Large-Signal Stable Nonlinear Control of DC/DC Power Converter With Online Estimation of Uncertainties

Abstract

The Passivity-Based Control (PBC) is recognized as an effective energy shaping approach to guarantee the asymptotic stability of the whole system by using the passivity property. However, the model-based and sensor-based characteristics limit its development and application. The combination of the PBC and online estimation technique can solve these problems. The purpose of this paper is to propose a controller and an observer, which are designed simultaneously based on Hamiltonian framework and Lyapunov criterion. It leads to the system design without separation of the dynamics of the controller and the observer. The uncertainties in the model and parameters are considered as equivalent voltage and current sources. To reduce the number of sensors, input voltage, output current, and equivalent sources are estimated together. The steady-state error is eliminated by using this estimation technique. The exponential stability of the whole system (converter, controller, and observer) is proved by using a proper Lyapunov function. Simulation and experimental results from a 3 kW 270−350 V DC/DC boost converter with a Constant Power Load (CPL) are performed to confirm the proposed control algorithm. Since the system parameter values may vary with temperature and the equilibrium point, the robustness of the proposed method is verified without and with parameters uncertainties.Index Terms-Large-signal stability, Interconnection and damping assignment passivity-based control (IDA-PBC), portcontrolled Hamiltonian (PCH), microgrid, DC/DC converter, constant power load (CPL), online estimation.

Review of Modern Control Technologies for Voltage Regulation in DC/DC Converters of DC Microgrids

“…In this way, the unknown parameter of the nominal converter model becomes available online and used in the design of the IDA-PBC law. A non-linear state and disturbance observer is integrated in the IDA-PBC structure of a boost DC/DC converter in [49]: the observer estimates the total disturbance, i.e., internal and external disturbances, and this estimation is included in the derivation of the state feedback IDA-PBC law. In this way, the controller becomes robust against disturbances.…”

Large-Signal Stabilization of Power Converters Cascaded Input Filter Using Adaptive Energy Shaping Control

“…However, a certain set of values will only be satisfied with a given power range. This shortcoming has to be overcome using an on-line parameter observer such as [27] in the future work. It is out of the scope of this paper.…”

“…The large-signal stability of the whole system can be guaranteed by using the passivity property when several stable and passive ensured subsystems are integrated into the microgrid [25]. PBC has been widely used in many physical systems including power electronics converters, such as dc-dc converter [26], [27], [28], ac-ac converter [29], three-phase inverter [30], and solidstate transformer [31]. These controllers are based on Euler-Lagrange (EL) models or port-controlled Hamiltonian (PCH) models, which provide the generalized integrated structures for PBC.…”

Adaptive Hamiltonian-Based Energy Control with Built-In Integrator for PEMFC Hybrid Power Conversion Architecture

“…Because of the increasing impact of fossil-fuel combustion on environmental pollution, renewable energy sources have been increasingly valued by industry and academia and have started to gradually replace traditional energy sources. Meanwhile, transportation, as the main source of energy use, is gradually shifting from fossil-fuel energy supply to electric and hybrid forms [1,2]. Among them, Proton-Exchange Membrane Fuel Cells (PEMFCs) are receiving more attention because of their zero emissions and high efficiency [3,4].…”