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微水电是新能源的重要组成部分,但其供电质量较差,微水利用率低。为提高微水电电能质量和微水资源利用率,在传统微水发电系统的研究基础上,采用双馈发电机和双脉宽调制(pulse width modulation,PWM)变换器,分析基于交流励磁发电机和双PWM拓扑结构的可并网微水电励磁控制策略,可分为网侧和转子侧控制策略。网侧变换器采用了定子电压定向和前馈补偿控制,实现了网侧变换器直流环节电压、电流双闭环控制,有效控制了交流侧输入的有功功率;转子侧变换器采用了基于瞬时功率的开环控制,使其输出电流与电压保持同频同相,实现微水电有功和无功功率的解耦及单位功率因数并网控制。仿真实验结果表明,在亚同步转速范围内控制策略具有可行性和有效性。
Micro-hydropower is an important part of new energy, but its power supply quality is poor, low water use efficiency. In order to improve the quality of micro-hydroelectric power and the utilization rate of micro-water resources, based on the research of traditional micro-hydro power generation system, a doubly fed generator and a pulse width modulation (PWM) And dual PWM topologies can be grid-connected micro-hydro excitation control strategy can be divided into network side and rotor side control strategy. The grid-side converter adopts stator voltage orientation and feed-forward compensation control, which realizes the double-loop control of the voltage and current in the DC link of the grid-side converter and effectively controls the active power input on the AC side. The rotor-side converter adopts the instantaneous power Open-loop control, the output current and voltage to maintain the same frequency with the phase, to achieve the micro-hydropower active and reactive power decoupling and unity power factor and grid control. The simulation results show that the control strategy in the sub-synchronous speed range is feasible and effective.