- 标题
- 摘要
- 关键词
- 实验方案
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Probabilistic Short-Circuit Current in Active Distribution Networks Considering Low Voltage Ride-Through of Photovoltaic Generation
摘要： The probabilistic short-circuit current (PSCC) of photovoltaic generation is determined by the voltage sag at the grid connection and the low voltage ride-through of the unit during the grid fault, while the voltage sag and the low voltage ride-through are both stochastic. According to short-circuit current characteristics and Thevenin equivalent circuit in the transient state, this paper analyzes the changing trajectory of the equivalent internal potential of photovoltaic generation during the period of low voltage ride-through. To deal with the uncertainty of low voltage ride-through, the probability density function by the maximum entropy method is used to characterize the stochastic process of low voltage disconnection of photovoltaic generation. Based on the fault information, the calculation method of PSCC in active distribution network considering the uncertainty of low voltage ride-through of photovoltaic generation is proposed. Two cases of 9-node and 34-node distribution network are used to verify the effectiveness of the method. The obtained PSCC results can reasonably re?ect the actual short-circuit current level of the active distribution network.
关键词： probabilistic short-circuit current,low voltage ride-through,active distribution network,Photovoltaic
更新于2025-09-11 14:15:04
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[IEEE 2018 China International Conference on Electricity Distribution (CICED) - Tianjin (2018.9.17-2018.9.19)] 2018 China International Conference on Electricity Distribution (CICED) - Calculation Method of Limit Access Capacity of Photovoltaic Source on the Basis of Chance-constrained Programming in Rural Distribution Network
摘要： To avoid the calculation of limit access capacity of photovoltaic (PV) source is incorrect due to the consideration of the occurrence of a small probability event, this paper proposes a method to calculate the limit access capacity of photovoltaic (PV) source based on the chance constraints of voltage deviation on the basis of considering the randomness of PV power and load. Maximizing limit access capacity of PV is regarded as the goal, the voltage deviation is regarded as the chance constrained condition, the calculation model of limit access capacity of PV is established. Then, using the LHS and Newton-Raphson to calculate the probabilistic load flow (PLF), the statistical properties of node voltage are obtained. Calculation results of PLF and quantum genetic algorithm are used to solve the model. By comparing the results of optimization with heuristic method, the correctness and validity of the proposed method are verified.
关键词： quantum genetic,rural distribution network,allowable capacity,Distributed photovoltaic generation,chance constrained programming
更新于2025-09-11 14:15:04
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[IEEE 2019 IEEE Innovative Smart Grid Technologies - Asia (ISGT Asia) - Chengdu, China (2019.5.21-2019.5.24)] 2019 IEEE Innovative Smart Grid Technologies - Asia (ISGT Asia) - Robust Reconfiguration of Distribution Network Considering the Access of Photovoltaic Electric Vehicle Charging Tower
摘要： The large-scale application of electric vehicles has led to an increase in the number of charging piles. Charging piles are gradually emerging as charging towers containing new energy sources. The charging load of electric vehicles has brought great uncertainty to the distribution network, and has brought impact to the operation of the distribution network. Considering the uncertainties of charging load of EV, a scene-based multi-period robust reconfiguration model is established in this paper. By defining new variables, the dual transformation process of conventional robust optimization is simplified, and the model is solved by CPLEX solver in GAMS platform. Finally, the effectiveness of the proposed method is verified by an IEEE-33 node example.
关键词： photovoltaic electric vehicle charging tower,second order cone,scenario,robust,distribution network reconfiguration
更新于2025-09-11 14:15:04
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[IEEE 2019 IEEE Innovative Smart Grid Technologies - Asia (ISGT Asia) - Chengdu, China (2019.5.21-2019.5.24)] 2019 IEEE Innovative Smart Grid Technologies - Asia (ISGT Asia) - Fault Analysis for Three Phase Unbalanced Distribution Network with Photovoltaic Generation Integration
摘要： Due to the asymmetry of three phase distribution network parameters, the traditional symmetrical method cannot meet the requirement for fault analysis. This paper aims to calculate the fault current of the unbalanced distribution network by employing the phase component modelling. A three-phase model of the unbalanced distribution network with photovoltaic generation system is proposed, considering the low voltage ride through control of photovoltaic generation system. A phase based iterative algorithm is explored to solve the three-phase voltage and short-circuit current. The impact of different connected locations and capacities of photovoltaic power generation on fault characteristics are analyzed.
关键词： unbalanced distribution network,fault calculation,low voltage ride through,photovoltaic generation system
更新于2025-09-11 14:15:04
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[IEEE 2018 IEEE Innovative Smart Grid Technologies - Asia (ISGT Asia) - Singapore (2018.5.22-2018.5.25)] 2018 IEEE Innovative Smart Grid Technologies - Asia (ISGT Asia) - Optimal Real-Time Scheduling of Energy Storage Systems to Accommodate PV Generation in Distribution Networks
摘要： The increasing penetration of renewables in the distribution networks (DN) can cause severe operation constraint violations, such as voltage violation and branch line overload. To deal with like photovoltaic (PV), a novel real-time scheduling (RTS) approach for energy storage systems (ESSs) in distribution networks is proposed in this paper. The distribution network operators (DNO) dispatch the PV, ESS and the substation together to minimized the weighted cost and ensure the security of system operation. The AC OPF in DN is formulated as a second-order cone programming (SOCP) problem where we can obain the global optimal solution using some off-the-shelf solvers. Case studies on 37-bus system demonstrate the effectiveness of the proposed approach as well as the exactness of the relaxation.
关键词： Active distribution network,photovoltaic,second-order cone programming,energy storage system
更新于2025-09-10 09:29:36
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[IEEE 2018 53rd International Universities Power Engineering Conference (UPEC) - Glasgow, United Kingdom (2018.9.4-2018.9.7)] 2018 53rd International Universities Power Engineering Conference (UPEC) - Manage Reverse Power Flow and Fault Current Level in LV Network with High Penetration of Small Scale Solar and Wind Power Generation
摘要： High penetration level of rooftop small-scale renewable energy generation (REG) such as solar and wind power into the existing low voltage (LV) network would cause the flow of power in reverse direction. This would also vary the level of short-circuit current required for relays to operate. Relay settings would be required to properly detect the unpredictable isolate the faulty section. This paper investigates the impact of residential distributed generation (DG) penetration level on the typical UK low voltage network protection system. Studies were commenced to properly charge and discharge the home connected energy storage battery (ESB). ESB is used as a remedial measure to confine the flow of reverse power due to rooftop DGs. Penetration level DGs are modeled based on proper ESB charging and discharging states in daily load cycle. Short circuit analysis results are compared with the UK passive network to investigate the impact of the DG on the short circuit currents at distribution transformer.
关键词： UK distribution network,short circuit analysis,Rooftop DG penetration,energy storage batteries,reverse power flow
更新于2025-09-04 15:30:14