The importance of harmonic control Xiangyang Yuanchuang Electric has been committed to the development of industrial control electrical industry, "survive by quality, create brand by reputation" to adhere to the electrical products with good quality and reputation. The filter compensation device is also with Tsinghua University and Wuhan. University cooperation has achieved significant benefits.
This chapter mainly analyzes several methods of governance of harmonics.
With the development of power electronics technology, inverters are increasingly used in many fields such as power electronics systems and industries. The high-order harmonics generated by inverters are also increasingly harmful to the public power grid.
These include:
1) Harmonics cause additional harmonic losses in components in the power grid, reducing the efficiency of power generation, transmission, and electrical equipment. A large number of 3 harmonics flowing through the neutral line can overheat or even cause a fire.
2) Harmonics affect the normal operation of various electrical equipment, causing mechanical vibration, noise and overheating of the motor, causing severe overheating of the transformer, causing overheating of capacitors, cables and other equipment, causing insulation aging, shortening life and even damage;
3) Harmonics will cause local parallel resonance and series resonance in the power grid, which will amplify the harmonics and cause serious accidents;
4) Harmonics will cause interference to adjacent communication systems, lighter noise will be generated, and communication quality will be reduced, resulting in loss of information and failure of the communication system to work properly;
5) Harmonics can cause relay protection and malfunction of the automatic device, and make the measurement of the electrical measuring instrument inaccurate.
Since the harmonic voltage and harmonic current in the utility grid cause great harm to the electrical equipment and the power grid itself, many countries in the world have issued national standards for limiting the harmonics of the power grid, and the authority has established regulations for limiting harmonics. The harmonic standards set by countries all over the world are mostly close. In 1993, China's Technical Supervision Bureau issued the National Standard (gb/t14549-93) "Power Quality Harmony of Utility Grid", which was implemented from March 1, 1994.
The frequency converter is one of the most widely used equipment in the field of industrial adjustment transmission. The frequency converter is a device that converts the power frequency (50hz) into an AC power source of various frequencies to realize the variable speed operation of the motor. The control circuit completes the control of the main circuit, the rectifier circuit converts the alternating current into direct current, and the direct current circuit smoothes the output of the rectifier circuit, and the inverter circuit inverts the direct current into alternating current. Due to the switching characteristics of the inverter inverter circuit, a typical non-linear load is formed for the common power supply. Therefore, the power electronic device represented by the frequency converter is one of the most important harmonic sources in the public power grid.
Harmonic refers to each component of the quadratic series decomposition of periodic non-orthogonal alternating current quantities that is greater than an integer multiple of the fundamental frequency, and is also commonly referred to as higher harmonics. Since there are various sources of harmonics in the power system (harmonic sources are electrical devices that inject harmonic currents into the utility grid or generate harmonic voltages in the utility grid), especially devices such as converters. The mechanism for generating harmonics on the input side of the inverter is that any rectifier circuit on the power supply side generates harmonics due to its nonlinearity. The mechanism for generating harmonics on the output side of the inverter is: In the inverter circuit, for a voltage type circuit, the output voltage is a rectangular wave. For current-mode circuits, the output current is a rectangular wave. Rectangular waves contain more harmonics, which have an adverse effect on the load. Therefore, even if the voltage of the power supply in the power system is a sine wave, there will always be harmonic current or voltage in the power grid due to the existence of nonlinear components. Therefore, the existence of grid harmonics mainly lies in the existence of various nonlinear components in the power system.
The active filter compensation device is the most ideal harmonic control. If you are interested, please consult my company.
Http://news.chinawj.com.cn Editor: (Hardware Business Network Information Center) http://news.chinawj.com.cn
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Type |
BLDS-3060 |
BLDS-4080 |
BLDS-5080 |
BLDS-60100 |
BLDS-80100 |
|
Input power |
AC380V/50Hz; AC220V/50Hz |
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|
Track gauge(mm) |
3000 |
4035 |
5000 |
6000 |
8000 |
|
Effective cutting width(mm) |
2300 |
3300 |
4300 |
5300 |
7300 |
|
Machine width(mm) |
3500 |
4300 |
5500 |
6500 |
8500 |
|
Track length(mm) |
6000 |
8000 |
8000 |
10000 |
10000 |
|
Number of cutting torch(set) |
2 |
2 |
2 |
2 |
2 |
|
Lift(mm) |
200 |
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|
Cutting thickness(mm) |
1~30(According to the power supply size) |
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Cutting speed (mm/min) |
450~5000 |
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Idle speed(mm/min) |
0~8000 |
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Drive mode |
Bilateral drive |
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System |
Shanghai Jiaoda or Beijing Starfire |
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Operating accurancy |
±0.5mm |
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