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With the improvement in the power electronic technologies, medium voltage dc (MVDC) electrical distribution systems are being considered for on-shore and off-shore applications. These future MVDC electrical distribution systems are expected to provide the possibility of easy interfacing of the renewable energy sources, improving the dynamics of the system and also help in reducing the carbon footprint...
In view of LCL-type grid-connected inverter system, traditional methods can hardly realize multigoal analysis and optimization, thus, a research is carried out on the visualization method based on D-partition method. In consideration of the discrete characteristic of digital control, this paper infers the establishment conditions of D-partition method in z domain, and compares it with D-partition...
Phase locked loop (PLL) and Park transformation largely affects the stability of a grid-inverter system. Impedance-based approach is employed to analyze the effect of PLL to stability in this paper. Self-admittance and accompanying admittances are set up to represent the inverter including the PLL effect, and Nyquist criterion is employed to analyze the system stability. An asymmetric current control...
As the penetration of complex grid-connected devices, such as power electronic inverters, increases, so too does the complexity of analyzing system stability. A graphical application of the Nyquist stability criterion is presented that indicates how an individual load and source each contribute to the closed-loop system grid eigenvalues. The case study is not limited to particular impedance forms...
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