基于容量分解的电力直流电源系统蓄电池容量计算方法

Calculation Method of Battery Capacity in DC Power Supply System Based on Capacity Decomposition

阐述了厂/站直流电源系统中阶梯负荷曲线及传统蓄电池容量计算方法,利用蓄电池容量换算系数表,得到任取的4种蓄电池的放电时间和所需蓄电池容量的系数关系曲线,分析了上述曲线的特点。基于放电初始阶段和后续阶段所需蓄电池容量的差异,提出将蓄电池容量分为基础容量和消耗容量,并研究了基础容量和消耗容量在蓄电池放电过程中的相互作用和变化趋势。在此基础上,针对典型事故放电曲线,提出了计算发电厂和变电站蓄电池容量的新算法,详细论述了新算法的计算过程及相比于传统算法的优势,最后研究了随机冲击负荷在新算法中的处理方式。采用传统电流换算法和新算法分别对5个典型放电曲线所需的蓄电池容量进行了计算,论证了新算法的合理性和有效性。

Step load curve and traditional calculation method of battery capacity in DC power supply system of plant/substation are expounded.Then coefficient relation curves between discharge time and required battery capacity of four arbitrarily selected storage batteries are obtained by using battery capacity conversion coefficient table.Characteristics of above curves are analyzed.Based on difference of battery capacity between initial discharge stage and follow-up discharge stage,the battery capacity is divided into basic capacity and consumption capacity.Mutual interaction and changing trend of the basic capacity and the consumption capacity in discharge process of the battery are studied.On this basis,for typical accident discharge curves,a new algorithm for calculating the battery capacity of a power plant or a substation is presented.Calculation process of the new algorithm and advantages to traditional algorithm are discussed.Finally,the method dealing with impact load in the new algorithm is studied.Battery capacities of five typical discharge curves are calculated with traditional current conversion algorithm and the new algorithm respectively,and rationality and effectiveness of the new algorithm are verified.