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In this paper, a new control structure is proposed for grid-tied photovoltaic (PV) systems where the dc bus voltage is regulated by the dc/dc converter controller, whereas the maximum power point tracking (MPPT) function and the power flow control are embedded into the dc/ac converter controller. A PV voltage-regulation is designed to build the linkage between MPPT function and power flow control...
ECPT is a novel technology which utilizes capacitive coupling to realize wireless energy transfer. But, it is well known that ECPT system is very sensitive to parameters variation. In order to improve system robustness, a novel quasi sliding mode control method is proposed. A GSSA model is building up and a quasi sliding mode variable structure control strategy is proposed accordingly. Finally, the...
This paper presents a novel decoupled current-control method for induction motor (IM) based on higher order sliding mode (HOSM) controller. In the proposed scheme, the decoupled control of d - q currents does not require the knowledge of the speed. The HOSM controllers play the same role as the compensation voltages produced by a decoupling compensator. Based on this observation, the speed is estimated...
A robust field weakening method for direct torque controlled PMSM drive system was proposed. The basic idea is to adjust the flux reference on the basis of voltage error, which changes with variable states of motor. Furthermore, a unified method of determining flux reference in the whole operating range is given. In the end, this robust field weakening method was validated by simulation and experiment,...
This paper proposes multivariable robust control for a gait trainer for people with walking disability. The gait trainer composes of linkages and motors, which drive the linkages to produce preferred gait traces. To simplify the traditional motor control, the tracking error and motor current are feedback for control design to regulate the motor voltage. First, the transfer function matrices of the...
A novel direct torque control strategy, using genetic algorithm on-line to optimize the fuzzy PI controller, is proposed. In this approach, according to speed error and its first time derivative, the proportional coefficient Kp and integral coefficient Ki can be on-line adjusted by fuzzy adaptive PI speed regulation, and the fuzzy logic adapter parameters are optimized by genetic algorithm to improve...
This paper concerns the control design of multi-sources renewable energy systems. Dynamic equations describing the coupling of buck converters are derived and a robust sliding mode dynamic controller is designed. The aim is to show that the proposed control gives good results in terms of robustness and stability according to the fluctuations of renewable sources and the load variations, without the...
The paper presents a detailed study on the idle leakage reduction techniques on partially depleted silicon-on-insulator (PD-SOI) CMOS SRAM. The most promising leakage reduction techniques that have been proposed are introduced, analyzed and compared into 65 nm low-power PD-SOI technology, taking into account all the SOI specific effect. Especially, it is shown that the leakage reduction techniques...
Since the very beginning of the flash memory era, the market has been dominated by the floating gate technology. However, as floating gate flash continues along a very steep scaling path, more and more barriers start to appear, limiting further scaling possibilities of the technology. At the same time, other concepts are preparing to take over. This paper concentrates on the prospect of high-k materials...
Novel 3D stacked gate-all-around multichannel CMOS architectures were developed to propose low leakage solutions and new design opportunities for sub-32 nm nodes. Those architectures offer specific advantages compared to other planar or non planar CMOS devices. In particular, ultra-low IOFF (< 20 pA/mum) and high ION (> 2.2 mA/mum) were demonstrated. Moreover, those transistors do not suffer...
This paper presents an improved stator flux orientated (SFO) control strategy of induction motors. Based on coordinate transformation and stator flux orientation, a mathematical model of induction motor is derived. In this new system, the stator flux linkage is directly controlled by the d-axis component of stator voltage and in the speed control channel, the output of current controller is regarded...
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