An improved method for current proportional-integral repetitive control of grid-connected converters
A technology of repeated control and current ratio, applied in the field of power electronics, can solve the problems of sudden change of control amount, dynamic response speed difference, grid-connected current distortion, etc., and achieve the effect of reducing the amount of error mutation and eliminating distortion.
Inactive Publication Date: 2020-02-07
XIAN XJ POWER ELECTRONICS TECH
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Problems solved by technology
The proportional-integral controller accumulates the error once every 1 beat (1 sampling period), and the dynamic response speed of the two controllers is different.
When the command mutation or the feedback mutation caused by the disturbance causes the error e(z) to change suddenly, the proportional-integral controller can respond quickly and enter the steady state quickly, but the repetitive controller accepts the error mutation within N beats, and in a base After the wave period, the control quantity will be disturbed, and then the control quantity will change suddenly, and the grid-connected current will be distorted.
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[0031] The invention provides an improved method for the proportional integral repetitive control of the current of a grid-connected converter. The steady-state output of the repetitive control algorithm part is obtained within k fundamental wave cycles to obtain the maximum value and the minimum value, and use them as the input error The limit value of the signal, the error signal after the limit is input into the repetitive control algorithm.
[0032] see figure 2 , a method for improving the current proportional integral repetitive control of a grid-connected converter of the present invention, the specific steps are as follows:
[0033] Step 1: Initialize the limit value e of the error signal e(z) max , e min Respectively +1, -1 (per unit);
[0034] Step 2: Calculate the maximum value and the minimum value of the repeated control output value of k fundamental wave cycles, and assign them to e respectively max , e min ;
[0035] Step 3: Use the clipping value e max ...
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The invention discloses an improved method for current proportional-integral repetitive control of a grid-connected converter. The steady-state output of the repetitive control algorithm part is observed, and the output maximum and minimum values of the repetitive controller are observed in the steady state, and the output maximum and minimum The value is used as the limiting value of the input error signal, and the error signal after limiting is input into the repetitive control algorithm. Since the repetitive control is mainly aimed at the steady-state error, and the control of the dynamic process is mainly realized by PI, this method limits the error accumulation of the repetitive control in the dynamic process, and reduces the amount of error mutation accepted by the repetitive controller within N beats. Therefore, the interference control quantity will not be generated after one fundamental wave cycle, the distortion in the dynamic process of grid-connected variable flow is eliminated, and the dynamic control characteristics are not affected.
Description
technical field [0001] The invention belongs to the field of power electronics, and in particular relates to an improved method for current proportional integral repetitive control of a grid-connected converter. Background technique [0002] With the wider application of new energy grid-connected power generation systems, the quality of grid-connected current has attracted more and more attention. In order to prevent pollution of the power grid, many standards at home and abroad have put forward higher requirements for the quality of grid-connected current. In the grid-connected system, the converter is the core component, so the current control technology for the grid-connected converter has attracted extensive attention. [0003] At present, the current control technologies for grid-connected converters that have a certain engineering application foundation are as follows: [0004] 1) Proportional integral (PI) control; [0005] 2) Proportional resonance (PR) control; ...
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IPC IPC(8): H02M1/00H02J3/38
CPCH02J3/38H02M1/00H02M1/0003
Inventor 黄辉张海龙王林曹建博肖飞赵建荣黎阳凤勇
Owner XIAN XJ POWER ELECTRONICS TECH