高温脉冲压力试验系统

介绍了一种对汽车散热器及蒸发器进行可靠性检测试验的自动化系统。该系统采用计算机控制．实现了对压力、温度、流量、液位等参数的自动测量及控制。该系统填补了我国汽车散热器及蒸发器高温脉冲压力实验的空白。     

基于生产目标的铝粉氮气雾化过程优化控制

铝液液位和温度、雾化氮气压力和温度以及环境氮气压力和温度之间,具有复杂的非线性、大滞后、强耦合和严重不确定性的特点,很难用机理建模方式获得它们的确定模型。针对这一问题,以优化铝粉粒度分布为生产目标,提出了基于RBF神经网络建立铝粉氮气雾化生产过程模型,采用改进的遗传算法对雾化过程各控制量的设定值进行优化,根据工况条件的变化动态地设定各个控制环节的设定值使铝粉氮气雾化效果达到最佳,从而提高微细铝粉收率的优化控制方法。优化前和优化后的铝粉粒度分布对比结果表明,采用该方法能显著地改善氮气雾化效果,有效提高微细铝粉收率。     

矿用自动喷雾洒水控制器的设计

介绍了一种自动喷雾洒水控制器的设计。该控制器利用控制主机控制电磁阀的开关,实现了喷雾装置的自动洒水。实际应用表明,该控制器可靠性高,雾化效果好,平均降尘率为92.7%。     

内混式空气雾化喷嘴雾化性能的实验及模拟研究

费托合成装置气液分离器的分离性能研究中,雾滴粒径的准确测量和控制是关键。本文对内混式空气雾化喷嘴的喷雾性能进行了实验研究,考察了液滴索特尔直径D_(32)的轴向分布,以及气液比、液体流量与黏度对其的影响规律;同时结合CFD数值模拟,进一步研究了气液相对速度、雾化锥角及液体表面张力对液滴D_(32)的影响。结果表明:液滴D_(32)沿喷雾方向不断增大;液体雾化主要通过喷嘴内气流对液膜的剪切、冲击作用,因此增大气液比可增强雾化效果,但存在"饱和"现象;液量的增大不利于液膜破碎雾化;增大气液相对速度可显著提高雾化效果;同时,液体黏度和表面张力对雾化效果影响很大,黏度或表面张力越大,雾化显得更为困难。此外,液滴轴向速度沿喷雾方向先迅速下降随后缓慢降低。     

三菱冗余系统在锅炉汽包液位控制中的应用

为了保证蒸汽锅炉的安全运行,将汽包液位保持在规定的范围内,采用了模糊三冲量串级控制方法对蒸汽锅炉的水位进行控制,并通过使用三菱冗余过程控制系统及其先进的远程I/O光纤网络和以太网络,实现了对某电厂两台锅炉汽包液位控制的改进,极好地解决了“虚假水位”的问题,并且改变了原有汽包水位控制自动化程度较低的状况,使整个锅炉系统的稳定性和可靠性得到提高,取得了较好的应用效果。     

基于STM32的凝结水液位监控系统的设计与实现

为降低PLC控制单容器液位控制系统的设计难度及成本,本系统选用STM32和STC89C51分别作为上位机与下位机的处理器,设计了基于Modbus-RTU协议的液位监控系统;实现了数据实时采集、显示与报警功能;采用PID算法很好的实现了凝结水液位恒值控制,满足了设计要求;最后给出了系统的实物图和测试结果。实验表明,该系统经济实用,抗干扰能力强,可以在工业控制中广泛使用。     

基于PCS7平台对于锅炉液位的控制系统应用

基于SIMENS的PCS7对于锅炉液位控制过程中应用并且提出先进的控制策略实现。首先深入了解了锅炉液位的生产原理和工艺流程;其次,设计了控制系统,讨论了运用PCS7如何对电厂设备中锅炉液位环节的自动控制和实时监控,最后为了保证锅炉安全和蒸汽的高效,在汽包的液位控制上采用了PID控制算法结合三冲量串级调节,在实际运行期间取得了良好的效果。     

核电厂稳压器液位控制系统控制逻辑闭环验证

为了实现对核电厂稳压器液位控制系统控制逻辑的闭环验证,采用仿真技术,建立核电厂工艺和仪控系统模型。基于OPC技术,实现闭环验证过程中的数据通信;通过对模拟信号的响应产生控制逻辑反馈,得到被验证的稳压器液位控制系统接入后的电厂状态参数。试验结果表明,该闭环验证方法能够实现对稳压器液位控制系统在稳态和瞬态工况下的闭环响应验证,获得了较好的验证效果。     

远程分段式油罐自动计量系统的设计与实现

通过分析油罐内油品液位对罐储自动计量的影响,介绍了一种远程分段式油罐自动计量系统,阐述了系统的设计、实现及现场应用情况,分析了自动计量系统的实际应用效果,该系统为油田集输站库实现计量自动化提供技术支撑。通过该系统的推广和应用,可以实现油田储罐液位的自动监测,降低员工劳动强度,提高综合效益,达到油罐液位远程自动化管理的目标。     

选煤厂中煤浓缩机药剂添加自动控制系统的设计

本系统运用PLC控制系统来代替传统的继电器逻辑控制系统,以提高系统的可靠性,灵活性,降低故障率和系统维护费用。系统运用液位检测装置采集液位信号,接近开关采集位置信号,并运用PLC控制器作为信号处理单元处理输入信号并控制各电动执行机构按程序设定运行,实现药剂系统的注水,药剂添加,搅拌,向药剂存贮池注药,给浓缩机加药的全自动控制并实现系统实时监测及故障报警。     

功率放大器OPA544在主动磁悬浮控制系统中的应用

在磁悬浮系统的功放中采用OPA544功率器件实现对系统输出负载电流的放大作用,其性能将随功放的类型而变化.针对毫米级气隙的悬浮系统,设计前级PID控制调理电路,与OPA544功率放大器配合实现差动式电流控制,最终在一台主动磁悬浮平板试验台上实现系统的稳定悬浮,仿真结果与试验情况基本吻合.     

基于滑模控制的含风储多域电力系统负荷频率控制

建立含风储多域互联电力系统负荷频率控制(LFC)模型,同时考虑系统参数不确定性、储能系统和传统机组控制信道延时问题.为提高系统鲁棒性,降低储能系统的容量配置,针对含风储的LFC模型,设计滑模负荷频率控制器,并提出滑模负荷频率控制器和储能协调的控制策略.算例分析表明,所提出的协调控制策略在新能源大规模渗透和系统负荷波动情况下能够有效减小系统频率偏差和区域控制偏差,同时降低储能系统的配置容量,提高电力系统安全稳定运行的经济性.     

基于无线监控的离子水雾化加湿系统设计

基于现有雾化加湿系统,结合无线物联网技术、电解水技术和传感器检测技术,并对离子水雾化装置进行了研究,提出并设计了基于无线监控的离子水雾化加湿系统,可实时监测室内外温湿度,并通过无线物联网技术对离子水发生装置和其他温控设备进行控制,还可以在加湿过程中对病原体进行有效抑制或杀灭,达到环境保湿和预防病原体滋生的作用.     

A Game Theory‐Based Coordination and Optimization Control Methodology for a Wind Power‐Generation Hybrid Energy Storage System

The installation of an energy storage system to smooth the fluctuations of wind power output at a certain wind farm can improve the electric quality of wind power connected to the grid. In order to reduce the capacity of the energy storage system and the loss of the battery and make full use of the advantages of the super‐capacitor, a game theory‐based coordination and optimization control methodology for a wind power‐generation and storage system (WPGSS) is presented in this paper. Aiming to maximize the WPGSS's overall profit, the methodology, taking the smoothing effect of the active power, the cost of the hybrid energy storage system (HESS), and the earnings of wind power connected to grid into consideration, builds a coordination and optimization control model based on the ensemble empirical mode decomposition (EEMD) algorithm combined with game theory. In the model, the low‐pass filtering signal obtained by the EEMD is used to smooth the fluctuations of wind power output, and the band‐pass filtering signal and high‐pass filtering signal obtained by the EEMD are used to achieve energy distribution among the HESS. Cooperative game theory is introduced to determine the filter order of the EEMD according to the state of charge (SOC) of the HESS and to achieve the coordination and optimization control of the WPGSS taking the maximization of the WPGSS's overall profit as the game's goal constraint conditions. The genetic algorithm (GA) and particle swarm optimization (PSO) are adopted to solve the model's optimal solution, and the simulation tests were realized to verify the effectiveness of the proposed method, which can provide a theoretical basis for the coordination and optimization control of the WPGSS.     

基于模糊控制的冻结站节能控制系统的设计

为有效降低煤矿冻结法凿井冻结站的电能损耗,提高冻结站盐水泵的智能控制水平,设计了一种基于模糊控制的冻结站节能控制系统,详细介绍了系统的硬件工作原理,阐述了系统A/D采样处理模块、模糊控制模块、D/A频率输出模块、远程监控通信模块等的软件设计,并给出了流程图。该系统采用先进的嵌入式系统构建系统硬件控制系统,运用模糊控制算法实现变频器控制电机转速以适应变负荷的流量需求,达到了高效节能控制的目的。     

生物质气化耦合燃煤发电系统热经济性分析

为了充分利用我国丰富的生物质资源,改善现有能源结构,实现节能减排,本文通过某350MW燃煤机组建立了一种生物质气化耦合燃煤发电机组工艺系统。基于热功转换原理,充分考虑生物质气化耦合燃煤发电系统特点,采用等效焓降法对该系统进行热经济性分析。分析结果表明,生物质气化炉产生的高温气化气进入炉膛再燃可替代大量燃煤,显著降低CO2排放量;同时,经冷却器降温后的高温气化气显热可回收至8号高压加热器,能进一步降低机组热耗,提高机组效率。因此,相较生物质直燃发电,生物质气化耦合燃煤发电是一种经济的技术改造手段,能够显著降低燃煤消耗,优化能源结构,提高生物质资源的利用效率,降低碳排放,也是我国实现并达到2030年非化石能源发电量占比不低于50%目标的重要途径。     

有源电力滤波器多内模复合控制策略控制分析

为消除单一通过矢量谐振(VR)进行控制时面临的缺陷,采用重复控制(RC)并合理设置校正因子,设计了多内模控制器,通过对RC进行充分控制的方式达到跟踪与控制谐波分量的作用.采用MATLAB软件建立了上述系统模型并完成仿真测试.研究结果表明:电压与电流总谐波失真(THD)都低于1％,并没有发生明显畸变,呈现正弦波的特征.以...     

Advanced automotive thermal management – Nonlinear radiator fan matrix control

Advanced automotive cooling systems for gasoline and diesel engines can improve the powertrain performance. The replacement of the mechanical driven coolant pump and radiator fans with computer controlled servo-motor actuators, and update of the wax-based thermostat valve with a 3-way variable position smart valve, allow the coolant flow rate and proportion directed through the radiator to be carefully adjusted. A smart thermal management system approach can regulate the forced convection heat transfer process to match the engine׳s cooling needs. This paper presents a Lyapunov based nonlinear control strategy to solely operate the radiator fan matrix for transient engine temperature tracking. A reduced order mathematical model serves as the basis for the closed-loop feedback system. An adaptive backstepping method was implemented to derive the control law. An experimental test bench with multiple radiator fans, heat exchanger, wind tunnel, coolant pump, three way valve, and engine thermal load has been fabricated. Representative numerical and experimental tests demonstrate that the advanced control strategy can regulate the engine temperature tracking error within 0.12 °C and compensate the unknown heat load. The nonlinear controller provided superior performance in terms of power consumption and temperature tracking as evident by the reduced magnitude when compared to a classical PI with lookup table based controller and a bang bang controller.     

Design and fabrication of medical micro-nebulizer

The application of a spray device to treat respiratory disease has long been known to be effective. Clinical studies have shown that the finer the droplet size, the deeper position of trachea that can be reached. With the aim of enhancing the curative effect, this study proposes a new design of micro-nebulizer, integrating a piezoelectric actuator, micro-nozzle plate, and the cavity of the micro pump to achieve a high-quality atomizing effect. In this research, we built a novel portable micro-nebulizer device with a changeable and cleanable medication chamber, which can generate a spray droplet of less than 4.04 μm in size (sauter mean diameters, SMD) and has a nebulizer rate of 0.5 ml/min. The device has an electrical requirement of drive voltage only 3 V, with a low power consumption of 1.2 W and an optimal operation frequency of 120 kHz. According to the simulations and experiments, it can be inferred that the droplet size distribution of the micro-nebulizer described in this research is finer and more uniform than that of the current conventional devices; furthermore, the system power consumption is lower than that of the ultrasonic-type nebulizer.     

Fuzzy logic-based coordinated control method for multi-type battery energy storage systems

In order to take full advantage of the complementary nature of multi-type energy storage and maximally increase the capability of tracking the scheduled wind power output, a charging–discharging control strategy for a battery energy storage system (BESS) comprising many control coefficients is established, and a power distribution method employing fuzzy control principles to optimize the multi-type BESS is proposed, so as to reduce the error of day-ahead short-term wind power prediction. A simulation analysis, taking a typical wind farm output as an actual data sample, showed that the proposed fuzzy logic control method for the multi-type BESS is uniquely flexible and adaptable in achieving the control effect of improving the capability of tracking the scheduled wind power output.