A Hybrid Distribution Transformer with H∞ Closed Loop Controller
Gao Yachen1,2, Liang Deliang1,2, Li Dawei1,2, Zhou Kun1,2, Liu Yibin1,2
1. State Key Laboratory of Electrical Insulation and Power Equipment Xi’an Jiaotong University Xi’an 710049 China; 2. Shaanxi Key Laboratory of Smart Grid Xi’an Jiaotong University Xi’an 710049 China
Abstract:Aiming at improving the ability of hybrid distribution transformer (HDT), and solving voltage sags/swells and frequency variations that exist in power distribution system, this paper built the mathematical model of HDT in dq0 coordinates and a controller mathematical model based on Kalman filter and multi-variable regulation H∞ closed loop theory, then formulated its transfer function. Then a new HDT topology based on H∞ FF/FB controller was established and its mechanism was analyzed. Proposed type of HDT enables not only compensate voltage when sags/swell happens in power system, but also helps realize zero steady-error, better robustness and frequency variations of load side, which makes HDT could give better performance on the improvement of power quality. Finally the effectiveness of the proposed controller was verified on Matlab/Simulink platform.
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