基于特高压和超高压直流互联的送端电网AGC系统控制策略

采用基于特高压和超高压直流的电网异步联网方式对现有的自动发电控制(AGC)系统控制策略和电网频率控制的适应性问题逐步显现.为分析直流系统异步联网方式对电网AGC系统控制策略带来的影响,结合直流系统负荷的频率静态特性及其附加频率控制器的动态特性,分析了区域电网AGC对控制区设置、控制模式选择以及与直流附加频率控制器的适应性的影响,并对目前国内广泛应用的控制性能评价标准(CPS)控制策略适应性进行探讨.基于PSD-FDS平台进行直流系统与AGC的频率控制仿真验证和实际工程应用,结果表明基于特高压和超高压直流互联的送端电网AGC控制策略能够较好地适应异步互联电网,为异步联网方式下AGC系统控制策略制定和优化提供参考.

AGC system control strategy of sending power grid interconnected with UHVDC and EHVDC

The problem of adaptability of AGC(Automatic Generation Control) system control strategy and frequency control of power grid which adopts asynchronous interconnection mode with UHVDC and EHVDC gradually appears. In order to analyze the influence of asynchronous interconnection mode of DC system on AGC system control strategy, combined with static characteristics of load in DC system and dynamic characteristics of additional frequency controller, the influence of regional power grid AGC on the setting of control area, the selection of control modes and the adaptability of DC additional frequency controller are analyzed. At the same time, the adaptability of CPS(Control Performance Standard) control strategy which is widely used in China is discussed. Based on PSD-FDS platform, the simulation verification and engineering application of DC system and AGC frequency control are carried out. The simulative results show that AGC system control strategy of sending power grid interconnected with UHVDC and EHVDC can adapt to asynchronous interconnected power grids, and provide reference for the formulation and optimization of AGC system control strategy under asynchronous interconnection mode.