Reference Current for the Grid-Connected Inverter to Support Grid Voltage
Li Jianwen1, Lei Yaxiong1, Li Yonggang1, Sun Wei2
1. State Key Laboratory of Alternate Electrical Power System with Renewable Energy SourcesNorth China Electric Power University Baoding 071003 China; 2. China Baoding Power Supply Company Baoding 071000 China
Abstract：In order to ride-through voltage sag and support grid voltage by injecting reactive current during grid faults, strategies that realize three-phase voltage balance, raise or eliminate active power fluctuations is proposed. At first, relationship between positive and negative sequence voltage components in αβ coordinate system and relationship between grid current and reactive power during unbalanced fault is analyzed. A parameter k is introduced to adjust proportion of positive and negative sequence components in reactive reference current. Expression of reference current and range of k when eliminating active power fluctuations is derived. Then maximum grid current is limited to ride through grid faults, meanwhile the grid-connected inverter is not off-grid. At last, voltage support, balance and elimination of active power fluctuation is realized in three-phase inverter with different reference current by using PR current control in stationary coordinate system.
李建文, 雷亚雄, 李永刚, 孙伟. 并网逆变器电压支撑的参考电流值[J]. 电工技术学报, 2015, 30(10): 276-282.
Li Jianwen, Lei Yaxiong, Li Yonggang, Sun Wei. Reference Current for the Grid-Connected Inverter to Support Grid Voltage. Transactions of China Electrotechnical Society, 2015, 30(10): 276-282.
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