基于多类型FACTS装置的复杂电力系统时滞相关鲁棒阻尼控制方法

本项目针对当前大规模复杂电力系统普遍存在的低频振荡问题，结合现代智能电网信息技术、电力电子变换技术和控制技术的新发展，研究一种考虑广域信号时滞影响的多类型柔性交流输电系统（FACTS）时滞相关鲁棒阻尼控制方法，以同时抑制多个低频振荡模式，提高大规模互联电力系统的运行稳定性和安全性。通过分析基于广域测量系统的互联电力系统，从理论上揭示其发生低频振荡的成因以及造成这些成因的作用机制；考虑电压源型和电流源型换流器的交直流变换特性与实际控制特性，研究多类型FACTS控制系统的小信号稳定性；分析广域信号时滞对电网的影响，建立电力系统时滞相关动力学系统模型描述；应用自由权矩阵方法，研究一类对时滞效应具有更大容忍度的稳定性新判据，由此提出一类新颖的时滞相关广域阻尼控制设计方法，实现多个广域阻尼控制器的协调鲁棒控制。研究成果将开辟电力系统稳定性分析与控制的新领域，对促进智能电网的发展具有重要的科学意义。

Aiming at the low frequency oscillation (LFO) problem of the large-scale and complex power systems, and combing the newly development of modern information technology of smart grids, power electronics conversion technology and advanced control technology, this project investigates a delay-dependent robust damping control strategy for multiple flexible AC transmission systems (FACTS) devices, in order to damp multiple LFO modes and improve the stability and the security of large-scale interconnected power systems. The reasons of exciting LFO as well as the action mechanism of the LFO are revealed in theory by means of analyzing interconnected systems with wide area measurement systems (WAMS). The small signal stability of multiple FACTS control system is analyzed by considering the AC/DC conversion characteristics and the real control characteristics of the voltage source converter (VSC) and the current source converter (CSC). The delay-dependent dynamical model of power systems is established by considering the delay effects of wide area signals, and the stability condition of such model on the delay effects is addressed by a free weighting matrix method. Based on this, a class of new design methods about the delay-dependent wide area damping control system is proposed, and the coordinated robust control of multiple wide area damping controllers is realized. The research results of this project has significant science meanings for opening up a new field for the power system stability analysis and control as well as the promotion of the development of smart grids.