- 标题
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Short-term Voltage Stability Enhancement in Residential Grid with High Penetration of Rooftop PV units
摘要： Short-term voltage instability (STVI) imposes a severe threat to modern distribution networks (DNs) where a large number of intermittent distributed generator (DG) units, like rooftop photovoltaic (PV), is being integrated. Consequently, most of the international standards have been revised by incorporating the requirement of dynamic voltage support (DVS) through DG units, which is a promising approach to alleviate the STVI. In this paper, a novel DVS strategy is proposed to improve the short-term voltage stability (STVS) in residential grids. In comparison with other DVS strategies, the proposed DVS scheme maximizes the active power support from PV units following a contingency utilizing maximum allowable current of the PV inverters. Moreover, the inverter design margin is taken into account in designing the proposed scheme to limit the injected grid current within maximum allowable inverter current. The impact of inverter design margin on the STVS is explained, and the effectiveness of the proposed strategy compared with conventional DVS is demonstrated. The feasibility of the DVS control strategies in practical application is studied. Several case studies are carried out on benchmark IEEE 4 bus and IEEE 13 node test feeder systems, and finally on a ring-type DN. The results show that the proposed DVS scheme is feasible, and achieved superior performance compared to the other strategies. Furthermore, it has been shown that implementation of the proposed DVS scheme can avoid the installation of an expensive 1200 kVA D-STATCOM for STVS improvement in the target system.
关键词： Distributed generators,fault induced delayed voltage recovery,low voltage ride-through,dynamic voltage support,short-term voltage stability,distribution system
更新于2025-09-23 15:21:01
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[IEEE 2018 9th IEEE International Symposium on Power Electronics for Distributed Generation Systems (PEDG) - Charlotte, NC, USA (2018.6.25-2018.6.28)] 2018 9th IEEE International Symposium on Power Electronics for Distributed Generation Systems (PEDG) - State Space Model of Distributed PV System for Network Voltage Management
摘要： The increasing penetration of rooftop photovoltaics (PVs) into the low voltage (LV) network in recent years, poses new challenges for maintaining grid stability and voltage regulation. Recent network codes require PVs to participate in grid support services, especially voltage support. To study the dynamic interactions between PV systems and the LV distribution network within a reasonable simulation time, this paper derives a linear state-space model of a two-stage PV system operating at maximum power point (MPP) with reactive power support capability. The linear state-space model is verified against a detailed component-level PV system in MATLAB/ Simscape Power Systems?. It accurately captures all system dynamics for the small deviations expected in grid support service (GSS) operation and allows large dynamic simulations to be computed 2200 times faster than the full switching model.
关键词： voltage support,photovoltaic (PV) system,linear,State-space
更新于2025-09-09 09:28:46