交直流混合微电网中双向变换器改进下垂控制研究
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摘要
提出1种利用直流侧功率量进行控制的交直流混合微电网双向变换器改进下垂控制策略,该控制策略能在整流、逆变、空闲模式自主平滑切换。改进下垂控制策略满足孤岛和并网2种运行模式,省去了多种控制策略切换。利用直流侧功率量控制避免了归一化运算,减少了由于直流母线电压和交流频率小范围波动引起的电力电子器件频繁动作。仿真结果表明,该控制策略可将直流母线电压和交流频率维持在额定值附近,保证交直流混合微电网稳定运行,提高系统可靠性。
The bidirectional converter in AC/DC hybrid microgrid is an important part for balancing the power between AC and DC, and its control mode is extremely important.Propose an improved droop control strategy for bidirectional converters using DC side power control. The control strategy can autonomously and smoothly switch among rectification, inversion, and idle mode. The improved control strategy is used to satisfy both the islanding and grid-connected modes of operation, eliminating multiple control switching.The DC side power amount control avoids the normalization operation and reduces the frequent operation of the power electronic device due to the small fluctuation of the DC bus voltage and the AC frequency. The simulation results show that the control strategy can maintain the DC bus voltage and AC frequency near the rated value, ensure the stable operation of the AC-DC hybrid microgrid, and improve system reliability.
The bidirectional converter in AC/DC hybrid microgrid is an important part for balancing the power between AC and DC, and its control mode is extremely important.Propose an improved droop control strategy for bidirectional converters using DC side power control. The control strategy can autonomously and smoothly switch among rectification, inversion, and idle mode. The improved control strategy is used to satisfy both the islanding and grid-connected modes of operation, eliminating multiple control switching.The DC side power amount control avoids the normalization operation and reduces the frequent operation of the power electronic device due to the small fluctuation of the DC bus voltage and the AC frequency. The simulation results show that the control strategy can maintain the DC bus voltage and AC frequency near the rated value, ensure the stable operation of the AC-DC hybrid microgrid, and improve system reliability.
引文
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[2]Wang P,Goel L,Liu X,et al.Harmonizing AC and DC:a hybrid AC/DC future grid solution[J].IEEE Power and Energy Magazine,2013,11(3):76-83.
[3]刘进军.电能系统未来发展趋势及其对电力电子技术的挑战[J].南方电网技术,2016,10(3):78-81.
[4]JAYAWARDENA A V,MEEGAHAPOLA L G,PERE-RA S,et al.Dynamic characteristics of a hybrid microgrid with inverter and non-inverter interfaced renew able energy sources:A case study[C]//2012 IEEE International Conference on Power System Technology.Auckland:IEEE,2012:1-6.
[5]Xialin Li,Li Guo,Yunwei Li,et al.A Unified Control for the DC-AC Interlinking Converters in Hybrid AC/DC Microgrids[J].IEEE Transactions on Smart Grid,2019,9(6):6540-6553.
[6]Loh P C,Li D,Chai Y K,et al.Hybrid AC-DC microgrids with energy storages and progressive energy flow tuning[J].IEEE Transactions on Power Electronics,2013,28(4):1533-1543.
[7]兰征,涂春鸣,肖凡,等.电力电子变压器对交直流混合微电网功率控制的研究[J].电工技术学报,2015,30(23):50-57.
[8]LOH P C,LI D,CHAI Y K,et al.Autonomous operation of hybrid microgrid with AC and DC subgrids[J].IEEE Transactionson onPower Electronics,2013,28(5):2214-2223.
[9]刘佳易,秦文萍,韩肖清,等.交直流双向功率变换器的改进下垂控制策略[J].电网技术,2014,38(2):304-310.
[10]谢文超,朱永强,杜少飞,等.交直流混合微电网中互联变流器功率控制[J].电力建设,2016,37(10):9-15.
[11]Chen D,Xu L.Autonomous DC voltage control of a DC microgrid with multiple slack terminals[J].IEEETransactions on Power Systems,2012,27(4):1897-1905.
[12]谢玲玲,时斌,华国玉,等.基于改进下垂控制的分布式电源并联运行技术[J].电网技术,2013,37(4):992-998.
[13]黄杏.微电网系统并/离网特性与控制策略研究[D].北京:北京交通大学,2013.