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首页> 外文会议>Twenty-Eighth Annual IEEE Applied Power Electronics Conference and Exposition >Low voltage ride through control strategy for high-power grid-connected photovoltaic inverter
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Low voltage ride through control strategy for high-power grid-connected photovoltaic inverter

机译：大功率并网光伏逆变器的低压穿越控制策略

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摘要

This paper presents a low voltage ride through (LVRT) control strategy for high-power grid-connected photovoltaic (PV) inverter, which can assure the PV inverter operates under grid faults with sinusoidal output currents. The control strategy of PV inverter is made up of inner current loops and outer voltage loop in a cascade structure under normal working conditions. The outer loop regulates the voltage on dc-link capacitance to the maximum power point of PV arrays, and the inner current loops are composed of four closed loops for positive sequence and negative sequence in synchronous reference frame. If the low voltage fault signal has been detected, the control system should shift to single loops control strategy for low voltage ride through. Finally, a laboratory prototype of 150 kW PV inverter with LCL filter has been implemented to test the theoretical analysis. The feasibility and effectiveness of the proposed LVRT control strategy have been verified by simulation and experimental results.
机译：本文提出了一种用于大功率并网光伏（PV）逆变器的低压穿越（LVRT）控制策略，该策略可以确保PV逆变器在具有正弦输出电流的电网故障下运行。在正常工作条件下，光伏逆变器的控制策略由内部电流回路和外部电压回路以级联结构组成。外部环路将直流链路电容上的电压调节至PV阵列的最大功率点，内部电流环路由四个闭合环路组成，用于同步参考帧中的正序和负序。如果已检测到低压故障信号，则控制系统应切换到单回路控制策略以实现低压穿越。最后，已经实现了带有LCL滤波器的150 kW光伏逆变器的实验室原型，以测试理论分析。仿真和实验结果验证了所提出的LVRT控制策略的可行性和有效性。

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