Along with effectively cancelling harmonic distortions, EMES advanced active filters are capable of solving several other power quality challenges.
The selective operation mode allows tailoring of the functionality of the APF to meet the required performance level.
Customer Benefits includes:

• Higher productivity
• Reliable plant operation at reduced maintenance costs
• Longer lifetime of electrical and process equipment
• Additional electric capacity in existing electrical network
• Compliance with IEEE 519, G5/4, EN 50160 and also other power quality standards, recommendations and warranty demands.
• Clean up your power – Safe and stable power supply
• Provides best in class performance
• Energy savings
• Quick return on investment
• Harmonic mitigation eliminates harmonic current in the neutral, however, in a 3-phase system with single-phase loads, current still flows in the neutral. Applying mains load balancing reduces neutral current to 0, resulting in a perfectly stable system

Designed for high performance and reliability

We can proudly say that our products are designed and manufactured to the highest specifications using the proven IGBT (insulated-gate bipolar transistor) power switching semiconductors and digital signal processing hardware to secure high performance and accurate control.
By using state-of-the-art signal processing and advanced control structures to manage the power flow to and from the machine, EMES APF technology continuously monitors the network and injects the exact right amount of compensation current, at exactly the right time.

EMES Active Power Filters are built on modern three-level topology, which brings several major benefits compared to other active filters built on the conventional two-level topology. With three-level topology technology, the switching frequency and voltage stress are distributed among the two IGBTs. Reduced stress extends the lifetime of the power electronics. The efficiency and lower losses achieved with three-level topology are substantial. These improvements reduce the overall cost of ownership compared to conventional solutions.

The advanced 3 level topology design based on a zero level voltage transformation (comprising of IGBT’s of lower voltage corresponding higher switching frequency).
EMES APF`s are capable of suppressing the undesirably generated ripple currents effectively and promote a high compensation precision for the output waveform with respect to the sinusoidal waveform.

The compact E and H series APF range consists of a wide range of rack and wall mounted models.For installations with higher filtering capacity requirements, modules may be installed in a cabinet-type array, obtaining cabinets reaching 900A. In this way, far fewer measurement transformers and much less electrical wiring are required, since only 3 measurement transformers need to be connected to the master and the CAN bus wiring to the slave modules. In the event of an even higher filtering demand, the master-slave function can be expanded to unlimited parallel connected units.

Fans, pumps, compressors and other heavy loads in modern infrastructure are often fed with variable speed drives to control the motors to save energy. Harmonic distortions are significantly higher in the presence of variable speed drives and often exceed the
limits defined in global power quality standards and recommendations. EMES multi-functional active filter can effectively bring the harmonic distortions to the desired limits and help comply with the standards. Its best in-class harmonic mitigation improves reliability and extends equipment life while reducing operation and investment costs.

Examples on infrastructure applications:

• Water and waste water treatment plants
• District cooling plants
• Tunnels
• Metro stations
• Traction
• Wind & Solar farms 

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Guaranteed harmonic compliance for Vessels

It’s no secret that ships operate on weak grids with large dynamic loads. Common power quality problems for ships, harbor cranes, and marine vessels are reactive power, imbalances, flicker, and harmonics—which can cause power failures and damage sensitive equipment.

A unique challenge for the marine industry is meeting the class requirements that define strict rules regarding harmonics. This is complicated by the increased use of variable-frequency drives (VFD), which are commonly used to conserve energy, but, as a side effect, enhance harmonics. In the past, the common low harmonic solution has been to compensate large loads individually through the use of AFE drives or multipulse drives with a phase-shifting transformer, but these solutions are unnecessarily heavy and complicated.

Adverse effects of harmonics in Maritime environment :
„ Limitations on supply and network utilization
„ Increased transformer, motor and cable heating
„ Reduced equipment lifetime
„ Costly equipment downtime
„ Control system malfunctions
„ Pulsating and reduced motor torque
„ Audible noise

The key benefits of improving power quality in marine applications include:

Secure compliance
The EMES active filter product range has been certified according to most marine standards, such as DNV GL, ABS, and BV.
Additionally, these regulatory bodies mandate THD (total harmonic distortion) limitations for operating vessels. Non-compliance comes with heavy fines or even a demand to cease operations. The highly dynamic capabilities of EMES APF technology make this solution ideal for achieving THD limits.

Take advantage of standard six-pulse drives
EMES APF can be applied to the main bus bar. Because of this, all loads in the systems can use standard six-pulse drives. There is no longer a need for different types of expensive and complicated front end units.
Standard six-pulse drives are less expensive and easier to source and service—not to mention reliable. Combined with the modular structure of APF, we enable dependable redundancy.

Fuel savings
A typical MPSV (multi-purpose supply vessel) consumes about 4,500 – 7,000 tons of fuel per year. The efficiency of typical diesel electric propulsion indicates that about 5% in losses occur through the active front-end (AFE) drives or multi-pulse drives.

If APF is implemented, the losses of energy compared to AFE are 30%-40% lower. And with reduced energy demands comes decreased fuel consumption.

Double the mean time between failure of large drive functions
With APF, you can expect your MTBF (mean time between failures) to double. Unlike AFE (active front-end drives), APF Power Tuning is connected in parallel (in shunt) with the drive on the bus bar, making drive function completely unaffected even in the face of a filter failure.

Simple and effective harmonic mitigation
By applying a stack of filter modules on the main bus bar, we eliminate the need for THD compensation on individual drives. And the modular central filtering units keep the harmonics on the bus bar within class requirements.

Easy and effective retrofitting of drive equipment
A common problem when installing drives on an existing vessel is the increase in harmonics on the ship’s grid. This can be especially disruptive because the grid is often not sized for such changes in electrical loads. Additionally, there is often a space constraint, making it challenging to fit conventional low harmonic drives, particularly large AFE drives.

While the common solution to this issue has been to use AFE drives or multi-pulse transformers for large loads, with EMES APF, the filter is decoupled from the drives. This makes it possible to be placed anywhere and greatly simplifies installation, providing flexibility in decision-making and space-utilization. 

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Reliable and stable power quality is crucial for efficient operations and safety when it comes to land rigs, offshore drilling rigs, drill ships, and other oil and gas installations.

Offshore oil rigs require specialized energy-intensive equipment. This advanced machinery comes at a high capital investment and has high energy demands.

Minimizing oil and gas recovery costs while maintaining the highest standards of worker safety are two of the industry’s greatest challenges.

Similar to the shipping industry, offshore installations, land rigs, and Mobile Offshore Drilling Units (MODUs), etc. are mandated to meet requirements for total harmonic distortion (THD).

Harmonic compensation and other common issues

Offshore oil rigs require specialized energy-intensive equipment. This advanced machinery comes at a high capital investment and has high energy demands.

Minimizing oil and gas recovery costs while maintaining the highest standards of worker safety are two of the industry’s greatest challenges.

While AC drives increase precision, save energy and extend application lifetime, they also introduce harmonic currents to the on-board grid. If not kept under control, this can affect the performance and reliability of generators and other equipment and, ultimately, compromise safety. EMES offers harmonic mitigation solutions to comply with the regulations imposed by marine certification bodies, which state that harmonics must be kept to 5 or 8% total harmonic voltage distortion (THDv) on the main busbar.

The highly dynamic load character onboard modern offshore installations demand real time reactive power compensation to avoid voltage destabilization. Conventional power factor correction solutions are unable to answer to this demand in real-time. The new range of EMES multi-functional active filters are versatile solutions capable of providing several functionalities. They can inject fundamental reactive power in the network in real time, ensuring stable voltage. They can also be used to remove voltage unbalance in the network.

Adverse effects of harmonics in Offshore environment :
„ Limitations on supply and network utilization
„ Increased transformer, motor and cable heating
„ Reduced equipment lifetime
„ Costly equipment downtime
„ Control system malfunctions
„ Pulsating and reduced motor torque
„ Audible noise

The key benefits of improving power quality in marine applications include:

Secure Compliance
The EMES APF product range is certified according to most oil and gas standards, such as DNV GL, ABS, and BV.

Additionally, these governing bodies require THD (total harmonic distortion) limits for offshore oil and gas operations. Although it comes in a small, modular package, APF is strong enough to ensure you’ll meet the required standards for harmonic compensation.

The changing intensity onboard machines can lead to power surges, harmonics, or other problems that can trip alarms and shut down equipment. The capabilities of APF technology practically eliminate unnecessary trip alarms, so there is no need to waste time assessing false alarms typically triggered by poor power quality.

Extend equipment lifetime and efficiency
This reliable compensation solution ensures that unstable power is mitigated. This protects sensitive equipment and reduces the risk of equipment wear, expensive shutdowns, and replacement.

Reduce downtime and NPT (Non – Productive Time)
With high power quality, your equipment experiences extended lifetime.

With improved energy efficiency, you also optimize equipment functionality, minimize downtime, and reduce unplanned maintenance.

Save fuel
If APF is implemented, the losses of energy compared to AFE (Active Front End drives) are 30%-40% lower. And with reduced energy demands comes decreased fuel consumption.

Simple and centralized THD mitigation
By applying a stack of filter modules on the main bus bar, we eliminate the need for THD compensation on individual drives. And the modular central filtering units keep the harmonics on the bus bar within class requirements.

Stable and secure electric supply
Power for rigs is often produced by generators, which creates a weak, unstable electrical network. EMES APF technology works by actively compensating for these electrical disturbances, thereby improving the power quality and reliability of live and operational systems.

Space effective solutions
With limited space available onboard an offshore operation, you need to optimize the space you have. With its compact size and flexible installation options, APF will work with your existing infrastructure. 

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Water and waste water treatment plants are a key infrastructure element. Non-linear loads may affect their reliable operation. Non-linear loads in water treatment plants include variable frequency drives (VFDs), uninterrupted power supply (UPS), ozone generators, UV lights, computers and lighting. The process may be interrupted when harmonic current created by non-linear loads distorts the sine wave. The control circuitry of modern electrical equipment is designed for pure sinusoidal waveform. When operated under distorted waveform, repeated breakdown of sensitive electrical equipment will result in costly repairs. Critical loads in water and waste water treatment plants also require immunity against power outages and voltage sags.

Water and wastewater treatment involves the use of highly energy intensive processes that must be controlled with precision in order to maintain a safe and sanitary water supply.

Highly accurate, efficient and cost effective harmonic mitigation
One of the biggest challenges for the water and wastewater treatment industry is to save energy. Globally, water management accounts for 4% of all electricity consumption (International Energy Agency, 2014). The use of VSDs (variable speed drives) support water treatment plants in drastically reducing energy consumption, but they come with a cost. Although they help control the plant’s demanding processes, their use on fans, pumps, and other drives contribute to harmonics. When left uncompensated, harmonics have proven to cause problems such as overheating transformers, nuisance tripping, reducing equipment lifetime, etc.

Reduced downtime and increased redundancy
A chief concern in water treatment is the risk of contamination. These plants provide a critical function for societies around the world. And while this reliance is invisible when processes are working well, society definitely takes notice when something goes wrong. EMES APF helps prevent drastic problems such as equipment malfunction, unexplained interruptions, and unplanned stops.

Energy saving and increased efficiency
VSDs are crucial for running a water treatment plant, as well as reducing a plant’s energy consumption. APF enables the plant to run on VSDs without problems by essentially removing the problems that would hinder the VSDs from working their best.
And due to the ability to be installed in-parallel, APF technology enables lower energy losses than conventional compensation technology. 
For decades the common filter solution has been active front end (AFE), but there’s a modern solution that offers an improved competitive advantage. With active filter technology, you get a more compact solution that enables fewer losses and less total harmonic distortion (THD).The new EMES multi-functional APF is the most flexible and cost effective system available to help you achieve an LHD (Low Harmonic Drive).
APF can save you up to 40%* in total cost of ownership compared to AFE. It’s a versatile yet powerful solution that takes the hassle out of installation and operation.

Secure compliance
This low harmonic solution minimizes the effect that the facility’s heavy energy load will have on the grid—thereby helping you avoid fines or other legal repercussions due to non-compliance with electrical standards, such as IEEE, EN50160, FoL.

Prevent surges and transient with improved power quality – AVE Hybrid
By combining the AVE and the multi-functional E or H series active filters, the AVE-Hybrid is capable of controlling both
current and voltage, making it capable of addressing almost all known power quality related problems. The unit monitors and compensates imperfect power in the grid at the speed of the current to prevent power surges and transients that can damage monitoring or control systems in automated plants. Thanks to this active and dynamic monitoring, production can continue smoothly.

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Thanks to the device’s inbuilt, low-maintenance systems, the product’s service needs are kept to a minimum

The EMES APF range has a variety of systems to guarantee filter safety during operation:

• Protection system to prevent start-up if there is a problem
• Anti-resonance system: the device is designed to bypass specific frequencies where resonance is detected
• Smart thermal management system: fan speed and power regulation under high temperature conditions
• Safe mode activation in case of fault detection
• The device performs a self-test providing human-readable error and information messages. Problems in the installation can be quickly and directly detected by the APF. This makes the commissioning process fast, simple, safe and gives immediate results.

Maintaining a reliable supply free from resonance and instability is the biggest challenge for an active harmonic filter. The EMES APF utilize the very latest digital control technology and applies a unique Intelligent FFT (Fast Fourier Transform) algorithm where the APF analyses the current spectrum at 1024 individual points per cycle. The APF avoids resonance by effectively ‘learning’ each individual harmonic system impedance when first turned on.

Compensation current is slowly increased for each harmonic frequency with the APF constantly monitoring the stability of the network. Should resonance occur at any point on any harmonic then APF IFFT skips the problematic point. Even stable electrical systems change – loads change, impedance values change – so resonance points change too. APF constantly monitors for resonance and will avoid new resonance points as they occur.

Easy to Use Graphical User Interface
EMES APF come with advanced and comprehensive monitoring & reporting features. They enable before and after analysis by providing you with data of harmonic distortions from both supply and load side. The Easy to use high quality colour display allows the device to be configured and its installation status shown in real time.

In the APF monitoring system you can instantly view:

• The power quality levels of your system
• Your system status
• The overall performance of the system
• Power quality data
• Phase order
• Power levels
• Harmonic spectrum
• Waveforms
• System configuration
• Compensation configuration
• Alarm and event history
• Trigger events and warnings

Quick installation and easy step start-up.
The device just needs to be connected to the filter’s network and measurement transformers, configured using its touch screen and then started up. The device itself will check that start-up is safely carried out thanks to an internal self-diagnosis system.

Easy device configuration with clear, guided steps.
The harmonics to be filtered can be selected individually for optimum device operation

Rack and wall mounted modules
Can be equipped with 4,3″ high quality touch screen Easy to use, with displays on every unit
providing all system information including grid voltage, compensating current, grid current, load current, grid PF, load PF, alarm
code and operating status.

Cabinet based systems
Come complete with centralized 7” LED colour TFT touch screen. The HMI so you can see exactly what is happening with your complete system. In addition to the information available on the standard unit display you can view individual module temperatures, THDv, THDi, voltage waveforms, harmonic spectrum in real time.Information is displayed to the user in a very visual way by graphs and diagrams, so the behaviour of the installation and device may be instantly checked . The device also displays information for the 5 seconds prior to alarm activation to totally control installation status.

Optional
Remote access and wireless access point with integrated web server and 4G modem. (WiFi-4G-WAN-LAN)
Real-time, online, website monitoring of instantaneous values.
Data download without requiring any software.
Ethernet: TCP/IP, Modbus TCP.
Remote configuration and support of the device.

 Medium voltage applications

EMES have extensive knowledge from MV applications and with utilizing our standard units and industry-proven low voltage Active Filter with a step up transformer to create medium voltage solutions.  If applied correctly, an active technology is very compact and flexible enabling high availability. EMES multifunctional modular design offers a high degree of redundancy and availability as the modules can be operated individually.
Large industrial loads, such as arc furnaces, welding equipment, rolling mills, and large induction motors used in various industries, significantly affect the stability and operation of the power system by causing flicker, voltage unbalance, and harmonic distortion.
With the ultra-fast response time of less than one millisecond, EMES active units ensure superb compensation of reactive power and harmonic distortion even for rapid varying large loads. The compensation increases the plant’s productivity and removes damaging power quality challenges like flicker and harmonic distortion.

Application areas include:
• Steel industry (Electric Arc Furnaces – voltage stabilization reduces tap-to-tap  time and electrode consumption.)
• Mining and heavy industry – dynamic reactive power compensation stabilizes the power system, especially on large motor start-up,       ensuring a reliable power system.
• Shredders and crushers
• Welding (Shipyards)
• Cement plants
• Cranes
• Renewables markets like solar farms, wind farms, solar panel installations
• Regulating voltage and reactive power in transmission and distribution lines

Custom projects and Special Applications

EMES delivers customized solutions tailored by your needs.
Examples on such customization could be harsh environment adoptions like, high temperature, salt and humid environment and special IP or certification requirements.

We also have long experience with containerized solutions, and we can provide tailored systems with plug and play functionality with all necessary accessories and certifications. 

By combining the AVE and the multi-functional E or H series active filters, the AVE-Hybrid is capable of controlling both
current and voltage, making it capable of addressing almost all known power quality related problems
we see today and guarantees an optimal protection and power quality in your plant. The active filter part of the hybrid solution ensures an accurate and effective removal of system harmonics, load balancing, and a dynamic real time power factor compensation.
The AVE part reacts with the speed of the current, mitigates fast switch transients and protects the installation against voltage surges. The unit also reduces voltage dips and its effects together with ensuring a clean and stable ground reference, which again will reduce the risk of control system lockups.
The AVE – Hybrid gives longer equipment lifetime, higher process reliability, improved power system capacity and stability, and reduced energy losses, complying with most demanding power quality standards and grid codes.

E – Series – Multifunctional with cutting-edge performance
E-series multifunctional active filter gives you everything in a compact format. Although compact and cost-effective, the E-series  features cutting-edge performance including excellent and fully customizable harmonic mitigation capability. E-seires is the ideal active filter for small and medium size commercial and industrial loads. It is a powerhouse solution and the best choice for most applications because it is such a general purpose active filter.

• Real-time dynamic VAR compensation
• Excellent and fully customizable harmonic mitigation capability
• Load balancing
• Voltage control
• Neutral filtering capability 
• Ultra fast and accurate response
• Idle mode during low load (Standby)
• Non-over loadable
• Anti resonance protection and self diagnostic system
• Comprehensive monitoring system with high quality HMI
• Compact, modular and scalable design
  
• Wall-mounted, rack mounted and flexible cabinet solutions 

   

  Item	EMES E-Series APF
  	APF 25/35	APF 50/60	APF 75	APF 100	APF 150	APF 300
  System Parameters
  Nominal voltage	400 V
  Voltage range	228 ~ 456 VAC
  Nominal frequency	50/60 Hz  (Auto frequency sensing)
  Parallel Modules	Unlimited scalability – Unlimited parallel capacity -Load shared evenly between modules
  Efficiency	≥ 97 %
  System	3 Phase 4 wire/3 Phase 3 wire
  Current transformer	0 ~30,000/5
  Inverter topology	EMES Three level topology
  Performance Indicators
  Capacity	25/35 A	50/60 A	75 A	100 A	150 A	300 A
  Harmonic comp.	2nd to 50th, selectable
  Reactive power comp.	Dynamic real time compensation. Adjustable (-1) – 1
  Unbalance comp.	Three Phase Load Balancing, Adjustable 0-100%
  Harmonics Compensation Range	2nd ~ 50th order
  Harmonic Compensation Efficiency	> 97 %
  Fast response time	< 50 µs
  Overall response time	< 5 ms
  Target PF	-1 ~ 1 adjustment
  Control algorithm	Real time digital control, All harmonics, FFT, intelligent FFT and instantaneous reactive power
  Switching frequency	Average 20 kHz
  Cooling (Smart ventilation)	151 L/Sec	115 L/Sec	222 L/Sec	336 L/Sec	360 L/Sec	500 L/Sec
  Noise level	< 56 dB				< 65 dB	< 75 dB
  Monitoring
  Communication port	RS485 and Ethernet TCP IP port(RJ45) – Optional remote access package (Web-server – 4G-WAN-WiFi-LAN)
  Communication protocol	Modbus, TCP/IP
  Display interface	4.3-inch HMI(module), 7-inch HMI(central monitoring system), LED
  Safety features	Intelligent safety and protection system – Self diagnostic , anti-resonance system and Smart thermal management system
  Event and alarm history	Available
  Mechanical Characteristics
  Installation	Wall mounted / Rack mounted / Cabinet
  Rack mount, LED (W*D*H)	440*490*150	500*515*180	500*546*190	500*575*200	500*605*269	500*722*370
  Rack mount, LCD (W*D*H)	440*490*150	500*515*180	500*586*190	500*605*200	500*630*269	500*722*370
  Wall mount, LCD (W*D*H)	440*485*150	500*180*540	500*190*571	500*200*599	500*273*638	500*370*722
  Net Weight	18 kg	23 kg	28 kg	35 kg	44 kg	110 kg
  Colour	Black
  Environmental Requirements
  Altitude	≤ 1500 m
  Operation temperature	-10° ~ 40°C
  Relative humidity	5 % to 95 %, non-condensing
  Protection class	IP20, other IP class could be customized
  Qualifications	CE

EX – Series – unmatched efficiency and technology
One of the world’s fastest, flexible and most energy effective multifunctional active filters. The filter have an excellent harmonic mitigation capability along with a advanced real time dynamic reactive power compensation capability.  The EX series ultra-compact design and extreme low heat dissipation makes it suitable for space limited application and retrofit projects. The EX -series APF are designed for integration into our standard cabinets or to be used as a wall mounted or integrated stand-alone active filter.

Key Features:

• Ultra high – 98,5% efficiency
• Extreme low heat dissipation
• Real-time dynamic VAR compensation
• Excellent and fully customizable harmonic mitigation capability
• Load balancing
• Voltage control
• Neutral filtering capability 
• Ultra fast and accurate response
• Idle mode during low load (Standby)
• Non-over loadable
• Anti resonance protection and self diagnostic system
• Comprehensive monitoring system with high quality HMI
• Compact, modular and scalable design 

H-series – Demanding applications and harsh environments
H-series multifunctional active filters are customized for demanding applications and are available from voltage level up to 690V in both 3W and 4W applications. Equipped with state-of-the-art monitoring and reporting functionality, the robust H-series active filters operate in harsh environments and are easily scalable. H-series APF have UL-certificate of compliance.

Key Features:

• Real-time dynamic VAR compensation
• Excellent and fully customizable harmonic mitigation capability
• Load balancing
• Voltage control
• Neutral filtering capability 
• Voltage level up to 690V 
• Ultra fast and accurate response
• Idle mode during low load (Standby)
• Non-over loadable
• Anti resonance protection and self diagnostic system
• Comprehensive monitoring system with high quality HMI
• Wall-mounted, rack mounted and flexible cabinet solutions
• Compact, modular and scalable design