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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.
Highlights
Low-voltage (LV) distribution systems may suffer from the reduction of voltage amplitude, especially at points far away from the supply locations [1]
The converter was connected to a 127 V/60 Hz grid in series with a impedance (Zg ) formed by a 3.10 Ω resistor and a 3.80 mH inductor, that results in
The converter consists of a three-phase voltage source inverter (VSI) with a switching frequency of 18 kHz, with a second order output filter with 3.50 mH inductance and 5.0 μF capacitance for switching frequency ripple attenuation
Summary
Low-voltage (LV) distribution systems may suffer from the reduction of voltage amplitude, especially at points far away from the supply locations [1]. A significant voltage drop occurs when both the feeder and line impedance have high values and the drop voltages on these elements assume a considerable value in relation to the voltage delivered to the consumers. In such cases, the grid is called a weak grid [2]. Harmonic distortions become more apparent compared to the fundamental component This occurs primarily because line impedance is directly proportional to the frequency and the nonlinear current flowing through the branch produces non-fundamental frequency voltage drops
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