较大的采用周期将使其不稳定。采样周期应不得大于总计时间常数的1/10(或极端情况下的1/5)。举例,如果PV近似为最终值2秒的2/3时,则采样周期应小于0.2秒,极端情况下为0.4秒。另一方面,采样周期也不得太小，如小于总计时间常数的1/1000
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