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In this paper, an enhanced control strategy of the smooth transition between the grid-tied and stand-alone operation modes of the distributed generation (DG) inverter is proposed. In the grid-connected mode, the DG inverter controls active and reactive powers flowing into the grid by regulating grid currents using typical proportional integral plus resonant (PI+R) controllers, while direct voltage...
This paper proposes a novel topology of submodule (SM) for the modular multilevel converters (MMC) applying to the high-voltage DC (HVDC) transmission systems, where the DC-fault current due to the freewheeling effect of the diode rectifier is blocked during a short-circuit fault in the DC cables. An additional insulated-gate bipolar translator (IGBT) with a low voltage rating is required to be connected...
This paper proposes a condition monitoring scheme of submodule (SM) capacitors in the modular multilevel converters (MMC), which is based on the capacitance estimation using the information of the current and voltage ripples of the capacitors. In order to induce the voltage ripple in the capacitor, a controlled AC current is injected into the circulating current loop through the action of the average...
This paper proposes a novel control strategy of the three-phase four-wire dynamic voltage restorers (DVR) under the grid voltage unbalance and nonlinear loads in the distribution system, where a feedback linearization technique is applied. By the input-output feedback linearization for the nonlinear model of DVR with the PWM voltage source inverter (VSI) and the LC filters, the system is linearized...
In this paper, a novel scheme for the estimation of the equivalent series resistance (ESR) of the dc-link electrolytic capacitor in three-phase ac/dc pulsewidth-modulation converters is proposed for condition monitoring. First, a controlled ac current component is injected into the input. Then, it induces ac voltage ripples on the dc output. By manipulating these ac voltage and current components...
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