A double closed-loop control method based on traditional vsr current closed-loop control

Abstract

The invention discloses a double closed-loop control method and system based on traditional VSR current closed-loop control, belonging to the field of power electronics and its control technology; thesteps of the present invention are as follows: 1. The DC bus voltage of the rectification side is an outer ring, and the PI is passed through the PI. Adjusting to obtain the given value of the outputactive power; 2. Obtaining the given set value and the reactive power set value through the current command calculation module to obtain the active current command value and the reactive current command value; 3. The obtained active current The command value and the reactive current command value are adjusted by the current loop to obtain two values; 4. The two values are converted into a two-phase [alpha][beta] stationary coordinate system by synchronous coordinate transformation, and two other values are obtained; 5. Through SVPWM Generate six PWM signals to control VSR operation. The invention adds a new method for calculating the current command, thereby overcoming the problem that the dynamic response of the vector control strategy of the traditional VSR current closed loop is slow,the total harmonic distortion rate of the grid current is large, and the anti-interference performance to disturbance such as load variation is poor.

Description

technical field [0001] The invention belongs to the technical field of power electronics and its control, and more specifically relates to a double closed-loop control method based on traditional VSR current closed-loop control. Background technique [0002] The control algorithm is the core of the PWM rectifier. The quality of the control method directly determines the operation effect of the rectifier. Its main task is to maintain the stability of the DC side voltage and the sinusoidalization of the input and output current pairs of the VSR. Traditional control strategies mainly include current closed-loop vector control strategy (VOC) and direct power control strategy (DPC). Among them, the dynamic response of the current closed-loop vector control strategy (VOC) is slow, which leads to poor anti-interference performance of disturbances such as grid harmonics and load changes. Although the power inner loop of the direct power control strategy (DPC) has the characteristic...

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Problems solved by technology

[0014] Aiming at the problems of the existing traditional VSR current closed-loop vector control strategy with slow dynamic response, large grid current total harmonic distortion rate and poor anti-interference performance to disturbances such as load changes, the present invention provides a traditional VSR current closed-loop control based Double closed-loop control method; the invention adds a new method of current command calculation under the traditional control strategy through the serial use of the three modules of voltage outer loop I, current command calculation module II, and current inner loop III

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