AHF Active Harmonic Filter Improves Power Quality in Seaport 2022 Sep.02

Many of the loads of ports and wharves are of repetitive short-time working system (frequent starting / braking, forward / reverse rotation, rising / falling of the Asynchronous motors). The load current, power and power factor change rapidly in a great amount. Therefore, it is required that the fast response of the reactive power compensation device, closely follow the reactive power demand of the load, and improve the power factor and stabilize the grid voltage. 


At the same time, with the development of power electronics technology, in recent years, thyristor powered DC system or AC-AC frequency conversion speed regulation system is widely used in the seaports. These electrical energy conversion devices and their electrical equipment are non-linear electrical equipment, which are typical harmonic sources. When this kind of equipment works, it not only absorbs a large amount of reactive power with impact to the power system, but also affects the voltage stability of the power grid. It also injects a great amount of harmonics into the power grid, which seriously affects the power quality . 


Therefore, in the power grid system of the seaport, effective measures must be taken to improve the power quality. The use of reactive power compensation and harmonic filtering devices can  improve the power factor and reduce harmonics in high efficiency, eliminate the pollution of the power grid, improve the power supply capacity of the power grid, and provide high-quality power for equipment.

 

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SFR-APF series active power filter cabinet is a new type of power electronic device used for dynamic harmonic filtering. It can filter harmonics (both in magnitude and frequency) in real time, so as to overcome the shortcomings of conventional harmonic filters(passive harmonic filter) in harmonic suppression and reactive power compensation, and realize the harmonic filtering function and reactive power compensation function of the system. It is especially suitable for occasions with high THDi, low power factor and great fluctuation of the load. It is widely used in seaports, metallurgy petroleum, chemical, industrial and mining enterprises, etc.


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Technical Features

 

Functionality

01 Harmonic filtering, reactive power compensation, harmonic and reactive power compensation, one machine for multiple purposes;

02 With harmonic sub order compensation function, and the target power factor can be set;

03 7”/10”high-definition HMI, the screen displays the system and device operating status in real time;

 

Comprehensive protection function to improve user application stability

01 The RMS peak double setting automatic current limiting algorithm, when the load harmonic current is greater than the equipment output, the equipment output can be automatically limited to 100% output, no overload risk;

02 Complete protection functions, with over-current, over-voltage, under-voltage, over-temperature and other protection functions, to ensure the safe and reliable operation of the system;

 

Advanced control strategy and topology design

01 The improved detection technology based on instantaneous reactive power theory, which can detect harmonic current in real time and automatically track load harmonic changes, has high controllability and fast response;

02 Adopts a unique phase splitting harmonic extraction algorithm, which can realize independent control of each phase when the load is three-phase unbalanced, and can optionally eliminate the unbalanced function when the capacity is sufficient;

03 LCL topology filtering is adopted. When harmonic current is output, high-frequency IGBT switching harmonic interference will not be introduced, and it is applicable to any on-site grid system impedance, without resonance;

 

Highly integrated, modular and serialized

01 Modular design, small size, light weight, high power density, easy installation and maintenance;

02 Combined parallel machine meets different capacity requirements, improves the reliability and maintainability of equipment while realizing standardized production, and greatly facilitates system installation and maintenance;

03 Single module independent air duct design can effectively isolate environmental dust adhesion and improve product heat dissipation efficiency.

 

Pictures from the site


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In the power grid system of the port area, effective measures are taken to improve the quality of the power grid and make it meet the standards. The use of reactive power compensation and harmonic treatment devices can effectively improve the power factor and control harmonics to meet the national standards, reduce harmonic pollution of the power grid, improve the power supply capacity of the power grid, and provide high-quality power for equipment. As your supplier of digital intelligent power distribution solutions, ELECNOVA has always been committed to achieving energy conservation and emission reduction, reducing costs and increasing efficiency for customers.


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