Application of Elecnova Power Quality Products in Sewage Treatment Plant 2022 Sep.09

With China's increasing attention to environmental protection, there are more and more sewage treatment plants in various places. In order to improve the automation level and operation efficiency of equipment, sewage treatment plants have adopted a large number of power electronic equipment, such as frequency converters, soft starters, computers, uninterruptible power supply equipment, etc. 


This kind of equipment absorbs energy from the system in a way that is not a continuous sine wave, which will generate a large number of current harmonics. The impedance of the harmonic current flowing through the system will be superimposed on the power grid to distort the voltage of the power grid. The main hazards of harmonics are:

 

 

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The sewage treatment plant of a water resources bureau in Jiangsu Province once had the situation that the blowers could not operate normally due to large harmonics, especially when operating at full load. When multiple blowers need to work at the same time, it is often the case that starting one blower will lead to the shutdown of the other blower, which affects the production process of the sewage treatment plant, not only causing direct economic losses to users, but also may causing sewage pollution to the water environment. 


After learning about the problems encountered by the user, the field test found that the on-site harmonics were mainly generated by the frequency conversion control equipment such as the lift pump, oxidation ditch, blower, and return sludge pump, among which the 5th, 7th, 11th subharmonics are dominant. Elecnova designed a comprehensive solution of APF active harmonic filter + M series harmonic suppression module for this user. At present, this set of equipment has been running stably on site for more than 2 years, eliminating the troubles caused by harmonics to the normal production of users.

 


Main products of the project

 

SFR-M series

Introduction

SFR-M series intelligent dynamic harmonic suppression low-voltage power capacitor module is an integrated reactive power compensation product that aims at solving the harmonic and power factor problems in 0.4kV low-voltage distribution network with serious harmonic pollution, achieving power factor improvement, effective harmonic suppression, reducing line loss and improving power quality.

 

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Product Features

Advanced double zero-crossing switching technology ensures that the inrush current is less than 2 times the rated current;

Over temperature protection, over-current protection, imbalance protection, over-voltage protection and harmonic protection;

Online networking function, multiple modules can be connected in parallel as required;

Reasonable structure, all metal explosion-proof structure, active air cooling and heat dissipation;

Simple wiring and easy maintenance.

 

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Technical parameter


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Dynamic filter compensation device


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Product features

Flexible application scheme

 

Complete equipment and system protection

 

Excellent filtering performance

 

Humanized human-computer interaction experience.

 

With the economic development, the wide application of high-power thyristors, a large number of non-linear loads have increased, especially the progress of electronic technology, energy-saving technology and control technology, a large number of rectifier equipment, AC / DC converter equipment and electronic voltage adjustment equipment are used in the chemical, metallurgical, iron and steel, coal mine, transportation and other departments. 


Electric smelting equipment, electrochemical equipment, mine lifting equipment, open-pit mining equipment, electric locomotives and so on are increasing day by day, At the same time, the widespread use of a wide variety of lighting appliances, entertainment facilities and household appliances makes the waveform of the power system seriously distorted.

 

By using Elecnova reactive power compensation and active harmonic filter, to improve the power quality, enhance the safety and reliability of the system, improve the stability and efficiency of the equipment, and increase the service life of the equipment ; reduce the harmonic content, eliminate the threat of harmonic breakdown to the capacitor in the reactive power compensation device, avoid the burning caused by the possible parallel resonance of the system circuit, and ensure the normal operation of the equipment. It avoids the impact of harmonics on other users of the power grid and ensures that the sewage treatment plant can operate well and effectively.

 


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