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针对目前矿用组合开关存在抗干扰性差、维修困难等问题,提出了一种基于PLC的新型矿用双回路组合开关综合保护控制器的设计方案。该综合保护控制器以西门子S7-200 PLC为中央控制单元,通过硬件设计及软件编程,可实现短路、过载、断相、过欠压、漏电闭锁等保护功能。同时,人机界面采用威纶通MT6070iH全中文液晶触摸屏显示,简洁直观、易操作。试验表明,该控制器的各项保护控制功能均能快速准确执行,确保了整个装置工作的安全性、稳定性及抗干扰性。 相似文献
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本文给出了一种具有良好软启动特性和跟踪放电火花性能及保护功能的除尘电源控制器的设计。文中对主要电路的设计进行了分析,给出了控制器的主要性能和现场应用情况。 相似文献
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针对现有的永磁操动机构真空断路器控制电路采用2个直流接触器切换储能电容对分、合闸线圈供电存在控制时间不准确、分散性大、难以与高压综合保护器联动、功耗多、成本高等问题,提出了一种交流高压真空断路器双稳态永磁机构控制器的设计方案,详细介绍了该控制器的硬件电路和软件设计。该控制器具有完整的永磁机构控制单元,可实现合闸、分闸、闭锁以及欠压延时、欠压保护等功能,并为远程通信提供技术基础,在断路器技术参数范围内可保证安全、可靠运行,并可在额定参数范围内进行频繁操作。 相似文献
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针对现有矿用开关电源存在的谐波电流较大、功率因数较低等问题,采用主动功率因数校正与谐振软开关电源技术设计了一种矿用开关电源,介绍了该电源的设计指标及硬件电路设计方案。试验结果表明:在170V交流输入且输出满载条件下,矿用开关电源输入电流未出现脉冲状,谐波电流小;50℃环境温度下,电源主要器件的最大温度为98.5℃;在输入电压为AC90~265V时,电源功率因数不小于0.96,纹波电压小于30mV,电源效率达86.5%;绝缘耐压试验中绝缘电阻不小于50 MΩ,漏电流低于1mA。 相似文献
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本文以开关电源为控制对象,并提出了基于PSO的开关电源LQR控制器的设计.首先,利用现代控制理论建立了开关电源的状态空间模型,而后采用粒子群算法对开关电源LQR控制器加权矩阵进行了优化,以保证该电源能够为用户的精确地提供所需的电源.仿真结果表明,该课题所采用的方法能够满足系统输出快速响应的要求,各项指标优于传统方法所得到的结果. 相似文献
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为了全面掌握电缆绝缘中气隙缺陷处电场分布的影响因素及规律,以矿用高压XLPE电缆为研究对象,利用ANSYS有限元软件建立了包含气隙缺陷的电缆结构模型;在对绝缘中气隙的形状、尺寸与电场强度的关系进行理论分析的基础上,仿真研究了气隙的形状、尺寸、位置及绝缘层厚度对气隙中电场分布规律的影响。结果表明,4种不同形状的气隙中,椭圆柱体气隙缺陷处的电场强度最大,且垂直于绝缘中电场方向的气隙长度越大,气隙中电场强度越大;对于气隙尺寸,r值越大,气隙处电场强度越大,而气隙大小的变化对气隙处电场强度的影响并不大;对于不同半径的气隙,随着气隙距离导体屏蔽层距离的增大,气隙处最大电场强度均先增大后减小;对于给定尺寸的气隙,随着绝缘层厚度的减小,气隙中电场强度与绝缘中电场强度均相应增大。这些结论为气隙缺陷局部放电等相关研究奠定了基础,同时也为电缆的运行与维护检修提供了技术指导。 相似文献
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提出了一种以PIC16F884单片机为控制单元,以两台塑壳断路器双电源开关为控制对象的智能控制器的设计方案.介绍了控制器的工作原理和工作模式,并给出了硬件方案和软件设计思想以及抗干扰的方法. 相似文献
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Various applications of micro-robotic technology suggest the use of new actuator systems which allow motions to be realized with micrometer accuracy. Conventional actuation techniques such as hydraulic or pneumatic systems are no longer capable of fulfilling the demands of hi-tech micro-scale areas such as miniaturized biomedical devices and MEMS production equipment. These applications pose significantly different problems from actuation on a large scale. In particular, large scale manipulation systems typically deal with sizable friction, whereas micro manipulation systems must minimize friction to achieve submicron precision and avoid generation of static electric fields. Recently, the magnetic levitation technique has been shown to be a feasible actuation method for micro-scale applications. In this paper, a magnetic levitation device is recalled from the authors’ previous work and a control approach is presented to achieve precise motion control of a magnetically levitated object with sub-micron positioning accuracy. The stability of the controller is discussed through the Lyapunov method. Experiments are conducted and showed that the proposed control technique is capable of performing a positioning operation with rms accuracy of 16 μm over a travel range of 30 mm. The nonlinear control strategy proposed in this paper showed a significant improvement in comparison with the conventional control strategies for large gap magnetic levitation systems. 相似文献
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The paper focuses on the design of excitation controller and power system stabilizer (PSS) control schemes to enhance voltage regulation and transient stability. To design the excitation controller, the nonlinear models of the synchronous generator and electrical system are suitably arranged to give an input-output nonlinear model, which is subsequently made linear by a compensating law. The PSS control scheme is designed according to a new approach, based on the inverse system theory, which guarantees satisfactory swing damping by reducing the mutual influence between transient stability and voltage regulation. The results obtained by numerical simulations in different operating conditions confirm the effectiveness of the proposed design, also in the presence of model parameter inaccuracy. 相似文献
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Zairong Xi 《International journal of control》2013,86(13):1002-1011
A direct method of constructing a decentralized saturated controller is very important in the controller design of multimachine power systems. Among the existing designs the author first constructed a state feedback, then saturated the controller. However, the author could not prove that this saturated controller was valid. In this paper a multi-machine power system as a Hamiltonian control system with dissipation is first represented. Then using a Hamiltonian function a decentralized saturated excitation control scheme, which is a static measurable feedback, is proposed. Last, the design is discussed in detail on a three-machine power system. Simulations show that the saturated, simple control law works well. 相似文献