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针对一系列预想故障,提出了一种恢复潮流可行解的优化控制策略。该策略采用恢复潮流解和恢复可行解的两步法,以最小控制代价为目标,把恢复系统可行解的控制问题转化为一类非线性规划问题求解。针对无潮流解的故障,利用最优切负荷算法恢复潮流解,同时利用模式分析法研究了节点注入无功功率对应关键电压失稳模式的参与因子,这些参与因子决定了在随后恢复可行解的过程中负荷切除和发电机出力调整的优先权。采用考虑离散变量的原—对偶内点法求解上述非线性优化问题。算例仿真表明,通过模式分析选择优化变量减小了优化问题的规模,提高了优化计算的收敛速度。
Aiming at a series of expected faults, an optimal control strategy for the restoration of tidal current feasible solutions is proposed. This strategy adopts the two-step method of restoring tidal current solution and restoring feasible solution, and takes the minimization control cost as the goal, and transforms the control problem of the feasible solution of the restoration system into a solution to a class of nonlinear programming problems. In order to solve the problem of no-flow solution, the optimum solution of load shedding is used to recover the power flow solution. At the same time, the mode analysis method is used to study the participation factors of the key voltage instability mode with node reactive power injection. These factors determine the feasible solutions Priority for load shedding and generator output adjustment during the process. The original-dual interior point method considering discrete variables is used to solve the above nonlinear optimization problem. The simulation results show that selecting optimization variables through pattern analysis reduces the size of optimization problem and improves the convergence speed of optimization calculation.