The downlink energy-efficient transmission schedule with non-ideal circuit power over Wreless networks involving a single transmitter and multiple receivers was investigated. According to the special structure of the ...The downlink energy-efficient transmission schedule with non-ideal circuit power over Wreless networks involving a single transmitter and multiple receivers was investigated. According to the special structure of the problem, a novel algorithm called OOSCPMR （the optimal offine scheduling with non-ideal circuit power for multi-receivers） is proposed, and the optimal offine solutions to optimize the energy- efficient transmission policy are found. The packets to be transmitted can be divided into two types where one type of packet is determined to be transmitted using the enrgy- efficient tansmission time, and the other type of packet is determined by the ID moveright algorithm. Finally, an energy-efficient online schedule is developed based on te proposed OOSCPMR algoriAm. Simulation results show that the optima offline transmission schedule provides te lower bound performance for the online tansmission schedule. The proposed optimal offline and online policy is more energy efficient than the existing schemes tat assume ideal circuit power.展开更多
The blue-green light in the 450 nm to 550 nm band is usually used in underwater wireless optical communication (UWOC). The blue-green light transmission in seawater is scattered by the seawater effect and can achieve ...The blue-green light in the 450 nm to 550 nm band is usually used in underwater wireless optical communication (UWOC). The blue-green light transmission in seawater is scattered by the seawater effect and can achieve communication in non-line-of-sight (NLOS) transmission mode. Compared to line-of-sight (LOS) transmission, NLOS transmission does not require alignment and can be adapted to various underwater environments. The scattering coefficients of seawater at different depths are different, which makes the scattering of light in different depths of seawater different. In this paper, the received optical power and bit error rate (BER) of the photodetector (PD) were calculated when the scattering coefficients of blue-green light in seawater vary from large to small with increasing depth for NLOS transmission. The results show that blue-green light in different depths of seawater in the same way NLOS communication at the same distance, the received optical power and BER at the receiver are different, and the received optical power of green light is greater than that of blue light. Increasing the forward scattering coverage of the laser will suppress the received optical power of the PD, so when performing NLOS communication, appropriate trade-offs should be made between the forward scattering coverage of the laser and the received optical power.展开更多
This paper analyzes the power markets both in northwest sending end and, east receiving ends, points out the favorable and unfavorable conditions for power development In, the northwest area, brings forward,the develo...This paper analyzes the power markets both in northwest sending end and, east receiving ends, points out the favorable and unfavorable conditions for power development In, the northwest area, brings forward,the development planning of power sources and power network constructions, and presents the benefit estimation of sending power from northwest to east.展开更多
由于新能源发电设备的弱支撑性,新能源高占比的受端电网的电压支撑强度难以满足系统安全稳定运行的要求。为了解决现有静止无功发生器(static var generator,SVG)配置方法未能充分提升系统小干扰电压稳定性和暂态电压稳定性的问题,提出...由于新能源发电设备的弱支撑性,新能源高占比的受端电网的电压支撑强度难以满足系统安全稳定运行的要求。为了解决现有静止无功发生器(static var generator,SVG)配置方法未能充分提升系统小干扰电压稳定性和暂态电压稳定性的问题,提出了一种综合考虑系统小干扰电压稳定和暂态电压稳定的SVG优化配置方法。首先,在第一阶段考虑SVG投资运行总成本和系统小干扰电压稳定裕度,在第二阶段引入SVG接入对系统故障后暂态电压稳定裕度的影响。然后,利用基于组合赋权法和相对熵距离的改进理想解法得到最优配置方案。最后,应用PSDBPA对新能源高占比受端电网算例进行分析,验证了所提配置方法能充分发挥SVG对系统电压稳定的提升作用。展开更多
基金The National Natural Science Foundation of China(No.61571123,61521061)the National Science and Technology Major Project(No.2016ZX03001011-005)+1 种基金the Research Fund of National Mobile Communications Research Laboratory of Southeast University(No.2017A03)Qing Lan Project
文摘The downlink energy-efficient transmission schedule with non-ideal circuit power over Wreless networks involving a single transmitter and multiple receivers was investigated. According to the special structure of the problem, a novel algorithm called OOSCPMR （the optimal offine scheduling with non-ideal circuit power for multi-receivers） is proposed, and the optimal offine solutions to optimize the energy- efficient transmission policy are found. The packets to be transmitted can be divided into two types where one type of packet is determined to be transmitted using the enrgy- efficient tansmission time, and the other type of packet is determined by the ID moveright algorithm. Finally, an energy-efficient online schedule is developed based on te proposed OOSCPMR algoriAm. Simulation results show that the optima offline transmission schedule provides te lower bound performance for the online tansmission schedule. The proposed optimal offline and online policy is more energy efficient than the existing schemes tat assume ideal circuit power.
文摘The blue-green light in the 450 nm to 550 nm band is usually used in underwater wireless optical communication (UWOC). The blue-green light transmission in seawater is scattered by the seawater effect and can achieve communication in non-line-of-sight (NLOS) transmission mode. Compared to line-of-sight (LOS) transmission, NLOS transmission does not require alignment and can be adapted to various underwater environments. The scattering coefficients of seawater at different depths are different, which makes the scattering of light in different depths of seawater different. In this paper, the received optical power and bit error rate (BER) of the photodetector (PD) were calculated when the scattering coefficients of blue-green light in seawater vary from large to small with increasing depth for NLOS transmission. The results show that blue-green light in different depths of seawater in the same way NLOS communication at the same distance, the received optical power and BER at the receiver are different, and the received optical power of green light is greater than that of blue light. Increasing the forward scattering coverage of the laser will suppress the received optical power of the PD, so when performing NLOS communication, appropriate trade-offs should be made between the forward scattering coverage of the laser and the received optical power.
文摘This paper analyzes the power markets both in northwest sending end and, east receiving ends, points out the favorable and unfavorable conditions for power development In, the northwest area, brings forward,the development planning of power sources and power network constructions, and presents the benefit estimation of sending power from northwest to east.
文摘由于新能源发电设备的弱支撑性,新能源高占比的受端电网的电压支撑强度难以满足系统安全稳定运行的要求。为了解决现有静止无功发生器(static var generator,SVG)配置方法未能充分提升系统小干扰电压稳定性和暂态电压稳定性的问题,提出了一种综合考虑系统小干扰电压稳定和暂态电压稳定的SVG优化配置方法。首先,在第一阶段考虑SVG投资运行总成本和系统小干扰电压稳定裕度,在第二阶段引入SVG接入对系统故障后暂态电压稳定裕度的影响。然后,利用基于组合赋权法和相对熵距离的改进理想解法得到最优配置方案。最后,应用PSDBPA对新能源高占比受端电网算例进行分析,验证了所提配置方法能充分发挥SVG对系统电压稳定的提升作用。
