Direct-current bus voltage control method based on PID algorithm

A technology of DC bus voltage and control method, which is applied in the direction of calculation, instrumentation, data processing, etc., which can solve the problems of lack of market competitiveness of products, power consumption of braking units, and small profit margins, so as to reduce electricity expenses and eliminate wear and tear , the effect of increasing the profit margin

Inactive Publication Date: 2016-08-31
SHENOU COMM EQUIP
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Problems solved by technology

In the traditional fast saw frequency conversion transformation scheme, a general-purpose frequency converter is used to adjust the sawing speed, and a braking unit is used to consume a large amount of electric energy fed back by the motor
Simple use of ordinary

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  • Direct-current bus voltage control method based on PID algorithm
  • Direct-current bus voltage control method based on PID algorithm
  • Direct-current bus voltage control method based on PID algorithm

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Embodiment Construction

[0018] A PID algorithm-based DC bus voltage control method,

[0019] Take the following steps:

[0020] a. Set the given amount S(k) for PID regulation. The value of S(k) is set as the percentage of the three-phase input standard bus voltage Uref and the maximum bus voltage Umax allowed during system operation, that is, Uref / Umax (people The value of different maximum bus voltage Umax can be set according to different equipment, so that the adjustment method of the present invention has a wider adaptability);

[0021] b. Set the feedback amount F(k) for PID adjustment, and the value of F(k) is set as the percentage of the real-time bus voltage Udc to be detected and the maximum bus voltage Umax, that is, Udc / Umax (because there will be Larger voltage fluctuations, so the combination of real-time tracking bus voltage and PID adjustment algorithm can intelligently track voltage fluctuations caused by frequency changes, and compare the difference between the feedback amount obta...

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PUM

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Abstract

The invention discloses a direct-current bus voltage control method based on a PID algorithm. According to a PID algorithm formula: [delta]u(k)=A*E(k)+B*E(K-1)+C*E(K-2), constant parameters are given, a PID adjusting algorithm and a real-time tracking bus voltage are combined, so that the voltage fluctuation caused by frequency changes can be intelligently tracked; and the difference change between a feedback quantity obtained by the current voltage and a given quantity obtained by a standard voltage is compared to define a voltage fluctuation amplitude, the method provided by the invention is more energy-saving when compared with conventional frequency conversion reconstruction, an external brake resistor for energy consumption is not needed, and the output voltage is adjusted in a self-adaptive manner according to the bus voltage monitored in real time, so that the waste of electricity is reduced, the electricity charge is reduced, and the profit rate is improved. By adopting the adjusting method of the invention, the wearing to transmission and movement parts caused by hard starting and hard stopping of the device is eliminated, so that the service lifetime of the device is prolonged, the maintenance frequency is reduced, and the utilization rate of the device is improved.

Description

technical field [0001] The invention relates to the field of industrial control, more specifically, it relates to a method for calculating bus voltage. Background technique [0002] Stone fast sawing machine is widely used in stone industry. Also known as gang saw, sand saw, block saw; compared with traditional cutting methods, it has the advantages of fast processing speed and high product quality. In the traditional fast saw frequency conversion transformation scheme, a general-purpose frequency converter is used to adjust the sawing speed, and a braking unit is used to consume a large amount of electric energy fed back by the motor. Simple use of ordinary frequency converters to consume excess power will still cause high electricity bills and poor energy-saving effects when the voltage fluctuates greatly, resulting in small profit margins for enterprises and lack of market competitiveness for products. Contents of the invention [0003] Aiming at the deficiencies in t...

Claims

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Application Information

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IPC IPC(8): G06Q50/06
CPCG06Q50/06
Inventor 葛息杰陈正华叶旭波
Owner SHENOU COMM EQUIP
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