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Capacitor bank switching classification using scale selection continuous wavelet transform is an approach to develop power quality diagnostic feature to analyze the origin and possible cause of transient disturbance in the industry facility. The scale selection wavelet transform selectively perform continuous wavelet transform from scale 1 to scale 70 at the dilation interval of one per scale whereby...
This paper presents a real-time voltage sag monitoring system. Discrete wavelet transform (DWT) is implemented by using an embedded chipset in order to monitor initial and ending points of voltage sag. A flywheel energy storage system (FESS) is designed for voltage sag compensation, and proof-of-principle experiment is presented.
This paper presents an integrated DC-DC buck converter using the synthetic ripple hysteresis control scheme with a fast transient path to define the boundary of hysteresis band. The hysteresis band and switching frequency depend on load current changes; therefore, it accelerates regulation and reduces overshoot. Full chip simulation results indicated output voltage recovery time is shortened within...
This paper proposes an adaptive backstepping controller design for a position control system of permanent-magnet synchronous motors. The proposed system has been successfully used in a knitting machine with satisfactory performance, including fast transient responses, good steady-state responses, and good tracking ability. Based on properly selecting a Lyapunov function, an adaptive backstepping position...
Because of the renewable energy generation (for example wind and photovoltaic) becomes a new research hotspot, people pays more attention to the problem of power fluctuation of wind/PV (photovoltaic) generation as the wind velocity and solar insolation intensity are intermittent and unpredictable. To solve the problem, this paper introduced superconducting magnetic energy storage (SMES). Compared...
This paper presents a new scalar-controlled double-stator permanent magnet brushless (DS-PMBL) motor. Because of the special phase decoupling structure, scalar control strategy is newly incorporated into the time-stepping finite element method (TS-FEM) to analyze the transient performance of machine. The complicated coordinate transformation is avoided and constant torque and flux weakening control...
The Brushless Doubly-Fed Induction Generator (BDFIG) shows commercial promise as replacement for doubly-fed slip-ring generators for wind power applications by offering reduced capital and operational costs due to its brushless operation. In order to facilitate its commercial deployment, the capabilities of the BDFIG system to comply with grid code requirements have to be assessed. This paper, for...
This paper presents a constant frequency hysteretic PWM controlled buck converter. In order to have good transient responses for input voltage and load current changes, a new PWM control method with inherent derivative characteristics is proposed. The proposed PWM controller consists of a comparator, a simple RC network and operational amplifier, and it can be synchronized with an external clock signal...
This paper presents a new control method for H-bridge buck-boost converter regulated by single voltage feedback and dual feedforward controls. This converter has two pairs of the switch, one acts as a synchronous buck and another as a synchronous boost operations, and therefore is suited for battery powered applications to provide an output voltage that is below or above the input voltage. In order...
In this paper a fuzzy controller is designed for a recently developed voltage-boosting converter, named KY converter. The fuzzy controller neatly controls the switches of a 2nd-order KY converter via pulse-width-modulation (PWM) technology, which yields the voltage conversion ratio 2-plus-D where D represents the duty cycle. Experimental results show that the design simultaneously achieves faster...
This paper deals with analysis and reduction of dc-voltage fluctuations in a single-phase active power filter caused by a sudden load change. The analysis reveals that the delay time of the harmonic detection causes dc-voltage fluctuations in transient states. A new control method is proposed to reduce the dc-voltage fluctuations, based on the analysis. As a result, the dc capacitor can be reduced...
This paper proposes a novel UPFC damping control scheme using fuzzy controllers working on local signals. The design of controller is based on the time-domain analysis of the system transient energy function (TEF) and implemented by using fuzzy controllers to damp low frequency electromechanical power oscillations. The detailed design procedure of fuzzy based damping controllers is firstly addressed...
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