| With the rapid development of modern power electronics, power inverter is more and more widely used in people’s lives,.Besides, natural gas, oil and coal are increasingly tense today, environmental protection and energy saving has become a advocacy theme for human, the utilization on solar energy, wind energy, tidal energy and other green energy has entered a rapid development stage.Nowadays, businesses in many new electrical equipment for power supply request higher requirements, the AC power supplied from the AC has been unable to meet production needs.Initially,most of the power inverter was used in the simulation, single-loop feedback control strategy, although it has simple circuit structure, but its dynamic response and steady-state performance are difficult to achieve the desired results, when the input voltage has fluctuations or load mutations, it will cause the output voltage instability.Ordinary power inverter, just needs the output voltage and frequency adjustable is feasible. But with the improvement of the industrial equipment, it needs high quality power, high-performance inverter must meet the following points:(1) high input power factor and low output impedance; (2) fast dynamic response and high steady-state performance; (3) high reliability, high efficiency; (4) more digital, intelligent, network-based, apparently, to achieve high-performance inverter digital control technology are inseparable.The emergence of digital DSP control chip, with a high-speed real-time processing capabilities, which greatly increases the internal integration of the diversity of the algorithm ability to achieve,this article takes TMS320F2812 control with single-phase sine wave inverter as a study. Aimed at inverter load or load waveform distortion with non-linear, building the simulation model of the single-phase full-bridge inverter control, because inverter output waveform distortion are repetitive, and repetitive control can be a good suppress periodic disturbance, improving system stability. Proposed the adopt of voltage and current double closed-loop feedback control scheme and a combination of repetitive control, in order to improve the dynamic response and steady state accuracy of the system, and to establish its control system simulation model simulation research in MATLAB simulation platform.With the increase in the type of power equipment, harmonic pollution become more serious, power correction technology has gradually got people’s attention,When the AC power input, Voltage is a sine wave AC voltage, However, since only when the input voltage is higher than the voltage rectifier output filter capacitor, current flows through the circuit only, the input current is not a standard sine wave, commonly used method is adding PFC module in the power circuit to improve its factor.In recent years, there are many types of modern inverters:according to output by the number of phases, can be divided into single-phase inverter, three-phase inverter and multipurpose inverter; according to press waveform output voltage or current, can be divided into the inverse sine wave output variable and non-sinusoidal output inverter, UPS inverter power inverter as an important member of the modern, it can provide safe, reliable power for the user equipment. Meanwhile, UPS power supply can also be effective on the grid voltage fluctuations, harmonic interference, surge voltage waveform distortion and play an inhibitory effect, so as to better protect the load device.In this article,takes DSP as the core of the UPS inverter control for specific object of study, and design the hardware circuit, including hardware PFC circuit, a voltage detection circuit, and each module power supply circuits, etc.Finally, on the basis of the hardware,For system simulation and software flow is given in accordance with the functional requirements of each module and associated test waveforms. |
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