共查询到16条相似文献，搜索用时 328 毫秒
1.
通过四线圈结构磁谐振式无线电能传输系统的电路模型推导出其传输效率表达式,用两线圈模型对参数进行初步设计得出谐振线圈的半径、匝数、线径等参数．利用四线圈模型对参数进行优化,调整线圈之间的互感使系统获得最大传输效率．通过两线圈模型和四线圈模型进行系统参数设计和分析,既保证了模型分析的准确性,又简化了谐振线圈设计过程,为谐振式无线电能传输系统的优化设计提供了理论依据． 相似文献
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该文在深入分析无线电能传输技术的传输特性及其磁耦合式传输工作原理的基础上,基于LCL-S型谐振耦合原理设计了一套大功率无线电能传输实验平台。首先,利用互感耦合模型对平面型系统机构进行了电路分析;其次,搭建了该实验平台的骨架构造;最后进行了实验测试,完成了双脉冲试验、开环控制带载试验和闭环控制带载试验等,分析了谐振频率对平台传输特性的影响。实验结果表明,该实验平台在工作频率为75 kHz时,输出功率可达30 kW,系统效率达到80%以上,稳定性良好,有效可行。 相似文献
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针对很多无线供电应用场合需要保持输出电压恒定的需求,提出了一种高频逆变器前动态调压的恒压输出控制方法。以LCL-S型感应耦合电能传输系统为研究对象,通过阻抗分析法建模,发现通过元器件的参数配置,可使系统输入阻抗为纯阻性,减少无功分量,同时逆变器开关管实现了零电流开通与关断,但此时系统输出电压并不恒定。针对分析结果提出基于模糊自适应PI控制算法的逆变前动态调压控制的恒压输出控制方案,最后搭建了仿真实验平台和实验样机证明了分析结果的正确和控制方案的有效。 相似文献
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补偿网络是无线电能传输系统中的重要组成部分,可用于提高电能传输的效率、输出功率及稳定性。在对TS-S型补偿网络建模及其参数化设计分析的基础上,采用算例验证TS-S型补偿网络模型的定频谐振、恒定电压增益和高效率特性,通过实验验证相关推论及方法。结果表明,样机电压输出稳定,在耦合系数为0.2时的效率峰值达到90%。 相似文献
5.
《实验室研究与探索》2019,(9):112-115
结合磁耦合谐振式无线电能传输的相关系统,以高性能单片机为控制核心,设计了一款连续可调、两路输出、数字化、智能化的稳压电源。其中将无线电能传输系统产生的电能作为稳压电源系统的驱动电压,采用按键输入的方式,集成各种数据处理电路,在检测和控制软件的支持下,调整和控制稳压电源的工作状态,实现两路电压的输出,并用实验验证了该系统的可行性。实验结果表明,该电源稳定性较好,可靠性较高,其性能优于传统的直流稳压电源。 相似文献
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《实验室研究与探索》2020,(2)
通过在感应耦合电能传输(ICPT)系统的发射侧和接收侧分别施加补偿电路,提高ICPT系统的传输功率和效率,建立了以DSP28335为核心的LCL谐振型感应电能传输系统的实验样机。通过对LCL谐振型感应电能传输系统的发射线圈恒流特性实验研究,分析验证了传输功率、传输效率与传输距离的关系。结果表明,ICPT系统发射线圈电流在变负载和变传输距离的影响下几乎保持恒定,有利于系统的稳定、可靠运行;优化互感值并选取适当的互感值可以达到电流增益与传输效率的优化匹配,从而使ICPT系统运行于期望状态。 相似文献
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提出了一种基于电流闭环反馈控制和线性大功率放大器的恒流源设计方案。该系统采用增量型PID控制算法,以输出电流采样值为反馈量形成闭环反馈控制,通过动态调节幅度控制单元输出电压,实现对输出电流的闭环调节。选用线性大功率放大器,并采用双运放差分放大方式设计了功率放大单元,有效提升了输出电压幅度和线性度。采用最小二乘法修正了输出电流,恒流源输出精度获得了提升。利用所研制恒流源开展了低频漏磁检测实验研究。实验结果表明:该恒流源输出稳定,调节精度高,线性度好,以其作为低频交流漏磁检测激励源,有效避免了因激励信号频率、提离值发生变化和线圈自身发热等因素所造成的激励电流改变,保证了激励磁场的稳定,可有效提高低频漏磁检测精度和稳定性。 相似文献
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提出了一种基于矢量伏安法测量原理的便携式阻抗测量装置,并分析了磁耦合谐振式无线电能传输中耦合线圈结构阻抗测量电路的设计原理,通过单片机系统控制AD5933阻抗转换器测量待测谐振耦合结构的阻抗,利用串口通讯协议实现LabVIEW软件和单片机系统的相互通讯。实验结果表明,耦合线圈工作在谐振态下,阻抗测量值与理论阻抗值相对误差为2%,成本较低,便于携带,能够满足大部分耦合线圈设计需求。 相似文献
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Tidal current turbines (TCTs) are newly developed electricity generating devices. Aiming at the stabilization of the power
output of TCTs, this paper introduces the hydraulic transmission technologies into TCTs. The hydrodynamics of the turbine
was analyzed at first and its power output characteristics were predicted. A hydraulic power transmission system and a hydraulic
pitch-controlled system were designed. Then related simulations were conducted. Finally, a TCT prototype was manufactured
and tested in the workshop. The test results have confirmed the correctness of the current design and availability of installation
of the hydraulic system in TCTs. 相似文献
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This paper presents a bi-directional permanent-magnet linear actuator for directly driving electrohydraulic valves with low power consumption. Its static and dynamic performances were analyzed using the 2D finite element method, taking into account the nonlinear characterization and the eddy current loss of the magnetic material. The experiment and simulation results agree well and show that the prototype actuator can produce a force of±100 N with the maximum power being 7 W and has linear characteristics with a positive magnetic stiffness within a stroke of ±1 mm. Its non-linearity is less than 1.5% and the hysteresis less than 1.5%. The actuator＇s frequency response （-3 dB） of the displacement reaches about 15 Hz, and the most significant factor affecting the dynamic performance is identified as the eddy current loss of the magnetic material. 相似文献
13.
Voltage source converter high-voltage direct current （VSC-HVDC） is a new power transmission technology pref- erable in small or medium power transmission. In this paper we discuss a new control system based on space vector modulation （SVM） without any voltage line sensors. Using direct power control （DPC） SVM and a new double synchronous reference frame phase-locked loop （DSRF-PLL） approach, the control system is resistant to the majority of line voltage disturbances. Also, the system response has accelerated by using a feed forward power decoupled loop. The operation of this control strategy was verified in a SIMULINK/MATLAB simulation environment. To validate this control system, a 5 kV.A prototype system was constructed. Compared to the original controllers, the current total harmonic distortion （THD）, the active and reactive deviations and the DC voltage overshoot were lowered by 2.5%, 6.2% and 8%, respectively. The rectifier power factor in the worst condition was 0.93 and the DC voltage settling time was 0.2 s. 相似文献
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A novel direct-drive type wind power generation system based on hybrid excitation synchronous machine (HESM) is introduced
in this paper. The generator is connected to an uncontrollable rectifier, and a fully controlled voltage-source inverter is
used to connect the system to utility grid. An intermediate DC bus exists between the rectifier and inverter. A new control
strategy is proposed which achieves the maximum power point tracking (MPPT) with the control of excitation current of HESM
and stabilizes the DC link voltage with the control of inverter output current simultaneously. Specially-designed buck circuit
is used to control the excitation current of HESM, and grid voltage-oriented vector control strategy is employed to realize
the decoupling of the inverter output power. Simulation results and experiment in 3 kW lab prototype show an excellent static
and dynamic performance of the proposed system. 相似文献
15.
针对无线电能传输系统因线圈偏移、受电设备阻抗变化等导致系统模型参数不精确的问题,提出一种基于粒子群算法的LCL-S 型无线电能传输系统负载与互感辨识方法。根据LCL-S补偿拓扑原边恒流及副边恒压的输出特性,采用滤波电容能量守恒理论,建立负载输出电压与互感、原边线圈电压与负载的数学描述。以输出电压理论值与实际值之间的误差构建成本函数,设计粒子群算法,通过数值寻优实现参数的辨识。仿真与实验结果均验证了该方法能够较为准确地辨识出互感与负载大小,且无需增加额外硬件电路及控制,降低了系统复杂程度。 相似文献
16.
The effects of parasitic capacitance in induction motor system are unnoticed when it is fed from the AC line,but they are obvious when supplied directly from a PWM inverter,Consequently,many parasitic problems occur.Such as motor-to-earth leakage current.Bearing current.incoming line current distortion and uneven distribution of electrical stresses along the winding.On the basis of the uniform transmission line principle.a complete equivalent circuit of the PWM inverter-fed motor system is presented,based on which all the capacitive parasitic problems mentioned obove are analyzed and simulated by means of PSPICE.All the results are consistent with the existing ones. 相似文献