自动按频率减负荷装置各轮最佳断开功率的计算机算法

Computer Algorithm on Optimum Individual Grades Turn Off Powers in an Automatic Low Frequency Decreasing Loads Equipment

按极值原理推出自动按频率减负荷装置（ＺＰＪＨ）误差为最小的条件，然后联立求解ＺＰＪＨ装置总的减负荷功率与各轮减负荷功率的计算等式，求出恢复频率的最佳值，再求ＺＰＪＨ各轮的断开功率，此时的结果为最佳断开功率，即ＺＰＪＨ装置的选择性最佳。

According to the extreme value principle,the minimum condition of theerror in an automatic low frequency decreasing loads equipment will be derived in this paper.Then through solving simuItaneous equations which contain total decreasing loads power inthe equipment and individual grades turn off powers,an optimum recovering frequencycould be evaluated,and then optimum individual grades turn off powers.On this condition,the result will be optimum, or the selectivity of the equipment should be optimum.