An Efficient Hierarchical Zonal Method for LargeScale Circuit Simulation and its Real Time Application on More Electric Aircraft Microgrid Largescale circuit simulation poses a challenge to most simulation tools because of its high computational complexity. This paper presents an efficient method, which decouples the circuit topology and componentsu0027characteristics in computation so as to make it suitable for largescale circuit simulation. The proposed method is based on a circuit lemma, which indicates the relationship of branch voltages and currents. The proving process of this lemma is provided in this paper. The working principle of the proposed method is elaborated and its numerical stability is also analyzed. This method achieves nearly linear computational complexity and is very suitable for hierarchical and zonal computation. The proposed method is verified by real time application on the more electric aircraft microgrid. Hardwareintheloop testing of this study case on Xilinx Virtex Ultrascale field programmable gate array (FPGA) board is achieved and the results are compared with PSCADEMTDC. The resulting waveforms from these two simulation tools show very good agreement on both normal and fault operation test scenarios, which demonstrates that the proposed method has very good performance on computational accuracy and efficiency.

MultiThread Assembling for Fast FEM Power Delivery DC Integrity Analysis Power integrity analysis is of great significance in the field of circuit design, especially the design of modern high speed circuit system. For the high performance printed circuit boards (PCBs) and IC design, power delivery network DC integrity checks play an important role. However, the element assembling process in finite element method (FEM) can take significant portion of total computing time. In this paper, a fast finite element assembling method for power network DC integrity checks of PCBs is proposed. We divided the mesh into a serious of bins and elements in different bins could be assembled in parallel. Further more, a dynamic circle shape approximation method is introduced to further control the number of elements due to vias and circular objectives. As a result, the new solver can easily perform progressive trade off between speed and accuracy. Experimental results of two PCB examples on a 3.6GHz Intel i7 Dualcore CPU show that the proposed multithread assembling method can achieve 2X speedup over existing singlethread assembling methods. A dynamic circle shape approximation method is introduced to further control the number of elements and speed up the solver process. The resulting FEM solver leads to 3X speed over a commercial power integrity solver with no more than 0.7% errors.