Three-phase current tracking type inverter control method based on fuzzy PI control

A three-phase current and control method technology, applied in the direction of converting AC power input to DC power output, electrical components, output power conversion devices, etc., can solve the problem of not being able to control the output current well, and achieve strong anti-interference ability. , increase the accuracy, the effect of strong robustness

Inactive Publication Date: 2021-06-22
FUZHOU UNIV
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Problems solved by technology

However, the parameters of the PI controller of the current tracking inverter have been set before, and the three-phase current tracking inverter has time-varying and nonlinear characteristics, so the traditional PI controller cannot control the output current well. Make the output current have a greater total harmonic distortion rate, and the output current has more harmonics

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  • Three-phase current tracking type inverter control method based on fuzzy PI control
  • Three-phase current tracking type inverter control method based on fuzzy PI control
  • Three-phase current tracking type inverter control method based on fuzzy PI control

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Embodiment Construction

[0051] The present invention will be further described below in conjunction with the accompanying drawings and embodiments.

[0052] Such as figure 2 As shown, this embodiment provides a three-phase current tracking inverter. The three-phase current tracking inverter is mainly composed of a DC power supply, three switching tube bridge arms and a three-phase resistive load. There is an IGBT switch tube at the top and bottom of each arm, and the DC power supply is connected to both sides of the bridge arm. The three-phase resistive load is connected between the upper and lower switch tubes of the three bridge arms. The negative input terminal of the bridge arm is defined as N, and the three-phase resistive load The connection point is n, and the current sensor is connected to the three-phase resistive load side, and the PWM output is respectively connected to the gate of the corresponding IGBT switch tube to provide the control signal required to control the switch tube.

[00...

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Abstract

The invention relates to a three-phase current tracking type inverter control method based on fuzzy PI control, and the method comprises the steps of obtaining a load side current of a three-phase inverter through a current sensor, obtaining the difference of the load side current and a given tracking current, carrying out fuzzification processing on a difference value and a difference value change rate, and carrying out fuzzy setting, fuzzy reasoning and defuzzification so as to realize the real-time adjustment of the parameters of a PI controller; and comparing the output of the fuzzy PI controller with a triangular wave to generate a required PWM waveform, so that the three-phase inverter is controlled. According to the method, the fuzzy control and the PI control are utilized, the proportion and integral coefficients can be adjusted in real time, the problem that the parameters of a traditional PI controller are fixed is solved, and the robustness, adaptability and anti-jamming capability of the three-phase current tracking type inverter can be improved.

Description

technical field [0001] The invention belongs to the technical field of inverter control, and in particular relates to a control method for a three-phase current tracking inverter based on fuzzy control and PI control. Background technique [0002] The traditional PI controller only needs to set the proportional and integral coefficients, which is easy to use and has good control effect. Therefore, PI controllers are widely used in various control systems. However, due to the difficulty in selecting the proportional and integral parameters of the PI controller, there will be problems such as slow speed, inability to change parameters, and inaccurateness by relying on trial and error by experts. Therefore, it is urgent to find a better method to complete the selection of PI parameters. At present, the methods to solve the selection of PI parameters include theoretical calculation method, critical ratio method, response curve method and decay method. Among them, the parameter...

Claims

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Application Information

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IPC IPC(8): H02M7/5387H02M1/12H02M1/44
CPCH02M7/53871H02M1/12
Inventor金涛宋慧庆张钟艺李泽文
OwnerFUZHOU UNIV