Electricity is the lifeblood of modern society. Any industry, whether household or industrial, requires stable electricity as its driving force. As society's demand for electricity grows, the complexity of the power grid is also gradually increasing. Today's power equipment is also gradually improving the stability and quality of voltage. Therefore, harmonic filters provide stable and high-quality power output for medium and high voltage power grids.
1. What Is A Harmonic Filter?
2. What Is A Harmonic Filter Made Of?
3. What Is The Harmonic Filter Circuit Diagram?
4. What Are The Types Of Harmonic Filters?
5. What Is The Purpose Of Harmonic Filter For Power System?
6. What Are The Advantages Of Harmonic Filter?
7. What Are The Disadvantages Of Harmonic Filter?
8. What Is The Filter, And What Are The Differences Between The Harmonic Filter And Hybrid Filter?
9. What Is The Impact Of Harmonic?
10. How Does A Harmonic Filter Work?
11. Why Harmonic Filter Important?
12. What Are The Applications Of Harmonic Filter?
13. What Are The Challenges And Limitations Of Harmonic Filter?
14. Active Harmonic Filters VS Passive Harmonic Filters: Which Should You Choose?
15. What Is The Life Expectancy Of Harmonic Filters?
16. Is An Active Harmonic Filter Better Than A Line Reactor?
LTEC Harmonic Filter
In medium and high voltage power grids, harmonic filters are devices specially used in series or parallel resonant circuits to shunt or block harmonics. They can not only reduce the distortion of harmonic voltage in the system, but also reduce the harmonic current flowing into the power system from the source. While improving the power factor in the power grid, they can also improve voltage stability, reduce network losses, filter harmonics in the system to an acceptable level, and reduce resonance.
What Is Harmonic Filter Made Of-sourced: electrical-engineering-portal
Harmonic filters are mainly composed of a series of resistors, inductors, and capacitors. They are an ideal solution for medium and high voltage grid efficiency and trouble-free operation, and improve voltage stability and quality. With the addition of more and more electronic devices and renewable energy, the harmonic distortion of power equipment has increased. Harmonic filters can solve such power quality problems, prevent equipment failures, and improve the operating efficiency of power equipment.
What Is The Harmonic Filter Circuit Diagram-sourced: elprocus
As shown in the figure below, the harmonic filter is mainly composed of a resistor, two capacitors, and two inductors. It is generally used for filtering high-order harmonics. In simple terms, the capacitor "C2" and the inductor "L2" are connected in series, and the inductor, resistor, and capacitor are connected in parallel in the secondary part.
There are two main types of harmonic filters on the market: passive filters and active filters.
Passive harmonic filters
Passive harmonic filters-sourced: hammondpowersolutions
Passive harmonic filters can filter out the high-frequency components of power equipment, thereby preventing harmonics from entering the power supply. It is mainly composed of inductors and capacitors. The disadvantage of this filter is that it is easily affected by external harmonics in the power supply and can easily cause overheating problems during operation, thereby damaging the equipment. Since it cannot prevent external harmonics from being absorbed, this type of harmonic filter is difficult to determine the size.
Active harmonic filters
Active harmonic filters-sourced: powerside
Active harmonic filters can detect and measure the harmonic frequencies generated by the drive, and inject an equal amount of harmonic current into the equipment in an opposite way, so that the harmonics and current cancel each other out, and finally control the harmonics within an acceptable range. During operation, the filter will not overheat even if the harmonics continue to increase.
What Is The Purpose Of Harmonic Filter For Power System-sourced: aktif
In the power system, the main function of the harmonic filter is to reduce or eliminate the harmonics in the power grid through some technology or means. By choosing passive harmonic filters or active harmonic filters, the harmonic current in the power equipment can be eliminated or offset, thereby eliminating harmonic distortion, making the power device run more stably, and the current more controllable and of high quality.
There are many advantages of harmonic filters, including the following:
Reduce or eliminate harmonics
Reduce or eliminate harmonics-sourced: powerquality
Harmonics generated in power equipment can easily affect the life or efficiency of the equipment. By adding harmonic filters, the harmonics in power equipment can be eliminated or offset by technical means, making the power transmission of power equipment more stable.
Enhance the power supply current
Enhance the power supply current-sourced: asme
By adding harmonic filters, the power supply current in the entire power system can be enhanced, making the equipment run more smoothly.
Increase the life of the power system
The generation or distortion of harmonics in power equipment can easily affect the life of the power equipment. Adding harmonic filters can extend the service life of the power system and improve the efficiency of equipment.
Reduce electricity costs
Reduce electricity costs-sourced: wini
By reducing or eliminating harmonics in power equipment, the electricity costs during the use of power equipment can be greatly reduced, and the benefits can be improved.
Harmonic filters also have limitations. They are manifested in:
Voltage distortion
Voltage distortion-sourced: packetpower
Due to the possible series resonance of the power supply, the current harmonics flowing into the passive filter are extremely large, which will cause voltage distortion.
High initial operating cost
High initial operating cost-sourced: thenounproject
Due to the huge size of the AC capacitor, the size of the filter may become larger accordingly, and the initial use and operating costs during use are very high.
Complex control system
Due to the complexity of the control and operation system of the harmonic filter. Therefore, during the operation of the power equipment, once the harmonic filter stops working, the equipment may be damaged.
A filter is a circuit in a power system. It can pass or block electrical signals of a specific frequency of power equipment. Its main function is to maintain the quality of electric energy, protect power equipment, and ensure that the current in power equipment can be transmitted efficiently.
The main difference between it and the harmonic filter is:
A harmonic filter is a type of filter. Filters are mainly divided into two types: harmonic filters and hybrid filters.
Harmonic filter
Harmonic Filter-sourced: kebamerica
- The main function of the harmonic filter is to reduce or offset the harmonic current generated by power equipment during operation, so as to ensure that the power system can operate efficiently and stably.
- Harmonic filters are mainly divided into two types, namely active harmonic filters and passive harmonic filters.
Hybrid filter
Hybrid Filter-sourced: andritz
The hybrid filter is a combination of active filters and passive filters.
It is specially used on specific occasions and makes full use of the advantages of these two filters. Therefore, its use system is more complex and can better cope with severe harmonic interference. Of course, its installation cost is higher than that of harmonic filters.
Harmonics mainly cause great losses to the power grid system and voltage system, including:
Reduced power efficiency
Reduced power efficiency-sourced: shehabd
Large harmonics or harmonic distortion will reduce the power factor of the power equipment in the system, thereby reducing the power generation, transmission, and power consumption efficiency of the power system and increasing electricity costs.
Shorten the service life of power equipment
Large harmonics or harmonic distortion will cause aging or loss of installed power equipment components, thereby shortening the service life of power equipment.
Equipment overload
Equipment overload-sourced: ronika
The equipment generates large harmonics or harmonic distortion, which can easily reduce the power factor of the equipment, causing the wires in the transformer to overload, overheat, or fail.
Equipment failure
Equipment failure-sourced: midamericaengine
Harmonic distortion will affect the transformer motor or cable in the power equipment to overheat, the neutral line current to be too large, and the electrical or capacitor equipment to fail.
Others
Other effects include triggering fuses, circuit breakers, or other protective equipment. The available capacity of the transformer or switchgear will be reduced.
How Does A Harmonic Filter Work-sourced: Electrical and Electronic tech
The main working principle of the harmonic filter is:
- By combining the capacitor and inductor in the circuit, resonance is generated at a specific frequency.
- The resonance generated by the capacitor and inductor can selectively filter out the harmonic frequencies in the system.
- While filtering out the harmonic frequencies, it can also have high impedance at the resonant frequency.
- Thereby effectively preventing the frequency from passing through the filter.
Why Harmonic Filter Is Important-sourced: emrassociates
The role of harmonic filters in the entire power system is crucial. It can maintain the health of the power grid and reduce the frequency of equipment damage by reducing the level of harmonic distortion in the system. Ultimately, it can improve the power quality of the entire power system. In addition, it can also ensure that the entire power system can meet various power regulatory requirements.
Harmonic filters are widely used. They can be used in various fields such as various industries, commercial and residential.
Industrial industry
Industrial industry-sourced: msb-engineering
Harmonic filters are widely used in many industrial industries such as steel production, chemical processing, and data control. This can reduce the level of harmonic distortion in the power system, thereby avoiding damage to equipment or reduction of life caused by harmonic distortion.
Commercial industry
Commercial industry-sourced: soundnewenergy
Harmonic filters are widely used in various hospitals, airports, and shopping malls. It can improve the power quality of power equipment, reduce power loss, and reduce costs.
Residential industry
Residential industry-sourced: solarmagazine
Harmonic filters can also improve the quality of household electricity, thereby reducing the risk of equipment loss. At the same time, it can also reduce power consumption and save on electricity bills.
Renewable energy industry
Renewable energy industry-sourced: coldwellsolar
Harmonic filters can also be used in various renewable energy applications, such as solar and wind energy, to help the sustainable development of the environment.
Harmonic filters also have limitations and challenges, including:
High installation, operation, and maintenance costs
When used in large industrial sites, the installation, operation, and maintenance costs of harmonic filters are very high, requiring a more complex and larger control system to adapt to the entire application scenario. Therefore, more professional equipment and teams are needed.
Equipment professionalism of harmonic filters
Equipment professionalism of harmonic filters-sourced: gravitypowersolution
Different industries also have different requirements for the equipment professionalism of harmonic filters. High-quality harmonic filters can effectively reduce and resist harmonic distortion without taking additional measures.
Active VS Passive Harmonic Filters-sourced: hammondpowersolutions
Active filters and passive filters are both types of harmonic filters. They can resist or adjust the distortion level of harmonics through their own technologies, thereby improving the power quality of the entire power system. But their differences are:
Active Harmonic Filters
LTEC Active Harmonic Filters
- Higher performance and flexibility
Active filters offer higher performance and flexibility. They can respond faster to changes in the power system. They eliminate harmonics while keeping the distortion level within acceptable limits.
- Flexible installation
Active harmonic filters can be installed at different locations in the power system, including the coupling point, main switchboard or near sensitive equipment. This greatly enhances the flexibility of the equipment.
- Power factor improvement
Active harmonic filters do not affect the leading power factor when the system is unloaded. This does not cause excessive stress on the power system, which can damage the equipment.
Passive Harmonic Filter
LTEC Passive Harmonic Filter
- Simple design
The design of a passive harmonic filter is simpler, and the cost is lower, which is suitable for small enterprises or small scenarios.
- Installation restrictions
The installation requirements of a passive harmonic filter are more stringent, and it must be installed close to the harmonic part. This will increase the complexity and cost of the whole system, and it cannot optimize the equipment conditionally.
What Is The Life Expectancy Of Harmonic Filters-sourced: depositphotos
The specific conditions of use and application scenarios determine the service life of harmonic filters:
The conditions that determine the life of harmonic filters mainly include the use environment, electrical load, and system design. Under normal conditions, the service life of harmonic filters is about 10 to 15 years.
Due to the use of long-life AC film capacitors and a high-grade steel core design, harmonic filters can ensure their durability even in the most harsh environments. According to the installation guide, you can use it in combination with the inverter to ensure the quality of the power equipment.
Line Reactor-sourced: wolfautomation
Harmonic filters and line reactors are two different devices. Harmonic filters mainly eliminate harmonics by injecting reverse current into the power system, while line reactors are simpler passive devices. They have limited filtering capabilities and mainly filter low-order harmonics. Therefore, harmonic filters perform better than line reactors in filtering high-order harmonics.
Harmonic filters are essential to the health of the power grid. To avoid harmonic distortion and filter high-order harmonics, avoid damage to equipment, and improve the efficiency of equipment use. If you want to learn more about harmonics and improve the reliability and stability of the power grid, you are welcome to consult us!
