基于H桥的光伏并网逆变器不平衡功率控制
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摘要
针对采用光伏组件独立供电的H桥光伏并网逆变器,提出了一种不平衡功率控制策略,该策略用于解决光伏板直流侧输出功率不均衡问题。该策略通过实时计算三相交流功率获得三相不平衡功率系数,并依据简化调制算法加入占空比修正量使得三相不平衡功率系数趋向期望值。最后,通过Matlab/Simulink仿真和实验验证了该控制策略的可行性和有效性。
For the PV grid-connected inverter based on H-bridge which is supplied by the PV strings,an unbalanced power generation control method is proposed in this paper. The proposed control method can be used to resolve the unbalanced power supply issues by DC links. In this control method,three-phase power generation ratios can be derived through calculating real-time AC power,and the duration times are modified directly by the correction value derived from the proposed method. Eventually,the three-phase power generation ratios reach to their expected value accurately.Results obtained from simulations and experiments are presented to verify the feasibilities and superiorities of the proposed method.
For the PV grid-connected inverter based on H-bridge which is supplied by the PV strings,an unbalanced power generation control method is proposed in this paper. The proposed control method can be used to resolve the unbalanced power supply issues by DC links. In this control method,three-phase power generation ratios can be derived through calculating real-time AC power,and the duration times are modified directly by the correction value derived from the proposed method. Eventually,the three-phase power generation ratios reach to their expected value accurately.Results obtained from simulations and experiments are presented to verify the feasibilities and superiorities of the proposed method.
引文
[1] Liang X,Li R,Cai X. Control of a battery-energy-storage system based on a cascaded H-Bridge converter under fault condition[C]//Power Electronics and Motion Control Conference. NY:IEEE,2012:952-957.
[2]王书征,赵剑锋,姚晓君,等.级联型光伏并网逆变器在光照不均匀条件下的功率平衡控制[J].电工技术学报,2013,28(12):251-261.
[3] Babaei E,Buccella C,Saeedifard M. Recent advances in multilevel inverters and their applications—Part I[J]. IEEE Transactions on Industrial Electronics,2016,63(11):7145-7147.
[4]赵涛,张兴,毛旺,等.基于无功补偿的级联H桥光伏逆变器功率不平衡控制策略[J].中国电机工程学报,2017,37(17):5076-5085.
[5]刘晓飞,王斌,陈赟.多电平并网逆变器H桥功率跟踪及功率匹配控制[J].现代电子技术,2016,39(20):104-107.
[6]王付胜,张德辉,戴之强,等.级联H桥光伏并网逆变器混合调制策略[J].电工技术学报,2016,31(s1):137-145.
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[9]王恒利,徐绵起,程光锋.基于H5桥拓扑光伏并网逆变器共模电流抑制[J].电力电容器与无功补偿,2017,38(5):171-175.
[10]周丽红,安雪娥,徐江海,等.快速变步长光伏电池最大功率点跟踪方法[J].实验室研究与探索,2018,37(3):37-41.
[11] Yu Y, Konstantinou G, Hredzak B, et al. Power balance of cascaded H-bridge multilevel converters for large-scale photovoltaic integration[J]. IEEE Transactions on Power Electronics,2016,31(2):1108-1120.
[12]郭小强,张学,卢志刚,等.不平衡电网电压下光伏并网逆变器功率/电流质量协调控制策略[J].中国电机工程学报,2014,34(3):346-353.
[13]周皓,童朝南,刘宝其,等.电网不平衡条件下的光伏并网发电控制策略[J].电力系统自动化,2015,39(12):27-32.
[14]刘伟增,周洪伟,张磊,等.电网不平衡条件下光伏并网控制策略研究[J].太阳能学报,2013,34(4):647-652.
[15]朱晓荣,刘世鹏,张海宁,等.不平衡电网电压下光伏并网逆变器滑模直接电压/功率控制策略[J].电力系统保护与控制,2016,44(23):133-140.
[16] Ye Z,Xu Y,Wu X,et al. A simplified PWM strategy for a neutralpoint-clamped(NPC)three-level converter with unbalanced DC links[J]. IEEE Transactions on Power Electronics,2015,31(4):3227-3238.
[2]王书征,赵剑锋,姚晓君,等.级联型光伏并网逆变器在光照不均匀条件下的功率平衡控制[J].电工技术学报,2013,28(12):251-261.
[3] Babaei E,Buccella C,Saeedifard M. Recent advances in multilevel inverters and their applications—Part I[J]. IEEE Transactions on Industrial Electronics,2016,63(11):7145-7147.
[4]赵涛,张兴,毛旺,等.基于无功补偿的级联H桥光伏逆变器功率不平衡控制策略[J].中国电机工程学报,2017,37(17):5076-5085.
[5]刘晓飞,王斌,陈赟.多电平并网逆变器H桥功率跟踪及功率匹配控制[J].现代电子技术,2016,39(20):104-107.
[6]王付胜,张德辉,戴之强,等.级联H桥光伏并网逆变器混合调制策略[J].电工技术学报,2016,31(s1):137-145.
[7] Rivera S,Kouro S,Wu B,et al. Cascaded H-bridge multilevel converter multistring topology for large scale photovoltaic systems[C]//IEEE International Symposium on Industrial Electronics.NY:IEEE,2011:1837-1844.
[8]朱代祥,丁明.一种用于光伏电站的电力电子变压器[J].太阳能学报,2015,36(5):1206-1211.
[9]王恒利,徐绵起,程光锋.基于H5桥拓扑光伏并网逆变器共模电流抑制[J].电力电容器与无功补偿,2017,38(5):171-175.
[10]周丽红,安雪娥,徐江海,等.快速变步长光伏电池最大功率点跟踪方法[J].实验室研究与探索,2018,37(3):37-41.
[11] Yu Y, Konstantinou G, Hredzak B, et al. Power balance of cascaded H-bridge multilevel converters for large-scale photovoltaic integration[J]. IEEE Transactions on Power Electronics,2016,31(2):1108-1120.
[12]郭小强,张学,卢志刚,等.不平衡电网电压下光伏并网逆变器功率/电流质量协调控制策略[J].中国电机工程学报,2014,34(3):346-353.
[13]周皓,童朝南,刘宝其,等.电网不平衡条件下的光伏并网发电控制策略[J].电力系统自动化,2015,39(12):27-32.
[14]刘伟增,周洪伟,张磊,等.电网不平衡条件下光伏并网控制策略研究[J].太阳能学报,2013,34(4):647-652.
[15]朱晓荣,刘世鹏,张海宁,等.不平衡电网电压下光伏并网逆变器滑模直接电压/功率控制策略[J].电力系统保护与控制,2016,44(23):133-140.
[16] Ye Z,Xu Y,Wu X,et al. A simplified PWM strategy for a neutralpoint-clamped(NPC)three-level converter with unbalanced DC links[J]. IEEE Transactions on Power Electronics,2015,31(4):3227-3238.