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Pulse-width modulation (PWM) inverted power supply system and algorithm based on fuzzy predictive control technology

A control technology and fuzzy prediction technology, applied in the field of PWM inverter power supply system, which can solve the problems of output waveform distortion, unsatisfactory dead zone compensation accuracy, and complicated hardware circuit implementation.

Inactive Publication Date: 2011-09-14
NANCHANG HANGKONG UNIVERSITY
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Problems solved by technology

The current problems are low conversion efficiency and output waveform distortion, etc., which have always troubled many scholars.
For example, the hardware circuit is complicated to implement, the precision of dead zone compensation does not meet the requirements, and the stability or robustness of the algorithm is poor, etc.

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  • Pulse-width modulation (PWM) inverted power supply system and algorithm based on fuzzy predictive control technology
  • Pulse-width modulation (PWM) inverted power supply system and algorithm based on fuzzy predictive control technology
  • Pulse-width modulation (PWM) inverted power supply system and algorithm based on fuzzy predictive control technology

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Embodiment approach

[0052] In the fuzzy control algorithm, the fuzzy module is divided into three parts: fuzzification, fuzzy logic reasoning, and defuzzification. Fuzzification is to transform the precise digital quantity into a fuzzy quantity, after fuzzy reasoning, it is transformed into a precise digital quantity, and applied to the generalized predictive control algorithm. The switching time of the switching tube of the inverter topology circuit is affected by the gate voltage and the collector current, and the dead time control is a nonlinear system, which is regarded as a MISO (dual input single output) system. The input quantity is the gate voltage and the collector current, and the output quantity is the appropriate dead time. Because the input driving signal is in the form of PWM wave, its driving voltage has positive voltage, zero voltage and negative voltage. According to the transfer characteristics of IGBT (Insulated Gate Bipolar Transistor), the collector current rises as the gate...

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Abstract

The invention discloses a pulse-width modulation (PWM) inverted power supply system and a PWM inverted power supply algorithm based on a fuzzy predictive control technology. The input is direct current (DC) voltage, and the input passes through a DC booster circuit, is subjected to ripple wave removal through a filtering circuit and passes through a DC / alternating current (AC) inversion circuit; the output is high-voltage AC, an AC voltage detection feedback circuit, an overcurrent detection feedback circuit, a DC detection feedback circuit, a DC voltage detection feedback circuit and other protection circuits are arranged in the circuit, when overcurrent and overvoltage are detected, a control chip obtains a reasonable dead-zone predictive control scheme through an algorithm according to data which is acquired in real time, the PWM driving pulse waveform is changed, and the working reliability of a switching device is effectively guaranteed; meanwhile, the conversion efficiency of a PWM inverter system is high, and the distortion rate of output waveform is reduced. The invention is applicable to fields of switching power supply inverters, solar inverted power supplies, small wind driven generator inverted power supplies and the like.

Description

technical field [0001] The invention relates to power control technology, which belongs to an energy control system for converting the energy of a DC signal into an AC signal, and in particular to a PWM (Pulse width Modulation, PWM, pulse width modulation) inverter power system and algorithm based on fuzzy predictive control technology. Background technique [0002] The inverter power supply converts the energy input as a DC signal into the energy of an AC signal for the AC load to work. The current problems are low conversion efficiency and output waveform distortion, etc., which have been puzzling many scholars. They improve the output waveform from the perspective of inverter dead zone compensation, but each method has its own shortcomings, the effect is not obvious, and the problem still exists. There are many ways to compensate the dead zone at home and abroad, such as: decoupling control method, fuzzy control method, current predictive control method, disturbance dete...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02M7/42
Inventor 赵珂蔡高超
Owner NANCHANG HANGKONG UNIVERSITY
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