Recent Advances in Electrical & Electronic Engineering - Volume 7, Issue 2, 2014

The traditional artificial potential field algorithm has the shortcomings of appearing trap area easily and shaking in front of obstacles. This paper, studying traditional artificial potential field deeply, optimizes the sensor data with the introduction of the BP network and the GA algorithm, unmanned vehicles achieving autonomous obstacle avoidance and prognoses in advance when passing the path with obstacles, and eff Read More

This paper proposes a new method based on continuous wavelet transform circuits for the analysis of harmonics in real-time. To measure harmonics, the wavelet transform of harmonic signal is realized by analog CMOS VLSI composed of analog filter bank, whose impulse response is Morlet wavelet. Nonlinear least square method is employed to obtain the transfer function of the filter with CMOS log-domain integrator Read More

This paper presents a searching method for optimal frequency of variable frequency pulse charging. Based on the analysis of the characteristics of the battery impedance, we give charging frequency a positive and reverse disturbance to make it form a hysteresis loop. Variations of current were recorded before and after the two disturbances. According to the frequency disturbance rules based on the hysteresis loop, we determi Read More

Pumped-storage power plants are extensively used in power systems because of excellent performances in peak load, frequency regulation and emergency reserve. Generator-motor is an important part of pumped-storage power plant and plays a key role in the operation of the whole power plant, consequently the safety and stability of the power plant and even the power grid are directly influenced by the performance of ge Read More

In non-sinusoidal and unbalanced systems, optimal sizing of the capacitor banks is not a straightforward task as in sinusoidal and balanced systems. In this paper, by means of qualitative and quantitative analysis, it is interpreted that the classical capacitor selection algorithm widely implemented in Reactive Power Control (RPC) relays does not achieve optimal power factor improvement in non-sinusoidal and unbalanced systems. Read More

Aiming at the problem that the three-dimensional (3D) node localization precision is affected by the model parameters of least squares support vector regression (LSSVR) node localization method for wireless sensor network, a localization method based on LSSVR optimized by differential evolution (DE) algorithm is proposed in this paper. Firstly, the 3D node localization model is built through LSSVR and the kernel function p Read More

Flexible mechanical characteristics of power lines and poor conditions induce difficulties for the precise trajectory tracking control of a de-icing robot with an n-link robot manipulator. A robust fuzzy control based on adaptive sliding mode technique for precise trajectory tracking of a deicing robot is presented in this paper. The global controller is composed of three terms. The fuzzy inference system is utilized to approximate Read More

Improving transmission efficiency, quality factor, channel spacing and crosstalk levels are the top priorities in designing optical demultiplexers, suitable for wavelength division multiplexing applications. In this paper we proposed a novel structure for designing optical demultiplexer based on photonic crystal ring resonator. For performing wavelength selection task, we used two ring resonators. The resonance wavelength of th Read More

A novel ultra-wideband (UWB) radar system is showed in this paper. It contains a UWB picoseconds pulse transmitter, a balanced sampling receiver and antennas. The radar transmitter produces a couple of balanced pulses with very fast leading edges and high amplitude when the pulse repetition frequency (PRF) is up to 1MHz. The receiver downconverts the echo signals from the antenna. The transmitter and the receiv Read More

Wide-area integrated impedance protection (WIIP) algorithm based on wide-area measurement system is proposed for the purpose of improving the reliability and sensibility of fault component identification of wide-area protection. Two commonly used methods nowadays in wide-area protection are the current differential protection (CDP) and the directional pilot protection (DPP). The CDP, though responsive to all type Read More