针对静止无功发生器(static var generator,SVG)在无功补偿时存在直流侧电压不平衡和系统不稳定性等问题,在级联型H桥逆变器的基础上,建立了星型链式SVG的数学模型,构建了双闭环控制系统,其中电流内环采用PI解耦控制,电压外环采用分层控...针对静止无功发生器(static var generator,SVG)在无功补偿时存在直流侧电压不平衡和系统不稳定性等问题,在级联型H桥逆变器的基础上,建立了星型链式SVG的数学模型,构建了双闭环控制系统,其中电流内环采用PI解耦控制,电压外环采用分层控制,解决了直流侧电容电压的平衡问题,实现了系统的稳定工作。最后,在MATLAB/Simulink中构建了系统的仿真模型。仿真结果表明,所提出的控制方法具有较好的补偿效果和快速的动态性能。展开更多
Precise control of a magnetically suspended double-gimbal control moment gyroscope （MSDGCMG） is of vital importance and challenge to the attitude positioning of spacecraft owing to its multivariable, nonlinear and s...Precise control of a magnetically suspended double-gimbal control moment gyroscope （MSDGCMG） is of vital importance and challenge to the attitude positioning of spacecraft owing to its multivariable, nonlinear and strong coupled properties. This paper proposes a novel linearization and decoupling method based on differential geometry theory and combines it with the internal model controller （IMC） to guarantee the system robustness to the external disturbance and parameter uncertainty. Furthermore, by introducing the dynamic compensation for the inner-gimbal rate-servo system and the magnetically suspended rotor （MSR） system only, we can eliminate the influence of the unmodeled dynamics to the decoupling control accuracy as well as save costs and inhibit noises effectively. The simulation results verify the nice decoupling and robustness performance of the system using the proposed method.展开更多
文摘针对静止无功发生器(static var generator,SVG)在无功补偿时存在直流侧电压不平衡和系统不稳定性等问题,在级联型H桥逆变器的基础上,建立了星型链式SVG的数学模型,构建了双闭环控制系统,其中电流内环采用PI解耦控制,电压外环采用分层控制,解决了直流侧电容电压的平衡问题,实现了系统的稳定工作。最后,在MATLAB/Simulink中构建了系统的仿真模型。仿真结果表明,所提出的控制方法具有较好的补偿效果和快速的动态性能。
文摘Precise control of a magnetically suspended double-gimbal control moment gyroscope （MSDGCMG） is of vital importance and challenge to the attitude positioning of spacecraft owing to its multivariable, nonlinear and strong coupled properties. This paper proposes a novel linearization and decoupling method based on differential geometry theory and combines it with the internal model controller （IMC） to guarantee the system robustness to the external disturbance and parameter uncertainty. Furthermore, by introducing the dynamic compensation for the inner-gimbal rate-servo system and the magnetically suspended rotor （MSR） system only, we can eliminate the influence of the unmodeled dynamics to the decoupling control accuracy as well as save costs and inhibit noises effectively. The simulation results verify the nice decoupling and robustness performance of the system using the proposed method.
