Fuzzy PID control method of inverter power supply

Abstract

The invention discloses a fuzzy PID control method of an inverter power supply, relates to the field of new energy grid-connected power generation for smart grids, and is mainly applied to the inverter power supply. According to the control method, a fuzzy PID control algorithm is adopted, a DSP (digital signal processor) controller serves as the core, a high-frequency inverter, a high-frequency transformer, a full-bridge active rectification module, an active clamping block, a low-frequency inverter, an output filter module and other modules are controlled by calling the fuzzy PID control algorithm and according to a corrected SPWM control signal and a 50 Hz pulse signal, and expected 220 V / 50 Hz sine alternating current is obtained. The control method is simple in structure, reliable in work, high in efficiency and widely applicable to the new energy grid-connected power generation field.

Description

technical field [0001] The invention belongs to the field of smart grid new energy grid-connected power generation, and specifically relates to a fuzzy PID control method for an inverter power supply, which is mainly used in the aspect of the inverter power supply. Background technique [0002] The traditional inverter technology generally adds a power frequency transformer between the inverter power supply and the output terminal to achieve electrical isolation and voltage adjustment. This implementation method has reliable performance, mature technology, and is widely used, but the power frequency transformer is large in size and High cost and poor dynamic response to input voltage or load fluctuations. On the other hand, from the perspective of control theory, due to the nonlinear load and the non-periodic change of the load, there are fuzzy uncertainties in the parameters and variables of the inverter power supply during operation, and it is difficult to establish an acc...

AI Technical Summary

Problems solved by technology

[0002] The traditional inverter technology generally adds a power frequency transformer between the inverter power supply and the output terminal to achieve electrical isolation and voltage adjustment. This implementation method has reliable performance, mature technology, and is widely used, but the power frequency transformer is large in size and High cost Poor dynamic response to input voltage or load fluctuations

On the other hand, from the perspective of control theory, due to the nonlinear load and the non-periodic change of the load, there are fuzzy uncertainties in the parameters and variables of the inverter power supply during operation, and it is difficult to establish an accurate mathematical model for the control of the system. posed many technical difficulties

Traditional control theory relies too much on the precise mathematical model of the system, and cannot make full use of the professional knowledge and practical experience accumulated by the staff for a long time, which makes the control effect of the traditional inverter power supply control method poor, and its adaptability, robustness and flexibility are poor , it is difficult to achieve the expected control effect

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