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Firstly, it introduces the different operating modes and control mechanism of the high-voltage DC transmission (HVDC) system and analyzes the fuzzy control theory. On this basis, using MATLAB, a typical 12-pulse HVDC transmission system model of the bridge has been simulated under the control of traditional PI and fuzzy intelligent respectively. Compared with the traditional control methods, the real-time...
PWM rectifier technology is introduced to the main Power Circuit of the charger for aircraft battery to enhance the charging efficiency of aircraft battery and improve its long term reliability and save its life in this paper. A new strategy of DPC Based on the Space Vector Modulation (SVM) is used in PWM rectifier, Meanwhile, a fuzzy PI controller is designed in DC voltage control loop. The simulation...
In order to improve the reliability of Ultra HVDC transmission system, hierarchic control structure on UHVDC control system is discussed in this paper. Some special control requirements are introduced, compared with the conventional ??500 kV HVDC system. The special coordination control strategy of UHVDC for Balanced Operation of Dual 12-Pulse Converter Groups is proposed, A new fuzzy PI controller...
This paper presents a control strategy for a rectifier with variable speed direct driven permanent magnet synchronous generator. In order to achieve maximum power point tracking (MPPT) for wind power generation systems, the rotating speed of wind turbines should be adjusted in the real time according to wind speeds. The fuzzy logic controller is used to track generator speed with varying wind speed...
This paper presents a novel fuzzy logic controller (FLC) for three-phase PWM Rectifier. The fuzzy logic controller is employed in the outer voltage loop. In order to improve the performances of current loop, the antiwindup PI controller of inner current controller is used instead of the traditional PI controller. The complete control scheme of the three-phase PWM Rectifier is implemented in real time...
Voltage-source multilevel inverters have become very attractive for power industries in power electronics applications during last years. The main purposes that have led to the development of the studies about multilevel inverters are the generation of output voltage signals with low harmonic distortion; the reduction of switching frequency. A serious constraint in a multilevel inverter is the capacitor...
Two-loop control based on a kind of neural networks current inner-loop and hybrid fuzzy-PI voltage outer-loop is discussed in the paper. As far as three phase voltage converter system is concerned, the control of neural networks makes it more strongly robust, hybrid fuzzy-PI accelerate the response of system. To improve the antiinterference of system, the current feedforward compensator is added....
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