Abstract
When multiple distributed converters are integrated, the high frequency harmonics will randomly accumulate at the point of common coupling (PCC). This paper proposes a new fast global synchronous discontinuous pulse width modulation (GSDPWM) method of three-phase inverters to effectively attenuate the high frequency current harmonics at PCC. Firstly, the basic principle and the realization method of GSDPWM for three-phase inverters are explained, which can be employed for different modulation types. Then a fast calculation method, which can equally derive the minimized total harmonic distortion (THD) of total current, is proposed to release the calculation burden. Finally, MATLAB simulations and experimental results are presented to verify the performance of GSDPWM.
Highlights
Distributed inverters have been widely implemented in many applications, such as photovoltaic (PV) plant, wind plant and microgrid, to connect distributed sources to the power grid [1,2,3,4,5], where distributed inverters are generally controlled by pulse width modulation (PWM) methods
Reference [19] proposed the global synchronous pulse width modulation (GSPWM) method, where global synchronous unit (GSU) was employed to realize the basic functions of GSPWM and the high frequency harmonics can be eliminated at point of common coupling (PCC)
MATLAB/Simulink is used to verify the performance of global synchronous discontinuous pulse width modulation (GSDPWM) for three-phase inverters
Summary
Distributed inverters have been widely implemented in many applications, such as photovoltaic (PV) plant, wind plant and microgrid, to connect distributed sources to the power grid [1,2,3,4,5], where distributed inverters are generally controlled by pulse width modulation (PWM) methods. Active or passive damping method can be employed to eliminate the resonance peak. These methods will increase the complexity of the control system. Reference [19] proposed the global synchronous pulse width modulation (GSPWM) method, where global synchronous unit (GSU) was employed to realize the basic functions of GSPWM and the high frequency harmonics can be eliminated at PCC. This paper proposes a new method to fast calculate the high frequency harmonics of three-phase inverters when the modulation waveforms are discontinuous. A new processing method to fast calculate the important optimal phase shift angles and the frequency of sending synchronization signals is introduced. MATLAB simulations and experimental results verify the performance of the proposed method
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