电网不平衡条件下DFIG的无差拍预测电流控制策略
Deadbeat Predictive Current Control Strategy of DFIG under Unbalanced Grid Conditions
朱成成 1王斌 1石瑛琪1
作者信息
- 1. 宁夏大学电子与电气工程学院,宁夏 银川 750021
- 折叠
摘要
传统矢量控制因其实现简单、稳定性好被用于双馈异步风力发电机(DFIG)的控制中.但是其参数整定过程过于依赖经验值,且在电网不平衡条件下受负序电流的影响,易引起发电机系统的转子过电流、过电压,及变换器直流侧母线电压波动大、电磁转矩振荡等问题.针对传统矢量控制的这些不利因素,提出了无差拍预测电流控制策略,推导了DFIG转子侧变换器电流环采用无差拍预测电流控制的数学模型,系统可以在一个周期内得到最优的电压矢量.最后,在MATLAB/Simulink软件平台中验证了无差拍预测电流控制在电网不平衡条件下的有效性.
Abstract
Classic vector control is widely used in the control of doubly-fed induction generators(DFIG)due to its simplicity and stability.However,the parameter tuning process of classic vector control heavily relies on empirical values and is adversely affected by negative sequence currents under unbalanced grid conditions.This can lead to issues such as rotor overcurrent and overvoltage in the generator system,significant fluctuations in the DC bus voltage of the converter,and oscillations in electromagnetic torque.To address these drawbacks of classic vector control,a deadbeat predictive current control strategy is proposed.The mathematical model for the current loop of the DFIG rotor-side converter using deadbeat predictive current control is derived,allowing the system to obtain the optimal voltage vector within one control cycle.Finally,the effectiveness of the deadbeat predictive current control in mitigating rotor overcurrent and overvoltage,large DC-side bus voltage fluctuations,and electromagnetic torque oscillations under grid unbalanced grid conditions is validated using the MATLAB/Simulink software platform.
关键词
双馈异步发电机/无差拍预测电流控制/传统矢量控制/转子侧变换器/电网电压不平衡跌落Key words
doubly-fed induction generators/deadbeat predictive current control/classic vector control/rotor-side con-verter/grid voltage unbalance dips引用本文复制引用
出版年
2024
国家科技期刊平台
NSTL
万方数据