Parallel Multipopulation Differential Evolutionary Particle Swarm Optimization for Voltage and Reactive Power Control

This paper presents parallel multipopulation differential evolutionary particle swarm optimization (DEEPSO) for voltage and reactive power control (VQC). The problem can be formulated as a mixed integer nonlinear optimization problem and various evolutionary computation techniques have been applied to the problem including PSO, differential evolution (DE), and DEEPSO. Since VQC is one of the online controls, speed‐up of computation is required. Moreover, there is still room for improvement in solution quality. This paper applies parallel multipopulation DEEPSO in order to speed up the calculation and improve solution quality. The proposed method is applied to IEEE 30, 57, and 118 bus systems. The results indicate that the proposed method can realize fast computation and minimize more active power losses than the conventional evolutionary computation techniques.     

数字化羊绒测色法及其在长度测量中的应用

针对光电法测试纤维长度等性质时,存在纤维的透光及反光信号与颜色高度相关的问题,采用数字化方法表征羊绒的颜色类别并精准地测量羊绒的长度。将彩色光电耦合器作为测色传感器,搭建了更适合纤维材料的测色装置;通过颜色模型在3种色空间的转换,得到3类颜色的羊绒在三维色空间的分布;基于系列实验,创建了有色羊绒的光学参数即无穷厚时的表观反射率表观反射率与测色装置计算的亮度指标之间的换算模型,并用实验证明采用测得的表观反射率可计算得到准确的须丛线密度曲线,从而可用光电法精准测量有色羊绒的长度。结果表明,该测色方法的测样面积大,代表性好,成本低,同时可用于其他纤维和纺织品的颜色测量。     

一种基于施密特触发器原理的直流电机位置控制及消抖算法

有刷直流电机的位置控制是一种常用的工作场景，对系统的响应速度、调节速度和控制精度等都有一定要求。经典的有刷直流电机位置控制算法一般都较理论，算法编写和调试较为复杂。基于现实应用需求，提出了一种新型的控制算法。该算法基于电子电路中施密特触发器的工作原理，实测具有响应速度快、控制精度较高、无抖动、适用范围广和编程简易等特点，可供相关技术人员参考借鉴。     

阳极导电材料对铁钨锡合金粉电解铁的影响

研究阳极导电材料碳素钢、316L不锈钢、铅钙合金、石墨、钛涂钌板、钛板和铜板在硫酸盐和氯盐体系中对铁钨锡合金粉电解铁的影响。结果表明:电解24 h,上述阳极导电材料在氯盐中的阴极电流效率为90%、90%、66%、66%、54%、49%、33%,在硫酸盐中的阴极电流效率为90%、87%、82%、81%、73%、68%、54%。槽电压均逐渐升高,在氯盐体系中,石墨、铅钙合金、钛涂钌板和钛板作阳极导电材料时,电解液pH逐渐降低;碳素钢、316L不锈钢和铜板作阳极导电材料时,电解液pH逐渐升高。在硫酸盐体系中,铜板和碳素钢作阳极导电材料时,电解液pH基本不变;316L不锈钢作阳极导电材料时,pH逐渐升高;铅钙合金、石墨和钛板作阳极导电材料时,pH先升高后降低。基于槽电压、阴极电流效率,选择适宜的电解体系为硫酸盐体系,该体系中适宜的阳极导电材料为铅钙合金。     

Experimental research on temperature rise and electric characteristics of aluminum air battery under open‐circuit condition for new energy vehicle

Due to lack of systematic research on open‐circuit voltage (OCV) and electrolyte temperature rise characteristics of aluminum air battery, in order to explore the influential factors on the OCV and electrolyte temperature rise of aluminum air battery, in this paper, for the first time, we studied the effects of different ambient temperature conditions, different concentrations of NaOH and KOH electrolyte, and pure aluminum and aluminum alloy on the OCV and electrolyte temperature rise of aluminum air battery. Results show that the OCV of aluminum air battery is obviously affected by ambient temperature conditions, electrolyte concentration, and different anode materials. The OCV range is 1.5 to 1.8 V at 0°C under different KOH‐electrolyte concentrations when aluminum alloy is used as anode material; with the increase of ambient temperature, the OCV will rise, and the range is 1.8 to 1.95 V. The working process of aluminum air battery is accompanied by the phenomenon of heat release, and the temperature rise range of electrolyte will not exceed 7°C when aluminum alloy is used as the anode material; however, the highest temperature of the electrolyte can reach 100°C when pure aluminum is used as the negative electrode material. The results of this study will provide theoretical guidance for designing aluminum air batteries and identifying their optimal operating conditions.     

Evaluation of fluctuating voltage topology with fuel cells and supercapacitors for automotive applications

To develop a single‐stage power conversion topology in which energy storage devices can be directly coupled, a fluctuating voltage topology is applied, leading to lower cost and more compactness with the absence of DC/DC converters. This paper investigates such a topology for automotive applications where fuel cells are directly connected to the DC bus of the inverter, resulting in fluctuating voltage across the DC bus. Further, a supercapacitor pack is also introduced to maintain the power capacity and voltage stability. The hybridization principle and practical application of such a topology are then discussed in the time domain and frequency domain. Furthermore, the transient power requirement is decomposed to design the size of fuel cells and supercapacitors. Simulation results from the modeling of the fuel cell‐supercapacitor powertrain demonstrate the feasibility and effectiveness of this topology. The supercapacitors can serve as a low‐pass filter for the fuel cells. In conclusion, the peak power requirement can be successfully achieved because of the lowered system impedance, and the fuel cells only need to supply the average power.     

基于过程免疫力的动态电压恢复器优化配置

优质电力园区以最低成本满足用户对电能质量的特殊需求,成为解决电压暂降问题的新途径,已在国内外开展了广泛的试点应用。针对中国优质电力园区规划缺少经济高效的优化配置方法的实际情况,提出了一种基于过程免疫力的动态电压恢复器优化配置方法。基于工业过程电压暂降免疫力,以满足用户用电需求为目标,以治理设备购置费用最低为约束,采用遗传算法对园区供电质量分级制定动态电压恢复器的优化配置方案,实现工业园区电压暂降治理的经济性。对大型精密温控系统的电压暂降治理装置的优化配置方法进行仿真计算,验证了所提方法的有效性与经济性。     

Prism Signal Processing of Coriolis meter data for gasoline fuel injection monitoring

Prism Signal Processing is a new recursive FIR technique offering rapid filter design and calculation. It has previously been applied to Coriolis mass flow metering to generate fast (48 kHz) flow measurement updates, facilitating for the first time the direct mass flow measurement of individual fuel pulses injected into a laboratory diesel fuel injection test bench. In this paper we describe an augmented sensor signal filtering scheme which enables rapid tracking of the desired mode of flow tube vibration while notching out undesired modes. The new scheme is applied to a gasoline injection test bench where the vibrational interference is greater than for the previously described diesel system due to increased hydraulic shock. The paper presents experimental findings which illustrate the further challenges to be overcome in order to achieve the goal of traceable direct mass flow measurement of individual fuel injection pulses. For example, when a fuel pulse is shorter than the resonant period of the flow tube, the observed phase difference appears to show dependence on the instantaneous phase of the flow tube vibration.     

基于 GA-SVM 算法的通信网络入侵信号自动识别技术

针对当前通信系统入侵行为自动识别技术存在入侵信号样本识别成功率较低、误识别率和漏识别率较高的问题,提出基于 GA-SVM 算法的通信网络入侵信号自动识别技术。利用混沌原理提取通信网络入侵的非平稳信号时域特征,并凭借自回归模型提取对应频域特征,捕捉邻域入侵信号间的非线性时空动作频率,评价相邻行为间的状态关联性,预测入侵信号后续行为,完成入侵信号的识别。实验表明,所提方法识别精度高、误识别率较低,漏识别率非常低,具有可应用于实际的理论价值。     

Design and implementation of current mode circuit for digital modulation

This paper proposes a new current-mode digital modulation circuit. The proposed circuit is MOS only hence, easily integrable. It employs an Extra X Current Conveyor (EX-CCII), two MOS transistors as switches, and a two MOS transistor-based active resistor. The amplitude shift keying/phase shift keying/frequency shift keying (ASK/PSK/FSK) modulator is obtained by proper selection of carriers (I_C1, I_C2). This circuit provides the current output signal at high output impedance, which is favorable for cascading. Also, the circuit is employing only MOS transistors, so it can be monolithically IC implementable. The effects of non-idealities and parasitics of the active element on the circuit performance are also investigated in detail. The functionality of the proposed digital modulator is verified through the Cadence Virtuoso tool using 0.18 μm Generic Process Design Kits parameters with the ±0.9 V supply voltage. The total area of the layout is 968.75 μm². Also, the experimental results are verified by using the IC AD-844 and IC CD4007.