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Power converters are crucial components of the wind turbine generator system (WTGS), and the reliability of wind power converters is susceptible to power fluctuations of the WTGS. The accurate lifetime estimation of power semiconductors should consider the long-time mission profiles of the WTGS. However, the existing junction temperature calculation methods don't meet the requirement for performance...
To investigate the input impedance of digital-controlled bi-directional DC/DC converters, this paper develops a modeling method based on the sampled-data approach. Because the nonlinear pulse-width modulator generates sideband components, the sideband effect occurs in a closed-loop converter. And the sampling process of a digital controlled system can significantly influence the sideband components...
Low-frequency oscillation occurs when the transmission lines equivalent impedance is small or negative. As the increase penetration of PV system, it plays an important role for system stability. A novel method for low-frequency oscillation suppression based on PV system is proposed. Model of PV accessed to power grid is established, which reveal the relationship between output power of PV system and...
The Switched Z-source Isolated Bidirectional DC-DC Converter (SZIBDC) is a novel topology that inherits the advantages of Dual Active Bridge (DAB) while overcoming its disadvantages. This paper presents the small-signal model of open-loop SZIBDC firstly. After that, five kinds of close-loop control strategies based on PI-regulator or Fuzzy Logic Controller (FLC) are theoretically analyzed and validated...
Based on the equivalent circuit model (ECM) of lithium-ion battery, this paper introduces an autoregressive and moving average with exogenous input (ARMAX) model. A recursive extended least square algorithm with forgetting factor is employed as the model parameter identification method, because there is a colored noise in operating process. Then HPPC test was conducted on a 20Ah LiFePO4 cell and the...
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