串联直流升压型光伏电站经VSC-HVDC并网控制策略研究
|
摘要
提出一种大型光伏电站直流并网方案,该方案通过大功率高变比的有源箝位Boost全桥隔离变换器(Boostfull bridge isolated converter,BFBIC)串联升压,然后经柔性直流输电(voltage source converter-high voltage directcurrent,VSC-HVDC)实现光伏高压直流并网。研究该系统的协调运行控制策略及运行特性,并针对光伏电站内串联光伏发电升压模块间电压严重不均所造成的过电压问题,提出一种过压控制策略。该控制策略对光伏电站的最大功率点跟踪(maximum power point tracking,MPPT)进行动态切换,并将其与电压源换流器(voltage sourceconverter,VSC)的功率差额斜率控制策略协调配合。在Matlab/Simulink压经VSC-HVDC并网系统模型,仿真结果验证所提拓扑方案的正确性,以及过压控制策略的可行性。
A DC integration scheme for large-scale solar power plants is proposed. The proposed scheme steps up voltage by connecting the power plants in series with a high power high transformation ratio boost full bridge isolated converter (BFBIC),then realizes solar power plants HVDC integration by a connection with voltage source converter-high voltage direct current(VSC-HVDC). Coordinate operational control strategy and operation characteristics of the proposed DC integration system are studied. Aiming at the overvoltage phenomenon caused by serious voltage distribution unbalance among step-up modules in the solar power plant,an overvoltage control strategy is presented. The control strategy dynamic switches regulation of solar power plant maximum power point tracking(MPPT),and combines the dynamic switching with power difference gradient control strategy of the voltage source converter(VSC). A simulation model of a 4 MW/±30 kV series-type DC step-up VSC-HVDC integration system for solar power plants is established in Matlab/Simulink,validity of the proposed DC integration topology and feasibility of the overvoltage control strategy are verified by the simulation results.
A DC integration scheme for large-scale solar power plants is proposed. The proposed scheme steps up voltage by connecting the power plants in series with a high power high transformation ratio boost full bridge isolated converter (BFBIC),then realizes solar power plants HVDC integration by a connection with voltage source converter-high voltage direct current(VSC-HVDC). Coordinate operational control strategy and operation characteristics of the proposed DC integration system are studied. Aiming at the overvoltage phenomenon caused by serious voltage distribution unbalance among step-up modules in the solar power plant,an overvoltage control strategy is presented. The control strategy dynamic switches regulation of solar power plant maximum power point tracking(MPPT),and combines the dynamic switching with power difference gradient control strategy of the voltage source converter(VSC). A simulation model of a 4 MW/±30 kV series-type DC step-up VSC-HVDC integration system for solar power plants is established in Matlab/Simulink,validity of the proposed DC integration topology and feasibility of the overvoltage control strategy are verified by the simulation results.
引文
[1]胡斌,娄素华,李海英,等.考虑大规模光伏电站接入的电力系统旋转备用需求评估[J].电力系统自动化,2015,39(18):15—19.[1] Hu Bin,Lou Suhua,Li Haiying,et al. Spinning reservedemand estimation in power sysytems integrated withlarge-scale photovoltaic power plants[J]. Automation ofElectric Power Systems,2015,39(18):15—19.
[2]丁明,王伟胜,王秀丽,等.大规模光伏发电对电力系统影响综述[J].中国电机工程学报,2014,34(1):2—14.[2] Ding Ming,Wang Weisheng,Wang Xiuli,et al. Areview on the effect of large-scale PV generation onpower systems[J]. Proceedings of the CSEE,2014,34(1):2—14.
[3] Han Xiaonan,Ai Xin,Sun Yingyun. Research on large-scale dispatchable grid-connected PV systems[J].Journal of Modern Power Systems and Clean Energy,2014,2(1):69—76.
[4]赵争鸣,雷一,贺凡波,等.大容量并网光伏电站技术综述[J].电力系统自动化,2011,35(12):101—107.[4] Zhao Zhengming,Lei Yi,He Fanbo,et al. Overview oflarge-scale grid-connected photovoltaic power plants[J].Automation of Electric Power Systems,2011,35(12):101—107.
[5] Tamimi B,Ca?izares C,Bhattacharya K. Modeling andperformance analysis of large solar photo-voltaicgeneration on voltage stability and inter-area oscillations[A]. IEEE Power and Energy Society General Meeting[C],Detroit,Michigan,USA,2011.
[6]许洪华.中国光伏发电技术发展研究[J].电网技术,2007,31(20):77—81.[6] Xu Honghua. The study on development of PVtechnology in China[J]. Power System Technology,2007,31(20):77—81.
[7]王常骐,郭家虎.风电场直流并网的拓扑结构研究[J].电网技术,2014,38(11):3065—3070.[7] Wang Changqi,Guo Jiahu. Research on topologicalstructures for dc grid-connection of wind farm[J]. PowerSystem Technology,2014,38(11):3065—3070.
[8]张新燕,赵理威,赵理飞,等.新能源多馈入直流并网与传统交流并网对比[J].高电压技术,2017,43(4):1121—1128.[8] Zhang Xinyan, Zhao Liwei, Zhao Lifei, et al.Contrasting analysis on multi-infeed VSC and AC grid-connection of new energy[J]. High Voltage Engineering,2017,43(4):1121—1128.
[9]宁光富,陈武,曹小鹏,等.适用于模块化级联光伏发电直流并网系统的均压策略[J].电力系统自动化,2016,40(19):66—72.[9] Ning Guangfu,Chen Wu,Cao Xiaopeng,et al. Voltagebalancing strategy for DC grid-connected photovoltaicpower generation systems with modular cascadedstructure[J]. Automation of Electric Power Systems,2016,40(19):66—72.
[10] Ghoddami H,Yazdani A. A Single-stage three-phasephotovoltaic system with enhanced maximum powerpoint tracking capability and increased power rating[J].IEEE Transactions on Power Delivery,2011,26(2):1017—1029.
[11]鞠昌斌,冯伟,王环,等.基于Boost隔离升压拓扑的光伏直流并网变流器的设计与实现[J].太阳能学报,2016,37(3):752—758.[11] Ju Changbin,Feng Wei,Wang Huan,et al. Design andimplement of photovoltaic DC grid-connected converterbased on boost isolated full-bridge topology[J]. ActaEnergiae Solaris Sinica,2016,37(3):752—758.
[12]赵伟然,李光辉,何国庆,等.光伏电站经VSC-HVDC并网拓扑及其控制策略[J].电网技术,2012,36(11):41—45.[12] Zhao Weiran, Li Guanghui, He Guoqing, et al.Topology of connecting photovoltaic power station topower grid via VSC-HVDC and its control strategy[J].Power System Technology,2012,36(11):41—45.
[13]罗宇强,谭建成,董国庆.级联式光伏电站直流并网拓扑及其控制策略[J].电力系统保护与控制,2016,44(13):14—19.[13] Luo Yuqiang,Tan Jiancheng,Dong Guoqing. Topologyof direct-current connecting cascaded photo-voltaicpower station to power grid and its control strategy[J].Power System Protection and Control,2016,44(13):14—19.
[14]鞠昌斌,王环,冯伟,等.应用于柔性直流输电网的光伏直流并网变流器研究[J].可再生能源,2014,32(9):1274—1280.[14] Ju Changbin,Wang Huan,Feng Wei,et al. Researchof photovoltaic DC grid-connected converter applied inflexible DC grid[J]. Renewable Energy Resources,2014,32(9):1274—1280.
[15] Kawamura T,Harada K,Ishihara Y,et al. Analysis ofMPPT characteristics in photovoltaic power system[J].Solar Energy Materials&Solar Cells,1997,47(s1-4):155—165.
[16] Menniti D, Burgio A, Sorrentino N, et al. Anincremental conductance method with variable step sizefor MPPT:Design and implementation[A].International Conference on Electrical Power Qualityand Utilisation[C],Lodz,Poland,2009.
[17]周东宝,陈渊睿.基于改进型变步长电导增量法的最大功率点跟踪策略[J].电网技术,2015,39(6):1491—1498.[17] Zhou Dongbao,Chen Yuanrui. Maximum power pointtracking strategy based on modified variable step-sizeincremental conductance algorithm[J]. Power SystemTechnology,2015,39(6):1491—1498.
[18]姚致清,于飞,赵倩,等.基于模块化多电平换流器的大型光伏并网系统仿真研究[J].中国电机工程学报,2013,33(36):27—33,6.[18] Yao Zhiqing,Yu Fei,Zhao Qian,et al. Simulationresearch on large-scale PV grid-connected systemsbased on MMC[J]. Proceedings of the CSEE,2013,33(36):27—33,6.
[19] Karthi K,Radhakrishnan R,Baskaran J M,et al.Performance analysis on various controllers of VSC-HVDC transmission systems[A]. IEEE InternationalConference on Computational Intelligence andComputing Research(ICCIC)[C],Chennai,India,2016.
[20]陈树勇,徐林岩,孙栩,等.基于多端柔性直流输电的风电并网控制研究[J].中国电机工程学报,2014,34(S1):32—38.[20] Chen Shuyong,Xu Linyan,Sun Xu,et al. The controlof wind power integration based on multi-terminal highvoltage DC transmission with voltage source converter[J]. Proceedings of the CSEE,2014,34(S1):32—38.
[2]丁明,王伟胜,王秀丽,等.大规模光伏发电对电力系统影响综述[J].中国电机工程学报,2014,34(1):2—14.[2] Ding Ming,Wang Weisheng,Wang Xiuli,et al. Areview on the effect of large-scale PV generation onpower systems[J]. Proceedings of the CSEE,2014,34(1):2—14.
[3] Han Xiaonan,Ai Xin,Sun Yingyun. Research on large-scale dispatchable grid-connected PV systems[J].Journal of Modern Power Systems and Clean Energy,2014,2(1):69—76.
[4]赵争鸣,雷一,贺凡波,等.大容量并网光伏电站技术综述[J].电力系统自动化,2011,35(12):101—107.[4] Zhao Zhengming,Lei Yi,He Fanbo,et al. Overview oflarge-scale grid-connected photovoltaic power plants[J].Automation of Electric Power Systems,2011,35(12):101—107.
[5] Tamimi B,Ca?izares C,Bhattacharya K. Modeling andperformance analysis of large solar photo-voltaicgeneration on voltage stability and inter-area oscillations[A]. IEEE Power and Energy Society General Meeting[C],Detroit,Michigan,USA,2011.
[6]许洪华.中国光伏发电技术发展研究[J].电网技术,2007,31(20):77—81.[6] Xu Honghua. The study on development of PVtechnology in China[J]. Power System Technology,2007,31(20):77—81.
[7]王常骐,郭家虎.风电场直流并网的拓扑结构研究[J].电网技术,2014,38(11):3065—3070.[7] Wang Changqi,Guo Jiahu. Research on topologicalstructures for dc grid-connection of wind farm[J]. PowerSystem Technology,2014,38(11):3065—3070.
[8]张新燕,赵理威,赵理飞,等.新能源多馈入直流并网与传统交流并网对比[J].高电压技术,2017,43(4):1121—1128.[8] Zhang Xinyan, Zhao Liwei, Zhao Lifei, et al.Contrasting analysis on multi-infeed VSC and AC grid-connection of new energy[J]. High Voltage Engineering,2017,43(4):1121—1128.
[9]宁光富,陈武,曹小鹏,等.适用于模块化级联光伏发电直流并网系统的均压策略[J].电力系统自动化,2016,40(19):66—72.[9] Ning Guangfu,Chen Wu,Cao Xiaopeng,et al. Voltagebalancing strategy for DC grid-connected photovoltaicpower generation systems with modular cascadedstructure[J]. Automation of Electric Power Systems,2016,40(19):66—72.
[10] Ghoddami H,Yazdani A. A Single-stage three-phasephotovoltaic system with enhanced maximum powerpoint tracking capability and increased power rating[J].IEEE Transactions on Power Delivery,2011,26(2):1017—1029.
[11]鞠昌斌,冯伟,王环,等.基于Boost隔离升压拓扑的光伏直流并网变流器的设计与实现[J].太阳能学报,2016,37(3):752—758.[11] Ju Changbin,Feng Wei,Wang Huan,et al. Design andimplement of photovoltaic DC grid-connected converterbased on boost isolated full-bridge topology[J]. ActaEnergiae Solaris Sinica,2016,37(3):752—758.
[12]赵伟然,李光辉,何国庆,等.光伏电站经VSC-HVDC并网拓扑及其控制策略[J].电网技术,2012,36(11):41—45.[12] Zhao Weiran, Li Guanghui, He Guoqing, et al.Topology of connecting photovoltaic power station topower grid via VSC-HVDC and its control strategy[J].Power System Technology,2012,36(11):41—45.
[13]罗宇强,谭建成,董国庆.级联式光伏电站直流并网拓扑及其控制策略[J].电力系统保护与控制,2016,44(13):14—19.[13] Luo Yuqiang,Tan Jiancheng,Dong Guoqing. Topologyof direct-current connecting cascaded photo-voltaicpower station to power grid and its control strategy[J].Power System Protection and Control,2016,44(13):14—19.
[14]鞠昌斌,王环,冯伟,等.应用于柔性直流输电网的光伏直流并网变流器研究[J].可再生能源,2014,32(9):1274—1280.[14] Ju Changbin,Wang Huan,Feng Wei,et al. Researchof photovoltaic DC grid-connected converter applied inflexible DC grid[J]. Renewable Energy Resources,2014,32(9):1274—1280.
[15] Kawamura T,Harada K,Ishihara Y,et al. Analysis ofMPPT characteristics in photovoltaic power system[J].Solar Energy Materials&Solar Cells,1997,47(s1-4):155—165.
[16] Menniti D, Burgio A, Sorrentino N, et al. Anincremental conductance method with variable step sizefor MPPT:Design and implementation[A].International Conference on Electrical Power Qualityand Utilisation[C],Lodz,Poland,2009.
[17]周东宝,陈渊睿.基于改进型变步长电导增量法的最大功率点跟踪策略[J].电网技术,2015,39(6):1491—1498.[17] Zhou Dongbao,Chen Yuanrui. Maximum power pointtracking strategy based on modified variable step-sizeincremental conductance algorithm[J]. Power SystemTechnology,2015,39(6):1491—1498.
[18]姚致清,于飞,赵倩,等.基于模块化多电平换流器的大型光伏并网系统仿真研究[J].中国电机工程学报,2013,33(36):27—33,6.[18] Yao Zhiqing,Yu Fei,Zhao Qian,et al. Simulationresearch on large-scale PV grid-connected systemsbased on MMC[J]. Proceedings of the CSEE,2013,33(36):27—33,6.
[19] Karthi K,Radhakrishnan R,Baskaran J M,et al.Performance analysis on various controllers of VSC-HVDC transmission systems[A]. IEEE InternationalConference on Computational Intelligence andComputing Research(ICCIC)[C],Chennai,India,2016.
[20]陈树勇,徐林岩,孙栩,等.基于多端柔性直流输电的风电并网控制研究[J].中国电机工程学报,2014,34(S1):32—38.[20] Chen Shuyong,Xu Linyan,Sun Xu,et al. The controlof wind power integration based on multi-terminal highvoltage DC transmission with voltage source converter[J]. Proceedings of the CSEE,2014,34(S1):32—38.