具有低压穿越功能的微型燃机发电系统的并网控制策略

The Grid-Connected Control Strategy of the Microturbine Power Generation System with LVRT

针对电网发生短时故障时,要求在电网可恢复期间,微网能够不脱网运行。重点研究了三相电网电压发生短时对称跌落故障下,如何实现微型燃机发电系统(MTGS)的低压穿越技术(LVRT)。解决了该故障下造成的直流母线电压泵升问题、无功补偿问题以及如何快速准确地检测故障点电压问题。最终提出了一种MTGS在电网无故障下恒功率并网与电网故障下通过低压穿越维持并网的综合控制策略。仿真结果验证了该控制策略的有效性和可行性。

In view of requirement that the microgrid should not be off the power grid during the power grid recovery period after short-time faults occur to the power grid,this paper focuses on how to realize the low voltage ride through technology (LVRT) of the micro gas turbine power generation system (MTGS)when short-term faults of three-phase voltage symmet. rically occurs. The technology proposed has solved the DC bus voltage pumping and reactive power compensation problems and realized the fast and accurate detection of fault voltage during power grid faults. Finally an integrated control strategy including a regular grid-connected and LVRT technology is proposed. Simulation results show that the control technology proposed in this paper is reliable and effective.