基于风力发电系统低电压穿越技术研究

Research on Low Voltage Ride-through Technology Based on Wind Power System

风力发电是目前应用广泛的新能源之一,当风电并网后若电网电压发生跌落时控制策略没有及时作出调整,将可能导致风机飞车,直流侧电容电压升高,严重威胁电力电子功率器件运行安全。本文研究了直驱永磁风力发电系统的运行机理和拓扑结构,阐述了风电并网所需满足的低电压穿越技术要求,并将模型预测控制算法应用于直驱永磁风力发电系统低电压穿越控制,构建了包含网侧和机侧电流的价值函数,通过滚动优化实现风速变化时的直流电压稳定和最大功率跟踪,通过MATLAB仿真平台验证了该方法的有效性。

Wind power is one of the most widely used new energy sources.If the control strategy is not adjusted in time when the grid voltage drops after wind power is connected to the grid,it may cause the wind turbine to fly and the DC side capacitance voltage to rise,which seriously threatens the operation safety of power electronic power devices.In this paper,we study the operation mechanism and topology of direct-drive permanent magnet wind power generation system,describe the low-voltage ride-through technology requirements to be met by wind power grid connection,and apply the model predictive control algorithm to the low-voltage ride-through control of direct-drive permanent magnet wind power generation system,construct a value function containing the network-side and machine-side currents,and realize the DC voltage stabilization and maximum power tracking when the wind speed changes through rolling optimization,and verify the method by MATLAB simulation platform verifies the effectiveness of the method.