Power decoupling method, device and system based on ac inversion

Abstract

This invention discloses a power decoupling method, apparatus, and system based on AC inverter. The method includes: performing a first decomposition process on an initial current signal and an initial voltage signal based on a first coordinate system to obtain an initial AC quantity signal; performing a second decomposition process on the initial AC quantity signal based on a second coordinate system to obtain a DC quantity signal; performing a third decomposition process on the DC quantity signal based on the first coordinate system to obtain a target AC voltage signal; and obtaining a target control signal based on the target AC voltage signal. The technical solution of this invention, by adding a decoupling module, introduces reactive power into the decoupling module. The decoupling capacitor in the decoupling module has no voltage limitation. Therefore, under the condition of a fixed reactive power, the required capacitor capacity is reduced by increasing the fluctuation of the capacitor voltage, thereby replacing the large-capacity electrolytic capacitor with a small-capacity film capacitor, achieving the purpose of eliminating electrolytic capacitors.

Description

Technical Field

[0001] This invention belongs to the field of power decoupling technology, and particularly relates to a power decoupling method, device and system based on AC inverter. Background Technology

[0002] Currently, in the DC side of power factor correction (PFC) rectification, a large-capacity electrolytic capacitor is typically connected in parallel with the DC bus to maintain a constant DC bus voltage. First, let's analyze the power flow process in the PFC converter. Assuming the AC input voltage and current are both sinusoidal and in phase, the values ​​of the input voltage and input current are as follows:

[0003] Input voltage:

[0004] Input current:

[0005] Where t represents time; ω is the angular frequency; and i is a positive integer;

[0006] The input AC power of the PFC converter is: P i (t)=v i (t)i i (t)=V i I i -V i I i cos(2ωt)

[0007] In the formula: V i I represents the input voltage of the PFC converter; i This represents the input current of the PFC converter.

[0008] Define the average input power of an interleaved parallel PFC converter as P. i From the above formula, we can obtain:

[0009] P i =V i I i

[0010] If the output voltage and current of the Boost-type PFC converter are kept constant, then the output power P0 should be equal to the average value of the input AC power, that is:

[0011] P0 = P i

[0012] However, at this time, the input AC power is:

[0013] P i(t)=P0-P0 cos(2ωt)

[0014] Therefore, the output power is not equal to the average value of the input power, resulting in power imbalance. This power imbalance is the main cause of output voltage fluctuations. The input power is higher than the output power by reactive power, which has a frequency twice that of the grid frequency and an amplitude equal to that of DC power. If this reactive power is not absorbed, it will flow into the output side, causing changes in the output voltage, which in turn affects the current loop setpoint, leading to changes in the input current and consequently affecting the power factor correction capability of the PFC converter.

[0015] Based on the above formula, the reactive power can be obtained as follows:

[0016] P c (t)=-P0 cos(2ωt)

[0017] The function of the parallel electrolytic capacitor on the output side of the Boost type PFC converter is to absorb the reactive power and offset the difference between the input power and the output power.

[0018] By analyzing the power flow of the PFC rectifier module, it can be seen that the electrolytic capacitor in steady state absorbs reactive power flowing in from the AC grid. This reactive power charges and discharges the electrolytic capacitor, causing fluctuations in the DC bus voltage. In order to minimize the fluctuations in the DC bus voltage, the capacitance value of the capacitor connected in parallel to the DC bus must be very large under the premise of absorbing a certain amount of reactive power. Therefore, only electrolytic capacitors with short lifespans can be selected, which greatly shortens the lifespan of the entire circuit. Summary of the Invention

[0019] This invention aims to at least partially solve one of the technical problems in related technologies. Therefore, one object of this invention is to provide a power decoupling method, apparatus, and system based on AC inverters.

[0020] To address the aforementioned technical problems, embodiments of the present invention provide the following technical solutions:

[0021] A power decoupling method based on AC inverter, comprising:

[0022] Based on the first coordinate system, the initial current signal and the initial voltage signal are decomposed to obtain the initial AC signal.

[0023] The initial AC signal is decomposed based on the second coordinate system to obtain the DC signal.

[0024] The DC signal is decomposed based on the first coordinate system to obtain the target AC voltage signal.

[0025] Based on the target AC voltage signal, the target control signal is obtained.

[0026] Optionally, the initial current signal and the initial voltage signal are decomposed based on the first coordinate system to obtain the initial AC quantity signal, including:

[0027] Construct a virtual phase axis;

[0028] Based on the initial phase axis and the virtual phase axis, the first coordinate system is constructed;

[0029] The initial voltage signal and the initial current signal are input into the first coordinate system;

[0030] The first coordinate system performs a first decomposition process on the initial voltage signal to obtain a first AC voltage signal and a second AC voltage signal;

[0031] The first coordinate system performs a first decomposition process on the initial current signal to obtain a first AC current signal and a second AC voltage signal.

[0032] Optionally, the second decomposition processing of the initial AC signal based on the second coordinate system to obtain the DC signal includes:

[0033] The first AC voltage signal and the second AC voltage signal are input into the second coordinate system;

[0034] The second coordinate system performs a second decomposition process on the first AC voltage signal and the second AC voltage signal to obtain the first DC voltage signal and the second DC voltage signal.

[0035] Optionally, the step of performing a third decomposition process on the target DC signal based on the first coordinate system to obtain the target AC voltage signal includes:

[0036] Control the first DC voltage signal and the second DC voltage signal to obtain the first target DC voltage signal and the second target DC voltage signal;

[0037] Based on the first coordinate system, the first target DC voltage signal and the second target DC voltage signal are subjected to a third decomposition process to obtain the first target AC voltage signal and the second target AC voltage signal.

[0038] Optionally, obtaining the target control signal based on the target AC voltage signal includes:

[0039] The target duty cycle is determined based on the first or second target AC voltage signal falling on the initial phase axis.

[0040] Based on the target duty cycle, the target control signal is obtained.

[0041] Optionally, the target duty cycle is calculated based on the inverter control duty cycle and the DC steady-state control duty cycle.

[0042] Optionally, the first coordinate system is a stationary coordinate system;

[0043] The second coordinate system is a rotating coordinate system.

[0044] Embodiments of the present invention also provide a power decoupling device based on AC inverter, comprising:

[0045] The first decomposition module is used to perform a first decomposition process on the initial current signal and the initial voltage signal based on the first coordinate system to obtain the initial AC quantity signal.

[0046] The second decomposition module is used to perform a second decomposition process on the initial AC signal based on the second coordinate system to obtain a DC signal.

[0047] The third decomposition module is used to perform a third decomposition process on the DC signal based on the first coordinate system to obtain the target AC voltage signal.

[0048] The acquisition module is used to acquire the target control signal based on the target AC voltage signal.

[0049] Embodiments of the present invention also provide a power decoupling system based on AC inverter, comprising:

[0050] A decoupling module, comprising a decoupling capacitor, an energy storage inductor, an upper bridge arm, and a lower bridge arm;

[0051] The emitter, energy storage inductor, decoupling capacitor of the upper bridge arm and the emitter of the lower bridge arm are connected in sequence.

[0052] The output module has its input terminal connected to a single-phase AC power grid, and its output terminal connected to the collector of the upper bridge arm and the first terminal of the decoupling capacitor, respectively.

[0053] A control device is connected to the decoupling module. The control device obtains a target control signal based on the decoupling module and controls the working state of the decoupling module based on the target control signal.

[0054] Embodiments of the present invention also provide an electronic device, including a processor, a memory, and a computer program stored in the memory and configured to be executed by the processor, wherein the processor executes the computer program to implement the method described above.

[0055] Embodiments of the present invention also provide a computer-readable storage medium comprising a stored computer program, wherein the computer program, when executed, controls the device containing the computer-readable storage medium to perform the method described above.

[0056] The embodiments of the present invention have the following technical effects:

[0057] The above-mentioned technical solution of the present invention 1) By adding a decoupling module, reactive power is introduced into the decoupling module. The decoupling capacitor in the decoupling module has no voltage limitation. Therefore, under the condition of constant reactive power, the required capacitor capacity is reduced by increasing the fluctuation of the capacitor voltage, thereby replacing the large-capacity electrolytic capacitor with a small-capacity film capacitor, thus achieving the purpose of eliminating the electrolytic capacitor.

[0058] 2) AC inverter control is realized under DC steady state, realizing the conversion from DC control to AC control, and converting the control quantity obtained from AC control into DC control quantity, thus solving the problem of steady-state error in the control quantity.

[0059] Additional aspects and advantages of the invention will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention. Attached Figure Description

[0060] Figure 1 This is a schematic diagram of the structure of a power decoupling system based on an AC inverter provided in an embodiment of the present invention;

[0061] Figure 2 This is a flowchart illustrating the power decoupling method based on AC inverter provided in an embodiment of the present invention.

[0062] Figure 3 This is an example of the process of the power decoupling method based on AC inverter provided in the embodiments of the present invention;

[0063] Figure 4 This is a schematic diagram of the dynamic structure for constructing a virtual phase axis provided in an embodiment of the present invention;

[0064] Figure 5 This is a schematic diagram of the dynamic structure of the system model after the rotation coordinate system transformation provided in the embodiment of the present invention;

[0065] Figure 6 This is a schematic diagram of the dynamic structure of the decoupled control system provided in an embodiment of the present invention;

[0066] Figure 7 This is a schematic diagram of the dynamic structure for acquiring target control signals provided in an embodiment of the present invention;

[0067] Figure 8This is a schematic diagram of the power decoupling device based on AC inverter provided in an embodiment of the present invention. Detailed Implementation

[0068] Embodiments of the present invention are described in detail below, examples of which are illustrated in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and intended to explain the present invention, and should not be construed as limiting the present invention.

[0069] To facilitate understanding of the embodiments by those skilled in the art, some terms are explained below:

[0070] (1) MCU: Microcontroller Unit.

[0071] (2) Buck circuit: step-down converter circuit.

[0072] (3) Boost circuit: boost chopper circuit.

[0073] (4) Park transformation: transforms two stationary coordinate systems into two rotating coordinate systems.

[0074] (5) SPWM: Sinusoidal Pulse Width Modulation.

[0075] like Figure 1 As shown, an embodiment of the present invention provides a power decoupling module based on an AC inverter, comprising:

[0076] The decoupling module includes a decoupling capacitor C, an energy storage inductor L, an upper bridge arm Q2, and a lower bridge arm Q3; wherein, the voltage across the decoupling capacitor C is essentially a DC-DC voltage.

[0077] The emitter of the upper bridge arm Q2, the energy storage inductor L, the decoupling capacitor C, and the emitter of the lower bridge arm Q3 are connected in sequence.

[0078] The circuit structure of the decoupling module can be taken as an example of a bidirectional Buck circuit. Specifically, the power conversion is achieved by chopping. When the upper bridge arm Q2 is turned on, the energy storage inductor L is the output freewheeling current. When the upper bridge arm Q2 is turned off, the output side charges the energy storage inductor L and also provides energy to the load.

[0079] The output module has its input terminal connected to a single-phase AC power grid, and its output terminal connected to the collector of the upper bridge arm Q2 and the first terminal of the decoupling capacitor C, respectively.

[0080] Specifically, the output module includes a PFC converter. The input terminal of the PFC converter is connected to a single-phase AC power grid, and the output terminal of the PFC converter is connected to the collector of the upper bridge arm Q2 and the first terminal of the decoupling capacitor C, respectively.

[0081] Furthermore, it also includes a small-capacity film capacitor C2 and a load, wherein the small-capacity film capacitor C2 and the load are connected in parallel on the DC bus and are respectively connected to the output terminal of the PFC converter;

[0082] Furthermore, in embodiments of the present invention, the circuit structure of the PFC converter can be exemplified by a bidirectional Boost circuit. By chopping, when transistor Q1 is turned on, the input energy is stored in inductor L1. When transistor Q1 is turned off, the base of transistor Q1 and inductor L1 together provide energy for the output, thereby achieving the purpose of boosting. In addition, the PFC converter can also be implemented by uncontrolled rectifier cascaded multiple Boost circuits, controlled rectifier circuits, etc.

[0083] In an embodiment of the present invention, the PFC converter may specifically include: a first diode D1, a second diode D2, a third diode D3, a fourth diode D4 and a fifth diode D5, a capacitor C1, an inductor L1 and a transistor Q1.

[0084] Specifically, the output terminal of the first diode D1 is connected to the input terminal of the second diode D2; both the output terminal of the first diode D1 and the input terminal of the second diode D2 are connected to the output terminal of the single-phase AC power grid.

[0085] The output terminal of the third diode D3 is connected to the input terminal of the fourth diode D4; the input terminal of the third diode D3 is connected to the input terminal of the first diode D1; the output terminal of the fourth diode D4 is connected to the output terminal of the second diode D2; and the output terminals of the third diode D3 and the input terminals of the fourth diode D4 are both connected to the output terminals of the single-phase AC power grid.

[0086] The output terminals of the fourth diode D4 and the second diode D2 are both connected to the second terminal of capacitor C1; the input terminals of the third diode D3 and the first diode D1 are both connected to the first terminal of capacitor C1.

[0087] The output terminals of the fourth diode D4, the second diode D2, and the second terminal of capacitor C1 are all connected to the first terminal of inductor L1; the second terminal of the inductor is connected to the collector of transistor Q1 and the input terminal of the fifth diode D5, respectively.

[0088] The input terminal of the third diode D3, the input terminal of the first diode D1, and the first terminal of the capacitor C1 are all connected to the emitter of the transistor Q1.

[0089] Furthermore, the collector of the upper bridge arm Q2 is connected to the output terminal of the fifth diode D5, the second terminal of the small-capacity film capacitor C2, and the second terminal of the load, respectively; the second terminal of the small-capacity film capacitor C2 is connected to the second terminal of the load; wherein, the small-capacity film capacitor C2 has a filtering function, and its constant DC voltage can be selected according to the user's needs.

[0090] The first terminal of the decoupling capacitor C is connected to the input terminal of the third diode D3, the input terminal of the first diode D1, the emitter of the transistor Q1, the first terminal of the small-capacity thin-film capacitor C2, and the first terminal of the load.

[0091] Furthermore, the decoupling module also includes a lower bridge arm Q3; wherein the collector of the lower bridge arm Q3 is connected to the emitter of the upper bridge arm Q2 and the second end of the energy storage inductor L, respectively.

[0092] The emitter of the lower bridge arm Q3 is connected to the first terminal of the decoupling capacitor C, the input terminal of the third diode D3, the input terminal of the first diode D1, the emitter of the transistor Q1, the first terminal of the small-capacity thin-film capacitor C2, and the first terminal of the load.

[0093] A control device is connected to the decoupling module. The control device obtains a target control signal based on the decoupling module and controls the working state of the decoupling module based on the target control signal. The control device can be an MCU, which is connected to a data interface and receives electrical signals from the decoupling module based on the data interface.

[0094] In practical applications, the MCU collects the voltage of the decoupling capacitor C and the current of the energy storage inductor L of the decoupling module, processes the collected initial voltage and current signals to obtain the processing results, and then calculates the target duty cycle based on the processing results. Based on the target duty cycle, the MCU obtains the target control signal and controls the working state of the decoupling module based on the target control signal.

[0095] Specifically, the single-phase AC power grid inputs AC power to the PFC converter via its input terminal, and the PFC converter outputs DC power to the decoupling module via its output terminal.

[0096] When the target control signal is high, the upper bridge arm Q2 is turned on and the lower bridge arm Q3 is turned off. Then, the PFC converter outputs DC power from the output terminal, which passes through the energy storage inductor L and the decoupling capacitor C in sequence.

[0097] When the target control signal is low, the upper bridge arm Q2 is disconnected and the lower bridge arm Q3 is turned on, and the decoupling capacitor C discharges.

[0098] Repeat the above steps, and during the repetition, the upper bridge arm Q2 and the lower bridge arm Q3 are alternately turned on.

[0099] In an embodiment of the present invention, the decoupling system introduces reactive power into the decoupling module by adding a decoupling module. The decoupling capacitor C in the decoupling module has no voltage limitation. Therefore, under the condition of constant reactive power, the required capacitor capacity is reduced by increasing the fluctuation of the capacitor voltage, thereby replacing the large-capacity electrolytic capacitor with a small-capacity film capacitor, achieving the purpose of eliminating the electrolytic capacitor.

[0100] like Figure 2 As shown, an embodiment of the present invention provides a power decoupling method based on AC inverter, applied to the above-mentioned system, including:

[0101] Step S1: Perform a first decomposition process on the initial current signal and the initial voltage signal based on the first coordinate system to obtain the initial AC quantity signal;

[0102] Specifically, the initial current signal and the initial voltage signal are decomposed based on the first coordinate system to obtain the initial AC quantity signal, including:

[0103] Construct a virtual phase axis;

[0104] Based on the initial phase axis and the virtual phase axis, the first coordinate system is constructed;

[0105] The initial voltage signal and the initial current signal are input into the first coordinate system;

[0106] The first coordinate system performs a first decomposition process on the initial voltage signal to obtain a first AC voltage signal and a second AC voltage signal;

[0107] The first coordinate system performs a first decomposition process on the initial current signal to obtain a first AC current signal and a second AC voltage signal.

[0108] The first decomposition process is vector decomposition.

[0109] In practical applications, assuming the DC bus voltage remains constant, the current flowing into the decoupling module is a sinusoidal AC quantity, and the phase of the current flowing into the decoupling module can be determined based on the load size and the phase of the single-phase AC grid. Therefore, when converting DC quantity into inverter control, the single-phase AC grid voltage can be directly phase-locked, and the phase of the current flowing into the decoupling module can be obtained by increasing the phase difference. Subsequent inverter control is then performed based on this current phase.

[0110] Specifically, inverter control can include:

[0111] The virtual phase axis is used as the β axis, and the initial phase axis is used as the α axis to form the first coordinate system;

[0112] The initial voltage signal and the initial current signal are input into the first coordinate system, wherein the initial voltage signal and the initial current signal are AC quantities.

[0113] Furthermore, the first coordinate system is a stationary coordinate system;

[0114] The second coordinate system is a rotating coordinate system.

[0115] Step S2: Perform a second decomposition process on the initial AC signal based on the second coordinate system to obtain a DC signal;

[0116] Specifically, the second decomposition process of the initial AC signal based on the second coordinate system to obtain the DC signal includes:

[0117] The first AC voltage signal and the second AC voltage signal are input into the second coordinate system;

[0118] The second coordinate system performs a second decomposition process on the first AC voltage signal and the second AC voltage signal to obtain the first DC voltage signal and the second DC voltage signal.

[0119] The second decomposition process is vector decomposition.

[0120] In practical applications, the first AC voltage signal and the second AC voltage signal are transformed into a synchronous rotating coordinate system through Park transformation to obtain the first DC voltage signal and the second DC voltage signal; at this time, both the first DC voltage signal and the second DC voltage signal are DC quantities.

[0121] Step S3: Perform a third decomposition process on the DC signal based on the first coordinate system to obtain the target AC voltage signal;

[0122] Specifically, the step of performing a third decomposition process on the target DC signal based on the first coordinate system to obtain the target AC voltage signal includes:

[0123] Control the first DC voltage signal and the second DC voltage signal to obtain the first target DC voltage signal and the second target DC voltage signal;

[0124] Based on the first coordinate system, the first target DC voltage signal and the second target DC voltage signal are subjected to a third decomposition process to obtain the first target AC voltage signal and the second target AC voltage signal.

[0125] The third decomposition process is vector decomposition.

[0126] In practical applications, DC flow can be controlled in a rotating coordinate system (dq) to eliminate steady-state error. The final result is the control voltage on the dq axis in the rotating coordinate system.

[0127] In this process, the control voltage obtained in the rotating coordinate system is converted into the control voltage in the stationary coordinate system through the inverse Park transformation. The control quantity under the virtual coordinate axis β is ignored, and only the control voltage under the actual coordinate axis α is taken, which is to finally obtain the target AC voltage signal that falls on the α axis.

[0128] Step S4: Based on the target AC voltage signal, obtain the target control signal.

[0129] Specifically, obtaining the target control signal based on the target AC voltage signal includes:

[0130] The target duty cycle is determined based on the first or second target AC voltage signal falling on the initial phase axis.

[0131] Based on the target duty cycle, the target control signal is obtained.

[0132] In practical applications, the target duty cycle of the bidirectional Buckt decoupling module can be obtained by adding the first target AC voltage or the second target AC voltage to the constant DC voltage output by the BUCK circuit and then dividing by the DC bus voltage.

[0133] Furthermore, the target duty cycle is calculated based on the inverter control duty cycle and the DC steady-state control duty cycle.

[0134] The embodiments of the present invention realize the conversion from DC control to AC control, and the conversion of the control quantity obtained from AC control into DC control quantity.

[0135] like Figure 3 As shown, the above embodiments of the present invention can be implemented based on the following methods:

[0136] Coordinate transformations are performed on the initial voltage and initial current to achieve double closed-loop voltage and current and to ensure that the voltage and current are in phase.

[0137] 1) The load size is acquired based on the MCU, and the phase of the voltage signal of the single-phase AC power grid is acquired;

[0138] The reactive power that the decoupling module needs to absorb is:

[0139] P c (t)=-P o cos(2ωt),

[0140] In the formula: P0 is the output power of the PFC converter; t is time; ω is the angular frequency.

[0141] The aforementioned reactive power is related to the load size and the phase of the voltage signal in a single-phase AC power grid.

[0142] 2) Further, assuming the voltage on the DC bus remains constant, the magnitude of the current flowing into the decoupling capacitor C is:

[0143] In the formula, U dc The voltage across the decoupling capacitor C is denoted as C.

[0144] Specifically, the frequency of the current flowing into the decoupling module is twice the voltage frequency of the single-phase AC power grid. When performing phase locking on the current of the decoupling module, the voltage of the single-phase AC power grid needs to be transformed before performing the phase-locked loop (PLL) calculation. Since the PFC converter aims to control the AC voltage and current to be in phase, only the AC voltage needs to be calculated when performing the PLL calculation. According to the following formula, the AC voltage can be squared and only the AC quantity is taken. The phase of this AC quantity is the phase of the current in the decoupling module. In the formula, the negative sign indicates the reference direction of current flow.

[0145] P i (t)=v i (t)i i (t)=V i I i -V i I i cos(2ωt)

[0146] In the formula: V i I represents the input voltage of the PFC converter; i This represents the input current of the PFC converter.

[0147] 3) The initial phase axis is taken as the α axis, and the virtual phase axis is taken as the β axis; wherein, in the embodiments of the present invention, such as Figure 4 As shown, virtual terms are obtained by generalized second-order integral method; where s: differential operator in Laplace transform.

[0148] After obtaining the currents along the α and β axes, the system can be transformed by Park into a rotating coordinate system for phase-locked loop control.

[0149] The Park transformation matrix is ​​as follows:

[0150]

[0151] In the transformation matrix, Θ represents the phase angle.

[0152] Modeling the decoupling module yields:

[0153]

[0154] Based on this modeling, the model is transformed into a rotating coordinate system;

[0155]

[0156] In the formula; R represents the resistance of the load; i L C represents the current in the energy storage inductor; C represents the capacitance of the decoupling capacitor C.

[0157] 4) Based on the above formula, the following can be derived: Figure 5 The system model shown.

[0158] 5) After decoupling, the final result is as follows: Figure 6 The control system shown;

[0159] Among them, K up K ip For proportional gain; K ui K ii The integral gain is ref; the reference value is ref. It is the voltage transfer function; This is the current transfer function.

[0160] 6) such as Figure 7 As shown, after obtaining the control voltage in the rotating coordinate system, the control voltage in the α-axis and β-axis is obtained by inverse Park transformation. The control voltage in the virtual coordinate axis β is discarded, and only the control voltage in the α-axis is taken.

[0161] Where U0 is the DC bus voltage; Uɑ is the target AC voltage of the a axis; Δd is the inverter control duty cycle; 0.5 is the DC steady-state control duty cycle, and the sum of the inverter control duty cycle and the DC steady-state control duty cycle is the target duty cycle.

[0162] Furthermore, the DC steady-state control duty cycle can be 0.5, or it can be preset according to the voltage requirements of the decoupling capacitor C, such as 0.6, 0.4, etc.

[0163] 7) After obtaining the target duty cycle, input the target duty cycle to SPWM to generate the corresponding target control signal. Then, the MCU controls the on / off state of the upper bridge arm Q2 based on the target control signal.

[0164] like Figure 8 As shown, embodiments of the present invention also provide a power decoupling device 800 based on an AC inverter, comprising:

[0165] The first decomposition module 801 is used to perform a first decomposition process on the initial current signal and the initial voltage signal based on the first coordinate system to obtain the initial AC quantity signal.

[0166] The second decomposition module 802 is used to perform a second decomposition process on the initial AC signal based on the second coordinate system to obtain a DC signal.

[0167] The third decomposition module 803 is used to perform a third decomposition process on the DC signal based on the first coordinate system to obtain the target AC voltage signal.

[0168] The acquisition module 804 is used to acquire the target control signal based on the target AC voltage signal.

[0169] Optionally, the initial current signal and the initial voltage signal are decomposed based on the first coordinate system to obtain the initial AC quantity signal, including:

[0170] Construct a virtual phase axis;

[0171] Based on the initial phase axis and the virtual phase axis, the first coordinate system is constructed;

[0172] The initial voltage signal and the initial current signal are input into the first coordinate system;

[0173] The first coordinate system performs a first decomposition process on the initial voltage signal to obtain a first AC voltage signal and a second AC voltage signal;

[0174] The first coordinate system performs a first decomposition process on the initial current signal to obtain a first AC current signal and a second AC voltage signal.

[0175] Optionally, the second decomposition processing of the initial AC signal based on the second coordinate system to obtain the DC signal includes:

[0176] The first AC voltage signal and the second AC voltage signal are input into the second coordinate system;

[0177] The second coordinate system performs a second decomposition process on the first AC voltage signal and the second AC voltage signal to obtain the first DC voltage signal and the second DC voltage signal.

[0178] Optionally, the step of performing a third decomposition process on the target DC signal based on the first coordinate system to obtain the target AC voltage signal includes:

[0179] Control the first DC voltage signal and the second DC voltage signal to obtain the first target DC voltage signal and the second target DC voltage signal;

[0180] Based on the first coordinate system, the first target DC voltage signal and the second target DC voltage signal are subjected to a third decomposition process to obtain the first target AC voltage signal and the second target AC voltage signal.

[0181] Optionally, obtaining the target control signal based on the target AC voltage signal includes:

[0182] The target duty cycle is determined based on the first or second target AC voltage signal falling on the initial phase axis.

[0183] Based on the target duty cycle, the target control signal is obtained.

[0184] Optionally, the target duty cycle is calculated based on the inverter control duty cycle and the DC steady-state control duty cycle.

[0185] In an optional embodiment of the present invention, the first coordinate system is a stationary coordinate system;

[0186] The second coordinate system is a rotating coordinate system.

[0187] Embodiments of the present invention also provide an electronic device, including a processor, a memory, and a computer program stored in the memory and configured to be executed by the processor, wherein the processor executes the computer program to implement the method described above.

[0188] Embodiments of the present invention also provide a computer-readable storage medium comprising a stored computer program, wherein the computer program, when executed, controls the device containing the computer-readable storage medium to perform the method described above.

[0189] Furthermore, other configurations and functions of the apparatus in the embodiments of the present invention are known to those skilled in the art, and will not be described in detail here to reduce redundancy.

[0190] It should be noted that the logic and / or steps represented in the flowchart or otherwise described herein, for example, can be considered as a sequenced list of executable instructions for implementing logical functions, and can be embodied in any computer-readable medium for use by, or in conjunction with, an instruction execution system, apparatus, or device (such as a computer-based system, a processor-included system, or other system that can fetch and execute instructions from, an instruction execution system, apparatus, or device). For the purposes of this specification, "computer-readable medium" can be any means that can contain, store, communicate, propagate, or transmit programs for use by, or in conjunction with, an instruction execution system, apparatus, or device. More specific examples (a non-exhaustive list) of computer-readable media include: an electrical connection having one or more wires (electronic device), a portable computer disk drive (magnetic device), random access memory (RAM), read-only memory (ROM), erasable and editable read-only memory (EPROM or flash memory), fiber optic devices, and portable optical disc read-only memory (CDROM). Alternatively, the computer-readable medium may be paper or other suitable media on which the program can be printed, since the program can be obtained electronically, for example, by optically scanning the paper or other medium, followed by editing, interpreting, or otherwise processing as necessary, and then stored in a computer memory.

[0191] It should be understood that various parts of the present invention can be implemented in hardware, software, firmware, or a combination thereof. In the above embodiments, multiple steps or methods can be implemented in software or firmware stored in memory and executed by a suitable instruction execution system. For example, if implemented in hardware, as in another embodiment, it can be implemented using any one or a combination of the following techniques known in the art: discrete logic modules having logic gate modules for implementing logical functions on data signals, dedicated integrated modules having suitable combinational logic gate modules, programmable gate arrays (PGAs), field-programmable gate arrays (FPGAs), etc.

[0192] In the description of this specification, references to terms such as "one embodiment," "some embodiments," "example," "specific example," or "some examples," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of the invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples.

[0193] In the description of this invention, it should be understood that the terms "center," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial," "radial," and "circumferential" 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 this invention and simplifying the description, and are not intended to 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 this invention.

[0194] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one of that feature. In the description of this invention, "a plurality of" means at least two, such as two, three, etc., unless otherwise explicitly specified.

[0195] In this invention, unless otherwise explicitly specified and limited, the terms "installation," "connection," "linking," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; 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 refer to the internal communication of two components or the interaction between two components, unless otherwise explicitly limited. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0196] In this invention, unless otherwise explicitly specified and limited, "above" or "below" the second feature can mean that the first feature is in direct contact with the second feature, or that the first feature is in indirect contact with the second feature through an intermediate medium. Furthermore, "above," "over," and "on top" of the second feature can mean that the first feature is directly above or diagonally above the second feature, or simply that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature can mean that the first feature is directly below or diagonally below the second feature, or simply that the first feature is at a lower horizontal level than the second feature.

[0197] Although embodiments of the present invention have been shown and described above, it is understood that the above embodiments are exemplary and should not be construed as limiting the present invention. Those skilled in the art can make changes, modifications, substitutions and variations to the above embodiments within the scope of the present invention.

Claims

1. A power decoupling method based on AC inverter, characterized in that, include: Based on the first coordinate system, the initial current signal and the initial voltage signal are decomposed to obtain the initial AC signal. The initial AC signal is decomposed based on the second coordinate system to obtain the DC signal. The DC signal is decomposed based on the first coordinate system to obtain the target AC voltage signal. Based on the target AC voltage signal, obtain the target control signal; Based on the first coordinate system, the initial current signal and the initial voltage signal are decomposed to obtain the initial AC quantity signal, including: Construct a virtual phase axis; Based on the initial phase axis and the virtual phase axis, the first coordinate system is constructed; The initial voltage signal and the initial current signal are input into the first coordinate system; The first coordinate system performs a first decomposition process on the initial voltage signal to obtain a first AC voltage signal and a second AC voltage signal; The first coordinate system performs a first decomposition process on the initial current signal to obtain a first AC current signal and a second AC voltage signal. The second decomposition process of the initial AC signal based on the second coordinate system to obtain the DC signal includes: The first AC voltage signal and the second AC voltage signal are input into the second coordinate system; The second coordinate system performs a second decomposition process on the first AC voltage signal and the second AC voltage signal to obtain the first DC voltage signal and the second DC voltage signal; The step of performing a third decomposition process on the DC signal based on the first coordinate system to obtain the target AC voltage signal includes: Control the first DC voltage signal and the second DC voltage signal to obtain the first target DC voltage signal and the second target DC voltage signal; Based on the first coordinate system, the first target DC voltage signal and the second target DC voltage signal are subjected to a third decomposition process to obtain the first target AC voltage signal and the second target AC voltage signal. The step of acquiring the target control signal based on the target AC voltage signal includes: The target duty cycle is determined based on the first or second target AC voltage signal falling on the initial phase axis. Based on the target duty cycle, the target control signal is obtained.

2. The method according to claim 1, characterized in that, The target duty cycle is calculated based on the inverter control duty cycle and the DC steady-state control duty cycle.

3. The method according to claim 1, characterized in that, The first coordinate system is a stationary coordinate system; The second coordinate system is a rotating coordinate system.

4. A power decoupling device based on AC inverter, characterized in that, include: The first decomposition module is used to perform a first decomposition process on the initial current signal and the initial voltage signal based on the first coordinate system to obtain the initial AC quantity signal. The second decomposition module is used to perform a second decomposition process on the initial AC signal based on the second coordinate system to obtain a DC signal. The third decomposition module is used to perform a third decomposition process on the DC signal based on the first coordinate system to obtain the target AC voltage signal. The acquisition module is used to acquire the target control signal based on the target AC voltage signal; The first decomposition module is specifically used for: constructing a virtual phase axis; constructing a first coordinate system based on the initial phase axis and the virtual phase axis; inputting the initial voltage signal and the initial current signal into the first coordinate system; and performing a first decomposition process on the initial voltage signal in the first coordinate system to obtain a first AC voltage signal and a second AC voltage signal. The second decomposition module is specifically used for: performing a second decomposition process on the initial AC signal based on the second coordinate system to obtain a DC signal, including: inputting the first AC voltage signal and the second AC voltage signal into the second coordinate system; The second coordinate system performs a second decomposition process on the first AC voltage signal and the second AC voltage signal to obtain the first DC voltage signal and the second DC voltage signal; The third decomposition module is specifically used to: control the first DC voltage signal and the second DC voltage signal to obtain the first target DC voltage signal and the second target DC voltage signal; and perform a third decomposition process on the first target DC voltage signal and the second target DC voltage signal based on the first coordinate system to obtain the first target AC voltage signal and the second target AC voltage signal. The acquisition module is specifically used to: determine the target duty cycle based on the first target AC voltage signal or the second target AC voltage signal falling on the initial phase axis; and acquire the target control signal based on the target duty cycle.

5. A power decoupling system based on AC inverter, characterized in that, To implement the power decoupling method based on AC inverter as described in any one of claims 1-3, the method includes: A decoupling module, comprising a decoupling capacitor, an energy storage inductor, an upper bridge arm, and a lower bridge arm; The emitter, energy storage inductor, decoupling capacitor of the upper bridge arm and the emitter of the lower bridge arm are connected in sequence. The output module has its input terminal connected to a single-phase AC power grid, and its output terminal connected to the collector of the upper bridge arm and the first terminal of the decoupling capacitor, respectively. A control device is connected to the decoupling module. The control device obtains a target control signal based on the decoupling module and controls the working state of the decoupling module based on the target control signal.

6. An electronic device, characterized in that, The method includes a processor, a memory, and a computer program stored in the memory and configured to be executed by the processor, wherein the processor, when executing the computer program, implements the method as claimed in any one of claims 1 to 3.

7. A computer-readable storage medium, characterized in that, The computer-readable storage medium includes a stored computer program, wherein, when the computer program is executed, it controls the device on which the computer-readable storage medium is located to perform the method as described in any one of claims 1 to 3.

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