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In this paper, we propose a policy gradient reinforcement learning method which directly estimates the gradient of the state value function (V-function) with respect to a feedback coefficient matrix using measurable data and uses it for policy improvement. The proposed method can be applicable to the case where the state-action value function (Q-function) is difficult to estimate, and can update the...
For a discrete-time linear time-invariant partially observable system that satisfies the well-known algebraic condition of observability, we derive a fully observable system equation using an augmented state vector combining output and input sequences. The derived representation enables application of reinforcement learning methods for fully observable linear quadratic regulation problems to partially...
We discuss a model predictive, hierarchical control for energy network systems including batteries. We propose a three-layered, state-dependent virtual hierarchical structure for the batteries in a system and an algorithm for controlling batteries to realize a glocal control in the field of energy network with energy storage devices. Computational experiments are contained to show the effectiveness...
This paper reports an attempt to generate production-ready embedded software for a digital controller of two phase double-ended forward converter designed as a part of server power supply. We developed an automatic code generation environment based on MATLAB/Simulink, and made a controller model which realizes an appropriate execution management. Newly developed custom block enabled it. Furthermore,...
In this paper, we report the first rapid control prototyping (RCP) system with a sub-nanosecond (ns) high-resolution Pulse Width Modulation (PWM) for server power supply circuits. Conventional RCP systems are designed mainly for engine and motor control. Based on the relevant response time and control accuracy requirements, their PWM update periods and resolutions are over 100 microseconds (µs) and...
The purpose of this study is to improve the efficiency of a boost-type power factor correction (PFC) circuit with a digital controller. One of the biggest losses in PFC circuits is the switching loss. Switching loss can be reduced by low boost ratio operation, but these results in a greater voltage drop at transient response. The voltage drop can be suppressed by using a high gain setting for the...
Tow phase double-ended forward converter is suitable for more than 2kW high efficiency power supply by the feature of low surge voltage. One issue of the converter is dead-time loss of synchronous rectifier FETs. In this paper, we propose a precise digital dead-time control method for a 2.5 kW (12 V / 208 A) output power supply. Proposed method is confirmed by experiment and theoretical analysis that...
We investigate controlled quantum systems under continuous quantum measurement utilizing the theory and techniques of differential geometric analysis for dynamical systems with affine state space. At first, by employing the notion of the strong accessibility distribution, we analyze the local state transition in detail and show that it is quite limited under conditions on the setting of measurement...
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