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With the increasing size of the wind farms, the impact of the wake effect on the energy yields and lifetime consumption of wind turbine can no longer be neglected. In this paper, the affecting factors like the wind speed and wind direction are investigated in terms of the single wake and multiple wakes. As the power converter is the most fragile component among the turbine system, its lifetime estimation...
In this paper, an enhanced control strategy of the smooth transition between the grid-tied and stand-alone operation modes of the distributed generation (DG) inverter is proposed. In the grid-connected mode, the DG inverter controls active and reactive powers flowing into the grid by regulating grid currents using typical proportional integral plus resonant (PI+R) controllers, while direct voltage...
This paper presents a mitigation strategy to reduce the risk of Subsynchronous Controller Interaction (SSCI) in Doubly-Fed Induction Generator (DFIG) based wind farms. SSCI mitigation is achieved through the modification of the controller structure within the DFIG turbine. A proportional damping controller tuned to the SSCI oscillatory frequency is proposed and implemented in the current controller...
This paper presents an optimized design of 12kW 2L-FB inverter for small-scale wind turbine, taking into account some specific behavioral features of SiC power MOSFETs. Power converters used in renewable energy conversion have to deal with intermittent and variable power availability from the source, which implies that they actually work at their maximum rated power for only a small fraction of their...
Maximum power point tracking (MPPT) has been widely studied since it is closely related to the efficiency of wind harvesting. Generally, there are two major approaches to realize MPPT. One is to reach the optimal power point by perturbing and observing the extracted wind power; the other is to reach the optimal power output by tracing the turbine power curve. Each approach has its pros and cons and...
In the power grid lacking conventional power sources for black start, adopting wind farm as a power source for black start is a beneficial attempt. With Jangsu local power grid as research object in China, and combining with the special geographical and demand of the local power grid, a black start scheme using permanent-magnet synchronous generator(PMSG)-based wind farm as black start power is proposed...
Considerable wind resources are aggregated on Taiwan west coasts that adjacent to Taiwan Strait, it promotes the domestic government to develop the off-shore wind farms for the applications of renewable energy. The first MW level wind turbine testing site that be connected to the 11.4 kV distribution system is also under construction in Taiwan, which is expected to provide testing and certification...
Due to the challenge of energy demand, renewable energy sources are introduced to our daily life in order to satisfy the energy demand and reduce the emission of greenhouse gas. But the increasing penetration of renewable energy sources causes obvious impact on the conventional power systems especially the control strategies. In order to solve the problem, microgrid is introduced, which usually consists...
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