In this paper, we proposed an output voltage stabilization of a DC-DC Zeta converter using hybrid control. We modeled the Zeta converter under continuous conduction mode operation. We derived a switching control law t...In this paper, we proposed an output voltage stabilization of a DC-DC Zeta converter using hybrid control. We modeled the Zeta converter under continuous conduction mode operation. We derived a switching control law that brings the output voltage to the desired level. Due to infinite switching occurring at the desired level, we enhanced the switching control law by allowing a sizeable output voltage ripple. We derived mathematical models that allow one to choose the desired switching frequency. In practice, the existence of the non-ideal properties of the Zeta converter results in steady-state output voltage error. By analyzing the power loss in the zeta converter, we proposed an improved switching control law that eliminates the steady-state output voltage error. The effectiveness of the proposed method is illustrated with simulation results.展开更多
This paper is an experimental study on figure switching errors of student interpreters in their English to Chinese consecutive interpreting. The study examined interpretation recordings during the second round of the ...This paper is an experimental study on figure switching errors of student interpreters in their English to Chinese consecutive interpreting. The study examined interpretation recordings during the second round of the 2016 ACIC, focusing on how student interpreters coped with figures. Observation results show that omission is the most common error for all students and for the four types of figures involved in the research. Most errors are made in the translation of big round numbers. Fast speed of the source speech as well as figure clusters turn out to be the most outstanding causes for errors. Such observation results are expected to provide implications for future interpreting teaching.展开更多
A graphical and visual simulation system for the study of optical packet switching (OPS) nodes is accomplished. With the simulation system, the effect on physical performance-bit error rate (BER) due to a variety of ...A graphical and visual simulation system for the study of optical packet switching (OPS) nodes is accomplished. With the simulation system, the effect on physical performance-bit error rate (BER) due to a variety of factors such as the crosstalk parameters of OPS nodes, number of cascaded OPS nodes, length of optical output buffer, traffic load and fluctuation of amplitude of optical signals are evaluated. Reliability of the simulation system is proved by the analytical results obtained in all the above cases.展开更多
四线电压源逆变器已成为电源和负载之间的理想接口转换器。在传统有限控制集模型预测控制(Finite Control Set Model Predictive Control,FCS-MPC)下,每个周期内开关管的状态变化没有规律,导致开关频率不固定,输出电能纹波较大。在传统F...四线电压源逆变器已成为电源和负载之间的理想接口转换器。在传统有限控制集模型预测控制(Finite Control Set Model Predictive Control,FCS-MPC)下,每个周期内开关管的状态变化没有规律,导致开关频率不固定,输出电能纹波较大。在传统FCS-MPC控制下,逆变器输出的电压方向和大小固定,在整个控制轨迹内可能达不到边界,导致跟踪精度有限。文章提出了基于电容中分式四线制逆变器的在线占空比调制预测控制策略,该策略兼顾FCS-MPC动态响应速度快和调制策略开关频率固定的优势,控制器可在较低的采样率下实现恒定开关频率和最小误差跟踪。展开更多
文摘In this paper, we proposed an output voltage stabilization of a DC-DC Zeta converter using hybrid control. We modeled the Zeta converter under continuous conduction mode operation. We derived a switching control law that brings the output voltage to the desired level. Due to infinite switching occurring at the desired level, we enhanced the switching control law by allowing a sizeable output voltage ripple. We derived mathematical models that allow one to choose the desired switching frequency. In practice, the existence of the non-ideal properties of the Zeta converter results in steady-state output voltage error. By analyzing the power loss in the zeta converter, we proposed an improved switching control law that eliminates the steady-state output voltage error. The effectiveness of the proposed method is illustrated with simulation results.
文摘This paper is an experimental study on figure switching errors of student interpreters in their English to Chinese consecutive interpreting. The study examined interpretation recordings during the second round of the 2016 ACIC, focusing on how student interpreters coped with figures. Observation results show that omission is the most common error for all students and for the four types of figures involved in the research. Most errors are made in the translation of big round numbers. Fast speed of the source speech as well as figure clusters turn out to be the most outstanding causes for errors. Such observation results are expected to provide implications for future interpreting teaching.
文摘A graphical and visual simulation system for the study of optical packet switching (OPS) nodes is accomplished. With the simulation system, the effect on physical performance-bit error rate (BER) due to a variety of factors such as the crosstalk parameters of OPS nodes, number of cascaded OPS nodes, length of optical output buffer, traffic load and fluctuation of amplitude of optical signals are evaluated. Reliability of the simulation system is proved by the analytical results obtained in all the above cases.
文摘四线电压源逆变器已成为电源和负载之间的理想接口转换器。在传统有限控制集模型预测控制(Finite Control Set Model Predictive Control,FCS-MPC)下,每个周期内开关管的状态变化没有规律,导致开关频率不固定,输出电能纹波较大。在传统FCS-MPC控制下,逆变器输出的电压方向和大小固定,在整个控制轨迹内可能达不到边界,导致跟踪精度有限。文章提出了基于电容中分式四线制逆变器的在线占空比调制预测控制策略,该策略兼顾FCS-MPC动态响应速度快和调制策略开关频率固定的优势,控制器可在较低的采样率下实现恒定开关频率和最小误差跟踪。
