Inverter for instant voltage PID current PI digital control

Abstract

The invention discloses an instantaneous voltage PID current PI digital control inverted power supply. The output end of the current PI digital controller is connected with the control end of the inverter; the output end of the inverter is connected with the input end of a voltage transducer and a load; the output end of a voltage transducer is connected with the negative input end of a first substracter; the positive input end of the substracter receives reference quantity; the output end of the first substracter is connected with the input end of a voltage PID digital controller; the direct current end of the inverter is connected with a direct current power supply; the current led out from the inverter is connected with the input end of a current transducer; the output end of the current transducer is connected with the negative input end of a second substracter; the positive input end of the second substracter is connected with the output end of the voltage PID digital controller; and the output end of the second substracter is connected with the input end of the current PI digital controller. The inverted power supply is high in precision, quick and smooth in response, and small in total harmonic wave distortion of output voltage under nonlinear load condition. The inverted power supply can be widely applied to alternating stabilized power supplies, uninterruptible power supplies, active power filters and the like.

Description

technical field [0001] The invention relates to a power conversion circuit, in particular to an inverter power supply digitally controlled by instantaneous voltage PID (proportional integral differential) current PI (proportional integral). Background technique [0002] With the development of VLSI technology, the performance of microprocessors has been improved rapidly, and the cost and price have been continuously reduced, which makes the full digital control of inverter power supply more and more. Compared with analog control, direct digital control has the following advantages: From the perspective of noise and drift effects, digital controllers are far superior to corresponding analog controllers; they can quickly perform complex calculations with constant accuracy and have strong anti-interference ability; according to The control program (controller characteristics) can be easily changed if necessary, with strong versatility and easy upgrade; it has strong monitoring ...

AI Technical Summary

Problems solved by technology

The digital controller of the inverter power supply uses repetitive control to suppress periodic disturbances and improve the steady-state response of the system, but the dynamic response is not fast, at least over one fundamental wave period; deadbeat control has a faster dynamic response Speed, but the control performance is highly dependent on system parameters, sensitive to parameter changes, poor robustness, and may reduce system stability or even become unstable; conventional PI digital control has slow dynamic response and poor control accuracy

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