电网故障条件下并网光伏逆变器控制策略研究

曹炜; 王海华; 陆冉; CAO Wei; WANG Haihua; LU Ran

doi:10.16513/j.cnki.10-1427/tk.2017.06.007

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分布式能源 ›› 2017, Vol. 2 ›› Issue (6) : 38-45. DOI: 10.16513/j.cnki.10-1427/tk.2017.06.007

电网故障条件下并网光伏逆变器控制策略研究

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Control Strategies of Grid-Connected Photovoltaic Inverter Under Grid Fault Conditions

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摘要

The effective control of photovoltaic inverter under grid faults is very important for the grid-connected operation of the photovoltaic generation system. This paper first analyzes the performance characteristics of grid-connected photovoltaic inverter under different grid faults, and proposes control strategies of grid-connected photovoltaic inverter under different grid faults. Aiming at symmetrical fault, limiting active power to constrain output current is adopted. Aiming at unsymmetrical fault, in order to expand active power, the approaches of PV inverter during unbalanced voltage sag, which are widely being researched at present, are analyzed, and two coordinated control strategies considering peak current and active and reactive power fluctuations are proposed, comparison and analysis of two coordinated control strategies have been made. Using the proposed control strategies, the low voltage ride-through (LVRT) of PV inverter has been realized to meet the requirements of grid code. The simulation models in PSCAD/EMTDC have been established to validate the proposed control strategy.

关键词

光伏逆变器 / 低电压穿越 / 协调控制策略 / 电流峰值 / 功率波动 / photovoltaic inverter / LVRT / coordinated control strategy / peak current / power fluctuation

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曹炜, 王海华, 陆冉, 等. Control Strategies of Grid-Connected Photovoltaic Inverter Under Grid Fault Conditions[J]. 分布式能源. 2017, 2(6): 38-45 https://doi.org/10.16513/j.cnki.10-1427/tk.2017.06.007

[J]. Distributed Energy Resources. 2017, 2(6): 38-45 https://doi.org/10.16513/j.cnki.10-1427/tk.2017.06.007

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