Journal
IEEE TRANSACTIONS ON POWER ELECTRONICS
Volume 38, Issue 10, Pages 12394-12400Publisher
IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC
DOI: 10.1109/TPEL.2023.3299979
Keywords
Converter design; deep reinforcement learning (DRL); impedance-based stability analysis; power system stability
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This letter proposes a deep reinforcement learning-assisted framework for multiobjective optimization of control parameters and validates its effectiveness in a control hardware-in-the-loop converter system.
Impedance characteristics of power converters are dependent on operating conditions, posing challenges to the stability-oriented design of control systems. This is because constant control parameters, designed according to a limited number of operating conditions, may cause instability in other conditions. In this letter, a deep reinforcement learning-assisted framework is proposed to achieve multiobjective optimization of multiple control parameters. With a focus on converter stability under weak/strong grids, adaptive control parameters are generated for different power setting points, in alignment with requirements on dynamic performance. The effectiveness of the proposed framework is validated with the deployment and real-time operation of the well-trained actor (a shallowneutral network) in a control hardware-in-the-loop converter system. With adaptive control gains, system stability can be guaranteed without compromising dynamic response, despite the variation of internal power setting point or external grid strength.
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