基于惯量中心动态信号的交直流互联系统稳定控制  

A Study on Control of AC/DC Power Systems Based on COI Information

作　　者：兰洲[1] 朱浩骏[2] 甘德强[1] 蔡泽祥[2] 倪以信[3] 石立宝[4] 

机构地区：[1]浙江大学电气工程学院,浙江省杭州市310027 [2]华南理工大学电力学院,广东省广州市510640 [3]香港大学电机电子工程系 [4]电力系统国家重点实验室深圳研究室(清华大学深圳研究生院),广东省深圳市518055

出　　处：《电网技术》2007年第6期14-18,共5页Power System Technology

基　　金：国家重点基础研究发展计划资助项目(973项目)(2004CB217900);国家自然科学基金资助项目(50337010)~~

摘　　要：针对交直流互联电力系统的稳定控制问题,提出了基于系统惯量中心(center of inertia,COI)动态信号的发电机励fr磁和直流功率调制综合控制方案。该方案中各发电机功角和频率动态跟踪由广域测量系统提供的系统COI动态功角和频率轨迹。直流输电线路功率调制的目标是阻尼区域COI功角和频率间的相互振荡。考虑到模型误差和外部干扰因素,采用反步法设计了非线性鲁棒控制器。对某4机2区域系统进行仿真实验,结果表明该控制方案和控制器突破了系统只能稳定于工频下的局限,增大了系统的稳定域,显著改善了系统的功角稳定性。To realize stable control of interconnected AC/DC power systems, based on dynamic signals of center of inertia （COI） an integrated control strategy for generator excitation and dc power modulation is proposed. In this strategy both rotor angle and frequency of each generator track the angle and frequency of the dynamic CO1 of the system available from wide area measurement system （WAMS）. The objective of DC power modulation is to damp the relative swing of angle and frequency of the two areas from COI. In the design of the controller the model error and external disturbances are considered, and a nonlinear robust controller is developed by back-stepping method while model errors and disturbances are considered. Simulation results of a 2-area-4-machine AC/DC power system show that the proposed control strategy can break through the traditional limitation that the integrated AC/DC power system can merely be stable under power frequency and enlarge the stability region of the power system as well as noticeably improve the transient stability of the power system.

关 键 词：电力系统 励磁控制:直流功率调制 暂态稳定 惯量中心(COI) 鲁棒控制 

分 类 号：TM711[电气工程—电力系统及自动化]