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Shanghai, China

Wang H.,Wind Power Research Center | Dou Z.,Wind Power Research Center | Zhang J.,Wind Power Research Center | Cai X.,Wind Power Research Center | Cai X.,Shanghai JiaoTong University
Taiyangneng Xuebao/Acta Energiae Solaris Sinica | Year: 2014

An improved proportional resonant (PR) control strategy was introduced to control the grid connection inverter and the current resonant problem brought by the LCL filter of grid inverter was solved by using the capacitor current feedback in the static coordinate. Since the extra coordinate transformation from the static coordinate to the rotation coordinate was not necessary, so the digital realization process become very easy. The experiment was performed to verify the correction of the presented control strategy and the experimental results showed that the whole system has merits of easy adjustment of grid power factor and none flashing current to the grid. Source


Dou Z.,Wind Power Research Center | Zhang Q.,Wind Power Research Center | Ling Z.,Wind Power Research Center | Cai X.,Wind Power Research Center | Cai X.,Shanghai JiaoTong University
Lecture Notes in Electrical Engineering | Year: 2011

In the laboratory without the condition of actual wind farm or wind turbine, building a wind turbine output characteristic emulation system can provide an effective way for the research on WPGS. Firstly the wind turbine torque model was built, redistributed the bladed element by weight coefficient and calculated the wind turbine torque based on the blade element theory. Then characteristics of the wind turbine were emulated by controlling the DC motor armature winding current. So the wind turbine emulator based virtual wind was built. Finally the experiment platform of VSCF WPGS was also built. The experiments not only confirms the correctness and superiority of the detailed wind turbine model, reflects the rapid tracking performance of the emulated torque, but also simulates the wind turbine to meet the research of VSCF WPGS such as the sub-synchronous or super-synchronous running of DFIG, consequently verifies the correctness of the control strategies for variable speed constant frequency WPGS. © Springer-Verlag Berlin Heidelberg 2011. Source

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