The Evolution of Power Quality Technology
Since the beginning of the electricity era, there have been a number of steps to reduce excess energy consumption, improve power quality and reduce operational losses in electrical installations. The introduction of computers and other switching loads such as frequency converters has made conventional compensation techniques not only obsolete but also a part of the problem.
Traditionally, power quality problems have been solved with inflexible solutions tailored to specific problems under certain conditions. The evolution in technology has gone from fixed-filter banks configured to match a specific installation, to step-wise semiconductor-controlled filter banks under automatic control.
Due to their relatively slow response times, these solutions only compensated for 60-80% of losses—at best.
Today - Highly Dynamic Processes
In today's industrial era, production is a highly dynamic process with a need for fast response time. Yesterday's power quality solutions all have limitations, which, in most cases, makes them more of a problem than a solution.
With the introduction of active filters such as ADF Power Tuning, the response time is down to microseconds, making it possible to handle even the most intricate loss creating behaviors in real time, and at a reasonable cost.
The ADF operational Principle
An ADF module is basically a very advanced computer controlled current generator with the ability to produce any shape or form of current with little or no delay.
A simplified diagram of the operating principle is shown in the figure here. Each module is connected in parallel, in shunt, with the load that requires compensation. The power flows of electrical currents between the load and the network are measured and analyzed [ 3 ] to determine if disturbances such as reactive displacement and/or harmonics are present.
If found, the ADF unit injects phase currents [ 2 ] that are the exact opposite of, for example, the harmonics and/or reactive displacement. This is done in order to cancel out the load behavior [ 1 ].
The result is an ideal load with a minimum of power losses and disturbances. The energy profile then appears ideal to the transformer.
ADF Power Tuning – The shape of power to come
ADF Active Harmonic Filter technology is the result of extensive research. It provides a unique way of saving energy in a vast range of applications such as industrial production machines and generator systems. It works by removing energy losses and correcting the electrical behavior in the time and frequency domains. This is achieved by using state-of-the-art signal processing and advanced control structures to manage the power flow to and from the machine with a power processor (power converter). Energy can even be stored intermediately in the ADF module, making it possible to deliver energy back to the electrical network (grid) in case of shorter power outages.