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PID parameter selection method applicable to DC/AC conversion

A parameter and parameter change technology, applied in the field of DC/AC inverter control in the field of electric power technology, can solve problems such as difficult to meet application requirements, and achieve the effect of speeding up the calculation level

Active Publication Date: 2019-01-22
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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  • PID parameter selection method applicable to DC/AC conversion
  • PID parameter selection method applicable to DC/AC conversion
  • PID parameter selection method applicable to DC/AC conversion

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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 PID parameter selection method applicable to DC / AC conversion, characterized by performing PID control on a difference value of a feedback quantity and a given target value by taking an output sine-wave voltage uac of a DC / AC inverter circuit as the feedback quantity and a reference sine-wave voltage uacref as the given target value, so as to generate a PWM signal to control the DC / AC inverter circuit, thus the output sine-wave voltage uac tracks the reference sine-wave voltage uacref; the PID parameters are not fixed, nonlinear fitting is performed on a variation trend of the PID parameters according to the reference sine-wave voltage uacref, and amplitude limiting is performed on a fitted curve by setting a maximum limit value and a minimum limit value of PID. Compared with an existing control technology, the PID parameter selection method disclosed by the invention can select the PID parameters more reasonably, more quickly, more succinctly and more purposefully, guarantees that an output waveform during DC / AC can track a given sine wave in real time and reduces 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 Applications(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