Compensation voltage control in dynamic voltage restorers by use of feed forward and state feedback scheme
Compensation voltage control in dynamic voltage restorers by use of feed forward and state feedback scheme
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DOI：
10.1109/tpel.2005.854052
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发表时间：
2005-09
影响因子：
6.7
通讯作者：
Hyosung Kim;S. Sul
中科院分区：
文献类型：
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作者：
Hyosung Kim;S. Sul
本文讨论了动态电压恢复器（DVR）补偿电压的控制。首先对DVR系统的电源电路进行分析，提出相应的电压补偿控制的控制限制和控制目标。在此功率级分析的基础上，提出了一种前馈与状态反馈相结合的dvr补偿电压控制结构。本文还讨论了DVR数字控制系统固有的时延问题。数字控制系统通常有来自采样周期、逆变器开关频率、传感器传输时间等的控制延迟。控制延迟增加了系统传递函数的维数。这使得控制系统更加不稳定。分析了DVR系统的控制性能与控制延时、闭环阻尼系数和输出滤波器参数的关系。在分析控制系统的基础上，提出了dvr控制增益和逆变器开关频率的设计准则。该理论通过一个全数字控制器的DVR实验系统得到了验证。
This paper discusses the control of the compensation voltages in dynamic voltage restorers (DVR). It first analyzes the power circuit of a DVR system in order to come up with appropriate control limitations and control targets for the compensation voltage control. Based on this power stage analysis, a combined feed forward and state feedback control structure for the compensation voltages of DVRs is developed. This paper also discusses the time delay problems inherent in the digital control system of a DVR. Digital control systems normally have control delay from the sampling period, the switching frequency of the inverter, the sensor transmission time, etc. The control delay increases the dimension of the system transfer function. This makes the control system more unstable. This paper analyzes the control performance related with the control delay, closed loop damping factor, and the output filter parameters in DVR systems. Based on the control system analysis, design guidelines are proposed for the control gains and the inverter switching frequency of DVRs. The proposed theory is verified by an experimental DVR system with a full digital controller.