摘要
光伏并网功率不断增加,其频率和电压主要由电网提供支撑,但对电网几乎不提供转动惯量。为提高光伏发电系统的稳定性,该文对基于虚拟同步发电机(VSG)的光储并网逆变器控制策略进行了研究。针对光伏发电系统和储能系统独立并入电网的结构特点,建立并网逆变器的VSG数学模型,设计基于一次调频和一次调压的并网有功、无功调节方案,建立VSG的小信号分析模型,对虚拟惯性和阻尼参数对并网功率跟踪的影响进行了分析。最后,在Matlab/Simulink平台上搭建仿真模型,验证VSG控制策略的正确性和有效性。仿真结果表明,该控制策略将惯性和阻尼引入功率控制环中,光储并网发电系统可模拟同步发电机实现一次调频和一次调压。
With the continuous increase of photovoltaic(PV)grid-connected power,its frequency and voltage are mainly supported by the power grid,but it provides almost no rotational inertia to the grid.In order to improve the stability of PV power generation systems,the control strategy of grid-connected inverter of the PV system with storage is studied based on virtual synchronous generator(VSG).The PV power generation system and energy storage system are integrated into the grid independently.The VSG mathematical model of a grid-connected inverter is built based on the characteristics of the system.The regulations of active and reactive powers are researched,respectively,based on primary frequency modulation and primary voltage modulation.A small-signal model of the VSG is established and the influence of different virtual inertia and damping parameters on power tracking of grid-connected inverters are discussed.Finally,a simulation model is built under the Matlab/Simulink platform to verify the correctness and effectiveness of the VSG control strategy.The results show that the control strategy can introduce the inertia and damping into the power control loop,and realize the primary frequency modulation and primary voltage regulation characteristics of the synchronous generator simulated by the PV system with storage.
作者
陈文倩
辛小南
程志平
Chen Wenqian;Xin Xiaonan;Cheng Zhiping(Industrial Technology Research Institute Zhengzhou University Zhengzhou 450001 China)
出处
《电工技术学报》
EI
CSCD
北大核心
2018年第A02期538-545,共8页
Transactions of China Electrotechnical Society
基金
国家自然科学基金青年科学基金项目(61803343)
河南省高等学校重点科研项目(18A470017
18A470015
17A120014
19A120012)
中国博士后科学基金面上项目(2018M630835)资助
关键词
虚拟同步发电机
并网逆变器
光储系统
虚拟惯性和阻尼
Virtual synchronous generator
grid-connected inverter
photovoltaic system with storage
virtual inertia and damping
