大容量调相机对省级电网的影响分析

随着交直流混联电网的发展，越来越多地采用大容量调相机为系统提供无功支撑，提高电网运行的安全稳定性。对大容量调相机在特高压直流受端电网的应用进行研究，将调相机与电网中其他无功设备协调优化。通过对电压-无功的稳态和动态相关性分析，确定调相机的周边机组和相应的局部电网。构建含大容量调相机的非线性无功优化模型，优化局部电网的无功裕度。依据优化变量的不同特性，对连续变量和离散变量交替计算。以河南电网为算例，考虑不同负荷水平和电网结构的典型运行方式，模拟省调AVC的运行性能，进行计算分析，说明所述算法的可行性和实用性。

Analysis of the influence of a large-capacity condenser on a provincial power grid

With the development of AC-DC hybrid power grids, more and more large capacity synchronous condensers are used to provide reactive power support for the system and improve the safety and stability of power grid operation. This paper studies the application of a large capacity condenser in a UHV DC receiving power grid, and optimizes the condenser in coordination with other reactive power equipment in the grid. Based on the analysis of the steady-state and dynamic correlation between voltage and reactive power, the peripheral units of the condenser and the corresponding local power grid are determined. Then, a non-linear reactive power optimization model with large-capacity synchronous condensers is constructed, and the reactive power margin of the local power grid is optimized. Given the different characteristics of optimization variables, the continuous variables and discrete variables are calculated alternately. This paper takes the Henan power grid as an example. Considering the typical operation mode of different load levels and grid structures, and simulating the operation performance of provincial dispatching AVC, the calculation and analysis for reactive power optimization are carried out. The feasibility and practicability of the proposal algorithm are explained. This work is supported by National Natural Science Foundation of China (No. 61473265).