Abstract
The high frequency isolated quasi Z-source inverter is a new type of inverter, which is suitable for photovoltaic generation system because of its high lift to voltage ratio, transient bridge direct access and electrical isolation.With the increase of its power density, the working frequency of its semiconductor switching devices is increasing. Switching devices in high-frequency states generate a large amount of electromagnetic noise, affecting the normal operation of surrounding electrical equipment and threatening the stability of the power grid. For the optimization of electromagnetic compatibility of high frequency isolation quasi Z-source inverter, using pulse width modulation (PWM) chaotic modulation technology, put forward using Chen multi-scroll chaotic system and traditional PWM are combined, using the new PWM control technology can inhibit electromagnetic interference (EMI) from the noise source, effectively reduce the high frequency isolation quasi Z-source switch frequency and its harmonics noise power, and optimize the total harmonic distortion (THD) of the output current by analyzing the chaotic modulation coefficient. Finally, the correctness of the theory is verified by Saber simulation and circuit test. This paper can provide guidelines for the electro magnetic compatibility (EMC) design of the high frequency isolated quasi Z-source inverter and provide the theoretical basis for the EMI optimization design of the power electronic system.
Highlights
Nowadays, diminishing fossil energy and environmental pollution stimulate the utilization of renewable energy, such as solar energy and wind energy
Mode of high frequency switch has been proposed, which can reduce the peak of switching noise and improve the electromagnetic compatibility (EMC) of the switching circuit [1]–[3]
Chen system multi-scroll chaos x time domain waveform step more, the waveform change is more complicated in the same period of time, its complexity is applied to the high frequency isolated quasi Z-source inverter, electromagnetic interference (EMI) suppression effect is better
Summary
Nowadays, diminishing fossil energy and environmental pollution stimulate the utilization of renewable energy, such as solar energy and wind energy. The spectrums of these signals are not uniform, which cannot suppress the fixed frequency noise generated by the high-frequency switch. The recent researches show that the chaotic spread spectrum technology could effectively reduce the peak value of the circuit noise by extending the switching frequency width [7]–[10]. Y. Chen et al.: EMI Suppression of High-Frequency Isolated Quasi Z-Source Inverter by Chua’s circuit is relatively simple and its spectrum distribution is still not uniform enough for the fixed frequency noise [11]. The upper and lower bridge arms could be switched at the same time, and has the characteristics of electrical isolation, high rise to voltage ratio, and low voltage and current stress It is widely used in photovoltaic power generation systems.
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