Offshore wind power generation system's reliability is always a challenging task. To solve the current sensor offset fault problem in the electric powertrain for the offshore wind power generation system, in this paper, a current-detection based sensor offset fault diagnosis method is proposed. The proposed method adopts four fixed measuring points for the estimation of the offset values, which does not require any modifications to the traditional PWM generating strategy. Therefore, the total harmonic distortion (THD) of the drive is not increased by using the proposed offset fault estimation method. The offset fault parameters of the powertrain system are obtained by analyzing the detected current sensors in the aforementioned four sampling points directly. No complex observers nor filters are needed for the signal processing, resulting in computational burden reduction. Experimental results on a 1 kW PMSG system demonstrated the effectiveness of the proposed strategy, which show that the current sensor offset faults can be estimated accurately, and the adverse effects can be eliminated.
The light-emitting diode (LED) is an essential component of intelligent street lighting (ISL) systems. An efficient ISL system can not only reduce power consumption by planning LED illuminating time but also reduce maintenance costs through a high degree of automation. In this paper, a buck-boost converter is used to realise composite transmission of power and signals for an ISL system. The power is modulated by the pulse width modulation (PWM) approach, and the switching ripple generated in the PWM process is utilised as the carrier of the signals transmitted between the remote-control centre and the slave nodes. Moreover, the proposed model involves a ‘request to send (RTS)/confirm to send (CTS)’ mechanism to avoid signal conflicts. Compared with the conventional power line communication (PLC) approach, the proposed transmission scheme has the advantages of simple circuit structure and simple system wiring. Additionally, a simulation model built in MATLAB/Simulink proves the designed transmission method has strong anti-noise ability.
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