Abstract
This paper introduces a new control approach for the Multilevel Parallel Hybrid Active Power Filter (M-PHAPF) which can compensate harmonics and variable reactive power demand of loads by controlling the DC link voltage adaptively in medium voltage applications. By the means of this novel control method, M-PHAPF obtains a better and more efficient performance in the compensation of harmonics and reactive power compared to when using conventional control methods. The performance and stability of the proposed method are verified with a simulation model realized in PSCAD/EMTDC with different case studies. The simulation results demonstrate that harmonic compensation performance meets the requirements of the IEEE-519 standard.
Highlights
In power transmission/distribution systems, the intensive use of nonlinear loads causes several power quality problems
According to most articles in the literature, PHAPF has a reactive power compensation capability that is limited with the capacity of the used passive filter
The simulation results show that the active power filters (APF) part of Multilevel-PHAPF compensates nearly 15 kVAR reactive power with the adjusted DC link voltage which is nearly 1 kV
Summary
In power transmission/distribution systems, the intensive use of nonlinear loads causes several power quality problems. The main purpose of the development of HAPF topologies is to provide the compensation requirements of dominant harmonics and reactive power demand of nonlinear loads with passive filters and decrease the ratings and costs of APF. The most significant advantage of the PHAPF topology is that the passive filter capacitor holds the major part of fundamental voltage across its terminals and APF part holds only the required voltage for harmonic compensation on the DC link with the help of series connection of passive filters and inverters. This advantage provides reduction in power ratings and switching losses of APF
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