Active Harmonic Filter Case Study for Solar Power Plant in Vietnam
How CoEpower Reduced Harmonic Distortion in a 40.8 MW PV Plant and Achieved Full Grid Compliance
As utility-scale solar projects continue to expand worldwide, harmonic distortion in photovoltaic power plants has become an increasingly important issue for plant owners, EPC yüklenicileri, and grid operators. While PV systems provide clean energy, inverter-based generation can also introduce significant harmonic currents into the electrical network, creating risks for compliance, yeterlik, and long-term system stability.
In this project, CoEpower provided a customized Active Harmonic Filter (AHF) solution for a 40.8 MW grid-connected solar power plant in Vietnam. By applying source-level harmonic compensation at each inverter output, our engineering team successfully reduced the plant’s THDi from 6.1% ile 1.1% at the 115 kV grid connection point, ensuring full compliance with Vietnam’s power quality regulations.
This project clearly demonstrates how CoEpower Active Harmonic Filters for solar power plants can help renewable energy systems achieve better power quality, harmonic suppression, grid compatibility, and operational efficiency.
Proje Genel Bakış
This project was carried out at a grid-connected photovoltaic (Pv) power plant in Vietnam, located in the suburban area of Ho Chi Minh City. The plant uses a distributed inverter architecture, with all generated electricity exported to the national utility grid.
Project Snapshot
Industry: Solar Power / Yenilenebilir enerji
Başvuru: Harmonic mitigation for photovoltaic inverters
Proje Yeri: Vietnamese PV Plant
Kurulu Kapasite: 40.8 MW
Grid Connection Voltage: 115 kV
Solution Provided: İşbirliği yapmak Aktif harmonik filtre (AHF)
Device Model: CoEpo-AHF/3200-0.69-3L-DL
Main Goal: Reduce inverter-generated harmonics and meet local grid code requirements
For renewable energy projects like this, maintaining grid power quality compliance is essential—not only for smooth utility integration, but also for long-term equipment protection and revenue stability.
Customer Pain Points – Why Harmonic Control Was Critical
In many utility-scale solar plants, the electrical system is designed primarily around energy generation capacity. Fakat, once the plant begins exporting power to the grid, power quality issues often become a major operational concern.
That was exactly the challenge in this Vietnam PV project.
1. Harmonic Distortion from PV Inverters
The plant used multiple high-capacity inverters, and like most inverter-based systems, they generated harmonic currents due to high-frequency switching behavior. Proje verilerine göre, the 5th harmonic current was the dominant distortion component, with the 7th harmonic current also present.
Without proper harmonic filtering, these currents can spread through the electrical network and affect both plant equipment and the utility grid.
2. Risk of Grid Non-Compliance
Vietnam’s latest grid regulations impose strict harmonic current limits for power plants connected to the transmission and distribution system. For this project, the utility compliance assessment was based on the 115 kV grid connection point, where the following requirements had to be met:
Thdi / TDDi ≤ 3%
Individual harmonic distortion ≤ 2%
Fakat, before harmonic mitigation was applied, the plant’s measured THDi reached 6.1%, which was well above the acceptable threshold.
This meant the project faced a serious compliance issue.
3. Potential Equipment and Efficiency Losses
Excessive harmonic current in a solar power plant can lead to:
- Transformer overheating
- Increased line and cable losses
- Lower electrical efficiency
- Disturbance to protection relays and metering systems
- Reduced system reliability over time
For the customer, this was not just about meeting a regulatory target. It was also about ensuring the PV plant could operate safely, efficiently, and reliably over the long term.
CoEpower Solution – Source-Level Harmonic Mitigation for Solar Inverter Systems
After reviewing the plant’s electrical structure and harmonic profile, CoEpower engineers designed a distributed harmonic filtering solution based on local compensation at each inverter output.
Instead of trying to remove harmonics only at the upstream grid connection point, we targeted the distortion where it originated—directly at the inverter side.
CoEpower AHF Configuration
To address the harmonic issue effectively, CoEpower selected and deployed the following equipment:
Installed Harmonic Filtering Equipment
- Device Type: Aktif harmonik filtre (AHF)
- Brand: İşbirliği yapmak
- Model: CoEpo-AHF/3200-0.69-3L-DL
- Nominal Voltaj: 0.69 kV
- Değerlendirilmiş Akım: 100 A per unit
Deployment Quantity
- 2 AHF units per PV inverter
- 16 PV inverters total
- 32 CoEpower AHF units installed
This design was based on the plant’s inverter harmonic current profile and was specifically sized to ensure the site could achieve:
- THDi ≤ 3%
- Individual harmonic distortion ≤ 2% at the utility interconnection point
Results – THDi reduced from 6.1% ile 1.1%
The final project outcome showed a strong and measurable reduction in harmonic distortion across the entire PV plant.
Final Fine-Tuned Performance
After all 32 AHFs were fully activated, our engineers carried out final parameter optimization to improve response accuracy and maintain stability under solar output variation.
The final measured performance was:
- Average I1: 89.78 A
- Average I5: 0.294 A
- Average I7: 0.493 A
- Final THDi: 1.10%
- Final Compliance Status: Fully compliant
This result significantly exceeded the project target and provided the customer with a reliable compliance margin.
Why This Case Matters for Solar Power Developers
This project highlights a growing reality in the renewable energy sector:
Power Quality Is Now a Core Requirement for PV Projects
As grid codes become stricter, simply generating electricity is no longer enough. Utility-scale solar plants must also ensure:
- Harmonic compliance
- Stable inverter-grid interaction
- Low electrical losses
- Protection system compatibility
- Long-term grid acceptance
For EPCs, project developers, and plant owners, this means harmonic mitigation for solar power plants should be considered early in system design—not only after commissioning issues appear.
Why Choose CoEpower Active Harmonic Filters for Solar Plants?
CoEpower specializes in power quality solutions for photovoltaic systems, industrial plants, and utility-connected electrical infrastructure.
Our Active Harmonic Filter (AHF) solutions are designed to help customers solve real-world issues such as:
- Harmonic distortion from PV inverters
- Grid code non-compliance
- Transformer overheating
- Artan elektrik kayıpları
- Unstable power quality performance
Key Benefits of CoEpower AHF Solutions
- Fast and dynamic harmonic compensation
- Effective suppression of low-order harmonics
- Flexible deployment for distributed systems
- Improved power quality and system efficiency
- Proven performance in renewable energy applications
This Vietnam case is one more example of how CoEpower can deliver customized harmonic filtering solutions for modern solar energy systems.
Çözüm
In this Vietnam solar power project, CoEpower successfully helped the customer solve a critical harmonic distortion problem and achieve full utility compliance.
By implementing a source-level Active Harmonic Filter solution, we delivered:
- THDi reduction from 6.1% ile 1.1%
- Strong 5th and 7th harmonic suppression
- Improved transformer and line performance
- Stable operation across changing solar output
- Long-term support for efficient grid-connected PV operation
For solar developers and EPC contractors seeking a reliable way to improve power quality in photovoltaic power plants, CoEpower offers a proven, scalable solution.
Need an Active Harmonic Filter for Your Solar Power Plant?
If your photovoltaic project is facing issues such as:
- High THDi
- Inverter harmonic distortion
- Grid code compliance challenges
- Transformer overheating
- Utility interconnection concerns
CoEpower can help.
Contact CoEpower today to discuss a customized Active Harmonic Filter solution for your solar power plant, industrial power system, or utility-connected project.
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