Passivity-Based Control With Active Disturbance Rejection Control of Vienna Rectifier Under Unbalanced Grid Conditions

Abstract

In this paper, a practical passivity-based control (PBC) with active disturbance rejection control (ADRC) is proposed to improve performance of the Vienna rectifier under unbalanced grid conditions. In general, the traditional double-loop control based on positive and negative sequence transformation is used in Vienna rectifier under unbalanced grid conditions. However, it could not fundamentally solve the additional time delay caused by the second harmonic filter and loss of performance caused by a linear weighted sum of proportional integral (PI) controller. What's more, the complexity of the controller is high for the positive and negative sequence currents need to be controlled separately. The PBC is a nonlinear controller based on energy dissipation and it has strong robustness to interference. Further, the line voltage based PBC in inner current loop can deal with the voltage unbalance effectively and easily without negative sequence transformation. To improve the disturbance rejection ability, the ADRC is applied in outer voltage loop, which could overcome PI's drawbacks of step overshoot and slow response. Under unbalanced grid conditions, the proposed control strategy has good performance, easy implementation and less consuming time with PBC control in inner current loop, and it has strong robustness and fast track performance with ADRC control in outer voltage loop. The detailed mathematical model, control principle and controller design of the Vienna rectifier are thoroughly analyzed. In addition, simulation results based on SIMULINK are also given in the paper. Finally, a downsize 5kW Vienna rectifier prototype is built to validate the correctness and effectiveness of the proposed strategy. INDEX TERMS Active disturbance rejection control, passivity-based control, unbalanced grid condition, Vienna rectifier.

Mode Predictive Direct Power Control Scheme with Fixed Operation Frequency for a Vienna Rectifier Based on Voltage‐Sensorless

“…Another key issue for MPC control suffers from the drawback that the switching frequency is not fixed, resulting in large current ripple caused by discontinuous switching [19][20][21][22][23][24][25][26]. To address this issue, several MPC algorithms with fixed switching frequency have been proposed.…”

Model predictive direct power control scheme for Vienna rectifier with constant switching frequency

“…The operation process is as follows: Firstly, the vector region is divided into 6 large sectors according to the input voltage, and the cost function values under 8 different switching sequences are calculated in each large sector, three cost functions are obtained when the cost function is minimum. According to Equation (11), the pulse time of three switch sequences is calculated and the switch pulse signal is formed. The above process is repeated in every cycle to realize on-line solution.…”

“…With the development of research on Vienna rectifier, many control methods are extended from conventional linear control to non-linear control method, such as sliding mode control (SMC) [6,7], model predictive control (MPC) [4,[8][9][10], passivity-based control [11,12] and so on. SMC and passivitybased control have the advantages of strong anti-interference ability and fast dynamic response, but SMC needs to design sliding mode surface and controller, and passivity-based control needs to design energy function and control law.…”

An Improved Three-Level Cascaded Control for LCL-Filtered Grid-Connected Inverter in Complex Grid Impedance Condition

“…A linearized model for threephase LCL-filtered grid-connected VSI with PWM-SMC control is proposed in [21] and a three loop step-by-step design method of the controller is also developed. The PBC method has clear physical meaning since the fundamentals of mathematics are based on Euler-Lagrange (EL) model to shape energy and inject damping [22]- [24]. In [25], a stepby-step parameters design method is proposed to select the damping gains of PBC controller from inside to outside to limit the steady-state error of grid-injected current for gridconnected inverter.…”