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为了提高电力系统的安全水平,有必要在无功优化中考虑静态电压稳定约束。现有模型以发电机组恒定不变的无功上下限值来确定电压稳定极限,由此可能导致无功的优化运行不满足实际发电机组的运行极限约束。建立了一种含静态电压稳定约束的无功优化新模型。其中,目标函数为正常状态的有功网损最小,约束方程包括正常状态和临界状态的潮流及其他安全约束和电压稳定裕度约束。由于采用一组基于发电机运行极限图的分段函数来准确反映发电机组的无功限制,从而克服了现有模型可能违反发电机组运行极限约束的问题。采用预测-校正原对偶内点法来求解无功优化新模型,通过IEEE30节点系统的仿真计算,验证了本文所建模型的可行性。
In order to improve the safety level of power system, it is necessary to consider the static voltage stability constraint in reactive power optimization. Existing models determine the voltage stability limit based on the constant reactive power upper and lower limits of the genset, which may result in the optimization of reactive power that does not meet the operational constraints of the actual genset. A new reactive power optimization model with static voltage stability constraints is established. Among them, the objective function is the normal state of the minimum loss of active power, constraint equations include the normal state and the critical state of the tidal current and other safety constraints and voltage stability margin constraints. As a set of segment functions based on generator operating limit map is used to accurately reflect the reactive power limit of generator set, the existing model may be violated by the limitation of generator set operating limit. The new model of reactive power optimization is solved by the predictive-rectification of the original dual interior point method. The feasibility of the proposed model is verified by simulation of IEEE30-bus system.