DC (Direct Current)-AC (Alternating Current) inversion power supply controlled on the basis of energy balance

Abstract

The invention discloses a DC (Direct Current)-AC (Alternating Current) inversion power supply controlled on the basis of energy balance, and belongs to the field of electric control. The power supplycomprises a main circuit and a control circuit thereof, wherein in the main circuit, U1 is an external direct current power supply, K1, K3 and K5 means three switching tubes positioned on an upper half bridge arm, K2, K4 and K6 means three switching tubes positioned on a lower half bridge arm, L is a three-phase filtering inductor, C is a filtering capacitor, and R is an external three-phase symmetric load. The control circuit comprises an input power detection unit W1, a storage energy detection unit W2, a load output energy prediction unit N0, an energy storage element energy prediction unitN1, a load distinguishing unit F1, an integral circuit j1, a subtraction circuit J2, a subtraction circuit J3, a division circuit C1, a multiplying circuit C2, a comparison circuit B1, AND logic circuits A1, A2 and A3, a PWM (Pulse-Width Modulation) pulse modulation circuit M1 and a switching tube driving circuit D1. By use of the power supply, through the calculation of each part of energy in aninversion circuit, finally, the energy balance is taken as a basis for realizing inversion control.

Description

technical field [0001] The invention relates to a DC-AC inverter control technology, in particular to a DC-AC inverter control technology with a PWM signal as the control period, and belongs to the field of electric control. Background technique [0002] PID controller (Proportion Integration Differentiation. proportional-integral-differential controller) is composed of proportional unit P, integral unit I and differential unit D. Through the setting of Kp, Ki and Kd three parameters. PID controllers are mainly suitable for systems whose basic linear and dynamic characteristics do not change with time. [0003] A PID controller is a common feedback loop component in industrial control applications. The controller compares the collected data to a reference value and uses the difference to calculate a new input value that is intended to bring the system's data to or stay at the reference value. Different from other simple control operations, the PID controller can adjust th...

AI Technical Summary

Problems solved by technology

However, the PID controller depends too much on the parameter setting for the dynamic performance adjustment of the system. If the parameter setting is not ideal, its output voltage will often have a large overshoot and oscillation, and even exceed its safe operating limit, causing damage to the system.

However, the tuning of PID parameters will waste a lot of time, and the actual control effect after tuning is often unsatisfactory.

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