介绍了铅酸蓄电池的经典一阶模型及充放电电路的拓扑结构,并分别研究了有功和无功功率(PQ)源和V/f源储能系统下双向变流器的控制方式。结合西藏尼玛县可再生能源局域网建设项目背景,针对初期西藏尼玛县现场V/f源因过充或过放导致微电网...介绍了铅酸蓄电池的经典一阶模型及充放电电路的拓扑结构,并分别研究了有功和无功功率(PQ)源和V/f源储能系统下双向变流器的控制方式。结合西藏尼玛县可再生能源局域网建设项目背景,针对初期西藏尼玛县现场V/f源因过充或过放导致微电网溃网情况,提出一种基于孤岛模式下储能蓄电池的荷电状态SOC(State of Charge)稳定的控制策略,即控制V/f源下的蓄电池SOC在阈值附近小幅度波动,从而保持蓄电池小功率的充放电。基于EMTDC/PSCAD软件对系统进行仿真,结果表明了该控制策略的有效性,为孤岛模式下微电网的稳定运行提供了一种很好的解决方案。展开更多
The paper discusses the application of PWM delta modulation with PI controller as an alternative to the standard PWM techniques for providing gating signals to the voltage source inverters. Its inherent characteristic...The paper discusses the application of PWM delta modulation with PI controller as an alternative to the standard PWM techniques for providing gating signals to the voltage source inverters. Its inherent characteristics of constant volts/Hertz control without feedback complexity and boosting of the fundamental voltage makes it an excellent choice for motor drive applications. This paper discusses the comparison between a basic delta modulation, the advanced Delta modulation with PI controller and an optimized DMPI. It is shown that in addition to the aforementioned advantages, VSI with optimized DMPI produces superior load current/voltage waveforms compared to simple DMPI, when IGBT is employed as a switching device for the inverter. Since the tacho feedback or other traditional speed sensing means is not permissible in sealed motor or the pump, a novel method is used to monitor the motor speed from the terminal quantities like voltage, current, and motor input power factor.展开更多
文摘介绍了铅酸蓄电池的经典一阶模型及充放电电路的拓扑结构,并分别研究了有功和无功功率(PQ)源和V/f源储能系统下双向变流器的控制方式。结合西藏尼玛县可再生能源局域网建设项目背景,针对初期西藏尼玛县现场V/f源因过充或过放导致微电网溃网情况,提出一种基于孤岛模式下储能蓄电池的荷电状态SOC(State of Charge)稳定的控制策略,即控制V/f源下的蓄电池SOC在阈值附近小幅度波动,从而保持蓄电池小功率的充放电。基于EMTDC/PSCAD软件对系统进行仿真,结果表明了该控制策略的有效性,为孤岛模式下微电网的稳定运行提供了一种很好的解决方案。
文摘The paper discusses the application of PWM delta modulation with PI controller as an alternative to the standard PWM techniques for providing gating signals to the voltage source inverters. Its inherent characteristics of constant volts/Hertz control without feedback complexity and boosting of the fundamental voltage makes it an excellent choice for motor drive applications. This paper discusses the comparison between a basic delta modulation, the advanced Delta modulation with PI controller and an optimized DMPI. It is shown that in addition to the aforementioned advantages, VSI with optimized DMPI produces superior load current/voltage waveforms compared to simple DMPI, when IGBT is employed as a switching device for the inverter. Since the tacho feedback or other traditional speed sensing means is not permissible in sealed motor or the pump, a novel method is used to monitor the motor speed from the terminal quantities like voltage, current, and motor input power factor.
