This paper proposes a robust decentralized output feedback control scheme for a two-area interconnected power system. The control objective is to reduce frequency and tie-line power deviations due to load variations. The decentralized control problem is converted to scaled H-infinity control problem and an algorithm based on LMI is offered to obtain the decentralized controller. Further, parameter uncertainty is taken into account in the controller design to achieve robustness. Simulation results show the proposed method is effective.
This paper describes a simple-yet-effective control method for a DC-DC buck converter with voltage mode control (VMC), with a triangular wave generator (TWG) which regulates the slope of triangular wave based on the input and output voltages of the converter. Using the proposed TWG, both the load and line transient responses are improved. Since the TWG provides a line feed-forward control for the line transient response, it increases the open-loop bandwidth, and then better dynamic performance is obtained. Additional required circuit components are only a voltage controlled linear resistor (VCR) and a voltage controlled current source (VCCS). Compared with the conventional voltage control, the proposed method significantly improves the line and load transient responses. Furthermore this triangular wave slope regulation scheme is simple compared to digital feed-forward control scheme that requires non-linear calculation. Simulation results shows the effectiveness of the proposed method.
FPGAやASICなどのLSIの直近に配置される電源回路であるPOL(Point of Load)コンバータは，通常は非絶縁型の降圧DC/DCコンバータが用いられ，これらは電源ICとして集積回路化されている．このような電源ICの設計には，トランジスタ・レベルの集積回路設計から制御システムの上流設計まで幅広い知識が求められる．特に重要なのは制御システムの設計であり，これが最終的な電源性能を決定するが，この制御システムの設計は容易ではない．本講演では，非絶縁型の降圧DC/DCコンバータを題材とし，制御システムからのトップダウン設計を試みたのでこれを発表する．
The simple multi-period repetitive control system was proposed by Yamada et al. in order to specify the input-output characteristic and the disturbance attenuation characteristic more easily than the multi-period repetitive control system. In addition, Yamada et al. clarified the parameterization of all stabilizing simple multi-period repetitive controllers. Recently, Sakanushi et al. proposed the parameterization of all robust stabilizing simple multi-period repetitive controllers for multiple-input/multiple-output time-delay plants with uncertainty. However, using their method, it is complex to specify the low-pass filter in the internal model for the periodic reference input of which the role is to specify the input-output characteristic. Because, the low-pass filter is related to three free parameters in the parameterization. To specify the input-output characteristic easily, this paper proposes the parameterization of all robust stabilizing simple multi-period repetitive controllers for multiple-input/multiple-output time-delay plants with specified input-output characteristic such that the input-output characteristic can be specified beforehand.
The multi-period repetitive control system is a type of servomechanism for a periodic reference input. When multi-period repetitive control design methods are applied to real systems, the influence of uncertainties in the plant must be considered. In some cases, uncertainties in the plant make the multi-period repetitive control system unstable, even though the controller was designed to stabilize the nominal plant. The stability problem with uncertainty is known as the robust stability problem. Chen et al. proposed the parameterization of all robust stabilizing multi-period repetitive controllers for time-delay plants. However, their method cannot be applied to multiple-input/multiple-output time-delay plants. In this paper, we propose the parameterization of all robust stabilizing multi-period repetitive controllers for multiple-input/multiple-output time-delay plants.