文章摘要
朱晓荣,孟凡奇,谢志云.基于虚拟同步发电机的直流微网DC-DC变换器控制策略[J].电力系统自动化. DOI: 10.7500/AEPS20180730015.
ZHU Xiaorong,MENG Fanqi,XIE Zhiyun.Control Strategy of DC-DC Converter in DC Microgrid Based on Virtual Synchronous Generator[J].Automation of Electric Power Systems. DOI: 10.7500/AEPS20180730015.
基于虚拟同步发电机的直流微网DC-DC变换器控制策略
Control Strategy of DC-DC Converter in DC Microgrid Based on Virtual Synchronous Generator
DOI:10.7500/AEPS20180730015
关键词: 直流微电网  储能单元  类虚拟同步发电机  小信号模型
KeyWords: DC microgrid  energy storage unit  analogous virtual synchronous generator  small-signal model
上网日期:2019-06-11
基金项目:
作者单位E-mail
朱晓荣 新能源电力系统国家重点实验室华北电力大学保定 河北省 保定市 xiaorongzhu@ncepu.edu.cn 
孟凡奇 新能源电力系统国家重点实验室华北电力大学保定 河北省 保定市 401151097@qq.com 
谢志云 国网浙江省温州市供电公司 浙江省 温州市 zhiyun-cn@foxmail.com 
摘要:
      针对直流微电网惯性低,母线电压易受功率波动影响的问题,本文提出了一种直流微电网类虚拟同步发电机控制并将其应用到双向DC-DC变换器中,提高了直流微电网的惯性,抑制了直流母线电压波动。首先,通过类比交流微网中的虚拟同步发电机控制得到了适用于直流微网中的类虚拟同步发电机控制;其次,通过建立小信号模型,对所提控制策略进行了理论分析,并针对电压动态变化过程中初始阶段的大扰动,采用前馈补偿进行了修正;再次,分析了加入虚拟惯性后控制参数对稳定性的影响;最后,通过Matlab/Simulink仿真分析验证了上述理论分析和控制策略的有效性。
Abstract:
      In DC microgrids, the inherent inertia from DC capacitors is low, which makes the bus voltage susceptible to power fluctuations. In this paper, a method of analogous virtual synchronous generator control is proposed and applied in energy storage unit to strengthen the inertia of DC microgrid. The proposed method is analogized by the virtual synchronous generator control in AC microgrid to imitate the inertia and damping characteristic. And the small-signal model of the proposed strategy is built to explore the voltage dynamic characteristic and stability. In order to eliminate the disturbance in the beginning of voltage dynamic characteristic, a feedforward compensation is applied, and the dynamic characteristic of the bus voltage is revised. Then the influence of control parameters on stability is analyzed by the small-signal model of the revised strategy. Finally, the validity of the above theoretical analysis and control strategy is verified by simulations.
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