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This paper presents a modified DTC-PWM scheme which uses 12-side sectors and 12 voltage vectors to reduce torque and flux ripple. In the proposed control scheme, three voltage vectors can be selected in a sector with the torque and flux error conditions. The 3 voltage vectors are set as big-small, medium-medium and small-big pairs of torque and flux component according to the sign of the torque and...
This paper proposes a new type of Modular Multilevel Converter (MMC) applying a three winding transformer. In general, MMC requires a buffer reactor in each arm, which increases number of components and converter footprint. The proposed MMC with three winding transformer does not require the buffer reactors. We describe mathematical properties of the proposed MMC. We also confirmed it operated as...
Large energy-saving effect can be expected for air conditioners that occupy the highest power consumption rate of home appliance, by introducing the SiC. In this paper, the transition of power devices, the characteristics, and the issues in widespread use, and foresight of the next generation power devices, SiC, are reported.
This paper presents an average power balancing control technique for the modular multilevel cascaded converter (MMCC) based on single-star bridge cells (SSBC) in the static synchronous compensator (STATCOM) applications. Detailed power flow analyses of the MMCC-SSBC converter, from the bottoem level of individual H-bridge modules, then the middle level of per-phase circuit, to the top level of the...
We have proposed the Virtual Synchronous Generator control (VSG control) and have tested it using the demonstration equipment [1]. By using the VSG control, three-phase inverters of current control type are able to run both in grid-connecting operation and in grid-disconnecting operation. Furthermore, in order to control a single-phase inverter like a three-phase inverter using the VSG control, we...
This paper deals with an amplitude adjusting method for a signal injection in position sensorless controls of IPMSM (Interior Permanent Magnet Synchronous Motor) drives. Signal injection is necessary for position estimation at standstill and low speeds. Response signals to the injected signals have position information caused by a saliency of the IPMSMs. The position information appears in inductances...
The low-voltage ride-through (LVRT) capability has become one of the most important issues since more renewable and distributed energy resource are installed in the grid. The LVRT capability means the converter should remain grid-connected and inject required current to support gird voltage. On the other hand, the sudden reduction of grid voltage may result in magnetic flux deviation in the step-up...
A control strategy for direct-drive PMSG wind generation system based on three phase current source converter (CSC-DPMSG-WGS) is presented in this paper. By the proposed method, once unbalanced grid voltage fault happens, the generator-side converter limits the power which flows to DC-link rapidly, meanwhile the grid-side converter controls the positive and negative sequence currents respectively...
Model Predictive Control (MPC) offers a variety of advantages compared to conventional control methods. The problem with MPC is the high computational cost and the associated long control cycle time. This makes MPC unattractive for processes with small time constants, as in permanent magnet synchronous motors with interior magnets (IPMSM) for electric vehicles. In this paper a Model Predictive Control...
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