Proportional-resonant controllers and filters for grid-connected voltage-source converters

Abstract

The recently introduced proportional-resonant (PR) controllers and filters, and their suitability for current/voltage control of grid-connected converters, are described. Using the PR controllers, the converter reference tracking performance can be enhanced and previously known shortcomings associated with conventional PI controllers can be alleviated. These shortcomings include steady-state errors in single-phase systems and the need for synchronous d-q transformation in three-phase systems. Based on similar control theory, PR filters can also be used for generating the harmonic command reference precisely in an active power filter, especially for single-phase systems, where d-q transformation theory is not directly applicable. Another advantage associated with the PR controllers and filters is the possibility of implementing selective harmonic compensation without requiring excessive computational resources. Given these advantages and the belief that PR control will find wide-ranging applications in grid-interfaced converters, PR control theory is revised in detail with a number of practical cases that have been implemented previously, described clearly to give a comprehensive reference on PR control and filtering.

A Novel Multi-Modular Series HVDC Tap

“…It is utilised for harmonic detection and elimination as well. The PR regulator is capable of following the AC reference at the certain frequency, eliminating the steady-state error and maintaining good transient response [14].…”

Investigate the Performance of Hierarchy Controller in Microgrid Application

“…While obtaining good power sharing, these control modules have been applied for parallel connection of inverters with UPS systems to evade mutual control wires [4]. With the subsequent correlation [16], this method composed of a power block computation that computes P and Q in the αβ-coordinates as, This virtual output impedance has negligible power losses contrary with physical impedance; moreover it is probable to execute resistance exclusive of efficiency losses.…”

Design and analysis of active power control strategies for distributed generation inverters under unbalanced grid faults

“…A detailed design for the PR controller and its application have been presented in [11,12]. Through optimising, the parameters used in the experiment are K p ¼ 2, K r ¼ 100 and v br ¼ 10 rad/s.…”

“…Alternatively, stationary frame resonant controllers are found to be suitable to control all the sequences (including the zero sequence that has been disregarded in many studies). This can simplify dual SRFs to a single stationary frame and achieve zero steady-sate error [10][11][12]. Also, symmetric sequence detection in feedback currents becomes unnecessary when using the resonant controllers, for example the scalar resonant control structure presented in [13].…”