本文主要分析两电源线性电路，该电路共有三种类型，分别是流控型双口网络、压控型双口网络和混合型双口网络.通过测量等方法，在已知双口网络VCR 的情况下，可以得到两个电源功率各部分的物理分布.每个电源的功率包括两部分，一部分等于该电源单独接入电路时，所提供的功率; 另一部分是由于两个电源共同接入电路时，相互作用而增加的功率，取决于两个电源的大小，以及电路参数.根据互易定理，对于不含受控源的流控型双口网络和压控型双口网络，每个电源由相互作用而增加的功率相等，即电路增加的损耗功率，由两个电源平均分摊.对于不含受控源的混合型双口网络，由于相互作用，一个电源增加的吸收功率大小与另一个电源增加的提供功率大小相等，即两个电源功率之和等于每个电源单独接入电路时的功率之和.这种情况下，相互作用的效果是一个电源在对另一个电源进行充电.该研究结果具有普适性，可以辅助解决电网功率来源问题，并可以解决其他电子电路中功率的来源问题.

This paper mainly analyses a linear circuit with two power sources. There are three types of this circuit: the current - controlled dual - port network，voltage - controlled dual - port network and hybrid dual - port network. A dual-port network VCR can be obtained by measuring and other methods. The physical distribution of each part of the power of two power sources can be obtained when the VCR of two-port network is known. The power of each power supply consists of two parts. One part is equal to the power provided by the power supply when it is connected to the circuit separately. Another part is the increased power due to the interaction between the two power sources when they are both connected to the circuit. The increased power depends on two power sources and circuit parameters. According to the reciprocity theorem，when there is no controlled source，for current-controlled twoport networks and voltage-controlled two-port networks，the increased power of each power source due to interaction

is equal. That is to say，the increased loss power of the circuit is shared equally by the two power sources. For a hybrid dual-port network，when there is no controlled source，the increased absorption power of one power source is equal to the increased supply power of another power source due to the interaction. The sum of the power of both power supplies is equal to the sum of the power of both power supplies when it is connected to the circuit separately. In this case，the effect of interaction is that one power source charges another power source. The results of this study are universal. It can help one to solve the power source problem of power grid，and can also solve the power source problem of other electronic circuits.