摘要
为了实现风电场双馈感应电机低电压穿越技术的可操作性和低成本投资,提出一种柔性串联制动电阻技术。FSBR开关采用具有反应速度快、可控性好、运行方式灵活的柔性电力电子器件IGBT对FSBR阻值大小和投切时间进行整定;分析了基于FSBR技术的双馈感应电机转子侧与并网侧变换器的整体控制策略,设计的线性增益反馈环节配合FSBR可以减少有功输出,提高无功补偿,减轻了转子过电压和过电流双重暂态故障。稳态与短路仿真结果表明,FSBR技术能在一定程度上对暂态分量进行削峰填谷,优化注入到电网的风电有功和无功功率,能降低DFIG故障穿越的控制复杂度,有利于风电场并网运行及可靠供电。
To facilitate the operation and reduce the in- vestment of the low voltage ride-through （LVRT）for the doubly-fed induction generator, this paper proposes a method of flexible series braking resistor （FSBR）. The FSBR switch using the Insulated-gate Bipolar Transistor（IGBT）which is fast in response, good in control performance and flexible in operation mode, calculates and tunes the magnitude and switching time of the FSBR. Rotor converter side and grid side control strategies of the converter are also analyzed. Linear gain feedback （LGF）is designed to cooperate with FSBR to depress the transient fault amplitudes of both overvohage and overcurrent by decreasing active power output and compensating reactive pow- er. The steady state and shortcut simulation results show that the proposed FSBR can realize peak clipping and valley filling of fault voltage to some extent, optimize the wind active and reactive power injected into grid system and decrease the difficulties of the LVRT control, which is beneficial to the gridconnected wind farm operation and helps to keep power supply to grid reliable.
作者
李功
陈东升
李健
郑玉浩
LI Gong CHEN Dongsheng LI Jian ZHENG Yuhao(Beijing Institute of Space Eleetromechanieal Research, Beijing 100094, China College of Automation Engineering, Northeast Dianli University, Jilin 132012, Jilin, China State Grid Weifang Power Supply Company, Weifang 261021, Shandong, China)
出处
《电网与清洁能源》
北大核心
2017年第4期27-33,共7页
Power System and Clean Energy
基金
国家自然科学基金青年基金项目(61403075)~~
关键词
双馈感应电机
低电压穿越
柔性串联制动电阻
线性增益反馈
doubly-fed induction generator
low voltage ride--through
flexible series braking resistor
linear gain feedback
