共查询到18条相似文献,搜索用时 62 毫秒
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本文针对UPS逆变器设计提出了一种离散滑模控制算法,采用双环结构,包括电流预测器和电流控制器:仿真结果表明.这种算法具有抑制输出电压波形失真、电压调节性能好、带载能力强等特点。 相似文献
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简单介绍了Delta变换型UPS的组成和特点,进而详细分析了并联主逆变器和串联Delta逆变器的工作原理及其在UPS系统中的重要作用.同时对主逆变器和Delta逆变器的SPWM控制器建立了数学模型.最后通过对主逆变器和Delta逆变器的仿真结果的详细分析,验证了Delta变换型UPS整机运行方式. 相似文献
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UPS逆变器数字控制技术 总被引:3,自引:0,他引:3
针对不间断电源(UPS)逆变控制技术数字化的趋势,论述了当前UPS逆变控制中存在的各种数字化智能控制技术。通过对智能控制理论数学建模的分析,阐述了它们的控制原理。最后,指出了UPS逆变数字化控制的发展方向。 相似文献
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在非线性负载电流峰值系数较大时,不间断电源UPS(uninterruptible power supply)逆变器的输出电压的总谐波失真度THD(total harmonic distortion)难以达到标准要求。基于dq0同步旋转坐标系的谐波抑制方法可消除指定次谐波,从而改善输出电压的THD。介绍了该谐波抑制方法应用于三相四线制UPS逆变器的控制环路结构,并推导了谐波抑制环在dq0同步旋转坐标系下的控制方程,从而得到了环路被控系统的动态模型。在此基础上,改进了谐波抑制环的环路结构以实现dq轴在低频段的解耦,并设计了环路控制参数。最后,在三相四线制T型三电平逆变器平台上通过实验验证了谐波抑制环设计的有效性。 相似文献
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Slide mode control (SMC) is recognized as the most robust control with high stability, while the proportional-resonant (PR) control shapes the output waveform closely according to the reference sinusoidal signal. Keeping in view the characteristics of slide mode and PR control, a cascaded controller is proposed for bipolar single-phase uninterruptible power supply (UPS) inverter. The outer voltage loop uses the PR control while the inner loop uses the SMC. Chattering in the SMC has been removed using smoothed control law in narrow boundary layer condition. The stability of the controller has been analyzed using Lypunov stability criteria. The smoothed control law applied to the pulse width modulator results in fixed switching frequency of the inverter. The performance of the controller has been analyzed for single-phase inverter through simulations and experiments for both the linear and non-linear loads. The performance of controller has been compared with the other techniques of SMC and standard controllers. The proposed controller shows significant improvement in terms of reducing the total harmonics distortion to 0.5% for linear load and 1.25% for non-linear load, strong robustness, and fast response time of only 0.3 ms. 相似文献