分数阶滑模控制策略提高电力系统暂态稳定性研究

电力系统暂态稳定是电力系统遭受大干扰能够恢复稳定运行的能力，是电力系统安全稳定运行的重要基础。电力系统是一个高度复杂的、强耦合的非线性系统，PSS作为线性控制策略不能够有效抑制大扰动。基于滑模控制，分数阶微积分和有限时间稳定，提出了分数阶滑模控制策略来提高电力系统暂态稳定，使系统能够在有限时间内恢复稳定运行。首先，通过输入输出线性化方法解耦非线性电力系统。然后，提出分数阶滑模控制器并给出其设计和证明过程。同时，给出电力系统在所提出的控制策略性下的收敛时间。最后，在3机9节点电力系统中应用分数阶滑模控制器调节发电机的励磁提高电力系统的暂态稳定，验证了所提出的分数阶滑模控制器的有效性和优越性。

Power System Transient Stability Improved With Fractional-order Sliding Mode Control Strategy

Power system transient stability is the ability of power system to recover stable operation under large disturbance，and it is an important basis for the safe and stable operation of the power system. Power system is a highly complex and strongly coupled nonlinear system， PSS cannot effectively suppress large disturbances as a linear control strategy. Therefore， based on the sliding mode control， fractional calculus and finite time stability， the fractional sliding mode control strategy is proposed to stabilize the power system in finite time. Firstly， the nonlinear power system is decoupled by input-output linearization. Then，the design and proof process of fractional order sliding mode controller and the convergence time of power system under the proposed control strategy are given. Finally，the fractional-order sliding mode controller is used to regulate the excitation of the generator in the 3-machine 9-node power system to improve the transient stability of the power system， the effectiveness and superiority of the proposed fractional order sliding mode controller are verified.