地电流注入磁控高抗的分相电磁暂态建模方法与动态激磁扰动特性研究

In extra/ultra high voltage alternative and directive current dense transmission system, when directive current transmission operated in monopole ground return mode, the earth current was generated to inject in magnetically controlled shunt reactor(MCSR), in which, the superposition of excitation in the magnetic circuit disturbed the operation of equipment and system stability. The project plans to research and analyze the problem based on the preliminary work. Firstly, explore the magnetic circuit coupling mechanism of earth current injection in magnetically controlled shunt reactor, analyzing the magnetization or demagnetization effects of reverse series directive excitation saturation magnetic circuit, and superimposed effect of alternative parallel unsaturated the magnetic circuit. Build the phase-separated electromagnetic transient time domain model for MCSR with the factor of alternative and directive mixed current injection in neutral point, by describing the nonlinear magnetization characteristics in continuous functions, taking into account the asymmetric dynamic excitation effect in the three-phase and nonlinear magnetic circuit characteristics. Reveal transient characteristics and the interaction effects generated by the fluctuation influence of disturbance in four cylinder three phase of MCSR in different operation mode considering earth current injection. Further, research the disturbance rule of MCSR reactive power output and the voltage stability generated by earth current injection, exploring the anti-disturbance control statics; revealing the current distortions, variation and relative factors, analyzing the disturbance in alternative and directive current transmission system by dynamic wide frequency harmonics. The result of project will provide the theoretical basis for earth current prevention, harmonics control and equipment improvement of MCSR, also give ideas for other magnetic device research.

超/特高压交直流紧密架设输电系统中，直流单极运行会使磁控高抗中性点注入地电流，在其磁路上叠加激磁扰动，影响设备运行和交流系统稳定。项目拟基于前期基础，首先探索地电流注入磁控高抗的电路磁路耦合机理，分析地电流注入对其反向串联的直流励磁饱和磁路的增磁/去磁效应和交流并联不饱和磁路的叠加效应，研究以连续函数描述非线性磁化特性，建立计及中性点交直流注入的三相不对称动态激磁效应和非线性磁路电路特性的分相电磁暂态时域模型；揭示地电流注入的波动性激磁扰动对不同运行状态下磁控高抗的四柱三相励磁磁路的交互性影响和暂态特性。进一步研究地电流注入的动态变化对磁控高抗无功容量输出以及电网电压稳定的扰动机理和规律，探索其抗扰动控制策略；揭示地电位电流注入磁控高抗的畸变特性、变化规律和相关因素，分析其动态广频谐波对交直流电网的扰动性。为磁控高抗的地电流防控、谐波治理和设备改进提供理论依据，为其他磁路设备研究提供思路。

超/特高压交直流紧密架设输电系统中，直流单极运行会使磁控高抗中性点注入地电流，在其磁路上叠加激磁扰动，影响设备运行和交流系统稳定。项目基于前期基础，首先探索地电流注入磁控高抗的电路磁路耦合机理，分析地电流注入对其反向串联的直流励磁饱和磁路的增磁/去磁效应和交流并联不饱和磁路的叠加效应，研究建立计及中性点交直流注入的三相不对称动态激磁效应和非线性磁路电路特性的分相电磁暂态时域模型，并在自主研发的ADPSS软件工程中实现并应用；探索了地电流注入的波动性激磁扰动对不同运行状态下磁控高抗的四柱三相励磁磁路的交互性影响和暂态特性、地电流注入的动态变化对磁控高抗无功容量输出以及电网电压稳定的扰动机理和规律。为磁控高抗的地电流防控、谐波治理和设备改进提供理论依据，为其他磁路设备研究提供思路。