Abstract
The use of photovoltaic reactive power and energy storage active power can solve the problems of voltage violation, network loss, and three-phase unbalance caused by photovoltaic connection to low-voltage distribution networks. However, the three-phase four-wire structure of the low-voltage distribution network brings difficulties to power flow calculation. In order to achieve photovoltaic utilization through optimal power flow, a photovoltaic-energy storage collaborative control method for low-voltage distribution networks based on the optimal power flow of a three-phase four-wire system is proposed. Considering the amplitude and phase angle of voltage and current, a three-phase four-wire node admittance matrix was used to establish the network topology of the low-voltage distribution network. Also, to minimize the network loss, the three-phase unbalance and voltage deviation. a multi-objective optimization model based on three-phase four-wire network topology was established considering the voltage constraints, reverse power flow constraints and neutral line current constraints. Through improving the node admittance matrix and model convexity, the complexity of solving the problem is reduced. The CPLEX algorithm package was used to solve the problem. Based on a 21-bus three-phase four-wire low-voltage distribution network, a 24-h multi-period simulation was undertaken to verify the feasibility and effectiveness of the proposed scheme.
Highlights
In recent years, with the rapid development of economy, environmental pollution and the energy crisis are being increasingly prominent
Solution Method Based on Optimal Power Flow Model in a Three-phase Four-Wire System
The problems of large-scale domestic photovoltaic connecting to the three-phase four-wire low-voltage distribution network including voltage violation and three-phase unbalance were studied
Summary
With the rapid development of economy, environmental pollution and the energy crisis are being increasingly prominent. In order to achieve the sustainable energy development, photovoltaic and other renewable energy power generation has been vigorously promoted (Zehar and Sayah, 2008). Large-scale household photovoltaic integration will affect the node voltage and network losses of the three-phase four-wire structure of the low-voltage distribution network. The mismatch between household photovoltaic generation and household loads causes the violation of the upper voltage limit during the day and the lower limit in the evening (Aziz and Ketjoy, 2017). The three-phase four-wire structure of the low-voltage distribution network will lead to three-phase unbalances if there are three-phase loads and asymmetric line. It is significant to research on the photovoltaic utilization for a threephase four-wire system of the low-voltage distribution network
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