摘要
针对实际应用中独立可靠稳定运行的静止同步补偿器(STATCOM)在规模化并联补偿时会出现谐振现象,建立了单个STATCOM的诺顿等效电路以及电网侧的戴维南等效电路,得出了较高的网侧阻抗是导致系统谐振的主要原因的结论;建立了多个STATCOM并联时的数学模型,推导了系统的闭环传递函数;利用所建立的数学模型分析了STATCOM数量、负载变化以及有源阻尼反馈系数对系统闭环频率特性的影响。最后,通过仿真证明了所提数学模型的有效性。
Resonant issue may be generated in a parallel-STATCOM-based weak grid system,while separately every single STATCOM can run smoothly and reliably. To address this issue,firstly,a Norton equivalent model of LCL-STATCOM and a Thevenin equivalent circuit of grid side were established,getting to the conclusion that it is the existence of grid impedance that gives rise to resonance. Then the math model of multi-LCL-STATCOM gridconnected system was built based on Norton equivalent model,correspondingly,the close-loop transfer function of the system was deduced. And the influence of the variation of load,the number of STATCOM in parallel and active damping parameter on the frequency response of the whole system was discussed based on the proposed model. At last,the correctness and effectiveness of the proposed model was validated through the simulation.
出处
《电器与能效管理技术》
2016年第20期6-14,共9页
Electrical & Energy Management Technology
