直流分布式电力系统变换器终端特性研究

Terminal characteristics study of converter for DC distributed power system

直流分布式电力系统在集成过程中存在一些典型问题:各变换器单独工作时稳定,集成后由于子系统间相互干扰导致集成系统不稳定;集成系统动态特性无法利用传统方法即电路的状态方程预测。针对此问题,从元件级出发,设计电压反馈控制型DC/DC变换器,采用间接的频域法设计相应补偿网络,改善并比较补偿前后变换器的终端特性。在Saber仿真平台下,利用可靠且先进的终端特性测量方法,实现终端特性的频域仿真测量;通过时域仿真验证变换器终端特性所反映的电源调整率、负载调整率以及该变换器作为源变换器级联恒功率负载时级联系统的稳定性。

For DC distributed power system（DC DPS）, there are some typical problems in the integration process：although each converter alone operating is stable, interaction between subsystems can lead integration system instable after integration; and integration system dynamics can＇t be predicted by traditional measures circuits＇ status equation. As to the problems above, starting from the element level, a voltage feedback control DC/DC converter was designed, and the correspondent compensating network was designed through indirect frequency domain method,improving and contrasting converter terminal characteristics before and after compensating. Under the Saber simulation platform, the frequency domain simulation measurement of terminal characteristics was carried on through advanced and dependable terminal characteristics measurement method; power regulation, load regulation reflected by converter terminal characteristics and the stability of cascading connection system when the converter as a source converter was cascadingly connected with constant power load were verified through time domain simulation.