost zero. Therefore, the magnitude of term A is much smaller than the magnitude of term B. , It can be approximately expressed as follows: , .

[0054] therefore, The expression is , The expression is . and Both correspond to voltage vectors , and Both correspond to voltage vectors , the specific values ​​are shown in Table 1. Then, it is calculated that , .

[0055] Case 2: and

[0056] in this case, , Simplified as follows: , .

[0057] then, The expression is as follows , The expression is as follows .

[0058] although and It has been estimated, but because the denominator is 0, it cannot be solved and .

[0059] In the second case, and It is considered to be the same value in the (k-1)th sampling period within the short sampling period.

[0060] The above estimation algorithm is as follows Figure 3 shown.

[0061] exist Figure 3In the estimation algorithm shown, a low-pass filter (LPF) is used to eliminate measurement noise. The cutoff frequency of the first-order low-pass filter is selected as , in order to effectively suppress the switching noise. In the control scheme, the cutoff frequency is set to 26Hz. 、 、 and They are 、 、 and The filtered value of is the phase angle of the grid voltage, which can be obtained from the measured grid voltage. .

[0062] Figure 4 The MFPC control block diagram designed for PWM rectifier is shown. After sampling the grid current, the Figure 3 The estimation algorithm shown is used to calculate 、 、 and Subsequently, the predicted powers P(k+2) and Q(k+2) and the cost function are calculated using the eight voltage vectors in Table 1. In the (k+1)th sampling period, the voltage vector that minimizes the cost function is selected as the optimal voltage vector for controlling the PWM rectifier.

[0063] 、 、 and Based on Table 1 、 、 and and estimated values 、 、 and Since this method estimates 、 、 and , so in this method, there is no need to use Figure 3 The LUT in the MFPC is used to calculate the grid current change, eliminating the problem of stagnant updates of current changes. In addition, there is no need to identify the voltage vector combination that makes traditional MFPC complex when calculating the grid current change.

[0064] The second embodiment of the present invention provides a control device for a PWM rectifier, wherein the PWM rectifier is used for three-phase power, and comprises the following modules: an information acquisition module for acquiring the information of the power grid in the The current value and voltage value of the coordinate system in the jth sampling period, the current value The axis component is as well as The axis component is , the voltage value of The axis component is as well as The axis component is ; Wherein, j and k are natural numbers, j = 1, 2, ..., k; The first processing module is used to 、 ,..., ,as well as 、 ,..., ,as well as 、 ,..., ,as well as 、 ,..., , generating active power and reactive power , is the working power of the k+2th sampling period, is the reactive power of the k+2th sampling period; a second processing module is used to generate a cost function and regulate the three-phase PWM rectifier based on the cost function in the k+2th sampling period.

[0065] In this embodiment, the three-phase PWM rectifier is provided with a converter , converter and converter , the converter , converter and converter are electrically connected to phase A, phase B and phase C respectively; the first processing module is also used to: obtain the converter In the conduction state of the pth sampling cycle , converter In the conduction state of the pth sampling cycle and converter In the conduction state of the pth sampling cycle ; 、 and The value is 0 or 1, where 0 represents the off state and 1 represents the on state; p is a natural number, p=k-1, k-2, k and k+1; based on 、 and ,generate and ; Based on the formula Generate the instantaneous active power at the k+2th sampling period and reactive power ,in, , , is the line inductance of the three-phase PWM rectifier, is the line resistance of the three-phase PWM rectifier, , ; and, when or hour, , ;when and hour, and are all constants; , ; , , ; , , .

[0066] In this embodiment, the cost function ,in, is the reference value of active power, is the reference value of reactive power, and are all constants.

[0067] In this embodiment, the first processing module is further configured to: when ,and ,and hour, , ;when ,and ,and hour, , ;when ,and ,and hour, , ;when ,and ,and hour, , 1. When ,and ,and hour, , ;when ,and ,and hour, , ;when ,and ,and hour, , ;when ,and ,and hour, , .

[0068] Embodiment 3 of the present invention provides an electronic device, including a processor, a memory, and a program or instruction stored in the memory and executable on the processor. When the program or instruction is executed by the processor, the steps of the control method in embodiment 1 are implemented.

[0069] A fourth embodiment of the present invention provides a storage medium, on which a program or instruction is stored. When the program or instruction is executed by a processor, the steps of the control method in the first embodiment are implemented.

[0070] It should be understood that although this specification is described in terms of implementation methods, not every implementation method contains only one independent technical solution. This narrative method of the specification is only for the sake of clarity. Those skilled in the art should regard the specification as a whole. The technical solutions in each implementation method can also be appropriately combined to form other implementation methods that can be understood by those skilled in the art.

[0071] The series of detailed descriptions listed above are only specific descriptions of feasible implementation methods of the present invention. They are not intended to limit the scope of protection of the present invention. Any equivalent implementation methods or changes that do not deviate from the technical spirit of the present invention should be included in the scope of protection of the present invention.

Claims

1. A control method for a PWM rectifier, wherein the PWM rectifier is used for three-phase power, characterized in that: The following steps are involved: Get the grid in The current value and voltage value of the coordinate system in the jth sampling period, the current value The axis component is as well as The axis component is , the voltage value of The axis component is as well as The axis component is ; Wherein, j and k are both natural numbers, j=1, 2, ..., k; based on 、 ,..., ,as well as 、 ,..., ,as well as 、 ,..., ,as well as 、 ,..., , generating active power and reactive power , is the working power of the k+2th sampling period, is the reactive power of the k+2th sampling period; A cost function is generated, and the three-phase PWM rectifier is regulated based on the cost function in the k+2th sampling period.

2. The control method according to claim 1, characterized in that: The three-phase PWM rectifier is provided with a converter , converter and converter , the converter , converter and converter electrically connected to phase A, phase B and phase C respectively; The based 、 ,..., ,as well as 、 ,..., ,as well as 、 ,..., ,as well as 、 ,..., , generating active power and reactive power , The power consumption of the k+2th sampling period specifically includes: obtaining the converter In the conduction state of the pth sampling cycle , converter In the conduction state of the pth sampling cycle and converter In the conduction state of the pth sampling cycle ; 、 and The value is 0 or 1, where 0 represents the off state and 1 represents the on state; p is a natural number, p=k-1, k-2, k and k+1; based on 、 and ,generate and ; Based on the formula Generate the instantaneous active power at the k+2th sampling period and reactive power ,in, , , is the line inductance of the three-phase PWM rectifier, is the line resistance of the three-phase PWM rectifier, , ; and, when or hour, , ;when and hour, and are all constants; , ; , , ; , , .

3. The control method according to claim 2, characterized in that: Cost function ,in, is the reference value of active power, is the reference value of reactive power, and are all constants.

4. The control method according to claim 3, characterized in that: The based 、 and ,generate and Specifically include: when ,and ,and hour, , ;when ,and ,and hour, , ;when ,and ,and hour, , ;when ,and ,and hour, , 1. When ,and ,and hour, , ;when ,and ,and hour, , ;when ,and ,and hour, , ;when ,and ,and hour, , .

5. A control device for a PWM rectifier, wherein the PWM rectifier is used for three-phase power, characterized in that: Includes the following modules: Information acquisition module, used to obtain the power grid The current value and voltage value of the coordinate system in the jth sampling period, the current value The axis component is as well as The axis component is , the voltage value of The axis component is as well as The axis component is ; Wherein, j and k are both natural numbers, j=1, 2, ..., k; The first processing module is used to 、 ,..., ,as well as 、 ,..., ,as well as 、 ,..., ,as well as 、 ,..., , generating active power and reactive power , is the working power of the k+2th sampling period, is the reactive power of the k+2th sampling period; The second processing module is configured to generate a cost function and regulate the three-phase PWM rectifier based on the cost function in the k+2th sampling period.

6. The control device according to claim 5, characterized in that The three-phase PWM rectifier is provided with a converter , converter and converter , the converter , converter and converter electrically connected to phase A, phase B and phase C respectively; The first processing module is further configured to: obtain a converter In the conduction state of the pth sampling cycle , converter In the conduction state of the pth sampling cycle and converter In the conduction state of the pth sampling cycle ; 、 and The value is 0 or 1, where 0 represents the off state and 1 represents the on state; p is a natural number, p=k-1, k-2, k and k+1; based on 、 and ,generate and ; Based on the formula Generate the instantaneous active power at the k+2th sampling period and reactive power ,in, , , is the line inductance of the three-phase PWM rectifier, is the line resistance of the three-phase PWM rectifier, , ; and, when or hour, , ;when and hour, and are all constants; , ; , , ; , , .

7. The control device according to claim 5, characterized in that Cost function ,in, is the reference value of active power, is the reference value of reactive power, and are all constants.

8. The control device according to claim 7, characterized in that: The first processing module is further configured to: when ,and ,and hour, , ;when ,and ,and hour, , ;when ,and ,and hour, , ;when ,and ,and hour, , 1. When ,and ,and hour, , ;when ,and ,and hour, , ;when ,and ,and hour, , ;when ,and ,and hour, , .

9. An electronic device, characterized in that: The method comprises a processor, a memory, and a program or instruction stored in the memory and executable on the processor, wherein the program or instruction, when executed by the processor, implements the steps of the control method according to any one of claims 1 to 4.

10. A storage medium, characterized in that: The storage medium stores a program or instruction, and when the program or instruction is executed by the processor, the steps of the control method according to any one of claims 1 to 4 are implemented.

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