Abstract
The traditional repetitive controller has relatively worse stability and poor transient performance because it generates infinite gain at all the integer multiples of the fundamental frequency, and its control action is postponed by one fundamental period (T0). To improve these disadvantages, many repetitive controllers with reduced delay time have been proposed, which can selectively compensate the odd harmonics or 6k ± 1 harmonics with delay time reduced to T0/2 and T0/3, respectively. To further study in this area, this paper proposes an improved repetitive scheme implemented in a stationary reference frame, which only compensates the 6k + 1 harmonics (e.g., −5, +7, −11, +13) in three-phase systems and reduces the time delay to T0/6. Thus compared with the earlier reduced delay time repetitive controllers, the robustness and transient performance is further improved, the waste of control effort is reduced, and the possibility of amplifying and even injecting any harmonic noises into the system is avoided to a great extent. Moreover, the proposed repetitive scheme is used in the control of a three-phase hybrid active power filter. The experimental results validate the effectiveness of the proposed repetitive control scheme.
Highlights
Due to the widespread applications of distributed generations, adjustable speed drives, uncontrolled AC/DC rectifiers, and other nonlinear loads, the harmonic pollution in power systems is becoming increasingly more serious
This paper proposes a repetitive control scheme aimed at compensating the 6k + 1 harmonics implemented in a three-phase stationary reference frame with T0 /6 delay time in order that the transient performance is further improved
To minimize its own kilovolt ampere (KVA) rating, voltage source inverter (VSI) does not participate in reactive compensation, and the grid voltage is almost fully dropped on the capacitor in the LC filter
Summary
Due to the widespread applications of distributed generations, adjustable speed drives, uncontrolled AC/DC rectifiers, and other nonlinear loads, the harmonic pollution in power systems is becoming increasingly more serious. To improve the drawbacks above, and considering the fact that even harmonic components do not regularly appear in power systems, literature references [16,17] propose a repetitive control scheme aimed at compensating only the odd harmonics. This uses a negative feedback array instead of the usual positive feedback in the traditional repetitive controller. 6k − 1 harmonics (such as +5, −7, +11, −13) For this reason, this paper proposes a repetitive control scheme aimed at compensating the 6k + 1 harmonics implemented in a three-phase stationary reference frame with T0 /6 delay time in order that the transient performance is further improved. The experimental results validate the effectiveness of the 6k + 1 repetitive control scheme
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