一种新的优化协调控制在轻型直流输电中的应用(英文)

APPLICATION OFA NOVEL OPTIMAL COORDINATED CONTROL TO HVDC LIGHT

轻型直流输电是一种新型的直流传输技术,采用电压源型(VSC)换流站以及PWM 控制技术。建立了轻型直流输电系统模型,提出一种在发电机励磁和轻型直流输电之间优化协调控制方法,用于改善系统暂态稳定和抑制系统故障后振荡。作为算例,该协调控制方法被用于含有轻型直流输电的多机系统,并将该优化协调控制与发电机励磁、轻型直流输电系统相互独立的控制做一比较,仿真结果表明,在系统大小扰动下,该控制能够给系统提供更好的阻尼特性。

HVDC Light is a new HVDC transmission system, based on Voltage Source Converters (VSC) and Pulse Width Modulation (PWM). The mathematical model of HVDC Light is established, an optimal coordinated control between the generator excitation and HVDC Light is proposed. The proposed controller is used to improve transient stability of the power system and to damp prolonged oscillation after a fault is cleared. Then the optimal coordinated control algorithm is applied to multi-machine power system with HVDC Light. The comparison is made between the proposed controller and independent controller for generator excitation and HVDC Light, the simulation results demonstrate that the proposed control strategy provides better damping characteristics.