重庆理工大学学报(自然科学版)
重慶理工大學學報(自然科學版)
중경리공대학학보(자연과학판)
JOURNAL OF CHONGQING INSTITUTE OF TECHNOLOGY
2015年
5期
103-111
,共9页
蒋东荣%颜瑞凡%申丹伟%蒋伟%李海龙
蔣東榮%顏瑞凡%申丹偉%蔣偉%李海龍
장동영%안서범%신단위%장위%리해룡
直流微网%分布式发电%储能系统%母线电压
直流微網%分佈式髮電%儲能繫統%母線電壓
직류미망%분포식발전%저능계통%모선전압
DC microgrid%distributed generation%energy storage system%bus voltage
直流微网内部的能量协调控制对电能质量和供电可靠性具有重要影响。尤其在孤岛状态下,当缺少交流主网支撑时,网内功率不平衡会引起直流母线电压失稳越限,造成供电质量严重下降,甚至导致系统崩溃。鉴于此,构建了多能互补直流微网模型,通过改进分层控制策略,利用直流母线电压变化因子决定不同控制层下各端变换器的工作状态,解决直流微网母线的电压稳定及能量优化协调控制问题,达到提高系统电能质量和供电可靠性的目的。最后,通过对各运行模式下直流母线电压与功率交换特性的关联例证分析,验证了控制策略在直流微网运行控制中的可行性与正确性。
直流微網內部的能量協調控製對電能質量和供電可靠性具有重要影響。尤其在孤島狀態下,噹缺少交流主網支撐時,網內功率不平衡會引起直流母線電壓失穩越限,造成供電質量嚴重下降,甚至導緻繫統崩潰。鑒于此,構建瞭多能互補直流微網模型,通過改進分層控製策略,利用直流母線電壓變化因子決定不同控製層下各耑變換器的工作狀態,解決直流微網母線的電壓穩定及能量優化協調控製問題,達到提高繫統電能質量和供電可靠性的目的。最後,通過對各運行模式下直流母線電壓與功率交換特性的關聯例證分析,驗證瞭控製策略在直流微網運行控製中的可行性與正確性。
직류미망내부적능량협조공제대전능질량화공전가고성구유중요영향。우기재고도상태하,당결소교류주망지탱시,망내공솔불평형회인기직류모선전압실은월한,조성공전질량엄중하강,심지도치계통붕궤。감우차,구건료다능호보직류미망모형,통과개진분층공제책략,이용직류모선전압변화인자결정불동공제층하각단변환기적공작상태,해결직류미망모선적전압은정급능량우화협조공제문제,체도제고계통전능질량화공전가고성적목적。최후,통과대각운행모식하직류모선전압여공솔교환특성적관련예증분석,험증료공제책략재직류미망운행공제중적가행성여정학성。
AbstraCt:Energy coordination control of DC microgrid would significantly impact the power quality and power supply reliability. Because of the islanding DC microgrid lacking support with the main grid,an abnormal DC voltage with power imbalance could seriously affect power supply quality,or e-ven cause the whole system collapse. Therefore,a multi-energy complementary DC microgrid model was built for resolving the voltage stability and energy optimal coordination control. Meanwhile,an improved hierarchical control strategy using the DC voltage variation range was utilized. Under any control level,the corresponding operation condition of converters would be autonomously chosen. So, DC microgrid power quality and supply reliability was improved. Finally,the characteristics of DC bus voltage and power exchange were analyzed in the simulations on a DC microgrid in different opera-tion modes. The simulations demonstrate the feasibility and validity of the proposed control strategies.