Coordinated Control of Active and Reactive Power Compensation for Voltage Regulation with Enhanced Disturbance Rejection Using Repetitive Vector-Control

Abstract

Voltage profile is one of many aspects that affect power quality in low-voltage distribution feeders. Weak grids have a typically high line impedance which results in remarkable voltage drops. Distribution grids generally have a high R/X ratio, which makes voltage regulation with reactive power compensation less effective than in high-voltage grids. Moreover, these networks are more susceptible to unbalance and harmonic voltage disturbances. This paper proposes an enhanced coordinated control of active and reactive power injected in a distribution grid for voltage regulation. Voltage drop mitigation was evaluated with power injection based on local features, such loads and disturbances of each connection. In order to ensure disturbances rejection like harmonic components in the grid voltages, a repetitive vector-control scheme was used. The injection of coordinated active and reactive power with the proposed control algorithm was verified through simulations and experiments, demonstrating that it is a promising alternative for voltage regulation in weak and low-voltage networks subject to inherent harmonic distortion.

The Actual Exactness of a Fast RMS Correction during Abrupt Voltage Change

“…Among the suggested solutions, some are based on the usage of electrical storage [ 1 , 2 , 3 , 4 ], and some of them apply power flow dispatch at generating facilities [ 5 , 6 ]. Other solutions are based on the utilization of reactive power equipment [ 7 , 8 , 9 , 10 , 11 , 12 , 13 , 14 ]. Considering the influence of the high costs of high-voltage storage, reactive power usage as the voltage regulation model may be preferable among other methods.…”

Applying Directly Modified RDFT Method in Active Power Filter for the Power Quality Improvement of the Weak Power Grid

“…The weak power grid, such as the microgrid, remote rural network, and poorly regulated network, is an integral part of current and future power systems [1,2]. Compared with the ordinary distribution network, the weak power grid characterized by large grid impedance suffers from more severe power quality problems such as voltage and frequency fluctuation, harmonics, imbalance [3,4]. These power quality issues may cause a series of hazards such as the abnormal operation of the sensitive load, additional losses of the electric power equipment and the reduction of their service life, the decline of the power transmission efficiency, and interference in communication [5,6].…”