| 摘要: |
| 首先分析了常用的2种同期捕捉算法：算法1是利用相角差与滑差及滑差加速度的关系进行合闸时刻预测，算法2是基于相角差序列、运用现代预测理论预测合闸时刻。对这2种算法进行了改进。针对算法1，采用插值原理对较短时间内的相角差进行估计，并判断估计值是否满足合闸条件，如果条件满足，则发合闸命令，否则继续执行算法。针对算法2，提出了加入残差分析的抛物线拟合预测算法，比线性拟合更加精确。改进了对算法有直接影响的相角差量测系统，即通过方波过零比较获取最原始的数据，通过插值计算估计值来增加数据密度。实验证明改进后的算法使得同期合闸质量有了明显提高。 |
| 关键词: 准同期 导前时间 预测 分段辨识 插值 外推值 残差分析 |
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| Improvement and implementation of sync-capture algorithm |
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HAN Jin, HUANG Jian
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Wiscom System Co.，Ltd.，Nanjing 211100，China
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| Abstract: |
| Two common sync-capture algorithms are analyzed. Algorithm 1 predicts the closing time according to the relationship among phase angle difference，slip frequency and slip frequency acceleration，while algorithm 2 applies the contemporary forecast theory to predict the closing time based on the phase angle difference order. Both are improved. For algorithm 1，the phase angle difference between short time interval is estimated with interpolation principle and the closing command is issued if the closing condition is satisfied，otherwise continue the algorithm. For algorithm 2，the parabolic curve fitting prediction algorithm combined with the residual analysis is added，which is more accurate than linear fitting，and the measuring system of phase angle difference，which has direct influence on algorithm，is improved by acquiring the original data at the zero-crossing-point of square wave and by increasing the data density through data interpolation. Experimental results prove that the improved algorithms enhance obviously the quality of synchronous closing. |
| Key words: synchronization leading time forecasting segmentation identification interpolation extrapolation residual analysis |
