CAJ | 학술논문

为满足并网风电机组在电网电压在一定范围内瞬间跌落时不脱网运行，通过分析DFIG电压跌落时的暂态过程，建立一种基于STATCOM和Crowbar的低电压穿越控制策略。 STATCOM采用恒电压控制策略，适当地调节交流侧输出的幅值和相位，以提供满足系统电压稳定的无功功率；Crowbar电路的投切，对转子电流或直流侧电压滞环比较来控制，以卸荷多余能量并保护变流器，从而实现低电压穿越。最后，在PSCAD/EMTDC平台建立了DFIG的LVRT仿真模型，结果表明：该策略使DFIG在电压跌落较深情况下具备了低电压穿越能力。
위만족병망풍전궤조재전망전압재일정범위내순간질락시불탈망운행，통과분석DFIG전압질락시적잠태과정，건립일충기우STATCOM화Crowbar적저전압천월공제책략。 STATCOM채용항전압공제책략，괄당지조절교류측수출적폭치화상위，이제공만족계통전압은정적무공공솔；Crowbar전로적투절，대전자전류혹직류측전압체배비교래공제，이사하다여능량병보호변류기，종이실현저전압천월。최후，재PSCAD/EMTDC평태건립료DFIG적LVRT방진모형，결과표명：해책략사DFIG재전압질락교심정황하구비료저전압천월능력。
To meet the grid code requirements on wind turbine generators low voltage fault ride through( LVRT) capa-bility ,a control strategy with integrating STATCOM and Crowbar circuit is proposed to keep LVRT capability through an-alyzing the transient of DFIG. STATCOM adopts a constant voltage control strategy, adjusting the amplitude and phase of the AC side output appropriately by constant-voltage control to provide reactive power to recover the system voltage. The switch of crowbar circuit is controlled by the hysteresis of the rotor current or DC voltage to dump the superabundant energy and protect power inverter. Finally, DFIG and LVRT simulation model is established on PSCAD / EMTDC, the result of which shows that the strategy makes LVRT capability available for DFIG under sharp voltage dip case.