基于广域量测的交直流混联系统发生扰动后稳态频率预测算法

随着直流输电工程的广泛应用，交直流混联系统已经成为电网的发展趋势。针对含不同类型高压直流的交直流混联系统提出了其发生扰动后的稳态频率快速预测算法。该算法以广域量测系统得到的扰动后瞬间数据为基础，通过联立交流系统的发电机调速器方程、负荷静态模型方程、系统网络方程与不同类型高压直流系统的换流器稳态模型方程、直流网络方程、控制方程，得到了交直流混联系统的稳态频率预测方程。利用牛顿-拉夫逊法对该方程进行求解，可以快速、精确地计算得到电网发生扰动后的稳态频率。对一个典型的22节点交直流混联系统进行仿真分析，结果验证了所提算法的准确性和适用性。

Prediction algorithm of steady-state frequency after disturbance for hybrid AC/DC power system based on wide area measurement

With the extensive application of DC transmission project, the hybrid AC/DC power system has become the development trend of power grids. A fast prediction algorithm of steady-state frequency after disturbances is proposed for hybrid AC/DC power system with different types of HVDC(High Voltage Direct Current). Based on the instantaneous data after disturbances from wide area measurement system, the steady-state frequency prediction equation of the hybrid AC/DC power system is obtained from the simultaneous equations composed of the generator governor equation, the equation of load static model, the network equation of system and the steady-state model equation of converters, the DC network equation and the control equation of different types of HVDC system. The Newton-Raphson method is used to solve the simultaneous equation, and then the steady-state frequency after disturbances can be calculated accurately and quickly. A typical 22-bus hybrid AC/DC power system is simulated and analyzed, and results verify the accuracy and applicability of the proposed algorithm.