Megawatt wind energy conversion system with diode rectifier and multilevel current source inverter
Megawatt wind energy conversion system with diode rectifier and multilevel current source inverter
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DOI：
10.1109/ecce.2011.6063862
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发表时间：
2011-11
期刊：
影响因子：
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通讯作者：
Jiacheng Wang;Jingya Dai;Bin Wu;D. Xu;N. Zargari
中科院分区：
文献类型：
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作者：
Jiacheng Wang;Jingya Dai;Bin Wu;D. Xu;N. Zargari
提出了一种基于二极管整流加多电平电流型逆变器的同步发电机直驱兆瓦级风能转换系统的拓扑结构。在发电机端，采用二极管整流以降低成本。假设网侧变流器为脉宽调制(PWM)电流型逆变器(CSI)，分析了采用二极管整流器的可行性及其对系统控制、运行范围和额定设计的影响。结果表明，在器件开关频率有限的情况下，用多电平结构代替网侧的单一PWM-CSI有效地提高了逆变器的等效频率，降低了对滤波电容的要求，扩展了整个系统的工作范围，给系统的诸多方面带来了好处。为了实现多电平逆变器的工作，设计了一种具有良好的谐波分布和最小开关频率的五电平空间矢量调制方案。通过合理选择冗余开关状态，实现了逆变桥并联之间的直流电流平衡。给出了一个2 MW的MatLab/Simulink模型的仿真结果，验证了所提概念的正确性。
This paper proposes the topology of diode rectifier plus multilevel current source inverter for synchronous generator based direct-drive megawatt wind energy conversion systems. On the generator side, the diode rectifier is employed for cost reduction. Assuming the grid-side converter is a pulse-width modulated (PWM) current source inverter (CSI), analyses on feasibility of using the diode rectifier and its impact on system control, operating range and rating design are presented. It is then revealed that under limited device switching frequency, using a multilevel configuration to replace the single PWM-CSI on the grid side effectively increases the equivalent inverter frequency, lowers the requirement on filter capacitance, extends the whole operating range and therefore brings benefits to many aspects of the system. For operation of the multilevel CSI, a five level space vector modulation scheme offering superior harmonic profile and minimum switching frequency is designed. The dc current balancing between paralleled inverter bridges is realized by proper selection of redundant switching states. Simulation results obtained from a 2MW Matlab/Simulink model are provided to verify the proposed concepts.