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Background: Lumped controlled series compensation devices can increase the transmission limit and the stability of the network. However, the studies conducted by V.A. Venikov, V.A. Stroyev, Ju.G. Shakaryan and V.K. Fokin suggest that usage of these devices may lead to unacceptable overvoltages on series compensation output terminals and oscillatory instability. To stabilize voltage levels it is common to use unregulated shunt reactors that have a negative impact on the transmission limit. With that in mind it is necessary to evaluate voltage stabilization efficiency of the shunt reactors with discrete and smooth control and their effect on system stability. Materials and methods: A.M. Lyapunov’s first approximation method, Newton's method, one parameter D-decomposition method, and P.S. Zhdanov’s stability criterion are used. Results: The paper represents analysis of the effect of discrete and smooth power control of shunt reactors on the transmission limit. Their usage can improve this limit to 10 %, stabilize the voltage levels in the network and enhance the stability of the electrical power system. Conclusions: The number of shunt reactors at discrete regulation and the control law at smooth regulation should ensure acceptable levels of voltage at the output terminals of the series compensation device and maximize the transmission limit, while maintaining oscillatory stability. The study results can be used in steady state and transient stability calculations of the systems containing flexible power transmission lines with controlled devices, as well as for development of control systems of such devices.

Regulation of shunt reactor power for improving stability of electrical power systems with a controlled series compensation device