Which Filtering Equipment Should Be Used to Reduce Grid Harmonics by 5%-10%

With the continuous development of power systems, harmonic pollution has become an issue that cannot be ignored in grid operation. Harmonics refer to the distortion of current and voltage in AC power systems caused by non-linear loads, which can lead to reduced efficiency and damage to power equipment, as well as affect power quality. Therefore, reducing the level of harmonics in the grid, particularly by 5%-10%, is crucial for ensuring stable grid operation and the normal functioning of electrical equipment.

 

I. What Are Grid Harmonics?

1. Definition of Harmonics
Harmonics are components in the AC voltage or current of a power system whose frequencies are integer multiples of the fundamental frequency. Typically, the grid frequency is 50Hz or 60Hz, so the generated harmonic frequencies are 100Hz, 150Hz, 200Hz, and so on. These high-frequency components of current and voltage can cause overheating, damage, and system instability in electrical equipment.

2. Impact of Harmonics on the Grid
2.1 Equipment Overheating: Harmonics lead to additional heat generation in equipment, reducing its service life.
2.2 Reduced Efficiency: Harmonics cause a decrease in equipment operational efficiency, increasing energy consumption.
2.3 Decline in Power Quality: Distortion of voltage and current waveforms can affect the normal operation of other equipment and even lead to failures.

II. Goals and Significance of Reducing Harmonics by 5%-10%

1. Extending the Service Life of Electrical Equipment: Reducing harmonic damage prolongs the lifespan of equipment such as transformers, switching devices, and motors.

2. Lowering Energy Loss: The presence of harmonics increases the consumption of ineffective energy, and reducing harmonics can effectively minimize energy loss.

3. Improving Grid Stability: Enhanced power quality in the grid helps improve system stability, avoiding issues such as voltage fluctuations and frequency deviations.

III. Common Harmonic Filtering Equipment

1. Active Power Filter (APF)
●Working Principle: By using power semiconductor switches (such as IGBTs), APF can track harmonics in real time and output current waveforms opposite to them, canceling out the original harmonics and effectively eliminating them.
●Advantages: High efficiency, real-time response, capable of handling multiple harmonic frequency bands and dynamic load changes.
●Applicable Scenarios: Suitable for environments with high-frequency harmonics, significant load fluctuations, and multiple harmonic sources.
●Suitability for Reducing Harmonics by 5%-10%: Active Power Filters can dynamically adjust compensation and precisely control harmonic levels in cases of severe harmonic pollution, making them highly suitable for achieving the goal of reducing harmonics by 5%-10%.

2. Reactor

●Low voltage detuned filter reactors is an inductive coil specifically designed to be installed in series with a power capacitor bank to form a detuned filter. Its primary purpose is to protect the capacitor bank and the electrical system from damaging harmonic currents while still providing power factor correction.

●LED lighting drivers,UPS systems,Computers and servers,these loads draw current in non-sinusoidal pulses, injecting harmonic currents (typically the 3rd, 5th, 7th, etc.) back into the electrical system.Our low voltage detuned filter reactors can eliminate the risk of dangerous parallel resonance, protecting the entire electrical system.

●Advantages:Suppress 2nd to 25th harmonic,Limits Short-Circuit & Inrush Currents - Protects critical electrical equipment,Stabilizes Voltage - Compensates capacitive reactive power, prevents overvoltage