电力系统保护与控制
電力繫統保護與控製
전력계통보호여공제
POWER SYSTM PROTECTION AND CONTROL
2014年
8期
34-39
,共6页
邓雪松%欧开健%陈鹏%崔小岳
鄧雪鬆%歐開健%陳鵬%崔小嶽
산설송%구개건%진붕%최소악
模块化多电平换流器(MMC)%无差拍%最近电平%高压直流输电
模塊化多電平換流器(MMC)%無差拍%最近電平%高壓直流輸電
모괴화다전평환류기(MMC)%무차박%최근전평%고압직류수전
MMC%deadbeat%NLM%HVDC
随着电平数的增加,基于dq0旋转坐标系MMC-HVDC的控制器运算量会非常大。为了提高运算速度,根据MMC换流器的等效电路设计了基于三相静止坐标系下的MMC-HVDC系统控制器。该控制器将无差拍电流控制与最近电平调制算法相结合,并对电流参考值的采样选取方法进行了改进,提高了控制器精度。该控制器不仅动态响应快,精度高,实现了解耦控制,而且减少了坐标转换与PI调节环节,降低了控制系统的运算量。通过在PSCAD/EMTDC下建立MMC-HVDC的仿真模型,仿真结果验证了控制器的有效性。
隨著電平數的增加,基于dq0鏇轉坐標繫MMC-HVDC的控製器運算量會非常大。為瞭提高運算速度,根據MMC換流器的等效電路設計瞭基于三相靜止坐標繫下的MMC-HVDC繫統控製器。該控製器將無差拍電流控製與最近電平調製算法相結閤,併對電流參攷值的採樣選取方法進行瞭改進,提高瞭控製器精度。該控製器不僅動態響應快,精度高,實現瞭解耦控製,而且減少瞭坐標轉換與PI調節環節,降低瞭控製繫統的運算量。通過在PSCAD/EMTDC下建立MMC-HVDC的倣真模型,倣真結果驗證瞭控製器的有效性。
수착전평수적증가,기우dq0선전좌표계MMC-HVDC적공제기운산량회비상대。위료제고운산속도,근거MMC환류기적등효전로설계료기우삼상정지좌표계하적MMC-HVDC계통공제기。해공제기장무차박전류공제여최근전평조제산법상결합,병대전류삼고치적채양선취방법진행료개진,제고료공제기정도。해공제기불부동태향응쾌,정도고,실현료해우공제,이차감소료좌표전환여PI조절배절,강저료공제계통적운산량。통과재PSCAD/EMTDC하건립MMC-HVDC적방진모형,방진결과험증료공제기적유효성。
With the increment of level, there is a large amount of the computation for the controller of MMC-HVDC system. To speed up, according to the equivalent circuit of MMC converter, this paper designs the controller of MMC-HVDC system based on the three-phase static coordinate system. The controller combines deadbeat current control with nearest level modulation (NLM), and improves the sampling selection method of current reference value for the precision. The proposed controller realizes decoupling control with fast dynamic response and high precision, decreases the amount of system computation with less PI regulator and coordinate transformation. The MMC-HVDC simulation model is established in PSCAD/EMTDC environment and the simulation results verify the validity of proposed controller.