一种开关磁阻风力发电机新型功率变换系统及其最大功率点跟踪控制

A novel power conversion system and its maximum power point tracking control for switched reluctance wind turbine

本文提出一种含可变励磁电压且所用开关管数量最少的新型开关磁阻发电机(SRG)功率变换器,包括主电路与励磁电路,主电路所需主开关管数量等于SRG相绕组数,励磁电路仅需一只主开关管。励磁电压与发电电压解耦并可独立控制,励磁电路无隔离环节并与主电路共地。在分析该新型功率变换器工作原理的基础上,针对变速风力发电应用工况,提出基于该新型功率变换器的SRG最大功率点跟踪(MPPT)控制方法,给出励磁电压扰动控制策略。通过对一台750W的SRG样机系统进行仿真和实验,并与基于共上管功率变换器的SRG风电MPPT进行比较,结果表明本文所述新型SRG功率变换器的输出功率增加1.5%,验证了该新型功率变换器及其控制策略的有效性。

A new type of switched reluctance generator(SRG)power converter with variable excitation voltage and the minimum number of switching tubes to date is proposed.The power converter consists of a main circuit and an excitation circuit.The main circuit requires a number of main switching tubes equal to the number of SRG phase windings,while the excitation circuit requires only one main switching tube.The excitation voltage is decoupled from the generation voltage and can be controlled independently.The excitation circuit has no isolation links and is common to the main circuit.The operating principle and control process of the new power converter are analyzed.A maximum power point tracking(MPPT)control method for the SRG based on this new power converter is proposed for variable speed wind power generation applications,and an excitation voltage disturbance control strategy is given.A 750W SRG prototype system is simulated and experimented,and compared with the SRG wind power MPPT based on a power converter with shared upper switching tubes.The results show a 1.5%increase in SRG output power based on this new variable excitation minimum switches power converter.The effectiveness of this new power converter is confirmed.