基于下垂并网的双馈风力发电机谐波电压抑制策略  

Harmonic-voltage Suppress Strategy of Doubly-fed Induction Generators Based on Voltage Source Droop Grid-connected Output

作　　者：谢震[1] 李梦杰 张兴[1] 杨淑英[1] XIE Zhen;LI Mengjie;ZHANG Xing;YANG Shuying(School of Electrical Engineering and Automation,Hefei University of Technology,Hefei 230009,Anhui Province,China)

机构地区：[1]合肥工业大学电气与自动化工程学院

出　　处：《中国电机工程学报》2018年第17期5228-5237,共10页Proceedings of the CSEE

基　　金：国家自然科学基金项目(51277050);国家电网公司科技项目(NYB17201700151)~~

摘　　要：在双馈感应发电机（doubly-fed induction generator,DFIG）基于电压源输出并入弱电网的条件下,针对系统中含有非线性负载的情况,提出一种改善公共连接点（point of common coupling,PCC）谐波电压的方法。首先建立双馈发电机基于电压源下垂并网输出的功率小信号模型。然后根据模型建立谐波源到输出电压的传递函数。以抑制并网点电压的5次和7次谐波为目标,在转子电流内环采用比例积分控制器的基础上,利用准谐振调节器直接提取并网点电压的谐波分量,引入比例前馈补偿,有效降低并网点谐波电压含量和输出功率脉动。最后通过实验验证所提控制策略的有效性。For the conditions, in which the doubly-fed induction generator（DFIG） is working as the voltage source and is connected to the weak grid, this paper proposed a harmonic-voltage suppress strategy to improve the output voltage in the point of common coupling（PCC） when nonlinear loads worked in the system. Firstly, this paper established a small signal model of DFIG based on the voltage source droop grid-connected output mode. And the transfer function of the harmonic source to output voltages was established according to the model. Then, in order to suppress the 5 th and 7 th harmonic voltage components at the stator side, a similar resonant regulator was used to obtain the harmonic component directly. And on the biases of traditional PI control in the rotor side convertor（RSC）,this paper adopted a harmonic voltage proportional feedforward strategy to realize the harmonic-voltage suppress. Finally, the theoretical analysis and experimental results verified that the DFIG with nonlinear loads can achieve good performances of output voltages and output power ripples using the proposed control strategy.

关 键 词：电压源下垂输出 双馈感应发电机 非线性负载 小信号模型 谐波电压抑制 比例前馈 

分 类 号：TM315[电气工程—电机]