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Control method, system, electronic device and storage medium of single-phase off-grid inverter

A control method and inverter technology, applied in collectors, electric energy management, electric vehicles, etc., can solve problems such as complex AC load characteristics, difficulty in suppressing periodic voltage distortion, and inverter output voltage distortion, and achieve the elimination of inverter To solve the problem of output voltage distortion, improve adaptability, and improve the effect of dynamic response

Active Publication Date: 2022-06-28
UNITED AUTOMOTIVE ELECTRONICS SYST
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] (1) In V2L applications, the types of AC loads such as household appliances are varied, the characteristics of AC loads are complex, and there are many operating conditions. It is a complex system with strong nonlinearity. Its mathematical model cannot be established, and it is difficult to use any inverter control method. Guarantee the quality of the output waveform under different load conditions
[0004] (2) The traditional PI control can track the step signal without static error, but for the single-phase off-grid inverter, the sampled voltage sampling signal and current sampling signal are both AC signals. The controller cannot track the voltage sampling signal and current sampling signal
[0005] (3) The rectifier AC load often has a large capacitor behind the rectifier bridge. When the rectifier bridge in the rectifier AC load is turned on, the voltage output by the inverter will be instantly clamped by the capacitor voltage, resulting in a voltage of the inverter output Distortion, traditional PI control is difficult to suppress periodic voltage distortion

Method used

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  • Control method, system, electronic device and storage medium of single-phase off-grid inverter
  • Control method, system, electronic device and storage medium of single-phase off-grid inverter
  • Control method, system, electronic device and storage medium of single-phase off-grid inverter

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Embodiment 1

[0098] figure 1 The flow chart of the hybrid control method of the single-phase off-grid inverter provided by the present invention, figure 2 It is a structural block diagram of the hybrid control system of the single-phase off-grid inverter provided by the present invention. like figure 1 and figure 2 As shown, this embodiment provides a hybrid control method and system for a single-phase off-grid inverter. It should be noted that the control method for a single-phase off-grid inverter in this embodiment can be applied to the A control system for a single-phase off-grid inverter, the control system for a single-phase off-grid inverter can be configured on an electronic device. The electronic device may be a personal computer, a mobile terminal, etc., and the mobile terminal may be a hardware device with various operating systems, such as a mobile phone and a tablet computer.

[0099] like figure 2As shown, the hybrid control system of the single-phase off-grid inverte...

Embodiment 2

[0160] Figure 8 It is a schematic diagram of the voltage outer loop control module 73 and the current inner loop control module 74 provided in this embodiment. combine figure 2 and Figure 8 , the difference from Embodiment 1 is that in this embodiment, the current reference limiting unit 734 may only use the first predetermined amplitude limit to limit the amplitude of the basic reference current signal Iref' to generate the reference current signal Iref. The second subtractor 741 makes a difference between the current sampling signal Iout and the reference current signal Iref to generate a current error signal ΔI, and the second R control unit 742 performs resonance adjustment on the current error signal ΔI to generate a current error signal ΔI. The first basic duty cycle information PWM1'. The first duty cycle limiting unit 743 may use the first weight factor W1 and the second predetermined amplitude limit value to perform amplitude limitation on the first duty cycle in...

Embodiment 3

[0162] Figure 9 This is a schematic diagram of the control system of the single-phase off-grid inverter provided in this embodiment. like Figure 9 As shown, the difference from Embodiment 1 and Embodiment 2 is that, in this embodiment, the voltage / current loop control mode is a voltage single-loop control mode. The inverter control module in the control system of the single-phase off-grid inverter includes a voltage single-loop control module 79 , an intelligent iterative control module 75 and a voltage feedforward control module 76 .

[0163] When the first duty cycle information PWM1 is calculated by using the voltage single-loop control method and the first weighting factor W1, the voltage error signal ΔV is obtained by making the difference between the voltage sampling signal Vout and the reference voltage signal Vref, Then perform R control on the voltage error signal ΔV to obtain the first basic duty cycle information PWM1', and then use the first weight factor W1 an...

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Abstract

The present invention provides a single-phase off-grid inverter control method, system, electronic equipment, and storage medium. The impedance characteristics of the identified AC load are used to assign weight factors to at least two inverter control methods, so that the inverter can be used Each inverter control mode and its corresponding weight factors are used to calculate the duty cycle information, and the actual duty cycle information obtained by superimposing all the duty cycle information is used to control the duty cycle of each power switch tube in the single-phase off-grid inverter. The empty ratio signal, the present invention adopts at least two inverter control methods to carry out multivariate hybrid control on single-phase off-grid inverters, and can adjust the weights of the three inverter control methods online to ensure that under different AC load conditions The waveform quality of the output voltage and the stability of the output voltage.

Description

technical field [0001] The invention relates to the technical field of new energy vehicles, in particular to a control method, system, electronic device and storage medium of a single-phase off-grid inverter. Background technique [0002] As the core component of electric vehicles, on-board chargers undertake the important task of replenishing energy for electric vehicles. At the same time, with the rise and rapid development of V2L (Vehicle to Load, vehicle-to-grid) technology, the off-grid inverter function has gradually become an on-board charger. It is one of the standard functions of the machine, which meets the needs of electric vehicle users to use household appliances outdoors. For the off-grid inverter function, it is usually implemented by a single-phase off-grid inverter at present, but the following problems exist when controlling a single-phase off-grid inverter: [0003] (1) In V2L applications, the types of AC loads such as household appliances are variable, ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02M7/5387H02M1/12H02M1/44B60L1/00
CPCH02M7/53871H02M1/126H02M1/44B60L1/00Y02T10/72
Inventor 王振世李卓强纪晓泳张攀
Owner UNITED AUTOMOTIVE ELECTRONICS SYST
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