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Design of Nonlinear Model Predictive Emergency Voltage Controller Using Radau Collocation

Wang Shuang1 Liu Mingbo1 Hu Bo2 Li Haichen1 Xie Min1(1.Guangdong Key Laboratory of Clean Energy Technology South China University of Technology Guangzhou 510640 China 2.State Grid Energy Research Institute Beijing 100052 China)  
The nonlinear model predictive control method is applied to design of emergency voltage controller.Based on quasi-steady-state approximation,the receding dynamic optimization model is established in order to maintain long-term voltage stability by coordinating different kinds of voltage control means.In this receding dynamic optimization problem,the objective function synthetically considers both voltage deviation and control cost,and equality constraints include continuous and discrete time differential-algebraic equations.To enhance computational efficiency of solving this receding model,Radau collocation method is used to convert this model into a nonlinear programming problem which can be solved using the interior-point solver given by IPOPT.Simulation results on New England 10-machine 39-bus system verify effectiveness of the proposed method.
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