Harmonics affect IT, communication/banking systems in two ways: conduction and radiation. The transmission status refers to the harmonic current introduced into the power supply system network by pulse current sources such as converters. The radiation source situation is that harmonic currents are introduced into the communication system. As mentioned above in the specification, “The purpose of the specification is to limit the actual harmonic voltage in the power supply system to a level (adaptive level) that will not cause harmful effects on sensitive equipment. Human common harmonic effects are mainly for harmonics The influence of wave current and characteristic impedance on the harmonic operating voltage caused by the transmission system software.
The damage of power engineering harmonics to the power grid depends on the harm of the harmonic working voltage to the machinery and equipment in the power grid, that is, the harmonic working voltage exceeds the level that the machinery and equipment can bear. The power supply party is responsible for the pulse current working voltage of the power supply network, and the power consumer is responsible for introducing the harmonic current of the system software.
In order to reduce the harm of harmonics to the power supply and distribution system, the basic idea is to start with the harmonic source, try to avoid the harmonic current around the harmonic source, and then reduce the harmonic voltage. The way to avoid harmonic current damage is to install an AC filter, which can reasonably restrain harmonic current, reduce fluctuations in the operating voltage of the power grid, and improve the quality of power transmission and distribution. In addition, it can flexibly use the high efficiency of power loads, and the service life is relatively long. Added, the filter provides a capacitive reactive load, which has a certain reactive power compensation effect, thereby improving the power factor of the system. According to whether the main loop includes source equipment, filters can be divided into active filters and passive filters.
With the development trend of information technology, communication/credit business, in order to meet the operation requirements of the main computer room of large and medium-sized data centers, the application volume of harmonic loads such as ups power supply in the power distribution equipment system software of information technology, communication/financial institutions has been significantly increased. The main harmonic sources of the low-voltage power distribution system of information technology, communication/financial institutions include UPS power supply, power transformer, frequency conversion air conditioner, etc. The harmonic current content generated by the equipment of various manufacturers varies greatly, but it is generally high. When the total harmonic distortion rate THDi of the current exceeds 50% (generally above 30%), the 5th, 7th, and 11th harmonics The current is severe, sometimes containing more than 3 harmonics.
User Value of Harmonic Governance
Improve the reliability of customer communication systems and power distribution equipment system software, increase the service life of customer communication equipment and power engineering; improve the transmission quality of communication data signals, ensure all normal transmission of communication data signals and performance indicators of communication equipment; eliminate variable Safety risks such as overheating of electrical appliances, overheating of power supply cables, reduction of current-carrying capacity, and voltage wave frame loss caused by pulse currents of electronic equipment such as UPS power supplies; increase energy consumption of central air-conditioning and other equipment in the house, and improve the system The power factor of the software achieves the purpose of energy saving and emission reduction.
Problems you may encounter?
1. The current reactive power compensation equipment cannot work normally or often burns out;
2. In communication systems, harmonics interfere with adjacent communication systems. The less noise, the worse the communication quality, the computer will not work properly, and the heavier the weight, the information will be lost, causing the system to crash
3. The protection relay is not working or malfunctioning, the electrical measuring instrument is not measuring accurately, and the precision electronic products will be seriously affected or even damaged.
Our solution:
1. Use Hongyan passive filter equipment to provide a low-impedance channel for harmonics of a certain frequency, and remove the harmonics to achieve the effects of harmonic countermeasures and reactive power compensation
2. Use the active filter Hongyan APF to manage the harmonics, and the static safety compensation device to compensate the reactive power of the system, so that the harmonic content and power factor of the system can meet our company’s standards
3. The active filter Hongyan APF is adopted, most of the capacitors of the active filter remove the harmonic filter, and a part of the capacitor compensates the reactive power, improves the power factor, and effectively manages the harmonics and reactive power of the system.
Post time: Apr-13-2023