中国电机工程学报
中國電機工程學報
중국전궤공정학보
Proceedings of the CSEE
2015年
19期
4947-4955,后插6
,共10页
曾正%邵伟华%赵伟芳%冉立%杨欢%赵荣祥
曾正%邵偉華%趙偉芳%冉立%楊歡%趙榮祥
증정%소위화%조위방%염립%양환%조영상
并网微电网%多功能并网逆变器%无功和谐波电流分摊%协调控制%无功和谐波视在功率下垂
併網微電網%多功能併網逆變器%無功和諧波電流分攤%協調控製%無功和諧波視在功率下垂
병망미전망%다공능병망역변기%무공화해파전류분탄%협조공제%무공화해파시재공솔하수
grid-connected micro-grid%multi-functional grid-tied inverter%sharing of harmonic and reactive load current%coordinated control%droop scheme of harmonic and reactive capacity
多功能并网逆变器(multi-functional grid-tied inverter, MFGTI)在实现可再生能源并网的同时,复合了电能质量治理功能的并网逆变器,在微电网和分布式发电系统中具有重要的应用前景.该文针对并网微网中的谐波和无功电流等电能质量问题,研究多台MFGTI之间无互联通信线的协调控制策略,基于谐波和无功负荷容量下垂的思想提出了一种有效的协调控制方案.每台MFGTI根据设定的"并网点处无功和谐波负荷电流的视在容量"与"补偿比例系数"之间的下垂特性,实现并网微网中无功和谐波负荷电流在多台MFGTI之间的分摊.因此,每台MFGTI只需采集本地的电气信息,即可根据自身所能提供的补偿容量,独立、自治地参与微网电能质量的治理,不需要额外的互联通信线.此外,为了降低控制器的计算负担,提出了一种简化的计算方法,以有效识别负荷电流中待补偿分量的视在容量,并进行了详细分析和验证.最后,在一个并网微网实验平台上,利用两台 10 kVA 的 MFGTI 验证了所提控制策略在分布式电源并网和并网微电网电能质量治理中的正确性和有效性.
多功能併網逆變器(multi-functional grid-tied inverter, MFGTI)在實現可再生能源併網的同時,複閤瞭電能質量治理功能的併網逆變器,在微電網和分佈式髮電繫統中具有重要的應用前景.該文針對併網微網中的諧波和無功電流等電能質量問題,研究多檯MFGTI之間無互聯通信線的協調控製策略,基于諧波和無功負荷容量下垂的思想提齣瞭一種有效的協調控製方案.每檯MFGTI根據設定的"併網點處無功和諧波負荷電流的視在容量"與"補償比例繫數"之間的下垂特性,實現併網微網中無功和諧波負荷電流在多檯MFGTI之間的分攤.因此,每檯MFGTI隻需採集本地的電氣信息,即可根據自身所能提供的補償容量,獨立、自治地參與微網電能質量的治理,不需要額外的互聯通信線.此外,為瞭降低控製器的計算負擔,提齣瞭一種簡化的計算方法,以有效識彆負荷電流中待補償分量的視在容量,併進行瞭詳細分析和驗證.最後,在一箇併網微網實驗平檯上,利用兩檯 10 kVA 的 MFGTI 驗證瞭所提控製策略在分佈式電源併網和併網微電網電能質量治理中的正確性和有效性.
다공능병망역변기(multi-functional grid-tied inverter, MFGTI)재실현가재생능원병망적동시,복합료전능질량치리공능적병망역변기,재미전망화분포식발전계통중구유중요적응용전경.해문침대병망미망중적해파화무공전류등전능질량문제,연구다태MFGTI지간무호련통신선적협조공제책략,기우해파화무공부하용량하수적사상제출료일충유효적협조공제방안.매태MFGTI근거설정적"병망점처무공화해파부하전류적시재용량"여"보상비례계수"지간적하수특성,실현병망미망중무공화해파부하전류재다태MFGTI지간적분탄.인차,매태MFGTI지수채집본지적전기신식,즉가근거자신소능제공적보상용량,독립、자치지삼여미망전능질량적치리,불수요액외적호련통신선.차외,위료강저공제기적계산부담,제출료일충간화적계산방법,이유효식별부하전류중대보상분량적시재용량,병진행료상세분석화험증.최후,재일개병망미망실험평태상,이용량태 10 kVA 적 MFGTI 험증료소제공제책략재분포식전원병망화병망미전망전능질량치리중적정학성화유효성.
Multi-functional grid-tied inverters (MFGTIs) are grid-tied inverters, which integrate renewable energy sources into utilities and provide auxiliary services to enhance the power quality of grid-connected micro-grids. To coordinate the multiple MFGTIs in a grid-connected micro-grid to share and to compensate the harmonics and reactive load currents without communication wires, a droop-based control scheme is presented. Each MFGTI detects the harmonic and reactive issues at its terminal, and partly enhances the power quality according to its available capacity margin and the proposed droop scheme. Besides, in order to reduce the burden of the controller on computation, a simplified approach is presented to calculate the capacity of harmonics and reactive load currents. An MFGTI just senses its terminal electrical information, and no extra communication wire is required. As a result, each MFGTI can independently and autonomously enhance the power quality of a grid-connected micro-grid. Finally, the experimental results performed on a micro-grid feeder verified the validity and effectiveness of the presented coordinated control strategy to enhance the power quality issues of grid-connected micro-grids by means of MFGTIs.
