New Double Closed Loop Linear Active Disturbance Rejection Control of Energy Storage Grid-Connected Inverter Based on Lead-Lag Correction Link

Abstract

The energy storage grid-connected inverter system is a complex system with strong nonlinearity and strong coupling, which quality and efficiency of grid-connection are affected by factors such as grid voltage fluctuations and model uncertainty. Based on the analysis of the working principle of the grid-connected energy storage system, this paper aims to improve the performance of the traditional linear active disturbance rejection control (LADRC) technology, in order to overcome the problems of serious phase lag of linear extended state observer (LESO) and poor ability to suppress high-frequency noise on the basis of introducing the proportional differential link in the traditional LESO, the differential term of output voltage error is introduced in LESO. In addition, the output of the channel for total disturbance is corrected to improve the disturbance observation ability of LESO against high-frequency noise. The theoretical proof of LADRC and the comparative analysis of Bode plots show that the improved LADRC has better anti-interference performance. Finally, to verify the effectiveness of the control strategy designed in this paper, different types of low-voltage ride-through faults are designed on the grid-side. The simulation results show that the new controller can improve the control performance effectively of the energy storage grid-connected system.

Anti-Disturbance Compensation-Based Nonlinear Control for a Class of MIMO Uncertain Nonlinear Systems

“…Several engineering control application tasks have been effectively fixed in the last two decades, via the effective implementation of ADRC. These include flexible-joint manipulator control [33], omnidirectional mobile robot control [34], aerospace [35], temperature control [36], DC-DC power converters [37], speed control of permanent magnet DC motor [38], control of power output of wind turbines [39], Energy Storage Grid-Connected Inverter [40], Lower Limb Exoskeleton in Swing Phase [41], Ship Dynamic Positioning Systems [42], Vibration Suppression in Position Servo Systems [43], speed control of Differential drive mobile robot [44], Hydraulic Valve-Controlled Hydraulic Motor [45], the applications of ADRC on unmanned aerial vehicles are highlighted in [46][47][48][49].…”

Nonlinear Adaptive Disturbance Rejection Control Strategy Based on VSG for Photovoltaic-Storage Grid-Connected Inverter

“…The state quantities in the mathematical model of three-phase grid-connected VSG are all AC quantities, and there is a strong coupling between variables, so VACDCL is commonly used to decouple them [25]- [26]. However, when VACDCL is used as the underlying control strategy, the controller actually indirectly modulates the feedback signal and cannot adjust the given AC voltage and current signal without static difference [28], [29]. Because the PI parameters in VACDCL are mostly selected by empirical method [34], the PI parameters optimized by intelligent algorithm also have the problem of complicated calculation [35].…”

Improved Controller and Design Method for Grid-Connected Three-Phase Differential SEPIC Inverter

“…Though the overall efficiency of the inverter has been improved, two control loops are essential to regulate DC-link voltage and to control the injected current to the grid. Furthermore, smooth operation of DC-link voltage requires the utilization of large electrolyte capacitors, which adversely affect the inverter reliability and operating lifetime [8]- [10].…”