中国电机工程学报
中國電機工程學報
중국전궤공정학보
ZHONGGUO DIANJI GONGCHENG XUEBAO
2013年
27期
20-27
,共8页
王松%谈龙成%李耀华%王平%宋鹏先%任洪涛
王鬆%談龍成%李耀華%王平%宋鵬先%任洪濤
왕송%담룡성%리요화%왕평%송붕선%임홍도
静止同步补偿器%链式结构%零序电压%不平衡负载补偿%静止坐标系
靜止同步補償器%鏈式結構%零序電壓%不平衡負載補償%靜止坐標繫
정지동보보상기%련식결구%령서전압%불평형부재보상%정지좌표계
static synchronous compensator (STATCOM)%cascade circuit%zero-sequence voltage%unbalanced load compensation%stationary frame
星形结构的链式静止同步补偿器(static synchronous compensator,STATCOM)受限于三相输出电流之和等于零的约束条件,因此,在补偿不平衡负载时,必须注入零序电压,以强迫输出电流的相位与 STATCOM 相电压的相位相差90°。首先推导在补偿不平衡负载工况下所要添加的零序电压的数学公式,证明该工况下零序电压添加的必要性与唯一性;然后改进适用于补偿不平衡负载工况的目标电流提取方法,该方法能有效减少参考电流的二倍频分量。而且,提出的零序电压计算方法,无需对参考电流锁相,参考电流提取完毕后,即可计算出零序电压。给出基于经典控制理论在αβ静止坐标系下的参考电流跟踪控制策略。最后,仿真与实验结果验证了所提出方法的正确性。
星形結構的鏈式靜止同步補償器(static synchronous compensator,STATCOM)受限于三相輸齣電流之和等于零的約束條件,因此,在補償不平衡負載時,必鬚註入零序電壓,以彊迫輸齣電流的相位與 STATCOM 相電壓的相位相差90°。首先推導在補償不平衡負載工況下所要添加的零序電壓的數學公式,證明該工況下零序電壓添加的必要性與唯一性;然後改進適用于補償不平衡負載工況的目標電流提取方法,該方法能有效減少參攷電流的二倍頻分量。而且,提齣的零序電壓計算方法,無需對參攷電流鎖相,參攷電流提取完畢後,即可計算齣零序電壓。給齣基于經典控製理論在αβ靜止坐標繫下的參攷電流跟蹤控製策略。最後,倣真與實驗結果驗證瞭所提齣方法的正確性。
성형결구적련식정지동보보상기(static synchronous compensator,STATCOM)수한우삼상수출전류지화등우령적약속조건,인차,재보상불평형부재시,필수주입령서전압,이강박수출전류적상위여 STATCOM 상전압적상위상차90°。수선추도재보상불평형부재공황하소요첨가적령서전압적수학공식,증명해공황하령서전압첨가적필요성여유일성;연후개진괄용우보상불평형부재공황적목표전류제취방법,해방법능유효감소삼고전류적이배빈분량。이차,제출적령서전압계산방법,무수대삼고전류쇄상,삼고전류제취완필후,즉가계산출령서전압。급출기우경전공제이론재αβ정지좌표계하적삼고전류근종공제책략。최후,방진여실험결과험증료소제출방법적정학성。
The star-connected cascade circuit static synchronous compensator (STATCOM) is subjected to the restriction that the sum of three phase output currents is zero. Consequently, in order to compensate the unbalanced load currents, zero-sequence voltage must be added to the phase-to-neutral voltage of the converter, to force the improved phase-to-neutral voltage to be orthogonal to the output current for every phase. This paper firstly deduced the zero-sequence voltage in condition of unbalanced load compensation, the expression of which is unique and the adding is necessary in this working condition. Secondly, the improved reference current detection method was also presented, which can reduce the 2nd ripple effectively. Besides, the zero-sequence voltage calculation presented in this paper depends on reference currents detection completely, without detecting the phases of reference currents in advance. Finally, the precise reference current tracking strategy was also presented based on classical control theory under αβ stationary frame. Simulation and experiment results verify the feasibility and effectiveness of the control strategy.