CAJ | 학술논문

为了进一步改善传统线性最优励磁控制中的动态性能和调节精度,基于同步发电机的派克模型推导出了供设计线性最优励磁控制规律用的单机无穷大系统的线性化状态空间方程.以该方程为基础,设计了一种同时以机端电压、有功功率、无功功率、角速度、功角作为反馈量的线性最优励磁控制器,将发电机功角、无功功率这两个与稳定性和品质密切相关的重要参量引入控制规律.同时,为了提高机端电压的调节精度,基于稳态调整与动态调节区分开来的思想,将积分调节引入励磁控制规律.通过Matlab进行算例仿真,结果表明所设计的励磁控制规律与传统规律相比,能够有效地提高电力系统在大、小扰动下的稳定性,同时在电压调节精度方面亦有所改善.
위료진일보개선전통선성최우려자공제중적동태성능화조절정도,기우동보발전궤적파극모형추도출료공설계선성최우려자공제규률용적단궤무궁대계통적선성화상태공간방정.이해방정위기출,설계료일충동시이궤단전압、유공공솔、무공공솔、각속도、공각작위반궤량적선성최우려자공제기,장발전궤공각、무공공솔저량개여은정성화품질밀절상관적중요삼량인입공제규률.동시,위료제고궤단전압적조절정도,기우은태조정여동태조절구분개래적사상,장적분조절인입려자공제규률.통과Matlab진행산례방진,결과표명소설계적려자공제규률여전통규률상비,능구유효지제고전력계통재대、소우동하적은정성,동시재전압조절정도방면역유소개선.
This paper presents a linear state-space equation for a single machine-infinite system based on Park model, which is used for the design of optimal excitation control law. Applying this equation on the basis of optimal control theory, a new excitation controller is designed, in which the terminal voltage, active power, reactive power, angular velocity and angle are the feedback. Load angle and reactive power are introduced to excitation control law, which are closely related to stability and quality. At the same time, in order to improve the terminal voltage regulation accuracy, the integral control is introduced to the excitation control law. The result of MATLAB simulation indicates that compared with other methods, the proposed excitation control can effectively improve the power system’s stability in large and small disturbance, as well as voltage regulation precision.