CN111967716B - 一种电动汽车直流充电设施的综合能效计算方法 - Google Patents
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Abstract
Description
技术领域
本发明属于电动汽车直流充电设施领域,具体涉及一种电动汽车直流充电设施的综合能效计算方法。
背景技术
现有直流充电设施能效评价存在指标单一、方法简单的问题,通常仅考虑充电效率和功率因数两个反映设备本体固有性能的指标。然而,在实际运行中,充电设施的整体运行能效还将受到其实际容量利用情况以及待机、停机功率损失等因素的影响,若仅考虑设备本体固有性能,将无法全面反映实际运行中充电设施的能效水平,并无法完成能效薄弱环节的精准定位,大幅削弱了评价结论的指导意义。
发明内容
本发明的目的在于提供一种电动汽车直流充电设施的综合能效计算方法。考虑充电设施交流直流功率转化效率、功率因数、设备利用率、停机时间、待机时间、待机损耗功率等6大直流充电设施综合能效的影响因子,建立了充电设施综合能效计算函数。目标函数体现了各影响因子与充电设施综合能效的代数关系,为定位能效薄弱环节,实现充电设施综合能效持续提升,以达到充电站整体效益最大化的目标提供理论支撑。
本发明的技术方案:
一种电动汽车直流充电设施的综合能效计算方法,包括以下具体步骤:
步骤2:在步骤1基础上,考虑充电过程中的充电设施交流输入功率转化为直流输出功率的效率η,充电设施输出功率为Wout2=PeTη;
步骤7:考虑多影响因子的直流充电设施综合能效E可以表示为:
充电设施交流输入功率转化为直流输出功率的效率η为
其中,n为单位时间T内充电设施总充电次数;ηi为单位时间T内,充电设施第i次充电的平均充电效率。
充电设施充电过程设备利用率A为
其中,Wi为单位时间T内,充电设施第i次充电消耗电量;TC为单位时间T内,充电设施充电总时长。
单位时间T表示为
T=TC+TD+TS。
所述直流充电设施综合能效E为:
与现有技术相比,本发明的有益效果是:本发明聚焦实际运行中直流充电设施的综合能效计算方法,按时间维度,从设备本体性能和客观运行工况两方面,实现了充电设施综合能效水平的体系化评价,为准确定位在运充电设施的能效薄弱环节,有效指导运行能效水平的持续提升,实现充电站整体能效最大化,具有实际理论支撑价值。
附图说明
图1为本发明方法流程示意图。
具体实施方式
下面将结合本发明实施例中的附图,对本发明实施例中的技术方案进行清楚、完整地描述,显然,所描述的实施例仅仅是本发明一部分实施例,而不是全部的实施例。基于本发明中的实施例,本领域普通技术人员在没有做出创造性劳动前提下所获得的所有其他实施例,都属于本发明保护的范围。
请参阅图1,本发明提供一种技术方案:
一种电动汽车直流充电设施的综合能效计算方法,包括以下具体步骤:
步骤2:在步骤1基础上,考虑充电过程中的充电设施交流输入功率转化为直流输出功率的效率η,充电设施输出功率为Wout2=PeTη;
步骤7:考虑多影响因子的直流充电设施综合能效E可以表示为:
充电设施交流输入功率转化为直流输出功率的效率η为
其中,n为单位时间T内充电设施总充电次数;ηi为单位时间T内,充电设施第i次充电的平均充电效率。
充电设施充电过程设备利用率A为
其中,Wi为单位时间T内,充电设施第i次充电消耗电量;TC为单位时间T内,充电设施充电总时长。
单位时间T表示为
T=TC+TD+TS。
所述直流充电设施综合能效E为:
【实例】
某直流充电设施额定输出功率Pe=60kW,某单位时间T(T=24小时)内共充电n=10次,待机时长TD=12.8小时,待机功耗PD=0.042kW。该直流充电设施在某单位时间T内第i次充电的充电效率和功率因数如下表所示。
表1某单位时间T内某直流充电设施第i次充电效率及功率因数
因此,根据本发明提出的直流充电设施综合能效计算方法,将上述数据代入计算函数,可得该充电设施在某单位时间T(24小时)内的综合能效E为:
尽管已经示出和描述了本发明的实施例,对于本领域的普通技术人员而言,可以理解在不脱离本发明的原理和精神的情况下可以对这些实施例进行多种变化、修改、替换和变型,本发明的范围由所附权利要求及其等同物限定。
Claims (6)
1.一种电动汽车直流充电设施的综合能效计算方法,其特征在于,包括以下具体步骤:
步骤2:在步骤1基础上,考虑充电过程中的充电设施交流输入功率转化为直流输出功率的效率η,充电设施输出功率为Wout2=PeTη;
步骤7:考虑多影响因子的直流充电设施综合能效E可以表示为:
5.根据权利要求3所述的一种电动汽车直流充电设施的综合能效计算方法,其特征在于,单位时间T表示为
T=TC+TD+TS。
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