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The reliability of the convertor in double-fed wind power generator set is relatively poor. Once the switch of the convertor fails, the entire wind turbine set may be severely damaged or shut down. As to the issues, an open-circuited fault detection method is proposed on the basis of parameter estimation for the switch of rotor side convertor in double-fed wind power generator set. A whole model is...
In this paper, we consider a modification design of a class of Lyapunov-based robust controllers subject to bounded input. Our modification shows benefits in enhancing the input utilization and in retaining the stability and the robustness of the original control. An estimation of the stabilization region is proposed to explore region where the control is modified. It results in an estimate showing...
Energy efficiency has been recognised as one of the key issues in achieving sustainable manufacturing. The first step towards energy efficiency is to develop an effective approach in understanding and characterising energy consumption of a manufacturing system. Existing methods to model energy consumption are reviewed in three levels, machine level, process level, and factory level. The reviewed studies...
In this letter, a novel maximum Doppler spread estimation algorithm is presented for OFDM systems with the comb-type pilot pattern in doubly selective fading channels. First, the least-squared estimated channel frequency responses on pilot tones are used to generate two auto-correlation matrices with different lags. Then, according to these two matrices, a Doppler dependent parameter is measured....
Cognitive radio and OFDMA attracts a lot of attentions in academic and industry fields. In this paper, the asymptotic performance of an uplink radio resource allocation scheme is investigated for OFDMA-based cognitive radio networks. Considering the characteristics of cognitive radio and OFDMA, in the uplink subcarrier allocation algorithm, the subcarriers are allocated to the users with the best...
In this paper, a novel maximum Doppler spread estimation algorithm is presented for OFDM systems with the comb-type pilot pattern. The least squared estimated channel frequency responses (CFR's) on pilot tones are used to generate the auto-correlation matrices with/without a known lag, from which the time correlation function can be measured. The maximum Doppler spread is acquired by inverting the...
In this paper, a parametric channel estimation algorithm applicable to uplinks of orthogonal frequency division multiple access (OFDMA) systems whose subcarriers are pseudo-randomly allocated is proposed. By exploiting pilot hopping, estimation of signal parameters via rotational invariance technique (ESPRIT) is employed to estimate the path delays of the sparse multipath fading channel. From the...
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