摘要：为了克服多绕组的耦合效应,使变压器式可控电抗器(controllable reactor of transformer type,CRT)安全、可靠、高效地工作,就必须得对CRT的结构进行优化设计。基于解耦磁集成技术,提出了一种适用于CRT解耦集成的磁芯结构,通过提供低磁阻磁路实现了各控制绕组的解耦。在CRT各绕组漏抗解析计算的基础上,建立了电容–回转器等效电路,并以此等效电路为基础对气隙大小的合理化选择进行了分析。通过在MATLAB平台下搭建的电路模型,完成了各绕组电流分布的仿真分析,验证了所提结构在一定程度上能够很好地消除控制绕组间的磁耦合并提高绕组容量利用率。

摘要：针对目前农村农田灌溉的现状,研制了一种低成本、高可靠性的非接触式IC卡农田灌溉计费系统,介绍了其工作原理及软硬件设计思路。

摘要：将电网中不对称负荷产生的基波负序电能作为研究对象,以合理计量电能为研究目的,分析了不对称负荷产生的负序电能对电能计量的影响,针对现有有功电能计量方法存在的问题,提出了一种考虑不平衡责任的奖罚性电能计量新方法。采用功率分解的方法将PCC点处的负序有功功率分解为系统侧和用户侧产生的负序有功功率。基于IEEE Std.1459-2010功率理论提出了一种定量评估不平衡责任的新指标—负序视在功率,给出了不平衡责任的具体计算方法,并根据不平衡责任值设置了奖罚系数的参考值。设计具体的仿真算例,验证了在负序污染严重的电网中,采用所提奖罚性电能计量新方法更加公平、合理。

摘要：The rapid development of urban rail transit brings convenience to the public,but its huge energy consumption problem cannot be ignored.A microgrid composed of photovoltaic power generation unit,regenerative braking energy feedback unit and battery energy storage unit is proposed,which provides green power for the *** order to suppress the fluctuation of photovoltaic power generation and the intermittence of regenerative braking feedback energy,the energy management mode of microgrid is designed according to the illumination situation,braking energy feedback situation,battery state of charge and so *** addition,a coordination control method based on virtual synchronous generator(VSG)is proposed to realize smooth switching among ***,the proposed energy management and coordination control method for elevated station microgrid is verified by Matlab/*** results show that the elevated station microgrid can operate safely and reliably under various energy management modes and realize smooth switching among modes.

摘要：A novel magnetic integrated controllable reactor of transformer type(CRT)has the advantages of simple structure,flexible assembly,convenient maintenance and *** analyze its operation characteristics accurately,we establish corresponding equivalent mathematical model considering magnetic leakage based on magnetic circuit and circuit dualistic transformation *** distribution of magnetic leakage field of each winding is analyzed qualitatively,and the analytical calculation formulas of magnetizing inductance and leakage inductance of each winding are *** on this,the analytical calculation formulas of short-circuit impedance and winding current of CRT under different working conditions are *** field-circuit coupling finite element model of the magnetic integrated CRT is established to simulate the current of each winding under different working *** results show that the analytical calculation results of each winding current have good consistency with the finite element calculation results,indicating the validity of CRT equivalent mathematical model and correctness of the analytical formulas of leakage inductance,short-circuit impedance and winding current of *** working winding current of CRT is increasing gradually with the operation of control winding in turn to realise the transition of CRT compensation capacity from zero to a rated value.

摘要：针对无线通信节点的小型化需求及已有印刷版倒F天线归一化阻抗较差,增益较小的问题,设计一种应用于无线终端节点且中心频率为2.45 GHz的印刷倒F型弯折天线。采用Ansys HFSS建立天线模型,根据理论对天线参数仿真研究,通过参数扫描分析获得最优参数。在此结构参数下,谐振频率2.45 GHz处天线的归一化阻抗为(0.979 1-0.188 2 i)Ω,最大增益可达到3.81 dB,回波损耗为-20.42 dB。同时应用于CC2530无线通信节点,测试表明:加载该天线的节点在一定条件下丢包率约为0.2%,优于同类天线。

摘要：混合型有源滤波器能否按其工作原理实现预期的谐波抑制效果,在很大程度上还有赖于无源滤波器的优化设计。文章首先介绍了由小容量有源滤波器和无源滤波器串联构成的混合电力滤波系统,继而建立了其无源部分的优化模型,采用改进的遗传算法对系统的投资成本、无功补偿和滤波效果三个方面进行了优化设计研究。为克服算法的早熟收敛现象,引入了混沌算子来增加种群的多样性。工程算例的仿真计算验证了该方法的正确性和可行性,且综合性能较好,工程应用价值较高。

摘要：针对城市轨道交通启停频繁的运行特点,从降低牵引能耗的角度出发,应用"四阶段"最优运行策略,得到各个阶段牵引能耗的计算公式。以牵引距离为自变量,将运行距离和线路条件等作为约束条件,设计了单列车站间牵引能耗计算方法。在此基础上,以牵引能耗值和运行时间误差的权重和作为目标函数,采用遗传算法进行优化,得到最优的牵引距离,从而得到各个阶段的运行距离,达到定时节能的目的。通过限制最大加速度值达到同时降低牵引能耗值和提高乘客舒适度的目的。通过算例在MATLAB软件中进行仿真分析,与实测值相比,定时节能优化情况下可节能22.45%;兼顾舒适度情况下,可节能21.99%。从仿真图可以看出,优化结果减少了工况转换次数,曲线更平滑。

摘要：There is a certain coupling relationship among the main circuit parameters of a single-phase shunt active power filter(SAPF),which has a great influence on the reasonable selection of various parameter *** analyzing the calculation methods of the inductance of alternating current(AC)side and the voltage and capacitance values of direct current(DC)side in the existing single/three-phase SAPF main circuit,a specific single-phase SAPF circuit parameter analytical expression was *** at the coupling relationship among the variables in the resulting expression,the model was optimized and analyzed in MATLAB,and a complete set of parameters design scheme was obtained,which ensure the comprehensive optimization target of the post-harmonic content below 2% is compensated under a specific *** simulation and experimental procedures verify the correctness of the selected parameters.

摘要：特高压远距离输电系统中,高速响应可控电抗器通过实现容量大范围内快速平滑可调和限制过电压等重要作用,很好地提高了输电电量和质量。笔者以线路分布参数和均匀传输线方程为基础,采用电力系统潮流计算方法,得到适用于各种负载类型的可控电抗器补偿度公式。分析了可控电抗器的补偿度与线路电压、传输功率之间的关系。为特高压可控电抗器的设计和控制提供了理论基础,有利于进一步研究安装可控电抗器的特高压输电线路的特性。