[Show abstract][Hide abstract] ABSTRACT: A new current control scheme for selective harmonic compensation is proposed for shunt active power filters. The method employs an array of resonant current controllers, one for the fundamental, and one for each harmonic, implemented in fundamental reference frame in order to reduce the overall computational effort. The proposed controller design is based on the pole-zero cancellation technique, taking into account the load transfer function at each harmonic frequency. Two design methods are provided, which give controller transfer functions with superior frequency response. The complete current controller is realized as the superposition of all individual harmonic controllers. The frequency response of the entire closed loop control is optimal with respect to filtering objectives, i.e., the system provides good overall stability and excellent selectivity for interesting harmonics. This conclusion is supported by experimental results on a 7.6-kVA laboratory filter, indicating a reduction in current THD factor from 34% to 2%, while the highest harmonic compensated is the 37th harmonic current.
IEEE Transactions on Power Electronics 10/2007; · 5.73 Impact Factor
[Show abstract][Hide abstract] ABSTRACT: This paper proposes a new digital algorithm for the implementation
of the fixed-frequency adaptive hysteresis current control for
voltage-source inverters. The key features of the new algorithm are the
minimization of the analog external circuitry, the capability to
automatically compensate for the inverter deadtime effects without
appreciable delay and a tight synchronization of the inverter voltage
pulses with an external clock. The synchronization is actually inherent
in the implemented algorithm and does not require additional control
loops; the stability problems affecting all the solutions proposed so
far are, therefore, avoided and a steady switching frequency is
achieved. Even though the complexity of the algorithm is compatible with
many conventional microcontrollers' performance level, the
implementation with a commercial digital signal processor is considered
in order to achieve ultrasonic operating frequency and to test the
effectiveness of the solution in more demanding conditions
IEEE Transactions on Industry Applications 08/2000; · 2.05 Impact Factor
[Show abstract][Hide abstract] ABSTRACT: Current regulators for AC inverters are commonly categorized as hysteresis, linear PI, or deadbeat predictive regulators, with a further sub-classification into stationary ABC frame and synchronous d-q frame implementations. Synchronous frame regulators are generally accepted to have a better performance than stationary frame regulators, as they operate on DC quantities and hence can eliminate steady-state errors. This paper establishes a theoretical connection between these two classes of regulators and proposes a new type of stationary frame regulator, the P+Resonant regulator, which achieves the same transient and steady-state performance as a synchronous frame PI regulator. The new regulator is applicable to both single-phase and three phase inverters.
IEEE Transactions on Power Electronics 06/2003; · 5.73 Impact Factor
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