How Active Harmonic Filters Eliminate Harmonics While Static Var Generators Improve Power Factor

소개

Modern industrial facilities rely heavily on nonlinear electrical equipment such as variable frequency drives (VFD), 서보 모터, UPS 시스템, 로봇 생산 라인, EV 충전기, 용접 기계, 재생에너지 시스템. While these technologies significantly improve efficiency and automation, they also introduce serious power quality problems.

선임 전기 기술자로서 코퍼워, I frequently encounter customers who ask the same question:

“Should I install an 활성 고조파 필터 or a Static Var Generator?”

The answer depends on the electrical issues your facility is experiencing.

Many engineers mistakenly believe that harmonics and low power factor are the same problem. They are not. Although both reduce electrical system efficiency, they originate from different causes and require different solutions.

이 기사에서는, I’ll explain:

What harmonics are
Why poor power factor occurs
How Active Harmonic Filters eliminate harmonics
How Static Var Generators improve power factor
Why many industrial plants benefit from installing both devices together

These technologies form the foundation of modern power quality management and help factories improve efficiency, reduce downtime, and protect valuable electrical assets.

Understanding Harmonics and Power Factor

Before selecting the proper solution, it’s important to understand the difference between these two common electrical problems.

고조파란 무엇인가?

In an ideal power system, current should flow as a perfect sine wave.

하지만, nonlinear loads—including:

가변 주파수 드라이브 (VFD)
UPS 시스템
서보 드라이브
정류기
인버터
EV 충전기

draw current in pulses rather than smoothly.

These pulses generate harmonic currents that distort the original sine wave.

일반적인 고조파 차수는 다음과 같습니다.:

3rd
5th
7th
11th
13th

과도한 고조파는 다음을 유발할 수 있습니다.:

변압기 과열
케이블 과열
커패시터 뱅크 오류
모터 진동
PLC malfunction
Nuisance breaker trips
에너지 손실 증가
장비 수명 감소

What Is Poor Power Factor?

Power factor measures how efficiently electrical power is used.

When inductive loads such as motors or transformers consume reactive power, the current lags behind the voltage.

The utility must deliver more current to provide the same amount of useful power.

결과는 다음과 같습니다:

유틸리티 역률 패널티
Higher transformer loading
케이블 손실 증가
전압 불안정
시스템 용량 감소

Unlike harmonics, poor power factor is primarily caused by reactive power—not waveform distortion.

그러므로, solving one problem does not automatically solve the other.

How Active Harmonic Filters Eliminate Harmonics

an 활성 고조파 필터 (AHF) is designed specifically to remove harmonic currents from the electrical network.

Unlike passive filters that only target specific harmonic frequencies, modern AHF systems continuously monitor the power system and dynamically compensate for changing harmonic content.

단계 1: Detect Harmonic Current

Current transformers continuously measure load current.

디지털 신호 프로세서 (DSP) analyzes the waveform in real time and separates:

Fundamental current
Harmonic current

단계 2: Calculate Compensation Current

The controller instantly determines the exact harmonic current generated by the nonlinear loads.

It calculates an equal current that is 180 degrees out of phase.

단계 3: Inject Opposite Harmonics

Using high-speed IGBT inverter technology, the Active Harmonic Filter injects the opposite harmonic current back into the electrical system.

These opposite currents cancel the unwanted harmonics.

결과는:

Original Harmonic + Opposite Harmonic = Nearly Zero Harmonic

This process occurs continuously in real time, allowing the filter to adapt immediately as load conditions change. Modern AHF systems can respond in less than 1 MS, making them ideal for rapidly changing industrial environments.

Benefits of Active Harmonic Filters

Installing an Active Harmonic Filter provides numerous advantages:

Significantly reduces Total Harmonic Distortion (thd)
Prevents transformer overheating
Protects capacitor banks
Extends motor lifespan
Reduces cable losses
Improves equipment reliability
Prevents nuisance trips
Meets IEEE 519 and IEC harmonic requirements
Increases overall system efficiency

AHFs are especially valuable in facilities with high concentrations of nonlinear loads such as manufacturing plants, 데이터 센터, 병원, 재생 가능한 에너지 설치.

How Static Var Generators Improve Power Factor

While Active Harmonic Filters remove waveform distortion, 정적 var 생성기 (SVG) focus on reactive power compensation.

SVGs are considered one of the most advanced technologies available for dynamic power factor correction.

단계 1: Monitor Reactive Power

Current transformers continuously measure the load current.

The DSP calculates:

유효전력
반응력
전력 계수

단계 2: Generate Opposite Reactive Current

Instead of switching capacitor banks on and off, SVGs use high-speed IGBT inverters.

They generate exactly the amount of reactive current required.

The SVG can either:

Supply capacitive reactive power
Absorb inductive reactive power

depending on system requirements.

단계 3: Maintain Target Power Factor

The SVG continuously adjusts its output to maintain the desired power factor.

Typical target values are:

0.95
0.98
0.99

기존 캐패시터 뱅크와는 다르게, SVGs provide stepless compensation from -1 에게 +1, avoiding both overcompensation and undercompensation. They also respond in less than 10 MS, making them suitable for rapidly fluctuating loads.

Benefits of Static Var Generators

A properly sized SVG can provide:

Power factor improvement up to 0.99
Lower utility penalty charges
Reduced reactive current
전압 안정성 향상
변압기 손실 감소
시스템 용량 증가
Better energy efficiency
Stable operation under rapidly changing loads

SVGs perform exceptionally well in industries such as:

철강 공장
채광
데이터 센터
재생에너지
Welding workshops
Port facilities
반도체 제조
수처리 식물

Active Harmonic Filter vs. 정적 var 생성기

특징	활성 고조파 필터 (AHF)	정적 var 생성기 (SVG)
기본 기능	Harmonic elimination	반응 전력 보상
Main Target	고조파 왜곡	역률이 좋지 않음
기술	IGBT inverter	IGBT inverter
응답 속도	<1 MS	<10 MS
Harmonic Reduction	훌륭한	Limited harmonic mitigation
전력 계수 보정	Good	훌륭한
전압 안정성	보통의	훌륭한
동적 보상	예	예
최고의 대상	VFD, UPS, 비선형 하중	Inductive and fluctuating loads

Why Many Facilities Need Both AHF and SVG

Many industrial customers assume that installing one device will solve every power quality issue.

실제로는:

Harmonics and reactive power often exist simultaneously.
Eliminating harmonics does not fully correct power factor.
Improving power factor does not eliminate harmonics.

Consider a modern manufacturing facility equipped with:

40 VFD
CNC 기계
Robotic welding systems
UPS 장치
압축기
Large induction motors

This facility is likely to experience:

High harmonic distortion
낮은 역률
전압 변동
3상 불균형

Installing only an SVG would improve power factor but leave harmonic distortion unresolved.

Installing only an AHF would reduce harmonics but might not eliminate utility penalties caused by low power factor.

Using both technologies together provides a comprehensive solution by simultaneously reducing Total Harmonic Distortion (thd), improving power factor to approximately 0.99, stabilizing voltage, lowering electrical losses, protecting equipment, and increasing overall system reliability. CoEpower’s AHF and SVG solutions are designed to work together seamlessly for demanding industrial applications.

일반적인 응용 분야

CoEpower Active Harmonic Filters and Static Var Generators are widely used in:

제조 공장
Automotive production
제철소
Cement factories
채굴 작업
기름 & 가스 시설
데이터 센터
병원
상업용 건물
재생 가능한 에너지 시스템
EV 충전소
Water and wastewater treatment plants
공항
Rail transportation
Marine and offshore platforms

결론

Power quality has become a critical factor in maintaining efficient, 믿을 수 있는, and cost-effective industrial operations. As facilities adopt more nonlinear loads and advanced automation, issues such as harmonics and poor power factor become increasingly common.

Active Harmonic Filters and Static Var Generators each address a different aspect of these challenges:

활성 고조파 필터 eliminate harmonic distortion by injecting equal and opposite harmonic currents, reducing THD and protecting electrical equipment.
정적 var 생성기 dynamically compensate for reactive power, 역률 개선, stabilizing voltage, and reducing utility penalties.

Rather than viewing AHF and SVG as competing technologies, they should be seen as complementary solutions. In many industrial environments, combining both provides the highest level of power quality, maximizing energy efficiency, 장비 수명 확장, and ensuring reliable operation.

~에 코퍼워, we leverage nearly two decades of expertise in power quality engineering to deliver tailored AHF and SVG solutions for industries worldwide. Whether your objective is harmonic suppression, 전력 계수 보정, or a complete power quality upgrade, our engineering team can help you design the optimal solution for your electrical system.

SEO Keyword Tags

활성 고조파 필터, AHF, 정적 var 생성기, SVG, 전력 계수 보정, 고조파 필터, 고조파 완화, Harmonic Elimination, 반응 전력 보상, 전력 품질 솔루션, 총 고조파 왜곡, THD 감소, 산업용 전력 품질, 전압 안정성, 동적 무효 전력 보상, IGBT Harmonic Filter, 역률 개선, 유효 전원 필터, 고조파 억제, 코퍼워, 공급 업체, 제조업체, 공장, 회사, 중국, 모조리, 구입하다, 가격, 인용, 대부분, 판매용, 회사, 재고, 비용.