CAJ | 학술논문

随着我国风电装机容量不断扩大，风电场具备低电压穿越能力已成为其并网发电的必要条件。而传统笼型异步发电机组本身并不具备低电压穿越能力，因此提出了一种串联耦合补偿(series coupled compensation，SCC)新型低电压穿越方案，SCC 通过变压器串联接在发电机定子与公共连接点之间，配合双向晶闸管进行投切。在PSCAD/EMTDC建立了750 kW异步发电机组的串联补偿系统，仿真结果表明在各种电压故障下SCC能有效提高机组低电压穿越能力，同时减小电磁转矩振荡。
수착아국풍전장궤용량불단확대，풍전장구비저전압천월능력이성위기병망발전적필요조건。이전통롱형이보발전궤조본신병불구비저전압천월능력，인차제출료일충천련우합보상(series coupled compensation，SCC)신형저전압천월방안，SCC 통과변압기천련접재발전궤정자여공공련접점지간，배합쌍향정갑관진행투절。재PSCAD/EMTDC건립료750 kW이보발전궤조적천련보상계통，방진결과표명재각충전압고장하SCC능유효제고궤조저전압천월능력，동시감소전자전구진탕。
With ever-increasing of installed capacity of wind power generators in China, it becomes a necessary condition for wind farms to be grid-connected to exist the ability of low-voltage ride-through (LVRT). In view of the fact that traditional squirrel cage induction generator (SCIG) does not exist the LVRT ability, a new LVRT scheme using series coupled compensation (SCC) is proposed: the SCC is connected in series to the position between the stator of SCIG and the point of common coupling (PCC) via a transformer and is switched on/off in coordinating with bi-directional thyristor. By means of PSCAD/EMTDC a simulation model of SCC system for SCIG with capacity of 750 kW is established and simulation results show that in spite of various voltage faults, the SCC can improve the LVRT ability of SCIG unit effectively and suppress oscillation of electromagnetic torque by compensating the voltage drop at PCC.