摘要
电网电压不平衡条件下,为了最大限度提升双馈发电系统综合运行能力,需考虑网侧变换器的辅助控制功能。本文提出一种采用降阶谐振器的电流控制方案,可实现以消除整个双馈发电系统输出有功、无功功率脉动为目标的辅助控制功能。该控制方案以整个系统输出的有功、无功功率直接作为被控对象,在正转同步旋转坐标系中通过2倍频降阶谐振器对其进行直接调节,可消除以正、负序电压分量为基础的网侧变换器负序电流指令计算环节,并完全无需对电压、电流进行相序分离,即可实现所设定的网侧变换器辅助控制目标。仿真和实验结果表明:所提出采用降阶谐振器的电流控制方案,在电网电压不平衡条件下,既实现消除整个发电系统输出有功、无功功率的脉动的网侧变换器既定控制目标,又可提高双馈系统在不平衡故障下的动态控制性能。
In order to develop the operation performance of the overall DFIG generation system under unbalanced grid voltage conditions, the auxiliary control of the gird-side converter(GSC) must be taken into account. A current control scheme, using a reduced-order resonant controller(RORC), is proposed in this paper so as to achieve the selectable control targets, i. e., removing the oscillations in the active or reactive power. In this control strategy, the active(or reactive) power oscillations are directly to be controlled by RORCs in the synchronous reference frame. As a result, the reference calculations of the negative sequence currents and the sequential separations of the measured voltage are avoided. Simulation and experimental results are provided to demonstrate the availability of the proposed control strategy using RORCs.
出处
《电工技术学报》
EI
CSCD
北大核心
2015年第4期35-43,共9页
Transactions of China Electrotechnical Society
关键词
电压不平衡
双馈发电系统
降阶谐振调节器
网侧变换器
辅助控制
Grid unbalance,DFIG generation system,reduced-order resonant controller,grid-side converter,auxiliary control scheme
