CAJ | 학술논문

从功率流向角度对已有低电压穿越（LVRT）方法进行归纳总结,在此基础上提出一种LVRT控制策略：基于机电储能,利用机侧变流器稳定直流母线电压,网侧变流器实现最大风能跟踪。该控制策略结合散热要求大大降低的制动电阻与变桨距调节技术,可以在不增加控制复杂度、不显著增加系统成本的情况下,充分利用风电机组惯性,存储电网电压跌落时系统的不平衡能量,平稳实现LVRT。通过对1.5MW永磁直驱风电系统的MATLAB仿真,验证了所提出的LVRT控制策略的正确性和有效性。
종공솔류향각도대이유저전압천월（LVRT）방법진행귀납총결,재차기출상제출일충LVRT공제책략：기우궤전저능,이용궤측변류기은정직류모선전압,망측변류기실현최대풍능근종。해공제책략결합산열요구대대강저적제동전조여변장거조절기술,가이재불증가공제복잡도、불현저증가계통성본적정황하,충분이용풍전궤조관성,존저전망전압질락시계통적불평형능량,평은실현LVRT。통과대1.5MW영자직구풍전계통적MATLAB방진,험증료소제출적LVRT공제책략적정학성화유효성。
This paper summarizes the existing low voltage ride through（LVRT） methods from power flow prospective,and proposes a LVRT control strategy based on the electromechanical energy storage.The generator-side converter maintains DC-link voltage while the grid-side converter tracks the maximum power point of wind energy.This control strategy combines braking resistor with greatly reduced cooling requirements and variable-pitch structure technology,can make full use of the wind turbines＇ inertial characteristics to store the imbalanced energy and realize LVRT smoothly,without increasing control complexity and system costs significantly.The correctness and validity of this LVRT control strategy is verified through MATLAB simulation of a 1.5 MW permanent magnet synchronous generator（PMSG） wind generation system.