摘要
基于虚拟同步发电机(VSG)技术的储能变换器并网运行时,由于自身功率限制,容易出现电网频率波动时无法实现调频和恒功率控制,从而产生功率限额或功率偏差问题。在此提出一种适用于并网工况的虚拟同步储能变换器的恒功率控制及其运行模式切换策略。该控制策略使得储能变换器具备惯性和阻尼特性,且能实现无锁相环自同步并网恒功率运行。因此,该控制及模式切换策略对解决多储能变换器并网运行时系统频率扰动产生的动态环流和功率振荡问题具有参考意义。通过仿真和实验结果验证,所提控制及模式切换策略对于储能变换器的友好并网运行实用有效。
For grid-connected operation energy storage converter based on virtual synchronous generator(VSG) technology,power limitation or deviation problem is inevitable and constant power control cannot be realized due to its capacity limits of power converter when the grid frequency fluctuation appears.According to the problem,the constant power control strategy and its mode switching control strategy based on VSG is proposed.The energy storage converter based on the proposed control strategy can provide the inertia,damping,and can be self-synchronizing and need not phase-locked loop besides keeping constant power output.Therefore,the strategy proposed can give a reference significance to solve the dynamic circulation and power oscillation problem caused by the system frequency disturbance when the multi-VSG parallel system operating in grid-connected mode.Finally,both simulation and experimental platforms are established,and the results verify the effectiveness of the proposed strategies.Finally,the simulation and experimental results indicate that the proposed control and mode switching strategy for energy storage converter friendly grid-connected operation is practical and effective.
作者
杨春来
温春雪
臧梓丞
YANG Chun-lai;WEN Chun-xue;ZANG Zi-cheng(State Grid Hebei Electric Power Research Institute,Shijiazhuang 050021,China)
出处
《电力电子技术》
CSCD
北大核心
2020年第2期12-15,27,共5页
Power Electronics
基金
北京市高水平创新团队建设计划(IDHT201805-02)
河北省电力有限公司科技项目(SGTYHT/16-JS-198)。
关键词
储能变换器
虚拟同步
并网运行
模式切换
energy storage converter
virtual synchronous
grid-connected operation
mode switching
作者简介
杨春来(1987-),男,河北保定人,硕士,高级工程师,研究方向为综合能源网源协调和电力金触。
