Accurate simulation of characteristics performance and state of health (SOH) estimation for lithium-ion batteries are critical for battery management systems (BMS) in electric vehicles. Battery simplified electrochemical model (SEM) can achieve accurate estimation of battery terminal voltage with less computing resources. To ensure the applicability of life-cycle usage, degradation physics need to be involved in SEM models. This work conducts deep analysis on battery degradation physics and develops an aging-effect coupling model based on an existing improved single particle (ISP) model. Firstly, three mechanisms of solid electrolyte interface (SEI) film growth throughout life cycle are analyzed, and an SEI film growth model of lithium-ion battery is built coupled with the ISP model. Then, a series of identification conditions for individual cells are designed to non-destructively determine model parameters. Finally, battery aging experiment is designed to validate the battery performance simulation method and SOH estimation method. The validation results under different aging rates indicate that this method can accurately estimate characteristics performance and SOH for lithium-ion batteries during the whole life cycle.

As high-precision manufacture developed rapidly, silicon-based devices have been unable to meet the performance indicators of the system and gradually replaced by wide bandgap semiconductors with high breakdown voltage and high junction temperature. However, the high-speed switching characteristics of wide-bandgap power devices such as SiC MOSFETs also bring new problems to the drive control of the system. For instance, the crosstalk phenomenon can cause the SiC MOSFET to be mis-turned on or reverse breakdown, which will seriously affect the system stability. This article will focus on the crosstalk problem in the circuit unfolds. Firstly, this paper analyzes the generation principle of positive and negative crosstalk in bridge circuit structure. Secondly, this paper presents a new type of drive circuit after summarizing and comparing existing crosstalk suppression methods. Finally, the correctness and effectiveness of the proposed circuit are verified from the following aspects: theoretical analysis, LTspice simulation and experiments.

A novel current controlled scheme based on port-controlled Hamiltonian and energy-shaping control method has been proposed for the grid-connected inverter. Compared to traditional current controllers, such as proportional-resonant controller, only one control parameter requires to be tuned in the proposed energy-shaping controller. Moreover, the proposed energy-shaping control can not only realize a quick tracking reponse, but also improve the steady-state performance of the injected grid current whether or not the grid voltage is distorted. Simulation and experimental results have validated the correctness and feasibility of the proposed scheme through a 1 kW grid-connected inverter system.

Y-source inverter has been proposed for a few years, but it still has some drawbacks. So, many studies of related topologies have been carried out to address the issues of traditional Y-source inverter (YSI). There are always dc-link voltage spikes which come from the leakage inductances of the coupled inductors in YSIs. Therefore, this paper proposed a modified topology of Y-source inverter to solve the problems by adding additional circuit to absorb the leakage energy. And it inherits all the advantages of the original YSIs and have better performance. The simulation based on the PLECS platform has been carried out with in-depth analysis. In addition, experiment results have been presented to prove the features of the proposed topology.

Y-source inverter has been proposed for a few years, but it inherits many problems from coupled-inductor impedance-source inverters (CISIs). The most common drawback comes from the leakage inductances which leads to less efficiency and large dc-link voltage spikes. The dc-link voltage spikes then bring heavy burden on switches voltage level and result in a lower overall step-up ratio. Therefore, a modified Y-source inverter (M-YSI) has been proposed in this paper to solve the above problems by adding additional path for the leakage energy. The simulation based on PLECS has been carried out with in-depth analysis. Besides, experiment results have been presented to verify the simulation.

Y-source inverter has been proposed for a few years, but it inherits many problems from coupled-inductor impedance-source inverters (CISIs). So, many studies to address the issues of traditional Y-source inverter have been carried out. However, the reliability of a field working Y-source inverter has never been studied. In this paper, a modified topology of Y-source inverter is proposed which can solve the problem of discontinuous input current and increase boost ratio. The reliability of the proposed modified Y-source inverter (M-YSI) is studied using Physics-of-Failure approach. The lifetime of the proposed topology is predicted under a real mission profile in photo-voltaic application.