Data Logging and Control of a Remote Inverter Using LoRa and Power Line Communication

For decades, the power system was highly centralized. With the growing integration of distributed generations into the system, there is a necessity for bi-directional communication methods to monitor and control the remote assets. The primary objective of this paper is to develop a communication link for monitoring and controlling a grid-connected inverter in a remote location. Furthermore, the paper presents developments that have been incorporated to improve the communication link. The literature survey indicates that LoRa is superior compared to other technologies, but has some security and reliability issues. This paper also presents an encryption algorithm to improve the security of the LoRa link. Local data storage added to the system before transmitting data increases the system reliability. A display at the transmission end is added to improve the user-friendliness of the communication link. A Powerline Communication link is parallelly added to the LoRa link to improve the reliability. Finally, tests are conducted with an actual inverter and the results are presented. The tests show that the developed communication link has improved security and reliability, while its open nature makes it highly scalable and adaptable for employment in other smart grid applications.

Integrated Power and Single Axis Attitude Control System with Two Flywheels

The existing research of the integrated power and attitude control system（IPACS） in satellites mainly focuses on the IPACS concept,which aims at solving the coupled problem between the attitude control and power tracking.In the IPACS,the configuration design of IPACS is usually not considered,and the coupled problem between two flywheels during the attitude control and energy storage has not been resolved.In this paper,an integrated power and single axis attitude control system using two counter rotating magnetically suspended flywheels mounted to an air table is designed.The control method of power and attitude control using flywheel is investigated and the coupling problem between energy storage and attitude control is resolved.A computer simulation of an integrated power and single axis attitude control system with two flywheels is performed,which consists of two counter rotating magnetically suspended flywheels mounted to an air rotary table.Both DC bus and a single axis attitude are the regulation goals.An attitude ＆ DC bus coordinator is put forward to separate DC bus regulation and attitude control problems.The simulation results of DC bus regulation and attitude control are presented respectively with a DC bus regulator and a simple PD attitude controller.The simulation results demonstrate that it is possible to integrate power and attitude control simultaneously for satellite using flywheels.The proposed research provides theory basis for design of the IPACS.

Remote Sensing Image Deblurring Based on Grid Computation

In general, there is a demand for real-time processing of mass quantity remote sensing images. However, the task is not only data-intensive but also computating-intensive. Distributed processing is a hot topic in remote sensing processing and image deblurring is also one of the most important needs. In order to satisfy the demand for quick proc- essing and deblurring of mass quantity satellite images, we developed a distributed, grid computation-based platform as well as a corresponding middleware for grid computation. Both a constrained power spectrum equalization algorithm and effective block processing measures, which can avoid boundary effect, were applied during the processing. The re- sult is satisfactory since computation efficiency and visual effect were greatly improved. It can be concluded that the technology of spatial information grids is effective for mass quantity remote sensing image processing.

AN EXPERT SYSTEM ASSISTING DECISION-MAKING OF STEADY-STATE SECURITY CONTROL

An expert system of steady-state security control for assisting dispatchers indecision-making is proposed.It is a mixture of logical inference,empirical rules and nu-merical algorithms,and aimed only at real power subproblem.The classification of pro-duction rules and structure,and the realization and improvement of this system are dis-cussed in detail.The expert system was demonstrated and evaluated on Micro-Vax Ⅱ forIEEE-30 bus sample system and a practical JS-95 bus system.

Adaptive Fuzzy Logic Controller for Harmonics Mitigation Using Particle Swarm Optimization

An excessive use of non-linear devices in industry results in current harmonics that degrades the power quality with an unfavorable effect on power system performance.In this research,a novel control techniquebased Hybrid-Active Power-Filter(HAPF)is implemented for reactive power compensation and harmonic current component for balanced load by improving the Power-Factor(PF)and Total–Hormonic Distortion(THD)and the performance of a system.This work proposed a soft-computing technique based on Particle Swarm-Optimization(PSO)and Adaptive Fuzzy technique to avoid the phase delays caused by conventional control methods.Moreover,the control algorithms are implemented for an instantaneous reactive and active current(Id-Iq)and power theory(Pq0)in SIMULINK.To prevent the degradation effect of disturbances on the system’s performance,PS0-PI is applied in the inner loop which generate a required dc link-voltage.Additionally,a comparative analysis of both techniques has been presented to evaluate and validate the performance under balanced load conditions.The presented result concludes that the Adaptive Fuzzy PI controller performs better due to the non-linearity and robustness of the system.Therefore,the gains taken from a tuning of the PSO based PI controller optimized with Fuzzy Logic Controller(FLC)are optimal that will detect reactive power and harmonics much faster and accurately.The proposed hybrid technique minimizes distortion by selecting appropriate switching pulses for VSI(Voltage Source Inverter),and thus the simulation has been taken in SIMULINK/MATLAB.The proposed technique gives better tracking performance and robustness for reactive power compensation and harmonics mitigation.As a result of the comparison,it can be concluded that the PSO-basedAdaptive Fuzzy PI system produces accurate results with the lower THD and a power factor closer to unity than other techniques.

Computational mission analysis and conceptual system design for super low altitude satellite

This paper deals with system engineering and design methodology for super low altitude satel ites in the view of the com-putational mission analysis. Due to the slight advance of imaging instruments, such as the focus of camera and the image element of charge coupled device （CCD）, it is an innovative and economical way to improve the camera’s resolution to enforce the satel ite to fly on the lower altitude orbit. DFH-3, the mature satel ite bus de-veloped by Chinese Academy of Space Technology, is employed to define the mass and power budgets for the computational mis-sion analysis and the detailed engineering design for super low altitude satel ites. An effective iterative algorithm is proposed to solve the ergodic representation of feasible mass and power bud-gets at the flight altitude under constraints. Besides, boundaries of mass or power exist for every altitude, where the upper boundary is derived from the maximum power, while the minimum thrust force holds the lower boundary before the power reaching the initial value. What’s more, an analytical algorithm is employed to numerical y investigate the coverage percentage over the altitude, so that the nominal altitude could be selected from al the feasi-ble altitudes based on both the mass and power budgets and the repetitive ground traces. The local time at the descending node is chosen for the nominal sun-synchronous orbit based on the average evaluation function. After determining the key orbital ele-ments based on the computational mission analysis, the detailed engineering design on the configuration and other subsystems, like power, telemetry telecontrol and communication （TT＆amp;C）, and attitude determination and control system （ADCS）, is performed based on the benchmark bus, besides, some improvements to the bus are also implemented to accommodate the flight at a super low altitude. Two operation strategies, drag-free closed-loop mode and on/off open-loop mode, are presented to maintain the satel-lite’s altitude. Final y, a flight planning schedule for the satel ite is demonstrated from its launch into the initial altitude at the very beginning to its decay to death in the end.

Experimental Study on Cloud-Computing-Based Electric Power SCADA System

With the development of smart grid, the electric power supervisory control and data acquisition （SCADA） system is limited by the traditional IT infrastructure, leading to low resource utilization and poor scalability. Information islands are formed due to poor system interoperability. The development of innovative applications is limited, and the launching period of new businesses is long. Management costs and risks increase, and equipment utilization declines. To address these issues, a professional private cloud solution is introduced to integrate the electric power SCADA system, and conduct experimental study of its applicability, reliability, security, and real time. The experimental results show that the professional private cloud solution is technical and commercial feasible, meeting the requirements of the electric power SCADA system.

基于PLC构建电力巡检机器人自动化控制系统

该文对电力巡检机器人的自动化控制系统进行以PLC为基础的设计,提升电力调度的效率与安全性。基于PLC构建电力巡检机器人自动化控制系统总体架构,通过上位机接收操纵台传递的操作者信息以及下位机传递的温度、角度等状态信息,通过OPC通信程序将指令下发至下位机,下位机依据上位机下达指令,通过PID驱动控制器完成电力巡检机器人运动控制,利用模糊C均值聚类方法判别电力巡检机器人故障,将结果实时传送到上位机操纵台的显示器,及时反馈机器人的工作状态。实验结果表明,该系统可以控制机器人完成电力巡检,该系统应用后可有效检测机器人故障,使其具备优秀的避障能力,可实现上下位机实时通信。

水电厂无人值班模式下ONCALL报警系统设计与实现

主要介绍在大型水电厂“无人值班(少人值守)”模式下,基于水电厂计算机监控系统进行扩展的ONCALL报警系统的总体结构、软件设计原则及系统功能。该ONCALL报警系统以互联网设计方式、采用模块化的设计思想,通过高及时性高可靠性的智能报警模块,信息综合管理系统模块,信息发布模块,依据水电厂管理的业务规范和管理流程,将电厂内部各生产管理系统所产生的信息进行汇总、分类、分级,再准确、实时发布到相关信息接收人员的信息接收终端上。并通过在G电厂的实际应用过程中出现的问题开展分析并提出相应的改进措施。

具备黑启动和构网能力的远海风电经DRU-MMC送出方案

由于具有成本低、体积重量小和可靠性高等特点,送端采用二极管整流器(DRU)、受端采用模块化多电平换流器(MMC)的送出方案在远海风电送出领域备受关注。鉴于DRU不能构建交流电网且无法倒送有功功率,文中提出一种具备黑启动和构网能力的远海风电经DRU-MMC送出方案。所提方案在DRU-MMC送出技术的基础上增加了常规小容量电压源型辅助换流器、耗能单元和必要的快速开关,通过直流海缆复用和快速开关倒闸重构拓扑,分别构建黑启动电源低压回路和风电传输高压回路,实现黑启动和功率传输2种工况在线切换;提出辅助换流器在不同运行阶段的构网控制策略,解决海上交流电网构建、DRU无功补偿和谐波抑制等问题,消除DRU-MMC送出方案对风电场类型的限制。最后,通过经济性分析和算例仿真,验证了所提方案的优越性和有效性。

基于云计算的农业机器人远程实时控制系统研究

首先,介绍了农业机器人软硬件平台,建立了其移动模型;然后,基于云计算设计了远程实时控制系统;最后,实现了农业机器人远程实时控制和通信系统,操作人员可以通过遥操作实现对该机器人的远程控制。实验结果表明:农业机器人能够按照操作指令从起点A行走到终点B,且系统具有延迟低、灵活性较好等优点,具备一定的可靠性和可行性。

结合GPS和LBS技术的计算机远程遥控方法

针对复杂环境中建筑物和遮挡物对计算机远程遥控的干扰,为提高覆盖范围,提出结合GPS和LBS技术的计算机远程遥控方法。分析计算机远程遥控系统组成,32位STM32F103ZET6微控制器主控,结合通信组件与遥控主体实现远程操控及实时动态反馈。结合GPS和LBS技术,利用RSSI定位技术辅助WIFI网络定位,通过服务器计算并存储远程遥控目标位置信息,实现快速准确的定位功能。构建目标运行轨迹规划模型,旨在通过优化方法,在目标运行范围内规划最优轨迹点,以最小化运行距离和高度为代价,同时考虑运行限制和干扰规范,确保目标安全高效地运行。实验表明,该方法能稳定可靠地实现无人机目标的计算机远程遥控,在实际应用中鲁棒性和适应性良好,异常情况下可快速恢复并保持较高控制精度。

基于电力载波与云计算的视频监控系统设计

针对目前视频监控系统不断升级改造存在的布线工作量大、布线成本高、无法存储及计算海量视频文件的问题,该文提出基于电力载波技术和云计算框架的视频监控系统。视频数据经过调制解调、振荡、放大、耦合等过程,利用电力线网络传输到各分控点,通过互联网传送到云端,利用云端强大的存储、计算能对视频数据进行各种处理。设计中硬件部分的ARM11微处理器主要负责视频数据的采集、编码并封包传送到PLC调制解调模块,完成数据收发控制和系统任务调度。软件部分主要包括开发系统搭建、USB摄像头驱动、视频数据采集、LCD实时显示、网络传输和双核数据处理等。该文的设计充分结合电力载波和云计算的特点,在视频监控领域中具有较高的应用价值。

基于光纤通信技术的电力系统远程监测与控制研究

随着电网规模的扩大和运行复杂性的增加,传统铜缆通信系统在处理大规模数据时存在局限性。光纤通信凭借高速、大容量和强大的抗干扰能力等独特优势,为电力系统的远程监测与控制提供了新的解决方案。光纤通信技术可提高数据处理和传输效率,增强电网动态变化的实时响应能力,为电力系统的稳定运行提供坚实的技术支撑。文章探讨了基于光纤通信技术的电力系统远程监测与控制的结构,对比分析传统方法与基于光纤通信技术的方法。实验测试结果表明,基于光纤通信技术的方法在信噪比、带宽利用率、响应时间、数据准确性、故障检测时间以及系统稳定性等关键指标方面均有良好表现,推动了电力系统远程监测与控制的发展。

综合控制系统无法遥控加电故障处置方法研究

本文针对某型舰炮在执行任务过程中出现的综合控制系统无法遥控加电故障,分析了控制系统与舰炮装置之间的电路原理,厘清了不同功能电路之间的信号控制关系,运用故障树分析法形成故障点定位方案,结合实践工作经验提出应急处置方法,以期指导操作手迅速完成对该类故障的应急处置,确保设备及时恢复正常状态。

针对边缘计算的低功耗通信优化方法研究

文章针对边缘计算环境下ZigBee通信的低功耗优化问题,提出一种基于动态功率控制的方法。主要介绍边缘计算的常见架构和ZigBee通信的基本原理,详细阐述自适应功率控制模型和,通过在MATLAB中进行仿真实验,分析不同发送功率和通信距离下的通信质量和能耗表现。实验结果显示,基于动态功率控制的ZigBee通信优化方法能够实现较高的通信质量和较低的能耗,相比传统ZigBee通信具有明显的优势。

具有数据流和视频流的Internet的远程控制系统

提出了基于Internet的远程控制系统方案,能够在异地控制被控对象,通过数据流和视频流监控对象的运行状况。介绍了其硬件系统和软件系统的构成,讨论了远程控制系统中采用的通信技术。实验结果表明了该系统的可靠性和较高的实用价值。

基于Android平台的智能家居系统设计

为了实现家居生活智能、方便等目的,提出一种基于Android平台的智能家居系统。采用内外网通信方式,使得当家庭宽带不可用时仍能通过内网实现对家居设备的控制。将用户配置信息、设备信息存在网关使得不同客户端能信息共享,实现动态添加、删除动作。采用推送而不是轮询,实时性好。客户端APP功能齐全,云计算的使用实现了外网控制,同时便于未来的系统扩展。

基于Android移动设备传感器的体感应用

普适计算下的情景感知已被广泛应用.为了利用Android移动设备成熟的传感器技术来实现体感操作,文中基于Android移动设备设计了新颖的体感应用系统.该系统利用中间件技术实现了Android移动设备与服务器之间的通信,包括有效识别数据的传输、用户操作的模式识别和动作数据的量化;同时,系统通过传感器获取模拟数据并转换为相应的数字执行命令,从而实现Android手机传感器的开发.实验结果表明,该应用系统具有控制精准、能耗较低、能应用于不同场景等特点.

改进反激拓扑模式下远端稳压电源控制方案

为提高远端稳压电源的供电质量,最大限度的在高可靠性前提下保证发射设备输出电压快速、平稳地达到设定值,提出一种改进反激拓扑模式下远端稳压电源设计方式,并建立相应数学模型。设计了前置论域整定的模糊比例积分微分(PID)控制算法,通过论域整定模型将模糊PID参数直接映射到模糊规则下,消除试凑法偶然性的同时消除了量化因子对误差的放大作用,有效地避免了过度调整的现象;引用模糊逻辑来实时处理远端稳压电源的动态参量值,并根据反模糊映射函数将生成的量化值映射到控制元件。仿真环境模拟结果表明:与模糊PID控制相比,前置论域整定的模糊PID控制算法具有优良稳态性能,调节时间缩短48.1%,响应时间缩短了28.6%并降低到1.4 ms;与此同时,该控制方案能够有效地抵抗突发性干扰,稳压输出时间缩短了45.5%,响应时间缩短到37.5%。实验结果表明:前置整定模糊PID控制算法可以运用到实际工业环境中,与工业环境下传统控制算法比,前置整定模糊PID控制算法可以大幅提高远端稳压电源的供电质量,具备优良的鲁棒性。