Abstract
This paper presents a simple yet efficient control method for active power filters that can be used to improve power quality. Applying this method can open the way towards limiting the hardware and computational expenditure, which are needed for control of the active filter, while maintaining its required performance. The method is based on the indirect approach of obtaining reference signals combined with the closed-loop current control technique. Monitoring of changes of energy stored in reactance elements of the active filter is the base for obtaining reference signals for compensation. The active filter can perform classical compensation and, additionally, can perform some extra functionality for managing of active power in the system. In particular, it can stabilize the supplying source power, enable energy exchange between loads connected on DC and AC sides of the active filter, and—in a case of generating loads—enable their energy storage and redistribution amongst consuming loads. The presented method can be useful for voltage-source as current-source inverter based active filters, and for DC systems as well as for AC single- or three-phase ones.
Highlights
This paper presents a simple yet efficient control method for active power filters that can be used to improve power quality
They are called active filters or compensators. They compensate for undesirable components of current and/or voltage waveforms of the supply source. Such compensation consists of generating these components by the active filter and forcing them through the supply sources, according to reference signals developed in real time
An interesting situation arises when this DC-side energy balancing ceases to be treated as an inconvenience of the indirect method. These changes in DC-side voltage may be used to obtain a reference signal that can be related to the active power existing in the source—active filter—load system, and, to the demanded active current of the source [32,33,36,37,38,39,40,41]
Summary
Controlled power electronic converters are widely used to improve power quality. The measurement and control module work out reference signals, which are used as the input information for the power processing module These references arise as a result of measurements of selected current and voltage waveforms after their transformation in accordance with a specific control algorithm. Frequency-domain algorithms used for finding nonactive current components are based on Fourier analysis Once these components are extracted from the measured signals, they are transformed back to time-domain reference signals. When considering the full spectrum of nonactive components of the total load power, the selective compensation enables to control the active filter strategy to operate without overstepping its maximum rated current [8,9,10]
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