摘要
电力电子装置在电力系统中得到广泛应用,忽略这类快速控制器件内部动态特性的准稳态模型在进行动态分析时缺乏准确性,而基于时域模型的电磁暂态仿真的仿真规模又受到限制。本文引入动态相量法,用来建立电力电子变换器的非线性、大信号、时不变的模型。仿真结果表明,动态相量模型比传统的稳态相量模型精确,非常接近于时域模型的结果,适合于快速数值仿真。
The power electronic devices are difficult to model due to their switching behavior. Conventional quasi-static models in electric-mechanical transient analysis do not adequately reflect the dynamic behavior of the switching. For electro-magnetic transient analysis, time-domain models can offer improved accuracy, but their nonlinear time-varying nature is impractical for large power system analysis. This paper introduces the dynamic phasors which produce nonlinear,time-invariant and large-signal model of a kind of converters. The models built with dynamic phasors are developed from time-domain descriptions using time-varying Fourier coefficients of interest and tracking the envelope of the actual waveforms. The simulation results demonstrate that the dynamic phasors model achieves a very good accuracy compared with detailed time-domain model, so it is well suited for faster transient simulation. This dynamical phasor model can be viewed as an intermediate between detailed time-domain representation and the quasi-static sinusoidal steady-state approximation, and it incorporates both advantages.
出处
《电工电能新技术》
CSCD
2004年第3期51-54,共4页
Advanced Technology of Electrical Engineering and Energy
基金
国家自然科学基金资助项目(50337010)
