Improved potential energy-shaping for port-controlled Hamiltonian systems

This paper investigates the asymptotical stabilization of port-controlled Hamiltonian （PCH） systems via the improved potential energy-shaping （IPES） method. First, a desired potential energy introduced by a transitive Hamiltonian function is added to the original kinetic energy to yield a desired Hamiltonian function. Second, an asymptotically stabilized controller is designed based on a new matching equation with the obtained Hamiltonian function. Finally, a numerical example is given to show the effectiveness of the proposed method.

A novel induction motor control scheme using IDA-PBC

A new control scheme for induction motors is proposed in the present paper, applying the interconnection and damping assignment-passivity based control （IDA-PBC） method. The scheme is based exclusively on passivity based control, without restricting the input frequency as it is done in field oriented control （FOC）. A port-controlled Hamiltonian （PCH） model of the induction motor is deduced to make the interconnection and damping of energy explicit on the scheme. The proposed controller is validated under computational simulations and experimental tests using an inverter prototype.

A global asymptotical stable control scheme for a Hexverter in fractional frequency transmission systems

A fractional frequency transmission system(FFTS)is the most competitive choice for long distance transmission of offshore wind power,while the Hexverter,as a newly proposed direct AC/AC converter,is an attractive choice for its power conversion.This paper proposes a novel control scheme characterizing the global stability and strong robustness of the Hexverter in FFTS applications,which are based on the interconnection and damping assignment passivity-based control(IDA-PBC)methodology.Firstly,the frequency decoupled model of the Hexverter is studied and then a port-controlled Hamiltonian(PCH)model is built.On this basis,the IDAPBC scheme of the Hexverter is designed.Considering the interference of system parameters and unmodeled dynamics,integrators are added to the IDA-PB controller to eliminate the steady-state error.In addition,the voltagebalancing control is applied in order to balance the capacitor DC voltages to obtain a better performance.Finally,the simulation results and experimental results are presented to verify the effectiveness and superiority of the IDA-PB controller.

Energy-based modeling and control for grid-side converter of doubly fed wind generator

To avoid dealing with the zero dynamics limitation brought by the bidirectional power flow through the back-to-back converter in a doubly fed wind generator, a new energy-based modeling and control approach for the grid- side converter is presented. During the modeling process, the grid-side converter is divided into two subsystems with the feedback interconnection structure, and the interactive matrix of the model takes into account the concrete port structure. Then, an energy-based controller is proposed to realize the grid-side control objectives based on the new model. Simulation studies are carried out in MATLAB/Simulink. Comparative results between the proportional-integral controller and the energy-based controller show that the latter one can obtain faster convergence rate and global stability as the load current varies. Moreover, the energy-based controller is also competent for grid-side control when simulated in a 2 MW wind energy conversion system with random wind.