基于有限时间观测器的两级式储能变流器改进滑模自抗扰控制

doi:10.19595/j.cnki.1000-6753.tces.231469

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Abstract Under the traditional control strategy, the two-stage power conversion system (PCS) will produce a large overshoot and the response time from the jump to the steady-state operation is relatively long when the power jumps and the DC bus voltage fluctuates. At the same time, there is coupling effect between the active power and reactive power of the converter. To solve these transient problems, a sliding mode active disturbance rejection control strategy based on finite time convergence observer is designed in this paper.
The control strategy is applied to the power control of the rear DC-AC converter and the double-loop control of the DC-DC converter to improve the transient performance of the system. The basis of this control strategy is active disturbance rejection control (ADRC), which equates all uncertainties such as unknown disturbance and unmodeled part of the system to total disturbance, estimates the total disturbance by observer and compensates by feedforward channel, and then rapidly converges the feedback error to zero by sliding mode control. This control combines the advantages of ADRC independent of the precise mathematical model of the control object and fast convergence of the sliding mode control, which reduces the complexity of the controller and improves the transient response of the controller.
In order to facilitate the design of the controller during the design of the control strategy, the state equation of the two-stage power conversion system in the abc coordinate system is converted to the state equation in the dq coordinate system. According to the mathematical model of the dq coordinate system, it can be seen that there are coupling effects between the dq axis variables after the converter's coordinate transformation. In order to suppress the coupling phenomenon, the coupling part of the converter state equation is classified into total disturbance, and the equivalent total disturbance is estimated quickly and accurately by designing a finite time convergence observer, and the disturbance estimate is improved by feedforward compensation. Secondly, the linear feedback link in ADRC is replaced by a nonlinear sliding mode control with faster response and insensitive to parameters, which improves the error convergence speed and the disturbance immunity performance of the controller. In sliding mode feedback control, the integral sliding mode is used to reduce the steady-state error in the control process, and the sliding mode reaching law is composed of exponential reaching law and power reaching law, which ensures the fast reaching ability when the control orbit is far from the equilibrium point, and also has the ability to reduce chattering when the control orbit is near the equilibrium point. At the same time, in order to provide stable bus voltage on DC side, the proposed control is applied to double loop control of DC side voltage and current according to the state equation of DC-DC converter to improve the transient stability of DC bus voltage fluctuation. Then the stability and finite-time convergence of the proposed control strategy are proved according to Lyapunov stability theory, and the convergence time of the sliding mode feedback control law is calculated.
Finally, the circuit model of the two-stage power conversion system is built in Matlab/Simulink simulation software and hardware in the loop (HIL) experiment, and the proposed control is applied to carry out simulation and experimental verification, and the control is compared with PI control and unimproved ADRC. The transient performance of three different control strategies in terms of power change, coupling effect, harmonic content and DC bus voltage fluctuation is compared. The simulation and experimental results show that compared with the other two control methods, the proposed control can significantly suppress the coupling effect, reduce the harmonic content of grid-connected current, and improve the transient performance when the power changes and the DC bus voltage fluctuates.

Key words： Two-stage power conversion system finite-time observer active disturbance rejection control integral sliding mode StarSim

Received: 06 September 2023

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TM46

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	Huang Hongjie
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	Zhou Jie

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Huang Hongjie,Huang Jinfeng,Zhou Jie. Improved Sliding Mode Active Disturbance Rejection Control for Two-Stage Power Conversion System Based on Finite Time Observer[J]. Transactions of China Electrotechnical Society, 2025, 40(1): 178-189.

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https://dgjsxb.ces-transaction.com/EN/10.19595/j.cnki.1000-6753.tces.231469 OR https://dgjsxb.ces-transaction.com/EN/Y2025/V40/I1/178

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