Two-Stage Optimization Control of Transient Overvoltage Based on Trajectory Sensitivity
Wang Changjiang1, Jiang Tao1, Liu Fusuo2, Chen Houhe1, Lu Huawei1
1. Key Laboratory of Modern Power System Simulation and Control & Renewable Energy Ministry of Education Northeast Electric Power University Jilin 132012 China; 2. State Key Laboratory of Smart Grid Protection and Control Nanrui Group Corporation Nanjing 211106 China
Abstract In order to mitigate the transient overvoltage of high voltage direct currents (HVDC) sending-side system when wind power is transmitted via HVDC, a two-stage optimization control strategy for transient overvoltage based on trajectory sensitivity is proposed in this paper. At first, an optimization control model of transient overvoltage is constructed, whose objective is to minimize the control cost and the deviation between bus voltage predictive trajectories and their reference values comprehensively. The trajectory sensitivities of transient overvoltage and the recovery voltage with respect to control variables are computed by means of employing trajectory sensitivity technique, and hence this receding nonlinear control model of transient overvoltage is simplified into a quadratic programming model whose independent variables are increments of control variables, which enhances the control efficiency of transient overvoltage. Then, in order to solve the transient overvoltage instability problem, the control quantity change of the transient overvoltage prevention control is calculated before the fault, and a transient overvoltage prevention control is implemented to avoid serious transient overvoltage hazards. If the recovery voltage exceeds the limit, the recovery voltage control is further implemented. The control quantity change of the recovery voltage control is calculated, and the recovery voltage is adjusted to a safe operating range. The proposed control method can both suppress transient overvoltage and ensure the safety of recovery voltage, which provides a reference for a dispatcher to perform transient overvoltage control. Finally, the simulation results on the modified IEEE-39 bus system demonstrate the effectiveness of the proposed control method.
Wang Changjiang,Jiang Tao,Liu Fusuo等. Two-Stage Optimization Control of Transient Overvoltage Based on Trajectory Sensitivity[J]. Transactions of China Electrotechnical Society, 2021, 36(9): 1888-1900.
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2021, Vol. 36 
