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arXiv 2204.08548math.OCcs.SYeess.SY
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部分可观测线性系的状态输出风险约束二次控制

State-Output Risk-Constrained Quadratic Control of Partially Observed Linear Systems

Nikolas Koumpis, Anastasios Tsiamis, Dionysios Kalogerias

摘要:

我们提出了一种方法来执行风险厌恶的二次调节的部分观测线性时不变(LTI)系统的过程和输出噪声干扰。为了补偿由于这两种类型的噪声引起的可变性,状态调节受到两个风险约束。后者使得所得到的控制器谨慎的随机干扰,通过限制统计变异性,即,一个简化版本的累积预期预测方差的状态和输出。我们提出的配方结果在一个最佳的风险规避政策,保留了良好的特性,经典的线性二次(LQ)控制。特别地,最优策略具有关于最小均方误差(mmse)估计的仿射结构。该策略的线性分量在风险较大的方向上更严格地调节状态,其中过程和输出噪声协方差、互协方差以及相应的惩罚同时较大。这是通过系统地“夸大”国家刑罚来实现的。附加的仿射项迫使状态对抗过程和输出扰动的纯三阶统计量和交叉三阶统计量顺序统计量。我们的最优策略的另一个有利的特点是,它可以预先离线计算,从而避免了以前的工作的限制。稳定性分析表明,无论参数整定如何,所得到的控制器始终是内稳定的。建议的风险规避政策的功能说明通过广泛的数值模拟通过一个工作的例子。

英文摘要:

We propose a methodology for performing risk-averse quadratic regulation of partially observed Linear Time-Invariant (LTI) systems disturbed by process and output noise. To compensate against the induced variability due to both types of noises, state regulation is subject to two risk constraints. The latter renders the resulting controller cautious of stochastic disturbances, by restricting the statistical variability, namely, a simplified version of the cumulative expected predictive variance of both the state and the output. Our proposed formulation results in an optimal risk-averse policy that preserves favorable characteristics of the classical Linear Quadratic (LQ) control. In particular, the optimal policy has an affine structure with respect to the minimum mean square error (mmse) estimates. The linear component of the policy regulates the state more strictly in riskier directions, where the process and output noise covariance, cross-covariance, and the corresponding penalties are simultaneously large. This is achieved by "inflating" the state penalty in a systematic way. The additional affine terms force the state against pure and cross third-order statistics of the process and output disturbances. Another favorable characteristic of our optimal policy is that it can be pre-computed off-line, thus, avoiding limitations of prior work. Stability analysis shows that the derived controller is always internally stable regardless of parameter tuning. The functionality of the proposed risk-averse policy is illustrated through a working example via extensive numerical simulations.

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