船舶并网逆变器无功补偿的协调控制策略
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摘要
为满足负载在实际船舶中的无功需求,研究在电网不平衡的情况下,船舶并网逆变器输出无功功率的控制方法。针对船舶并网逆变器在电网不平衡下瞬时功率输出存在二次波动问题,提出一种改变并网电流指令中负序基波分量比重的控制策略,实现并网逆变器瞬时功率与三相并网电流协调控制,有效改善电网三相不平衡问题。仿真试验结果表明:该协调控制策略能在保证电网电能质量的前提下,实现对船舶电网的无功补偿。
Taking the reactive power demand into consideration, methods for the shipborne grid-connected inverter to control the output reactive power are studied in the case of unbalanced power grid. A grid current-instantaneous power coordinated control strategy that adjusts the proportion of negative-sequence fundamental wave components is proposed to suppress the quadratic ripples of instantaneous power fluctuations. The control strategy also improves the three-phase balance effectively. Simulations verify the effectiveness of the strategy on achieving reactive power compensation while maintaining the power grid quality.
Taking the reactive power demand into consideration, methods for the shipborne grid-connected inverter to control the output reactive power are studied in the case of unbalanced power grid. A grid current-instantaneous power coordinated control strategy that adjusts the proportion of negative-sequence fundamental wave components is proposed to suppress the quadratic ripples of instantaneous power fluctuations. The control strategy also improves the three-phase balance effectively. Simulations verify the effectiveness of the strategy on achieving reactive power compensation while maintaining the power grid quality.
引文
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[3] ZHOU Z,LI T,TAKAHASHI T,et al.Design of a Universal Space Vector PWM Controller Based on FPGA[C]//19th Annual IEEE Applied Power Electronics Conference and Exposition-APEC 2004.New York:IEEE Press,2004:1698-1702.
[4] FARANDA R,LEVA S,MAUGERI V.MPPT Techniques for PV Systems:Energetic and Cost Comparison[C]//IEEE Power and Energy Society 2008 General Meeting:Conversion and Delivery of Electrical Energy in the 21st Century.New York:IEEE Press,2008:1-6.
[5] 李旷,刘进军,魏标,等.静止无功发生器补偿电网电压不平衡的控制及其优化方法[J].中国电机工程学报,2006,26(5):58-63.
[6] SHUAI Z,SHANGLIN M O,WANG J,et al.Droop Control Method for Load Share and Voltage Regulation in High-Voltage Microgrids[J].Journal of Modern Power Systems & Clean Energy,2016,4(1):76-86.
[7] 徐德鸿,陈治明,李永东,等.现代电力电子学[M].北京:机械工业出版社,2013.
[8] JOU H L,CHU H Y,WU J C.Novel Active Power Filter for Reactive Power Compensation and Harmonic Suppression[J].International Journal of Electronics,1993,75(3):577-587.
[9] BOJOI R I,LIMONGI L R,ROIU D,et al.Enhanced Power Quality Control Strategy for Single-Phase Inverters in Distributed Generation Systems[J].IEEE Transactions on Power Electronics,2011,26(3):798-806.
[10] 王正仕,陈辉明.具有无功和谐波补偿功能的并网逆变器设计[J].电力系统自动化,2007,31(13):67-71.
[11] 庞宇,刘宏达.一种适用于新能源船舶的多功能并网逆变器[J].船舶,2017(5):65-74.
[12] 陈道炼.DC-AC逆变技术及其应用[M].北京:机械工业出版社,2003.
[13] 陈燕东,罗安,彭自强,等.光伏并网发电与无功补偿的鲁棒预测控制[J].电工技术学报,2013,28(11):239-246.
[14] DING R,ZHANG J,MIN Y,et al.Design and Implementation of a New Kind of FC-TCR Controller Based on Multiprocessor and Digital Phase Shift Triggers[C]//Second International Conference on Power Electronics,Machines and Drives.London:IET Press,2004:181-185.
[15] 杨明.大型光伏电站逆变器并网控制策略及稳定性分析[D].重庆:重庆大学,2014.