基于曲线拟合法的新型定制电力设备快速检测算法

定制电力配套设备的运用可有效地补偿电压暂降和瞬时断电,其研究开发过程中遇到的一大难题是:寻求快速算法,以便在3ms以内检测出电压暂降和瞬时断电。在分析常规保护用检测算法如有效值计算法、缺损电压法、辨别导数算法、三相d-q分解法、利用单相电压延迟60°构造三相虚拟电压d-q变换法和利用求导数法构造三相虚拟电压d-q变换法的优缺点基础上,提出了基于曲线拟合法的快速检测算法。通过研究两采样值积曲线拟合法、三采样值积曲线拟合法的优缺点,比较曲线拟合法与前面提到的检测算法,并比较两采样值积曲线拟合法与三采样值积曲线拟合法,得出两采样值积曲线拟合法更适合于在定制电力配套设备中运用。基于DSP仿真器上编程仿真,分析得到的各种检测算法处理电压暂降的结果波形,证实了该观点。

Fast detection algorithm based on curve fitting algorithm for custom power device

The key technique in the development of power custom devices,which can effectively compensate voltage sags and short interruptions,is the quick detection of voltage sags and short interruptions in 3 ms.Based on the study of different detection algorithms used in protects,such as virtual value algorithm,imperfect voltage algorithm,derivative algorithm,three phase d-q decomposition algorithm,60-degree-delay dummy three phase d-q transform algorithm and differentiate dummy three phase d-q transform algorithm,a fast detection algorithm is presented based on curve fitting.Both two-point curve fitting algorithm and three-point curve fitting algorithm are researched.After comparing all these detection algorithms,it is concluded that,the two-point curve fitting algorithm is the most practical for power custom devices.Simulation of voltage sag processing by different algorithms on DSP proves the conclusion.