Considering the modeling errors of on-board self-tuning model in the fault diagnosis of aero-engine, a new mechanism for compensating the model outputs is proposed. A discrete series predictor based on multi-outputs l...Considering the modeling errors of on-board self-tuning model in the fault diagnosis of aero-engine, a new mechanism for compensating the model outputs is proposed. A discrete series predictor based on multi-outputs least square support vector regression （LSSVR） is applied to the compensation of on-board self-tuning model of aero-engine, and particle swarm optimization （PSO） is used to the kernels selection of multi-outputs LSSVR. The method need not reconstruct the model of aero-engine because of the differences in the individuals of the same type engines and engine degradation after use. The concrete steps for the application of the method are given, and the simulation results show the effectiveness of the algorithm.展开更多
海上风电直流汇集方式具有可避免交流电缆无功充电和过电压问题等优势,是未来主要发展方向之一。与柔性直流(modular multilevel converter based high voltage DC current,MMC-HVDC)不同,其通过直流变压器(DC transformer,DCT)低、高...海上风电直流汇集方式具有可避免交流电缆无功充电和过电压问题等优势,是未来主要发展方向之一。与柔性直流(modular multilevel converter based high voltage DC current,MMC-HVDC)不同,其通过直流变压器(DC transformer,DCT)低、高压端口实现海上风电发电侧与岸上MMC送出侧互联,系统的宽频振荡风险尚不明确,亟须开展阻抗建模及振荡特性分析。首先分别建立了计及岸上MMC对汇集端口耦合与海上风电对送出端口耦合的海上风电汇集系统阻抗模型;然后定量刻画了汇集和送出端口的小信号耦合通路,揭示了端口负阻尼特性主导影响因素,并分析了振荡风险;最后,基于Matlab/Simulink构建海上风电直流汇集系统电磁暂态仿真平台,仿真实验验证了汇集和送出端口振荡分析的准确性,发现耦合特性将影响海上风电直流汇集送出系统振荡分析结果。展开更多
文摘Considering the modeling errors of on-board self-tuning model in the fault diagnosis of aero-engine, a new mechanism for compensating the model outputs is proposed. A discrete series predictor based on multi-outputs least square support vector regression （LSSVR） is applied to the compensation of on-board self-tuning model of aero-engine, and particle swarm optimization （PSO） is used to the kernels selection of multi-outputs LSSVR. The method need not reconstruct the model of aero-engine because of the differences in the individuals of the same type engines and engine degradation after use. The concrete steps for the application of the method are given, and the simulation results show the effectiveness of the algorithm.
文摘海上风电直流汇集方式具有可避免交流电缆无功充电和过电压问题等优势,是未来主要发展方向之一。与柔性直流(modular multilevel converter based high voltage DC current,MMC-HVDC)不同,其通过直流变压器(DC transformer,DCT)低、高压端口实现海上风电发电侧与岸上MMC送出侧互联,系统的宽频振荡风险尚不明确,亟须开展阻抗建模及振荡特性分析。首先分别建立了计及岸上MMC对汇集端口耦合与海上风电对送出端口耦合的海上风电汇集系统阻抗模型;然后定量刻画了汇集和送出端口的小信号耦合通路,揭示了端口负阻尼特性主导影响因素,并分析了振荡风险;最后,基于Matlab/Simulink构建海上风电直流汇集系统电磁暂态仿真平台,仿真实验验证了汇集和送出端口振荡分析的准确性,发现耦合特性将影响海上风电直流汇集送出系统振荡分析结果。
