电磁耦合调速风力发电机组模拟实验研究

Experimental Study of Variable Speed Wind Turbines Based on Electromagnetic Couplers

电磁耦合调速风力发电机组实现了同步发电机直接并网运行,可有效地改善风电机组的暂态过载、故障穿越和电网电压支撑能力,提高风电机组与电力系统的兼容性。利用变频调速电磁耦合装置将齿轮箱输出轴功率以非接触方式传递到同步发电机,增加了功率传动的灵活性,避免了发电机故障冲击转矩对齿轮箱的破坏。为了研究该类机组的运行控制方法和功率传输效率等问题,该文设计并搭建一套30 kW电磁耦合调速风电机组模拟实验平台,通过实验验证了所提出电磁耦合调速风电机组的启动、并网、不同风况下稳态运行、脱网及停机等各阶段控制策略的有效性。测量了电磁耦合调速装置在不同运行工况下的功率传输效率。

Synchronous generator directly connected to the grid can be employed in the variable speed wind turbine by introducing electromagnetic coupler in its power train.That improves the transient overload,fault ride-through and voltage support capability of the wind turbine and the compatibility between wind turbine and power system effectively.The inverter fed electromagnetic coupler transmits the power from gearbox to generator flexibly,and protects the gearbox from impact of fault torque occurred in the generator.In order to investigate the effectiveness of the operation control strategies for such wind turbine and measure the efficiency of power transmission of the electromagnetic coupler experimentally,a 30kW test platform for simulating the variable speed wind turbine based on electromagnetic coupler was designed and implemented.Control strategies including start and stop,synchronizing and closing to the grid,load adjustment were verified by experiment,and transmission efficiencies of the electromagnetic coupler running at different wind conditions were measured.