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IPMSM have attracted attention for its high efficiency. Extended electro motive force (EMF) based sensorless vector control system is one of the representative methods. In this paper, we propose a simplified sensorless vector control system without using an observer on the basis of the extended EMF. In order to verify the effectiveness of the proposed system, we perform stability analysis and comparison...
The Modular Multilevel Converter (MMC) with cascaded full bridge cells enables the multi-level output and has the big merit that the system is not required the transformers when it is used as a distributed power supply in high voltage system. The control method of the MMC for single phase AC-AC conversion system investigated in this study. The full bridge type MMC, which is expanded from the half-bridge...
From the viewpoint of miniaturization and cost reduction, sensor-less vector control systems without using an encoder have been proposed in many papers. We proposed a simplified method which estimates the rotor position using the d-axis voltage without using observer and controls motor speed using the d-axis voltage too. In order to verify the effectiveness of the proposed method, we have performed...
The modular multilevel converter (MMC) with cascaded full bridge cells is available for an AC/AC transmission system without transformers in high voltage line. When it is interconnected with power line, it is possible to control the active power flow in order to supply the power to the power line. This research applied the MMC to grid connection system of distributed generator for single phase AC/AC...
The modular multilevel converter (MMC) with cascaded full bridge cells is available for a utility interactive inverter and AC/AC transmission system without transformers in high voltage line. When it is interconnected with power line, it is possible to control the active power flow in order to supply or charge the power in the line. This research applied a Hexagonal type MMC (H-MMC) to 3-phase AC-AC...
Distributed generation is violent fluctuations because it depends on output of the clean energy generation system. Thus a power leveling system (PLS) is applied to maintain a balance between power supply and such an irregular power generation. The PLS is required to operate charge or discharge of storage and bidirectional power flow. Thus the PLS consists of a bidirectional buck/boost DC/DC converter...
Renewable energy system such as a photovoltaic, a wind turbine generation and fuel cell has attracted attention as alternative energy sources of fossil fuel. However, a distributed generating system with the photovoltaic or the wind turbine generation is difficult to obtain a constant power supply. Thus control of power leveling system is required to maintain the balance of power flow for irregular...
Sensorless vector control of an interior permanent magnet synchronous motor (IPMSM) has been studied in many papers. The extended electromotive force (EMF) based method is one of the representative systems. We proposed a simplified method which estimates the rotor position using the controlled voltage without using observer. In this paper we have compared these methods through trajectories of poles...
The Modular Multilevel Converter (MMC) with cascaded full bridge cells is available for AC/AC transmission system without transformers in high voltage line. This research applied a Hexagonal MMC (H-MMC) to 3-phase AC-AC back-to-back (BTB) system. The H-MMC has six arm modules with floating capacitors and is required to regulate the input-output power and capacitor voltages by controlling currents...
This paper presents steady-state and transient characteristics of a high-performance V/ƒ control method for induction motors, which is based on the vector control theory. A linear model is derived for analyzing the system stability and the influence of low pass filter is discussed. The effectiveness of proposed method and validity of the analysis have been demonstrated by simulation and experiments.
This paper presents a new simplified V/f control system of induction motor (IM) for precise speed operation, which is based on the vector control theory. A linear model is derived for analyzing the system stability, including the influences of motor operating states in motoring and regenerating operations, and parameter variation of low pass filter. A stator resistance identification is proposed by...
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