Inverter automatic variable coefficient control method

Abstract

The invention discloses an automatic variable coefficient control method for an inverter, comprising the following steps of carrying out AD (Analog-Digital) current sampling on the real-time output current of the inverter by a sampling processing circuit and transmitting a current value obtained through sampling to a digital signal processor; carrying out different processing on the current value obtained through sampling and a set current value to obtain a current error value; and adjusting the current error value through a proportion-integration (PI) regulator to obtain a required output current value. The method is suitable for being applied to the occasion that the output current of the inverter needs to be rapidly adjusted according to the external conditions; the steady state and dynamic performances of the inverter can be improved roundly through adjusting the proportionality coefficient (P) of the proportion-integration (PI) regulator and combining the control over the integration quantity on the basis of system reliability and stability; the dynamic response time of the inverter is effectively improved; and the overshoot quantity in the adjustment process can be reduced.

Description

technical field [0001] The invention relates to an inverter control method, in particular to an inverter automatic variable coefficient control method. Background technique [0002] The inverter is a device that converts direct current into alternating current. For the control of the inverter, two methods of hardware control or software control are mostly used. The output current of traditional inverters is mostly a constant value during operation, and the output current does not need to be set arbitrarily, or even if the output current can be set, the current changes slowly during the switching process of the output current. [0003] Most of the existing inverter control technologies do not change the control coefficient, that is, the proportional coefficient (P) of the proportional-integral (PI) regulator and the integral coefficient ( I) The values ​​of these two parameters are fixed. The proportional coefficient (P) determines the dynamic response of the system, and the...

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Problems solved by technology

[0003] Most of the existing inverter control technologies do not change the control coefficient, that is, the proportional coefficient (P) of the proportional-integral (PI) regulator and the integral coefficient ( I) The values ​​of these two parameters are fixed. The proportional coefficient (P) determines the dynamic response of the system, and the integral coefficient (I) determines the steady-state characteristics of the system. When the output current value needs to be changed, due to the running The proportional coefficient (P) and the integral coefficient (I) remain unchanged. When the set current value is far from the output current value, the current will slowly switch to the set current value. This control method has certain advantages. The disadvantages are reflected in the slow dynamic response when the current is switched, which cannot meet the requirements for the current to be quickly switched to the set value

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