基于扰动观测器的孤立交直流混合微电网双向AC/DC换流器电压波动控制策略研究
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摘要
针对孤立交直流混合微电网中双向AC/DC换流器在外界扰动下出现电压波动的问题,设计了一种应用于双向AC/DC换流器的母线电压扰动观测器,以实现在分布式电源出力和负荷功率变化等外界扰动情况下对系统扰动量的快速跟踪,且无需增加额外的电压或电流传感器,保证了交直流混合微电网内分布式电源和负荷的即插即用功能。进一步地提出了基于扰动观测器的孤立交直流混合微电网双向AC/DC换流器电压波动控制策略,以有效抑制暂态电压波动和冲击,提高了孤立混合微电网在不同扰动下的动态响应性能和鲁棒稳定性。在PSCAD/EMTDC平台上搭建了孤立交直流混合微电网仿真模型,通过在不同暂态过程下的仿真测试验证了所提方法的有效性和正确性。
In view of the voltage fluctuation problem of the bidirectional AC/DC converter in islanding AC and DC hybrid microgrid during external disturbance, a disturbance observer of the bus voltage of the bidirectional AC/DC converter is designed in this paper. With this observer, the system disturbance under the circumstance of external impact such as the abrupt change of distributed generation output and load power can be tracked quickly without additional voltage or current sensors, which ensures the plug and play function of the distributed generation and load in the hybrid microgrid. A voltage fluctuation control strategy of the bidirectional AC/DC converter based on the disturbance observer is proposed further to effectively suppress transient voltage fluctuation and impact, which can improve the dynamic response performance and robust stability of the islanding hybrid microgrid under different external disturbance. The simulation model of the islanding AC and DC hybrid microgrid is established in PSCAD/EMTDC to verify the validity and effectiveness of the proposed method with several transient process cases.
In view of the voltage fluctuation problem of the bidirectional AC/DC converter in islanding AC and DC hybrid microgrid during external disturbance, a disturbance observer of the bus voltage of the bidirectional AC/DC converter is designed in this paper. With this observer, the system disturbance under the circumstance of external impact such as the abrupt change of distributed generation output and load power can be tracked quickly without additional voltage or current sensors, which ensures the plug and play function of the distributed generation and load in the hybrid microgrid. A voltage fluctuation control strategy of the bidirectional AC/DC converter based on the disturbance observer is proposed further to effectively suppress transient voltage fluctuation and impact, which can improve the dynamic response performance and robust stability of the islanding hybrid microgrid under different external disturbance. The simulation model of the islanding AC and DC hybrid microgrid is established in PSCAD/EMTDC to verify the validity and effectiveness of the proposed method with several transient process cases.
引文
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[2]博伦?马斯H J,哈桑?范安.分布式发电接入电力系统[M].王政,译.北京:机械工业出版社,2015.
[3]张曦,张宁,龙飞,等.分布式电源接入配网对其静态电压稳定性影响多角度研究[J].电力系统保护与控制,2017,45(6):120-125.ZHANG Xi,ZHANG Ning,LONG Fei,et al.Research of the impacts on static voltage stability of distribution networks with distributed generation from different aspects[J].Power System Protection and Control,2017,45(6):120-125.
[4]米阳,吴彦伟,符杨,等.独立光储直流微电网分层协调控制[J].电力系统保护与控制,2017,45(8):37-45.MI Yang,WU Yanwei,FU Yang,et al.Hierarchical coordinated control of island DC microgrid with photovoltaic and storage system[J].Power System Protection and Control,2017,45(8):37-45.
[5]李霞林,郭力,王成山,等.直流微电网关键技术研究综述[J].中国电机工程学报,2016,36(1):2-17.LI Xialin,GUO Li,WANG Chengshan,et al.Key technologies of DC microgrids:an overview[J].Proceedings of the CSEE,2016,36(1):2-17.
[6]GUO W,MU L.Control principles of micro-source inverters used in microgrid[J].Protection and Control of Modern Power Systems,2016,1(1):56-62.DOI:10.1186/s41601-016-0019-8.
[7]周稳,戴瑜兴,毕大强,等.交直流混合微电网协同控制策略[J].电力自动化设备,2015,35(10):51-57.ZHOU Wen,DAI Yuxing,BI Daqiang,et al.Coordinative control strategy for hybrid AC-DCmicrogrid[J].Electric Power Automation Equipment,2015,35(10):51-57.
[8]陆晓楠,孙凯,GUERRERO J,等.适用于交直流混合微电网的直流分层控制系统[J].电工技术学报,2013,28(4):35-42.LU Xiaonan,SUN Kai,GUERRERO J,et al.DChierarchical control system for microgrid applications[J].Transactions of China Electrotechnical Society,2013,28(4):35-42.
[9]唐磊,曾成碧,苗虹,等.交直流混合微电网中AC/DC双向功率变流器的新控制策略[J].电力系统保护与控制,2013,41(14):13-18.TANG Lei,ZENG Chengbi,MIAO Hong,et al.One novel control strategy of the AC/DC bi-directional power converter in micro-grid[J].Power System Protection and Control,2013,41(14):13-18.
[10]毕大强,周稳,戴瑜兴,等.交直流混合微电网中储能变流器无缝切换策略[J].电力系统自动化,2016,40(10):84-89.BI Daqiang,ZHOU Wen,DAI Yuxing,et al.Control strategies of seamless switching for energy storage converter in hybrid AC/DC microgrid[J].Automation of Electric Power Systems,2016,40(10):84-89.
[11]祝钧,李瑞生,毋炳鑫,等.交直流混合微电网接口变换器虚拟同步发电机控制方法[J].电力系统保护与控制,2017,45(11):28-34.ZHU Jun,LI Ruisheng,WU Bingxin,et al.Virtual synchronous generator operation of interlinking converter between AC and DC microgrids[J].Power System Protection and Control,2017,45(11):28-34.
[12]陈智勇,罗安,陈燕东,等.逆变器并联的自适应滑模全局鲁棒电压控制方法[J].中国电机工程学报,2015,35(13):3272-3282.CHEN Zhiyong,LUO An,CHEN Yandong,et al.Adaptive siding-mode global robustness voltage control for islanded paralleled inverters[J].Proceedings of the CSEE,2015,35(13):3272-3282.
[13]蒋智化,刘连光,刘自发,等.直流配电网功率控制策略与电压波动研究[J].中国电机工程学报,2016,36(4):919-926.JIANG Zhihua,LIU Lianguang,LIU Zifa,et al.Research on power flow control and the voltage fluctuation characteristics of DC distribution networks based on different control strategies[J].Proceedings of the CSEE,2016,36(4):919-926.
[14]SATO A,NOGUCHI T.Voltage-source PWM rectifierinverter based on direct power control and its operation characteristics[J].IEEE Transactions on Power Electronics,2011,26(5):1559-1567.
[15]王成山,李霞林,郭力.基于功率平衡及时滞补偿相结合的双级式变流器协调控制[J].中国电机工程学报,2012,32(25):109-117.WANG Chengshan,LI Xialin,GUO Li.Coordinated control of two-stage power converters based on power balancing and time-delay compensation[J].Proceedings of the CSEE,2012,32(25):109-117.
[16]HOSSAIN M J,POTA H R,MAHMUD M A,et al.Robust control for power sharing in microgrids with low-inertia wind and PV generators[J].IEEE Transactions on Sustainable Energy,2014,6(3):1067-1077.
[17]YIN Z,DU C,LIU J,et al.Research on auto-disturbancerejection control of induction motors based on ant colony optimization algorithm[J].IEEE Transactions on Industrial Electronics,2018,65(4):3077-3094.
[18]WANG D,HE H,MU C,et al.Intelligent critic control with disturbance attenuation for affine dynamics including an application to a microgrid system[J].IEEETransactions on Industrial Electronics,2017,64(6):4935-4944.
[19]LOH P C,LI D,CHAI Y K,et al.Autonomous operation of hybrid microgrid with AC and DC subgrids[J].IEEETransactions on Power Electronics,2013,28(5):2214-2223.
[20]KIM W,SHIN D,WON D,et al.Disturbance observer based position tracking controller in the presence of biased sinusoidal disturbance for electrohydraulic actuators[J].IEEE Transactions on Control Systems Technology,2013,21(6):2290-2298.