Search Results for author: Yunjie Gu

Found 10 papers, 9 papers with code

Impedance-based Root-cause Analysis: Comparative Study of Impedance Models and Calculation of Eigenvalue Sensitivity

1 code implementation4 Apr 2022 Yue Zhu, Yunjie Gu, Yitong Li, Timothy C. Green

Impedance models of power systems are useful when state-space models of apparatus such as inverter-based resources (IBRs) have not been made available and instead only black-box impedance models are available.


Multi-Agent Reinforcement Learning for Active Voltage Control on Power Distribution Networks

1 code implementation NeurIPS 2021 Jianhong Wang, Wangkun Xu, Yunjie Gu, Wenbin Song, Tim C. Green

This paper presents a problem in power networks that creates an exciting and yet challenging real-world scenario for application of multi-agent reinforcement learning (MARL).

Multi-agent Reinforcement Learning reinforcement-learning

Dual Synchronous Generator: Inertial Current Source based Grid-Forming Solution for VSC

no code implementations5 Jul 2021 Huanhai Xin, Kehao Zhuang, Pengfei Hu, Yunjie Gu, Ping Ju

Based on dual synchronous idea, a dual synchronous generator (DSG) control is applied in VSC to form inertial current source.

SHAQ: Incorporating Shapley Value Theory into Multi-Agent Q-Learning

1 code implementation31 May 2021 Jianhong Wang, Yuan Zhang, Yunjie Gu, Tae-Kyun Kim

Value factorisation proves to be a useful technique for multi-agent reinforcement learning (MARL) in global reward game, but the underlying mechanism is not yet fully understood.

Fairness Q-Learning +2

Revisiting Grid-Forming and Grid-Following Inverters: A Duality Theory

1 code implementation27 May 2021 Yitong Li, Yunjie Gu, Timothy C. Green

Power electronic converters for integrating renewable energy resources into power systems can be divided into grid-forming and grid-following inverters.

Mapping of Dynamics between Mechanical and Electrical Ports in SG-IBR Composite Grids

1 code implementation13 May 2021 Yitong Li, Yunjie Gu, Timothy C. Green

The SG-dominated grid is traditionally analyzed in a mechanical-centric view which ignores fast electrical dynamics and focuses on the torque-speed dynamics.


The intrinsic communication in power systems: a new perspective to understand stability

1 code implementation30 Mar 2021 Yunjie Gu, Yitong Li, Timothy C. Green

The large-scale integration of converter-interfaced resources in electrical power systems raises new threats to stability which call for a new theoretic framework for modelling and analysis.

Participation Analysis in Impedance Models: The Grey-Box Approach for Power System Stability

1 code implementation8 Feb 2021 Yue Zhu, Yunjie Gu, Yitong Li, Timothy C. Green

This paper develops a grey-box approach to small-signal stability analysis of complex power systems that facilitates root-cause tracing without requiring disclosure of the full details of the internal control structure of apparatus connected to the system.

Modelling Hierarchical Structure between Dialogue Policy and Natural Language Generator with Option Framework for Task-oriented Dialogue System

1 code implementation ICLR 2021 Jianhong Wang, Yuan Zhang, Tae-Kyun Kim, Yunjie Gu

We test HDNO on MultiWoz 2. 0 and MultiWoz 2. 1, the datasets on multi-domain dialogues, in comparison with word-level E2E model trained with RL, LaRL and HDSA, showing improvements on the performance evaluated by automatic evaluation metrics and human evaluation.

Hierarchical Reinforcement Learning reinforcement-learning +1

Shapley Q-value: A Local Reward Approach to Solve Global Reward Games

2 code implementations11 Jul 2019 Jianhong Wang, Yuan Zhang, Tae-Kyun Kim, Yunjie Gu

To deal with this problem, we i) introduce a cooperative-game theoretical framework called extended convex game (ECG) that is a superset of global reward game, and ii) propose a local reward approach called Shapley Q-value.

Multi-agent Reinforcement Learning Policy Gradient Methods

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