摘要
现代电力系统通常包含高压直流输电(HVDC)或灵活交流输电(FACTS)等由开关器件构成的高频元件,单一实时数字模型因其离散性而受仿真截止频率限制,无法准确模拟这类元件的高频响应过程,目前最有效的仿真措施是建立包含这类高频元件物理模型的数字-物理互联混合模型。根据电路替代定理提出节点电压重叠互联方法,即在数字模型中将接口点电压变量通过D/A转换输出通道形成物理模型中的电压源替代支路,又将该物理支路的电流变量通过A/D转换输入数字模型中形成接口支路的替代电流源,从而实现数字-物理模型的互联;从系统稳定性的角度对基于该方法互联的混合仿真模型进行了理论分析,证明混合仿真模型为有条件数值稳定系统且推导出模型的稳定条件判别式;最后,通过混合仿真实验验证了理论分析结果的正确性。
Modern power system includes commonly high frequency devices,such as HVDC or FACTS,which are composed of switching components. Pure digital model,limited by simulation cutoff frequency because of discretization, could not simulate accurately its high frequency responses. The most efficient way is to establish its digital- analog hybrid model. An interfacing method via node voltage overlap is presented based on circuit substitution theorem,of which the node voltage variable of the interfacing point in digital model is transmitted by D/A channel to form a voltage source branch at the interfacing point of analog model ,while its branch current variable is transmitted by A/D channel to form a current source branch at the interfacing point of digital model. The stability of the hybrid simulation model applying proposed interfacing method is discussed. It is proved that the hybrid model is a conditional numerical stable system, and the discriminant of model stabilization is deduced. The digital-analog model interfacing experiments verify its validity.
出处
《电力自动化设备》
EI
CSCD
北大核心
2008年第9期45-48,共4页
Electric Power Automation Equipment
关键词
数字模型
物理模型
互联
混合仿真
稳定性
digital model
analog model
interface
hybrid simulation
stability
