Distributed Photovoltaic Hosting Capacity Evaluation for Distribution Networks Considering Medium-Voltage and Low-Voltage Interactions
DOI:
https://doi.org/10.13052/spee1048-5236.4533Keywords:
MV-LV interaction in distribution networks, distributed photovoltaics, hosting capacity, improved differential evolution non-dominated sorting whale optimization algorithmAbstract
Under the “Dual Carbon” goals background, large-scale integration of distributed photovoltaics (PV) is transforming distribution networks from passive radial systems into active bidirectional interactive systems. To address this, this paper proposes a hosting capacity assessment method for high-penetration distributed PV in distribution networks that considers medium and low voltage levels (MV-LV) interactions. First, by analyzing the impacts of MV-LV grid interactions, four core interaction mechanisms are identified: considering voltage coupling under low-voltage saturation, current coupling under short-circuit superposition, and power coupling under photovoltaic concentration. An MV-LV interaction model is constructed based on these mechanisms. Subsequently, the concept of a Voltage Deviation Index (VDI) is introduced to quantify the voltage quality level of the system. An assessment model is then formulated with the dual objectives of maximizing PV hosting capacity and minimizing VDI, incorporating system-wide constraints, MV-specific and LV-specific constraints, as well as MV-LV interaction constraints. Finally, a Differential Evolution Non-dominated Sorting Whale Optimization Algorithm (DE-NSWOA) is employed to solve. The effectiveness of the proposed method is validated through simulations based on a 10 kV distribution network in a city in East China, providing a foundation for subsequent research.
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