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Phase locked loop (PLL) is an important part of the current-controlled grid-connected converter. Its job is to estimate the phase angle of the grid voltage. If the PLL is not robust, the grid-voltage distortion will lead to an error in the estimated phase leading to a degradable performance of the converter. In this paper, the effect of the PLL on the operation of a current-controlled voltage-source...
This paper describes a new approach to estimate harmonics/interharmonics of power system voltages and currents based on a hybrid artificial neural network (ANN) and extended Kalman filter (EKF) structure. A very low sampling rate is used to implement the proposed ANN-EKF structure with the modest hardware demands. The ANN structure is used for spectral estimation, consumes a very low processing power,...
Overall understanding on the nature and characteristics of the harmonics penetration between different voltage levels is necessary and significative. Factors affecting harmonic penetration are checked in the paper. After comprehensive analysis considering more than one factor simultaneously with the help of 3-dimension mesh plots, the distribution characteristics of with respect to key factors in...
In the networking operation of wind power generation, grid-connected inverter is important for energy conversion and transmission. But the output current with harmonic component is increased due to the inverterpsilas low switching frequency of PWM signal. In order to reduce the harmonic current of grid-connected inverter, hybrid filter is used in the design of the grid-connected inverter in this article...
The method of harmonious detecting is introduced about PV grid connected generation, and the technique is realized to harmonious synchronous sampling based on PLL circuit of hardware, in order that the error is eliminated for non-synchronous sampling at all. It is used to analyze the harmonic of PV system for FFT algorithm based on B-H window function and interpolation, and the error is minished by...
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