摘要：By using the complex finite element method （FEM） under perfectly matched layer （PML） boundary conditions, dispersion properties of microstructured optical fibres （MOFs） with elliptical air holes are analysed by changing the pitch and sizes of air holes belonging to the inner three rings. Meanwhile, the confinement loss of the fundamental mode is engineered to achieve the single-polarization single-mode transmission. Based on this analysis, a novel design of MOFs for properties of the single-polarization single-mode and the nearly zero ultraflattened dispersion between lpskm^-1 nm^-1 in the wavelength range of 1.2-1.6μm is presented for the first time.

摘要：针对三相LCL型光伏并网逆变系统中,直接功率控制(DPC)开关频率不固定、电流闭环控制动态响应慢的缺点,本文提出一种内环采用电流控制、外环采用功率控制的准DPC方法,兼顾DPC和电流控制的优点,且具有动态响应快、开关频率固定和电流正弦度高的优点。通过在Matlab/Simulink中搭建控制系统仿真模型,结果表明该控制策略具有一定的可行性。