摘要
文章提出一种改进型功率分层协调控制策略,该策略利用荷源功率差信号代替母线电压信号作为切换条件,使孤岛型光储直流微网系统能够在不同运行模式间平滑切换,从而实现微网内部功率的动态平衡,保证不同工况下均存在以电压特性运行的松弛终端给直流母线提供电压支撑。通过下垂控制实现并联型储能系统按照实时功率调节能力决定自身出力,有效避免储能系统的过充过放,并引入二次运行控制环节解决了储能单元功率分配超过最大充放电功率引起的系统失衡问题。最后通过Matlab/Simulink平台在不同工况下实现该策略,仿真结果验证了所提出控制策略的有效性与优越性。
An improved power hierarchical coordination control strategy is proposed for the isoland PV/storage hybrid DC microgrid, which uses the power signal difference between source and load to replace the voltage signal of bus as the mode switching condition, so that the system can switch smoothly between different operating modes,So as to realize the dynamic balance of power within the microgrid, and the slack terminal operating with voltage characteristic can provide voltage support for the DC bus under any working condition. Among them, droop control is used to realize the Parallel-connected energy storage system to determine its own output according to the real-time power regulation ability, effectively avoiding the over charge and over discharge of the energy storage system. And the second operation control link is introduced to solve the system imbalance problem caused by the power distribution of energy storage unit exceeding the maximum charge and discharge power. Finally, the strategy is implemented under different working conditions through the Matlab/Simulink platform, and the simulation results verify the effectiveness and superiority of the proposed control strategy.
作者
康家玉
史晨雨
王素娥
白一锴
Kang Jiayu;Shi Chenyu;Wang Sue;Bai Yikai(College of Electrical and Control Engineering,Shaanxi University of Science and Technology,Xi'an 710021,China)
出处
《可再生能源》
CAS
CSCD
北大核心
2022年第1期101-108,共8页
Renewable Energy Resources
基金
陕西省技术创新引导专项项目(2018XNCG-G-12)。
关键词
直流微网
功率分层
下垂控制
并联型储能系统
DC micro grid
power hierarchy
droop control
parallel-connected energy storage system
