Nonliear-disturbance-observer based DC-bus voltage control for DC microgrid
- Resource Type
- Conference
- Authors
- Hong, Zhu; Yu, Dongsheng; Chen, Hao; Cheng, He; Zan, Xiaoshu
- Source
- 2016 14th International Conference on Control, Automation, Robotics and Vision (ICARCV) Control, Automation, Robotics and Vision (ICARCV), 2016 14th International Conference on. :1-5 Nov, 2016
- Subject
- Computing and Processing
Robotics and Control Systems
Signal Processing and Analysis
Conferences
Automation
Robots
DC-bus voltage
nonlinear disturbance observer
nonlinear observer gain
composite control law
feed-forward control
- Language
In order to improve the DC-bus voltage control performance and suppress the transient fluctuation of DC-bus voltage, a nonlinear disturbance observer (NDO) based DC-bus controller is proposed in this paper. The feed-forward compensation of active power disturbance is achieved by the proposed controller to reject the influence of parameter variations and the mismatched disturbance from the output terminals. The active power disturbance of feed-forward compensation can be effectively estimated by the NDO without requirement of measuring the load and sources power, which will reduce the hardware cost and also increase the reliabilities of DC microgird. The feed-forward compensation gain is designed by taking convergence rate of the observer and the influence of compensation gain on the stability of DC microgrid into account. Simulations are carried out to verify the performance of the proposed control method in consideration of different disturbances.