对大规模交直流网络下的高压直流控制保护系统进行参数优化设计，是保证灵活交流输电系统暂态性和稳定性良好的重要手段。
The optimal design of HVDC control and protection parameters in the case of large-scale ac and DC power system network is a valid measure to ensure achieving good transient and stable performance.
从VDMOS的物理结构出发建立子电路模型，进而导出描述其交直流特性的参数及模型公式。
A sub circuit model for VDMOS is built according to its physical structure. Parameters and formulas describing the device are also derived from this model.
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