适用于微网的电压频率无偏差下垂控制方法
|
摘要
下垂控制是微网控制中常见的控制方法,但下垂控制会导致电压和频率偏差。针对上述问题,通过求取有功下垂和无功下垂控制方程的微分,在2个方程中分别加入频率和电压偏差的比例量,稳态时由于电压和频率偏差的微分为零,迫使频率和电压的偏差量为零,从而消除了稳态频率和电压偏差;此外还从减小频率和电压偏差的角度对比分析了传统下垂控制方法、相角下垂控制方法、自适应调节下垂系数控制方法以及所提方法的控制效果。仿真结果证明了前3种方法的局限性及所提方法的有效性。
Droop control is widely used in microgrid,while it leads to frequency and voltage deviation. Aiming at the abovementioned problem,the differentials of active power droop equation and reactive power droop equation were taken,and then proportional terms of frequency deviation and voltage deviation were added into these two equations.Because the differentials of voltage and frequency deviation in steady state were zero,the frequency deviation and voltage deviation were zero,so that frequency deviation and voltage deviation were eliminated. Besides,the performance of conventional droop control,power angle droop control,control strategy based on drooping coefficient adjustment,and the proposed method were analysed in terms of reducing frequency and voltage deviation. The simulation manifests the limitation of the former three methods and confirms the effectiveness of the method proposed.
Droop control is widely used in microgrid,while it leads to frequency and voltage deviation. Aiming at the abovementioned problem,the differentials of active power droop equation and reactive power droop equation were taken,and then proportional terms of frequency deviation and voltage deviation were added into these two equations.Because the differentials of voltage and frequency deviation in steady state were zero,the frequency deviation and voltage deviation were zero,so that frequency deviation and voltage deviation were eliminated. Besides,the performance of conventional droop control,power angle droop control,control strategy based on drooping coefficient adjustment,and the proposed method were analysed in terms of reducing frequency and voltage deviation. The simulation manifests the limitation of the former three methods and confirms the effectiveness of the method proposed.
引文
[1]Lasseter R H,Eto J H,Schenkman B,et al.CERTS Microgrid Laboratory Test Bed[J].IEEE Transactions on Power Delivery,2011,26(1):325-332.
[2]牟晓春,毕大强,任先文.低压微网综合控制策略设计[J].电力系统自动化,2010,34(19):91-96.
[3]Karel De Brabandere,Bruno Bolsens,Jeroen Van den Keybus,et al.A Voltage and Frequency Droop Control Method for Parallel Inverters[J].IEEE Trans on Power Electronics,2007,22(4):1107-1115.
[4]张国荣,谢洁.用于微网逆变器并联的控制策略[J].电测与仪表,2014,51(12):60-64.
[5]郭倩,林燎源,武宏彦,等.考虑自适应虚拟阻抗的微电网分布式功率控制策略[J].电力系统自动化,2016,40(9):23-29.
[6]袁敞,丛诗学,徐衍会.应用于微电网的并网逆变器虚拟阻抗控制技术综述[J].电力系统保护与控制,2017,45(9):144-154.
[7]Majumder R,Chaudhuri B,Ghosh A,et al.Improvement of Stability and Load Sharing in an Autonomous Microgrid Using Supplementary Droop Control Loop[J].IEEE Transactions on Power Systems,2010,25(2):796-808.
[8]张明锐,杜志超,黎娜,等.高压微网孤岛运行时频率稳定控制策略研究[J].中国电机工程学报,2012,32(25):20-26.
[9]董亮,张尧,马皓,等.微电网无互联先逆变器并联系统新型相位调节法[J].电力系统自动化,2012,36(2):52-57.
[10]韩华,刘尧,孙尧,等.一种微电网无功均分的改进控制策略[J].中国电机工程学报,2014,34(16):2639-2648.
[11]郑永伟,陈民铀,李闯,等.自适应调节下垂系数的微电网控制策略[J].电力系统自动化,2013,37(7):6-11.
[2]牟晓春,毕大强,任先文.低压微网综合控制策略设计[J].电力系统自动化,2010,34(19):91-96.
[3]Karel De Brabandere,Bruno Bolsens,Jeroen Van den Keybus,et al.A Voltage and Frequency Droop Control Method for Parallel Inverters[J].IEEE Trans on Power Electronics,2007,22(4):1107-1115.
[4]张国荣,谢洁.用于微网逆变器并联的控制策略[J].电测与仪表,2014,51(12):60-64.
[5]郭倩,林燎源,武宏彦,等.考虑自适应虚拟阻抗的微电网分布式功率控制策略[J].电力系统自动化,2016,40(9):23-29.
[6]袁敞,丛诗学,徐衍会.应用于微电网的并网逆变器虚拟阻抗控制技术综述[J].电力系统保护与控制,2017,45(9):144-154.
[7]Majumder R,Chaudhuri B,Ghosh A,et al.Improvement of Stability and Load Sharing in an Autonomous Microgrid Using Supplementary Droop Control Loop[J].IEEE Transactions on Power Systems,2010,25(2):796-808.
[8]张明锐,杜志超,黎娜,等.高压微网孤岛运行时频率稳定控制策略研究[J].中国电机工程学报,2012,32(25):20-26.
[9]董亮,张尧,马皓,等.微电网无互联先逆变器并联系统新型相位调节法[J].电力系统自动化,2012,36(2):52-57.
[10]韩华,刘尧,孙尧,等.一种微电网无功均分的改进控制策略[J].中国电机工程学报,2014,34(16):2639-2648.
[11]郑永伟,陈民铀,李闯,等.自适应调节下垂系数的微电网控制策略[J].电力系统自动化,2013,37(7):6-11.