Prediction control method for power electronic system finite set model based on discrete Lyapunov function

Abstract

The invention discloses a prediction control method for a power electronic system finite set model based on a discrete Lyapunov function, and belongs to the fields of power electronic converting technique and intelligent control. According to a discrete mathematic model of a converter, a discrete Lyapunov function base on an error term of a controlled quantity and a reference quantity is defined, a control law is obtained through a Lyapunov stability second theorem, an objective function based on the control law is established and through ergodic optimization, an optimal voltage vector is obtained. The method includes a feedback value of a controlled quantity, an error value compensation term of the controlled quantity and the reference quantity, and a feedforward compensation term of future reference input, so the system has a feedforward-feedback control structure. The method is simple in principle and easy in digital realization, and is characterized by good control performance and good robustness.

Description

technical field [0001] The invention relates to a single-phase voltage type PWM rectification technology, in particular to a finite set model predictive control method for a power electronic system based on a discrete Lyapunov function. Background technique [0002] With the development of the economy, the demand for high-power DC power supply is increasing year by year. The traditional uncontrolled and phase-controlled power supplies have large input current harmonics, low power factor has a great impact on the power grid, and the slow current response cannot meet the needs of production and life; and The voltage-type PWM rectifier can eliminate the harmonics of the input current from the source, and has a unit power factor, so it is the focus of attention in the field of power electronics. [0003] The traditional FCS-MPC has the advantages of simple principle and fast dynamic response, but there are also some shortcomings. For example, a higher sampling frequency is requi...

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Problems solved by technology

[0002] With the development of the economy, the demand for high-power DC power supply is increasing year by year. The traditional uncontrolled and phase-controlled power supplies have large input current harmonics, low power factor has a great impact on the power grid, and the slow current response cannot meet the needs of production and life; and The voltage-type PWM rectifier can eliminate the input current harmonics from the source, and has a unit power factor, so it is currently the focus of attention in the field of power electronics

[0003] The traditional FCS-MPC has the advantages of simple principle and fast dynamic response, but there are also some shortcomings. For example, a higher sampling frequency is required to achieve better control performance, which often requires larger filter components to meet the actual operation requirements. In addition, the traditional FCS-MPC has a large amount of calculation, which puts forward higher requirements for the microprocessor. The key is that the stability analysis of the traditional FCS-MPC is relatively difficult.

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