Research on Grid Planning of Dual Power Distribution Network Based on Parallel Ant Colony Optimization Algorithm

A distribution network plays an extremely important role in the safe and efficient operation of a power grid.As the core part of a power grid’s operation,a distribution network will have a significant impact on the safety and reliability of residential electricity consumption.it is necessary to actively plan and modify the distribution network’s structure in the power grid,improve the quality of the distribution network,and optimize the planning of the distribution network,so that the network can be fully utilized to meet the needs of electricity consumption.In this paper,a distribution network grid planning algorithm based on the reliability of electricity consumption was completed using ant colony algorithm.For the distribution network structure planning of dual power sources,the parallel ant colony algorithm was used to prove that the premise of parallelism is the interactive process of ant colonies,and the dual power distribution network structure model is established based on the principle of the lowest cost.The artificial ants in the algorithm were compared with real ants in nature,and the basic steps and working principle of the ant colony optimization algorithm was studied with the help of the travelling salesman problem(TSP).Then,the limitations of the ant colony algorithm were analyzed,and an improvement strategy was proposed by using python for digital simulation.The results demonstrated the reliability of model-building and algorithm improvement.

Novel design of a compact tunable dual band wireless power transfer(TDB-WPT)system for multiple WPT applications

In this study we present the design and realization of a tunable dual band wireless power transfer(TDB-WPT)coupled resonator system.The frequency response of the tunable band can be controlled using a surface-mounted varactor.The transmitter(Tx)and the receiver(Rx)circuits are symmetric.The top layer contains a feed line with an impedance of 50Ω.Two identical half rings defected ground structures(HR-DGSs)are loaded on the bottom using a varactor diode.We propose a solution for restricted WPT systems working at a single band application according to the operating frequency.The effects of geometry,orientation,relative distance,and misalignments on the coupling coefficients were studied.To validate the simulation results,the proposed TDB-WPT system was fabricated and tested.The system occupied a space of 40 mm×40 mm.It can deliver power to the receiver with an average coupling efficiency of 98%at the tuned band from 817 to 1018 MHz and an efficiency of 95%at a fixed band of 1.6 GHz at a significant transmission distance of 22 mm.The results of the measurements accorded well with those of an equivalent model and the simulation.

Dynamic Power Transmission Using Common RF Feeder with Dual Supply

This paper proposes the design concept of a dynamic charging system for electric vehicles using multiple transmitter coils connected to a common radio frequency(RF)feeder driven by a pair of two power supplies.Using a common RF feeder for multiple transmitter coils reduces the power electronic redundancy compared to a conventional system,where each transmitter coil is individually driven by one switched-mode power supply.Currently,wireless charging of electric vehicles is recommended to operate in the frequency range of 85 kHz and beyond.In this frequency range,the signal wavelength is shorter than about 3.5 km.Therefore,a charging pad longer than several hundred meters is subject to the standing wave effect.In such a case,the voltage significantly varies along the RF feeder,resulting in a variation in the received power level when the receiver moves.Specifically,the received power significantly deteriorates when the receiver is nearby a node of the voltage standing wave.In this paper,we employ a pair of two power sources which are electrically separated by an odd-integer number of the quarter wavelength to drive the RF feeder.As a result,the voltage standing wave generated by one power source is complemented by that of the other,leading to stable received power and transmission efficiency at all the receiver’s positions along with the charging pad.Simulation results at the 85 kHz frequency band verify the output power stabilization effect of the proposed design.It is worth noting that the proposed concept can also be applied to simultaneous wireless information and power transfer(SWIPT)for passive radio frequency identification(RFID)tags by raising the operation frequency to higher industrial,scientific and medical(ISM)bands,e.g.,13.56 MHz and employing similar modulation methods as in the current RFID technology.

Dual Power Allocation Optimization Based on Stackelberg Game in Heterogeneous Network with Hybrid Energy Supplies

In heterogeneous network with hybrid energy supplies including green energy and on-grid energy, it is imperative to increase the utilization of green energy as well as to improve the utilities of users and networks. As the difference of hybrid energy source in stability and economy, thus, this paper focuses on the network with hybrid energy source, and design the utility of each user in the hybrid energy source system from the perspective of stability, economy and environment pollution. A dual power allocation algorithm based on Stackelberg game to maximize the utilities of users and networks is proposed. In addition, an iteration method is proposed which enables all players to reach the Stackelberg equilibrium(SE). Simulation results validate that players can reach the SE and the utilities of users and networks can be maximization, and the green energy can be efficiently used.

Dynamics of a Dual Power-split Transmission Based on Loaded Tooth Contact Analysis

In order to implement the dynamic characteristic of a dual power-split transmission, a dynamic me- chanics model is built. Firstly, according to the method of theoretical analysis of the tooth contact analysis （TCA） and loaded tooth contact analysis （LTCA）, the actual meshing process of each gear pairs is simulated, and the time-varying mesh stiffness excitations are obtained, which can improve the numerical precision. Second- ly, by using the lumped mass method, the bending-torsional coupling three dimensional dynamic model of the dual power-split transmission is established, and the identical dimensionless equations are deduced by elimina- ting the effect of rigid displacement and the method of dimensional normalization. Finally, by the method of the fourth order Runge-Kutta algorithm with variable step lengths, the responses of this system in a frequency domain and time domain are obtained, and the dynamic load change characteristics of each gear pairs are analyzed. The results show that the establishment, solution and analysis of the system dynamics model could provide a basis for the dynamic design, and have an important significance for the dynamic efficiency analysis and dynamic perform- ance optimization design of the dual power-split transmission.

甲醇双燃料动力系统在超大型集装箱船上的应用

详细分析甲醇双燃料系统在超大型集装箱船上的应用,包括系统的设计、运营和维护,以及面临的环境问题和安全挑战。通过对甲醇供给系统、主机配置和发电机配置的技术方案进行分析,阐述甲醇双燃料系统在超大型集装箱船上应用存在的问题,并提出一系列针对性的应对策略,确保该系统安全、高效运行,助力航运业实现绿色转型。

双制式列车接地系统的车-地联合牵引供电计算

为研究双制式列车在不同供电制式区段下的车体环流和车体—轴端电位分布,针对某型双制式列车构建列车接地系统的链式电路模型,并提出车-地一体化的交、直流区段联合牵引供电计算方法;同时,建立列车接地保护电阻优化模型,并分析2种列车接地系统配置方案.以国内某条双制式线路为算例进行仿真验证,研究结果表明:方案1相较方案2,列车的车体—轴端电位最大值降低36.58%~41.04%,车体环流最大值降低18.49%~22.97%;并且在方案1中,头尾车保护电阻设置为20 mΩ,可使列车的车体—轴端电位最大值为1.15 V,车体电流最大值为50.30 A,达到抑制车体—轴端电位的最优效果.该车-地一体化的交、直流区段联合牵引供电计算方法可适用于单一供电制式或者多供电制式列车接地系统的分析.

西门子Force双源CT故障维修案例分析与探讨

西门子Force双源CT属于高端CT,设备整体配置高、性能佳、应用范围广、稳定性好,在医院运行中发挥了巨大作用。由于设备使用量大,故障时有发生,且设备集成程度较高、整体维修难度大。本文详细分析了使用过程中发生的水冷系统、患者检查床、探测器电源3例故障的故障排除过程,并通过更换三通阀、维护升降电机轴承、焊接X10接头解决故障,节省了维修费用,并为同行维修此类故障提供参考。

乘用车双电机冗余电动助力转向系统研究

为了提高电动助力转向系统的安全性以及可靠性,基于乘用车提出一种双电机冗余电动助力转向技术,采用转向执行双助力电机,可以从硬件上实现冗余,避免任意单电机发生故障时导致转向系统的失效,不仅可以满足转向系统对于轻便型、助力跟随性的要求,还可以减轻单个助力电机的负载提高电机的使用寿命。针对提出的问题,介绍了对双电机阻力转向系统整体结构及工作原理,并对其关键零部件进行分析论述。搭建双电机冗余系统仿真模型,双电机电流分配采用“一主一辅”的控制方式,并进行方向盘多种工况仿真验证。针对助力转向出现抖动问题,结合“扫频试验”,设计输出转矩超前滞后补偿方式进行相位校正补偿。通过实车试验验证了该算法的准确性和有效性。实验结果表明双冗余电动助力转向系统极大提高了转向力矩的稳定性,抑制其扰动性,有较好的助力效果,极大提高系统的可靠性和安全性。

功率分配方式对船用双堆燃料电池热管理效果分析

为研究船用双堆质子交换膜燃料电池(PEMFC)功率分配方式、热管理系统布置形式对热管理系统性能影响,基于AMESim软件建立了船用双堆PEMFC系统仿真模型,根据试验数据验证了仿真模型的可靠性。在此基础上,以串联式、并联式与旁通式热管理系统模型为研究对象,研究在变载工况下采用功率平均分配、逐级分配策略对电堆进出口冷却水温差的影响规律,最后比较在功率平均分配策略下3种热管理系统布置形式的性能。结果表明,3种热管理系统中电堆进出口冷却水温差均会在不同程度上受到功率分配策略的影响,在功率平均分配策略下,采用串联式热管理系统布置形式更有利于提高电堆内部温度一致性。

“双碳”目标下新型电力系统PEST-SWOT分析

随着“双碳”目标的提出,中国将加快构建适应新能源比例不断提升的新型电力系统,大力发展低碳能源是实现“双碳”目标的必然路径。首先,研究了“双碳”目标与新型电力系统的耦合关系,分析新型电力系统发展现状;其次,考虑中国新型电力系统所处环境和自身特性,从宏观、微观两个层面,采用PEST-SWOT分析方法,全面分析新型电力系统建设过程中政治、经济、社会、技术方面自身的优劣势,以及面临的机遇与威胁;最后,基于上述分析,在不同发展战略下提出针对性政策建议和有效措施,为新型电力系统建设提供参考和借鉴。

基于单相双旋转移相变压器的高速铁路系统负序补偿方法

针对高速铁路供电系统在高压电网引起的负序问题,该文参考旋转潮流控制器(RPFC)和静止无功补偿器(SVG)结构,提出一种基于单相双旋转移相变压器(S-DRPST)的新型负序补偿拓扑。首先,分析S-DRPST的工作原理并建立其稳态电压源模型。其次,在V/x牵引供电系统应用场景下,提出S-DRPST的负序电流补偿方法,即根据供电臂负载功率计算所需补偿电流表达式,进而得到两台S-DRPST输出电压幅值与相位,通过调节移相角大小实现电网侧电流的平衡。在此基础上,对单台S-DRPST移相角控制进行设计,补偿设备投入前利用柔性合环减小对牵引网的冲击,投入后采取移相角协调变速控制,使得移相角在接近设定值时降低转速,同时根据角度偏差协调转速控制,从而抑制输出电压振荡现象。最后,利用Matlab/Simulink软件搭建牵引供电系统进行仿真验证,在合环场景下将S-DRPST柔性投入牵引网,仅a相供电臂带负载的情况下,电压不平衡度从4.81%降低到了0.05%,在计及供电臂制动状态时不同工况的不平衡电压均被控制在0.1%以下,在牵引负载快速连续变化下S-DRPST能及时响应补偿负序电流,结果表明S-DRPST在高速铁路供电系统中具有良好的负序补偿效果。

“源网荷储”协同助力陕西省新型电力系统建设

“双碳”目标战略背景下,国内电力行业以构建新能源为主体的新型电力系统为目标,积极开展相关研究并探索转型之路。陕西省风光资源丰富的资源禀赋与位于“清洁大送端”的区位优势决定其自身的电力发展路径具有重要的示范意义。以陕西省实际情况为基点,从源网荷储4个环节入手,分析了陕西省电力行业的发展现状与面临的问题,提出了“源网荷储”协同助力新型电力系统建设的思路。电源侧以新能源为主体,传统机组兜底保障为发展目标;电网侧积极向适应高比例新能源并网、多元化负荷接入、多市场主体参与的方向进行转变;负荷侧加强主动响应资源管理,并尝试构建面向新能源消纳的多能互补系统;储能侧尽快建立健全相关机制,充分发挥储能的支撑作用与新能源消纳潜力。最后给出了相应的可推广至其他省市地区的应用建议。

永磁同步风力发电系统的最大功率跟踪模糊分数阶控制

在“双碳”背景下,风电作为零碳电力和新能源发电的主力军,在助力社会全面绿色低碳转型方面发挥了关键性作用。在保证发电稳定的前提下实现风能的最大化利用,提升风力发电系统发电量至为重要。文中针对永磁同一步风力发电系统的最大功率跟踪(maximum power point tracking, MPPT)问题进行研究。首先建立了永磁同步风力发电系统的机理仿真模型,用两电平双PWM全功率换流器连接风力发电机与电网。然后基于以上模型,分别设计了整数阶PI控制器、分数阶PI"控制器、模糊分数阶PP控制器以实现MPPT控制。最后对以上控制策略进行了仿真研究。结果表明,无论在阶跃风速还是随机风速下,模糊分数阶PU控制器相较于其他两种均具有更出色的MPPT性能与更强的鲁棒性。

西北新型电力系统先行示范体系探究

西北地区能源资源禀赋,是加快构建新型电力系统的排头兵,是实现全国“双碳”目标的主阵地。从西北地区“多煤富新”的资源优势、新能源为装机主体的电源布局、大外送格局的网架结构及当前西北电网新能源的高效利用情况来看,西北电网已具备新型电力系统体系雏形。但随着能源转型的稳步推进、沙戈荒大型风光基地等国家重点项目的落地,西北电网“三高双随机”的特征愈加凸显,西北新型电力系统体系建设仍面临着巨大挑战。该文分析了现阶段西北新型电力系统体系建设在电力保供、新能源高效利用、电网安全面临的挑战,以问题为导向,系统性阐述了保供电、促转型、保安全“三位一体”的西北新型电力系统先行示范体系建设研究和创新实践,并提出了策略性发展建议与展望。

新型铁路电源净化装置的典型应用

铁路电力系统是电力系统网络的重要组成部分,正在向着智能电网的方向发展。文章以铁路电力系统的构成为基础,阐述了铁路牵引电力系统和铁路电力供配电系统高效互联装备的应用需求与工程应用情况,介绍了一种铁路净化电源装置,分析了其目前面临的挑战和工程测试情况。结果表明,该装置在铁路电力系统中有较高的实用性。

电气化铁路“车-网”系统串/并联双模式宽频谐波扰动产生装置设计与测量方法

精确测量动车组与电力机车(简称机车)四象限变流器(four-quadrant converter,4QC)和牵引网的宽频带阻抗特性是识别电气化铁路“车-网”系统振荡和不稳定问题的重要途径。然而,已有研究采用单一电压/电流扰动注入方式对牵引网或机车4QC阻抗进行测量,可能造成部分谐波扰动流向非目标测量对象,导致被测对象的谐波扰动信噪比低,影响阻抗测量精度。因此,该文提出一种适用于电气化铁路“车-网”联合系统的串/并联双模式宽频谐波扰动产生装置与阻抗测量方法,装置具有电压和电流两种工作模式,可以发出频带为1~3000Hz的宽频谐波扰动。扰动产生装置拓扑主要由多绕组降压变压器、谐波功率放大单元、并联LC谐振电路和反串联绝缘栅双极晶体管(insulated gate bipolar transistor,IGBT)模块等部分构成,结合双闭环dq解耦控制和载波移相开环脉宽调制(pulse-width modulation,PWM)控制策略,实现频带双边可控、幅值可控且分布均匀的大功率谐波扰动输出。最后,利用MATLAB/Simulink仿真和RT-Lab硬件在环实验验证该文串/并联双模式宽频谐波扰动产生装置设计方案及阻抗测量方法的正确性与有效性。

双模功率分流式混合动力汽车传动系统设计

针对双模功率分流式混合动力汽车传动系统的构型,首先,对比分析了单、双模式混合动力系统结构特征及应用范围;然后,结合复合分配式特点,选定3种复合分配式四结点杆模型,通过逆向拆分得到所有可行的复合分配式构型,并根据杆长度和特征参数约束条件,确定构型方案;最后,在此基础上,参考某款车型参数,通过分析输入分配模式、模式切换点和机械点特性确定第3排行星排和离合器位置及结构参数,设计出传动系统构型,为研究双模功率分流式混合动力汽车传动系统提供理论依据。

双行星排式动力耦合系统的参数匹配与控制策略

针对混合动力乘用车的动力经济性问题,设计了双行星排式动力耦合系统。以燃油消耗量最小为优化目标,建立整车模型,对动力部件进行选型和参数匹配,采用基于转矩的逻辑门限控制策略,获取动力源最优转矩分配,建立AVL-Cruise和MATLAB/Simulink联合仿真环境,进行动力性和经济性仿真。仿真结果表明,NEDC工况下与原车相比,百公里燃油消耗量和零百公里加速时间分别下降了26.1%和7%,最高车速、最大爬坡度分别提高了19.5%和15.4%,整车的动力性与经济性均有明显改善。

论输气站场UPS三级防雷系统的保护

通过分析国内天然气企业的用电现状和陕京四线无人站南山分输站的外电设计要求及UPS使用现实情况,提出天然气站场的UPS防雷系统设计改进建议,推进站场安全管理和UPS运行的安全运行条件,从技术层面做到专业安全管理和设备本质安全水平。切实做到消除事故隐患,保证施工运行安全。