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Novel method of synchronized pulsewidth modulation (PWM) has been disseminated for control of cascaded (dual) inverters of photovoltaic installation with relatively low DC-voltages of two insulated photovoltaic panels, operating under condition of low level of solar irradiance. Control regimes are characterized by overmodulation control modes of two inverters in this case. Algorithms of synchronized...
The paper presents results of investigation of dual-inverter-based power conversion system with synchronized pulsewidth modulation (PWM) for photovoltaic application. This system topology includes two isolated strings of photovoltaic panels, feeding two standard three-phase inverters, connected to grid by a three-phase transformer with the open winding configuration on primary side. Algorithms of...
The paper describes operation of cascaded (modular) converters with synchronous pulsewidth modulation (PWM), mainly for control regimes different from conventional volts/hertz control. Modular multilevel converter consists from three standard three-phase inverter modules along with an 0.33 p.u. output transformer. The proposed PWM method provides synchronisation of the voltage waveforms of each module...
Novel method of direct synchronised pulsewidth modulation is applied for control of a dual inverter-fed open-end winding induction motor drive with separate DC-link sources with different voltages. New strategy and algorithms of synchronised pulsewidth modulation (PWM) provide quarter-wave symmetry of multilevel actual phase voltage of the system during the whole control range including the zone of...
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