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This paper intends to propose a novel clustering method based on ant colony (AC) algorithm. A new approach called TT-transform based time frequency analysis is used in processing the non-stationary power signal disturbances. The time-time transform is the inverse Fourier transform of S-transform. The proposed model is demonstrated using feature vector from the domain of power signal analysis, yielding...
The contribution presents the preliminary results of the 4D simulation (time-development in 3D space) of the ultrasonic field in the experimental computerized transmission tomography system. The temporal development is synthesized here from the dynamic-steady-state 3D harmonic simulations (based on Helmholtz formulation) by linearly combining those using proper complex weights. The results of the...
A new oscillator macromodel in the form of phase differential equation is proposed. The comparison of new macromodel with the Adler equation and with the macromodel based on Floquet theory is presented. It is shown that the proposed approach allows to perform phase noise analysis of any oscillator circuit with arbitrary periodic injection waveform. The approach can be easily implemented into a circuit...
LCL filter offers a better choice of attenuating switching frequency harmonics, since compared with L or LC filters the value of required inductance is smaller. But LCL filter may cause resonance which is a disaster for the systempsilas stability. In order to solve the problem, a two-current-loop control strategy which includes grid-current outer loop and filter-capacitor-current inner loop is used...
To improve the output performance of cascaded H-bridge multilevel inverter under faulty conditions, this paper presents an optimized method suitable for harmonic cancellation while the faulty inverter are operated with neutral shift. With some parameters adjusted according to the fault type, the line to line voltages of the cell-fault inverter are increased than traditional control method, while keeping...
This paper presents a nonlinear control strategy for unified power quality conditioner(UPQC) with better stability and dynamic performance in comparison with PI control and classical decoupled strategy. The analysis is based on the rotating reference frame, and the nonlinear property of UPQC mode is partly dealt through the exact linearization via feedback. The operation of control circuit has been...
This paper presents a design of a voltage controller of single-phase voltage source PWM inverter with LC filters. To compensate voltage distortion from non-linear loads, the resonant controller has been proposed. However, the design of the control system with the resonant controller is not clear. So we propose the design with the Coefficient Diagram Method (CDM).
The Selective Harmonic Elimination (SHE) PWM technique has become a significant PWM method for less switching loss for three-level neutral-point-clamped (NPC) inverter. This paper introduces an online optimization approach to the SHEPWM technology based on genetic algorithm and BP neural network. The method doesnpsilat need to preset the initial values and to predict the trend of these values over...
This paper investigates different transformer winding connections on industrial electrical networks. Calculation of electrical parameters such as voltage, current and KVA for various winding types are derived mathematically. "Phase multiplication" is an effective harmonic mitigation technique using phase-shifting transformers. The design of a specified phase-shifting angle and calculation...
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