摘要
针对交直流混联电力系统的频率稳定问题,以抑制负荷突变引起的系统频率波动为目的,提出HVDC附加频率控制(AFC)和自动发电控制(AGC)协调控制策略。建立交直流混联电力系统模型,通过交迭分解方法解耦重叠结构的系统为2个子系统,采用极点配置法设计AFC控制器,采用AGC协调频率控制,为克服时滞和模型参数不确定性对AGC的影响,采用滑模控制理论,设计带状态时滞项的积分滑模面,结合自适应控制和PI控制的思想得到完整的滑模控制律。最后,在PSCAD/EMTDC中搭建四机两区域系统模型,对协调策略的有效性进行仿真验证,仿真结果表明该策略具有良好的调节性能和较好的鲁棒性,能有效改善交直流混联电力系统的频率稳定性。
In order to stabilize the frequency fluctuation in AC-DC hybrid power system,the coordination of HVDC auxiliary frequency control（AFC）and automatic generation control（AGC）is proposed.A model of AC-DC power system was established.The model was divided into two independent subsystems by overlap decomposition.For the subsystem,the AFC controller was designed based on pole assignment.The concept of coordinated frequency control of AFC and AGC was established.AGC was based on sliding mode control.The effect of communication delay and uncertainty of model parameters was overcome.Four machines-two areas system model was established in PSCAD/EMTDC.Simulation experiments were conducted to verify the validity of the proposed control strategy.It is demonstrated that the proposed method improves the frequency stability of the AC-DC power system when communication delay and parametric uncertainty occur.
出处
《水电能源科学》
北大核心
2017年第3期182-185,共4页
Water Resources and Power
基金
国网福建省电力有限公司电力科学研究院科技项目(SGFJDK00DWJS1500098)
关键词
附加频率控制
自动发电控制
滑模控制
时滞
参数不确定性
auxiliary frequency control
automatic generation control
sliding mode control
communication delay
parametric uncertainty
作者简介
邹朋（1991-），男，硕士研究生，研究方向为电力系统稳定与控制、高压直流输电，E-mail：zoupg09@163．com
通讯作者：王渝红（1971-），女，博士、教授，研究方向为电力系统稳定与控制、高压直流输电、新能源接入等，E-mail：yuhongwang@scu．edu．cn
