多馈入直流输电系统充裕度评估的模型和方法

建立了多馈入直流系统充裕度评估的容量模型,该模型将直流系统分为阀组、极、双极3个子系统,通过串联和并联的形式将这3个子系统组合成整个直流系统,将合成的直流系统与发电系统串联形成单馈入直流系统,将各单馈入直流系统并联组成多馈入直流系统.文中提出了子系统串联和并联连接时容量模型的等效方法,并基于多馈入直流系统的容量模型计算了充裕度指标,算例分析结果表明文中提出的模型和方法是合理的,对多馈入直流系统的充裕度评估有一定的指导意义.

ADEQUACY EVALUATION MODEL AND METHOD FOR MULTI-INFEED DC POWER TRANSMISSION SYSTEMS

The authors establish a capacity model to evaluate the adequacy of multi-infeed DC (MIDC) power transmission system, in which the DC system is divided into three subsystems, i.e., valve group subsystem, single-pole subsystem and bi-pole subsystem. By means of parallel and series connections these three subsystems are combined into whole DC system. Connecting the power generating system with the combined DC system in series a mono-infeed DC system is formed, then connecting all of the mono-infeed DC systems in parallel an MIDC system is constituted. Here, an equivalent method of capacity model is proposed while the subsystems are connected in series and parallel, then the adequacy index is calculated based on the capacity model of MIDC system. The results from numerical examples and analysis show that the proposed model and method are reasonable and they may play directive role to certain extent in the adequacy evaluation of MIDC.