Abstract
In traditional model predictive control (MPC) methods, the power prediction of the state quantity is not only limited by the measurement of the voltage sensor, but also the open-loop control. In order to boost the overall prediction accuracy without AC voltage sensor, an improved sliding mode estimation-model predictive power precision control strategy without AC voltage sensor was proposed. In this paper, the voltage on the network side is dynamically estimated by using sliding mode sigmoid function, and the system stability is proved by the Lyapunov function. On this basis, the active power and reactive power at time k+2 are calculated through the designed rolling optimization prediction link with feedback correction, aiming to reduce power pulse vibration and accurate prediction. The simulation and experimental results show that the proposed control strategy effectively suppresses the influence of grid-side harmonics on the prediction accuracy and improves the overall of the dynamic and static performance of the system.
Highlights
Owing to the considerable advantages of bidirectional energy flow and adjustable power factor [3], three-phase voltagetype pulse width modulation (PWM) rectifiers have been applied to numerous fields, such as the industrial transmission of microgrids, wind energy generation systems, active filtering etc. [1], [2]
XIAO et al: Improved Precise Power Control of Voltage Sensorless-Model predictive control (MPC) for PWM Rectifiers angle compensation method are used to avoid the delay of action caused by extensive calculations
According to the above analysis, this paper introduces a sliding mode voltage estimation method based on the model predictive power control, proposing a sliding mode estimation-model prediction power precision control without voltage sensors
Summary
Owing to the considerable advantages of bidirectional energy flow and adjustable power factor [3], three-phase voltagetype pulse width modulation (PWM) rectifiers have been applied to numerous fields, such as the industrial transmission of microgrids, wind energy generation systems, active filtering etc. [1], [2]. X. XIAO et al Improved Precise Power Control of Voltage Sensorless-MPC for PWM Rectifiers angle compensation method are used to avoid the delay of action caused by extensive calculations. Researches [25] and [26] combined the sliding mode observer with MPC, but the switch function sign used by the observer is prone to highfrequency oscillations These MPC algorithms are established based on open-loop prediction, which indicates that the accuracy of power prediction needs to be improved.
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