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In this paper, the control strategy of the dual mode inverter is analyzed firstly. In island operation, inverter uses the improved inverse droop control. Furthermore, in gridconnected operation, the inverter is controlled by the power and current double loop. Then, the inverter smooth switching control method to/from grid-connected and islanded modes is designed in this paper. The switching method...
Wind turbine is a mechanical-electrical—hydraulic integration complex dynamic systems, which consists of the mechanical, electrical and hydraulic servo mechanism, with nonlinear and strong coupling characteristics; Random wind makes the wind turbine shows some characters such as randomness, hybrid and so on. The accidents of the wind turbine become more frequent both at home and abroad; From bearing...
The purpose of this paper is to find an innovative, high efficiency, practical and low cost control system structure with an optimized control strategy for small-scale grid-connected wind turbine with direct-driven permanent magnet synchronous generator (PMSG). This research adopts the sensorless vector control strategy based on phase-locked loop (PLL) for PMSG control, and the grid-side inverter...
This paper introduces the operating principle of back-to-back converter in direct-drive variable speed constant frequency (VSCF) wind power system. In system in order to obtain the accurate information of motor speed and angle, and alleviate the shortcomings, a new estimation method of permanent magnet synchronous generator (PMSG) speed and rotor position based on phase-locked loop (PLL) is proposed...
In parallel converters applications, direct parallel topology was respected because of the advantages of small size, low cost, simple structure and easy to extend. However, the coupling effects maybe exist because the parallel converters are connected by non-isolated mode. In this paper the average model was proposed in the rotating coordinate system. As the entire system is a symmetric structure,...
In this paper, modeling of parallel three-phase converters is first presented. Then definition of the circulating currents of paralleled converters and the circulating-current-generating mechanism are clearly explained. Thus, based on this definition, an averaged model of the circulating current is proposed. It is seen from this model that the circulating current consists of mainly the zero-sequence...
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