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In series-connected H-bridge multilevel inverters, the voltage level of each phase is supplied independently by a complicated transformer. The energy flowing back via the free-wheeling diodes may, hence, not be transferred to another phase. Therefore, the DC link voltages in multilevel inverters fluctuate under load, and cannot be considered constant. Voltage fluctuation causes several problems including...
Capacitor voltage oriented PI control is implemented to control the phase voltage of a customer-end single-phase inverter in a low-voltage DC (LVDC) distribution system. Synchronous dq-frame is used to control the phase voltage to avoid the drawbacks of the PI control, such as possible steady-state error. In the paper the controller equations are derived from the system equations and then the controllers...
Linear quadratic Gaussian (LQG) based phase voltage control is implemented. The regulation performance, estimation accuracy and interference sensitivity of different LQG control schemes is evaluated and compared. Paper reveals that it is possible to make the control system more insensitive to EMI when compared to dual-loop PI control and that the synchronous co-ordinate control scheme's all-around...
Switching pattern in multilevel inverters has to be restricted to single voltage level steps to limit the overvoltages caused by the cable reflections and du/dt. This restriction affects not only the single-phase voltage pattern but the maximum allowed change of a voltage reference vector in three-phase operation and as a result also the maximum achievable frequency of the reference. These together...
Proportional-integration (PI) controller scheme is implemented to control the phase voltage of the customer-end single-phase inverter in a low-voltage DC (LVDC) distribution system. In the inverter output, the LC-filter is used. In order to avoid resonances caused by the filter, the feedback and the feedforward filteration is used. It is shown that basic PI control system cannot drive the steady-state...
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