In the power system, the safety, reliability and efficiency of power equipment are more important than anything else. Harmonic distortion of power equipment will lead to safety and efficiency problems of various power systems. Harmonic distortion will not only reduce the power efficiency of the equipment, but also cause damage to the equipment. In order to solve this problem, harmonic filters were invented.
This post will explain in detail what harmonic distortion like active and passive harmonics is and what problems harmonic distortion will cause. In order to solve harmonic distortion, how the active and passive harmonic filters will be applied to prevent and solve it. Hope it may solve all your problems.
Active And Passive Harmonic Filters-sourced: LTEC
1. What Is Harmonics?
2. What Are The Impacts Of Harmonics On Power System?
3. What Is Power Harmonics?
4. What Is Neutral And Ground Harmonics?
5. What Is Harmonic Filter?
6. What Are Active Harmonic Filters?
7. What Are The Types Of Active Harmonic Filters?
8. What Are The Advantages Of Active Harmonic Filters?
9. What Are Passive Harmonic Filters?
10. What Are The Types Of Passive Harmonic Filters?
11. Active Harmonic Filter VS Passive Harmonic Filter: A Scientific Analysis
12. What Are The Key Differences Between Active And Passive Harmonic Filters?
13. What Are The Advantages Of Using An Active Harmonic Filter Instead Of Passive One?
14. How Can The Active Harmonic Filter Improve Your Power Quality?
15. What Are The Operational Principles In Details For Active And Passive Harmonic Filters?
16. What Are The Maintenance Tips Required For Active Harmonic Filters?
17. What Are The Considerations For Selecting Active Harmonic Filters And Passive Harmonic Filters?
18. How Fast Can Active And Passive Harmonic Filters Respond?
19. What Is The Range Of Active And Passive Harmonic Filters?
20. What Is The Size And Installation Of Active And Passive Harmonic Filters?
21. What Is The Future Investment For Active And Passive Harmonic Filters?
What Is Harmonics-sourced: study
The most ideal sine wave in the power system is 60 Hz. If the harmonics in the power system deviate from the 60 Hz, the system will easily generate harmonic distortion. Harmonic distortion can easily lead to serious power loss of the equipment, affect the resistance elements and transformer core in the equipment, and thus reduce the power efficiency.
Harmonics in the power system refer to the frequency of current or voltage. The general basic frequency is 60 Hz, 120 Hz for the second harmonic, 180 Hz for the third harmonic. This sudden change in current will inject harmonic current into the power system and cause various power quality problems. The most prominent manifestations are voltage sag or surge, current or voltage imbalance, transformer overheating or frequent circuit breaker tripping.
Harmonics can cause a variety of problems, including:
Increased energy consumption
Increased energy consumption-sourced: electricneutron
When harmonics are injected into the power system, they can cause various power quality problems, resulting in a drop in power and an increase in power consumption, which can lead to increased electricity bills.
Equipment overheating
Equipment overheating-sourced: sigma
Harmonics may cause voltage drops or surges, as well as imbalances between various currents and voltages, transformers can overheat and circuit breakers can trip frequently.
Equipment damage
Equipment damage-sourced: hioki
Due to voltage instability, it is easy to cause repeated switching of power loads, causing a flickering effect. This may cause frequent tripping of circuit breakers and damage to equipment.
Reduced equipment life
Harmonics are a culprit for increasing energy consumption and reducing power. In addition to increasing electricity bills, it is easy to wear out equipment, which reduces the service life of the equipment.
Maintenance requirements
Because the equipment generates voltage and current instability due to harmonics, circuit breakers frequently trip, and the equipment needs to be shut down for too long, increasing the maintenance requirements of the equipment.
What Is Power Harmonics-sourced: elspec-ltd
Power harmonics refer to harmonics caused by nonlinear electronic loads in commercial or industrial power systems. They increase power system losses and potentially damage equipment. These harmonics cause power losses as current is transported.
What Is Neutral And Ground Harmonics-sourced: onicsenergy
Neutral and ground harmonics refer to the harmonics generated in the neutral and grounding elements in the power system. Unlike power harmonics, neutral and ground harmonics are prone to cause other power problems, such as increasing the risk of power outages in the system, reducing the power quality of the power system, and leading to higher maintenance costs.
What Is Harmonic Filter-sourced: LTEC
Harmonic filters are devices specifically designed to protect power systems and help protect against harmful harmonics that may damage power systems. They mainly include two types, active harmonic filters and passive harmonic filters. Each has its own advantages and disadvantages, and they can help improve the power quality and efficiency of the system and provide protection for the power system.
What Are Active Harmonic Filters-sourced: LTEC
The active harmonic filter has a compact structure, modular design and is easy to integrate. It can be continuously expanded as the demand for power systems grows in the future without taking up too much space. In addition, it can continuously monitor changes in the power system and quickly generate offset signals to eliminate harmonics.
Active harmonic filters are mainly divided into two types: parallel active filters and series active filters. They each have their own unique advantages and characteristics:
Parallel active filter
Parallel active filter-sourced: researchgate
It is mainly connected in parallel with the load and is used to estimate the harmonic current of the load. In the power system, it will generate compensation current to neutralize the harmonic components.
Series active filter
Series active filter-sourced: sciencedirect
It is mainly connected in series with the power system and offsets the harmonic voltage by injecting voltage, so that the load can become more stable.
The main advantages of active harmonic filters are:
Eliminate harmonics
Eliminated harmonics-sourced: powerquality
The main purpose of active harmonic filters is to eliminate harmonics in power systems. It mainly adapts to the changes in harmonic frequency and harmonic spectrum in the power system, generates reverse compensation current, offsets the components of various harmonics, and thus improves the parameters of power quality.
Improve power factor
Improved power factor-sourced: strongpowerelectric
Active harmonic filters can continuously adapt to harmonic changes, provide capacitive and inductive reactive power, eliminate harmonic frequencies, and thus improve power factor.
Cleaner and more stable energy
Cleaner and more stable energy-sourced: constellationenergy
By adopting advanced electronic technology and control algorithms, active harmonic filters can reduce harmonic distortion in dynamic processes and inject compensation current into electronic systems. This can provide a cleaner and more stable power supply for the entire system.
What Are Passive Harmonic Filters: -sourced: LTEC
Passive harmonic filters mainly eliminate unwanted frequencies through resistors, inductors and capacitors to achieve the purpose of eliminating harmonics. These components work together in different ways to produce specific harmonics in the power system. Generally, in order to obtain the best harmonic elimination effect, passive harmonic filters are generally placed near the harmonic source.
What Are The Types Of Passive Harmonic Filters-sourced: researchgate
Passive harmonic filters are mainly divided into single-tuned filters, double-tuned filters and high-pass filters. By using passive components such as reactors and capacitors in passive harmonic filters, these components are tuned to specific frequencies to filter out specific harmonic components in the system, reduce harmonics in the system, compensate for reactive power in the system, and improve power factor.
11. Active Harmonic Filter VS Passive Harmonic Filter: A Scientific Analysis
We can evaluate the effectiveness, cost-effectiveness, maintenance cost, and flexibility and adaptability of active harmonic filters and passive harmonic filters under different power conditions from the following aspects.
|
Aspects |
Active Harmonic Filter
Active Harmonic Filter-sourced: LTEC |
Passive Harmonic Filter
Passive Harmonic Filter-sourced: LTEC |
|
Efficiency |
Can reduce multiple frequencies at the same time; Actively adjust the grid harmonic current; Avoid overload at the limit; |
Usually can only filter out a single harmonic; Can only reduce harmonics of a fixed number within a specific frequency range; Cannot avoid overload; |
|
Cost |
High initial cost, but more cost-effective overall; Can correct multiple loads at once, a more affordable option; |
More cost-effective in large, single non-linear load applications; Low initial cost, but high maintenance cost; |
|
Maintenance |
Can adapt and respond to various harmonic frequencies; Configuration for various power systems Provides flexible solutions; Low maintenance costs; |
Prone to overheating of the equipment itself, and the results are unpredictable; Only applicable to single harmonic filtering requirements; |
|
Operational costs |
Requires continuous monitoring and maintenance, so the cost will be higher; Requires regular adjustments and inspections; |
It is a compensation method with less interference and does not require any maintenance; Poor adaptability and flexibility; |
|
Flexibility |
Can be applied to different power system configurations; Can adjust multiple different frequencies at one time; Higher flexibility; |
Need to be installed around the components that generate harmonics; It is a smaller maintenance device; Poor flexibility and adaptability; |
What Are The Key Differences Between Active And Passive Harmonic Filters-sourced: pulse
Both active harmonic filters and passive harmonic filters can control harmonics in power systems. But the key difference between them is the different control methods.
Active harmonic filters mainly harmonize and cancel out harmonics by generating harmonics with frequencies that match the harmonic frequencies but with opposite phases.
Passive harmonic filters mainly use passive components such as resistors, capacitors and inductors to adjust specific frequencies.
13. What Are The Advantages Of Using An Active Harmonic Filter Instead Of Passive One?
Compared with passive harmonic filters, the advantages of active harmonic filters are:
More adaptable
More adaptable-sourced: monolithicpower
Active harmonic filters are more adaptable and can control harmonic distortion below 5% at loads below 10%.
No power factor at no load
No power factor at no load-sourced: electricalvolt
It can be installed anywhere in the production line and will not produce power factor at no load.
High cost-effectiveness
Active harmonic filters are more cost-effective. It can handle the load of multiple inverters in complex situations.
14. How Can The Active Harmonic Filter Improve Your Power Quality?
How Can The Active Harmonic Filter Improve Your Power Quality-sourced: powerside
- In a normal circuit system, some harmonics generated by the inverter will trigger the protection device of the active harmonic filter.
- These harmonics can easily interfere with precision equipment and cause voltage distortion.
- By installing an active harmonic filter, a counteracting current is generated to offset these harmful harmonics.
- In this way, the power supply of the circuit system is stabilized and the overall power quality is improved.
- While improving the overall power quality, it can also protect precision electronic equipment. Improve energy efficiency and maximize cost-effectiveness, reducing the risk of downtime.
15. What Are The Operational Principles In Details For Active And Passive Harmonic Filters?
The operational principle for active and passive harmonic filters are:
Operational principle for active harmonic filters
Operational principle for active harmonic filters-sourced: researchgate
Apply professional equipment to monitor the harmonic distortion of the entire system, and then generate opposite current to offset these harmful harmonics.
Operational principle for passive harmonic filters
Operational principle for passive harmonic filters-sourced: hammondpowersolutions
Installed in the system, it guides specific harmonic currents in the entire device according to a predetermined path.
The best strategies for regular maintenance of harmonic filters include:
Check the physical condition of the harmonic filter
Check the physical condition of the harmonic filter-sourced: fluke
Use various equipment or visual inspection to check the physical appearance of the harmonic filter. This includes signs of looseness or wear of various components, as well as damage to the appearance of the equipment.
Software update status
Software update status-sourced: vecteezy
Regularly check the software updates of the harmonic filter so that any problems or errors can be corrected in time during the subsequent use of the equipment.
Regular calibration
Regular calibration-sourced: pruftechnik
Regularly read, record and calibrate the data of the harmonic filter. In the later use process, make the data match the actual electrical use conditions.
Temperature control
Temperature control-sourced: dwyeromega
Overheating will affect the use of the equipment and reduce its efficiency. During use, the operating temperature should be strictly controlled to avoid damage to the equipment.
When considering an active harmonic filter or a passive harmonic filter, you need to consider the following factors:
Inverter topology
Inverter topology-sourced: springernature
Most active harmonic filters now use a three-level NPC inverter topology. Compared with the traditional two-level topology, it can bring many advantages.
Related losses
Active harmonic filters and passive harmonic filters can produce different losses during the operation of the entire system, and the fluctuation is very large. Therefore, when choosing a suitable harmonic filter, the relevant losses should be considered.
Harmonic compensation capability
Harmonic compensation capability-sourced: mdpi
The harmonic compensation capability of active harmonic filters and passive harmonic filters is different, and this capability is crucial. It can greatly improve the performance of the entire system.
Response time
Power quality problems in the system may occur in an instant. Different harmonic filters have different response speeds and efficiencies.
Electromagnetic compatibility
Electromagnetic compatibility-sourced: media
Electromagnetic compatibility adopted by different countries or regions has strict regulations. You should consider the actual situation in your country and choose the corresponding harmonic filter.
Cost factor
The cost of active harmonic filters and passive harmonic filters is different. During the selection process, you can refer to your own budget and calculate the corresponding cost-effectiveness.
In the power system, the response speed is crucial for harmonic filters because the power load changes rapidly:
Active harmonic filters respond time
Active harmonic filters respond time-sourced: powerside
Active harmonic filters can correct harmful harmonics in the power system in a timely manner to meet the needs of modern power systems that need to adjust quickly.
Passive harmonic filters respond time
Passive harmonic filters respond time-sourced: monolithicpower
The response speed of passive harmonic filters is relatively slow. Its main function is to provide a stable and reliable solution to harmful harmonics for the power system in a predictable environment.
What Is The Range Of Active And Passive Harmonic Filters-sourced: emmismarine
Active harmonic filters and passive harmonic filters have different ranges and flexibility. Active harmonic filters can handle a variety of harmful harmonic problems and are suitable for a variety of complex circuit environments. Passive harmonic filters are only very effective within a standard range and have poor flexibility and are not suitable for more complex environments.
What Is The Size And Installation Of Active And Passive Harmonic Filters-sourced: hammondpowersolutions
Most circuit systems are now integrated systems, in terms of size and installation:
- Active harmonic filters are smaller and suitable for installation in different lines at any time. The modular design makes the installation process easier and can be expanded at any time according to your needs.
- Passive harmonic filters require more space and require more effort in the initial setup.
How To Choose The Right Harmonic Filters For Your Systems: Factors To Consider-sourced: houseplans
In the future investment process, if you consider the long-term benefits, the initial investment cost will be more. In the process of use, it can not only save your operating costs, extend the service life of electrical equipment, but also adapt to the requirements and flexibility of the ever-changing power system.
Conclusion:
Active harmonic filters and passive harmonic filters, although their ultimate purpose is the same, they are very different in the process and method of dealing with power systems. In the future, when choosing a harmonic filter, you need to choose a solution that matches your electrical system and can meet your specific needs. If you have more questions and needs later, you are welcome to consult us.
