Hedging system and method based on inversion output of double inverters

Abstract

The invention discloses a hedging system and method based on inversion output of double inverters. The hedging system based on the inversion output of the double inverters comprises at least two inverter units, an SPWM waveform controller and a feedback module. The inverter unit is used for converting direct current into alternating current and has a control logic for generating a control signal matched with an output waveform rule; aC output ends of the inverter units are connected with each other so as to output a required AC voltage; the SPWM waveform controller is used for generating a pulse width modulation signal matched with the output waveform rule so as to control the on-off state of the inverter unit; and the feedback module is used for monitoring the output of the inverter unit in real time and feeding back the monitoring result to the control logic for closed-loop regulation. According to the invention, the control process can be simplified, the dependence on external hardware is reduced, and the output waveform of the inverter can be improved.

Description

Technical Field

[0001] The present invention relates to the technical field of power electronics, and in particular to a hedging system based on dual inverter inversion output and a method thereof. Background Art

[0002] As inverters play an important role in modern electrical and electronic systems, how to use sinusoidal pulse width modulation (SPWM) technology to control inverters to improve the performance and efficiency of the entire system has become a hot topic of research.

[0003] The inverter is generally composed of a full-bridge inverter circuit, an SPWM wave module, a drive module and a filter circuit. Among them, the SPWM inverter circuit is the key to generating a pure sine wave. The pulse width modulation (PWM) technology uses a pulse waveform with a variable duty cycle to control the on and off of semiconductor switching devices, thereby generating a series of pulses with equal amplitudes but different widths at the output end to equivalently obtain the required waveform.

[0004] When pulse width modulation is performed, if the duty cycle of the pulse series is arranged according to the sine law, the output voltage can obtain a sine waveform after filtering, and the harmonic components in the load current will be significantly reduced. This process is called sinusoidal pulse width modulation (SPWM). The basic principle of SPWM technology is to generate a pulse sequence with a width that changes according to the sine law by comparing the carrier and the modulation wave, and then drive the switch tube of the inverter to perform switching conversion.

[0005] However, the current traditional SPWM technology still mainly relies on the comparison between the carrier and the modulation wave to generate a pulse sequence to drive the inverter. The complexity of this method lies in the need for additional hardware circuits to process these signals, which increases the cost and design difficulty of the system.

[0006] Therefore, it is urgent to propose a hedging system based on the inverter output of dual inverters and a method thereof to solve the above problems. Summary of the invention

[0007] The purpose of the present invention is to propose a hedging system based on the inverter output of dual inverters and a method thereof, which can simplify the control process, reduce the dependence on external hardware, and also improve the output waveform of the inverter.

[0008] To solve the above technical problems, the present invention provides a hedging system based on dual inverter inversion output and a method thereof, comprising: at least two inverter units, an SPWM waveform controller and a feedback module;

[0009] The inverter unit is used to convert direct current into alternating current and has control logic for generating a control signal that matches the output waveform law;

[0010] The AC output terminals of the inverter units are connected to each other to output the required AC voltage;

[0011] The SPWM waveform controller is used to generate a pulse width modulation signal matching the output waveform rule to control the switching state of the inverter unit;

[0012] The feedback module is used to monitor the output of the inverter unit in real time, and feed back the monitoring result to the control logic for closed-loop regulation.

[0013] Furthermore, the at least two inverter units include: a first inverter unit and a second inverter unit.

[0014] Further, the first inverter unit includes: a rectifier circuit, a first full-bridge inverter circuit and a first MCU;

[0015] The rectifier circuit is used to rectify the AC power supply into DC power;

[0016] The first full-bridge inverter circuit is used to convert direct current into alternating current output;

[0017] The first MCU is used to generate a control signal that matches the output waveform rule.

[0018] Furthermore, the rectifier circuit includes: a plurality of diodes and a protection circuit;

[0019] Anode terminals of some of the diodes are connected to a three-phase AC input terminal, and cathode terminals of all the diodes are connected together to form a DC output terminal;

[0020] The protection circuit is used to detect and prevent overvoltage or overcurrent from occurring in the rectifier circuit.

[0021] Further, the second inverter unit includes: a power supply circuit, a second full-bridge inverter circuit and a second MCU;

[0022] The power supply circuit is used to provide direct current;

[0023] The second full-bridge inverter circuit is used to convert direct current into alternating current output;

[0024] The second MCU is used to generate a control signal that matches the output waveform rule.

[0025] Furthermore, the SPWM waveform controller includes: a parameter acquisition module, a calculation module, a signal sending module and a clock module;

[0026] The parameter acquisition module is used to acquire parameters of multiple preset angles, and the parameters include B value and A value;

[0027] The calculation module is used to calculate the high and low level transmission times and delay times corresponding to a plurality of preset angles according to the parameters;

[0028] The signal sending module is used to send a control signal to the inverter circuit according to the high and low level sending times and the delay time;

[0029] The clock module is used to provide a clock signal with a fixed period for the signal sending module;

[0030] The parameter acquisition module, the calculation module and the signal sending module realize data interaction through an internal bus.

[0031] In addition, the present invention also proposes a hedging method based on the inversion output of a dual inverter, using the hedging system based on the inversion output of a dual inverter as described above, specifically including the following:

[0032] Acquire parameters of multiple preset angles, wherein the parameters include a B value and an A value;

[0033] Calculate the number of high and low level transmissions and delay times corresponding to multiple preset angles according to the parameters;

[0034] A control signal is sent to the inverter circuit according to the high and low level sending times and the delay time.

[0035] Further, the step of calculating the number of high and low level transmissions and the delay time according to the parameters includes:

[0036] The parameter value Y is calculated using the formula Y=B+A*SIN(Φ), where Φ is the preset angle;

[0037] Calculate the number of high level transmissions N_high = Y / 90;

[0038] Calculate the number of low level transmissions N_low = 400-N_high;

[0039] Among them, N_high represents the number of high-level transmissions, and N_low represents the number of low-level transmissions.

[0040] Furthermore, the step of calculating the delay time includes:

[0041] Calculate the high level delay time = (N_high-floor(N_high))*fixed period;

[0042] Calculate the low level delay time = (N_low-floor(N_low))*fixed period;

[0043] Among them, floor represents the rounding down function.

[0044] Furthermore, the method further comprises the steps of:

[0045] When the calculated number of transmissions is less than a preset threshold, the number of transmissions is set to the preset threshold, and the delay time is increased accordingly.

[0046] Through the above technical solution, the present invention has the following beneficial effects:

[0047] By setting at least two inverter units, an SPWM waveform controller and a feedback module; the inverter unit is used to convert direct current into alternating current, and has a control logic for generating a control signal that matches the output waveform law; the AC output terminals of the inverter units are connected to each other to output the required AC voltage; the SPWM waveform controller is used to generate a pulse width modulation signal that matches the output waveform law to control the switching state of the inverter unit; the feedback module is used to monitor the output of the inverter unit in real time, and feed the monitoring results back to the control logic for closed-loop regulation. This system can simplify the control process, reduce the dependence on external hardware, and also improve the output waveform of the inverter. BRIEF DESCRIPTION OF THE DRAWINGS

[0048] Figure 1 It is a schematic diagram of the overall structure of a hedging system based on the inverter output of dual inverters in one embodiment of the present invention;

[0049] Figure 2 It is a structural block diagram of a single inverter unit and an SPWM waveform controller in a hedging system based on dual inverter inverter outputs in one embodiment of the present invention;

[0050] Figure 3 It is a structural schematic diagram of a rectifier circuit in a hedging system based on the inverter output of a dual inverter in one embodiment of the present invention;

[0051] Figure 4 It is a flow chart of a hedging method based on the inversion output of dual inverters in one embodiment of the present invention;

[0052] Figure 5 It is a timing diagram of an SPWM waveform controller in a hedging method based on the inversion output of a dual inverter in one embodiment of the present invention;

[0053] Figure 6 1 is a waveform diagram of a voltage signal on an inductor L in a hedging method based on the inverter output of a dual inverter in an embodiment of the present invention;

[0054] Figure 7 The waveform diagram of the AC signal and the filtered signal of the inverter output in the hedging method based on the inverter output of the dual inverter in one embodiment of the present invention. DETAILED DESCRIPTION

[0055] A hedging system and method based on the inversion output of a dual inverter of the present invention will be described in more detail below in conjunction with the accompanying drawings, wherein preferred embodiments of the present invention are shown, and it should be understood that those skilled in the art can modify the present invention described herein while still achieving the advantageous effects of the present invention. Therefore, the following description should be understood as being widely known to those skilled in the art, and not as a limitation to the present invention.

[0056] The present invention is described in more detail in the following paragraphs by way of example with reference to the accompanying drawings. The advantages and features of the present invention will become more apparent from the following description. It should be noted that the accompanying drawings are in very simplified form and are not in exact proportions, and are only used to facilitate and clearly assist in illustrating the purpose of the embodiments of the present invention.

[0057] like Figure 1-Figure 2 As shown, the embodiment of the present invention proposes a convenient and practical hedging system and method based on the inversion output of dual inverters, including: at least two inverter units, an SPWM waveform controller and a feedback module (which can be Figure 2 It is realized by the host computer software and optical fiber, and the host computer can be, for example, a computer).

[0058] Specifically, the inverter unit is used to convert direct current into alternating current, and has a control logic for generating a control signal that matches the output waveform law; the AC output ends of the inverter unit are interconnected to output the required AC voltage; the SPWM waveform controller is used to generate a pulse width modulation signal that matches the output waveform law to control the switching state of the inverter unit; the feedback module is used to monitor the output of the inverter unit in real time, and feed back the monitoring results to the control logic for closed-loop regulation.

[0059] In this embodiment, the at least two inverter units include: a first inverter unit and a second inverter unit (such as Figure 2 As shown, the first inverter unit and the second inverter unit are inverter 1 and inverter 2 respectively).

[0060] In a specific example, the first inverter unit includes: a rectifier circuit, a first full-bridge inverter circuit and a first MCU.

[0061] Specifically, the rectifier circuit is used to rectify the AC power supply into DC power, for example, rectifying the 380V AC signal into a DC signal to supply power to the first MCU and charge the CD1 capacitor in the first inverter unit. The first full-bridge inverter circuit is used to convert DC power into AC output; the first MCU is used to generate a control signal that matches the output waveform rule.

[0062] Among them, Figure 3As shown, the rectifier circuit includes: a plurality of diodes (such as Figure 3 VT1 / VT2 / VT3 / VT4 / VT5 / VT6) and protection circuits (such as Figure 3 Specifically, the anode ends of some of the diodes are connected to the three-phase AC input end, and the cathode ends of all the diodes are connected together to form a DC output end; the protection circuit is used to detect and prevent overvoltage or overcurrent in the rectifier circuit.

[0063] In addition, this embodiment may further include a filter circuit; the filter circuit is connected in parallel to the DC output end of the rectifier circuit to output an AC signal smoothly.

[0064] In a specific example, the second inverter unit includes: a power supply circuit (i.e., Figure 1 The power supply part in the circuit), the second full-bridge inverter circuit and the second MCU.

[0065] Specifically, the power supply circuit is used to provide direct current; the second full-bridge inverter circuit is used to convert direct current into alternating current output; and the second MCU is used to generate a control signal that matches the output waveform rule.

[0066] The first MCU (i.e. microcontroller) and the second MCU (i.e. microcontroller) of this embodiment are both connected to the SPWM waveform controller. The microcontroller is used to receive the control signal sent by the SPWM waveform controller through the optical fiber and control the operation of the inverter circuit.

[0067] In this embodiment, the first full-bridge inverter circuit and the second full-bridge inverter circuit are used to receive the control signal sent by the SPWM waveform controller through the microcontroller, and perform an inverter operation according to the control signal. The first full-bridge inverter circuit and the second full-bridge inverter circuit both include four power switching devices (such as IGBTs or MOSFETs) to form a full-bridge inverter circuit structure.

[0068] This embodiment also includes output terminals A and B, connected to the output terminals of the first full-bridge inverter circuit and the second full-bridge inverter circuit, for outputting the inverted alternating current. And this embodiment also includes a direct current power supply (CD), that is, CD includes Figure 1 CD1 and CD2 shown in the figure provide a DC input voltage for the inverter circuit.

[0069] In this embodiment, you can continue to refer to Figure 1 and Figure 2 As shown, the SPWM waveform controller includes: a parameter acquisition module, a calculation module, a signal sending module and a clock module.

[0070] Specifically, the parameter acquisition module is used to acquire parameters of multiple preset angles, and the parameters include B value and A value; the calculation module is used to calculate the number of high and low level transmissions and delay times corresponding to the multiple preset angles according to the parameters; the signal sending module is used to send a control signal to the inverter circuit according to the number of high and low level transmissions and the delay time; the clock module is used to provide a fixed-period clock signal for the signal sending module; the parameter acquisition module, the calculation module, and the signal sending module realize data interaction through an internal bus.

[0071] Wherein, the parameter storage module can be an EEPROM or a Flash memory, which is used to store parameters such as the B value and the A value. The calculation module can be a microcontroller or an FPGA, which is used to perform the calculation steps in the method. The signal sending module includes an optical fiber sending unit, which is used to convert the electrical signal into an optical signal and transmit it through an optical fiber to improve the anti-electromagnetic interference capability. The clock module can be a crystal oscillator circuit or a PLL circuit, which is used to generate a stable clock signal to ensure the accuracy of the transmission cycle of the control signal.

[0072] In summary, this embodiment has the following beneficial effects:

[0073] 1. The use of optical fiber to transmit control signals greatly improves the system's ability to resist electromagnetic interference and is suitable for harsh electromagnetic environments.

[0074] 2. Flexible control is achieved through the microcontroller, and system parameters can be quickly adjusted according to different application requirements.

[0075] 3. Simple structure, easy to implement and maintain.

[0076] 4. The full-bridge inverter circuit structure can achieve high-efficiency DC to AC conversion.

[0077] In addition, if Figure 4 As shown, this embodiment also proposes a hedging method based on the inversion output of a dual inverter, using the hedging system based on the inversion output of a dual inverter as described above, specifically including the following steps:

[0078] S1. Obtain parameters of multiple preset angles, wherein the parameters include a B value and an A value;

[0079] S2. Calculate the number of high and low level transmissions and delay times corresponding to multiple preset angles according to the parameters;

[0080] S3. Send a control signal to the inverter circuit according to the high and low level transmission times and the delay time.

[0081] In step S1, these parameters are pre-stored in the parameter storage module. In this embodiment, 10 key angle points are selected, namely 0°, 36°, 72°, 108°, 144°, 180°, 216°, 252°, 288° and 324°. The B value and A value corresponding to each angle point are obtained by experimental optimization and stored in the parameter storage module. For this embodiment, the A and B values ​​are both 18000. This selection simplifies the calculation process while ensuring the symmetry and accuracy of the SPWM waveform.

[0082] It is worth noting that the present embodiment is not limited to the above specific embodiment. In other possible implementations, the system can be adjusted and optimized in various ways according to actual needs. For example, the A and B values ​​can be dynamically adjusted to adapt to different load conditions or output requirements, thereby optimizing the output of the SPWM waveform in real time. Another possible variant is to use different A and B values, such as A value of 18000 and B value of 19000, so that an SPWM waveform with a specific bias can be generated.

[0083] In step S2, the step of calculating the number of high and low level transmissions and the delay time according to the parameters includes:

[0084] S201, using the formula Y=B+A*SIN(Φ) to calculate the parameter value Y, where Φ is a preset angle;

[0085] S202, calculate the number of high level transmission times N_high=Y / 90;

[0086] S203, calculating the number of low level transmission times N_low=400-N_high.

[0087] Among them, N_high represents the number of high-level transmissions, and N_low represents the number of low-level transmissions.

[0088] In this embodiment, the step of calculating the delay time includes:

[0089] S2001, calculate high level delay time = (N_high-floor(N_high))*fixed period;

[0090] S2002, calculate low level delay time = (N_low-floor(N_low))*fixed period.

[0091] Among them, floor represents the rounding down function.

[0092] Furthermore, the method further includes step S4: when the calculated number of transmissions is less than a preset threshold (eg, 10), the number of transmissions is set to the preset threshold, and the delay time is increased accordingly to ensure the stability of the control signal.

[0093] This method can generate SPWM waveforms through pre-stored parameters and simple calculations, without complex carrier and modulation wave comparison circuits, greatly simplifying the circuit structure. At the same time, by sending control signals at a fixed period and performing delay compensation, the sinusoidal characteristics and precise control of the waveform are guaranteed.

[0094] The method of this embodiment has the following beneficial effects:

[0095] 1. The circuit structure is simplified, and there is no need for carrier and modulation wave comparison circuits, which reduces system complexity and cost.

[0096] 2. The SPWM waveform can be generated by pre-storing parameters and simple calculations, which improves the response speed and efficiency of the system.

[0097] 3. Use fixed cycle to send commands and perform delay compensation to ensure the sinusoidal characteristics of the waveform and precise control.

[0098] 4. The system can be flexibly adapted to different application scenarios by adjusting pre-stored parameters, which improves the flexibility and adaptability of the system.

[0099] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. For those skilled in the art, the present invention may have various modifications and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

[0100] In this embodiment, after the SPWM waveform controller is powered on, according to a set of pulse sequence parameters that change according to the sine wave law, the on and off commands of the left and right bridge arm tubes are sent down through the optical fiber. There are two custom commands sent by the SPWM waveform controller to the MCU, namely, a high-level command (0x53: IGBT2 and IGBT3 are turned on, IGBT1 and IGBT4 are turned off) and a low-level command (0xAC: IGBT1 and IGBT4 are turned on, IGBT2 and IGBT3 are turned off) and a locking command (0xAA: IGBT1, IGBT2, IGBT3, IGBT4 are all turned off). The steps are as follows:

[0101] Step 1: According to the calculation formula Y=B+A*SIN(Φ), the number of times each tube is turned on and off within a specified time at a certain angle is calculated, where Φ is radians, and the calculation formula is Y=18000+18000*sin(Φ); According to the calculation formula, the corresponding number of high levels within 2.5us at 36° is 317 and the corresponding number of low levels is 82.

[0102] It takes 2.5us for the SPWM waveform controller to send a command (0x53 and 0xAC) to the MCU, and then a delay of 2.5us, so the cycle of sending a command is 5us. If a command cycle is not satisfied, the delay after sending the command is less than the time of a command cycle, such as Figure 5 .

[0103] According to the above method, the corresponding numbers of high level and low level at 72 degrees, 108 degrees, 144 degrees, 180 degrees, 216 degrees, 252 degrees, 288 degrees, 324 degrees, and 360 degrees are respectively calculated, as shown in Table 1.

[0104] Table 1. Calculation data of the first inverter unit

[0105]

[0106]

[0107] Step 2: The SPWM waveform controller first sends 317 high-level command cycles, then delays for 139 time units (20ns), then sends 82 low-level command cycles, and finally delays for 111 time units. Step 3: Follow step 2 to send the corresponding number and delay of high and low levels at 72°, 108°, 144°, 180°, 216°, 252°, 288°, 324°, and 360°. Step 4: Follow steps 2 and 3 in a loop. Step 5: Output the inverter AC signal at the A and B terminals, such as Figure 6 shown.

[0108] Based on the above formula Y=18000+18000*sin(Φ), the corresponding numbers of high level and low level of 37°, 73°, 109°, 145°, 181°, 217°, 253°, 289°, 325°, and 1° are calculated, as shown in Table 2.

[0109] Table 2. Calculation data for the second inverter unit

[0110]

[0111] More specifically, the process of the first inverter unit inverting and outputting the AC signal is as follows: after the SPWM waveform controller is powered on, the left and right bridge arm tubes of the first inverter unit are in the off state. When the SPWM waveform controller receives the hedge start command, the SPWM waveform controller sends the on and off commands of the left and right bridge arm tubes to the first MCU (i.e. Figure 2 MCU1 in the circuit makes the a1 and b terminals output sinusoidal AC signals.

[0112] The charging process of the first inverter unit to the second inverter unit is as follows: after the a1 and b terminals output sinusoidal AC signals, they are charged to CD2 through the freewheeling diodes (D1, D2, D3, D4). After charging for 2 seconds, CD2 charges the second MCU (i.e. Figure 2 MCU2 in the power supply.

[0113] The synchronization process of the first inverter unit and the second inverter unit is as follows: after charging is completed, the SPWM waveform controller sends a locking command to the first MCU and the second MCU at the same time, so that the left and right bridge arm tubes of the first inverter unit and the second inverter unit are turned off.

[0114] The process of the first inverter unit and the second inverter unit outputting AC signals at the same time is as follows: After synchronization, the SPWM waveform controller sends command parameters to the first MCU and the second MCU according to the pulse sequence parameters corresponding to Table 1 and Table 2, so that the first inverter unit and the second inverter unit output AC signals Ua1b and Ua2b at ends a1 and b, a2 and b respectively. Since the pulse sequence parameters corresponding to Table 1 and Table 2 have a constant angle difference of 1°, Ua1b and Ua2b have a variable voltage difference. The voltage signal on the inductor L is as follows: Figure 7 shown.

[0115] In summary, the hedging system and method based on the inverter output of dual inverters proposed in the present invention have the following advantages:

[0116] By setting at least two inverter units, an SPWM waveform controller and a feedback module; the inverter unit is used to convert direct current into alternating current, and has a control logic for generating a control signal that matches the output waveform law; the AC output terminals of the inverter units are connected to each other to output the required AC voltage; the SPWM waveform controller is used to generate a pulse width modulation signal that matches the output waveform law to control the switching state of the inverter unit; the feedback module is used to monitor the output of the inverter unit in real time, and feed the monitoring results back to the control logic for closed-loop regulation. This system can simplify the control logic, reduce the complexity of the system, improve the waveform generation accuracy, enhance the real-time regulation capability of the system, and also reduce the system cost and energy consumption.

[0117] Obviously, those skilled in the art can make various changes and modifications to the present invention without departing from the spirit and scope of the present invention. Thus, if these modifications and variations of the present invention fall within the scope of the claims of the present invention and their equivalents, the present invention is also intended to include these modifications and variations.

Claims

1. A hedging system based on dual inverter output, characterized in that: include: At least two inverter units, an SPWM waveform controller and a feedback module; The inverter unit is used to convert direct current into alternating current and has control logic for generating a control signal that matches the output waveform law; The AC output terminals of the inverter units are connected to each other to output the required AC voltage; The SPWM waveform controller is used to generate a pulse width modulation signal matching the output waveform rule to control the switching state of the inverter unit; The feedback module is used to monitor the output of the inverter unit in real time, and feed back the monitoring result to the control logic for closed-loop regulation.

2. The hedging system based on the inversion output of dual inverters according to claim 1, characterized in that: The at least two inverter units include: a first inverter unit and a second inverter unit.

3. The hedging system based on the inversion output of dual inverters as claimed in claim 2, characterized in that: The first inverter unit includes: a rectifier circuit, a first full-bridge inverter circuit and a first MCU; The rectifier circuit is used to rectify the AC power supply into DC power; The first full-bridge inverter circuit is used to convert direct current into alternating current output; The first MCU is used to generate a control signal that matches the output waveform rule.

4. The hedging system based on the inversion output of dual inverters as claimed in claim 3, characterized in that: The rectifier circuit includes: a plurality of diodes and a protection circuit; Anode terminals of some of the diodes are connected to a three-phase AC input terminal, and cathode terminals of all the diodes are connected together to form a DC output terminal; The protection circuit is used to detect and prevent overvoltage or overcurrent from occurring in the rectifier circuit.

5. The hedging system based on the inversion output of dual inverters as claimed in claim 2, characterized in that: The second inverter unit includes: a power supply circuit, a second full-bridge inverter circuit and a second MCU; The power supply circuit is used to provide direct current; The second full-bridge inverter circuit is used to convert direct current into alternating current output; The second MCU is used to generate a control signal that matches the output waveform rule.

6. The hedging system based on the inversion output of dual inverters according to claim 1, characterized in that: The SPWM waveform controller includes: a parameter acquisition module, a calculation module, a signal sending module and a clock module; The parameter acquisition module is used to acquire parameters of multiple preset angles, and the parameters include B value and A value; The calculation module is used to calculate the high and low level transmission times and delay times corresponding to a plurality of preset angles according to the parameters; The signal sending module is used to send a control signal to the inverter circuit according to the high and low level sending times and the delay time; The clock module is used to provide a clock signal with a fixed period for the signal sending module; The parameter acquisition module, the calculation module and the signal sending module realize data interaction through an internal bus.

7. A hedging method based on the inversion output of a dual inverter, using the hedging system based on the inversion output of a dual inverter as described in any one of claims 1 to 6, characterized in that: The details include: Acquire parameters of multiple preset angles, wherein the parameters include a B value and an A value; Calculate the number of high and low level transmissions and delay times corresponding to multiple preset angles according to the parameters; A control signal is sent to the inverter circuit according to the high and low level sending times and the delay time.

8. The hedging method based on the inversion output of dual inverters according to claim 7, characterized in that: The step of calculating the number of high and low level transmissions and the delay time according to the parameters comprises: The parameter value Y is calculated using the formula Y=B+A*SIN(Φ), where Φ is the preset angle; Calculate the number of high level transmissions N_high = Y / 90; Calculate the number of low level transmissions N_low = 400-N_high; Among them, N_high represents the number of high-level transmissions, and N_low represents the number of low-level transmissions.

9. The hedging method based on the inversion output of dual inverters according to claim 8, characterized in that: The step of calculating the delay time comprises: Calculate the high level delay time = (N_high-floor(N_high))*fixed period; Calculate the low level delay time = (N_low-floor(N_low))*fixed period; Among them, floor represents the rounding down function.

10. The hedging method based on the inversion output of dual inverters according to claim 7, characterized in that: Also includes the steps: When the calculated number of transmissions is less than a preset threshold, the number of transmissions is set to the preset threshold, and the delay time is increased accordingly.

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