LCL型并网逆变器引发高频谐振是造成并网系统失稳最严重的原因之一,对系统的可靠运行造成了巨大的威胁。传统的基于逆变器自身端口阻抗重塑的有源阻尼方法不具备通用性,同时加大了控制环路的复杂程度,不利于用作多电力电子设备并网系统...LCL型并网逆变器引发高频谐振是造成并网系统失稳最严重的原因之一,对系统的可靠运行造成了巨大的威胁。传统的基于逆变器自身端口阻抗重塑的有源阻尼方法不具备通用性,同时加大了控制环路的复杂程度,不利于用作多电力电子设备并网系统的谐振抑制。关注到有源电力滤波器(active power filter,APF)动态控制环节的特点,基于无源性理论分析了APF用作阻尼输出的可行性及优势,提出了对APF进行模态切换以实现高频谐振的阻尼控制策略。该方案对谐振频率具备良好的跟踪效果,能够准确地识别系统模态并使APF迅速动作于对应频段的有源阻尼模态切换,具有通用性强、可靠性高、实现成本低的特点。通过仿真平台PLECS对提出的APF模态切换及高频谐振镇定策略进行验证,其结果与理论分析相符,进一步印证了APF用作有源阻尼抑制谐振的有效性。展开更多
A novel Opto-Chemical Ring Resonator （OCRR） has been presented for detecting gas odorant. The sensor is designed based on Morphology Dependent Resonances （MDR） which follows Maxwell＇s electromagnetic equations. I...A novel Opto-Chemical Ring Resonator （OCRR） has been presented for detecting gas odorant. The sensor is designed based on Morphology Dependent Resonances （MDR） which follows Maxwell＇s electromagnetic equations. In this paper, we have presented a novel technique to integrate chemical science and optical technology by using OCRR. Optical resonances of electromagnetic wave propagations in dielectric micro-ring resonator have been developed based on asymptotic approach. Parametric studies based on developed asymptotic expression have been presented to determine the resonance frequency at particular chemical composition. Finite element simulation is used to predict the performance of the sensor and found encouraging results for odorant sensing. Parametric studies show that present study will help to develop novel OCRR sensors tbr micro/nano technology and biomedical applications.展开更多
文摘LCL型并网逆变器引发高频谐振是造成并网系统失稳最严重的原因之一,对系统的可靠运行造成了巨大的威胁。传统的基于逆变器自身端口阻抗重塑的有源阻尼方法不具备通用性,同时加大了控制环路的复杂程度,不利于用作多电力电子设备并网系统的谐振抑制。关注到有源电力滤波器(active power filter,APF)动态控制环节的特点,基于无源性理论分析了APF用作阻尼输出的可行性及优势,提出了对APF进行模态切换以实现高频谐振的阻尼控制策略。该方案对谐振频率具备良好的跟踪效果,能够准确地识别系统模态并使APF迅速动作于对应频段的有源阻尼模态切换,具有通用性强、可靠性高、实现成本低的特点。通过仿真平台PLECS对提出的APF模态切换及高频谐振镇定策略进行验证,其结果与理论分析相符,进一步印证了APF用作有源阻尼抑制谐振的有效性。
文摘A novel Opto-Chemical Ring Resonator （OCRR） has been presented for detecting gas odorant. The sensor is designed based on Morphology Dependent Resonances （MDR） which follows Maxwell＇s electromagnetic equations. In this paper, we have presented a novel technique to integrate chemical science and optical technology by using OCRR. Optical resonances of electromagnetic wave propagations in dielectric micro-ring resonator have been developed based on asymptotic approach. Parametric studies based on developed asymptotic expression have been presented to determine the resonance frequency at particular chemical composition. Finite element simulation is used to predict the performance of the sensor and found encouraging results for odorant sensing. Parametric studies show that present study will help to develop novel OCRR sensors tbr micro/nano technology and biomedical applications.
