带阻抗观测器的单相逆变器抗扰控制

发布时间：2018-03-15 06:03

本文选题：单相逆变器　切入点：抗扰控制器　出处：《电机与控制学报》2014年07期 　论文类型：期刊论文

【摘要】：针对以单相逆变器为功率接口的太阳能发电系统中电能的快速随机波动和非线性负载接入时产生的谐波问题,提出一种基于阻抗观测器的抗扰控制策略。该策略主要把造成逆变器输出电压的波动和产生的谐波等随机量作为一种干扰,将谐波的影响、温度变化的影响、线路和滤波器的阻抗参数变化等引起的电压变化量等效为阻抗上的电压降。通过构造的阻抗观测器来估算出产生压降的等效电阻、等效电感和等效电容,然后应用抗扰控制器来消除干扰,自动补偿输出电压变化,使逆变器输出标准正弦波,提高电能质量。仿真和实验结果表明,不论是逆变器直流侧电压波动,还是非线性负载的接入,逆变器都能够输出标准电压正弦波。
[Abstract]:Aiming at the problem of fast random fluctuation of electric energy and harmonic generated when nonlinear load is connected in solar power generation system with single-phase inverter as power interface, A disturbance rejection control strategy based on the impedance observer is proposed, in which random variables such as the fluctuation of the output voltage and the harmonic produced by the inverter are taken as a kind of interference, the influence of the harmonic and the influence of the temperature change are taken as a kind of interference. The voltage variation caused by the impedance parameter change of the circuit and filter is equivalent to the voltage drop on the impedance. The equivalent resistance, equivalent inductance and equivalent capacitance that produce the voltage drop are estimated by the constructed impedance observer. Then the disturbance rejection controller is used to eliminate the interference and compensate the output voltage change automatically. The output standard sine wave of the inverter is improved and the power quality is improved. The simulation and experimental results show that the DC side voltage fluctuation of the inverter is not only the same as that of the inverter. Or nonlinear load access, inverter can output standard voltage sine wave.
【作者单位】：东北大学信息科学与工程学院;
【基金】：辽宁省自然科学基金(20102068) 沈阳科技计划-应用基础研究专项(F13-316-1-53)
【分类号】：TM464

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