CAJ | 학술논문

现有的电力系统非线性励磁控制器多基于状态反馈设计,需要测量同步发电机的转子角和部分变量的微分,并且控制器以发电机相对转子角驱至参考值为控制目标,在系统的网络参数或运行方式变化时无法维持机端电压恒定。采用输出反馈的方式提出一种新的非线性励磁控制器设计方法。分别针对单机无穷大系统及多机系统,对系统的非线性数学模型提出了新的变换方法,将其转换为以机端电压偏差、角速度偏差和有功功率偏差为状态变量的不确定线性系统,进而应用一种基于线性矩阵不等式（linear matrix inequality,LMI）的鲁棒控制理论设计出控制器。该控制器不需要测量发电机转子角及任何变量的微分,不依赖于电力系统某个特定运行点,能适应系统网络参数与运行方式变化,较好地抑制扰动并实现机端电压调节功能。仿真结果验证了所得结论。
현유적전력계통비선성려자공제기다기우상태반궤설계,수요측량동보발전궤적전자각화부분변량적미분,병차공제기이발전궤상대전자각구지삼고치위공제목표,재계통적망락삼수혹운행방식변화시무법유지궤단전압항정。채용수출반궤적방식제출일충신적비선성려자공제기설계방법。분별침대단궤무궁대계통급다궤계통,대계통적비선성수학모형제출료신적변환방법,장기전환위이궤단전압편차、각속도편차화유공공솔편차위상태변량적불학정선성계통,진이응용일충기우선성구진불등식（linear matrix inequality,LMI）적로봉공제이론설계출공제기。해공제기불수요측량발전궤전자각급임하변량적미분,불의뢰우전력계통모개특정운행점,능괄응계통망락삼수여운행방식변화,교호지억제우동병실현궤단전압조절공능。방진결과험증료소득결론。
Most of the existing nonlinear excitation controllers of power systems are designed in state feedback approaches,so generator rotor angles and some variables＇ differentiations have to be measured.Besides that,these controllers drive relative rotor angles to reference values,thus they can＇t assure voltage regulation of generators during variation of the network parameters or the system operating point changes.This paper presented a novel output feedback based method for nonlinear excitation controller design.New model transformations were proposed for nonlinear models of single-machine-infinite-bus systems and multi-machine systems respectively.Both systems were transformed to uncertain linear ones where deviations of generator terminal voltage,rotor speed and generator active power output became state variables.And then the new controllers were designed by applying a robust control theory based on linear matrix inequality（LMI）.Rotor angles and any variable＇s differentiations don＇t need to be measured for the proposed controllers.The controllers don＇t rely on any pre-selected system operating point,and the controllers are adapt to variations of the system network parameters,and can well restrain disturbance and assure voltage regulations of generators.Simulation results verified the conclusions.