在输电网中装设晶闸管控制串联电容器(Thyristor controlled series capacitor,TCSC)可以减少传输损耗,增加输电容量,并改善电压质量。本文介绍了晶闸管开关串联电容器在电力系统输电网络中的应用。将TCSC串联安装在输电线路的两个位置...在输电网中装设晶闸管控制串联电容器(Thyristor controlled series capacitor,TCSC)可以减少传输损耗,增加输电容量,并改善电压质量。本文介绍了晶闸管开关串联电容器在电力系统输电网络中的应用。将TCSC串联安装在输电线路的两个位置,在有TCSC的情况下,对输电网系统的性能进行了研究,研究了不同类型的电力系统干扰,如发电机出口电压的波动、负载的切除、发电机的停电和电网同步,以及电压、潮流和阻抗等参数。并且在MATLAB/Simulink中对所研究的系统进行仿真,并对TCSC结合的测试系统进行了验证,仿真结果验证了输电网装设TCSC装置的有效性。展开更多
提出了一种基于晶闸管控制的串连电容器(thyristor controlled series capacitor,TCSC)技术和粒子群优化算法的电力系统阻塞疏导方法。首先根据线路灵敏度分析确定安装TCSC的线路;然后提出了电力市场环境下电网中含有TCSC装置的阻塞疏...提出了一种基于晶闸管控制的串连电容器(thyristor controlled series capacitor,TCSC)技术和粒子群优化算法的电力系统阻塞疏导方法。首先根据线路灵敏度分析确定安装TCSC的线路;然后提出了电力市场环境下电网中含有TCSC装置的阻塞疏导计算数学模型;最后运用粒子群优化算法对这一数学模型进行参数优化,达到疏导电网阻塞的目的。IEEE14节点系统算例表明,基于TCSC技术进行电网阻塞疏导是有效、合理的。展开更多
A soil temperature control system was designed for sapling study in alpine region and tested in summer, 2009. The system consisted of a power switch, voltage regulator, microcomputer timer, safety relays, temperature ...A soil temperature control system was designed for sapling study in alpine region and tested in summer, 2009. The system consisted of a power switch, voltage regulator, microcomputer timer, safety relays, temperature control device, temperature sensors, heating cables, fireproofing plastic pipes (PVC), 108 heavy-duty plastic containers and seedlings. The heating cables were held in six 2-layer PVC frames with 25 cm wide, 320 cm long and 25 cm high and three 1-layer frames with 25 cm wide and 320 cm long for 15°C soil temperature treatment, half of the 2-layer frames were used for 20°C and 25°C soil temperature treatments, respectively. Each of the frames was installed at each of ditches with 30 cm wide, 330 cm long and 30 cm deep in size. 12 seedling containers with 20 cm top diameter, 18cm bottom diameter and 25 cm high were homogenously placed at each of the ditches, and spaces between the containers were filled with natural soil. The system was economic, and could increase soil temperatures obviously and uniformly, the maximal and minimal standard errors of soil temperatures were ±0.28 and ±0.05°C at 10cm depth in the containers within each of all the ditches. In the system, aboveground environment was natural, diurnal and monthly soil temperatures varied with changing air temperature, the research results may be better to know the eco-physiological and growth responses of alpine saplings/seedlings to soil warming than that in greenhouse, laboratory, infrared heat lamp and open top chamber.展开更多
Valuable mineral resources are widely distributed throughout the seabed. autonomous underwater vehicles (AUVs) are preferable to remotely-operated vehicles (ROVs) when probing for such mineral resources as the extensi...Valuable mineral resources are widely distributed throughout the seabed. autonomous underwater vehicles (AUVs) are preferable to remotely-operated vehicles (ROVs) when probing for such mineral resources as the extensive exploration area makes it difficult to maintain contact with operators. AUVs depend on batteries, so their power consumption should be reduced to extend exploration time. Power for conventional marine instrument systems is incorporated in their waterproof sealing. External intermittent control of this power source until termination of exploration is challenging due to limitations imposed by the underwater environment. Thus, the AUV must have a power control system that can improve performance and maximize use of battery capacity. The authors developed such a power control system with a three-step algorithm. It automatically detects underwater operational states and can limit power, effectively decreasing power consumption by about 15%.展开更多
An observer-based fault diagnosis method and a fault tolerant control for open-switch fault and current sensor fault are proposed for interleaved flyback converters of a micro-inverter system. First, based on the topo...An observer-based fault diagnosis method and a fault tolerant control for open-switch fault and current sensor fault are proposed for interleaved flyback converters of a micro-inverter system. First, based on the topology of a grid-connected micro-inverter, a mathematical model of the flyback converters is established. Second, a state observer is applied to estimate the currents online and generate corresponding residuals. The fault is diagnosed by comparing the residuals with the thresholds. Finally, a fault-tolerant control that consists of a fault-tolerant topology for the faulty switch and a simple software redundancy control for the faulty current sensor, is proposed to achieve a fault-tolerant operation. The feasibility and effectiveness of the proposed method has been verified by simulation and experimental results.展开更多
文摘在输电网中装设晶闸管控制串联电容器(Thyristor controlled series capacitor,TCSC)可以减少传输损耗,增加输电容量,并改善电压质量。本文介绍了晶闸管开关串联电容器在电力系统输电网络中的应用。将TCSC串联安装在输电线路的两个位置,在有TCSC的情况下,对输电网系统的性能进行了研究,研究了不同类型的电力系统干扰,如发电机出口电压的波动、负载的切除、发电机的停电和电网同步,以及电压、潮流和阻抗等参数。并且在MATLAB/Simulink中对所研究的系统进行仿真,并对TCSC结合的测试系统进行了验证,仿真结果验证了输电网装设TCSC装置的有效性。
文摘提出了一种基于晶闸管控制的串连电容器(thyristor controlled series capacitor,TCSC)技术和粒子群优化算法的电力系统阻塞疏导方法。首先根据线路灵敏度分析确定安装TCSC的线路;然后提出了电力市场环境下电网中含有TCSC装置的阻塞疏导计算数学模型;最后运用粒子群优化算法对这一数学模型进行参数优化,达到疏导电网阻塞的目的。IEEE14节点系统算例表明,基于TCSC技术进行电网阻塞疏导是有效、合理的。
基金supported by the National Natural Science Foundation of China (Grant No. 30872000 and 41071203)partially supported by the Project of Knowledge Innovation, Chinese Academy of Sciences (No. KZXZ-YW-33)Sichuan Foundation of Excellent Young Scientists (No. 2010JQ0026)
文摘A soil temperature control system was designed for sapling study in alpine region and tested in summer, 2009. The system consisted of a power switch, voltage regulator, microcomputer timer, safety relays, temperature control device, temperature sensors, heating cables, fireproofing plastic pipes (PVC), 108 heavy-duty plastic containers and seedlings. The heating cables were held in six 2-layer PVC frames with 25 cm wide, 320 cm long and 25 cm high and three 1-layer frames with 25 cm wide and 320 cm long for 15°C soil temperature treatment, half of the 2-layer frames were used for 20°C and 25°C soil temperature treatments, respectively. Each of the frames was installed at each of ditches with 30 cm wide, 330 cm long and 30 cm deep in size. 12 seedling containers with 20 cm top diameter, 18cm bottom diameter and 25 cm high were homogenously placed at each of the ditches, and spaces between the containers were filled with natural soil. The system was economic, and could increase soil temperatures obviously and uniformly, the maximal and minimal standard errors of soil temperatures were ±0.28 and ±0.05°C at 10cm depth in the containers within each of all the ditches. In the system, aboveground environment was natural, diurnal and monthly soil temperatures varied with changing air temperature, the research results may be better to know the eco-physiological and growth responses of alpine saplings/seedlings to soil warming than that in greenhouse, laboratory, infrared heat lamp and open top chamber.
文摘Valuable mineral resources are widely distributed throughout the seabed. autonomous underwater vehicles (AUVs) are preferable to remotely-operated vehicles (ROVs) when probing for such mineral resources as the extensive exploration area makes it difficult to maintain contact with operators. AUVs depend on batteries, so their power consumption should be reduced to extend exploration time. Power for conventional marine instrument systems is incorporated in their waterproof sealing. External intermittent control of this power source until termination of exploration is challenging due to limitations imposed by the underwater environment. Thus, the AUV must have a power control system that can improve performance and maximize use of battery capacity. The authors developed such a power control system with a three-step algorithm. It automatically detects underwater operational states and can limit power, effectively decreasing power consumption by about 15%.
基金Project(2012AA051601)supported by the High-Tech Research and Development Program of China
文摘An observer-based fault diagnosis method and a fault tolerant control for open-switch fault and current sensor fault are proposed for interleaved flyback converters of a micro-inverter system. First, based on the topology of a grid-connected micro-inverter, a mathematical model of the flyback converters is established. Second, a state observer is applied to estimate the currents online and generate corresponding residuals. The fault is diagnosed by comparing the residuals with the thresholds. Finally, a fault-tolerant control that consists of a fault-tolerant topology for the faulty switch and a simple software redundancy control for the faulty current sensor, is proposed to achieve a fault-tolerant operation. The feasibility and effectiveness of the proposed method has been verified by simulation and experimental results.
