无电压传感器的准直接功率并网变流器控制方法

发布时间：2018-03-27 12:08

本文选题：无电压传感器　切入点：两相静止坐标系　出处：《电机与控制学报》2017年05期

【摘要】：针对传统基于虚拟电机磁链的无电压传感器方法电压波动较大问题,结合二阶广义积分原理与占空比信号提出一种电压观测器以代替电压传感器获取更加精准的网侧电压信息。依据瞬时功率理论,在两相静止坐标系下,采用基于PQ开环的准直接功率电压定向控制策略,实现了并网变流器的四象限工作状态运行,电流内环采用比例谐振控制器保证指令电流快速无差跟踪。对比分析网侧电压信号谐波畸变率,实验波形表明:所提方法不需要电压传感器与电流解耦控制环节,且谐波含量低,可获得较传统方法更准确的网侧电压信号,提高了系统运行的稳定性与可靠性。
[Abstract]:Aiming at the problem of voltage fluctuation in traditional voltage-sensorless method based on virtual motor flux linkage, Based on the second order generalized integral principle and duty cycle signal, a voltage observer is proposed to obtain more accurate voltage information on the grid side instead of the voltage sensor. According to the instantaneous power theory, in the two-phase stationary coordinate system, a voltage observer is proposed. Based on PQ open-loop quasi-direct power voltage oriented control strategy, the four-quadrant operation of grid-connected converter is realized. The proportional resonance controller is used in the inner loop of current to ensure fast differential tracking of the command current. By comparing and analyzing the harmonic distortion rate of the voltage signal on the grid side, the experimental waveform shows that the proposed method does not need the decoupling control link between the voltage sensor and the current. With low harmonic content, more accurate voltage signals can be obtained than the traditional methods, and the stability and reliability of the system can be improved.
【作者单位】：广西电力系统最优化与节能技术重点实验室;广西大学电气工程学院;
【基金】：广西科学研究与技术开发项目(1598008-3) 南宁市科学研究与技术开发计划(20131048)
【分类号】：TM46

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