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Virtual Synchronous Generator (VSG) is an inverter control structure that supports power system stability by imitating a synchronous machine. Because of the limitation in inverter power and current, their operation under disturbances should be evaluated and enhanced. In this paper, the VSG unit response to different types of faults at grid side is assessed. Besides, a theoretical analysis that traces...
The Dynamic Voltage Restorer (DVR) is a solution for protection of sensitive loads from voltage sags and swells. Its basic function is to inject voltages in the grid line in order to mitigate voltage sags and/or swells. Typically the controller structure for a DVR is composed by an inner current loop and an outer voltage loop. Usually a proportional or proportional integral controller is used for...
An LDMOS (lateral-diffused MOS) is often used to as the ESD device in a high-voltage circuit for its low on-resistance benefit. But, it has several serious disadvantages, including the Vh value is not high enough and the device in a multi-finger structure can't completely turn on which resulting in the ESD capability per unit length is very low. So, the non-uniform turned-on phenomenon is seriously...
This paper overviews the recent technical trends in permanent magnet synchronous motors (PMSMs), especially the rare-earth less PMSMs in Japan. The rareearth less PMSMs including the PMSMs with reduced rareearth PMs, permanent magnet assisted synchronous motors with ferrite magnets and axial gap PMSMs with ferrite magnets are reviewed.
In digitally controlled circuits for power converter circuits, sampling data is important because a digital control circuit is operated on the basis of these data. If the sampled values have been affected by switching noise from the power circuit, the control stability of the circuit would be disturbed. This paper proposes a noiseless sampling method for both synchronous sampling and multisampling,...
In this paper the problem of effective current control in Switched Reluctance Machine (SRM) drives is addressed. A sliding mode pulse width modulator (SMPWM) is introduced to govern the inherently highly nonlinear system dynamics. The proposed SRM drive is analyzed theoretically and subsequently validated through simulation. Satisfactory dynamic performance and precise speed control with reduced torque...
The sensorless vector control method in induction motor drives is utilized more and more popular in industry applications. The traditional current loop controller is PI regulator but its bandwidth is limited by switching frequency. In this paper a predictive current controller is proposed to solve the limitation of bandwidth in sensorless vector control system. The stability condition of proposed...
An new network communication system for power electronics controller to transmit the feedback signal from the sensors using FPGA based hardware controller was proposed. Based on RocketI/O network controller, customized Rocket I/O protocol was implemented to achieve high speed feedback communication between two FPGA controller. To compensate the network delay of the feedback signal, communication disturbance...
This paper proposes new practical design tools for the robust motion control systems based on disturbance observer (DOB). Although DOB has long been used in several motion control applications, it has insufficient analysis and design tools. The paper proposes a new practical robustness constraint, which improve the robustness at high frequencies, on the bandwidth of a DOB and nominal inertia. Although...
This paper presents a robust sensorless startup control method with self-commissioning for permanent magnet motors for smooth ramping speed up without reversing oscillations. Low cost sinusoidal PMSM motors used for fan and blower applications may have large parameter variations and static friction uncertainties. A reliable startup control with smooth operation thus becomes an indispensable requirement...
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