<span style="font-family:Verdana;">This paper investigates the behaviors of Boost DC Chopper used in Photovoltaic energy systems where the solar irradiation changes during the day time causing current ...<span style="font-family:Verdana;">This paper investigates the behaviors of Boost DC Chopper used in Photovoltaic energy systems where the solar irradiation changes during the day time causing current and voltage changes. Varying the solar irradiation causes output chopper voltage changes in order to keep working at maximum extracted solar power. The chopper voltage changes leading to variable duty cycle operation of chopper switch and causes </span><span style="font-family:Verdana;"><span style="font-family:Verdana;"><span style="font-family:Verdana;">a </span></span></span><span style="font-family:Verdana;"><span style="font-family:Verdana;"><span style="font-family:Verdana;">significant change in switch losses in terms of the dissipated power. In addition to that the chopper behaviors are studied when the chopper voltage is boosting up to a predetermined reference value leading to </span></span></span><span style="font-family:Verdana;"><span style="font-family:Verdana;"><span style="font-family:Verdana;">a </span></span></span><span style="font-family:Verdana;"><span style="font-family:Verdana;"><span style="font-family:Verdana;">significant change in chopper current, voltage, duty cycle and occurred losses. A mathematical model for chopper performances and switch losses </span></span></span><span style="font-family:Verdana;"><span style="font-family:Verdana;"><span style="font-family:Verdana;">is</span></span></span><span style="font-family:Verdana;"><span style="font-family:Verdana;"><span style="font-family:Verdana;"> derived, and a simulation model using Matlab/ Simulink platforms is conducted to follow the chopper behaviors. Simulation results for concreteSUNPOWER panel type SPR-315E-WHT-D with 315 Watts peak indicates that during the daylight time transistors</span></span></span><span><span><span style="font-family:""> </span></span></span><span style="font-family:Verdana;"><span style="font-family:Verdana;"><span style="font-family:Verdana;">are exposed to complicated change</span></span></span><span st展开更多
相比于传统的PI控制,模型预测控制（model predictive control,MPC）具有动态响应快、避免调整控制参数,以及可增加系统约束等优点,因此被广泛应用到电力电子控制领域。然而,系统模型参数的不匹配通常会导致控制系统产生稳态误差,对于Bo...相比于传统的PI控制,模型预测控制（model predictive control,MPC）具有动态响应快、避免调整控制参数,以及可增加系统约束等优点,因此被广泛应用到电力电子控制领域。然而,系统模型参数的不匹配通常会导致控制系统产生稳态误差,对于Boost变换器电流控制尤为严重。因此,该文针对Boost变换器提出一种简单有效的模型预测控制方法,可解决因未知的电感电阻和输入电压引起的模型不匹配问题,并且只需一步预测即可实现控制目标。另外,所提出的方法是属于连续控制集模型预测控制（continuouscontrol set model predictive control,CCS-MPC）,使用固定的开关频率。仿真和实验结果证明了所提出方法的有效性。展开更多
文摘针对直升机时间域瞬变电磁(helicopter transient electromagnetic,HTEM)发射系统对电流响应快速跟踪的技术需求,提出一种基于Boost拓扑电路的峰值电流数字预测控制算法.通过采样当前开关周期的输入电压、输出电压和电感电流,预测下一个开关周期结束时刻的电感电流,进而推导出占空比,使电感电流在一个开关响应周期实现对参考值的跟踪,提高电流的瞬态响应速度,并通过伯德图对闭环系统的稳定性和快速性进行分析.控制算法不仅简单,而且易于在数字信号处理器(digital signal processors,DSP)上实现.最后,通过软件仿真和实验对提出的控制算法进行了验证.
文摘<span style="font-family:Verdana;">This paper investigates the behaviors of Boost DC Chopper used in Photovoltaic energy systems where the solar irradiation changes during the day time causing current and voltage changes. Varying the solar irradiation causes output chopper voltage changes in order to keep working at maximum extracted solar power. The chopper voltage changes leading to variable duty cycle operation of chopper switch and causes </span><span style="font-family:Verdana;"><span style="font-family:Verdana;"><span style="font-family:Verdana;">a </span></span></span><span style="font-family:Verdana;"><span style="font-family:Verdana;"><span style="font-family:Verdana;">significant change in switch losses in terms of the dissipated power. In addition to that the chopper behaviors are studied when the chopper voltage is boosting up to a predetermined reference value leading to </span></span></span><span style="font-family:Verdana;"><span style="font-family:Verdana;"><span style="font-family:Verdana;">a </span></span></span><span style="font-family:Verdana;"><span style="font-family:Verdana;"><span style="font-family:Verdana;">significant change in chopper current, voltage, duty cycle and occurred losses. A mathematical model for chopper performances and switch losses </span></span></span><span style="font-family:Verdana;"><span style="font-family:Verdana;"><span style="font-family:Verdana;">is</span></span></span><span style="font-family:Verdana;"><span style="font-family:Verdana;"><span style="font-family:Verdana;"> derived, and a simulation model using Matlab/ Simulink platforms is conducted to follow the chopper behaviors. Simulation results for concreteSUNPOWER panel type SPR-315E-WHT-D with 315 Watts peak indicates that during the daylight time transistors</span></span></span><span><span><span style="font-family:""> </span></span></span><span style="font-family:Verdana;"><span style="font-family:Verdana;"><span style="font-family:Verdana;">are exposed to complicated change</span></span></span><span st
文摘相比于传统的PI控制,模型预测控制（model predictive control,MPC）具有动态响应快、避免调整控制参数,以及可增加系统约束等优点,因此被广泛应用到电力电子控制领域。然而,系统模型参数的不匹配通常会导致控制系统产生稳态误差,对于Boost变换器电流控制尤为严重。因此,该文针对Boost变换器提出一种简单有效的模型预测控制方法,可解决因未知的电感电阻和输入电压引起的模型不匹配问题,并且只需一步预测即可实现控制目标。另外,所提出的方法是属于连续控制集模型预测控制（continuouscontrol set model predictive control,CCS-MPC）,使用固定的开关频率。仿真和实验结果证明了所提出方法的有效性。
