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A novel modulation technique for single phase grid-tied inverter is proposed in this paper. In normal discontinuous current mode (DCM) operation, the output current becomes distorted due to the resonant between parasitic output capacitors of switching devices and inductor during zero current periods if no current control method is applied. This low frequency distortion can be improved in the boundary...
This paper proposes a control structure of SST (Solid-state-transformer), which consists of MMC (Modular Multi-level Converter) based AC/DC converters and isolated DC/DC converters, to reduce the size of capacitors. The phase separated configuration requires a high capacitance needed for smoothing capacitors due to instantaneous power oscillation at the double line frequency. This paper proposes an...
This paper discusses the control strategy of DC-capacitor voltage in single-phase STATCOM with drastically reduced capacitance. Reduced capacitance results in a high amplitude of the capacitor voltage oscillation; therefore, the peak voltage control is important to keep the dimensional size of the capacitor compact. A good dynamic peak voltage estimation method has been proposed for the control. This...
This paper presents the capacitor size reduction of a MMC-based transformer-less STATCOM for medium voltage ac distribution system. The instantaneous power swinging flows into the single-phase configuration results in a high capacitance needed; however, by accepting the swinging voltage in the capacitor, the capacitance can be drastically reduced. This paper analyzes the dimensional size reduction...
This paper proposes capacitance reduction in modular multilevel converter (MMC) based static synchronous compensator (STATCOM). The MMC-based STATCOM consists of several series connected single-phase STATCOM; therefore, the required capacitance to achieve a constant dc voltage is comparatively high. The basic concept of the capacitance reduction and control principle have been proposed in single-stage...
This paper discusses the design and control of a single-phase STATCOM with reduced dc capacitance. It is first demonstrated how operation with reduced dc capacitance and large dc voltage oscillations can be possible without increasing the maximum dc voltage, as long as only operation for reactive power injection is required. Then, a method for dc peak voltage control is proposed, based on adaptive...
Permanent magnet synchronous generator (PMSG) is attractive as a power source for mobility due to its high power density and low maintenance needed. However, increase of the generator current results in the voltage drop due to the synchronous reactance. That means the generator capability including rated voltage cannot be sufficiently used in whole operating range without reactive power control. This...
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