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Fixed frequency model prediction control method for voltage type PWM (Pulse Width Modulation) rectifier in process of voltage unbalance drop

A technology of model predictive control and voltage unbalance, applied in the direction of reducing/preventing power oscillation, etc., can solve the problems of not being able to suppress the fluctuation of active power and reactive power of the system at the same time, complex control structure, large amount of calculation, etc., to eliminate the influence, Enhanced operational performance and suppressed fluctuations

Inactive Publication Date: 2013-02-27
HENAN NORMAL UNIV
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Problems solved by technology

In addition, the control structure of this method is complex, the amount of calculation is large, and the fluctuation of active power and reactive power of the system cannot be suppressed at the same time.

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  • Fixed frequency model prediction control method for voltage type PWM (Pulse Width Modulation) rectifier in process of voltage unbalance drop
  • Fixed frequency model prediction control method for voltage type PWM (Pulse Width Modulation) rectifier in process of voltage unbalance drop
  • Fixed frequency model prediction control method for voltage type PWM (Pulse Width Modulation) rectifier in process of voltage unbalance drop

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[0014] The present invention will be further described below in conjunction with the accompanying drawings. figure 1 middle, u ga , u gb , u gc is a three-phase voltage source on the AC side, i ga , i gb , i gc is the three-phase AC side current, u ca , u cb , u cc is the three-phase voltage at the input side of the power bridge, u dc is the DC side voltage, L g and R g are the incoming inductance and its equivalent resistance, respectively, C is the DC filter capacitor, O is the midpoint of the grid, i L is the load current, the DC side load is determined by the resistor R L equivalent representation. Define a unipolar binary logic switch function S k ， when S k =1( k = a, b, c) for the converter k The upper bridge arm of the phase is opened, and the lower bridge arm is closed; S k =0 means the upper bridge arm is closed and the lower bridge arm is open.

[0015] Under the condition that the three-phase voltage of the power grid is bala...

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Abstract

The invention discloses a fixed frequency model prediction control method for a voltage type PWM (Pulse Width Modulation) rectifier in the process of voltage unbalance drop. The key point of the technical scheme is as follows: the prediction control method comprises the steps as follows: carrying out a subtraction operation on second harmonic frequency given values of active power and reactive power and input active power and reactive power obtained by calculation; passing through a proportional resonant controller; calculating through a compensation voltage to obtain a second harmonic frequency compensation voltage in a two-phase static coordinate system and compensating into a predication model; obtaining three vector function time by a fixed frequency prediction control principle and sending to a modulator; and obtaining a switch signal for controlling a power converter by modulating. According to the fixed frequency model prediction control method, the second harmonic frequency fluctuation of the input power of the PWM rectifier can be effectively inhibited, so that the system is guaranteed to run in unit power factor, and the running quality of the rectifier is effectively improved.

Description

[0001] technical field [0002] The invention relates to a control method for a voltage-type PWM rectifier when the grid voltage is unbalanced and drops, and belongs to the field of power electronic power conversion device control, in particular to a fixed-frequency model predictive control method for a voltage-type PWM rectifier when the grid voltage is unbalanced and dropped. Background technique [0003] In recent years, power converter control methods based on model predictive control have been developed rapidly. Model predictive control is a control algorithm based on a mathematical model to predict the future response of the controlled object. The algorithm contains a value function defined according to the control target. By minimizing the value function, the algorithm predicts the optimal voltage vector in each sampling period as the action vector for the next cycle. Fixed-frequency model predictive control is a branch of model predictive control. This method adds ...

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Application Information

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IPC IPC(8): H02J3/24
Inventor 王萌施艳艳
Owner HENAN NORMAL UNIV
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