The forward-backward sweep method is adopted in power flow calculation.
潮流计算采用配电网广泛使用的前推回代法。
The frequency value, sweep method and sweep rate can be input by keyboard.
频率值，扫频方式和扫频速平均可由键盘输入。
We should choose the suitable sweep signal and good test method to improve the precision and accuracy of frequency.
为提高扫描过程中频率的精度和准确度需要选择合适的扫描信号和检测方法。
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