基于DIgSILENT的光储联合系统作为地区电网黑启动电源可行性研究

A Feasibility Study on Black Start Strategy for the Regional Power Grid with PV-BESS Based on DIgSILENT

为提高光多水少,甚至无水电地区电网的黑启动能力,该文提出了一种以光伏电站配置大容量电池储能系统作为黑启动电源的方案。首先,基于DIgSILENT/PowerFactory电力系统仿真平台,搭建光伏发电系统。为了维持其直流母线电压稳定和最大化光资源利用率,光伏逆变器采用电压/无功外环电流内环控制,Boost变换器采用MPPT控制。其次,在光伏发电系统的送端交流母线处配置储能,形成光储联合系统(photovoltaic-battery energy storage systems,PV-BESS)。储能部分DC/AC变换器采用V/f控制,以维持系统电压及频率的稳定。最后,考虑不同太阳辐照度、不同温度以及不同光储容量配比等情况,对输电线路空载充电以及启动大容量火电厂辅机的暂态过程进行仿真,验证了所提方案的可行性。

To improve the black-start ability of the power grid in areas with more light and less water,or even no hydropower,this paper proposes a scheme of using a photovoltaic power station to configure a large-capacity battery energy storage system as a black-start power source.First,a photovoltaic power generation system is built based on the DIgSILENT/PowerFactory power system simulation platform.To maintain the stability of its DC bus voltage and maximize the utilization of light resources,the photovoltaic inverter adopts voltage/reactive power outer loop current inner loop control,and the Boost converter adopts MPPT control.Second,the energy storage is configured at the sending end AC bus of the photovoltaic power generation system to form a photovoltaicbattery energy storage system(PV-BESS).The DC/AC converter of the energy storage part adopts V/f control to maintain the stability of the system voltage and frequency.Finally,considering the conditions of different solar irradiance,different temperatures,and different photovoltaic and storage capacity ratios,the transient process of the no-load charging of the transmission line and the start-up of the auxiliary equipment of the large-capacity thermal power plant is simulated to verify the feasibility of the proposed scheme.