星载角动量补偿系统的高/低权控制

High-authority/low-authority control for angular momentumcompensation system on satellite

摘要:

为了利用补偿飞轮来抑制卫星转动部件引入的角动量干扰问题,在分析补偿原理的基础上设计一个工程上易于实现的双闭环控制器．该控制器利用编码器角速度信号及其积分信号构成高/低权复合控制．指出现有补偿飞轮应用中的问题及改进措施,同时提出根据有效载荷运动特性和卫星姿态控制精度要求设计补偿飞轮参数的准则．仿真计算部分给出有效载荷各个运动模式下残余角动量的仿真曲线,结果表明所提出的补偿系统能补偿掉97％以上的干扰．本文的控制策略满足系统要求,提高了补偿系统响应速度、减小稳态误差．

Abstract:

For utilizing compensation-flywheel to suppress angular momentum disturbance of rotary part on satellite, the principle of compensation is analyzed, and based on this, a double closed loop controller is proposed to be easily realized in engineering application. It uses velocity and the velocity integral signal of encoder for high-authority control (HAC)/low-authority control (LAC). The problems in current applied compensation-flywheels and the corrective methods are presented. The guideline to determinate parameters of compensation-flywheel is introduced which is based on the motion characteristic of payload and requirement of satellite attitude control. In the section of simulation, result of residual angular momentum in every movement mode is demonstrated, and it reveals that the proposed system could compensate 97% disturbance. The control strategy has a satisfied performance to increase the response speed and reduce the steady-state error. 