Robust optimal transmission switching for wind farm‐integrated power systems from a perspective of steady‐state security region

Abstract

Optimal transmission switching (OTS) is a new method in improving operational security and economy of power systems. However, with continuous improvement in wind power penetration level, how to rationally describe the uncertainty of wind power play an important role in determining robustness of the OTS model. Against this issue, a system robust domain (SRD) developed by steady‐state security region is proposed to model the uncertainties of wind power outputs in OTS. This modelling method focuses on the robust domain of system rather than the robust intervals of variables in conventional robust optimisation, thus overcomes the high dependence of conventional robust optimisation on accurate estimation of each uncertainty intervals. SRD‐OTS is formulated and a decomposition algorithm is employed to obtain the optimal solution. The obtained optimal solution can maintain the operational security in the worst case of wind power outputs and minimize operational cost with the forecasted wind power outputs. In addition, robustness of the proposed SRD‐OTS can be adjusted by an uncertain budget. The numerical results on the IEEE test system verify effectiveness of the proposed SRD‐OTS and show that the optimal solution is still robust with a relative lower accuracy of wind power prediction.

The Role of Optimal Transmission Switching in Enhancing Grid Flexibility: A Review

“…The role of OTS in accommodating renewable energy and considering deep peak regulation is presented in [131]. In [132], the steady-state security region model using OTS is proposed and solved by a decomposition approach. Additionally, [133] discusses the impact of OTS on a hybrid wind/PV generation, where the AC-OPF model is solved using a combination of a genetic algorithm and a non-linear primal-dual interior point algorithm.…”

Optimal transmission switching for power system integrating renewable energy based on analytical target cascading

“…A large number of studies on OTS that consider renewable energy sources have been conducted. In Liu et al (2022), an OTS model with renewable energy considering structural optimization was proposed, which reduces the system operation cost and cost of loss due to network blockage after failure by OTS. In Ogundairo et al (2022), a two-stage stochastic optimization model that considers OTS and energy storage allocation was constructed to improve the economy of the power grid by incorporating renewable energy sources.…”