准同期并列原理 ★微分预报法 △O 6,=△* △t 优点:简单 缺点:误差较大 20212/11 North China Electric Power University paget2021/2/11 North China Electric Power University page31 准同期并列原理 t i i  −  =  +   1 ★微分预报法 优点：简单 缺点：误差较大 d d  = *t