Abstract
This paper presents a methodology for evaluating the techo-economic feasibility of mixed AC and DC distribution network to replace the existing AC distribution network with large-scale integration of photovoltaic energy sources. Economic dispatch of mixed AC/DC system is formulated in the presence of power electronic transformer (PET) for the flexible control of AC and DC power flows while maintaining the reliability constraints in terms of bus voltage, branch current carrying capacity, and the efficient operation of power electronic converters. Furthermore, the configuration of the PET and power losses of converters with a changing operation efficiency is incorporated into the optimal dispatch problem to assess the energy savings provided by the AC/DC power network. Two objectives for minimizing the operating cost and total power losses are also considered in the formulated economic dispatch. To obtain the Pareto-optimal solutions of this reliability constrained multi-objective optimization problem, the non-dominated sorting genetic algorithm-II (NSGA-II) associated with the interior-point method are applied in the proposed two-stage optimal algorithm to solve the optimization for PET configuration and operation. The method has been tested on the IEEE 33-bus radial distribution system with excessive PV installation and updated PETs. In comparison with the optimal dispatch of existing AC power distribution system, the joint optimization of PET AC/DC ports and PV inverters improves the flexibility of power flow control for both AC and DC networks and thus minimizing the PV curtailment and total operating cost.
Highlights
Mixed alternating current (AC) and direct current (DC) power distribution has been considered an alternative to the conventional distribution system where AC power transformer is installed at each bus to supply the low-voltage (LV) customers
This paper presented a techno-economic evaluation of mixed AC and DC power distribution network with high penetration of PV generation
Simulation results are generated for Pareto solutions of three different types of control strategies applied to power electronic transformer (PET) and PV inverters in the multi-objective optimal dispatch for both AC and DC power flows
Summary
Mixed alternating current (AC) and direct current (DC) power distribution has been considered an alternative to the conventional distribution system where AC power transformer is installed at each bus to supply the low-voltage (LV) customers. Other studies on the economic dispatch of power system estimated operating cost by considering only power losses of AC distribution network and peak converter efficiencies It includes a technical analysis on the topology and control of power electronic converters in PET and PV generation to identify the control variables and the boundaries for the optimization model of the AC/DC power networks. It follows the model of reliability constrained economic dispatch of power system using PET and PV inverters as the control variables for techo-economic analysis of mixed AC/DC power networks versus conventional power distribution system It addresses the combined control of AC and DC power flows based on multi-port PET and includes a variable efficiency function for different loading conditions of power converters in the time-series simulation of power system.
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