Abstract
The growing number of renewable energy plants connected to the power system through static converters have been pushing the development of new strategies to ensure transient stability of these systems. The virtual synchronous generator (VSG) emerged as a way to contribute to the system stabilization by emulating the behavior of traditional synchronous machines in the power converters operation. This paper proposes a modification in the VSG implementation to improve its contribution to the power system transient stability. The proposal is based on the virtualization of the resistive superconducting fault current limiters’ (SFCL) behavior through an adaptive control that performs the VSG armature resistance change in short-circuit situations. A theoretical analysis of the problem is done based on the equal-area criterion, simulation results are obtained using PSCAD, and experimental results are obtained in a Hardware-In-the-Loop (HIL) test bench to corroborate the proposal. Results show an increase in the system transient stability margin, with an increase in the fault critical clearing time (CCT) for all virtual resistance values added by the adaptive control to the VSG operation during the short-circuit.
Highlights
The technology development involved in the power system to process the generated and transmitted energy, especially with the large-scale use of static power converters, leads to a more significant concern with the power system stability
The system proposed in the previous section was simulated in a HIL environment, in order to system found proposed in the previousanalysis section made was simulated in ordergoal to verifyThe the results in the theoretical in Sectionin2.a the HIL test-bench the results found ininthe theoretical analysis made the HIL test-bench goal is isverify to check if an increase simulated follows the in adoption of the proposed adaptive control, to check if an increase in simulated follows the adoption of the proposed adaptive control, proving its contribution to enhancing the system transient stability
In order to shorten the process of finding the critical clearing time (CCT), the theoretical CCT found is used as a starting point, and the bisection method is of finding the CCT, the theoretical CCT found is used as a starting point, and the bisection method is adopted with an accuracy of 1 ms
Summary
The technology development involved in the power system to process the generated and transmitted energy, especially with the large-scale use of static power converters, leads to a more significant concern with the power system stability. With the increasing number of large-scale non inertial power sources being connected to the grid, and the VSG proving to be a viable alternative to stability, this work’s motivation is to propose an adaptation of the VSG virtual resistance parameter, to improve the transient stability of these non-inertial VSG interface converters. As seen in the papers discussed earlier, most adaptive control strategies proposed in the literature are focused only on the systems’ frequency stability in the presence of small-scale VSG, as in microgrids In these propositions, only the parameters related to the synchronous generator electromechanical modeling are manipulated, in this case, inertia and damping.
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