电网电压不平衡下双馈发电机的直接谐振控制

Direct Resonance Control of Doubly-Fed Generator under Voltage Unbalance

提出直接谐振控制技术,解决双馈发电机因电网电压不平衡引起输出有功/无功功率、电磁转矩和定子电流中含有二倍频分量,导致双馈发电机不能稳定运行和输出电能质量降低的问题。首先分析电网电压不平衡对双馈发电机的影响,提出了基于谐振控制器的直接谐振控制方案,其次分析了直接谐振控制方案的控制性能,进行仿真研究。仿真研究表明,直接谐振控制技术可有效消除转子电流、输出功率和电磁转矩中的二倍频分量,验证了本控制方案的正确性和有效性,为工程实际应用提供参考。

In this paper, a direct resonance control scheme is proposed to solve the problem that due to the unbal- anced voltage of the doubly-fed generator, the doubled frequency components are included in the active/reactive pow- er, the electromagnetic torque and the stator current, resulting in the non-stable operation of the doubly-fed genera- tor and the reduction of the output power quality. In order to solve the above problems, this paper first analyzed the influence of the voltage unbalance of the doubly fed generator, and then put forward the direct control scheme based on resonant controller, followed by the analysis of control performance of direct resonant control scheme. The simula- tion was conducted. The simulation results show that the direct resonance control scheme can effectively eliminate the second harmonic component of the rotor current, the output power and the electromagnetic torque, which verifies the correctness and validity of the control scheme, and provides some reference for the practical application of the project.