# Thévenin's theorem

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## Thévenin's theorem

[tā·vȯ′naz ‚thir·əm]
(electricity)
A theorem in network problems which allows calculation of the performance of a device from its terminal properties only: the theorem states that at any given frequency the current flowing in any impedance, connected to two terminals of a linear bilateral network containing generators of the same frequency, is equal to the current flowing in the same impedance when it is connected to a voltage generator whose generated voltage is the voltage at the terminals in question with the impedance removed, and whose series impedance is the impedance of the network looking back from the terminals into the network with all generators replaced by their internal impedances. Also known as Helmholtz's theorem.
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References in periodicals archive ?
The Thevenin equivalent parameters of a power system are time dependent and represent an aggregation of the system's operating conditions and can therefore be considered as the state variables .
The fundamental method for calculating the Thevenin equivalent of an unknown circuit, in this case the distributed system, is to obtain the open circuit voltage and short circuit current.
In this scenario, the Thevenin equivalent voltage and resistance 'seen' by each node differs ([V.
An on-line RLSEbased algorithm is used to determine the Thevenin equivalent parameters as an aggregation of the system's operating conditions so that it can act accordingly.
Wong, "On-line estimation of Thevenin equivalent with varying system states," IEEE Power and Energy Society General Meeting--Conversion and Delivery of Electrical Energy in the 21st Century, Pittsburgh, pp.
Li, "A preliminary study on the Thevenin equivalent impedance for power systems monitoring", IEEE International Conference on Electric Utility Deregulation and Restructuring and Power Technologies, Shandong, pp.
Thevenin equivalent model of the stand-alone DC system--as observed by a single node--represents an aggregation of the system's state
This circuit has a similar form to the Thevenin equivalent circuit of a voltage source behind an impedance with one important distinction.
th] values for a Thevenin equivalent circuit to simulate various battery characteristics.
2] and loaded Q at x cm are calculated by the Thevenin equivalent circuit and the definition of the S parameter.
n]) shown in Figure 15 is the Thevenin equivalent of the whole sample power system looking at PCC bus.

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