Abstract
A current source converter (CSC) based static synchronous compensator (STATCOM) is a shunt flexible AC transmission system (FACTS) device, which has a vital role as a stability support for small and large transient instability in an interconnected power network. This paper investigates the impact of a novel and robust pole-shifting controller for CSC-STATCOM to improve the transient stability of the multimachine power system. The proposed algorithm utilizes CSC based STATCOM to supply reactive power to the test system to maintain the transient stability in the event of severe contingency. Firstly, modeling and pole-shifting controller design for CSC based STATCOM are stated. After that, we show the impact of the proposed method in the multimachine power system with different disturbances. Here, applicability of the proposed scheme is demonstrated through simulation in MATLAB and the simulation results show an improvement in the transient stability of multimachine power system with CSC-STATCOM. Also clearly shown, the robustness and effectiveness of CSC-STATCOM are better rather than other shunt FACTS devices (SVC and VSC-STATCOM) by comparing the results in this paper.
Highlights
The continuous developments of electrical loads due to the modification of the society structure result in today’s transmission structure to be faced close to their stability restrictions
To improve the transient stability of the test-system after disturbances, a pole-shifting controller based current source converter (CSC)-STATCOM is connected at the mid-point of transmission line
In order to show the robustness performance of the proposed scheme for improving the transient stability of the system, after this obtained outcomes from the proposed pole-shifting controller based CSC-STATCOM are compared to the obtained outcomes from the other shunt flexible AC transmission system (FACTS) devices (SVC and voltage-source converter (VSC) based STATCOM) which have been used in some most cited papers [23, 24]
Summary
The continuous developments of electrical loads due to the modification of the society structure result in today’s transmission structure to be faced close to their stability restrictions. In many research papers [2, 9,10,11], the different types of these devices with different control techniques are used for improving transient stability In between these FACTS devices, the STATCOM is valuable for enhancement power system dynamic stability and frequency stabilization due to the more rapid output response, lower harmonics, superior control stability and small size, and so forth [7, 12]. By their inverter configuration, basic type of STATCOM topology can be realized by either a current-source converter (CSC) or a voltage-source converter (VSC) [13,14,15,16,17].
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