Adjustment control method and circuit of single-phase inverter circuit, and electronic equipment

Abstract

The invention discloses a regulation control method and circuit of a single-phase inverter circuit, and electronic equipment. The regulation control method comprises the following steps: acquiring an output voltage and an output current of the single-phase inverter circuit; performing orthogonal transformation on the output voltage to obtain an orthogonal output voltage; generating an equivalent transformation voltage and an equivalent transformation current by using the orthogonal output voltage; obtaining a target difference signal by using the equivalent transformation voltage, the equivalent transformation current, the output voltage, the output current and the configured virtual impedance; obtaining a modulation reference voltage by using the target difference signal; generating a driving control signal by using the modulation reference voltage; and the driving control signal is sent to the single-phase inverter circuit to trigger the single-phase inverter circuit to change the switching state, so that the output voltage and the output current are adjusted. By means of the mode, the adjustment control method of the single-phase inverter circuit is good in dynamic performance, low in implementation cost and low in power loss, and distribution of active power and reactive power can be effectively adjusted.

Description

Technical Field

[0001] The present application relates to the field of circuit control technology, and in particular to a regulation and control method, circuit, and electronic equipment for a single-phase inverter circuit. Background Art

[0002] Nowadays, with the development of microgrid technology, power supply equipment equipped with single-phase DC / AC (Direct Current / Alternating Current) inverter circuits is widely used in various fields, including industrial power systems, renewable energy integration, grid support, electric vehicle charging stations and island microgrids.

[0003] However, the regulation and control methods of single-phase inverter circuits in related technologies usually adopt voltage loop or current loop control, and the corresponding current and voltage are independently regulated and managed as single variables, resulting in poor dynamic performance. In addition, a low-pass filter circuit needs to be configured to ensure stable and effective signal sampling. The implementation cost is high, the power loss is also large, and the distribution of active power and reactive power cannot be effectively adjusted. Summary of the Invention

[0004] The main technical problem solved by this application is to provide a regulation and control method, circuit, and electronic equipment for a single-phase inverter circuit, which can solve the problems in the existing technology of the regulation and control method for a single-phase inverter circuit having poor dynamic performance, high implementation cost, large power loss, and inability to effectively regulate the distribution of active power and reactive power.

[0005] To solve the above technical problems, a technical solution adopted in the present application is: to provide a regulation and control method for a single-phase inverter circuit, wherein the regulation and control method for the single-phase inverter circuit includes: obtaining the output voltage and output current of the single-phase inverter circuit; performing orthogonal transformation on the output voltage to obtain an orthogonal output voltage; using the orthogonal output voltage to generate an equivalent transformation voltage and an equivalent transformation current; using the equivalent transformation voltage, the equivalent transformation current, the output voltage, the output current and the configured virtual impedance to obtain a target difference signal; using the target difference signal to obtain a modulation reference voltage; using the modulation reference voltage to generate a drive control signal; sending the drive control signal to the single-phase inverter circuit to trigger it to change the switching state, thereby regulating the output voltage and output current.

[0006] Among them, the steps of generating an equivalent conversion voltage and an equivalent conversion current using the orthogonal output voltage include: obtaining the output frequency of the single-phase inverter circuit; obtaining the synchronous phase angle using the output frequency and the rated frequency of the single-phase inverter circuit; obtaining the reference phase angle using the output frequency; generating an equivalent conversion voltage using the synchronous phase angle, the reference phase angle and the preset amplitude voltage; and generating an equivalent conversion current using the reference phase angle and the preset amplitude current.

[0007] Among them, before the step of generating the equivalent conversion voltage using the synchronous phase angle, the reference phase angle and the preset amplitude voltage, it also includes: obtaining the preset amplitude voltage using the rated output voltage of the single-phase inverter circuit.

[0008] Wherein, before the step of generating the equivalent conversion current by using the reference phase angle and the preset amplitude current, the step further includes: obtaining the preset amplitude current by using the rated output current of the single-phase inverter circuit.

[0009] Among them, the number of single-phase inverter circuits is at least two, and at least two single-phase inverter circuits are connected in parallel with each other. The step of using the rated output current of the single-phase inverter circuit to obtain a preset amplitude current includes: dividing the rated apparent power of the currently controlled single-phase inverter circuit by the reference apparent power to obtain a current sharing ratio coefficient; using the rated output current to obtain a preset reference current; and multiplying the preset reference current by the current sharing ratio coefficient to obtain a preset amplitude current.

[0010] Among them, before the step of obtaining the target difference signal using the equivalent conversion voltage, the equivalent conversion current, the output voltage, the output current and the configured virtual impedance, it also includes: obtaining the voltage drop of the output voltage relative to the input voltage of the single-phase inverter circuit when the single-phase inverter circuit operates at the rated output current; and obtaining the configured virtual impedance using the voltage drop.

[0011] The step of obtaining the configured virtual impedance by using the voltage drop includes: obtaining a preset virtual impedance by using the voltage drop; and obtaining the configured virtual impedance by dividing the preset virtual impedance by a current sharing ratio coefficient.

[0012] The step of obtaining the output frequency of the single-phase inverter circuit includes: performing Park transformation on the orthogonal output voltage to obtain a rotating transformation voltage; and performing proportional-integral regulation on the rotating transformation voltage to obtain the output frequency.

[0013] The step of obtaining the synchronous phase angle using the output frequency and the rated frequency of the single-phase inverter circuit includes: performing calculation processing on the output frequency and the rated frequency using a preset power angle function to obtain the synchronous phase angle; wherein the calculation processing formula of the preset power angle function is:

[0014] φ=k φ ×(f0-f);

[0015] Among them, k φ is the frequency-power-angle correlation coefficient, f0 is the rated frequency, f is the output frequency, and φ is the synchronous phase angle.

[0016] The step of obtaining a reference phase angle by using the output frequency includes: performing phase integration processing on the output frequency to obtain the reference phase angle.

[0017] The step of generating an equivalent transformation voltage using the synchronous phase angle, the reference phase angle and the preset amplitude voltage includes: performing an inverse Park transformation on the preset amplitude voltage using the synchronous phase angle and the reference phase angle to obtain the equivalent transformation voltage.

[0018] The step of generating the equivalent transformed current using the reference phase angle and the preset amplitude current includes: performing an inverse Park transformation on the preset amplitude current using the reference phase angle to obtain the equivalent transformed current.

[0019] The step of obtaining the target difference signal using the equivalent transformed voltage, the equivalent transformed current, the output voltage, the output current, and the configured virtual impedance includes: using a preset transfer function to perform computation on the equivalent transformed voltage, the equivalent transformed current, the output voltage, the output current, and the configured virtual impedance to obtain the target difference signal; wherein the computation formula of the preset transfer function is:

[0020]

[0021] in, is the output voltage, is the output current, is the equivalent transformation voltage, is the equivalent conversion current, Z s is to configure the virtual impedance, and d(s) is the target difference signal.

[0022] In order to solve the above technical problems, another technical solution adopted in the present application is: providing a regulation control circuit, wherein the regulation control circuit is used to couple with a single-phase inverter circuit; wherein the regulation control circuit is used to control the single-phase inverter circuit using the regulation control method of the single-phase inverter circuit as described in any of the above items.

[0023] In order to solve the above technical problems, another technical solution adopted in this application is: to provide an electronic device, wherein the electronic device includes a shell and an adjustment control circuit connected to the shell; wherein the adjustment control circuit is the adjustment control circuit described above.

[0024] The beneficial effects of the present application are as follows: Different from the prior art, the regulation and control method of the single-phase inverter circuit provided by the present application obtains the output voltage and output current of the single-phase inverter circuit to perform orthogonal transformation on the output voltage to obtain an orthogonal output voltage, and uses the orthogonal output voltage to generate an equivalent transformation voltage and an equivalent transformation current, uses the equivalent transformation voltage, the equivalent transformation current, the output voltage, the output current and the configured virtual impedance to obtain a target difference signal, uses the target difference signal to obtain a modulation reference voltage, uses the modulation reference voltage to generate a drive control signal, and sends the drive control signal to the single-phase inverter circuit to trigger it to change the switch state. The output voltage and output current are adjusted, so that the voltage and current control can be unified into a generalized voltage-current control framework, providing better control and dynamic performance, and better stability. By configuring the virtual impedance, it can also act as a low-pass filter, effectively suppressing the noise in the voltage signal, thereby improving the overall stability of the control scheme. Moreover, the virtual impedance is not a physical resistor and will not produce actual power loss, so it can simulate the resistance behavior without sacrificing efficiency, and the implementation cost is also low. By configuring the virtual impedance, droop control can also be achieved to effectively adjust the distribution of active power and reactive power. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the following briefly introduces the drawings required for describing the embodiments. Obviously, the drawings described below are only some embodiments of the present application. Those skilled in the art can also derive other drawings based on these drawings without inventive work, among which:

[0026] Figure 1 This is a flow chart of a first embodiment of a regulation and control method for a single-phase inverter circuit of the present application;

[0027] Figure 2 It is a structural diagram of a first embodiment of a regulation control circuit and a single-phase inverter circuit of the present application;

[0028] Figure 3 This is a flow chart of a second embodiment of the regulation and control method for a single-phase inverter circuit of the present application;

[0029] Figure 4 1 is a flow chart of a third embodiment of the regulation and control method for a single-phase inverter circuit of the present application;

[0030] Figure 5 1. It is a structural diagram of an embodiment of a Thevenin equivalent circuit of a single-phase inverter circuit;

[0031] Figure 6 It is a structural schematic diagram of an embodiment of a Thevenin equivalent circuit of multiple single-phase inverter circuits;

[0032] Figure 7 This is a waveform diagram of the general output characteristics of two single-phase inverter circuits running in parallel without implementing a current sharing loop;

[0033] Figure 8 This is a waveform diagram of the general output characteristics of two single-phase inverter circuits with the same Thevenin equivalent parameters running in parallel;

[0034] Figure 9 It is a structural schematic diagram of an implementation method for mutual conversion between the Thevenin equivalent circuit and the Thevenin-Norton equivalent circuit;

[0035] Figure 10 It is a structural schematic diagram of an implementation method for mutual conversion between a single-phase inverter circuit and a Thevenin-Norton equivalent circuit;

[0036] Figure 11 It is a structural diagram of a second embodiment of the regulation control circuit and the single-phase inverter circuit of the present application;

[0037] Figure 12 It is a structural diagram of a third embodiment of the regulation control circuit and the single-phase inverter circuit of the present application;

[0038] Figure 13 This is a logical framework diagram of an embodiment of using a phase-locked loop to achieve output voltage and output current phase synchronization of a single-phase inverter circuit;

[0039] Figure 14 yes Figure 4 A schematic diagram of a flow chart of an embodiment of S37;

[0040] Figure 15 It is a structural schematic diagram of an embodiment of two Thevenin-Norton equivalent circuits operating in parallel;

[0041] Figure 16 yes Figure 15 Schematic diagram of the waveform of the general output characteristics of two Thevenin-Norton equivalent circuits running in parallel;

[0042] Figure 17 yes Figure 4 A schematic diagram of a flow chart of an embodiment of S39;

[0043] Figure 18 Schematic diagram of waveforms of the output voltage and the first embodiment of the improved phase-locked loop for achieving autonomous output current synchronization of three single-phase inverter circuits running in parallel;

[0044] Figure 19 1 is a waveform diagram of the output voltage and output current of the first embodiment of three single-phase inverter circuits running in parallel;

[0045] Figure 20 1 is a waveform diagram of the root mean square value of the output voltage and the root mean square value of the output current of three single-phase inverter circuits operating in parallel in a first embodiment;

[0046] Figure 21 1 is a waveform diagram of the output voltage and output current of the second embodiment of three single-phase inverter circuits operating in parallel;

[0047] Figure 22 1 is a waveform diagram of the root mean square value of the output voltage and the root mean square value of the output current of three single-phase inverter circuits operating in parallel according to a second embodiment;

[0048] Figure 23 Schematic diagram of waveforms of the third embodiment of the output voltage and output current autonomous synchronization achieved by an improved phase-locked loop of three single-phase inverter circuits operating in parallel;

[0049] Figure 24 1 is a waveform diagram of the output voltage and output current of the third embodiment of three single-phase inverter circuits operating in parallel;

[0050] Figure 25 1 is a waveform diagram of the root mean square value of the output voltage and the root mean square value of the output current of three single-phase inverter circuits operating in parallel;

[0051] Figure 26 1 is a waveform diagram of the output voltage and output current of a fourth embodiment of three single-phase inverter circuits operating in parallel;

[0052] Figure 27 1 is a waveform diagram of the root mean square value of the output voltage and the root mean square value of the output current of three single-phase inverter circuits operating in parallel according to a fourth embodiment;

[0053] Figure 28 It is a structural diagram of an embodiment of the electronic device of the present application. DETAILED DESCRIPTION

[0054] The following will be combined with the drawings in the embodiments of this application to clearly and completely describe the technical solutions in the embodiments of this application. Obviously, the described embodiments are only part of the embodiments of this application, not all of the embodiments. Based on the embodiments of this application, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of this application.

[0055] The terms "first", "second" and "third" in this application are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, a feature defined as "first", "second" and "third" may explicitly or implicitly include at least one of such features. In the description of this application, "multiple" means at least two, for example, two, three, etc., unless otherwise clearly and specifically defined. All directional indications in the embodiments of this application (such as up, down, left, right, front, back...) are only used to explain the relative positional relationship, movement, etc. between the components under a certain specific posture (as shown in the accompanying drawings). If the specific posture changes, the directional indication will also change accordingly. In addition, the terms "including" and "having" and any variations thereof 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 limited to the listed steps or units, but may optionally include steps or units that are not listed, or may optionally include other steps or units that are inherent to these processes, methods, products or devices.

[0056] Reference herein to an "embodiment" means that a particular feature, structure, or characteristic described in connection with the embodiment may be included in at least one embodiment of the present application. The appearance of this phrase in various places in the specification does not necessarily refer to the same embodiment, nor does it refer to independent or alternative embodiments that are mutually exclusive of other embodiments. It is understood, both explicitly and implicitly, by those skilled in the art that the embodiments described herein may be combined with other embodiments.

[0057] The present application is described in detail below with reference to the accompanying drawings and implementation methods.

[0058] Please refer to Figure 1 and Figure 2 ,in, Figure 1 This is a flow chart of the first embodiment of the regulation and control method of the single-phase inverter circuit of the present application. Figure 2 This is a schematic diagram of the structure of the first embodiment of the regulation control circuit and the single-phase inverter circuit of the present application. Specifically, it can include the following steps:

[0059] S11: Obtain the output voltage and output current of the single-phase inverter circuit.

[0060] It is understandable that the regulation control method in this embodiment is specifically applied to Figure 2 The switching control of the single-phase inverter circuit 200 shown in FIG. 1 is performed, and the regulation control circuit 100 is coupled to the single-phase inverter circuit 200 ; wherein the regulation control circuit 100 is used to control the single-phase inverter circuit 200 using any regulation control method described herein.

[0061] It is worth noting that the single-phase inverter circuit 200 can specifically be a half-bridge inverter circuit, a full-bridge inverter circuit or other forms of inverter circuit topology, and this embodiment does not impose any limitation on this.

[0062] The regulation control circuit 100 may specifically include a control chip, a DSP (Digital Signal Processing) chip, an MCU (Micro Controller Unit) circuit, a CPU (Central Processing Unit), a single-chip microcomputer, a field programmable gate array, a programmable logic device, a discrete gate or transistor logic device, discrete hardware, or any other reasonable circuit unit with a signal processing function, and this application does not limit this.

[0063] Furthermore, the term "coupled" as used herein encompasses both direct and indirect connection methods. Therefore, if a first circuit is described as being coupled to a second circuit, this means that the first circuit may be directly connected to the second circuit via electrical connection, wireless transmission, optical transmission, or other signal connection methods, or may be indirectly connected to the second circuit via other circuits or connection methods.

[0064] Specifically, the regulation control circuit 100 collects the output voltage and output current of the single-phase inverter circuit 200 in real time.

[0065] The regulation control circuit 100 can sample and obtain the output voltage and output current through a current transformer, a voltage divider, a sampling resistor or any other reasonable built-in monitoring circuit, and this application does not limit this.

[0066] S12: Performing an orthogonal transformation on the output voltage to obtain an orthogonal output voltage.

[0067] Furthermore, the regulation control circuit 100 performs orthogonal transformation on the output voltage to obtain an orthogonal output voltage.

[0068] It is worth noting that since AC voltage and AC current are represented as phasors, i.e., sinusoidal variables, amplitude, frequency, and phase must be specified. To synchronize the frequency and phase of the single-phase inverter circuit 200, the output voltage must be orthogonally transformed to generate orthogonal signals with a 90° phase difference, i.e., orthogonal output voltages.

[0069] The regulation control circuit 100 may be implemented by any reasonable method such as a second-order generalized integrator, a 90° phase-shifted all-pass filter, or a Kalman filter, and this application does not limit this.

[0070] S13: Generate equivalent conversion voltage and equivalent conversion current using the orthogonal output voltage.

[0071] Furthermore, the frequency and phase synchronization parameters provided by the orthogonal output voltage are used to generate an equivalent conversion voltage and an equivalent conversion current.

[0072] S14: Obtain a target difference signal using the equivalent transformed voltage, the equivalent transformed current, the output voltage, the output current, and the configured virtual impedance.

[0073] According to the currently acquired output voltage and output current, the currently generated equivalent conversion voltage, equivalent conversion current and the preset configuration virtual impedance, a target difference signal is calculated using a suitable operation function or program setting.

[0074] Therefore, the target difference signal will change in response to changes in the output voltage and / or output current to ensure the output stability and dynamic performance of the single-phase inverter circuit 200; and through reasonable settings, the virtual impedance is configured to ensure reasonable and reliable output regulation control under different load conditions and power supply capacity of the single-phase inverter circuit 200.

[0075] S15: Obtain a modulation reference voltage using the target difference signal.

[0076] According to the target difference signal, a modulation reference voltage is generated by an appropriate control algorithm, such as a PID (Proportion Integration Differentiation) controller or a PI controller.

[0077] S16: Generate a drive control signal using the modulated reference voltage.

[0078] A corresponding driving control signal is generated according to the modulated reference voltage to trigger the switching element in the single-phase inverter circuit 200 to change its switching state.

[0079] It is worth noting that the drive control signal can specifically be one or more of any reasonable control signals such as a PWM (Pulse Width Modulation) signal or a PFM (Pulse Frequency Modulation) signal, and this application does not limit this.

[0080] S17: Sending a drive control signal to the single-phase inverter circuit to trigger it to change the switch state, thereby adjusting the output voltage and output current.

[0081] The generated drive control signal is sent to the single-phase inverter circuit 200, and the output voltage and current of the single-phase inverter circuit 200 are adjusted by controlling the state change of the switching elements in the single-phase inverter circuit 200 to make them close to the preset target values.

[0082] The above scheme provides better control and dynamic performance and better stability by unifying voltage and current control into a generalized voltage-current control framework. By configuring the virtual impedance, it can also act as a low-pass filter, effectively suppressing the noise in the voltage signal, thereby improving the overall stability of the control scheme. Moreover, the virtual impedance is not a physical resistor and will not produce actual power loss, so it can simulate the behavior of the resistor without sacrificing efficiency, and the implementation cost is also low. By configuring the virtual impedance, droop control can also be achieved to effectively adjust the distribution of active power and reactive power. The introduction of virtual impedance helps to improve the dynamic response characteristics of the system and enhances the stability and robustness of the system. This regulation control method not only improves the performance of the single-phase inverter circuit 200, but also provides a solid technical foundation for realizing efficient and reliable power electronic equipment. By accurately controlling the output of the single-phase inverter circuit 200, it can better meet various application requirements and improve the operating efficiency and reliability of the overall system.

[0083] See also Figure 3 , Figure 3 This is a flow chart of the second embodiment of the regulation control method of the single-phase inverter circuit of the present application. The regulation control method of the single-phase inverter circuit of this embodiment is Figure 1 A flow chart of a detailed implementation of the regulation and control method of the single-phase inverter circuit in FIG. 1 specifically includes the following steps:

[0084] S21: Obtain the output voltage and output current of the single-phase inverter circuit.

[0085] S22: Performing an orthogonal transformation on the output voltage to obtain an orthogonal output voltage.

[0086] Among them, S21 and S22 are Figure 1 S11 and S12 are the same. For details, please refer to S11 and S12 and their related text descriptions, which will not be repeated here.

[0087] S23: Obtain the output frequency of the single-phase inverter circuit.

[0088] Specifically, the regulation control circuit 100 obtains the output frequency of the single-phase inverter circuit 200 from the output port thereof in real time.

[0089] S24: Obtain the synchronous phase angle using the output frequency and the rated frequency of the single-phase inverter circuit.

[0090] Furthermore, the synchronous phase angle is obtained by calculating the output frequency and the rated frequency of the single-phase inverter circuit 200 using the following formula:

[0091] φ=k φ ×(f0-f);

[0092] Among them, k φ represents the coefficient relating the frequency difference to the power angle, f0 represents the rated frequency (50 Hz or 60 Hz), f represents the output frequency detected at the output port of the single-phase inverter circuit 200, and φ represents the synchronization phase angle; the synchronization phase angle is used to ensure that the output of the single-phase inverter circuit 200 remains synchronized with the power grid or other loads.

[0093] S25: Obtain a reference phase angle using the output frequency.

[0094] Specifically, the regulation control circuit 100 can calculate the reference phase angle according to a setting program of the output voltage of the single-phase inverter circuit 200.

[0095] S26: Generate an equivalent transformation voltage using the synchronous phase angle, the reference phase angle, and the preset amplitude voltage.

[0096] It is worth noting that the preset amplitude voltage can be directly set to a constant value corresponding to the required rated output voltage, or the preset amplitude voltage can be obtained by adjusting the rated output voltage according to a specific design goal.

[0097] Furthermore, the synchronous phase angle is added to the reference phase angle to convert the preset amplitude voltage using the combined angle of the synchronous phase angle and the reference phase angle. That is, on the basis of the preset amplitude voltage, a phase parameter corresponding to the sum of the synchronous phase angle and the reference phase angle is added to generate an equivalent transformation voltage, thereby enhancing the frequency-based phase shift control of the output voltage, and using a phase-locked loop to simplify the control of the active and reactive power components in the output voltage.

[0098] S27: Generate an equivalent transformation current using the reference phase angle and the preset amplitude current.

[0099] Similarly, the preset amplitude current can be directly set to a constant value corresponding to the required rated output current, or the rated output current can be adjusted according to a specific design goal to obtain the preset amplitude current.

[0100] Furthermore, the preset amplitude current is converted using the reference phase angle, that is, on the basis of the preset amplitude current, a phase parameter corresponding to the reference phase angle is added to generate an equivalent conversion current.

[0101] S28: Obtain a target difference signal using the equivalent transformed voltage, the equivalent transformed current, the output voltage, the output current, and the configured virtual impedance.

[0102] S29: Obtain a modulation reference voltage using the target difference signal.

[0103] S210: Generate a driving control signal using the modulated reference voltage.

[0104] S211: Sending a drive control signal to the single-phase inverter circuit to trigger it to change the switch state, thereby adjusting the output voltage and output current.

[0105] Among them, S28, S29, S210 and S211 are Figure 1 S14, S15, S16 and S17 are the same. For details, please refer to S14, S15, S16 and S17 and their related text descriptions, which will not be repeated here.

[0106] Furthermore, in one embodiment, before the above-mentioned S26 , the method may further include: obtaining a preset amplitude voltage by utilizing the rated output voltage of the single-phase inverter circuit 200 .

[0107] It is understood that the rated output voltage of the single-phase inverter circuit 200 is the optimal voltage for the single-phase inverter circuit 200 to operate normally for a long period of time, and can be established as the target voltage for the regulation control of the regulation control circuit 100. To ensure that the single-phase inverter circuit 200 meets the requirements of the operation state, the rated output voltage can be used to set a preset amplitude voltage, for example, by directly assigning the rated output voltage to the preset amplitude voltage. The preset amplitude voltage is typically set based on the design specifications and application requirements of the single-phase inverter circuit 200 to ensure that the single-phase inverter circuit 200 can provide the required output voltage level.

[0108] In addition, in the Thevenin-Norton equivalent circuit representation, the preset amplitude voltage may not be limited to the rated voltage, and may be adjusted according to specific design goals, which is not limited in this application.

[0109] Furthermore, in one embodiment, before the above S27 , the method may further include: obtaining a preset amplitude current by utilizing the rated output current of the single-phase inverter circuit 200 .

[0110] Similarly, the rated output current of the single-phase inverter circuit 200 is the optimal current when the single-phase inverter circuit 200 operates normally for a long time, and can be established as the target current for regulation and control of the regulation control circuit 100. In order to ensure that the single-phase inverter circuit 200 meets a good operating state, the rated output current can be used to set a preset amplitude current, such as directly assigning the rated output current to the preset amplitude current, or adjusting the rated output current according to specific design goals to obtain a preset amplitude current. This application does not limit this.

[0111] Furthermore, in one embodiment, the above S28 may further specifically include: using a preset transfer function to perform calculation processing on the equivalent transformed voltage, the equivalent transformed current, the output voltage, the output current, and the configured virtual impedance to obtain a target difference signal;

[0112] The calculation formula of the preset transfer function is:

[0113]

[0114] in, is the output voltage, is the output current, is the equivalent transformation voltage, is the equivalent conversion current, Z s is to configure the virtual impedance, and d(s) is the target difference signal.

[0115] See also Figure 4 , Figure 4 The flowchart of the third embodiment of the regulation control method of the single-phase inverter circuit of the present application is as follows. Figure 3 A flow chart of a detailed implementation of the regulation and control method of the single-phase inverter circuit in FIG. 1 specifically includes the following steps:

[0116] S31: Obtain the output voltage and output current of the single-phase inverter circuit.

[0117] For the convenience of explanation, please refer to Figure 5-Figure 9 ,in, Figure 5 1 is a schematic structural diagram of an embodiment of a Thevenin equivalent circuit of a single-phase inverter circuit. Figure 6 1 is a schematic structural diagram of an embodiment of a Thevenin equivalent circuit of multiple single-phase inverter circuits. Figure 7 This is a waveform diagram of the general output characteristics of two single-phase inverter circuits running in parallel without implementing a current sharing circuit. Figure 8 This is a waveform diagram of the general output characteristics of two single-phase inverter circuits with the same Thevenin equivalent parameters running in parallel. Figure 9 It is a structural diagram of an implementation method for mutual conversion between the Thevenin equivalent circuit and the Thevenin-Norton equivalent circuit.

[0118] like Figure 5 As shown, any single-phase DC / AC circuit can be represented as an equivalent Thevenin voltage source, that is, an AC voltage source Also called equivalent conversion voltage and the output impedance Zs, also known as the configured virtual impedance Z s Composition, AC voltage source Send equivalent transformation current to output impedance Zs And has an output voltage and output current

[0119] like Figure 6As shown in FIG, when multiple single-phase DC / AC circuits (simplified) are connected in parallel without any active current sharing control loop, a droop method needs to be applied to each branch to achieve natural current sharing.

[0120] Specifically, in the absence of an active current sharing loop, each single-phase DC / AC circuit (or branch) has an output impedance Zs1, an output impedance Zs2, ..., an output impedance Zsn (n is an integer greater than 1) to achieve the droop function, and corresponds to a single-phase AC voltage source Single-phase AC voltage source ..., single-phase AC voltage source To send ZLoad power supply output current to single-phase load impedance respectively Power supply output current ...、Power supply output current The total supply voltage is thus obtained and the total supply current

[0121] Output impedances Zs1, Zs2, ..., and Zsn play a key role in achieving proper load sharing between parallel single-phase DC / AC circuits by causing voltage drops proportional to branch currents. By mimicking the behavior of resistive or inductive networks, the droop mechanism helps balance power distribution and minimize circulating currents between parallel single-phase DC / AC circuits, ensuring stable and efficient system operation.

[0122] like Figure 7 As shown in Figure 1, in this configuration, each single-phase DC / AC circuit operates independently, resulting in variations in output current due to differences in internal parameters such as voltage regulation characteristics, impedance, or phase synchronization. These variations can lead to uneven current distribution between the parallel single-phase DC / AC circuits, potentially overloading one unit while underutilizing another. Furthermore, this imbalance can adversely affect system efficiency, reliability, and equipment lifespan.

[0123] For ease of understanding, let the output current of the single-phase DC / AC circuit be I i (i is any one from 1 to n), the equivalent Thevenin output voltage is U i , the output impedance is Z i . Shared common single-phase output voltage The current sharing error can be expressed as follows:

[0124]

[0125] Among them, Z Load is the load impedance. For equal current sharing control, only when When Z1=Z2, the current error Therefore, in practical applications, by and Z i By setting them to the same value, equal current sharing can be achieved.

[0126] like Figure 8 As shown in Figure 2, according to one-port network theory, if each single-phase DC / AC circuit in the parallel branch is designed to have the same Thevenin equivalent parameters, it becomes simple to achieve uniform behavior between the single-phase DC / AC circuits, thereby achieving perfect droop control and equal current sharing.

[0127] In addition, the output voltage of the Thevenin equivalent circuit It will decrease as the output current increases. When the output voltage Preferably equal to the rated voltage Therefore, the Thevenin equivalent voltage source Can be set to:

[0128]

[0129] The formula (2) includes two parts: the rated voltage and the voltage that compensates for the voltage drop caused by the rated current. The output voltage of the Thevenin equivalent circuit is for:

[0130]

[0131] When the output current of the Thevenin equivalent circuit When , there are:

[0132]

[0133] In addition, according to Norton's theorem, the second part of the Thevenin equivalent voltage in formula (4) can be equivalent to a voltage with impedance Z s Parallel current sources therefore, Figure 9 The two circuits in are equivalent:

[0134] Figure 9 The first circuit in the example is the Thevenin equivalent circuit, and the second circuit is the Thevenin and Norton combined equivalent circuit. In this embodiment, the second Thevenin-Norton equivalent circuit will be used as the design model. Set to rated voltage, there is no need to Assuming the rated current, they can be regarded as two degrees of freedom and set according to the design goal. Therefore, in the Thevenin-Norton equivalent circuit, there will be three design degrees of freedom: equivalent transformation voltage Equivalent conversion current Configure virtual impedance Z s .

[0135] Please continue reading Figure 10 , Figure 10 It is a structural diagram of an implementation method for mutual conversion between a single-phase inverter circuit and a Thevenin-Norton equivalent circuit.

[0136] Understandably, Figure 10 (a) is the actual single-phase DC / AC circuit model; (b) is the single-phase Thevenin-Norton equivalent model. In the Thevenin-Norton equivalent circuit representation, there is no need to convert the equivalent voltage Limit to rated voltage, and no need to convert equivalent current is limited to the rated current. Instead, these variables can be viewed as two independent sets of degrees of freedom, allowing them to be adjusted and set according to specific design goals. Therefore, the Thevenin-Norton equivalent circuit provides three degrees of freedom for design optimization: the equivalent transformation voltage Equivalent conversion current Configure virtual impedance Z s .

[0137] This flexibility is the cornerstone of the regulatory control method used in this embodiment, as it enables the development of appropriate control strategies that allow the actual single-phase DC / AC circuit to mimic the desired Thevenin-Norton equivalent circuit behavior. These control strategies enable the single-phase DC / AC circuit to adapt to a variety of operating requirements and conditions, achieving precise performance targets while maintaining robust and efficient functionality. By leveraging these design freedoms, the versatility and control capabilities of single-phase DC / AC circuits can be enhanced, expanding their application and effectiveness in real-world scenarios.

[0138] Please continue to refer to Figure 11 and Figure 12 , Figure 11 This is a structural diagram of a second embodiment of the regulation control circuit and the single-phase inverter circuit of the present application. Figure 12 It is a structural diagram of the third embodiment of the regulation control circuit and the single-phase inverter circuit of the present application.

[0139] Specifically, the regulation control method in this embodiment can be as follows: Figure 11 or Figure 12 The regulation control circuit 300 shown implements regulation control on the single-phase inverter circuit 200 .

[0140] It is understandable that, in some embodiments, the number of the single-phase inverter circuits 200 can be one or at least two, and the number of the regulation control circuits 300 can also be one or at least two accordingly; wherein, when the number of the single-phase inverter circuits 200 is at least two, at least two single-phase inverter circuits 200 are connected to each other in parallel, and each single-phase inverter circuit 200 is coupled to a corresponding regulation control circuit 300 so as to be independently controlled by the regulation control circuit 300.

[0141] It is worth noting that no matter how many single-phase inverter circuits 200 there are, the single-phase inverter circuit 200 controlled by any regulation control circuit 300 uniquely corresponds to it, and is independently controlled by other regulation control circuits 300 without the need for mutual communication, and the corresponding regulation control methods are also the same.

[0142] For ease of understanding, Figure 11 The single-phase inverter circuit 200 and the regulation control circuit 300 shown are each illustrated as an example. The regulation control circuit 300 may further include an operational amplifier sub-circuit 301, a Thevenin-Norton equivalent processing sub-circuit 302, a phase-locked loop processing sub-circuit 303, a configuration impedance sub-circuit 304, a regulation sub-circuit 305 and a driving sub-circuit 306.

[0143] In which, the single-phase inverter circuit 200 is coupled to the driving sub-circuit 306 and is used to couple with the DC source 400 and the resonant output circuit 500. The resonant output circuit 500 includes a first inductor L1, a second inductor L2 and a single-phase capacitor C. The first inductor L1 is coupled to the single-phase inverter circuit 200, the second inductor L2, the single-phase capacitor C and the Thevenin-Norton equivalent processing sub-circuit 302. The second inductor L2 is coupled to the operational amplifier sub-circuit 301 and is used to couple with the back-end signal circuit 600. The operational amplifier sub-circuit 301 is coupled to the Thevenin-Norton equivalent processing sub-circuit 302 and the phase-locked loop processing sub-circuit 303. The Thevenin-Norton equivalent processing sub-circuit 302 is coupled to the configuration impedance sub-circuit 304 and the regulation sub-circuit 305. The regulation sub-circuit 305 is coupled to the driving sub-circuit 306.

[0144] It is worth noting that the DC source 400 can be any reasonable power source with a DC output, such as a battery, a DC voltage regulator, a photovoltaic power supply, an energy storage power supply, etc.; the back-end signal circuit 600 can be a single-phase power grid or a load circuit, and has an equivalent load impedance Z Load .

[0145] Specifically, the Thevenin-Norton equivalent processing sub-circuit 302 obtains the output current of the single-phase inverter circuit 200 output to the back-end signal circuit 600 via the resonant output circuit 500. The operational amplifier sub-circuit 301 is used to acquire the output voltage of the single-phase inverter circuit 200 output to the back-end signal circuit 600 via the resonant output circuit 500 in real time.

[0146] S32: Performing an orthogonal transformation on the output voltage to obtain an orthogonal output voltage.

[0147] It is understood that the principle and method of implementing the Thevenin-Norton equivalent circuit model in a single-phase inverter circuit 200 are explained as follows:

[0148] The Thevenin-Norton equivalent processing sub-circuit 302 processes the output voltage Perform orthogonal transformation to obtain the orthogonal output voltage u αβ .

[0149] It is worth noting that since AC voltage and AC current are expressed in the form of phasors, that is, sinusoidal variables, amplitude, frequency and phase must be given. In order to synchronize the single-phase inverter circuit 200 in frequency and phase, the output voltage must be synchronized. Perform orthogonal transformation, that is, generate orthogonal signals with a phase difference of 90°, that is, orthogonal output voltage u α / u β , for the convenience of explanation, denoted as u αβ , which are actually two signals.

[0150] The regulation control circuit 100 can specifically realize the output voltage by any reasonable method such as a second-order generalized integrator, a 90° phase-shifted all-pass filter or a Kalman filter. The orthogonal transformation is not limited in this application.

[0151] S33: Performing Park transformation on the orthogonal output voltage to obtain a rotation transformation voltage.

[0152] The Thevenin-Norton equivalent processing subcircuit 302 also needs to specify a Thevenin equivalent AC voltage source and Norton equivalent AC current source because and It is expressed in the form of phasor (sinusoidal variable). As mentioned above, each parallel single-phase inverter circuit 200 needs to have the same That is, their voltage amplitude, frequency and phase must be the same; at the same time, The frequencies of the two phases must be the same (for current sharing), or at least in phase (for proportional current sharing); and their frequency and phase synchronization must be achieved through an enhanced phase-locked loop.

[0153] Please continue reading Figure 13 , Figure 13The present invention is a logic framework diagram of an embodiment of using a phase-locked loop to achieve phase synchronization of output voltage and output current of a single-phase inverter circuit.

[0154] Understandably, Figure 13 The phase-locked loop in the circuit can be used in a grid-connected situation to track the grid voltage reference value, and can also be used in an off-grid situation to synchronize all parallel single-phase inverter circuits 200 in frequency and phase. The reference value of is improved by frequency-based phase shift control, and a phase-locked loop is used because it facilitates the control of active and reactive components in the output of the single-phase inverter circuit 200.

[0155] Specifically, if Figure 13 As shown, the phase-locked loop processing sub-circuit 303 obtains the orthogonal output voltage u αβ After that, the orthogonal output voltage u αβ Performing αβ→dq (Park transformation) transformation obtains the rotating transformation voltage Udq.

[0156] It is worth noting that the αβ→dq transformation is used to convert the electrical quantity in the stationary two-phase coordinate system (αβ) to the synchronous rotating coordinate system (dq), converting the AC quantity into the DC quantity and simplifying the control system design.

[0157] The formula for converting the stationary coordinate system (αβ) to the rotating coordinate system (dq) is:

[0158]

[0159] Where θ is the rotation angle (usually the rotor electrical angle), the d-axis is aligned with the rotor magnetic field, and the q-axis leads the d-axis by 90°.

[0160] In the phase-locked loop, the solution based on αβ-dq conversion has a faster response and smaller frequency overshoot than the traditional dq conversion, especially when the grid voltage is distorted.

[0161] The dq→αβ inverse transformation formula is:

[0162]

[0163] Among them, the dq→αβ inverse transformation is used to restore the control quantity in the rotating coordinate system to the stationary coordinate system.

[0164] S34: Perform proportional-integral regulation on the rotary conversion voltage to obtain the output frequency.

[0165] Furthermore, the component voltage Uq in the rotation conversion voltage Udq is PI-regulated to obtain the output frequency f.

[0166] S35: Using a preset power angle function to calculate the output frequency and the rated frequency to obtain a synchronous phase angle.

[0167] Among them, the calculation formula of the preset power angle function is:

[0168] φ=k φ ×(f0-f); (5)

[0169] Among them, k φ represents the correlation coefficient between the frequency difference and the power angle, f0 represents the rated frequency (50 Hz or 60 Hz), f represents the output frequency detected at the output port of the single-phase inverter circuit 200, and φ represents the synchronization phase angle; the synchronization phase angle φ is used to ensure that the output of the single-phase inverter circuit 200 remains synchronized with the power grid or other loads.

[0170] S36: Perform phase integration processing on the output frequency to obtain a reference phase angle.

[0171] Specifically, if Figure 13 As shown, the output frequency f is obtained by performing PI regulation on the rotation conversion voltage Udq obtained above, and then the reference phase angle θ is obtained by performing phase integration processing on the output frequency f.

[0172] S37: Obtain a preset amplitude voltage using the rated output voltage of the single-phase inverter circuit.

[0173] As mentioned above, the preset amplitude voltage Us can be directly set to a constant value, and corresponds to the rated output voltage u required by the single-phase inverter circuit 200. n , or according to the specific design objectives for the rated output voltage u n Adjustment is performed to obtain a preset amplitude voltage Us.

[0174] S38: Obtaining a preset amplitude current using the rated output current of the single-phase inverter circuit.

[0175] Similarly, the preset amplitude current Isa / Isr can be directly set to a constant value, and corresponds to the rated output current i required by the single-phase inverter circuit 200. n , or according to specific design goals, the rated output current i n Adjustment is performed to obtain a preset amplitude current Isa / Isr.

[0176] S39: Obtaining a voltage drop of an output voltage relative to an input voltage of the single-phase inverter circuit when the single-phase inverter circuit operates at a rated output current.

[0177] Specifically, the detection and acquisition of the single-phase inverter circuit 200 operating at the rated output current i n When the output voltage The voltage drop between the input voltage Uin reflects the actual output voltage caused by the internal loss of the single-phase inverter circuit 200, such as the on-resistance of the switching element, the inductance loss, etc. Lower than ideal conditions.

[0178] S310: Utilize the voltage drop to obtain a configured virtual impedance.

[0179] It can be understood that the virtual impedance is a parameter used to control the dynamic behavior of the system. In order to compensate for the voltage drop, the equivalent impedance that needs to be introduced can be calculated by a reasonable function method to obtain the configured virtual impedance Zs, or a suitable configured virtual impedance Zs can be found in the process of real-time feedback adjustment of the voltage drop.

[0180] In the Thevenin-Norton equivalent model, the output impedance Z s =R s +jX s =R s +jωL s is a virtual device used specifically for droop control. Its value determines the slope of the droop control and affects the dynamic response and stability of the Thevenin-Norton equivalent model when connected in parallel with other circuits and / or loads. Using this Thevenin-Norton equivalent model, its output impedance Z can be selected as needed. s Zero output impedance produces a pure AC voltage source The infinite output impedance corresponds to a pure AC current source Any non-zero finite output impedance creates an AC voltage-current combination source for droop control.

[0181] For illustration purposes, let's define a ratio:

[0182]

[0183] This ratio (6) can also be adjusted to achieve the desired dynamic response performance or to match the external line impedance for stability. A larger ratio indicates a more resistive output impedance; a smaller ratio indicates a more inductive output impedance. Unlike a real impedance, this virtual impedance does not introduce actual power loss, making it possible to simulate resistive characteristics without compromising efficiency.

[0184] refer to Figure 8 and Figure 10 , then:

[0185]

[0186] Z1 (or Z2) = Z s ;(8)

[0187] Therefore, when each parallel single-phase inverter circuit 200 operates according to the same Thevenin-Norton equivalent model, the current sharing condition is satisfied, that is, Z i All parallel single-phase inverter circuits 200 will output current uniformly.

[0188] In addition, this method based on the Thevenin-Norton equivalent model can be extended or generalized to be used for proportional current sharing.

[0189] S311: Performing a Park inverse transform on the preset amplitude voltage using the synchronous phase angle and the reference phase angle to obtain an equivalent transformed voltage.

[0190] Specifically, the preset amplitude voltage Us is subjected to dq→αβ inverse transformation, and the sum of the synchronous phase angle φ and the reference phase angle θ is added to obtain the equivalent transformation voltage

[0191] It is understood that the synchronization phase angle φ calculated above will be added to the output voltage The detected reference phase angle θ is used to generate the Thevenin equivalent AC voltage source using this combined angle That is, the equivalent conversion voltage

[0192] S312: Performing an inverse Park transformation on the preset amplitude current using the reference phase angle to obtain an equivalent transformed current.

[0193] Similarly, the preset amplitude current Isa / Isr is inversely transformed from dq to αβ and the reference phase angle θ is added to obtain the equivalent transformed current

[0194] It is understandable that the Norton equivalent AC current source i sαβ Use the specified active current component reference I sa and reactive current component reference I sr And the identified reference phase angle θ is derived. Usually, the active current component reference I sa Set to the required rated output current i n , while the reactive current component reference I sr Set to zero.

[0195] S313: Using a preset transfer function to perform calculations on the equivalent transformed voltage, the equivalent transformed current, the output voltage, the output current, and the configured virtual impedance to obtain a target difference signal.

[0196] It is understandable that after defining the voltage source and current source in the Thevenin-Norton equivalent circuit model, the single-phase inverter circuit 200 parallel connection and current droop control method based on the Thevenin-Norton equivalent circuit model is realized. Figure 10 At the output node, the following equation can be obtained according to Kirchhoff's current law:

[0197]

[0198] In this equation, the equivalent conversion voltage Equivalent conversion current And configure the virtual impedance Z s The output voltage of the single-phase inverter circuit 200 is given in advance. The output current is By guarantee Figure 10 The actual output voltage of the single-phase inverter circuit 200 and output current If the above equations are satisfied, no matter what the topology of the single-phase inverter circuit 200 is, it will behave as a desired Thevenin-Norton equivalent circuit model.

[0199] In the actual single-phase inverter circuit 200, the simulation of the AC Thevenin-Norton equivalent model is implemented through a composite voltage-current regulator (also called the Thevenin-Norton equivalent model simulator), that is, the Thevenin-Norton equivalent processing subcircuit 302. In the Thevenin-Norton equivalent processing subcircuit 302, the current and voltage are combined together as a variable for control, imitating the relationship of the above formula (9).

[0200] The Thevenin-Norton equivalent processing subcircuit 302 is incorporated into the control via the following transfer function (10):

[0201]

[0202] The goal of the Thevenin-Norton equivalent processing subcircuit 302 is to adjust and maintain d(s) = 0. When this condition is met, formula (10) holds true, and the proposed AC Thevenin-Norton equivalent circuit is physically implemented in the actual single-phase inverter circuit 200. In addition, a virtual output impedance Z is introduced. s , thus achieving droop control.

[0203] Through Normalization is performed. This normalization allows the use of virtual output impedances ranging from zero to infinity. Zero virtual output impedance corresponds to a voltage controller, while infinite output impedance corresponds to a current controller. Any non-zero finite output impedance results in a composite voltage-current controller. Therefore, this approach generalizes a voltage or current controller to a unified voltage-current controller.

[0204] S314: Obtain a modulation reference voltage using the target difference signal.

[0205] The regulating subcircuit 305 generates a modulation reference voltage according to the target difference signal through an appropriate control algorithm, such as a PID controller or a PI controller.

[0206] S315: Generate a driving control signal using the modulated reference voltage.

[0207] Specifically, the driving sub-circuit 306 generates a corresponding driving control signal according to the modulated reference voltage, so as to trigger the switching element in the single-phase inverter circuit 200 to change its switching state.

[0208] S316: Sending a drive control signal to the single-phase inverter circuit to trigger it to change the switch state, thereby adjusting the output voltage and output current.

[0209] The driving sub-circuit 306 sends the generated driving control signal to the single-phase inverter circuit 200, and adjusts the output voltage of the single-phase inverter circuit 200 by controlling the state change of the switching element in the single-phase inverter circuit 200. and output current to bring it close to the preset target value.

[0210] Please continue reading Figure 14 , Figure 14 yes Figure 4 In one embodiment, the regulation and control method of the single-phase inverter circuit of the present application includes, in addition to the above-mentioned S31-S316, further including some more specific steps. Specifically, the above-mentioned S37 may further include the following steps:

[0211] S371: Divide the rated apparent power of the currently controlled single-phase inverter circuit by the reference apparent power to obtain a current sharing proportional coefficient.

[0212] Please continue reading Figure 15 and Figure 16 , Figure 15 is a schematic diagram of an embodiment of two Thevenin-Norton equivalent circuits operating in parallel. Figure 16 yes Figure 15 Schematic diagram of the waveform of the general output characteristics of two Thevenin-Norton equivalent circuits running in parallel.

[0213] There is the following voltage equation:

[0214]

[0215] If you set Then we have:

[0216]

[0217] At the same time, there is an output current equation:

[0218]

[0219] because Then we have:

[0220]

[0221] If we define a desired current sharing coefficient k as:

[0222]

[0223] Combining formulas (14), (16) and (17), we can obtain:

[0224]

[0225] Theoretically, the current sharing coefficient k in formula (18) can be selected arbitrarily. In practical applications, it is usually selected based on the rated capacity of the single-phase inverter circuit 200, also known as the rated apparent power, for example:

[0226]

[0227] Among them, S i represents the rated apparent power corresponding to each single-phase inverter circuit 200. In other words, the contribution of each parallel-connected single-phase inverter circuit 200 depends on its capacity, i.e., the rated apparent power. A parallel-connected single-phase inverter circuit 200 with a larger capacity will provide more current to the load, while a parallel-connected single-phase inverter circuit 200 with a smaller capacity will provide less current.

[0228] Specifically, when the number of single-phase inverter circuits 200 is at least two, in order to avoid the regulation control circuits 300 determining the proportional current sharing logic through mutual communication, each regulation control circuit 300 pre-sets a reference apparent power according to the power supply requirements, so as to divide the rated apparent power of the currently controlled single-phase inverter circuit 200 by the reference apparent power to obtain the current sharing proportional coefficient k, that is, the current sharing proportional coefficient k is determined using formula (18) and formula (19).

[0229] For example, when the reference apparent power is defined as S2 and the rated apparent power of the currently controlled single-phase inverter circuit 200 is S1, the current sharing ratio coefficient k=S1 / S2.

[0230] S372: Obtain a preset reference current using the rated output current.

[0231] Furthermore, the rated output current i nc Assign a preset reference current, or set the rated output current i according to specific design goals. n Adjustment is performed to obtain a preset reference current, which is not limited in this application.

[0232] S373: Multiply the preset reference current by the current sharing ratio coefficient to obtain a preset amplitude current.

[0233] Furthermore, using the above formula (18) and formula (19), the preset reference current is multiplied by the current sharing ratio coefficient k to obtain the preset amplitude current Isa / Isr.

[0234] It is understandable that the above calculation process is repeated for any additional parallel single-phase inverter circuit 200 to obtain the preset amplitude current Isa / Isr corresponding to each regulation control circuit 300 in turn.

[0235] When the Thevenin-Norton equivalent model parameters are defined, each parallel-connected single-phase inverter circuit 200 will deliver current to the load according to its rated capacity, based on its individual characteristics. This approach ensures that the share of the total current provided by each single-phase inverter circuit 200 is consistent with its maximum power rating, promoting balanced load sharing. By integrating the Thevenin-Norton equivalent model into the system, the current provided by each single-phase inverter circuit 200 is directly related to its impedance and voltage characteristics, achieving efficient and stable operation.

[0236] Furthermore, this model not only facilitates proportional current sharing among parallel single-phase inverter circuits 200, but also enables seamless scalability. As more single-phase inverter circuits 200 are added to the parallel configuration, the system can dynamically adjust to maintain the same proportional relationship between all units. This scalability ensures that the entire system can handle varying load conditions while optimizing the performance and lifespan of each single-phase inverter circuit 200.

[0237] It should be noted that when k = 1, that is, the equivalent parameters of each single-phase inverter circuit 200 are the same, and the system follows the above-mentioned equal current sharing method. However, when k ≠ 1, the proportional current sharing method is adopted, that is, each single-phase inverter circuit 200 provides current according to its capacity. By using the Thevenin-Norton equivalent method, single-phase inverter circuits 200 of any type and specification can be directly connected in parallel to achieve uniform or proportional current sharing according to their capacity, without worrying about overloading each parallel single-phase inverter circuit 200.

[0238] Please continue reading Figure 17 , Figure 17 yes Figure 4 In one embodiment, the regulation and control method of the single-phase inverter circuit of the present application includes, in addition to the above-mentioned S31-S316, further including some more specific steps. Specifically, the above-mentioned S39 may further include the following steps:

[0239] S391: Obtain a preset virtual impedance using the voltage drop.

[0240] Specifically, virtual impedance is a parameter used to control the dynamic behavior of the system. In order to compensate for the voltage drop, the equivalent impedance that needs to be introduced can be calculated by a reasonable function to obtain the configured virtual impedance Z. s , or find a suitable preset virtual impedance during the real-time feedback adjustment of the voltage drop.

[0241] S392: Divide the preset virtual impedance by the current sharing ratio coefficient to obtain the configured virtual impedance.

[0242] Furthermore, using formula (18) and formula (19), we can get Divide the preset virtual impedance by the current sharing coefficient k to obtain the configured virtual impedance Z s .

[0243] It is understandable that the above calculation process is repeated for any additional parallel single-phase inverter circuit 200 to obtain the corresponding configuration virtual impedance Z of each regulation control circuit 300. s .

[0244] By adopting this control scheme, the single-phase inverter circuit 200 operates as a Thevenin-Norton equivalent circuit, effectively achieving the required droop control.

[0245] Model simulators can be implemented using an MCU or DSP, with their functionality implemented through firmware programming. In an MCU-based implementation, the simulator leverages the microcontroller's general-purpose computing power to perform the required mathematical calculations and signal processing. This approach is suitable for applications with modest computational requirements and tight integration with other system components, such as monitoring, communication, or auxiliary control functions.

[0246] In a DSP-based implementation, the simulator benefits from the DSP's specialized architecture, which is optimized for high-speed arithmetic operations and real-time signal processing. This makes the DSP well-suited for handling the complex calculations and high-speed control loops required in power electronics applications.

[0247] Both approaches involve the design and development of firmware customized for the hardware platform. The firmware must be optimized to efficiently perform tasks such as simulating the Thevenin-Norton model, calculating difference signals, and implementing real-time control algorithms. Advanced techniques such as fixed-point arithmetic, interrupt-based processing, and multithreading (where supported) can further improve the simulator's performance and responsiveness.

[0248] Other considerations include ensuring compatibility with the system's broader control architecture, such as integration with PWM generation modules, communication interfaces, and safety monitoring mechanisms. Through robust firmware design, the model simulator can achieve precise control and reliable operation, whether deployed on an MCU or DSP.

[0249] This novel approach operates independently on each single-phase inverter circuit 200, enabling the control algorithm to execute autonomously without relying on external coordination. Theoretically, any number of actual single-phase inverter circuits 200 configured with this Thevenin-Norton equivalent circuit model can be directly connected in parallel at their outputs without requiring communication between units. This approach ensures precise current sharing, achieving equal or proportional current distribution.

[0250] This innovative droop control method, based on the Thevenin-Norton equivalent circuit model, was developed to improve the performance of multiple AC single-phase inverter circuits 200 operating in parallel. It helps achieve equal and proportional current distribution among the single-phase inverter circuits 200, ensuring optimal load sharing and improving system stability. Comprehensive simulation studies have fully verified the effectiveness and reliability of this method, demonstrating its ability to handle complex parallel single-phase inverter circuit 200 configurations with high accuracy and efficiency.

[0251] The above solution utilizes an autonomous phase-locked loop and operates under droop control. This eliminates the need for additional communication between the regulation control circuits 300 during the regulation control of the parallel single-phase inverter circuits 200. This allows the single-phase inverter circuits 200 to be directly operated in parallel without any restrictions on modularity, providing a seamless and truly plug-and-play solution.

[0252] Because current sharing accuracy depends primarily on the settings of the Thevenin-Norton equivalent model, it is simpler and more effective to use digital control circuits such as MCUs or DSPs. These digital circuits can flexibly implement the desired model while ensuring accuracy.

[0253] The control scheme based on the Thevenin-Norton equivalent model is independent of the hardware implementation of the actual single-phase inverter circuit 200, such as the topology and component parameters and the corresponding hardware modulation method. The regulation control method in this embodiment is mainly a firmware task of the intelligent or digital power supply.

[0254] The Thevenin-Norton equivalent model is a universal AC power source equivalent model. Zero virtual impedance produces a pure AC voltage source, while infinite virtual impedance corresponds to a pure AC current source. Any non-zero finite virtual impedance produces a composite AC voltage-current source. This allows the single-phase inverter circuit 200 to be easily connected in parallel and operate stably to power any load simply by adjusting the virtual impedance.

[0255] The proposed Thevenin-Norton equivalent model is implemented in the firmware of the single-phase inverter circuit 200, and any heterogeneous single-phase inverter circuits 200 of different types, topologies, capacities and specifications can be connected in parallel to achieve accurate uniform or proportional current sharing.

[0256] Virtual impedance Z s =R s +sLs Equivalent to the series impedance of the AC voltage source. s The impedance is virtual and, unlike a real resistor, does not generate real power losses. This makes it possible to simulate resistor behavior without compromising efficiency.

[0257] Because the virtual impedance Z s =R s +sL s Appearing in the denominator of the transfer function, it acts as a low-pass filter, suppressing noise in the voltage signal. This is different from the noise amplification that occurs in traditional virtual impedance control, thereby improving the stability of the entire control scheme.

[0258] Since the slope of the droop control is determined by the virtual impedance, adjusting the virtual impedance can adjust the current sharing, which is easily achieved through digital control.

[0259] The regulation control method in this embodiment does not use the output voltage The main voltage control loop and / or for the output current Instead of using a secondary current control loop (or vice versa), a composite voltage-current controller is used, combining current and voltage as a single variable, mimicking the Thevenin-Norton equivalent model. The virtual impedance can be chosen arbitrarily: zero virtual output impedance corresponds to a voltage controller, while infinite output impedance yields a current controller. Any nonzero finite output impedance yields a composite current-voltage controller. This approach thus generalizes a voltage or current controller into a composite voltage-current controller, offering superior control and dynamic characteristics compared to traditional single voltage or current controllers.

[0260] By employing a Norton current source in parallel with the Thevenin equivalent in the regulation control circuit, this approach compensates for the voltage drop caused by the load, thereby improving the dynamic performance during load changes.

[0261] Through comprehensive simulation research, the effectiveness and reliability of the regulation control method in this embodiment have been fully verified, and it has been proved that it can handle complex parallel single-phase inverter circuit 200 configurations with high precision and high efficiency to achieve parallel connection of multiple AC single-phase inverter circuits 200 and current sharing (uniform and proportional) droop control.

[0262] Please continue to refer to Figures 18-20 ,in, Figure 18 This is a waveform diagram of the output voltage of three single-phase inverter circuits running in parallel and the first embodiment of the improved phase-locked loop to achieve autonomous synchronization of output current. Figure 19 FIG1 is a waveform diagram of the output voltage and output current of the first embodiment of three single-phase inverter circuits running in parallel. Figure 20The figure is a waveform diagram of the RMS value of the output voltage and the RMS value of the output current of three single-phase inverter circuits running in parallel according to the first embodiment.

[0263] (a) Off-grid current sharing simulation

[0264] In this simulation, a 230Vac / 5000W single-phase inverter circuit 200 is used to verify the parallel connection and current sharing method, and also to verify its dynamic response performance. For off-grid applications, the parallel single-phase inverter circuit 200 is expected to work as a voltage source. Therefore, the AC voltage source in the Thevenin-Norton equivalent model is Set to 230Vac, set the virtual impedance to a smaller value, |Z s |=0.1Ω, making the Thevenin-Norton equivalent circuit model look like a voltage source. Parallel AC current source The current is set to 22A to compensate for the voltage drop at rated current. In the simulation, three real-world AC single-phase inverter circuits 200 were created and connected in parallel using the same proposed Thevenin-Norton equivalent model simulator. As previously mentioned, since this model-based droop control scheme is independent of the hardware implementation, topology, and modulation scheme of the single-phase inverter circuit 200, these multiple real-world single-phase inverter circuits 200 can be modeled with different inverter bridge structures, component selections, and PWM modes. The following are the simulation results:

[0265] From the above results we can see that:

[0266] First, all output currents of the three parallel single-phase inverter circuits 200 are Second, thanks to the composite voltage-current controller, the Thevenin-Norton equivalent model simulator is Figure 19 and Figure 20 It demonstrates fast dynamic response characteristics and optimal performance over a large load range.

[0267] When I o = 0A, which is equivalent to the open circuit state (OC). According to the Thevenin-Norton equivalent model, the open circuit voltage is U o =U s +I s ×|Z s |=230V+22A×0.1Ω=232.2V. Figure 13 Simulated output voltage in same.

[0268] When I o =11.5A, according to the Thevenin-Norton equivalent model, the output voltage U o =U s +(I s -I o)×|Z s |=230V+(22A-11.5A)×0.1Ω=231V. This is also consistent with the above Figure 13 Simulated output voltage in same.

[0269] When I o =26.72A, according to the Thevenin-Norton equivalent model, the output voltage U o =U s +(I s -I o )×|Z s |=230V+(22A-26.72A)×0.1Ω=229.5V. Figure 13 Simulated output voltage in same.

[0270] This result verifies that the use of this simulation control scheme can ensure that all multiple (3) parallel single-phase inverter circuits 200 can perfectly behave as the same Thevenin-Norton equivalent model and achieve accurate current sharing, regardless of the topology of the single-phase inverter circuit 200.

[0271] Please continue to refer to Figure 21-22 ,in, Figure 21 FIG. 1 is a waveform diagram of the output voltage and output current of the second embodiment of three single-phase inverter circuits running in parallel. Figure 22 This is a waveform diagram of the RMS value of the output voltage and the RMS value of the output current of three single-phase inverter circuits running in parallel according to a second embodiment.

[0272] (b) Off-grid proportional current sharing simulation:

[0273] In this simulation, three different single-phase inverter circuits 200 are used to demonstrate the proposed parallel proportional current sharing method: 230Vac / 5000W, 230Vac / 2500W, and 230Vac / 1670W. Therefore, the current sharing ratio coefficient k can be set to 5000W:2500W:1670W = 6:3:2. We set U for the Thevenin-Norton equivalent model of the first 230V / 5000W single-phase inverter circuit 200200 s =230V, Z s1 =0.1Ω, and I s1 =22A. Thus, using formula (18) and formula (19), the V of the second 230V / 2500W single-phase inverter circuit 200 can be obtained. s =230V, Z s2 =0.2Ω, I s2 =11A, and the third 230V / 1670W single-phase inverter circuit 200Vs =230V, Z s3 =0.3Ω, I s3 =7.3A. When these three different single-phase inverter circuits 200 are connected in parallel, the simulation results are as follows:

[0274] From the above Figure 22 It can be seen that in steady state, no matter how the load changes, the three different single-phase inverter circuits 200 always accurately distribute the output current according to the desired current sharing ratio k=6:3:2. In addition, the simulation also shows that the proposed control scheme has excellent dynamic response performance even for different implementations of the single-phase inverter circuit 200 .

[0275] Please continue to refer to Figure 23-Figure 25 ,in, Figure 23 This is a waveform diagram of the third embodiment of the output voltage and output current autonomous synchronization of three single-phase inverter circuits running in parallel. Figure 24 FIG. 1 is a waveform diagram of the output voltage and output current of the third embodiment of three single-phase inverter circuits running in parallel. Figure 25 This is a waveform diagram of the third embodiment of the root mean square value of the output voltage and the root mean square value of the output current of three single-phase inverter circuits running in parallel.

[0276] (c) Grid-connected current sharing simulation:

[0277] In this simulation, a 230Vac / 5000W single-phase inverter circuit 200 is used to verify this parallel and current sharing method and its dynamic response performance. For grid-connected applications, the parallel single-phase inverter circuit 200 is expected to act as a current source and inject the desired current into the grid. Therefore, in the Thevenin-Norton equivalent model, the parallel AC current source Set to 22A or 14A, virtual impedance is set to a larger value, |Z s |=100, making the Thevenin-Norton equivalent circuit model look like a current source. AC voltage source The voltage is set to 230Vac, the same as the grid voltage. Three real-world AC single-phase inverter circuits 200 were created in parallel using the same proposed Thevenin-Norton equivalent model simulator. As previously mentioned, since this model-based droop control scheme is independent of the hardware implementation, topology, and modulation scheme of the single-phase inverter circuit 200, these multiple real-world single-phase inverter circuits 200 can be modeled with different inverter bridge structures, component selections, and PWM modes. The following are the simulation results:

[0278] From the above Figure 23 、 Figure 24 and Figure 25 The results show that:

[0279] First, all output currents of the three parallel single-phase inverter circuits 200 are Always remain the same. Regardless of the output current How much is it? Since it is connected to the grid, the output voltage of the single-phase inverter circuit 200 Second, thanks to the composite voltage-current controller, the Thevenin-Norton equivalent model simulator has fast dynamic response characteristics and optimal performance over a large load range.

[0280] Please continue to refer to Figure 26-Figure 27 ,in, Figure 26 FIG. 1 is a waveform diagram of the output voltage and output current of the fourth embodiment of three single-phase inverter circuits running in parallel. Figure 27 This is a waveform diagram of the fourth embodiment of the root mean square value of the output voltage and the root mean square value of the output current of three single-phase inverter circuits running in parallel.

[0281] (D) Grid-connected proportional current sharing simulation:

[0282] In this simulation, three different single-phase inverter circuits 200 are used to demonstrate the proposed grid-connected proportional current sharing method: 230Vac / 5000W, 230Vac / 2500W, and 230Vac / 1670W. Therefore, the current sharing ratio coefficient k is set to 5000W:2500W:1670W = 6:3:2. We set U for the first 230V / 5000W single-phase inverter circuit 200 s =230V, Z s1 =100Ω, and I s1 =22A / 14A.

[0283] Thus, using formula (18) and formula (19), the V of the second 230V / 2500W single-phase inverter circuit 200 can be obtained. s =230V, Z s2 =200Ω, =11A / 7A, and the third 230V / 1670W single-phase inverter circuit 200 V s =230V, Z s3 =300Ω, I s3 =7.33A / 4.67A. When these three different single-phase inverter circuits 200 are connected to the grid, the simulation results are as follows:

[0284] From the above Figure 26 and Figure 27 It can be seen that in steady state, no matter how the load demand changes, the three different single-phase inverter circuits 200 always accurately distribute the output current according to the desired current sharing ratio k=6:3:2. In addition, the simulation also shows that the proposed control scheme has excellent dynamic response performance even for different implementations of the single-phase inverter circuit 200 .

[0285] These results verify that the use of this simulation control scheme can ensure that all multiple (3) parallel single-phase inverter circuits 200 can perfectly behave as the same Thevenin-Norton equivalent model and achieve accurate proportional current sharing, regardless of the topology of the single-phase inverter circuit 200.

[0286] All simulations confirmed the feasibility and effectiveness of this novel draught control method based on the Thevenin-Norton equivalent model in paralleling multiple single-phase AC inverter circuits 200 and ensuring accurate current sharing. They also demonstrated that the Thevenin-Norton equivalent model simulation control scheme using a composite voltage-current simulator has excellent dynamic response performance.

[0287] The parallel power-sharing single-phase inverter circuit 200 is widely used in applications where power scalability, reliability improvement, thermal load management, and system flexibility improvement are very important.

[0288] Here are some key application areas:

[0289] 1. Renewable energy systems (solar and wind):

[0290] Photovoltaic power generation system: Solar panels generate direct current (DC) electricity, which must be converted to alternating current (AC) before it can be fed into the power grid or used in homes. Multiple single-phase inverter circuits 200 are typically connected in parallel to handle larger solar panel arrays and ensure system scalability.

[0291] Wind energy systems: Similar to solar power, wind turbines may generate DC power via a DC bus, which is then converted to AC for grid use or distributed applications. Multiple single-phase inverter circuits 200 ensure continuous system operation even if a single-phase inverter circuit 200 fails, improving system reliability. Parallel single-phase inverter circuits 200 are also used in home backup power systems, ensuring that if a single-phase inverter circuit 200 fails, the remaining single-phase inverter circuits 200 continue to provide power.

[0292] 2. UPS (Uninterrupted Power Supply) system:

[0293] In critical applications such as data centers, hospitals, and industrial facilities, parallel single-phase inverter circuits 200 are used in UPS systems to convert DC power from batteries into AC power, ensuring continuous power supply during power outages. Parallel operation increases system capacity and provides redundancy. Parallel single-phase inverter circuits 200 can expand the capacity of the UPS system to meet varying power requirements, which is crucial for critical loads requiring high availability. Redundant single-phase inverter circuits 200 provide backup in the event of a single unit failure, improving the reliability of the UPS system.

[0294] 3. Microgrids and off-grid power systems:

[0295] In a microgrid, parallel single-phase inverter circuits 200 are used to stably and reliably convert various DC power sources into AC power for local distribution. They help integrate multiple power sources and energy storage systems (such as batteries or renewable energy sources), providing flexibility and resilience. This is critical in remote areas or island power systems where grid connections are unavailable or unreliable. As energy demand grows, the system can be easily expanded by adding more single-phase inverter circuits 200. Off-grid homes or small communities often rely on these single-phase inverter circuits 200 for energy management when using solar, wind, or hydroelectric power. As homes and businesses increase their use of solar energy storage, parallel single-phase inverter circuits 200 are critical for managing the conversion of battery DC to AC power for local use and / or backup, and often have the ability to sell excess power back to the grid. Parallel single-phase inverter circuits 200 help manage larger loads and adapt to changing power demands. The single-phase parallel single-phase inverter circuit 200 is used in a distributed energy system to provide support functions of a microgrid or an off-grid power system, such as load balancing, frequency regulation, and voltage stabilization.

[0296] 4. Energy storage system and backup power system:

[0297] Energy storage solutions, such as battery systems combined with renewable energy, often use parallel single-phase inverter circuits 200 to convert stored DC energy into AC power. This facilitates peak shaving, energy trading, and load balancing in residential and commercial settings. These single-phase inverter circuits 200 feed AC power from the energy storage system back into the grid. In industrial and commercial settings, where equipment needs to operate continuously, parallel single-phase inverter circuits 200 are used to convert DC power from backup energy storage (such as batteries or fuel cells) into AC power to power critical equipment. In commercial and industrial settings, parallel single-phase inverter circuits 200 manage large and varying loads, providing stability and efficiency to ensure smooth operation of equipment during grid power fluctuations. Telecom base stations often require a reliable power source, and parallel single-phase inverter circuits 200 convert DC power from battery backup systems into AC power to power telecom equipment. The redundancy provided by parallel single-phase inverter circuits 200 ensures uninterrupted service.

[0298] In summary, paralleling single-phase inverter circuits 200 and managing power sharing are crucial for applications requiring flexibility, scalability, redundancy, and reliable power distribution. These approaches improve the performance and adaptability of power systems across various industries and use cases.

[0299] The single-phase inverter circuit 200 connected in parallel is mainly used to not affect the output voltage Increase the total output current in the case of By adopting the parallel single-phase inverter circuit 200 in these areas, organizations can achieve higher reliability, scalability, optimized efficiency, and better thermal control in their power management systems. By addressing these key factors, the parallel single-phase inverter circuit 200 has become indispensable in various fields. These applications highlight the importance of reliable power management and distribution to support modern infrastructure and technology.

[0300] This application also provides an electronic device, see Figure 28 , Figure 28 1 is a schematic diagram of the structure of an electronic device according to an embodiment of the present invention. In this embodiment, the electronic device 40 includes a housing 41 and a regulating control circuit 42 connected to the housing 41 .

[0301] It should be noted that the regulating control circuit 42 described in this embodiment is the regulating control circuit 100 or the regulating control circuit 300 described in any one of the above embodiments. Figure 1-Figure 27 And the related text content will not be repeated here.

[0302] The beneficial effects of the present application are as follows: Different from the prior art, the regulation and control method of the single-phase inverter circuit provided by the present application obtains the output voltage and output current of the single-phase inverter circuit to perform orthogonal transformation on the output voltage to obtain an orthogonal output voltage, and uses the orthogonal output voltage to generate an equivalent transformation voltage and an equivalent transformation current, uses the equivalent transformation voltage, the equivalent transformation current, the output voltage, the output current and the configured virtual impedance to obtain a target difference signal, uses the target difference signal to obtain a modulation reference voltage, uses the modulation reference voltage to generate a drive control signal, and sends the drive control signal to the single-phase inverter circuit to trigger it to change the switch state. The output voltage and output current are adjusted, so that the voltage and current control can be unified into a generalized voltage-current control framework, providing better control and dynamic performance, and better stability. By configuring the virtual impedance, it can also act as a low-pass filter, effectively suppressing the noise in the voltage signal, thereby improving the overall stability of the control scheme. Moreover, the virtual impedance is not a physical resistor and will not produce actual power loss, so it can simulate the resistance behavior without sacrificing efficiency, and the implementation cost is also low. By configuring the virtual impedance, droop control can also be achieved to effectively adjust the distribution of active power and reactive power.

[0303] The above description is only an implementation method of the present application and does not limit the patent scope of the present application. Any equivalent structure or equivalent process transformation made using the contents of the description and drawings of this application, or directly or indirectly applied in other related technical fields, are also included in the patent protection scope of the present application.

Claims

1. A regulation and control method for a single-phase inverter circuit, characterized in that: The regulation and control method of the single-phase inverter circuit includes: Obtaining the output voltage and output current of the single-phase inverter circuit; Performing an orthogonal transformation on the output voltage to obtain an orthogonal output voltage; generating an equivalent conversion voltage and an equivalent conversion current by utilizing the orthogonal output voltage; Obtaining a target difference signal using the equivalent conversion voltage, the equivalent conversion current, the output voltage, the output current, and a configured virtual impedance; Obtaining a modulation reference voltage using the target difference signal; generating a drive control signal using the modulation reference voltage; The driving control signal is sent to the single-phase inverter circuit to trigger it to change the switch state, thereby adjusting the output voltage and the output current.

2. The regulation and control method of a single-phase inverter circuit according to claim 1, characterized in that: The step of generating an equivalent conversion voltage and an equivalent conversion current by using the orthogonal output voltage comprises: Obtaining the output frequency of the single-phase inverter circuit; Obtaining a synchronous phase angle using the output frequency and the rated frequency of the single-phase inverter circuit; Obtaining a reference phase angle using the output frequency; generating the equivalent conversion voltage using the synchronous phase angle, the reference phase angle, and a preset amplitude voltage; The equivalent conversion current is generated using the reference phase angle and a preset amplitude current.

3. The regulation and control method of a single-phase inverter circuit according to claim 2, characterized in that: Before the step of generating the equivalent conversion voltage by using the synchronous phase angle, the reference phase angle and the preset amplitude voltage, the method further includes: The preset amplitude voltage is obtained by utilizing the rated output voltage of the single-phase inverter circuit.

4. The regulation and control method of a single-phase inverter circuit according to claim 2, characterized in that: Before the step of generating the equivalent conversion current by using the reference phase angle and the preset amplitude current, the method further includes: The preset amplitude current is obtained by utilizing the rated output current of the single-phase inverter circuit.

5. The regulation and control method of a single-phase inverter circuit according to claim 4, characterized in that: There are at least two single-phase inverter circuits, and at least two of the single-phase inverter circuits are connected in parallel. The step of obtaining the preset amplitude current by using the rated output current of the single-phase inverter circuit includes: The rated apparent power of the currently controlled single-phase inverter circuit is divided by the reference apparent power to obtain a current sharing proportional coefficient; Obtaining a preset reference current using the rated output current; The preset reference current is multiplied by the current sharing proportional coefficient to obtain the preset amplitude current.

6. The regulation and control method of a single-phase inverter circuit according to claim 5, characterized in that: Before the step of obtaining a target difference signal by using the equivalent conversion voltage, the equivalent conversion current, the output voltage, the output current, and configuring a virtual impedance, the step further includes: obtaining a voltage drop of the output voltage relative to the input voltage of the single-phase inverter circuit when the single-phase inverter circuit operates at the rated output current; The configured virtual impedance is obtained using the voltage drop.

7. The regulation and control method of a single-phase inverter circuit according to claim 6, characterized in that: The step of obtaining the configured virtual impedance by utilizing the voltage drop comprises: obtaining a preset virtual impedance using the voltage drop; The configured virtual impedance is obtained by dividing the preset virtual impedance by the current sharing proportional coefficient.

8. The regulation and control method of a single-phase inverter circuit according to claim 2, characterized in that: The step of obtaining the output frequency of the single-phase inverter circuit includes: Performing a Park transformation on the quadrature output voltage to obtain a rotational transformation voltage; The rotation conversion voltage is subjected to proportional-integral regulation to obtain an output frequency.

9. The regulation and control method of a single-phase inverter circuit according to claim 2, characterized in that: The step of obtaining a synchronous phase angle by using the output frequency and the rated frequency of the single-phase inverter circuit comprises: Using a preset power angle function to perform calculation processing on the output frequency and the rated frequency to obtain the synchronous phase angle; The calculation formula of the preset power angle function is: φ=k φ ×(f0-f); Among them, k φ is the frequency-power-angle correlation coefficient, f0 is the rated frequency, f is the output frequency, and φ is the synchronous phase angle.

10. The regulation and control method of a single-phase inverter circuit according to claim 2, characterized in that: The step of obtaining a reference phase angle by using the output frequency comprises: Performing phase integration processing on the output frequency to obtain the reference phase angle.

11. The regulation and control method of a single-phase inverter circuit according to claim 2, characterized in that: The step of generating the equivalent conversion voltage by using the synchronous phase angle, the reference phase angle and the preset amplitude voltage includes: The equivalent transformed voltage is obtained by performing an inverse Park transform on the preset amplitude voltage using the synchronous phase angle and the reference phase angle.

12. The regulation and control method of a single-phase inverter circuit according to claim 2, characterized in that: The step of generating the equivalent conversion current by using the reference phase angle and the preset amplitude current includes: The reference phase angle is used to perform an inverse Park transformation on the preset amplitude current to obtain the equivalent transformed current.

13. The regulation and control method for a single-phase inverter circuit according to any one of claims 1 to 12, characterized in that: The step of obtaining a target difference signal by using the equivalent conversion voltage, the equivalent conversion current, the output voltage, the output current, and configuring a virtual impedance includes: Using a preset transfer function to perform calculation processing on the equivalent conversion voltage, the equivalent conversion current, the output voltage, the output current, and the configured virtual impedance to obtain the target difference signal; The calculation formula of the preset transfer function is: in, is the output voltage, is the output current, is the equivalent conversion voltage, is the equivalent conversion current, Z s is the configured virtual impedance, and d(s) is the target difference signal.

14. A regulating control circuit, characterized in that: The regulation control circuit is used to couple with the single-phase inverter circuit; The regulation control circuit controls the single-phase inverter circuit using the regulation control method for the single-phase inverter circuit according to any one of claims 1 to 13.

15. An electronic device, characterized in that: The electronic device includes a housing and a regulating control circuit connected to the housing; Wherein, the regulation control circuit is the regulation control circuit as claimed in claim 14.

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