HKK-APF Series Active Power Filter

Product Brochure

Shanghai Huakun Electric Co., Ltd.

1. Product Overview

The Active Power Filter (APF), also known as an active harmonic suppressor, is a new-generation intelligent power quality conditioning device independently developed by Shanghai Huakun Electric Co., Ltd. Integrated with advanced power electronic conversion technology and a high-speed DSP digital processing platform, this device provides dynamic grid harmonic suppression, precise stepless reactive power compensation and three-phase unbalance correction. It serves as an all-in-one solution to eliminate various power quality hazards in low-voltage distribution systems. All technical performance complies with national power quality standards, making it essential equipment for industrial, commercial and municipal power systems to optimize grid operation and ensure reliable power supply safety.

2. Core Operating Principle

The HKK-APF series adopts a full-digital closed-loop control architecture, consisting of two core modules: a reference current calculation unit and a compensation current generation unit, which ensures stable operation and millisecond-level rapid response. The working mechanism is standardized as follows:

1. Signal Acquisition: High-precision current transformers collect real-time operating current of power lines, convert analog signals into digital data, and transmit the data to the high-speed DSP main control chip for centralized processing.

2. Harmonic Analysis and Calculation: The self-developed high-precision harmonic decomposition algorithm accurately separates fundamental active current, harmonic current, reactive current, negative-sequence and zero-sequence unbalanced current, and extracts all harmful distortion current parameters of the grid.

3. Compensation Signal Output: According to the analyzed harmful current data, the system generates high-precision PWM pulse width modulation signals to drive imported high-performance IGBT/IPM power modules.

4. Grid Purification and Optimization: The equipment injects compensation current with equal amplitude and opposite phase to the grid harmonic and unbalanced current. It realizes dynamic elimination of harmonics, three-phase unbalance correction and reactive power compensation through current cancellation, restores standard sinusoidal grid waveforms, and stabilizes the overall operation of the distribution system.

3. Core Product Advantages

3.1 Full-Band Harmonic Suppression with Excellent Governance Performance

The product supports precise suppression of 2nd to 50th full-frequency grid harmonics and customizable targeted compensation for specific harmonic orders. Its harmonic elimination rate is over 95%, which can stably control the system total current distortion rate (THDi) within 5%. Equipped with an intelligent adaptive tracking algorithm, the device can real-timely monitor dynamic changes in load conditions and harmonic content. It responds instantly to load mutations and harmonic fluctuations, maintaining long-term grid power quality compliance, and is fully applicable to all power scenarios with non-linear loads such as frequency converters and rectifiers.

3.2 Integrated Three-Phase Unbalance Correction and Power Factor Optimization

Effectively solves three-phase current and voltage unbalance problems caused by harmonic interference and asymmetric load distribution. Within the rated capacity, the device accurately compensates fundamental negative-sequence and zero-sequence unbalanced components, and realizes dynamic reactive power compensation synchronously. It comprehensively optimizes common power quality problems including load unbalance, voltage deviation and low power factor, reduces operating loss of transformers and cables, and improves the overall operating efficiency of the distribution system.

3.3 Zero Resonance Risk with Superior Grid Compatibility

Different from traditional passive LC filters that are prone to series and parallel resonance with grid impedance and even amplify harmonic pollution, the HKK-APF series active power filter completely avoids grid resonance risks. It can also actively monitor and suppress inherent resonance hidden dangers of the power grid. The product operates stably in distribution systems with complex impedance and variable loads, with far higher grid adaptability and operational safety than traditional passive filtering equipment.

3.4 Full-Dimensional Intelligent Protection, Safe and Energy-Saving Operation

The device is equipped with comprehensive protection functions including overcurrent, overvoltage, undervoltage, overtemperature, sampling circuit fault, lightning surge and power module abnormality. It monitors the operating status of equipment and power grid in real time and automatically triggers protection mechanisms in case of faults to ensure the safety and stability of the entire power system. In addition, the built-in intelligent energy-saving strategy enables automatic sleep and shutdown under light-load grid conditions, effectively reducing no-load loss and improving the economic benefit of long-term operation.

3.5 Modular Humanized Design for Easy Installation and Maintenance

Featuring modular integrated design, the product is available in rack-mounted, wall-mounted and cabinet-mounted specifications, and supports multi-module parallel expansion to meet the power governance demands of different scenarios and capacities. The independent layered air duct heat dissipation structure provides excellent dust-proof and high-temperature resistance, adapting to harsh industrial operating environments. Equipped with a high-definition color touch screen, it visually displays real-time data such as grid harmonic parameters, power factor, three-phase current and equipment operating status. Standard communication interfaces support seamless connection with the distribution room background monitoring system, realizing remote viewing, parameter debugging and data traceability with high intelligent level.

4. Product Strengths and Limitations

4.1 Core Strengths

1. Dynamic Full-Range Governance: Real-time and thorough full-spectrum harmonic suppression, stable compensation effect free from grid impedance fluctuations, ensuring ultra-reliable operation.

2. High Grid Adaptability: Zero resonance risk, compatible with both new and old distribution systems, covering a wide range of application scenarios.

3. Multi-Functional Integration: Integrates harmonic suppression, three-phase unbalance correction and reactive power compensation in one unit, effectively improving grid power factor and reducing power consumption.

4. High Precision and Fast Response: Full-digital closed-loop control technology ensures millisecond-level response speed and high compensation accuracy for long-term stable operation.

5. Flexible and Space-Saving: Modular configuration supports convenient capacity expansion, with small floor space, suitable for workshops, machine rooms, commercial buildings and other scenarios.

4.2 Application Limitations

1. The equipment requires an external control power supply for operation, which is a standard design for all active intelligent power quality conditioning devices.

2. Power devices generate tiny high-frequency noise during operation. Professional built-in noise reduction circuits completely eliminate noise interference to the power grid and on-site equipment.

3. Compared with traditional passive filters, the initial investment cost is slightly higher. It is more suitable for industrial and high-end commercial projects with strict power quality standards and intensive non-linear loads.

5. Typical Application Scenarios

The HKK-APF series is applicable to all power systems with non-linear loads such as frequency converters, rectifiers, electric arc furnaces, UPS power supplies and EV charging piles, and is widely used in the following fields:

1. Industrial Manufacturing: Power distribution systems for petrochemical, electrolysis and electroplating, precision electronics, automobile manufacturing, water treatment, metallurgy and mining industries.

2. Commercial & Public Facilities: Power supply systems for large commercial complexes, high-end office buildings, medical institutions, airports, ports and other public buildings.

3. New Energy & Data Industry: IDC data centers, photovoltaic supporting distribution systems, new energy charging stations.

4. Municipal Power Engineering: Urban distribution substations, rail transit, smart industrial parks and other municipal power distribution projects.

6. Enterprise Profile

Shanghai Huakun Electric Co., Ltd. is a national high-tech enterprise and double software certified enterprise, specializing in the R&D, production, sales and service of power quality conditioning equipment for more than 20 years. The company has long-term in-depth industry-university-research cooperation with well-known domestic universities and electric power research institutes. Equipped with advanced automated production lines and professional precision testing equipment, all HKK-APF products undergo multiple strict factory inspections to ensure stable and reliable quality.

We have established a complete full-life-cycle service system, providing one-stop integrated solutions including on-site grid survey, customized scheme design, equipment supply, on-site installation and commissioning, and after-sales operation and maintenance. With high-quality products and professional technical services, we guarantee safe, stable and efficient operation of power grids for customers in all industries.

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