Control and Accuracy Assessment for the Space Station Sun Directional Unit Test System

2019 13th International Conference on Sensing Technology (ICST) Pub Date : 2019-12-01 DOI:10.1109/ICST46873.2019.9047687

Xinlin Bai, QiuShi Li, Xiao Zhang, Z. Zhao, Mingyang Liu, Yun He

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Abstract

To check driving performance of the sun directional device, a semi-physical test system is set up on the ground based on electric load simulator. The problems, such as the big torque, high precision and high frequency noise which the control of the test system is confronted, caused by the characteristics of the flexibility and the large inertia of the solar arrays has been solved. In this paper, the mechanism model of electric load simulator is established, and the parameters of the loading unit are identified by the least square method, then the significance of each parameter to the response characteristic of loading unit is analyzed. Then, the controller of the loading unit is designed based on the compound control algorithm, including differential negative feedback, lead compensation and fuzzy adaptive PID, which effectively broadens the bandwidth of the loading unit and improves the dynamic performance. At last, step signal, sinusoidal signal and other signals are used to check the response speed, loading bandwidth and loading accuracy of the test system. The feasibility and effect of the compound control algorithm method are also proved by experiments.

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空间站太阳定向单元测试系统控制与精度评估

为了检验太阳定向装置的驱动性能，在地面搭建了基于电动负载模拟器的半物理测试系统。解决了太阳能电池阵的柔性和大惯性特性给测试系统控制带来的大扭矩、高精度和高频噪声等问题。建立了电动负载模拟器的机理模型，采用最小二乘法对加载单元参数进行辨识，分析了各参数对加载单元响应特性的影响。然后，基于微分负反馈、超前补偿和模糊自适应PID的复合控制算法设计了加载单元的控制器，有效地拓宽了加载单元的带宽，提高了动态性能。最后利用阶跃信号、正弦信号等信号对测试系统的响应速度、加载带宽和加载精度进行了检验。通过实验验证了该复合控制算法的可行性和效果。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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2019 13th International Conference on Sensing Technology (ICST)

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