高电压技术
高電壓技術
고전압기술
HIGH VOLTAGE ENGINEERING
2012年
6期
1473-1479
,共7页
直驱%风电系统%故障穿越%锁频环(FLL)%变流器控制%电网同步化
直驅%風電繫統%故障穿越%鎖頻環(FLL)%變流器控製%電網同步化
직구%풍전계통%고장천월%쇄빈배(FLL)%변류기공제%전망동보화
direct drive%wind power generation system%fault ride-through%frequency-locked loop(FLL)%convertercontrol%grid synchronization
为了能够在电网故障下对直驱风电系统传递给电网的功率进行持续控制,避免变流器保护跌落和提高瞬态故障穿越能力,对故障电压基波正负序分量进行快速而准确的检测是必要的。提出了一种不平衡和畸变电压运行条件下风电系统网侧变流器的新型电网同步化技术,即双二阶通用积分器-锁频环（DSOGI-FLL）。这个新的检测器包括正交信号发生器、正负序分量计算器和锁频环3个基本函数模块。对DSOGI-FLL进行的仿真和试验结果表明这种新型软件锁相环便于数字实现,能对不对称和畸变电网电压进行快速、准确检测和稳定跟踪;DSOGI-FLL是直驱风电系统网侧变流器在电网电压不平衡和畸变条件下的一个合适的电网同步化方法。
為瞭能夠在電網故障下對直驅風電繫統傳遞給電網的功率進行持續控製,避免變流器保護跌落和提高瞬態故障穿越能力,對故障電壓基波正負序分量進行快速而準確的檢測是必要的。提齣瞭一種不平衡和畸變電壓運行條件下風電繫統網側變流器的新型電網同步化技術,即雙二階通用積分器-鎖頻環（DSOGI-FLL）。這箇新的檢測器包括正交信號髮生器、正負序分量計算器和鎖頻環3箇基本函數模塊。對DSOGI-FLL進行的倣真和試驗結果錶明這種新型軟件鎖相環便于數字實現,能對不對稱和畸變電網電壓進行快速、準確檢測和穩定跟蹤;DSOGI-FLL是直驅風電繫統網側變流器在電網電壓不平衡和畸變條件下的一箇閤適的電網同步化方法。
위료능구재전망고장하대직구풍전계통전체급전망적공솔진행지속공제,피면변류기보호질락화제고순태고장천월능력,대고장전압기파정부서분량진행쾌속이준학적검측시필요적。제출료일충불평형화기변전압운행조건하풍전계통망측변류기적신형전망동보화기술,즉쌍이계통용적분기-쇄빈배（DSOGI-FLL）。저개신적검측기포괄정교신호발생기、정부서분량계산기화쇄빈배3개기본함수모괴。대DSOGI-FLL진행적방진화시험결과표명저충신형연건쇄상배편우수자실현,능대불대칭화기변전망전압진행쾌속、준학검측화은정근종;DSOGI-FLL시직구풍전계통망측변류기재전망전압불평형화기변조건하적일개합괄적전망동보화방법。
It is essential for accurate and fast detection of fundamental frequency positive- and negative-sequence component of the utility voltage under grid fault to keep the control over the power exchange with the grid to avoid trip of the converter protections and to allow the ride-through of the transient fault. We proposed a new technique for grid synchronization of grid-side converter in direct drive wind power generation system under unbalanced and distorted conditions, i. e. , the dual second order generalized integrator frequency-locked loop（DSOGI-FLL）. The proposed detector includes three fundamental function blocks, namely, the quadrature-signals generator （QSG）, positive- and negative- sequence calculator （PNSC） and frequency-locked loop （FLL）. Moreover, the DSOGI-FLL was studied by simulation and experiment. The obtained simulation and experiment results demonstrate that this new software phase-locked loop is easy to implement by digital and can detect and track asymmetrical and distorted grid voltage rapidly and accurately, and the results indicate that the DSOGI-FLL is a very suitable solution for grid synchronization of grid-side converter in direct drive wind power generation system under unbalanced and distorted conditions.
