Fuzzy-based control of on-load tap changers under high penetration of distributed generators

Abstract

Voltage regulation in the distribution networks becomes more challenging when the distribution generation (DG) units are introduced. The reasons behind that are: the reverse power flow which is introduced by the DG units, in addition to the probabilistic nature of the generated power due to renewable based DG units. In this paper, a fuzzy algorithm is proposed to provide an adaptive reference of the OLTC controller, such that the OLTC, which feeds a multiple feeders, can mitigate the effect of the high penetration of the DG units. The motivations behind using the fuzzy logic are: 1) it can map nonlinear relations behind its inputs and output; and 2) it can provide a smooth transition, which lead to a more relaxed tap operation compared to the conventional logic control. The proposed fuzzy algorithm is tested using a radial structure distribution network which is modeled using SIMULINKIMATLAB.

Photovoltaic penetration issues and impacts in distribution network – A review

“…The control strategy is proposed for voltage rise mitigation under high PV penetration while energy storage system is closed to each PV. Azzouz et al developed an adaptive fuzzy based OLTC control for high penetration of PV into distributed system to minimize the voltage rise [34]. The fuzzy algorithm can detect the highest and lowest voltage of the system to estimate the step change in the OLTC reference voltage.…”

On Coordinated Control of OLTC and Reactive Power Compensation for Voltage Regulation in Distribution Systems With Wind Power

“…The OLTC control approach, as presented above, is simpler compared to changing the voltage set point proposed in [5], [7], [9], [17] as the calculation of the voltage set point is not straight forward. In [7] fuzzy logic is used to calculate the reference voltage while References [5] and [9] have proposed to increase or decrease the voltage set point by a magnitude equal to the voltage deadband. In [17] PI controller is used for the calculation of the voltage set point.…”

Voltage and Reactive Power Optimization Using a Simplified Linear Equations at Distribution Networks with DG

“…Multiple line drop compensation (MLDC) is proposed to determine the optimum OLTC tap position by measuring each feeder current in a distribution system with DGs [11]. Fuzzy logic-based OLTC control is proposed for distribution systems with many DGs [12]. However, these studies do not consider the coordinated reactive power control of the interconnected DGs.…”