共查询到19条相似文献,搜索用时 187 毫秒
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论述了一种基于DSP2812控制平台的双PWM变频调速系统.该系统具有控制灵活、功率因数高、节能环保、谐波污染小等特点.详细阐述了基于电压电流前馈控制和PQ解耦控制的PWM可控整流器设计方案,利用PI调节器组成电压电流双闭环控制系统.逆变器设计采用矢量控制组成转速电流双闭环控制系统.然后基于MATLAB/SIMULINK仿真平台和实际硬件平台,结合系统控制策略分别搭建了双PWM调速系统,并对调压、电机的四象限运行等各种性能进行了比较详细的验证.结果证明了主电路参数选择的正确性和控制策略的可行性. 相似文献
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针对不可控或半控整流引起电网大量谐波和无功日益严重问题,采用改进的前馈解耦控制策略对三相电压型PWM整流器设计,分析了三相电压型PWM整流器的数学模型及改进的前馈控制策略,在Matlab/Simulink平台下搭建了系统的仿真模型,与传统PWM整流器对比,并对三相电压型PWM整流器进行了系统试验。仿真与试验结果表明,该整流器能快速获得稳定的直流母线输出电压,鲁棒性良好。 相似文献
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传统的水电配电系统双电机控制方法对双电机的电压控制能力较差,整体协调程度较低,为此,基于DSP提出一种新的水电配电系统双电机协调控制方法,设计控制电路,以水电配电系统双电机的微处理器为基础,传递高压配电站发出的指令,并与配电系统的双电机协调系统进行实时信号输送,提高配电系统双电机协调控制能力,引入DSP微处理器和并联稳压器TL422调节系统双电机,同时加入开关电源 DSP电源、逆变电路和PWM缓冲区,使水电配电系统双电机协调控制电路驱动区域的电流提前中断,控制区域的电流提前开通,确定等效电子磁场和缓冲电流值后,推导出水电配电系统双电机协调控制电路的缓冲变相时间差。为验证方法效果,设定对比试验,结果表明基于DSP的水电配电系统双电机协调控制方法能较好地控制水电配电系统双电机内部电流、电压,具有极强的可操作性。 相似文献
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由于风力发电机等分布式电源的渗透率逐渐提高,对电力系统的无功平衡、电压质量和电压稳定性等因素也产生越来越多的负面影响。为提高电力系统稳定性和电压质量,以储能系统为后备支持,提出了基于虚拟同步发电机(VSG)控制的储能系统控制方法。该方法包括同步发电机(SG)的电气部分、励磁部分和机械部分,使变换器具有同步发电机的特性,可精确控制储能系统输出的有功和无功功率。最后通过Matlab/Simulink仿真模型验证了该控制方法的可行性。研究成果可为新能源并网系统安全控制提供参考。 相似文献
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Comprehensive control strategy for a variable speed cage machine wind generation unit 总被引:2,自引:0,他引:2
A comprehensive control strategy, that addresses all three control objectives in a wind generation system, i.e. control of the local bus voltage to avoid voltage rise, capture of the maximum power in the wind and minimization of the power loss in the induction generator is proposed. The control signals are the desired current wave shapes (instantaneous three-phase currents) of the rectifier and the inverter in a double-sided PWM converter system connected between the wind generating unit and the grid. Studies performed on a complete model for a variable speed cage machine wind generation unit, including wind profile, wind turbine, induction generator, PWM converter, local load and transmission line, show that even as the wind speed changes randomly, the proposed control strategy leads the system to the optimum operating conditions. 相似文献
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Resul Coteli Hakan Acikgoz Ferhat Ucar Besir Dandil 《International Journal of Hydrogen Energy》2017,42(32):20759-20771
It is necessary to convert AC to DC for the systems that do not work with AC sources. For this reason, diode and thyristor rectifiers were developed and designed. However, these rectifiers are not well suited for industrial applications requiring high performance. With the advances in power electronics and semiconductor technology, Pulse width modulation (PWM) rectifiers have been successfully employed in various industrial applications including variable-speed drives and uninterruptible power supplies. PWM rectifiers have the advantages of being low input current harmonic, adjustable input power factor, and controllable DC voltage and bidirectional energy flow. Because of all these features of the PWM rectifiers, the control and design of these rectifiers are very important topic. The aim of this paper is to control DC-link voltage of PWM rectifier with type-2 fuzzy neural system (T2FNS) instead of PI controller. For this aim, three-phase PWM rectifier with proposed controller is designed and simulated for four scenarios in this paper. A simulation model of the PWM rectifier is designed in MATLAB/Simulink and the performance of PWM rectifier with proposed controller is analyzed. 相似文献
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Ran Jiao Jie Zhu Longfei Ma Yutong Zhao Baoqun Zhang Yifeng Ding Cheng Gong Shuo Yang 《International Journal of Hydrogen Energy》2017,42(29):18174-18180
Dead-beat instantaneous power control strategy for electric vehicle off-board V2G charger is presented in this paper, to suppress harmonic pollution to power grid and realize bi-directional flow of electric energy. The charger consists of three-phase voltage source PWM grid-side converter and bi-directional dc/dc converter. A double closed-loop for three-phase voltage source PWM grid-side converter is designed firstly. And the outer voltage loop is used to keep dc bus voltage constant. The expected switching voltage components are achieved by substituting predicted instantaneous power with its instruction value, to form the inner dead-beat instantaneous power loop. Then a voltage–current double closed-loop for bi-directional dc/dc converter is proposed to implement two-stage charging, combining with constant-current charging and constant-voltage charging. Finally, the effectiveness and feasibility of the proposed control strategy are verified on the power-hardware-in-loop-simulation platform. 相似文献
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A novel stand-alone dual stator-winding induction generator with static excitation regulation 总被引:4,自引:0,他引:4
Dong Wang Weiming Ma Fei Xiao Botao Zhang Dezhi Liu An Hu 《Energy Conversion, IEEE Transaction on》2005,20(4):826-835
On the basis of the new idea of electric power integration, a novel stand-alone dual stator-winding induction generator (DWIG) system is built. In this generator, there are two sets of windings to be embedded in the stator slots. One, referred to as the 12-phase power winding, supplies power to the dc load via a 12-phase bridge rectifier, and the other, called the 3-phase excitation winding, is connected to a pulsewidth modulation (PWM) voltage source static excitation regulator (SER). A solid iron squirrel cage rotor is suitable for high speed generation. Experiments and simulations show the ac capacitors can reduce the inductance of rectifier loads and help to reduce the capacitance of the SER. A simple control methodology based on stator voltage orientation (SVO) is presented to regulate the output voltage of the 12-phase bridge rectifier in this paper. Moreover, the electric energy quality and the relative influence factors are studied by detailed experiments and analyses. The proposed system is especially suitable for self contained electrical systems, such as those found on electric vehicles, ships, and aircraft, where high performance and compact size are essential. 相似文献
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为了提高某给定海试样机的波能转换效率,提出一种组合控制策略:采用爬山法确定最优参考电流,模型预测控制算法决定MOSFET开关管的关断跟随最优参考电流。当波高降低时,如果直接采用爬山法确定最优参考电流,扰动方向会判断错误,因此加入平均功率减小阈值的判断。仿真结果表明,改进后的爬山法无论波高上升还是下降都能正确判定扰动方向,能够随波高的任意变化自适应调整Boost电路的等效负载,使磁流体波浪发电机得以输出最大功率。最后,搭建硬件电路,利用直流电压源模拟磁流体波浪发电机,通过实验验证控制策略的有效性。 相似文献