并联运行发电机组台数对功率分配差度的影响

随着并联运行发电机组台数的增加,并联运行的组合快速增长,采用试验方法逐一验证各组合的功率分配差度变得不太现实。在已知各参与并联运行发电机组的稳态调速率、稳态电压调整率的前提下,本文推导了计算并联运行发电机组功率分配差度的公式。反之,根据要求的功率分配差度指标,本文给出了可以符合并联运行要求的发电机组的稳态调速率、稳态电压调整率的容许差别。在给定功率分配差度指标的情况下,随着并联运行发电机组台数的增加,发电机组之间调速、调压特性的容许差别会减小。有功功率分配差度对无功功率分配差度有较大影响,在确定并联运行发电机组调速、调压特性的容许差别时,功率分配差度的限值要按小于规范要求值来考虑。

Influence of Number of Parallel Operation Generator Sets on Accuracy of Power Sharing

Because of the rapid increasing of the combination schemes of parallel operation generator sets with the number increasing of generator sets, it is not practical to verify the accuracy of power sharing for each scheme by experimental method. In this paper the equations for calculating the accuracy of power sharing of parallel operation generator sets are derived when the steady speed and voltage regulation ratio of every paralleled generator set are fixed. On the other hand, when the required accuracy of power sharing is fixed, the satisfying conditions for steady speed and voltage regulation ratio of every paralleled generator set are given. It is shown that for a certain accuracy of power sharing, the permitted difference of steady speed and voltage regulation ratio between paralleled generator sets decrease with the number increasing of parallel operation generator sets. The accuracy of active power sharing affects the accuracy of reactive power sharing obviously. When calculating the permitted difference of steady speed and voltage regulation ratio between paralleled generator sets, the required accuracy of power sharing must be considered as less than standard demands.