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Modulation method of Semi-Z-source single-phase inverter

A single-phase inverter and modulation method technology, applied in the field of power electronics, can solve the problems of small output capacitance and low output AC frequency.

Active Publication Date: 2018-11-13
XIAN UNIV OF TECH +1
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Problems solved by technology

[0004] The purpose of the present invention is to provide a modulation method of a Semi-Z source single-phase inverter, which solves the problem that the SPWM modulation method of the existing Semi-Z source single-phase inverter is only suitable for small output capacitance, light load, The problem of low output AC frequency

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[0147] Such as Figure 4 shown, when V in =200V, M=0.75, I o =10A, f=50Hz, C 1 =5000uF, L 1 Using the approximate waveform of the capacitor voltage at different inductance values, it can be seen that when the inductance value is the smallest and the current ripple is the largest, the a in the capacitor voltage waveform 1 The sine term is the main AC component. As the current ripple decreases, the capacitor voltage ripple decreases significantly and no longer tends to the sine waveform. Therefore, under this new modulation method, suppressing the current ripple has a significant effect on reducing the demand for the capacitance value. important role.

[0148] at V in =100V, I o =20A, f=50Hz working conditions, substituting into formula 18, in order to meet the ripple requirement, the required inductance value reaches 130mH, which is obviously not ideal in practical applications. However, for the application of f=800Hz, the demand for inductance is greatly reduced to about ...

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Abstract

The invention discloses a modulation method of a Semi-Z-source single-phase inverter. The modulation method includes: building the linear modulation algorithm of Semi-Z-source single-phase inverter circuit topology; according to modulation algorithm requirements, determining the voltage value of a capacitor in the Semi-Z-source single-phase inverter circuit topology, and determining the relation between inductor current ripples and capacitor current ripples; solving the required inductance of the inductor according to the relation; substituting the voltage value of the capacitor and the required inductance into the built modulation algorithm, and solving the duty ratio of a switch, and determining the on and off states of the switch according to the duty ratio. The modulation method has the advantages that the limitation that an original method is only applicable to small-power occasions and low in output frequency is broken through, the inverter topology is allowed to have the abilityof driving heavy loads and outputting medium-frequency alternating currents, the voltage stress of the switch device is lowered, control signal and output linearization is achieved, and controller design is facilitated.

Description

technical field [0001] The invention belongs to the technical field of power electronics and relates to a modulation method for a Semi-Z source single-phase inverter. Background technique [0002] The upper and lower power switches of the same bridge arm of the voltage source inverter cannot be turned on at the same time, otherwise it will cause a short circuit and damage the inverter. Therefore, it is necessary to add a dead time between the switching signals of the upper and lower bridge arms, but the dead time The addition of time will cause distortion of the output waveform. On the other hand, the output voltage of the inverter is lower than the DC input voltage. When the input voltage is low or has a large variation range, it is necessary to add a step-up converter in the front stage, resulting in a complex overall system structure and low efficiency. . The Z-source inverter can overcome the above-mentioned shortcomings of the voltage source inverter, and provides a n...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02M7/48
CPCH02M7/48
Inventor 李宁张岩聂程
Owner XIAN UNIV OF TECH
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