基于全桥变流器的微电网功率平衡控制技术的研究
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摘要
独立微电网在海岛、偏远地区等应用逐渐广泛。然而,功率不平衡时常导致其电压与频率的波动,从而抑制了交流微电网的发展。针对此问题,文中提出一种基于全桥变流器的储能优化电路结构,以实现微电网功率平衡及其功率优化。该结构具有结构简单,控制简单,功率调节灵活的特点。全文首先对该工作结构、数学模型进行分析,建立了功率模型。其次,从电容的充放电和逆变的角度,分析全桥结构的有功和无功的功率控制技术,并采用一种多模式功率协调控制策略,对目标功率进行调节优化,降低直流侧电容电压,减少谐波含量。最后,通过仿真验证了该结构和控制策略的可行性。综上所述,该课题对未来交流微电网推广及其应用具有十分重要的意义。
Independent microgrid is widely used in islands and remote areas.However,power imbalance often leads to the fluctuation of voltage and frequency,which suppress the development of AC microgrid.In view of this problem,a kind of energy storage optimization circuit structure based on full-bridge converter is proposed so to achieve the power balance and its power optimization of the micro grid.The structure has such features as simple structure and control as well as flexible power adjustment.In this paper,the working structure and mathematical model are analyzed firstly and the power model is established.Secondly,the control technology of active and reactive power of the full bridge structure is analyzed from the point of view of charge/discharge and inverter of capacitance.A kind of multi-mode power coordinated control strategy is adopted to adjust and optimize the target power,reduce the capacitive voltage at DC side and reduce the harmonic contents.Finally,the feasibility of the structure and control strategy is verified by simulation.To sum up,this topic is of great significance to the future promotion and application of AC microgrid.
Independent microgrid is widely used in islands and remote areas.However,power imbalance often leads to the fluctuation of voltage and frequency,which suppress the development of AC microgrid.In view of this problem,a kind of energy storage optimization circuit structure based on full-bridge converter is proposed so to achieve the power balance and its power optimization of the micro grid.The structure has such features as simple structure and control as well as flexible power adjustment.In this paper,the working structure and mathematical model are analyzed firstly and the power model is established.Secondly,the control technology of active and reactive power of the full bridge structure is analyzed from the point of view of charge/discharge and inverter of capacitance.A kind of multi-mode power coordinated control strategy is adopted to adjust and optimize the target power,reduce the capacitive voltage at DC side and reduce the harmonic contents.Finally,the feasibility of the structure and control strategy is verified by simulation.To sum up,this topic is of great significance to the future promotion and application of AC microgrid.
引文
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[9]刘迎澍,王翠敏.光储微电网并网模式协调控制策略[J].电力系统及其自动化学报,2018,30(1):127-132.LIU Yingshu,WANG Cuimin. Coordinated control strategy for micro-grid with photovoltaic and energy storage units in grid connected operation[J]. Proceedings of the CSU-EPSA,2018,30(1):127-132.
[10]L SPASOJEVIC I P,BLA?IC B. Development of a control algorithm for a static var compensator used in industrial networks[J]. Journal of Power Electronics,2014,14(4):754-763.
[11]CHEN Yanglin,CHEN H J,CHEN Y M,et al. A stepping on-time adjustment method for interleaved multichannel PFC converters[J]. IEEE Transactions on Power Electronics,2015,30(3):1170-1176.
[12]Y WEI L K,CHENG M-m. A magnetic energy recovery switch based terminal voltage regulator for the three-phase self-excited induction generators in renewable energy systems[J].Journalof Power Electronics,2015,15(5):1305-1317.
[13]GARMABDARI R,MOGHIMI M,YANG F,et al. Battery energy storage capacity optimisation for grid-connected microgrids with distributed generators[C]//Universities Power Engineering Conference(AUPEC),2017 Australasian. IEEE,2017:1-6.
[2] GULTEKIN M. ERIS cascaded multilevel converter-based transmission STATCOM:system design methodology and development of a 12kV±12 mar power stage[J]. Power Electron,2013,28(11):4930-4950.
[3] SINGH B,SANA R,CHANDRA A,et al. Static synchronous compensators(STATCOM):a review[J]. IET Power Electronics,2009,2(4):297-324.
[4]高普杰.分布式光伏电源接入中低压农配网的电网规划研究[D].北京:华北电力大学,2017.
[5]胡伟,孙建军,姜一鸣,等.含STATCOM的孤岛微电网低频稳定性分析[J].中国电机工程学报,2015(10):2454-2462.HU Wei,SUN Jianjun,JIANG Yiming,et al. Low-frequency stabilization analysis of isolated micro-grid with STATCOM[J]. Proceedings of the CSEE,2015(10):2454-2462.
[6] T KAWAGUCHI T S,SHIMADA R. Off-shore wind farm con figuration using diode rectifier with MERS in current link topology[J]. IEEE Trans Electron,2013,60(7):2930-2937.
[7] CHEN Yanglin,CHEN H J,CHEN Y M,et al. A stepping on-time adjustment method for interleaved multichannel PFC converters[J]. IEEE Transactions on Power Electronics,2015,30(3):1170-1176.
[8]于芃,刘兴华,孙树敏,等.高可再生能源渗透率海岛微电网运行控制[J].电网技术,2018,42(03):779-788.YU Peng,LIU Xinghua,SUN Shumin,et al. Study on operation control of island microgrid with high enewable energy penetration[J]. Power System Technology,2018,42(3):779-788.
[9]刘迎澍,王翠敏.光储微电网并网模式协调控制策略[J].电力系统及其自动化学报,2018,30(1):127-132.LIU Yingshu,WANG Cuimin. Coordinated control strategy for micro-grid with photovoltaic and energy storage units in grid connected operation[J]. Proceedings of the CSU-EPSA,2018,30(1):127-132.
[10]L SPASOJEVIC I P,BLA?IC B. Development of a control algorithm for a static var compensator used in industrial networks[J]. Journal of Power Electronics,2014,14(4):754-763.
[11]CHEN Yanglin,CHEN H J,CHEN Y M,et al. A stepping on-time adjustment method for interleaved multichannel PFC converters[J]. IEEE Transactions on Power Electronics,2015,30(3):1170-1176.
[12]Y WEI L K,CHENG M-m. A magnetic energy recovery switch based terminal voltage regulator for the three-phase self-excited induction generators in renewable energy systems[J].Journalof Power Electronics,2015,15(5):1305-1317.
[13]GARMABDARI R,MOGHIMI M,YANG F,et al. Battery energy storage capacity optimisation for grid-connected microgrids with distributed generators[C]//Universities Power Engineering Conference(AUPEC),2017 Australasian. IEEE,2017:1-6.