用于提高双馈风力机低电压穿越能力的超级电容储能容量配置及控制策略研究  

Research on the Sizing and Control Scheme of Super Capacitor System for LVRT of Double-Fed Wind Generator

作　　者：王树军[1] 刘健[1] 赵国良 刘树清 徐硕[1] WANG Shujun;LIU Jian;ZHAO Guoliang;UU Shuqing;XU Shuo(State Grid Jibei Electric Power Company,Chengde 067000,China)

机构地区：[1]国网冀北电力有限公司承德供电公司

出　　处：《电器与能效管理技术》2019年第9期65-70,共6页Electrical & Energy Management Technology

摘　　要：电网电压跌落引起的双馈感应风电机组(DFIG)定子电压跌落,造成DFIG定子磁链振荡,从而引起定、转子产生较大的振荡电流。电网电压跌落到一定幅值时,DFIG定、转子过电流可能达到额定电流的3~4倍,对定、转子绕组,特别是双PWM变换器产生极大危害。超级电容储能具有高功率、高循环寿命等特点,可用于系统短时间的功率支撑,因此应用超级电容及双向DC/DC构建Crowbar保护电路释放磁场储能,加快磁链衰减,可以简单有效保护DFIG及其控制系统,限制定、转子过电流,提高DFIG的低电压穿越能力。针对风电机组低电压穿越能力的要求,通过仿真计算,验证了超级电容提高风电机组低电压穿越能力的有效性,提出了超级电容的容量配置方法及其控制策略,并进行了校验。The drop of grid voltage can cause the stator voltage of doubly-fed induction wind generator(DFIG) to drop rapidly,which can make the DFIG’s stator flux vibrate and cause a large oscillating current in DFIG’s rotor and stator side.When the grid’s voltage drops to certain amplitude,the DFIG rotor and stator side’s current could reach the 3~4 times of the rated current,which can produce a serious damage to the DFIG’s rotor and stator windings especially to the dual PWM converter.Super capacitor energy storage has the characteristics of high power and high cycle life,and can be used to support a short period of time’s power,so take use of the super capacitor and bi-directional DC/DC converter to build a crowbar protection circuit can release the magnetic energy storage rapidly which can protect DFIG and its control system,restrict the rotor and stator’s over-current,DC voltage and the oscillation of electromagnetic torque.So the super capacity system can improve the DFIG’s low voltage ride-through ability,and then realize the DFIG’s uninterrupted operation during the time of grid voltage drops.This paper,based on the requirement of wind turbines’ low voltage ride-through ability,verified the effectiveness of super capacitor to improve the wind turbines low voltage ride-through ability.And the super capacitor’s capacity allocation method was proposed,and super capacitor energy storage system’s control strategy was put forward,which were verified by the simulation.

关 键 词：双馈风电机组 低电压穿越 超级电容 容量配置 控制策略 

分 类 号：TM53[电气工程—电器]