摘要
直流微电网的小惯性特点导致的负荷突变、新能源出力波动以及系统故障等扰动都会对系统直流电压的稳定造成严重影响。而交流系统中的虚拟同步发电机(virtual synchronous generator,VSG)控制能够使换流器为系统提供惯性支持,以减小交流系统频率的波动。因此基于VSG控制,根据交、直流系统间各变量的类比和对应关系,文章提出了一种应用于直流微电网的灵活虚拟惯性(flexible virtual inertia,FVI)控制策略,为受到扰动时的直流微网提供灵活可调的惯性支持,以减弱电压波动,改善电能质量。最后通过六端直流微网的实时仿真实验系统验证了所提控制策略的有效性。
Because the inertia of DC microgrid is small,disturbance of load,output power fluctuation of renewable energy and faults in system will seriously affect the stability of DC voltage. The virtual synchronous generator（ VSG）control in AC system can make the converter provide the inertia support for the system to reduce the frequency fluctuation in the AC system. A flexible virtual inertia（ FVI） control strategy for DC microgrid is proposed on the basis of virtual synchronous generator control,according to the analogy and correspondence relationship between the variables of AC and DC system,in order to supply adjustable inertia support for the DC microgrid,weaken the voltage fluctuation and improve the quality of voltage. Finally,the effectiveness of the proposed control strategy is verified by the real-time simulation experiment system of six-terminal DC microgrid.
作者
邹培根
孟建辉
王毅
王坚
ZOU Peigen;MENG Jianhui;WANG Yi;WANG Jian(State Key Laboratory of Alternate Electrical Power System With Renewable Energy Sources （North China Electric Power University）, Baoding 071003, Hebei Province, China)
出处
《电力建设》
北大核心
2018年第6期56-62,共7页
Electric Power Construction
基金
河北省自然科学基金项目(E2018502152)~~
