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Abstract
A new algorithm simulating the impacts of the VAR supporting devices such as the static var compensators (SVCs) and the synchronous condensers (SCs) under condition of symmetrical disturbances in multi-machine power system is mentioned. Some typical numerical examples are presented in this article.
 The comparisons of variation of the state parameters, such as the voltage, frequency, reactive power outputs and asynchronous torques…are simulated under condition of the action of the automatic voltage regulation systems of generators and of the VAR supporting devices.
 The transient energy margins are calculated and compared to assess the transient stability in multi-machine power system. Basing on this algorithm, the PC program uses the elements of the eigen-image matrix to bring the specific advantages for the simulation of the transient features of state variables.
Highlights
The control of voltage levels is accomplished by controlling the production, absorption and flows of reactive power
The device use for voltage control may be the static var systems (SVCs), the synchronous machines/condensers or regulating transformers
A static VAR system is an aggregation of Static VAR Compensator, the mechanically switched capacitors and reactors. whose outputs are coordinated
Summary
The control of voltage levels is accomplished by controlling the production, absorption and flows of reactive power. The device use for voltage control may be the static var systems (SVCs), the synchronous machines/condensers or regulating transformers. Trang 16 provide reactive power compensation, together with the generators they have specific influence to the steady-states and the transient states in the power system. A static VAR system is an aggregation of Static VAR Compensator, the mechanically switched capacitors and reactors. In contrast to the SC, the SVC, being composed of the thyristor-switched reactors and capacitors, becomes a fixed capacitive admittance at full output. Referring to (Prabha Kundur, 1993) the performance of the SVC is instantaneously provide an amount of reactive power to hold the voltage at a specific bus in power network with its V/I characteristic showing in fig. as follow. ; XThe is thevenin reactance at the bus of SVC locating in multi-machine power system Where EThe is thevenin e.m.f. ; XThe is thevenin reactance at the bus of SVC locating in multi-machine power system
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