摘要:对开式运行的两端供电网的经济运行方式进行分析,推导出择优运行及节电计算式,同时用实例验证了两端供电网开式经济运行的节电效果显着。
0引言
开式运行方式通常采用的是:电源甲供变(配)电所A、C,电源乙供变(配)电所B;电源甲供变(配)电所A,电源乙供变(配)电所B、C。即变(配)电所C的负载是由电源甲供电,还是由电源乙供电,需在这两种运行方式中通过定量计算,优选损耗的经济运行方式。
为使分析计算简单化,计算中取电网运行电压U等于额定电压UΝ,各负载功率因数cosφ为平均值cosφp。这是因为电网运行电压在规定的范围内,与额定值的偏差大不超过10%;目前在电网中普遍应用无功补偿装置,基本实现无功就地平衡,各变(配)电所负载的功率因数都比较高,这些假设对计算结果造成的误差很小。
本文首先对3个变(配)电所电网开式经济运行方式进行分析讨论,再深入到有多个变(配)电所的电网。
13个变(配)电所电网经济运行方式的判定
1.1有功经济运行方式的临界负载令变电所A、B、C的负载分配系数分别为DA、DB、DC,其与各负载间的关系为
DA和DB的关系有;
DA+DB=1
当变电所C的负载SC由电源甲供电时,既要在线路L1C的R1C产生有功功率损失,又要引起线路L11的R11损失的增加,由负载SC所产生的总有功功率损失的ΔP甲C(kW)计算式
当变电所C的负载SC由电源乙供电时,既要在线路L2C的R2C产生有功功率损失,又要引起线路L21的R21的损失增加。由负载SC所产生的总有功功率损失的ΔP乙C(kW)计算式
以上二式中,当R11、R21、R1C、R2C、和Sσ、DC为常数时,则ΔP甲C=f(DA)和ΔP乙C=f(DA)。令ΔP甲C=ΔP乙C整理后得:
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