CAJ | 학술논문

双馈式风电机组已成为风电领域应用最为广泛的一种主流机型。推导了双馈电机在发电机惯例下的动态数学模型，用内模控制实现双馈电机转子电流内环和转速外环的控制，提出了基于内模控制的柔性并网运行控制策略，应用PSCAD／EMTDC建立了完备的2MW并网运行双馈式风力发电系统仿真模型，对风速突变时系统柔性并网响应特性进行了细致的仿真研究。研究结果表明，建立的双馈式风电系统模型控制性能和动态响应速度均较好，提出的控制策略能快速地控制发电机的定子电压满足并网条件。通过风速突变工况仿真模拟可以看出，该系统实现了双馈式风电系统在变风速条件下的柔性并网。仿真结果与理论分析相一致，验证了仿真模型的正确性。
쌍궤식풍전궤조이성위풍전영역응용최위엄범적일충주류궤형。추도료쌍궤전궤재발전궤관례하적동태수학모형，용내모공제실현쌍궤전궤전자전류내배화전속외배적공제，제출료기우내모공제적유성병망운행공제책략，응용PSCAD／EMTDC건립료완비적2MW병망운행쌍궤식풍력발전계통방진모형，대풍속돌변시계통유성병망향응특성진행료세치적방진연구。연구결과표명，건립적쌍궤식풍전계통모형공제성능화동태향응속도균교호，제출적공제책략능쾌속지공제발전궤적정자전압만족병망조건。통과풍속돌변공황방진모의가이간출，해계통실현료쌍궤식풍전계통재변풍속조건하적유성병망。방진결과여이론분석상일치，험증료방진모형적정학성。
At present the doubly-fed induction generator （DFIG） becomes the most widely applied type of wind power generators. According to the convention of generator, a dynamic mathematical model of DFIG is derived, in which the inner loop control of rotor current and outer loop control of rotating speed of DFIG is implemented by internal model control, and a flexible control strategy for grid-connected operation of DFIG based wind power generation system is put forward. Using PSCAD/EMTDC, a complete simulation model of grid-connected DFIG power generation system with capacity of 2MW is built to perform detailed simulation research on the response characteristics of flexibly grid-connected wind power generation system while wind speed abruptly changes. Research results show that the control performance and dynamic response speed of the built DFIG based wind power generation system possesses is satisfied, and the proposed control strategy can rapidly control stator voltage of DFIG and makes it meeting the condition for grid-connection. It can be seen from the simulation of operating condition under abrupt change of wind speed that using the proposed control strategy the DFIG based generation system can be flexibly grid-connected under varying wind speed. Simulation results conform to those from theoretical analysis, thus the correctness of the proposed simulation model is proved.