Proportional control

About: Proportional control is a research topic. Over the lifetime, 3756 publications have been published within this topic receiving 49050 citations.

Novel Expressions of Equations of Relative Motion and Control in Keplerian Orbits

Abstract: : In this Note, the relative motion between two spacecraft is studied with emphasis on physical insights. The full equations of relative motion in Keplerian orbits are converted into the general form of a second-order differential equation, and then feedback control laws are proposed for different control objectives. Besides the control laws presented in this Note, other various control design methods, which have already been developed for other applications (such as robot manipulator or spacecraft control), can also be easily applied for the relative motion control, thanks to the use of the generic form.

Coaxial two-wheeled vehicle

Abstract: PROBLEM TO BE SOLVED: To provide a coaxial two-wheeled vehicle which is stable against fluctuation of load weight and stably provides both attitude control and travel control. SOLUTION: An attitude controller 84 calculates a motor torque Tgyr for keeping a base at a target angle based on the deviation between a base angle instruction θref which is an attitude instruction and a current base angle θ 0 that is calculated using a gyro-sensor 13 and an acceleration sensor 14. Meanwhile, a position proportional controller 86R, a differentiator 88R, and a speed proportional controller 89R perform PD control for the deviation between the rotational position instruction Prefr of a motor rotor 92R for a right wheel and the current rotational position θr of the motor roller 92R. A current control amplifier 91R generates a motor current based on the value of a motor torque which is a control result added with an estimated load torque T 1 ' calculated using the motor torque Tgyr and a pressure sensor for driving the motor rotor 92R. COPYRIGHT: (C)2005,JPO&NCIPI

Robust positioning control of pneumatic servo system with pressure control loop

Abstract: The goal of this paper is to attain a robust positioning control of a pneumatic driving system. A positioning control system positively focusing on the pressure control is investigated from the view that the pressure control is indispensable for improvement of control performances. A disturbance observer is employed to improve the pressure response and compensate the influence of friction force and parameter change. Consequently the improvements of robustness against payload and of positioning accuracy have been attained.

Fault-Tolerant Control of Multiarea Power Systems via a Sliding-Mode Observer Technique

Abstract: This paper is focused on solving the problems of fault estimation and fault-tolerant control for multiarea power systems with sensor failures. First, the estimations of the system states and fault vectors are determined using an improved sliding-mode observer technique. Moreover, a derivative gain and a proportional gain are introduced to design the resultant sliding-mode observer more freely, and a discontinuous input is given to reduce the impact of sensor faults and aggregated uncertainties. Then, based on the obtained state estimates, an integral-type sliding-mode control scheme against faults and disturbances is proposed to ensure that the resultant fault system is asymptotically stable, from which each subsystem states in the multiarea power system can be driven onto the designed sliding-mode surfaces in both the state estimation and error estimation spaces. Finally, a three-area power system is simulated to validate the feasibility of the developed fault-tolerant control scheme.

Stability Design of Single-Loop Voltage Control With Enhanced Dynamic for Voltage-Source Converters With a Low LC -Resonant-Frequency

Abstract: Voltage-controlled voltage-source converters (VSCs) are widely applied in islanded microgrids, dynamic voltage restorers, and uninterruptible power supplies, etc. Typically, an LC filter with a large filter capacitance is employed to improve the quality of output voltage and system robustness against external disturbances. Nevertheless, a large capacitance may lead to a low LC -resonant-frequency and cause unstable voltage control of VSCs when a single-loop proportional-resonant (PR) or resonant controller is used. This paper proposes a novel design of single-loop voltage control, where a negative proportional gain is adopted in the PR voltage controller, and it is revealed that the voltage control can be stable even with a low LC -resonant-frequency, e.g., lower than one-third of the system sampling frequency. To tackle the poor dynamic issue introduced by the negative proportional gain, this paper further proposes a closed-loop zeros configuration-based control method, which can flexibly tune the system dynamic response without affecting its stability. Finally, simulation and experimental results are provided to verify the effectiveness of the proposed method.