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A pid parameter selection method suitable for dc/ac change

A parameter and parameter change technology, applied in the field of DC/AC inverter control in the field of power technology, can solve problems such as difficulty in meeting application requirements, achieve significant economic and social benefits, speed up the level of operation, and reduce damage.

Active Publication Date: 2021-09-03
广西南宁市晨启科技有限责任公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] However, with the improvement of power quality requirements, it is becoming more and more difficult for the current DC / AC type products to meet the application requirements.

Method used

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  • A pid parameter selection method suitable for dc/ac change
  • A pid parameter selection method suitable for dc/ac change
  • A pid parameter selection method suitable for dc/ac change

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Embodiment Construction

[0032] The specific implementation of the present invention will be described below through specific examples. The details of this specification can also be modified or modified based on different viewpoints and applications without departing from the spirit of the present invention.

[0033] The PID parameter selection method suitable for DC / AC changes of the present invention is suitable for DC / AC systems where direct current is converted into alternating current, such as figure 1 As shown, the DC power supply outputs DC to the DC / AC inverter circuit, and the AC signal u output by the DC / AC inverter circuit ac The feedback is connected to the subtraction terminal of the arithmetic unit, and the reference sine wave voltage u acref The given target value is connected to the addition terminal of the arithmetic unit, and the arithmetic unit is used for the target value u acref and the output value u ac After the difference is compared, it is output to the PID control unit, and...

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Abstract

The invention discloses a method for selecting PID parameters suitable for DC / AC changes, which is characterized in that: the output sine wave voltage u of the DC / AC inverter circuit ac As the feedback quantity, the reference sine wave voltage u acref For a given target value, PID control is performed on the difference between the feedback amount and the given target value to generate a PWM signal to control the DC / AC inverter circuit to output a sine wave voltage u ac Track reference sine wave voltage u acref ; The PID parameter is not fixed, and the PID parameter change trend is based on the reference sine wave voltage u acref Perform nonlinear fitting, and limit the fitting curve by setting the maximum limit value and minimum limit value of PID. Compared with the existing control technology, the PID parameter selection method of the present invention can be more reasonable, faster, more concise, and more purposeful in selecting PID parameters, ensuring that the output waveform in DC / AC can track the given sine wave in real time wave, reducing distortion.

Description

technical field [0001] The invention relates to the technical field of DC / AC inverter control in the electric power technology field, in particular to a PID parameter selection method suitable for DC / AC changes. Background technique [0002] With the improvement of living standards and the diversification of household electronic products, the dependence on electricity is getting stronger. Therefore, DC / AC products such as inverters and UPSs have risen sharply in recent years. There are two main reasons: the unreliability of the power grid. When the power grid fails, inverters and UPS will become life-saving artifacts to maintain daily life and work; With the rise of tourism, outdoor outings, mountain camping and self-driving tours, a DC / AC product such as an inverter or UPS will greatly improve work efficiency and life comfort. [0003] However, with the increasing requirements on power quality, it is increasingly difficult for the current DC / AC type products to meet the ap...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G05B11/42H02M7/48
CPCG05B11/42H02M7/48
Inventor 吴忠深邓海华洪鹤隽梁昌豪李倍存罗晓星
Owner 广西南宁市晨启科技有限责任公司