CAJ | 학술논문

在分析电网对称故障下含飞轮储能单元的永磁直驱风力发电系统运行行为的基础上,提出适于该类型风力发电系统的低电压穿越运行控制策略。所提出的控制策略通过协调控制电机侧变换器、电网侧变换器及飞轮电机变换器,在实现故障时系统直流链电压稳定控制的同时,可满足发电系统向电网注入一定无功功率的运行要求,有效增强了发电系统的低电压穿越运行性能。通过仿真计算,验证了所述控制策略的有效性。进一步分析了影响发电系统低电压穿越运行性能的因素,并对发电系统的低电压穿越能力进行了评估。
재분석전망대칭고장하함비륜저능단원적영자직구풍력발전계통운행행위적기출상,제출괄우해류형풍력발전계통적저전압천월운행공제책략。소제출적공제책략통과협조공제전궤측변환기、전망측변환기급비륜전궤변환기,재실현고장시계통직류련전압은정공제적동시,가만족발전계통향전망주입일정무공공솔적운행요구,유효증강료발전계통적저전압천월운행성능。통과방진계산,험증료소술공제책략적유효성。진일보분석료영향발전계통저전압천월운행성능적인소,병대발전계통적저전압천월능력진행료평고。
The operational behavior of the direct-driven permanent magnet synchronous generator （PMSG） wind turbine with flywheel energy storage unit under grid symmetrical fault conditions is analyzed. Based on that, a coordinated control strategy for the generator-side converter, grid-side converter and flywheel motor-side converter is proposed to enhance the low voltage ride-through （LVRT） performance of the whole system. The proposed control strategy can not only keep the DC-link voltage stable, but also deliver proper reactive power from the system to the grid during the network fault, effectively enhancing the LVRT performance. The proposed control strategy is verified by the simulation results. Furthermore, the key factors that influence the LVRT capability are analyzed, and the LVRT ability of the system is assessed.