交直流并联系统交流母线电压稳定性评估的模型和算法

The Model and Algorithm for Voltage Stability Evaluation at AC/DC Interconnections in Hybrid AC/DC Systems

本文应用小信号原理,首次建立了交直流并联系统交流母线电压稳定性评估的数学模型,提出了相应的计算机解算方法。在模型中,还特别计及了各换流站间无功—电压调节效应的相互影响,因而该模型也可适用于多端高压直流系统。本文还对长江三峡交直流并联输电系统作了初步的探索性计算。

In this paper, the principle of small-signal is employed to establish the mathematical model and to present a computer algorithm for voltage stability evaluation at AC/DC interconnections in hybrid AC/DC systems. In the procedure of calculating reactive-voltage regulation effect, the general load flow and inverse Jacobian matrix calculations are avoided. The voltage stability criterion for the case of hybrid AC/DC systems is developed. The interactions between converter stations have been taken into account in the model, therefore, it is also applicable to multiterminal HVDC systems with any connection.It is expected that this model and the relevant algorithm have the advantages of flexibility and saving computer time. It is supported by an example in this paper, which is also used to illustrate the application of this method.