http://www.iust.ac.ir/files/ee/kalantar_921e9/ISI_Journals/ISI%20[25].pdf

Power management of PV/battery hybrid power source via passivity-based control

Backstepping control for an induction motor using an adaptive sliding rotor-flux observer

Energy reshaping based passive fractional-order PID control design and implementation of a grid-connected PV inverter for MPPT using grouped grey wolf optimizer

Power swings may cause power system instability; therefore, hybrid energy storage systems (HESSs) are necessary to smooth the output of wind farms. Superconducting magnetic energy storage (SMES) systems have a high power density, whereas battery energy storage systems (BESSs) provide a high energy density. The significant contribution of this paper is the proposal of hierarchical control strategies for an HESS composed of an SMES system and a BESS. Mathematical models and port-controlled Hamiltonian (PCH) models of the HESS are established. At the device level, a novel HESS control strategy based on the PCH models is proposed to improve its output performance. At the system level, a multilevel power allocation method based on empirical mode decomposition, Fuzzy control and advanced control is proposed to achieve an efficient grid connection for a wind farm; the grid connection considers the real-time and future state of charge of the SMES system and BESS. The effectiveness of the proposed strategies are verified through simulation studies.

Coordinated Control Strategies for SMES-Battery Hybrid Energy Storage Systems

This paper presents an application of interconnection and damping assignment passivity-based control (IDA-PBC) principle to the port-controlled phasor Hamiltonian (PCPH) model of solid-state transformer (SST) (comprising of three stages, namely, ac/dc rectifier, dual active bridge converter, and dc/ac inverter). A PCPH model of SST is established for each individual stages using dynamic phasor concept. In comparison with other PBC approaches, IDA-PBC offers an additional degree of freedom to solve the partial differential equations. According to the target of the controller design at each stage, the desired equilibrium point of the system is obtained. The closed-loop system performance achieves regulation of constant output dc-bus voltage and unity input power factor. Large-signal simulation results for the full system validate the simplifications introduced to obtain the controller and verify the proposed controller. Robustness of the controller is demonstrated with 20% load disturbance and 10% input disturbance. For validation of the proposed approach and its effectiveness, hardware-in-loop simulation is carried out using Opal-RT and dSPACE simulators.

Port-Controlled Phasor Hamiltonian Modeling and IDA-PBC Control of Solid-State Transformer

In order to improve the performance of three phase voltage source PWM rectifiers, this paper presents a passivity-based control (PBC) strategy based on port-controlled Hamiltonian with dissipation (PCHD) model established from the rectifierspsila power circuit. With the model, a passivity-based controller for PWM rectifiers is designed by using Inter-connection and Damping Assignment passivity-based control (IDA-PBC) method. This controller can stabilize the minimum of the systempsilas storage function at the desired equilibrium point determined by unity power factor and sinusoidal current on the AC side, and constant output voltage on the DC side. So the stable state performance and robustness against the loadpsilas disturbance of PWM rectifiers are both improved. The results of simulation show feasibility of this strategy.

Passivity-based control of three phase voltage source PWM rectifiers based on PCHD model

In order to improve the properties of three-phase boost-type PWM rectifiers, scholars in different countries have began to apply nonlinear control theory to study PWM rectifiers. For this purpose, this paper introduces the nonlinear control strategies of three-phase boost-type PWM rectifiers, which includes feedback linearization, passivity control based on Euler-Lagrange( EL) model, active disturbance rejection control (ADRC) strategy. Meanwhile this paper reviews nonlinear control strategies above and points to further research.

Nonlinear Control Strategies of Three-Phase Boost-Type PWM Rectifiers

The general methods to design induction motor torque and speed controller are analyzed based on passivity-based control (PBC) methods. In order to accelerate the response of system, a constant damping is injected into passivity-based controller, which will lead to the speed fluctuation in the period of arriving stable state currently. To overcome the disadvantage a new control strategy is presented in, where the flexible damping is added into the controller. Flexible damping can be achieved by using second order tracking differentiator (SOTD) to restrain the fluctuation. The strategy can make dynamic performance more optimum and torque and speed tracking effect better. The simulation results demonstrate the feasibility of this strategy.

Passivity-based control of induction motor based on euler-lagrange (EL) model with flexible damping

The mathematical model of Three-phase voltage sources Pulse Width Modulation (PWM) DC/AC inverter is nonlinear, in view of the traditional linear control strategy can not meet the requirements of designing high-performance inverter. What's more, when the loads will be not pure resistive load, the inverter further requires controller possess high-performance. This paper proposes a nonlinear control strategy for the inverter called Passivity-based Control. We can alter the inverter model in three-phase abc coordinate to two-phase synchronous rotating dq coordinate for establishing the Port Control Hamiltonian (PCHD) model for this system. We can control the distribution of energy in the system to achieve the control aim. Simulation results show that passivity-based control method can make this system possess the high-performance of robustness and dynamic.

Study on a nonlinear control strategy for three-phase voltage sources PWM DC/AC inverter based on PCH model

The output characteristics of photovoltaic (PV) cell is nonlinear, changing along with the change of external environment factors. In order to improve photovoltaic system's work efficiency, it's necessary to track the maximum power point. Considering single-stage three-phase photovoltaic grid-connected system as the research object, this paper analyzes the output characteristics of photovoltaic cell and operating principle of the system, and also designs passivity-based power controller. Meanwhile, the Incremental Conductance(INC) method based on power control is applied to the MPPT control, making the system response to the change of external environment quickly and accurately, so that the system is always working in the maximum power point. The Matlab/Simulink simulation results show that this method is feasible.

http://ieeexplore.ieee.org/iel5/6243571/6258911/06259003.pdf

Jiuhe Wang

Papers

Passivity-based control of three phase voltage source PWM rectifiers based on PCHD model

Nonlinear Control Strategies of Three-Phase Boost-Type PWM Rectifiers

Passivity-based control of induction motor based on euler-lagrange (EL) model with flexible damping

Study on a nonlinear control strategy for three-phase voltage sources PWM DC/AC inverter based on PCH model

The maximum power point tracking technology of passivity-based photovoltaic grid-connected system