微网柔性并网功率平抑控制策略研究

doi:10.16180/j.cnki.issn1007-7820.2022.11.012

摘要/Abstract

摘要：

微电网内分布式电源存在发电功率不稳定的问题,当微网与大电网并联运行时会对大电网系统的稳定性产生影响。为了消除微网内功率波动对大电网的影响,需对并网接口做出改进。文中提出了一种可平抑微网内功率波动的柔性并网接口,将配电网与微电网进行柔性互联。该接口以背靠背变流器为雏形,将混合储能技术运用在并网技术上,计算出微网内功率的波动量,再通过并网接口中的混合储能环节进行平抑,消除了微网功率波动对配网功率的影响,并简化了微网内微源的控制方式。利用MATLAB/Simulink仿真平台进行实验,验证了柔性并网接口可有效平抑微网功率波动的能力以及微网运行模式切换时并网接口可有效简化微网内控制方式的作用。

关键词: 柔性并网, 功率平抑, 混合储能, 直流电压随动控制, 电压稳定控制, 背靠背变流器, DC/DC变换器, MATLAB

Abstract:

Due to the instability of generation power of distributed generation in microgrid, when microgrid and large power grid operate in parallel, it will affect the stability of large power grid system. In order to eliminate the influence of power fluctuation in microgrid on large power grid, it is necessary to improve the grid connection interface. A flexible grid connection interface is proposed to stabilize the power fluctuation in microgrid and connect the distribution network and microgrid flexibly. The interface takes the back-to-back converter as the prototype, and applies the hybrid energy storage technology to the grid connection technology to calculate the power fluctuations in the microgrid. Then, the hybrid energy storage link in the grid-connected interface is used to smooth out the power fluctuations, which eliminates the impact of microgrid power fluctuations on the distribution network power and simplifies the control mode of the micro source in the microgrid. Experiments performed on MATLAB/Simulink simulation platform prove that the flexible grid-connected interface can suppress the power fluctuations of the microgrid, and the grid-connected interface can effectively simplify the control mode in the microgrid when the microgrid operating mode is switched.

Key words: flexible grid connection, power flattening, hybrid energy storage, DC voltage follow-up control, voltage stability control, back-to-back converter, DC/DC converter, MATLAB

中图分类号:

TN99

张文静,陈卓,刘柏霖,朱家文,黄丽苏. 微网柔性并网功率平抑控制策略研究[J]. 电子科技, 2022, 35(11): 80-89.

ZHANG Wenjing,CHEN Zhuo,LIU Bolin,ZHU Jiawen,HUANG Lisu. Study on Fluctuation Smoothing Strategy of Flexible Grid-Connection of Microgrid[J]. Electronic Science and Technology, 2022, 35(11): 80-89.

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