基于光伏并网逆变器功率调整的本地电压选择性控制策略
|
摘要
针对分布式光伏电源大量接入配电网的趋势,分析了光伏电源对配电网电压分布的影响及并网点电压对逆变器输出功率的灵敏度,针对架空线路配电网提出了一种利用光伏逆变器剩余容量的本地电压选择性控制策略。并网点电压正常时,光伏逆变器运行于单位功率因数下MPPT模式;并网点电压越上限时,过电压调节器工作于无功优先方式,光伏逆变器首先输出抑制过电压所需的感性无功功率,然后根据逆变器剩余容量的限制输出尽可能多的有功功率;并网点电压越下限时,低电压调节器工作于有功优先方式,光伏逆变器首先输出MPPT下的有功功率,然后根据低电压改善的需要和逆变器剩余容量的限制输出相应的容性无功功率。仿真和实验结果表明,这种本地电压控制策略在保障电网电压合格的前提下可以充分利用光伏能量。
As the trend thata large number of access of distributed PV power into distribution grid,the influence of PV power on the voltage distribution of distribution grid and the sensitivity of inverter output power to voltage of grid-connected point is analyzed.A kind of selective control strategy of local voltage by the use of theresidual capacity of the PV inverter is proposed for the overhead line distribution grid.In case of normal voltage at the grid-connected point,the PV inverter operates at MPPT mode under unit power factor.When the voltage of the grid-connected point is above the upper limit,the overvoltage regulator operates at reactive power mode in priority mode.The PV inverter outputs the inductive reactive power needed for suppressing the overvoltage,then outputs as much as possible active power in accordance with the remaining capacity of the inverter.When the voltage of networking is lower than the lower limit,the low voltage regulator operates at active mode in priority.The PV inverter outputs active power of MPPT mode at first,then outputs corresponding capacitive reactive power in accordance with the need of low voltage improvement and the limit of the remaining capacity of the inverter.It is shown by the simulation and experimental result that this kind of local voltage control strategy can fully use PV energy under premises of assuring qualified grid voltage.
As the trend thata large number of access of distributed PV power into distribution grid,the influence of PV power on the voltage distribution of distribution grid and the sensitivity of inverter output power to voltage of grid-connected point is analyzed.A kind of selective control strategy of local voltage by the use of theresidual capacity of the PV inverter is proposed for the overhead line distribution grid.In case of normal voltage at the grid-connected point,the PV inverter operates at MPPT mode under unit power factor.When the voltage of the grid-connected point is above the upper limit,the overvoltage regulator operates at reactive power mode in priority mode.The PV inverter outputs the inductive reactive power needed for suppressing the overvoltage,then outputs as much as possible active power in accordance with the remaining capacity of the inverter.When the voltage of networking is lower than the lower limit,the low voltage regulator operates at active mode in priority.The PV inverter outputs active power of MPPT mode at first,then outputs corresponding capacitive reactive power in accordance with the need of low voltage improvement and the limit of the remaining capacity of the inverter.It is shown by the simulation and experimental result that this kind of local voltage control strategy can fully use PV energy under premises of assuring qualified grid voltage.
引文
[1]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):1-14.DING Ming,WANG Weisheng,WANG Xiuli,et al. A review on the effect of large-scale PV Generation on power systems[J]. Proceedings of the CSEE,2014,34(1):1-14.
[2]章杜锡,徐祥海,杨莉,等.分布式电源对配电网过电压的影响[J].电力系统自动化,2007,31(12):50-54.ZHANG Duxi,XU Xianghai,YANG Li,et al. The impact of distributed generators on distribution network over-voltage[J]. Automation of Electric Power Systems,2007,31(12):50-54.
[3]赵岩,胡学浩.分布式发电对配电网电压暂降的影响[J].电网技术,2008,32(14):5-9.ZHAO Yan,HU Xuehao. Impacts of distributed Generation on distribution system voltage sags[J]. Power System Technology,2008,32(14):5-9.
[4]刘伟,彭冬,卜广全,等.光伏发电接入智能配电网后的系统问题综述[J].电网技术,2009,32(19):1-6.LIU Wei,PENG Dong,BU Guangquan,et al. A survey on system problems in smart distribution network with gridconnected photovoltaic generation[J]. Power System Technology,2009,32(19):1-6.
[5]刘中原,王维庆,王海云,等.并网型光伏系统无功电压稳定性控制策略研究[J].电力电容器与无功补偿,2017,38(6):130-137.LIU Zhongyuan,WANG Weiqing,WANG Haiyun,et al.Study on the control strategy of reactive power voltage stability of grid-connected PV system[J]. Power Capacitor&Reactive Power Compensation,2017,38(6):130-137.
[6]吴杰,赵凡凡,赵丽霞.考虑光伏逆变器剩余容量的配电网无功优化[J].电工电能新技术,2017,36(1):38-43.WU Jie,ZHAO Fanfan,ZHAO Lixia. Reactive power optimization in distribution network considering residual capacity of photovoltaic inverter[J]. Advanced Technology of Electrical Engineering and Energy,2017,36(1):38-43.
[7]周林,曾意,郭珂,等.具有电能质量调节功能的光伏并网系统研究进展[J].电力系统保护与控制,2012,40(9):137-145.ZHOU Lin,ZENG Yi,GUO Ke,et al. Development of photovoltaic grid-connected system with power quality regulatory function[J]. Power System Protection and Control,2012,40(9):137-145.
[8]魏昊焜,刘健,高慧.分布式电源的本地电压控制策略[J].电力自动化设备,2016,36(9):40-45.WEI Haokun,LIU Jian,GAO Hui. Local voltage control of distributed generations[J]. Electric Power Automation Equipment,2016,36(9):40-45.
[9]刘健,同向前,潘忠美,等.考虑过电压因素时分布式光伏电源的准入容量[J].电力系统保护与控制,2014,42(6):45-51.LIU Jian,TONG Xiangqian,PAN Zhongmei,et al. The maximum power of distributed PV Generation according to over-voltage in distribution network[J]. Power System Protection and Control,2014,42(6):45-51.
[10]范元亮,赵波,江全元,等.过电压限制下分布式光伏电源最大允许接入峰值容量的计算[J].电力系统自动化,2012,36(17):40-44.FAN Yuanliang,ZHAO Bo,JIANG Quanyuan,et al. Peak capacity calculation of distributed photovoltaic source with constraint of over-voltage[J]. Automation of Electric Power Systems,2012,36(17):40-44.
[11]汪海宁,苏建徽,张国荣,等.光伏并网发电及无功补偿的统一控制[J].电工技术学报,2005,20(9):114-118.WANG Haining,SU Jianhui,ZHANG Guorong,et al. Unitive control of PV grid connected generation and reactive compensation[J]. Transactions of China Electrotechnical Society,2005,20(9):114-118.
[12]周林,晁阳,廖波,等.低压网络中并网光伏逆变器调压策略[J].电网技术,2013,37(9):2427-2432.ZHOU Lin,CHAO Yang,LIAO Bo,et al. A voltage regulation strategy by grid-connected PV inverters in low-voltage networks[J]. Power System Technology,2013,37(9):2427-2432.
[13]柴园园,郭力,王成山,等.含高渗透率光伏的配电网分布式电压控制[J].电网技术,2018,42(3):738-746.CHAI Yuanyuan,GUO Li,WANG Chengshan,et al. Distributed voltage control in distribution networks with high penetration of PV[J]. Power System Technology,2018,42(3):738-746.
[14]RENAUDINEAU H,DONATANTONIO F,FONTCHASTAGNER J,et al. A PSO-based global MPPT technique for distributed PV power Generation[J]. IEEE Transactions on Industrial Electronics,2015,62(2):1047-1058.
[15]同向前,伍文俊,任碧莹.电压源换流器在电力系统中的应用[M].北京:机械工业出版社,2012.
[2]章杜锡,徐祥海,杨莉,等.分布式电源对配电网过电压的影响[J].电力系统自动化,2007,31(12):50-54.ZHANG Duxi,XU Xianghai,YANG Li,et al. The impact of distributed generators on distribution network over-voltage[J]. Automation of Electric Power Systems,2007,31(12):50-54.
[3]赵岩,胡学浩.分布式发电对配电网电压暂降的影响[J].电网技术,2008,32(14):5-9.ZHAO Yan,HU Xuehao. Impacts of distributed Generation on distribution system voltage sags[J]. Power System Technology,2008,32(14):5-9.
[4]刘伟,彭冬,卜广全,等.光伏发电接入智能配电网后的系统问题综述[J].电网技术,2009,32(19):1-6.LIU Wei,PENG Dong,BU Guangquan,et al. A survey on system problems in smart distribution network with gridconnected photovoltaic generation[J]. Power System Technology,2009,32(19):1-6.
[5]刘中原,王维庆,王海云,等.并网型光伏系统无功电压稳定性控制策略研究[J].电力电容器与无功补偿,2017,38(6):130-137.LIU Zhongyuan,WANG Weiqing,WANG Haiyun,et al.Study on the control strategy of reactive power voltage stability of grid-connected PV system[J]. Power Capacitor&Reactive Power Compensation,2017,38(6):130-137.
[6]吴杰,赵凡凡,赵丽霞.考虑光伏逆变器剩余容量的配电网无功优化[J].电工电能新技术,2017,36(1):38-43.WU Jie,ZHAO Fanfan,ZHAO Lixia. Reactive power optimization in distribution network considering residual capacity of photovoltaic inverter[J]. Advanced Technology of Electrical Engineering and Energy,2017,36(1):38-43.
[7]周林,曾意,郭珂,等.具有电能质量调节功能的光伏并网系统研究进展[J].电力系统保护与控制,2012,40(9):137-145.ZHOU Lin,ZENG Yi,GUO Ke,et al. Development of photovoltaic grid-connected system with power quality regulatory function[J]. Power System Protection and Control,2012,40(9):137-145.
[8]魏昊焜,刘健,高慧.分布式电源的本地电压控制策略[J].电力自动化设备,2016,36(9):40-45.WEI Haokun,LIU Jian,GAO Hui. Local voltage control of distributed generations[J]. Electric Power Automation Equipment,2016,36(9):40-45.
[9]刘健,同向前,潘忠美,等.考虑过电压因素时分布式光伏电源的准入容量[J].电力系统保护与控制,2014,42(6):45-51.LIU Jian,TONG Xiangqian,PAN Zhongmei,et al. The maximum power of distributed PV Generation according to over-voltage in distribution network[J]. Power System Protection and Control,2014,42(6):45-51.
[10]范元亮,赵波,江全元,等.过电压限制下分布式光伏电源最大允许接入峰值容量的计算[J].电力系统自动化,2012,36(17):40-44.FAN Yuanliang,ZHAO Bo,JIANG Quanyuan,et al. Peak capacity calculation of distributed photovoltaic source with constraint of over-voltage[J]. Automation of Electric Power Systems,2012,36(17):40-44.
[11]汪海宁,苏建徽,张国荣,等.光伏并网发电及无功补偿的统一控制[J].电工技术学报,2005,20(9):114-118.WANG Haining,SU Jianhui,ZHANG Guorong,et al. Unitive control of PV grid connected generation and reactive compensation[J]. Transactions of China Electrotechnical Society,2005,20(9):114-118.
[12]周林,晁阳,廖波,等.低压网络中并网光伏逆变器调压策略[J].电网技术,2013,37(9):2427-2432.ZHOU Lin,CHAO Yang,LIAO Bo,et al. A voltage regulation strategy by grid-connected PV inverters in low-voltage networks[J]. Power System Technology,2013,37(9):2427-2432.
[13]柴园园,郭力,王成山,等.含高渗透率光伏的配电网分布式电压控制[J].电网技术,2018,42(3):738-746.CHAI Yuanyuan,GUO Li,WANG Chengshan,et al. Distributed voltage control in distribution networks with high penetration of PV[J]. Power System Technology,2018,42(3):738-746.
[14]RENAUDINEAU H,DONATANTONIO F,FONTCHASTAGNER J,et al. A PSO-based global MPPT technique for distributed PV power Generation[J]. IEEE Transactions on Industrial Electronics,2015,62(2):1047-1058.
[15]同向前,伍文俊,任碧莹.电压源换流器在电力系统中的应用[M].北京:机械工业出版社,2012.