Energy optimal attitude control for a solar-powered spacecraft

Kristiansen, Bjørn Andreas; Gravdahl, Jan Tommy; Johansen, Tor Arne

doi:10.1016/j.ejcon.2021.06.021

Cited by 14 publications

(22 citation statements)

References 16 publications

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“…The functions f (•) and g(•) are designed to steer ω b ob and q o b , respectively, to their desired final states. More specifically, [20].…”

Section: B Maximum Hands-off Controllermentioning

confidence: 99%

“…The NLP-solver IPOPT was used to solve the optimization problems, using the solver's default options. The optimal control problems in (17), (19) and (20) were discretized using direct multiple-shooting, whereas the dynamics of the spacecraft were discretized using Runge-Kutta 4 integration. The output from the PD controller was used as the initial guesses for the L 1 -optimal controller, and the output from the L 1 -optimal controller was given as initial guesses for the maximum hands-off controller and the moving maximum hands-off controller.…”

Section: Simulation Setupmentioning

confidence: 99%

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Maximum Hands-Off Attitude Control

Schaanning

Kristiansen

Gravdahl

2022

2022 American Control Conference (ACC)

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In this paper, we explore the use of maximum hands-off control for attitude control of a spacecraft actuated by reaction wheels. The maximum hands-off, or L0-optimal, controller aims to find the sparsest control signal among all admissible control signals. L0-optimal problems are generally hard to solve as L0-cost functions are discontinuous and nonconvex. Previous research have investigated methods to approximate the L0-norm in the cost function, for instance by using an L1-norm. We propose an approach to the maximum hands-off control problem for spacecraft attitude control involving an L0cost function relaxed through complementarity constraints. The controller is applied to the spacecraft attitude control problem, and the performance of the maximum hands-off controller is compared to that of the L1-optimal controller. Simulations of a 6U CubeSat were conducted using CasADi as the primary optimization tool, and the L1-and L0-optimal control problems were discretized using direct multiple-shooting and solved using the IPOPT solver. In addition to these results, we propose a new control scheme, called moving maximum hands-off control, which lets the user specify in which time interval the control should occur, and then aims to find the sparsest control among all admissible controls based on this information. The moving maximum hands-off controller is demonstrated to be as sparse as the maximum hands-off controller for some spacecraft maneuvers.

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“…The functions f (•) and g(•) are designed to steer ω b ob and q o b , respectively, to their desired final states. More specifically, [20].…”

Section: B Maximum Hands-off Controllermentioning

confidence: 99%

Section: Simulation Setupmentioning

confidence: 99%

Maximum Hands-Off Attitude Control

Schaanning

Kristiansen

Gravdahl

2022

2022 American Control Conference (ACC)

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“…An example can be found in reference [7] which develops a technique to prevent sudden uncontrolled maneuvers while keeping the nadir pointing direction. Other authors such as Kristiansen and Gravdahl [8] have focused on the net power gain of solar panels. In their work, they propose a balance between the power generated by the panels and the additional energy consumption by the attitude control subsystem required to maintain the optimal Sun-tracking attitude.…”

Section: Introductionmentioning

confidence: 99%

Derivation of a Sun-tracking law for payloads with pointing restrictions in the UPMSat-3 mission

Porras-Hermoso,

Marín-Coca,

González-Monge

et al. 2024

J. Phys.: Conf. Ser.

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Satellites dedicated to remote sensing either for the Earth or space, typically require their instruments to be pointing toward the location of their object of study. These satellites can face significant challenges as different components also have its own pointing requirements to be operative or work optimally. For instance, we have the case of solar panels for electrical power generation, where perfect pointing of the panels toward the Sun can affect negatively to payload operation. Common solutions for maximizing power generation include the usage of orientable solar panels. However, this approach increases the complexity of the satellite, raising the cost of the solar panels and their associated mechanism. In this study, we propose a new approach that enables high-consuming remote sensing payloads to operate for extended periods without using orientable solar panels. To ensure maximum power generation without compromising the satellite’s pointing constraints, an optimal tracking law is derived. This law maximizes the projected solar array area at each instant, resulting in maximum electrical power generation. The proposed method is validated against an actual mission scenario. This work offers significant benefits for satellite operators, reducing the need for costly orientable solar panels and enhancing the overall efficiency of satellite missions.

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“…In [16], a switch geometrical method control scheme is derived for energy-optimal reorientation under input saturation. Addressing the power limitation of CubeSat, a constrained optimal attitude control problem can be solved aiding by the IPOPT solver [17]. It can be noted that the above-considered constraints are static, and numerical optimization algorithms are still awkward to cope with them while satisfying real-time computation, not to mention the guarantee of prescribed performance (a dynamical system behavioral bound).…”

Section: Introductionmentioning

confidence: 99%

Optimized Data-Driven Prescribed Performance Attitude Control for Actuator Saturated Spacecraft

Yang

Dong

et al. 2023

IEEE/ASME Trans. Mechatron.

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This article addresses the crucial requirements in spacecraft attitude control: prescribed performance guarantees under actuator saturation and real-time cost optimization. As an application-oriented study, an approximate optimal prescribed performance attitude control scheme is proposed for this objective. To be specific, the prescribed performance constraint is converted into the system dynamics and merged into the adaptive dynamic programming design philosophy. Subsequently, the online learning law is designed based on a special saturated HJB error, in which a dynamical scale is introduced to adjust the learning gain by measured data. It enhances learning efficiency and applicability. Then, uniformly ultimately bounded stability of the whole system is achieved with guaranteed convergence of optimization by the Lyapunov-based stability analysis. Finally, both numerical simulation and hardware-in-the-loop experiments demonstrate the superiority and effectiveness of the proposed method. These attributes and outcomes attained will promote the development of practical space missions.

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Energy optimal attitude control for a solar-powered spacecraft

Cited by 14 publications

References 16 publications

Maximum Hands-Off Attitude Control

Maximum Hands-Off Attitude Control

Derivation of a Sun-tracking law for payloads with pointing restrictions in the UPMSat-3 mission

Optimized Data-Driven Prescribed Performance Attitude Control for Actuator Saturated Spacecraft

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