Digital controlled inverter and its control method

Abstract

This invention discloses a digit controlled inversion supply and its control method, in which, the output of an augmented state feedback digit controller is connected with the input of an inverter, the output of which is connected with the input of a voltage sensor and a load, the first output end of the voltage sensor is connected with the negative input of a subtracter, the positive input of which receives reference volume ur, the output of which is connected with the input of a controller, the inverter is connected DC supply, the current led out from the inverter is connected with the input of the current sensor, the output of which and a second output of the voltage sensor are connected with the negative input of the controller constituting a microprocessor with the subtracter.

Description

technical field [0001] The invention relates to a power conversion circuit, in particular to a digitally controlled inverter power supply and a control method thereof. Background technique [0002] With the development of science and technology and the improvement of informatization, on the one hand, important departments and electrical equipment have increasingly high requirements for power supply quality; on the other hand, the extensive use of power electronic equipment and the continuous increase of nonlinear loads make the harmonic Pollution is very serious, forming a sharp contradiction between supply and demand. For this reason, the research of high-performance PWM inverter power supply has attracted more and more attention in recent years. [0003] Compared with analog control, digital control has many advantages, so it has been widely concerned. Especially in recent years, with the rapid development of microelectronic technologies such as microprocessors, the hard...

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Problems solved by technology

When the digital controller of the PWM inverter adopts the conventional control strategy, the response characteristics are not good, and the performance is significantly lower compared with the conventional analog controller; the repetitive control can well suppress the periodic disturbance and improve the steady-state response of the system, but the dynamic response Not fast, at least above one fundamental wave cycle; Deadbeat control has a fast 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 fail Stable; it can be seen that although several special digital control methods that can better utilize the advantages of digital control have been proposed, there are deficiencies

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